Troubleshooting Chart - Daikin WGZ030DW Installation And Maintenance Manual

Table 41: Troubleshooting Chart

Troubleshooting Chart

PROBLEM
Main sw itch, circuit breakers open.
Fuse blow n.
Thermal overloads tripped or fuses blow n.
Compressor Will Not
Defective contactor or coil.
Run
System shut dow n by equipment protection devices.
No cooling required.
Liquid line solenoid w ill not open.
Motor electrical trouble.
Loose w iring.
Flooding of refrigerant into crankcase.
Compressor Noisy or
Improper piping support on suction or liquid line.
Vibrating
Worn compressor.
Condenser w ater insufficient or temperature too high.
Fouled condenser tubes (w ater-cooled condenser). Clogged spray nozzles
(evaporative condenser). Dirty tube and fin surface (air cooled condenser).
High Discharge
Noncondensables in system.
Pressure
System overcharge w ith refrigerant.
Discharge shutoff valve partially closed.
Condenser undersized (air-cooled).
High ambient conditions.
Faulty condenser temp. regulation.
Insufficient refrigerant in system.
Low Discharge
Low suction pressure.
Pressure
Condenser too large.
Low ambient conditions.
Excessive load.
High Suction Pressure
Expansion valve overfeeding.
Lack of refrigerant.
Evaporator dirty.
Clogged liquid line filter-drier.
Clogged suction line or compressor suction gas strainers.
Low Suction Pressure
Expansion valve malfunctioning.
Condensing temperature too low .
Compressor w ill not unload.
Insufficient w ater flow .
Clogged suction oil strainer.
Excessive liquid in crankcase.
Little or No Oil Pressure
Low oil level.
Flooding of refrigerant into crankcase.
Lack of refrigerant.
Compressor Loses Oil Velocity in risers too low (A-C only).
Oil trapped in line.
Low voltage during high load conditions.
Defective or grounded w iring in motor or pow er circuits.
Motor Overload Relays Loose pow er w iring.
or Circuit Breakers
High condensing temperature.
Open
Pow er line fault causing unbalanced voltage.
High ambient temperature around the overload relay
Operating beyond design conditions.
Compressor Thermal
Sw itch Open
Discharge valve partially shut.
Thermostat set too low .
Freeze Protection
Low w ater flow .
Opens
Low suction pressure.
IM 1131-2
POSSIBLE CAUSES
Troubleshooting Chart
POSSIBLE CORRECTIVE STEPS
Close sw itch
Check electrical circuits and motor w inding for shorts or grounds.
Investigate for possible overloading. Replace fuse or reset breakers
after fault is corrected.
Overloads are auto reset. Check unit closely w hen unit comes back
on line.
Repair or replace.
Determine type and cause of shutdow n and correct it before resetting
protection sw itch.
None. Wait until unit calls for cooling.
Repair or replace coil.
Check motor for opens, short circuit, or burnout.
Check all w ire junctions. Tighten all terminal screw s.
Check superheat setting of expansion valve.
Relocate, add or remove hangers.
Replace.
Readjust temperature control or w ater regulating valve. Investigate
w ays to increase w ater supply.
Clean.
EPA purge the noncondensables.
Remove excess refrigerant.
Open valve.
Check condenser rating tables against the operation.
Check condenser rating tables against the operation.
Check condenser control operation.
Check for leaks. Repair and add charge.
See corrective steps for low suction pressure below .
Check condenser rating table against the operation.
Check condenser rating tables against the operation.
Reduce load or add additional equipment.
Check remote bulb. Regulate superheat.
Check for leaks. Repair and add charge.
Clean chemically.
Replace cartridge(s).
Clean strainers.
Check and reset for proper superheat. Replace if necessary.
Check means for regulating condensing temperature.
See corrective steps for failure of compressor to unload.
Adjust flow .
Clean.
Check crankcase heater. Reset expansion valve for higher
superheat. Check liquid line solenoid valve operation.
Add oil.
Adjust thermal expansion valve.
Check for leaks and repair. Add refrigerant.
Check riser sizes.
Check pitch of lines and refrigerant velocities.
Check supply voltage for excessive line drop.
Replace compressor-motor.
Check all connections and tighten.
See corrective steps for high discharge pressure.
Check Supply voltage. Notify pow er company. Do not start until fault
is corrected.
Provide ventilation to reduce heat.
Add facilities so that conditions are w ithin allow able limits.
Open valve.
Reset to 42°F (6°C) or above.
Adjust flow .
See "Low Suction Pressure."
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