Danfoss Air w2 - User Manual

Other manuals for Danfoss Air w2

Installation Guide72 pages

Questions and Answers

D
davidburkeSep 7, 2025
What to do if the Danfoss Fan Air unit shows a fire alarm?
- T
  Tyler BrowningSep 7, 2025
  If the Air Dial remote control or one of the four temperature sensors in the Danfoss Air unit detects a temperature exceeding +70°C, a fire alarm will be triggered. Immediately check all rooms and leave the premises.
L
lisamorganAug 22, 2025
How to fix a filter error alarm on a Danfoss Air w2?
- A
  amy11Aug 22, 2025
  A filter error alarm on your Danfoss Fan indicates that the air filters are dirty. Replace the air filters following the instructions in chapter 3.1.
C
Cody FloresSep 4, 2025
What to do if Danfoss Air w2 Fan displays 'No connection via modbus' alarm?
- K
  Kimberly PatelSep 5, 2025
  If your Danfoss Fan displays a 'No connection via modbus' alarm, it indicates that the cable from the CCM module to the unit has been unplugged or is defective. Check the cable and reconnect it if necessary. If the cable is connected, but the error still occurs, contact your installer.
D
droySep 3, 2025
What to do if the Danfoss Air w2 Fan displays 'Room air too cold' alarm?
- M
  morantyroneSep 3, 2025
  If the Danfoss Fan displays a 'Room air too cold' alarm, it means the central heating system in the building is not supplying heat. Check if the heating system is functional. If the problem persists, contact the plumber/installer responsible for your heating system. After the heating system error has been resolved, shut down the ventilation system and switch the power on again to resume normal operation by disconnecting and reconnecting the power cable.
E
Eric ZimmermanSep 2, 2025
How to fix noise coming from Danfoss Air w2 air valves?
- J
  James WilsonSep 2, 2025
  Noise from the air valves in a Danfoss Fan system can be caused by airflow that is too high, excessive pressure over the valve, or the absence of a silencer on the main duct. In a correctly sized system, noise should not be a problem. Closing the air valves accidentally during cleaning can also cause a hissing noise, so avoid turning the valves when cleaning the ceiling.
P
patrickwalterAug 31, 2025
What causes negative pressure and doors binding with Danfoss Air w2 Fan?
- D
  Daniel HensleyAug 31, 2025
  Abnormally large negative pressure inside the house, causing doors to bind when using the Danfoss Fan, typically occurs when the discharge airflow is larger than the supply airflow. This can be due to incorrect balancing during system setup or extreme defrost conditions (at outdoor temperatures below -12°C). There should be a flow imbalance of 4-10% in favor of the discharge air. If you experience a permanent problem, contact the installer. If the problem only arises under extreme winter conditions, it is due to the integrated defrost controller reducing the supply air, which is an expected occurrence.
A
Adriana SpearsAug 30, 2025
Why is my house too hot with the Danfoss Fan running?
- B
  Brittany KennedyAug 30, 2025
  If your house is too hot while using the Danfoss Fan, it could be due to the thermostats being set too high or the bypass being disabled on the ventilation system. Turn down the thermostats and enable the bypass by going to Main menu > Bypass > Auto bypass.
R
Richard GomezAug 29, 2025
How to reduce noise from a Danfoss Air w2 unit?
- M
  Miss Mary ThompsonAug 29, 2025
  To reduce noise from your Danfoss Fan unit: * For a-type models, ensure the unit is mounted on a suitable platform according to the installation manual. * For w-type models, check that the rubber spacers are fitted at the rear of the unit and that the silicone strip was fitted onto the wall bracket. If you suspect a defective fan bearing is producing a grinding noise, contact your installer.
C
Christina HortonAug 27, 2025
How to stop condensation on window frames with a Danfoss Air w2 Fan?
- J
  Julia NguyenAug 27, 2025
  Condensation on window frames when using a Danfoss Fan indicates that the air exchange is too low to remove humidity, likely due to low surface temperatures on the window frame or glass and humid air. To resolve this, increase the fan step if in manual mode, or switch to demand mode or program mode. Alternatively, enable the Autoboost feature by navigating to Main menu > Settings > Boost > Autoboost on/off.
D
dana24Aug 27, 2025
Why does my Danfoss Air w2 Fan show 'No connection to CCM' alarm?
- D
  David RiveraAug 27, 2025
  A 'No connection to CCM' alarm on your Danfoss Fan typically means that communication between the Air Dial remote control and the CCM module has failed. This is often due to an obstacle near the CCM module, such as steel piping, steel objects, or insulation material clad with aluminum foil, or due to radio noise from other wireless appliances. If there is an obstacle, try to move it. If that's not possible, relocate the CCM module to a location with a clear line of sight. If other wireless appliances are causing the issue, try switching them off one by one to identify the faulty device. If these steps don't resolve the issue, contact your installer.

Summary

Main Functions

Away Mode

Command to reduce air volume to a minimum for prolonged absences.

Bypass Function

Cooling function opening a passage parallel to the heat exchanger.

Info Command

Displays present status of the unit, including temperatures and fan steps.

Boost Function

Increases air volume for specific situations like parties or cooking.

Operating Modes

Change ventilation control: Manual, Demand, or Program modes.

Menu Structure

Visual representation of the user interface navigation hierarchy.

System Settings

Customize system demands via default settings and weekly programs.

Maintenance

Filter Replacement

Step-by-step instructions for replacing air filters.

Unit Cleaning

Procedures for internal cleaning of the ventilation unit.

Air Dial Battery Replacement

Instructions for replacing batteries in the Air Dial remote control.

Options

Filter Options

Details on standard G4 and optional G4/F7 pollen filter sets.

PC System Control

Remote control and customization of the Danfoss Air system via PC.

Heating Surfaces

Information on electric preheating surfaces.

The Danfoss Air system is an advanced, efficient, and quiet ventilation system with heat recovery, designed to provide modern living conditions. It utilizes Z-Wave wireless technology for seamless control and offers various features to customize ventilation according to user needs. The system is Passive House certified by The Passive House Institute in Darmstadt, ensuring high energy efficiency and performance.

Function Description

The core function of the Danfoss Air system is to provide balanced ventilation with heat recovery. It continuously exchanges indoor air with fresh outdoor air while recovering heat from the exhaust air, minimizing energy loss. The system's operation is managed through the Danfoss Air Dial, a central control panel that allows users to adjust settings and monitor the system's status.

Main Functions:

Away Mode: This function is activated when users leave their house for an extended period. It reduces the air volume to an absolute minimum within a defined interval, conserving energy. If an optional heating surface is installed, it is turned off during Away mode for financial reasons.
Bypass Function (not available on w¹ units): This cooling function opens a passage parallel to the heat exchanger, stopping the heat exchange process and leading outdoor air directly into the house. It can be activated manually for a set duration (default 3 hours) or automatically when outdoor and room temperatures exceed selected levels. The bypass will not activate if the outdoor temperature is below +5°C.
Info Mode: Provides a comprehensive list of the unit's current status, including measured temperatures, fan steps, relative humidity, and other relevant information.
Boost Function: Designed for situations requiring higher air volume, such as parties, cooking with strong odors, or smoking. It is timer-based (default 3 hours, adjustable) and runs the unit at 100% speed. The maximum boost step can be adjusted in settings.
Autoboost: An automatic feature that increases airflow when sudden humidity arises (e.g., bathing or cooking). It remains active for one hour after activation before returning to the original airflow. Autoboost can be switched on or off in the settings.
Operating Modes: The system offers different operating modes to suit various preferences:
- Manual Mode: Maintains a constant air volume at a user-selected fan step (1 to 10). Automatic bypass and Autoboost functions can be switched off in this mode if not desired.
- Demand Mode: Utilizes a built-in humidity sensor to regulate air volume. It automatically reduces air volume at low outdoor temperatures to prevent excessive dryness indoors and increases air change when indoor humidity is high, adapting to seasonal changes.
- Program Mode: Allows selection of pre-defined family profiles that adjust ventilation rates based on occupancy patterns (higher during occupied periods, lower when empty) and activities like bathing or cooking. Users can also create custom profiles using a PC tool.
Night Cooling: An automatic bypass function for summertime use. It activates if it was a warm day, running from midnight until 6 am, allowing supply air to be +10°C or higher. It automatically stops if outdoor air is colder than +10°C or if extract air temperature drops below +18°C.
Time & Date: Allows adjustment of the system's time and date.
Restore Defaults: Resets all user settings to factory default values.

Heating Surfaces (Optional):

Electric Preheating Surface: Protects the system from icing at low outdoor temperatures by heating incoming air to -2°C. It ensures a permanent balance between supply and extraction air with 100% stepless adjustment for minimal power consumption. No user settings are required.
Electric Afterheating Surface: Ensures a minimum supply air temperature before air is blown into the room. It provides a small lift to the supply temperature, with 100% stepless adjustment for optimal power consumption. The required supply temperature can be set via the Air Dial.
Water-based Afterheating Surface: Similar to the electric afterheating surface, it ensures a minimum supply temperature. It uses a built-in motor valve for 100% stepless control. This can also be used as total heating in passive or 0-energy houses if dimensioned accordingly, allowing the user to set the required room temperature.
Geothermal Preheating/Cooling: Utilizes a buried ground pipe with 'anti-freeze' (brine) to preheat or precool outdoor air depending on the season. It automatically controls operation, preventing frost protection mode in winter and providing additional cooling in summer. When cooling, the system's bypass automatically opens.

Usage Features

The Danfoss Air system is designed for user-friendly operation, primarily through the Danfoss Air Dial.

Intuitive Control: The Air Dial allows users to control the entire system by rolling and pushing the dial, with all necessary information displayed on its screen.
Customizable Settings: Users can access a wide range of settings to tailor the system to their specific demands, including weekly programs, boost duration, and bypass conditions.
PC Control (Optional): The system can be controlled from a PC screen via Ethernet (standard for all Danfoss Air units). This allows for:
- Creating customized weekly programs with a user-friendly editor.
- Monitoring all temperatures and relative humidity in the house in a single screenshot.
- Viewing trend curves for the last 14 days, with hourly logging of all relevant sensors.
- Easy access to advanced settings with clear descriptions.
Wireless Technology: The use of Z-Wave wireless technology enables flexible placement of the Air Dial and seamless communication within the system.

Maintenance Features

The Danfoss Air system is designed for minimal maintenance, primarily focusing on filter replacement and periodic cleaning.

Filter Replacement:
- Filters should be replaced 1-2 times a year, depending on air volume and pollution levels.
- The unit provides an audible filter alarm and a message on the Air Dial display when filters need changing.
- To replace filters: remove the front panel (no tools needed), pull out old filters, fit new ones, reattach foam covers, and press the filter reset button.
- Standard G4 class filters are used for supply and discharge air. Optional F7 class pollen filters are available for allergy sufferers and should be fitted in the right filter slot for outdoor air filtration.
Air Dial Battery Replacement:
- The Air Dial indicates when batteries need replacement with an audible alarm.
- Lift the Air Dial off its wall bracket, remove old batteries, and insert 4 x AAA new batteries.
Unit Cleaning:
- The inside of the unit should be cleaned every other year.
- Procedure:
  1. Disconnect power and remove the front panel.
  2. Unscrew six screws holding three metal rails (using a torx key).
  3. Remove the front foam panel.
  4. Access internal parts.
  5. Pull the thick round seal over the heat exchanger sideways.
  6. Carefully lift/pull the heat exchanger out of the core.
  7. Clean the heat exchanger by pouring a mild soapy solution through its four open sides, letting it soak for 5-10 minutes, then rinsing under running water. Dry the exterior and gently slide it back into the unit.
  8. When remounting the exchanger, insert the round seal last, locking in the two ends first.
  9. Clean interior surfaces with a wet sponge or cloth and mild soapy solution. Do not use solvents on foam parts.
  10. Avoid spraying water onto the main circuit board. If water spills, tap it lightly with a dry cloth and allow to air dry for at least 24 hours before reconnecting power.
  11. Reassemble in reverse order: install foam front panel, secure with metal rails, tighten torx screws, and reinstall the front panel.