BENDIX BW1948 manual DRM/AD-ISAIR Dryer Troubleshooting Chart

DRM™/AD-IS®AIR DRYER TROUBLESHOOTING CHART (Continued)

SYMPTOMS	CAUSE	REMEDY
2. Water in vehicle	A. Maximum air dryer inlet	A. Check for excessive carbon build up in
reservoirs.	temperature is	compressor discharge line. Replace if
	exceeded due to	required. Make certain that discharge line
	improper discharge line	length is at least 6 ft. Increase discharge line
	length.	length and/or diameter to reduce air dryer inlet
		temperature.
	B. Air system charged from	B. If system must have outside air fill provision,
	outside air source	outside air should pass through air dryer.
	(outside air not passing
	through air dryer).
	C. Excessive air usage -	C. Note: The AD-IS®air dryer is not intended for
	Air dryer not compatible	use on applications with excessive air usage.
	with vehicle air system	The following applications require more dry air
	requirement (Improper	than the AD-IS®air dryer is designed to supply.
		Do not use on:
	air dryer/vehicle
		1) City buses.
	application).
		2) Vehicle combinations with more than 8 braked
		axles.
		3) City refuse vehicles except those with work
		brakes.
		4) Concrete mixers.
		5) Dump trucks with more than 3 axles.
		6) Off-highway/construction vehicles with more
		than 7 braked axles.
		7) Vehicles with compressor on times in excess
		of 20%.
		If the vehicle is equipped with high air usage
		accessories such as trailer pump-off systems or
		central tire inflation, the air for these accessories
		must by-pass the dryer.
	D. Desiccant requires	D. Replace desiccant cartridge assembly.
	replacement.
	E. Air by-passes desiccant	E. If vehicle uses Holset compressor, inspect
	cartridge assembly.	feedback check valve for proper installation and
		operation.
	F. Air dryer not purging.	F. Refer to Symptom 6.
	G. Purge (air exhaust) time	G. Refer to Symptom 1.
	insufficient due to
	excessive system
	leakage.

11