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350-2100 cfm Dryers Chapter 7: Troubleshooting 53 of 58
PROBLEM POSSIBLE CAUSE CORRECTIVE ACTION
Loss or reduction of
process air temperature.
A. Process heaters are
faulty.
A. Check for open or
shorted heaters. Replace if
required. Check the fuses.
B. Solid-state temperature
controller faulty.
B. Replace.
C. Process temperature
was adjusted in error by
plant personnel.
C. Make sure that plant
personnel are aware of the
proper temperature
setpoint. A sign posted next
to the control would be
helpful.
Loss or reduction in drying
capacity.
A. Process heaters are
faulty.
A. Replace.
B. Desiccant beds are
contaminated.
B. Replace desiccant.
C. Material being dried
differs from material
specified at the time of
purchase.
C. Drying systems are
designed for the material
which was originally
specified. Different
materials may need a
longer residence time or
different drying
temperature.
D. Break in flex hose
to/from drying hopper.
D. Inspect for air leaks;
replace if necessary.
E. Airflow valves sticking
or failing to shift.
E. Check for proper
operation of linear valve
actuator. Check fusing.
Repair or replace if
necessary.
F. Blower fins filled with
dust or contaminants.
F. Remove blower
sideplate, clean baffles,
replace. Replace filter
elements.