DIRECT SUPPORT TROUBLE SHOOTING.

TM 5-4120-386-14

5-2. DIRECT SUPPORT TROUBLE SHOOTING.

Table 5-l. Direct support troubleshooting.

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

1. COMPRESSOR WILL NOT START.

Make continuity check of control circuit, See Figures E-1 and E-2 for

Step 1.

control circuit schematic and wiring diagrams.

Repair loose or broken connections, replace bad components.

(Refer to paragraph 4-24, 4-25 and 4-26.)

Make continuity check of circuit breaker.

Step 2.

Replace bad circuit breaker. (Refer to paragraph 4-24.)

Step 3. Check continuity or compressor motor leads, and leads to casing using

Replace bad compressor. (Refer to paragraph 5-28.)

Step 4. Check continuity of high and low pressure switches at a room

temperature. Continuity should exist.

If continuity does not exist, press reset button and recheck.

Replace faulty high or low pressure switch. (Refer to

Step 5. Check polarity of power input plug (P1) using voltmeter. With positive

(+) lead in pin A and negative (-) lead in pin B, voltage should be 208

VAC. With positive (+) lead pin A and negative (-) lead in pin D,

voltage should be 208 VAC. With positive (+) lead in pin B and negative

(-) lead in pin D, voltage should be zero volts.

Replace power input plug (P1) which does not pass above test,

5-2