SERVICE MANUALFig. 3 Cutaway View of AE-1 Alcohol EvaporatorCONSUMP"ION OF ALCOHOLComplaints of inoperative alcohol evaporator orexcessive use of alcohol can be traced to either wrongkit being installed or an incorrect installation of a kit. Forthat reason the correct selection of a kit is veryimportant.The consumption of alcohol will vary on differentvehicles. The main determining factor on properlyinstalled and maintained units is the percentage of timethe air compressor is in its loaded (compressing) cycle.Since the alcohol is only used when the compressor iscompressing air, good maintenance practice should befollowed by keeping air leakage in the system to aminimum and keeping the brakes adjusted.It ii difficult to estimate the amount of alcohol avehicle will use. A guide to determine if the alcoholevaporator is working properly is:Alcohol Usage = 30 cc to 70 cc(1 oz to 2 ozs) perhour if compressoris continuouslypumping .Fig. 4 Cutaway View of AE-2 Alcohol EvaporatorExample: of a compressor on a tractor-trailer will beloaded (compressing air) 20% of the total operating timeof 12 hours (or roughly 2-1/2 hours), consumption ofalcohol can be calculated by multiplying 70 cc of alcohol(maximum usage) by 2.5 hours, or approximately 175 ccof alcohol (1/3 to 1/2 pint) in 12 hours. Additionalcalculations reveal that if a compressor operates agreater percentage of time, more alcohol will be used.TYPE OF ALCOHOLIt is recommended that only pure methanol alcohol beused in the air brake system. Certain types of alcoholand antifreeze solutions contain ingredients which leaveresidue or deteriorate parts in the air system.Bendix Heavy Vehicle System Group markets alcoholunder the name "Air Guard."1 Qt. Can - Part No. 2421001 Gal. Can - Part No. 246972CTS-4079 - CHAPTER XIII - Page 4
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