Carrier 40VD005L-7E-QEE Manual De Instalación Y Propietario página 22

Electrical Wiring
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, that is, 2–16 indoor units, as shown in the above figure (indoor units 1–5).
Indoor unit 5 is the main unit and others are the subunits. The wired controller and the main unit are connected via three
lines with polarity. Other indoor units and the main unit are connected via two lines with polarity. SW01 on the main unit is
set to 0 while SW01 on other sub units of line control are set to 1, 2, 3, and so on in turn (please refer to the code setting
on page 20).
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.
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