Dettson EVO Installation And Owner's Manual page 77

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. See Fig. 3-10
Wired Controller 1
NOTE:
Wire controller with Wi-Fi function does not have
this function
0
.
Indoor Unit
Wired Controller 2
HA HB
1
Fig.3-10
10