BENDIX BW1811 manual Unloaded for a minimum of 30 seconds. This

AD-IP™AIR DRYER TROUBLESHOOTING CHART (Continued)

SYMPTOMS		CAUSE	REMEDY
2. Water and/or Oil in	D.	Purge (air exhaust) time	D. Check causes and remedies for Symptom #1.
Supply or Service		insufficient due to
Reservoir (continued).		excessive system
		leakage (see causes for
		Symptom #1).
	E. Excessive air usage,		E. See Appendix A, Table A, column 1, for
			recommended compressor sizes. If the
		duty cycle too high - Air
			compressor is “too small” for the vehicle vocation
		dryer not compatible
			(for example, where a vehicle’s vocation has
		with vehicle air system
			changed or service conditions exceed the original
		requirement (Improper air
			vehicle or engine OE spec’s) then upgrade the
		dryer/vehicle
			compressor. Note: The costs incurred (e.g.
		application).	installing a larger capacity compressor, etc.) are
	NOTE: Duty Cycle is the		not covered under original compressor warranty.
			Charge Cycle Time - The AD-IP™air dryer is
	ratio of time the compressor
	spends building air to total		designed to provide clean, dry air for the brake
			system. When a vehicle’s air system is used to
	engine running time. Air
			operate non-brake air accessories it is necessary
	compressors are designed
			to determine that; during normal, daily operation
	to build air (run “loaded”) up
			the compressor should recover from governor
	to 25% of the time. Higher
			“cut-in” to governor “cut-out” (usually 100 psi to
	duty cycles cause
			120 psi) in 90 seconds or less at engine RPM’s
	conditions that affect air
			commensurate with the vehicle vocation. If the
	brake charging system		recovery time consistently exceeds this limit, it
	performance which may		may be necessary to “bypass” the air accessory
	require additional		responsible for the high air usage. An example of
	maintenance. Factors that		where a by-pass system would be required is
			when the compressor is used to pressurize a
	add to the duty cycle are: air
			tank trailer for purposes of off-loading product.
	suspension, additional air
			Consult your local authorized Bendix parts outlet
	accessories, use of an
			or sales representative for additional information.
	undersized compressor,
			Purge Cycle Time - During normal vehicle
	frequent stops, excessive
			operation, the air compressor must remain
	leakage from fittings,
			unloaded for a minimum of 30 seconds. This
	connections, lines,
			minimum purge time is required to ensure
	chambers or valves, etc.
			complete regeneration of the desiccant material.
			If the purge time is consistently less than the
			minimum, an accessory by-pass system must be
			installed. Consult your local authorized Bendix
			parts outlet or sales representative for additional
			information.
			Air Compressor Size - Although the AD-IP™air
			dryer can be used in conjunction with larger
			compressors, it was designed primarily for units
			rated for up to 30 CFM. It is recommended that
			when using the AD-IP™air dryer with a
			compressor which has a rated displacement
			exceeding 30 CFM that an authorized Bendix
			parts outlet or Bendix marketing representative
			be contacted for assistance.
	F.	Air compressor	F. Restricted discharge line. See Appendix A, Table
		discharge and/or air	A, column 1 & 2 for recommended sizes. If
		dryer inlet temperature	discharge line is restricted or more than 1/16”
			carbon build up is found, replace the discharge
		too high.
			line. Replace as necessary.

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