Viessmann VITOLIGNO 300-C Installation And Service Instructions Manual page 48

Installation sequence
Electrical connections
Part of heating system
Heating circuit
Solar circuit
DHW heating
Flow limiter
DHW circulation pump
Power supply for DHW circulation pump
DHW circulation pumps equipped with their own inter-
nal control unit must be connected via their own sepa-
rate mains connection. Mains connection via the Eco-
tronic control unit or Ecotronic accessories is not per-
missible.
HKK PCB
A1 A2 A3
Fig. 43 HKK PCB
There are 3 connection groups on the HKK PCB:
A1 (Only for one HC)
A2 (For HC or TWE)
A3 (For HC, TWE or SOL)
Note
The connections of a group belong together. The appli-
ances for a specific heating circuit must be connected
to the connections of a group.
48
(cont.)
Abbreviation
HC
SOL
TWE
VSB
ZP
A
B
C
Max. quantity Connect
4 Sensor, pump, mixer motor
1 Sensors, pump, mixer motor
1 Sensor, pump
1 Valve
1 Pump