Siemens RRV852 Operating Instructions Manual
Building Technologies / HVAC Products CE1B2726en03 29.08.2008 1/2
B2726.03
Operating instructions QAX850 / RRV852 + Duo-switch function
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 . Some systems will
include extreme high / low temperature protection activation during – contact your supplier for further details.
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 to confirm..
If current time is 12-hour format and you wish to change to 24-hour format, press
button passing 11:59PM or
press
button passing 12:00AM.
If current time is 24-hour format and you wish to change to 12-hour format, press button passing 23:59 or press
button passing 00:00.
Press
button 2 times within 2 seconds.
Day symbol flashes.
Press or button to set the current
weekday.
Press
to confirm. (1 = Monday
through
7
= Sunday).
Operation modes
Press button to cycle through Comfort
or Energy Saving or Auto Timer mode.
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 or Cool
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 or Cool symbol
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 will automatically
change over between Comfort and Energy
Saving mode according to 8 pre-programmed
timers.
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
Z1 Z2
Apparatus indication
/
Weekday
1
..
7
2/2 29.08.2008 CE1 B2726en03 Building Technologies / HVAC Products
Do you want to change the temperature
setpoints of Comfort / Energy Saving mode?
Press , the symbol and setpoint value is
flashing indicating Comfort mode setpoint
change expected.
Press or button to change this setpoint in
steps of 0.5°C.
Press to confirm and continue to the
Energy Saving mode heating setpoint.
The and symbol and setpoint value is
flashing indicating Energy Saving mode heating
setpoint change is expected; press or
button to change this setpoint in steps of 0.5°C.
Press to confirm and continue to the
Energy Saving mode Cooling setpoint.
The and symbol and setpoint value is
flashing indicating Energy Saving mode cooling
setpoint change is expected, press or
button to change this setpoint in steps of 0.5°C.
Press to save the change.
Note: If no button is pressed after 5 seconds, setpoint setting
changes will be saved and operational mode will resume.
During Comfort mode operation are you too
warm / too cold?
You can temporarily adjust the temperature
setpoint when in Comfort mode. Press or
button to adjust the temperature setpoint. You
can increase or decrease the room temperature
setpoint in steps of 0.5°C. The maximum range is
from 5°C to 35°C, however it is recommended to
not exceed 18°C to 26°C range. Setpoints will
revert back to permanent setpoint settings after
any mode change.
Do you want to view and set the Programmable
Timer setting?
Press button once to sequentially review the
8 auto timers.
To adjust the time schedule, hold for 3 seconds to
go into Programmable Timer Setting mode.
Auto timer 1 shows, A1 and
symbol displays
with time xx:xx flashing to indicate timer setting
change is expected for the Comfort mode.
Press or buttons to adjust the Comfort mode
start time.
Press
button to set the days applicable to the
timer. The
1
symbol will flash. Press or
button to select or deselect each day and advance
to the next day.
Press to save the changes for the Comfort
mode start time and advance to set the Energy
Saving mode start time.
The
and symbol displays with the time xx:xx
flashing. Press or button to adjust the time.
To cancel the timer, press
button until time
schedule changes to --:--.
Press to save the Energy Saving mode
changes and advance to Auto timer 2.
Repeat the procedure for setting Timer A1 and
advance to next timer.
System will return to normal operational mode if
no button is pressed within 20 seconds. All
modifications made after last Time Schedule and
button pressed will not be saved.
What is the green LED for?
The green LED indicates when heating or cooling energy is
activated.
Do you want just heating?
Press button until display shows symbol only.
The system is restricted to heat. The symbol
will not appear if your air conditioning equipment
provides cooling only.
Do you want just cooling?
Press button until display shows symbol
only. The system is restricted to cool. The
symbol will not appear if your air conditioning
equipment provides heating only.
Do you want auto-changeover of heat / cool?
Press button until display shows both and
symbols. This indicates the system will activate
heating or cooling in order to maintain desired
temperature setpoint. This applies to heating /
cooling air conditioning equipment only.
Do you want ventilation fan only?
Press button until the and symbols are not
displayed. No heating or cooling will be provided only ventilation.
Optional apparatus control
Press Z button to operate up to 2 apparatuses
which are indicated by either Z1 or Z2 symbol.
Once you select an apparatus, press
button to turn it on or off.
Both will turn off during System Off mode
and return to their previously selected positions
after resuming comfort, energy saving or auto
timer mode.
Note: The optional apparatus operates independently of
temperature comfort operation. Contact your supplier for
further details.
Energy saving tips without sacrificing comfort
Never allow room temperatures to exceed 21°C when
heating or fall below 22°C when cooling.
Select Energy Saving mode even when you are absent for
short periods of time and select System Off mode when
absent for extended periods.
Although auto-changeover of heat / cool is possible, it is
recommended you select cool mode only in summer and
heat mode only in winter.
Note: This document provides user instructions only. For
more detailed technician information please refer to
RRV852 installation / commissioning guide.
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