What are the correct wire colors for the ABCD connection on the Infinity Thermostat?

The recommended color code for ABCD connections is: A (Green) = Data A, B (Yellow) = Data B, C (White) = 24VAC Common, and D (Red) = 24VAC Hot. While it is not mandatory to use these colors, each ABCD connector in the system MUST be wired consistently throughout. If thermostat wiring is located near high voltage, cable TV, or Ethernet wiring, shielded thermostat wire can be used with the shield connected to ground at the indoor unit only, not at the user interface.