Conair 150 User Manual page 109

Problem
Regeneration Temperature
Loop Break – The regenera-
tion temperature is outside of
the operator entered deviation
alarm band (see Regeneration
Temperature Deviation passive
alarm) and the regeneration
temperature is not moving
towards the setpoint at a rate
greater than specified. Default
values are 2°F {1°C} over 40
seconds.
Process Dewpoint – The dew-
point has not fallen below the
setpoint. If the dewpoint goes
below the setpoint for 180
second the alarm should go
away.
✐
NOTE: The alarm is not
active for the first 5
minutes.
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 once the Acknowledge Alarm button is pressed once, the
blinking amber LED becomes solid.
✐
NOTE: Passive alarms can be configured as shutdown alarms (see the previous Shut-
down Alarms section). See page 4-26, screen 62 for instructions.
Possible cause
The regeneration heater has failed.
The regeneration RTD is loose or has
fallen out.
The regeneration blower is not running.
The output on the control board has
failed or the fuse is blown.
Defective dewpoint sensor.
The hose or wiring connections to the
sensor block are loose or have fallen off.
Poor regeneration air flow.
The desiccant wheel may be
contaminated.
Desiccant wheel not turning.
Leaks in the process air stream.
Solution
Check the heater fuses, and resistance
across each leg of the process heater.
Check the regeneration RTD and tighten
if needed.
Correct the cause of the non-functioning
blower.
Replace the control board or fuse.
Replace the sensor.
Check wiring and hose connections to
the sensor, re-secure if needed.
Remove the air flow restrictions, dirty
filters, etc.
Check the desiccant for contamination,
replace if needed. Install plasticizer /
volatile trap for severe situations.
Replace the desiccant wheel. See
Troubleshooting section entitled,
Replacing the desiccant wheel.
See Troubleshooting section entitled,
Passive alarms, Wheel rotation failure.
Check for worn or lose hoses.
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