Bendix Commercial Vehicle Systems AD-9 AND AD-9 IPC AIR DRYERS 4/11 - Manual (Page 5)

5
LOWER
MOUNTING
BRACKET
AD-9 ® / AD-9 ® IPC
AIR DRYER
END COVER
FEMALE
CONNECTOR
MALE
CONNECTOR
LATCH MUST BE
INSERTED UNTIL
IT SNAPS OVER
TAB ON MATING
CONNECTOR
SIDE VIEW END VIEW
A two lead, 12 inch, wire harness with attached weather
resistant connector is supplied with all retrofi t and
replacement Bendix
® AD-9 ® and AD-9 ® IPC air dryers.
Connect one of the two leads of the wire harness to
the engine kill or ignition switch. The remaining lead of
the wire harness must be connected to a good vehicle
ground. A fuse should be installed in the power carrying
wire; install a 10 amp fuse for 12 volt heaters and a 5
amp fuse for a 24 volt heater. Use 14 AWG wire if it
is necessary to lengthen the wire harness provided.
Make certain all wire splices are waterproofed. Tie
wrap or support all electrical wire leading to the
AD-9
® or AD-9 ® IPC air dryer.
FIGURE 6 - HEATER AND THERMOSTAT CONNECTOR
Every 900 operating hours or 25,000 miles or every
three (3) months:
1. Check for moisture in the air brake system by opening
reservoirs, drain cocks, or valves and checking for
presence of water. If moisture is present, the desiccant
may require replacement; however, the following
conditions can also cause water accumulation and
should be considered before replacing the desiccant:
A. An outside air source has been used to charge the
system. This air did not pass through the drying bed.
B. Air usage is exceptionally high and not normal for
a highway vehicle. This may be due to accessory
air demands or some unusual air requirement that
does not allow the compressor to load and unload
(compressing and non-compressing cycle) in
a normal fashion. Check for high air system
leakage. If the vehicle vocation has changed it may
be necessary to upgrade the compressor size.
Refer to Appendix A, Table A and the column titled
Vehicle Vocation.
C. The air dryer has been installed in a system that
has been previously used without an air dryer. This
type of system will be saturated with moisture and
several weeks of operation may be required to dry
it out.
D. Location of the air dryer is too close to the air
compressor. Refer to the Locating Bendix ® AD-9 ®
and AD-9 ® IPC Air Dryer On Vehicle section and
Appendix A, Table A, column 2 for discharge line
length; or
E. In areas where more than a 30 degree range of
temperature occurs in one day, small amounts
of water can accumulate in the air brake system
due to condensation. Under these conditions, the
presence of small amounts of moisture is normal
and should not be considered as an indication that
the dryer is not performing properly.
Note: A small amount of oil in the system may be normal
and should not, in itself, be considered a reason to
replace the desiccant; oil stained desiccant can function
adequately.
2. Check mounting bolts for tightness. Re-torque to
270–385 inch pounds.
3. Perform the Operation & Leakage Tests listed in this
publication.
Oil removal requirements for air brake quality vary by
vehicle manufacturer. Because vehicle vocation and
maintenance can infl uence when the AD-9
® IPC air dryer
cartridge requires replacement, each fl eet should modify
their replacement schedule based on experience. The
change out interval will be extended if the compressor
passes a low level of particles, and the interval will be
reduced if excessive carbon particles are delivered to the
dryer inlet. Higher compressor build up times at idle and
water or oil in downstream reservoirs indicate an AD-9 ®
IPC air dryer desiccant cartridge may need to be replaced.
Every 10,800 hours; 300,000 miles or 36 months:
1. Rebuild the air dryer including the desiccant cartridge.
Note: The desiccant change interval may vary from vehicle
to vehicle. Although typical desiccant cartridge life is three
years, many will perform adequately for a longer period of
time. In order to take maximum advantage of desiccant life
and assure that replacement occurs only when necessary, it
is important that Operation & Leakage Tests be performed.
WARNING!
This air dryer is intended to remove moisture and other
contaminants normally found in the air brake system.
Do not inject alcohol, anti-freeze, or other de-icing
substances into or upstream of the air dryer. Alcohol
is removed by the dryer, but reduces the effectiveness
of the device to dry air. Use of other substances can
damage the air dryer and may void the warranty.