HOW REFRIGERATORS WORK.docx

HOW REFRIGERATORS WORK.docx

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HOWREFRIGERATORSWORK

HOWREFRIGERATORSWORK

Refrigeratorshaveseparatesystemsthatareresponsiblefordifferentfeatures.However,notallrefrigeratorshaveallsystems.Tolookforinformationabouttheoperationofyourrefrigerator,clickoneofthesetopics:

Automaticdefrost

Yearsago,allrefrigeratorshadtobedefrostedmanually.Youwouldturntherefrigeratoroff,openthedoor（s）,andallowanyfrostbuild-uptomelt.Whenthefrosthadcompletelymeltedaway,youwouldturntherefrigeratorbackon.

Today,allbutthesmaller,apartment-sizedrefrigeratorsareself-defrosting.Self-defrostingmeanswhatitimplies--thoughfrostcontinuestoaccumulateinsidetherefrigerator,itmeltsautomatically.Theself-defrostingsystemhasthreefunctionalcomponents:

Defrosttimer

Defrostheater

Defrostthermostat.DefrosttimerThetimerislikeaclock.Itcontinuallyadvances,24hoursaday.Every6to8hours,thetimerturnsoffthecoolingsystemoftherefrigeratorandturnsonthedefrostheater.DefrostheaterThedefrostheaterissimilartotheburnersonanelectricstove.It'slocatedjustbeneaththecoolingcoils,whichareconcealedbehindapanelinthefreezercompartment.Theheatergetshot.And,becauseit'sclosetothecoolingcoils,anyiceorfrostbuild-upmelts.

Asthefrostandicemelt,theresultingwaterdripsintoatrough.Thetroughisconnectedtoatubethatdrainsthewaterintoashallowpanatthebottomoftherefrigerator.Thewateristhenevaporatedbyafanthatblowswarmairfromthecompressormotoroverthepanandoutthefrontoftherefrigerator.DefrostthermostatTheprocessendsaftereithertheamountoftimespecifiedonthetimerorwhenthedefrostthermostatnearthecoolingcoilssensesthattheheatnearthecoilshasreachedaspecifictemperature.CoolingYou'llmorequicklyunderstandrefrigeratorcoolingsystemsifyouthinkoftheiractionas"removingheatfromtheairintherefrigerator"ratherthan"coolingtheairintherefrigerator."Allresidentialrefrigeratorsworkonthesameprincipalforcooling.Theyallhave:

ACompressor

ACondenser

AMeteringDevice（CapillaryTube）

AnEvaporatorCompressorThecompressoristhemotor（orengine）ofthecoolingsystem.Inbuilt-inrefrigeratorsthecompressorislocatedontopoftherefrigeratorbehindagrillorgrate.Inallotherunitsit'snormallyatthebottomoftherefrigeratorintheback.It'salmostalwaysblackandaboutthesizeofafootball.Iftherefrigeratorisself-defrosting,thecompressormaybebehindathinpanel.

Thecompressorrunswhenevertherefrigeratorthermostatcallsforcooling（andthedefrosttimerisnotinadefrostcycle,forself-defrostingunits）.Itisnormallyveryquiet.Whenrunning,itiscompressingarefrigerantthatisinalow-pressuregaseousstatetoahigh-pressuregas.CondenserThecondenserisaseriesoftubeswithfinsattachedtothem,similartoaradiator.It'salwayssomewhereontheoutsideoftherefrigerator.Itmaybe:

*Alargeblackgridmountedtothebackoftherefrigerator

*Foldedandplacedundertherefrigerator

*Coiledupandplacednearthecompressor

*Integratedinthelineroftherefrigerator

Ifthecondenserisn'tabiggridonthebackoftherefrigerator,itwillalwayshaveacoolingfannearbytodrawroomairoverthetubesandfins--todissipatetheheatfromthetubesandfins.

Thehigh-pressurerefrigerantgas,comingfromthecompressor,flowsthroughthecondenserandbecomesaliquid.Asthisoccurs,therefrigerantgivesoffheat.Theheatisconductedawayfromthetubesbythefins.MeteringDevice（CapillaryTube）Themeteringdeviceinmosthouseholdrefrigeratorsisacapillarytube,atinycoppertube.Thecapillarytubeisattachedfromtheendofthecondensertothebeginningoftheevaporator.Thecapillarytubecontrolsthepressureandflowoftherefrigerantasitenterstheevaporator.

Oncetheliquidrefrigeranthastraveledthelengthofthecondenser,itisforcedthroughthecapillarytube.EvaporatorTheevaporatorisalwayslocatedontheinsideoftherefrigerator,usuallyinsidethefreezercompartment.Italsoresemblesaradiator.

Whentheliquidrefrigerantcomesoutofthesmallcapillarytube,it¡¯sinjectedintothelargertubesoftheevaporatorcausingapressuredrop.Thispressuredropallowstherefrigeranttoexpandbackintoagaseousstate.Thischangeofstatefromliquidtogasabsorbsheat.Thegaseousrefrigeranttravelsthroughtheevaporatortubes,backoutoftherefrigeratoranddowntothecompressortobeginthecirculationprocessagain.

Becausetheevaporatorisabsorbingheat,itisverycoldtothetouch.Thecoldnesscausesanyhumidityintheairtofreezeontheevaporatorasiceorfrost.（SeetheAutomaticdefrostsection）.Thefaninsidethefreezercompartmentcirculatestheairofboththerefrigeratorand/orfreezertokeepthetemperatureconstant.TemperaturecontrolAllrefrigeratorshaveathermostattomaintainthepropertemperature.Theseareusuallyverysimpledevices.Whentherefrigeratorreachesthesettemperature,thethermostatinterruptstheelectricityflowtothecompressor,whichstopscooling.LightingRefrigeratorswithinternallightingnormallyhaveonlyonefunctionalcomponent--theswitch--whichisusuallyawhitepush-buttonmountedinsidetherefrigeratornearthedoor.Whentherefrigeratordoorcloses,thedoorpushestheswitchtoturnthelightoff.Whenthedooropens,thebuttonautomaticallypopsbackouttoturnonthelight.Thelightbulbitselfisusuallyastandardappliancebulb.IcemakerTheicemakerisasmallappliancewithinafreezer.It'susuallyindependentoftheothersystemsoftherefrigerator.Icemakersystemshavetwobasicfunctionalcomponents:

theicemakeritself,andthewaterfillvalve.

Thisisthemostcommonicemakeroperationcycle:

*Theicemakersendsasignaltothewaterfillvalve（normallylocatedontheoutsidebackoftherefrigerator,nearthebottom）toopenandletwaterintotheicemakertray.Theamountofwaterisdeterminedbyacamandswitchwithintheicemakercontrolpanel.Theicemakersendsthesignaltoopenthewatervalveforacertainlengthoftime（7-10seconds）thenstopsthesignal.

*Theicemakerwaitsuntilthewaterisfrozen--whichitsenseswithasmallthermostatlocatednearthewatertray.Whenthetrayreachesapproximately10-15degreesFahrenheit,theicemakerbeginstoharvest（eject）thecubes.

*Toharvestthecubes,theicemakerfirstturnsonasmallheaterbeneaththetray.Theheaterwarmsthetrayslightly,whichallowstheicecubestomovefreely.

*Thenasweepforkrotatesandpushesthecubesupandoutofthetray.

*Whiletheicemakerisdumpingthecubesintoaholdingbin,ametalwiresimilartoacoathangerswingsuptoletthecubesdropbelowit.Whenthecubeshavedropped,thewirecomesbackdown.Iftheholdingbinisfullofice,thewirecannotcomeallthewaybackdown,whichstopsfurtherproductionofice.

*Whenthewireisallowedtocomebackdownalltheway,theicemakerrefillswithwaterandrepeatstheprocess.IceandwaterdispenserThereareseveraldifferentsystemsfordeliveringiceandwaterthroughtherefrigeratordoor.Whatfollowsisanexplanationofthecommonattributesofallofthesystems.IcedispenserForarefrigeratortoprovideicethroughthedoor,theicemakerfirstdumpstheiceitproducesintoalargebin.Torequesticeatthedoor,apersonpressesaleverthatactivatesaswitch.Theswitchturnsonamotorthatrotatestheauger.Whentheaugerrotates,itpushesiceoutofthebin,throughachutetotheuser.WaterdispenserThewaterdispenserworksmuchliketheicedispenser.Torequestwateratthedoor,apersonpressesaleveronthefrontoftherefrigeratorthatactivatesaswitch.Theswitchturnsonanelectricwatervalveatthebackoftherefrigerator.Waterflowsthroughthevalveintoatube,thenflowsintoacontainerintherefrigeratortobechilled.Asnewwaterentersthecontainer,thewaterthatisdisplacedflowsthroughaseparatetubetotheuser.DoorsealsandhingesAllrefrigerator/freezerdoorshaveaseal--arubber-likegasketattachedtothedoor.Usuallywhite,almond,black,orbrown,theseal'sjobistokeepthecoolairinsidetherefrigeratorandtheroomairout.

Thesealislinedwithamagnetthatrunsitslengthandwidth.Themagnethelpstoholdthedoorclosedandcreateatightseal.Thescrewsthatholdthesealtothedooralsoholdthedoorlinerinandhelpto"square"thedoor.

Thehingesallowthedoortoswingopen.Somehingesalsoassistthedoorinclosing.Forthedoortocloseproperly,thehingesmustbecorrectlyadjusted.InstallationProperinstallationofarefrigeratorisbotheasyandimportant.Theprimaryconcernsarethattheunithassufficientclearancefromthewallsforproperventilation,thatitisnotpinchinganyelectricalcordsorwaterlines,andthatitislevel.Manyrefrigeratorsmustbetiltedbackslightlysothatthedoorsself-close.Consultyourowner'smanualforfurtherinstallationinstructions.到这里

WHATISWRONGWITHYOURREFRIGERATOR?

Warning!

Toavoidpersonalinjuryorevendeath,alwaysdisconnectyourappliancefromitspowersource--thatis,unplugitorbreaktheconnectionatthecircuitbreakerorfusebox--beforeyoudoanytroubleshootingorrepairworkonyourappliance.Also,becausesomecomponentsmayhavesharpedges,usecautionwhileworkingonyourappliance.

Note:

Ifyourrepairproblemisn'tlisted,clickheretoemailtheRepairGuru.Hewillgiveyouthehelpyouneed.

It'sstoppedcompletelyFirst,checktoseeifthelightcomesonorifthereisanyfan,motor,orothersoundcomingfromtheappliance