11. CHECKING ELECTRICAL COMPONENTS

11-1. Measurement of Insulation Resistance

Ground wire

Clip

The insulation is in good condition if the resistance exceeds 1M ohm.

Probe

11-1-1. Power Supply Cord

Clamp the grounding wire of power cord 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)

Insulation tester

Fig. 1

Terminal plate

Probe

11-1-2. 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.

11-1-3. 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)

11-1-4. 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. (Figs. 3 and 4)

NOTE

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.

Clip

Copper tube or metallic part

Clip

Copper tube or metallic part

Metallic part

Clip

Insulation tester

Fig. 2

Probe

Insulation tester

Fig. 3

From fan motor, compressor and other parts

Probe

Fig. 4

Insulation

tester

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Sanyo CL1872, C2472, C1872, CL2472 service manual Checking Electrical Components, Measurement of Insulation Resistance
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CL1872, CL2472, C1872, C2472 specifications

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