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Operation All operating elements that are required for normal operation are easily accessible:
Operating
mode buttons
Info button for the actual meter readings
Economy button
Setpoint readjustment knob
P
rogramming To program a
nd display specific values, a cover must be removed. The unit then
switches automatically to the programming level and the display shows the required
data:
Temperatures and heating program
Weekday and time of day
Meter readings on the set day
Holiday period
Retrieval of standard values
Programming is made in 2 steps. First, the entry line is selected and then the respec-
tive value changed. Operating Instructions which explain all steps are located under the
cover. The programming level can be locked if these setting choices shall not be ac-
cessible.
Automatic operation
The heating program controls setpoint changeover. It can be temporarily over-
ridden by pressing the economy button. The overriding action then remains in
effect until the next heating program switching action occurs (refer to «Economy
button»).
Manual operation
The required room temperature is selected by pressing the economy button
(refer to “Economy button”).
Standby
The room temperature is maintained at a minimum level preselected either at the
central unit or the room unit.
Operating modes
2812Z11
AUTO
Each time the info button is pressed, the values
shown on the list below are displayed in successive
order. The selected display is maintained until the info
button is pressed again. Heating control continues to
operate independently of the selected display.
Info button
Time of day, room temperature
Weekday, time of day
Outside temperature*
%
Heat consumption trend
Meter reading of space heating (heat consumption)
Meter reading of DHW*
Meter reading of gas*
Meter reading of electricity*
Meter reading of other meters*
* These displays appear only if the respective signal sources are connected
Note
If several meters of the same type are used, a number appears in addition to the symbol.
2/8
Siemens Room unit QAW20 CE1N2812en
Building Technologies 13.08.2010
2


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