Randell BC-3 Operator's Manual - page 15
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Next set the meter at RX1000 and touch one probe to the motor
terminals and the other one to any unpainted metal part of the unit.
If the meter needle moves, the motor is grounded and should be
replaced. To remove the motor unscrew the bracket that holds the
fan motor to its housing, slide the motor out of the housing. Remove
the fan blade from the old motor and attach it to the new motor,
replacing any washers. Install the new motor in its housing by
screwing the bracket in place. Reattach the wires to the motor
terminals and reconnect the ground wire.
5. 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. 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. If the relay has an external wire coil, hold the relay so
that the word top is up. Set the multimeter at RX1 and place the
probes on the terminals S and M. The multimeter needle should not
move. Next remove the probe from M and place it on the side terminal
marked L. once again, the needle should not move. Finally, remove
the probe from S and place it on M. the needle should sweep across
the scale, showing full continuity. Now turn the relay upside down and
perform the same tests. You should get the opposite results: continuity
between terminals S and M and between S and L; no continuity
between M and L. if the relay fails any of these tests, replace it: push
the new relay onto the compressor terminals and replace the terminal
cover. If the relay passes these tests, test 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 protector. Pull the two wire connectors off their termi-
nals. To test set a multimeter at RX1 and touch a probe to each overload protector terminal. The multimeter
needle should sweep across the scale, showing full continuity. If the overload protector passes this test, test
the compressor. If not replace the overload protector. Reattach the push-on connectors to the new overload
protector, clip it in place on the compressor and replace the terminal cover.
To test the compressor set a multimeter at RX1, test each of the three terminal pins against each of the other
two. Each pair should show continuity. Then, with the multimeter set at RX1000, place one probe against the
metal housing of the compressor; if necessary, scrape off a little paint to ensure contact with bare metal. Place
the other probe on each of the three terminals in turn. If any of the three terminals shoes continuity with the
housing, the compressor is grounded. If the compressor fails either test, CALL 1-800-621-8560 FOR SER-
VICE. If it passes the tests, reinstall the overload protector, relay, terminal cover and mechanical housing
cover.