Carrier 38VT 188CTST Series - Page 26

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EN
Specifications for communication wiring
Design of communication wiring
Summary of communication wiring
A
B
A
B
A
B
A
B
A
B
U3 U4
Uh
U1 U2
Uv
A
B
U1 U2
Uv
A
B
U1 U2
Uv
SHIELD SHIELD Uc Uc
vUvU
Uv
Uv Uh Uh SHIELD SHIELD Uc Uc
U
v
Uv Uh Uh
Header outdoor
Central control
device
Control wiring between outdoor units (Shield wire)
Control wiring between indoor and outdoor units (Shield wire)
Control wiring between indoor units (Shield wire)
tinu roodnItinu roodnI Indoor unit
Remote controller Remote controller Remote controller
(Group control)
Indoor unit
Follower outdoor
 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)