Bendix Commercial Vehicle Systems AD-IS EVERFLOW ASSEMBLY User Manual

Page 10

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