Sanyo SAP-K77RAX Air conditioner does not operate, Circuit breaker trips or fuse blows

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.

Turn off the circuit breaker and disconnect the power supply wiring

WARNING

to prevent the electric shock or damage to any measuring instrument.

<Check outdoor unit >

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.

Does the insulation resistance read 2M ohm or more ?

No

1.Insulation of outdoor unit is defective.

2.And measure insulation resistance of electrical parts in outdoor unit to specify the insulation fault.

Power Outdoor

supply unit wiring

Power	Circuit	L		1
supply	breaker	N		2
			3

<Check indoor unit >

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.

Does the insulation resistance read 2M ohm or more ?

No

1.Insulation of indoor unit is defective.

2.And measure insulation resistance of electrical parts in indoor unit to specify the insulation fault.

Indoor

Inter-unit unit wiring

1

2

3

Ground

Fig.1

44