Air Conditioner Does Not Operate - Technibel MCAV77R5VAA Technical & Service Manual

8-2. Air conditioner does not operate.

8-2-1. 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 2MΩ or less, insulation is defective ("NO").
Circuit
breaker
*
Set circuit breaker to OFF.
1 Remove 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.
Then, pull the power plug out of
the wall outlet
• Measure insulation resistance
of indoor unit.
Power plug
(Local supply)
2
Wall outlet
(receptacle)
Single phase
Ground
220 –240V ~ 50Hz
WARNING
Indoor
Inter–unit
unit
wiring
2 1
L
N
Ground
1
2
3
4
NO
NO
43
Outdoor
unit
L
N
1
2
3
4
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.