Haier MRV 5-RC VP1-112B Service Manual page 95

Communication wiring figure (Wired)
Note:
• Outdoor units are in parallel through 3 polar wires. The outdoor and all VP (cooling and heating switching device)
and all indoor units are in parallel through 2 non-polar wires.
• Each VP can be connected to 1~8 indoor units. For the wiring, please refer to the above picture: VP1 is
connected to Indoor 1~3, and the capacity of all the indoor units can not be more than the VP's. Indoor units
which are not connected to VP just have cooling operation, and the wiring can be referred to Indoor 16~20 on the
above picture.
• The communication line must be hand-in-hand serial connection, not using star connection.
• When the length of the single line of communication is not sufficient, the joint connection must be pressed or
solder.
• There are three connecting ways between wired control and indoor units:
A. One wired controller controls multiple units, as shown in the above figure, (1-5 indoor units). The indoor unit 5
is the wired control master unit (directly connected to the indoor unit of wired controller) and others are the wired
control slave units. 3 and 4 indoor units are DC fan motor models, 1 and 2 indoor units are 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)
Communication wire
with polarity
92
control wire for wired
controller with polarity