Troubleshooting l 6-7
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
A3 - Process Heater High
Temperature (cont.)– The
snap switch in the process
heater tube opens due to exces-
sive temperature.
A4 - Regeneration Heater
High Temperature – The
snap switch in the regeneration
heater tube activated due to
excessive temperature.
A7 - Return Air High
Temperature – If the return
air temperature at the inlet to
the blower is greater than
180°F {82°C}, it shuts down
the dryer.
Possible cause
The isolation contactor failed in the
closed position.
The process heater output on the board
has failed.
The heater solid state relays (SSRs) failed.
The regeneration exhaust is blocked or the
air hoses are loose.
The regeneration blower is not running or
running in the wrong direction.
The isolation contactor failed in the
closed position.
The heater solid state relays (SSRs) failed.
The regeneration heater output on the
board has failed.
The hopper does not contain enough
material.
You are drying at a high drying tempera-
ture (above 240°F {116°C}) or you are
running at low throughputs.
Solution
Replace the isolation contactor.
Replace the board.
Replace the failed heater solid state
relays (SSRs).
Locate and remove any airflow restric-
tions.
Tighten hoses.
Correct the cause of the non-running
blower (blown fuses, etc.) or reverse
the rotation of the blower.
Replace the isolation contactor.
Replace the failed heater solid state
relays (SSRs).
Replace the board.
Make sure your material supply system
is working properly.
Ensure water flow to the aftercooler.
6
Troubleshooting
When supplied for central drying applications, these shutdown alarms are not available.
(continued)
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