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8. CHECKING ELECTRICAL COMPONENTS
8-1. Measurement of Insulation
Resistance
The insulation is in good condition if the resistance
exceeds 2MΩ.
8-1-1. Power Cord and Unit
Clamp the grounding prong of the power plug with a lead
clip of the insulation resistance tester and measure the
resistance by placing a probe on either of the two power
blade. (Fig. 1)
Then, also measure the resistance between the grounding
prong and other power blade. (Fig. 1)
8-1-2. Measurement of Insulation Resistance
for Electrical Parts
Disconnect the lead wires of the desired electric part from
terminal plate, switch, capacitor, etc. Similarly disconnect
the connector. Then measure the insulation resistance.
(Figs. 2 to 3)
Refer to Electric Wiring Diagram.
NOTE
If the probe cannot enter the poles because the hole is too
narrow then use a probe with a thinner pin.
Power plug
(Field supply)
Ground
Probe
NOTE
The shape of the power plug may differ from that of
the air conditioner which you are servicing.
Clip
Copper
tube or
metallic part
Metallic
part
Clip
19
Insulation tester
Probe
Insulation
tester
From fan motor,
compressor and
other parts
Probe
Insulation
tester
Fig. 1
Fig. 2
Fig. 3
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