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”).
Measure insulation
resistance of electrical
parts in outdoor unit.
NO
NO
Set circuit breaker to OFF.
*
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.
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
29
