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Siemens Building Technologies Basic documentation RVD240 CE1P2384en
HVAC Products 5 Function block Space heating 27.05.2004
5 Function block Space heating
This function block contains settings and readouts that are intended for the end-user.
5.1 Operating lines
The buttons for selecting the operating lines and for changing settings are described in
section 31.1 "Operation ".
Line Function, parameter Unit Factory setting Range
1 Current room temperature setpoint Display function
2 Reduced room temperature setpoint °C 14 variable
3 Setpoint for frost protection / holiday mode °C 8 8...variable
5 Heating curve slope 15 2.5...40
6 Weekday for entering the heating program Current weekday 1…7, 1-7
7 Start of heating period 1 hh:min 06:00 --:-- / 00:00…24:00
8 End of heating period 1 hh:min 22:00 --:-- / 00:00…24:00
9 Start of heating period 2 hh:min --:-- --:-- / 00:00…24:00
10 End of heating period 2 hh:min --:-- --:-- / 00:00…24:00
11 Start of heating period 3 hh:min --:-- --:-- / 00:00…24:00
12 End of heating period 3 hh:min --:-- --:-- / 00:00…24:00
Notes on settings and explanations on every function block are given in the descrip-
tions of the individual functions.
5.2 Settings and displays
• The nominal room temperature setpoint is adjusted with the setpoint knob. Its scale
is calibrated in °C room temperature. The room temperature will be maintained at the
adjusted setpoint:
− In automatic operation during the heating periods
− In continuous operation always
• On operating line 1, the LCD shows the current room temperature setpoint of each
heating circuit Depending on the operating mode and the operating state, the room
temperature setpoint can be:
Operating mode and operat-
ing state
Displayed setpoint
Heating to the nominal set-
point
Adjustment made with the setting knob (incl. the
readjustment made on the room unit)
Heating to the reduced set-
point
Reduced setpoint (setting operating line 2)
Continuous operation Adjustment made with the setpoint knob
Quick setback Reduced setpoint (setting operating line 2)
Frost protection Setpoint for frost protection (setting operating line 3)
OFF by ECO • During heating periods: adjustment made with
the setting knob (incl. the readjustment made on
the room unit)
• Outside heating periods: Reduced setpoint
• The reduced room temperature setpoint of each heating circuit is to be set sepa-
rately on operating line 2; at the top, the setting range is limited by the nominal set-
point; at the bottom, by the setpoint for frost protection. This is the setpoint main-
tained outside the heating periods
• The setpoint for frost protection of each heating circuit is to be set separately on
operating line 3; the setting range is from 8 °C (fixed value) to the adjusted reduced
setpoint. Hence, this frost protection acts as frost protection for the house or building.
At the same time, this setting represents the setpoint for the holiday mode. A holiday
program can be entered either on the controller or on the QAW70 room unit. For
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