FUNCTIONAL COMPONENTS
A. Mechanical components
Drain pan valve
Temperature-sensitive valve that opens up to drain off condensate water when the outside temperature falls below 40°F
and closes when the outside temperature reaches 60°F
Plenum assemblyy
Diffuser with directional louvers used to direct the conditioned airflow.
Blower wheel
Attaches to the indoor side of the fan motor shaft and is used for distributing unconditioned, room side air though the heat
exchanger and delivering conditioned air into the room.
Slinger fan blade
g
Attaches to the outdoor side of the fan motor shaft and is used to move outside air through the condenser coil, while
slinging condensate water out of the base pan and onto the condenser coil, thus lowering the temperature and pressures
within the coil.
B. Electrical components
Thermostat
Used to maintain the specifi ed room side comfort level
System switch
y
Used to regulate the operation of the fan motor, the compressor or to turn the unit off. For troubleshooting, refer to the
wiring diagrams and schematics in the back of this service manual.
Capacitor
p
Reduces line current and steadies the voltage supply, while greatly improving the torque characteristics of the fan motor
and compressor motor.
MoneySaver
y
®
switch
®
When engaged, it sends the power supply to the fan motor through the thermostat, which allows for a cycle-fan operation.
Fan Motor
Dual-shafted fan motor operates the indoor blower wheel and the condenser fan blade simultaneously.
Solenoid
Used to energize the reversing valve on all heat pump units.
Heating element
g
Electric resistance heater
Heat anticipator
p
Used to provide better thermostat and room air temperature control.
C. Hermetic components
Compressor
p
Motorized device used to compress refrigerant through the sealed system.
Reversing valve
g
A four-way switching device used on all heat pump models to change the fl ow of refrigerant to permit heating or cooling.
Check valve
A pressure-operated device used to direct the fl ow of refrigerant to the proper capillary tube, during either the heating or
cooling cycle.
Capillary tube
p
y
A cylindrical meter device used to evenly distribute the fl ow of refrigerant to the heat exchangers (coils.)
8
Summary of Contents for WallMaster 2008
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