Aircel AHLD E-Series - Troubleshooting Table

AHLD Series | Heatless Regenerative Desiccant Air Dryer
30
TROUBLESHOOTING TABLE
Problem Probable Cause Remedy
High Dew Point
High inlet air ow Reduce inlet air ow
Inlet air temperature above design spec Reduce inlet air temperature to design spec
Poor pre-ltration Check pre-lter element, replace if needed
Inlet air pressure below design spec Increase pressure to the dryer
Desiccant contaminated Replace desiccant
Purge ow orice in the outlet APV valve may
be clogged
Dismantle outlet APV valve, and clean out the orice
Back pressure in regenerating chambers Muers are clogged, install new muers
Exhaust valve(s) not fully opening or closing
Check pilot valve and pilot air supply, dismantle and clean
exhaust valve, check ow control valve attached to purge
exhaust valve actuator may not be adjusted properly (should
be adjusted so exhaust valve opens within a 8-12 minute
time period)
APV valve leaking Dismantle and clean, replace seals and piston if needed
No input power Check that dryer is on with correct voltage
Controller failure Check, replace if needed
High Pressure
Drop
Low inlet pressure Increase inlet pressure to design pressure
Desiccant dusting High inlet ow velocities due to high ow
Inlet pre-lter dirty Inspect and replace as needed
High inlet ow rate Reduce inlet ow rate to meet dryer spec
Outlet lter dirty Inspect and replace as needed
Desiccant diuser screens clogged Inspect and clean as needed
High Back Pressure
in Regenerating
Tower
Purge muer clogged Clean and replace if needed
Desiccant diuser screens clogged Inspect and clean as needed
Restrictive purge exhaust piping Clean and replace with larger pipe if required