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15
ELECTRONIC CONTROL
OPERATION
Heat Pump w/back up Electric Heat
If the indoor ambient air themister reads 55 degrees,
turn off the compressor and turn on the electric heat and
continue fan operation until temp setting is satised. Then
revert to standard heat pump operation.
If the compressor is time delayed:
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 for 2
minutes continuously, 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
180-240 seconds:
1. Turn off the backup electric heat
2. Wait 5 seconds
3. Turn on the compressor
4. Continue fan operation.
ELECTRIC SHOCK HAZARD
WARNING
Disconnect power to the unit before
servicing. Failure to follow this warning
could result in serious injury or death.
COMPONENTS TESTING
THERMOSTAT
(“WE” & “WY” Models)
A cross ambient thermostat is used on all electric heat and
heat pump WallMaster models (see Figure 9).
Range from 60° F (±2° F) to 92° F (±2° F).
TEST:
Remove wires from thermostat and check continuity
between terminal “2” (common) and “1” for heating. Also
check that contacts in thermostat open after placing in
either position. NOTE: Temperature must be within range
listed to check thermostat.
Figure 9 : Thermostat
THERMOSTAT ADJUSTMENT
No attempt should be made to adjust thermostat. Due to
the sensitivity of the internal mechanism and the sophis-
ticated equipment required to check the calibration, it is
suggested that the thermostat be replaced rather than
calibrated.
FAN MOTOR - TEST
1. Determine that capacitor is serviceable.
2. Disconnect fan motor wires from fan speed switch or
system switch.
3. Apply “live” test cord probes on black wire and common
terminal of capacitor. Motor should run at high speed.
4. Apply “live” test cord probes on red wire and common
terminal of capacitor. Motor should run at low speed.
5. Apply “live” test cord probes on each of the remaining
wires from the speed switch or system switch to test
intermediate speeds. If the control is in the “MoneySaver”
mode and the thermostat calls for cooling, the fan will
start - then stop after approximately 2 minutes; then the
fan and compressor will start together approximately 2
minutes later.
Fan Motor
FAN MOTOR
A single phase permanent split capacitor motor is used to drive
the evaporator blower and condenser fan. A self-resetting
overload is located inside the motor to protect against high
temperature and high amperage conditions. (See Figure 23)
ELECTRIC SHOCK HAZARD
WARNING
Disconnect power to the unit before
servicing. Failure to follow this warning
could result in serious injury or death.