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5
Functions of the heating circuit
5.1
Weather-compensated control
When weather-compensated control is used, the flow temperature is adjusted according to
the outdoor temperature. The heating characteristic in the controller defines the flow temper-
ature set point as a function of the outdoor temperature (–> Fig. 5).
t
VL
130
120
110
100
90
80
70
60
50
40
30
20
20
Fig. 5
Gradient characteristics
Basically, the following rule applies: a drop in outdoor temperature causes the flow tempera-
ture to rise. By varying the parameters Gradient and Level , you can adapt the characteristic to
your individual requirements. Increasing Gradient results in a higher flow temperature, de-
creasing Gradient in a lower flow temperature. The parameter Level performs a parallel
shifting of the heating characteristic in upward or downward direction.
Outside the times-of-use, reduced set points are used for control:
The reduced flow set point is calculated either as the difference between the adjusted values
for Day set point (rated room temperature) and Night set point (reduced room temperature)
or dependent on the parameter P9 (Set-back of flow temperature in reduced operation) with
the controller setting F1 - 1 and F9 - 0.
The parameters Max. flow temperature and Min. flow temperature mark the upper and lower
limits of the flow temperature.
˚
[
C]
16
12
8
4
0
3.2
2.9
2.6
2.4
2.2
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
-4
-8
-12
-16
-20
Functions of the heating circuit
t VL
Flow temperature
t A
Outdoor temperature
t
A
˚
[
C]
23
EB 5432 EN
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