Bendix Commercial Vehicle Systems AD-IS EVERFLOW User Manual

Bendix® AD-IS® EverFlow® Assembly

BENDIX

EVERFLOW®

ELECTRONIC

MODULE

PURGE RESERVOIR

SD-08-2417

EVERFLOW MODULE

GOVERNOR

PURGE

RESERVOIR

UNL

GOVERNOR

UNLOADER (2)

SEC

DELIVERY TO

SECONDARY

RESERVOIR

PRESSURE

PROTECTION

VALVES (4)

PRI

DELIVERY TO

PRIMARY

RESERVOIR

RES

GOVERNOR

RESERVOIR (2)

PURGE VALVE

EXH

GOVERNOR

EXHAUST

AD-IS® AIR

DRYER PART

NUMBER

STAMPED HERE

BENDIX® AD-IS® EVERFLOW® ASSEMBLY

DESICCANT CARTRIDGE

GOVERNOR

SAFETY

VALV E

MOUNTING

BOLTS (3)

HEATER /

SUPPLY FROM

COMPRESSOR

THERMOSTAT

PRESSURE

PROTECTION

VALVES (4)

BENDIX® AD-IS® AIR DRYER

PURAGUARD

MEDALLION

DELIVERY PORTS

MOUNTING

HOLES - 4

DELIVERY PORT

AUX1

AUXILIARY

AUX2

AUXILIARY

FIGURE 1 - BENDIX® AD-IS® EVERFLOW® ASSEMBLY, AD-IS® AIR DRYER, AND EVERFLOW® ELECTRONIC MODULE

GENERAL SAFETY GUIDELINES

WARNING! PLEASE READ AND FOLLOW THESE INSTRUCTIONS

TO AVOID PERSONAL INJURY OR DEATH:

When working on or around a vehicle, the following guidelines should be observed AT ALL TIMES:

▲ Park the vehicle on a level surface, apply the

parking brakes and always block the wheels. Always wear personal protection equipment.

▲ Stop the engine and remove the ignition key

when working under or around the vehicle. When working in the engine compartment, the engine should be shut off and the ignition key should be removed. Where circumstances require that the engine be in operation, EXTREME CAUTION should be used to prevent personal injury resulting from contact with moving, rotating, leaking, heated or electrically-charged components.

▲ Do not attempt to install, remove, disassemble

or assemble a component until you have read, and thoroughly understand, the recommended procedures. Use only the proper tools and observe all precautions pertaining to use of those tools.

▲ If the work is being performed on the vehicle’s

air brake system, or any auxiliary pressurized air systems, make certain to drain the air pressure from all reservoirs before beginning ANY work on the vehicle. If the vehicle is equipped with a Bendix® AD-IS® air dryer system, a Bendix® DRM™ dryer reservoir module, or a Bendix® AD-9si™ air dryer, be sure to drain the purge reservoir.

▲ Following the vehicle manufacturer’s

recommended procedures, deactivate the electrical system in a manner that safely removes all electrical power from the vehicle.

▲ Never exceed manufacturer’s recommended

pressures.

▲ Never connect or disconnect a hose or line

containing pressure; it may whip. Never remove a component or plug unless you are certain all system pressure has been depleted.

▲ Use only genuine Bendix

parts, components and kits. Replacement

hardware, tubing, hose, ﬁ ttings, etc. must be of

equivalent size, type and strength as original

equipment and be designed speciﬁ cally for such

applications and systems.

▲ Components with stripped threads or damaged

parts should be replaced rather than repaired. Do not attempt repairs requiring machining or

welding unless speciﬁ cally stated and approved

by the vehicle and component manufacturer.

▲ Prior to returning the vehicle to service, make

certain all components and systems are restored to their proper operating condition.

▲ For vehicles with Automatic Traction Control

(ATC), the ATC function must be disabled (ATC indicator lamp should be ON) prior to performing any vehicle maintenance where one or more wheels on a drive axle are lifted off the ground and moving.

▲ The power MUST be temporarily disconnected

from the radar sensor whenever any tests USING A DYNAMOMETER are conducted on a Bendix Wingman® Advanced™-equipped vehicle.

brand replacement

▲ You should consult the vehicle manufacturer's operating and service manuals, and any related literature,

in conjunction with the Guidelines above.

DESCRIPTION

The function of the Bendix® AD-IS® EverFlow® assembly is to provide heavy vehicles that use large amounts of air with

a dryer system that facilitates continuous ow drying. This

assembly provides, in a single package, all the components

necessary to operate two dryers. The assembly determines

if high air demand is needed and continuously switches between dryers every 30 seconds until the high air demand

ceases. When high air demand is not needed, the assembly uses the dryers as if in a normal braking system. Each dryer cycles as the air brake system requires. This feature prevents wasted air and unnecessary cycles. The assembly

uses an electronic module that determines air demand and

sequences the dryers for maximum efciency.

The Bendix® AD-IS® air dryer collects and removes 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, but still may

be mandated by law.

The function of the pressure protection valves is to protect each reservoir from a pressure loss in the other reservoir or

a pressure loss in an air accessory. Each of the pressure

protection valves in the AD-IS air dryer may have different pressure settings, but these are factory set and must not

be changed or adjusted.

Schrader

Valve

From

Engine

Compressor

Governor

CON

1/4"

CON

Supply

OUT

CON

RES

CON

EverFlow

SEC

PRI

Bendix®

AD-IS®

Air Dryer

Accessories

GOV

CON

Assembly

AD-IS

Bendix

EverFlow

Dryer OUT

CTI System

Bendix® EverFlow® Electronic Module

RES

AD-IS

CON

3/8"

1/2"

Air Dryer

Check

Valve

Supply

CON

Protection Valve

Bulk Ofoad CTI

Pressure

Bulk Tanker

Primary

Reservoir

Secondary

Reservoir

Manual Valve

Compressor

OUT

Discharge Line

Unloader Valve

Note:

The Bendix® AD-IS® air dryer purge piston has a purge control

channel drain. This allows any condensation in this area to ow

past a diaphragm in the top of the purge piston and out through a channel in the middle of the central bolt of the purge assembly to be drained. During the purge cycle this drain is closed.

FIGURE 2 - BENDIX® AD-IS® AIR DRYER SYSTEM SCHEMATIC

The air dryer consists of a “spin on” desiccant cartridge

secured to a base assembly. The base assembly contains

a delivery check valve assembly, safety valve, heater and thermostat assembly, pressure protection valves, threaded

air connections, and the purge valve assembly.

The removable purge valve assembly incorporates the purge valve mechanism and a turbocharger cut-off feature that is designed to prevent loss of engine “turbo” boost pressure during the purge cycle of the Bendix® AD-IS® air

dryer. For ease of maintenance, all replaceable assemblies

can be serviced without removal of the air dryer from

its mounting on the vehicle. Refer to the Preventative Maintenance section.

These units will not operate properly with a Holset-type

compressor. For discharge line unloaded compressors

a three way valve must be installed upstream of the air

dryer. Contact Bendix Commercial Vehicle Systems for additional information.

BENDIX® AD-IS® EVERFLOW® ASSEMBLY OPERATION

GENERAL (Refer to Figure 2)

The Bendix® AD-IS® EverFlow® assembly is designed to

receive compressed air from the vehicle air compressor.

It then cleans and dries the air before delivering it to the vehicle’s primary reservoir, secondary reservoir and

accessories. Additionally, the AD-IS EverFlow assembly controls the compressor/dryer charge cycle.

DESICCANT

BED

OIL COALESCING FILTER

(BENDIX® AD-IS® PURAGUARD®

OIL COALESCING AIR DRYER)

Note 1:

The Bendix® AD-IS® air dryer and reservoir system purge piston has a purge control

channel drain. This allows any condensation in this area to ow past a diaphragm in the

top of the purge piston and out through a channel in the middle of the central bolt of

the purge assembly to be drained. During the purge cycle this drain is closed.

UNLOADER

PORT

SUPPLY

PORT

PURGE CONTROL CHANNEL

GOVERNOR

PURGE VALVE

(CLOSED)

COMPRESSOR

DELIVERY

CHECK VALVE

(OPEN)

ENGINE

TURBO

CUT-OFF

VALV E

(OPEN)

SEE

NOTE 1

SAFETY

VALV E

SECONDARY

PORT (SEC)

PRIMARY

PORT (PRI)

PRIMARY

RESERVOIR

AUXILIARY PORTS

(TO ACCESSORIES)

PRESSURE

PROTECTION

VALVES

DRAIN VALVE

PURGE

ORIFICE

PURGE

RESERVOIR

PURGE

RESERVOIR

SECONDARY

RESERVOIR

FIGURE 3 - BENDIX® AD-IS® AIR DRYER AND RESERVOIR SYSTEM CHARGE CYCLE

AD-IS EVERFLOW AIR DRYER OPERATION:

GENERAL

The Bendix® AD-IS® EverFlow® assembly alternates

between the dryers each time the brake system charges.

During high air demand, the dryers alternate every 30

seconds to allow drying of the added volume of air. A

pressure protection valve is needed after the dryers to maintain at least 70 PSIG at the dryers during high air

demand. A Bendix® EverFlow® electronic module monitors the air brake system and determines the amount of

demand. The AD-IS EverFlow assembly requires a

signal from the delivery port of the governor into the

GOV port of the EverFlow electronic module. The AD-IS

EverFlow assembly also needs a supply air line from the

secondary tank to the electronic module RES port. This line must be 3/8 inch, or larger, tubing.

The AD-IS EverFlow assembly is primarily designed to dry

air on systems used for bulk unload and central tire ination.

The system operates best when a pressure protection valve is installed between the EverFlow assembly and the source

of the high volume air. Refer to the system schematics, Figure 2. This pressure protection valve should have a

minimum pressure of 70 PSIG. Delivery pressure in excess of 175 PSIG can cause the purge valve to cycle rapidly between load and purge mode.

NORMAL BRAKE CYCLE (Refer to Figures 3 & 4)

When the compressor is charging (compressing air) air ows through the compressor discharge line to the inlet (1 IN) port of one of the air dryers. The compressed air

includes contaminates such as oil, oil vapor, water and

water vapor. The air then ows into the desiccant cartridge, where it ows through a liquid separator which collects liquids and other contaminants.

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