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Siemens
QAX34.3 – Room unit with PPS2 interface
CM2N1640en_04
Building Technologies
30 Jun 2009
Operating data
Temperature sensor
Measuring element
NTC resistance sensor
Measuring range
0 ... 40 °C
Response
time
10 min
Measuring accuracy (5 … 30 °C)
1.0 K
Measuring accuracy (25 °C)
0.5 K
Setpoint
correction
Correction range (defined by controller)
Max.
10 K (basic setting
3 K)
Accuracy over full correction range
10 %
Display Type
LCD
Functions displayed
– Room temperature
– Setpoint adjustment
– Operating mode ( / Auto)
– Manually selected fan speed
– Control sequence
– Type of error
– RXB/RXL parameter setting
Ports/interfaces
Type of port between controller and room unit
PPS2 (point-to-point interface, V 2)
Signal voltage, logic 0
< 5 V
Signal voltage, logic 1
> 7 V
Baud
rate
4.8
kbps
Cable connections
Connection terminals (screw terminals)
Solid or stranded conductors
0.8 … 2.5 mm
2
Single cable length between controller
and room unit
See installation guides:
DESIGO RXC: CA110334,
DESIGO RXB & RXL: CM110381
DESIGO RXA: CA2Z3884
DESIGO PX: CA110396
Cable
type
2-core, twisted pair, unscreened
Housing protection
Protection standard to EN 60529
IP 30
Protection class
Insulation protection class
III
Ambient conditions
IEC 721
Normal operation Transport
Environmental conditions
Class 3K5
Class 2K3
Temperature
0 ... 50 °C
– 25 ... 70 °C
Humidity
< 85 % rh
< 95 % rh
Mechanical conditions
Class 3M2
Class 2M2
Standards and directives Product standard Automatic electronic controls for
household and similar use
EN 60730-1
Electromagnetic
compatibility
Immunity (industrial & domestic)
EN 60730-1
Emissions
(domestic)
EN 60730-1
compliance
Meets requirements of EMC directive
2004/108/EC
C-Tick conformity (EMC)
AS/NZS 61000-6-3
Environmental
compatibility
The product environmental declaration
CE1E1640 contains data on RoHS compliance,
materials composition, packaging, environmen-
tal benefit, disposal
ISO 14001 (Environment)
ISO 9001 (Quality)
2002/95/EC (RoHS)
Dimensions See
“Dimensions”
Color Front
plate
NCS S 0502-G
RAL 9003 signal white
Housing base, mounting plate and bias switches
RAL 7035 (light gray)
Weight Excluding
packaging
0.119
kg