BENDIX BW2657 manual Alcohol Evaporator or Injector Systems, Air Dryers, GThawing Frozen Air Lines

GAlcohol Evaporator or Injector Systems

Using an alcohol evaporator or injector in conjunction with

an air dryer is not recommended. The air dryer will remove most of the alcohol that is added at the compressor inlet and may reduce the air capacity of the dryer.

Installing an alcohol injector downstream of the dryer can cause excessive back pressure in the compressor discharge line. In some cases, this can lead to pressure relief at the compressor safety valve. If air drying capacity is not adequate, then the air dryer is undersized for the application. Please refer to the

Bendix® Air Dryer Application Guideline (BW2600) for proper recommended sizing. Also see Technical Bulletin TCH-008-042 (Alcohol in the Air Brake System) for a more detailed explanation into the affects of alcohol.

To address concerns with contaminants in trailer air brake systems, the Bendix® Cyclone DuraDrain™ trailer water separator and the Bendix® System-Guard®trailer air dryer are available. Please refer to our SD-08-2402 and SD-08-2416 respectively for details.

GAir Dryers

Proper air dryer operation is critical to helping your system run clean and dry. Ensure air brake system leakage is within the limits stated by checking the Bendix Dual Circuit Brake System Troubleshooting guide (BW1396). Refer to the applicable Bendix Service Data Sheet to confirm the correct operation and function of your vehicle’s air dryer.

Air Dryer	Bendix Service Data Sheet
Bendix® AD-2®Air Dryer . . . .	. . .	. SD-08-2403
Bendix® AD-4®Air Dryer . . . .	. . .	. SD-08-2407
Bendix® AD-9®Air Dryer . . . .	. . .	. SD-08-2412
Bendix® AD-IP®Air Dryer . . . .	. . .	. SD-08-2414
Bendix® AD-IS®Air Dryer . . . .	. . .	. SD-08-2418
Bendix® AD-SP®Air Dryer . . . .	. . .	. SD-08-2415
Bendix® Dryer Reservoir Module .	. . .	. SD-98-9808

GThawing Frozen Air Lines

Here are some simple Do’s and Don’ts for prevention and thawing:

GDo

•Check the air dryer for proper operation, changing the desiccant cartridge and purge valve as necessary.

•Thaw out frozen air lines and valves by placing the vehicle in a warmed building. This is the only method for thawing that will not cause damage to the air system or its components.

•Use dummy hose couplings on the tractor and trailer.

•Check for drooping air lines, which could form water traps.

GDon’t

•Do not apply an open flame to air lines or valves. This practice is unsafe and can result in a vehicle fire. It can also damage the valve and melt the air lines.

•Do not pour fluids into air lines or glad hands. Certain fluids can cause immediate and severe damage to rubber components. Even methanol, which is used inAlcohol Evaporators and Injectors,should not be poured into air lines. Fluids poured into the system wash lubricants out of valves, collect in brake chambers and valves, and can cause malfunction. Loss of lubricant can affect valve operating characteristics, accelerate wear and cause premature replacement.

•Do not immediately park a vehicle outside after thawing its air system indoors. Condensation will form in the system and re-freeze. Place the vehicle in operation when it is removed to the outdoors.

GSupporting Air and Electrical Lines

Ensure tie wraps are replaced and support brackets are re-attached, if removed. These items prevent the weight of ice and snow accumulations from breaking or disconnecting air lines and wires.

For more details on proper cold weather operation for your vehicles, talk to your Bendix Account Manager, call the Bendix Tech Team at 1-800-AIR-BRAKE, or visit www.bendix.com.

BW2657 ©2007 Bendix Commercial Vehicle Systems LLC, a member of the Knorr-Bremse Group • 09/07 • All Rights Reserved.