ALTEC AIR, LLC
P1500W Series Air Dryers User’s Guide
Page 88 of 100
P011787 – Rev. S
13.9 High Humidity
Possible Cause
Check
Corrective Action
Low System Pressure
Verify System Pressure
Adjust System Pressure.
Low Flow Rate
Verify Flow Rate
(
FLOW
) reading is low
Install the included
Precision Bleed Orifice
fitting to maintain a
constant air flow.
Raise capacity control
setting to 90 PSI.
(section 6.5.13)
High Humidity Alarm
set point too low
Verify High Humidity
Alarm set point
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
Over 10% not
recommended
Defective Humidity
Sensor
Perform the Testing
Humidity Alarm and
System Shutdown test
(section 9.13 )
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
11.2 )
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 P1500W Series
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