Hard Seat

METAL

BLACK

RUBBER

SOFT SEAT

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 ﬁtting.

2.Air dryers do not purge.

•Insufﬁcient 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 sufﬁcient 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.