Specifications

20
Troubleshooting (cont’d)
Problem Probable Cause Remedy
High Dewpoint High inlet air flow Reduce inlet air flow
Inletairtemperatureabove
design spec
Reduce inlet air temperature to design spec
Poorpre-filtration Checkpre-filterelement,replaceifneeded
Inletairpressurebelow
design spec
Increasepressuretothedryer
Desiccantcontaminated Replace desiccant
OutletPurgefloworifice
may be clogged
Dismantleoutletorificeandcleanoutthe
orifice
Backpressurein
regenerating chambers
Mufflersareclogged,installnewmufflers
Exhaustvalve(s)notfully
opening or closing
Checkpilotvalveandpilotairsupply,
dismantleandcleanexhaustvalve,checkflow
controlvalveattachedtopurgeexhaustvalve
actuatormaynotbeadjustedproperly(should
beadjustedsoexhaustvalveopenswithina
8-12secondtimeperiod)
Inletvalveleaking Dismantleandclean,replacesealsifneeded
Noinputpower Checkthatdryerisonwithcorrectvoltage
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 flow velocities due to high flow
Inletprefilterdirty Inspectandreplaceasneeded
High inlet flow rate Reduce inlet flow rate to meet dryer spec
Outlet filter dirty Inspectandreplaceasneeded
Desiccantdiffuserscreens
clogged
Inspectedandcleanifneeded
High Back Pressure in
Regenerating Tower
Purgemufflerclogged Clean and replace if needed
Desiccantdiffuserscreens
clogged
Inspectedandcleanifneeded
Restrictivepurgeexhaust
piping
Clean and replace with larger pipe if required
AircelAHLDE-Series-Models1000-5000