Troubleshooting guide

15
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Special Use Air Dryers
Several Bendix air dryers are available in specialized
“Drop-in” versions designed especially for air systems
that use either the Holset (Cummins) Type E, or QE,
air compressor. These Holset compressors use an
unloading system that requires that air pressure remain
in the discharge line during the entire unloaded cycle of
the compressor. For example, the Bendix
®
AD-IP
®
air
dryer “Drop-in” version is shown on page 13.
Bendix
®
AD-SP
®
Air Dryer
(installation uses
SC-PR
™
valve)
Bendix
®
SC-PR
™
Valve
Bendix
®
AD-SP
®
air dryers use a small amount of air
from the supply and front axle (secondary) reservoirs to
perform the purge function. Because of this difference,
the AD-SP air dryer is smaller and lighter than air dryers
that have their purge volume within the dryer canister.
A Bendix
®
SC-PR
™
Single Check Protection Valve is
used in conjunction with the AD-SP air dryer. The SC-
PR single check protection valve is a combination of two
separate devices — a single check valve and a pressure
protection valve that allows limited fl ow in the opposite
direction. It helps to protect the air pressure in the front
axle service reservoir. This is because it will only allow
its air supply to be used to help purge the Bendix AD-SP
air dryer if the pressure is above a certain preset level.
Trailer Air Dryer Systems
The Bendix
®
Cyclone DuraDrain
®
trailer water
separator is installed in the trailer control and/or
supply lines near the gladhands. It self-purges liquid
contaminates, contains solid contaminants and improves
the life of the trailer system components.
The Bendix
®
AF-3
™
in-line air fi lter screens out foreign
material from trailer air lines.
Bendix
®
PuraGuard
®
QC
™
Oil Coalescing
Filter
Bendix
®
Cyclone
DuraDrain
®
Trailer Water
Separator
Bendix
®
AF-3
™
In-line Air Filter
High Air-Use Vehicles
For high air-use vehicles — such as transit buses and
refuse trucks — the technology used in Bendix
®
System-
Guard air dryers is also available by using Bendix
®
PuraGuard
®
QC
™
oil coalescing fi lters. Installed
downstream of the air dryer, these fi lters use a replaceable
fi lter element mounted within a sump housing to remove
oil aerosols before they can enter the air system. A drain
valve allows periodic maintenance.
The Charging, Air Treatment and Storage System: Air Dryers