Section II: DIRECT SUPPORT TROUBLESHOOTING

TM 5-4120-341-13

D I R E C T SUPPORT TROUBLESHOOTING

Section II.

5-5. GENERAL

a. This section provides information useful in diagnosing and correcting unsatisfactory operation or

failure of the air conditioner. Each malfunction is followed by a list of probable causes and actions to take

to remedy the malfunction. You should perform the tests/inspections and corrective actions in the order

listed.

b. This manual cannot list all malfunctions that may occur; nor all tests or inspections and corrective

actions. If a malfunction is not listed or is not corrected by listed corrective actions, notify your supervisor.

5-6. DIRECT SUPPORT TROUBLESHOOTING TABLE

Malfunction

Test or Inspection

Corrective Action

COMPRESSOR

1. COMPRESSOR WILL NOT START

Step 1.

Check compressor for proper operation and damage.

Replace defective compressor (para. 5-9).

2. COMPRESSOR CYCLES INTERMITTENTLY

Step 1.

Inspect sight glass for proper amount of refrigerant.

Add refrigerant as required (para. 5-8).

Step 2.

Check for high discharge pressure.

Discharge refrigerant from system (para. 5-8).

Step 3.

Check for air in refrigerant system,

Purge refrigerant system (para. 5-8).

AIR CONDITIONER

1. HIGH DISCHARGE PRESSURE

Step 1.

Check for excessive refrigerant in s stem.

Discharge refrigerant from system 1'

Step 2.

Check for air in refrigerant system.

Purge refrigerant system (para. 5-8).

2. LOW DISCHARGE PRESSURE

Step 1.

Check to see if compressor is pumping,

Replace defective compressor (para. 5-9).

Inspect sight glass for proper amount of refrigerant.

Step 2.

Add refrigerant as required (para. 5-8).