Installation, Use and Maintenance Manual - ERV+DX series page 29English6.3 yearly checks• Verification of the whole electrical installation and in particular the tightening of the cable connections.• Verification of the tightening of all bolts, nuts, flanges and water connections that could be loose because of vibrations.6.3.1 Bioxigen purifying system checkOnce a year at least or when a drop in purifying efficiency is felt cleaning of capacitor shall be done.In order to service Bioxigen system, following instructions shall be carried out :• Switch off the whole unit (main power supply off)• Unscrew the 4 fixing screws of Bioxigen system, operating from the lower side of the unit close to supply air duct connection• Drop off the module (accomodating its fall) until the quartz capacitor is fully out of the unit• Unlock the electric connector• After laying the module on a flat surface, unscrew carefully the quartz capacitor (C)• Remove the external net (r); if it should be difficult, rotate it lightly around the capacitor• Clean the capacitor with a wet cloth.• Wash the net with a jet of hot water and dry thoroughly with a dry cloth• If the pipe is damaged, it shall be replaced with a new one• As soon as a whitish layer is over the metal grille inside the pipe, capacitor shall be replaced. Usual time for replacement is 18-24 months• Fit the net on the pipe and over the internal grille.• Check that tab (l) is in contact with the metal net and push it against the glass of the capacitor (C)• Clean the equipment all around outside• Screw softly the capacitor in its seat• Insert the module across the lower hole and lock the electric connector• Screw the fixing screws• Check if the system is working. Now a light noise might be audible.