BENDIX AD-IS User's Manual | Page 3

BENDIX Dryer User's Manual - AD-IS.
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FIGURE 3 - AD-IS® AIR DRYER AND RESERVOIR SYSTEM PURGE CYCLE

COMPRESSOR

GOVERNOR

PURGE

CONTROL

CHANNEL

DESICCANT

BED

DELIVERY

CHECK

VALVE

(CLOSED)

PURGE

RESERVOIR

PURGE

VALVE

(OPEN)

TURBO CUT-

OFF VALVE

(CLOSED)

ENGINE

TURBO

OIL

SEPARATOR

PURGE

ORIFICE

PRIMARY

RESERVOIR

GOVERNOR SIGNALS AIR

COMPRESSOR TO SUSPEND

COMPRESSED AIR SUPPLY

TO AD-IS® AIR DRYER

EXHAUST

PRIMARY

PORT

(PRI)

UNLOADER

PORT

INLET
PORT

(IN)

SAFETY

VALVE

AUXILIARY PORTS

(TO ACCESSORIES)

PURGE

RESERVOIR

DRAIN VALVE

AD-IS®  AIR DRYER AND RESERVOIR SYSTEM
OPERATION: GENERAL
 (Refer to Figure 2)

The AD-IS® air dryer and reservoir system is designed to
receive compressed air from the vehicle air compressor,
clean and dry the air, deliver air to the vehicle’s primary
reservoir, secondary reservoir and accessories, and control
the compressor/dryer charge cycle.

AIR DRYER AND RESERVOIR SYSTEM
OPERATION:
  GENERAL

The AD-IS® air dryerand reservoir system alternates between
two operational modes or “cycles” during operation: the

Charge Cycle and the Purge Cycle. The following
descriptions are separated into these “cycles” of operation.

CHARGE CYCLE (Refer to Figure 2)

When the compressor is loaded (compressing air)
compressed air flows through the compressor discharge
line to the inlet (1/IN) port of the air dryer body.  The
compressed air often includes contaminates such as oil,
oil vapor, water and water vapor.

Traveling through the discharge line and into the air dryer,
the temperature of the compressed air  falls, causing some

PRESSURE PROTECTION

VALVES

A

D

C

B

SECONDARY

RESERVOIR

SECONDARY

PORT

(SEC)

DIAGRAM SHOWS ALL PRESSURE PROTECTION VALVES
OPEN.

 

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