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TM 9-4120-389-14
SECTION III
TABLE 5-1. TROUBLESHOOTING
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1. DISCHARGE PRESSURE TOO HIGH
Step 1.
Check for dirty or clogged condenser coil.
Clean condenser coil per paragraph 5-29.
Step 2. Check for refrigerant overcharge.
See paragraph 5-3.
Step 3. Check sight glass for air in refrigerant system.
See paragraph 2-4.
Leak check per paragraph 5-16.
Follow procedure of paragraph 5-16 and continue specific repair.
Step 4. Check operation of condenser fan motor per paragraph 4-25.
Replace defective fan motor per paragraph 4-25.
Step 5. Check to see if condenser fan is loose on shaft.
Follow procedures of paragraph 4-25 to tighten condenser fan on shaft.
2. DISCHARGE PRESSURE TOO LOW
Step 1.
Check too see that cold outside air is not entering the room.
Follow instructions of paragraph 2-7 to limit cold outside air.
Step 2. Check sight glass for low refrigerant charge.
Charge the refrigerant system per paragraph 5-3.
Step 3. Check pressure regulating valve per paragraph 5-18.
Follow procedures of paragraph 5-18 to replace pressure regulating valve.
Step 4. Check compressor operation per paragraph 5-24.
Replace defective compressor per paragraph 5-24.
5-20
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