Dettson EVO Installation And Owner's Manual page 78

3. Installation method
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 . See Fig. 3-11
Wired Controller 1
11
Indoor Unit 1
HA HB
0
Putty
Trap
Indoor Unit 2
HA HB
1
Fig.3-11
Putty
Trap
Fig 3-12
Indoor Unit n
(n<=16)
HA HB
2
.....
Putty
Trap