2-3
Design of VRF SYSTEM
1. Electrical Wiring
1-3. Wiring System Diagrams
(1) Refer to Section 1-2. “Recommended Wire Length and
Wire Diameter for Power Supply System” for the
explanation of “B”, “C”, “D” and “E” in the above
diagram.
(2) The basic connection diagram of the indoor unit shows
the 7P terminal board, so the terminal boards in your
equipment may differ from the diagram.
(3) Refrigerant Circuit (R.C.) address should be set before
turning the power on.
(4) Address setting can be executed by remote controller
automatically. Refer to Section 5.
U2
U1
R2
R1
L
N
R2
R1
R2
R1
R2
R1
2
1
2
1
U2
U1
L
N
U2
U1
L
N
U2
U1
L
N
2
1
2
1
2
1
D
E
C
B
L
N
L
N
L
N
L
N
2
1
B
B
B
C
D
D
C
C
Power supply
220/230/240V ~50/60Hz
Remote
controller
Remote
controller
Remote
controller
WHT
BLK
WHT
BLK
WHT
BLK
Power supply
220/230/240V ~50/60Hz
Power supply
220/230/240V ~50/60Hz
Power supply
220/230/240V ~50/60Hz
Ground
Ground
Ground
Ground
Ground
Ground
To outdoor unit
Outdoor unit
Ground
Ground
Ground
Ground
Ground
Indoor unit
(No. 1)
Indoor unit
(No. 2)
Indoor unit
(No. n)
Indoor unit
(No. 3)
Group control:
LN U1U2
5P terminal board
Power
supply
K1 Type
K2 Type
Unit
control
line
L N U1 U2 R1 R2
L
N
U1 U2 R1 R2
6P terminal board
Power
supply
Unit
control
line
Remote
control
line
U1 Type
6P terminal board
F2 Type
Power
supply
Remote
control
line
Unit
control
line
6P terminal board
Power
supply
cable
Inter-unit
control
wiring
Remote
control
wiring
Y2 Type
Terminal Board
Power supply
cable
Inter-unit con-
trol wiring
Inter-unit con-
trol wiring
Fig. 2-1
L N U1 U2 R1 R2
6P terminal board
T2 Type
Power
supply
Remote
control
line
Unit
control
line
TDxxxxxx-002WAYVRF.indb3TDxxxxxx-002WAYVRF.indb3 2014/01/3017:52:302014/01/3017:52:30