6-26 l Trou ble sh oo ti ng
Poor Material Drying
Troubleshooting (continued)
Dewpoint - The process air must be at a low dewpoint so it can efficiently collect
the moisture as it is released from the heated material and carry it to the dryer to be
removed in the desiccant. In most cases, the dryer will dry your material satisfactory
if the dewpoint of the air is -20 to -40° F {-29 to -40° C}. If your dryer does not
have a dewpoint readout, you can check the dewpoint with a portable dewpoint
instrument. Conair sells a variety of portable dewpoint meters. Contact Conair Parts.
Problem
Dryer dewpoint is not
reaching proper setpoint.
Possible cause
Low regeneration temperature.
Poor regeneration airflow.
High dewpoint, ambient air leaking into
the closed loop drying circuit.
Return air temperature to the dryer is too
high.
Poor desiccant performance.
Solution
Replace or check defective heaters, fuses
etc.
Clean or replace the regeneration filter.
Ensure the regeneration blower is oper-
ating properly and rotating in the correct
direction.
Remove obstructions in the air stream,
such as crimped hoses, etc.
Replace damaged hoses and seal any
leaks in the process air circuit.
If using a vacuum loader on the hopper,
ensure that the loader shroud is installed
in the hopper and that the hopper is
completely filled with material.
If partially filling your hopper, ensure
that the hopper loader is sealed against
ambient air.
Install a gasket between the loader and
the top of the hopper.
Clean the aftercooler coils. See
Maintenance section entitled, Cleaning
the aftercooler coils.
See Troubleshooting section entitled,
Replacing the desiccant wheel assembly.
Replacement dewpoint
monitors are available
from Conair.
Contact Conair Parts
(800) 458 1960
From outside of the
United States, call:
(814) 437 6861
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