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Keep the rule of below tables about size and length of communication wiring.
Central controller device
Uh
L1
Outdoor unit
Uh
Uh
Uv
Uv
Indoor
L3
L2
unit
Uv
Uv
Uv
A B
A B
L4
Remote
controller
L7
Shut-off Valve unit
Leak Detector wiring (L7) is length from
Leak Detector
header indoor unit (DN[14]=1).
Table-1
Uv line (L2+L3)
Wiring
2-core, non-polarity
Type
Shield wire
2
Size / Length *1
1.0 to 1.5 mm
: Up to 1000 m
*For communication wiring specification for other system, refer to the Installation Manual attached to the outdoor unit to be connected.
Table-2
Uh line (L1)
Wiring
2-core, non-polarity
Type
Shield wire
2
1.0 to 1.5 mm
: Up to 1000 m
Size / Length
2
2.0 mm
: Up to 2000 m
Table-3
Remote controller wiring, Shut-off Valve unit wiring, Leak Detector wiring
Wire
2-core
Size
0.5 mm
2
to 2.0 mm
• Up to 300 m (L4+L5+L6+L7)
• Up to 400 m in case of wireless remote controller in group control.
• Up to 200 m total length of communication wiring between indoor
Length
units and Shut-off Valve unit. (L5+6)
• Up to 300 m. (L4)
• Up to 100 m. (L7)
*For Remote controller wiring, refer to the Installation Manual attached to the Remote controller to be connected.
• U (v, h, c) line means of control wiring.
• Uv line: Between indoor and outdoor units.
• Uh line: Central control line.
• Uc line: Between outdoor and outdoor units.
* For communication wiring specification for Shut-off Valve unit and Leak Detector, refer to the Installation Manual attached to each equipment.
71-EN
Other system
Uh
Uh
Uv
Uc
Uv
Uv
Uv
Uv
A
B
A B
A B
A B
L5
L6
2
◆Group control through a remote controller
Group control of multiple indoor units (8 or 9 units) through a single remote controller
For the group connections without Shut-off Valve units:
It is up to 9 units.
Max. number of connectable Leak Detector and Remote Controller is up to 2 units
Indoor unit
Uc
Remote controller
Uv
For the group connections with a Shut-off Valve unit:
A B
It is up to 8 units.
Max. number of connectable Leak Detector and Remote Controller is up to 2 units
Indoor unit
Leak
Detector
Shut-off Valve unit
Connection of power wires and communication wires
Remove knockouts on the piping / wiring panel on the front of the unit or the panel on the bottom to get the power
and communication wires through the holes. After punching out the knockout hole, remove burrs from the hole and
then install guard materials around the passage hole to protect wires and pipes.
NOTE
Separate the power wire and communication wires.
– 36 –
No.1
No.2
No.3
No.4
A
B
A
B
A
B
A
B
(A.B)
No.1
No.2
No.3
No.4
A
B
A
B
A
B
A
B
(A.B)
Remote
controller
Knockout for the pipes
Protective bush
(Locally procured)
Knockout for the power supply wiring
Knockout for the control wiring between
indoor and outdoor units
No.8
No.9
A
B
A
B
No.7
No.8
A
B
A
B
EN
72-EN
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