How do I operate the system in 'TIMER' mode?

To set timer operation, press the 'ON' button once to activate and show “00” on LED display; press ‘TIMER’ button to select hours between 01-12. Press 'LOCK' until it beeps for setting lock-in place. Unlocked keypad allows readjustment of time if necessary before locking back into position. (Pages 15, 16 and reference drawing 36)