Wilkerson DE5 - Manual (Page 12)

Instruction Manual / DE3, DE4 and DE5
Wilkerson Compact Heatless Air Dryers
MODELS DE3, DE4 AND DE5 TROUBLESHOOTING GUIDE
C PROBLEM: EXCESSIVE PURGE / BLOWDOWN
POSSIBLE CAUSE CHECK CORRECTIVE ACTION
C1 Inlet or outlet shuttle not Verify nameplate specifications vs. Line pressure too low at inlet:
shifting. actual operating parameters. Increase line pressure or call
factory to resize purge orifice
for new conditions.
C2 Inlet or outlet shuttle not Verify nameplate specifications vs. Turn off downstream air usage.
shifting. actual operating parameters. If blowdown events stop
occurring, this indicates the air
flow was too much for the
compressor capacity or airline
diameter causing excessive
pressure drop.
C3 Inlet or outlet shuttle not Check for damage or contamina- Clean or replace as necessary.
shifting. tion of inlet and outlet shuttles.
C4 Inlet or outlet shuttle not Dirty or obstructed inlet air filter. Check filter element. Replace.
shifting.
C5 Purge orifice plugged. Remove and inspect purge orifice. Clean hole of debris. Use air gun
to clean.
C6 Timer not operating properly. Swith connections to S1 and S2 Replace timer.
on the solid state timer. If
symptoms appear on opposite
purge port, the timer is defective.
C7 Timer not operating properly. Incoming power is not “clean.” Supply line voltage from
Fluctuations in voltage can occur another source.
in power circuits shared by
inductive devices such as
electric motors.
C8 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
signal for 40 seconds and
0 volts for 80 seconds.
2. Check across N and S2 for
same timing.
C9 Leakage. With dryer pressurized, remove Repair as necessary.
power form dryer. Check purge
ports for large leaks. Check all
joints on dryer and air system
for large leaks.