Heating Circuit Control - Viessmann Vitotronic 200 KW2 Installation And Service Instructions Manual

Function description

Heating circuit control

Brief description
The control unit provides control
circuits for one heating circuit
without mixer and one mixer circuit.
The set flow temperature of every
heating circuit results from the
outside temperature, the set room
temperature, the operating mode
and the heating curve.
The flow temperature of the heating
circuit without mixer is equal to the
boiler water temperature.
The flow temperature of the mixer
circuit is regulated by a stepped
opening or closing of the mixer.
Functions
The heating circuit without mixer is
subject to the boiler water
temperature and its control range
limits.
The heating circuit pump is the only
actuator. The flow temperature
sensor detects the mixer circuit flow
temperature.
Time program
The control unit time switch changes
in accordance with the times
programmed in the Heating and
DHW program between the Central
heating with standard room
temperature and Central heating
with reduced room temperature
operating modes.
Every operating mode has its own
set level.
48
The mixer motor control changes the
actuating and pause times subject to
the control differential (control
deviation).
Coding addresses which influence
the heating circuit control
05, A0 to Fb.
For a description, see the coding
overview.
Outside temperature
A heating curve must be set up for
matching the control unit to the
building and the heating system.
The heating curve characteristics
determine the set boiler water
temperature subject to outside
temperature. An average outside
temperature is used for control
purposes. This is derived from the
actual and the adjusted outside
temperature.