38
3) AIR CONDITIONER DOES NOT OPERATE
(a) Circuit breaker trips (or fuse blows)
• When circuit breaker is set to ON, it trips in a few moments. (Resetting is not possible).
• Measure insulation resistance there is a possibility of ground fault. If resistance value is 1M
Ω
or less,
insulation is defective.
Circuit
breaker
Outdoor
unit
1
2
z
4
5
Unità
esterna
x
x
3
4
5
6
7
8
Unità
esterna
x x
x x
x x
Indoor
unit
1
2
z
4
5
Ground
Power
supply
Inter-uni
wiring
a b c
d
Circuit
breaker
Outdoor
unit
5 1
6
7
8 2
z
4
Unità
esterna
x
x
x
x
5
6
7
8
Unità
esterna
x x
x x
x x
x x
Indoor
unit
1
2
z
4
Ground
Power
sypply
Inter-unit
wiring
a b c
d
• Set circuit breaker to OFF.
Unità
esterna
L1
L2
L3
N
5
6
7
8
z
z
ADR518CW - AE518SC
ADR518CW- AER/AE518SCL3
➀
Remove power supply wires
from terminal plate in outdoor
unit.
• Measure insulation resistance of
power supply wires.
Do rewiring
Do rewiring.
➁
Remove inter-unit wires from
terminal plate in outdoor unit.
• Measure insulation resistance of
outdoor unit.
Insulation of outdoor
unit is defective.
Measure insulation resi-
stance of electrical parts in
outdoor unit.
Measure insulation resi-
stance of electrical parts in
indoor unit.
Insulation of indoor unit
is defective.
➂
Remove inter-unit wires from
terminal plate in intdoor unit.
• Measure insulation resistance of
intdoor unit.
➃
Measure insulation resistance of
inter-unit wires.
OK
OK
YES
YES