Gree GMV-784WM/H-X - Communication Line Connection; Communication Cable Selection Guide; Post-Installation Checks; Pre-Operation Inspection Checklist

GMV DC Inverter VRF
48
The connection between the indoor unit and the wired controller is shown as below:
Fig. 3.9.2
(2) Selection of communication line between outdoor unit and indoor unit.
Wire type
Length of
communication
line between
indoor unit and
wired controller(m)
Wire diameter
(mm
2
)
Wire standard Remark
Light / ordinary PVC
sheathed twisted copper
core cord
L
≤
1000
≥
2
×
0.75
IEC 60227-5:2007
If the wire diameter is
increased to 2
×
1mm
2
, the
length of communication line
can't be increased, while the
length of the communication
line can't be more than
1500m.
Shielded light/ordinary PVC
sheathed twisted copper
core cord
L
≤
1000
≥
2
×
0.75
IEC 60227-5:2007
When the installation
environment of the unit is in
strong magnetic or strong
interference, the shielded
wires shall be used.
Fig. 3.9.3
3.9.3 Communication Line Connection
Communication bus connection between indoor unit and outdoor unit must be connected in
series, rather than star connection; the endmost indoor unit of communication bus between indoor
unit and outdoor unit must connect with the communication matching resistor(in the outdoor unit
plastic bag); the fresh air indoor unit is not recommended to be set as the main indoor unit.