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Siemens Building Technologies
Basic Documentation RVA47.320
CE1P2379E
HVAC Products
Description of the heating engineer settings
15.07.2002
4.61.4
Demand for heat -
Setting 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]
0
2
4
6
8
10
10 20 30 40 50 60 70 80 90 100 110 120 130 [°c]
23
79
Z2
6
T =
130°
C
T =
50°
C
T =
70°
C
T =
90°
C
T =
110°
C
S =
5
°C
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:
C]
[
"
"
C]
[
e"
temperatur
actual
"
*
[V]
10
[V]
°
°
=
demand
heat
of
value
Maximum
