STIEBEL ELTRON WPF 5 basic

OPERATION
Operation
14 | WPF basic www.stiebel-eltron.com
Heating curve diagram
One heating curve can be adjusted for heating circuit 1 and heating
circuit 2 respectively.
At the factory, heating curve 0.6 is set up for heating circuit 1 and
heating curve 0.2 for heating circuit 2.
These heating curves relate to a set room temperature of 20 °C.
1,5
2
1,2
1
0,6
0,4
0,2
2,53
20 18 16 14 12 10
8 6 4 2 0
-2 -4 -6 -8
-10 -12 -14 -16 -18 -20
100
80
60
40
20
0,8
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Y Heating circuit 1, heat pump return temperature [°C]
Heating circuit 2, heat pump flow temperature [°C]
X Outside temperature [°C]
Adjustment of programmed changeover between day and
setback mode
The figure shows a standard heating curve with a slope of 0.8, rel-
ative to a set room temperature for day mode of 20°C. The bottom
curve is setback mode. The set room temperature is reduced to 15
°C for setback mode. The heating curve is shifted down parallel
to the original curve.
20 18 16 14 12 10
8 6 4 2 0
-2 -4 -6 -8
-10 -12 -14 -16 -18 -20
70
60
50
40
30
20
1
2
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Y Return/flow temperature [°C]
X Outside temperature [°C]
1 Day mode
2 Setback mode
Adapting a heating curve
Example:
During spring and autumn, the temperature of a building’s heating
system is too low at an outside temperature between 5 °C and
15°C, despite open radiator valves, but is OK at outside tempera-
tures of ≤ 0 °C. This problem can be remedied with 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 temper-
ature at 23.2 °C.
20 18 16 14 12 10
8 6 4 2 0
-2 -4 -6 -8
-10 -12 -14 -16 -18 -20
70
60
50
40
30
20
26�03�01�1302
Y Return/flow temperature [°C]
X Outside temperature [°C]