9-2. Air conditioner does not operate.
9-2-1. Circuit breaker trips (or fuse blows).
A. When the circuit breaker is set to ON, it is tripped soon. (Resetting is not possible.)
●
There is a possibility of ground fault.
●
Check insulation resistance.
If resistance value is 2M
Ω
or less, insulation is defective (“NO”).
B. Circuit breaker trips in several minutes after turning the air conditioner on.
●
There is a possibility of short circuit.
Replace with suitable
one (larger capacity).
•
•
•
NO
Check capacity of circuit breaker.
Capacity of circuit breaker is
suitable.
Measure resistance of outdoor fan
motor winding.
Measure resistance of compressor
motor winding.
Measure insulation
resistance of electrical
parts in outdoor unit.
NO
NO
Measure insulation
resistance of electrical
parts in indoor unit.
1
Remove both power supply wires
and inter-unit wires from terminal
plate in outdoor unit.
Measure insulation resistance
of outdoor unit.
•
2
Remove inter-unit wires from
terminal plate in indoor unit.
Measure insulation resistance
of indoor unit.
•
•
•
Insulation of
outdoor unit
is defective.
Insulation of
indoor unit
is defective.
Set circuit breaker to OFF.
*
WARNING
Indoor
unit
2
Outdoor
unit
1
1
Inter–unit
wiring
Power
supply
wiring
Power
supply
Ground
1
1
2
2
3
4
4
5
5
6
6
7
7
8
8
1
2
Circuit
breaker
23
