Heating Curve; General, Basic Setting - Siemens RVD110 Basic Documentation

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HVAC Products
Calculation of the setpoint change ∆w
following formula:
Room authority E
∆w
=
R
2
Effect of room temperature setpoint change on the flow temperature setpoint
∆ w
Change of room temperature setpoint
R
s Slope of heating curve
∆ w
Change of flow temperature setpoint
VT
The flow temperature setpoint change ∆w
formula:
∆w = ∆w
× ( s × 0.1 + 1 )
VT R
11.3

Heating curve

11.3.1 General, basic setting

With weather-compensated flow temperature control (with or without room temperature
influence), the assignment of the flow temperature setpoint to the outside temperature
is made via the heating curve. The heating curve slope is to be set on operating line 5.
T
V
S =
110
100
90
80
70
60
50
40
30
20
0
20 10
S Slope
T Composite outside temperature
AM
T Flow temperature
V
The heating curve has a fixed tilting point at an outside temperature of 22 °C and a flow
temperature of 20 °C. It can be adjusted around this point in the range 2.5 ...40 in in-
crements of 0.5.
Each heating curve has a substitute line which intersects the tilting point and "its" heat-
ing curve at an outside temperature of 0 °C. Its slope is set on the controller and is
calculated as follows:
10 × ∆T
V
s =
∆T
AM
Basic Documentation RVD110, RVD130
11 Function block Space heating
is made in the steady state according to the
R
× ( w - x )
R R
S
is calculated according to the following
VT
40 35 30 27,5 25
-10 -20
22,5
20
17,5
15
12,5
10
7,5
5
2,5
T
-30
AM
CE1P2381E
27.05.2004