9-2. Air conditioner does not operate.
9-2-1. Circuit breaker trips (or fuse blows).
(1) When the circuit breaker is set to ON, it is tripped soon. (Resetting is not possible.)
11
2
L
2N
33
Outdoor
unit
Indoor
unit
Power
supply
wiring
Inter-unit
wiring
Circuit
breaker
Power
supply
Ground
No
1. Turn off the circuit breaker and disconnect the
power supply wiring. Fig. 1
2. Disconnect the inter-unit wiring from the outdoor
unit terminal plate. Fig. 1
3. Measure insulation resistance of outdoor unit.
1. Insulation of outdoor unit is defective.
2. And measure insulation resistance of electrical
parts in outdoor unit to specify the insulation fault.
Does the insulation resistance read 2M ohm or more ?
There is a possibility of ground fault.
There is a possibility of insulation fault.
< Failure Cause >
< Identification Method of the Failure Cause >
< Check outdoor unit >
Fig.1
No
1. Turn off the circuit breaker and disconnect the
power supply wiring. Fig. 1
2. Disconnect the inter-unit wiring from the indoor
unit terminal plate. Fig. 1
3. Measure insulation resistance of indoor unit.
1. Insulation of indoor unit is defective.
2. And measure insulation resistance of electrical
parts in indoor unit to specify the insulation fault.
Does the insulation resistance read 2M ohm or more ?
< Check indoor unit >
Identify the failure cause using the following procedure.
Turn off the circuit breaker and disconnect the power supply wiring
to prevent the electric shock or damage to any measuring instrument.
WARNING
55
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