Cleaning the fans
Check the condition of the fans in connection with filter replacement and HR cell maintenance. Clean the fans if necessary.
You can clean the fan blades with compressed air (wear protective goggles) or by brushing them gently. Do not remove or move the balance blocks on the fan blades.
To clean the fan:
- Disconnect the ventilation unit from the mains electricity supply.
- Remove the door cover panel. Undo the unit’s mounting screws (4 mm hexagon).
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Lift the door off.
CAUTION:The door is heavy.
- Remove the filters and the heat recovery cell. See sections Replacing the filters and Cleaning the heat recovery cell.
- Remove the support plate (F) by undoing the screws (E).
- Detach the bypass module (G) cable from the connector (found in front of the extract air fan (in front of P)). Pull the bypass module (G) out of the unit.
- Remove the plastic nuts used to fasten the fans (J) (2 per fan). Remove the two wing screws (I) (2 pcs) of the additional heating resistor (H) (only when changing the supply air fan) and remove the cable of the resistor (H) from the connector.
- 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).
- You can now clean the fan. Put the control grille (R) back in place after cleaning.
- Reassemble in reverse order after cleaning. After reassembling the fan, ensure that the rubber feedthrough (M) is in place.
- Close the door. Ensure that the safety switch catch of the door is touching the safety switch (S). Tighten the door tightening screws only to the extent that the outdoor damper of the door comes into contact with the frame of the unit. The outdoor damper of the door must not be pressed in around the screws.
- Plug the ventilation unit back into the mains.
Remember to reattach the damper actuator bar to the damper pivot and secure it with the orange magnet. Make sure the sensors and their feedthrough rubbers are in place. Check also that the connections have been made correctly and the earthing screw is in place in the left corner.
The anemometer in the fan must be cleaned at least every three (3) years. It is recommended to use compressed air for the cleaning. It is best not to remove the fan’s anemometer.
