During the air dryer cartridge replacement, it is necessary to clean the interior of the condensate sump fitted with a firon element - this should be replaced as necessary (see “Condensate separator”).
While replacing the air dryer cartridge in the pneumatic system, in which a high amount of water occurred or when the air dryer has been installed additionally, its inspection can give a satisfactory result only after about three weeks of operation because water already contained in the system has been already bonded to the oil and it takes a long time to separate from it.