Specifications

HeatlessRegenerativeDesiccantAirDryer
21
Troubleshooting (cont’d)
Problem Probable Cause Remedy
Dryer Fails to
Shift Towers
Exhaustvalves(s)not
functioning
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)
Noinputpower Checkthatdryerisonwithcorrectvoltage.
Controller failure Check,replaceifneeded
Pilotairsupplyrestricted Checkpilotfilter,andpilottubingrestriction.
OutletPurgefloworifice
may be clogged
Dismantleoutletpurgefloworificeandclean
out orifice
Inletvalvemalfunction
Dismantle,clean,andreinstallreplacesealsif
needed
Outlet valve malfunction
Dismantle,clean,andreinstallreplacevalveif
needed
Purge Failure Purgemufflerclogged Remove and clean, replace if needed
OutletPurgefloworifice
may be clogged
Dismantleoutletpurgefloworificeandclean
out orifice
Controller failure Check,replaceifneeded
Exhaustvalves(s)not
functioning
Checkpilotvalveandpilotairsupply,dismantle
andcleanexhaustvalvepurgeexhaustvalve
actuatormaynotbeadjustedproperly(should
beadjustedsoexhaustvalveopenswithina8-12
secondtimeperiod)checkcontrolsystem
Pressurization
Failure
OutletPurgefloworifice
may be clogged
Dismantleoutletpurgefloworificeandclean
out orifice
Exhaustvalves(s)not
functioning
Checkpilotvalveandpilotairsupply,dismantle
andcleanexhaustvalvepurgeexhaustvalve
actuatormaynotbeadjustedproperly(should
beadjustedsoexhaustvalveopenswithina8-12
secondtimeperiod)checkcontrolsystem