Gree GMVVQ224WM/C-X - Page 51

GMV Heat Recovery DC Inverter VRF
47
communication line between indoor units (between indoor unit and outdoor unit) must use the shielded
twisted pairs.
(1) Selection of communication line between indoor unit and wired controller.
Wire type
Total length of
communication wire
between indoor unit
and wired controller
L(m)
Wire diameter
(mm2)
Wire standard Remark
Light / ordinary PVC
sheathed twisted copper
core cord
L≤250
2
×
0.75~2
×
1.25
IEC 60227-5:2007
The length of
communication line can’t
exceed 250m.
Shielded light/ordinary
PVC sheathed twisted
copper core cord
L≤250
2
×
0.75~2
×
1.25
IEC 60227-5:2007
When the installation
environment of the unit is in
strong magnetic or strong
interference, the shielded
wires shall be used.
The connection between the indoor unit and the wired controller is shown as below:
Fig.3.9.2
(2) Selection of communication wire between outdoor unit and mode exchange box, among
mode exchange boxes, and mode exchange box and indoor unit respectively
Wire type
Length of
communication
wire between
indoor unit and
another
indoor/outdoor
unit(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.