Siemens LMS14 User Manual page 137

Calculation
Key
Heating curve
displacement
Key
Building Technologies Division
The resulting flow temperature can be calculated as follows:
TV = TR + [ 2 + (TR - TAgem) - 0.005 * (TR - TAgem)2 ] * s
The impact of compensation variant Weather compensation with room influence on the
flow temperature setpoint is calculated as follows:
TV = TRw * (1 + s)
Line no. Meaning
TV
Resulting flow temperature adaption
TRw
Room temperature setpoint readjustment (due to room influence)
TV Flow temperature setpoint heating circuit
TR Room temperature setpoint – heat gains + room influence
TAgem Composite outside temperature
s Heating curve slope
Line no.
HC1 HC2 HC3
721 1021 1321
Parallel displacement of the heating curve is used to change the flow temperature
evenly across the entire outside temperature range or, in other words, if the room
temperature is always too high or too low, a readjustment must be made via parallel
displacement.
TV
°C
100
90
80
70
60
50
40
30 30
20 10
10
10
0
Figure 18: Heating curve – heating curve displacement
Line no. Meaning
8700 TA Outside temperature
TRw Room temperature setpoint
TV Flow temperature
User Manual LMS14...
6 The settings in detail
Operating line
Heating curve displacement
0 -10 -20
0
-30
°C
8700
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07.05.2014
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