BENDIX AD-9 Dati di servizio - Pagina 15
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AD-9 AIR DRYER TROUBLESHOOTING CHART (Continued)
SYMPTOMS
2. Water in vehicle
reservoir.
CAUSE
A. Desiccant requires
replacement - excessive
contaminants in
desiccant cartridge
assembly.
B. Improper discharge line
length or improper line
material. Maximum air
dryer inlet temperature is
exceeded.
C. Air system charged from
outside air source
(outside air not passing
through air dryer).
D. Air dryer not purging
(see Symptom #5).
E. Purge (air exhaust) time
insufficient due to
excessive system
leakage (see causes for
Symptom #1).
F. Excessive air usage - Air
dryer/vehicle application
requires additional purge
volume. Air dryer not
compatible with vehicle
air system requirement
(Improper air dryer/
vehicle application).
REMEDY
A. Replace desiccant cartridge.
B. Refer to section entitled Connecting the Air
Lines and check Discharge Line size and
length.
C. If system must have outside air fill provision,
outside air should pass through air dryer. This
practice should be minimized.
D. See cause and remedy for Symptom #5.
E. Check causes and remedies for Symptom #1.
F. Charge Cycle Time - The AD-9 is designed to
provide clean, dry air for the brake system.
When a vehicles air system is used to operate
non-brake air accessories it is necessary to
determine that during normal, daily operation
the compressor should recover from governor
cut-in to governor cut-out (usually 100 psi to
120 psi) in 90 seconds or less at engine RPMs
commensurate with the vehicle vocation. If the
recovery time consistently exceeds this limit, it
may be necessary to bypass the air accessory
responsible for the high air usage. An example
of where a by-pass system would be required is
when the compressor is used to pressurize a
tank trailer for purposes of off-loading product.
Consult your local authorized Bendix parts
outlet or sales representative for additional
information.
Purge Cycle Time - During normal vehicle
operation, the air compressor must remain
unloaded for a minimum of 20 seconds for
the standard AD-9 or 30 seconds for the
Extended Purge Model. These minimum
purge times are required to ensure complete
regeneration of the desiccant material. If the
purge time is consistently less than the
minimum, an accessory by-pass system must
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