Bendix Commercial Vehicle Systems AD-IS EVERFLOW ASSEMBLY - Manual (Page 10)

10
BW2077 © 2007 Bendix Commercial Vehicle Systems LLC All rights reserved. 10/2007 Printed in U.S.A.
METAL
BLACK
RUBBER
FIGURE 7- IDENTIFICATION OF HARD AND SOFT SEAT PURGE VALVES
TROUBLESHOOTING THE AD-IS ® EVERFLOW ™
ASSEMBLY
Consult the service data sheet, SD-08-2418, for the dryer
used in your AD-IS ® EverFlow ™ assembly. The service data
sheet contains information that is useful for maintenance
and service of the air dryers.
1. Excessive dryer purging in the loaded cycle.
• The purge valves in both dryers must have soft-seat
turbo cut-off valves. See Figure 7. Remove the purge
valve an examine the upper window, replace with soft
seat purge valve.
• Excessive pressure (above 175 PSIG) in the
compressor discharge line. Look for obstruction
downstream of the AD-IS
® EverFlow ™ assembly such
as a pinched line or restrictive valve or fi tting.
2. Air dryers do not purge.
• Insuffi cient air pressure in the secondary reservoir.
The EverFlow ™ electronic module will not operate until
air pressure in the secondary tank reaches 75 PSIG.
• The check valve in the AD-IS ® EverFlow ™ supply line
from the secondary tank is installed incorrectly. Refer
to Figure 2.
• The fuse is blown or the air dryer is not connected
to the vehicle electrical system. Check electrical
connection. If the fuse is blown replace the fuse with
a higher amperage fuse. The fuse must be 15 amps
or higher.
• Incorrect voltage. The air dryer voltage must match
the vehicle voltage. Air dryers with a white heater
connector are 12 volt DC and air dryers with a grey
heater connector are 24 volt DC.
3. Air brake system will not build air.
• Compressor is undersized.
Some small capacity compressors will not develop
suffi cient air delivery at engine idle to allow proper
operation of the AD-IS
® EverFlow ™ assembly and
charge the air brake system. It may be necessary to
upgrade to a compressor with a higher delivery.
4. Water in downstream reservoirs.
• Dryers not purging. See step 2 - Air dryers do not
purge.
• Desiccant cartridges need to be replaced.
• No pressure protection valve installed downstream
of the air dryers. Refer to Figure 2.
HARD SEAT SOFT SEAT