28
L
CHECKING ELECTRICAL COMPONENTS
1) Measurement of Insulation Resistance
●
The insulation is in good condition if the resi-
stance exceeds 1M
.
NOTE
Power Supply Wires
Clamp the earthed wire of the power supply wires
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 earthed
wire and the other power wires (Fig. 1).
a)
Indoor unit
Clamp an aluminium plate fin or copper tube with
the lead clip of the insulation resistance tester and
measure the resistance by placing a probe on N
terminal, and then on L terminal the terminal plate
(Fig. 2).
b)
Measurement of Insulation Resistance for
Electrical Parts
Disconnect the lead wires of the disired electric
part from terminal plate, PCB Ass’y, capacitor, etc.
Similarly disconnect the connector. Then measure
the insuration resistance. (Fig. 1 to 4).
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.
c)
EATHER LINE
TERMINAL PLATE
PROBE
PROBE
PROBE
PROBE
INSULATION
TESTER
INSULATION
TESTER
INSULATION
TESTER
Fig. 1
Fig. 2
Fig. 3
Fig. 4
CLIP
CLIP
CLIP
METALLIC
PART
FROM FAN MOTOR, COMPRESSOR
AND OTHER PARTS
CLIP
COPPER
TUBE OR
METALLIC PART
COPPER
TUBE OR
METALLIC PART
