Air Conditioner Does Not Operate - Sanyo C0951 Technical & Service Manual

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").
WARNING
*
Set circuit breaker to OFF.
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.
B. Circuit breaker trips in several minutes after turning the air conditioner on.
There is a possibility of short circuit.
Check capacity of circuit breaker.
• •
Capacity of circuit breaker is
suitable.
Measure resistance of outdoor fan
•
motor winding.
Measure resistance of compressor
•
motor winding.
(Inter-unit)
INDOOR
Power lines
INDOOR UNIT
Terminal
2
1
2
3
Disconnect
switch
(Field supply)
G
Grounding
line
NO
NO
NO
45
OUTDOOR UNIT
Terminal
1
1
Fuse
2
3
1
4
L1
5 Circuit
L2
breaker
6
G
Ground
Insulation of
outdoor unit
is defective.
Measure insulation
•
resistance of electrical
parts in outdoor unit.
Insulation of
indoor unit
is defective.
Measure insulation
•
resistance of electrical
parts in indoor unit.
Replace with suitable
one (larger capacity).