Troubleshooting Chart - Daikin WGZ030DW Operating And Maintenance Manual

Troubleshooting Chart

PROBLEM
1.
2.
3.
Compressor Will 4.
Not Run 5.
6.
7.
8.
9.
1.
Compressor
2.
Noisy or Vibrating
3.
15. Condenser water insufficient or
16. Fouled condenser tubes (water-cooled
High Discharge
Pressure 17. Noncondensables in system.
18. System overcharge with refrigerant.
19. Discharge shutoff valve partially closed.
20. Condenser undersized (air-cooled).
21. High ambient conditions.
1.
2.
3.
Low Discharge
Pressure 4.
5.
1.
High Suction
Pressure
2.
1.
2.
3.
4.
Low Suction 5.
Pressure
6.
7.
8.
1.
2.
Little or No Oil
Pressure
3.
4.
84
POSSIBLE CAUSES
Main switch, circuit breakers open.
Fuse blown.
Thermal overloads tripped or fuses
blown.
Defective contactor or coil.
System shut down by equipment
protection devices.
No cooling required.
Liquid line solenoid will not open.
Motor electrical trouble.
Loose wiring.
Flooding of refrigerant into crankcase.
Improper piping support on suction or
liquid line.
Worn compressor.
temperature too high.
condenser). Clogged spray nozzles
(evaporative condenser). Dirty tube and
fin surface (air cooled condenser).
Faulty condenser temp. regulation.
Insufficient refrigerant in system.
Low suction pressure.
Condenser too large.
Low ambient conditions.
Excessive load.
Expansion valve overfeeding.
Lack of refrigerant.
Evaporator dirty.
Clogged liquid line filter-drier.
Clogged suction line or compressor
suction gas strainers.
Expansion valve malfunctioning.
Condensing temperature too low.
Compressor will not unload.
Insufficient water flow.
Clogged suction oil strainer.
Excessive liquid in crankcase.
Low oil level.
Flooding of refrigerant into crankcase.
POSSIBLE CORRECTIVE STEPS
1. Close switch
2. Check electrical circuits and motor
winding for shorts or grounds.
Investigate for possible overloading.
Replace fuse or reset breakers after fault
is corrected.
3. Overloads are auto reset. Check unit
closely when unit comes back on line.
4. Repair or replace.
5. Determine type and cause of shutdown
and correct it before resetting protection
switch.
6. None. Wait until unit calls for cooling.
7. Repair or replace coil.
8. Check motor for opens, short circuit, or
burnout.
9. Check all wire junctions. Tighten all
terminal screws.
5. Check superheat setting of expansion
valve.
6. Relocate, add or remove hangers.
7. Replace.
17. Readjust temperature control or water
regulating valve. Investigate ways to
increase water supply.
18. Clean.
19. EPA purge the noncondensables.
20. Remove excess refrigerant.
21. Open valve.
22. Check condenser rating tables against
the operation.
23. Check condenser rating tables against
the operation.
1. Check condenser control operation.
2. Check for leaks. Repair and add charge.
3. See corrective steps for low suction
pressure below.
4. Check condenser rating table against the
operation.
5. Check condenser rating tables against
the operation.
1. Reduce load or add additional
equipment.
2. Check remote bulb. Regulate superheat.
1. Check for leaks. Repair and add charge.
2. Clean chemically.
3. Replace cartridge(s).
4. Clean strainers.
5. Check and reset for proper superheat.
Replace if necessary.
6. Check means for regulating condensing
temperature.
7. See corrective steps for failure of
compressor to unload.
8. Adjust flow.
1. Clean.
2. Check crankcase heater. Reset
expansion valve for higher superheat.
Check liquid line solenoid valve
operation.
3. Add oil.
4. Adjust thermal expansion valve.
OM 1130-2