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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 5.
Refrigerant overcharge. Condenser tubes submerged in liquid refrigerant.
Remove excess refrigerant.
Step 6.
Compressor discharge stop valve partially closed.
Open valve fully.
2.
Low head pressure.
Step 1.
Condenser water inlet temperature too low.
Reduce water flow by adjusting water regulating valve.
Step 2.
Excessive water flow through condenser.
Adjust water regulating valve.
Step 3.
Liquid refrigerant flooding back from evaporator. Defective or improperly set
thermal expansion valve.
Replace or adjust expansion valve to 80 - 10 superheat.
F
Examine
fastening of thermal bulb. Close hand expansion valves tightly.
Step 4.
Compressor suction stop valve partially closed.
Open valve fully.
Step 5.
Leaky compressor discharge valve.
Test for leaks. If leaking, pump down, remove cylinder head, examine valve
and replace if necessary.
Step 6.
Leaky compressor suction valves.
Pump down, remove cylinder head, examine valve discs and valve seats.
Replace if necessary.
Step 7.
Worn piston rings.
Replace if worn.
4-30
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