44MAINTENANCE CLEANING THE FANS (INSTALLER)Check the cleanliness of the fans when servicing the filters and the heatrecovery cell. Clean the fans as required.You can clean the fan blades with compressed air (wear protectivegoggles) or by brushing them gently. Do not remove or move the fanblade balancing weights.To clean the fan:1. Disconnect the ventilation unit from the mains electricity supply.2. Open door of the Vallox ventilation unit by undoing the finger screws.3. Lift the door off.CAUTIONThe door is heavy.4. Remove the extract air filter (C), the sealing strip (E) and the heatrecovery cell (D). See chapters “Replacing the filters” and “Cleaningthe heat recovery cell”.5. Disconnect the quick connector (H) of the supply air fan (T) and/or theextract air fan (P) cables.6. Push the fan cables and the rubber feed through (I) into the fanchamber.7. Remove the wing screws used to fasten the fans (J) (3 screws per fan).8. Remove the fan from the unit by pulling it forward and by tilting itslightly backwards at the same time.9. Remove the mounting screws (K) (4 screws) of the air flow controlgrille of the supply air fan and remove the grille. You can now cleanthe fan. Put the control grille back in place after cleaning.10. Reassemble in reverse order after cleaning. Ensure that the rubberfeed throughs set in place when reinstalling the fan.11. Close the door. Ensure that the safety switch catch of the door istouching the safety switch.12. Plug the ventilation unit back into the mains.The fan has now been checked and cleaned.IMPORTANTThe fans are extremelysensitive to external shocks. Itis recommended that the fansbe cleaned in place, i.e. withoutattempting to remove them.Handle the fan blades carefully.Do not remove or move the fanblade balancing weights.T PDCEITPHJ JKS