Operation & Leakage Tests - BENDIX AD-IP INTEGRAL PURGE AIR DRYER Manual

Note: A small amount of oil in the system is normal and
should not be considered as a reason to replace the
desiccant cartridge; oil stained desiccant can function
adequately.
2. Visually check for physical damage to the AD-IP
dryer such as chaffed or broken air and electrical lines
and broken or missing parts.
3. Check mounting bolts for tightness. Re-torque to
270- 385 in.lbs.
4. Perform the Operation & Leakage Tests listed in this
publication.
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.
D. Location of the air dryer is too close to the air com-
pressor. Refer to "Locating AD-IP
Vehicle" section and Appendix A, Table A, column 2
for discharge line length.
E. In areas where more than a 30 degree range of tem-
perature occurs in one day, small amounts of water
can temporarily 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 preforming properly.
OPERATION & LEAKAGE TESTS
1. Install a pressure gauge in the #1 reservoir. Check all
lines and fittings leading to and from the air dryer for
leakage and integrity. Test the delivery port check valve
assembly by building the air system to governor cutout
and observing a test air gauge installed in the #1 reservoir.
Note the pressure on the air gauge after governor cutout
pressure is reached, a rapid loss of pressure could
indicate a failed delivery port check valve. This can be
confirmed by shutting the engine off, draining system
pressure to a point below governor cutin (usually not
less than 95 psi), draining residual air pressure in the
compressor discharge line. Remove the discharge line
at the supply port of the dryer, and use soapy water to
determine if air is flowing out of the supply port. Make
sure there is no air pressure at the control port, by
removing the line from the control port to the governor
UNL port. The reservoir needs to have a least 50 PSIG
for this test. If a 1" bubble forms within one second, the
delivery check valve should be repaired. Remove the
test gauge before returning the vehicle to service.
6
™ air
HEATER &
THERMOSTAT
CONNECTOR
SIDE VIEW
TOP VIEW
™
Air Dryer On
A two lead wire harness with attached weather resistant connector is
supplied with all replacement and retrofit AD-IP
two leads is connected to the engine "kill switch" or ignition while the
other must be connected to a good vehicle ground. A fuse is installed
in the lead carrying vehicle power; install a 10 amp fuse for 12 volt
heaters and a 5 amp fuse for the 24 volt heater.
Use 14 AWG wire if it is necessary to lengthen the wire harness leads.
Make certain all splices are weatherproofed. Tie wrap or support all
electrical wires leading to the AD-IP
FIGURE 8 - AD-IP
THERMOSTAT CONNECTOR
2. Check for excessive leakage around the purge valve.
With the compressor in loaded mode (compressing air),
apply a soap solution to the purge valve exhaust port
and observe that leakage does not exceed a 1" bubble
in 1 second. If the leakage exceeds the maximum
specified, repair the purge valve assembly.
3. Close all reservoir drain cocks. Build up system pressure
to governor cutout and note that AD-IP
with an audible escape of air. "Fan" the service brakes
to reduce system air pressure to governor cut-in. Note
that the system once again builds to full pressure and is
followed by an AD-IP
4. Check the operation of the end cover heater and
thermostat assembly during cold weather operation as
follows:
LOCKING LATCH
(MUST BE INSERTED UNTIL IT
SNAPS OVER THE MATING
CONNECTOR ON AD-IP
WEATHERPROOF
™ air dryers. One of the
™
air dryer.
™
AIR DRYER HEATER AND
™ air dryer purges
™ air dryer purge.
™
AD-IP AIR
DRYER END
COVER
™
AIR DRYER
ACCORDIAN
SEAL