Bendix Commercial Vehicle Systems AD-RP PuraGuard Oil Coalescing Remote Purge Air Dryers - Manual (Page 20)

20
Bendix ® AD-RP ™ AIR DRYER TROUBLESHOOTING CHART
SYMPTOMS CAUSE REMEDY
2. Water and/or oil in
supply or service
reservoir. (continued)
F. Air compressor discharge
and/or air dryer inlet
temperature is too high.
F. Restricted discharge line - See Appendix A/ Table A/
column 1 & 2 for recommended sizes. If discharge
line is restricted — or more than 1/16" carbon build
up is found — replace the discharge line. Replace
as necessary.
Discharge Line Freeze-Up - The discharge line
must maintain a constant slope down from the
compressor to the air dryer inlet fi tting to avoid low
points where ice may form and block the fl ow. If,
instead, ice blockages occur at the air dryer inlet,
insulation may be added here. Or, if the inlet fi tting
is a typical 90° fi tting, the fi tting may be changed to
a straight or a 45° fi tting. For more information on
how to help prevent discharge line freeze-ups, see
Bendix Bulletins TCH-008-021 and TCH-008-022.
Shorter discharge line lengths or insulation may be
required in cold climates.
Insufficient coolant flow through compressor -
Inspect the Bendix AD-RP
™ air dryer was designed
primarily for use with compressors rated up to 30
CFM. Contact an authorized Bendix parts outlet or
a Bendix sales representative for assistance when
using the dryer with a compressor which has a rated
displacement exceeding 30 CFM.
Coolant line - Replace as necessary (I.D. is 1/2"
min.). Inspect the coolant lines for kinks and
restrictions, and the fi ttings for restrictions. Replace
as necessary. Verify coolant lines go from the engine
block to compressor and back to the water pump.
Repair as necessary.
Restricted air inlet (not enough air to compressor).
Check the compressor air inlet line for restrictions,
brittleness, soft or sagging hose conditions, etc.
Repair as necessary. Inlet line size is 3/4 I.D. the
maximum restriction requirement for compressors
is 25 inches of water. Check the engine air fi lter and
service if necessary (if possible, check the air fi lter
usage indicator).
(continued)