Midea Ducted Series - Page 44

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. 3-10
For some units, one wired controller can support multiple units (a maximum of 16 units). In this case, the
wired controller and unit need to be connected to the HA and HB ports at the same time. In group control,
there will be no error displayed on the wired controller . SeeFig. 3-11
42
HA HB
HAHB
HAHB
Indoor Unit
Wired Controller 1
Wired Controller 2
Fig.3-10
0
1
NOTE: Wire controller with WiFi function does not have this function.
Fig 3-12
Putty
Putty
Putty
Trap
Trap
Trap
HA HB
HA HB
HA HB
Indoor Unit 2 Indoor Unit n
(n<=16)
Indoor Unit 1
Wired Controller 1
HAHB
Fig.3-11
0 1 2
.....