36MAINTENANCE CLEANING THE FANS (INSTALLER)Check the cleanliness of the fans when servicing the filtersand the heat recovery cell. Clean the fans as required.You can clean the fan blades with compressed air (wearprotective goggles) or by brushing them gently. Do notremove or move the fan blade balancing weights.IMPORTANTThe fans are extremely sensitive to external shocks. It isrecommended that the fans be cleaned in place, i.e. withoutattempting to remove them. Remove the fan beds andthe bypass duct carefully in accordance with the belowinstructions to prevent damage to the unit. The small size ofthe unit restricts the space available for servicing.IMPORTANTHandle the fan blades carefully. Do not remove or move thefan blade balancing weights.Cleaning the supply air fanThe steps are mirrored for the left handed unit.To remove and clean the supply air fan:1. Disconnect the ventilation unit from the mains electricitysupply.2. Unfasten the four screws to open the door of the unit.3. Lift the door off.4. Remove the extract air filter (C), the cell top bracket (E)and the heat recovery cell (D), as described in sections“Filters” and “Heat recovery cell”.5. Remove the mounting screws of the fan bed (2 pcs).6. Pull the bypass duct/filter stand package out of the unitand turn to the right.7. Remove the cable connector (black) of the fan and movethe supply air fan slightly to the right.8. Remove the post-heating radiator connector. The postheating radiator connector can be removed once thesupply air fan has been moved slightly to the right.9. Tilt the supply air fan to the right and push theconnectors out of the way. Turn the fan 90° and tilt itforward to pull it out of the unit.10. The fan has now been removed for cleaning.11. To reassemble the ventilation unit, follow the abovesteps in reverse order.12. Close the door. Ensure that the safety switch catch of thedoor is touching the safety switch.13. Plug the ventilation unit back into the mains.The fan has now been checked and cleaned.NOTEThe steps are mirrored for the lefthanded unit.