Viessmann VITOCROSSAL 200 CI2 Series Installation Instructions Manual page 28

Installation
Electrical Connections
Function
Heating circuit 2 with mixing valve
Heating circuit 3 with mixing valve
Heating circuit 4 with mixing valve
Heating circuit 1 without mixing valve
(circulation pump downstream of low loss header)
Function extensions (e.g.):
Fault message input
Fault message output
Operating mode changeover
28
(continued)
Electronics module
ADIO
ADIO
ADIO
ADIO
DIO
DIO
DIO
Subscriber numbers of connected extensions
All extensions connected to the boiler must have a
subscriber number. The subscriber number is set on rotary
switch S1 at each extension.
Rotary switch S1 settings:
EM-EA1 extension (max. 3 extensions in one system)
Consecutive no. (any sequence): 1 up to 3
EM-P1 extension
– If no heating circuits with mixing valve are available
in the system: 1
– If heating circuits with mixing valve (EM-M1
extension) are present in the system: Always set
subscriber number for EM-P1 extension to the
consecutive number after EM-M1 extension.
EM-M1 extension
– Heating circuit 2 with mixing valve:
Rotary switch on extension kit to 1
– Heating circuit 3 with mixing valve:
Rotary switch on extension kit to 2
Note: EM-EA1 extensions may have the same subscriber
number as the EM-P1, or EM-M1 extension.
The following table shows an example of how a
system may be equipped.
Extension
EM-M1
EM-M1
EM-M1
EM-P1
EM-EA1
EM-EA1
EM-EA1
Vitocrossal 200 CI2 Installation
Setting Rotary switch S1
1
2
3
4
1
2
3