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◆ Reuse Existing Communication Wiring Flowchart
START
Is the communication wiring condition out of damage,
crack, deteriorate, etc?
Can the communication wiring be reused safely?
(Check whether the communication wiring line and
ground is connected or not)
YES
Did the outdoor unit with the exisiting communication
wiring before update operate normally without any
abnormalites, malfunction, failure, etc in the past 1 year
related to communication line?
YES
Did the outdoor unit with existing communication wiring
before update operate normally without having any
noise from other devices such as TV and Radio?
YES
Is the communication wiring and another wiring (power
supply wiring, ground wiring, etc) separated at least
50 mm or more without bundling each other?
YES
Does the exisiting communication wiring meet the
wiring type, size and length specifications of the
updated outdoor unit? Please confirm the specification
by refer to table below and wiring diagram.
Connecting wiring between
indoor and outdoor units (Uv Line)
Central Controller Wiring (Uh Line)
Connecting wiring between
outdoors units (Uc Line)※1
Wiring
2-core, Non-Polarity
Wiring
2-core, Non-Polarity
Type
Shield Wire
Type
Shield Wire
Size/Length
1.0 to 1.5 mm
2
: up to
Size/Length
1.0 to 1.5 mm
1000 m
1000 m
2.0 mm
2000 m
Please use the wire size as desribed in
~
mm
within that range. Other than that, use the smallest size.
2
•
Connecting wiring length is total length of connecting wiring length between outdoor units and connecting wiring length between
※1
indoor and outdoor units (The length is for the same refrigerant line. Each refrigerant line is independent for each other)
YES
Able to reuse exisiting
communication wiring
NO
Are the abnormalities,
Unable to reuse the
NO
malfunction, failure, etc related
NO
exisiting communication
to communication line properly
wiring.
repaired?
YES
Are the noise from other devices
Please change or renew
NO
NO
such as TV and Radio properly
the communication
repaired?
wiring.
YES
Is it possible to separated the
NO
NO
communication wiring and another
wiring by 50 mm or more?
※Do not use wiring that
has crack, damage,
YES
deteriorate, etc as it may
cause electric shortage,
NO
fire and malfunction.
Remote Controller Wiring
Wiring
2-core, Non-Polarity
Size/Length
0.5 to 2.0 mm
2
•
2
: up to
Length
Up to 500 m
•
Up to 400 m in case two remote
2
: up to
controller in group control
•
Up to 200 m total length of
communication wiring between
indoor units
Note when reusing exisiting communication wiring
1. For communication wiring, please use vinyl cord or 2-core non polarity
wire.
When using multi-core wire with 3 or more cores, use only 2 cores,
bundle the other separetely and earthed only the one side as like the
shield wire
2 When using shied wire, earthed only the one side of the wire on the
outdoor unit.
3 Do not use wire smaller than 0.5 mm
or larger than 2.0 mm
2
Do not use wire that has crack, damage, deteriorate, etc as it may
cause electric shortage, fire and malfunction etc
– 27 –
Wiring Diagram
Please refer to diagram below when connecting the communication wiring.
Central control
device
Uh
U3 U4
U1 U2
n I
d
o
r o
u
n
t i
Remote controller
Note:
• Communication wiring and central control wiring use 2-core non-polarity wires.
Use 2-core shield wires to prevent noise trouble. In this case, ends of the communication wire must be grounded.
• Use 2-core non-polarity wire for remote control. (A, B terminals)
Use 2-core non-polarity wire for wiring of group control. (A, B terminals)
.
2
Header outdoor
Follower outdoor
Uv Uv Uh Uh
Uc Uc
Uv Uv Uh Uh
Uc Uc
SHIELD
SHIELD
SHIELD
SHIELD
Control wiring between outdoor units (Shield wire)
Control wiring between indoor and outdoor units (Shield wire)
Control wiring between indoor units (Shield wire)
A B
A B
U1 U2
Uv
Uv
Indoor unit
n I
d
o
r o
u
n
t i
A B
A B
Remote controller
A B
A B
U1 U2
U
v
U
v
Uv
Indoor unit
A B
Remote controller
(Group control)
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