Viessmann VITOTRONIC 100 Installation And Service Instructions Manual page 71

External hook−up in single boiler systems
Low temperature boiler operation with a modulating burner
Connection modulating burner:
H Burner stage 1 fA of Vitotronic 100
H Plug−in connector lÖ from
Vitotronic 100 via the modulation
controller (on site) to burner
plug−in connector lÖ.
H Adjust the minimum temperatures
at the higher control unit with the
modulation controller 5 K higher
than the lower boiler water
temperature.
A
B
143 146
Zero volt contacts of the higher control unit
with modulation controller:
Burner stage 1 (base load) ON
Modulation controller:
Reduce burner output
Increase burner output
(cont.)
A Vitotronic 100
B Burner control
Installation
71