102
AGZ 026B through 130B
IOMM AGZ-5
PROBLEM
POSSIBLE CAUSES
POSSIBLE CORRECTIVE STEPS
1.
Oil hang-up in piping
1.
Review refrigerant piping and correct.
2.
Low oil level
2.
Check and add oil.
3.
Loose fitting on oil line
3.
Check and tighten system.
4.
Level too high
4.
Adjust thermal expansion valve.
5.
Insufficient water flow - Level too high
5.
Adjust flow.
Compressor Oil
Level Too High Or
Too Low
6.
Excessive liquid in crankcase - Level too high
7. Short
cycling
6.
Check crankcase heater. Reset expansion valve for
higher superheat. Check liquid line solenoid valve
operation.
7.
Stabilize load or increase staging interval.
1.
Lack of refrigerant
1.
Check for leaks and repair. Add refrigerant
2.
Suction superheat too high
2.
Adjust superheat.
Compressor Loses
Oil
3.
Crankcase heater burnout
3.
Replace crankcase heater.
1.
Low voltage during high load conditions
1.
Check supply voltage for excessive line drop.
2.
Defective or grounded wiring in motor
2.
Replace compressor motor.
Motor Overload
Relays or Circuit
Breakers Open
3.
Loose power wiring or burnt contactors
4.
High condenser temperature
5.
Power line fault causing unbalanced voltage
3.
Check all connections and tighten.
4.
See corrective steps for High Discharge Pressure.
5.
Check supply voltage. Notify power company. Do not
start until fault is corrected..
1.
Operating beyond design conditions
2.
Discharge valve partially shut
1.
Add facilities so conditions are within allowable limits.
2. Open
valve.
3.
Blown compressor internal gasket
3.
Replace gasket.
4.
Voltage range or imbalance
4.
Check and correct.
Compressor
Thermal Protection
Switch Open
5. High
superheat
6.
Compressor bearing failure
5.
Adjust to correct superheat.
6.
Replace compressor .
Summary of Contents for AGZ026BS
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