2-27
Design of 2WAY SYSTEM
3. Electrical Wiring
3-3. Wiring System Diagrams
(1) Refer to Section 3-2. “Recommended Wire Length and
Wire Diameter for Power Supply System” for the
explanation of “A”, “B”, “C”, “D”, “E” and “F” 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.
(5) Regarding S-280ME1E5, the power supply 
is 220-240V, 50Hz.
ME1 Type
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
2
1
A
L1
L2
L3
N
2
1
A
L1
L2
L3
N
F
C
L1
L2
L3
N
L1
L2
L3
N
Power supply
220 – 240V  ~50/60Hz
Remote 
controller
Remote 
controller
Remote 
controller
WHT 
BLK
WHT 
BLK
WHT 
BLK
Power supply
220 – 240V  ~50/60Hz
Power supply
220 – 240V  ~50/60Hz
Power supply
220 – 240V  ~50/60Hz
Ground
Ground
Ground
Ground
Ground
Ground
Inter-outdoor-unit control wiring
Ground
Ground
Ground
Outdoor unit 
INV unit
Power supply
380 – 415V, 3 N~, 50Hz
Power supply
380 – 415V, 3 N~, 50Hz
Outdoor unit 
INV unit
Ground
Ground
Ground
Ground
Ground
Ground
Indoor unit 
(No. 1)
Indoor unit 
(No. 2)
Indoor unit 
(No. n)
Indoor unit 
(No. 3)
Group control:
U1
U2
R1
R2
7P terminal board
T1, F1, E1, D1, L1 Types
Power 
supply
Remote 
controller 
line
Unit 
control 
wiring
L
N
LN
LN
U1 U2
U1 U2
R1 R2
6P terminal board
Power 
supply
Unit 
control 
line
Remote 
control 
line
U1, Y1, M1, P1, R1 Types
5P terminal board
Power 
supply
K1 Type 
K2 Type 
Unit
control
line
4P terminal board
2P terminal board × 2
U1 U2 1 2
L1 L2 L3 N
L1 L2 L3 N
4P terminal board
Power supply
(14 hp, 16 hp, 18 hp and 20 hp)
Power supply
(8 hp, 10 hp and 12 hp)
Inter-outdoor unit 
control wiring
Inter-unit 
control wiring
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
L N U1 U2 R1 R2
U2
U1
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
TD831159-042WAYVRF.indb27TD831159-042WAYVRF.indb27 2014/08/2516:51:432014/08/2516:51:43