Wilkerson DE2 - Manual (Page 7)

Instruction Manual / DE0, DE1 and DE2
Wilkerson Compact Heatless Air Dryers
MAINTENANCE INSTRUCTIONS
A. Field Adjustments – Following proper installation of the Wilkerson DE heatless air dryer, no
field adjustments are necessary. No lubrication is required on the dryer.
B. Six-Month Check – It is recommended that every 6 months of operation, unit be thoroughly
inspected. Inspection should include audible inspection of the towers switching and purge flow.
Visual inspection should include checking for excessive dirt or oil fouling and for desiccant
attrition at the outlet and purge exhaust area. This involves removal of the manifold cover.
Remove mufflers, if installed, and check for excessive pressure drop by blowing through the
muffler. If large resistance is felt, mufflers should be replaced.
C. One-Year Check – Annual inspections should be more thorough and should include removal
of the solenoid valves and purge orifice glands for in-depth inspection of internal wear or dete-
rioration of the solenoid valve parts, Viton check balls, and for plugging of the purge orifices.
D. Purge Orifices – If the operating conditions change from the label specifications (eg. inlet
pressure, outlet flow), it is necessary to replace the purge orifices. There are two orifices in the
DE series air dryers. The orifices are extremely critical parts in determining the performance of
the dryer and no attempt should be made to enlarge or reduce the hole size on the side of the
hex orifice gland. Orifices of the proper size must be obtained from your local Wilkerson
distributor. The label on the dryer should also be changed, noting the present operating
conditions. Purge orifices are screwed into the manifold beneath the desiccant chambers. To
change orifices, unscrew the hex orifice glands using a standard 7/8" socket wrench.
E. Cycle Timer – The solid state cycle timer requires no maintenance and can be replaced in
field.
F. Desiccant Towers – Improper packing of the desiccant chambers can cause channeling of the
air stream and improper drying. For this reason, NO ATTEMPT SHOULD BE MADE TO
REPACK DESICCANT CHAMBERS IN THE FIELD. Replacement chambers should be
obtained from your local Wilkerson distributor.
G. Operating Air Dryer Improperly – Following improper dryer operation, i.e., low inlet pressure,
high air temperature or high outlet flow, shut off the outlet flow from the air dryer for several
hours to allow the dryer to operate, purging the desiccant towers of excessive moisture. If this
does not restore dryer to proper working order, consult the troubleshooting guide at the end of
this instructional manual.
H. Oil Contamination – Oil contamination of the desiccant towers will cause complete loss of
drying capability. If oil is detected in the desiccant towers or any other components, it will be
necessary to install replacement towers in order to restore dryer to normal operation.
I. Replacement Parts – Contact your local authorized Wilkerson distributor for dryers or replace-
ment parts.