Operating instructions

73
Installation
External hook−up in single boiler systems (cont.)
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
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
A Vitotronic100
B Burner control
C unused
5862730GB
A
143 146
C
B