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Bendix® AD-IS® EverFlow® Assembly
EVERFLOW MODULE
GOVERNOR
BENDIX
EVERFLOW®
ELECTRONIC
MODULE
PURGE RESERVOIR
BENDIX® AD-IS® EVERFLOW® ASSEMBLY |
BENDIX® AD-IS® AIR DRYER |
SD-08-2417
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PURAGUARD® |
GOVERNOR |
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RESERVOIR (2) |
MEDALLION |
PURGE VALVE |
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DESICCANT |
MOUNTING |
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PRESSURE |
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HOLES - 4 |
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CARTRIDGE |
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PROTECTION |
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GOVERNOR |
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VALVES (4) |
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SAFETY |
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VALVE |
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PURGE |
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RESERVOIR |
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MOUNTING |
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23 |
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BOLTS (3) |
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AUX2 |
UNL |
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AUXILIARY |
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DELIVERY PORT |
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GOVERNOR |
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UNLOADER (2) |
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1 |
HEATER / |
24 |
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THERMOSTAT |
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22 |
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EXH |
IN |
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AUX1 |
SEC |
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GOVERNOR |
SUPPLY FROM |
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AUXILIARY |
DELIVERY TO |
21 |
EXHAUST |
COMPRESSOR |
PRESSURE |
DELIVERY PORTS |
SECONDARY |
PRI |
AD-IS® AIR |
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RESERVOIR |
DELIVERY TO |
DRYER PART |
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PROTECTION |
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PRIMARY |
NUMBER |
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VALVES (4) |
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RESERVOIR |
STAMPED HERE |
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FIGURE 1 - BENDIX® AD-IS® EVERFLOW® ASSEMBLY, AD-IS® AIR DRYER, AND EVERFLOW® ELECTRONIC MODULE
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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® brand replacement 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.
▲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 flow 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 efficiency.
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.
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Governor
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CON |
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CON |
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Schrader |
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Valve |
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RES |
SEC |
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1/4" |
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From |
Supply |
CON |
PRI |
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Engine |
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IN |
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CON
IN OUT
Bendix®
AD-IS®
Air Dryer
Compressor |
Accessories |
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CON
EverFlow®
IN
Compressor
OUT Discharge Line
Unloader Valve
Note:
Bendix® EverFlow® Electronic Module
GOV |
RES |
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3/8" |
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CON |
CON |
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Primary |
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1/2" |
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Reservoir |
-ADIS® Assembly |
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1/2" |
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Air Dryer |
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Reservoir |
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AD-IS |
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Secondary |
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Bendix® EverFlow® |
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Check |
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IN |
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Valve |
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Supply |
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Dryer OUT |
CON |
Pressure |
Manual Valve |
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Protection Valve |
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Bulk Offload CTI
CTI System
Bulk Tanker
The Bendix® AD-IS® air dryer purge piston has a purge control channeldrain.Thisallowsanycondensationinthisareatoflow 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.
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DESICCANT
BED
OIL COALESCING FILTER (BENDIX® AD-IS® PURAGUARD® OIL COALESCING AIR DRYER)
DELIVERY
PURGE CHECK VALVE
CONTROL (OPEN)
CHANNEL
GOVERNOR
UNLOADER
PORT
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 flow 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.
PURGE PURGE RESERVOIR ORIFICE
PRESSURE
PROTECTION
VALVES
SUPPLY |
PURGE VALVE |
A |
B |
C |
D |
PORT |
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(CLOSED) |
PRIMARY |
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TURBO |
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SAFETY PORT (PRI) |
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CUT-OFF |
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PURGE |
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VALVE |
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VALVE |
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SECONDARY |
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RESERVOIR |
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ENGINE (OPEN) |
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DRAIN VALVE |
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TURBO |
PORT (SEC) |
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PRIMARY |
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COMPRESSOR |
SEE |
RESERVOIR |
SECONDARY |
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NOTE 1 |
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RESERVOIR |
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AUXILIARY PORTS |
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(TO ACCESSORIES) |
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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.ABendix® 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 inflation.
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 flows 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 flows into the desiccant cartridge, where it flows through a liquid separator which collects liquids and other contaminants.
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