Siemens QAX850 Operating Instructions

Operating instructions
QAX850 is a master room unit for the RRV852 standard control system. This system allows you to control your heating and /
or cooling and to set your ideal temperature conditions. The system provides Comfort, Energy Saving and Auto Timer mode
with a 7-day programmable schedule. Factory settings are already set however you can adjust these to suit your personal
needs.
System On and Fan Speed control
Press to turn system on or off and to select fan speeds - Low / Medium / High / Auto Fan and System Off. If your
/
system is single speed fan only, then simply press to turn system on or off.
When powering up, the QAX850 will display all LCD symbols. It will then revert to normal display. The time
segments will be flashing if time needs to be set.
The system off mode turns the whole system off and is indicated by the standby symbol
include extreme high / low temperature protection activation during
Setting actual time and day
Press button one time to set the time clock. (You will need to reset clock if there is a power loss of more than
20 minutes.)
Press or button to set the current time and then press
If current time is 12-hour format and you wish to change to 24-hour format, press
press button passing 12:00AM.
If current time is 24-hour format and you wish to change to 12-hour format, press
button passing 00:00.
Building Technologies / HVAC Products
QAX850 / RRV852 + Duo-switch function
System Off
Comfort mode: System operates to maintain
comfortable room temperature
Energy saving mode: System operates only
when actual temperature reaches energy saving
setpoints
Auto timer mode: System will switch from
comfort mode to energy saving according to
program settings
Heating
Cooling
A1 ... A8 Time program
AUTO Auto fan speed
Low / Medium / High fan speed
1 ... 7 Weekday indication
Apparatus indication
Z1 Z2
– contact your supplier for further details.
to confirm..
CE1B2726en03
B2726.03
. Some systems will
button passing 11:59PM or
button passing 23:59 or press
Press button 2 times within 2 seconds.
Weekday
Day symbol flashes.
1 7
..
Press or button to set the current
weekday.
Press to confirm. (
7
through = Sunday).
Operation modes
Press button to cycle through Comfort
or Energy Saving or Auto Timer
Do you wish to change to Comfort mode?
Press button until display shows
symbol. Room temperature is maintained
according to Comfort setpoint and actual
room temperature. A Heat
symbol will be displayed to indicate the
selected system mode.
Do you wish to change to Energy Saving mode?
Press button until display shows
symbol. This is typically the mode for night
time or unoccupied periods where you
require internal temperature not to drift to an
extreme level. A Heat
will be displayed to indicate the selected
system mode.
Do you wish to change to Auto Timer mode?
Press button until display shows
symbol. The system
change over between Comfort and Energy
Saving mode according to 8 pre-programmed
timers.
29.08.2008
1
= Monday
mode.
or Cool
or Cool symbol
will automatically
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