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 TM 55-1905-220-14-8
4-5. GENERAL (Continued).
Table 4-7. Air Conditioner Erratic Operation Troubleshooting (Continued).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Step 8. Solenoid valve will not open preventing low pressure control switch from closing.
Turn on electric power to solenoid valve. Examine solenoid coil. If burned out or defective
replace.
Step 9. Lack of refrigerant. With little or no refrigerant, suction pressure will be too low and low pressure
control switch will not close.
Recharge system and repair any leaks.
Step 10. Condenser water pressure failure switch opened. (If provided).
Provide adequate condenser water flow and pressure.
2. Compressor short cycles or high pressure cut-out.
Step 1. Insufficient water flow through condenser or clogged condenser.
Open any valves in water supply line or adjust water regulating valve to increase flow.
Check water strainer and condenser tubes. Clean as required.
Step 2. High pressure control switch set to cut-out at too low head pressure.
Reset high pressure control switch to cut-out at not less than 175 psig.
Step 3. Refrigerant overcharge. Too much refrigerant will reduce condenser capacity and cause
high head pressure.
Remove excess refrigerant.
Step 4. Air or noncondensable gas in system.
Purge through condenser purge valve.
4-35
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