Viessmann VITOTRONIC 100 Installation And Service Instructions Manual page 134

Components
Function extension 0−10 V
Boiler system with
Vitotronic 100
Multi−boiler system with
external cascade
Vitotronic 100 with
enable command via
0−10 V signal
Vitotronic 100 with
0−10 V signal and enable
via switching output aVH
134
(cont.)
Function
Demands to the boiler
in accordance with the
set operating mode and
set temperature; the
0−10 V hook−up creates
an additional set value
Function
Boiler control via 0−10 V
hook−up:
0 to 1 V
H Boiler blocked
H Butterfly valve closed
H Boiler circuit or shunt
pump OFF
1 to 10 V
H Boiler water
temperature default
H Enable boiler; the
boiler is held at its
minimum
temperature
H Butterfly valve open
H Boiler circuit or shunt
pump enabled
The boiler is enabled;
the boiler is held at its
minimum temperature
1−10 V additional
temperature default
Condition at Vitotronic
Code "01:1"
Preconditions
Code "01:3" at
Vitotronic 100
Note
On the lead boiler, the
voltage must be higher
than 1 V.
H Code "01:3" at
Vitotronic 100
H Contact at terminal 2
and 3 of plug aVH
closed
Note
This contact must
always be closed on the
lead boiler.