Bendix Commercial Vehicle Systems AD-IS AIR DRYER AND RESERVOIR SYSTM - Manual (Page 2)

2
FIGURE 2 - BENDIX ® AD-IS ® AIR DRYER AND RESERVOIR SYSTEM CHARGE CYCLE
The Bendix ® AD-IS ® PuraGuard ® oil coalescing air dryer
has an identical appearance to the standard AD-IS ® air
dryer, but contains a coalescing media at the inlet of the
desiccant bed. The coalescing media provides a higher
level of oil removal over the standard AD-IS air dryer.
The AD-IS PuraGuard oil coalescing air dryer has all of
the same functions as the standard AD-IS air dryer and is
used in applications where lower oil concentration levels
are required.
Important! When servicing, note that standard AD-IS
air dryers or air dryer cartridges may be serviced with
PuraGuard oil coalescing air dryers or cartridges, however,
PuraGuard oil coalescing air dryers or cartridges must only
be serviced with like replacements.
Note: Unless otherwise stated in this manual, AD-IS air
dryer and reservoir systems refers to both the standard and
PuraGuard
oil coalescing air dryer and reservoir systems.
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 and reservoir
systems may have different pressure settings. These are
factory set and must not be changed or adjusted.
The air dryer and reservoir system consists of a “spin on”
desiccant cartridge secured to a base assembly. The
base assembly contains a delivery check valve assembly,
COMPRESSOR
GOVERNOR
DESICCANT
BED
DELIVERY
CHECK VALVE
(OPEN)
PRIMARY
PORT (PRI)
PURGE VALVE
(CLOSED)
TURBO
CUT-OFF
VALVE
(OPEN) ENGINE
TURBO
UNLOADER
PORT
SUPPLY
PORT
PRIMARY
RESERVOIR
PRESSURE
PROTECTION
VALVES
AUXILIARY PORTS
(TO ACCESSORIES)
SEE
NOTE 1
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 fl 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.
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
DIAGRAM SHOWS ALL PRESSURE
PROTECTION VALVES OPEN.