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G) Fault Finding
PROBLEM
VISUAL INDICATION
Poor
All pressure gauges
Dewpoint.
showing line pressure
for more than 5 mins.
Pressure gauge
showing back
pressure on
depressurised side.
Dryer fails to
pressurise.
Moisture content
indicator (amber).
PROBABLE
CHECK
CAUSE
Loss of power.
Incoming supply.
Heater failure.
Check heaters for
electrical integrity.
Poor signal to open
Remove non-
exhaust valve.
pressurised side
tube. Check fittings
for air leaks.
Exhaust valve
As above.
by-passing.
Faulty logics.
Check function by
removing tubes.
Air leak from
Broken diaphragm
solenoid.
in solenoid valve.
Exhaust elements
Element media
blocking up.
blocked up with
water, desiccant or
oil carryover.
Faulty 'or' logic
Remove non-
at moisture
pressurised side
indicator causing
tube, and check
by-passing.
for back pressure.
Air leak.
Broken or damaged
exhaust/inlet valve
discs.
Dryer pressurised
Check cam timer
on one side only.
rotation and fuse.
Entrained water.
Check pre-filter
drains
Purge air too low.
Check purge rate.
Inlet pressure
Check inlet
too low.
pressure.
Air flow demand
Check for recent
too high.
additions to
compressed air
system or
excessive peak
demands.
35
REMEDY
Replace fuses if
necessary.
Replace if
necessary.
Replace seals or
cylinders.
As above.
Change if
necessary.
Replace solenoid
valve.
Replace elements.
Check for
desiccant attrition
and oil carryover.
Replace 'or' logic.
Check and renew
where necessary.
Replace where
necessary.
Replace drain
if necessary.
Reset purge rate.
Increase inlet pressure
Ensure flow rate does not
exceed the rated flow
capacity of the dryer.
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