15UseSuctionSwitch on the suction with button(2). The suction output can be regu-lated in 5 levels. You will see theselected level in the display. Level 0would mean that the suction isturned off.In case the suction motor over-heats, the unit will switch off auto-matically. Leave the unit to cool offfor a while before starting it again.Should the same failure appearagain, please return the unit to yoursupplier for inspection.Exchange Micro FilterWhen changing the microfilter, it is advisable to weara face mask conforming toEN 14683 type IIR or EN 149 FFP2.Only operate the unit with a suctionfilter assembled. Control the microfilter after every 10 operating hours.Exchange a full filter immediately. Afilter should be exchanged at leastafter 50 operating hours.At first, unfold the paper of the mi-cro filter (art. 5179) and push yourfinger into the opening in the front.Pull out the lid of the dust chamberand remove the old filter. Hold thefilter in the middle to prevent it frombending and sliding off (see picturebelow).The dust filter (art. 5179)must be used. The paperfilter (art. 5115) must NOTbe used.Exchange Control Unit FilterThe control unit filter (art. 3752) hasto be exchanged after every 200operating hours. Remove the oldfilter and place the new one in itsholder.