BENDIX AD-IS AIR DRYER User Manual (English)

Questions and Answers:

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Kenneth LewisAug 16, 2025
How to troubleshoot a BENDIX AD-IS AIR DRYER if it cannot build system air pressure?
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  William FergusonAug 16, 2025
  If the BENDIX Dehumidifier cannot build system air pressure: * Check for a kinked or blocked (plugged) discharge line to determine if air passes through it. Look for kinks, bends, excessive carbon deposits, or ice blockage. * Ensure the discharge line has as few bends as possible and constantly slopes from the compressor to the air dryer, as excessive bends can collect water and freeze. * If the pressure protection valve(s) in the air dryer will not open, replace the air dryer (pressure protection valves are not serviceable). * Refer to Symptom 4, Remedy A. * Refer to Symptom 7, Remedies A and B.
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Dennis JohnsonAug 28, 2025
Why is the safety valve on my BENDIX AD-IS AIR DRYER popping off or exhausting air?
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  darren49Aug 28, 2025
  The safety valve on the BENDIX Dehumidifier might be popping off or exhausting air due to: * A defective AD-IS® air dryer and reservoir system delivery check valve. Test to determine if air is passing through check valve. Repair or replace. Refer to Symptom 1, Remedy B. * The safety valve setting being too low (less than 150 p.s.i.). Replace the safety valve. * The system pressure being too high (greater than 135 p.s.i.). Test with an accurate gauge and replace the governor if necessary. * Excessive pressure pulsations from the compressor, especially in single-cylinder types. Increase the volume in the discharge line by adding a 90 cubic inch (or larger) reservoir between the compressor and the AD-IS® air dryer and reservoir system.
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David SmithAug 31, 2025
Why is desiccant material being expelled from the BENDIX Dehumidifier purge valve exhaust?
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  lisahowardSep 1, 2025
  Desiccant material might be expelled from the BENDIX Dehumidifier purge valve exhaust due to: * A faulty dryer cartridge. Replace the AD-IS® air dryer cartridge and/or AD-IS® air dryer. * Excessive dryer vibration. Check the AD-IS® air dryer mounting for looseness or damage. Repair the mounting and replace the cartridge.
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michaelmcguireSep 4, 2025
What to do if the BENDIX AD-IS AIR DRYER does not purge or exhaust air?
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  Sherry MorenoSep 4, 2025
  If the BENDIX Dehumidifier does not purge or exhaust air: * The air dryer purge valve may be faulty. After determining air reaches purge valve control port by installing a T-fitting with a pressure gauge into the governor unloader port, repair purge valve if necessary. * Refer to Symptom 4, Remedies B, E, and F. Also refer to Symptom 1, Remedy B.
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Susan BradleySep 8, 2025
What causes unsatisfactory desiccant life in BENDIX AD-IS AIR DRYER?
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  gary95Sep 8, 2025
  Unsatisfactory desiccant life in the BENDIX Dehumidifier can be attributed to: * Excessive system leakage. Refer to Symptom 1, Remedy A. * Using the wrong vehicle application for the AD-IS® air dryer. Refer to Symptom 2, Remedy C. * The compressor passing excessive oil. Check for proper compressor installation; if symptoms persist, replace the compressor. Refer to Bendix Advanced Troubleshooting Guide for Air Brake Compressor (BW1971).