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RS-485 (P Q) communication wiring configuration
L1+La+Ln≤1200m. Communication wiring 2*0.75mm
N L
Breaker
ODU
1# IDU
Q
Q L
P
P
L1
RS-485 (P Q E) communication wiring configuration
L1+La+Ln≤1200m.
Communication wiring 3*0.75mm
N L
Breaker
ODU
1# IDU
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 resistor of
120 ohms between the P and Q terminals.
Do not bind the communication line,
refrigerant piping and power cable together.
When the power cable and communication
line 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 uniform power supply so that they
can be powered on or off at the same time.
All communication lines of the IDUs and
ODUs must be connected in series, use the
shielded wire, and the shield layer must be
grounded.
2
Distribution box
···
2-(n-2)# IDU
N
La
2
Distribution box
···
2-(n-2)# IDU
E
L
N
La
40
Communication wire
Power wire
Distribution box
(n-1)# IDU
Q L
P
P
N
Ln
Communication wire
Power wire
Distribution box
(n-1)# IDU
P Q
E
L
N
Ln
Main control board
Q
E
P
Shield layer must
be grounded
Connect to the ODU PQE
n# IDU
Q L
N
Resister
Fig 5.55
n# IDU
P Q
E
L
N
Resister
Fig 5.56
Fig 5.57
V.1
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