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8. CHECKING ELECTRICAL COMPONENTS
●
The shape of the power plug may differ from that of
the air conditioner which you are servicing.
NOTE
Power plug
Ground
Probe
Insulation tester
Fig. 1
8-1. Measurement of Insulation
Resistance
●
The insulation is in good condition if the resistance
exceeds 2M
Ω
.
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.
If the probe cannot enter the poles because the hole is too
narrow then use a probe with a thinner pin.
NOTE
Copper
tube or
metallic part
Clip
Insulation
tester
Probe
Fig. 2
Clip
Insulation
tester
Probe
Metallic
part
From fan motor,
compressor and
other parts
Fig. 3
