48
System: The maximum total length of the P/Q communication cable of the Indoor unit and outdoor unit
can be up to 1200m, and can be connected in serial, as shown in the figure below:
L1+La+Ln ≤ 1200m
P
Q
CN22
L
N
CN1
L
N
CN1
L1
La
L
N
CN1
Ln
××
××
P
Q
CN6
P
Q
CN6
P
Q
CN6
R
Master
outdoor unit
Distribution box
Indoor unit (n-1)#
···
2-(n-2)# Indoor unit
Indoor unit 1#
Circuit breaker
Power supply cable
Communication wires
Indoor unit n#
Distribution box
Use shielded cables and earth the shield layer.
Power supply for indoor unit
D
P/Q/E communication
If some of the indoor units in the same refrigerant system are non-V8 series, it is required to connect
"P", "Q", and "E" for P/Q/E communication.
Single unit: Use a shielded cable for the P/Q/E communication and properly earth the shield layer. P,
Q, and E ports are located at terminal block "CN6" of the main control board. There is no
distinction between negative and positive electrodes. Connect the shield layer to the sheet
metal of the electric control box, as shown in the following figure:
CN6
P Q E
Electric control box sheet metal part
Main control board
Connect to the outdoor unit PQE
System: The maximum total length of the P/Q/E communication cable of the indoor unit and outdoor
unit can be up to 1200m, and can be connected in serial, as shown in the figure below:
L1+La+Ln ≤ 1200m
P Q
CN22
L
N
CN1
L
N
CN1
L1
La
L
N
CN1
Ln
××
××
P Q
CN6
E
E
P Q
CN6
E
P Q
CN6
E
R
Master
outdoor unit
Indoor unit 1#
Indoor unit (n-1)#
···
2-(n-2)# Indoor unit
Circuit breaker
Power supply for indoor unit
Power supply cable
Communication wires
Indoor unit n#
Distribution box
Distribution box
Use shielded cables and earth the shield layer.
