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Purge Cycle: (See Figure 4.) When the desired system

pressure is reached, the governor cuts-out, pressurizing

the unloader cavity of the compressor which unloads the

compressor (non- compressing cycle). The line connecting

the governor unloader port to the end cover purge valve

port (bottom of the air dryer) is also pressurized, opening

the exhaust of the purge valve to atmosphere. With the

exhaust of the purge valve open, contaminants in the

discharge line and dryer sump are purged, or forced past

the open exhaust out to atmosphere.

The reverse air ﬂ ows across the desiccant and starts the

removal process of moisture from the desiccant surface.

Dry air ﬂ owing from the purge volume through the purge

oriﬁ ce and across the drying bed further dries the desiccant.

The combination of these reverse ﬂ ows strips the water

vapor from the desiccant (drying bed). This normally takes

between 15–30 seconds.

The desiccant becomes activated from this cycle and is

now ready for another charge cycle, which occurs when

the compressor returns to the compressing cycle. It is for

this reason the air dryer must be purged for 30 seconds

after receiving moisture-saturated air for a maximum of 90

seconds from a 12 CFM compressor.

This air dryer is intended to remove moisture and other

contaminants normally found in the air brake system. Do

not inject alcohol, anti-freeze, or other de-icing substances

into, or upstream of, the air dryer. Alcohol is removed by

the dryer, but reduces the effectiveness of the device to

dry air. Use of other substances can damage the air dryer

and may void the warranty.

Figure 5 – Ball Check Valve

PREVENTIVE MAINTENANCE AND CHECKING

SERVICEABILITY

IMPORTANT

Review the warranty policy before performing any intrusive

maintenance procedures. An extended warranty may be

voided if intrusive maintenance is performed during this

period.

Every 900 operating hours, or 25,000 miles, or every three

(3) months:

1. Check for moisture in the air brake system by opening

reservoirs, drain cocks, or valves, and look for the

presence of water. If moisture is present, the desiccant

may require replacement; however, the following

conditions can also cause water accumulation and

should be considered before replacing the desiccant:

A. An outside air source has been used to charge the

system. This air did not pass through the drying

bed.

B. Air usage is exceptionally high and not normal for

a highway vehicle. This may be due to accessory

air demands or some unusual air requirement that

does not allow the compressor to load and unload

(compressing and non-compressing cycle) in a

normal fashion. Check for high air system leakage.

C. The air dryer has been installed in a system that

has been previously used without an air dryer. This

type of system will be saturated with moisture and

several weeks of operation may be required to dry

it out.

D. Location of the air dryer is too close to the air

compressor. Refer to "Installation" section.

E. In areas where more than a 30° range of

temperature occurs in one day, small amounts

of water can accumulate in the air brake system

due to condensation. Under these conditions, the

presence of small amounts of moisture is normal

and should not be considered as an indication that

the dryer is not performing properly.

Note also that a small amount of oil in the system

may be normal and should not, in itself, be

considered a reason to replace the desiccant; oil

stained desiccant can often function adequately.

2. Check mounting bolts for tightness.

3. Check the operation of the integral single check valve

in the Bendix

AD-2

valve used with the Bendix

air system to governor cut-out and observe the test

air gauge installed in the #1 reservoir. A rapid loss of

pressure could indicate a failed check valve. This can

be conﬁ rmed by checking at the purge valve exhaust.

air dryer or the "in line" check

™

AD-1

air dryer. Build the