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12. CHECKING ELECTRICAL COMPONENTS
12-1. Measurement of Insulation
Resistance
The insulation is in good condition if the resistance
exceeds 2MΩ.
12-1-1. Power Supply Wires
Clamp the ground wire of the power supply wires with
the lead clip of the insulation resistance tester and mea-
sure the resistance by placing a probe on either of the
power wires. (Fig. 1)
Then measure the resistance between the ground wire
and the other power wire. (Fig. 1)
12-1-2. Indoor Unit
Clamp an aluminum plate fin or copper tube with the lead
clip of the insulation resistance tester and measure the
resistance by placing a probe on each terminal screw on
the terminal plate. (Fig. 2)
Note that the ground line terminal should be skipped for
the check. (Fig. 2)
12-1-3. Outdoor Unit
Clamp a metallic part of the unit with the lead clip of the
insulation resistance tester and measure the resistance
by placing a probe on each terminal screw where power
supply lines are connected on the terminal plate. (Fig. 2)
12-1-4. Measurement of Insulation
Resistance for Electrical Parts
Disconnect the lead wires of the desired electric part
from terminal plate, capacitor, etc. Similarly disconnect
the connector. Then measure the insulation resistance.
(Figs. 3 and 4)
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.
Clip
Probe
Clip
Copper
tube or
metallic part
Clip
Copper
tube or
metallic part
Probe
Metallic
part
Clip
31
Ground wire
Insulation
tester
Terminal plate
Probe
Insulation
tester
Probe
Insulation
tester
From fan motor,
compressor and
other parts
Insulation
tester
Fig. 1
Fig. 2
Fig. 3
Fig. 4
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