Gree GMV-V72W/A-F Owner's Manual page 35

Ultra Heat GMV Multi VRF
(6) Communication between different refrigeration systems.
(7) Graphics of general communication connection.
4.7.2 Communication mode of Ultra Heat GMV Multi VRF Units
CAN bus is taken for communication between IDU and ODU and communication among IDUS.
4.7.3 Selection and connection mode of Ultra Heat GMV Multi VRF communication material
4.7.3.1 Select communication material
NOTICE! If air conditioners are installed at places where there's strong electromagnetic
interference, the communication wire of IDU and wired controller must use shielded wire and the
communication wire between IDU and IDU/ODU must use shielded twisted pair.
(1)Select communication wire between IDU and wired controller
Material type line between IDU unit and wired
Light/Ordinary
polyvinyl chloride
sheathed cord.
Total length of communication
controller L m(feet)
L≤250(820-1/5)
Fig.34
Wire size
1. Total length of communication line can't
exceed 250m (820-1/5feet).
2. The cord shall be Circular cord (the
2×AWG18~
cores shall be twisted together).
2×AWG16
3. If unit is installed in places with intense
magnetic field or strong interference, it is
necessary to use shielded wire.
31
Remarks