PUREGAS, LLC P550W Series Air Dryers User’s Guide
13.10 Can’t Create a High Humidity Alarm / Shutdown
These troubleshooting steps assume that the Humidity Element is removed from the Humidity Block during the Testing Humidity Alarm and System Shutdown
(section 9.12 ) procedures.
Possible Cause
Humidity Sensor Cable disconnected
Check
Verify that Humidity
Sensor cable is connected to the Control
Board
Defective Humidity
Sensor
Verify that Humidity reading fails to climb higher than 15% or creates sporadic readings
Defective Control Board Verify that Humidity reading is over 15% for more than 1 minute
Corrective Action
Connect Humidity
Sensor cable
Replace Humidity
Sensor (section 11.2 )
Replace Control Board if no alarm is created and system does not shut
down (section 11.1 )
13.11 High Flow Rate Alarm
Possible Cause Check
Air leak in downstream cable outside of Dryer
Verify Flow Rate
( FLOW ) reading is not higher than expected
(section 8.5.5.2 )
Air leak inside of Dryer Test fittings and hoses
for leaks (section 9.15 )
High Flow Alarm set point too low
Verify High Flow Alarm set point
(section 8.7.1 )
Corrective Action
Fix downstream problem
Reconnect or replace bad fitting / hose
Raise High Flow Alarm
set point (section 8.7.1 )
13.12 High Cabinet Temperature Alarm
Possible Cause
Fan Failure
High Ambient
Temperature
Check
Verify fan is running
(section 9.9 )
Verify temperature of
Dryer operating location. Recommended ambient temperature is
40°-85°F.
Corrective Action
Check for loose fan
wiring (section 14.1 )
Replace defective fan
(section 11.1 )
Lower the ambient temperature of the
Dryer’s operating location
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