BENDIX AD-IP INTEGRAL PURGE AIR DRYER Manual page 18

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AD-IP AIR DRYER TROUBLESHOOTING CHART (Continued)
SYMPTOMS
1. Dryer is constantly
"cycling" or purging.
Dryer purges frequently
(every 4 minutes or less
while vehicle is idling)
(continued).
2. Water and/or Oil in
Supply or Service
Reservoir.
18
CAUSE
B. Holset "E" type
compressor.
A. Improper discharge line
length or improper line
material. Maximum air
dryer inlet temperature is
exceeded.
B. Air system charged from
outside air source
(outside air not passing
through air dryer).
C. Air dryer not purging
(see Symptom #5).
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. Test the Holset E Compressor unloader system
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.
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.
A. Refer to section entitled Connecting the Air Lines
as well as Appendix A, Table A columns 1 & 2
then check line size and length.
B. If system must have outside air fill provision,
outside air should pass through air dryer. This
practice should be minimized.
C. See Symptom #5.
Check Valve
Feedback Line