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Module selection for the communication cable between the indoor unit and wired controller
Material type
Total length of
communication line
between IDU unit and
wired controller L m(feet)
Wire size Remarks
Light/Ordinary
polyvinyl chloride
sheathed cord.
L
≤
250(820-1/5)
2×AWG18~
2×AWG16
1. Total length of communication line can't exceed 250m(820-
1/5feet).
2. The cord shall be Circular cord (the cores shall be twisted
together).
3. If unit is installed in places with intense magnetic eld or strong
interference, it is necessary to use shielded wire.
Graphic of connection between IDU and wired controller
Notes: If the air conditioning units are installed at a place with strong electromagnetic interference, a
shielded cable must be used as the communication cable between the indoor unit and wired controller,
and a shielded twisted pair must be used as the communication cable between the indoor unit and
indoor (outdoor) unit.
11.2.2 Communication Access Mode
The communication bus of GMV5 HR indoor and outdoor units must be connected in series, and star
connection is forbidden. The indoor unit at the end of the communication bus for the indoor units
and outdoor units must be connected to a communication matching resistor (which is contained in the
packing bag of the outdoor unit).
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