Conair HTC 120, User Manual, Page: 319 / 330

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Tr o u b l e s h o o t i n g l
6-33
Poor Material Dr ying
Troubleshooting
(continued)
Dew point - The process air must be at a low dew point 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 satisfacto-
ry if the dew point of the air is -20 to -40° F {-29 to -40° C}. If your dryer does not
have a dew point readout, you can check the dew point with a portable dew point
instrument. Conair sells a variety of portable dew point meters. Contact Conair
Parts.
Problem
Dryer dew point is not
reaching proper setpoint.
Possible cause
Low regeneration temperature.
Poor regeneration air flow.
High dew point, ambient air leaking into
the closed loop drying circuit.
Return air temperature to the dryer is too
high. (The return air temperature on
W1600-5000 dryers is measured at the
inlet to the desiccant wheel.)
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.
See Installation section enti-
tled, Checking for proper air flow.
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/intercooler coils.
See Maintenance section entitled,
Cleaning the aftercooler/intercooler
coils.
See Troubleshooting section entitled,
Replacing the desiccant wheel assembly.
Replacement dew point
monitors are available
from Conair.
Contact Conair Parts
(800) 458 1960
From outside of the
United States, call:
(814) 437 6861