Viessmann Vitoligno 300-C Installation And Service Instructions Manual page 36

Installation sequence
Electrical connections
Part of heating system
Heating circuit
Solar circuit
DHW heater
DHW circulation pump
Circulation pump for transferring
heat from the DHW cylinder.
Additional solar function
Flow limiter
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. 27 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)
The connections of a connection group belong
together. The appliances for a specific heating circuit
must be connected to the connections of a group.
36
(cont.)
Abbreviation
HC
SOL
TWE
ZP
UP
VSB
A
B
C
Max. quantity Connect
4 Sensor, pump, mixer motor
1 Sensors, pump, mixer motor
1 Sensor, pump
1 Pump
1 Pump
1 Valve
Note
For a detailed overview of connection options, see
"Connection options at the HKK PCB and extension
kits via KM-BUS"
For a detailed overview of connection options, see
ZPK 2.03 PCB in chapter "Connection and wiring dia-
gram".