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 TM 5-4120-355-14
Step 6. Check if high and low pressure switches are good.
Replace defective pressure switch (paras 4-35 and 4-36).
Step 7. Check if thermostat is operating correctly.
Replace defective thermostat (para 4-27).
2.
COMPRESSOR CYCLES INTERMITTENTLY
Step 1. Check for a leaking thermostatic expansion valve.
Replace defective valve (para 4-46).
Step 2. Check setting of low pressure switch.
Reset if setting is too high.
Step 3. Check if there is sufficient refrigerant in system.
Add refrigerant (para 5-9).
Step 4. Check for a leaking thermostatic expansion valve.
Fit leak or replace valve.
Step 5. Check if pressure switch is faulty.
Repair or replace pressure switch (para 4-35 and 4-36).
Step 6. Check for excess refrigerant.
Remove excess refrigerant (para 5-9).
3.
HIGH DISCHARGE PRESSURE
Step 1. Check if condenser fan is operating.
Check fan motor and condenser coil and replace if defective (para 4-1 9).
Step 2. Check for excess refrigerant.
Remove excess refrigerant (para 5-9).
Step 3. Check for air in system (para 5-9).
Evacuate system.
4.
LOW DISCHARGE PRESSURE
Step 1. Check if suction line is obstructed.
Clean the line.
6.
Step 1. Check if expansion valve is improperly set or defective.
Reset or replace expansion valve (para 4-46).
6.
LOW SUCTION PRESSURE
Step 1. Check for sufficient refrigerant.
Add refrigerant (para 5-9).
Step 2. Check for excessive superheat.
Reset expansion valve (para 4-46).
7.
COMPRESSOR NOISY
Step 1. Defective compressor.
Replace compressor if play is found in the bearings (para 5-13).
Step 2. Check if bearings are worn.
Replace compressor if play is found in the bearings (para 5-13).
CYLINDERS AND CRANKCASE SWEATING
8.
Step 1. Probably due to flood back. Check refrigerant charge and expansion valves.
Adjust refrigerant charge or replace defective expansion valve.
5-2
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