BENDIX TCH-001-058 User's Manual
Contents
1. vented to atmosphere under the control of the normal air system governor The partial system sketch below illustrates the charging treatment and storage portion of an air brake system utilizing the air dryer as the means of externally unloading the compressor Note that most Bendix air dryers typically include a turbo cut off purge valve design To use the air dryer in the manner illustrated a DLU style purge valve is required RES SINGLE D 2 GOVERNOR CHECK VALVE Ez S FRONT SERVICE COMPRESSOR DISCHARGE LINE SINGLE S CHECK D VALVE SUPPLY pe REAR SERVICE AD IP AIR DRYER WITH MUFFLER aN COMPRESSOR Discharge Line Unloading with Air Dryer and DLU Style Purge Valve The Silencer Kit for use on AD 9 AD IP and AD IS air dryers is part number 5004224 Continued Bulletin No TCH 001 058 Page 2of 2 The second method of externally unloading the compressor is by using a separate DRO Unloader Valve This valve is also normally controlled by the air system governor and may be installed in parallel or in series with the air dryer The partial system sketch below illustrates the charging treatment and storage portion of the system utilizing a DRO unloader valve in parallel as the means of unloading the compressor in combi2. Technical Bulletin Bulletin No TCH 001 058 Effective Date 5 20 2010 Cancels N A Page 1 of 2 subject Sound Emitted by Externally Unloaded Compressor This bulletin identifies a concern that can be mistakenly diagnosed as air system leakage Unloading air compressors externally by means of allowing discharge air to be vented to atmosphere rather than internally unloading the compressor to stop the building of air system pressure is commonly referred to as Discharge Line Unloading or DLU In the unloaded mode DLU compressors provide a continuous exhaust flow of air to atmosphere This exhaust flow of air may be mistakenly diagnosed as air system leakage Although this flow of air is normal the concern can be minimized by installing an approved vent hose or tube to relocate or redirect the exhaust noise or by installing an approved silencer at the exhaust outlet of the component relieving the pressure Note that using a DLU purge valve in an air brake system that has a turbo charged air compressor inlet will result in loss of turbo pressure out of the dryer thereby reducing engine power Bendix Commercial Vehicle Systems LLC is aware of two common means of externally unloading the air compressor for air braked systems in use today either through the air dryer or an external unloader valve The first method is using an air dryer with a discharge line unloading DLU style purge valve assembly to allow the compressor discharge air to be
3. nation with the dryer Note the DRO valve can be used with any style Bendix air dryer however the DRO valve will not prevent turbocharged air loss UNLOADER VALVE WITH SILENCER COMPRESSOR DISCHARGE FRONT SERVICE D 2 GOVERNOR LJ o AS PART OF I AD IS COMPRESSOR AIR DRYER REAR SERVICE Discharge Line Unloading with DRO Unloader Valve The Silencer Kit for use with the DRO Unloader Valve is part number K029328 2010 Bendix Commercial Vehicle Systems LLC All rights reserved 5 2010 Printed in U S A
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