Specifications

HeatlessRegenerativeDesiccantAirDryer

Shut-Down Procedure

At any point during the process of startup or shutdown, you notice anything unusual; we recommend you

refertotheoperationmanualimmediately.Ifyoucannotfindtheanswerinthetroubleshootingsection,

contact your Aircel representative or the factory at once.

1.SlowlyOPENtheby-passvalve.

2.SlowlyCLOSEtheInletandoutlet“shut-off”valves.

3.TodepressurizethedryeraftertheDryerisisolated.TurnPowerON…apurgeexhaustvalvewill

open and the dryer system starts to depressurize, also the manual vent valve on the outlet afterfilter

canbeopenedtodepressurizetheDryeruntilthetowerpressuregaugesread‘0’psig.

4.Switchoffelectricalpowerafterbothtowershavebeendepressurized.

Sequence of Operation

Step 1: Vessel 2 Depressurizing (0-5 secs)

  Vessel2(T2)purgeexhaustpilotsolenoidvalveisenergized

whichsuppliescontrolairtothepurgeexhaustvalve(V4)

whichopensslowly,depressurizingvessel2(T2).Simultaneously

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

  fromvessel2(T2)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(V1)and

  closevalve(V2),directingtheinletairtovessel1(T1)tobe

drying the air. The air flows up through the desiccant bed and

  exitstotheoutletvalve(V5)totheoutletparticulatefilterthen

to the customer dry process air system.

Step 2: Vessel 2 Regenerating (6-240 secs)

 Step2isacontinuationofstep1exceptvessel2(T2)willbe

 regenerating,vessel2(T2)purgeexhaustvalve(V4)isstillopen,

 vessel1(T1)isdryingtheinletair.Asmallportionofdryoutletair

 fromvessel1(T1)(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2(T2)until240seconds

has been reached.

Step 3: Vessel 2 Repressurizing (241-300 secs)

  Vessel2(T2)purgeexhaustpilotsolenoidvalvewillde-energize

  causingvessel2(T2)purgeexhaustvalve(V4)toclose,thisallows

  vessel2(T2)torepressurizetolinepressure,sinceaircontinuesflowing

  thoughthesmalloutletorificepressurizingvessel2(T2).Theinlettower

  selectorpneumaticpilotvalvemaintainstheinletvalve(V1&V2)positions.