COMPRESSOR WILL NOT START - TM-9-4120-430-140078

TM 9-4120-430-14

0013 00

FAULT PROCEDURE 3. COMPRESSOR WILL NOT START - Continued

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

COMPRESSOR WILL NOT START

Step 2.

Check for open contacts of high-or-low-pressure cut-out switches (S4 and S5). (Refer to figure 1 and

Check continuity of S4 and S5-pressure cut-out switches.

If continuity is found on the S4 low pressure switch, report fault to Direct Support Maintenance

personnel if condition continues.

Figure 1. S4 and S5 Cutout Switches Location

Step 3.

Check for loose electrical connections.

Tighten loose connections. If wiring replacement is necessary, notify direct support.

Step 4.

Make continuity check of control circuit to determine whether open circuit exists. (Refer to WP 0038

Repair open circuit or replace wire. (Refer to WP 0031 00.)

Step 5.

Check continuity across primary winding and across secondary winding of control transformer to see

whether windings are good. (Refer to WP 0030 00.)

Replace bad transformer. (Refer to WP 0030 00.)

Step 6.

Observe operating of time delay device and check continuity. (Refer to WP 0028 00.)

Replace bad time delay device. (Refer to WP 0028 00.)

Step 7.

Check that the Mode Selector switch is in the COOL position.

Switch to COOL position. Replace bad Mode Selector switch. (Refer to WP 0026 00.)

0013 00-4