Carrier X-POWER Series - Page 130

R410a DC Inverter 60Hz Carrier service manual
148 Installation
7.3.2 Example connection of wiring
(P Q E)
(H1 H2 E) (H1 H2 E) (H1 H2 E)
(H1 H2 E)
(P Q E)
Signal wire between outdoor units
To closed end of shield wire
(open)
group control
The indoor unit at the terminal of communication system should
parallel connect a resisitor between port P and port Q.
P
Q
matching
resisitor
Outdoor unit
(master unit)
Outdoor unit
(slave unit)
Outdoor unit
(slave unit)
Outdoor unit
(slave unit)
Signal wire between
indoor and outdoor units
All shield terminals of shield wires
should connect to COMM terminal