Wilkerson DE2 User Manual
Page 11
Instruction Manual / DE0, DE1 and DE2
Wilkerson Compact Heatless Air Dryers
MODELS DE0, DE1 AND DE2 TROUBLESHOOTING GUIDE
A
PROBLEM: AIR DRYER DELIVERS WET AIR
POSSIBLE CAUSE
CHECK
CORRECTIVE ACTION
A1
High inlet air temperature.
Inlet air temperature should not
Reduce inlet air temperature.
exceed sizing criteria stated
at purchase (usually
70˚F or 100˚F).
A2
Air demand in excess of rated Check downstream flow demand
Reduce air usage downstream.
capacity of air dryer.
with flowmeter.
A3
Low inlet pressure.
Verify actual inlet pressure vs.
Increase inlet pressure or call
nameplate operating pressure.
factory to resize dryer for
inlet conditions.
A4
Dirty or obstructed inlet air
Check filter element.
Replace.
filter.
A5
Purge orifice plugged.
Remove and inspect purge orifice.
Clean hole of debris. Use air
gun to clean.
A6
Solenoid coil burned out.
Check magnetic field from coil
Remove cover, place iron or
operation.
steel material (screwdriver or
nail) on exposed end of solenoid
base to feel the magnetic effect,
indicating proper operation.
(Note: each coil should be
energized for 30 seconds).
A7
Oil contamination of
Verify particle/coalescing inlet
Towers must be replaced if
desiccant beds.
filtration is adequate and
contamination is suspected.
functioning. Inspect inside of
desiccant towers for oily residue.
A8
Timer not operating properly.
Check for proper voltage across
Replace timer if voltage is
L2 and DC1 and across L2 and
present at either DC terminal
DC2. Verify timing cycle is 30
continuously or not at all during
seconds per side. Voltage should
the 1 minute cycle -or- if wrong
read 53 volts DC on a 115 volt AC
voltage is measured.
unit or 106 volts DC on a 230 volt
AC unit.
A9
Purge flow restricted.
Check mufflers for excessive back
Replace mufflers.
pressure.
If purge air is piped away from
unit, oversized piping should be
used and length of run should be
as short as possible.
A10 Desiccant attrition
Remove the desiccant chambers
Install new towers or have
from the air manifold. Check if
towers repacked at the factory.
perforated disc at open end of the
chambers can be depressed more
than 1/4" from the retaining ring.
A11 Solenoid core spring broken.
Remove solenoid valve, inspect
Spring should be seated on core
core assembly.
and not broken. Replace if
necessary.