Refrigeration Cycle Diagram; Air Conditioner Performance Evaluation; Troubleshooting Guide - Panasonic CW-C180EF-W Service Manual

CW-C180EF-W / CW-C240EF / CW-C180EF-M / CW-SC180EF

4 Refrigeration Cycle Diagram

5 Air Conditioner Performance Evaluation

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.

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).
Compressor won't run
(Fan run).
Current Drain
• As specified.
• Higher than 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.
• Thermostat Setting. • Higher than room
temp.
• 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.
• Thermostat setting. • Higher than room
temp.
• RESISTANCE
• Shorted.
between Terminal
and the
• Shorted.
Compressor Body.
• Infinity between
• RESISTANCE
Terminals.
between Terminals.
• OHM Meter doesn't
• Overload Protector.
deflect.
• Capacitor
• No click heard.
Compressor.
• No contacts at
• Thermostat.
Position Shown.
• Main Control
Switch.
CW-C180EF-W, CW-C180EF-
M & CW-SC180EF
Item Pressure
(MPa)
A 2.09 ~ 2.19
B 1.94 ~ 2.04
C 0.54 ~ 0.63
D 0.48 ~ 0.54
Note: Indoor temperature at 27°C (DB), 19°C (WB) and Outdoor at
35°C (DB), 24°C (WB) for Cooling.
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.
Result Cause
• Temporary or Permanent?
• Customer Restarted unit
immediately without waiting
3 minutes.
• Fan Hitting Cowling or
• Foreign Materials.
• Frozen Bearings.
• Shorted or Burned out.
• Capacitor Defect.
• Main Control Switch defect.
• Winding Coil touched to the
compressor shell.
• Rear Shorted or Burnt out.
• Overload Protector defect.
• Capacitor defect.
• Thermostat defect.
• Main Control Switch defect.
6
CW-C240EF
Temperature Pressure
(°C) (MPa)
64 ~ 83 2.23 ~ 2.30
38 ~ 48 2.01 ~ 2.16
8 ~ 12.5 0.52 ~ 0.56
5.5 ~ 13.5 0.50 ~ 0.54
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
• Consult ELECTRICIAN, If
permanent.
• Repair Open Circuit.
• WAIT FOR 3 MINUTES.
• 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.
• Set it lower.
• Replace Compressor.
• Replace Compressor.
• Replace Overload
Protector.
• Replace Capacitor
Compressor.
• Replace Thermostat.
• Replace Main Control
Switch.
Temperature
(°C)
72 ~ 88
35 ~ 45
6.5 ~ 10.5
4 ~ 12