User Manual

ManualsBrandsSiemens ManualsOperator unitsMaster room unit for the RRV851 standard control system QAX850

Building Technologies / HVAC Products CE1B2725en01 29.08.2008 1/2

B2725.01

Operating instructions QAX850 / RRV851

QAX850 is a master room unit for the RRV851 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 a 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. (

= Monday

through

= 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

Weekday indication

Weekday

Summary of content (2 pages)

PAGE 1
B2725.01 Operating instructions QAX850 / RRV851 QAX850 is a master room unit for the RRV851 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. A1.. A8 AUTO 1 ..
PAGE 2
Do you want to change the temperature setpoints of Comfort / Energy Saving mode? Do you want to view and set the Programmable Timer setting? 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. to confirm and continue to the Press Energy Saving mode heating setpoint.