Carrier KJR-120 Serie Installationshandbuch Seite 12

3. Installation method
The main/secondary wired controller can be used to
enable two wired controllers to control one unit, and
the wired controllers connect to the unit HA and HB
ports through the HA and HB port on the controller.
There is no polarity between HA and HB. SeeFig. 3-8
Indoor Unit
HA HB
0
Wired Controller 1
1
Wired Controller 2
Fig 3-8
9-GB