Airwell VVFA Series Service Manual page 31

Communication wiring figure
P Q
Indoor 1 （AC fan motor) Indoor 2（DC fan motor) Indoor 3
P Q A B C P Q A B C P Q A B C
Indoor 4 Indoor 5 Indoor 6
P Q A B C P Q A B C P Q A B C
The master outdoor and all indoor units are in parallel through 2 non-polar wires.
There are three connecting ways between wired control and indoor units:
A. One wired controller controls multiple units, as shown in the above figure, (1-3 indoor units). The indoor unit 3
is the wired control master unit (directly connected to the indoor unit of wired controller) and others are the wired
control slave units. indoor unit 2 is DC fan motor models, indoor unit 1 is the AC fan motor models. The wired
controller is connected with the master unit and DC fan motor models through three lines with polarity. Other indoor
units and the master unit are connected via two lines with polarity. SW01 on the main unit is set to 0 while SW01 on
other slave units are set to 1, 2, 3 and so on in turn. (Please refer to the dip switch setting)
B. One wired controller controls one indoor unit, as shown in the above figure (indoor unit 4-5). The indoor unit and
the wired controller are connected via three lines with polarity.
C. Two wired controllers control one indoor unit, as shown in the figure (indoor unit 6). Either of the wired controllers
can be set to be the master wired control while the other is set to be the slave wired controller. The master wired
controller, slave wired controller and indoor units are connected via three lines with polarity.
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