MAINTENANCE34BEFORE BEGINNING MAINTENANCE WORKThe safety switch (S) automatically turns off the power when the door of the unit is opened.WARNINGAlways disconnect the power plug before starting the ventilation unit maintenance.MAINTENANCEThere are two unit models, left- (L) and right-handed (R). In theright handed version, outdoor air blows into the unit from theright side of the centre line as shown in the instructions. In theleft handed version, outdoor air blows into the unit from the leftside. Also the position of the filters, bypass flap, and heatingradiator is mirrored in the left-handed model.REPLACING THE FILTERS (USER)When the maintenance reminder becomes activated, checkthe cleanliness of the filters and replace them if required. Theventilation unit has three air filters:• Class G4 coarse filter (A) filters insects, heavy pollen andother relatively large foreign objects out of the outdoor air.• Class F7 fine filter (B) filters microscopic pollen and dustparticles out of the supply air.• Class G4 coarse filter (C) filters the extract air and keeps theheat recovery cell clean.To replace the filters:1. Disconnect the ventilation unit from the mains electricitysupply.2. Open the door of the unit.3. Lift the door off.4. Remove the old filters (A, B, C) and discard them.5. Install the new filters (A, B, C).6. Close the door of the unit. Ensure that the safety switchcatch of the door is touching the safety switch, allowing theunit to be turned on.7. Plug the ventilation unit back into the mains.8. The filters have now been successfully replaced.SCABNOTEUsing original Vallox filtersensures that the ventilationunit remains in top condition,giving the best results. Thefilter replacement intervaldepends on the ambientdust concentration. It isrecommended that the filtersbe replaced every spring andautumn, or at the very leastonce a year.