Radio Frequency Systems
BD550W Series Air Dryers User’s Guide
Page 93 of 104
100518833 – Rev. B
13.11 High Humidity
Possible Cause
Check
Corrective Action
Low System Pressure
Verify System Pressure
Adjust System Pressure
to 60 PSI (414 KPa) ± 2
PSI (13.8 KPa).
Low Flow Rate
Verify Flow Rate
(
FLOW
) reading is low
Install the included
Precision Bleed Orifice
fitting to maintain a
constant air flow.
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 9.11 )
Troubleshoot
Can’t
Create a High Humidity
Alarm / Shutdown
condition
(section 13.12 )
Heatless Dryer not
cycling between towers
Verify consistent
Heatless Dryer cycling
(section 9.5 )
Troubleshoot
Inconsistent Heatless
Dryer Cycling
condition
(section 13.15 )
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.
