Viessmann Vitoligno 300-H Installation And Service Instructions For Contractors page 35

Electrical connections
Fig. 27 Extension kit
S1 Rotary switch
F1 Fuse
Connections per extension kit
Connections
∼
Power supply 230 V /50 Hz
Sensor connections
Pump connection
Mixer motor connection
The distinctiveness and sequence of the extension kits
must be defined via rotary selector S1 in the extension
kit.
Extension kit S1 rotary selector position
E1 1
E2 3
E3 5
(cont.)
S1
for
Extension kit
Accessories
HC, TWE (return temperature sen-
sor)
TWE (cylinder temperature sensor)
HC, TWE
HC, VSB
0
0
0
F1
5 2
2 0
4 0
A
4 0
Connection numbers in extension
kit
40
40A
2
17
20
52
Note
For KM-BUS connection to the PCB, see page 148.
Installation sequence
35