BENDIX AD-1 AIR DRYER User Manual

1
®
Bendix
®
AD-1
™
and AD-2
™
Air Dryers
SD-08-2403
FIGURE 1
AD-2
™
AIR DRYERAD-1
™
AIR DRYER
The air dryer collects and removes moisture and
contaminants before the air reaches the first reservoir. It is
distinctly different than a reservoir drain valve or aftercooler
in that it provides “dry air” for the air brake system. The
daily draining of the system’s reservoirs is no longer
necessary, thus reducing maintenance considerably when
compared to an air brake system without an air dryer.
In a system without an air dryer, the life of air brake
components is substantially reduced because of contact
with water and oil in the system and since the air dryer
removes water and oil in vapor form, life of the component
devices is substantially increased when the air dryer is used.
The air dryer can be used on most highway vehicles where
normal compressor loaded time is 90 seconds or less and
unloaded time is 30 seconds or more. If the compressor
remains loaded for long periods of time, such as on a transit
bus, certain changes in the purge volume of the dryer must
be made. For more information regarding increase of the
purge volume, contact our Engineering Department, in Elyria,
Ohio.
The air dryer is installed in the discharge line between the
compressor and the first reservoir. The unit must be mounted
vertically and mounting brackets are provided and can be
adjusted to meet installation requirements.

BENDIX AD-1 AIR DRYER Specifications

General

Brand	BENDIX
Model	AD-1 AIR DRYER
Category	Dehumidifier
Language	English

Summary

Bendix AD-1 and AD-2 Air Dryers

Air Dryer Function and Benefits

Explains the purpose and advantages of the air dryer in removing moisture and contaminants for the air brake system.

Air Dryer Operation

Charge Cycle

Describes the process of air intake and moisture removal during compressor loading.

Purge Cycle

Details the air exhaust process to remove moisture from the desiccant.

Preventive Maintenance and Serviceability

Electric Power Supply Check

Procedure to verify electrical power is reaching the air dryer terminal.

Thermostat and Heater Operation

Tests for proper function of the thermostat and heater assembly.

Heater Element Testing

Checks the resistance of the heater element for proper operation.

Vehicle Maintenance Safety Instructions

General Rebuilding Procedures

Provides general guidance and precautions for dryer rebuilding.

Replacing and Rebuilding Air Dryers

Desiccant Cartridge Removal

Step-by-step instructions for removing the desiccant cartridge.

End Cover and Sealing Plate Procedures

End Cover Removal Procedure

Details the process for safely removing the air dryer end cover.

Desiccant Sealing Plate Rebuilding

Instructions for removing and rebuilding the desiccant sealing plate.

Desiccant Cartridge Service

Desiccant Cartridge Reinstallation

Steps for installing a new or rebuilt desiccant cartridge.

Desiccant Cartridge Rebuilding

Guidance on rebuilding current revision desiccant cartridges.

Desiccant Cartridge Disassembly

AD-1 Air Dryer End Cover Rebuilding

AD-1 End Cover Disassembly

Steps to disassemble the AD-1 air dryer end cover assembly.

AD-2 Air Dryer End Cover Rebuilding

AD-2 End Cover Disassembly

Steps to disassemble the AD-2 air dryer end cover.

AD-2 End Cover Assembly

Procedure for reassembling the AD-2 air dryer end cover.

AD-2 Outlet Port Check Valve Rebuilding

Cartridge Reinstallation

Installation of AD-1 and AD-2 Air Dryers

Air Dryer Maintenance Kits

AD-2 Air Dryer Troubleshooting