Viessmann VITOLIGNO 300-C Installation And Service Instructions Manual page 49

Electrical connections
Connections
Sensor connections
A
Pump connections
B
Mixer motor connections
C
DHW circulation pump connections
Solar diverter valve
C
Extension kits (KM-BUS)
Max. 3 extension kits can be connected to the boiler
control unit. Each extension kit must be connected to
the KSK PCB via KM-BUS.
Fig. 44 Extension kit
S1 Rotary switch
F1 Fuse
(cont.)
for
HC
TWE
SOL
HC
TWE
SOL
HC
C
ZP
SOL
S1
Connection numbers on HKK
301, 302, 303
302, 303
303 (collector) + 304 (lower DHW
heating)
310, 320, 330
320, 330
330
311, 321, 331
321, 331
(Always connect ZP to Y2)
331
F1
5 2
2 0
4 0
A
4 0
Installation sequence
49