Dryer with improved process air circuit airtightness and corresponding method of operation

The present invention relates to a dryer comprising a drum and a process air circuit, the process air circuit comprising: a blower for driving process air; a condensing device for condensing moisture in the treated air from the drum; a condensate water collecting container; a condensate water tank for receiving water transferred from the condensate water collection container; the overflow container is used for placing the condensate water tank; the electric pump unit is used for pumping water in the condensate water collecting container to the condensate water tank; a pump conduit fluidly connecting the pump outlet with the inlet of the condensate tank; an overflow conduit fluidly connecting the overflow container with the condensate water collection container; and a siphon located in the pump conduit and/or the overflow conduit to restrict transmission of air through these conduits, the pump conduit and the overflow conduit being adapted to direct at least a portion of the water delivered from the condensate