Table 4-1. Troubleshooting - continued

TM 5-4120-339-14

Table 4-1. Troubleshooting (continued)

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

INSUFFICIENT COOLING (continued)

Step 8.

Inspect and test pressure equalizer solenoid valve (paragraph 3-13c).

Repair or replace damaged or defective pressure equalizer solenoid valve

Step 9.

Replace dehydrator (figure 4-16).

Step 10.

Restriction in liquid line.

Open system and remove refrigerant (figure 4-2), purge system (paragraph 4-8),

evacuate system (figure 4-4), and recharge the system with refrigerant

REFRIGERANT SYSTEM CONTINUOUSLY LOOSING REFRIGERANT

Step 1.

Using available leak detector, check refrigerant tubing and components for leaks.

Repair leaks if possible. Replace unrepairable tubing or components.

Step 2.

Check for defective pressure relief valve (paragraph 4-13).

Replace defective pressure relief valve.

AIR CONDITIONER NOISY DURING OPERATION

Step 1.

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

Release excess refrigerant from system until the proper charge is attained

Step 2.

Check for noisy compressor, indicating worn compressor bearings or insufficient clearance

between rotating compressor components.

Replace compressor (paragraph 4-22).

Step 3.

Inspect expansion valve and check superheat (paragraph 4-15).

Repair or replace damaged or defective expansion valve.

4-4