QAX850 is a master room unit for the RRV852 Duo-zone control system. This system allows you to control your heating and /
or cooling and to set your ideal temperature conditions within the two main areas of your home. The system is divided into the
main living area (Day zone) and the main night time area (Night zone). An Auto Timer mode with a 7-day programmable
schedule is provided. 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 a standby symbol
include extreme high / low temperature protection activation during
Setting actual time and day
button one time to set the time clock. (You will need to reset clock if there is a power loss of more than 20
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
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
System Off (Standby)
Day zone: System supplies air to the day zone
only and controls to the day zone temperature
Night zone: System supplies air to the night
zone only and controls to the night zone
Both Day/Night zone: System supplies air to
both the day and night zones and controls to the
Both zone temperature setpoint
Auto timer mode: System will change over
between Day zone and standby or Night zone
A1 ... A8
Auto fan speed
Low / Medium / High fan speed
– contact your supplier for further details.
QAX850 / RRV852
. Some systems will
button passing 11:59PM or
button passing 23:59 or press
button 2 times within 2 seconds.
Day symbol flashes.
button to set the current
to confirm. (
button to cycle through Day zone or
Night zone or both Day and Night zone or Auto
Do you want Day zone operation only?
button until display shows
Day zone temperature is maintained according
to the Day zone setpoint. A Heat
symbol will be displayed to indicate the
selected system mode.
Do you want Night zone operation only?
button until display shows
according to the Night zone setpoint. A Heat
symbol will be displayed to indicate
the selected system mode.
Do you want both Day and Night zones to
button until display shows both
symbol. Day and Night zone temperature is
maintained according to the Both zone setpoint
and the average actual temperature between
both zones. Heat
displayed to indicate the selected system mode.
symbol will be