– 30 –
SM830079
11. SERVICE PROCEDURES
(1)
Troubleshooting
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
❑
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 No. 5 and No.
6 on the 6P terminal in the outdoor unit.
2
2
2
2
2
Check inter-unit wiring
❑
Check that inter-unit control wiring (AC 230 - 208 V Line voltage) is cor-
rectly connected between the indoor unit and outdoor unit.
3
3
3
3
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 touch 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.
❑
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.
5
5
5
5
5
Reference
•
Condition of general cooling operation (Thermo. ON)
SWEEP .................. ON
Indoor fan speed .... HIGH
1306_M_I
2
1
3
2
1
3
4
5
6
G
G
14 AWG
(Inter-unit)
Power lines
B
230/208 V
230/208 V
230/208 V
INDOOR
OUTDOOR UNIT
INDOOR UNIT
Disconnect
switch
(Field supply)
Grounding
line
Fuse
L1
L2
Power supply line
Single-phase, 230/208 V
14 AWG
A
Single-phase outdoor unit
Fig. 12
