Wilkerson DE5 - Manual (Page 10)

Instruction Manual / DE3, DE4 and DE5
Wilkerson Compact Heatless Air Dryers
MODELS DE3, DE4 AND DE5 TROUBLESHOOTING GUIDE
A PROBLEM: AIR DRYER DELIVERS WET AIR
POSSIBLE CAUSE CHECK CORRECTIVE ACTION
A1 No power to unit. On/off switch or power supply. Correct power problem.
A2 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).
A3 Air demand in excess of rated Check downstream flow demand Reduce air usage downstream.
capacity of air dryer. with flowmeter.
A4 Low inlet pressure. Verify actual inlet pressure vs. Increase inlet pressure or call
nameplate operating pressure. factory to resize dryer for
inlet conditions.
A5 Dirty or obstructed inlet air filter. Check filter element. Replace.
A6 Purge orifice plugged. Remove and inspect purge orifice. Clean hole of debris. Use air
gun to clean.
A7 Solenoid coil burned out. Check magnetic field from coil Replace.
operation. Place iron or steel
material (screwdriver or nail) top
of coil to feel the magnetic effect,
indicating proper operation.
(Note: each coil should be
energized for 40 seconds every
other minute).
A8 Oil contamination of Verify particle/coalescing inlet Towers must be replaced if
desiccant beds. filtration is adequate and contamination is suspected.
functioning properly.
A9 Timer not operating properly. Verify correct timing cycle. At no time should there be
1. With terminals pulled back simultaneous signals at S1
slightly from lugs on timer, place and S2.
voltmeter across N and S1.
There should be a 115 volt AC
Replace timer if defective.
signal for 40 seconds and
0 volts for 80 seconds.
2. Check across N and S2 for
same timing.
A10 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.