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COMBO WITH NATE HEAT PUMP
EXAM WITH ALL ANSWERS
Chargingnanheatnpumpnwithnrefrigerantnisnbestnaccomplishedninnthen_______nmode. nA:nHeatingnmode nB:nCoolingnmode nC:nDefrostnmode nD:nEmergencynheatingnmoden-nB:nCoolingnmode Heatnpumpsncannprovidenbothnheatingninnthenwinternandncoolingninnthensummer.nInnwhic hnmodenisnthenheatnpumpnmorenefficient? nA:nHeatingnmode nB:nCoolingnmode nC:nDefrostnmode nD:nEmergencynheatingnmoden-nA:nHeatingnmode Whichnofnthenfollowingncomponentsnisnexclusiventonthenheatnpump? nA:nCondenser nB:nOilnseparator nC:nReversingnvalve nD:nAccumulatorn-nC:nReversingnvalve Whichnofnthenfollowingnairflownratesnisnthenmostnreasonablenfornanheatnpumpnsystemnop eratingninnthenheatingncycle? nA:n 200 ncfmnpernton nB:n 300 ncfmnpernton nC:n 400 ncfmnpernton
nD:n 450 ncfmnperntonn-nD:n 450 ncfmnpernton Duringnthenheatnpump'sncoolingncycle,nthenoutdoorncoilnisnutilizednasnan_________nwhile nthenindoorncoilnisnutilizednasna____________. nA:nCondenser,nevaporator nB:nEvaporator,ncondenser nC:nCompressor,naccumulator nD:nAccumulator,ncondensern-nA:nCondenser,nevaporator Heatnisnpresentninnwinternoutdoornairnuntilnthenoutsidenairnambientntemperaturenreachesn anlowntemperaturenof: nA:n 0 ndegreesnF nB:n 32 ndegreesnF nC:n 273 ndegreesnF nD:n-459ndegreesnFn-nD:n-459ndegreesnF Technicallynthisnisntrue,nbutnnotnpractical.nAnheatnpumpnisndoingngoodntoncontinuentonwor knbelown 10 ndegnF. Thenheatnpumpnutilizes: nA:nTwonfilter-driersnwithnchecknvalves nB:nOnenbi-flownfilter-drier nC:nAnsinglenmono-flownfilter-drierninnthenliquidnline nD:nSomenusenthenbi-flownfilter-driernandnothersnusentwonfilter-driersnwithnchecknvalvesn- nD:nSomenusenthenbi-flow-nfilter-driernandnothersnusentwonfilter-driersnwithnchecknvalves Thencorrectnwayntonsizenanheatnpumpnisntonperformnbothnheatingnandncoolingnloadncalcul ationsnandnselectnthenheatnpumpnsizenby: nA:nAddingnthenheatingnloadnandncoolingnloads nB:nSubtractingnthensmallernloadnfromnthenlargernload nC:nUsingnthenheatingnloadntonsizenthensystem nD:nUsingnthencoolingnloadntonsizenthensystemn- nD:nUsingnthencoolingnloadntonsizenthensystem
nD:nThenpointnatnwhichnthenheatingnandncoolingnloadsnmeetn- nA:nThenlowestntemperaturenatnwhichnthenheatnpumpncannmeetnthenheatingnrequirementn fornthenstructure Whichnofnthenfollowingnisnannincorrectntermnfornthensolenoidnvalventhatnswitchesnthenheat npumpnbetweennthenheatingnandncoolingnmodes? nA:nChangeovernvalve nB:nReversingnvalve nC:nFour-waynvalve nD:nDischargenoperatornvalven-nD:nDischargenoperatornvalve Thenbestnlocationnfornthenoutdoornsectionnofnannairntonairnheatnpumpnis: nA:nWherenitngetsnthenwinternsun nB:nWherenitnisnshelterednfromnthensun'snradiation nC:nWherenitnnevernsnows nD:nUndernthenshelternofnanporchn-nA:nWherenitngetsnthenwinternsun Whatnmaynhappennifnthenbodynofnanreversingnvalvenisnslightlyndented? nA:nNothing,nasntheynarenmadentonbenveryndurable nB:nTheninternalnslidenmaynstick nC:nThenvalvenmaynmakennoisesnfromnthengasntryingntonpassnthroughnpartiallynopennport s nD:nBothnbnandncnarencorrectn-nD:nBothnbnandncnarencorrect Thenreversingnvalvenhasn 4 npipenconnections.nOnenpipenconnectionnisnonnonensidenofnthe nvalvenandnthreenpipenconnectionsnarenonnthenoppositenside.nWhatnisnthencenternconnect ionnonnthensidenwithnthreenpipenconnections? nA:nCompressornsuctionnconnection nB:nCompressorndischargenconnection nC:nOutdoorncoilnconnection nD:nIndoorncoilnconnectionn-nA:nCompressornsuctionnconnection Thenreversingnvalvenhasn 4 npipenconnections.nOnenpipenconnectionnisnonnonensidenofnthe nvalvenandnthreenpipenconnectionsnarenonnthenoppositenside.nWhatnisnthensinglenconnect ionnonnthensidenoppositenthenthreenconnections?
nA:nCompressornsuctionnconnection nB:nCompressorndischargenconnection nC:nOutdoorncoilnconnection nD:nIndoorncoilnconnectionn-nB:nCompressorndischargenconnection Whynarenreversingnvalvesnpilotnoperated? nA:nBecausenpilotnoperatednvalvesnusenthendifferentialnpressurentonoperatenthenvalvenpo rtsninsteadnofnhavingnansolenoidnvalvenworkingnagainstnthenheadnpressure nB:nBecausenthatnisnjustnthenwayntheynarenmade nC:nPilotnoperatednvalvesnarenquiet nD:nHeatnpumpnreversingnvalvesnarenNOTnpilotnoperated!n- nA:nBecausenpilotnoperatednvalvesnusenthendifferentialnpressurentonoperatenthenvalvenpo rtsninsteadnofnhavingnansolenoidnvalvenworkingnagainstnthenheadnpressure Twontechniciansnarenworkingnonnanheatnpumpnsystemnandnarenpreparingntonevacuatenth ensystem.nTechniciannAnsaysnthatninnorderntonpullnangoodnvacuumnthenreversingnvalvenn eedsntonbenswitchednonnandnoffnduringnthenevacuationnsonairnandnmoisturenarennotntrapp edninnthensystem.nTechniciannBnsaysntechniciannAnisnincorrectnandnthatnthenreversingnva lvenwillnnotnswitchnwithnthensystemninnanvacuumnanyway.nWhonisncorrect? nA:nTechniciannAnisncorrect nB:nTechniciannBnisncorrect nC:nBothntechniciansnAnandnBnarencorrect nD:nBothntechniciansnAnandnBnarenincorrectn-nB:nTechniciannBnisncorrect Terminaln"O"nonnanheatnpumpnthermostatnisnusednfor: nA:nOperatingnthenreversingnvalve nB:nOperatingnthenindoornfannmotor nC:nOperatingnthencompressor nD:nOperatingnthencondensernfannmotorn-nA:nOperatingnthenreversingnvalve Terminaln"G"nonnanheatnpumpnthermostatnisnusednfor: nA:nOperatingnthenreversingnvalve nB:nOperatingnthenindoornfannmotor nC:nOperatingnthencompressor nD:nOperatingnthencondensernfannmotorn-nB:nOperatingnthenindoornfannmotor
nA:nAnnaccumulator nB:nEvaporatornpressurenregulator nC:nElectronicnsuctionnthrottlingnvalve nD:nCrankcasenpressurenregulatorn-nA:nAnnaccumulator Compressorncrankcasenheatersnarenusednto: nA:nHelpndecreasenrefrigerantnmigration nB:nReducenthenpotentialnofnliquidnflood-back nC:nReducenthenpotentialnofnfloodednstarts nD:nBothnanandncnarencorrectn-nD:nBothnanandncnarencorrect Anheatnpumpnisnoperatingninnthenheatingnmode.nThenlowernthenoutsidenairntemperature,nt he: nA:nMorenefficientnthenheatnpumpnbecomes nB:nHighernthenSEERnrating nC:nHighernthencompressionnratio nD:nLowernthenbalancenpointn-nC:nHighernthencompressionnratio Whichnofnthenfollowingncannpreventnthenreversingnvalvenfromnchangingnpositions? nA:nLownrefrigerantncharge nB:nOverchargenofnrefrigerant nC:nAirninnthensystem nD:nLownindoornairflownduentonandirtynairnfiltern-nA:nLownrefrigerantncharge Thensupplynairntemperaturenonnannormallynoperatingnheatnpumpnis: nA:nLowernthannthatnofnangasnheatingnsystem nB:nHighernthannthatnofnangasnheatingnsystem nC:nAboutnthensamenasnthatnofnangasnheatingnsystem nD:nHeatnpumpsndonnotnusensupplynairn-nA:nLowernthannthatnofnangasnheatingnsystem
Whennanheatnpumpnisnoperatingninnthencoolingnmode,nthensuctionnlinenatnthencompresso rnshouldnfeeln_____nandnwhennoperatingninnthenheatingnmodenthensamensuctionnlinensho uldnfeeln_____. nA:nCool,nhot nB:nHot,ncool nC:nHot,nhot nD:nCool,ncooln-nD:nCool,ncool HighnSEERnratednheatnpumpsnarenthosenthatnemploy: nA:nScrollncompressorsnandnover-sizedncoils nB:nReciprocatingncompressorsnandnover-sizedncoils nC:nScrollncompressorsnandnaccumulators nD:nReciprocatingncompressorsnandnaccumulatorsn-nA:nScrollncompressorsnandnover- sizedncoils Whichnofnthenfollowingnmeteringndevicesncannimproventhenoperatingnefficiencynofnanheat npump? nA:nThermostaticnexpansionnvalve nB:nAutomaticnexpansionnvalve nC:nFixednorifice nD:nCapillaryntuben-nA:nThermostaticnexpansionnvalve Duringnthendefrostncyclenthenoutdoornfannmotornis: nA:nShutndown nB:nOperatednatnanreducednspeed nC:nSteppednupntonitsnhighestnspeed nD:nAllowedntonrunnatnitsnnormalnspeedn-nA:nShutndown Whichnofnthenfollowingncompressorsnisnmostn"liquidnslug"ntolerable? nA:nReciprocating nB:nScroll
nA:nOne nB:nTwo nC:nThree nD:nFourn-nC:nThree ThenUnitednStatesnDepartmentnofnEnergynhasnmandatednthatnthenminimumnallowablenS EERnratingnfornannewnresidentialnairnconditioningnsystemninstallationnis: nA:n 11 nSEER nB:n 12 nSEER nC:n 13 nSEER nD:n 14 nSEERn-nC:n 13 nSEER Whichnofnthenfollowingnactionsnwillnresultninnandecreaseninnvolumetricnefficiency? nA:nAnnincreaseninnheadnpressure nB:nAndecreaseninnheadnpressure nC:nAnnincreaseninnsuctionnpressure nD:nBothnanandncn-nA:nAnnincreaseninnheadnpressure Thisnisnthenrationofnthenactualndeliveredngasnvolumentonthensweptnvolumenorntotalndisplac ementnofnthencylinder.nThenactualnvolumenofngasninductedninsidenthencylindernforncompr essionnisnlessnthannthentheoreticalncalculatednvolumenbecausenofnthenclearancenvolume .nWhennthengasnisncompressed,nandnisndeliverednbynthendischargenvalve,nnotnallnthengasn isndischargednsincensomenvolumenofnthengasnremainsninsidenthenclearancenvolumenatnhi ghndischargenpressure.nWhennthenpistonnstartsnmovingndownwards,nthensuctionnvalvend oesnnotnopensnimmediatelynbecausenofnthisnhighnpressurengas.nAsnthenpistonnmovesndo wnwardsnthenpressurenofnthengasninnthenclearancenvolumenstartsnreducingnduentonexpan sion.nOnlynwhennthenpressurenofnthisngasnreachesntoncertainnminimumnlevel,nthensuction nvalvenopens.nThusnthenportionnofnthensuctionnstrokenofnthenpistonngoesnunusednandnduri ngnthisncertainnvolumenofnthenrefrigerantnisnnotnsucked.nThisnreducesnthenvolumenofnthenr efrigerantnthatncannbensuckednbynthencylindernornthencompressor. Readnmore:nhttp://www.brighthub.com/engineering/mechanical/articles/51998.aspx? p=2#ixzz14iyB2WTb Anheatnpumpnoperatingninnthencoolingnmodenwouldnbenexpectedntonhavenanreturn-to- supplynairntemperaturendifferentialninnthenrangenof: nA:n 5 nton 6 ndegrees
nB:n 5 nton 8 ndegrees nC:n 8 nton 12 ndegrees nD:n 18 nton 22 ndegreesn-nD:n 18 nton 22 ndegrees Anheatnpumpnoperatingnnormallyninnthenheatingnmodenwouldnbenexpectedntonhavenansup plynairntemperatureninnthenrangenof: nA:n 70 nton 80 ndegrees nB:n 80 nton 90 ndegrees nC:n 85 nton 105 ndegrees nD:n 100 nton 130 ndegreesn-nC:n 85 nton 105 ndegrees Innanyncase,nthencompressor'sndischargenlinentemperaturenshouldnnotnexceednwhatntem perature? nA:n 175 ndegreesnF nB:n 200 ndegreesnF nC:n 225 ndegreesnF nD:n 350 ndegreesnFn-nC:n 225 ndegreesnF Anheatnpumpndefrostsnevennwhenntherenisnnonicenonnthenoutsidencoil.nWhichnofnthenfollo wingnisnmostnlikelynthenproblem? nA:nThendefrostntimenclocknisnsetnforntoonshortnancycle nB:nThenoutdoorncoilnisndirtynandnthensystemnusesnanpressurendifferentialntypenofndefrostni nitiation nC:nThensensingnbulbnofnthendefrostncontrolnisnmountedntoonclosentonthenbottomnofnthenou tdoorncoil nD:nEachnofnthesencouldncausenthenproblemn-nD:nEachnofnthesencouldncausenthenproblem Antechniciannplacesnanheatnpumpnintonthenauxiliarynelectricnheatingnmodenwithnthencomp ressornde- energized.nHenmeasuresnantemperaturenrisenbetweennthenreturnnandnsupplynairnofn 40 nd egrees.nThenmeasurednvoltagenatnthenelectricnelementsnisnexactlyn 222 nvoltsnandnthenme asurednamperagenofnthenheatersnisn 60 namps.nUsingnthenequationnCFMn=nBTUndividednb yn1.08nxnTD,nwhatnisnthenCFMnofnthensystem? nA:n 825 nCFM
Anservicencallnisnmadenonnannair-to- airnheatnpumpnsystemnduringnthenwinternmonths.nThentechniciannarrivesnonnthenjobnandn noticesnthatnthendischargenpressurenisnlownandnthensuctionnpressurenisnhigh.nWhatntwon problemsncouldncausenthisnsymptom:n- nanleakingnreversingnvalvenandnbadncompressornvalves Howncannansystemnbentestedntondeterminenifnthenreversingnvalvensolenoidnisnleakingninte rnally:n- nAntemperaturenmeasurementncannbentakennatntheninletnandnthenoutletnofnthenvalveninnthe nheatingnandncoolingnmode Whatncomponentnmustnalwaysnbende- energizednduringnthendefrostncyclenonnanheatnpump:n-nthenoutdoornfan Whennannair-to- airnheatnpumpnisninnthencoolingnmode,nwhatncanncausenandecreaseninnhigh-sidenandnlow- sidenpressure:n-nanrestrictednindoornmeteringndevice TechniciannAnsaysnthatnthenchecknvalvesninnanheatnpumpnsystemnarenlocatedninnseriesnw ithnbothnmeteringndevices.nTechniciannBnsaysnthatnthenchecknvalvesninnanheatnpumpnsys temnarenlocatedninnparallelnwithnbothnmeteringndevices.nWhichntechniciannisncorrect:n- nBothntechniciansnarencorrect Anservicentechniciannnoticesnthatnanchecknvalvenneedsntonbenreplacedninnanheatnpumpns ystem.nBecausenitnisnanball-typenchecknvalve,nitnisncriticalnfornhimntoninstallnthenvalve:n- nvertically,nwithnthenseatnonnthenbottomnofnthenvalve Afterntroubleshootingnanheatnpumpnsystem,nthentechniciannconcludesnthatnthenchecknval venisndefective.nHenconnectsnanrecoverynsystemnandnremovesnthenrefrigerantnfromnthenu nit.nHenthennproceedsntonunseatnthenoldnchecknvalvenandnremovenitnfromnthensystem.nHe ncleansnthenareanwherenthennewnvalvenwillnbeninstalled,nplacesnitnintonposition,nandnbraz esnitnintonthensystemnwhilennotnprotectingnthenvalve.nAfternanthoroughnevacuation,nhensta rtsnthensystemnandnnoticesnthatnthennewnvalvenisndefective.nWhatncouldnhavenbeennthenp roblemnwithnthennewnvalve:n- nAnheatnsinknwasnnotnusednandnthenvalvenwarped+Thenvalvenmaynhavenbeenndefectivenf romnthenfactory+Thenproblemnwasnmisdiagnosed TechniciannAnsaysnthatnthenauxiliarynheatersnfoundnonnannair-to- airnheatnpumpnarenusedntonincreasenthensystem'snpressurenduringnandefrostncycle.nTech niciannBnsaysnthatnthenauxiliarynheatersnfoundnonnannair-to- airnheatnpumpnarenusedntonincreasensupply- airntemperaturenforncomfortnduringnandefrostncycle.nWhichntechniciannisncorrect:n- ntechniciannB Whennanheatnpumpnswitchesnintonthendefrostncycle,nitnmust:n- nremainninndefrostnuntilnthenoutdoorncoilnhasnreachednanpredeterminedntemperature Andefrostnterminationnthermostatnisncommonlynlocated:n- nonnthenoutdoorncoil,nandnopensnatn55°nF
Temperaturensplitnrefersnto:n- nthentemperaturendifferencenbetweennthenairnenteringnancoilnandnthentemperaturenofnthen coil TechniciannAnsaysnthatnthenoutdoornambientnthermostatncommonlynde- energizesnthencompressornduringnthensecondnstagenofnheatingninnannair-to- airnheatnpump.nTechniciannBnsaysnthatnthenoutdoornambientnthermostatnusednwithnannair -to- airnheatnpumpncommonlynenergizesnthenauxiliarynstripnheatersnduringnthenfirstnstagenofn heating.nWhichntechniciannisncorrect:n-nBothntechniciansnarenincorrect Ifntherenisnmalfunctionninnanhold-backnthermostatnthatnisnusednwithnannair-to- airnheatnpump,nhownwouldnthisnaffectnthensystem:n- nThensystemnwouldnnotnstaynenergizednduringndefrostnifnthenroomnthermostatnisnsatisfied .nThisncouldncausenfreezingnofnthenoutdoorncoil. Antechniciannarrivesnonnanservicencallnfornannair-to- airnheatnpumpnduringnthenheatingnseason.nShennoticesnthatnthensystemnoperatesnnorma llynuntilnthendefrostncircuitnisnenergized.nThensystemnstaysninndefrostnfornapproximatelyn 1 5 nminnwhenntherenisnnonicenornfrostnbuildupnonnthencoil.nWhatncouldnbenthenproblemnwithn thensystem:n-nThendefrostnterminationnswitchnisnstucknclosed Antechniciannreceivesnanservicencallnfornannair-to- airnheatnpump.nThencustomernisncomplainingnaboutninsufficientnheatnduringnlownambient nconditions.nUponnarrivalntonthenjob,nthentechniciannnoticesnthatnthenmechanicalnheatnpu mpnsystemnisnoperatingnproperlynbutnthenauxiliarynheatnisnnotnoperating.nWhatncircuitnsh ouldnbencheckednnext:n-nthensecond-stagenheatingncircuit Antechniciannarrivesnatnanhomenonnanservicencallnfornannair-to- airnheatnpump.nAfternmeasuringnthenairntemperaturenovernthenindoorncoilnandnfindingnant emperaturenrisenofn35°nF,nhendeterminesnthat:n-nthentemperaturenrisenisnsufficient Whatnarensymptomsnofnannair-to- airnheatnpumpnsystemnthatnhasnanlownchargenwhenninnthencoolingnmode:n-nThenlow- sidenpressurenwillndecreasenandnthenindoorncoilnwillnbenpartiallynfrosted Ancustomerncallsnandnsaysnthatnhernair-to- airnheatnpumpnsystemnisnnotncoolingnproperly.nUponnarrival,nantechniciannnoticesnthatnth ensuctionnlinenandncompressornhasnfrostnbuildup.nTechniciannAnsaysnthatnthenproblemnis nprobablynanlowncharge.nTechniciannBnsaysnthatnitnisnpossiblynandirtynairnfilter.nWhichntec hniciannisnmorenlikelyntonbencorrect:n-ntechniciannB Namentwonsymptomsnthatnarencommonntonannover-chargednair-to- airnheatnpumpnsystemnwithnansystemnthatnhasnandirtyncondenser.n- nThendischargenpressurenincreasesnandnthenamperagenincreases Whennannair-to- airnheatnpumpnsystemnhasnannundercharge,nwhatnhappensntonthensuperheatnandnthensu bcoolingnofnthensystem:n-nThensuperheatnincreasesnandnthensubcoolingndecreases
Whennspeakingntonancustomernofnanheatnpumpninstallation,nyounshouldnalsoninformnhimnt hatntonconservenelectricitynhenshould:n-nclosenoffndampersntonroomsnnotnused Innorderntonaddncoolingnefficiency,nanfanndelaynmaynbenusednto:n- nstartnthenindoornmotornafterncompressornstart-up An 12 nXn 8 nreturn-airnductnhasnbeenninstalledntonan3- tonnheatnpumpnsystem.nWhatnwillnbenthenmostnlikelynresultnwhilenoperatingninnthenheatin gnmode:n-nshutdownnonnhigh-pressurencontrol Chargingnanheatnpumpnwithnrefrigerantnisnbestnaccomplishedninnthen_______nmode. nA:nHeatingnmode nB:nCoolingnmode nC:nDefrostnmode nD:nEmergencynheatingnmoden-nB:nCoolingnmode Heatnpumpsncannprovidenbothnheatingninnthenwinternandncoolingninnthensummer.nInnwhic hnmodenisnthenheatnpumpnmorenefficient? nA:nHeatingnmode nB:nCoolingnmode nC:nDefrostnmode nD:nEmergencynheatingnmoden-nA:nHeatingnmode Whichnofnthenfollowingncomponentsnisnexclusiventonthenheatnpump? nA:nCondenser nB:nOilnseparator nC:nReversingnvalve nD:nAccumulatorn-nC:nReversingnvalve Whichnofnthenfollowingnairflownratesnisnthenmostnreasonablenfornanheatnpumpnsystemnop eratingninnthenheatingncycle? nA:n 200 ncfmnpernton nB:n 300 ncfmnpernton nC:n 400 ncfmnpernton
nD:n 450 ncfmnperntonn-nD:n 450 ncfmnpernton Duringnthenheatnpump'sncoolingncycle,nthenoutdoorncoilnisnutilizednasnan_________nwhile nthenindoorncoilnisnutilizednasna____________. nA:nCondenser,nevaporator nB:nEvaporator,ncondenser nC:nCompressor,naccumulator nD:nAccumulator,ncondensern-nA:nCondenser,nevaporator Heatnisnpresentninnwinternoutdoornairnuntilnthenoutsidenairnambientntemperaturenreachesn anlowntemperaturenof: nA:n 0 ndegreesnF nB:n 32 ndegreesnF nC:n 273 ndegreesnF nD:n-459ndegreesnFn-nD:n-459ndegreesnF Technicallynthisnisntrue,nbutnnotnpractical.nAnheatnpumpnisndoingngoodntoncontinuentonwor knbelown 10 ndegnF. Thenheatnpumpnutilizes: nA:nTwonfilter-driersnwithnchecknvalves nB:nOnenbi-flownfilter-drier nC:nAnsinglenmono-flownfilter-drierninnthenliquidnline nD:nSomenusenthenbi-flownfilter-driernandnothersnusentwonfilter-driersnwithnchecknvalvesn- nD:nSomenusenthenbi-flow-nfilter-driernandnothersnusentwonfilter-driersnwithnchecknvalves Thencorrectnwayntonsizenanheatnpumpnisntonperformnbothnheatingnandncoolingnloadncalcul ationsnandnselectnthenheatnpumpnsizenby: nA:nAddingnthenheatingnloadnandncoolingnloads nB:nSubtractingnthensmallernloadnfromnthenlargernload nC:nUsingnthenheatingnloadntonsizenthensystem nD:nUsingnthencoolingnloadntonsizenthensystemn- nD:nUsingnthencoolingnloadntonsizenthensystem
nD:nThenpointnatnwhichnthenheatingnandncoolingnloadsnmeetn- nA:nThenlowestntemperaturenatnwhichnthenheatnpumpncannmeetnthenheatingnrequirementn fornthenstructure Whichnofnthenfollowingnisnannincorrectntermnfornthensolenoidnvalventhatnswitchesnthenheat npumpnbetweennthenheatingnandncoolingnmodes? nA:nChangeovernvalve nB:nReversingnvalve nC:nFour-waynvalve nD:nDischargenoperatornvalven-nD:nDischargenoperatornvalve Thenbestnlocationnfornthenoutdoornsectionnofnannairntonairnheatnpumpnis: nA:nWherenitngetsnthenwinternsun nB:nWherenitnisnshelterednfromnthensun'snradiation nC:nWherenitnnevernsnows nD:nUndernthenshelternofnanporchn-nA:nWherenitngetsnthenwinternsun Whatnmaynhappennifnthenbodynofnanreversingnvalvenisnslightlyndented? nA:nNothing,nasntheynarenmadentonbenveryndurable nB:nTheninternalnslidenmaynstick nC:nThenvalvenmaynmakennoisesnfromnthengasntryingntonpassnthroughnpartiallynopennport s nD:nBothnbnandncnarencorrectn-nD:nBothnbnandncnarencorrect Thenreversingnvalvenhasn 4 npipenconnections.nOnenpipenconnectionnisnonnonensidenofnthe nvalvenandnthreenpipenconnectionsnarenonnthenoppositenside.nWhatnisnthencenternconnect ionnonnthensidenwithnthreenpipenconnections? nA:nCompressornsuctionnconnection nB:nCompressorndischargenconnection nC:nOutdoorncoilnconnection nD:nIndoorncoilnconnectionn-nA:nCompressornsuctionnconnection Thenreversingnvalvenhasn 4 npipenconnections.nOnenpipenconnectionnisnonnonensidenofnthe nvalvenandnthreenpipenconnectionsnarenonnthenoppositenside.nWhatnisnthensinglenconnect ionnonnthensidenoppositenthenthreenconnections?
nA:nCompressornsuctionnconnection nB:nCompressorndischargenconnection nC:nOutdoorncoilnconnection nD:nIndoorncoilnconnectionn-nB:nCompressorndischargenconnection Whynarenreversingnvalvesnpilotnoperated? nA:nBecausenpilotnoperatednvalvesnusenthendifferentialnpressurentonoperatenthenvalvenpo rtsninsteadnofnhavingnansolenoidnvalvenworkingnagainstnthenheadnpressure nB:nBecausenthatnisnjustnthenwayntheynarenmade nC:nPilotnoperatednvalvesnarenquiet nD:nHeatnpumpnreversingnvalvesnarenNOTnpilotnoperated!n- nA:nBecausenpilotnoperatednvalvesnusenthendifferentialnpressurentonoperatenthenvalvenpo rtsninsteadnofnhavingnansolenoidnvalvenworkingnagainstnthenheadnpressure Twontechniciansnarenworkingnonnanheatnpumpnsystemnandnarenpreparingntonevacuatenth ensystem.nTechniciannAnsaysnthatninnorderntonpullnangoodnvacuumnthenreversingnvalvenn eedsntonbenswitchednonnandnoffnduringnthenevacuationnsonairnandnmoisturenarennotntrapp edninnthensystem.nTechniciannBnsaysntechniciannAnisnincorrectnandnthatnthenreversingnva lvenwillnnotnswitchnwithnthensystemninnanvacuumnanyway.nWhonisncorrect? nA:nTechniciannAnisncorrect nB:nTechniciannBnisncorrect nC:nBothntechniciansnAnandnBnarencorrect nD:nBothntechniciansnAnandnBnarenincorrectn-nB:nTechniciannBnisncorrect Terminaln"O"nonnanheatnpumpnthermostatnisnusednfor: nA:nOperatingnthenreversingnvalve nB:nOperatingnthenindoornfannmotor nC:nOperatingnthencompressor nD:nOperatingnthencondensernfannmotorn-nA:nOperatingnthenreversingnvalve Terminaln"G"nonnanheatnpumpnthermostatnisnusednfor: nA:nOperatingnthenreversingnvalve nB:nOperatingnthenindoornfannmotor nC:nOperatingnthencompressor nD:nOperatingnthencondensernfannmotorn-nB:nOperatingnthenindoornfannmotor
