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Siemens Building Technologies Basic documentation RVD240 CE1P2384en
HVAC Products 12 Function block Space heating 27.05.2004
0
5
10
15
20
25
T
AD
T
AM
t
2522D17
T
A
T
A
Progression of the actual, composite and attenuated outside temperature
T
A
Actual outside temperature
T
AD
Attenuated outside temperature
T
AM
Composite outside temperature
t Time
12.2.2 Room temperature
The room temperature is included in the control process as follows:
• With room temperature-compensated flow temperature control, the deviation of the
actual room temperature from the room temperature setpoint is the only compensat-
ing variable
• With weather-compensated flow temperature control with room temperature influ-
ence, it is an additional compensating variable
The gain factor for the room temperature influence can be adjusted (operating line 70).
This factor indicates to what extent a deviation in the room changes the room tempera-
ture setpoint, thus having an indirect impact (via the slope) on the flow temperature
control:
0 = room temperature deviations have no impact on the generation of the setpoint
20 = room temperature deviations have a maximum impact on the generation of the
setpoint
A room temperature sensor is mandatory (room unit).
2462D05
w
R
- x
R
E
Gain factor of room temperature deviation
–∆w
R
Decrease of room temperature setpoint
+∆w
R
Increase of room temperature setpoint
E Effect
w
R
–x
R
Setpoint minus actual value (room temperature)
The setpoint change ∆w
R
is calculated in the static state according to the following for-
mula:
Factor of room influence E
∆w
R
=
2
× ( w
R
- x
R
)
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