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4-20 l Operation
Initial Operation (For HAD Only)
1 Hopper material: Fill the hopper with the material to be heated.
2 Blower inlet filter: Verify that the area around the inlet filter is clean and free
of debris. This will extend the time between service of this filter.
3 Air discharge from the hopper: Verify that the sock filter hose connection to
the dust collector connections are secure and do not leak.
4 Setting of damper after material: The damper valve will need to be opened
to adjust the flow back down to 20 in. W.C. on the pressure gauge. This setting
is a suggested setting. If the airflow in the hopper is carrying over material out
of the hopper, then the flow rate may be adjusted downward by closing the
damper. If the airflow is too low then the heater will go into stand by. If the
airflow is too high, the setpoint might not be achievable.
WARNING: Fire potential - The electric heating elements are exposed to the air
going into the hopper. It is important that there is no debris in this air stream. Under
no circumstances should the HTC be run in a dirty air stream as material passing
through the heater could ignite embers and shoot sparks into the hopper, which could
catch fire.
5 Auto tuning: When the unit is fully assembled and ready for operation, it
should be tuned to the actual system that it is connected to with material in the
hopper. Follow the auto tuning procedure detailed on page 4-22 of this manual.
6 Hopper residence time: The material throughput rate must be determined by
the size of the hopper, the drying time required, and the extent of drying desired
for the product.