Sterlco SHA Series Hot Air Dryer - Manual (Page 15)

Hot Air Dryers Chapter 6: Troubleshooting 15 of 17
Chapter 6: Troubleshooting
Problem Possible Cause Possible Remedy
Little or no air coming from
process. Dirty air filters. Clean or replace filters.
Suction in delivery tube. Phase is reversed on power
drop coming into the dryer. Stop the dryer. If the dryer
was connected to the drying
hopper, verify that no
material has been sucked
into the heater can. Change
the phase of two legs of the
3-phase power drop. Never
change the phase at the
motor starters.
Process heaters are faulty. Replace.
Solid-state temperature
control is faulty. Replace.
Loss or reduction of process
air temperature
Process temperature was
adjusted in error by plant
personnel. Make sure that the plant
personnel are aware of the
proper temperature set point.
A sign posted next to the
control would be helpful.
Process heaters are faulty. Replace
Change in material being
dried from material which
was originally specified. Drying systems are designed
for the material which was
specified at the time of
purchase. Different
materials may need longer
residence times or higher
drying temperatures.
Loss of reduction in drying
capacity.
Break in flex hose to drying
hopper. Inspect for air leaks.
Replace if necessary.
Process temperature set too
high due to operator error. Material in drying hopper
cakes, or meltdown occurs.
Safety set point out of
adjustment.
Check plastic data sheet for
meltdown temperature.
Make sure that plant
personnel are aware of the
correct process temperature
set point.