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(1)-2 Check before and after Troubleshooting (GRV250R7, GRV360R7, GRV480R7)
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 . Check power supply wiring
Check that power supply wires are correctly connected to terminal No.5 through No.8 on the 8P terminal plate
in the outdoor unit.
Check the power supply wires are correctly connected between terminal No.1 and 2 on the 3P terminal plate
in the indoor unit and terminal No.1 and 2 on the 8P terminal plate in the outdoor unit.
2 . Check inter-unit wiring
Check that inter-unit control wiring (DC low voltage) is correctly connected between the indoor unit and outdoor
unit.
Power Supply: 50 Hz, 3-phase, 380-400-415 V
Indoor Unit
1
Inter-unit
power wiring
2
(Line voltage)
Inter-unit
U1
control wiring
U2
(Low voltage)
RED
1
1
R1
2
2
R2
WHT
BLK
3
3
R3
D
Remote controller
(Option)
3 . Check power supply
Check that voltage is within the specified range (±10% of the rating).
Check that power is being supplied.
WARNING
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 . 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.
Outdoor Unit
B
1
2
Ground
1
4
2
L1
C
L2
L3
N
R.C. Address on the PCB: 0 (S2, BLK)
0
(0: Factory shipped state)
L1
L2
Power supply
L3
380 - 415 V - 3 N
N
Ground
A
25
50 Hz
0499_M_I
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