Viessmann Vitotron 100 Operating Instructions For The System User page 18

Settings
Control panel VMN3
Heating curve
The boiler control unit ensures that the correct
temperature is maintained in the central heating
installation depending on the outside temperature.
When there is a low outside temperature, the heat
demand inside the building is higher. On the other
hand, when there is a high outside temperature, it is
not necessary to maintain a high temperature inside
the installation. The correlation between the outside
temperature and the temperature of the heating
installation can be represented graphically with a
heating curve. The diagram below shows a summary
of the heating curves for a set room temperature of
22 °C. The corresponding heating curve must be
selected according to the building properties, climate
zone and type of heating installation.
Tch [°C]
90,0
A
80,0
70,0
60,0
50,0
40,0
30,0
20,0
20 10
If an offset of the heating curve is required, the
parameter [heating curve] must be changed. The
diagram below shows heating curve no. 12 with
an offset of -10 °C and 10 °C.
Tch [°C]
90,0
A
80,0
70,0
60,0
50,0
40,0
30,0
20,0
20 10
18
(cont.)
0
0
Tout [°C]
-10 -20
Tout [°C]
-10 -20
A Heating curve no. (p = 0)
A p – heating curve offset