6/8
Siemens
QAX34.1 – Room unit with PPS2 interface
CA2N1645en_02
Building Technologies
30 Jun 2009
Technical data
Supply voltage
Operating voltage range
SELV / PELV DC 12 ... 15 V
The room unit receives its power from the connected controller, via the PPS2 interface
Power consumption (from controller)
Max. 0.10 VA
Function data
Temperature sensor
Measuring element
NTC resistor
Measuring range
0 ... 40 °C
Response
time
8 min
Accuracy (5 ... 30 °C)
0.5 K
Accuracy
(25
°C)
0.25 K
Setpoint
correction
Correction range (determined by controller) max.
10 K (default
3 K)
Accuracy over full correction range
10 %
Display Type
LCD
Functions displayed
– Room temperature
– Setpoint adjustment
– Control mode
– Manually selected fan-speed
– Control sequence
– Error code
Interfaces
Type of interface between controller and
room unit
PPS2
(point-to-point interface, Version 2)
Baud rate
4.8 kbit/s
Cable connections
Connection terminals (screw terminals)
Stranded or solid conductors
0.8 ... 2.5 mm
2
Single cable length controller – Room unit
See Installation guidelines:
DESIGO RXC: CA110334,
DESIGO RXB & RXL: CM110381
DESIGO RXA: CA2Z3884
DESIGO PX: CA110396
Cable type
2-core or 4-core, twisted pairs,
unscreened
Connecting cable for service tool
Off-the-shelf, max. 3 m
Housing protection standard Protection standard to EN 60529
IP 30
Protection class
Insulation protection class
III
Ambient conditions
IEC 721
Operation
Transport
Ambient air 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
UL
compliance
UL916
C-Tick conformity (EMC)
AS/NZS 61000-6-3
Environmental
compatibility The product environmental declaration
CA2E1645 contains data on RoHS compli-
ance, materials composition, packaging, envi-
ronmental benefit, disposal
ISO 14001 (Environment)
ISO 9001 (Quality)
2002/95/EC (RoHS)
Dimensions See
“Dimensions”
Color Housing
front
NCS
S
0502-G,
RAL 9003 signal white
Housing, base unit, rocker switches
RAL 7035 light grey
Weight Excluding
packaging
0.12
kg
