Viessmann VITOTRONIC 100 Installation And Service Instructions Manual page 73

External hook−up in single boiler systems
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
143
A
C
B
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
C unused
Installation
73