Vitoligno 300-C Installation/Service
5790 980 - 04
46
Installation
Electrical Connections
(continued)
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.
IMPORTANT
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.
Heating system part
Abbreviation
Max. number
Connect
Heating circuit
HC
3 (4)
Sensor, pump, mixing valve motor
Solar circuit
SOL
1
Sensors, pump, mixing valve motor
DHW heating
WWB
1
Sensor, pump
Flow limiter
VSB
1
Valve
DHW circulation pump
ZP
1
Pump
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.
Connections
For
Connection
numbers on HKK
Sensor connections
A
(accessory)
HC
301, 302, 303
WWB
302, 303
SOL
303 (collector) +
304 (lower DHW
heating)
Pump connections
B
(field supplied)
HC
310, 320, 330
WWB
320
SOL
330
Mixing valve motor
connections
C
DHW circulation pump
connections
C
Solar diverter valve
C
(field supplied)
HC
311, 321, 331
ZP
321, 331 (always
connect ZP to Y2)
SOL
331
Incorrect connections may cause malfunctions.
Observe the instructions provided in this chapter.
DIN rail X1
DIN rail X2
Note:
Maximum output 10 FLA share across 120VAC
outputs 310, 311, 321, 330 and 331.
