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Siemens Building Technologies Basic Documentation RVA63.242, RVA53.242 CE1P2373E
Landis & Staefa Division General control processes 26.03.2001
6.4 Automatic 24-hour heating limit
Automatic shut-down of heating.
Saving energy without sacrificing comfort.
This is a fast-acting savings function since the heating is switched off when there is no
more demand for heat. Economical operation is ensured throughout the year,
especially during intermediate seasons. Manual switching off is no longer required.
The automatic 24-hour heating limit does not function in continuous operation .
The display shows the automatic 24-hour heating limit as “ECO”
1.1.3 Without room influence
If no room unit is connected, the room temperature setpoint will not be readjusted by
the room influence. In that case, the automatic 24-hour heating limit operates according
to the selected setpoint of or ..
The temperature basis used for this process are the values of the flow temperature
setpoint and the current room temperature setpoint.
If the flow temperature setpoint falls below the room temperature setpoint plus a
correction value, the heating will be switched off.
• Heating OFF
TVw = TRw + 2 S/10
If the flow temperature setpoint exceeds the room temperature setpoint plus a
correction value, the heating will be switched on.
• Heating’s switch-on point
TVw = TRw + 4 S/10
TVw Flow temperature setpoint
TRw Room temperature setpoint
s Slope of heating curve
6.4.1 With room influence
The automatic 24-hour heating limit operates depending on the current flow
temperature setpoint. If a room unit is connected, the room influence continuously
readjusts the flow temperature setpoint.
This means that the automatic 24-hour heating limit differs when room influence is
used.
The temperature basis used for this process are the values of the flow temperature
setpoint and the current room temperature setpoint.
Benefits
Description
Notes
Introduction
Process
Switching off
Switching on
Introduction
Process
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