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 TM 55-1905-219-14-8
4-5. GENERAL (Continued).
Table 4-6. Air Conditioner Abnormal Operating
Pressures/Temperatures - Troubleshooting (Continued).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Step 4.
Improper operation of solenoid valves.
Check power supply to solenoids. Examine solenoid coil for burn-out. Check settings
of solenoid thermostat. Repair or adjust as required.
Step 5.
Capacity control system set to unload at too low suction pressure.
Adjust capacity control valve to begin unloading at a higher control point.
5.
Compressor crankcase cold (sweating or frosting).
Step 1.
Liquid refrigerant returning to compressor:
a.
Open hand expansion valve.
b.
Refrigerant overcharge.
c.
Defective or improperly adjusted thermal expansion valve.
Stop liquid refrigerant return to compressor:
a.
Close tightly.
b.
Remove excess refrigerant.
c.
Replace or adjust expansion valve to 80 -10 superheat. Examine fastening of
F
thermal bulb, tighten if loose.
Step 2.
Too much oil in circulation.
Remove excess oil. Oil level to be no higher than half-way up on bull's-eye sight
glass.
4-32
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