Randell 9215-32-7 Operator's Manual page 21

Trouble Shooting Guide (cont.)
SERVICING THE COMPRESSOR: The
compressor is part of the sealed refrigeration
system and should be replaced by a
professional service technician. You can,
however, test the compressor and certain
components. Prior to testing, unplug the unit
and remove the access cover to the
mechanical housing. A small box mounted on
the side of the compressor protects the relay,
overload protector, and capacitor. Release the
wire retaining clip that holds the cover in place
and slip off the cover and the clip.
To test the compressor relay, pull the relay
straight off the compressor without twisting or
damaging it. If the relay has an external wire
coil, hold the relay so that the word TOP is up.
Using a multimeter set at RX1, place the
probes on terminals S and M. The multimeter needle should not move. Remove
the probe from terminal M and place it on the side terminal marked L. The
multimeter needle should not move. Remove the probe from terminal S and place
it on terminal M. The multimeter needle should sweep across the scale, indicating
full continuity.
Turn the relay upside down. Using a multimeter set at RX1, place the probes on
terminals S and M. The multimeter needle should sweep across the scale,
indicating full continuity. Remove the probe from terminal M and place it on the
side terminal marked L. The multimeter needle should sweep across the scale,
indicating fully continuity. Remove the probe from terminal S and place it on
terminal M. The multimeter needle should not move.
If the relay fails any of the tests listed above, the relay is faulty and needs to be
replaced. Push a new relay onto the compressor terminals and replace the
terminal cover. If the relay passes all the tests listed above, proceed to testing of
the overload protector.
To remove the overload protector, use a screwdriver to gently pry open the circular
spring clip that secures the overload protector to the compressor and snap out the
overload protector. Pull the two wire connectors off the terminals. Using a
multimeter set at RX1, touch a probe to each overload protector terminal. The
multimeter needle should sweep across the scale, indicating full continuity. If the
overload protector passes this test, proceed to testing of the compressor. If the
overload protector fails this test, the overload protector is faulty and needs to be
replaced. Reattach the push-on connectors to the new overload protector, clip it in
place on the compressor, and replace the terminal cover.
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