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11. CHECKING ELECTRICAL COMPONENTS
11-1. Measurement of Insulation
Resistance
The insulation is in good condition if the resistance
exceeds 2MΩ.
11-1-1. Power Supply Wires
Clamp the ground wire of the power supply wires with
the lead clip of the insulation resistance tester and
measure 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)
11-1-2. 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.
11-1-3. 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)
11-1-4. 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)
NOTE
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.
Clip
Probe
Clip
Copper
tube or
metallic part
Clip
Copper
tube or
metallic part
Metallic
part
Clip
48
Ground wire
Insulation
tester
Fig. 1
Terminal plate
Insulation
tester
Fig. 2
Probe
Insulation
tester
Fig. 3
From fan motor,
compressor and
other parts
Probe
Insulation
tester
Fig. 4
Probe
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