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SM830043
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4
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.
11
11
1. Check power supply wiring
(a) Single-phase
❑ 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.
(b) 3-phase
❑ 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.
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22
2. Check inter-unit wiring
❑ Check that inter-unit control wiring (AC 220 - 240 V Line voltage) is
correctly connected between the indoor unit and outdoor unit.
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33
3. Check power supply
❑ Check that voltage is within the specified range (±10% of the rating).
❑ Check that power is being supplied.
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.
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44
4. Check the lead wires and connectors in indoor and outdoor units.
❑ 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.
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55
5 Reference
• Condition of general cooling operation (Thermo. ON)
SWEEP..................ON
Indoor fan speed....HIGH
Single-phase outdoor unit
3-phase outdoor unit
1
2
4
1
2
4
L
N
Indoor Unit Outdoor Unit
Ground
Ground
B
A
0611_X_S
L
N
Power supply
Inter-Unit
Wiring
(Line voltage)
Fig. 16
1
2
4
1
2
4
L1
N
Indoor Unit Outdoor Unit
Power supply
Inter-Unit
Wiring
(Line voltage)
Ground
Ground
B
A
0612_X_S
L1
L2
L2
L3
L3
N