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RS-485 (P Q) communication wiring configuration
L1+L2≤1200m. Communication wiring 2*0.75mm
Breaker
ODU
Q
P
P
L1
RS-485 (P Q E) communication wiring configuration
L1+L2≤1200m.
Communication wiring 3*0.75mm
Breaker
ODU
P Q
E
P Q
L1
CAUTION
After the last indoor unit, the communication
wiring should not route back to the outdoor
unit as this will form a closed loop.
In the last indoor unit, connect a resistance
of 120 ohms between the P and Q terminals.
Do not bind the communication wiring,
refrigerant piping and power cable together.
When the power cable and communication
wiring are laid in parallel, the distance
between the two lines must be 5cm or more
to prevent signal source interference.
All IDUs in a system must be powered
through a unified power supply so that they
can be powered on or off at the same time.
All communication wiring of the IDUs and
ODUs must be connected in series, use the
shielded wire, and the shield layer must be
earthed.
2
N L
Distribution box
1# IDU
Q L
N
L2
2
N L
Distribution box
1# IDU
E
L
N
L2
Distribution box
2# IDU
Q L
P
N
Distribution box
2# IDU
P Q
E
L
N
Main control board
Q
E
P
Connect to the ODU PQE
Communication wiring
Power supply cable
Fig 5.47
Communication wiring
Power wire
Fig 5.48
Shield layer must
be earthed
Fig 5.49
V.1
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