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Siemens Building Technologies Basic Documentation RVD230 CE1P2383en
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 32.1 "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 ad-
justed setpoint:
− In automatic operation during the heating periods
− In continuous operation always
• On operating line 1, the LCD shows the current room temperature setpoint. Depending
on the operating mode and the operating state, the room temperature setpoint can be:
Operating mode and operating
state
Displayed setpoint
Heating to the nominal setpoint Adjustment made with the setting knob (incl.
the readjustment made on the room unit)
Heating to the reduced setpoint 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 is to be set on operating line 2; at the top, the
setting range is limited by the nominal setpoint; at the bottom, by the setpoint for frost
protection. This is the setpoint maintained outside the heating periods
• The setpoint for frost protection is to be set 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 more
detailed information, refer to chapter 9 "Function block Holiday settings" (operating
lines 31…33) and section 30.3 “Combination with room unit QAW70"
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