Cleaning the fans

Check the cleanliness of the fans when servicing the filters and the heat recovery cell. Clean the fans as required.

You can clean the fan blades with compressed air (wear protective goggles) or by brushing them gently. Do not remove or move the fan blade balancing weights.

To clean the fan:

  1. Disconnect the ventilation unit from the mains electricity supply.
  2. Lift off the door cover panel. Undo the unit’s mounting screws (4 mm hexagon).
  3. Lift the door off.
    CAUTION: The door is heavy.
  4. Remove the filters and the heat recovery cell. See chapters “Replacing the filters” and “Cleaning the heat recovery cell”.
  5. Remove the support plate (F) by undoing the screws (E).
  6. Detach the bypass module (G) cable from the connector (found in front of the extract fan (P)). Pull the bypass module (G) out of the unit.
  7. Remove the plastic nuts used to fasten the fans (J) (2 per fan). Remove the two wing screws (I) of the post-heating resistor (H) (only when changing the supply air fan) and remove the cable of the resistor (H) from the connector.
  8. Remove the fan from the unit by lowering it before turning the fan anti-clockwise, whilst tilting it. Remove the control grille by undoing the screws (4 pcs).
  9. You can now clean the fan. Put the control grille (S) back in place after cleaning.
  10. Reassemble in reverse order after cleaning. After reassembling the fan, ensure that the rubber feedthrough (M) is in place.
  11. Close the door. Ensure that the safety switch catch of the door is touching the safety switch.
  12. Plug the ventilation unit back into the mains. The fan has now been checked and cleaned.