BENDIX BW1450 With gauge installed at RES port of governor, Connected to UNL ports on governor

AD-4™AIR DRYER TROUBLESHOOTING CHART (Continued)

SYMPTOMS	CAUSE	REMEDY
		6. With gauge installed at RES port of governor,
		pressure should not drop below ”Cut-In” pressure
		at the onset of the compressor “Unloaded”
		cycle. If pressure drops, check for “kinks” or
		restrictions in line connected to RES port. Line
		connected to RES port on governor must be
		same diameter, or preferably larger than, lines
		connected to UNL port(s) on governor.
	B. Leaking purge valve in air	B. Remove end cover. Apply 120 psi at control port.
	dryer end cover (control	Soap both sides around purge valve to test for
	side).	control piston leakage. Leakage should not
		exceed a 1" bubble in less than 5 seconds.
	C. Holset “E” type	C. Test the Holset E Compressor unloader system
	compressor.	with feedback line and check valve for proper
		operation. Make certain Holset ECON is not
		used with the drop-in version of the air dryer, if
		so, remove and retest.
		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 feed back 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 and 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).

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