Siemens QAW850 User manual

Building Technologies / HVAC Products CE1B2726en02 29.08.2008 1/2

B2726.02

Operating instructions QAW850 / RRV852

The QAW850 is the optional Night zone control 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. Refer to QAX850/RRV852 Duo-zone operation instructions for master control unit

details.––

Standby Press this button during Night zone operation to turn system off. System off will be indicated by the standby

symbol . You can also turn Night zone operation on by this standby button.

Some systems will include extreme high / low temperature protection activation during – contact your supplier

for further details.

Operation modes

Press button to select operation of Day zone or Night zone or Both zone or Auto Timer mode.

Do you want Day zone operation only?

Press button until display shows symbol.

Day zone temperature is maintained according

to the Day zone setpoint. A Heat or Cool

symbol will be displayed to indicate the

selected system mode.

Do you want Night zone operation only?

Press button until display shows symbol.

Night zone temperature is maintained

according to the Night zone setpoint. A Heat

or Cool symbol will be displayed to indicate

the selected system mode.

Do you want both Day and Night zones to

operate together?

Press 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 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 Day and standby or Night zone and

standby according to 8 pre-programmed timers.

Note: Program schedule of auto timer is set via

the QAX850 master room unit.

System Off (Standby)

Day zone: System supplies air to the day zone

only and controls to the day zone temperature

setpoint

Night zone: System supplies air to the night

zone only and controls to the night zone

temperature setpoint

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

and standby

Heating

Cooling

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Siemens

Switzerland

Ltd

Subject to alter

tion

Do you want to change the Night zone

temperature setpoint?

The permanent night, day and Both zone setpoints can be

set on the QAX850. Refer to QAX850/RRV852 user

instructions.

During Night or Both zone operation are you too

warm / too cold?

You can temporarily adjust the temperature

setpoint when in Night zone or Both zone

operation. 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.

If you constantly need to adjust the temperature

setpoint via the QAW850, it is recommended that

you re-adjust the permanent setpoints of Night

zone or Both zone on the QAX850 master

room unit.

What is the green LED for?

The green LED indicates when heating or cooling energy is

activated.

Energy saving tips without sacrificing comfort

Never allow room temperatures to exceed 21°C when

heating or fall below 22°C when cooling.

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 for the

QAW850 only. For more detailed technician information on

the Duo-zone system please refer to RRV852 installation /

commissioning guide.

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