Air Conditioner Performance Evaluation; Troubleshooting Guide - Panasonic CW-A90VE Service Manual

CW-A90VE / CW-A120VE

5 Air Conditioner Performance Evaluation

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