Operating instructions
81
Installation
External hook−up in multi−boiler systems without LON (cont.)
Zero volt contacts of the higher control unit
with modulation controller:
Enable boiler, open or close the butterfly
valve
Burner stage 1 (base load) ON
Modulation controller:
Reduce burner output
Increase burner output
A Vitotronic100
B Burner control
C unused
5862730GB
146143