SERVICE MANUALFig. 1 AE-1 Alcohol EvaporatorBENDIX AE1 & AE2 TYPESDESCRIPTIONThe alcohol evaporator is designed to permitvaporized alcohol to be drawn into the air brake systemto overcome possible freezing of any moisture in the airbrake system.IMPORTANTInstallation of an alcohol evaporator does not mean thatdaily draining of all air reservoirs is not required. In amoisture-laden atmospheric air system, a properlyinstalled and maintained alcohol evaporator and dailydraining of all reservoirs will be very effective inpreventing air system freeze-ups.The AE-1 alcohol evaporator (Fig. 1) is the olderstyle evaporator. It has a die cast body which houses thefilter, filter cap and evaporator tube. The die cast bodyalso serves as a mounting bracket. The container caneither be glass, plastic or metal and may also either be apint, quart or two-quart size.Fig. 2 AE-2 Alcohol EvaporatorThe newer alcohol evaporator is known as the AE-2(Fig. 2). The body and evaporator tube are moldedtranslucent plastic and is available in the quart size only.The new style evaporator is not available with a steelcontainer; therefore, it cannot be used with turbochargedcompressor induction.Some installations require the use of a check valveto prevent alcohol entering the engine induction system.OPERATIONWhen the air compressor is in the compressingcycle, a partial vacuum is present at the compressorintake. A line from the evaporator is connected to thecompressor intake, therefore a vacuum is created abovethe alcohol in the alcohol reservoir. Air at atmosphericpressure or greater, depending upon the type ofinstallation, enters the evaporator and passes throughthe tube which is immersed in the alcohol. This airpassing through the alcohol causes the alcohol to bubbleand the vapor formed by the bubbling is induced into thecompressor intake and on into the air system.CTS-4079 - CHAPTER XIII - Page 3
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