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16.2 Communication Wiring
▪ The PQE electromagnetic interference of
communication wires can be mitigated by using
more magnetic rings. For installation, see the
following figure. Magnetic rings shall be fixed with
communication wires (wrapping in one or more
rounds) and placed inside the unit to prevent
falling.
Caution
Figure 16-2
P Q E
▪ The wiring layout consists of connection cables be-
tween ODUs and IDUs (including VRF IDUs, DHW
kits and hydraulic modules). It includes the IDU
grounding wire and shielding layer in the commu-
nication wiring. The ODU Wiring Diagram is shown
below.
Figure 16-3
Communication
of IDUs
Centralized
controller
O A
E
X
Y P
Q
E
Digital
multimeter
■ This device contains a grounding connection that is
for functional purposes only.
Communication wires must
conform to safety extra low
voltage (SELV) standards.
● Do not connect communication wires when the power is on.
● Connect the shielding nets at both ends of the shielded cable to the sheet metal " " of the electrical control box.
Caution
● On-site wiring must comply with the relevant regulations of the local country/region and must be completed by
professionals.
● Communication wires between IDUs (including multiple IDUs, DHW kits and hydraulic modules) and ODUs shall only
be led out from ODUs.
● When a single communication wire is not long enough for connection, the joint must be crimped or soldered, and the
connected copper wire at the joint shall not be exposed.
● When connecting a power supply cable with a signal cable in parallel, ensure that they are enclosed respectively in
their conduits.
● Applicable standards: EN 55014-1 and EN 55014-2. Communication wires must be shielded.
● Do not connect the power cable to the terminal of a communication wire; otherwise, the motherboard will become
damaged.
Caution
Select a proper method before connecting communication wires. Refer to the following table:
Table 16-3 PQE Communication Mode
Combination
ODU model
Wire type
Number of cores and
wire diameter (mm²)
Total length of
communication wire (m)
ODU + IDU
8/10/12/14/16 kW
PVC sheathed copper-core
flexible shielded twisted pair
3×0.75
L≤1200
ODU + IDU + DHW
kit
12 kW
PVC sheathed copper-core
flexible shielded twisted pair
3×0.75
L≤1200
ODU + IDU +
hydraulic module
8/10/12/14/16 kW
PVC sheathed copper-core
flexible shielded twisted pair
3×0.75
L≤1200
ODU + hydraulic
module
8/10/12/14/16 kW
PVC sheathed copper-core
flexible shielded twisted pair
3×0.75
L≤1200
Summary of Contents for KMF-80 DVR5
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