Checking The Electrical Components; Measurement Of Insulation Resistance - Sanyo KH2442 / CH2442 Service Manual

4-2 Checking the Electrical Components

(1) Measurement of Insulation
Resistance
• The electrical insulation is acceptable when the
resistance exceeds 1 M .
1 1 1 1 1
Power Supply Wires
Clamp the earthed wire of the Power Supply wires
Section
with a lead clip of the insulation resistance tester and
measure the resistance by placing a probe on either
1
of the power wires. (Fig. IV-14)
Then measure the resistance between the earthed
wire and the other power wires. (Fig. IV-14)
2 2 2 2 2
Indoor Unit
Clamp an aluminum plate fin or copper tube with the
2
lead clip of the insulation resistance tester and
measure the resistance by placing a probe on the
terminal plate (Fig. IV-15)
3 3 3 3 3
Outdoor Unit
Measure the resistance by placing a probe on the
terminal plate in the same manner as explained
3
above 2. (Fig. IV-15)
4 4 4 4 4
Measurement of Insulation Resistance for
Electrical parts
• Disconnect the connector of the desired electric part
from terminal plate, P.C.B. Ass'y, etc. (Fig. IV-16)
4
• Similarly, disconnect the lead wires from
compressor, capacitor, etc. (Fig. IV-17)
• Measure the resistance in the same manner as
illustrated on the right.
Refer to Electrical Wiring Diagram.
NOTE
If the probe does not enter the hole because the
hole is too narrow, use a probe with a thinner pin.
Clip
Probe
Terminal plate
Clip
Copper
tube or
metallic part
Clip
Copper
tube or
metallic part
Probe
Metallic
part
Clip
IV - 30
4. Service procedures
Earthed wire
Insulation
Fig. IV-14
tester
0638_X_S
Probe
Insulation
tester
Fig. IV-15
0639_X_S
Probe
Insulation
Fig. IV-16
tester
0640_X_S
From fan motor,
compressor and other
parts.
Insulation
tester
Fig. IV-17
0641_X_S
SM830082