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8. Checking Electrical Components
8.1 Measure insulation resistance
The insulation is in good condition if the resistance exceeds 2
M
Ω
.
8.1.1 Power supply wires
Clamp the ground pins 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 power wires. (Fig. 1)
Then measure the resistance between the
ground wire and the other power wire. (Fig. 1)
8.1.2 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.
8.1.3 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)
8.1.4 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. (Fig. 3 and 4)
Refer to electric wiring diagram.
If the probe can’t enter the poles because the hole is
too narrow then use a probe with a thinner pin.
Note:
