BENDIX AD-IP INTEGRAL PURGE AIR DRYER Manual
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BENDIX AD-IP INTEGRAL PURGE AIR DRYER Manual

Integral purge air dryer
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®
™
Bendix
AD-IP
SAFETY
VALVE
HEATER &
THERMOSTAT
CONNECTOR
™
FIGURE 1 - AD-IP
INTEGRAL PURGE AIR DRYER
DESCRIPTION
The function of the Bendix
is to collect and remove air system contaminants in solid,
liquid and vapor form before they enter the brake system. It
provides clean, dry air to the components of the brake system
which increases the life of the system and reduces
maintenance costs. Daily manual draining of the reservoirs
is eliminated.
The AD-IP
™
air dryer consists of a desiccant cartridge
secured to a die cast aluminum end cover with a single,
central bolt. The end cover contains a check valve assembly,
safety valve, heater and thermostat assembly, three pipe
thread air connections and the purge valve assembly. The
removable purge valve assembly incorporates the purge valve
mechanism and a turbo charger cutoff feature that is designed
to prevent loss of engine "turbo" boost pressure during the
™
purge cycle of the AD-IP
all replaceable assemblies can be replaced without removal
of the air dryer from its mounting on the vehicle.
Integral Purge Air Dryer
CONTROL
PORT
SUPPLY
PORT
®
AD-IP
™
integral purge air dryer
air dryer. For ease of serviceability,
DESICCANT
CARTRIDGE
MOUNTING
STRAP
SAFETY VALVE
™
The AD-IP
connections identified as follows:
Air Connection Port ID Function/Connection
CON 4 ...................... Control Port (purge valve control
SUP 11 .................... Supply Port (air in).
DEL 2 ...................... Delivery Port (air out).
HEATER & THERMOSTAT
CONNECTOR
air dryer has three female pipe thread air
& turbo cutoff).
SADDLE
MOUNTING
BRACKET
CONTROL
PORT
LOWER
MOUNTING
BRACKET
SUPPLY
PORT
1

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Summary of Contents for BENDIX AD-IP INTEGRAL PURGE AIR DRYER

  • Page 1 INTEGRAL PURGE AIR DRYER ™ The AD-IP air dryer has three female pipe thread air DESCRIPTION connections identified as follows: The function of the Bendix ® AD-IP ™ integral purge air dryer Air Connection Port ID Function/Connection is to collect and remove air system contaminants in solid, CON 4 ......

  • Page 2: Charge Cycle

    OPERATION ™ AD-IP DI “DROP IN” AIR DRYER MODEL ™ ® In addition to the standard AD-IP air dryer, the Bendix GENERAL AD-IP ™ DI (Drop In) air dryer is also offered. It is a specialized ™ The AD-IP air dryer alternates between two operational version designed especially for air systems that use either modes or “cycles”...

  • Page 3: Purge Cycle

    SEPARATOR DESICCANT PURGE ORIFICE PURGE CONTROL VOLUME PORT PURGE CONTROL SUPPLY LINE PORT GOVERNOR DELIVERY CHECK VALVE (OLD STYLE SHOWN) PURGE TURBO DISCHARGE VALVE COMPRESSOR ENGINE CUTOFF PORT EXHAUST TURBO VALVE FIGURE 4 - AD-IP ™ INTEGRAL PURGE AIR DRYER CHARGE CYCLE Air, along with the remaining water vapor, is further cooled PURGE CYCLE (refer to Figure 5)

  • Page 4: Turbo Cutoff

    SEPARATOR DESICCANT PURGE ORIFICE PURGE CONTROL VOLUME PORT PURGE CONTROL SUPPLY LINE PORT GOVERNOR DELIVERY CHECK VALVE (OLD STYLE SHOWN) PURGE TURBO DISCHARGE VALVE COMPRESSOR ENGINE CUTOFF PORT EXHAUST TURBO VALVE 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 PURGE...

  • Page 5: Preventive Maintenance

    DESICCANT SPRING SEPARATOR DESICCANT CARTRIDGE PURGE ORIFICE PIPE PLUG PURGE CONTROL VOLUME PORT CHECK SUPPLY VALVE PORT (BLACK) DELIVERY TURBO PORT CUTOFF VALVE O-RING CARTRIDGE PURGE BOLT CHECK VALVE VALVE DELIVERY CARTRIDGE (WHITE) PORT BOLT Old Style End Cover -Vertical Delivery Check Valve New Style End Cover - Horizontal Delivery Check Valve ™...

  • Page 6: Operation & Leakage Tests

    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.

  • Page 7: Rebuilding

    2. Stop the engine and remove ignition key when When rebuilding or replacing components of the air dryer working under or around the vehicle. When use only genuine Bendix ® parts. For ease in servicing, the working in the engine compartment, the engine ™...

  • Page 8: Unit Removal

    DISASSEMBLY pressure has been depleted. The following disassembly and assembly procedure is 8. Use only genuine Bendix ® replacement parts, presented for reference purposes and presupposes that a components and kits. Replacement hardware, ™...

  • Page 9: Cleaning And Inspection

    2. Install and center the exhaust diaphragm (17) over the 8. Vertical check valve models: Remove the retaining shoulder bolt (16) making certain that the diaphragm ID ring (25) that secures the delivery check valve assembly is over the bolt shoulder. Then install the purge valve in the end cover (6).

  • Page 10: Parts View

    DLU Style Purge Valve FIGURE 9 - AD-IP ™ AIR DRYER INTERNAL COMPONENTS...
  • Page 11 ITEM# DESCRIPTION 5/16” Cap Screw O-ring 5/16” Sleeve Nut Mounting Strap Saddle Bracket End Cover 3/8” Cap Screw 3/8” Lock Washer Lower Mounting Bracket Delivery Port Pipe Plug (To Supply Reservoir) Cartridge Bolt Desiccant Cartridge O-ring Control Port O-ring (From Governor Air Dryer End Cover Retaining Ring unloader port)
  • Page 12 9,000 - 12,500 cu. in......Extended Purge AD-IP purposes only since Bendix aftermarket retrofit and Dryer replacement air dryers are packaged with the most up-to- Greater than 12,500 cu. in..... Contact Bendix Rep. or date installation instructions. The instructions packaged with Bendix Engineering ™...
  • Page 13 Refer to Appendix A, Table A for recommended discharge authorized Bendix parts outlets. A 1” ID hose can be line lengths and sizes for various vehicle applications and clamped on this special exhaust cover to allow the vocations.
  • Page 14 PURGE EXHAUST LINE 1. If it is necessary to direct AD-IP ™ air dryer discharge GOVERNOR PURGE CONTROL contaminants away from vehicle components it will be LINE TO CON PORT necessary to purchase a special exhaust cover for the ™ AD-IP air dryer (Pc.
  • Page 15 AD-IP ™ air dryer will not cycle excessively. (A) Total air system leakage (See Bendix publication BW5057 “Air Brake Handbook.”) (B) Compressor unloader mechanism. (C) Governor. (D) Drain cock and safety valve in first (supply) reservoir.
  • Page 16 ™ AD-IP AIR DRYER TROUBLESHOOTING CHART REMEDY SYMPTOMS CAUSE 1. Dryer is constantly A. Excessive system A. If leakage IS SHOWN on gauges test for “cycling” or purging. leakage. excessive service brake system leakage. Dryer purges frequently IMPORTANT: Note whether Allowable leakage: (every 4 minutes or less air pressure loss is shown...
  • Page 17 ™ AD-IP AIR DRYER TROUBLESHOOTING CHART (Continued) REMEDY SYMPTOMS CAUSE 1. Test fittings, hoses, lines and connections. 1. Dryer is constantly Apply soap solution to detect excessive “cycling” or purging. leakage. Tighten or replace as needed then Dryer purges frequently repeat the air dryer charge-purge cycle and (every 4 minutes or less observe the gauge installed in the supply...
  • Page 18 Check Valve Feedback Line Typical Drop-In Air Dryer End Cover When installing a Bendix Drop-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.
  • Page 19 Consult your local authorized Bendix parts outlet accessories, use of an or sales representative for additional information. undersized compressor,...
  • Page 20 90 degree fitting, it may be changed to a straight or 45 degree fitting. For more information on how to help prevent discharge line freeze-ups, see Bendix Bulletins TCH-08-21 and TCH-08-22. Shorter discharge line lengths or insulation may be required in cold climates.
  • Page 21 ™ AD-IP AIR DRYER TROUBLESHOOTING CHART (Continued) REMEDY SYMPTOMS CAUSE When replacing the desiccant cartridge, make 2. Water and/or Oil in sure desiccant cartridge assembly is properly Supply or Service installed and sealing rings are in place on Reservoir (continued). mounting surface of desiccant cartridge.
  • Page 22 ™ AD-IP AIR DRYER TROUBLESHOOTING CHART (Continued) REMEDY SYMPTOMS CAUSE 4. Safety valve on air dryer F. Governor malfunction. F. Test governor operation and/or inspect the “popping off” or Missing or restricted control line leading from the governor UNL exhausting air governor control line (unloader) port to the air dryer control port.
  • Page 23 ™ AD-IP AIR DRYER TROUBLESHOOTING CHART (Continued) REMEDY SYMPTOMS CAUSE A. This symptom is almost A. See Causes and Remedies for Symptoms 1, 2, 8. Desiccant material being always accompanied by 3, 4 and 5. expelled from air dryer one or more of purge valve exhaust Symptoms 1, 2, 3, 4 and (may look like whitish...
  • Page 24 250,000 miles. covered under warranty. Note: To help prevent discharge line freeze-ups, shorter discharge line lengths or insulation may be required in cold climates. (See Bendix Bulletins TCH-08-21 and TCH-08-22.) 5 For certain vehicles/applications, where turbo-charged inlet air is used, a smaller size...

  • Page 25: Additional Troubleshooting Information

    The troubleshooting procedure presented on the following pages has been excerpted from a laminated card entitled: Troubleshooting Charging and Air Supply Systems. The complete card can be obtained from authorized Bendix parts outlets under literature number BW1779. It is presented here because of the air dryers connection to the supply air system and for convenience.
  • Page 26 COMPLAINTS COMMON TO THE CHARGING & AIR SUPPLY SYSTEM Complaint: Can Not Build System Pressure • Is ECON valve required but missing? If YES, install, along with special Holset check valve w/choke. If NO and ECON • Discharge line plugged or restricted: see Common Test 1. valve present replace ECON valve and special check valve.
  • Page 27 TESTS COMMON TO MORE THAN ONE COMPLAINT 1. Discharge plugged or restricted • If build-up still NOT OK or temp. above 32 deg. F, replace air • Connect temporary discharge line from comp. discharge port dryer purge valve assembly. to supply res. & re-check build-up. If build-up OK replace 4.
  • Page 28 BW1811 © 2007 Bendix Commercial Vehicle Systems LLC All rights reserved. 5/2007 Printed in U.S.A.

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