TM 9-4120-402-14
SYMPTOM INDEX
Trouble
Malfunction No.
AIR CONDITIONER
Insufficient Cooling Action .................................................................................
.
3
Air Conditioner Noisy During Operation.............................................................
.
7
Unit Operates Continuously On Cooling Cycle ..................................................
.
5
COMPRESSOR
Compressor Will Not Start .................................................................................
1
Compressor Short Cycles...................................................................................
2
REFRIGERANT SYSTEM
Refrigerant System Continuously Losing Refrigerant ........................................
..
4
Sight Glass Appears Yellow Instead of Green....................................................
6
Table 5-1. DIRECT SUPPORT TROUBLESHOOTING
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1. COMPRESSOR WILL NOT START.
Step 1. Check that the LOW and HIGH PRESSURE CUTOUT switches are not tripped.
Press and release the HIGH PRESSURE CUTOUT switch to RESET. If switch does not remain in,
check and replace switch if defective. (See paragraph 5-25.) Check and replace low pressure cutout
Replace compressor if windings are defective.
2. COMPRESSOR SHORT CYCLES.
WARNING
Use great care to avoid contact with liquid refrigerant or refrigerant gas being discharged from
any container under pressure. Sudden and irreversible tissue damage can result from freezing.
Wear gloves and a face protector or safety glasses in any situation where skin or eye contact is
possible.
Prevent contact of refrigerant gas with flame or hot metal surfaces. Heat causes the refrigerant
to break down and form carbonyl chloride (phosgene), a highly toxic and corrosive gas.
a.
If pressure is too high, check HIGH PRESSURE CUTOUT switch and replace if defective.
(See
b. If pressure is excessive and sight glass is clear, release excess refrigerant. (See paragraph 5-11.)
5-4