Alarms
• Shutdown (A#): The dryer has automatically shut down because it has detect-
ed a serious problem that could damage your material or dryer.
• Passive (P#): The dryer continues to operate, but warns of a problem that could
prevent correct drying of your material. If ignored, this problem could lead to a
condition that will shut down the dryer.
Problem
A25 & P5 - Return Air Mid-
High Temperature – If the
return air temperature is
between 150 and 180°F {66
and 82°C}.
A26 & P6 - Regeneration
High Temperature – If the
regeneration temperature
exceeds the high temperature
limit for the specified time.
Default values are 400°F
{204°C} for 20 seconds.
A27 & P7 - Regeneration
Low Temperature – The
regeneration temperature is
less than the low temperature
setpoint for the specified time.
Defaults are 200°F {93°C} for
20 seconds.
Possible cause
The hopper does not contain enough
material.
You are drying at a high drying tempera-
ture (above 240°F {116°C}) or running
at low throughputs.
The aftercooler does not have enough
water.
The aftercooler coils are dirty.
One of the solid state relays (SSRs)
failed in the closed position.
The output on the board has failed.
The regeneration heater has failed.
The output on the control board has
failed or the fuse has blown.
The regeneration RTD is loose or has
fallen out.
Solution
Make sure your material supply system
is working properly.
Ensure water flow to the aftercooler.
Turn on the water supply, or fix any
leaks or blockages.
Clean the aftercooler coils. See
Maintenance section entitled, Cleaning
the aftercooler coils.
Replace the failed solid state relays
(SSRs).
Replace the board.
Check the heater fuses and resistance
across each leg of the process heater.
Replace the control board or the fuse.
Check the regeneration RTD and tighten
if needed.
6-10 l Troubleshooting
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