3
BENDIX
®
AD-IS
®
AIR DRYER AND RESERVOIR
SYSTEM OPERATION: GENERAL
(Refer to Figure 2.)
The AD-IS air dryer and reservoir systems are 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.
FIGURE 3 - BENDIX
®
AD-IS
®
AIR DRYER AND RESERVOIR SYSTEM PURGE CYCLE
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 and reservoir system. For ease of maintenance, all
replaceable assemblies can be serviced without removal
of the air dryer and reservoir system from its mounting on
the vehicle. Refer to
Preventive Maintenance
section.
DIAGRAM SHOWS ALL PRESSURE
PROTECTION VALVES OPEN.
COMPRESSOR
GOVERNOR
DESICCANT
BED
DELIVERY
CHECK VALVE
(CLOSED)
PRIMARY
PORT (PRI)
PURGE VALVE
(OPEN)
TURBO
CUT-OFF
VALVE
(CLOSED)
ENGINE
TURBO
UNLOADER
PORT
SUPPLY
PORT
PRIMARY
RESERVOIR
PRESSURE
PROTECTION
VALVES
AUXILIARY PORTS
(TO ACCESSORIES)
EXHAUST
SAFETY
VALVE
PURGE
RESERVOIR
DRAIN VALVE
SECONDARY
RESERVOIR
SECONDARY
PORT (SEC)
PURGE
RESERVOIR
PURGE
ORIFICE
OIL COALESCING FILTER
(BENDIX
®
AD-IS
®
PURAGUARD
®
OIL COALESCING AIR DRYER)
A
D
C
B
PURGE
CONTROL
CHANNEL
