What type of refrigerant should I use for the PURY-HP72 system?

The PURY-HP72 uses R410A refrigerant exclusively. Do not use any other refrigerant type, as using the wrong refrigerant may cause the unit or pipes to burst, or result in explosion or fire. The system is designed specifically for R410A, which is a pseudo-azeotropic HFC blend. (Page 3)

How long should I wait before turning off the power after stopping operation?

Leave the unit turned on for at least 5 minutes after stopping operation before turning off the power. This prevents water leakage and malfunctions that could occur if power is turned off immediately. (Page 3)

What piping materials should be used for R410A refrigerant systems?

Use refrigerant pipes made of phosphorus deoxidized copper with specific radial thickness ratings depending on the pipe diameter. For pipes smaller than ø19.05 (3/4"), use 1/2H-material (Drawn) pipes unless the radial thickness is at least 1.2t. Keep the inner and outer surfaces clean and free of contaminants such as sulfur, oxides, dust, dirt, shaving particles, oil, and water. (Page 5)

How should refrigerant be charged into the system?

Refrigerant must be charged in the liquid state, not the gaseous state. If gaseous refrigerant is drawn out first, the composition of the remaining refrigerant will change and become unsuitable for use. When using a cylinder with a siphon, refrigerant is charged in the liquid state without needing to turn it upside down. (Page 14)

What is the required vacuum level for the system before refrigerant charging?

Use a vacuum pump that attains 0.5 Torr (65 Pa) or lower degree of vacuum after 5 minutes of operation. After the degree of vacuum has reached 5 Torr (650 Pa), evacuate for an additional 1 hour. Verify that the vacuum degree has not risen by more than 1 Torr (130 Pa) one hour after evacuation. (Page 12)

What should be done if a leak detector cannot detect R410A refrigerant?

Procure a leak detector that is specifically designed to detect an HFC leak. A leak detector for R22 will not detect an HFC (R410A) leak because R410A does not contain chloride like R22 does. Using the wrong type of leak detector may fail to identify refrigerant leaks in the system. (Page 23)

What does Error Code 2502 indicate on the PURY-HP72 and where can I find the troubleshooting steps?

Error Code 2502 falls within the 2000-2999 range of error codes covered in Chapter 7 of the service manual. Definitions and solutions for codes in this range are detailed in section 7-4, Error Code Definitions and Solutions: Codes [2000 - 2999]. Refer to that section for the specific cause and corrective action for this error. (Page 184)

How long before starting operation should I turn on the power to the PURY-HP72?

Turn on the power at least 12 hours before starting operation. The power should remain on throughout the entire operating season to reduce the risk of malfunction. (Page 7)

What type of refrigerant is used in the PURY-HP72 and can I substitute another refrigerant?

The CITY MULTI H2i R2 series uses R410A refrigerant exclusively. You must not use any other refrigerant, as doing so may cause the unit or pipes to burst, result in explosion or fire, or cause the refrigerant oil to deteriorate and damage the compressor. Mitsubishi Electric cannot be held responsible for malfunctions or accidents resulting from the use of the wrong refrigerant. (Page 2)

How many indoor units can be connected to the PURY-HP72 outdoor unit?

The PURY-HP72 (capacity index 72) can connect a maximum of 18 indoor units. The maximum total capacity of connectable indoor units ranges from 36 to 108, and compatible indoor unit models are P06 through P96 from the R410A series. (Page 19)

What is the correct vacuum level required during vacuum drying, and how long must I evacuate the system?

Use a vacuum pump that attains 0.5 Torr (65 Pa) or lower after 5 minutes of operation. After the vacuum degree reaches 5 Torr (650 Pa), evacuate for an additional 1 hour, then verify that the vacuum degree has not risen by more than 1 Torr (130 Pa) after that hour. If 5 Torr (650 Pa) cannot be reached after 3 hours, water penetration or a leak is likely. (Page 12)

How should refrigerant R410A be charged into the system — in liquid or gas form?

R410A must always be charged in the liquid state. If refrigerant is drawn out in the gaseous phase, the composition of the remaining refrigerant in the cylinder will change and become unsuitable for use. Do not use a charging cylinder, as this will also alter the refrigerant composition and compromise unit performance. (Page 14)

What safety precautions must be taken when touching electrical components after the unit is stopped?

Always wear protective gear when working on electrical components, as residual voltage may still cause electric shock several minutes after power is switched off. Do not touch any electrical parts with bare hands during or immediately after stopping operation, as there is a risk of burns. (Page 3)

What should I do if a refrigerant leak occurs — do I need to replace all the refrigerant?

If refrigerant leaks out, it may be replenished without replacing the entire refrigerant charge. Charge the replacement refrigerant in the liquid state. For detailed procedures, refer to section 8-14, Measures for Refrigerant Leakage, on page 311 of the service manual. (Page 14)

Mitsubishi PURY-HP72 Heat Pump — Manual, FAQ & Troubleshooting

Name: Mitsubishi PURY-HP72 Heat Pump
Brand: Mitsubishi

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i Safety Precautions Please read the following safety precautions carefully before installing the unit to ensure safety. Make sure that this manual is passed on to the end user to retain for future reference. Retain this manual for future reference. When the unit is reinstalled or repaired, have this manual available to those who pro- vide these services. Make sure that this manual is passed on to any future users. All electric work must be performed by qualified personnel. Air tightness test must be performed by qualified personnel. [1] General Precautions Indicates a risk of death or serious injury. Indicates a risk of serious injury or structural damage. General Precautions Do not use refrigerant other than the type in- dicated in the manuals provided with the unit and on the nameplate. Doing so may cause the unit or pipes to burst, or result in explosion or fire during use, during repair, or at the time of disposal of the unit. It may also be in violation of applicable laws. MIT- SUBISHI ELECTRIC CORPORATION cannot be held responsible for malfunctions or ac- cidents resulting from the use of the wrong type of refrigerant. Do not install the unit in a place where large amounts of oil, steam, organic solvents, or corrosive gases, such as sulfuric gas, are present or where acidic/alkaline solutions or sprays containing sulfur are used fre- quently. These substances can compro- mise the performance of the unit or cause certain components of the unit to corrode, which can result in refrigerant leakage, wa- ter leakage, injury, electric shock, malfunc- tions, smoke, or fire. Do not try to defeat the safety features of the unit or make unauthorized setting changes. Forcing the unit to operate the unit by de- feating the safety features of the devices such as the pressure switch or the tempera- ture switch, making unauthorized changes to the switch settings, or using accessories other than the ones recommended by Mit- subishi Electric may result in smoke, fire, or explosion. To reduce the risk of shorting, current leak- age, electric shock, malfunctions, smoke, or fire, do not splash water on electric parts. To reduce the risk of electric shock, mal- functions, smoke or fire, do not operate the switches/buttons or touch other electrical parts with wet hands. To reduce the risk of pipe burst and explo- sion, do not allow gas refrigerant and refrig- erant oil to be trapped in the refrigerant circuit. To reduce the risk of burns or frost bites, do not touch the refrigerant pipes or refrigerant circuit components with bare hands during and immediately after operation. To reduce the risk of burns, do not touch any electrical parts with bare hands during or immediately after stopping operation. To reduce the risk of injury from falling tools, keep children away while installing, inspecting, or repairing the unit. Keep the space well ventilated. Refrigerant can displace air and cause oxygen starva- tion. If leaked refrigerant comes in contact with a heat source, toxic gas may be gener- ated.

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ii [2] Transportation and Installation Always replace a fuse with one with the cor- rect current rating. The use of improperly rated fuses or a substitution of fuses with steel or copper wire may result in bursting, fire or explosion. To reduce the risk of electric shock, smoke, and fire due to infiltration of dust and water, properly install all required covers. To reduce the risk of electric shock, smoke, and fire due to infiltration of dust and water, properly install all required terminal block covers and insulation sheets. To reduce the risk of electric shock, smoke, and fire due to infiltration of dust and water, properly install all required covers and pan- els on the terminal box and control box. To reduce the risk of injury from units falling or falling over, periodically check the instal- lation base for damage. Consult an authorized agency for the proper disposal of the unit. Refrigerant oil and re- frigerant that may be left in the unit pose a risk of fire, explosion, or environmental pol- lution. To reduce the risk of fire or explosion, do not place flammable materials or use flam- mable sprays around the unit. To reduce the risk of being caught in rotat- ing parts, electric shock, and burns, do not operate the unit without all required panels and guards being installed. To reduce the risk of injury, do not sit, stand, or place objects on the unit. The unit described in this manual is not in- tended for use with food, animals, plants, precision instruments, or art work. To reduce the risk of water leakage and mal- functions, do not turn off the power immedi- ately after stopping operation. Leave the unit turned on for at least 5 minutes before turning off the power. Do not install the unit over things that are vulnerable to water damage from condensa- tion dripping. To reduce the risk of injury, electric shock, and malfunctions, do not touch or allow ca- bles to come in contact with the edges of components. To reduce the risk of injury, do not touch the heat exchanger fins or sharp edges of com- ponents with bare hands. Always wear protective gears when touch- ing electrical components on the unit. Sev- eral minutes after the power is switched off, residual voltage may still cause electric shock. To reduce the risk of electric shock and burns, always wear protective gear when working on units. To reduce the risk of injury, do not insert fin- gers or foreign objects into air inlet/outlet grills. If the unit is left on a damaged base, it may fall and cause injury. To reduce the risk of injury, always wear protective gear when working on units. Do not release refrigerant into the atmo- sphere. Collect and reuse the refrigerant, or have it properly disposed of by an autho- rized agency. Refrigerant poses environ- mental hazards if released into the air. Transportation and Installation Lift the unit by placing the slings at desig- nated locations. Support the outdoor unit securely at four points to keep it from slip- ping and sliding. If the unit is not properly supported, it may fall and cause personal injury.

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iii [3] Installation To reduce the risk of injury, do not carry the product by the PP bands that are used on some packages. To reduce the risk of injury, products weigh- ing 20 kg or more should be carried by two or more people. Installation Do not install the unit where there is a risk of leaking flammable gas. If flammable gas accumulates around the unit, it may ignite and cause a fire or explo- sion. To reduce the risk of injury from coming in contact with units, install units where they are not accessible to people other than maintenance personnel. To reduce the risk of injury, properly dis- pose of the packing materials so that chil- dren will not play with them. Properly dispose of the packing materials. Plastic bags pose suffocation hazard to children. All drainage work should be performed by the dealer or qualified personnel according to the instructions detailed in the Installa- tion Manual. Improper drainage work may cause water leakage and resultant damage to the furnishings. Remove packing materials from the unit be- fore operating the unit. Note that some ac- cessories may be taped to the unit. Properly install all accessories that are required. Fail- ing to remove the packing materials or fail- ing to install required accessories may result in refrigerant leakage, oxygen depri- vation, smoke, or fire. Consult your dealer and take appropriate measures to safeguard against refrigerant leakage and resultant oxygen starvation. An installation of a refrigerant gas detector is recommended. Any additional parts must be installed by the dealer or qualified personnel. Only use the parts specified by Mitsubishi Electric. Installation by unauthorized personnel or use of unauthorized parts or accessories may result in water leakage, electric shock, or fire. Take appropriate safety measures against wind gusts and earthquakes to prevent the unit from toppling over and causing injury. To reduce the risk of injury from units falling or falling over, install the unit on a surface that is strong enough to support its weight. To reduce the risk of injury from units falling or falling over, periodically check the instal- lation base for damage. Do not install the unit over things that are vulnerable to water damage. Provide an ad- equate collective drainage system for the drain water from unit as necessary. Do not install the unit over things that are vulnerable to water damage. When the in- door humidity exceeds 80% or if the drain water outlet becomes clogged, condensa- tion may drip from the indoor unit onto the ceiling or floor. To reduce the risk of damage to the unit and resultant electric leak and electric shock, keep small animals, snow, and rain water from entering the unit by closing the gap in the pipe and wire access holes. To reduce the risk of rain water or drain wa- ter from entering the room and damaging the interior, drainage work must be per- formed by your dealer or qualified person- nel according to the instructions detailed in the Installation Manual.

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iv [4] Piping Work [5] Wiring Work To reduce the risk of drain water overflow, install the unit horizontally, using a level. Piping Work To reduce the risk of injury, including frost bites, that may result from being blasted with refrigerant, use caution when operat- ing the refrigerant service valve. If refriger- ant leaks out and comes in contact with an open flame, toxic gases may be generated. To reduce the risk of refrigerant catching fire and causing burns, remove the refriger- ant gas and the residual refrigerant oil in the pipes before heating them. To reduce the risk of pipe damage, refriger- ant leakage, and oxygen deprivation, use pipes that meet the pipe thickness specifi- cations, which vary by the type of refriger- ant used, pipe diameter, and pipe material. To reduce the risk of pipe burst or explo- sion, evacuate the refrigerant circuit using a vacuum pump, and do not purge the system with refrigerant. To reduce the risk of explosion and deterio- ration of refrigerant oil caused by chloride, do not use oxygen, flammable gas, or refrig- erant that contains chloride as a pressuriz- ing gas. To prevent explosion, do not heat the unit with refrigerant gas in the refrigerant circuit. To reduce the risk of refrigerant leakage and resultant oxygen deprivation, use the flare nut with holes that is supplied with the re- frigerant service valve. To reduce the risk of refrigerant leakage and resultant oxygen deprivation, use the flare nut that is supplied with the unit or its equiv- alent that meets applicable standards. To reduce the risk of damage to the unit, and resultant refrigerant leakage and oxy- gen deprivation, tighten flare nuts to a spec- ified torque. To reduce the risk of oxygen deprivation and gas poisoning, check for gas leakage and keep fire sources away. Insulate pipe connections after completing the air tightness test. Performing an air tightness test with the pipe being insulated may lead to failure to detect refrigerant leak- age and cause oxygen deprivation. To reduce the risk of pipe damage and re- sultant refrigerant leakage and oxygen de- privation, keep the field-installed pipes out of contact with the edges of components. To reduce the risk of pipe bursting and ex- plosion due to abnormal pressure rise, do not allow any substances other than R410A (such as air) to enter the refrigerant circuit. To reduce the risk of water leakage and re- sultant damage to the furnishings, drain piping work must be performed by your dealer or qualified personnel according to the instructions detailed in the Installation Manual. To keep the ceiling and floor from getting wet due to condensation, properly insulate the pipes. Wiring Work To reduce the risk of wire breakage, over- heating, smoke, and fire, keep undue force from being applied to the wires. To reduce the risk of wire breakage, over- heating, smoke, or fire, properly secure the cables in place and provide adequate slack in the cables so as not to stress the termi- nals.

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v [6] Relocation and Repairs [7] Additional Precautions To reduce the risk of injury or electric shock, switch off the main power before performing electrical work. All electric work must be performed by a qualified electrician according to the local regulations, standards, and the instructions detailed in the Installation Manual. Capacity shortage to the power supply circuit or im- proper installation may result in malfunc- tion, electric shock, smoke, or fire. To reduce the risk of electric shock, smoke, or fire, install an earth leakage breaker on the power supply to each unit. To reduce the risk of electric shock, smoke, or fire, install an inverter circuit breaker on the power supply to each unit. (Applicable to inverter units only) Use properly rated breakers and fuses (earth leakage breaker, local switch , no-fuse breaker). The use of a breaker with a breaking capacity greater than the specified capacity may cause elec- tric shock, malfunctions, smoke, or fire. Use properly rated breakers and fuses (in- verter circuit breaker, local switch , no-fuse breaker). The use of a break- er with a breaking capacity greater than the specified capacity may cause electric shock, malfunctions, smoke, or fire. (Appli- cable to inverter units only) To reduce the risk of current leakage, over- heating, smoke, or fire, use properly rated cables with adequate current carrying ca- pacity. Proper grounding must be provided by a li- censed electrician. Do not connect the grounding wire to a gas pipe, water pipe, lightning rod, or telephone wire. Improper grounding may result in electric shock, smoke, fire, or malfunction due to electrical noise interference. To reduce the risk of current leakage, wire breakage, smoke, or fire, keep the wiring out of contact with the refrigerant pipes and other parts, especially sharp edges. Relocation and Repairs To reduce the risk of refrigerant leakage, water leakage, injury, electric shock, and fire, units should only be moved or repaired by your dealer or qualified personnel. To reduce the risk of wire shorting, electric leak, electric shock, smoke, or fire, do not perform maintenance work in the rain. To reduce the risk of injury, electric shock, and fire, properly reinstall all removed com- ponents after completing repair work. To reduce the risk of wire shorting, electric shock, malfunctions, or fire, keep circuit boards dust free, and do not touch them with your hands or tools. To reduce the risk of refrigerant and water leakage, check the pipe supports and insu- lation for damage during inspection or re- pair, and replace or repair the ones that are found to be deteriorated. Additional Precautions To avoid damage to the unit, use appropri- ate tools to install, inspect, or repair the unit.

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vi To reduce the risk or malfunction, turn on the power at least 12 hours before starting operation, and leave the power turned on throughout the operating season. Recover all refrigerant in the units, and dis- pose of it properly according to any applica- ble laws and regulations. To reduce the risk of deterioration of refrig- erant oil and compressor malfunctions caused by a refrigerant that contains chlo- ride, such as R22, only use R410A. Provide a maintenance access to allow for the inspection of pipes above the ceiling or the buried pipes. Take appropriate measures against electri- cal noise interference when installing the air conditioners in hospitals or facilities with radio communication capabilities. Inverter, high-frequency medical, or wireless com- munication equipment as well as power generators may cause the air conditioning system to malfunction. Air conditioning system may also adversely affect the opera- tion of these types of equipment by creating electrical noise. To reduce the risk of damage to the unit, leave the valves on the unit closed until re- frigerant charging is completed. Place a wet towel on the refrigerant service valve before brazing the pipes to keep its temperature from rising above 120ºC and damaging the surrounding equipment. Direct the blazing torch flame away from the adjacent cables and sheet metal to keep them from being overheated and damaged. Prepare tools for exclusive use with R410A. Do not use the following tools if they have been used with the conventional refrigerant (R22): gauge manifold, charging hose, re- frigerant leak detector, check valve, refrig- erant charge spout, vacuum gauge, and refrigerant recovery equipment. R410A does not contain chloride, so leak detectors for use with older types of refrigerants will not detect an R410A leak. Infiltration of the residual refrigerant, refrigerant oil, or water on these tools may cause the refrigerant oil in the new system to deteriorate or damage the compressor. To reduce the risk of the vacuum pump oil backflowing into the refrigerant cycle and causing the refrigerant oil to deteriorate, use a vacuum pump with a check valve. Have a set of tools for exclusive use with R410A. Consult your nearest Mitsubishi Electric Dealer. Keep dust, dirt, and water off charging hose and flare tool. Infiltration of dust, dirt, or wa- ter into the refrigerant circuit may cause the refrigerant oil to deteriorate or damage the compressor. Use refrigerant piping and couplings that meet the applicable standards. For refriger- ant pipes, use pipes made of phosphorus deoxidized copper. Keep the inner and out- er surfaces of pipes and couplings clean and free of such contaminants as sulfur, ox- ides, dust, dirt, shaving particles, oil, and moisture. Failure to follow these directions may result in the deterioration of refrigerant oil or compressor damage. Store the piping materials indoors, and keep both ends of the pipes sealed until im- mediately before brazing. Keep elbows and other joints in plastic bags. Infiltration of dust, dirt, or water into the refrigerant cir- cuit may cause the refrigerant oil to deterio- rate or damage the compressor. Apply ester oil, ether oil, or a small amount of alkyl benzene to flares and flanges. The use and accidental infiltration of mineral oil into the system may cause the refrigerant oil to deteriorate or damage the compres- sor. To reduce the risk of oxidized film from en- tering the refrigerant pipe and causing the refrigerant oil to deteriorate or damaging the compressor, braze pipes under nitrogen purge. Do not use the existing refrigerant piping. A large amount of chloride that is contained in the residual refrigerant and refrigerant oil in the existing piping may cause the refriger- ant oil in the new unit to deteriorate or dam- age the compressor. Charge refrigerant in the liquid state. If re- frigerant is charged in the gas phase, the composition of the refrigerant in the cylin- der will change, compromising the unit's performance.

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Chapter 1 Check Before Servicing 1-1 Preparation for Piping Work.................................................................................................................. 3 1-2 Handling and Characteristics of Piping Materials, Refrigerant, and Refrigerant Oil ....................... 5 1-3 Working with Refrigerant Piping......................................................................................................... 10 1-4 Precautions for Wiring......................................................................................................................... 15 Chapter 2 Restrictions 2-1 System Configurations ........................................................................................................................ 19 2-2 Types and Maximum Allowable Length of Cables ............................................................................ 20 2-3 Switch Settings..................................................................................................................................... 21 2-4 M-NET Address Settings ..................................................................................................................... 22 2-5 Demand Control Overview .................................................................................................................. 29 2-6 System Connection Example .............................................................................................................. 30 2-7 Example System with an MA Remote Controller .............................................................................. 32 2-8 Example System with an ME Remote Controller............................................................................... 46 2-9 Example System with an MA and an ME Remote Controller............................................................ 48 2-10 Restrictions on Refrigerant Pipes ...................................................................................................... 51 Chapter 3 Major Components, Their Functions and Refrigerant Circuits 3-1 External Appearance and Refrigerant Circuit Components of Outdoor Unit ................................. 65 3-2 Outdoor Unit Refrigerant Circuit Diagrams ....................................................................................... 67 3-3 Functions of the Major Components of Outdoor Unit ...................................................................... 69 3-4 Functions of the Major Components of Indoor Unit ......................................................................... 72 3-5 External Appearance and Refrigerant Circuit Components of BC Controller................................ 73 3-6 BC Controller Refrigerant Circuit Diagrams ...................................................................................... 76 3-7 Functions of the Major Components of BC Controller ..................................................................... 79 Chapter 4 Electrical Components and Wiring Diagrams 4-1 Outdoor Unit Circuit Board Arrangement .......................................................................................... 87 4-2 Outdoor Unit Circuit Board Components .......................................................................................... 90 4-3 Outdoor Unit Electrical Wiring Diagrams........................................................................................... 98 4-4 Transmission Booster Electrical Wiring Diagrams......................................................................... 100 4-5 BC Controller Circuit Board Arrangement....................................................................................... 101 4-6 BC Controller Circuit Board Components ....................................................................................... 102 4-7 BC Controller Electrical Wiring Diagrams ....................................................................................... 104 Chapter 5 Control 5-1 Dipswitch Functions and Factory Settings...................................................................................... 117 5-2 Outdoor Unit Control ......................................................................................................................... 124 5-3 BC Controller Control ........................................................................................................................ 139 5-4 Operation Flowcharts ........................................................................................................................ 140 Chapter 6 Test Run 6-1 Read before Test Run ........................................................................................................................ 149 6-2 MA and ME Remote Controller Functions and Specifications....................................................... 150 6-3 Making the Group and Interlock Settings from an ME Remote Controller ................................... 151 6-4 Selecting Remote Controller Functions from an ME Remote Controller...................................... 155 6-5 Making Interlock Settings from an MA Remote Controller............................................................. 157 6-6 Changing the Room Temperature Detection Position.................................................................... 159 6-7 Test Run Method ................................................................................................................................ 160 6-8 Operation Characteristics and Refrigerant Charge ........................................................................ 161 6-9 Evaluating and Adjusting Refrigerant Charge.................................................................................161 6-10 The Following Symptoms Are Normal ............................................................................................. 166 6-11 Standard Operation Data (Reference Data) ..................................................................................... 167 Chapter 7 Troubleshooting Using Error Codes 7-1 Error Code and Preliminary Error Code Lists .................................................................................175 7-2 Error Code Definitions and Solutions: Codes [0 - 999]................................................................... 179

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7-3 Error Code Definitions and Solutions: Codes [1000 - 1999]........................................................... 180 7-4 Error Code Definitions and Solutions: Codes [2000 - 2999]........................................................... 184 7-5 Error Code Definitions and Solutions: Codes [3000 - 3999]........................................................... 191 7-6 Error Code Definitions and Solutions: Codes [4000 - 4999]........................................................... 192 7-7 Error Code Definitions and Solutions: Codes [5000 - 5999]........................................................... 210 7-8 Error Code Definitions and Solutions: Codes [6000 - 6999]........................................................... 223 7-9 Error Code Definitions and Solutions: Codes [7000 - 7999]........................................................... 239 Chapter 8 Troubleshooting Based on Observed Symptoms 8-1 MA Remote Controller Problems ...................................................................................................... 251 8-2 ME remote Controller Problems ....................................................................................................... 255 8-3 Refrigerant Control Problems ........................................................................................................... 259 8-4 Checking Transmission Waveform and for Electrical Noise Interference.................................... 264 8-5 Pressure Sensor Circuit Configuration and Troubleshooting Pressure Sensor Problems ........ 267 8-6 Troubleshooting Solenoid Valve Problems ..................................................................................... 269 8-7 Troubleshooting Outdoor Unit Fan Problems ................................................................................. 272 8-8 Troubleshooting LEV Problems........................................................................................................ 273 8-9 Troubleshooting Problems with Major Components on BC Controller ........................................ 277 8-10 Troubleshooting Inverter Problems (TKMU).................................................................................... 288 8-11 Troubleshooting Inverter Problems (YKMU) ................................................................................... 298 8-12 Control Circuit (TKMU) ...................................................................................................................... 307 8-13 Control Circuit (YKMU) ...................................................................................................................... 309 8-14 Measures for Refrigerant Leakage ................................................................................................... 311 8-15 Compressor Replacement Instructions ........................................................................................... 313 8-16 Solenoid Valve Block and Check Valve Replacement Instructions .............................................. 315 8-17 BC Controller Maintenance Instructions.......................................................................................... 319 8-18 Troubleshooting Problems Using the LED Status Indicators on the Outdoor Unit..................... 322 Chapter 9 LED Status Indicators on the Outdoor Unit Circuit Board 9-1 LED Status Indicators ........................................................................................................................ 325 9-2 LED Status Indicators Table ............................................................................................................. 328

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[1-4 Precautions for Wiring ]

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1 Check Before Servicing 1-4 Precautions for Wiring Control boxes house high-voltage and high-temperature electrical parts. They may still remain energized or hot after the power is turned off. When opening or closing the front cover of the control box, keep out of contact with the internal parts. Before inspecting the inside of the control box, turn off the power, leave the unit turned off for at least 10 minutes, and check that the voltage of the electrolytic capacitor (inverter main circuit) has dropped to 20 VDC or less. It will take approximately 10 minutes until the voltage is discharged after power off. Disconnect the outdoor unit fan board connector (CNINV) before performing maintenance work. Before connecting or disconnecting the connector, check that the outdoor unit fan is stopped and that the voltage of the main circuit capacitor has dropped to 20 VDC or below. If the outdoor unit fan is rotated by external forces such as strong winds, the main circuit capacitor can be charged and cause an electric shock. Refer to the wiring nameplate for details. Reconnect the connector (CNINV) to the fan board after completion of maintenance work. When the unit is turned on, the compressor will remain energized even when it is stopped to vaporize the liquid refrigerant that accumulates in the compressor. Before connecting wiring to TB7, check that the voltage has dropped below 20 VDC. When a system controller is connected to the centralized control transmission cable to which power is supplied from the out- door unit (power jumper on the outdoor unit is connected to CN40), be aware that power can be supplied to the centralized control transmission and the system controller may detect an error and send an error notice if the outdoor unit fan is rotated by external forces, such as strong winds, even when power to the outdoor unit is turned off. When replacing the internal electrical components of the control box, tighten the screws to the recommended tightening torque as specified below. Recommended tightening torque for the internal electrical components of the control box ∗1 When replacing semiconductor modules (e.g., diode stack, IPM, INV board (with IPM), fan board (with IPM)), apply heat- sink silicone evenly to the mounting surface of the semiconductor module (or the semiconductor module on the back of the circuit board). Next, tighten the screws holding the semiconductor module to one-third of the specified torque, and then tighten the screws to the specified torque. ∗2 Deviating from the recommended tightening torque may cause damage to the unit or its parts. Take the following steps to ensure that the screws are properly tightened. 1) Ensure that the spring washers are parallel to the terminal block. Even if the tightening torque is observed, if the washers are not parallel to the terminal block, then the semiconductor module is not installed properly. Screw Recommended tightening torque (N·m)

M3

0.69

M4

1.47

M5

2.55

M6

2.75

M8

6.20 Proper installation Loose screws Spring washers are parallel to the terminal block

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Chapter 2 Restrictions 2-1 System Configurations....................................................................................................................... 19 2-2 Types and Maximum Allowable Length of Cables........................................................................... 20 2-3 Switch Settings ................................................................................................................................... 21 2-4 M-NET Address Settings.................................................................................................................... 22 2-4-1 Address Settings List ............................................................................................................................ 22 2-4-2 Outdoor Unit Power Jumper Connector Connection............................................................................. 24 2-4-3 Outdoor Unit Centralized Controller Switch Setting.............................................................................. 24 2-4-4 Room Temperature Detection Position Selection................................................................................. 24 2-4-5 Start/Stop Control of Indoor Units......................................................................................................... 25 2-4-6 Miscellaneous Settings ......................................................................................................................... 25 2-4-7 Various Control Methods Using the Signal Input/Output Connector on Outdoor Unit .......................... 26 2-5 Demand Control Overview................................................................................................................. 29 2-6 System Connection Example............................................................................................................. 30 2-7 Example System with an MA Remote Controller ............................................................................. 32 2-7-1 Single Refrigerant System (Automatic Indoor/Outdoor Address Startup)............................................. 32 2-7-2 Single Refrigerant System with Two or More LOSSNAY Units ............................................................ 34 2-7-3 Grouped Operation of Units in Separate Refrigerant Circuits............................................................... 36 2-7-4 System with a Connection of System Controller to Centralized Control Transmission Line................. 38 2-7-5 System with a Connection of System Controller to Indoor-Outdoor Transmission Line ....................... 40 2-7-6 System with Multiple BC Controllers..................................................................................................... 42 2-8 Example System with an ME Remote Controller ............................................................................. 46 2-8-1 System with a Connection of System Controller to Centralized Control Transmission Line................. 46 2-9 Example System with an MA and an ME Remote Controller .......................................................... 48 2-9-1 System with a Connection of System Controller to Centralized Control Transmission Line................. 48 2-10 Restrictions on Refrigerant Pipes..................................................................................................... 51 2-10-1 Restrictions on Refrigerant Pipe Length ............................................................................................... 51 2-10-2 Restrictions on Refrigerant Pipe Size ................................................................................................... 57 2-10-3 BC Controller Connection Method ........................................................................................................ 58

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[2-2 Types and Maximum Allowable Length of Cables ]

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[2-3 Switch Settings ]

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2 Restrictions 2) Remote controller wiring *1 MA remote controller refers to MA remote controller (PAR-20MAU, PAR-21MAAU, PAR-30MAAU), Simple MA Re- mote Controller, and wireless remote controller. *2 The use of cables that are smaller than 0.75mm2 (AWG18) is recommended for easy handling. *3 When connected to the terminal block on the Simple remote controller, use cables that meet the cable size specifi- cations shown in the parenthesis. *4 When connecting PAR-30MAAU, use a 0.3mm2 sheathed cable. *5 ME remote controller refers to ME remote controller and Simple ME Remote Controller. 2-3 Switch Settings

Switch setting

The necessary switch settings depend on system configuration. Before performing wiring work, refer to the following page(s). [2-7 Example System with an MA Remote Controller](page 32) [2-8 Example System with an ME Remote Controller](page 46) [2-9 Example System with an MA and an ME Remote Controller](page 48) If the switch settings are changed while the unit is being powered, those changes will not take effect, and the unit will not function properly. *1. Applicable when LOSSNAY units are connected to the indoor-outdoor transmission line. *2. The outdoor units in the same refrigerant circuit are automatically designated as OC and OS in the order of capacity from large to small (if two or more units have the same capacity, in the order of address from small to large). *3. Turn off the power to all the outdoor units in the same refrigerant circuit. *4. When a PAR-30MAAU is connected to a group, no other MA remote controllers can be connected to the same group. *5. When setting the switch SW4 of the control board, set it with the outdoor unit power on. Refer to the following page(s). [5-1-1 Outdoor Unit Switch Functions and Factory Settings](page 117) MA remote controller*1 ME remote controller*5 Cable type Type

Cvv

Number of cores 2-core cable 2-core cable Cable size 0.3 to 1.25mm2 *2 *4 [AWG22 to 16] (0.75 to 1.25mm2 ) *3 [AWG18 to 16] 0.3 to 1.25mm2 *2 [AWG22 to 16] (0.75 to 1.25mm2 ) *3 [AWG18 to 16] Maximum overall line length 200 m [656ft] max. The section of the cable that exceeds 10m [32ft] must be included in the maximum in- door-outdoor transmission line distance. Units on which to set the switches Symbol Units to which the power must be shut off CITY MULTI indoor unit Main/sub unit

Ic

Outdoor units *3 and Indoor units LOSSNAY, OA processing unit *1

Lc

Outdoor units *3 and LOSSNAY ME remote controller Main/sub remote controller

Rc

Outdoor units *3 MA remote controller *4 Main/sub remote controller

Ma

Indoor units CITY MULTI outdoor unit*2

Oc,Os

Outdoor units *3 BC controller Main

Bc

Outdoor units *3 and BC controller Sub1, 2

Bs1, Bs2

Outdoor units *3 *5 and BC controller

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2-4 M-NET Address Settings 2-4-1 Address Settings List

M-NET Address settings

(1) Address settings table The need for address settings and the range of address setting depend on the configuration of the system. *1. If a given address overlaps any of the addresses that are assigned to other units, use a different, unused address within the setting range. *2. To set the outdoor unit address or the auxiliary outdoor unit address to "100," set the rotary switches to "50." *3. To set the ME remote controller address to "200," set the rotary switches to "00." *4. Some models of indoor units have two or three control boards. Assign an address to the No.1, No. 2, and No. 3 control boards so that the No. 2 control board address equals the No. 1 control board address plus 1, and that the No. 3 control board address equals the No. 1 control board address plus 2. *5. The outdoor units in the same refrigerant circuit are automatically designated as OC, and OS. They are designated as OC, and OS in the descending order of capacity (ascending order of address if the capacities are the same). *6. No address settings are required for units in a system with a single outdoor unit (with some exceptions). Address setting is required if a sub BC controller is connected. *7. When a PAR-30MAAU is connected to a group, no other MA remote controllers can be connected to the same group. Unit or controller Sym- bol Address setting range Setting method Factory address setting

City Multi

indoor unit Main/sub unit

Ic

0, 01 to 50*1 *4 *6 Assign the smallest address to the main indoor unit in the group, and assign sequential address numbers to the rest of the indoor units in the same group. In an R2 system with a sub BC controller, make the set- tings for the indoor units in the following order. (i) Indoor unit to be connected to the main BC controller (ii) Indoor unit to be connected to sub BC controller 1 (iii) Indoor unit to be connected to sub BC controller 2 Make the settings for the indoor units in the way that the formula "(i) < (ii) < (iii)" is true. 00

M-Net

adapter M-NET con- trol interface Free Plan adapter LOSSNAY, OA processing unit

Lc

0, 01 to 50*1 *4 *6 Assign an arbitrary but unique address to each of these units after assigning an address to all indoor units. 00 ME remote controller Main remote controller

Rc

101 to 150 Add 100 to the smallest address of all the indoor units in the same group. 101 Sub remote controller

Rc

151 to 200*3 Add 150 to the smallest address of all the indoor units in the same group. MA remote controller

Ma

No address settings required. (The main/sub setting must be made if 2 remote controllers are connected to the system.) *7 Main CITY MULTI outdoor unit

Oc

Os

0, 51 to 100*1 *2 *6 Assign an address that equals the lowest address of the indoor units in the same refrigerant circuit plus 50. Assign sequential addresses to the outdoor units in the same re- frigerant circuit. The outdoor units in the same refrigerant circuit are automatically designated as OC and OS. *5 00 Auxiliary outdoor unit BC controller (main)

Bc

0, 51 to 100*1 *2 *6 Assign an address that equals the address of the outdoor unit in the same refrigerant system plus 1. If a given address overlaps any of the addresses that are assigned to the outdoor units or to the sub BC controller, use a different, unused address within the setting range. 00 BC controller (sub1, 2)

Bs1

Bs2

51 to 100 *2 Assign an address to both the sub BC controller 1 and 2 that equals the lowest address of the indoor units that are connected to each of them plus 50. If a sub BC controller is connected, the automatic startup function is not available.

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2-4-2 Outdoor Unit Power Jumper Connector Connection There are limitations on the total number of units that are connectable to each refrigerant system. Refer to the DATABOOK for details. *1 The need for a power supply unit for transmission lines depends on the system configuration. *2 The replacement of the power jumper connector from CN41 to CN40 must be performed on only one outdoor unit in the system. 2-4-3 Outdoor Unit Centralized Controller Switch Setting *1 Set SW5-1 on all outdoor units in the same refrigerant circuit to the same setting. *2 When only the LM adapter is connected, leave SW5-1 to OFF (as it is). 2-4-4 Room Temperature Detection Position Selection To stop the fan during heating Thermo-OFF (SW1-7 and 1-8 on the indoor units to be set to ON), use the built-in thermistor on the remote controller or an optional thermistor. 1) To use the built-in sensor on the remote controller, set the SW1-1 to ON. (Factory setting: SW1-1 set to "OFF".) Some models of remote controllers are not equipped with a built-in temperature sensor. Use the built-in temperature sensor on the indoor unit instead. When using the built-in sensor on the remote controller, install the remote controller where room temperature can be detected. (Note) Factory setting for SW1-1 on the indoor unit of the All-Fresh Models is ON. 2) When an optional temperature sensor is used, set SW1-1 to OFF, and set SW3-8 to ON. When using an optional temperature sensor, install it where room temperature can be detected. System configura- tion Connection to the system con- troller Power supply unit for transmission lines Group operation of units in a sys- tem with multiple outdoor units Power supply switch connector connection System with one outdoor unit _ _ _ Leave CN41 as it is (Factory setting) System with multi- ple outdoor units Not connected _ Not grouped Grouped Disconnect the male connector from the fe- male power supply switch connector (CN41) and connect it to the female power supply switch connector (CN40) on only one of the outdoor units.*2 *Connect the S (shielded) terminal on the terminal block (TB7) on the outdoor unit whose CN41 was replaced with CN40 to the ground terminal ( ) on the electric box. With connection to the indoor unit system Not required Grouped/not grouped With connection to the central- ized control sys- tem Not required*1 (Powered from the outdoor unit) Grouped/not grouped Required *1 Grouped/not grouped Leave CN41 as it is (Factory setting) System configuration Centralized control switch (SW5-1) settings *1 Connection to the system controller Not connected Leave it to OFF. (Factory setting) Connection to the system controller Connected *2

On

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2-4-7 Various Control Methods Using the Signal Input/Output Connector on Outdoor Unit (1) Various connection options *1 For details, refer to section (2) Example of wiring connection. *2 For details, refer to section (2) Example of wiring connection and other relevant sections in the manual. [2-5 Demand Control Overview](page 29) *3 Low-noise mode is valid when Dip SW6-8 on the outdoor unit is set to OFF. When DIP SW6-8 is set to ON, 4 levels of on- DEMAND are possible, using different configurations of low-noise mode input and DEMAND input settings.When 2 or more outdoor units exist in one refrigerant circuit system, 8 levels of on-DEMAND are possible. *4. By setting Dip SW6-7, the Low-noise mode can be switched between the Capacity priority mode and the Low-noise priority mode. When SW6-7 is set to ON: The low-noise mode always remains effective. When SW6-7 is set to OFF: The low noise mode is cancelled when certain outside temperature or pressure criteria are met, and the unit goes into normal operation (capacity priority mode). *5 If multiple outdoor units are connected to the same refrigerant circuit, signal input/output settings need to be made for each outdoor unit. *6 Take out signals from the outdoor unit that is designated as OC if multiple outdoor units in the same system. *7 If the formula TH7>5 holds true, the fan will not go into operation when the contact receives signal input. *8 On the TKMU-A-H models, the error signal output function is disabled at default settings. Change the DipSW4 (No. 974) setting to use the error signal output function. When the setting is changed, base heaters cannot be used. Type Usage Function Terminal to be used*1 Option Input Prohibiting cooling/heating operation (thermo OFF) by an external input to the outdoor unit. *It can be used as the DEMAND control device for each system. DEMAND (level)

Cn3D*2

Adapter for external input

(Pac-

Sc36Na-E)

Performs a low level noise operation of the outdoor unit by an ex- ternal input to the outdoor unit.

It can be used as the silent operation device for each refrigerant

system. Low-noise mode (level) *3*4 Forces the outdoor unit to perform a fan operation by receiving sig- nals from the snow sensor.*5*7 Snow sensor signal input (level)

Cn3S

Cooling/heating operation can be changed by an external input to the outdoor unit. Auto-changeover

Cn3N

The operation mode of the unit can be changed from normal cool- ing operation (performance priority) to energy-saving cooling mode by an external signal input. Energy-saving mode

Cn3K

Out- put How to extract signals from the outdoor unit *It can be used as an operation status display device. *It can be used for an interlock operation with external devices. Operation status of the compressor*5

Cn51

Adapter for external out- put

(Pac-

Sc37Sa-E)

Error status*6 *8 Low-noise mod is effective. Capacity priority mode becomes effective. Cooling Heating Cooling Heating TH7<30°C[86°F] and 63HS1<32kg/cm2 TH7>3°C[37°F] and 63LS>4.6kg/cm2 TH7>35°C[95°F] or 63HS1>35kg/cm2 TH7<0°C[32°F] or 63LS<3.9kg/cm2

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2 Restrictions (2) Example of wiring connection

Caution

1) Wiring should be covered by insulation tube with supplementary insulation. 2) Use relays or switches with IEC or equivalent standard. 3) The electric strength between accessible parts and control circuit should have 2750V or more.

(1) Cn51

(2) Cn3S

Cn51

X

Y

L1

L2

e cru o s re w o p p m a

L

Distant control board Relay circuit 1 Outdoor unit control board Preparations in the field Maximum cable length is 10m 5 4 3

X

Y

L1 : Outdoor unit error display lamp L2 : Compressor operation lamp (compressor running state) X, Y : Relay (coil =<0.9W : DC12V)

Optional part : PAC-SC37SA-E or field supply.

Optional part : PAC-SC36NA-E or field supply.

X : Relay Snow sensor : The outdoor fan runs when X is closed in stop mode or thermostat mode.

X

Cn3S

Preparations in the field Maximum cable length is 10m External input adapter

Cn51

Y

L2

e cru o s re w o p p m a

L

Distant control board Relay circuit 1 Outdoor unit control board Preparations in the field Maximum cable length is 10m 4 3

Y

L2 : Compressor operation lamp (compressor running state) Y : Relay (coil =<0.9W : DC12V)

Optional part : PAC-SC37SA-E or field supply.

On the TKMU-A-H models, the error signal output function is disabled

at default settings. Change the DipSW4 (No. 974) setting to use the error signal output function. When the setting is changed, base heaters cannot be used. External input adapter Outdoor unit control board 2 3 1 Contact rating voltage >= DC15V Contact rating current >= 0.1A Minimum applicable load =< 1mA at DC Relay circuit

(3) Cn3N

Optional part :

PAC-SC36NA-E or field supply. Preparations in the field

Off

Cooling

On

Heating Normal

Y

Off

On

X

Contact rating voltage >= DC15V Contact rating current >= 0.1A Minimum applicable load =< 1mA at DC X : Cooling / Heating Y : Validity / Invalidity of X X,Y : Relay

Cn3N

X

Y

Relay circuit Outdoor unit control board Maximum cable length is 10m 1 2 3 2 External input adapter 2 External input adapter HP-TKMU-A-H model

(4) Cn3D

Optional part : PAC-SC36NA-E or field supply.

X : Low-noise mode X : Low-noise mode Y : Compressor ON/OFF X,Y : Relay Contact rating voltage >= DC15V Contact rating current >= 0.1A Minimum appicable load =< 1mA at DC

Y

X

Cn3D

Preparations in the field Maximum cable length is 10m External input adapter 2 Outdoor unit control board 3 2 1 Relay circuit

Optional part : PAC-SC36NA-E or field supply.

X

Cn3D

Preparations in the field Maximum cable length is 10m Outdoor unit control board 2 3 1 X : Relay fan frequency and maximum compressor frequency. Contact rating voltage >= DC15V Contact rating current >= 0.1A Minimum applicable load =< 1mA at DC Low-noise mode : The noise level is reduced by controlling the maximum Relay circuit External input adapter 2

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2 Restrictions 2-5 Demand Control Overview (1) General outline of control Demand control is performed by using the external signal input to the 1-2 and 1-3 pins of CN3D on the outdoor units (OC and OS). Between 2 and 8 steps of demand control is possible by setting Dip SW6-8 on the outdoor units (OC and OS). *1 Available demand functions HP72 - HP96T(Y)KMU-A(-H) models (single-outdoor-unit system) : 2 and 4 steps shown in the rows 1 and 2 in the table above only. HP144 - HP192T(Y)KMU-A(-H) models (two-outdoor-unit system OC+OS) : 2-8 steps shown in the rows 1, 2, 3, and 4 in the table above only. *2 Signal is input to CN3D on the outdoor unit whose SW6-8 is set to ON. When SW6-8 is set to OFF on all outdoor units, the signal is input to the CN3D on the OC. Outdoor units whose SW6-8 is set to ON are selectable in a single refrigerant system. *3 If wrong sequence of steps are taken, the units may go into the Thermo-OFF (compressor stop) mode. Ex) When switching from 100% to 50% (Incorrect) 100%→0%→50% The units may go into the Thermo-OFF mode. (Correct) 100%→75%→50% *4 The percentage of the demand listed in the table above is an approximate value based on the compressor volume and does not necessarily correspond with the actual capacity. *5 Notes on using demand control in combination with the low-noise mode To enable the low-noise mode, it is necessary to short-circuit 1-2 pin of CN3D on the outdoor unit whose SW6-8 is set to OFF. When SW6-8 is set to ON on all outdoor units, the following operations cannot be performed. Performing 4-step demand in combination with the low-noise operation in a single-outdoor-unit system. Performing 8-step demand in combination with the low-noise operation in a two-outdoor-unit system. 1) Contact input and control content 2-step demand control The same control as the Thermo-OFF is performed by closing 1-3 pin of CN3D. 4-step demand control (When SW6-8 is set to ON on an outdoor unit) Demand capacity is shown below. 8-step demand control (When SW6-8 is set to ON on two outdoor units) Demand capacity is shown below. *1. The outdoor units whose SW6-8 is set to ON are designated as No. 1 and No. 2 in the order of address from small to large. Ex) When outdoor units whose SW6-8 is set to ON are designated as OC and OS, OC=No. 1 and OS=No. 2. No Demand control switch Dip SW6-8 Input to CN3D*2

Oc

Os

Open Close Open Close Open Open 100% 50% 88% 75% Close 50% 0% 38% 25% Close Open 88% 38% 75% 63% Close 75% 25% 63% 50%

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2-7 Example System with an MA Remote Controller 2-7-1 Single Refrigerant System (Automatic Indoor/Outdoor Address Startup) (1) Sample control wiring (2) Cautions 1) ME remote controller and MA remote controller cannot both be connected to the same group of indoor units. 2) No more than 2 MA remote controllers can be connected to a group of indoor units. It is not possible to connect a pair of

Par-30Maau.

3) When the number of the connected indoor units is as shown in the table below, one or more transmission boosters (sold separately) are required. To connect two transmission boosters, connect them in par- allel. (Observe the maximum number of connectable indoor units that are listed in the specifications for each outdoor unit.) The table above shows the number of transmission boost- ers that is required by the system with three BC controllers. For each BC controller that is subtracted from the above- mentioned system, two additional indoor units can be con- nected. 4) Automatic address setup is not available if start-stop input (CN32, CN51, CN41) is used for a group operation of indoor units or when multiple indoor units with different functions are grouped in the same group. Refer to the following page(s). [2-7-2 Single Refrigerant System with Two or More LOSSNAY Units](page 34) 5) For information about connecting two or more LOSSNAY units to a system, refer to the following page(s). [2-7-2 Sin- gle Refrigerant System with Two or More LOSSNAY Units](page 34) (3) Maximum allowable length 1) Indoor/outdoor transmission line Maximum distance (1.25mm2 [AWG16] or larger)

L1 +L2+L3+L4+L5

200m[656ft]

L1 +L2+L3+L11+L12+L13

200m[656ft] 2) Transmission line for centralized control No connection is required. 3) MA remote controller wiring Maximum overall line length (0.3 to 1.25mm2 [AWG22 to 16]) m1 200m [656ft] m2+m3 200m [656ft] m4+m5 200m [656ft] *When connected to the terminal block on the Simple re- mote controller, use cables that meet the following cable size specifications: 0.75 - 1.25 mm2 [AWG18-14]. *When connecting PAR-30MAAU, use a 0.3 mm2 sheathed cable.

Ic

Tb5

M1M2

S

Tb15

1 2 00

Ic

Tb5

S

Tb15

1 2 00

A1 B2

Ma

A1 B2

Ma

A1 B2

Rc

Lc

Tb5

S

00

Ic

Tb5

S

1 2

Tb15

Ic

Tb5

S

Tb15

1 2 00 00

Ic

Tb5

S

Tb15

1 2 00

A1 B2

Ma

A1 B2

Ma

A1 B2

Ma

Group Group Group Group

A1 B2

Ma

m1

L11

m2

L4

L5

L12

Tb7

M1 M2

S

Tb3

Tb02

M1 M2 S

*1

Bs

Tb02

00

S

M1M2

L3

L1

L2

Leave the male connector on CN41 as it is.

Sw5-1 Off

Leave the male connector on CN41 as it is.

Sw5-1 Off

Number of transmission booster (sold separately) re- quired 1 unit 2 units When the P72 and P96 models are not included in the connect- ed indoor units 27 - 50 units

When the P72 and P96 models

are included in the connected indoor units 21 - 39 units 40 - 50 units

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[2-7 Example System with an MA Remote Controller ] 33

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2 Restrictions (4) Wiring method 1) Indoor/outdoor transmission line Daisy-chain terminals M1 and M2 of the terminal block for indoor-outdoor transmission line (TB3) on the outdoor units (OC and OS), of the terminal block for indoor-out- door transmission line (TB02) on the main BC controller (BC), and of the terminal block for indoor-outdoor trans- mission line (TB5) on each indoor unit (IC). (Non-polar- ized two-wire) Only use shielded cables. The outdoor units in the same refrigerant circuit are au- tomatically designated as OC and OS in the order of ca- pacity from large to small (if two or more units have the same capacity, in the order of address from small to large). Shielded cable connection Daisy-chain the ground terminal ( ) on the outdoor units (OC and OS), the S terminal of the terminal block (TB02) on the BC controller (BC), and the S terminal of the terminal block (TB5) on the indoor unit (IC) with the shield of the shielded cable. 2) Transmission line for centralized control No connection is required. 3) MA remote controller wiring Connect terminals 1 and 2 on the terminal block for MA remote controller line (TB15) on the indoor unit (IC) to the terminal block on the MA remote controller (MA). (Non-polarized two-wire) When 2 remote controllers are connected to the sys- tem When 2 remote controllers are connected to the system, connect terminals 1 and 2 of the terminal block (TB15) on the indoor unit (IC) to the terminal block on the two MA remote controllers. Set one of the MA remote controllers as a sub controller. (Refer to the Instruction Manual for the MA remote con- troller for the setting method.) Group operation of indoor units To perform a group operation of indoor units (IC), daisy- chain terminals 1 and 2 on the terminal block (TB15) on all indoor units (IC) in the same group, and then connect terminals 1 and 2 on the terminal block (TB15) on the in- door unit on one end to the terminal block on the MA re- motecontroller. (Non-polarized two-wire) When performing a group operation of indoor units that have different functions, "Automatic indoor/outdoor ad- dresssetup" is not available. 4) LOSSNAY connection Connect terminals M1 and M2 on the terminal block(TB5) on the indoor unit (IC) to the appropriate ter- minals on the terminal block (TB5) on LOSSNAY (LC). (Non-polarized two-wire) Interlock operation setting with all the indoor units in the same system will automatically be made. (It is required that the Lossnay unit be turned on before the outdoo- runit.) For information about certain types of systems (1. Sys- tems in which the LOSSNAY unit is interlocked with only part of the indoor units, 2. Systems in which the LOSS- NAY unit is operated independently from the indoor units, 3. Systems in which more than 16 indoor units are interlocked with the LOSSNAY unit, and 4. Systems to which two ore more LOSSNAY units are connected), re- fer to the following page(s). [2-7-2 Single Refrigerant System with Two or More LOSSNAY Units](page 34) 5) Switch setting Address setting is required as follows. (5) Address setting method The outdoor units in the same refrigerant circuit are automatically designated as OC and OS. They are designated as OC and OS in the descending order of capacity (ascending order of address if the capacities are the same). Proce- dures Unit or controller Address set- ting range Setting method Notes Factory setting 1 Indoor unit Main unit

Ic

No settings required.

Port number setting is required

For information about how to per- form a group operation of indoor units that feature different func- tions, refer to the following page(s). [2-7-2 Single Refrigerant System with Two or More LOSS- NAY Units](page 34) 00 Sub unit

Ic

2

Lossnay

Lc

No settings required.

00

3

Ma

remote con- troller Main remote con- troller

Ma

No settings required.

It is not possible to connect a pair

of PAR-30MAAU. Main Sub remote con- troller

Ma

Sub remote con- troller Settings to be made with the Sub/Main switch 4 Outdoor unit

Oc

Os

No settings required.

00

5 Auxiliary outdoor unit

Bc

controller

Bc

No settings required.

00

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[2-7 Example System with an MA Remote Controller ] 35

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2 Restrictions (4) Wiring method 1) Indoor/outdoor transmission line Daisy-chain terminals M1 and M2 of the terminal block for indoor-outdoor transmission line (TB3) on the outdoor units (OC and OS), of the terminal block for indoor-out- door transmission line (TB02) on the main and sub BC controllers (BC and BS), and of the terminal block for in- door-outdoor transmission line (TB5) on each indoor unit (IC). (Non-polarized two-wire) Only use shielded cables. The outdoor units in the same refrigerant circuit are au- tomatically designated as OC and OS in the order of ca- pacity from large to small (if two or more units have the same capacity, in the order of address from small to large). Shielded cable connection Daisy-chain the ground terminal ( ) on the outdoor units (OC and OS), the S terminal of the terminal block (TB02) on BC and BS, and the S terminal of the terminal block (TB5) on the indoor unit (IC) with the shield of the shielded cable. 2) Transmission line for centralized control No connection is required. 3) MA remote controller wiring Same as 2-7-1 When 2 remote controllers are connected to the sys- tem Same as 2-7-1 Group operation of indoor units Same as 2-7-1 4) LOSSNAY connection Connect terminals M1 and M2 on the terminal block (TB5) on the indoor unit (IC) to the appropriate terminals on the terminal block (TB5) on LOSSNAY (LC). (Non-po- larized two-wire) Interlock setting between the indoor units and LOSS- NAY units must be entered on the remote controller. For information about how to interlock the operation of indoor and LOSSNAY units, refer to the following page(s) in this Service Handbook. [6-5 Making Interlock Settings from an MA Remote Con- troller](page 157) 5) Switch setting Address setting is required as follows. (5) Address setting method The outdoor units in the same refrigerant circuit are automatically designated as OC and OS. They are designated as OC and OS in the descending order of capacity (ascending order of address if the capacities are the same). Proce- dures Unit or controller Address setting range Setting method Notes Fac- tory set- ting 1 Indoor unit Main unit

Ic

01 to 50 Assign the smallest address to the main unit in the group. In a system with a sub BC controller, make the settings for the indoor units in the following order. (i) Indoor unit to be connected to the main BC controller (ii) Indoor unit to be connected to sub BC controller 1 (iii) Indoor unit to be connected to sub BC controller 2 Make the settings for the indoor units in the way that the formula "(i) < (ii) < (iii)" is true. Port number setting is required To perform a group op- eration of indoor units that feature different functions, designate the indoor unit in the group with the greatest number of functions as the main unit. 00 Sub unit Assign sequential numbers starting with the address of the main unit in the same group +1. (Main unit address +1, main unit address +2, main unit address +3, etc.) 2

Lossnay

Oc

Os

51 to 100 Assign sequential address to the outdoor units in the same refrigerant circuit. The outdoor units are automatically des- ignated as OC and OS.(Note) To set the address to 100, set the rotary switches to 50. If the addresses that is as- signed to the main BC con- troller overlaps any of the addresses that are assigned to the outdoor units or to the sub BC controller, use a dif- ferent, unused address with- in the setting range. The use of a sub BC control- ler requires the connection of a main BC controller. 00 5 Auxiliary outdoor unit BCcon- troller (Sub)

Bs

51 to 100 Assign an address that equals the sum of the smallest address of the indoor units that are connected to the sub BC controller and 50. BC control- ler (Main)

Bc

OC (or OS if it exists) +1

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2-7-3 Grouped Operation of Units in Separate Refrigerant Circuits (1) Sample control wiring (2) Cautions 1) ME remote controller and MA remote controller cannot both be connected to the same group of indoor units. 2) No more than 2 MA remote controllers can be connected to a group of indoor units. It is not possible to connect a pair of

Par-30Maau.

3) Do not connect the terminal blocks (TB5) on the indoor units that are connected to different outdoor units with each other. 4) Replacement of male power jumper connector (CN41) must be performed only on one of the outdoor units. 5) Provide grounding to S terminal on the terminal block for transmission line for centralized control (TB7) on only one of the outdoor units. 6) When the number of the connected indoor units is as shown in the table below, one or more transmission boosters (sold separately) are required. To connect two transmission boosters, connect them in par- allel. (Observe the maximum number of connectable indoor units that are listed in the specifications for each outdoor unit.) The left table shows the number of transmission boost- ers that is required by the system with three BC control- lers. For each BC controller that is subtracted from the above-mentioned system, two additional indoor units can be connected. Refer to the DATABOOK for further information about how many booster units are required for a given system. (3) Maximum allowable length 1) Indoor/outdoor transmission line Maximum distance (1.25mm2 [AWG16] or larger)

L11+L12

200m [656ft]

L21+L22

200m [656ft] 2) Transmission line for centralized control

L31+L21

200m [656ft] 3) MA remote controller wiring Same as 2-7-1 4) Maximum line distance via outdoor unit (1.25mm2 [AWG16] or larger)

L12(L11)+L31+L22(L21)

500m [1640ft]

Ic

Tb5

S

Tb15

1 2 01

Ic

Tb5

S

Tb15

1 2 03

A1 B2

Ma

A1 B2

Ma

Lc

Tb5

S

07

Ic

Tb5

S

1 2

Tb15

Ic

Tb5

Move the male connector from CN41 to CN40.

Sw5-1 Off

Leave the male connector on CN41 as it is.

Sw5-1 Off

Leave the male connector on CN41 as it is.

Sw5-1 Off

Leave the male connector on CN41 as it is.

Sw5-1 Off

Tb3

Tb7

S

51

Os

Tb3

Tb7

M1 M2

S

52

Oc

Tb3

Tb7

S

55

Os

Tb3

Tb7

S

56

L31

To be left unconnected

S

Bc

Tb02

53

Bc

Tb02

57 To be left unconnected To be connected m1 m4 m5 Number of transmission boost- er (sold separately) required 1 unit 2 units When the P72 and P96 mod- els are not included in the con- nected indoor units 27 - 50 units

When the P72 and P96 mod-

els are included in the con- nected indoor units 21 - 39 units 40 - 50 units

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2 Restrictions (4) Wiring method 1) Indoor/outdoor transmission line Same as 2-7-2 Shielded cable connection Same as 2-7-2 2) Transmission line for centralized control Daisy-chain terminals M1 and M2 on the terminal block for transmission line for centralized control (TB7) on the out- door units (OC) in different refrigerant circuits and on the OC and OS (Note a) in the same refrigerant circuit. If a power supply unit is not connected to the transmission line for centralized control, replace the power jumper con- nector on the control board from CN41 to CN40 on only one of the outdoor units. a) The outdoor units in the same refrigerant circuit are automat- ically designated as OC and OS in the order of capacity from large to small (if two or more units have the same capacity, in the order of address from small to large). b) If TB7's on the outdoor units in the same refrigerant circuit are not daisy-chained, connect the transmission line for the central control system to TB7 of the OC. (Note a).To main- tain the central control even during an OC failure or a power failure, connect TB7 on OC and OS together. (If there is a problem with the outdoor unit whose power jumper was moved from CN41 to CN40, central control is not possible, even if TB7's are daisy-chained.) c) When connecting TB7, only commence after checking that the voltage is below 20 VDC. Only use shielded cables. Shielded cable connection Daisy-chain the S terminal on the terminal block (TB7) on the outdoor units (OC, OS) with the shield wire of the shield- ed cable. Short-circuit the earth terminal ( ) and the S ter- minal on the terminal block (TB7) on the outdoor unit whose power jumper connector is mated with CN40. 3) MA remote controller wiring Same as 2-7-1 When 2 remote controllers are connected to the system Same as 2-7-1 Group operation of indoor units Same as 2-7-1 4) LOSSNAY connection Same as 2-7-2 5) Switch setting Address setting is required as follows. (5) Address setting method The outdoor units in the same refrigerant circuit are automatically designated as OC and OS. They are designated as OC and OS in the descending order of capacity (ascending order of address if the capacities are the same). Proce- dures Unit or controller Address setting range Setting method Notes Fac- tory set- ting 1 Indoor unit Main unit

Ic

01 to 50 Assign the smallest address to the main unit in the group. In a system with a sub BC controller, make the settings for the indoor units in the following order. (i) Indoor unit to be connected to the main BC controller (ii) Indoor unit to be connected to sub BC controller 1 (iii) Indoor unit to be connected to sub BC controller 2 Make the settings for the indoor units in the way that the formula "(i) < (ii) < (iii)" is true. Port number setting is required To perform a group op- eration of indoor units that feature different functions, designate the indoor unit in the group with the greatest number of functions as the main unit. 00 Sub unit Assign sequential numbers starting with the address of the main unit in the same group +1. (Main unit address +1, main unit address +2, main unit address +3, etc.) 2

Lossnay

Oc

Os

51 to 100 Assign sequential address to the outdoor units in the same refrigerant circuit. The outdoor units are automatically des- ignated as OC and OS.(Note) To set the address to 100, set the rotary switches to 50. If the addresses that is as- signed to the main BC con- troller overlaps any of the addresses that are assigned to the outdoor units or to the sub BC controller, use a dif- ferent, unused address with- in the setting range. The use of a sub BC control- ler requires the connection of a main BC controller. 00 5 Auxiliary outdoor unit BCcon- troller (Sub)

Bs

51 to 100 Assign an address that equals the sum of the smallest address of the indoor units that are connected to the sub BC controller and 50. BC control- ler (Main)

Bc

OC (or OS if it exists) +1

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2-7-4 System with a Connection of System Controller to Centralized Control Transmission Line (1) Sample control wiring An example of a system in which a system controller is connected to the transmission cable for the centralized control system and the power is supplied from the outdoor unit (2) Cautions 1) ME remote controller and MA remote controller cannot both be connect- ed to the same group of indoor units. 2) No more than 2 MA remote controllers can be connected to a group of indoor units. It is not possible to connect a pair of PAR-30MAAU. 3) Do not connect the terminal blocks (TB5) on the indoor units that are con- nected to different outdoor units with each other. 4) Replacement of male power jumper connector (CN41) must be per- formed only on one of the outdoor units. 5) When the System controller is connected TB7 side and TKMU outdoor unit model is used, connect a PAC-SC51KUA to TB7 side. If a PAC- SC51KUA cannnot be used, connect the System controller to TB3 side. When YKMU outdoor unit model is used, the male power supply connec- tor can be connected to CN40, and the System controller can be connect- ed to TB7 side. 6) Short-circuit the shield terminal (S terminal) and the earth terminal ( ) on the terminal block for transmission line for centralized control (TB7) on the outdoor unit whose power jumper connector is mated with CN40. 7) When the number of the connected indoor units is as shown in the table below, one or more transmission boosters (sold separately) are required. To connect two transmission boosters, connect them in parallel. (Observe the maximum number of connectable indoor units that are listed in the specifications for each outdoor unit.) The left table shows the number of transmission boosters that is required by the system with three BC controllers. For each BC controller that is subtracted from the above-men- tioned system, two additional indoor units can be connected. Refer to the DATABOOK for further information about how many booster units are required for a given system. 8) When a power supply unit is connected to the transmission line for centralized control, leave the power jumper connec- tor on CN41 as it is (factory setting). (3) Maximum allowable length 1) Indoor/outdoor transmission line Same as 2-7-3 2) Transmission line for centralized control

L31+L32(L21)

200m [656ft] 3) MA remote controller wiring Same as 2-7-1 4) Maximum line distance via outdoor unit (1.25mm2 [AWG16] or larger)

L32+L31+L12(L11)

500m [1640ft]

L32+L22(L21)

500m [1640ft]

L12(L11)+L31+L22(L21)

500m[1640ft]

Ic

Tb5

S

Tb15

1 2 01

Ic

Tb5

S

Tb15

1 2 02

A

1

B

2

Ma

A

1

B

2

Ma

Lc

Tb5

S

07

Ic

Tb5

S

1 2

Tb15

Ic

Tb5

S

Tb15

1 2 05 04

Lc

Tb5

S

08

Ic

Tb5

S

Tb15

1 2 03

A

1

B

2

Ma

Ic

Tb5

S

Tb15

1 2 06

A

1

B

2

Ma

A

1

B

2

Ma

m3

L31

System controller

A B S

Note1

L32

Oc

To be connected m2 m1 Note1 When only the LM adapter is connected, leave SW5-1 to OFF (as it is). Note2 LM adapters require the power supply capacity of single-phase AC 208 - 230V.

Tb3

Tb7

S

51

Os

Tb3

Tb7

M1M2

S

52

Oc

Tb3

Tb7

S

55

Os

Tb02

57

L22

L21

L12

L11

Number of transmission booster (sold separately) required 1 unit 2 units When the P72 and P96 models are not included in the connected in- door units 27 - 50 units

When the P72 and P96 models are

included in the connected indoor units 21 - 39 units 40 - 50 units

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2 Restrictions (4) Wiring method 1) Indoor/outdoor transmission line Same as 2-7-2 Only use shielded cables. Shielded cable connection Same as 2-7-2 2) Transmission line for centralized control Daisy-chain terminals A and B on the system controller, ter- minals M1 and M2 on the terminal block for transmission line for centralized control (TB7) on the outdoor units (OC) in dif- ferent refrigerant circuits and on the outdoor units (OC and OS) in the same refrigerant circuit. (Note b) If a power supply unit is not connected to the transmission line for centralized control, replace the power jumper con- nector on the control board from CN41 to CN40 on only one of the outdoor units. If a system controller is connected, set the central control switch (SW5-1) on the control board of all outdoor units to

"On."

a) The outdoor units in the same refrigerant circuit are automat- ically designated as OC and OS in the order of capacity from large to small (if two or more units have the same capacity, in the order of address from small to large). b) If TB7's on the outdoor units in the same refrigerant circuit are not daisy-chained, connect the transmission line for the central control system to TB7 of the OC. (Note a).To main- tain the central control even during an OC failure or a power failure, connect TB7 on OC and OS together. (If there is a problem with the outdoor unit whose power jumper was moved from CN41 to CN40, central control is not possible, even if TB7's are daisy-chained.) c) When connecting TB7, only commence after checking that the voltage is below 20 VDC. Only use shielded cables. Shielded cable connection Daisy-chain the S terminal of the terminal block (TB7) on the system controller, OC, and OS with the shield of the shield- ed cable. Short-circuit the earth terminal ( ) and the S ter- minal on the terminal block (TB7) on the outdoor unit whose power jumper connector is mated with CN40. 3) MA remote controller wiring Same as 2-7-1 When 2 remote controllers are connected to the system Same as 2-7-1 Group operation of indoor units Same as 2-7-1 4) LOSSNAY connection Connect terminals M1 and M2 on the terminal block (TB5) on the indoor unit (IC) to the appropriate terminals on the terminal block for indoor-outdoor transmission line (TB5) on LOSSNAY (LC). (Non-polarized two-wire) Indoor units must be interlocked with the LOSSNAY unit us- ing the system controller. (Refer to the operation manual for the system controller for the setting method.) Interlock set- ting from the remote controller is required if the ON/OFF re- mote controller alone or the LM adapter alone is connected. 5) Switch setting Address setting is required as follows. (5) Address setting method The outdoor units in the same refrigerant circuit are automatically designated as OC and OS. They are designated as OC and OS in the descending order of capacity (ascending order of address if the capacities are the same). Proce- dures Unit or controller Ad- dress setting range Setting method Notes Fac- tory set- ting 1 Indoor unit Main unit

Ic

01 to 50 Assign the smallest address to the main unit in the group. In a system with a sub BC controller, make the settings for the indoor units in the fol- lowing order. (i) Indoor unit to be connected to the main BC controller (ii) Indoor unit to be connected to sub BC controller 1 (iii) Indoor unit to be connected to sub BC controller 2 Make the settings for the indoor units in the way that the formula "(i) < (ii) < (iii)" is true. Port number setting is re- quired To perform a group opera- tion of indoor units that fea- ture different functions, designate the indoor unit in the group with the greatest number of functions as the main unit. 00 Sub unit Assign sequential numbers starting with the address of the main unit in the same group +1. (Main unit address +1, main unit address +2, main unit address +3, etc.) 2

Lossnay

Oc

Os

51 to 100 Assign sequential address to the outdoor units in the same refrigerant circuit. The outdoor units are automatically desig- nated as OC and OS.(Note) To set the address to 100, set the rotary switches to 50. If the addresses that is assigned to the main BC controller overlaps any of the addresses that are as- signed to the outdoor units or to the sub BC controller, use a differ- ent, unused address within the setting range. The use of a sub BC controller re- quires the connection of a main BC controller. 00 5 Auxiliary outdoor unit BCcon- troller (Sub)

Bs

51 to 100 Assign an address that equals the sum of the smallest address of the indoor units that are connected to the sub BC controller and 50. BC control- ler (Main)

Bc

OC (or OS if it exists) +1

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2-7-5 System with a Connection of System Controller to Indoor-Outdoor Transmission Line (1) Sample control wiring (2) Cautions 1) ME remote controller and MA remote controller cannot both be con- nected to the same group of indoor units. 2) No more than 2 MA remote controllers can be connected to a group of indoor units. It is not possible to connect a pair of PAR-30MAAU. 3) Do not connect the terminal blocks (TB5) on the indoor units that are connected to different outdoor units with each other. 4) Replacement of male power jumper connector (CN41) must be per- formed only on one of the outdoor units. 5) Provide grounding to S terminal on the terminal block for transmis- sion line for centralized control (TB7) on only one of the outdoor units. 6) A maximum of 3 system controllers can be connected to the indoor- outdoor transmission line, with the exception that only one G(B)-50A may be connected. 7) When the total number of indoor units exceeds 20 (12 if one or more indoor units of the 72 model or above is connected), it may not be possible to connect a system controller to the indoor-outdoor trans- mission line. 8) When the number of the connected indoor units is as shown in the table below, one or more transmission boosters (sold separately) are required. To connect two transmission boosters, connect them in parallel. (Observe the maximum number of connectable indoor units that are listed in the specifications for each outdoor unit.) The table above shows the number of transmission boosters that is required by the system with three BC controllers. For each BC con- troller that is subtracted from the above-mentioned system, two ad- ditional indoor units can be connected. Refer to the DATABOOK for further information about how many booster units are required for a given system. (3) Maximum allowable length 1) Indoor/outdoor transmission line Maximum distance (1.25mm2 [AWG16] or larger)

L11+L12

200m [656ft]

L21+L22

200m [656ft]

L25

200m [656ft] 2) Transmission line for centralized control

L31+L21

200m [656ft] 3) MA remote controller wiring Same as 2-7-1 4) Maximum line distance via outdoor unit (1.25mm2 [AWG16] or larger)

L25+L31+L12(L11)

500m [1640ft]

L12(L11)+L31+L22(L21)

500m [1640ft]

Ic

Tb5

S

Tb15

1 2 01

Ic

Tb5

S

Tb15

1 2 02

A

1

B

2

Ma

A

1

B

2

Ma

Lc

Tb5

S

07

Ic

Tb5

S

1 2

Tb15

Ic

Tb5

S

Tb15

1 2 05 04

Lc

Tb5

S

08

Ic

Tb5

S

Tb15

1 2 03

A

1

B

2

Ma

Ic

Tb5

S

Tb15

1 2 06

A

1

B

2

Ma

A

1

B

2

Ma

Group Group Group Group Group m3 Interlock operation with the ventilation unit

Oc

L31

A B S

L25

M2

M1

M2

M1

M2

M1

M2

M1

M2

M1

M2

M1

M2

M1

M2

M1

M2

M1

M2

M1

M2

M1

M2

M1

M2

M1

M2

M1

M2

M1

M2

M1

M2

M1

M2

M1

Not Connect Not Connect Not Connect CN41 CN40 Replace

Sw5-1 Off On

Leave the male connector on CN41 as it is.

Sw5-1 Off On

Leave the male connector on CN41 as it is.

Sw5-1 Off On

Leave the male connector on CN41 as it is. System controller Note1

S

Bc

Tb02

53

S

Bc

Tb02

57

L22

L21

L12

L11

Number of transmission boost- er (sold separately) required 1 unit 2 units When the P72 and P96 models are not included in the connected indoor units 27 - 50 units

When the P72 and P96 models are in-

cluded in the connected indoor units 21 - 39 units 40 - 50 units

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2 Restrictions (4) Wiring method 1) Indoor/outdoor transmission line Daisy-chain terminals M1 and M2 of the terminal block for indoor- outdoor transmission line (TB3) on the outdoor units (OC and OS) (Note a), of the terminal block for indoor-outdoor transmission line (TB02) on the main and sub BC controllers (BC and BS), of the ter- minal block for indoor-outdoor transmission line (TB5) on each in- door unit (IC), and the S terminal of the system controller.(Non- polarized two-wire) Only use shielded cables. a) The outdoor units in the same refrigerant circuit are automatically designated as OC and OS in the order of capacity from large to small (if two or more units have the same capacity, in the order of address from small to large). Shielded cable connection Daisy-chain the ground terminal ( ) on the outdoor units (OC and OS), the S terminal of the terminal block (TB02) on the BC and BS, and the S terminal of the terminal block (TB5) on the indoor unit (IC) with the shield of the shielded cable. 2) Transmission line for centralized control Daisy-chain terminals M1 and M2 on the terminal block for transmis- sion line for centralized control (TB7) on the outdoor units (OC) in different refrigerant circuits and on the OC and OS in the same re- frigerant circuit. (Note b) If a power supply unit is not connected to the transmission line for centralized control, replace the power jumper connector on the con- trol board from CN41 to CN40 on only one of the outdoor units. Set the central control switch (SW5-1) on the control board of all out- door units to "ON." b) If TB7's on the outdoor units in the same refrigerant circuit are not daisy-chained, connect the transmission line for the central control system to TB7 of the OC. (Note a).To maintain the central control even during an OC failure or a power failure, connect TB7 on OC and OS together. (If there is a problem with the outdoor unit whose power jumper was moved from CN41 to CN40, central control is not possible, even if TB7's are daisy-chained.) c) When connecting TB7, only commence after checking that the volt- age is below 20 VDC. Only use shielded cables. Shielded cable connection Daisy-chain the S terminal on the terminal block (TB7) on the out- door units (OC, OS) with the shield wire of the shielded cable. Short- circuit the earth terminal ( ) and the S terminal on the terminal block (TB7) on the outdoor unit whose power jumper connector is mated with CN40. 3) MA remote controller wiring Same as 2-7-1 When 2 remote controllers are connected to the system Same as 2-7-1 Group operation of indoor units Same as 2-7-1 4) LOSSNAY connection Connect terminals M1 and M2 on the terminal block (TB5) on the in- door units (IC) to the appropriate terminals on the terminal block for indoor-outdoor transmission line (TB5) on LOSSNAY (LC). (Non-po- larized two-wire) Indoor units must be interlocked with the LOSSNAY unit using the system controller. (Refer to the operation manual for the system controller for the setting method.) Interlock setting from the remote controller is required if the ON/OFF remote controller alone is con- nected. 5) Switch setting Address setting is required as follows. (5) Address setting method The outdoor units in the same refrigerant circuit are automatically designated as OC and OS. They are designated as OC and OS in the descending order of capacity (ascending order of address if the capacities are the same). Proce- dures Unit or controller Address setting range Setting method Notes Facto- ry set- ting 1 Indoor unit Main unit

Ic

01 to 50 Assign the smallest address to the main unit in the group. In a system with a sub BC controller, make the settings for the indoor units in the fol- lowing order. (i) Indoor unit to be connected to the main BC controller (ii) Indoor unit to be connected to sub BC controller 1 (iii) Indoor unit to be connected to sub BC controller 2 Make the settings for the indoor units in the way that the formula "(i) < (ii) < (iii)" is true. Port number setting is required To perform a group op- eration of indoor units that feature different functions, designate the indoor unit in the group with the greatest number of functions as the main unit. 00 Sub unit Assign sequential numbers starting with the address of the main unit in the same group +1. (Main unit address +1, main unit address +2, main unit address +3, etc.) 2

Lossnay

51 to 100 Assign sequential address to the outdoor units in the same refrigerant circuit. The outdoor units are automatically desig- nated as OC and OS.(Note) To set the address to 100, set the rotary switches to 50. If the addresses that is as- signed to the main BC con- troller overlaps any of the addresses that are assigned to the outdoor units or to the sub BC controller, use a dif- ferent, unused address with- in the setting range. The use of a sub BC control- ler requires the connection of a main BC controller. 00 5 Auxiliary outdoor unit BCcon- troller (Sub)

Bs

51 to 100 Assign an address that equals the sum of the smallest address of the indoor units that are connected to the sub BC controller and 50. BC control- ler (Main)

Bc

OC (or OS if it exists) +1

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2-7-6 System with Multiple BC Controllers (1) Sample control wiring (2) Cautions 1) ME remote controller and MA remote controller cannot both be con- nected to the same group of indoor units. 2) No more than 2 MA remote controllers can be connected to a group of indoor units. It is not possible to connect a pair of PAR-30MAAU. 3) Do not connect the terminal blocks (TB5) on the indoor units that are connected to different outdoor units with each other. 4) Replacement of male power jumper connector (CN41) must be per- formed only on one of the outdoor units. 5) Short-circuit the S (shield) terminal of the terminal block for the cen- tral control unit (TB7) and the ground terminal ( ) on the outdoor unit whose power jumper was moved from CN41 to CN40. 6) When the number of the connected indoor units is as shown in the table below, one or more transmission boosters (sold separately) are required. To connect two transmission boosters, connect them in parallel. (Observe the maximum number of connectable indoor units that are listed in the specifications for each outdoor unit.) The table above shows the number of transmission boost- ers that is required by the system with three BC controllers. For each BC controller that is subtracted from the above- mentioned system, two additional indoor units can be con- nected. Refer to the DATABOOK for further information about how many booster units are required for a given system. 7) When a power supply unit is connected to the transmission line for centralized control, leave the power jumper connec- tor on CN41 as it is (factory setting). (3) Maximum allowable length 1) Indoor/outdoor transmission line Maximum distance (1.25mm2 [AWG16] or larger)

L11+L12

200m [656ft]

L21+L22

200m [656ft] 2) Transmission line for centralized control

L31+L32(L21)

200m [656ft] 3) MA remote controller wiring Maximum overall line length (0.3 to 1.25mm2 [AWG22 to 16]) m1 200m [656ft] m2+m3 200m [656ft] 4) Maximum line distance via outdoor unit (1.25mm2 [AWG16] or larger)

L32+L31+L12(L11)

500m [1640ft]

L32+L22(L21)

500m [1640ft]

L12(L11)+L31+L22(L21)

500m[1640ft]

L11

L21

Oc

Tb3

Tb7

S

51

L31

A B S

L32

Os1

Tb3

Tb7

M1M2

S

52

Oc

Tb3

Tb7

S

54

Os1

Tb3

Tb7

S

55

Ma

A1 B2

Ma

A1 B2

Ma

Ic

Tb5

S

1 2

Tb15

53 57

Tb02

M1M2 S

Bs

Tb02

S

Bs

Tb02

S

A1 B2

Ma

61

Bs

Tb02

S

1 2

Lc

Tb5

S

13 1 2 m2 m3 m1

Sw5-1 Off On

Leave the male connector on CN41 as it is.

Sw5-1 Off On

Leave the male connector on CN41 as it is.

Sw5-1 Off On

Leave the male connector on CN41 as it is. System controller Note1

M1M2

Number of transmission booster (sold separately) required 1 unit 2 units When the P72 and P96 models are not in- cluded in the connected indoor units 27 - 50 units

When the P72 and P96 models are includ-

ed in the connected indoor units 21 - 39 units 40 - 50 units

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2 Restrictions (4) Wiring method 1) Indoor/outdoor transmission line Daisy-chain terminals M1 and M2 of the terminal block for indoor-outdoor transmission line (TB3) on the outdoor units (OC and OS) (Note a), of the terminal block for in- door-outdoor transmission line (TB02) on the main and sub BC controllers (BC and BS), and of the terminal block for indoor-outdoor transmission line (TB5) on each indoor unit (IC). (Non-polarized two-wire) Only use shielded cables. a) The outdoor units in the same refrigerant circuit are auto- matically designated as OC and OS in the order of ca- pacity from large to small (if two or more units have the same capacity, in the order of address from small to large). Shielded cable connection Daisy-chain the ground terminal ( ) on the outdoor units (OC and OS), the S terminal of the terminal block (TB02) on the BC and BS, and the S terminal of the terminal block (TB5) on the indoor unit (IC) with the shield of the shielded cable. 2) Transmission line for centralized control Daisy-chain terminals A and B of the system controller, M1 and M2 terminals of TB7 (terminal block for central- ized control system connection) on the outdoor units (OC) in different refrigerant systems, and M1 and M2 ter- minals of TB7 (terminal block for centralized control sys- tem connection) on the outdoor units (OC and OS ) in the same refrigerant circuit. (Note b) If a power supply unit is not connected to the transmis- sion line for centralized control, replace the power jump- er connector on the control board from CN41 to CN40 on only one of the outdoor units. When connecting a system controller, set the centralized control switch (SW5-1) on the control board of all indoor units to "ON." b) If TB7's on the outdoor units in the same refrigerant cir- cuit are not daisy-chained, connect the transmission line for the central control system to TB7 of the OC. (Note a).To maintain the central control even during an OC fail- ure or a power failure, connect TB7 on OC and OS to- gether. (If there is a problem with the outdoor unit whose power jumper was moved from CN41 to CN40, central control is not possible, even if TB7's are daisy-chained.) c) When connecting TB7, only commence after checking that the voltage is below 20 VDC. Only use shielded cables. Shielded cable connection Daisy-chain the S terminal of the terminal block (TB7) on the system controller, OC, and OS with the shield of the shielded cable. Short-circuit the earth terminal ( ) and the S terminal on the terminal block (TB7) on the outdoor unit whose power jumper connector is mated with CN40. 3) MA remote controller wiring Same as 2-7-1 When 2 remote controllers are connected to the sys- tem Same as 2-7-1 Group operation of indoor units Same as 2-7-1 4) LOSSNAY connection Connect terminals M1 and M2 on the terminal block (TB5) on the indoor unit (IC) to the appropriate terminals on the terminal block for indoor-outdoor transmission line (TB5) on LOSSNAY (LC). (Non-polarized two-wire) Indoor units must be interlocked with the LOSSNAY unit using the system controller. (Refer to the operation man- ual for the system controller for the setting method.) In- terlock setting from the remote controller is required if the ON/OFF remote controller alone or the LM adapter alone is connected. 5) Switch setting Address setting is required as follows.

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[2-7 Example System with an MA Remote Controller ]

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(5) Address setting method The outdoor units in the same refrigerant circuit are automatically designated as OC and OS. They are designated as OC and OS in the descending order of capacity (ascending order of address if the capacities are the same). Pro- ce- dur es Unit or controller Address setting range Setting method Notes Fac- tory set- ting 1 Indoor unit Main unit

Ic

01 to 50 Assign the smallest address to the main unit in the group. In a system with a sub BC controller, make the set- tings for the indoor units in the following order. (i) Indoor unit to be connected to the main BC control- ler (ii) Indoor unit to be connected to sub BC controller 1 (iii) Indoor unit to be connected to sub BC controller 2 Make the settings for the indoor units in the way that the formula "(i) < (ii) < (iii)" is true. Port number setting is re- quired To perform a group opera- tion of indoor units that feature different functions, designate the indoor unit in the group with the greatest number of func- tions as the main unit. 00 Sub unit Assign sequential numbers starting with the address of the main unit in the same group +1. (Main unit address +1, main unit address +2, main unit address +3, etc.) 2

Lossnay

51 to 100 The sum of the smallest address of the indoor units in the same system and 50. Assign sequential address to the outdoor units in the same refrigerant circuit. The outdoor units are automatically designated as OC and OS.(Note) To set the address to 100, set the rotary switches to 50. 00 5 Auxilia- ry out- door unit

Bc

controller (Sub)

Bs

51 to 100 Assign an address that equals the sum of the smallest address of the indoor units that are connected to the sub BC controller and 50. To set the address to 100, set the rotary switches to 50. If the addresses that is assigned to the main BC controller over- laps any of the addresses that are assigned to the outdoor units or to the sub BC control- ler, use a different, unused ad- dress within the setting range. The use of a sub BC controller requires the connection of a main BC controller. 00 BC con- troller (Main)

Bc

51 to 100 OC (or OS if it exists) +1

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[2-8 Example System with an ME Remote Controller ]

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2-8 Example System with an ME Remote Controller 2-8-1 System with a Connection of System Controller to Centralized Control Transmission Line (1) Sample control wiring (2) Cautions 1) ME remote controller and MA remote controller cannot both be connected to the same group of indoor units. 2) No more than 2 ME remote controllers can be connected to a group of indoor units. 3) Do not connect the terminal blocks (TB5) on the indoor units that are connected to different outdoor units with each other. 4) Replace the power jumper connector of the control board from CN41 to CN40 on only one of the outdoor units. 5) Provide an electrical path to ground for the S terminal on the terminal block for centralized control on only one of the out- door units. 6) When the number of the connected indoor units is as shown in the table below, one or more transmission boosters (sold separately) are required. To connect two transmission boosters, connect them in par- allel. (Observe the maximum number of connectable indoor units that are listed in the specifications for each outdoor unit.) The left table shows the number of transmission boosters that is required by the system with three BC controllers. For each BC controller that is subtracted from the above-men- tioned system, two additional indoor units can be connected. Refer to the DATABOOK for further information about how many booster units are required for a given system. 7) When a power supply unit is connected to the transmission line for centralized control, leave the power jumper connec- tor on CN41 as it is (factory setting). (3) Maximum allowable length 1) Indoor/outdoor transmission line Same as 2-7-3 2) Transmission line for centralized control Same as 2-7-4 3) ME remote controller wiring Maximum overall line length (0.3 to 1.25mm2 [AWG22 to 16]) m1 10m [32ft] m2+m3 10m [32ft] If the standard-supplied cable must be extended, use a cable with a diameter of 1.25mm2 [AWG16]. The section of the cable that exceeds 10m [32ft] must be included in the maximum indoor-outdoor transmission line distance described in (1). When connected to the terminal block on the Simple re- mote controller, use cables that meet the following cable size specifications: 0.75 - 1.25 mm2 [AWG18-16]. 4) Maximum line distance via outdoor unit (1.25 mm2 [AWG16] or large) Same as 2-7-4

Ic

Tb5

S

Tb15

1 2 01

Ic

Tb5

S

Tb15

1 2 02

Lc

Tb5

S

07

Ic

Tb5

S

1 2

Tb15

Ic

Tb5

S

Tb15

51

Os

Tb3

Tb7

M1M2

S

52

Oc

Tb3

Tb7

S

55

Os

Tb3

Tb7

A1 B2

Rc

154

A1 B2

Rc

m3 106

A1 B2

Rc

m2

S

Bc

Tb02

53

S

Bc

Tb02

57

L12

L11

L22

L21

M1M2

Number of transmission booster (sold separately) required 1 unit 2 units 3 units When the P72 and P96 models are not included in the connected indoor units 15 - 34 units 35 - 50 units

When the P72 and P96 models are in-

cluded in the connected indoor units 11 - 26 units 27 - 42 units 43 - 50 units

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[2-8 Example System with an ME Remote Controller ] 47

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2 Restrictions (4) Wiring method 1) Indoor/outdoor transmission line Same as 2-7-2 Shielded cable connection Same as 2-7-2 2) Transmission line for centralized control Same as 2-7-4 Shielded cable connection Same as 2-7-4 3) ME remote controller wiring ME remote controller is connectable anywhere on the in- door-outdoor transmission line. When 2 remote controllers are connected to the sys- tem Refer to the section on Switch Setting. Performing a group operation (including the group operation of units in different refrigerant circuits). Refer to the section on Switch Setting. 4) LOSSNAY connection Same as 2-7-4 5) Switch setting Address setting is required as follows. (5) Address setting method The outdoor units in the same refrigerant circuit are automatically designated as OC and OS. They are designated as OC and OS in the descending order of capacity (ascending order of address if the capacities are the same). Proce- dures Unit or controller Ad- dress setting range Setting method Notes Fac- tory set- ting 1 Indoor unit Main unit

Ic

01 to 50 Assign the smallest address to the main unit in the group. In a system with a sub BC controller, make the settings for the indoor units in the fol- lowing order. (i) Indoor unit to be connected to the main BC controller (ii) Indoor unit to be connected to sub BC controller 1 (iii) Indoor unit to be connected to sub BC controller 2 Make the settings for the indoor units in the way that the formula "(i) < (ii) < (iii)" is true. Port number setting is required To perform a group op- eration of indoor units that have different func- tions, set the indoor unit in the group with the greatest number of functions as the main unit. 00 Sub unit Assign sequential numbers starting with the address of the main unit in the same group +1. (Main unit address +1, main unit address +2, main unit address +3, etc.) 2

Lossnay

Lc

01 to 50 Assign an arbitrary but unique address to each of these units after assigning an address to all indoor units. None of these addresses may overlap any of the indoor unit addresses. 00 3

Me

remote controller Main remote con- troller

Rc

101 to 150 Add 100 to the main unit address in the group It is not necessary to set the 100s digit. To set the address to 200, set the rotary switches to 00. 101 Sub remote con- troller

Rc

151 to 200 Add 150 to the main unit address in the group 4 Outdoor unit

Oc

Os

51 to 100 Assign sequential address to the outdoor units in the same refrigerant circuit. The outdoor units are automatically desig- nated as OC and OS.(Note) To set the address to 100, set the rotary switches to 50. If the addresses that is as- signed to the main BC con- troller overlaps any of the addresses that are assigned to the outdoor units or to the sub BC controller, use a dif- ferent, unused address with- in the setting range. The use of a sub BC control- ler requires the connection of a main BC controller. 00 5 Auxiliary outdoor unit BCcon- troller (Sub)

Bs

51 to 100 Assign an address that equals the sum of the smallest address of the indoor units that are connected to the sub BC controller and 50. BC control- ler (Main)

Bc

OC (or OS if it exists) +1

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Ma

A1 B2

Rc

A1 B2

Ma

Ic

Tb5

S

1 2

Tb15

Ic

Tb5

S

Tb15

1 2 04 03 104

A1 B2

Rc

Oc

Tb3

Tb7

S

51

Os

Tb3

Tb7

S

52

Oc

Tb3

Tb7

S

54

Os

Tb3

Tb7

S

55

L31

M1M2

Number of transmission booster (sold separately) required 1 unit 2 units 3 units When the P72 and P96 models are not included in the connected indoor units 15 - 34 units 35 - 50 units

When the P72and P96 models

are included in the connected in- door units 11 - 26 units 27 - 42 units 43 - 50 units

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[2-9 Example System with an MA and an ME Remote Controller ]

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Rc

151 to 200 Add 150 to the main unit ad- dress in the group. 3

Lossnay

Lc

01 to 50 Assign an arbitrary but unique address to each of these units after assigning an address to all indoor units. None of these addresses may over- lap any of the indoor unit addresses. 00 4 Outdoor unit

Oc

Os

51 to 100 Assign sequential address to the outdoor units in the same refrig- erant circuit. The outdoor units are automati- cally designated as OC and OS.(Note) To set the address to 100, set it to 50. If the addresses that is assigned to the main BC controller overlaps any of the addresses that are assigned to the out- door units or to the sub BC controller, use a different, unused address within the setting range. The use of a sub BC controller requires the connection of a main BC controller. 00 5 Auxiliary outdoor unit BCcontroller (Sub)

Bs

51 to 100 Assign an address that equals the sum of the smallest address of the indoor units that are connected to the sub BC controller and 50. BC controller (Main)

Bc

OC (or OS if it exists) +1

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[2-10 Restrictions on Refrigerant Pipes ]

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1) A system that requires more than 16 BC controller ports requires two or three BC controllers (main and sub), and three pipes will be used between the main and the sub BC controllers. 2) When connecting two sub BC controllers, observe the maximum allowable length in the table above. 3) When connecting two sub BC controllers, install them in parallel. 4) To connect the P72 through P96 models of indoor units, use an optional twinning pipe kit (Model: CMY-R160-J) and merge the two ports before connecting them. 5) Do not connect the P72 or P96 models of indoor units and other models of indoor units at the same port. 6) Note the following when connecting multiple indoor units to a single port. Those indoor units connected to the same port must be installed in the same room. Set the indoor temperature via the connected remote controller, and when connecting multiple remote controllers, configure these controllers as a group by making appropriate settings. These indoor units can only be operated in the same mode. 7) The maximum capacity of the indoor units that is connectable to the CMB-P-NU-GB types of sub BC controllers is P126 or below (when two GB type controllers are connected P126 or below for both combined) . The maximum total capacity of indoor units that is connectable to the sub BC controller CMB-P1016NU-HB is P126 or below. If at least one CMB-P1016NU-HB unit is connected, the maximum total capacity of connectable indoor units to a system with two sub controllers is P168 or below. 0 10 20 30 40 50 60 70 0 5 10 15

[Pury-Hp192Tskmu-A-H]

[Pury-Hp192Yskmu-A]

The height difference and the pipe length between BC controller and indoor units Restrictions on pipe length Aggregate length of all pipes(m[ft]) Pipe length between main BC controller and farthest indoor unit (m[ft]) Height difference between main BC controller and farthest indoor unit (m[ft]) [32] [16] [32] [49] [64] [98] [131] [164] [196] [229] 110 1000 900 800 700 600 500 400 300 200 10 20 30 40 50 60 70 80 90 100 Pipe length between outdoor unit and BC controller (m[ft]) [32] [64] [98] [131] [164] [196] [229] [262] [295] [328] [360] [3280] [2952] [2624] [2296] [1968] [1640] [1312] [984] [656] 1000 900 800 700 600 500 400 300 200 10 20 30 40 50 60 70 80 90 100 110 Aggregate length of all pipes(m[ft]) Pipe length between outdoor unit and BC controller (m[ft]) [32] [64] [98] [131] [164] [196] [229] [262] [295] [328] [360] [3280] [2952] [2624] [2296] [1968] [1640] [1312] [984] [656] 1000 900 800 700 600 500 400 300 200 10 20 30 40 50 60 70 80 90 100 110 Aggregate length of all pipes(m[ft]) Pipe length between outdoor unit and BC controller (m[ft]) [32] [64] [98] [131] [164] [196] [229] [262] [295] [328] [360] [3280] [2952] [2624] [2296] [1968] [1640] [1312] [984] [656]

[Pury-Hp72, P96Tkmu-A-H]

[Pury-Hp72, P96Ykmu-A]

[Pury-Hp144Tskmu-A-H]

[Pury-Hp144Yskmu-A]

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Chapter 4 Electrical Components and Wiring Diagrams 4-1 Outdoor Unit Circuit Board Arrangement......................................................................................... 87 4-1-1 Outdoor Unit Control Box...................................................................................................................... 87 4-1-2 Transformer Box ................................................................................................................................... 89 4-2 Outdoor Unit Circuit Board Components ......................................................................................... 90 4-2-1 Control Board........................................................................................................................................ 90 4-2-2 M-NET Board (Transmission Power Supply Board) ............................................................................. 91 4-2-3 INV Board ............................................................................................................................................. 92 4-2-4 Fan Board ............................................................................................................................................. 94 4-2-5 Noise Filter............................................................................................................................................ 96 4-3 Outdoor Unit Electrical Wiring Diagrams ......................................................................................... 98 4-4 Transmission Booster Electrical Wiring Diagrams ....................................................................... 100 4-5 BC Controller Circuit Board Arrangement ..................................................................................... 101 4-5-1 BC Controller Control Box................................................................................................................... 101 4-6 BC Controller Circuit Board Components...................................................................................... 102 4-6-1 BC Board ............................................................................................................................................ 102 4-6-2 Four-Relay Board................................................................................................................................ 103 4-6-3 Ten-Relay Board................................................................................................................................. 103 4-7 BC Controller Electrical Wiring Diagrams...................................................................................... 104

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[4-1 Outdoor Unit Circuit Board Arrangement ]

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4 Electrical Components and Wiring Diagrams 4 Electrical Components and Wiring Diagrams 4-1 Outdoor Unit Circuit Board Arrangement 4-1-1 Outdoor Unit Control Box

1. Pury-Hp72, Hp96Tkmu-A-H

1) Exercise caution not to damage the bottom and the front panel of the control box. Damage to these parts affect the water- proof and dust proof properties of the control box and may result in damage to its internal components. 2) Faston terminals have a locking function. Make sure the cable heads are securely locked in place. Press the tab on the ter- minals to remove them. 3) Control box houses high temperature parts. Be well careful even after turning off the power source. 4) Disconnect the outdoor unit fan board connector (CNINV) before performing maintenance work. To plug or unplug- connectors, check that the outdoor unit fan is not rotating and that the voltage of capacitor in the main circuit is 20 VDC or below. The capacitor may collect a charge and cause an electric shock when the outdoor unit fan rotates in windy conditions. Refer to the wiring nameplate for details. 5) To connect wiring to TB7, check that the voltage is 20 VDC or below. 6) Reconnect the connector (CNINV) to the fan board after completion of maintenance work. 7) When opening or closing the front panel of the control box, do not let it come into contact with any of the internal components. Before inspecting the inside of the control box, turn off the power, keep the unit off for at least 10 minutes, and confirm that the capacitor voltage (inverter main circuit) has dropped to 20 VDC or less. It takes about 10 minutes to discharge electricity after the power supply is turned off. 8) When the power is turned on, the compressor is energized even while it is not operating. Before turning on the power, discon- nect all power supply wires from the compressor terminal block, and measure the insulation resistance of the compressor. Check the compressor for a graound fault. If the insulation resistance is 1.0 MΩ or below, connect all power supply wires to the compressor and turn on the power to the outdoor unit. The liquid refrigerant in the compressor will evaporate by energizing the compressor.

Control box houses high-voltage parts. When opening or closing the front panel of the control box, do not let it come into contact with any of the internal components. Before inspecting the inside of the control box, turn off the power, keep the unit off for at least 10 minutes, and check that the the voltage of the electrolytic capacitor (Inverter main circuit) is 20VDC or below. (It takes about 10 minutes to discharge electricity after the power supply is turned off.) FAN INV board Control board M-NET board

Ipm

Note 2 Noise filter Rush current protection resistor (R1) Note 2 DC reactor

(Dcl)

INV board Current sensor

(Acct1)

Current sensor

(Dcct1)

Current sensor

(Acct2)

Diode stack Electromagnetic contactor (72C) Ground terminal Note 1 Smoothing capacitor (C1) Terminal block for transmission line

(Tb3, Tb7)

Terminal block for power supply

(Tb1)

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[4-3 Outdoor Unit Electrical Wiring Diagrams ]

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4-3 Outdoor Unit Electrical Wiring Diagrams

(1) Pury-Hp72, Hp96Tkmu-A-H

For opening/closing the bypass circuit Terminal block Central control transmission cable Power supply Function setting connector IPM temperature Heat exchanger outlet pipe temperature ACC inlet pipe temperature Discharge pipe temperature Thermistor

Sv9

Tb1

Tb3

Tb7

Th4

Th5

Th6

Thhs

Z24,25,26

DC reactor Current sensor(AC) Low pressure Discharge pressure High pressure protection for the outdoor unit Pressure switch Pressure sensor Explanation Explanation 4-way valve (Cooling/Heating switching) For opening/closing the bypass circuit under the O/S Solenoid valve Solenoid valve

Dcl

LEV5a

Acct1,2

63Ls

63Hs1

63H1

Symbol Symbol 21S4a

C1

Dcct1

SV1a SV5b Outdoor unit heat exchanger capacity control SV4a,b,d Subcooled liquid refrigerant temperature *1. Single-dotted lines indicate wiring not

supplied with the unit. *2. Dot-dash lines indicate the control box

boundaries. *3. Refer to the Data book for connecting

input/output signal connectors. *4. Daisy-chain terminals (TB3) on the outdoor

units in the same refrigerant system together. *5. Faston terminals have a locking function.

Make sure the terminals are securely locked

in place after insertion. Press the tab on

the terminals to removed them. *6. Control box houses high-voltage parts.

Before inspecting the inside of the control box,

turn off the power,keep the unit off for at

least 10 minutes, and confirm that the voltage

at both ends of the main capacitor (C1) has

dropped to DC20V or less.

X001

For inrush current prevention

R1

Choke coil (for high frequency noise reduction)

L

Indoor/Outdoor transmission cable Magnetic relay (inverter main circuit)72C Heat exchanger capacity control Linear expansion valve (for the control of evaporating temperature) Resistor For current detection

Rsh01

Capacitor (inverter main circuit) Current sensor(DC) For opening/closing the injection circuit

Lev4

For opening/closing the defrost circuit

Sv10,11

OA temperature

Th7

Th9,11

Ground

L3

L2

L1

X14

X13

6 1 3 5 1 2 red

Cnps

1 3 2 1

Tp1 Tp2

Tb3

2 3

Tb7

M1 M2

M1 M2 S

5 1 2 3 4 1 2 t° 1 2 1 3 2 3 4 6 1 2 2

Cn82

blue 1 3 4

Cn83

black 3 1 6

X12

1 3

Cn508

blue

Cn4

black 2 3 1 t

Sw001

1 3 °

Cn2

7 1 2 1 3 3 1 4 3 2 2 3 1 1

Th4

t 4 ° 1 1

Cn211

green 2 3 1 2 3 3 2 1 6

Cnsnr

5 4 3 2 1

U

V

W

Fan motor (Heat exchanger)

Ms

3~ 4 1 6

Cninv

2

Sw1

1 6

Off On

3 2 2 3 Power failure detection circuit red 1 Surge absorber 2 3 1

Tb1

L3

L2

L1

2 1 INV Board °t 2

L

yellow

Cnpow

t° 6 5 4 5

Cnvdc

4

Cndc2

1

Acct2

Th7

1 5 5 4 3 1

Sw4

Led3

2 LEV5a 3

Set Up(Sw6-10)

V

M

Off

Cn506

red yellow

Cn3K

*3 Compressor ON/OFF output Error detection output

Dc12V Cn51

SV5b

W

blue

Cn3N

1 3 3 4 TB7 Power selecting connector

Cnvdc

Ipm

5 1 2 6

On

Off

M-NET power supply circuit 1 2 M-NET Board Power failure detection circuit Indoor/Outdoor transmission cable

On

1's digit

Cn102

1 4 1

U

10's digit

Off

LED2:Normal operation(Lit) / Error(Blink) yellow

Cndc

red

Ms

3~ 2

Th6

U

LED1:Power supply to Indoor/Outdoor transmission line

Znr400

Central control transmission cable

On

Off

Motor (Compressor) red

Cn3S

1

Cn04

red

Cn43

yellow

Cn61

green

Cn202

red 8 / Error(Blink) *4 2

P

63H1

4 1

Sw5

10 5

Cn3D

1 CPU power supply circuit black

Cnac2

1 *3

On

Off

10

Swu1

N

Cn212

red

W

U

P

6

Cndc1

1 4

V

1

Cn80

25

F301

Ac250V

15A T

Cnipm

Cntyp5

green LED4:CPU in operation

Ft-N

LED1:Normal operation(Lit) / Error(Blink)

Cn801

red

Swp1

Cn012

1 3 FAN Board

63Ls

U

+

Znr005

Z24

2

Cn507

black 3

F003

Ac250V

6.3A T

Tb42

6 4

X001

Cn213

green black *5

Sv9

Function setting

Led1

Display setting/ Function setting red LED4:CPU in operation 5 1

Sc-P1

Dcl

black

Cn72C

red 3 1

Dcct1

1 2 1 4 1

Cnlva

1

Cnr1

red black

F01

Ac250V

3.15A T

Tb31

R1

white red

Cnit

red

X001

1 2 Power Source 3~ 60Hz

208/230V

Cnct

red white

Acct1

5 6

Cn110

Noise filter 3 1 6 4 1 2 IPM power supply circuit

Cnfg2

Noise Filter black 4 3 2 1

Cnct2

blue 4 3 2 1

X05

X06

3 5 1 6

Cn505

1 3 1 2

Cnfg

blue 1 2 black red white *5 black red

Thhs

°t

Z26

Cntyp

2

Cnth

green 2 1

Cn110

black 2 1 red 1 2 1

Cnac

Cn81

green 1 2 5 1 3 4 4 SV4a 4

Cn2

C310,C311

SV4d SV1a SV4b 21S4a 1 2 3 4 6

M

Cnlve

yellow

Lev4

Th9

Th11

t° 2

Cn509

yellow

Cns2

3 2 3 1

X04

yellow

Cn504

Sv11

3 1

X03

green

Cn503

Sv10

Cn72C

green LED1:Normal operation(Lit)

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[4-3 Outdoor Unit Electrical Wiring Diagrams ]

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4 Electrical Components and Wiring Diagrams

(2) Pury-Hp72, Hp96Ykmu-A

For opening/closing the bypass circuit Terminal block Central control transmission cable Indoor/Outdoor transmission cable Power supply Function setting connector IPM temperature OA temperature ACC inlet pipe temperature Discharge pipe temperature Thermistor

Sv9

Tb1

Tb3

Tb7

Th4

Th5

Th6

Th7

Thhs

Z24,25

DC reactor Current sensor(AC) Magnetic relay(inverter main circuit) Low pressure Discharge pressure High pressure protection for the outdoor unit Pressure switch Pressure sensor Explanation 4-way valve(Cooling/Heating switching) For opening/closing the bypass circuit under the O/S Solenoid valve

Dcl

LEV5a

Ct12,22,3

72C

63Ls

63Hs1

63H1

Symbol 21S4a SV1a SV5b Outdoor unit heat exchanger capacity control Subcooled liquid refrigerant temperature *1. Single-dotted lines indicate wiring not supplied

with the unit. *2. Dot-dash lines indicate the control box boundaries. *3. Refer to the Data book for connecting input/output

signal connectors. *4. Daisy-chain terminals (TB3) on the outdoor units in the

same refrigerant system together. *5. Faston terminals have a locking function.

Make sure the terminals are securely locked in place

after insertion. Press the tab on the terminals to

removed them. *6. Control box houses high-voltage parts.

Before inspecting the inside of the control box,turn off

the power,keep the unit off for at least 10 minutes, and

confirm that the voltage between FT-P and FT-N on

INV Board has dropped to DC20V or less. For inrush current prevention Resistor

R1,5

Heat exchanger capacity control SV4a,b,d

L

Capacitor (inverter main circuit)

C30~C37

For current detection

Rsh01,Rsh1

Linear expansion valve (for the control of evaporating temperature) Choke coil (for high frequency noise reduction)

Lev4

For opening/closing the injection circuit For opening/closing the defrost circuit

Sv10,11

Heat exchanger outlet pipe temperature

Th9,11

1 2

L3

red

Cnps

1 3 2 1

Tp1 Tp2

Tb3

2 3

Tb7

M1 M2

M1 M2 S

1 5 1 2 3 4 1 2 t° 1 2 1 3 2 3 4 6 3 6 1 5 3 1 2 2

Cn82

blue 1 3 4

Cn83

black

L1

L2

3 1 Fan motor (Heat exchanger)

U

V

W

Cninv

7 1 4 3 4

Cn4

black 1 1 3 2 3 1 t 3

Sw001

1 4 °

Cn2

1 1 2 1 3 3 1 4 3 2 2 3 1 1

Cnsnr

Th4

t 4 ° 1 1 1

Cn211

green 2 3 1 2 3 3 2 1

U

5 Transformer Box

Cntr3

3 4

Cntr2

T02

(Transformer) 2 2 3 4

T03

(Transformer) 1 1 2 5 4 3 2 1 1 3 2 1 2 3 1 2 3 1

Cn6

2 1 °t 2 yellow

Cnpow

t° 1 6 5 4

X10

On

X08

Unit address setting

Ct12

Cn5

red

D1

R4

Z5

1 + 3 1 6

Cntr1 1

2

L1 L2 L2

3

L3

4 5 6 7 8

Rsh01

white Ground 1 2 3 4 3 white red black black white red

F4

Ac600V

6A F

F5

Ac600V

6A F

green

Cn62

Cn990

green

Cntyp4

F4

Ac250V

6.3A T

R5

Cn201

Z25

1

Th5

2

Swu2

Led1

Sw6

10 Control Board

Cn40

63Hs1

Cn41

Th7

1 5 2 3 4 1

Sw4

Led3

5 LEV5a 3 3

Set Up(Sw6-10)

Sc-V

Ct22

Sc-U

V

Cn4

blue red

M

Off

t black

Cn506

red

Cntyp2

black 6 yellow

Cn3K

*3 Compressor ON/OFF output Error detection output

Tb21

Dc12V Cn51

SV5b

Cn1A

U

Cn2

blue

Cn3N

1 3 + 3 4

Tb1

Cn1B

TB7 Power selecting connector

Cnvdc

1

Ipm

2 5 6

L3

Dcl

black

72C

white red 2 6

On

Off

M-NET power supply circuit 1 2 M-NET Board Power failure detection circuit Indoor/Outdoor transmission cable INV Board red

Tb23

L2

L1

+

On

1's digit

Thhs

Cn102

C31,C33,

C35,C37

1 4 1

W

10's digit

Off

LED2:Normal operation(Lit) / Error(Blink) yellow

Cndc

red red

Ms

3~ 2

C100

*5

Th6

U

LED1:Power supply to Indoor/Outdoor transmission line

Znr400

+ black Central control transmission cable *6

Sc-L1

On

Off

Ft-N

R30,R32,

R34

Motor (Compressor) red

Cn3S

1

Cn04

red

Cn43

1

Sc-P2

P

Cn61

green

Cn202

red

C30,C32,

C34,C36

8

N

Cn1

LED1: Normal operation(Lit) / Error(Blink) *4

Sc-W

Sc-L3

2

P

63H1

4 1

Sw5

10 5

Cn3D

1 CPU power supply circuit black

Cnac2

1 *3

On

Off

10

Swu1

white

Cn212

red

Sc-L2

6 2

Cn80

F301

Dc700V

4A T

Cntyp5

green LED4:CPU in operation LED1:Normal operation(Lit) / Error(Blink)

Cn801

red 5 °

Ipm

4

Sc-P1

Ft-P

black red

Db1

Ct3

C1

Cntyp

black black

Tb22

Swp1

Rsh1

R6

C11

FAN Board

63Ls

Znr1

U

L

Noise Filter

Z24

2

Cn507

black 3 3 6 4

Cn213

green

Cn6

yellow

Sv9

Function setting

Led1

Display setting/ Function setting

72C

Noise filter Noise filter 6 7 red Surge absorber 1 2 1

Cnlva

1

F01

Ac250V

3.15A T

Ms

3~ white black 1

Cnit

red

L1

L2

L3

R31,R33,

R35

3 4 1

R1,R5

X05

X06

3 5 1 6

Cn505

1 3

X13

SV4d

X14

X12

1 6 3

Cn508

blue 1 6 3

Cnac

Cn81

green 1 2 5 1 3 4 SV4a SV4b 4 4

Cn2

C310,C311

SV1a 21S4a 5 Power Source 3~ 60Hz

460V

1 2 3 4 6

M

Cnlve

Lev4

yellow

Th9

Th11

t° 2

Cns2

Cn509

yellow

X04

3 1 yellow

Sv11

Cn504

X03

3 1 green

Cn503

Sv10

green

Cn72

yellow

Page 111

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[4-7 BC Controller Electrical Wiring Diagrams ]

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4 Electrical Components and Wiring Diagrams (4) CMB-P1013,1016NU-G models

Znr01

Znr02

L1

L2

Tb01

M1

M2

Tb02

S(Shield)

Cn32

CN33(Red) CN34(Black) CN35(Blue) CN36(Green) CN31(Yellow) CN30(Black) CN29(Green) CN28(Blue) CN27(Red) (Red) (Blue) (Yellow)

Cn07

Cn05

Cn13

Lev1

Lev3

X21

3 1 2 1

Cnvcc1

3

Cnvcc2

3 1 2

Cont.B

Cn39

1 3 1 3 5

Cn12

Cnout3

Cnout1

1 3 1 2 3 8 7 6 5 4 3 2 1 4

Cnout2

Cnout4

6 5 4 3 2 1 6 5 4 3 2 1 1 2 3

Cnp1

1 2 3

Cnp3

2 1 1 2 3 4 5 6 7 8 4 3 2 1 1 2 3 2 1

Cn03

Cn02

Cn10

Cn11

Th11

Th12

Th15

Th16

Tr

Cn38

Cn26

3 1

Cntr

4 1 2 3 4 5 6 7 8 3 2 1

Ps1

Ps3

CN44(Yellow) CN45(Green) CN41(Green) CN43(Red) (Yellow)

Sv1B

Sv1A

Sv1C

5 6 7 8 9 10 11 12 13 14 15 16 3 2 4 8 9 10 11 12 13 3 2 4 5 6 7 14 15 16 4 3 2

Sv2C

Sv2A

Sv2B

Sv3C

Sv3A

Sv3B

Sv4C

Sv4A

Sv4B

Sv5B

Sv5A

Sv5C

4 3 2 1 4 3 2 1 4 3 2 1 4 3 2 1 4 3 2 4 3 2 1 4 3 2 1 4 3 2 1 4 3 2 1

Sv6B

Sv6A

Sv6C

1 2 3 4 1 2 3 4 3 3 2 1 2 1

X35

X11

X12

X34

X9

X10

X33

X7

X8

X32

X5

X6

X31

X3

X4

X30

X1

X2

5 3 1 7 5 3 1 7 5 3 1 7 5 3 1 7 5 3 1 7 5 3 1 1 1 1 1

Sv7A

Sv7B

Sv7C

Sv8B

Sv8A

Sv8C

Sv9B

Sv9A

Sv9C

Sv10B

Sv10A

Sv10C

16 16 13 14 15 9 10 11 12 5 6 7 8 4 4 5 6 8 7 9 12 11 10 15 14 13 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 7 5 3 1 3 3

X14

X13

X36

X37

X15

X16

X38

X39

X17

X19

X18

X20

7 5 3 1 7 5 3 1 7 5 3 1

Cn40

Svm1

2 3 2 1 3 1

Rel.B

4 5 6 8 9 7 10 12 11 13 15 14 16 3 4 2 1

Sv11B

Sv11A

Sv11C

1 3 2 8 9 10 11 12 13 3 2 4 1 5 6 7 14 15 16 4 3 2 1

Sv12C

Sv12A

Sv12B

Sv13C

Sv13A

Sv13B

Sv14C

Sv14A

Sv14B

Sv15B

Sv15A

Sv15C

4 3 2 1 4 3 2 1 4 3 2 1 4 3 2 1 4 3 2 1 4 3 2 1 4 3 2 1 4 3 2 1 4 3 2 1

Sv16B

Sv16A

Sv16C

1 2 3 4 1 2 3 4 3 4 2 1

X51

X55

X56

X52

X53

X57

X54

7 7 5 3 1 7 5 3 1

X45

X42

X43

X40

X44

X48

X47

X46

X50

X49

Cn42

5 7 7 5 3 1 7 5 3 1 5 3 1 3

X41

1 Solenoid valve

Svm1

Cont.B

Terminal block (for Transmission)

Tb02

Terminal block (for power source)

Tb01

Solenoid valve Expansion valve Thermistor sensor Transformer Name Symbol

Sv1~16A,B,C

Tr

Th11,12,15,16

Lev1,3

Ps1,3

Pressure sensor Terminal

T1~16

F01

Fuse AC250V 6.3A F Note:1.TB02 is transmission terminal block. Never connect power line to it. 2.The initial set values of switch on CONT.B are as follows.

Sw1:0

Sw2:0

Indoor Unit

G G

Pull Box

Fuse(15A)

Breaker(15A)

Power Supply

~208V-230V

60Hz

To Next

Indoor/outdoor (heat source) Transmission line 2 2 1 3 1 3

T1

T5

T4

T3

T2

T6

T10

T9

T8

T7

T11

T15

T14

T13

T12

T16

1

On

Sw4

8

Off

Sw5

Off

On

8 1

Dsa

(Blue) (Yellow) (Red) (Red) (Black) 10 1

Sw1

Sw2

F01

250Vac

6.3A F

Cmb-P1016Nu-G Only

Relay

Rel.B

BC controller Circuit board (Symbol explanation)

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[4-7 BC Controller Electrical Wiring Diagrams ]

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4 Electrical Components and Wiring Diagrams (6) CMB-P1013,1016NU-GA models

Cntr

(Red) CN41(Green)

Cn40

(Yellow) CN34(Black) CN33(Red) CN35(Blue)

Znr01

Znr02

Cn06

5 4 3 2 1

Lev2

Cn07

Cn13

Cnp1

(Blue)

Cnvcc1

(Yellow)

Cn03

M1

M2

Tb02

S(Shield)

6 5 4 3 2 1

Lev3

2 1 3

Cnvcc2

3 1 2

Cont.B

Cn39

1 3

Cnout3

Cnout1

1 3 1 2 3 1 2 3

Cnp3

2 1 1 2 3 4 5 6 7 8 4 3 2 1 1 2 3 2 1

Cn02

Cn10

Cn11

Th11

Th12

Th15

Th16

Tr

Cn38

Cn26

3 1 4 1 2 3 4 5 6 7 8 3 2 1

Ps1

Ps3

X45

X42

X43

X40

X44

X47

X46

Cn42

X41

Sv1B

Sv1A

Sv1C

5 6 7 8 9 10 11 12 13 14 15 16 3 2 4 8 9 10 11 12 13 3 2 4 5 6 7 14 15 16 4 3 2

Sv2C

Sv2A

Sv2B

Sv3C

Sv3A

Sv3B

Sv4C

Sv4A

Sv4B

Sv5B

Sv5A

Sv5C

4 3 2 1 4 3 2 1 4 3 2 1 4 3 2 1 4 3 2 4 3 2 1 4 3 2 1 4 3 2 1 4 3 2 1

Sv6B

Sv6A

Sv6C

1 2 3 4 1 2 3 4 3 3 2 1 2 1 CN31(Yellow) CN30(Black) CN29(Green) CN28(Blue) CN27(Red)

X35

X11

X12

X34

X9

X10

X33

X7

X8

X32

X5

X6

X31

X3

X4

X30

X1

X2

7 5 3 1 7 5 3 1 7 5 3 1 7 5 3 1 7 5 3 1 7 5 3 1 1 1 1 1

Sv7A

Sv7B

Sv7C

Sv8B

Sv8A

Sv8C

Sv9B

Sv9A

Sv9C

Sv10B

Sv10A

Sv10C

16 16 13 14 15 9 10 11 12 5 6 7 8 4 4 5 6 8 7 9 12 11 10 15 14 13 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4

Cn32

7 5 3 1 3 3

X14

X13

X36

X37

X15

X16

X38

X39

X17

X19

X18

X20

7 5 3 1 7 5 3 1 7 5 3 1 1 CN36(Green)

X21

CN45(Green) CN44(Yellow) CN43(Red)

Rel.B

4 5 6 8 9 7 10 12 11 13 15 14 16 3 4 2 1

Sv11B

Sv11A

Sv11C

1 3 2 8 9 10 11 12 13 3 2 4 1 5 6 7 14 15 16 4 3 2 1

Sv12C

Sv12A

Sv12B

Sv13C

Sv13A

Sv13B

Sv14C

Sv14A

Sv14B

Sv15B

Sv15A

Sv15C

4 3 2 1 4 3 2 1 4 3 2 1 4 3 2 1 4 3 2 1 4 3 2 1 4 3 2 1 4 3 2 1 4 3 2 1

Sv16B

Sv16A

Sv16C

1 2 3 4 1 3 4 3 4 2 1

X51

X55

X56

X52

X53

X57

X54

7 7 5 3 1 7 5 3 1

X48

X50

X49

5 7 7 5 3 1 7 5 3 1 5 3 1 3 1

Svm2

Svm1

3 2 2 3 1 1 2

Cn05

6 5 4 3 2 1

Lev1

L2

L1

Tb01

1 3 5

Cn12

1 2 3 8 7 6 5 4 3 2 1 4

Cnout2

Cnout4

3 3 1 CN46(Yellow)

X60

Cont.B

Terminal block (for Transmission)

Tb02

Terminal block (for power source)

Tb01

Solenoid valve Expansion valve Thermistor sensor Transformer Name Symbol

Sv1~16A,B,C

Tr

Th11,12,15,16

Lev1~3

Ps1,3

Pressure sensor

Svm1,2

T1~16

Terminal Solenoid valve

F01

Fuse AC250V 6.3A F Note:1.TB02 is transmission terminal block.Never connect power line to it. 2.The initial set values of switch on CONT.B are as follows.

Sw1:0

Sw2:0

6 Indoor/outdoor (heat source) Transmission line 2 2 1 3 1 3

T1

T5

T4

T3

T2

T6

T10

T9

T8

T7

T11

T15

T14

T13

T12

T16

Pull Box

Fuse(15A) Breaker(15A)

Indoor Unit

To Next

Power Supply

~208V-230V

60Hz

G G

1

On

Sw4

8

Off

Sw5

Off

On

8 1 (Blue)

Dsa

(Blue) (Yellow) (Red) (Black) 10 1

Sw1

Sw2

Cmb-P1016Nu-Ga Only

(Red)

F01

250Vac

6.3A F

Relay

Rel.B

BC controller Circuit board (Symbol explanation)

Page 121

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[4-7 BC Controller Electrical Wiring Diagrams ]

112 -

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(9) CMB-P1016NU-HA model

L1

L2

G

(Blue)

Cnvcc1

(Yellow)

Cn03

Cn02

2 2 3 2 3 1 1 1 3 2 1 (Black)

Cnp1

1 2 3

Tr

Cn38

1 3 CNTR(Red) 3 1

Cn26

X02

X01

X30

7 5 3 1 CN27(Red) 1 3 5 7

X31

X03

X04

CN28(Blue)

X06

X05

X32

1 3 5 7 CN29(Green)

X08

X07

X33

5 3 1 7 CN30(Black)

X10

1 3 5 7

X34

X09

CN31(Yellow)

X12

1 3

X11

X35

5 7 CN36(Green)

X21

1 3 CN46(Yellow)

X60

1 3

Cn47

X62

X61

1 3 6 5 5 3 1

Cn12

Znr02

Znr01

F01

250Vac

6.3A F

Cnout3

2 3 4 1 8 7 6 5 4 3 2 1

Cnout1

1 10

Sw2

Sw1

1 8

Off

On

8 1

Sw4

Off

On

Sw5

8 1

Sw6

Off

On

8 7 6 5

4 Cn10

3 2

Cn13

(Red) 2

Cnp3

3 2 1 1 1 3 2 1

Ps3

Ps1

Th11

Th12

Cn11

4 3 2 1

Th15

Th16

4 5 6 3 2 1 (Yellow)

Cn07

Cn05

(Red) 4 5 6 3 2 1 4 5 6 3 2 1 (Blue)

Cn06

Indoor/outdoor Transmission line

Tb02

S(Shield)

16 15 14 7 6 5 4 2 3 13 12 11 10 9 8 4 2 3 16 15 14 13 12 11 10 9 8 7 6 5 1 1 1 2 1 2 3 3

~208V-230V

Power Supply

60Hz

Breaker(16A)

Fuse(16A)

Pull Box

Indoor Unit

To Next

1 2 3 4 4 3 2 1 1 2 3 4 4 3 2 1 1 2 3 4 4 3 2 1 1 2 3 4 4 3 2 1 4 3 2 1 1 2 3 4 1 2 3 4 4 3 2 1

Cnout4

Cnout2

4 1 2 3 4 5 6 7 8 3 2 1 4 3 2 1 1 2 3 4 4 3 2 1 1 2 3 4 4 3 2 1 1 2 3 4 1 2 3 4 4 3 2 1 13 14 15 10 11 12 9 7 8 6 8 7 6 12 11 10 9 15 14 13 16 16 5 4 4 5 CN35(Blue)

X20

X19

X39

7 5 3 1 CN34(Black)

X18

X17

X38

7 5 3 1 CN33(Red)

X16

X15

X37

7 5 3 1

Cn39

Cn32

1 3 5 7

X36

X13

X14

Cnvcc2

3 2 1 3 (Blue) 1 (Yellow)

Cn40

X41

X40

X42

1 3 5 7 CN41(Green)

X44

X43

X45

Cn42

X47

X46

X48

CN43(Red)

X50

X49

X51

CN44(Yellow)

X53

X52

3 5 1 7 5 3 1 7 5 3 1 3 5 7 6 5 4 2 3 2 3 6 5 4 7 12 11 10 9 8 11 12 10 7 9 8 1 1 2 3 4 1 2

X54

CN45(Green)

X56

X55

X57

7 5 3 1 7 15 14 13 1 2 4 3 16 14 15 13 5 6 8 7 16 5 4 3 2 1 1 2 3 4 5 8 5 6 7 1 2 4 3 4 3 2 1 1 2 3 4 4 3 2 1 1 2 3 4 2 3 1 2 1 3 4 4 1 2 3 4 4 3 1 1 2 3 4 4 3 2 2 3 4 Fuse AC250V 6.3A F

F01

SVM1,2,1b,2b Solenoid valve Solenoid valve

Sv1~16A,B,C

Tb02

Terminal block (for Transmission) Terminal block (for power source)

Tb01

Cont.B

Rel.B

Tr

Th11,12,15,16

Lev1~3

Ps1,3

Symbol Name (Symbol explanation) Transformer Thermister sensor Expansion valve Pressure sensor Circuit board Relay BC controller 6 6

Cont.B

Rel.B

M2

M1

Sv1B

Sv1A

Sv1C

Sv2C

Sv2A

Sv2B

Sv3C

Sv3A

Sv3B

Sv4C

Sv4A

Sv4B

Sv5C

Sv5A

Sv5B

Sv6C

Sv6A

Sv6B

Sv10C

Sv10A

Sv10B

Sv9C

Sv9A

Sv9B

Sv8C

Sv8A

Sv8B

Sv7C

Sv7A

Sv7B

Sv11C

Sv11A

Sv11B

Sv12C

Sv12A

Sv12B

Sv13C

Sv13A

Sv13B

Sv14C

Sv14A

Sv14B

Sv15C

Sv15A

Sv15B

Sv16C

Sv16A

Sv16B

SVM2b

Svm2

Svm1

SVM1b

Tb01

T1

T2

T3

T4

T5

T6

T7

T8

T9

T10

T11

T12

T13

T14

T15

T16

T1~16

Terminal

M

Lev1

Lev2

M

Lev3

M

LD1:CPU in operation

U

Dsa

1 1 3 5 7 3

Page 124

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Chapter 5 Control 5-1 Dipswitch Functions and Factory Settings .................................................................................... 117 5-1-1 Outdoor Unit Switch Functions and Factory Settings ......................................................................... 117 5-1-2 Indoor Unit Switch Functions and Factory Settings ............................................................................ 121 5-1-3 Remote Controller Switch Functions and Factory Settings................................................................. 122 5-1-4 BC Controller Switch Settings............................................................................................................. 123 5-2 Outdoor Unit Control........................................................................................................................ 124 5-2-1 Overview............................................................................................................................................. 124 5-2-2 Rotation Control.................................................................................................................................. 124 5-2-3 Initial Control....................................................................................................................................... 124 5-2-4 Startup Control.................................................................................................................................... 124 5-2-5 Refrigerant Bypass Control................................................................................................................. 125 5-2-6 Frequency Control .............................................................................................................................. 126 5-2-7 Defrost Operation Control................................................................................................................... 127 5-2-8 ON-defrost operation control............................................................................................................... 129 5-2-9 Refrigerant Recovery Control ............................................................................................................. 129 5-2-10 Oil recovery during compressor operation at low frequency............................................................... 130 5-2-11 Outdoor Unit Fan Control.................................................................................................................... 130 5-2-12 Compressor discharge superheat control (expansion valve )................................................ 131 5-2-13 Evaporation Temperature Control (Expansion Valves )....................................................... 131 5-2-14 Control at Initial Startup ...................................................................................................................... 131 5-2-15 Emergency Operation Mode............................................................................................................... 133 5-2-16 Unit Control Scheme........................................................................................................................... 135 5-2-17 Refrigerant Circuits and Refrigerant Cycle Diagrams ......................................................................... 136 5-2-18 Operation Mode .................................................................................................................................. 137 5-2-19 Demand Control.................................................................................................................................. 138 5-3 BC Controller Control....................................................................................................................... 139 5-4 Operation Flowcharts....................................................................................................................... 140 5-4-1 Operation Sequence Flowchart .......................................................................................................... 140 5-4-2 Actions Performed in Different Modes ................................................................................................ 143

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[5-1 Dipswitch Functions and Factory Settings ]

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1) To change the settings, set SW6-10 to ON, set SW4, and press and hold SWP01 for 2 seconds or longer (OFF↔ON). LED3 will light up when the switch setting is ON, and lights off when OFF. Use the LED3 display to confirm that the settings are properly made. The settings will need to be set again when the control board is replaced. Write down the settings on the electrical wiring drawing label. 2) A: OC: Only the switch on OC needs to be set for the setting to be effective. B: OC: The switches on both the OC and OS need to be set to the same seeing for the setting to be effective. C: OC: The switches on both the OC and OS need to be set. D: OC: The switch on either the OC or OS needs to be set. 3) For details, refer to the following page(s).[5-2-7 Defrost Operation Control](page 127) 4) The table below shows how the target evaporation temperature is set with SW4 (982). 5) Unless otherwise specified, leave the switch to OFF where indicated by "-" or where the cells are blank, which may be set to OFF for a reason. 6) The settings that are configured with SW4 (SW6-10: ON) will automatically be stored on the indoor units that support the new function*. The stored settings will automatically be restored when the outdoor unit control board is replaced. If none of the connected indoor units supports the new function, no configuration information will be saved. If this is the case, manually record the settings configuration on the control box panel. *The new function is supported on most units that are manufactured in December of 2012 and later. Depending on the model, this function may be added on later date. Ask your dealer for further details. 7) The table below shows the combinations of the settings for items No.929 and No.935 and the Heating Capacity mode setting that corresponds to each combination. 8) The default settings for the setting item No.974 on the PURY-HP-TKMU-A-H series units is "ON." Set this switch to "OFF" to output error signals. When this switchis set to "OFF," base heaters cannot be used. Switch Function Function according to switch setting Switch setting timing Units that require switch setting (Note 2) OFF (LED3 Unlit) ON (LED3 Lit)

Sw4

Sw6-10:

Off

1-10

1:On, 0:Off

Self-diagnosis/operation monitor Refer to the following page(s). [9 LED Sta- tus Indicators on the Outdoor Unit Circuit Board](page 325) Anytime after power on

C

Sw4

1-10

[0:Off,

1:On]

(Note 1)

Sw6-10:On

No.769 1000000011 Test run mode: ON/OFF Stops all ICs Sends a test-run sig- nal to all IC Anytime after power on

A

No.832 0000001011 Cumulative compressor opera- tion time deletion Retained Cleared Anytime after power on (OFF→ON)

C

No.848 0000101011 ON-defrost Ineffective Effective Anytime after power on

A

No.896 0000000111 Clearance of error his- tory

Oc

Retained (IC/OC) Deleted (IC/OC) Anytime after power on (OFF→ON)

C

Os

Retained (OS) Deleted (OS) No.897 1000000111 High sensible heat operation set- ting Normal control High sensible heat operation mode After power on and before compressor startup

A

No.912 0000100111 Pump down function Normal control Pump down opera- tion After being energized and while the compres- sor is stopped

A

No.913 1000100111 Forced defrost (Note 3) Normal control Forced defrost starts 10 minutes after the completion of defrost op- eration (OFF→ON) or 10 minutes after com- pressor start-up (OFF→ON)

D

No.915 1100100111 Defrost start temperature (Note 3)

Hp72: -10°C [14°F]

Off

On

No.935

Off

Intelligent Heat Standard

On

High Heat

Sw4(982)

Off → On → Off → On → Off → On

Target evaporating temperature 0 [32 ] [32 ] [32 ] [25 ] -2 [28 ] 0 0 -4 [21 ] -6

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[5-1 Dipswitch Functions and Factory Settings ]

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5 Control 5-1-2 Indoor Unit Switch Functions and Factory Settings (1) Dipswitches

1) Sw1,3

The switch setting may vary depending on the indoor unit's type. Refer to relevant Service Handbook for details. (2) Address switch Actual indoor unit address setting varies in different systems. Refer to the installation manual for the outdoor unit for details on how to make the address setting. Each address is set with a combination of the settings for the 10's digit and 1's digit. (Example) When setting the address to "3", set the 1's digit to 3, and the 10's digit to 0. When setting the address to "25", set the 1's digit to 5, and the 10's digit to 2.

Sw3-1

Off

On

Off

On

Off

On

Off

On

Off

On

Very Low Low Preset speed Preset speed Preset speed Stop Stop Stop Stop Switch setting

Sw1-7

Sw1-8

Heating Cooling Cooling-only/heat pump Heat pump Cooling-only Heat pump Fan speed during Thermo-OFF Note 2. If both SW1-7 and SW1-8 are set to ON, the fan remains stopped during heating Thermo-OFF. To prevent incorrect temperature detection due to a build-up of warm air around the indoor unit, use the built-in temperature sensor on the remote controller (SW1-1) instead of the one on the indoor unit inlet thermistor. Note 3. By setting SW3-1, SW1-7, and SW1-8 to a certain configuration, the fan can be set to remain stopped during cooling Thermo-OFF. See the table below for details. Note 4. The settings that are configured from the remote controller will automatically be stored on the outdoor unit. The stored settings will automatically be restored when the indoor unit control board is replaced. Switch Function Function according to switch setting

Off

On

Switch setting timing Notes

Sw1

Sw3

1 2 3 4 5 6 7 8 9 10 9 10 1 2 3 4 5 6 7 8 Room temperature detection position Clogged filter detection Filter check reminder time setting Outside air intake Remote display option Humidifier control Self-recovery after power failure Fan speed setting for Heating Thermo-OFF Power source start-stop Unit model selection Louver Vane Vane swing function

Vane angle limit setting

for cooling operation Initial vane position Heating 4°C [7.2°F] up Automatic LEV value conversion function Indoor unit inlet 100h Disabled Fan output 2500h Enabled Thermo-ON signal Built-in sensor on the remote controller Available During heating operation According to the SW1-7 setting Heat pump Always on while in the heating mode Fan speed setting for Heating Thermo-OFF Very Low Low Preset speed Cooling only Enabled Enabled Disabled Disabled Enabled Enabled Not available Available Not available Available Not available Not available Available Not available Available Not available Available

-

Downblow B,C

Horizontal While the unit is stopped (Remote controller OFF) Always set to OFF on PKFY-AM model units Set to ON (built-in sensor on the remote controller) on All Fresh (PEFY-VMH-F) model units Applicable to All Fresh model units (PEFY-VMH-F) only Applicable to All Fresh model units (PEFY-VMH-F) only Always set to OFF on PKFY-VAM model units PLFY-VLMD model only Set to ON on floor-standing (PFFY) type units Note 1. Settings in the shaded areas are factory settings.(Refer to the table below for the factory setting of the switches whose factory settings are not indicated by the shaded cells.) Always set to Downblow B or C on PKFY-VAM model units Disabled SHm setting

2°C [3.6°F]

10°C [18°F]

5°C [9°F]

15°C [27°F]

The setting depends on the model and type. The setting depends on the model and type. SCm setting Disabled Forced heating operation at OA temp of 5 C or below

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[5-2 Outdoor Unit Control ]

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5-2 Outdoor Unit Control 5-2-1 Overview The outdoor units are designated as OC and OS in the order of capacity from large to small (if two or more units have the same capacity, in the order of address from small to large). The setting of outdoor unit can be verified by using the self-diagnosis switch (SW4). The OC determines the operation mode and the control mode, and it also communicates with the indoor units. The OS exercises autonomous distributed control (over defrost, error detection, and actuator control etc.) according to the operation/control mode signals that are sent from the OC. 5-2-2 Rotation Control At the initial startup, outdoor units start up in the order of "OC and OS." When the cumulative operation time of the OC reaches two hours, the OS will start up before the OC at the next start up. Startup sequence rotation is performed while all the indoor units are stopped. (Even after two hours of operation, startup se- quence rotation is not performed while the compressor is in operation.) In a system with multiple outdoor units (OC and OS), when the integrated operation time of the unit in operation (either OC or OS) reaches one hour during a cooling operation at low outside temperature, that unit will stop and the other unit will go into operation. For information about rotation control at initial startup, refer to the following page(s). [5-2-14 Control at Initial Startup](page 131) Performing startup sequence rotation does not change the basic operation of OC and OS. Only startup sequence is changed. Startup sequence of the outdoor units can be checked with the self-diagnosis switch (SW4) on the OC. 5-2-3 Initial Control When the power is turned on, the initial processing of the microcomputer is given top priority. During the initial processing, control processing of the operation signal is suspended. (The control processing is resumed after the initial processing is completed. Initial processing involves data processing in the microcomputer and initial setting of each of the LEV opening. This process will take up to 5 minutes.) During the initial processing, the LED monitor on the outdoor unit's control board displays S/W version → refrigerant type → Model and capacity → and communication address in turn every second. 5-2-4 Startup Control The upper limit of frequency during the first 3 minutes of the operation is 50 Hz. When the power is turned on, normal operation will start after the initial start-up mode (to be described later) has been com- pleted (with a restriction on the frequency).

Sw4 (Sw6-10:Off)

Display The unit is designated as the OC: "oc" appears on the display. The unit is designated as OS: "oS" appears on the display. For how to read the SW settings, refer to the following page(s). [9-1-1 How to Read the LED](page 325)

On

1 2 3 5 4 6 7 8 9 10

Sw4 (Sw6-10:Off)

Display OC→OS: "oc" and the "OC" address appear alternately on the display. OS→OC: "oS" and the "OS" address appear alternately on the display. For how to read the SW settings, refer to the following page(s). [9-1-1 How to Read the LED](page 325)

On

1 2 3 5 4 6 7 8 9 10

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[5-2 Outdoor Unit Control ]

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5 Control 5-2-8 ON-defrost operation control (1) ON-defrost operation start conditions On-defrost operation will start when all the conditions listed in the table below are met (outside temperature, cumulative com- pressor operation time, and piping temperature). SW4 (848) must be set to ON to perform ON-defrost operation. (2) Valve operation during ON-defrost cycle (3) ON-defrost operation end conditions ON-defrost operation will end when the ON-defrost operation time in the table below is reached or when the piping tempera- tures (TH9 and TH11) have remained above the temperature in the table below for three minutes. 5-2-9 Refrigerant Recovery Control Refrigerant recovery is performed for each BC port during heating operation to prevent the refrigerant from accumulating in- side the units that are stopped (in the fan mode), in the cooling mode, or in the heating Thermo-OFF mode. It is also performed during cooling operation to prevent an excessive amount of refrigerant from accumulating in the outdoor heat exchanger. Starting criteria for the refrigerant recovery cycle (during Cooling-only, Cooling-main, Heating-only, or Heating-main mode) The refrigerant recovery mode starts when all of the following conditions are met: 1) When 5 minutes have passed in the Heating-only or Heating-main mode or 30 seconds have passed in the Cooling-only or Cooling-main mode since the completion of the previous refrigerant recovery cycle AND the when following conditions are met.

Th4 > 105°C [221°F]

2) When the port is not in the 4-minute restart delay mode Starting criteria for the refrigerant recovery cycle (during Cooling-only, Cooling-main, Heating-only, or Heating-main mode) 1) When the port is in the cooling Thermo-OFF, fan, or stop mode SVC at the port turns on for 30 seconds. 2) The opening of LEV1 and LEV3 is increased. Single unit Combination units Outside temperature (TH7)

3.5°C [38.3°F] - 7.0°C[44.6°F]

Cumulative compressor operation time When 30 minutes have passed When 50 minutes have passed Piping temperature (TH6)

Th6>Th7−8°C [14°F]

Th6>Th7−10°C [18°F]

Single unit Combination units Top HEX in defrost cycle Bottom HEX in de- frost cycle Unit in defrost cycle Unit in operation Outdoor unit fan In operation In operation Stopped In operation SV1a

Off

SV5b

On

Off

On

Sv9

Off

Sv10

On

Off

On

Off

Sv11

Off

On

Off

SV4a

Off

On

Off

On

SV4b

On

Off

On

SV4d

Off

21S4a

On

Single unit Combination units ON-defrost operation time When 20 minutes have passed When 30 minutes have passed Piping temperature (TH9, TH11)

6°C [43°F]

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[5-2 Outdoor Unit Control ]

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(2) Ending the emergency operation 1) End conditions When one of the following conditions is met, emergency operation stops, and the unit makes an error stop. When the integrated operation time of compressor in cooling mode has reached four hours. When the integrated operation time of compressor in heating mode has reached two hours. When an error is detected that does not permit the unit to perform an emergency operation. 2) Control at or after the completion of emergency operation At or after the completion of emergency operation, the compressor stops, and the error code reappears on the remote con- troller. If another error reset is performed at the completion of an emergency mode, the unit repeats the procedures in section (1) above. To stop the emergency mode and perform a current-carrying operation after correcting the error, perform a power reset.

Communication circuit failure or when some of the outdoor units are turned off

This is a temporary operation mode in which the outdoor unit that is not in trouble operates when communication circuit failure occurs or when some of the outdoor units are turned off. (1) Starting the emergency operation (When the OC is in trouble) 1) When an error occurs, the error source and the error code appear on the display on the remote controller. 2) Reset the error via the remote controller to start an emergency operation. Precautions before servicing the unit When the OC is in trouble, the OS temporarily takes over the OC's function and performs an emergency operation. When this happens, the indoor unit connection information are changed. In a system that has a billing function, a message indicating that the billing system information has an error may appear on the TG-2000A. Even if this message appears, do not change (or set) the refrigerant system information on the TG-2000A. After the completion of an emergency operation, the correct connection information will be restored. (2) Starting the emergency operation (When the OS is in trouble) 1) A communication error occurs. -> An emergency operation starts in approximately six minutes. Error codes that permit an emergency operation (Applicable to both OC and OS) Emergency operation pattern (2 outdoor units) 1) If an attempt is made to put into operation a group of indoor units whose total capacity exceeds the maximum allowable ca- pacity, some of the indoor units will go into the same condition as Thermo-OFF. (3) Ending the emergency operation When communication is restored, the emergency mode is cancelled, and the units go into the normal operation mode. Trouble source Circuit board failure or the power to the outdoor units is off 6607 6608 No acknowledgement error No response error Error codes that permit an emergency operation Error code description

Oc

Cooling Heating OC failure pattern Trouble Normal Permitted Permitted Permitted Permitted Normal Trouble OS failure pattern

Os

Emergency operation Maximum total capacity of indoor units (Note 1) Capacity that matches the total capacity of the operable outdoor units

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Chapter 6 Test Run 6-1 Read before Test Run....................................................................................................................... 149 6-2 MA and ME Remote Controller Functions and Specifications ..................................................... 150 6-2-1 Function/Specification Comparison .................................................................................................... 150 6-2-2 Local Remote Controller Selection Tips.............................................................................................. 150 6-3 Making the Group and Interlock Settings from an ME Remote Controller.................................. 151 6-3-1 Overview............................................................................................................................................. 151 6-3-2 Address Registration........................................................................................................................... 151 6-3-3 Address Search .................................................................................................................................. 153 6-3-4 Address Deletion................................................................................................................................. 154 6-3-5 Making Group and Interlock Settings from Another Remote Controller.............................................. 154 6-4 Selecting Remote Controller Functions from an ME Remote Controller .................................... 155 6-5 Making Interlock Settings from an MA Remote Controller ........................................................... 157 6-5-1 MA Remote Controller (PAR-21MAAU).............................................................................................. 157 6-6 Changing the Room Temperature Detection Position .................................................................. 159 6-7 Test Run Method............................................................................................................................... 160 6-7-1 MA Remote Controller (PAR-21MAAU).............................................................................................. 160 6-8 Operation Characteristics and Refrigerant Charge....................................................................... 161 6-9 Evaluating and Adjusting Refrigerant Charge ............................................................................... 161 6-9-1 Refrigerant Overcharge and undercharge .......................................................................................... 161 6-9-2 Checking the Refrigerant Charge during Operation............................................................................ 161 6-9-3 The Amount of Refrigerant to Be Added............................................................................................. 162 6-9-4 Refrigerant Charge Adjustment Mode ................................................................................................ 164 6-10 The Following Symptoms Are Normal............................................................................................ 166 6-11 Standard Operation Data (Reference Data).................................................................................... 167 6-11-1 Single Unit (Standard)......................................................................................................................... 167 6-11-2 Dual Unit Combination (Standard)...................................................................................................... 168

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[6-1 Read before Test Run ]

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6 Test Run 6 Test Run6-1 Read before Test Run (1) Check for refrigerant leak and loose cables and connectors. (2) When opening or closing the front panel of the control box, do not let it come into contact with any of the internal components. Before inspecting the inside of the control box, turn off the power, keep the unit off for at least 10 minutes, and confirm that the capacitor voltage (inverter main circuit) has dropped to 20 VDC or less. (It takes about 10 minutes to discharge electricity after the power supply is turned off.) Control box houses high temperature parts. Be well careful even after turning off the power source. Perform the service after disconnecting the outdoor unit fan board connector (CNINV) and the inverter board connector (CN1). (To plug or unplugconnectors, check that the outdoor unit fan is not rotating and that the voltage of capacitor in the main circuit is 20 VDC or below. The capacitor may collect a charge and cause an electric shock when the outdoor unit fan rotates in windy conditions. Refer to the wiring nameplate for details.) To connect wiring to TB7, check that the voltage is 20 VDC or below. Reconnect the connector (CNINV) back to the fan board and reconnect the connector (CN1) back to the inverter board after servicing. (3) Measure the insulation resistance between the power supply terminal block and the ground with a 500V megger and make sure it reads at least 1.0Mohm. Do not operate the unit if the insulation resistance is below 1.0Mohm. Do not apply megger voltage to the terminal block for transmission line. Doing so will damage the controller board. The insulation resistance between the power supply terminal block and the ground could go down to close to 1Mohm imme- diately after installation or when the power is kept off for an extended period of time because of the accumulation of refrigerant in the compressor. If insulation resistance reads at least 1 MΩ, by turning on the main power and keeping it on for at least 12 hours, the refrigerant in the compressor will evaporate and the insulation resistance will go up. Do not measure the insulation resistance of the terminal block for transmission line for the unit remote controller. (4) When the power is turned on, the compressor is energized even while it is not operating. Before turning on the power, disconnect all power supply wires from the compressor terminal block, and measure the insula- tion resistance of the compressor. Check the compressor for a ground fault. If the insulation resistance is 1.0 MΩ or below, connect all power supply wires to the compressor and turn on the power to the outdoor unit. (The liquid refrigerant in the compressor will evaporate by energiz- ing the compressor.) (5) Make sure the valves on both the high-pressure and low-pressure sides are fully open. Securely tighten the cap. (6) Check the phase sequence and the voltage of the power supply. When the voltage is out of the ±10% range, or when the phase voltage difference is more than 2%, please discuss the coun- termeasure with the customer. (7) [When a transmission booster is connected] Turn on the transmission booster before turning on the outdoor units. If the outdoor units are turned on first, the connection information for the refrigerant circuit may not be properly recognized. In case the outdoor units are turned on before the transmission booster is turned on, perform a power reset on the outdoor units after turning on the power booster. (8) Turn on the main power at least 12 hours before test run. Insufficient powering time may result in compressor damage. (9) When a power supply unit is connected to the transmission line for centralized control(*), perform a test run with the power supply unit being energized. Leave the power jumper connector on CN41 as it is (factory setting). *Includes the cases where power is supplied to the transmission line from a system controller with a power-supply function

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[6-2 MA and ME Remote Controller Functions and Specifications ]

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6-2 MA and ME Remote Controller Functions and Specifications There are two types of remote controllers: ME remote controller, which is connected on the indoor-outdoor transmission line, and MA remote controller, which is connected to each indoor unit. 6-2-1 Function/Specification Comparison 6-2-2 Local Remote Controller Selection Tips MA remote controller and ME remote controller have different functions and characteristics. Choose the one that better suits the requirements of a given system. Use the following criteria as a reference. Functions/specifications MA remote controller*1*2 *1. MA remote controller refers to MA remote controller (PAR-20MAU, PAR-21MAAU, PAR-30MAAU), Simple MA Remote Controller, and wireless remote controller. *2. Either the MA remote controller or the ME remote controller can be connected when a group operation of units in a sys- tem with multiple outdoor units is conducted or when a system controller is connected. ME remote controller*2*3 *3. ME remote controller refers to ME remote controller and Simple ME Remote Controller. Remote controller address settings Not required Required Indoor/outdoor unit address set- tings Not required (required only by a system with one outdoor unit)*4 *4. Depending on the system configuration, some systems with one outdoor unit may require address settings. Required Wiring method Non-polarized 2-core cable ∗To perform a group operation, daisy- chain the indoor units using non-polar- ized 2-core cables. Non-polarized 2-core cable Remote controller connection Connectable to any indoor unit in the group Connectable anywhere on the indoor-out- door transmission line Interlock with the ventilation unit Each indoor unit can individually be in- terlocked with a ventilation unit. (Set up via remote controller in the group.) Each indoor unit can individually be inter- locked with a ventilation unit. (Set up via remote controller.) Changes to be made upon group- ing change MA remote controller wiring between in- door units requires rewiring. Either the indoor unit address and remote controller address must both be changed, or the registration information must be changed via MELANS. MA remote controller*1*2 ME remote controller*1*2 There is little likelihood of system expansion and group- ing changes. Grouping (floor plan) has been set at the time of instal- lation. There is a likelihood of centralized installation of remote controllers, system expansion, and grouping changes. Grouping (floor plan) has not been set at the time of in- stallation. To connect the remote controller directly to the OA pro- cessing unit. *1. ME remote controller and MA remote controller cannot both be connected to the same group of indoor units. *2. A system controller must be connected to a system to which both MA remote controller and ME remote controller are con- nected. MA remote controller Outdoor unit Indoor unit BC controller M-NET transmission line (indoor/outdoor transmission line) group group ME remote controller Outdoor unit Indoor unit BC controller M-NET transmission line (indoor/outdoor transmission line) group group

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[6-4 Selecting Remote Controller Functions from an ME Remote Controller ]

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1Hr.

Not Available

Ventilation

Stand By

Defrost

Timer

Check

[Operation Procedures]

Press the [ON/OFF] button on the remote controller to bring the unit to a stop. The display will appear as shown in the previous page (Normal

display).

Press buttons [CHECK] and [MODE] simultaneously for 2 seconds to go into the operation mode display selection mode

under the remote controller function selection mode. Press button [SET TEMP. ( )] or [SET TEMP. ( )] to go into the other three modes under the remote controller function selection mode. 2 3 Operation mode display selection mode (Display or non-display of room temperature on the remote controller.) AUTO COOL/HEAT will blink, and either ON or OFF will light up. Press button [TIMER SET ( ) or ( )] in this state to switch between ON and OFF. When it is set to ON, AUTO and COOL or AUTO and HEAT will appear on the display during automatic operation mode. When it is set to OFF, only AUTO will appear on the display during automatic operation mode. Room temperature display selection mode (Display or non-display of room temperature) Narrowed preset temperature range mode (The range of preset temperature can be changed.) When it is set to ON, the room temperature will stay in the operation display window during operation. When it is set to OFF, the room temperature will not appear in the operation display window during operation. 88 F will blink in the room temperature display window, and either ON or OFF will light up. Press button [TIMER SET ( ) or ( )] in this state to switch between ON and OFF. 1) Temperature range setting for the cooling/dry mode COOL/DRY and LIMIT TEMP. will light up in the display window, and the temperature range for the cooling/dry mode will appear on the display. The lower limit temperature will be blinking in the preset temperature display window. While it is blinking, the temperature setting can be changed. [Selection range for the lower limit temperature] : 67 F 87 F (Medium temperature range indoor unit 57 F 87 F) (The upper limit temperature is fixed at 87 F. Only the lower limit temperature is changeable.) HEAT and LIMIT TEMP will light up, and the temperature range for the heating mode will appear on the screen. The upper limit temperature can be changed with button [TIMER SET ( ) or ( )]. [Selection range for the upper limit temperature] : 63 F 83 F (Medium temperature range indoor unit 63 F 83 F) (The lower limit temperature is fixed at 63 F. Only the upper limit temperature is changeable.) [When the temperature range for the cooling or dry mode is set to 67 F to 87 F] [When the temperature range is changed to 75 F - 87 F] 2) Press button [TIMER SET ( ) or ( )] to set the lower limit temperature to the desired temperature. 3) After completing the step above, press button [SET TEMP. ( )] to go into the temperature range setting mode to set the temperature range for the heating operation.

When all the necessary settings have been made, exit the remote controller function selection mode and go back to the Normal display by

pressing and holding buttons [CHECK] and [MODE] simultaneously for 2 seconds. 1

Centrally Controlled

Daily

Auto Off

Dry Cool

Auto Fan

Heat

Remainder

Error Code

Clock

Set Temp.

Auto

On

Auto

Off

Fan

Speed

Check Mode

Filter

Sensaor

Inside

Test Run

Limit Temp.

1Hr.

Not Available

Ventilation

Stand By

Defrost

Timer

Check

Centrally Controlled

Daily

Auto Off

Dry Cool

Auto Fan

Heat

Remainder

Error Code

Clock

Set Temp.

Auto

On

Auto

Off

Fan

Speed

Check Mode

Filter

Sensaor

Inside

Test Run

Limit Temp.

1Hr.

Not Available

Ventilation

Stand By

Defrost

Timer

Check

Centrally Controlled

Daily

Auto Off

Dry Cool

Auto Fan

Heat

Remainder

Error Code

Clock

Set Temp.

Auto

On

Auto

Off

Fan

Speed

Check Mode

Filter

Sensaor

Inside

Test Run

Limit Temp.

1Hr.

Not Available

Ventilation

Stand By

Defrost

Timer

Check

Centrally Controlled

Daily

Auto Off

Dry Cool

Auto Fan

Heat

Remainder

Error Code

Clock

Set Temp.

Auto

On

Auto

Off

Fan

Speed

Check Mode

Filter

Sensaor

Inside

Test Run

Limit Temp.

1Hr.

Not Available

Ventilation

Stand By

Defrost

Timer

Check

Centrally Controlled

Daily

Auto Off

Dry Cool

Auto Fan

Heat

Remainder

Error Code

Clock

Set Temp.

Auto

On

Auto

Off

Fan

Speed

Check Mode

Filter

Sensaor

Inside

Test Run

Limit Temp.

1Hr.

Not Available

Ventilation

Stand By

Defrost

Timer

Check

[TIMER SET ( ) (( ))] button [TIMER SET ( ) (( ))] button 4 4 4 4 2 1

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[6-5 Making Interlock Settings from an MA Remote Controller ]

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6 Test Run 6-5 Making Interlock Settings from an MA Remote Controller LOSSNAY interlock setting (Make this setting only when necessary.) 6-5-1 MA Remote Controller (PAR-21MAAU) [Operation Procedures]

Without interlocked LOSSNAY settings

Search result

The indoor unit address and the interlocked LOSSNAY address will appear alternately.

Press the [ON/OFF] button on the remote controller to bring the unit to a stop. The display window on the remote controller must look like the figure below to proceed to step . NOTE: When using LOSSNAY units in conjunction, interlock the addresses of all indoor units within the group and address of LOSSNAY units. Perform this operation to enter the interlock setting between the LOSSNAY and the indoor units to which the remote controller is connected, or to search and delete registered information.

When the upper controller is connected, make the setting using the upper controller.

In the following example, the address of the indoor unit is 05 and the address of the LOSSNAY unit is 30. 2 < 1. Registration Procedures > Indoor unit address LOSSNAY address Press the [TEST] button to register the address of the selected indoor unit and the interlocked LOSSNAY unit.

Registration completed

The registered indoor unit address and IC, and the interlocked LOSSNAY address and LC will appear alternately.

Registration error

If the registration fails, the indoor unit address and the LOSSNAY address will be displayed alternately. Registration cannot be completed: The selected unit address does not have a corresponding indoor unit or a LOSSNAY unit. Registration cannot be completed: Another LOSSNAY has already been interlocked with the selected indoor unit. 1 3 2

Press and hold the [FILTER] and [ ] buttons simultaneously for two seconds to perform a search for the LOSSNAY that is interlocked with the indoor unit to which the remote controller is connected. If no settings are necessary, exit the window by pressing and holding the [FILTER] and [ ] buttons simultaneously for 2 seconds. Go to step 1. Registration Procedures to make the interlock settings with LOSSNAY units, or go to step 2. Search Procedures to search for a particular LOSSNAY unit. Go to step 3. Deletion Procedures to delete any LOSSNAY settings. To interlock an indoor unit with a LOSSNAY unit, press the [ TEMP. ( ) or ( )] button on the remote controller that is connected to the indoor unit, and select its address (01 to 50). Press the [ CLOCK ( ) or ( )] button to select the address of the LOSSNAY to be interlocked (01 to 50). 5 4 7 6

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[6-8 Operation Characteristics and Refrigerant Charge ]

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6 Test Run 6-8 Operation Characteristics and Refrigerant Charge It is important to have a clear understanding of the characteristics of refrigerant and the operating characteristics of air conditioners before attempting to adjust the refrigerant amount in a given system. The following table shows items of particular importance. 1) During cooling operation, the amount of refrigerant in the accumulator is the smallest when all indoor units are in operation. 2) During heating operation, the amount of refrigerant in the accumulator is the largest when all indoor units are in operation. 3) General tendency of discharge temperature Discharge temperature tends to rise when the system is short on refrigerant. Changing the amount of refrigerant in the system while there is refrigerant in the accumulator has little effect on the discharge temperature. The higher the pressure, the more likely it is for the discharge temperature to rise. The lower the pressure, the more likely it is for the discharge temperature to rise. 4) When the amount of refrigerant in the system is adequate, the compressor shell temperature is 10 to 60°C [18 to 108°F] higher than the low pressure saturation temperature (Te). -> If the temperature difference between the compressor shell temperature and low pressure saturation temperature (Te) is smaller than 5°C [9°F], an overcharging of refrigerant is suspected. 6-9 Evaluating and Adjusting Refrigerant Charge 6-9-1 Refrigerant Overcharge and undercharge Overcharging or undercharging of refrigerant can cause the following symptoms: Before attempting to adjust the amount of refrigerant in the system, thoroughly check the operating conditions of the system. Then, adjust the refrigerant amount by running the unit in the refrigerant amount adjust mode. 6-9-2 Checking the Refrigerant Charge during Operation Operate all indoor units in either cooling-only or heating-only mode, and check such items as discharge temperature, subcool- ing, low pressure, suction temperature, and shell bottom temperature to estimate the amount of refrigerant in the system. The system comes to an abnormal stop, displaying 1500 (overcharged refrigerant) on the controller. Overcharged refrigerant The operating frequency does not reach the set frequency, and there is a problem with performance. Insufficient refrigerant amount The system comes to an abnormal stop, displaying 1102 (abnormal discharge temper- ature) on the controller. Symptoms Conclusion Discharge temperature is high. (Normal discharge temperature is below 95°C [203°F].) Slightly under- charged refrigerant Low pressure is unusually low. Suction superheat is large. (Normal suction superheat is less than 20°C [36°F].) Compressor shell bottom temperature is high. (The difference between the compressor shell bottom temperature and low pressure saturation temperature (Te) is greater than 60°C [108°F].) Discharge superheat is small. (Normal discharge superheat is greater than 10°C [18°F].) Slightly overcharged refrigerant Compressor shell bottom temperature is low. (The difference between the compressor shell bot- tom temperature and low pressure saturation temperature (Te) is less than 5°C [9°F].)

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6-9-4 Refrigerant Charge Adjustment Mode Follow the procedures below to add or extract refrigerant as necessary depending on the operation mode. When the function switch (SW4 (922)) on the main board on the outdoor unit (OC only) is turned to ON, the unit goes into the refrigerant amount adjust mode, and the following sequence is followed. The unit will not go into the refrigerant amount adjust mode when the switch on the OS is set to ON. Operation When the unit is in the refrigerant amount adjust mode, the LEV on the indoor unit does not open as fully as it nor- mally does during cooling operation to secure subcooling. 1) Adjust the refrigerant amount based on the values of TH4, SC11, SC16, and Tc, following the flowchart below. The TH4, SC11, SC16, and Tc values can be displayed by using the self-diagnosis switch (SW4 (SW6-10: OFF)) on the control board of the OC or OS. 2) There may be cases when the refrigerant amount may seem adequate for a short while after starting the unit in the refrigerant amount adjust mode but turn out to be inadequate later on (when the refrigerant system stabilizes). When the amount of refrigerant is truly adequate. Subcool (SC11 and SC16) of the BC controller is 5°C [9°F] or above and SH on the indoor unit is between 5 and 15°C [9 and

27°F].

The refrigerant amount may seem adequate at the moment, but may turn out to be inadequate later on. Subcool (SC11 and SC16) of the BC controller is 5°C [9°F] or less and SH on the indoor unit is 5°C [9°F] or less. Wait until the Subcool (SC11 and SC16) of the BC controller reaches 5°C [9°F] or above and the SH of the indoor unit is be- tween 5 and 15°C [9 and 27°F] to determine that the refrigerant amount is adequate. SC11: Subcool of liquid refrigerant at BC controller inlet; SC16: Subcool of liquid refrigerant at BC controller outlet 3) High pressure must be at least 2.0MPa [290psi] to enable a proper adjustment of refrigerant amount to be made. 4) Refrigerant amount adjust mode automatically ends 90 minutes after beginning. When this happens, by turning off the SW4 (922) and turning them back on, the unit will go back into the refrigerant amount adjust mode. For how to read the SW settings, refer to the following page(s). [9-1-1 How to Read the LED](page 325) Self-diagnosis swithes on TH4 Self-diagnosis swithes on SC16 Use these switches to check the TH4, SC11, and SC16. Self-diagnosis swithes on SC11

On

1 2 3 4 5 6 7 8 9 10 1 2 3 4 5 6 7 8 9 10 1 2 3 4 5 6 7 8 9 10

On

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6 Test Run

Yes

Caution

Charge liquid refrigerant (as opposed to gaseous refrigerant) into the system. If gaseous refrigerant is charged into the system, the composition of the refrigerant in the cylinder will change and may result in performance loss.

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6-10 The Following Symptoms Are Normal Symptoms Remote controller display Cause The indoor unit does not start after starting cooling (heating) operation. "Cooling (heating)" icon blinks on the display. The unit cannot perform a heating (cooling) operation when other indoor units on the same refrigerant system, are performing a cooling (heating) operation. The auto vane adjusts its posi- tion by itself. Normal display After an hour of cooling operation with the auto vane in the vertical posi- tion, the vane may automatically move into the horizontal position. Louver blades will automatically move into the horizontal position while the unit is in the defrost mode, pre-heating stand-by mode, or when the thermostat triggers unit off. The fan speed changes dur- ing heating. Normal display Very Low fan speed when "Thermo-OFF.' Changes from Very Low to pre- set fan speed when "Thermo-ON" depending on pipe temperature. The fan stops during heating operation. Defrost The fan remains stopped during defrost operation. The fan keeps running after the unit has stopped. Unlit When the auxiliary heater is turned on, the fan operates for one minute after stopping to dissipate heat. The fan speed does not reach the set speed when operation switch is turned on.

Stand By

The fan operates at extra low speed for 5 minutes after it is turned on or until the pipe temperature reaches 35°C[95°F], then it operates at low speed for 2 minutes, and finally it operates at the set speed. (Pre-heating stand-by) When the main power is turned on, the display shown on the right appears on the in- door unit remote controller for 5 minutes. "HO" or "PLEASE WAIT" icons blink on the display. The system is starting up. Wait until the blinking display of "HO" or "PLEASE WAIT" go off. The drain pump keeps run- ning after the unit has stopped. Unlit The drain pump stays in operation for three minutes after the unit in the cooling mode is stopped. The drain pump is running while the unit is stopped. Unlit When drain water is detected, the drain pump goes into operation even while the unit is stopped. Outdoor unit, indoor unit, or BC controller makes noise when the operation mode is switched between Cooling and Heating. Normal display This noise is made when the refrigerant circuit is reversed and is normal. Sound of the refrigerant flow is heard from the indoor unit im- mediately after starting opera- tion. Normal display This is caused by the transient instability of the refrigerant flow and is nor- mal. Warm air sometimes comes out of the indoor units that are not in the heating mode. Normal display This is due to the fact that the LEVs on some of the indoor units are kept slightly open to prevent the refrigerant in the indoor units that are not op- erating in the heating mode from liquefying and accumulating in the com- pressor. It is part of a normal operation.

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Chapter 7 Troubleshooting Using Error Codes 7-1 Error Code and Preliminary Error Code Lists................................................................................ 175 7-2 Error Code Definitions and Solutions: Codes [0 - 999] ................................................................. 179 7-2-1 Error Code [0403] ............................................................................................................................... 179 7-3 Error Code Definitions and Solutions: Codes [1000 - 1999] ......................................................... 180 7-3-1 Error Code [1102] ............................................................................................................................... 180 7-3-2 Error Code [1301] ............................................................................................................................... 181 7-3-3 Error Code [1302] (during operation).................................................................................................. 182 7-3-4 Error Code [1302] (at startup)............................................................................................................. 183 7-3-5 Error Code [1500] ............................................................................................................................... 183 7-4 Error Code Definitions and Solutions: Codes [2000 - 2999] ......................................................... 184 7-4-1 Error Code [2500] (Models with a drain sensor) ................................................................................. 184 7-4-2 Error Code [2500] (Models with a float switch) ................................................................................... 185 7-4-3 Error Code [2502] (Models with a drain sensor) ................................................................................. 186 7-4-4 Error Code [2502] (Models with a float switch) ................................................................................... 187 7-4-5 Error Code [2503] ............................................................................................................................... 188 7-4-6 Error Code [2600] ............................................................................................................................... 189 7-4-7 Error Code [2601] ............................................................................................................................... 189 7-4-8 Error Code [2602] ............................................................................................................................... 190 7-5 Error Code Definitions and Solutions: Codes [3000 - 3999] ......................................................... 191 7-5-1 Error Code [3121] ............................................................................................................................... 191 7-6 Error Code Definitions and Solutions: Codes [4000 - 4999] ......................................................... 192 7-6-1 Error Code [4102] (TKMU).................................................................................................................. 192 7-6-2 Error Code [4102] (YKMU).................................................................................................................. 193 7-6-3 Error Code [4106] ............................................................................................................................... 194 7-6-4 Error Code [4109] ............................................................................................................................... 194 7-6-5 Error Code [4115] (TKMU).................................................................................................................. 195 7-6-6 Error Code [4115] (YKMU).................................................................................................................. 195 7-6-7 Error Code [4116] ............................................................................................................................... 196 7-6-8 Error Code [4121] ............................................................................................................................... 196 7-6-9 Error Codes [4220, 4225] Detail Code 108 (TKMU) ........................................................................... 197 7-6-10 Error Codes [4220, 4225] Detail Code 108 (YKMU)........................................................................... 198 7-6-11 Error Codes [4220, 4225] Detail Code 109 (TKMU) ........................................................................... 199 7-6-12 Error Codes [4220, 4225] Detail Code 109 (YKMU)........................................................................... 199 7-6-13 Error Codes [4220, 4225] Detail Code 110 (TKMU) ........................................................................... 200 7-6-14 Error Codes [4220, 4225] Detail Code 111 (TKMU) ........................................................................... 200 7-6-15 Error Codes [4220, 4225] Detail Code 111 (YKMU)........................................................................... 201 7-6-16 Error Codes [4220, 4225] Detail Code 131......................................................................................... 201 7-6-17 Error Code [4230] (TKMU).................................................................................................................. 202 7-6-18 Error Code [4230] (YKMU).................................................................................................................. 202 7-6-19 Error Code [4240] (TKMU).................................................................................................................. 203 7-6-20 Error Code [4240] (YKMU).................................................................................................................. 203 7-6-21 Error Codes [4250, 4255] Detail Code 101 (TKMU) ........................................................................... 204 7-6-22 Error Codes [4250, 4255] Detail Code 101 (YKMU)........................................................................... 205 7-6-23 Error Code [4250] Detail Codes 103, 106, and 107 (TKMU) .............................................................. 206 7-6-24 Error Code [4250] Detail Codes 106 and 107 (YKMU)....................................................................... 206 7-6-25 Error Codes [4250, 4255] Detail Code 104......................................................................................... 207 7-6-26 Error Codes [4250, 4255] Detail Code 105......................................................................................... 208

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7-6-27 Error Code [4260] (TKMU).................................................................................................................. 209 7-6-28 Error Code [4260] (YKMU).................................................................................................................. 209 7-7 Error Code Definitions and Solutions: Codes [5000 - 5999] ......................................................... 210 7-7-1 Error Codes [5101, 5102, 5103, 5104]................................................................................................ 210 7-7-2 Error Codes [5104, 5105, 5106, 5107, 5109, 5111]............................................................................ 211 7-7-3 Error Code [5110] (TKMU).................................................................................................................. 212 7-7-4 Error Code [5110] (YKMU).................................................................................................................. 212 7-7-5 Error Codes [5111, 5112, 5115, 5116]................................................................................................ 213 7-7-6 Error Code [5201] ............................................................................................................................... 214 7-7-7 Error Codes [5201, 5203].................................................................................................................... 214 7-7-8 Error Code [5301] Detail Code 115 (TKMU)....................................................................................... 215 7-7-9 Error Code [5301] Detail Code 115 (YKMU)....................................................................................... 215 7-7-10 Error Code [5301] Detail Code 116 (TKMU)....................................................................................... 216 7-7-11 Error Code [5301] Detail Code 117..................................................................................................... 216 7-7-12 Error Code [5301] Detail Code 118 (TKMU)....................................................................................... 217 7-7-13 Error Code [5301] Detail Code 119 (TKMU)....................................................................................... 217 7-7-14 Error Code [5301] Detail Code 119 (YKMU)....................................................................................... 218 7-7-15 Error Code [5301] Detail Code 120 (TKMU)....................................................................................... 218 7-7-16 Error Code [5301] Detail Code 120 (YKMU)....................................................................................... 219 7-7-17 Error Codes [5305] Detail Code 132................................................................................................... 219 7-7-18 Error Codes [5305] Detail Code 133................................................................................................... 220 7-7-19 Error Codes [5305] Detail Code 134................................................................................................... 221 7-7-20 Error Code [5401] ............................................................................................................................... 221 7-7-21 Error Code [5402] ............................................................................................................................... 222 7-7-22 Error Code [5403] ............................................................................................................................... 222 7-7-23 Error Code [5701] ............................................................................................................................... 222 7-8 Error Code Definitions and Solutions: Codes [6000 - 6999] ......................................................... 223 7-8-1 Error Code [6201] ............................................................................................................................... 223 7-8-2 Error Code [6202] ............................................................................................................................... 223 7-8-3 Error Code [6600] ............................................................................................................................... 224 7-8-4 Error Code [6601] ............................................................................................................................... 224 7-8-5 Error Code [6602] ............................................................................................................................... 225 7-8-6 Error Code [6603] ............................................................................................................................... 226 7-8-7 Error Code [6606] ............................................................................................................................... 226 7-8-8 Error Code [6607] Error Source Address = Outdoor Unit (OC)........................................................... 227 7-8-9 Error Code [6607] Error Source Address = BC Controller (BC).......................................................... 227 7-8-10 Error Code [6607] Error Source Address = Indoor Unit (IC) ............................................................... 228 7-8-11 Error Code [6607] Error Source Address = LOSSNAY (LC)............................................................... 229 7-8-12 Error Code [6607] Error Source Address = ME Remote Controller .................................................... 230 7-8-13 Error Code [6607] Error Source Address = System Controller ........................................................... 231 7-8-14 Error Code [6607] All Error Source Addresses................................................................................... 232 7-8-15 Error Code [6607] No Error Source Address ...................................................................................... 233 7-8-16 Error Code [6608] ............................................................................................................................... 234 7-8-17 Error Code [6831] ............................................................................................................................... 235 7-8-18 Error Code [6832] ............................................................................................................................... 236 7-8-19 Error Code [6833] ............................................................................................................................... 237 7-8-20 Error Code [6834] ............................................................................................................................... 238 7-9 Error Code Definitions and Solutions: Codes [7000 - 7999] ......................................................... 239 7-9-1 Error Code [7100] ............................................................................................................................... 239

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7 Troubleshooting Using Error Codes 7-2 Error Code Definitions and Solutions: Codes [0 - 999] 7-2-1 Error Code [0403]

Error code definition

Serial communication error

Error definition and error detection method

Serial communication error between the control board and the INV board on the compressor, and between the control board and the Fan board Detail code 1: Between the control board and the INV board Detail code 5: Between the control board and the Fan board

Cause, check method and remedy

(1) Faulty wiring Check the following wiring connections. 1) Between Control board and Fan board 2) Between Fan board and INV board (2) INV board failure, Fan board failure and Control board failure Replace the INV board or the Fan board or control board when the power turns on automatically, even if the power source is reset.

Error code definition

Panel communication error (Indoor unit)

Error definition and detection method

This error is detected when indoor units cannot successfully receive the signals from the Auto filter cleaning unit for one min- ute.

Cause, check method and remedy

For inverter-related error codes, refer to the following page(s). [8-10 Troubleshooting Inverter Problems (TKMU)](page 288) [8-11 Troubleshooting Inverter Problems (YKMU)](page 298) Control board FAN board

Cn2,Cn2A

Cn80

Cn4,Cn4A

Cn80

FAN board INV board

Cn82

Cn2

Cn83

Cn43

Cause Check method and remedy (1) Incorrect switch setting on the indoor unit cir- cuit board Check SW3-3 on the indoor unit circuit board Set SW3-3 to ON only when connecting an auto filter cleaning unit. (2) Power wire that connects the circuit board on the indoor unit and the circuit board on the cleaning unit is loose. Check the LED1 (cleaning unit circuit board (microcomputer power)). Lit: Power is supplied properly. Unlit: Check for loose or disconnected power wire between the indoor unit circuit board (CNAC) and the cleaning unit circuit board (CN3A). (3) Communication wire that connects the circuit board on the indoor unit and the circuit board on the cleaning unit is loose. Check the LED4 (cleaning unit circuit board (communication)). Blinking: Normal communication Unlit: Check for loose or disconnected communication wire be- tween the indoor unit circuit board (CN3G) and the cleaning unit circuit board (CN3G). If the LED blinks at irregular intervals (normally blinks at 0.5-sec- ond intervals), electrical interference is suspected. Check the items above, turn the power off, and turn the power back on. If the error persists, replace either the cleaning unit cir- cuit board or the indoor unit circuit board. (4) Panel transceiver circuit fault (cleaning unit) (5) Panel transceiver circuit fault (indoor unit) (6) Electrical interference on the cleaning unit's communication cable

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7-3 Error Code Definitions and Solutions: Codes [1000 - 1999] 7-3-1 Error Code [1102]

Error code definition

Discharge temperature fault

Error definition and error detection method

1) If the discharge temperature of 120 °C [248°F] or more is detected during the above operation (the first detection), the outdoor unit stops once, turns to anti-restart mode for 3 minutes, and restarts after 3 minutes automatically. 2) If the discharge temperature of 120° C [248°F] or more is detected again (the second detection) within 30 minutes after the second stop of the outdoor unit described above, the mode will be changed to 3 - minute restart mode, then the outdoor unit will restart in 3 minutes. 3) If the discharge temperature of 120°C [248°F] or more is detected (the third detection) within 30 minutes after the stop of the outdoor unit described above (regardless of the first or the second stop), the outdoor unit will make an error stop, and the error code "1102" will be displayed. 4) If the discharge temperature of 120°C [248°F] or more is detected more than 30 minutes after the previous stop of the outdoor unit, the detection is regarded as the first detection, and the operation described in step 1 above will start. 5) For 30 minutes after the stop (the first stop or the second stop) of the outdoor unit, preliminary errors will be displayed on the LED display.

Cause, check method and remedy

Cause Check method and remedy (1) Gas leak, gas shortage Refer to the following page(s).[6-9 Evaluating and Adjusting Refrigerant Charge](page 161) (2) Overload operation Check operating conditions and operation status of indoor/ outdoor units. (3) LEV failure on the indoor unit Perform a heating operation and check the operation. Cooling: LEV on the indoor unit BC controller LEV1,3

Svm1,2

Sva,C

Heating: LEV on the indoor unit BC controller LEV3

Svb

SV4a, SV4b, SV4d Refer to the following page(s). [8-8 Troubleshooting LEV Problems](page 273) (4) BC controller LEV malfunction Cooling only : LEV3 Cooling main : LEV1,3 Heating only or heating main : LEV3 Defrost : LEV3 (5) BC controller SVM1 and 2 malfunction → Cooling only or defrost (6) BC controller SVA malfunction → Cooling only or cooling main (7) BC controller SVB malfunction → Heating only or heating main (8) Solenoid valve actuation failure (SV4a, SV4b, or SV4d) →heating only, heating main (9) Port address setting error. Confirm the port address of the indoor unit. (10) Closed ball valve Confirm that the ball valve is fully open. (11) Outdoor fan (including fan parts) failure, mo- tor failure, or fan controller malfunction Rise in discharge temp. by low pressure drawing for (3) - (11). Check the fan on the outdoor unit. Refer to the following page(s). [8-7 Troubleshooting Outdoor Unit Fan Problems](page 272) (12) Gas leak between low and high pressures (4-way valve failure, Compressor failure, So- lenoid valve (SV1a) failure) Perform a cooling or heating operation and check the opera- tion. (13) Thermistor failure

(Th4)

Refer to the following page(s). [7-7-2 Error Codes [5104, 5105, 5106, 5107, 5109, 5111]](page 211) (14) Input circuit failure on the controller board thermistor Check the inlet air temperature on the LED monitor.

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7-3-3 Error Code [1302] (during operation)

Error code definition

High pressure fault 1 (Outdoor unit)

Error definition and error detection method

1) If the pressure of 3.78MPa [548psi] or higher is detected by the pressure sensor during operation (the first detection), the out- door stops once, turns to antirestart mode for 3 minutes, and restarts after 3 minutes automatically. 2) If the pressure of 3.78MPa [548psi] or higher is detected by the pressure sensor again (the second detection) within 30 min- utes after the first stop of the outdoor unit, the outdoor unit stops once, turns to anti-restart mode for 3 minutes, and restarts after 3 minutes automatically. 3) If the pressure of 3.87MPa [561psi] or higher is detected by the pressure sensor (the third detection) within 30 minutes of the second stop of the outdoor unit, the outdoor unit will make an error stop, and the error code "1302" will be displayed. 4) If the pressure of 3.78MPa [548psi] or higher is detected more than 30 minutes after the stop of the outdoor unit, the detection is regarded as the first detection, and the operation described in step 1 above will start. 5) For 30 minutes after the stop of the outdoor unit, preliminary errors will be displayed on the LED display. 6) The outdoor unit makes an error stop immediately when not only the pressure sensor but also the pressure switch detects 4.15+0,-0.15 MPa [601+0,-22 psi]

Cause, check method and remedy

Cause Check method and remedy (1) Indoor unit LEV actuation failure Perform a heating operation and check the operation. Cooling: LEV on the indoor unit BC controller LEV1,3, SVM1,1b,2,2b, SVA Heating: LEV on the indoor unit BC controller LEV3, SVM2,2b, SV4a,SV4b, SV4d Refer to the following page(s). [8-8 Troubleshooting LEV Problems](page 273) (2) BC controller LEV malfunction Heating only or heating main : Indoor LEV 3 Defrost : LEV3 (3) BC controller SVM1 and 2 malfunction →Cooling only or defrost (4) BC controller SVA and SVC malfunction →Cooling only or cooling main (5) BC controller SVB malfunction →Heating only or heating main Solenoid valve actuation failure (SV4a, SV4b, or SV4d) →Cooling only or cooling main (6) Port address setting error. Confirm the port address of the indoor unit. (7) Refrigerant service valve actuation failure Confirm that the refrigerant service valve is fully (8) Short cycle on the indoor unit side Check the indoor units for problems and correct them, if any. (9) Clogged filter on the indoor unit (10) Reduced air flow due to dirty fan on the indoor unit fan (11) Dirty heat exchanger of the indoor unit (12) Indoor fan (including fan parts) failure or motor failure Items (7) through (12) above reduce the condensing capability of the unit, resulting in high-pressure rise during heating operation. (13) Short cycle on the outdoor unit Check the outdoor units for problems and correct them, if any. (14) Dirty heat exchanger of the outdoor unit (15) Outdoor fan (including fan parts) failure, motor failure, or fan con- troller malfunction Items (13) through (15) above reduce the condensing capability of the unit, resulting in high-pressure rise during cooling operation. Check the fan on the outdoor unit. Refer to the following page(s). [8-7 Troubleshooting Outdoor Unit Fan Problems](page 272) (16) Solenoid valve (SV1a) malfunction The by-pass valve (SV1a) can not control rise in high pressure. Refer to the following page(s). [8-6 Troubleshooting Solenoid Valve Problems](page 269) (17) Thermistor failure (TH9, TH11, TH7) Refer to the following page(s). [7-7-2 Error Codes [5104, 5105, 5106, 5107, 5109, 5111]](page 211) (18) Pressure sensor failure Refer to the following page(s). [8-5-1 Comparing the High-Pressure Sensor Measurement and Gauge Pressure](page 267) (19) Failure of the thermistor input circuit and pressure sensor input circuit on the controller board Check the sensor temperature/pressure on the LED monitor. (20) Thermistor mounting problem (TH9, TH11, TH7) Check the sensor temperature/pressure on the LED monitor. (21) Disconnected male connector on the pressure switch (63H1) or disconnected wire

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7 Troubleshooting Using Error Codes 7-3-4 Error Code [1302] (at startup)

Error code definition

High pressure fault 2 (Outdoor unit)

Error definition and error detection method

If the pressure of 0.098MPa [14psi] or lower is registered on the pressure sensor immediately before start-up, it will trigger an abnormal stop, and error code "1302" will be displayed.

Cause, check method and remedy

7-3-5 Error Code [1500]

Error code definition

Refrigerant overcharge

Error definition and error detection method

An error can be detected by the discharge temperature superheat. 1) If the formula "TdSH 10°C [18°F]" is satisfied during operation (first detection), the outdoor unit stops, goes into the 3-minute restart mode, and starts up in three minutes. 2) If the formula "TdSH 10°C [18°F]" is satisfied again within 30 minutes of the first stoppage of the outdoor unit (second de- tection), the unit comes to an abnormal stop, and the error code "1500" appears. 3) If the formula "TdSH 10°C [18°F]" is satisfied 30 minutes or more after the first stoppage of the outdoor unit, the same se- quence as Item "1 above (first detection) is followed. 4) For 30 minutes after the stop of the outdoor unit, preliminary errors will be displayed on the LED display.

Cause, check method and remedy

Cause Check method and remedy (1) Inner pressure drop due to a leakage. Refer to the following page(s). [8-5-1 Comparing the High-Pressure Sensor Measurement and Gauge Pressure](page 267) (2) Pressure sensor failure (3) Shorted-circuited pressure sensor cable due to torn outer rubber (4) A pin on the male connector on the pressure sensor is missing or contact failure (5) Disconnected pressure sensor cable (6) Failure of the pressure sensor input circuit on the controller board Cause Check method and remedy (1) Overcharged refrigerant Refer to the following page(s). [6-9 Evaluating and Adjust- ing Refrigerant Charge](page 161) (2) Thermistor input circuit failure on the control board Check the temperature and pressure readings on the sen- sor that are displayed on the LED monitor. (3) Faulty mounting of thermistor (TH4) Check the temperature and pressure readings on the thermistor that are displayed on the LED monitor. (4) Solenoid valve actuation failure (SV5b) Perform a cooling or heating operation and check the oper- ation. [8-8 Troubleshooting LEV Problems](page 273) (5) Solenoid valve actuation failure (SV4a, SV4b, or SV4d) → Heating only or heating main (6) LEV5a failure→ Heating only or heating main (7) LEV4 failure→ Heating only or heating main

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7-4-3 Error Code [2502] (Models with a drain sensor)

Error code definition

Drain pump fault

Error definition and error detection method

1) Make the drain sensor thermistor self-heat. If the temperature rise is small, it is interpreted that the sensor is immersed in water. This condition is considered to be a preliminary error, and the unit goes into the 3-minute restart delay mode. 2) If another episode of the above condition is detected during the preliminary error, this is considered a drain pump error, and "2502" appears on the monitor. 3) This error is always detected while the drain pump is in operation. 4) The following criteria are met when the criteria for the forced stoppage of outdoor unit (system stoppage) are met. ∗"Liquid pipe temperature - inlet temperature -10°C [ -18 °F] " has been detected for 30 minutes. ∗The immersion of drain sensor is detected 10 consecutive times. ∗The conditions that are listed under items 1) through 3) above are always met before the criteria for the forced stoppage of the outdoor unit. 5) The indoor unit that detected the conditions that are listed in item 4) above brings the outdoor unit in the same refrigerant circuit to an error stop (compressor operation prohibited), and the outdoor unit brings all the indoor units in the same refrigerant circuit that are in any mode other than Fan or Stop to an error stop. "2502" appears on the monitor of the units that came to an error stop. 6) Forced stoppage of the outdoor unit Detection timing: The error is detected whether the unit is in operation or stopped. 7) Ending criteria for the forced stoppage of outdoor unit Power reset the indoor unit that was identified as the error source and the outdoor unit that is connected to the same refrig- erant circuit. Forced stoppage of the outdoor unit cannot be cancelled by stopping the unit via the remote controller. (Note) Items 1) - 3) and 4) - 7) are detected independently from each other. The address and attribute that appear on the remote controller are those of the indoor unit (or OA processing unit) that caused the error.

Cause, check method and remedy

Cause Check method and remedy (1) Drain pump failure Check for proper functioning of the drain pump. (2) Drain water drainage problem Clogged drain pump Clogged drain piping Check for proper drainage. (3) Adhesion of water drops to the drain sensor Trickling of water along the lead wire Rippling of drain water caused by filter clogging 1) Check for proper lead wire installation. 2) Check for clogged filter. (4) Indoor unit control board failure Drain pump drive circuit failure Drain heater output circuit failure If the above item checks out OK, replace the indoor unit control board. (5) Items (1) through (4) above and an indoor unit elec- tronic valve closure failure (leaky valve) occurred si- multaneously. Check the solenoid valves on the indoor unit for leaks.

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7 Troubleshooting Using Error Codes 7-4-4 Error Code [2502] (Models with a float switch)

Error code definition

Drain pump fault

Error definition and error detection method

1) The immersion of sensor tip in water is detected by the ON/OFF signal from the float switch. ∗Submergence of the sensor When it is detected that the float switch has been ON for 15 seconds, it is interpreted that the sensor tip is immersed in water. ∗Sensor in the air When it is detected that the float switch has been OFF for 15 seconds, it is interpreted that the sensor tip is not immersed in water. 2) If it is detected that the float switch has been ON for 3 minutes after the immersion of the sensor tip was detected, this is con- sidered a drain pump failure, and "2502" appears on the monitor. ∗The total time it takes for this error to be detected is 3 minutes and 15 seconds, including the time it takes for the first im- mersion of the sensor tip to be detected. 3) Detection of drain pump failure is performed while the unit is stopped. 4) The following criteria are met when the criteria for the forced stoppage of outdoor unit (system stoppage) are met. ∗"Liquid pipe temperature - inlet temperature

10°C [ -18°F] " has been detected for 30 minutes.

∗It is detected by the float switch that the sensor tip has been immersed in water for 15 minutes or more. ∗The conditions that are listed under items 1) through 3) above are always met before the criteria for the forced stoppage of the outdoor unit. 5) The indoor unit that detected the conditions that are listed in item 4) above brings the outdoor unit in the same refrigerant circuit to an error stop (compressor operation prohibited), and the outdoor unit brings all the indoor units in the same refrigerant circuit that are in any mode other than Fan or Stop to an error stop. 6) Forced stoppage of the outdoor unit Detection timing: The error is detected whether the unit is in operation or stopped. This error is detected whether the unit is in operation or stopped. 7) Ending criteria for the forced stoppage of outdoor unit Power reset the indoor unit that was identified as the error source and the outdoor unit that is connected to the same refrig- erant circuit. Forced stoppage of the outdoor unit cannot be cancelled by stopping the unit via the remote controller. (Note) Items 1) - 3) and 4) - 7) are detected independently from each other. The address and attribute that appear on the remote controller are those of the indoor unit (or OA processing unit) that caused the error.

Cause, check method and remedy

Cause Check method and remedy (1) Drain pump failure Check for proper functioning of the drain pump mechanism (2) Drain water drainage problem Clogged drain pump Clogged drain piping Check for proper drainage. (3) Stuck float switch Check for slime in the moving parts of the float switch. Check for normal operation of the float switch. (4) Float switch failure Check the resistance with the float switch turned on and turned off. (5) Indoor unit control board failure Drain pump drive circuit failure Float switch input circuit failure Replace indoor unit control board. (6) Items (1) through (5) above and an indoor unit electronic valve closure failure (leaky valve) occurred simultane- ously. Check the solenoid valves on the indoor unit for leaks.

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[7-6 Error Code Definitions and Solutions: Codes [4000 - 4999] ]

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7 Troubleshooting Using Error Codes 7-6-9 Error Codes [4220, 4225] Detail Code 108 (TKMU)

Error code definition

Abnormal bus voltage drop (Detail code 108)

Error definition and error detection method

If Vdc 160V or less is detected during Inverter operation. (S/W detection)

Cause, check method and remedy

(1) Power supply environment Find out if there was a (momentary) power failure. Check whether the power voltage is 188V or less across all phases. (2) Voltage drop detected 4220 Check the voltage between SC-P1 and IPM N terminals on the INV board while the inverter is stopped. → Check the following items if it is 253V or above. 1) Confirm on the LED monitor that the bus voltage is above 160 V. Replace the INV board if it is below 160 V. 2) Check the voltage at CN72C on the control board. →Go to (3). 3) Check the coil connections (L1 - L3) and coil burnout. 4) Check the resistance of the diode stack. Refer to the following page(s). [8-10-15 Troubleshooting Problems with Di- ode Stack](page 297) 5) Check the wiring connections between the following sections: Between the noise filter board and INV board. Between the INV board and C1. Replace the noise filter board if no problems are found. → Check the following items if the voltage is below 253 V. 1) Check the connection to SC-P1 and IPM N on the INV board. 2) Check the wiring between the noise filter board and INV board. 3) Check the resistance of the diode stack. Refer to the following page(s). [8-10-15 Troubleshooting Problems with Di- ode Stack](page 297) 4) Check the in-rush current resistor value. Refer to the following page(s). [8-10-13 Simple Check on Inverter Circuit Components](page 295) 5) Replace the noise filter board. 4225 Check the voltage at CNVDC on the Fan board while the inverter is stopped. →Check the following items if it is 253 V or above. 1) Check the voltage at CN72C on the control board. →Go to 3). 2) Check the coil connections (L1 - L3) and for coil burnout. 3) Check the wiring connections between noise filter board, inverter board, and fan board. Replace the noise filter board, if no problems are found. If the problem recurs after replacing the noise filter, replace the Fan board. → Check the following items if the voltage is below 253V. 4) Check the CNVDC connector connection. (3) Control board failure Confirm that a voltage of 12 VDC is applied to the connector CN72C on the control board during inverter operation. →If voltage is absent, check the fuse F01. If no problems are found, replace the control board. For inverter-related error codes, refer to the following page(s). [8-10 Troubleshooting Inverter Problems (TKMU)](page 288)

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7-6-10 Error Codes [4220, 4225] Detail Code 108 (YKMU)

Error code definition

Abnormal bus voltage drop (Detail code 108)

Error definition and error detection method

If Vdc 289V or less is detected during Inverter operation. (S/W detection)

Cause, check method and remedy

(1) Power supply environment Find out if there was a (momentary) power failure. Check whether the power voltage (Between L1 and L2, L2 and L3, and L1 and L3) is 414V or less across all phases. (2) Voltage drop detected 4220 Check the voltage between the FT-P and FT-N terminals on the INV board while the inverter is stopped and if it is 420 V or above, check the following items. 1) Confirm on the LED monitor that the bus voltage is above 289V. Replace the INV board if it is below 289 V. 2) Check the voltage at CN72 on the control board. →Go to (3). 3) Check the noise filter coil connections and for coil burnout. 4) Check the wiring connections between the following sections Between the noise filter board and INV board. Between the INV board and DCL. Replace 72C if no problems are found. 5) Check the IGBT module resistance on the INV board. Refer to the following page(s). [8-11-14 Troubleshooting Prob- lems with IGBT Module](page 305) Check the voltage between the FT-P and FT-N terminals on the INV board while the inverter is stopped and if it is less than 420 V, check the following items. 1) Check the coil connections and for coil burnout on the noise filter. 2) Check the wiring between the noise filter board and INV board. 3) Check the connection to SCP1 and SC-P2 on the INV board. 4) Check the in-rush current resistor value. 5) Check the 72C resistance value. 6) Check the DCL resistance value. Replace the INV board if no problems are found. 4225 Check the voltage at CNVDC on the Fan board while the inverter is stopped and if it is 420 V or above, check the following items. 1) Check the voltage at CN72 on the control board. →Go to 3). 2) Check the noise filter coil connections and for coil burnout. 3) Check the wiring connections between the following sections Between the noise filter board INV board and the Fan board. 4) Check contents 4220 Replace the Fan board if no problems are found. Check the voltage at CNVDC on the Fan board while the inverter is stopped and if it is less than 420 V, check the following items. 1) Check the state of the wiring connections between the INV board and the Fan board. 2) Check contents 4220 Replace the Fan board if no problems are found. (3) Control board failure Check that 12VDC is applied to connector CN72 on the control board while the inverter is operating. If voltage is absent or the wrong voltage is applied, check the fuse F01. Replace the control board if no problems are found with the fuse. For inverter-related error codes, refer to the following page(s). [8-11 Troubleshooting Inverter Problems (YKMU)](page 298)

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[7-7 Error Code Definitions and Solutions: Codes [5000 - 5999] ]

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7 Troubleshooting Using Error Codes 7-7-2 Error Codes [5104, 5105, 5106, 5107, 5109, 5111]

Error code definition

5104 Discharge temperature sensor (TH4) fault (Outdoor unit) 5105 Accumulator inlet temperature sensor (TH5) fault (Outdoor unit) 5106 Heat exchanger inlet temperature sensor (TH6) fault (Outdoor unit) 5107 Outside temperature sensor (TH7) fault (Outdoor unit) 5109 ON-defrost temperature sensor (TH9) error (outdoor unit) 5111 ON-defrost temperature sensor (TH11) error (outdoor unit)

Error definition and error detection method

When a short (high temperature intake) or an open (low temperature intake) of the thermistor is detected (the first detection), the outdoor unit stops, turns to anti-restart mode for 3 minutes, and restarts when the detected temperature of the thermistor. When a short or an open is detected again (the second detection) after the first restart of the outdoor unit, the outdoor unit stops, turns to anti-restart mode for 3 minutes, and restarts in 3 minutes when the detected temperature is within the normal range. When a short or an open is detected again (the third detection) after the previous restart of the outdoor unit, the outdoor unit makes an error stop. If a short- or open-circuited thermistor is detected immediately before restart, the unit comes to an abnormal stop, and an error code "5104""5105,""5106,""5107," "5109," or "5111" will appear on the display. During 3-minute antirestart mode, preliminary errors will be displayed on the LED display. A short or an open described above is not detected for 10 minutes after the compressor start, during defrost mode, or for 3 minutes after defrost mode.

Cause, check method and remedy

Cause Check method and remedy (1) Thermistor failure Check thermistor resistance. (2) Pinched lead wire Check for pinched lead wire. (3) Torn wire coating Check for wire coating. (4) A pin on the male connector is missing or contact failure Check connector. (5) Disconnected wire Check for wire. (6) Thermistor input circuit failure on the control board Check the intake temperature of the sensor with the LED monitor. When the temperature is far different from the actual temper- ature, replace the control board. Short detection Open detection

Th4

240°C [464°F] and above (0.57kΩ and below) 0°C [32°F] and below (698kΩ and above)

Th5

70°C [158°F] and above (0.4kΩ and below) -40°C [-40°F] and below (130kΩ and above)

Th6

70°C [158°F] and above (1.14kΩ and below) -40°C [-40°F] and below (130kΩ and above)

Th7

110°C [230°F] and above (0.4kΩ and below) -40°C [-40°F] and below (130kΩ and above)

Th9

110°C [230°F] and above (0.4kΩ and below) -40°C [-40°F] and below (130kΩ and above)

Th11

110°C [230°F] and above (0.4kΩ and below) -40°C [-40°F] and below (130kΩ and above)

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[7-8 Error Code Definitions and Solutions: Codes [6000 - 6999] ]

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7 Troubleshooting Using Error Codes 7-8-5 Error Code [6602]

Error code definition

Transmission processor hardware error

Error definition and error detection method

Although "0" was surely transmitted by the transmission processor, "1" is displayed on the transmission line. The address/attribute appeared on the display on the remote controller indicates the controller where an error oc- curred.

Cause

1) When the wiring work of or the polarity of either the indoor or outdoor transmission line is performed or is changed while the power is on, the transmitted data will collide, the wave shape will be changed, and an error will be detected. 2) Grounding fault of the transmission line 3) When grouping the indoor units that are connected to different outdoor units, the male power supply connectors on the multiple outdoor units are connected to the female power supply switch connector (CN40). 4) When the power supply unit for transmission lines is used in the system connected with MELANS, the male power supply connector is connected to the female power supply switch connector (CN40) on the outdoor unit. 5) Controller failure of the source of the error 6) When the transmission data is changed due to the noise on the transmission line 7) Voltage is not applied on the transmission line for centralized control (in case of grouped indoor units connected to different outdoor units or in case of the system connected with MELANS)

Check method and remedy

No

Tightly reconnect the male power supply connector to the female power supply switch connector (CN40).

Yes

No

Is the transmission line work performed while the power is on? Check the power source of the indoor unit.

188 / 253V?

Check the transmission line work is performed and the shielded wire is treated properly. Grounding fault or does the shielded wire contact with the transmission line? System ? Faulty power source work Improper transmission line work Turn off the power source of outdoor/indoor units, and turn them on again.

No

Investigation into the transmission line noise Noise exist? Controller failure of the source of the error *For the investigation method, follow Investigation into the cause of the noise Correct the error. System with the power supply unit for transmission lines Is the male power supply connector connected to the female power supply switch connector (CN40) on only one of the outdoor unit? Is the male power supply connector connected to the female power supply switch connector (CN40) ? Confirm that the power supply connector on the outdoor unit is not plugged into CN40. Confirm that the power supply connector on the outdoor unit is not plugged into CN40. Disconnect the male power supply on CN40 and connect it to CN41 Single-outdoor-unit system Multiple-outdoor-unit system

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7-8-14 Error Code [6607] All Error Source Addresses

Error code definition

No ACK error

Error definition and error detection method

The error is detected when no acknowledgement (ACK signal) is received after the transmission. (eg. When the data is trans- mitted six times in a row with 30 seconds interval, the error is detected on the transmission side.) The address/attribute appeared on the display on the remote controller indicates the controller which did not provide the response (ACK).

Cause, check method and remedy

(1) Troubleshooting problems for all units (A) (2) Troubleshooting problems for all units (B) (3) Troubleshooting problems for all units (C) Cause Check method and remedy (1) Disconnection or short circuit of the transmission line for the outdoor unit on the terminal block for centralized con- trol line connection (TB7) 1) Check the causes of (1) - (4). If the cause is found, correct it. If no cause is found, check 2). (2) When multiple outdoor units are connected and the pow- er source of one of the outdoor units has been shut off. 2) Check the LED displays for troubleshooting on oth- er remote controllers whether an error occurs. (3) The male power supply connector of the outdoor unit is not connected to the female power supply switch connec- tor (CN40). When an error is present Check the causes of the error indicated by the error codes listed in item (4) in the "Cause" col- umn. When no errors are present Indoor unit circuit board failure (4) The male power supply connectors on 2 or more outdoor units are connected to the female power supply switch connector (CN40) for centralized control. If an error occurs, after the unit runs normally once, the following causes may be considered. Total capacity error (7100) Capacity code error (7101) Error in the number of connected units (7102) Address setting error (7105) Cause Check method and remedy (1) Total capacity error (7100) 1) Check the LED display for troubleshooting on the outdoor unit. When an error is present Check the causes of the error indicated by the error codes listed in items (1) through (4) in the "Cause" column. When no errors are present Check the causes of the error indicated by the error codes listed in items (5) through (7) in the "Cause" column. (2) Capacity code error (7101) (3) Error in the number of connected units (7102) (4) Address setting error (7105) (5) Disconnection or short circuit of the transmission line for the outdoor unit on the terminal block for centralized con- trol line connection (TB7) (6) Turn off the power source of the outdoor unit (7) Malfunction of electrical system for the outdoor unit Cause Check method and remedy (1) When the power supply unit for transmission lines is used and the male power supply connector is connected to the female power supply switch connector (CN40) for the transmission line for centralized control Check the causes of the error indicated by the error codes listed in items (1) through (3) in the "Cause" column. (2) Disconnection or shutdown of the power source of the power supply unit for transmission line (3) System controller (MELANS) malfunction

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[7-9 Error Code Definitions and Solutions: Codes [7000 - 7999] ]

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7 Troubleshooting Using Error Codes 7-9-6 Error Code [7107]

Error code definition

Port setting error

Error definition and error detection method

The port with wrong number is connected to the indoor unit.The model total connected to the port is greater than the specifi- cation.

Cause, check method and remedy

Error source Cause Check method and remedy BC controller (1) Model total of indoor units per each port or per each port merge is greater than the specification. Before resetting the port number using the port number setting switch or the model using the model (capacity code) setting switch, turn off the power of the outdoor unit, the BC controller and the indoor unit. (2) 4 or more indoor units are connected to the same port. (3) When two ports are used, the port with the smaller number is not connected to the indoor unit. (4) For the address of the BC controller (Sub 1 or 2), 50 is not added to the smallest indoor unit address, which is connected to the BC controller (Sub1 or 2). (5) In the system to which multiple BC controllers are connected, the indoor unit address connected to the BC controller is not set as shown below. (i) The indoor unit address which is connected to the BC controller (main) (ii) The indoor unit address which is connected to the BC controller (Sub1) (iii) he indoor unit address which is connected to the BC controller (Sub2) Address setting (i)<(ii)<(iii) *(ii) and (iii) can be reversed. Model total Total port number Single branching 2 branches merge 54 96 Change the port No. Is there a BC controller (Sub)? Are 4 or more indoor units connected to the same port? Is the model total of indoor units connected to the same port greater than the item (1)? When two ports are used, is the port with the smallest number connected to the indoor unit?

Yes

No

Yes

No

For the address of the BC controller (Sub), is 50 added to the smallest indoor unit address, which is connected to the BC controller (Sub)? Is the address of the indoor unit, which is connected to the the BC controller (Main) ,smaller than that of the indoor, which is connected to the BC controller (Sub 1 or 2)?

Yes

Is the address of the indoor unit, which is connected to the the BC controller (Main), smaller than that of the indoor, which is connected to the BC controller (Sub 1 or 2)?

Yes

No

Change the port No.

No

Change the BC controller (Sub) address.

No

Change the indoor unit address or change the BC controller address

Yes

Change the port No.

Yes

Change the set indoor unit model (capacity code). Port No. setting error? Port No. setting error? The wrong model (capacity code) is set. Adjust the piping connection to the port. Adjust the piping connection to the port.

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Chapter 8 Troubleshooting Based on Observed Symptoms 8-1 MA Remote Controller Problems..................................................................................................... 251 8-1-1 The LCD Does Not Light Up. .............................................................................................................. 251 8-1-2 The LCD Momentarily Lights Up and Then Goes Off. ........................................................................ 252 8-1-3 "HO" and "PLEASE WAIT" Do Not Go Off the Screen. ...................................................................... 253 8-1-4 Air Conditioning Units Do Not Operate When the ON Button Is Pressed........................................... 254 8-2 ME remote Controller Problems...................................................................................................... 255 8-2-1 The LCD Does Not Light Up. .............................................................................................................. 255 8-2-2 The LCD Momentarily Lights Up and Then Goes Off. ........................................................................ 256 8-2-3 "HO" Does Not Go Off the Screen. ..................................................................................................... 257 8-2-4 "88" Appears on the LCD.................................................................................................................... 258 8-3 Refrigerant Control Problems.......................................................................................................... 259 8-3-1 Units in the Cooling Mode Do Not Operate at Expected Capacity...................................................... 259 8-3-2 Units in the Heating Mode Do Not Operate at Expected Capacity. .................................................... 261 8-3-3 Outdoor Units Stop at Irregular Times. ............................................................................................... 263 8-4 Checking Transmission Waveform and for Electrical Noise Interference .................................. 264 8-4-1 M-NET................................................................................................................................................. 264 8-4-2 MA Remote Controller ........................................................................................................................ 266 8-5 Pressure Sensor Circuit Configuration and Troubleshooting Pressure Sensor Problems....... 267 8-5-1 Comparing the High-Pressure Sensor Measurement and Gauge Pressure....................................... 267 8-5-2 High-Pressure Sensor Configuration (63HS1,PS1,PS3) .................................................................... 267 8-5-3 Comparing the Low-Pressure Sensor Measurement and Gauge Pressure........................................ 268 8-5-4 Low-Pressure Sensor Configuration (63LS) ....................................................................................... 268 8-6 Troubleshooting Solenoid Valve Problems.................................................................................... 269 8-7 Troubleshooting Outdoor Unit Fan Problems................................................................................ 272 8-8 Troubleshooting LEV Problems ...................................................................................................... 273 8-8-1 General Overview on LEV Operation.................................................................................................. 273 8-8-2 Possible Problems and Solutions ....................................................................................................... 275 8-8-3 Coil Removal Instructions ................................................................................................................... 276 8-9 Troubleshooting Problems with Major Components on BC Controller....................................... 277 8-9-1 Pressure Sensor ................................................................................................................................. 277 8-9-2 Temperature Sensor........................................................................................................................... 279 8-9-3 Troubleshooting Flowchart for LEVs................................................................................................... 281 8-9-4 Troubleshooting Flowchart for Solenoid Valves.................................................................................. 284 8-9-5 BC Controller Transformer.................................................................................................................. 287 8-10 Troubleshooting Inverter Problems (TKMU) .................................................................................. 288 8-10-1 Inverter-Related Problems and Solutions ........................................................................................... 288 8-10-2 Checking the Inverter Board Error Detection Circuit........................................................................... 290 8-10-3 Checking the Compressor for Ground Fault and Coil Resistance Problems...................................... 290 8-10-4 Checking the Inverter for Damage at No-Load ................................................................................... 290 8-10-5 Checking the Inverter for Damage during Compressor Operation...................................................... 291 8-10-6 Checking the Fan Motor for Ground Fault and Coil Resistance Problems ......................................... 291 8-10-7 Checking the Fan Board Error Detection Circuit at No Load .............................................................. 291 8-10-8 Checking the Fan Inverter for Damage at No Load ............................................................................ 292 8-10-9 Checking the Fan Inverter for Damage with Load .............................................................................. 293 8-10-10 Checking the Installation Conditions................................................................................................... 293 8-10-11 Solutions for the Main No-Fuse Breaker Trip...................................................................................... 294 8-10-12 Solutions for the Main Earth Leakage Breaker Trip............................................................................ 294

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8-10-13 Simple Check on Inverter Circuit Components................................................................................... 295 8-10-14 Troubleshooting Problems with Intelligent Power Module .................................................................. 296 8-10-15 Troubleshooting Problems with Diode Stack ...................................................................................... 297 8-11 Troubleshooting Inverter Problems (YKMU) .................................................................................. 298 8-11-1 Inverter-Related Problems and Solutions ........................................................................................... 298 8-11-2 Checking the Inverter Board Error Detection Circuit........................................................................... 300 8-11-3 Checking the Compressor for Ground Fault and Coil Resistance Problems...................................... 300 8-11-4 Checking the Inverter for Damage at No-Load ................................................................................... 300 8-11-5 Checking the Inverter for Damage during Compressor Operation...................................................... 301 8-11-6 Checking the Fan Motor for Ground Fault and Coil Resistance Problems ......................................... 301 8-11-7 Checking the Fan Board Error Detection Circuit at No Load .............................................................. 301 8-11-8 Checking the Fan Inverter for Damage at No Load ............................................................................ 302 8-11-9 Checking the Fan Inverter for Damage with Load .............................................................................. 303 8-11-10 Checking the Installation Conditions................................................................................................... 303 8-11-11 Solutions for the Main No-Fuse Breaker Trip...................................................................................... 304 8-11-12 Solutions for the Main Earth Leakage Breaker Trip............................................................................ 304 8-11-13 Simple Check on Inverter Circuit Components................................................................................... 305 8-11-14 Troubleshooting Problems with IGBT Module .................................................................................... 305 8-12 Control Circuit (TKMU)..................................................................................................................... 307 8-12-1 Control Power Supply Function Block................................................................................................. 307 8-12-2 Troubleshooting Problems with Outdoor Unit Transmission Power Supply Circuit ............................ 308 8-13 Control Circuit (YKMU)..................................................................................................................... 309 8-13-1 Control Power Supply Function Block................................................................................................. 309 8-13-2 Troubleshooting Problems with Outdoor Unit Transmission Power Supply Circuit ............................ 310 8-14 Measures for Refrigerant Leakage.................................................................................................. 311 8-15 Compressor Replacement Instructions.......................................................................................... 313 8-16 Solenoid Valve Block and Check Valve Replacement Instructions............................................. 315 8-17 BC Controller Maintenance Instructions ........................................................................................ 319 8-18 Troubleshooting Problems Using the LED Status Indicators on the Outdoor Unit ................... 322

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8 Troubleshooting Based on Observed Symptoms 8 Troubleshooting Based on Observed Symptoms 8-1 MA Remote Controller Problems 8-1-1 The LCD Does Not Light Up.

Phenomena

Even if the operation button on the remote controller is pressed, the display remains unlit and the unit does not start run- ning.(Power indicator ( ) is unlit and no lines appear on the remote controller.)

Cause

1) The power is not supplied to the indoor unit. The main power of the indoor unit is not on. The connector on the indoor unit board has come off. The fuse on the indoor unit board has melted. Transformer failure and disconnected wire of the indoor unit. 2) Incorrect wiring for the MA remote controller Disconnected wire for the MA remote controller or disconnected line to the terminal block. Short-circuited MA remote controller wiring Incorrect wiring of the MA remote controller cables Incorrect connection of the MA remote wiring to the terminal block for transmission line (TB5) on the indoor unit Wiring mixup between the MA remote controller cable and 208-230 VAC power supply cable Reversed connection of the wire for the MA remote controller and the M-NET transmission line on the indoor unit 3) The number of the MA remote controllers that are connected to an indoor unit exceeds the allowable range (2 units). Two PAR-31MAAU controllers are connected. 4) The length or the diameter of the wire for the MA remote controller are out of specification. 5) Short circuit of the wire for the remote display output of the outdoor unit or reversed polarity connection of the relay. 6) The indoor unit board failure 7) MA remote controller failure

Check method and remedy

1) Check the voltage at the MA remote controller terminals. If the voltage is between DC 9 and 12V, the remote controller is a failure. If no voltage is applied, check the causes 1) and 3) and if the cause is found, correct it. If no cause is found, refer to 2). 2) Disconnect the remote controller cable from TB15 (MA remote controller terminal) on the indoor unit, and check the voltage across the terminals on TB15. If the voltage is between DC 9 and 12 V, check the causes 2) and 4) and if the cause is found, correct it. If no voltage is applied, check the cause 1) and if the cause is found, correct it. If no cause is found, check the wire for the remote display output (relay polarity). If no further cause is found, replace the indoor unit board.

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8 Troubleshooting Based on Observed Symptoms 8-1-3 "HO" and "PLEASE WAIT" Do Not Go Off the Screen.

Phenomena

"HO" or "PLEASE WAIT" display on the remote controller does not disappear, and no operation is performed even if the button is pressed. ("HO" or "PLEASE WAIT" display will normally turn off 5 minutes later after the power on.)

Cause

1) The power for the M-NET transmission line is not supplied from the outdoor unit. For details, refer to the following page(s). [8-12-2 Troubleshooting Problems with Outdoor Unit Transmission Power Supply Circuit](page 308) [8-13-2 Troubleshooting Problems with Outdoor Unit Transmission Power Supply Circuit](page 310) 2) Short-circuited transmission line 3) Incorrect wiring of the M-NET transmission line on the outdoor unit. Disconnected wire for the MA remote controller or disconnected line to the terminal block. The indoor transmission line is connected incorrectly to the transmission terminal block for centralized controller (TB7). The male power supply connectors on the multiple outdoor units are connected to the female power supply switch connector

(Cn40).

In the system to which the power supply unit for transmission lines is connected, the male power supply connector is connect- ed to the female power supply switch connector (CN40) on the outdoor unit 4) Disconnected M-NET transmission line on the indoor unit. 5) Disconnected wire between the terminal block for M-NET line (TB5) of the indoor unit and the indoor unit board (CN2M) or disconnected connector. 6) Incorrect wiring for the MA remote controller Short-circuited wire for the MA remote controller Disconnected wire for the MA remote controller (No.2) and disconnected line to the terminal block. Reversed daisy-chain connection between groups Incorrect wiring for the MA remote controller to the terminal block for transmission line connection (TB5) on the indoor unit The M-NET transmission line is connected incorrectly to the terminal block (TB15) for the MA remote controller. 7) The sub/main setting of the MA remote controller is set to sub. Two PAR-31MAAU controllers are connected. 8) 2 or more main MA remote controllers are connected. 9) Indoor unit board failure (MA remote controller communication circuit) 10) Remote controller failure 11) Outdoor failure (Refer to the following page(s). [8-18 Troubleshooting Problems Using the LED Status Indicators on the Out- door Unit](page 322))

Check method and remedy

When 2) and 3) above apply, check code 7102 will be displayed on the self-diagnosis LED.

Yes

No

Yes

No

Check the self-diagnosis LED Error found? Error found? Replace the ME remote controller with the MA remote controller

17 - 30V?

Same symptom for all units in a system with one outdoor unit? Correct the error. Measure voltages of the terminal block for transmission line (TB5) on the indoor unit. Is the error code 7102 displayed? Indoor unit board or MA remote controller failure Check item 1) in the "Cause" column. Check items 2) and 3) in the "Cause" column. Check item 4) in the "Cause" column. Check items 5) and 6) in the "Cause" column.

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8-1-4 Air Conditioning Units Do Not Operate When the ON Button Is Pressed.

Phenomena

Even if the operation button on the remote controller is pressed, the indoor and the outdoor units do not start running.

Check method and remedy

Yes

Blinking? Is " " displayed on the remote controller?

No

Yes

When all wires used for grouping are disconnected, is at least one of the LED2 on the grouped indoor units lit?

Yes

Replace the MA remote controller. Is there an indoor unit on which LED2 is turned off? If operated afterwards, error 6602 or 6607 occurs. Check the voltage between the MA remote controller terminals (A and B). 9-13VDC if the voltage is applied and 0V if no voltage is applied. Is LED1 on the indoor unit control board lit? (Blinks for 2 or 3 seconds approximately every 20 seconds) Does the number of the MA remote controllers that are connected to an indoor unit exceed the allowable range (2 units)? Blinking? (Turns on momentarily approximately every 20 seconds) *After correcting the error, daisy-chain the wire for the MA remote controller again. Check for the M-NET transmission line. Replace the indoor unit control board. Connect 2 remote controllers or less. Check whether the screw on the wire is not loose. Is LED2 on the indoor unit control board blinking? When the unit is operated with the remote controller, will "ON" appear on the display? Is "Centralized" displayed? "HO"/"PLEASE WAIT" keeps blinking on the MA remote controller. Is only the power source of the indoor unit turn turned on again? DEMAND by MELANS? External thermo input setting?

(Sw3-3=On)

Does an error occur when the power is reset? Does the unit work properly when the wire for the MA remote controller is daisy-chained again? Is LED1 on the indoor unit control board lit? Does the MA remote controller work properly when it is connected to the specified indoor unit? Does an error occur when the power is reset? Running group operation with the MA remote controller? Is the unit grouped with the equipment package indoor unit? No fault with the equipment package indoor unit? Does an error occur when the power is reset? Check that no error occurs in other indoor units. Check the indoor unit on which LED2 is lit. All the indoor unit power failure? All the indoor unit power failure? Error display? Error display? Thermo is OFF? Is operation possible? Short circuit of the remote controller? After turning the power on, check whether "HO"/ "PLEASE WAIT" is displayed on the remote controller. After more than 20 seconds since turning the power on, is LED2 check of the indoor control board still displayed? Is the operation by MELANS forbidden or the input from external control equipment allowed (SWC=ON)? Is the compulsory thermo OFF (SWA) switch set to "2" or "3"? Although No.1 refrigerant circuit is normal, No.2 or No.3 refrigerant circuit remain stopped. Running group operation with the MA remote controller? Does the indoor unit make an instantaneous stop? Power supply voltage

Ac188~253V?

No

Yes

Use the wire that meets the specification. Replace the wire for the MA remote controller.

Yes

Check for the wire for the remote controller. Keep the operation.

Yes

Replace the indoor unit control board.

Yes

Power on See section 8-1-1 The LCD Does Not Light Up. See section 8-1-1 The LCD Does Not Light Up. See sections 8-1-1 The LCD Does Not Light Up and 8-1-2 The LCD Momentarily Lights Up and Then Goes Off. See section 8-1-3 "HO"and

"Please Wait"

Do Not Go Off the Screen. See section 8-1-2 The LCD Momentarily Lights Up and Then Goes Off. No.1 Refrigerant circuit check See section 8-1-2 The LCD Momentarily Lights Up and Then Goes Off. Check the malfunctioning refrigerant circuit.

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8 Troubleshooting Based on Observed Symptoms 8-2-3 "HO" Does Not Go Off the Screen.

Phenomena

"HO" display on the remote controller does not disappear, and no operation is performed even if the button is pressed.

Cause

Without using MELANS 1) Outdoor unit address is set to "00" 2) A wrong address is set. The address of the indoor unit that is connected to the remote controller is incorrect. (It should equal the ME remote controller address plus 100.) A wrong address is set to the ME remote controller. (100 must be added to the address of the indoor unit.) 3) Faulty wiring of the terminal block for transmission line (TB5) of the indoor unit in the same group with the remote controller. 4) The centralized control switch (SW5-1) on the outdoor unit is set to ON. 5) Disconnection or faulty wiring of indoor unit transmission line. 6) Disconnection between the terminal block for M-NET line connection (TB5) of the indoor unit and the male connector (CN2M) 7) The male power supply connectors on 2 or more outdoor units are connected to the female power supply switch connector (CN40) for the transmission line for centralized control. 8) Outdoor unit control board failure 9) Indoor unit control board failure 10) Remote controller failure Interlocking control with MELANS 1) No group registration is made using MELANS. (The indoor unit and the ME remote controller are not grouped.) 2) Disconnected transmission line for centralized control (TB7) of the outdoor unit 3) The male power supply connector is connected to CN40 on more than one outdoor unit, or the connector is connected to CN40 on the outdoor unit in the system to which a power supply unit for transmission line is connected. Using MELANS 1) When MELANS is used, "HO" display on the remote controller will disappear when the indoor unit and the local remote con- troller (ME remote controller) are grouped. If "HO" does not disappear after the registration, check items 1) through 3) in the "Cause" column of the section on interlocked control with MELANS.

Check method and remedy

Yes

No

*1 *1. When the indoor unit address is set to 1 - 50, the address will be forcibly set to 100.

No

Without using MELANS Are all the units in the system experiencing the same problem? Check the address of the outdoor unit. 51 - 100? Check the centralized centralized switch (SW5-1) on the outdoor unit.

On?

Indoor unit control board failure A wrong address is set to the outdoor unit. Wrong switch setting Change it from ON to OFF. A wrong address is set to the ME remote controller. A wrong address is set to the indoor unit. Wrong wiring of the M-NET transmission line of the indoor unit Disconnected connector (CN2M) Correct the error. Disconnected?

17 - 30V?

ME remote controller

100?

Check the address of the indoor unit to be coupled. Indoor unit + 100? Check the address of the ME remote controller on which "HO" is displayed. Check connection between indoor M-NET transmission terminal block (TB5) and the male connector (CN2M) Measure voltages of the terminal block for M-NET transmission line on the indoor unit. Indoor unit board or remote controller failure

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[8-3 Refrigerant Control Problems ]

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8 Troubleshooting Based on Observed Symptoms 8-3 Refrigerant Control Problems 8-3-1 Units in the Cooling Mode Do Not Operate at Expected Capacity.

Phenomena

Although cooling operation starts with the normal remote controller display, the capacity is not enough

Cause, check method and remedy

Cause Check method and remedy

Compressor frequency does not rise sufficiently.

Faulty detection of pressure sensor. Protection works and compressor frequency does not rise due to high discharge temperature Protection works and compressor frequency does not rise due to high pressure Pressure drops excessively. (1) Check pressure difference between the detected pressure by the pressure sensor and the actual pres- sure with self-diagnosis LED. → If the accurate pressure is not detected, check the pressure sensor. Refer to the following page(s). [8-5-1 Comparing the High-Pressure Sensor Measurement and Gauge Pressure](page 267) Note: Lower inlet pressure by the low pressure sensor than the actual pressure causes insufficient capacity. SW4 setting (SW6-10: OFF) For how to read the SW settings, refer to the follow- ing page(s). [9-1-1 How to Read the LED](page 325) (2) Check temperature difference between the evaporat- ing temperature (Te) and the target evaporating tem- perature (Tem) with self-diagnosis LED. Note: Higher Te than Tem causes insufficient capacity. SW4 setting (SW6-10: OFF) For how to read the SW settings, refer to the follow- ing page(s). [9-1-1 How to Read the LED](page 325) Note: Protection works and compressor frequency does not rise even at higher Te than Tem due to high discharge temperature and high pressure. At high discharge temperature: Refer to the following page(s).[7-3-1 Error Code [1102]](page 180) At high pressure: Refer to the following page(s). [7-3-3 Error Code [1302] (during operation)](page 182)

Indoor unit LEV malfunction

Refer to the following page(s).[8-8 Troubleshooting LEV Problems](page 273) Insufficient refrigerant flows due to LEV malfunc- tion (not enough opening) or protection works and compressor frequency does not rise due to pres- sure drop. Refrigerant leak from LEV on the stopping unit causes refrigerant shortage on the running unit. High pressure sensor Low pressure sensor

On

1 2 3 4 5 6 7 8 9 10

On

1 2 3 4 5 6 7 8 9 10

Sw4

1 2 3 4 5 6 7 8 9 10 Evaporating temperature Te Target evaporating temperature Tem

On

1 2 3 4 5 6 7 8 9 10

On

Sw4

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[8-5 Pressure Sensor Circuit Configuration and Troubleshooting Pressure Sensor Problems ]

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8 Troubleshooting Based on Observed Symptoms 8-5 Pressure Sensor Circuit Configuration and Troubleshooting Pressure Sensor Problems 8-5-1 Comparing the High-Pressure Sensor Measurement and Gauge Pressure By configuring the digital display setting switch (SW4 (when SW6-10 is set to OFF)) as shown in the figure below, the pressure as measured by the high-pressure sensor appears on the LED1 on the control board. (1) While the sensor is stopped, compare the gauge pressure and the pressure displayed on self-diagnosis LED1. 1) When the gauge pressure is between 0 and 0.098MPa [14psi], internal pressure is caused due to gas leak. 2) When the pressure displayed on self-diagnosis LED1 is between 0 and 0.098MPa [14psi], the connector may be defective or be disconnected. Check the connector and go to (4). 3) When the pressure displayed on self-diagnosis LED1 exceeds 4.15MPa [601psi], go to (3). 4) If other than 1), 2) or 3), compare the pressures while the sensor is running. Go to (2). (2) Compare the gauge pressure and the pressure displayed on self-diagnosis LED1 while the sensor is running. (Com- pare them by MPa [psi] unit.) 1) When the difference between both pressures is within 0.098MPa [14psi], both the high pressure sensor and the control board are normal. 2) When the difference between both pressures exceeds 0.098MPa [14psi], the high pressure sensor has a problem. (perfor- mance deterioration) 3) When the pressure displayed on self-diagnosis LED1 does not change, the high pressure sensor has a problem. (3) Remove the high pressure sensor from the control board to check the pressure on the self-diagnosis LED1. 1) When the pressure displayed on self-diagnosis LED1 is between 0 and 0.098MPa [14psi], the high pressure sensor has a problem. 2) When the pressure displayed on self-diagnosis LED1 is approximately 4.15MPa [601psi], the control board has a problem. (4) Remove the high pressure sensor from the control board, and short-circuit between the No.2 and 3 connectors (63HS1) to check the pressure with self-diagnosis LED1. 1) When the pressure displayed on the self-diagnosis LED1 exceeds 4.15MPa [601psi], the high pressure sensor has a problem. 2) If other than 1), the control board has a problem. 8-5-2 High-Pressure Sensor Configuration (63HS1,PS1,PS3) The high pressure sensor consists of the circuit shown in the figure below. If DC 5V is applied between the red and the black wires, voltage corresponding to the pressure between the white and the black wires will be output, and the value of this voltage will be converted by the microcomputer. The output voltage is 0.071V per 0.098MPa [14psi]. The pressure sensor on the body side is designed to connect to the connector. The connector pin number on the body side is different from that on the control board side. For how to read the SW settings, refer to the following page(s). [9-1-1 How to Read the LED](page 325) 1 2 3 4 5 6 7 8 9 10

On

Sw4

Body side Control board side Vcc Pin 1 Pin 3 Vout Pin 2 Pin 2

Gnd

Pin 3 Pin 1 0 0.5 [73] 1.0 [145] 1.5 [218] 2.0 [290] 2.5 [363] 3.0 [435] 3.5 [508] 4.0 [580] 4.5 [653] 0 0.5 1 1.5 2 2.5 3 3.5

Output voltage (V)

Pressure (MPa [psi]) Connector

63Hs1

1 2 3 1 2 3 GND (Black) Vout (White) Vcc (DC 5 V)(Red) Pressure 0 ~ 4.15 MPa [601psi] Vout 0.5 ~ 3.5 V 0.071 V / 0.098 MPa [14 psi]

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8-5-3 Comparing the Low-Pressure Sensor Measurement and Gauge Pressure By configuring the digital display setting switch (SW4 (when SW6-10 is set to OFF)) as shown in the figure below, the pressure as measured by the low-pressure sensor appears on the LED1 on the control board. (1) While the sensor is stopped, compare the gauge pressure and the pressure displayed on self-diagnosis LED1. 1) When the gauge pressure is between 0 and 0.098MPa [14psi], internal pressure is caused due to gas leak. 2) When the pressure displayed on self-diagnosis LED1 is between 0 and 0.098MPa [14psi], the connector may be defective or be disconnected. Check the connector and go to (4). 3) When the pressure displayed on self-diagnosis LED1 exceeds 1.7MPa [247psi], go to (3). 4) If other than 1), 2) or 3), compare the pressures while the sensor is running. Go to (2). (2) Compare the gauge pressure and the pressure displayed on self-diagnosis LED1 while the sensor is running.(Com- pare them by MPa [psi] unit.) 1) When the difference between both pressures is within 0.03MPa [4psi], both the low pressure sensor and the control board are normal. 2) When the difference between both pressures exceeds 0.03MPa [4psi], the low pressure sensor has a problem. (performance dete- rioration) 3) When the pressure displayed on the self-diagnosis LED1 does not change, the low pressure sensor has a problem. (3) Remove the low pressure sensor from the control board to check the pressure with the self-diagnosis LED1 display. 1) When the pressure displayed on the self-diagnosis LED1 is between 0 and 0.098MPa [14psi], the low pressure sensor has a problem. 2) When the pressure displayed on self-diagnosis LED1 is approximately 1.7MPa [247psi], the control board has a problem. When the outdoor temperature is 30°C [86°F] or less, the control board has a problem. When the outdoor temperature exceeds 30°C [86°F], go to (5). (4) Remove the low pressure sensor from the control board, and short-circuit between the No.2 and 3 connectors (63LS:CN202) to check the pressure with the self-diagnosis LED1. 1) When the pressure displayed on the self-diagnosis LED1 exceeds 1.7MPa [247psi], the low pressure sensor has a problem. 2) If other than 1), the control board has a problem. (5) Remove the high pressure sensor (63HS1) from the control board, and insert it into the connector for the low pres- sure sensor (63LS) to check the pressure with the self-diagnosis LED1. 1) When the pressure displayed on the self-diagnosis LED1 exceeds 1.7MPa [247psi], the control board has a problem. 2) If other than 1), the control board has a problem. 8-5-4 Low-Pressure Sensor Configuration (63LS) The low pressure sensor consists of the circuit shown in the figure below. If DC5V is applied between the red and the black wires, voltage corresponding to the pressure between the white and the black wires will be output, and the value of this voltage will be converted by the microcomputer. The output voltage is 0.173V per 0.098MPa [14psi]. The pressure sensor on the body side is designed to connect to the connector. The connector pin number on the body side is different from that on the control board side. For how to read the SW settings, refer to the following page(s). [9-1-1 How to Read the LED](page 325) 1 2 3 4 5 6 7 8 9 10

On

Sw4

Body side Control board side Vcc Pin 1 Pin 3 Vout Pin 2 Pin 2

Gnd

Pin 3 Pin 1 0 0.2 [29] 0.4 [58] 0.6 [87] 0.8 [116] 1.0 [145] 1.2 [174] 1.4 [203] 1.6 [232] 1.8 [261] 0 0.5 1 1.5 2 2.5 3 3.5

Output voltage (V)

Pressure (MPa [psi]) Connector

63Ls

1 2 3 1 2 3 GND (Black) Vout (White) Vcc (DC 5 V)(Red) Pressure 0 ~ 1.7 MPa [247psi] Vout 0.5 ~ 3.5 V 0.173 V / 0.098 MPa [14 psi]

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8 Troubleshooting Based on Observed Symptoms 8-6 Troubleshooting Solenoid Valve Problems Check whether the output signal from the control board and the operation of the solenoid valve match. Setting the self-diagnosis switch (SW4) as shown in the figure below causes the ON signal of each relay to be output to the LED's. Each LED shows whether the relays for the following parts are ON or OFF. LEDs light up when relays are on. The circuits on some parts are closed when the relays are ON. Refer to the following instructions. For how to read the SW settings, refer to the following page(s). [9-1-1 How to Read the LED](page 325) When a valve malfunctions, check if the wrong solenoid valve coil is not attached the lead wire of the coil is not disconnected, the connector on the board is not inserted wrongly, or the wire for the connector is not disconnected. (1) In case of 21S4a (4-way switching valve) About this 4-way valve When not powered: Conducts electricity between the oil separator outlet and heat exchanger AND the gas ball valve (BV1) and the accumulator to com- plete the circuit for the cooling cycle. When powered: The electricity runs between the oil separator and the gas ball valve, and between the heat exchanger and the accumulator. This circulation is for heating. Check the LED display and the intake and the discharge temperature for the 4-way valve to check whether the valve has no faults and the electricity runs between where and where.Do not touch the pipe when checking the temperature, as the pipe on the oil sep- arator side will be hot. Do not give an impact from outside, as the outer hull will be deformed leading to the malfunction of the inner valve. (2) In case of SV1a (Bypass valve) This solenoid valve opens when powered (Relay ON). 1) At compressor start-up, the SV1a turns on for 4 minutes, and the operation can be checked by the self-diagnosis LED display and the closing sound. 2) To check whether the valve is open or closed, check the change of the SV1a downstream piping temperature while the valve is being powered.Even when the valve is closed, high-temperature refrigerant flows inside the capillary next to the valve. (Therefore, temperature of the downstream piping will not be low with the valve closed.) (3) SV4a, 4b, and 4d (HP72, HP96 models)(Controls heat exchanger capacity) 1) Depending on the conditions during Cooling-only operation, at least one of the solenoid valves among SV4a through 4d turns on. Check for proper operation on the LED and by listening for the operation sound of the solenoid valve. 2) During Heating-only operation, SV4a through 4d all turn on. Check for proper operation on the LED and by listening for the operation sound of the solenoid valves. 3) Depending on the conditions during Cooling-main or Heating-main operation, at least one of the solenoid valves among SV4a through 4d turns on. Check for proper operation on the LED and by listening for the operation sound of the solenoid valve. 4) The diagram on the next page shows the refrigerant flow. This diagram shows the flow of the high-temperature (high-pressure) gas refrigerant in the Cooling-only and Cooling-main modes and the flow of the low-temperature gas/liquid refrigerant in the Heating-only and Heating-main modes. Refer to the refrigerant circuit diagram. Solenoid valves turns on and off according to such factors as the capacity of the indoor units in operation and outside temperature. Check the LED. Remove the SV coil, open the lid, and check the plunger. The type of pin face wrench that is listed in the service parts list is required to perform this task.

Sw4 (Sw6-10:Off)

Display

Ld1

Ld2

Ld3

Ld4

Ld5

Ld6

Ld7

Ld8

Upper 21S4a

Sv10

SV1a

Sv11

Lower SV5b Upper SV4a SV4b SV4d

Sv9

Lower 1 2 3 4 5 6 7 8 9 10

On

Sw4

On

Sw4

1 2 3 4 5 6 7 8 9 10

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8 Troubleshooting Based on Observed Symptoms 8-8-2 Possible Problems and Solutions Malfunction mode Judgment method Remedy Microcomputer driver circuit fail- ure Disconnect the control board connector and connect the check LED as shown in the figure below. resistance : 0.25W 1kΩ LED : DC15V 20mA or more When the main power is turned on, the indoor unit circuit board out- puts pulse signals to the indoor unit LEV for 10 seconds. If any of the LED remains lit or unlit, the drive circuit is faulty. When the drive circuit has a problem, replace the control board. LEV mechanism is locked If the LEV is locked, the drive motor runs idle, and makes a small clicking sound. When the valve makes a closing and opening sound, the valve has a problem. Replace the LEV. Disconnected or short-circuited LEV motor coil If the resistance between the coils on indoor and BC controller LEVs (Indoor unit LEV: red-white, red-orange, brown-yellow, and brown- blue; BC controller LEV: red-white, red-orange, red-yellow, and red- blue) as measured with a tester is in the range of 150 Ω ±10% (in- door unit LEV) or , 100 Ω ±10% (BC controller LEV), the LEVs are normal. Replace the LEV coils. Measure resistance between the coils (red - white, red -orange, brown - yellow, brown - blue) using a tester. They are normal if re- sistance is 150Ω ± 3%. Replace the LEV coils. Incomple sealing (leak from the valve) When checking the refrigerant leak from the indoor LEV, run the tar- get indoor unit in the fan mode, and the other indoor units in the cool- ing mode. Then, check the liquid temperature (TH22) with the self- diagnosis LED. When the unit is running in the fan mode, the LEV is fully closed, and the temperature detected by the thermistor is not low. If there is a leak, however, the temperature will be low. If the temperature is extremely low compared with the inlet temperature displayed on the remote controller, the LEV is not properly sealed, however, if there is a little leak, it is not necessary to replace the LEV when there are no effects to other parts. If there is a large amount of leakage, replace the LEV. Faulty wire con- nections in the connector or faulty contact

Check for loose pins on the connector and check the colors of

the lead wires visually Check the continuity at the points where an error occurs.

Disconnect the control board's connector and conduct a con-

tinuity check using a tester. 6 5 4 3 2 1 1 k

Led

Thermistor (liquid piping temperature detection) Linear Expansion Valve

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[8-10 Troubleshooting Inverter Problems (TKMU) ]

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8-10 Troubleshooting Inverter Problems (TKMU) 8-10-1 Inverter-Related Problems and Solutions Replace only the compressor if only the compressor is found to be defective. (Overcurrent will flow through the inverter if the compressor is damaged, however, the power supply is automatically cut when overcurrent is detected, protecting the inverter from damage.) Replace only the fan motor if only the fan motor is found to be defective. (Overcurrent will flow through the inverter if the fan motor is damaged, however, the power supply is automatically cut when overcurrrent is detected, protecting the inverter from damage.) Replace the defective components if the inverter is found to be defective. If both the compressor and the inverter are found to be defective, replace the defective component(s) of both devices. (1) Inverter-related problems: Troubleshooting and remedies 1) The INV board has a large-capacity electrolytic capacitor, in which residual voltage remains even after the main power is turned off, posing a risk of electric shock. Before inspecting the inverter-related items, turn off the main power, wait for 5 to 10 minutes, and confirm that the voltage at both ends of the electrolytic capacitor has dropped to a sufficiently low level. 2) Disconnect the outdoor unit fan board connector (CNINV) before performing maintenance work. (To plug or unplugconnec- tors, check that the outdoor unit fan is not rotating and that the voltage of capacitor in the main circuit is 20 VDC or below. The capacitor may collect a charge and cause an electric shock when the outdoor unit fan rotates in windy conditions. Refer to the wiring nameplate for details.) 3) To connect wiring to TB7, check that the voltage is 20 VDC or below. 4) Reconnect the connector (CNINV) to the fan board after completion of maintenance work. 5) The IPM on the inverter becomes damaged if there are loose screws are connectors. If a problem occurs after replacing some of the parts, mixed up wiring is often the cause of the problem. Check for proper connection of the wiring, screws, connectors, and Faston terminals. 6) To avoid damage to the circuit board, do not connect or disconnect the inverter-related connectors with the main power turned on. 7) Current sensors become damaged if electricity is passed through without them being connected to the circuit board. Connect the current sensor to the appropriate connectors on the circuit board before operating the inverter. 8) Faston terminals have a locking function. Make sure the terminals are securely locked in place after insertion. 9) When the IPM, diode stack, or IGBT is replaced, apply a thin layer of heat radiation grease that is supplied evenly to these parts. Wipe off any grease that may get on the wiring terminal to avoid terminal contact failure. 10) Faulty wiring to the compressor damages the compressor. Connect the wiring in the correct phase sequence. 11) When the power is turned on, the compressor is energized even while it is not operating. Before turning on the power, dis- connect all power supply wires from the compressor terminal block, and measure the insulation resistance of the compressor. Check the compressor for a graound fault. If the insulation resistance is 1.0 MΩ or below, connect all power supply wires to the compressor and turn on the power to the outdoor unit. (The liquid refrigerant in the compressor will evaporate by energiz- ing the compressor.) Press the tab on the terminals to remove them.

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8 Troubleshooting Based on Observed Symptoms Error display/failure condition Measure/inspection item [1] Inverter related errors 4250, 4255, 4220, 4225, 4230, 4240, 4260, 5301, 5305, 0403 Implement solutions that correspond to the error codes or preliminary error codes.[7-1 Error Code and Preliminary Error Code Lists](page 175) [2] Main power breaker trip <1> Check the breaker capacity. <2> Check whether the electrical system is short-circuited or ground-faulted. <3> If <1> or <2> is not the cause of the problem, refer to the following page(s). [8- 10-11 Solutions for the Main No-Fuse Breaker Trip](page 294) [3] Main power earth leakage breaker trip <1> Check the earth leakage breaker capacity and the sensitivity current. <2> Meg failure for electrical system other than the inverter <3> If <1> or <2> is not the cause of the problem, refer to the following page(s). [8- 10-11 Solutions for the Main No-Fuse Breaker Trip](page 294) [4] Only the compressor does not operate. Check the inverter frequency on the LED monitor. If the frequency indicates that the units are in operation, refer to the following page(s). [8-10-5 Checking the Inverter for Damage during Compressor Operation](page 291) [5] The compressor vibrates violently at all times or makes an abnormal sound. Refer to the following page(s). [8-10-5 Checking the Inverter for Damage during Compressor Operation](page 291) [6] Only the fan motor does not operate. Check the inverter frequency on the LED monitor. If the frequency indicates that the units are in operation, refer to the following page(s). [8-10-7 Checking the Fan Board Error Detection Circuit at No Load](page 291) [8-10-8 Checking the Fan Inverter for Damage at No Load](page 292) [8-10-9 Checking the Fan Inverter for Damage with Load](page 293) [7] The fan motor shakes violently at all times or makes an abnormal sound. Check the inverter frequency on the LED monitor. If the frequency indicates that the units are in operation, refer to the following page(s). [8-10-7 Checking the Fan Board Error Detection Circuit at No Load](page 291) [8-10-8 Checking the Fan Inverter for Damage at No Load](page 292) [8-10-9 Checking the Fan Inverter for Damage with Load](page 293) [8] Noise is picked up by the peripheral device <1> Check that power supply wiring of the peripheral device does not run close to the power supply wiring of the outdoor unit. <2> Check that the inverter output wiring is not in close contact with the power sup- ply wiring and the transmission lines. <3> Check that the shielded wire is used as the transmission line when it is required, and check that the grounding work is performed properly on the shielded wire. <4> Meg failure for electrical system other than the inverter <5> Attach a ferrite core to the inverter output wiring. (Contact the factory for details of the service part settings.) <6> Provide separate power supply to the air conditioner and other electric appli- ances. <7> If the problem suddenly appeared, inverter output may have had a ground fault. For details, refer to the following page(s). [8-10-5 Checking the Inverter for Damage during Compressor Operation](page 291) *Contact the factory for cases other than those listed above. [9] Sudden malfunction (as a result of external noise.) <1> Check that the grounding work is performed properly. <2>Check that the shielded wire is used as the transmission line when it is required, and check that the grounding work is performed properly on the shielded wire. <3>Check that neither the transmission line nor the external connection wiring does not run close to another power supply system or does not run through the same conduit pipe.

Contact the factory for cases other than those listed above.

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8-10-2 Checking the Inverter Board Error Detection Circuit 8-10-3 Checking the Compressor for Ground Fault and Coil Resistance Problems 8-10-4 Checking the Inverter for Damage at No-Load Items to be checked Phenomena Remedy (1) Remove power sup- ply. 1) IPM/overcurrent breaker trip Error code: 4250 Detail code: No. 101, 103, 104, 105, 106, and 107 Refer to the following page(s). [8-10-14 Troubleshooting Problems with Intelligent Power Module](page 296) Replace the IPM, and put the outdoor unit back into operation. If the problem persists, replace the INV board. (2) Disconnect the invert- er output wire from the output terminals (U, V, W) of the IPM. 2) Logic error Error code: 4220 Detail code: No. 111 Refer to the following page(s). [8-10-14 Troubleshooting Problems with Intelligent Power Module](page 296) Replace the IPM, and put the outdoor unit back into operation. If the problem persists, replace the INV board. Replace the INV board, and put the outdoor unit back into operation. If the problem persists, replace the DCCT. (3) Apply power supply. 3) ACCT sensor circuit failure Error code: 5301 Detail code: No.117 Replace the INV board. (4) Put the outdoor unit into operation. 4) DCCT sensor circuit failure Error code: 5301 Detail code: No.118 Replace the DCCT board. Replace the DCCT, and put the outdoor unit back into operation. If the problem persists, replace the INV board. 5) IPM open Error code: 5301 Detail code: No.119 Normal Items to be checked Phenomena Remedy Disconnect the compressor wiring, and check the compres- sor Meg, and coil resistance. 1) Compressor Meg failure Error if less than 1 Mohm. When no liquid refrigerant in the compres- sor Replace the compressor Check that no liquid refrigerant in the compressor. 2) Compressor coil resistance failure Coil resistance value of 0.092 Ω

(20°C [68°F])

Items to be checked Phenomena Remedy (1) Remove power supply. 1) Inverter-related problems are detected. Turn off SW1-1 and go to section 8-10-2. 2) Inverter voltage is not out- put. Check the connection between the IPM and the CNIPM on the INV board. Replace the IPM. If the problem persists, replace the INV board. (2) Disconnect the inverter output wire from the output terminals (U, V, W) of the IPM. 3) There is an voltage imbal- ance between the wires. Greater than 5% imbalance or 5V Replace the IPM. If the problem persists, replace the INV board. (3) Turn on SW1-1 on the INV board. (4) Apply power supply. 4) There is no voltage imbal- ance between the wires. Normal *Turn off SW1-1 (5) Put the outdoor unit into oper- ation.

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8-10-11 Solutions for the Main No-Fuse Breaker Trip 8-10-12 Solutions for the Main Earth Leakage Breaker Trip The insulation resistance could go down to close to 1MΩ after installation or when the power is kept off for an extended period of time because of the accumulation of refrigerant in the compressor. If the earth leakage breaker is triggered, please use the following procedure to take care of this. Disconnect the wires from the compressor's terminal block. If the resistance is less than 1 MΩ, switch on the power for the outdoor unit with the wires still disconnected. Leave the power on for at least 12 hours. Check that the resistance has recovered to 1 MΩ or greater. Earth leakage current measurement method For easy on-site measurement of the earth leakage current, enable the filter with a measurement instrument that has filter functions as below, clamp all the power supply wires, and measure. Recommended measurement instrument: CLAMP ON LEAK HiTESTER 3283 made by HIOKI E.E. CORPORATION When measuring one device alone, measure near the device's power supply terminal block. Items to be checked Phenomena Remedy [1] Perform Meg check between the terminals on the power terminal block TB1. Zero to several ohm, or Meg failure a. Check each part in the main inverter circuit. Refer to the following page(s). [8- 10-13 Simple Check on Inverter Circuit Components](page 295) Diode stack

Ipm

Rush current protection resistor Electromagnetic relay DC reactor b. A compressor ground fault can be considered. Go to 8-10-3. [2] Turn on the power again and check again. 1) Main power breaker trip 2) No remote control display [3] Turn on the outdoor unit and check that it operates normally. 1) Operates normally without tripping the main breaker. a. The wiring may have been short- circuited. Search for the wire that short-circuited, and repair it. b. If item a) above is not the cause of the problem, the compressor may have a problem. 2) Main power breaker trip A compressor ground fault can be con- sidered. Go to 8-10-3. Items to be checked Phenomena Remedy [1] Check the earth leakage breaker capacity and the sensitivity cur- rent. Use of a non-specified earth leakage breaker Replace with a regulation earth leakage breaker. [2] Check the resistance at the power supply terminal block (TB1) with a megger. Failure resistance value Check each part and wiring. Refer to the following page(s). [8-10-13 Simple Check on Inverter Circuit Compo- nents](page 295)

Ipm

Rush current protection resistor Electromagnetic relay DC reactor [3] Disconnect the compressor wir- ings and check the resistance of the compressor with a megger. Failure compressor if the insu- lating resistance value is not in specified range. Failure when the insulating re- sistance value is 1 MΩ or less. Check that there is no liquid refrigerant in the compressor. If there is none, replace the compressor. [4] Disconnect the fan motor wirings and check the resistance of the fan motor with a megger. Failure fan motor if the insulat- ing resistance value is not in specified range. Failure when the insulating re- sistance value is 1 MΩ or less. Replace the fan motor.

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[8-11 Troubleshooting Inverter Problems (YKMU) ]

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8-11 Troubleshooting Inverter Problems (YKMU) 8-11-1 Inverter-Related Problems and Solutions Replace only the compressor if only the compressor is found to be defective. (Overcurrent will flow through the inverter if the compressor is damaged, however, the power supply is automatically cut when overcurrent is detected, protecting the inverter from damage.) Replace only the fan motor if only the fan motor is found to be defective. (Overcurrent will flow through the inverter if the fan motor is damaged, however, the power supply is automatically cut when overcurrrent is detected, protecting the inverter from damage.) Replace the defective components if the inverter is found to be defective. If both the compressor and the inverter are found to be defective, replace the defective component(s) of both devices. (1) Inverter-related problems: Troubleshooting and remedies 1) The INV board has a large-capacity electrolytic capacitor, in which residual voltage remains even after the main power is turned off, posing a risk of electric shock. Turn off the unit, leave it turned off for at least 10 minutes, and check that the voltage across FT-P and FT-N terminals on the INV board or the terminals at both ends of the electrolytic capacitor is 20V or below before checking inside the control box. (It takes about 10 minutes to discharge electricity after the power supply is turn off.) 2) Disconnect the outdoor unit fan board connector (CNINV) before performing maintenance work. (To plug or unplugconnec- tors, check that the outdoor unit fan is not rotating and that the voltage of capacitor in the main circuit is 20 VDC or below. The capacitor may collect a charge and cause an electric shock when the outdoor unit fan rotates in windy conditions. Refer to the wiring nameplate for details.) 3) To connect wiring to TB7, check that the voltage is 20 VDC or below. 4) Reconnect the connector (CNINV) to the fan board after completion of maintenance work. 5) The IPM on the inverter becomes damaged if there are loose screws are connectors. If a problem occurs after replacing some of the parts, mixed up wiring is often the cause of the problem. Check for proper connection of the wiring, screws, connectors, and Faston terminals. 6) To avoid damage to the circuit board, do not connect or disconnect the inverter-related connectors with the main power turned on. 7) Faston terminals have a locking function. Make sure the terminals are securely locked in place after insertion. 8) When the IPM or IGBT is replaced, apply a thin layer of heat radiation grease that is supplied evenly to these parts. Wipe off any grease that may get on the wiring terminal to avoid terminal contact failure. 9) Faulty wiring to the compressor damages the compressor. Connect the wiring in the correct phase sequence. 10) When the power is turned on, the compressor is energized even while it is not operating. Before turning on the power, dis- connect all power supply wires from the compressor terminal block, and measure the insulation resistance of the compressor. Check the compressor for a graound fault. If the insulation resistance is 1.0 MΩ or below, connect all power supply wires to the compressor and turn on the power to the outdoor unit. (The liquid refrigerant in the compressor will evaporate by energiz- ing the compressor.) Press the tab on the terminals to remove them.

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8 Troubleshooting Based on Observed Symptoms Error display/failure condition Measure/inspection item [1] Inverter related errors 4250, 4255, 4220, 4225, 4230, 4240, 4260, 5301, 5305, 0403 Implement solutions that correspond to the error codes or preliminary error codes.[7-1 Error Code and Preliminary Error Code Lists](page 175) [2] Main power breaker trip Refer to the following page(s). [8-11-11 Solutions for the Main No-Fuse Breaker Trip](page 304) [3] Main power earth leakage breaker trip Refer to the following page(s). [8-11-12 Solutions for the Main Earth Leakage Breaker Trip](page 304) [4] Only the compressor does not operate. Check the inverter frequency on the LED monitor. If the frequency indicates that the units are in operation, refer to the following page(s). [8-11-5 Checking the Inverter for Damage during Compressor Operation](page 301) [5] The compressor vibrates violently at all times or makes an abnormal sound. Refer to the following page(s). [8-11-5 Checking the Inverter for Damage during Compressor Operation](page 301) [6] Only the fan motor does not operate. Check the inverter frequency on the LED monitor. If the frequency indicates that the units are in operation, refer to the following page(s). [8-11-7 Checking the Fan Board Error Detection Circuit at No Load](page 301) [8-11-8 Checking the Fan Inverter for Damage at No Load](page 302) [8-11-9 Checking the Fan Inverter for Damage with Load](page 303) [7] The fan motor shakes violently at all times or makes an ab- normal sound. Check the inverter frequency on the LED monitor. If the frequency indicates that the units are in operation, refer to the following page(s). [8-11-7 Checking the Fan Board Error Detection Circuit at No Load](page 301) [8-11-8 Checking the Fan Inverter for Damage at No Load](page 302) [8-11-9 Checking the Fan Inverter for Damage with Load](page 303) [8] Noise is picked up by the peripheral device <1> Check that power supply wiring of the peripheral device does not run close to the power supply wiring of the outdoor unit. <2> Check if the inverter output wiring is not running parallel to the power supply wiring and the transmission lines. <3> Check that the shielded wire is used as the transmission line when it is re- quired, and check that the grounding work is performed properly on the shielded wire. <4> Meg failure for electrical system other than the inverter <5> Attach a ferrite core to the inverter output wiring. (Contact the factory for de- tails of the service part settings.) <6> Provide separate power supply to the air conditioner and other electric ap- pliances. <7> If the problem suddenly appeared, inverter output may have had a ground fault. For details, refer to the following page(s). [8-11-5 Checking the Invert- er for Damage during Compressor Operation](page 301) *Contact the factory for cases other than those listed above. [9] Sudden malfunction (as a result of external noise.) <1> Check that the grounding work is performed properly. <2>Check that the shielded wire is used as the transmission line when it is re- quired, and check that the grounding work is performed properly on the shielded wire. <3>Check that neither the transmission line nor the external connection wiring does not run close to another power supply system or does not run through the same conduit pipe.

Contact the factory for cases other than those listed above.

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8-11-11 Solutions for the Main No-Fuse Breaker Trip 8-11-12 Solutions for the Main Earth Leakage Breaker Trip The insulation resistance could go down to close to 1 MΩ after installation or when the power is kept off for an extended period of time because of the accumulation of refrigerant in the compressor. If the earth leakage breaker is triggered, please use the following procedure to take care of this. Disconnect the wires from the compressor's terminal block. If the resistance is less than 1 MΩ, switch on the power for the outdoor unit with the wires still disconnected. Leave the power on for at least 12 hours. Check that the resistance has recovered to 1 MΩ or greater. Earth leakage current measurement method For easy on-site measurement of the earth leakage current, enable the filter with a measurement instrument that has filter functions as below, clamp all the power supply wires, and measure. Recommended measurement instrument: CLAMP ON LEAK HiTESTER 3283 made by HIOKI E.E. CORPORATION When measuring one device alone, measure near the device's power supply terminal block. Items to be checked Phenomena Remedy [1] Check the breaker capacity. Use of a non-specified break- er Replace it with a specified breaker. [2] Perform Meg check between the terminals on the power terminal block TB1. Zero to several ohm, or Meg failure Check each part and wiring. Refer to the following page(s).[8-11-13 Simple Check on Inverter Circuit Compo- nents](page 305) IGBT module Rush current protection resistor Electromagnetic relay DC reactor [3] Turn on the power again and check again. 1) Main power breaker trip 2) No remote control display [4] Turn on the outdoor unit and check that it operates normally. 1) Operates normally without tripping the main breaker. a) The wiring may have been short-circuit- ed. Search for the wire that short-circuit- ed, and repair it. b) If item a) above is not the cause of the problem, refer to 8-11-2 - 8-11-10 2) Main power breaker trip Items to be checked Phenomena Remedy [1] Check the earth leakage breaker capacity and the sensitivity cur- rent. Use of a non-specified earth leakage breaker Replace with a regulation earth leakage breaker. [2] Check the resistance at the power supply terminal block with a meg- ger. Failure resistance value Check each part and wiring. Refer to the following page(s).[8-11-13 Simple Check on Inverter Circuit Compo- nents](page 305) IGBT module Rush current protection resistor Electromagnetic relay DC reactor [3] Disconnect the compressor wir- ings and check the resistance of the compressor with a megger. Failure compressor if the insu- lating resistance value is not in specified range. Failure when the insulating re- sistance value is 1 MΩ or less. Check that there is no liquid refrigerant in the compressor. If there is none, replace the compressor. [4] Disconnect the fan motor wirings and check the resistance of the fan motor with a megger. Failure fan motor if the insulat- ing resistance value is not in specified range. Failure when the insulating re- sistance value is 1 MΩ or less. Replace the fan motor.

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[8-13 Control Circuit (YKMU) ]

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8-13-2 Troubleshooting Problems with Outdoor Unit Transmission Power Supply Circuit

1) Pury-Hp72, Hp96Ykmu-A

Yes

No

Dc270 ~ 356V

Ac414 ~ 506V

Fuse F4 on the noise filter board is blown.

Ac414 ~ 506V

Yes

No

Yes

No

Yes

No

Yes

No

Yes

No

Yes

Check the voltage between L2 and L3 at the power supply terminal block TB1. Check the voltages among TB22 and TB23 on the noise filter Fuse F5 is blown. Fuse F5 is blown. Fuse F5 is blown. Check fuse F5. Pull out CN4 and CN5 on the noise filter, replace fuse F5, and turn on the power.

Yes

Check the voltage at the indoor/outdoor transmission terminal block (TB3) of outdoor unit.

Dc 24 ~ 30 V

Check the voltage at TB3 after removing transmission line from TB3.

Dc 24 ~ 30 V

Check whether the male connector is connected to the female power supply connector (CN40). Connected Check voltage of terminal block for centralized control (TB7). Check voltage of TB7 by removing transmission line from TB7. Check the voltage between No.1 and No.2 pins of the CNS2 on the control board. Check the voltage between No.1 and No.3 pins of the noise filter CN4.

Dc270 ~ 356V

Check the voltage between No.1 and No.3 pins of the noise filter CN5. Check the noise filter fuse F4 . Turn on the power again. Check and fix any power supply wiring and main power supply problems found. Replace the noise filter. Replace the noise filter. Replace the M-NET board Connect the noise filter CN4, and then turn the power on. Replace the control board. Replace the noise filter. Replace the noise filter. Replace the control board. Fuse F4 on the noise filter board is blown. Fuse F4 on the noise filter board is blown. Disconnect the noise filters CN4 and CN5, and then replace fuse F4 on the noise filter board, then turn the power on. Connect the noise filter CN4, and then turn the power on. Replace the M-NET board Replace the M-NET board Replace the control board. Is the voltage measurement between 4.5 and 5.2 VDC? Replace the M-NET board Check the voltage between No.5 and No.2 pins of the CNPS on the control board. Is there a connector disconnection? Fix the connector disconnection. Check whether the transmission line is disconnected, check for contact failure, and repair the problem. Check if the indoor/outdoor transmission line is not short-circuited, and repair the problem. Check the wiring between the control board and power supply board for the transmission line (CN62, CNPS, CN102 and CNIT), and check for proper connection of connectors. Check the wiring between the control board and power supply board for the transmission line (CN62, CNPS, CN102 and CNIT), and check for proper connection of connectors. Fix the wiring and connector disconnection. Check for shorted transmission line or power feed collision for centralized control. Replace the control board. Is there a wiring error or a connector disconnection? Check the voltage between No.1 and No.2 pins of the CN102 on the power supply board for the transmission line.

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[8-14 Measures for Refrigerant Leakage ]

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8 Troubleshooting Based on Observed Symptoms 8-14 Measures for Refrigerant Leakage

Leak spot: In the case of extension pipe for indoor unit (Cooling season)

1) Mount a pressure gauge on the service check joint (CJ2) on the low-pressure side. 2) Stop all the indoor units, and close the high-pressure side refrigerant service valve (BV2) on the outdoor unit while the com- pressor is being stopped. 3) Stop all the indoor units; turn on SW4 (912) on the outdoor unit control board while the compressor is being stopped. (Pump down mode will start, and all the indoor units will run in cooling test run mode.) 4) In the pump down mode (SW4 (912)), all the indoor units and compressors will automatically stop when the low pressure (63LS) reaches 0.383MPa [55psi] or less or 15 minutes have passed after the pump mode started. Stop all the indoor units and compressors when the pressure indicated by the pressure gauge, which is on the check joint (CJ2) for low-pressure ser- vice, reaches 0.383MPa [55psi] or 20 minutes pass after the pump down operation is started. 5) Close the service ball valve (BV1) on the low-pressure pipe on the outdoor unit. 6) Collect the refrigerant that remains in the extended pipe for the indoor unit. Do not discharge refrigerant into the atmosphere when it is collected. 7) Repair the leak. 8) After repairing the leak, vacuum*1 the extension pipe and the indoor unit. 9) To adjust refrigerant amount, open the ball valves (BV1 and BV2) inside the outdoor unit, and turn off SW4 (912).

Leak spot: In the case of outdoor unit (Cooling season)

(1) Run all the indoor units in the cooling test run mode. 1) To run the indoor unit in test run mode, turn SW4 (769) on the outdoor unit control board to ON. 2) Change the setting of the remote controller for all the indoor units to the cooling mode. 3) Check that all the indoor units are performing a cooling operation. (2) Check the SC16 value. (This value can be displayed on the LED by setting the self-diagnosis switch SW4 (SW6-10: OFF) on the outdoor unit control board.) 1) When SC16 is 10°C [18°F] or above: Go to the next item (3). 2) When the SC16 value is below 10°C [18°F] : After the compressor has stopped, extract the refrigerant in the system, repair the leak, evacuate the air from the system *1, and charge the system with refrigerant. (If the leak is in the outdoor unit, follow the same procedure as listed under "heating season.") (3) Stop all the indoor units, and stop the compressor. 1) To stop all the indoor units and the compressors, turn SW4 (769) on the outdoor control board from ON to OFF. 2) Check that all the indoor units are being stopped. (4) Close the ball valves (BV1 and BV2). (5) Collect the refrigerant that remains inside the outdoor unit.Do not discharge refrigerant into air into the atmosphere when it is collected. (6) Repair the leak. (7) After repairing the leak, replace the dryer with the new one, and perform evacuation*1 inside the outdoor unit. (8) To adjust refrigerant amount, open the ball valves (BV1 and BV2) inside the outdoor unit. *1. For details, refer to the following page(s). [1-3-3 Vacuum Drying](page 12) SC16 self-diagnosis switch For how to read the SW settings, refer to the following page(s). [9-1-1 How to Read the LED](page 325) 1 2 3 4 5 6 7 8 10 9

On

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[8-16 Solenoid Valve Block and Check Valve Replacement Instructions ]

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8 Troubleshooting Based on Observed Symptoms 8-16 Solenoid Valve Block and Check Valve Replacement Instructions 1.Applicable models

䊶Pury-Hp72,96Tkmu-A-H(-Bs)

䊶Pury-Hp72,96Ykmu-A(-Bs)

2.Parts to be serviced, Set-content Following instructions are applicable to 1-4 service parts on the table below. Numbers 1 1 1 1 1 1 1 1 1 1 1 1 3.Procedures *Precautions for starting replacement 䊶Check that the main power supply is OFF. 䊶Check that no refrigerant is in the outdoor unit. Remove each part according to the 1)-3) procedures on the figure above right before replacing service parts. Mount the removed parts back in place in a reversed procedure of 1)-3) on the figure above right after replacing service parts. (1) Solenoid valve block ASSY (SV4a, SV4b, SV4d) replacement procedures 䃂To remove Solenoid valve block ASSY 㽲Remove the solenoid valve block coil cover, solenoid valve coil, and peripheral cables. 㽳Remove the screw (M5) that fixes the supporting plate for solenoid valve block and the unit base. 㽴Debraze A-G parts (total 7 places). 㽵Do not damage heat exchanger fins and peripheral piping devices when removing the Solenoid valve block ASSY. 㽶Remove the screw (M5) that fixes the solenoid valve block and the supporting plate for solenoid valve block. 䃂To install Solenoid valve block ASSY 㽷Fix the Solenoid valve block ASSY and the supporting plate with the fixing screw (M5). 㽸Mount the Solenoid valve block ASSY replacement to the unit with care not to damage heat exchanger fins and peripheral piping devices. Fix the supporting plate for solenoid valve block and the unit base with the fixing screw (M5). 㽹Braze A-G parts (total 7 places). 㽺Mount the solenoid valve block coil cover, solenoid valve coil, and peripheral cables back in place. Things required for replacing

No.

e d o

C

m e tI Parts to be serviced Solenoid valve block service parts set 䇭䇭䇭䇼Set-content䇽 1 Solenoid valve block ASSY (SV4a, SV4b, SV4d)

Kb00S879G20

Wt07188X01

Kb00V126G01

䇭䇭䇭䊶Replacement instructions 䇭䇭䊶Solenoid valve block ASSY

P633133X01

Kb00S879G15

Service parts replacement instructions Service parts replacement instructions 䇭䇭䇭䊶Check valve 䇭䇭䇭䇼Set-content䇽

Kb00S879G14

P639183X01

Wt06632X01

Check valve (CV4a, CV8a) 䇭䇭䇭䊶Replacement instructions 3 Check valve (CV6a) 2 䇭䇭䊶Check valve 䇭䇭䇭䇼Set-content䇽䇭䇭䇭䊶Replacement instructions 4 Check valve (CV9a) Service parts replacement instructions

Kb00S879G16

䇭䇭䇭䇼Set-content䇽䇭䇭䇭䊶Replacement instructions

Wt06632X01

䇭䇭䇭䊶Check valve

P639180X01

䇭* Precautions for replacing Solenoid valve block ASSY 䇭䊶Be sure to perform no-oxidation brazing when brazing. 䇭䊶Place a wet towel on the solenoid valve block when heating pipes to keep the temperature of the valve from exceeding 120ºC. 䇭䊶After brazing, check the condition around the brazing. After confirming no leakage, evacuate the air inside. 䇭䊶Perform brazing with care of the flame direction so that it does not burn cables and plates etc. in the unit. 䇭䊶Remove the brazing part protecting heat exchanger fins from burning, and replace the service parts.

Following instructions show procedures for replacing service parts for Solenoid valve block ASSY (SV4a, SV4b,

SV4d), Check valve (CV4a, CV6a, CV8a, CV9a). Replace them properly according to the procedures. R410A CITY MULTI H2i R2 Solenoid valve block ASSY (SV4a, SV4b, SV4d), Check valve (CV4a, CV6a, CV8a, CV9a) replacement instructions

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[9-2 LED Status Indicators Table]

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9 LED Status Indicators on the Outdoor Unit Circuit Board 11 1101000000 External signal (Open input contact point) Contact point de- mand Low-noise mode (Capacity priority ) Snow sensor

A

12 0011000000 External signal (Open input contact point) Low-noise mode (Quiet priori- ty)

A

13 1011000000 14 0111000000 Outdoor unit operation status BC opera- tion signal Warm-up mode 3-minutes restart mode Compressor in operation Preliminary error Error 3-minutes restart after instanta- neous power failure Preliminary low pres- sure error

A

15 1111000000 OC/OS identification

Oc/Os

A

16 0000100000 Indoor unit check Top Unit No. 1 Unit No. 2 Unit No. 3 Unit No. 4 Unit No. 5 Unit No. 6 Unit No. 7 Unit No. 8

B

The lamp that corre- sponds to the unit that came to an abnormal stop lights. The lamp goes off when the error is reset. Each unit that comes to an abnormal unit will be given a sequential num- ber in ascending order starting with 1. Bottom Unit No. 9 Unit No. 10 Unit No. 11 Unit No. 12 Unit No. 13 Unit No. 14 Unit No. 15 Unit No. 16 17 1000100000 Top Unit No. 17 Unit No. 18 Unit No. 19 Unit No. 20 Unit No. 21 Unit No. 22 Unit No. 23 Unit No. 24 Bottom Unit No. 25 Unit No. 26 Unit No. 27 Unit No. 28 Unit No. 29 Unit No. 30 Unit No. 31 Unit No. 32 18 0100100000 Top Unit No. 33 Unit No. 34 Unit No. 35 Unit No. 36 Unit No. 37 Unit No. 38 Unit No. 39 Unit No. 40 Bottom Unit No. 41 Unit No. 42 Unit No.43 Unit No. 44 Unit No. 45 Unit No. 46 Unit No. 47 Unit No. 48 19 1100100000 Top Unit No. 49 Unit No. 50 Bottom 20 0010100000 Indoor unit Operation mode Top Unit No. 1 Unit No. 2 Unit No. 3 Unit No. 4 Unit No. 5 Unit No. 6 Unit No. 7 Unit No. 8

B

Lit during cooling Blinking during heating Unlit while the unit is stopped or in the fan mode Bottom Unit No. 9 Unit No. 10 Unit No. 11 Unit No. 12 Unit No. 13 Unit No. 14 Unit No. 15 Unit No. 16 21 1010100000 Top Unit No. 17 Unit No. 18 Unit No. 19 Unit No. 20 Unit No. 21 Unit No. 22 Unit No. 23 Unit No. 24 Bottom Unit No. 25 Unit No. 26 Unit No. 27 Unit No. 28 Unit No. 29 Unit No. 30 Unit No. 31 Unit No. 32 22 0110100000 Top Unit No. 33 Unit No. 34 Unit No. 35 Unit No. 36 Unit No. 37 Unit No. 38 Unit No. 39 Unit No. 40 Bottom Unit No. 41 Unit No. 42 Unit No.43 Unit No. 44 Unit No. 45 Unit No. 46 Unit No. 47 Unit No. 48 23 1110100000 Top Unit No. 49 Unit No. 50 Bottom Current data No. SW4 (When SW6 - 10 is set to OFF) Item Display Unit