47
5790 980 - 04
Vitoligno 300-C Installation/Service
Installation
Electrical Connections
(continued)
Mixing valve extension kit (accessory)
Max. 3 mixing valve extension kits can be connected to
the boiler control unit (accessory). Each extension kit must
be connected to the PCB KSK via KM-BUS; see page 146.
Legend
S1 Rotary selector
F1 MCB/fuse
The distinctiveness and sequence of the extension kits
must be defined via rotary selector S1 in the extension kit.
Connections per extension kit
Connections
For
Connection
numbers in
extension kit
Sensor connections HC, WWB (return
temperature sensor)
2
WWB (tank
temperature sensor)
17
Pump connection
HC, WWB
20
Mixing valve motor
connection
HC, VSB
52
Extension kit
S1 rotary selector position
E1
1
E2
3
E3
5
Allocation of connections
Note:
For a detailed overview of connection options,
see page 48.
It is not possible to connect solar control module type
SM1.
Solar at the boiler only possible if WWB or the buffer
tank (3-5 sensors) are connected to the Ecotronic.
PCB HKK
Extension kits
1x HC at A1
2x HC at A1 and A2
3x HC at A1, A2 and A3
1x HC at E1
2x HC at E1 and E2
3x HC at E1, E2 and E3
Note:
Max. 4x HC can be connected in total.
If 0x HC or 1x HC: WWB at A2
If 2x HK: WWB at A3
Note:
Always connect WWB
immediately downstream of
HC without a gap.
Exception: If only WWB is
connected to the HKK, connect
it at A2.
WWB at E1, E2 or E3
Note:
Connect WWB
downstream of HC
without a gap.
ZP only at A2 or A3
VSB possible in
addition to WWB
ZP possible in addition to WWB
SOL only at A3
Legend
A
DIN rail X2 boiler junction box
B
Mixing valve extension module (accessory)
Refer to the mixing valve extension module
Installation Instructions for additional information.
