Viessmann VITOTRONIC 100 Installation And Service Instructions Manual page 40

Heating system designs
System version 13
Codes must be set on every Vitotronic 100.
Required coding
01 : 2 Multi−boiler system with cascade control via LON BUS
01 : 3 Multi−boiler system with external cascade control via switching
contacts
02 : 2 Modulating burner operation
0d : 0 Without Therm−Control
Possible applications
If the distributor is located in remote
sub−stations (> 20 m). The heat
transfer to the heating circuits must
be able to be reduced.
The cascade and cylinder control
must be provided by a higher control
unit.
Vitocrossal 300 are operated via the
boiler control unit
modulating burners are regulated.
Vitocrossal 300 are equipped with
two return connectors. The heating
circuits with the higher return
temperature are connected to the
upper return connector, and those
with lower return temperatures to
the lower return connector. Note:
connect at least 15% of the rated
output to the lower return connector.
*1
If required.
40
(cont.)
two−stage or
*1
Motorised butterfly valve
52
A1
N
A
open closed
gS A1 Plug on Vitotronic 100
aBH
Plug on Vitotronic 100
A
Contactor relay,
part no. 7814 681
B
Motorised butterfly valve 1
C
Motorised butterfly valve 2
156
L N
N N
open closed
B C