BENDIX BW1811 manual Feedback Line Typical Drop-In Air Dryer End Cover

AD-IP™AIR DRYER TROUBLESHOOTING CHART (Continued)

SYMPTOMS	CAUSE	REMEDY
1. Dryer is constantly		6. With gauge installed at RES port of governor,
		pressure should not drop below ”Cut-In” pressure
“cycling” or purging.
		at the onset of the compressor “Unloaded”
Dryer purges frequently
		cycle. If pressure drops, check for “kinks” or
(every 4 minutes or less		restrictions in line connected to RES port. Line
while vehicle is idling)		connected to RES port on governor must be
(continued).		same diameter, or preferably larger than, lines
		connected to UNL port(s) on governor.
	B. Holset “E” type	B. Test the Holset E Compressor unloader system
	compressor.	with feedback line and check valve for proper
		operation. Make certain Holset ECON is not in
		use with the drop-in version of the air dryer, if so,
		remove and retest.
		Check Valve

Feedback Line

Typical Drop-In Air Dryer End Cover

When installing a Bendix Drop-In air dryer in a system equipped with a Holset E or QE compressor, remove the Holset ECON valve along with its feedback and governor control line.

2. Water and/or Oil in	A. Improper discharge line	A. Refer to section entitled Connecting the Air Lines
Supply or Service	length or improper line	as well as Appendix A, Table A columns 1 & 2
Reservoir.	material. Maximum air	then check line size and length.
	dryer inlet temperature is
	exceeded.
	B. Air system charged from	B. If system must have outside air fill provision,
	outside air source	outside air should pass through air dryer. This
	(outside air not passing	practice should be minimized.
	through air dryer).
	C. Air dryer not purging	C. See Symptom #5.
	(see Symptom #5).

18