80
AGZ 025D through 190D
OMM 1166-1
PROBLEM
POSSIBLE CAUSES
POSSIBLE CORRECTIVE STEPS
Compressor Oil
Level Too High
Or Too Low
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.
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.
Compressor
Loses Oil
1.
Lack of refrigerant
1.
Check for leaks and repair. Add refrigerant
2.
Suction superheat too high
2.
Adjust superheat.
3.
Crankcase heater burnout
3.
Replace crankcase heater.
Motor Overload
Relays or Circuit
Breakers Open
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.
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..
Compressor
Thermal
Protection Switch
Open
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.
5.
High superheat
6.
Compressor bearing failure
5.
Adjust to correct superheat.
6.
Replace compressor .
Summary of Contents for AGZ 190D
Page 12: ...12 AGZ 025D through 190D OMM 1166 1 Figure 2 Typical Field Control Wiring...
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