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12-1. Measurement of Insulation
Resistance
●
The insulation is in good condition if the resistance
exceeds 1MΩ.
12-1-1. Power supply wires
Clamp the grounding terminal of the power plug with
the lead clip of the insulation resistance tester and
measure the resistance by placing a probe on either
of the two power wires. (Fig. 1)
Then also measure the resistance between the
grounding and other power terminals. (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 mea-
sure the resistance by placing a probe on each termi-
nal screw where power supply lines are connected on
the terminal plate. (Fig. 2)
12-1-3. Outdoor unit
Clamp an aluminum plate fin or copper tube with the
lead clip of the insulation resistance tester and mea-
sure the resistance by placing a probe on each termi-
nal screw on the terminal plate. (Fig. 2)
Note that the ground line terminal should be skipped
for the check.
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 discon-
nect the connector. Then measure the insulation
resistance. (Figs. 3 and 4)
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.
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