Siemens QAX850 User manual

CE1N2722en
28.08.2007
Building Technologies
HVAC Products
2722
Master room unit QAX850
for RRV… controllers
Multifunctional, digital room unit for installer and end-user interface with RRV…
controllers.
2 wire bus connection
Use
Room unit in combination with an RRV… controller for HVAC plants in:
•Residential apartments
•Residential single house
•Autonomous light commercial applications
For use with RRV… controllers in air based plants including heating, cooling and
ventilation (HVAC) equipment. Suitable for Standard, Duo-zone, Duo-switch and Multi-
zone applications.
Functions
•Remote control and monitoring of an RRV… controller
•Parameter adjustments by installer
•Room temperature measurement
•Time clock operation
•Comfort temperature setpoint adjustment
•Energy saving temperature setpoints adjustment
•Auto timer selection
•Fan speed selection
•Zone selection and settings (only for RRV controllers with zone outputs)
•Display of operating mode, temperature, time, fan speed and zone values.
Use
A
pplication
Primary functions
Operator functions

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Siemens Master room unit QAX850 CE1N2722en
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Type summary
Type reference Description Compatible with*
QAX850 Master room unit •Temperature controller RRV851
•Temperature controller RRV852
•Temperature controller RRV856
•Zone room unit QAW850
* Not usable with Desigo RX range of controllers
Product documentation
Document Document number
Data sheet N2722
Mounting instructions M2721
Operating instructions for use with RRV81 B2725en01
Operating instructions for use with RRV82 B2726en01
Operating instructions for use with RRV82 (duo-switch) B2726en03
Operating instructions for use with RRV86 B2727en01
Declaration of conformity T2722
Mechanical design
The QAX850 is the installer/OEM/end-user master MMI for RRV controllers.
The unit consists of the following components:
•Room unit with integrated electronics and operating elements
•Internal temperature sensor
•Base for wall mounting with the connection terminals
•Operator interface buttons (high use)
•Operator interface buttons behind door (low use)
2722P01
1
2
3
4
5
6
7
8
9
10
11
1 LED for heat/cool output status
2 LCD display with EL backlight for control and monitoring of modes,
setpoints, zone conditions etc
3 Operating mode selection – Comfort, energy saving and auto timer
(RRV852 Day/Night zone selection for Duo-zone application)
4 Temporary setpoint and value increase/decrease
5 System off and fan speed control
6 Heat, cool, heat/cool changeover and ventilation only selection
7 Time and weekday setting
8 Auto timer schedule setting
9 Zone output selection (RRV856 and RRV852 for Duo-switch application)
10 Permanent comfort and energy saving setpoints (Day/Night/Both setpoints
for RRV852 Duo-zone application)
11 Button for confirming values and scrolling through parameter sets
Components
Operating elements

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Siemens Master room unit QAX850 CE1N2722en
Building Technologies 28.08.2007
2
3
5
6
7
8
9
10 11
12
13
14
4
1
2722Z01
1 Day indication
2 Actual temperature
3 Fahrenheit/Celsius
4 Zone indication (RRV856 and RRV852 for Duo-switch application)
5 AM/PM indication
6 Time display
7 System off
8 Comfort mode (Day zone in Duo-zone application)
9 Energy saving mode (Night zone in Duo-zone application)
10 Auto timer mode
11 Heating mode
12 Cooling mode
13 Fan speed indication (low, medium and high)
14 Auto fan mode
Commissioning notes
When powering up, the QAX850 will display all LCD icons for approximately 3 seconds
and then the software version number for another 3 seconds. It will then revert to
normal display. The time segments will be blinking if time needs to be set. Set time as
per Operation Instructions. There will be a delay before operation commences due to
polling of all values.
Generally there is no need to calibrate sensor; however the displayed room
temperature on the LCD can be calibrated if there is any discrepancy from the actual
temperature measured with a certified thermometer. Calibration function can be
accessed by pressing the and buttons simultaneously for 5 seconds. Displayed
value can then be adjusted via the same buttons in 0.1K steps. Range is ±3 K.
Initial application set-up of RRV controller to match the connected HVAC equipment is
made by the selection of dip switch positions. Dip switches are located on the top of the
RRV controller. Further settings can be made via the QAX850 by modifying parameters
as per list below. Default values are dependant on application selected and RRV
controller model. Refer to Installation Instructions for set-up details and application
sheets for default parameter values.
To access parameters press the and buttons simultaneously for 3 seconds, then
within 2 seconds press the button for 3 seconds and release. Parameters cannot be
accessed if system is in off mode.
No. Parameter Range
P00 Temperature scale °C/F°
P01 Frost protection limit in OFF mode Off/5…8 °C
P02 Over-temperature limit in OFF mode Off/30…35 °C
P03 Min. OFF time delay 0…600 s
P04 Min. ON time delay 0…600 s
P05 Dead band between cool and heat OFF points 0.5…6 K
LCD display
Response on start-up
Sensor calibration
Commissioning
Set-up parameters

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No. Parameter Range
P06 RV ON in heat or cool mode Heat/Cool
P07 Fan run ON after heat output turns Off 0…300 s
P08 Fan run ON after cool output turns Off 0…300 s
P09 FCU flush pipe time 120…600 s
P10 Zone Heat / Cool Inhibit Heat/Cool/No
P11 Water temp. heat mode changeover 22…32 °C
P12 Water temp. cool mode changeover 10…21 °C
P13 Fan auto-speed high range H:80…100 %
P14 Fan auto-speed medium range M:30…75 %
P15 Fan auto-speed low range L:1…15 %
P16 Window contact NO/NC
P17 2-p or 3-p control selection 2-p/3-p
P18 P-band in heat mode /Switching differential 0.5…10 K
P19 P-band in cool mode /Switching differential 0.5…10 K
P20 Integration time 0…60.0 min in
0.5 min steps
P21 3-p valve actuator running time 50…300 s
P22 Zone capacity weight None
Small
Medium
Large
P23 Ventilation in dead zone Off, H/C, C only
QAX850 internal sensor can be replaced by connecting an external NTC resistor
sensor (QAA32 or QAH11) to the RRV controller B1 input. In this case the QAX850
automatically recognizes and displays the external sensor value.
Mounting and installation notes
The QAX850 should be mounted in a location where the air temperature can be
measured as accurately as possible without getting adversely affected by direct solar
radiation or other heating or cooling sources. There is no need to consider air
temperature conditions if external sensor is connected to the RRV controller. In this
case the QAX850 would serve as a master control unit only.
•Mounting height is about 1.5 m above the floor.
•QAX850 must not be located in the direct path of air conditioning air flow.
•The unit can be fitted to a recessed conduit box.
•The specified ambient conditions must be complied with.
•Only authorized staff may disconnect the QAX850 unit from base plate.
•Do not mount in recesses, shelves, behind curtains or doors.
•Refer to Mounting Instructions M2721 included in packaging box.
When mounting the unit, fix the base-plate first and then make the electrical
connections. To avoid any damage during construction works only install QAX850 unit
Internal sensor

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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 mm2
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

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Siemens Master room unit QAX850 CE1N2722en
Building Technologies 28.08.2007
Electromagnetic compatibility
Immunity domestic section, light industry
Emissions domestic section, light industry
EN 61 000-6-1
EN 61 000-6-3
-conformity
EMC directive
Low-voltage directive
89/336/EEC
73/23/EEC
N474 conformity to
Australian EMC framework
Radio interference emission Standard
Radio Communication Act 1992
AS/NZS 4251.1
Measuring range 0…49 °C
Room temperature
measurement Setpoint range 5…35 °C
Accuracy at 20 °C max. ±0.5 K
Temperature calibration range max. ±3.0 K in increments of 0.5 K
Room temperature display resolution 0.5 K
Weight Excluding packaging approx. 0.1 kg
Notes
•The products may only be used in building services plant and applications as
described above.
•When using the products, all requirements specified under ”Technical data” must be
observed.
•Local regulations for electrical installations must be complied with.
Connection diagram
N1 A1
HB+
HB-
HB+
HB-
2723A01
A1 QAX850 master room unit
N2 RRV… controller
Product liability

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Siemens Master room unit QAX850 CE1N2722en
Building Technologies 28.08.2007
Dimensions
Room unit
96
119
23,8
3031M01
Base
89,45
4
3031M02
28 28
2828
26 30
3530
11,8
112,3
4
Dimensions in mm
©2005 Siemens Switzerland Ltd
HVAC Products