Poor Material Drying
Troubleshooting (continued)
Airflow - The airflow in the process drying circuit must be adequate to carry and
distribute the heat throughout the entire bed of material inside the hopper. If the
airflow is too low, the material in the center of the hopper may get heated fully to
the drying temperature, but the material against the sidewalls will not. In most
cases, the material 2/3 to 3/4 of the way toward the top of the hopper should be
heated to the proper drying temperature.
Problem
Too much or too little air-
flow.
Possible cause
Dirty process air filter.
Collapsed hoses or holes/leaks in the
hoses and hose connection.
Airflow restrictions.
Process blower running backwards or
performing poorly.
Material level in the hopper too low.
Solution
Clean or replace the process filter.
Replace any worn or damaged hoses.
Tighten all hose clamps to eliminate
leaks.
Remove any obstructions in the process
air circuit.
Verify the process blower is running in
the correct direction. If backwards,
reverse direction by switching any 2 legs
of high voltage to the motor.
Repair or replace motor.
Other than running out of material to
complete a job, the material level inside
the hopper must be a minimum of 50%
full. If the hopper is not at least half full,
the material in the cone section will not
get adequate airflow to dry properly.
NOTE: If there is too
much airflow, the material
may fluidize inside the
hopper, resulting in incon-
sistent material flow
through the hopper, which
can negatively impact
residence time.
✐
WARNING: Any electrical
checks should be performed
by a qualified electrician.
Troubleshoot ing l 6-21
6
Troubleshooting
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