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4

FIGURE 5 - AD-IP

™

 INTEGRAL PURGE AIR DRYER PURGE CYCLE

The actual reactivation of the desiccant drying bed begins
as dry air flows from the purge volume through the purge
orifice in the desiccant cartridge bolt, then through the center
of the bolt and into the desiccant bed. Pressurized air from
the purge volume expands after passing through the purge
orifice; its pressure is lowered and its volume increased.
The flow of dry air through the drying bed reactivates the
desiccant material by removing the water vapor adhering to
it. Generally 30 seconds are required for the entire purge
volume of a standard AD-IP

™

 air dryer to flow through the

desiccant drying bed.

The delivery check valve assembly prevents air pressure in
the brake system from returning to the air dryer during the
purge cycle. After the 30 second purge cycle is complete
the desiccant has been reactivated or dried. The air dryer is
ready for the next charge cycle to begin. However the purge
valve will remain open and will not close until air brake
system pressure is reduced and the governor signals the
compressor to charge the system.

TURBO CUTOFF FEATURE 

(Refer to Figure 6)

The primary function of the turbo cutoff valve is to prevent
loss of engine turbocharger air pressure through the AD-IP

™

air dryer in systems where the compressor intake is

FIGURE 6 - AD-IP

™

 INTEGRAL PURGE AIR DRYER TURBO

CUTOFF

DESICCANT

BED

PURGE

VOLUME

DISCHARGE

PORT

EXHAUST

PURGE

VALVE

TURBO

CUTOFF

VALVE

ENGINE

TURBO

COMPRESSOR

GOVERNOR

PURGE

CONTROL

LINE

CONTROL

PORT

SUPPLY

PORT

OIL

SEPARATOR

PURGE

ORIFICE

SUPPLY

PORT

TURBO

CUTOFF

VALVE

CONTROL

PORT

PURGE

VOLUME

PURGE

VALVE

DELIVERY

CHECK VALVE

(OLD STYLE

SHOWN)

Содержание AD-IP

Страница 1: ...ns and the purge valve assembly The removablepurgevalveassemblyincorporatesthepurgevalve mechanism and a turbo charger cutoff feature that is designed to prevent loss of engine turbo boost pressure during the purge cycle of theAD IP air dryer For ease of serviceability all replaceable assemblies can be replaced without removal of the air dryer from its mounting on the vehicle FIGURE 1 AD IP INTEGR...

Страница 2: ...S NO AIR DRYER FIGURE C AD IP DI DROP IN AIR DRYER AND HOLSET TYPE E QE COMPRESSORS AD IP DI DROP IN AIR DRYER W FEEDBACK LINE CHECK VALVE SUPPLY RES HOLSET COMPRESSOR FIGURE B STANDARD AD IP AIR DRYER AND HOLSET TYPE E QE COMPRESSORS FEEDBACK LINE W CHECK VALVE SUPPLY RES STANDARD AD IP AIR DRYER AD IP DI DROP IN AIR DRYER MODEL In addition to the standard AD IP air dryer the Bendix AD IP DI Drop...

Страница 3: ... brake system pressure builds to the governor cutout setting PURGE CYCLE refer to Figure 5 As air brake system pressure reaches the cutout setting of the governor the governor unloads the compressor air compression is stopped and the purge cycle of the air dryer begins When the governor unloads the compressor it pressurizes the compressor unloader mechanism and the line connecting the governor unl...

Страница 4: ...ke system from returning to the air dryer during the purge cycle After the 30 second purge cycle is complete the desiccant has been reactivated or dried The air dryer is ready for the next charge cycle to begin However the purge valve will remain open and will not close until air brake system pressure is reduced and the governor signals the compressor to charge the system TURBO CUTOFF FEATURE Refe...

Страница 5: ...ith moisture and several weeks of operation may be required to dry it out connected to the engine turbocharger The turbo cutoff valve also removes the puffing of air out the open purge exhaust when a naturally aspirated single cylinder compressor equipped with an inlet check valve is in use At the onset of the purge cycle the downward travel of the purge piston is stopped when the turbo cutoff val...

Страница 6: ...ith all replacement and retrofit AD IP air dryers One of the 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...

Страница 7: ...sure from A Electric Power to the Dryer With the ignition or engine kill switch in the ON posi tion check for voltage to the heater and thermostat assembly using a voltmeter or test light Unplug the electrical connector at the air dryer and place the test leads on each of the pins of the connector with the locking latch If there is no voltage look for a blown fuse broken wires or corrosion in the ...

Страница 8: ...r mounting brackets to the vehicle and remove the air dryer from the vehicle 6 Mark the relationship of the saddle bracket 5 to the end cover assembly 6 Remove the 5 16 cap screw 1 and sleeve nut 3 securing the upper mounting strap 4 to the saddle bracket 5 Earlier models used washer and nut in place of the sleeve nut 3 Remove the upper mounting strap 4 from the end cover assembly 6 7 Mark the rel...

Страница 9: ...ameter bore in the larger heater and thermostat bore in the end cover 6 Secure the heater and thermostat assembly in the body using the retaining ring 30 Make certain the retaining ring is fully seated in its groove in the end cover 6 9 Install both o rings 12 13 on the desiccant cartridge bolt 10 and using a twisting motion insert the assembled desiccant cartridge bolt in the end cover 6 8 Vertic...

Страница 10: ...10 11 16 18 19 12 13 20 22 23 10 24 15 14 7 4 6 3 5 1 33 32 30 31 14 8 24 17 19 16 18 34 35 36 2 DLU Style Purge Valve 17 22 20 21 21 15 9 FIGURE 9 AD IP AIR DRYER INTERNAL COMPONENTS ...

Страница 11: ...ton 21 QuadRing 22 PistonReturnSpring 23 O ring 24 O ring 25 RetainingRing 26 PerforatedPlate 27 Check Ring Spring 28 Check Valve 29 O ring 30 RetainingRing 31 Heater ThermostatAssembly 32 O ring 33 Safety Valve Assembly 34 Delivery Check Valve Plug 35 Spring 36 Check Valve Body white 29 25 26 27 Supply Port From Compressor Control Port From Governor unloader port Delivery Port To Supply Reservoir...

Страница 12: ...MENTS The basic application requirements presented here apply to a standard air dryer installation The majority of highway vehicles in use today will meet these basic requirements however some may not Examples of vehicles that may not meet the requirements include refuse trucks city coaches bulk trailer unloading operations and other high air consumption systems While the AD IP air dryer can be us...

Страница 13: ...nstalling an optional special exhaust cover pc no 112609 The exhaust cover is available as a separate item from authorized Bendix parts outlets A 1 ID hose can be clamped on this special exhaust cover to allow the exhaust to be redirected MOUNTING THE AD IP AIR DRYER Refer to Figure 10 1 Install the lower mounting bracket on the AD IP air dryer To accomplish this it will be necessary to choose two...

Страница 14: ...3 Use 14 gauge wire if it is necessary to lengthen the wire harness provided with theAD IP air dryer Make certain all wire splices are waterproofed using the splice kit provided with all aftermarket AD IP air dryers 4 Tie wrap or support all electrical wires leading to the AD IP air dryer at 6 8 inch intervals Note Wires should have sufficient slack and not completely taught INSTALLING AD IP AIR D...

Страница 15: ...es with an audible escape of air 3 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 a purge at theAD IP air dryer exhaust 4 It is recommended that the following items be tested for leakage to assure that theAD IP air dryer will not cycle excessively A Total air system leakage See Bendix publication BW...

Страница 16: ...essive system leakage IMPORTANT Note whether air pressure loss is shown on dash gauge s Pressure loss shown on gauges is caused by service brake system or component leakage Pressure loss NOT SHOWN on gauges is caused by supply system or component leakage CAUSE REMEDY B If leakage is NOT SHOWN on gauges test for excessive supply system leakage Remove drain cock or valve in supply reservoir wet tank...

Страница 17: ...st repair or replace governor 4 Test compressor unloader leakage Drain all air pressure from system and remove the governor from the compressor Temporarily plug the governor unloader port or air line that mated with or connected to the compressor Build air system pressure until air dryer purges then IMMEDIATELY SHUT OFF THE ENGINE Observe the air gauge in the supply reservoir If leakage is within ...

Страница 18: ...rop 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 2 Water and or Oil in Supply or Service Reservoir 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 ...

Страница 19: ...nor cut in to governor cut out usually 100 psi to 120 psi in 90 seconds or less at engine RPM s 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 o...

Страница 20: ...g hose conditions etc Repair as necessary Inlet line size is 3 4 ID Maximum restriction requirement for compressors is 25 inches of water Check the engine air filter and service if necessary if possible check the air filter usage indicator Poorly filtered inlet air poor air quality to compressor Check for leaking damaged or malfunctioning compressor air inlet components e g induction line fittings...

Страница 21: ...r hose Check for undrilled or restricted hose or tubing fittings and repair or replace as needed B Verify relief pressure is at vehicle or component manufacturer specifications Replace if malfunctioning C Refer to Appendix ATable A and column 3 Check compressor for excessive oil passing and or correct compressor installation Repair or replace as necessary Replace desiccant cartridge D Test to dete...

Страница 22: ...Kinked or blocked plugged discharge line A Connect compressor discharge to air dryer supply port Reconnect lines properly B Test check valve for proper operation Repair or replace as necessary C Check to determine if air passes through discharge line Check for kinks bends excessive carbon deposits or ice blockage D Discharge line should be constantly sloping from compressor to air dryer with as fe...

Страница 23: ...f this data sheet A A slight pinging sound may be heard during system build up when a single cylinder compressor is used If this sound is deemed objectionable it can be reduced substantially by increasing the discharge line volume This can be accomplished by adding an additional four feet of discharge line or adding a 90 cubic inch reservoir between the compressor and the AD IP air dryer IMPORTANT...

Страница 24: ...te mixer dump truck fire truck e g Line haul single trailer w o air suspension air over hydraulic brakes e g Line haul single trailer with air suspension school bus e g City transit bus refuse bulk unloaders low boys urban region coach central tire inflation 5 or less 5 or less 8 or less 12 or less Table A Maintenance Schedule and Usage Guidelines Recom mended Every Month Max of every 90 days Ever...

Страница 25: ...monly encountered complaints CONVENTIONAL SUPPLY SYSTEM INTEGRAL PURGE AIR DRYER HOLSET TYPE E QE COMPRESSOR WITH ECON VALVE FRONT REAR DASH GAUGE STANDARD SINGLE CHECK VALVE LOW PRESSURE INDICATOR SUPPLY SAFETY VALVE AIR DRYER HOLSET E OR QE COMPRESSOR SPECIAL SINGLE CHECK CHOKE IN INLET GOVERNOR HOLSET ECON VALVE REAR FRONT SUPPLY DASH GAUGE LOW PRESSURE INDICATOR STANDARD SINGLE CHECK VALVE USE...

Страница 26: ...ir and check leakage on following components in order presented Compressor unloader leakage Drain system remove governor from compressor plug governor UNL port and re test If leakage OK repair compressor unloader mechanism or replace compressor If leakage NOT OK then next Holset ECON valve used with Holset Type E QE comp missing malfunctioning leaking COMPLAINTS COMMON TO THE CHARGING AIR SUPPLY S...

Страница 27: ... up NOT OK and below 32 deg F turn ignition ON and allow heater to warm air dryer then check build up If NOT OK remove wire connector or terminal from air dryer Using test light check wire end or terminal for battery voltage with vehicle ignition ON If voltage OK repair or replace air dryer heater and thermostat If voltage NOT OK repair or replace the vehicle wire connected to air dryer Retest bui...

Страница 28: ...28 BW1811 2007 Bendix Commercial Vehicle Systems LLC All rights reserved 5 2007 Printed in U S A ...

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