Heating Circuit Control - Viessmann Vitotronic 100 GC1 Installation And Service Instructions Manual

Heating circuit control

Brief description
The control unit provides control
circuits for one high temperature
(boiler) circuit and two mixing valve
circuits.
The set supply temperature of every
heating circuit results from the outdoor
temperature, the set room temperature,
the operating mode and the heating
curve.
The supply temperature of the system
circuit corresponds to the common
Functions
The high temperature (boiler) circuit is
subject to the boiler water temperature
and its control range limits.
The heating circuit pump is the
controlling element. The mixing valve
circuit supply temperature is recorded
by the supply temperature sensor.
system supply temperature.
The supply temperature of the
mixing valve circuits is regulated
by the stepped opening or closing
of the mixing valves.
The mixing motor control changes
the actuating and pause times subject
to the control difference
(control deviation).
Time program
The control unit timer changes in
accordance with the times programmed
in the room heating and DHW heating
program between the heating with
normal room temperature and heating
with reduced room temperature
operating modes.
Every operating mode has its own set
level.
Function description – Vitotronic 300-K, MW1S
Coding addresses which influence the
heating circuit control
9F, A2 to A7, A9, C4 to C7, C8, F1,
F2.
For a description, see the coding
overview.
Outdoor 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 outdoor
temperature. An average outdoor
temperature (dampened) is used
for control purposes. This comprises
the actual and the adjusted outdoor
temperature.
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