11
20
18
16
14
12
10
8
6
4
2
0
-2
-4
-6
-8
-10
-12
-14
-16
-18
-20
Außentemperatur [°C]
70
60
50
40
30
20
Tag-Betrieb
Absenk-Betrieb
Rücklauf- / Vorlauftemperatur [°C]
26_03_01_0078
Adjustment of programmed changeover between day/setback mode
The figure shows a standard heating curve with a slope of 0.8, relative to a set room
temperature for day mode of 20 °C. The lower curve represents the setback curve. For this,
a set room temperature for setback mode of 15 °C is used, in other words the heating curve
is subjected to a parallel offset.
HP return temp. / flow temp. [°C]
Day operation
Setback operation
Outside temperature [°C]
20
18
16
14
12
10
8
6
4
2
0
-2
-4
-6
-8
-10
-12
-14
-16
-18
-20
Außentemperatur [°C]
Rücklauf- / Vorlauftemperatur [°C]
70
60
50
40
30
20
geänderte Heizkurve
26_03_01_0079
Matching a heating curve to actual conditions
Example: During spring and autumn, the return or flow temperature of a heating system is
too low at an outside temperature between 5 and 15 °C, but is OK at outside temperatures
of ≤ 0 °C. This problem can be remedied by a parallel offset and a simultaneous reduction of
the heating curve. Prior to this adjustment, heating curve 1.0 was adjusted, relative to a set
room temperature of 20 °C. The dotted line indicates the modified heating curve at 0.83 and
a modified set room temperature at 23.2 °C.
HP return temp. / flow temp. [°C]
Modified heating curve
Outside temperature [°C]
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