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Siemens Building Technologies
HVAC Products
Demand for heat - Setting 4
4.61.4
External consumers can transmit a demand for heat in the form of an analog signal of
DC 0...10 V. The RVA47.320 converts this voltage signal to a temperature setpoint of
0...130 °C and considers this value when generating the setpoint of the cascade.
[v]
10
8
6
4
2
0
10
20
30
40
T = maximum value of heat demand
S = minimum limitation of heat demand = 5 °C
The setpoint for 10 V can be set with parameter "Maximum value of heat demand"
(operating line 172, setting range 5...130 °C). The voltage corresponding to the
displayed temperature can then be calculated as follows:
10
[V]
" *
actual
temperatur
=
[V]
"
Maximum
value
of
Basic Documentation RVA47.320
Description of the heating engineer settings
90 100 110 120 130 [°c]
50
60
70
80
°
e"
[
C]
°
[ "
C]
heat
demand
109/166
CE1P2379E
15.07.2002
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