Dyson Purifier Big+Quiet Formaldehyde

Getting Started

The Dyson Purifier Big+Quiet Formaldehyde features a real-time LCD screen displaying indoor air quality. It is equipped with intelligent sensors that detect pollutants across a whole room, located on the side of the machine. The purifier includes a 360° HEPA filter and a pleated carbon filter wrapped around the central body. A selective catalytic oxidisation filter is also present, designed to never need replacing. Hidden wheels at the base allow for easy manoeuvrability on hard surfaces.

The MyDyson™ app is essential for users to get the most from their air purifier. It allows tracking of current and historical data, remote control from anywhere, setting schedules, and monitoring filter life. The curved remote control fits onto the front of the machine for easy access.

Assembling Your Machine

Your machine comes with a HEPA filter, carbon filter, and permanent catalytic filter already installed. Use both hands to lift the machine out of the box by its base.

Lift the conic amplifier out of the box and place it on the top of your machine. Rotate the conic amplifier until it clicks securely into place. A click indicates a secure lock.

Plug in the machine and press the power button on the screen or remote control to start.

Place the remote control on the front of your machine with the buttons facing down.

Diagram shows how to assemble the Dyson purifier's conic amplifier: position and twist until a click indicates a secure lock. Upward green arrows indicate direction to lift the conic amplifier off.

Diagram shows the location of the standby button and the remote control placement on the front of the machine.

Positioning Your Machine

Your machine is fitted with wheels for easy movement. Position your machine on a level floor.

For the most effective purification, position your machine on the edge of the room at least 1 metre from the wall, with the conic amplifier pointing to the furthest point, along the wall.

You can also position your machine facing diagonally across the room.

Diagram shows the purifier positioned on the edge of a room, with a blue arrow indicating the conic amplifier direction pointing along the wall.

Diagram shows the purifier positioned on the edge of a room, with a blue arrow indicating the conic amplifier direction pointing diagonally across the room.

Connecting to the MyDyson™ App

Take full control with the MyDyson™ app to access step-by-step setup and support. Monitor air quality with visual updates and automatically receive the latest software updates.

Download the MyDyson™ app from the App Store or Google Play. Open the app and follow the on-screen instructions to create a new account.

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[App Store] download button.

[Google Play] download button.

Available on Android™ stores button.

Connecting to Your Smart Home

Using Amazon Alexa: Ask Alexa to enable the Dyson skill to control your air purifier. Set routines to automate how your machine works with other devices in your home.

Using Google Assistant: Control all connected purifiers with Google or set routines to automate how your machine works with other devices. Just say "Hey Google" to get started.

Using Siri: Connect your Dyson machine to Siri Shortcuts to control it by voice on your Apple device.

[Amazon Alexa] integration logo.

[Google Assistant] integration logo.

Power On/Off

Press the Stand-by/off button on your Dyson air purifier or remote control to start/stop your machine. It will continue to monitor the air quality.

Diagram of the remote control, with the Stand-by button highlighted on the top left.

Continuous Monitoring

Continuous monitoring is turned off by default. Activate it to see your historic air quality (AQ) data. With continuous monitoring active, your Dyson air purifier gathers air quality and temperature information, displaying it on the LCD screen and in the MyDyson™ app.

To turn Continuous monitoring on or off using the remote control, press and hold the Auto mode button for five seconds. The LCD screen will indicate the Continuous monitoring status.

Wi-Fi connectivity is turned on by default. To turn Wi-Fi on or off, press and hold the Stand-by/off button on your machine for five seconds.

Diagram of the purifier, showing the LCD screen and indicating continuous monitoring status.

Information Menu

Press the information button to scroll through information monitored by your Dyson air purifier. Information about air quality, temperature, humidity, and filter levels is shown on the LCD screen. When a particular pollutant causes air quality to decrease, a symbol for that pollutant will show on the LCD screen.

Diagram of the remote control, with the information button highlighted on the right hand side.

Indoor air quality: Air quality graph shows the last 12 seconds of data.

Particulate matter (PM2.5): Microscopic particles up to 2.5 microns in size, suspended in the air. These include smoke, bacteria, and allergens. ? [PM2.5]

Particulate matter (PM10): Larger microscopic particles up to 10 microns in size, suspended in the air. These include dust, mould, and pollen. ? [PM10]

Volatile organic compounds: Potentially harmful odours found in cleaning products, paints, and furnishings. ? [VOCs]

Nitrogen dioxide and other oxidising gases: Potentially harmful gases released by combustion from cooking and vehicle exhaust emissions. ? [NOx]

Formaldehyde (HCHO): A common indoor pollutant released from furnishings, floorings, and glue. ? [HCHO]

Carbon dioxide (CO2): CO₂ can build up indoors without adequate ventilation, impacting cognitive function. ☁️ [CO2]

Indoor temperature: Monitor the ambient temperature of the room. ?️ [Temperature]

Indoor humidity: The amount of water vapour in the air, shown as a percentage. ? [Humidity]

Filters: Remaining filter life on LCD screen indicates when filters need replacing. ⏳ [Filter Life]

Wi-Fi: The current status of connection to the Wi-Fi network. ? [Wi-Fi Status]

Auto Purify

Set your air purifier to Auto mode. The on-board sensors will intelligently adjust the machine's settings according to air quality. The machine will pause when target air quality is reached, switching on again when levels drop. Airflow speed will increase to its maximum until target air quality is reached.

Diagram of the remote control, with the Auto mode button highlighted on the left hand side.

Set Airflow Speed and Direction

Increase or decrease airflow speed and change air direction from 0° to 50° using the remote or MyDyson™ app. Select Breeze mode by repeatedly pressing the airflow direction button until it activates, or use the MyDyson™ app.

Diagram of the remote control showing airflow speed toggle and direction buttons. Airflow angles of 0°, 25°, and 50° are indicated.

Night Mode and Sleep Timer

In Night mode, your Dyson air purifier continues to clean the air quietly at a lower airflow speed, with its LCD screen dimmed. Press the Night mode and Sleep timer button to scroll through the timer options.

Diagram of the remote control, showing the Night mode button on the bottom right and the Sleep timer button on the bottom left.

Changing Your HEPA Filter

The MyDyson™ app and LCD screen will alert you when filter life is low. Replacement filters are available at https://www.dyson.hk/en-HK.

Remove the conic amplifier: Slide the Release button on the back of the conic amplifier to unlock. Lift the conic amplifier off your machine. Lift the outer cover off the base of your machine.

Remove the filter: The HEPA filter is located in the outer cover. Press the filter release buttons on the inner rim and lift the outer cover off the filter. Dispose of the filter.

Install a new filter: Remove your replacement filter from packaging. Place the filter on the base of your machine. Place the outer cover over the filter and press down until it clicks securely. Place the conic amplifier on your machine and rotate until it clicks securely.

Plug in, switch on, and reset your filter life.

Sideways green arrow indicates the release switch to open the purifier for HEPA filter access. Upward green arrows indicate direction to lift the conic amplifier and outer cover off.

Zoomed-in green indicators highlight release buttons to remove the outer cover. A green upward arrow shows direction to lift the cover.

Reassembly: Place filter on base, then outer cover over filter. Position and twist conic amplifier until it clicks securely.

Reset Your HEPA Filter Life

It is important to reset the filter life after replacing your filter. Press and hold the Night mode button on the remote control. The LCD screen will count down from five, until a tick ✔️ appears. The filter life has been reset, and your machine is ready to use.

Pressing the night mode button on the bottom right of the remote control for 5 seconds.

Changing Your Carbon Filter

The MyDyson™ app and LCD screen will alert you when filter life is low. Replacement filters are available at https://www.dyson.hk/en-HK.

Remove the conic amplifier: Slide the Release button on the back of the conic amplifier to unlock. Lift the conic amplifier off your machine. Lift the outer cover off the base of your machine.

Remove the filter: The carbon filter is wrapped around the central body. Pull each of the four clips towards you to release the filter. Dispose of the filter.

Install a new filter: Remove your replacement filter from packaging. Wrap the filter around the base, fit clips in position, and push each one to secure. Place the outer cover and HEPA filter back on the base. Place the conic amplifier on your machine and rotate until it clicks securely.

Plug in, switch on, and reset your filter life.

Sideways green arrow indicates release switch to open purifier for carbon filter access. Upward green arrows indicate direction to lift conic amplifier, HEPA filter, and outer cover off.

User should pull each of the four clips towards them to release the filter. Green arrows indicate removal direction.

Position and twist the conic amplifier on to the machine; a click indicates a secure lock.

Place the outer cover and HEPA filter back in position on the base.

Wrap carbon filter around central body, using clips to secure. Green arrows indicate direction.

Reset Your Carbon Filter Life

It is important to reset your filter life after replacing your filter. Press and hold the down airflow direction button on the remote control. The LCD screen will count down from five, until a tick ✔️ appears. The filter life has been reset, and your machine is ready to use.

Holding down the airflow direction button on the right hand side of the remote control for 5 seconds.

Looking After Your Machine

To ensure optimal performance, regularly clean your Dyson air purifier and check for blockages.

Cleaning your machine: If your machine is dusty, wipe with a damp, lint-free cloth.

Check the sensor inlets on the left hand side of the conic amplifier for dust and debris. Look for dust and debris in the outer cover and in the conic amplifier. Use a soft brush to remove dust and debris. Do not use detergents or polishes.

Diagram shows cleaning the machine regularly with a damp, lint-free cloth.

Eye icons ? indicate areas where a user should regularly check for dust and debris in the outer cover and conic amplifier. Use a soft brush on highlighted areas to clean.