Viessmann VITOTRONIC 100 Installation And Service Instructions Manual page 80

Installation
External hook−up in multi−boiler systems without LON
Vitocrossal 300 operation with a modulating burner
Connection modulating burner:
H Burner stage 1 fA of Vitotronic 100
H Plug−in connector lÖ of
Vitotronic 100 remains unused
H Burner stage 2 lÖ modulating
under the control of the on−site
modulation controller
H Burner stage 1 is enabled by the
modulation controller via external
demand aVH.
The DHW cylinder temperature and
the load−dependent cascade control
must be controlled by an external
control unit.
!
Please note
The contact "Boiler enable"
must be provided in
multi−boiler systems to prevent
boiler damage. This contact
must always be closed on the
lead boiler.
80
(cont.)