4/7
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
