Carrier X-POWER Series Service Manual page 130

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