5 Air Conditioner Performance Evaluation
5.1. Cooling
Intake & Discharge Air
Temperature Difference
Current Drain
Determination
Remedy
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8°C and over (14.4°F)
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As specified.
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Nothing wrong.
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None.
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8°C and over (14.4°F)
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Higher than specified.
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Nothing wrong, outdoor
temperature is too high, heat
radiation is not efficient.
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Improve heat radiation.
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Under 8°C (14.4°F)
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Higher than specified.
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Something is preventing heat
radiation.
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Excessive amount of refrigerant.
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Improve heat radiation.
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Under 8°C (14.4°F)
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Lower than specified.
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Leakage of refrigerant or
refrigerant system is blocked.
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Locate and repair leak.
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Flush refrigeration cycle.
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Under 8°C (14.4°F)
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Higher than specified by
50%.
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Compressor defect or
compressor capacitor defect.
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Replace the compressor or
compressor capacitor.
Note: Room air humidity is relatively higher, the temperature difference will be smaller.
5.2. Heating
Intake & Discharge Air
Temperature Difference
Current Drain
Determination
Remedy
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14°C and over (25.2°F)
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As specified.
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Nothing wrong.
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None.
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14°C and over (25.2°F)
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Higher than specified.
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Nothing wrong, outdoor
temperature is high.
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Something is preventing heat
radiation at indoor heat
exchanger.
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None.
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Clean air filter.
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Under 14°C (25.2°F)
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Lower than specified.
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Nothing wrong, outdoor
temperature is low.
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Something is preventing heat
radiation at outdoor heat
exchanger.
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Leakage of refrigerant.
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Refrigerant system is blocked.
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None.
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Improve heat radiation at outdoor
heat exchanger.
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Locate and repair leak.
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Flush refrigeration cycle.
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Under 14°C (25.2°F)
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Higher than specified by
50%.
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Compressor defect.
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Compressor capacitor defect
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Replace the compressor.
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Replace the compressor
capacitor.
Note: Room air humidity is relatively higher, the temperature difference will be smaller.
6 Troubleshooting Guide
Warning: Disconnect unit from electrical power supply before making any electrical checks.
Trouble
Check
Result
Cause
Remedy
Fan Motor and
Compressor won’t run.
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Supply Voltage
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Fuse Box or Circuit
Breaker.
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Power cord or
Wiring Harness.
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Temperature
Setting.
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Less than 10% by
Rated.
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Open Contacts.
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Pulled loose or
Shorted.
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Higher than room
temperature
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Temporary or Permanent?
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Customer Restarted unit
immediately without waiting
3 minutes.
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Consult ELECTRICIAN, if
permanent.
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WAIT FOR 3 MINUTES.
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Repair Open Circuit.
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Repair or Replace it.
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Set it LOWER.
Fan Motor won’t run
(Compressor run).
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Objects around
Fan.
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RESISTANCE
between Wires.
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Capacitor Fan
Motor.
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Main Control
Switch.
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Locked Fan.
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Shorted / Open
circuit.
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OHM Meter doesn’t
Deflect.
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No contacts at
Position Shown.
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Fan Hitting Cowling
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Foreign Materials.
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Frozen Bearings.
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Shorted or Burned out.
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Capacitor Defect.
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Main Control Switch defect.
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Adjust Fan position setting
screw.
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Remove Foreign Materials.
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Replace Fan Motor.
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Replace Fan Motor.
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Replace Capacitor Fan.
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Replace Main Control
Switch.
6
CW-A90VE / CW-A120VE
