PUREGAS, LLC
P550W2 Series Air Dryers User’s Guide
Page 88 of 99
P012226 – Rev. F
13.9 High Humidity
Possible Cause
Check
Corrective Action
Low System Pressure
Verify System Pressure
(section 8.9 )
Adjust System Pressure
(section 8.9 )
Low Flow Rate
Verify Flow Rate
(
FLOW
) reading is low
(section 8.5.5.2 )
Install the included
Precision Bleed Orifice
fitting to maintain a
constant air flow.
(section )
High Humidity Alarm
set point too low
Verify High Humidity
Alarm set point
(section 8.7.4 )
If Flow Rate is low,
allowing a higher alarm
set point (up to 10%)
will allow Dryer to run
within acceptable levels.
Raise High Humidity
Alarm set point
(section 8.7.4 )
Over 10% not
recommended
Defective Humidity
Sensor
Perform the Testing
Humidity Alarm and
System Shutdown test
(section 9.12 )
Troubleshoot
Can’t
Create a High Humidity
Alarm / Shutdown
condition
(section 13.10 )
Heatless Dryer not
cycling between towers
Verify consistent
Heatless Dryer cycling
(section 9.6 )
Troubleshoot
Inconsistent Heatless
Dryer Cycling
condition
(section 13.13 )
Defective Control Board Unplug Humidity
Sensor from Control
Board (see section 11.1
for Board location)
Humidity reading should
drop to 0%
If Humidity did not drop
to 0%, replace Control
Board (section 11.1 )
CAUTION!
Do not test the Humidity Sensor with an ohm meter or apply
any DC voltage.
This will render the Humidity Sensor defective.
Summary of Contents for P550W2 Series
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