Wilkerson DE5 - Manual (Page 15)

Instruction Manual / DE3, DE4 and DE5
Wilkerson Compact Heatless Air Dryers
MODELS DE3, DE4 AND DE5 TROUBLESHOOTING GUIDE
F PROBLEM: SHUTTLE VAL VE NOT FUNCTIONING PROPERLY
POSSIBLE CAUSE CHECK CORRECTIVE ACTION
F1 No power to shutoff With power on, disconnect If voltage at #17 and #18, and
solenoid valve. humidity alarm sensor cable voltage at #11 and #15, and no
from sensor. This will make voltage at #15 and #16, relay is
sure unit is not in alarm and bad. Replace relay.
shutoff valve should be
energized. With voltmeter,
check for line voltage at
shutoff solenoid valve, wires
#15 and #16. If not reading line
voltage, check wires #17 and
#18, then wires #11 and #18.
F2 Coil burned out. With power on, disconnect If no magnetic effect can be felt,
humidity sensor cable from replace coil.
sensor. This will make sure unit
is not in alarm and shutoff valve
should be energized. Check
magnetic field from coil operation.
Hold iron or steel material
(screwdriver end or nail) at top of
coil to feel the magnetic effect,
indicating proper operation.
F3 Valve needs maintenance If valve leaks with power off or if Install valve maintenance kit.
kit. causes F1 and F2 are eliminated,
you may need to install a valve
maintenance kit.