Siemens RVD110 - Heating Curve; General, Basic Setting

34/94
Siemens Building Technologies Basic Documentation RVD110, RVD130 CE1P2381E
HVAC Products 11 Function block Space heating 27.05.2004
Calculation of the setpoint change ∆w
R
is made in the steady state according to the
following formula:
Room authority E
∆w
R
=
2
× ( w
R
- x
R
)
2462D06
S
Effect of room temperature setpoint change on the flow temperature setpoint
∆w
R
Change of room temperature setpoint
s Slope of heating curve
∆w
VT
Change of flow temperature setpoint
The flow temperature setpoint change ∆w
VT
is calculated according to the following
formula:
∆w
VT
= ∆w
R
× ( s × 0.1 + 1 )
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.
20 10
0
-10 -20 -30
90
80
70
60
50
40
30
40
35 30 27,5 25 22,5
20
17,5
15
12,5
10
7,5
5
2,5
100
2381D05
T
V
T
AM
110
20
S
=
S Slope
T
AM
Composite outside temperature
T
V
Flow temperature
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