Haier MVAB009MV2AA Service Manual page 26

Signal Wiring Drawing
Outdoor
P Q A B C
Communication wire between indoor & outdoor
without polarity
Indoor 1
(950 CASSETTE)
A B C P Q
Indoor 4
P Q A B C
A B C
Indoor 7
P Q A B C
A B C
Outdoor units are of parallel connection via three lines with polarity. The main unit, central control and all indoor
units
are of parallel connection via two lines without polarity.
There are three ways of connecting the line control and indoor units:
A. One wired control to control multiple units, i.e. 2-9 indoor units, as shown in the above figure, (1-3 indoor units).
The indoor unit 3 is the wire controlled main unit and others are the wired controlled sub units. The remote
control and the main unit (directly connected to the indoor unit of wired control) are connected via three wires
with polarity. Other indoor units and the main unit are connected via three lines with polarity. SW01 on the main
unit of wired control is set to 0 while SW01 on other sub units of wired control are set to 1, 2 and so on in turn.
(Please refer to the code setting A at page 15)
B. One wired control controls one indoor unit, as shown in the above figure (indoor unit 4-8). The indoor units and
the wired control are connected via three lines with polarity.
C. Two wired controls control one indoor unit, as shown in the figure (indoor unit 9). Either of the wired controls can
be set to be the master wired control while the other is set to be the auxiliary wired control. The master wired
control and indoor units, and the master and auxiliary line controls are connected via three lines with polarity.
Note: For DC motor/low ESP duct type, the PCB comes with the terminal blocks. Please be sure to pay attention
to do the wiring according to the labels. The power lines and signal lines go through the metal wire hole
separately with the protective sleeve of the connecting line.
Indoor 2
P Q A B C
Indoor 5
P Q A B C
A B C
Wired controller
Indoor 8
P Q A B C
A B C
Wired controller
Control wire for wired controller with polarity
Indoor 3
P Q A B C
A B C
Indoor 6
P Q A B C
Wired controller
A B C
Indoor 9
P Q A B C
Wired controller
A B C
Wired controller Wired controller
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Wired controller
Wired controller
A B C