Viessmann Vitotronic 200 Installation And Service Instructions Manual page 71

Heating circuit control
Brief description
The set flow temperature of the sys-
tem circuit (heating circuit A1) is
determined by the following para-
meters:
Outside temperature
Set room temperature
Operating mode
Heating curve slope and level
The boiler coding card defaults a
minimum boiler water temperature
that must be maintained to protect
the boiler.
Functions
The system circuit (heating circuit A1)
is subject to the boiler water tempera-
ture and its control range limits.
Time program
The control unit time switch regulates
in accordance with the times pro-
grammed in the "Heating and DHW"
program between "Central heating
with standard room temperature" and
"Central heating with reduced room
temperature".
Outside temperature
A heating curve must be set up for
matching the control unit to the build-
ing and the heating system (see
page 43).
Function description
The system circuit flow temperature
is equal to the boiler water tempera-
ture.
Coding addresses that influence
the heating circuit control:
A0 to Fb.
For a description, see the coding
overview.
The heating circuit pump is the only
actuator.
Every operating mode has its own set
level.
The heating curve characteristics
determine the set boiler water tem-
perature subject to outside tempera-
ture. An average outside temperature
is used for control purposes. This
comprises the actual and the adjusted
outside temperature.
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