Daikin AGZ 025D Operating & Maintenance Manual page 80

PROBLEM
1.
2.
3.
Compressor Oil
4.
Level Too High
5.
Or Too Low
6.
7.
1.
Compressor
2.
Loses Oil
3.
1.
2.
Motor Overload
3.
Relays or Circuit
4.
Breakers Open
5.
1.
Compressor
2.
Thermal
3.
Protection Switch
4.
Open
5.
6.
80
POSSIBLE CAUSES
Oil hang-up in piping
Low oil level
Loose fitting on oil line
Level too high
Insufficient water flow - Level too high
Excessive liquid in crankcase - Level too high
Short cycling
Lack of refrigerant
Suction superheat too high
Crankcase heater burnout
Low voltage during high load conditions
Defective or grounded wiring in motor
Loose power wiring or burnt contactors
High condenser temperature
Power line fault causing unbalanced voltage
Operating beyond design conditions
Discharge valve partially shut
Blown compressor internal gasket
Voltage range or imbalance
High superheat
Compressor bearing failure
1. Review refrigerant piping and correct.
2. Check and add oil.
3. Check and tighten system.
4. Adjust thermal expansion valve.
5. Adjust flow.
6. Check crankcase heater. Reset expansion valve
for higher superheat. Check liquid line solenoid valve
operation.
7. Stabilize load or increase staging interval.
1. Check for leaks and repair. Add refrigerant
2. Adjust superheat.
3. Replace crankcase heater.
1. Check supply voltage for excessive line drop.
2. Replace compressor motor.
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. Add facilities so conditions are within allowable
limits.
2. Open valve.
3. Replace gasket.
4. Check and correct.
5. Adjust to correct superheat.
6. Replace compressor .
AGZ 025D through 190D
POSSIBLE CORRECTIVE STEPS
OMM 1166-1