37
Do not connect the communication line when the power is on.
Connect the shielding nets at both ends of the shielded wire to the sheet metal “ ” of the electronic control box.
Do not connect the power cable to the terminal of communication line, otherwise, the motherboard will be damaged.
Do not connect a system with both HyperLink (M1 M2) communication lines and PQ communication lines.
WARNING
On-site wiring must comply with the relevant regulations of the local country/region and must be completed by
professionals.
The communication lines of the IDUs and ODU can only be led out and connected from the ODU.
When a single communication line is not long enough, the joint must be crimped or soldered, and the copper wire at
the joint shall not be exposed.
Applicable standards: EN 55014-1 and EN 55014-2. The communication line must be shielded wire.
CAUTION
Before connecting the communication wiring, please select the appropriate connection method. Refer to the following table:
HyperLink (M1 M2) communication
RS-485 (P Q) communication
Optional communication mode of IDU and ODU
Table 6-3 communication mode
X Y E P Q E M1 M2 O A H1 H2
Controller
PQE
IDU Comm.
HyperLink
IDU Comm.
Digital
Power Meter
Communication terminal
Figure 6-5
6.3 Connecting the Communication
Wiring
Communication mode
Type of wire
Number of cores and
wire diameter (mm
2
)
Total length of
communication line (m)
HyperLink (M1 M2) communication
PVC-sheathed
copper-core flexible
shielded twisted pair
PVC-sheathed
copper-core flexible
shielded twisted pair
2х0.75
2х0.75
L≤1200
L≤2000
RS-485 (P Q) communication
Table 6-4 Communication wiring material
The communication line must
conform to the safety extra-low
voltage (SELV).
NOTE
▪ For a single-phase system, the EMI effect of the
communication line M1M2 (or PQE) can be
improved by adding a magnetic ring. The
installation is shown in the figure below. The
magnetic ring needs to be fixed with the
communication line (it can be wound for one or
more turns), and placed in the machine to prevent
it from falling off.
P Q E M1M2
▪ Wiring layout is comprised of the communication wiring
between the indoor and outdoor units. These include
the earth lines, and the shielded layer of the earth lines
of the indoor units in the communication line. See
below the wiring layout of outdoor unit.
Figure 6-4
