User's Manual

3
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
CB
SECONDARY
RESERVOIR
SECONDARY
PORT
(SEC)
DIAGRAM SHOWS ALL PRESSURE PROTECTION VALVES
OPEN.