ELECTRONIC CONTROL OPERATION
Heat Pump Models
If the indoor ambient air themister reads 55 degrees or lower, the control will turn off the compressor and turn on the electric heat and continue fan operation until temp setting is satisfied. Then revert to standard heat pump operation.
If the compressor is time delayed, the control will:
1.Turn on the electric heat until the compressor is not time delayed.
2.When the compressor’s 3 minute time delay is over, turn off the electric heat, wait 5 seconds, then turn on the compressor.
Defrost:
If the outdoor coil thermister reads 30 degrees or lower for 2 minutes continuously, the control will turn off the compressor and turn on the electric heat and continue fan operation.
If the outdoor coil thermister reaches 43 degrees and the compressor has waited the standard delay time of
1.Turn off the backup electric heat
2.Wait 5 seconds
3.Turn on the compressor
4.Continue fan operation.
COIL SENSORS
Positioning of the Coil Sensors (Thermisters) is critical to proper operation of the Electronic Control.
Ensure that sensors are positioned as indicated in the illustrations below.
COMPONENTS TESTING
WARNING
ELECTRIC SHOCK HAZARD
Disconnect power to the unit before servicing. Failure to follow this warning could result in serious injury or death.
FAN MOTOR
A single phase permanent split capacitor motor is used to drive the evaporator blower and condenser fan. A
WARNING
ELECTRIC SHOCK HAZARD
Disconnect power to the unit before servicing. Failure to follow this warning could result in serious injury or death.
FAN MOTOR - TEST
1.Make sure the motor has cooled down.
2.Disconnect the fan motor wires from the control board.
3.Test for continuity between the windings also, test to ground.
4.If any winding is open or grounded replace the motor.
Fan Motor
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