Viessmann Vitotronic 200 KW2 Installation And Service Instructions Manual page 47

Boiler temperature control
Auxiliary circuits
H Two−stage/modulating burner:
An extension can be connected for
controlling a two−stage/modulating
burner.
H External hook−up (reports) via
control module V, (see page 75).
H Function extension 0−10 V
(see page 78).
H X12 plug for external burner ON
control (see page 18).
Control sequence
Boiler goes cold
(set value 2 K)
The burner start signal is set for a set
boiler water temperature 2 K, and
the burner starts its own monitoring
program.
The burner start may be delayed by a
few minutes subject to the number
of the auxiliary circuits and the
combustion type.
(cont.)
Boiler heats up
(set value +2 K)
The burner shuts down.
Modulating burner:
The burner shutdown point is
determined by the switch−off
differential (coding address 13).
Function description
47