Unique WS Series, Service Manual

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WS
Series
Advanced air conditioning systems
10.4 Poor Cooling Troubleshooting.
Symptom Probable Cause Corrective Action
1 Refrigerant flow
failure
1. Refrigerant gas shortage.
2.
Excessive overcharging of
refrigerant.
3.
Gas leakage.
4.
Clogging of strainer or
capillary tube.
5.
4-Way valve is defective.
6.
Solenoid 4-Way valve is
defective.
7.
Compressor is defective.
1. Charge refrigerant gas.
2.
Recharge gas.
3.
Repair leakage.
4.
Replace strainer.
5.
Replace 4-Way valve.
6.
Replace solenoid.
7.
Replace compressor.
2
Air circulation
failure.
1. Air filter is clogged
2. Air shutters are closed.
1. Clean air filter.
2. Open air discharge shutters.
3
Freezing
Conditions at
Evaporator Coil 1. Clogged air filter
2. Faulty capacitor.
3. Faulty fan motor.
4. Air discharge shutters are too
closed.
5. Lack of refrigerant.
1. Clean filter.
2. Replace capacitor.
3. Replace fan motor.
4. Open air discharge shutters.
5. Check for leaks and add
refrigerant.