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Energy-efficient Operation
7.1.1
Setting examples
Standard external air temperature in °C
Required flow temperature
(at standard design temperature)
Temperature spread flow/return-flow
Required return temperature
(at standard design temperature)
Setting for end point
of heating curve
A heat distribution system (e.g. underfloor heating) is
dimensioned for a maximum flow temperature at a particular
standard external temperature. This is dependent on the location
of the heat pump and, in Germany, lies between -12 and -18 °C.
The max. return temperature that is set on the heating controller
must be entered for an external temperature of -20 °C. This is
done by entering the maximum return temperature for the given
standard external temperature in Fig. 7.2 on p. 13. The setting at
-20 °C can be read using the curves.
Fig. 7.2:
Heating curves to calculate the max. return set temperature
Underfloor heating
35 °C/28 °C
-12
-14
-16
-12
35 °C
35 °C
35 °C
55 °C
7 °C
7 °C
7 °C
10 °C
28 °C
28 °C
28 °C
45 °C
30 °C
29 °C
29 °C
48 °C
Example 1
NOTE
Step 1:
Adjust the heating curve to suit the respective building and local
conditions by setting the gradient (heating curve end point).
Step 2:
Set the desired temperature level via a parallel shift of the heating curve
upwards or downwards (indicator bar).
Radiators
55 °C/45 °C
-14
-16
55 °C
55 °C
10 °C
10 °C
45 °C
45 °C
47 °C
46 °C
Example 2
7.1
E-13
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