Viessmann VITOLIGNO 300-C Installation And Service Instructions Manual page 46

Installation
Electrical Connections
IMPORTANT
Incorrect connections may cause malfunctions.
Observe the instructions provided in this chapter.
Heating system part
Heating circuit
Solar circuit
DHW heating
Flow limiter
DHW circulation pump
Connections
Sensor connections A
(accessory)
Pump connections B
(field supplied)
Mixing valve motor
connections C
DHW circulation pump
connections C
Solar diverter valve C
(field supplied)
46
(continued)
Abbreviation
HC
SOL
WWB
VSB
ZP
For Connection
numbers on HKK
HC 301, 302, 303
WWB 302, 303
SOL 303 (collector) +
304 (lower DHW
heating)
HC 310, 320, 330
WWB 320
SOL 330
HC 311, 321, 331
ZP 321, 331 (always
connect ZP to Y2)
SOL 331
DIN rail X1
DIN rail X2
Vitoligno 300-C Installation/Service
Connecting the heating circuits, solar circuit, DHW etc.
Various parts of a heating system can be connected to
the boiler control unit. The associated appliances can be
directly connected to the PCB HKK or to extension kits
(via KM-BUS).
Note: For a detailed overview of connection options,
see page 48.
Max. number
3 (4) Sensor, pump, mixing valve motor
1 Sensors, pump, mixing valve motor
1
1
1
Power supply for DHW recirculation pump
DHW recirculation pumps equipped with their own internal
control unit must be connected via their own separate
mains connection. Power supply connection via the
Ecotronic control unit or Ecotronic accessories is not
permissible.
PCB HKK
There are 3 connection groups on the HKK PCB:
A1 (only for one HC)
A2 (for HC or WWB)
A3 (for HC, WWB or SOL)
The connections of a group belong together.
The appliances for a specific heating circuit must be
connected to the connections of a group.
Note: Maximum output 10 FLA share across 120VAC
outputs 310, 311, 321, 330 and 331.
Connect
Sensor, pump
Valve
Pump