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Siemens
Master room unit QAX850
CE1N2722en
Building Technologies
28.08.2007
when all construction works have been completed. The QAX850 must be mounted on a
flat surface and in compliance with local regulations.
Local installation regulations must be observed.
The room unit is not protected against connection to AC 230 V!
Technical data
Interfaces (S+, SG)
HCC bus
proprietary protocol
Bus power supply voltage
DC 12 V, +10, –15% (supply
RRV85x controller)
Baud rate
9.6 kbit/s
Room
unit power consumption
2 VA
Permissible cable lengths
For bus communication
A
≥
0.5 mm²
A
≥
1 mm²
max. 60 m
max. 100 m
Type of cable
2-wire standard installation cable
(unshielded)
Note:
Twisted pair (unshielded) is recommended for enhanced
immunity to external electromagnetic interference, e.g. in the
vicinity of radio transmitters or variable speed drives
Electrical connections
(HB+, HB–)
Connection terminals
For wires
screw terminals
0.6 mm dia. … 2.5 mm
2
Degrees of protection
Degree of protection of housing to IEC 60 529
IP 30
Safety class to EN 60 730
device suited for use with equipment
of safety class II
Environmental conditions
Operation to
Climate conditions
Temperature (housing and electronics)
Humidity
Mechanical conditions
IEC 721-3-3
class 3K5
0…50 °C
5…95 % r. h. (non-condensing)
class 3M2
Transport to
Climate conditions
Temperature
Humidity
Mechanical condition
IEC 721-3-2
class 2K3
–25…+70 °C
<95 % r. h.
class 2M2
Classification to EN 60 730
Mode of operation, automatic controls
type 1B
Degree of contamination, controls Environment
2
Rated surge voltage
4000 V
Software class
A
Materials and colors
Top housing
Polycarbonate, RAL 9003 (signal-
white)
Bottom housing and base plate
Polycarbonate, RAL 7035 (lightgrey)
Packaging corrugated
cardboard
Norms and standards
Product safety
Automatic electrical controls for household and
similar use
Special requirements for temperature sensing
controls
EN 60 730-1
EN 60 730-2-9
STOP
Note
