Bedienungsanleitung Condair Mk5 (Seite 10 von 68) (Englisch)

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3.6 Functional description

TheCondairMk5steamhumidierisanunpressurizedsteamgenerator.Itoperatesontheresistance

heatingprincipleandisdesignedfordirect(withfanunit)andindirect(withsteamdistributionpipe)

room air humidication in ventilating and air-conditioning systems. In conjunction with a “Process”

steamdistributionpipetheunitmaybeusedforhumidicationinlaboratoryandprocessapplications.

Water supply

Thewateristakenviaaltervalve(accessory“Z261”)tothesteamhumidier.Itreachesthesteam

cylinderviatheinletvalve(levelcontrolled)andtheopenwatercup.

Level regulation

Thewaterlevelinthesteamcylinderiscontinuouslymonitoredwiththelevelunit.Ifthewaterlevel

reachesapresetlevel(owingtotheevaporationprocess)thelevelunitsuppliesasignaltothecon-

troller.Thisopenstheinletvalveandthesteamcylinderislledup.Whenthepresetoperatinglevelis

reached, the level unit supplies another signal to the controller to close the inlet valve.

Thepressureequalizingpipebetweenthesteamconnectionandthelevelunitensuresthatthewater

levels are the same in the steam cylinder and the level unit.

Steam generation regulation

Thesteamisproducedinthesteamcylinderbyseveralresistanceheatingelements.Anexternalorthe

internalregulatorforconnectionasrequiredcontrolthesteamproductionfullyvariablyfrom0to100%.

Flushing

Theevaporationprocessincreasestheconcentrationofmineralsinthewaterofthesteamcylinder.A

suitablevolumeofwatermustbeushedthroughthesteamcylinderfromtimetotimeandreplacedby

freshwatertoensurethatthisconcentrationdoesnotexceedaspecicvalueunsuitableforoperation.

TheMk5steamhumidierperformsanauto-adaptiveushing.Thisconsistsofthefollowingtwoforms

ofushing:

– Automatic ushing takesplaceassoonasthewaterinthesteamcylinderexceedstheupper

operatinglevel(e.g.byfoamingofthewater).

– Flushing dependent on time performstheushingprocessatpreselectedtimeintervals(seesec-

tion6.1“Adjustments”).

Automaticortime-dependentushingtakesplacedependingonthewaterqualityandtheoperating

data.Ifthelowestoperatinglevelisreachedduringtheushingprocess,theinletvalveremainsopen

untilthewaterlevelinthesteamcylinderhasreachedthenormalworkinglevelagain.Ifthelowest

operating level is not reached, the inlet valve is closed.

Lime collector tank

Themineralsprecipitatedbytheevaporationprocessaccumulateatthebottomofthesteamcylinder.

Unitsdesignedforoperationwithuntreateddrinkingwaterareequippedwithanadditionallimecol-

lectortanklocateddirectlyunderneaththesteamcylinder.Thiswaythemineralsdonotaccumulate

inthesteamcylinderbutmainlyinthecollectortankthusextendingtheserviceintervalsandreducing

the maintenance costs.

Unitsdesignedforoperationwithfullydemineralizedwaterdonothavealimecollectortankasfully

demineralizedwatercontainsonlysmallamountsofminerals.

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