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Component Testing
Compressor Description
Test Procedure
Motor, DC
Refrigerator fan circulates
See Refrigeration and Defrost Component Checks Made at High
cold air into refrigerator
Voltage Board. For DC fan voltage check procedures at High
Voltage Board.
Condensate evaporation fan
Check for voltage across terminals.
and out through toe grille
to assure complete conden-
sate
evaporation.
DC fan motors are connected
in series with semiconductor
switch.
Overload /
Overload is a temperature
1.
Disconnect power to the refrigerator.
Relay
and current sensing device.
2.
Remove relay cover and pull relay off compressor. Pull over
–
load protector off compressor common terminal.
Overload opened when high
3.
With ohmmeter, check the resistance between male terminal
current or high compressor
and female pin receptacle terminal which pushes onto
temperature is sensed.
Compressor common terminal. At ambient room temperature
Overload protector should have less than 1 ohm resistance.
After overload opens, reset
An open overload protector will have infinite resistance.
can require up to two hours
depending on ambient
temperature and residual
heat load in compressor.
Relay (See PTC Relay).
Relay, PTC
When voltage is connected
With power off check resistance across terminals 2 and 3. Refer
and relay is cool, current
to Technical Data Sheet for values for model being serviced.
passed through relay to
start winding. After a short
time, current heats the
resistor in relay and
resistance will rise blocking
current flow through relay.
start winding remains in the
circuit through run capacitor.
Solid state relay plugs
directly on compressor
start and run terminals.
Relay terminals 2 and 3 are
connected within relay. Run
capacitor is connected to
relay terminals 3. L2 side
of the 120 VAC power is
connected to relay terminal 2.
