AIR CONDITIONING (Cont) - TM-55-1905-223-24-170214

TM 55-1905-223-24-17

Table 4-1. Troubleshooting - CONT

Malfunction

Test or Inspection

Corrective Action

AIR CONDITIONING - CONT

High crankcase temperature (compressor extremely hot).

STEP 1.

Check for clogged suction strainer in semi-hermetic type compressor (A/C-2).

Remove motor end cover and strainer.

Remove and clean suction strainer (paragraph 4-19).

Cold or frosted liquid line (or component in the liquid line).

STEP 1.

Check for restriction in the liquid line, or component, at the point of frost or temperature

difference.

Replace frosted ball check valves (paragraph 4-14).

Check and replace other liquid line component as required.

STEP 2.

Check for non-condensables in system.

Purge, or evacuate, and recharge with R-22 (Malfunction 4, or paragraph 4-10).

10.

Compressor will not start.

STEP 1.

Check to see if low pressure control switch is open due to low refrigerant charge (A/C-2;

accommodations).

Check for blown pressure relief valve. Determine cause and replace valve

Repair any leaks, evacuate, and recharge system with R-22 as follows:

(1)

Leak test refrigerant line and components:

WARNING

Turn electrical power OFF.

(2) With the unit shutdown, use the refrigerant gas leak detector in the

refrigeration tool kit and check all lines and components in the system for leaks.

NOTE

Leaks commonly occur in defective joints, fittings, gaskets, and in breaks caused

by vibration.

4-7