Viessmann VITOCAL 222-G Operating Instructions Manual page 52

Appendix
Terminology
(cont.)
Heating/cooling curve
Heating and cooling curves illustrate the
relationship between the outside tem-
perature, room temperature (set value)
and the (heating circuit) flow tempera-
ture.
Heating curve:
■ The lower the outside temperature,
the higher the flow temperature in the
heating circuit.
Cooling curve:
■ The higher the outside temperature,
the lower the flow temperature in the
cooling circuit.
90
80
70
60
50
40
30
For outside temperature −14 °C:
A Underfloor heating, slope 0.2 to 0.8
B Low temperature heating, slope 0.8 to 1.6
52
In order to guarantee sufficient heat at
any outside temperature, the conditions
of your building and your heating system
must be taken into consideration. For
this you can adapt the heating curve (see
page 22).
The cooling curve can be set by your
local heating contractor.
Example:
The illustrated heating curves apply sub-
ject to the following settings:
■ Heating curve level = 0
■ Standard room temperature (set
value) = 20 ºC
10 0 -10
Outside temperature in °C
Slope
1.2
1.0
0.8
0.6
0.4
0.2
-20 -30
-14
B
A