Daikin WGZ200DW - Troubleshooting Chart

84 OM 1130-2
Troubleshooting Chart
PROBLEM
POSSIBLE CAUSES
POSSIBLE CORRECTIVE STEPS
Compressor Will
Not Run
1. Main switch, circuit breakers open.
2. Fuse blown.
3. Thermal overloads tripped or fuses
blown.
4. Defective contactor or coil.
5. System shut down by equipment
protection devices.
6. No c
ooling required.
7. Liquid line solenoid will not open.
8. Motor electrical trouble.
9. Loose wiring.
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.
Compressor
Noisy or Vibrating
1. Flooding of refrigerant into crankcase.
2. Impr
oper piping support on suction or
liquid line.
3. Worn compressor.
5. Check superheat setting of expansion
valve.
6. Relocate, add or remove hangers.
7. Replace.
High Discharge
Pressure
15. Condenser water insufficient or
temperature too high.
16. Fouled condenser tubes (water-cooled
condenser). Clogged spray nozzles
(evaporative condenser). Dirty tube and
fin surface (air cooled condenser).
17. Noncondensables in system.
18. System overcharge with refrigerant.
19. Discharge shutoff valve partially closed.
20. Condenser undersized (air-cooled).
21. High a
mbient conditions.
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.
Low Discharge
Pressure
1. Faulty condenser temp. regulation.
2. Insufficient refrigerant in system.
3. Low suction pressure.
4. Condenser
too large.
5. Low am
bient conditions.
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.
High Suction
Pressure
1. Excessive load.
2. Expansion valve overfeeding.
1. Reduce load or add additional
equipment.
2. Check remote bulb. Regulate superheat.
Low Suction
Pressure
1. Lack of refrigerant.
2. Evaporator dirty.
3. Clogged liquid line filter-drier.
4. Clogged suction line or compressor
suction gas strainers.
5. Expansion valve malfunctioning.
6. Condensi
ng temperature too low.
7. Compr
essor will not unload.
8. Insufficient water flow.
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.
Little or No Oil
Pressure
1. Clogged suction oil strainer.
2. Excessive liquid in crankcase.
3. Low oil
level.
4. Flooding of refrigerant into crankcase.
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.