MALFUNCTION 5

TM 9-4120-428-14

0010 00

MALFUNCTION 5

COMPRESSOR WILL NOT START

SYMPTOM

The compressor will not start.

MALFUNCTION

The compressor, control circuit breaker, and selector switches are not properly set.

CORRECTIVE ACTION

Reset the controls.

The contacts of the HIGH-or-LOW cut out switches are open.

CORRECTIVE ACTION

Reset the pressure switches. Notify your supervisor if condition continues.

There are loose electrical connections or faulty wiring.

CORRECTIVE ACTION

Tighten any loose connections and fix any faulty wiring. (WP 0028 00) and (WP

The control circuit breakers or selector switches are not properly set.

CORRECTIVE ACTION

Conduct continuity checks on the control circuit breakers or selector swi tches to

ensure they are properly set. If necessary, fix any open circuits and replace

wires.

The phase sequence relay is not operating properly.

CORRECTIVE ACTION

If necessary, replace bad relay.

There is no continuity across primary and secondary winding of the control transformer for

defective windings.

CORRECTIVE ACTION

If necessary, replace transformer. (WP 0049 00).

The forward and reverse resistances of the rectifier assembly diodes are not operating properly.

CORRECTIVE ACTION

If necessary, replace the bad rectifier. (WP 0048 00).

The operation of the time delay relay is not timed correctly.

CORRECTIVE ACTION

Observe the operation of the time delay relay. If necessary, replace the bad

The compressor relay is not operating properly.

CORRECTIVE ACTION

Substitute the compressor relay, known to be good, check the operation and

replace the bad relay if necessary.

0010 00-4