BENDIX AD-IS - Handbuch - Seite 5

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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. If the vehicle vocation

has changed it may be necessary to upgrade the

compressor size. Refer to Bendix Specification

BW-100-A, Appendix D to determine if any changes

are necessary.

C. Location of the air dryer and reservoir system is too

close to the air compressor. Refer to Bendix

Specification BW-100-A, Appendix B for discharge

line lengths.

D. In areas where more than a 30 degree range of

temperature occurs in one day, small amounts of

water can temporarily accumulate in the air brake

system due to condensation. Under these

conditions, the presence of small amounts of

moisture is normal.

Note: A small amount of oil in the system is normal and

should not be considered as a reason to replace the

desiccant cartridge. Some oil at the dryer exhaust is normal.

2. Visually check for physical damage such as chaffed or

broken air and electrical lines and broken or missing

parts.

3. Check the AD-IS

air dryer and purge reservoir bolts for

tightness. See Figure 1. Re-torque the three air dryer

bolts to 360-420 inch pounds and the four purge reservoir

bolts to 300-360 inch pounds.

4. Perform the Operation & Leakage Tests listed in this

publication.

WARNING!

This air dryer and reservoir system 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 and reservoir system. Alcohol

is removed by the dryer, but reduces the effectiveness

of the device to dry air. Use of these or other substances

can damage the air dryer and reservoir system and

may void the warranty.

HEATER & THERMOSTAT

FIGURE 4 - AD-IS

AIR DRYER AND RESERVOIR SYSTEM

HEATER AND THERMOSTAT CONNECTOR

OPERATION & LEAKAGE TESTS (ALSO SEE

VIDEO BW2327)

1. Check all lines and fittings leading to and from the air

dryer and reservoir system for leakage and integrity.

Repair any leaks found.

2. Build up system pressure to governor cut-out and note

that the AD-IS

air dryer and reservoir system purges

with an audible escape of air. Watch the system

pressure and note the pressure fall-off for a ten minute

period. If pressure drop exceeds, for a single vehicle - 1

psi/minute from either service reservoir; or for tractor trailer

- 3 psi/minute from either service reservoir, inspect the

vehicle air systems for sources of leakage and repair

them. Refer to section entitled Troubleshooting,

Symptoms 1 and 4.

3. Caution: Be sure to wear safety glasses in case of

a purge blast. Check for excessive leakage around

the purge valve with the compressor in the loaded mode

(compressing air). Apply a soap solution to the purge

valve exhaust port and observe that leakage does not

exceed a 1" bubble in 1 second. If the leakage exceeds

the maximum specified, refer to section entitled

Troubleshooting, Symptom 4.

4. Build up system pressure to governor cut-out and note

that the AD-IS

air dryer and reservoir system purges

with an audible burst of air, followed immediately by

approximately 30 seconds of air flowing out of the purge

valve. "Fan" the service brakes to reduce system air

pressure to governor cut-in. Note that the system once

again builds to full pressure and is followed by an

AD-IS

air dryer and reservoir system purge. If system

does not follow this pattern, refer to section entitled

Troubleshooting, Symptoms 5 and 6.

5. Check the operation of the end cover heater and

thermostat assembly during cold weather operation as

follows:

CONNECTOR