Van Air Systems D8 - Manual (Page 8)

PAGE 8
2950 Mechanic Street
Lake City, PA 16423-2095
Phone: 814/774-2631
Fax: 814/774-3482 MAKING COMPRESSED AIR AND GAS WORK BETTER SINCE 1944.
SECTION 6 TROUBLESHOOTING
Bypass valve open or faulty.
Check the dryer bypass valve. It might be faulty or open allowing
untreated air to enter the air system.
Low or no desiccant in the dryer.
Check the dryer desiccant bed level. Reference Section 4.4 for
filling quantities and procedures.
3. DECREASED PERFORMANCE, low desiccant usage.
The desiccant bed may be contaminated.
The dryer will tolerate normal amounts of compressor lubricant. If
the compressor manufacturer's recommended lubrication rate is
exceeded, the desiccant bed can become contaminated with
compressor lubricants.
Periodically check the desiccant bed. If the tablets are discolored
(deep yellow or brown), the bed may be contaminated.
If the bed has become contaminated, it can be flushed with an
adequate supply of water. Depending upon the severity of
contamination, it might be necessary to completely flush the entire
bed from the dryer and replace it with new desiccant.
Check the compressor for proper operation. The compressor
might be worn or over lubricated. Check the compressor
operator's manual and correct.
Check the atmospheric air near the compressor air intake. Heavy
concentrations of acid fumes or smoke and dust will cause
contamination if they are drawn into the air system. Check or
install a filter on the compressor intake.
If it is not possible to reduce the amount of lubricants in the air
system, a separator and/or coalescing filter should be installed
before the dryer.
If the check list in this section does not remedy the problem, consult your local VAN AIR distributor or call the VAN AIR factory.