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4. SERVICE PROCEDURES
4-1 Trobleshooting
(1) Check before and after Troubleshooting
Many problems may happen because of wiring or power supply problems, so you should
check these areas first. Problems here can cause false results in some of the other tests,
and so should be corrected first.
1 1 1 1 1 . Check power supply wiring
(a) Single-phase
(b) 3-phase
2 2 2 2 2 . Check inter-unit wiring
Single-phase outdoor unit
4
3 3 3 3 3 . Check power supply
If the following troubleshooting must be done with power being supplied,
be careful not to thouch any uninsulated live part that can cause
ELECTRIC SHOCK.
4 4 4 4 4 . Check the lead wires and connectors in indoor and outdoor units.
5 5 5 5 5 Reference
• Condition of general cooling operation (Thermo. ON)
SWEEP..................ON
Indoor fan speed....HIGH
Check that power supply wires are correctly connected to terminal No.
1 through No. 4 on the 4P terminal plate in the indoor unit and L and N
on the 6P terminal in the outdoor unit.
Check that power supply wires are correctly connected to terminal No.
1 through No. 4 on the 4P terminal plate in the indoor unit and L1
through L3 and N on the 8P terminal in the outdoor unit.
Check that inter-unit control wiring (AC 220 - 240 V Line voltage) is
correctly connected between the indoor unit and outdoor unit.
Indoor Unit
Outdoor Unit
B
1
1
2
2
Ground
4
4
L
Inter-Unit
Wiring
N
(Line voltage)
Check that voltage is within the specified range (±10% of the rating).
Check that power is being supplied.
Check that the sheath of lead wires is not damaged.
Check that the lead wires are firmly connected at the terminal plate.
Check that the wiring is correct.
3-phase outdoor unit
Indoor Unit
Power supply
A
L
N
Ground
0611_X_S
42
–
–
Outdoor Unit
B
1
1
2
2
Ground
4
4
A
Inter-Unit
L1
Wiring
L2
(Line voltage)
L3
N
Power supply
L1
L2
L3
N
Ground
0612_X_S
Fig. 16
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