Conair W Series User Manual page 103

Pa s s i v e A l a r m s
If the amber Acknowledge Alarm LED is blinking, the alarm is a passive alarm.
The dryer continues to operate, but this problem could prevent correct drying of
your material. Note that when the Acknowledge Alarm button is pressed once, the
blinking amber LED becomes solid.
i
Problem
Return Air Mid-High
Temperature – If the return
air temperature is between 150
and 180°F {66 and 82°C}.
Regeneration Low
Temperature – The regenera-
tion temperature is less than
the low temperature setpoint
for the specified time.
Defaults are 200°F {93°C} for
20 seconds.
Regeneration High
Temperature – If the regener-
ation temperature exceeds the
high temperature limit for the
specified time. Default values
are 400°F {204°C} for 20
seconds.
NOTE: Passive alarms can be configured as shutdown alarms (see the previous Shutdown Alarms
section). See page 4-25 screen 62 for instructions.
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.
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.
One of the solid state relays (SSRs)
failed in the closed position.
The output on the board has failed.
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.
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.
Replace the failed solid state relays
(SSRs).
Replace the board.
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