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2812Z03
0 4 8 12 16 20 24
The QAW20 features an LCD showing
all relevant information in every situa-
tion.
Displa
y
°C
2812Z12
With the setting knob, the nominal room temperature setpoint can be read-
justed by ±3 °C. Any readjustment is added to the programmed nominal set-
point while the reduced setpoint remains unchanged.
S
etpoint readjustment
2811X06
The economy button permits changeover from the nominal to the reduced
room temperature, or vice versa. The action of the economy button in auto-
matic and manual operation is as follows:
In manual operation, the selected setpoint is maintained until the but-
ton is pressed again.
0
4
812
16
20 24 h
2812Z17
Action of economy button in
manual operation
In automatic operation, the actual setpoint is temporarily overridden
when pressing the button. The next time the heating program per-
forms a switching action, the controller will resume the programmed
heating operation.
0
4
812
16
20 24 h
2812Z18
Action of economy button in
automatic operation
E
conomy button
Setpoints The temperature of the reference room is controlled to t
he selected setpoint. There is a
choice of two temperature settings. Changeover is accomplished either by the time
program or the economy button.
Nominal room temperature
Reduced room temperature
Setpoint generation The nominal and the reduced setpoint are selected on the programming level. In the
case of the nominal setpoint, the readjustment made with the knob on the unit is added
to the basic setting.
There are two choices:
Setpoint limitation
Central limitation via the OZW30 central unit
Locally by limiting the angular rotation of the knob by means of pins at the rear of the
room unit
7-day clock
The time of day and weekday are set on the programming level of the unit:
Display of time of day from 00.00 to 23.59 hrs
Display of weekday from 1 through 7
If an OZW30 central unit is installed, the clock of the QAW20… is synchronized by the
that unit. In that case, setting of synchronization on the room unit is not possible.
Clock synchronization
3/8
Siemens Room unit QAW20 CE1N2812en
Building Technologies 13.08.2010
3


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