– 23 –
Installation Manual
Specifications for communication wiring
Design of communication wiring
Summary of communication wiring
Communication wiring and central control wiring use 2-core non-polarity wires.
Use 2-core shield wires to prevent noise trouble.
In this case, for the system grounding, close (connect) the end of shield wires, and isolate the end of terminal.
Use 2-core non-polarity wire for remote controller. (A, B terminals)
Use 2-core non-polarity wire for wiring of group control. (A, B terminals)
U1 U2 U3 U4
U1 U2
U3 U4
U1 U2 A B
2
U
B
A
U1
U2
U1
A
2
U
B
U1
A B
B
A
B
A
B
A
Outdoor unit
Central controller
Communication wiring between indoor and outdoor units
(Shield wire)
Communication wiring between indoor units (Shield wire)
Indoor unit
Indoor unit
Indoor unit
Indoor unit
Remote controller
Remote controller
Remote controller
(Group control)
Keep the rule of below tables about size and length of communication wiring.
Table-1
Control wiring between indoor and outdoor units (L1, L2, L3), Central control wiring (L4)
*1 Total of control wiring length for all refrigerant circuits ( L1 + L2 + L3 + L4 )
Table-2
Control wiring between outdoor units (L5) (Other system)
Table-3
Remote controller wiring (L6, L7)
Wiring
2-core, non-polarity
Type
Shield wire
Size / Length *1
1.25 mm
2
: Up to 1000 m
2.0 mm
2
: Up to 2000 m
Wiring
2-core, non-polarity
Type
Shield wire
Size / Length
1.25 mm
2
to 2.0 mm
2
Up to 100 m (L5)
Wiring
2-core
Size
0.5 mm
2
to 2.0 mm
2
Length
• Up to 500 m (L6 + L7)
• Up to 400 m with of wireless remote controller in group control.
• Up to 200 m total length of control wiring between indoor units ( L6 )
U3 U4
U1 U2
U1
U3
U2
U4
U1 U2
A B
U3 U4
U1 U2
U1 U2
A B
U1 U2
A B
U1 U2
A B
U1 U2
A B
U1 U2
A B
U3 U4
U1 U2 U5 U6
U1 U2
A B
U1 U2
A B
U1 U2
A B
U3 U4
U1 U2 U5 U6
L1
L5
L6
L6
L7
L7
L4
3
L
2
L
Central
controller
This system
Other system
Table-1
Header
unit
Follower
unit
Table-1
Table-2
Table-3
Outdoor unit
Indoor unit
Remote controller
Remote controller
Remote controller
EN-45
EN-46
1FAN_IM_DHV0100301-00_EN.book Page 23 Saturday, November 4, 2017 2:39 PM
