Bendix Commercial Vehicle Systems AD-SP SYSTEM PURGE AIR DRYER 10/04 - Manual (Page 14)

14
VEHICLE APPLICATION REQUIREMENTS
The basic application requirements presented here
apply to a standard air dryer installation. The majority
of highway vehicles in use today will meet these basic
requirements however, some may not. Examples of
vehicles that may not meet the requirements include,
refuse trucks, city coaches, bulk trailer unloading
operations and other high air consumption systems.
While the Bendix AD-IP air dryer can be used on these
vehicles, the standard installation procedure presented
in this manual may require modification to ensure proper
operation and service life. Consult your local authorized
Bendix ® parts outlet or sales representative for additional
information.
Charge Cycle Time — The AD-IP air dryer is designed to
provide clean, dry air for the brake system. When a vehicle’s
air system is used to operate non-brake air accessories it is
necessary to determine that, during normal daily operation
the compressor should recover from governor “cut-in” to
governor “cut-out” (usually 100 psi to 120 psi) in 90 seconds
or less at engine RPMs normal to the vehicle vocation. If
the recovery time consistently exceeds this limit, it may be
necessary to “bypass” the air accessory responsible for the
high air usage. Consult your local authorized Bendix parts
outlet or sales representative for additional information.
Purge Cycle Time — During normal vehicle operation, the
air compressor must remain unloaded for a minimum of 30
seconds. This minimum purge time is required to ensure
complete regeneration of the desiccant material. If the
purge time is occasionally shorter than the times specified,
no permanent ill effect should be expected, however, if
the purge time is consistently less than the minimum,
an accessory bypass system must be installed. Contact
the nearest authorized Bendix parts outlet or Bendix
representative for additional information. Note: Reservoir
Volume - Total vehicle reservoir volume can impact the
Charge and Purge Cycle time. The chart below can be
used as a guide in determining if additional help is required.
Total Vehicle Reservoir
Volume Requirement
Less than 9,000 cu. in. ........................Standard AD-IP Air Dryer
9,000 - 12,500 cu. in. ..........................Extended Purge AD-IP Air
Dryer
Greater than 12,500 cu. in. ............ Contact Bendix Rep. or
Bendix Engineering
Air Compressor Size — Although the AD-IP air dryer can
be used in conjunction with larger compressors, it was
designed primarily for units rated for up to 30 CFM. It is
recommended that when using the AD-IP air dryer with a
compressor which has a rated displacement exceeding
30 CFM that an authorized Bendix parts outlet or Bendix
marketing representative be contacted for assistance.
8. Using an adjustable wrench or a socket, tighten the
desiccant cartridge bolt (10), to secure the desiccant
cartridge (11) to the end cover (6). Torque the desiccant
cartridge bolt to 65–75 ft-lbs (40 ft-lbs minimum). Do
not over torque.
BENDIX ® AD-IP ® AIR DRYER INSTALLATION
1. Using the relationship marks made during step 7 of the
Bendix ® AD-IP ® Air Dryer Removal Procedure, install
the lower mounting bracket (9) on the end cover (6) and
secure it using the two 3/8” cap screws and washers
(7 & 8). Torque the cap screws to 300–360 in-lbs.
2. Using the relationship marks made during step 6 of the
AD-IP Air Dryer Removal Procedure, install the saddle
bracket (5) and mounting strap (4) on the end cover
(6), and using the 5/16” cap screw (1) and sleeve nut
(3) secure the strap to the saddle bracket. Tighten the
5/16” nut on the upper mounting bracket. Torque to
60-100 in-lbs.
3. Install the air dryer on the vehicle using the four
bolts that secure both the upper and lower mounting
brackets.
4. Reconnect the three airlines to the proper ports on
the end cover (identified during step 3 of the AD-IP Air
Dryer Removal).
5. Reconnect the vehicle wiring harness to the Bendix
AD-IP air dryer heater and thermostat assembly
connector by plugging it into the air dryer connector
until its lock tab snaps in place.
6. Before placing vehicle back into service, perform the
Operation and Leakage Tests stated elsewhere in this
manual.
RETROFITTING THE AD-IP AIR DRYER
GENERAL
The following retrofit instructions are presented for
reference purposes only since Bendix aftermarket retrofit
and replacement air dryers are packaged with the most up-
to-date installation instructions. The instructions packaged
with the Bendix AD-IP air dryer should be followed in lieu
of those presented here.
The preceding portion of this manual deals with “in-service”
repair and/or replacement of the AD-IP air dryer. The portion
of the manual that follows is concerned with installing an
AD-IP air dryer on a vehicle not previously equipped with
one.