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Siemens Building Technologies
Basic Documentation RVP540 / RVP550
CE1P2488en
HVAC Products
Description of the heating engineer settings
18.10.2002
4.268 Maximum value of heat demand Ux
•
Maximum heat demand can be defined
At output Ux, which is defined for the heat demand (operating line 890, setting 5 - 8),
the maximum value of heat demand can be fixed.
Setting range
Unit
Factory setting
5...130 °C
100
The controller can generate a heat demand in the form of an analog voltage signal of
DC 0…10 V.
The maximum heat demand is to be defined on this operating line (corresponding to
10 V).
The conversion of the required temperature to a voltage signal takes place in a linear
fashion based on the following calculation.
[v]
0
2
4
6
8
10
10
20
30
40
50
60
70
80
90 100 110 120 130 [°c]
23
79
Z
2
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
DC 0 – 10 V
≙
0 – 100 %
The voltage can be converted according to the following equation:
C]
[
demand"
e
temperatur
of
limitation
maximum
"
C]
[
demand"
e
temperatur
current
"
*
[V]
10
[V]
°
°
=
Benefit
Description
Setting
Effect
