27
Component Testing
Compressor Description
Test Procedure
Refrigerant gas is pulled through
1.
Separate evaporate from rest of refrigeration system and
suction line by compressor to
pressurize evaporator up to a maximum of 235 PSI with
complete the refrigerant cycle.
a refrigerant and dry nitrogen combination.
2.
Recheck
for
leaks.
Heater,
Applied to back of ice and water
Check resistance across heater.
cavity
cavity to help prevent conden-
sation from forming on face of
If heater is faulty, use spare heater foamed in place at factory.
cavity. Wire in series with hot
side of line through auger motor
interlock
switch.
Heater,
See “Electronic Function
Check resistance across heater.
evaporator
Description, Adaptive Defrost
(defrost) Circuitry.
To
check
defrost
system:
1.
Thermocouple defrost thermostat and plug refrigerator into
wattmeter.
2.
Force into defrost mode (see section on electronic testing)
Wattmeter should read specified watts (according to Technical
Data Sheet) ±5 F; thermostat should interrupt power to heater
Heater mullion For service use only to reduce
condensation on center mullion.
Heater formed in place. Not
To connect mullion heater to power:
powered from the factory.
1.
Disconnect power to unit using power switch.
2.
Remove ice grille.
3.
Remove bracket holding condenser evaporation fan and water valve.
4.
Locate water valve wiring harness.
5.
Carefully slit wiring harness vinyl sleeve to expose one black and
one white lead with bullet terminals inside harness sleeve.
6.
Connect to heater leads at left side of cabinet.
7.
Wrap vinyl sleeve with electrical tape to close slit.
Icemaker
See “icemaker” section for
service
information.
Motor
Condenser fan moves cooling
Check resistance across motor windings
Condenser
air across condenser coil and
compressor
body.
Motor
Evaporator motor moves air
1.
Disconnect power to unit.
Evaporator
across evaporator coil.
2.
Disconnect fan motor leads.
3.
Check resistance from ground connection solder. Trace to motor
frame must not exceed .05 ohms.
4.
Check for voltage at connection to motor.
