Carrier XCT 7 40VD H-7S Series Installation And Owner's Manual page 24

Electrical Wiring
Supply Wiring Drawing
outdoor 1
indoor 1 (AC)
indoor 6
indoor 11
indoor 16
Outdoor units have parallel connections via three lines with polarity. The main unit, central control, and all indoor units have parallel
connections via two lines without polarity.
There are three connecting ways between the line control and indoor units:
A. One wired controller controls multiple units, i.e. 2-16 indoor units, as shown in the above figure(1-5 indoor units).The indoor unit 5 is
the line-controlled master unit and others are the slave units. The remote controller and the master unit(directly connected to the indoor
unit of wired controller) are connected via three lines with polarity. Other indoor units and master unit are connected via two lines or
three lines with polarity (If the PCB of indoor is DC, the wired controller needs to be connected to ABC, while the PCB of indoor is AC,
the wired controller only connects to BC.). SW01 on the mater unit of line control is set to 0 while SW01 on the slave units of line
control are set to 1,2,3 and so on in turn.(Please refer to the code setting page).
B. One wired controller controls one indoor unit, as shown in the above figure (indoor units 6–19). 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 20). Either of the controllers can be set to be the master
controller while the other is set to be the auxiliary controller. The master wired controller and indoor units, and the master and auxiliary
wired controller are connected via three lines with polarity.
outdoor 2 outdoor 3
indoor 2 (AC) indoor 3 (DC)
indoor 7 indoor 8
wired wired
controller controller
indoor 12 indoor 13
wired
wired
controller
controller
indoor 17 indoor 18
wired
wired
controller
controller
communication wire with polarity
indoor 4 (DC)
indoor 9
wired
controller controller
indoor 14
wired
controller
controller
indoor 19
wired
controller
controller
17
control wire for wired controller
with polarity
indoor 5
wired
controller
indoor 10
wired
wired
controller
indoor 15
wired
wired
controller
indoor 20
wired
wired wired
controller controller