Viessmann Vitotronic 200 KW2 Installation And Service Instructions Manual page 50

Function description
Heating circuit control
Extended economy circuit
The heating circuit pump is switched
OFF if:
H the outside temperature exceeds
the value selected via coding
address A6
H the set room temperature is
reduced via coding address A9
H the mixer has been closed for
12 min (mixer economy function,
coding address A7)
H the actual room temperature
exceeds the value selected via
coding address b5.
Screed drying function
in conjunction with the mixer circuit
Note
Observe DIN 4725 part 4.
Four different temperature profiles
can be selected for drying the
screed. These profiles are activated
via coding address F1.
When the screed drying function is
activated, the heating circuit pump of
the mixer circuit is switched ON, and
the flow temperature will be held at
the selected profile. After completion
(30 days), the mixer circuit will again
be regulated automatically via the
set parameters.
50
(cont.)
Underfloor heating
in conjunction with the mixer circuit
An additional return temperature
sensor can be connected to achieve
an optimum underfloor heating
system. The control unit calculates a
set return temperature. Changes are
implemented, if the actual return
temperature deviates from the set
return temperature.
The temperature differential may be
changed via coding address C7.
When changing from central heating
with reduced room temperature to
central heating with standard
temperature, the set flow
temperature can be raised by 20 %
for one hour via code C9:1.
System dynamics
You can influence the control
characteristics of the mixer via
coding address C4.
Frost protection
When the outside temperature
reaches +1 ºC, a flow temperature of
15 to 42 ºC will be safeguarded
(two−point control).
For changes see coding address A3,
variable frost limit.
mixer circuit