11
Control wiring
(C) Inter-Unit Control Wiring
(D) Remote Control Wiring
(E) Control Wiring for Group Control
0.75 mm
2
(AWG#18)
0.75 mm
2
(AWG#18)
0.75 mm
2
(AWG#18)
Use Shielded Wiring
Max. 1000 m
Max. 500 m
Max. 500 m
NOTE
1) Refer to the Wiring System Diagrams (See next page) for
the meaning of “A”, “B”, “C”, “D”, “E” in the above tables.
2) Inter-Unit Control Wiring (c) has no polarity.
But for other wiring, respect polarity.
Be sure to connect as shown in the Wiring System Diagram.
3) The basic connection diagram of the indoor unit shows the
8P terminal board, so the terminal boards in your equipment
may differ from the diagram.
4) In accordance with conformity of EC Directive No.
89/336/EEC, when connecting power supply, it should be
considered guidance showing below.
* Do not share a common installation group with other
equipment.
* Be sure that supply network impedance is sufficiently low
(
Z
SYS
R
Ω
). It may be necessary to consult the power
supply authority before connection of the air conditioner
to a low-voltage public network.
Models
R
W
Remarks
GRV 250 (3 phase)
-
Not necessary to consider supply network impedance
GRV 360 (3 phase)
0.192
Conforms to the loal code
GRV 480 (3 phase)
0.167
Ditto
GRV 250 (1 phase)
0.126
Ditto
6-3 Wiring System Diagrams
twin type (two indoor units)
1
2
U1
U2
R1
R2
R3
1
2
3
1
2
3
1
2
4
L1
L2
L3
N
C
D
A
1
2
U1
U2
R1
R2
R3
0501_M_I
L1
L2
L3
N
L
F
F
N
L
N
1
2
0
C
E
≥
7P terminal board
1(L)2(N)
Power
Supply
R1 R2 R3
Remote
Controller
U1 U2
Inter-unit
control wiring
Power supply
220 - 240 V
~
50 Hz
RED
WHT
BLK
Remote controller
(option)
Inter-unit
control wiring
(Low voltage)
Ground
Indoor Unit
Outdoor Unit
R.C. address on the PCB: 0 (S2, BLK)
0: Factory shipped state
Power supply
380 - 415 V - 3 N
~
50 Hz
Inter-unit
control wiring
(Low voltage)
Power supply
220 - 240 V
~
50 Hz
Ground
Ground
Ground
Indoor Unit
EG