SERVICE MANUAL for MODEL AirV Rooftop Air Conditioning Systems

3.12.2 Timeguard TimerA 3--minute timeguard is built into the thermostatimmediately upon power up, and any time thecompressor (output “Y”) turns off. The compressor willnot turn on until the timeguard has expired. Pressing UPand FAN buttons simultaneously will override thetimeguard for 1 cycle.3.12.3 Cycle TimerIn normal cooling (and heating) operation thethermostat will not allow more than 4 equipment cyclesper hour (or 1 cycle every 15 minutes). Both the “Y”(cooling) and “W” (heating) outputs have a 15--minutetimer that starts counting down when the output isturned on, (e.g., if “Y” output is turned on for 9 minutesand then satisfies, it cannot turn back on for another 6minutes regardless of demand). However, pressing UPand FAN buttons simultaneously or changing the setpoint will override the timer for 1 cycle.3.12.4 Minimum On TimerOnce the equipment has turned on, it will remain on for aminimum of 2 minutes regardless of demand. However,the equipment can turn off in less than 2 minutes if achange in set point, or a change in mode occurs.3.12.5 Error MessagesE4 will be displayed if the thermostat has an internalmemory failure. If E4 appears, replace the thermostat.---- (two dashes) will be displayed if the thermostatcannot properly read the room temperature. If ----appears, replace the thermostat.UPPER UNITFactory WiringField WiringMotorComp.1 2 3 4 2 11234J115V AC High VoltagePower Supply(Dedicated 20 Amp Service)LN2N1POWER BOXASSEMBLY12345WYGHGLCYGGLRCTHERMOSTATCOOL (Compressor)FAN (High)FAN (Low)12VDC LowVoltagePower Supply(+)(--)CEILING UNITFigure 3 -41 Wall Thermostat Wiring Diagram - Cool Only Model10/093--19T--298