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The mounting location should be chosen such that the sensor will acquire the room
temperature as accurately as possible, with no influence from direct solar radiation or
other heating or cooling sources.
In the reference room where the QAW20… is mounted, there should be no radiators
with thermostatic radiator valves. If there are, they must be set to their fully open posi-
tion.
Programmable input
The connection terminals are suitable for the following cross-sectional areas:
Stranded wire or solid wire 0.25…2.5 mm
2
Stranded wire with ferrule max. 2 × 1.5 mm
2
Installation notes
The room unit can be fitted to most commercially available conduit boxes or directly on
the wall. When mounting on the wall, the cable can be introduced either from the top or
the bottom through knockout holes.
For the electrical installation, the local regulations and standards must be observed.
The wires must be laid based on the regulations for safety extra low-voltage (SELV) to
EN 60730.
First, the base is fitted and wired up. Then, the unit is placed on the lower part of the
base and swung upward. Adhesive labels (e.g. the connection diagram) can be fitted
on the side of the housing.
Commissioning notes
When power is supplied to the unit, the display shows all the information relating to the
current state.
The setpoint readjustment range can be limited with the help of pins at the rear of the
unit.
Finally, the heating engineer needs to make the required settings on the service level
and at the WRI80 or WRV… and OZW30.
Technical data
General unit d
ata
Operating voltage
max. perm. voltage
SELV / PELV DC 10…15 V
AC 24 V
Rated voltage
DC 15 V
Perm. Ambient temperature
Transport a storage
Operation
–25…+65 °C
0…55 °C
Perm. Ambient humidity
Transport and storage
Operation
class E DIN40040
class G DIN40040
NTC temperature sensor
Time constant
Thermal coupling to the wall
10 min.
50 %
Measuring range room temperature 0…32 °C
Setting ranges
Normal setpoint
Economy setpoint
Setpoint readjustment range
Resolution
3…29 °C
3…29 °C
±3 °C
0.5 °C
6/8
Siemens Room unit QAW20 CE1N2812en
Building Technologies 13.08.2010
6


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