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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.)
< Failure Cause >
There is a possibility of ground fault.
There is a possibility of insulation fault.
< Identification Method of the Failure Cause >
Identify the failure cause using the following procedure.
WARNING
< Check outdoor unit >
1. Turn off the circuit breaker and disconnect the
power supply wiring.
2. Disconnect the inter-unit wiring from the outdoor
unit terminal plate.
3. Measure insulation resistance of outdoor unit.
Does the insulation resistance read 2M ohm or more ?
1. Insulation of outdoor unit is defective.
2. And measure insulation resistance of electrical
parts in outdoor unit to specify the insulation fault.
Power
supply
Turn off the circuit breaker and disconnect the power supply wiring
to prevent the electric shock or damage to any measuring instrument.
No
Power
supply
wiring
Circuit
breaker
Ground
< Check indoor unit >
1. Turn off the circuit breaker and disconnect the
Fig. 1
power supply wiring.
2. Disconnect the inter-unit wiring from the indoor
Fig. 1
unit terminal plate.
3. Measure insulation resistance of indoor unit.
Does the insulation resistance read 2M ohm or more ?
1. Insulation of indoor unit is defective.
2. And measure insulation resistance of electrical
parts in indoor unit to specify the insulation fault.
Outdoor
unit
Inter-unit
wiring
L
1
N
2
3
Fig.1
44
No
Indoor
unit
1
2
3
Fig. 1
Fig. 1
- Quick Links:
- Unit Specifications
- Room Temperature Control
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