Section 23 73 00INDOOR CENTRALSTATION AIRHANDLING UNITS.docx
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Section 23 73 00INDOOR CENTRALSTATION AIRHANDLING UNITS.docx
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Section237300INDOORCENTRALSTATIONAIRHANDLINGUNITS
SECTION237300
INDOORCENTRAL-STATIONAIR-HANDLINGUNITS
SPECWRITERNOTES:
1.Deletebetween////ifnotapplicabletoproject.Alsodeleteanyotheritemorparagraphnotapplicableinthesectionandrenumbertheparagraphs.
2.Referencestopressureinthissectionaregagepressureunlessotherwisenoted.
PART1GENERAL
1.1DESCRIPTION
A.Airhandlingunitsincludingintegralcomponentsspecifiedherein.
B.Definitions:
AirHandlingUnit(AHU):
Afactoryfabricatedandtestedassemblyofmodularsectionsconsistingof//housed-centrifugalfanwithV-beltdrive////singleormultipleplenumfanswithdirect-drive//,coils,filters,andothernecessaryequipmenttoperformoneormoreofthefollowingfunctionsofcirculating,cleaning,heating,cooling,humidifying,dehumidifying,andmixingofair.Designcapacitiesofunitsshallbeasscheduledonthedrawings.
1.2RELATEDWORK
//A.Seismicrestraintsforequipment:
Section130541,SEISMICRESTRAINTREQUIREMENTSFORNON-STRUCTURALCOMPONENTS.//
B.Generalmechanicalrequirementsanditems,whicharecommontomorethanonesectionofDivision23:
Section230511,COMMONWORKRESULTSFORHVACANDSTEAMGENERATION.
C.Soundandvibrationrequirements:
Section230541,NOISEANDVIBRATIONCONTROLFORHVACPIPINGANDEQUIPMENT.
D.Pipingandductinsulation:
Section230711,HVAC,PLUMBING,ANDBOILERPLANTINSULATION.
E.Pipingandvalves:
Section232113/232213,HYDRONICPIPING/STEAMANDCONDENSATEHEATINGPIPING.
F.Heatingandcoolingcoilsandpressurerequirements:
Section238216,AIRCOILS.
G.Returnandexhaustfans:
Section233400,HVACFANS.
H.Requirementsforflexibleductconnectors,soundattenuatorsandsoundabsorbingductlining,andairleakage:
Section233100,HVACDUCTSandCASINGS.
I.Airfiltersandfilters'efficiency:
Section234000,HVACAIRCLEANINGDEVICES.
J.HVACcontrols:
Section230923,DIRECT-DIGITALCONTROLSYSTEMFORHVAC.
K.Testing,adjustingandbalancingofairandwaterflows:
Section230593,TESTING,ADJUSTING,ANDBALANCINGFORHVAC.
L.Typesofmotors:
Section230512,GENERALMOTORREQUIREMENTSFORHVACANDSTEAMGENERATIONEQUIPMENT.
M.Typesofmotorstarters:
Section262911,LOW-VOLTAGEMOTORSTARTERS.
N.GeneralCommissioning:
Section019100,GENERALCOMMISSIONINGREQUIREMENTS
O.HVACCommissioning:
Section230800,COMMISSIONINGOFHVACSYSTEMS
1.3QUALITYASSURANCE
A.RefertoArticle,QualityAssurance,inSection230511,COMMONWORKRESULTSFORHVACANDSTEAMGENERATION.
B.AirHandlingUnitsCertification
1.AirHandlingUnitswithHousedCentrifugalFans:
TheairhandlingunitsshallbecertifiedinaccordancewithAHRI430andtested/ratedinaccordancewithAHRI260.
2.AirHandlingUnitswithPlenumFans:
a.AirHandlingUnitswithasinglePlenumFanshallbecertifiedinaccordancewithAHRI430andtested/ratedinaccordancewithAHRI260.
b.AirhandlingUnitswithMultipleFansinanArrayshallbetestedandratedinaccordancewithAHRI430andAHRI260.
C.Heating,Cooling,andAirHandlingCapacityandPerformanceStandards:
AHRI430,AHRI410,ASHRAE51,andAMCA210.
D.PerformanceCriteria:
1.ThefanBHPshallincludeallsystemeffectsforallfansandv-beltdrivelossesforhousedcentrifugalfans.
2.Thefanmotorshallbeselectedwithintheratednameplatecapacity,withoutrelyinguponNEMAStandardServiceFactor.
3.Selectthefanoperatingpointasfollows:
a.ForwardCurveandAxialFlowFans:
Righthandsideofpeakpressurepoint.
b.AirFoil,BackwardInclined,orTubularFansIncludingPlenumFans:
Atornearthepeakstaticefficiencybutatanappropriatedistancefromthestallline.
4.OperatingLimits:
AMCA99andManufacturer’sRecommendations.
E.Unitsshallbefactory-fabricated,assembled,andtestedbyamanufacturer,inbusinessofmanufacturingsimilarair-handlingunitsforatleastfive(5)years.
SPECWRITERSNOTES:
Forlargerprojectsinvolvingmorethanfiveairhandlingunits,theA/EshallselectafewtypicalAHUs,indifferentconfigurations,foraninitialsubmission.Thesuggesteddifferentconfigurationsare:
1.100percentoutsideairAHUswithorwithoutheatrecoverycoils.
2.Re-circulatingtypeofvariableairvolumeAHUswithminimumoutsideairandeconomizercyclefeatures.Theremainingsubmissionshallbereceivedonlyaftertheinitialsubmissionisapprovedwithsatisfactoryresolutionofallcommentsmadeduringthereviewandapprovalprocess.
1.4.SUBMITTALS:
A.Thecontractorshall,inaccordancewithSection013323,SHOPDRAWINGS,PRODUCTDATA,ANDSAMPLES,furnishacompletesubmissionforallairhandlingunitscoveredintheproject.Thesubmissionshallincludeallinformationlistedbelow.Partialandincompletesubmissionsshallberejectedwithoutreviews.
B.Manufacturer'sLiteratureandData:
1.SubmittalsforAHUsshallincludefans,drives,motors,coils,//humidifiers,//soundattenuators//,mixingboxwithoutside/returnairdampers,filterhousings,//blendersections//,andallotherrelatedaccessories.Thecontractorshallprovidecustomdrawingsshowingtotalairhandlingunitassemblyincludingdimensions,operatingweight,accesssections,//diffusionplates//,flexibleconnections,doorswings,controlspenetrations,electricaldisconnect,lights,duplexreceptacles,switches,wiring,utilityconnectionpoints,unitsupportsystem,vibrationisolators,drainpan,pressuredropsthrougheachcomponent(filter,coiletc).
2.Submittaldrawingsofsectionorcomponentonlywillnotbeacceptable.Contractorshallalsosubmitperformancedataincludingperformancetestresults,charts,curvesorcertifiedcomputerselectiondata;datasheets;fabricationandinsulationdetails.Iftheunitcannotbeshippedinonepiece,thecontractorshallindicatethenumberofpiecesthateachunitwillhavetobebrokenintotomeetshippingandjobsiteriggingrequirements.ThisdatashallbesubmittedinhardcopiesandinelectronicversioncompatibletoAutoCADversionusedbytheVAatthetimeofsubmission.
3.SubmitsoundpowerlevelsineachoctavebandfortheinletanddischargeofthefanandatentranceanddischargeofAHUsatscheduledconditions.InabsenceofsoundpowerratingsrefertoSection230541,NOISEANDVIBRATIONCONTROLFORHVACPIPINGANDEQUIPMENT.
4.ProvidefancurvesshowingLiters/Second(cubicfeetperminute),staticpressure,efficiency,andhorsepowerfordesignpointofoperationandatmaximumdesignLiters/Second(cubicfeetperminute).
5.Submittotalfanstaticpressure,externalstaticpressure,forAHUincludingtotal,inletanddischargepressures,anditemizedspecifiedinternallossesandunspecifiedinternallosses.Refertoairhandlingunitscheduleondrawings.
C.MaintenanceandoperatingmanualsinaccordancewithSection010000,GENERALREQUIREMENTS.Includeinstructionsforlubrication,filterreplacement,motoranddrivereplacement,sparepartlists,andwiringdiagrams.
D.Submitwrittentestprocedurestwoweekspriortofactorytesting.Submitwrittenresultsoffactorytestsforapprovalpriortoshipping.
E.Submitshippinginformationthatclearlyindicateshowtheunitswillbeshippedincompliancewiththedescriptionsbelow.
1.Unitsshallbeshippedinone
(1)piecewherepossibleandinshrinkwrappingtoprotecttheunitfromdirt,moistureand/orroadsalt.
2.Ifnotshippedinone
(1)piece,providemanufacturerapprovedshippingsplitswhererequiredforinstallationortomeetshippingand/orjobsiteriggingrequirementsinmodularsections.Indicateclearlythattheshippingsplitsshowninthesubmittalshavebeenverifiedtoaccommodatetheconstructionconstraintsforriggingasrequiredtocompleteinstallationandremovalofanysectionforreplacementthroughavailableaccesswithoutadverselyaffectingothersections.
3.Ifshippingsplitsareprovided,eachcomponentshallbeindividuallyshrinkwrappedtoprotecttheunitandallnecessaryhardware(e.g.bolts,gasketsetc.)willbeincludedtoassembleunitonsite(seesection2.1.A4).
4.Liftinglugswillbeprovidedtofacilitateriggingonshippingsplitsandjoiningofsegments.Iftheunitcannotbeshippedinonepiece,thecontractorshallindicatethenumberofpiecesthateachunitwillhavetobebrokenintotomeetshippingandjobsiteriggingrequirements.
1.5APPLICABLEPUBLICATIONS
A.Thepublicationslistedbelowformapartofthisspecificationtotheextentreferenced.Thepublicationsarereferencedinthetextbythebasicdesignationonly.
B.AirConditioning,Heating,andRefrigerationInstitute(AHRI)/(ARI):
41001StandardforForced-CirculationAir-HeatingandAir-CoolingCoils
43009CentralStationAirHandlingUnits
C.AirMovementandControlAssociationInternational,Inc.(AMCA):
21007LaboratoryMethodsofTestingFansforRating
D.AmericanSocietyofHeating,RefrigeratingandAir-conditioningEngineers,Inc.(ASHRAE):
170-2008VentilationofHealthCareFacilities
E.AmericanSocietyforTestingandMaterials(ASTM):
ASTMB117-07aStandardPracticeforOperatingSaltSpray(Fog)Apparatus
ASTMD165408StandardTestMethodforEvaluationofPaintedorCoatedSpecimensSubjectedtoCorrosiveEnvironments
ASTMD173508StandardPracticeforTestingWaterResistanceofCoatingsUsingWaterFogApparatus
ASTMD335908StandardTestMethodsforMeasuringAdhesionbyTapeTest
F.MilitarySpecifications(Mil.Spec.):
MIL-P-21035B-2003Paint,HighZincDustContent,GalvanizingRepair(Metric)
G.NationalFireProtectionAssociation(NFPA):
NFPA90AStandardforInstallationofAirConditioningandVentilatingSystems,2009
H.EnergyPolicyActof2005(P.L.109-
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