Viessmann Vitotronic 200 Series Operating Instructions For The System User page 46

Appendix
Terminology
(cont.)
110
100
90
80
70
60
50
40
30
Fig. 37
For outside temperature
Underfloor heating system, slope 0.2 to 0.8
A
Low temperature heating system, slope 0.8 to 1.6
B
Heating system with a boiler water temperature in
C
excess of 75 °C, slope 1.6 to 2.0
46
10 5 0 -5 -10 -15 -20
Outside temperature in °C
14 °C:
−
Slope
1.8
1.6
C
1.4
1.2
1.0
B
0.8
0.6
0.4
A
0.2
-25 -30