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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 1MΩ 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.
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
Check capacity of circuit breaker.
Capacity of circuit breaker is
suitable.
•
Replace with suitable
one (larger capacity).
•
Measure resistance of compressor
motor winding.
•
Measure resistance of outdoor fan
motor winding.
•
NO
INDOOR
INDOOR UNIT
Terminal
Disconnect
switch
(Field supply)
1
2
3
1
2
3
4
5
6
GG
Grounding
line
(Inter-unit)
Power lines
Terminal
OUTDOOR UNIT
Power supply line
Single-phase, 230/208 V
Fuse
L1
L2
Circuit
breaker
1
Ground
1
2
000-215 SM (1-56) 7/5/00 2:49 PM Page 45