Carrier XCT Series Installation And Owner's Manual page 23

Electrical Wiring
Signal Wiring Drawing
outdoor 1
Indoor 1 (AC)
Indoor 6
Indoor 11
Indoor 16
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 connecting ways between 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 line control controls one indoor unit, as shown in the above figure (indoor unit 6-19). The indoor unit and the
line control are connected via three lines with polarity.
C. Two line controls control one indoor unit, as shown in the figure (indoor unit 20). Either of the line controls can be
set to be the master line control while the other is set to be the auxiliary line control. The master line control and
indoor units, and the master and auxiliary line controls are connected via three lines with polarity.
When the indoor units are controlled by the remote control, switch over the modes by Switching Mode of Line-
Controlled Main Unit/ Line-Controlled Sub Units/ Remote-Controlled Types. The signal terminals needn't to be
outdoor 2
Indoor 2 (AC)
Indoor 7
wired wired
controller controller
Indoor 12
wired wired
controller controller
Indoor 17
wired wired
controller controller
outdoor 3
communication wire with polarity
Indoor 3 (DC) Indoor 4 (DC)
Indoor 8 Indoor 9
wired
controller
Indoor 13 Indoor 14
wired
controller
Indoor 18 Indoor 19
wired
controller
15
control wire for wired controller
with polarity
Indoor 5 (DC)
wired
controller
Indoor 10
wired
controller
Indoor 15
wired
wired
controller
controller
Indoor 20
wired
controller
wired
controller controller
wired
controller
wired