Electrical Control Wiring; Indoor And Outdoor Unit Communication Wires Specifi Cation And Attention - Trane MW(C)W509 Installation & Operation Manual

Electrical control wiring

Indoor and outdoor unit communication wires specifi cation and
attention
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Indoor and outdoor unit communication wires are provided by Trane.
STP specifi cation is 0.5
C
Lay L 10cm
D
A: Outer sheath B: Shield layer C: Insulator D: Conductor
Do not connect the power supply wire with the communication wire terminal.
You have to connect control (communication) wire and the total length should be less than
1,000m.
Shield layer of the communication wire and the main unit must be grounded.
Install the communication wire before power on. Do not plug in and out with electricity,
avoiding communication chip damage.
Control signal circuit must use STP , avoiding strong electric signal interference. (Choose
network wire with tight shield layer and small lay.)
Control signal is divided into A and B, two polarities. Different polarities can
not be connected as followings (A can not connect with B):
Control main board
Communication port
A1 B1
It is wrong to connect A with B.
When power supply wire and communication wire are parallel wiring, please cover
conduits and keep a certain distance between them.
The communication wire passes through the side incoming hole and connects controller
CN2 terminals as followings:
RS485 wire sequence
CN2 terminal
2
1.25mm and the lay is less than 10cm.
B A
STP legend
Control main board
Communication port
A1 B1
A B
A B
Shield layer
G
AMS-SVX03A-EN