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Siemens 

Master room unit QAX850 

 

CE1N2722en 

Building Technologies  

 

28.08.2007 

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 

Summary of Contents for QAX850

Page 1: ...n 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 ...

Page 2: ...nents 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 Ope...

Page 3: ...e 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 th...

Page 4: ...esistor 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...

Page 5: ... 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 condensi...

Page 6: ...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 u...

Page 7: ... room unit QAX850 CE1N2722en Building Technologies 28 08 2007 Dimensions Room unit 96 119 23 8 3031M01 Base 89 45 4 3031M02 28 28 28 28 26 30 35 30 11 8 112 3 4 Dimensions in mm 2005 Siemens Switzerland Ltd HVAC Products ...

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