Purpose
Judgment of the fault of the
compressor.
Items for checking
1. Measurement of insulation resistance
between the compressor and panel.
2. Measurement of phase resistance.
3. Wiring Check.
■ How to check the insulation resistance between the compressor and panel
Measure the resistance between a compressor terminal
and panel.
1. Turn the switch of the tester to “Resistance" mode and check the resistance
2. Measure the resistance between the terminals.
3. “0 Ω” means the short of compressor phase. (Replace the compressor)
4. Refer to the compressor resistance standards.
5. If any disorder is found, measure the line resistance between the terminals of the compressor as shown
below.
6. If the compressor is found to be normal, any compressor connection wire may have a fault.
Terminal
Insulation
Resistance
U-panel ≥ 10 MΩ
V-panel ≥ 10 MΩ
W-panel ≥ 10 MΩ
Compressor
terminals
C/Box Panel
CompPipe
Checking compressor phase resistance
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