Viessmann Vitotronic 200 Installation And Service Instructions Manual page 76

Function description
Cylinder temperature control
Brief description
The cylinder temperature controller
is a constant temperature controller.
It acts as the result of starting and
stopping the cylinder primary pump.
The switching differential is ±2.5 K.
When the DHW cylinder is heated
up, a set boiler water temperature is
defaulted that lies 20 K above the
set DHW temperature (adjustable
via coding address "60").
Functions
Time program
An automatic program or an individual
time program may be selected for
DHW heating and the control of the
DHW circulation pump.
Compared with the heating circuit
heat-up phase, DHW heating starts
30 min earlier in automatic mode.
The individual time program enables
up to four periods per day to be set via
the time switch to control DHW heat-
ing and four periods for the DHW cir-
culation pump.
Priority control
With priority control: (Code "A2:2"):
The set flow temperature will be
adjusted to 0 °C whilst the cylinder
is being heated up.
Without priority control:
The heating circuit control unit con-
tinues to operate with the same set
value.
76
During cylinder heating, central
heating is switched OFF (optional
cylinder priority).
Coding addresses that influence
the cylinder temperature control:
54, 55, 56, 58 to 62, 64, 66 ,67, 70
to 75, A2.
For a description, see the coding
overview.
All cylinder heating sequences will be
completed, independent of the time
program.