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Symptom
F. Noisy compressor
1. Damaged internal parts
2. Liquid floodback (abnormally cold suction
line and low superheat)
3. Liquid refrigerant in compressor at start-up
G. System short of capacity
1. Low charge
2. Clogged filter drier
3. Incorrect expansion valve setting
4. Expansion valve stuck or obstructed
5. Low evaporator water flow
6. Noncondensibles in the system
7. Leaky valves in compressor
H. Suction pressure too low
1. Short of refrigerant
2. Thermostat set too low
3. Low water flow
4. Clogged filter drier
5. Expansion valve faulty
I. Suction pressure too high
1. Excessive cooling load
2. Expansion valve overfeeding
3. Suction valve broken (i.e. noisy compressor)
J. Discharge pressure too low
1. Shortage of refrigerant
2. Broken or leaky compressor discharge valve
K. Discharge pressure too high
1. Condenser airflow restricted
2. Air or noncondensible gas in system
3. Refrigerant overcharge
4. Excessive system load
16
Trouble Shouting
Recommended action
Replace compressor
Check and adjust superheat
a. Check crankcase heater
b. Check for refrigerant overcharge.
Add refrigerant
Replace filter drier
Replace expansion valve
Replace expansion valve
Check strainers. Adjust water flow
Evacuate and recharge system
Replace compressor
Find and repair leak; recharge system
Readjust thermostat
Check strainers and adjust balancing valve.
Replace
Replace
Check for cause of excessive load
a. Verify remote bulb is properly attached
b. Adjust superheat setting
Replace compressor
Find and repair leak.
Replace compressor
Check fan motor, clean coil
Evacuate and recharge system
Recover excess refrigerant
Check cause
CGAT-IOM01-EN
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