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TM 5-4120-386-14
Table 4-2. Organizational Troubleshooting-Continued.
--
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1. AIR CONDITIONER FAILS TO OPERATE - Continued
Check to see whether control or compressor circuit breaker is in OFF
Step 6.
position or is defective.
Make continuity check with ohmmeter. Reset circuit
breaker. (Refer to paragraph 4-25.7.)
Disconnect control circuit transformer and make continuity check of
Step 7.
primary and secondary windings, and from windings to case, using
ohmmeter. Reset circuit breaker.
If windings do not show continuity, or if windings-to-case
continuity exists, replace transformer. (Refer to paragraph
Step 8. Apply 30-volt AC to input side terminals of control circuit rectifier,
and check to see that 24-28 volts DC exists at end terminals.
Replace bad rectifier. (Refer to paragraph 4-28.)
2. INSUFFICIENT COOLING
Step 1.
Check to see that mode selector switch is properly positioned.
Step 2. Check liquid sight indicator level to see that refrigerant is colorless and
clear. Yellow indicates moisture in system. Milky or bubbly
refrigerant indicates low level refrigerant charge.
Report condition to direct support maintenance personnel.
Inspect condenser coil for dirt.
Step 3.
Compressed air used for cleaning purposes will not exceed 30 psi (2.1
k g / c m2). Do not direct compressed air against skin. Use goggles or full
face shield.
Clean coil with 25-30 psi (1.76 -2.11 kg/cm2) compressed air.
4-14

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