AD Series Dehumidifying Dryers Page 63
Troubleshooting 9
Problem Possible cause Corrective action
Dirty filter. Clean or replace filter.
Desiccant beds are
contaminated by material or
plasticizer leaking into the
system.
Replace desiccant. See Section
6-5 on Page 56 for more
information.
Blower overload has tripped.
Fix the problem and reset the
overload.
Little or no air coming from
the process delivery tube.
Blower fins filled with dust or
contaminants.
Remove blower side plate, clean
baffles, replace.
Suction in delivery tube,
pressure from the return tube.
Phase is reversed on power
drop coming into the dryer.
Stop the dryer.
If the dryer was connected to the
drying hopper, check to see if
the desiccant and process air
heater has been contaminated
with resin.
If so, replace the desiccant and
remove any resin carry-over.
Otherwise, change the phase of
two legs of the three-phase
power drop.
Process heaters are faulty.
Check for open heaters.
Replace if required.
Solid-state temperature
controller faulty.
Replace.
Loss or reduction of process air
temperature.
Process temperature was
adjusted in error by plant
personnel.
Make sure that plant personnel
are aware of the proper
temperature set point. Post an
appropriate sign next to the
controller.
Process heaters are faulty. Replace.
Desiccant beds are
contaminated.
Replace desiccant.
Material being dried differs from
material specified at the time of
purchase.
Drying systems are designed for
the material which was originally
specified. Different materials
may need a longer residence
time or a different drying
temperature.
Loss or reduction in drying
capacity.
Break in flex hose to/from drying
hopper.
Inspect for air leaks; replace as
needed.
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