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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.
If the probe cannot enter the poles because the hole is
too narrow then use a probe with a thinner pin.
NOTE
Power plug
Ground
Probe
Insulation tester
Fig. 1
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
Fig. 4
8. CHECKING ELECTRICAL COMPONENTS
The shape of the power plug may differ from that
of the air conditioner which you are servicing.
NOTE