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SM830092
12. SERVICE PROCEDURES
(3) Checking the Electrical Components
1) Measurement of Insulation
Resistance
•
The electrical insulation is acceptable
when the resistance exceeds 2 MΩ.
1
Power Supply Wires
Clamp the earthed wire of the Power
Supply wires with a lead clip of the
insulation resistance tester and mea-
sure the resistance by placing a probe
on either of the power wires. (Fig. 16)
Then measure the resistance between
the earthed wire and the other power
wires. (Fig. 16)
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 the
terminal plate (Fig. 17)
3
Outdoor Unit
Measure the resistance by placing a
probe on the terminal plate in the same
manner as explained above 2 . (Fig. 17)
4
Measurement of Insulation Re-
sistance for Electrical parts
• Disconnect the connector of the
desired electric part from terminal
plate, P.C.B. Ass’y, etc. (Fig. 18)
•
Similarly, disconnect the lead wires from
compressor, capacitor, etc. (Fig. 19)
• Measure the resistance in the same
manner as illustrated on the right.
Refer to Electrical Wiring Diagram.
If the probe does not enter the hole
because the hole is too narrow, use a
probe with a thinner pin.
Earthed wire
Clip
Probe
Insulation
tester
0638_X_S
Fig. 16
Copper
tube or
metallic part
Clip
Insulation
tester
Probe
Terminal plate
0639_X_S
Fig. 17
Copper
tube or
metallic part
Clip
Insulation
tester
Probe
0640_X_S
Fig. 18
From fan motor,
compressor and other
parts.
Clip
Probe
Insulation
tester
Metallic
part
0641_X_S
Fig. 19
NOTE