Table 4-1. Troubleshooting - TM-5-4120-339-140076

TM 5-4120-339-14

Table 4-1. Troubleshooting (continued)

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

COMPRESSOR WILL NOT START (continued)

Step 3.

Inspect and test circuit breaker (paragraph 3-12m).

Replace damaged or defective circuit breaker.

Step 4.

Inspect and test thermostat (paragraph 3-12d).

Replace damaged or defective thermostat.

Step 5.

Inspect and test selector switch (paragraph 3-12b).

Replace defective or damaged selector switch.

Step 6.

Inspect and test compressor relay (paragraph 3-12f).

Replace defective or damaged compressor relay.

Step 7.

Inspect and test phase sequence relay (paragraph 3-12f).

Replace damaged or defective phase sequence relay.

Step 8.

Inspect for loose electrical connections and defective wiring (figure 3-8).

Tighten loose connections. Repair or replace defective wiring.

Step 9.

Inspect and test high and low pressure cut-out switches (paragraphs 3-13a and 4-12b).

Replace damaged or defective cut-out switch.

Adjust cut-out switch if out of

COMPRESSOR SHORT CYCLES

Step 1.

Check air conditioner operating pressures for excessive refrigerant in system (table 4-3).

Release excess refrigerant from system until proper charge is attained (figure 4-2).

Step 2.

Inspect and test liquid line solenoid valve (paragraph 3-13d).

Repair or replace damaged or defective valve (paragraph 4-17).

4-2