Viessmann VITOLIGNO 300-H Operating Instructions For The System User page 29

Changing the heating curve
90
80
70
60
50
40
30
Example for outside temperature
−14 °C:
A Underfloor heating system, slope
0.2 to 0.8
B Low temperature heating system,
slope 0.8 to 1.6
C Heating system with a boiler water
temperature in excess of 75 °C,
slope 1.6 to 2.0
(cont.)
10 0
Slope
-10 -20
-14
Outside temperature in °C
Central heating
1.4
C
1.2
1.0
B
0.8
0.6
0.4
A
0.2
-30
29