Sanyo KH2442 / CH2442 Checking the Electrical Components, Measurement of Insulation, Resistance

			4. Service procedures
4-2	Checking the Electrical Components		Earthed wire
(1)	Measurement of Insulation		Clip
	Resistance
• The electrical insulation is acceptable when the		Probe
resistance exceeds 1 MΩ.			Insulation
				Fig. IV-14
			tester

0638_X_S

1Power Supply Wires

Clamp the earthed wire of the Power Supply wires with a lead clip of the insulation resistance tester and measure the resistance by placing a probe on either of the power wires. (Fig. IV-14)

Then measure the resistance between the earthed wire and the other power wires. (Fig. IV-14)

2Indoor 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. IV-15)

Terminal plate

Probe

Clip

4

3Outdoor Unit

Measure the resistance by placing a probe on the terminal plate in the same manner as explained above 2. (Fig. IV-15)

4Measurement 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)

•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.

Copper	Insulation
tube or	tester
metallic part

0639_X_S

Probe

Clip

Copper tube or metallic part

Insulation tester

0640_X_S

From fan motor, compressor and other parts.

Metallic	Probe
part
Clip

Insulation tester

0641_X_S

Fig. IV-15

Fig. IV-16

Fig. IV-17

SM830082

IV - 30