Specifications

HeatlessRegenerativeDesiccantAirDryer

Aircel Programmable Controller

Step 5: Vessel 1 Depressurizing (0-5 secs)

Vessel1(T1)purgeexhaustpilotsolenoidvalveisenergized

 whichsuppliescontrolairtothepurgeexhaustvalve(V3)which

 opensslowly,depressurizingvessel1(T1).Simultaneouslythe

 inletvalvesV2andV1shiftpositionswithapneumaticsignal

 fromvessel1(T1)purgeexhaustpilotsolenoidvalvetotheinlet

tower selector pneumatic pilot valve which in-turn supplies a

 pneumaticsignaltotheinletvalvestoopenvalve(V2)andclosevalve(V1),directingtheinletair

tovessel2(T2)tobedryingtheair.Theairflowsupthroughthedesiccantbedandexitstothe

outletvalve(V6)totheoutletparticulatefilterthentothecustomerdryprocessairsystem.

Step 6: Vessel 1 Regenerating (6-240 secs)

Step6isacontinuationofstep5exceptvessel1(T1)willbe

 regenerating,vessel1(T1)purgeexhaustvalve(V3)isstillopen,

 vessel2(T2)isdryingtheinletair.Asmallportionofdryoutlet

 airfromvessel2(15%averagebasedonstandarddesigncapacity

 of100psig,100°Finletair,100°FambientairandPDPof-40°F)

 istakenthroughasmallorificeintheoutletlineandusedto

 regeneratethedesiccantbedinvessel1(T1)until240seconds

has been reached.

Step 7: Vessel 1 Repressurizing (241-300 secs)

Vessel1(T1)purgeexhaustpilotsolenoidvalvewillde-energize

 causingvessel1(T1)purgeexhaustvalve(V3)toclose,this

 allowsvessel1(T1)torepressurizetolinepressure,sinceair

continues flowing though the small outlet orifice pressurizing

 vessel1(T1).Theinlettowerselectorpneumaticpilotvalve'

 maintainstheinletvalve(V2andV1)positions.

Step 8: Extended Drying Vessel 2

AfewsecondsbeforetheendofrepressurizationtheAHLD

 E-SERIESController’sintegratedEnergyManagementPurge

 ReductionSystemlooksatthemoisturesensor,ifthemoisture

 loadislowenough,vessel2(T2)willcontinuetodryforan

 extendeddryingperioduntilthemoistureloadhasreacheda

 sethighlevel,thecontrollerwillthenadvancetostep1andthe

vessels will switch. This feature reduces the overall purge

 consumptionsavingenergyandmoney.Theextendeddrying

 cycletimerwillcountto30minutesunlesstheEMSrelativehumiditysensorishigherthanthe

setpoint.After30minutes,theunitwillswitchandcontinuenormaloperationuntilthenext

extendedsavingsstep.AtthestartofeachextendedsavingsstepthePLCchecksforfaults,EMS

relativehumiditysensorvalueandhighoutletdewpointsetting(optional)toensureifthedryer

needstocontinuedryingandthedryerwillgointoextendeddrying.Ifthedryerneedstocontinue

tothenextsteptoregenerate,theextendedsavingsstep4willbeskipped.

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