38BCABEFORE BEGINNINGMAINTENANCE WORKThe safety switch (S) automatically turns off thepower when the door of the unit is opened.WARNINGAlways disconnect the power plug before startingthe ventilation unit maintenance.There are two unit models, left- (L) and right-handed (R). The figure shows the right-handedmodel. In the right handed version, outdoor airblows into the unit from the right side of the centreline as shown in the instructions. In the left handedversion, outdoor air blows into the unit from the leftside. Also the position of the filters, bypass flap,and heating radiator is mirrored in the left-handedmodel.REPLACING THE FILTERS(USER)When the maintenance reminder becomesactivated, check the cleanliness of the filters andreplace them if required.The Vallox ventilation unit has three air filters:• Class G4 coarse filter filters insects, heavypollen and other relatively large foreign objectsout of the outdoor air.• Class F7 fine filter filters microscopic pollenand dust particles out of the supply air.• Class G4 coarse filter filters the extract air andkeeps the heat recovery cell clean.The filter replacement interval depends on theambient dust concentration. It is recommendedthat the filters be replaced every spring andautumn, or at the very least once a year.To replace the filters:1. Disconnect the ventilation unit from the mainselectricity supply.2. Open the upper door of the unit.3. Remove the old filters (A, B, C) and discardthem.4. Install the new filters (A, B, C).5. Close the door of the unit. Ensure that thesafety switch catch of the door is touching thesafety switch, allowing the unit to be turned on.6. Plug the ventilation unit back into the mains.7. The filters have now been successfullyreplaced.DSBCAEFGTIPUsing original Vallox filters ensuresthat the ventilation unit remains in topcondition, giving the best results.MAINTENANCE