Noteaboutthisspecification: Thesespecificationsarewrittenin“Masterformat”aspublishedbytheConstructionSpecificationInstitute.Pleasefeelfree tocopythisspecificationdirectlyintoyourbuildingspec.
WeatherMaker®
Gasheat/electriccoolingpackagedrooftop
HVACguidespecifications
Size range: 15, 17.5, 20, 25, 27.5 Nominal Tons
Carrier Model Number: 48TC-17-30
Part 1—(23 06 80) Schedulesfordecentralized
HVACequipment
1.01 (23 06 80.13) DecentralizedUnitaryHVACEquipmentSchedule
A. (23 06 80.13.A) Rooftopunit(RTU) schedule
1. Scheduleispertheprojectspecificationrequirements.
Part 2—(23 07 16) HVACequipmentinsulation
2.01 (230716.13) Decentralized,RooftopUnits:
A. (230716.13.A.) Evaporatorfancompartment:
1. Interiorcabinetsurfacesshallbeinsulatedwithaminimum1/2-in.thick,minimum11/2-lbdensity,flexiblefiberglassinsulationbondedwithaphenolicbinder,neoprenecoatedontheairside.
2. InsulationandadhesiveshallmeetNFPA90Arequirementsforflamespreadandsmokegeneration.
3. Unitinternalinsulationliningsshallberesistanttomoldgrowthinaccordancewith“moldgrowthandhumidity” testinASTMC1338,G21,andUL181orcomparabletestmethod.Airstreamsurfacesshallbeevaluatedin accordancewiththe“ErosionTest”inUL181,aspartofASTMC1071.
B. (230716.13.B.) Gasheatcompartment:
1. Aluminumfoil-facedfiberglassinsulationshallbeused.
2. InsulationandadhesiveshallmeetNFPA90Arequirementsforflamespreadandsmokegeneration.
Part 3—(23 09 23) InstrumentationandcontroldevicesforHVAC
3.01 (23 09 12.13) SensorsandTransmitters
A. (23 09 12.13.A.) Thermostats:
1. Thermostatmust
a. energizeboth“W”and“G”whencallingforheat.
b. havecapabilitytoenergize2differentstagesofcooling,and2differentstagesofheating.
c. includecapabilityforoccupancyscheduling.
* LonWorks is a registered trademark of Echelon Corporation.
Part 4—(23 09 23) Direct-digitalcontrolsystemforHVAC
4.01 (23 09 23.13) Decentralized,RooftopUnits:
A. (23 09 23.13.A.) PremierLink™controller (not compatible with SAV models):
1. ShallbeASHRAE62compliant.
2. Shallaccept18-32VACinputpower.
3. Shallhaveanoperatingtemperaturerangefrom–40°F(–40°C)to158°F(70°C),10%to95%RH(non-condensing).
4. Shallincludeanintegratedeconomizercontrollertosupportaneconomizerwith4to20mAactuatorinputand nomicroprocessorcontroller.
5. Controllershallacceptthefollowinginputs:spacetemperature,setpointadjustment,outdoorairtemperature, indoorairquality,outdoorairquality,indoorrelativehumidity,compressorlock-out,fireshutdown,enthalpy,fanstatus,remotetimeclock/doorswitch.
6. ShallacceptaCO2sensorintheconditionedspace,andbeDemandControlledVentilation(DCV)ready.
7. Shallprovidethefollowingoutputs:economizer,fan,coolingstage1,coolingstage2,heatstage1,heatstage2,heatstage3/exhaust/reversingvalve/dehumidify/occupied.
8. Unitshallprovidesurgeprotectionforthecontrollerthroughacircuitbreaker.
9. ShallbeInternetcapable,andcommunicateataBaudrateof38.4Korfaster.
10. ShallhaveanLEDdisplayindependentlyshowingthestatusofactivityonthecommunicationbus,andprocessor operation.
11. ShallincludeanEIA-485protocolcommunicationport,anaccessportforconnectionofeitheracomputerora Carriertechniciantool,anEIA-485portfornetworkcommunicationtointelligentspacesensorsanddisplays, andaporttoconnectanoptionalLonWorks*plug-incommunicationscard.
12. Shallhavebuilt-inCarrierComfortNetwork®(CCN)protocol,andbecompatiblewithotherCCNdevices,includingComfortVIEWcontrollers.
13. Shallhavebuilt-insupportforCarriertechniciantool.
14. Softwareupgradeswillbeaccomplishedbylocaldownload.Softwareupgradesthroughchipreplacementsare notallowed.
15. Shallbeshockresistantinallplanesto5Gpeak,11msduringoperation,and100Gpeak,11msduringstorage.
16. Shallbevibrationresistantinallplanesto1.5Gat20-300Hz.
17. Shallsupportabuslengthof4000ft(1219m) max,60devicesper1000ft(305m)section,and1RS-485repeaterper1000ft(305m)sections.
B. (23 09 23.13.B.) RTUOpen multi-protocol,directdigitalcontroller:
1. ShallbeASHRAE62compliant.
2. RTU Open controls meets California Title 24 Section 120.2i, ASHRAE 90.1-2016 and IECC*-2015 Fault Detection and Diagnostic (FDD) requirements.
3. Shallaccept18-30VAC,50-60Hz,andconsume15VAorlesspower.
4. Shallhaveanoperatingtemperaturerangefrom-40°F(-40°C)to130°F(54°C),10%to90%RH(non-condensing).
5. Shallincludebuilt-inprotocolforBACnet†(MS/TPandPTPmodes),Modbus**(RTUandASCII),JohnsonN2andLonWorks.LonWorksEchelonprocessorrequiredforallLonapplicationsshallbecontainedinseparatecommunicationboard.
6. Shallallowaccessofupto62networkvariables(SNVT).Shallbecompatiblewithallopencontrollers.
7. Baudratecontrollershallbeselectableusingadip switch.
8. ShallhaveanLEDdisplayindependentlyshowingthestatusofserialcommunication,running,errors,power,alldigitaloutputs,andallanaloginputs.
9. Shallacceptthefollowinginputs:spacetemperature,setpointadjustment,outdoorairtemperature,indoorair quality,outdoorairquality,compressorlock-out,fireshutdown,enthalpyswitch,andfanstatus/filterstatus/humidity/remoteoccupancy.
10. Shallprovidethefollowingoutputs:economizer,fan,coolingstage1,coolingstage2,heatstage1,heatstage2,heatstage3/exhaust/reversingvalve.
11. Shall have built-in surge protection circuitry through solid-state polyswitches. Polyswitches shall be used on incoming power and network connections. Polyswitches will return to normal when the “trip” condition clears.
12. Shallhaveabatterybackupcapableofaminimumof10,000hoursofdataandtimeclockretentionduring poweroutages.
13. Shallhavebuilt-insupportforCarriertechniciantool.
14. ShallincludeanEIA-485protocolcommunicationport,anaccessportforconnectionofeitheracomputerora Carriertechniciantool,anEIA-485portfornetworkcommunicationtointelligentspacesensorsanddisplays, andaporttoconnectanoptionalLonWorkscommunicationscard.
15. Softwareupgradeswillbeaccomplishedbyeitherlocalorremotedownload.Nosoftwareupgradesthroughchip replacementsareallowed.
Part 5—(23 09 33) Electric and electronic control system for HVAC
5.01 (23 09 33.13) Decentralized, rooftop units
A. (23 09 33.13.A.) General:
1. Shallbecompletewithself-containedlow-voltagecontrolcircuitprotectedbyaresettablecircuitbreakeronthe 24-vtransformerside.Transformershallhave75VAcapability.
2. Shallutilizecolor-codedwiring.
3. Shallincludeacentralcontrolterminalboardtoconvenientlyandsafelyprovideconnectionpointsforvital controlfunctionssuchas:smokedetectors,phasemonitor,gascontroller,economizer,thermostat,DDCcontroloptions,andlowandhighpressureswitches.
4. Theheatexchangershallbecontrolledbyanintegratedgascontroller(IGC)microprocessor.Seeheatexchangersectionofthisspecification.
5. Unitshallincludeaminimumofone8-pinscrewterminalconnectionboardforconnectionofcontrolwiring.
B. (23 09 33.13.B.) Safeties:
1. Compressorover-temperature,over-current.Highinternalpressuredifferential.
2. Low-pressureswitch.
a. Unitsshallhavedifferentsizedconnectorsforthecircuit1andcircuit2lowandhighpressureswitches.Theyshallphysicallypreventthecross-wiringofthesafetyswitchesbetweencircuits1and2.
b. Low-pressureswitchshallusedifferentcolorwirethanthehigh-pressureswitch.Thepurposeistoassisttheinstallerandservicetechniciantocorrectlywireandortroubleshoottherooftopunit.
3. High-pressureswitch.
a. Unitsshallhavedifferentsizedconnectorsforthecircuit1andcircuit2lowandhigh-pressureswitches.Theyshallphysicallypreventthecross-wiringofthesafetyswitchesbetweencircuits1and2.
b. High-pressureswitchshallusedifferentcolorwirethanthelow-pressureswitch.Thepurposeistoassisttheinstallerandservicetechniciantocorrectlywireandortroubleshoottherooftopunit.
* IECC is a registered trademark of International Code Council, Inc.
† BACnet is a registered trademark of ASHRAE (American Society of Heating, Refrigerating and Air-Conditioning Engineers).
** Modbus is a registered trademark of Schneider Electric.
4. Automaticreset,motorthermaloverload
protector.
5. Heatingsectionshallbeprovidedwiththe
followingminimumprotections:
a. High-temperaturelimitswitches.
b. Induceddraftmotorspeedsensor.
c. Flameroll-outswitch.
d. Flameprovingcontrols.
Part 6—(23 09 93) SequenceofoperationsforHVACcontrols
6.01 (23 09 93 13) Decentralized,RooftopUnits:
A. (23 09 93 13.A.) INSERTSEQUENCEOF
OPERATION
Part 7—(23 40 13) Panelairfilters
7.01 (23 40 13.13) Decentralizedrooftopunits:
A. (23 40.13.13.A.) Standardfiltersection:
1. Shallconsistoffactory-installed,lowvelocity,disposable2-in.thickfiberglassfiltersofcommerciallyavailablesizes.
2. Unitshalluseonlyonefiltersize.Multiplesizesarenotacceptable.
3. Filtersshallbeaccessiblethroughadedicated,weathertightaccesspanel.
4. 4-in.filtercapabilitiesshallbecapablewithpre-engineeredandapprovedCarrierfiltertrackfield-installedaccessory.Thiskitrequiresfieldfurnishedfilters.
Part 8—(23 81 19) Self-containedairconditioners
8.01 (23 81 19.13) Medium-CapacitySelf-ContainedAirConditioners(48TC**17-30)
A. (23 81 19.13.A.) General:
1. Outdoor, rooftop mounted, electrically controlled,heating andcooling unit utilizing a fully hermetic scrollcompressor(s)forcoolingdutyandgas combustion for heatingduty.
2. Factoryassembled,single-pieceheatingandcoolingrooftopunit.Containedwithintheunitenclosureshallbe allfactorywiring,piping,controls,andspecialfeaturesrequiredpriortofieldstart-up.
3. UnitshallusePuron®refrigerant.
4. Unitshallbeinstalledinaccordancewiththemanufacturer’sinstructions.
5. Unitmustbeselectedandinstalledincompliancewithlocal,state,andfederalcodes.
B. (23 81 19.13.B.)QualityAssurance
1. Unitmeets Department of Energy-2018, ASHRAE 90.1-2016 and IECC-2015 minimumefficiencyrequirements.
2. UnitshallberatedinaccordancewithAHRIStandard340/360.
3. UnitshallbedesignedtoconformtoASHRAE15.
4. UnitshallbeETL-testedandcertifiedinaccordancewithANSIZ21.47StandardsandETL-listedandcertified underCanadianstandardsasatotalpackageforsafetyrequirements.
5. InsulationandadhesiveshallmeetNFPA90Arequirementsforflamespreadandsmokegeneration.
6. Unitinternalinsulationliningsshallberesistanttomoldgrowthinaccordancewith“moldgrowthandhumidity” testinASTMC1338,G21,andUL181orcomparabletestmethod.Airstreamsurfacesshallbeevaluatedin accordancewiththe“ErosionTest”inUL181,aspartofASTMC1071.
7. Unitcasingshallbecapableofwithstanding500-hoursaltsprayexposureperASTMB117(scribedspecimen).
8. RoofcurbshallbedesignedtoconformtoNRCAStandards.
9. Unitshallbesubjectedtoacompletelyautomatedruntestontheassemblyline.Thedataforeachunitwillbe storedatthefactory,andmustbeavailableuponrequest.
10. UnitshallbedesignedinaccordancewithULStandard1995,ETLlistedincludingtestedtowithstandrain.
11. Unitshallbeconstructedtopreventintrusionofsnowandtestedtopreventsnowintrusionintothecontrolbox upto40mph.
12. Unitshaketestedtoassurancelevel1,ASTMD4169toensureshippingreliability.
13. HighEfficiencyMotorslistedshallmeetsection313oftheEnergyIndependenceandSecurityActof2007(EISA2007).
C. (23 81 19.13.C.)Delivery,storage,andhandling:
1. Unitshallbestoredandhandledpermanufacturer’srecommendations.
2. Liftedbycranerequireseithershippingtoppanelorspreaderbars.
3. Unitshallonlybestoredorpositionedintheuprightposition.
D. (23 81 19.13.D.)Projectconditions:
1. Asspecifiedinthecontract.
E. (23 81 19.13.E.)Operatingcharacteristics:
1. Unitshallbecapableofstartingandrunningat115F(46C)ambientoutdoortemperature,meetingmaximumloadcriteriaofAHRIStandard340/360at±10%voltage.
2. Compressorwithstandardcontrolsshallbecapableofoperationdownto30°F(–1°C),ambientoutdoortemperatures.Accessorywinterstartkitisnecessaryifmechanicallycoolingatambienttemperaturesbelow 30°F (–1°C).
3. Unitshalldischargesupplyairverticallyasshownoncontractdrawings.
4. Unitshallbefactoryconfiguredandorderedforverticalsupplyandreturnconfigurations.
5. Unitshallbefactoryfurnishedforverticalconfiguration.Nofieldconversionisrequired.
F. (23 81 19.13.F.)ElectricalRequirements:
1. Mainpowersupplyvoltage,phase,andfrequencymustmatchthoserequiredbythemanufacturer.
G. (23 81 19.13.G.)Unitcabinet:
1. Unitcabinetshallbeconstructedofgalvanizedsteel,andshallbebonderizedandcoatedwithapre-painted bakedenamelfinishonallexternallyexposedsurfaces.
2. Unitcabinetexteriorpaintshallbe:filmthickness,(dry)0.003inchesminimum,gloss(perASTMD523,60°F/16°C):60,Hardness:H to 2HPencilhardness.
3. EvaporatorfancompartmentinteriorcabinetinsulationshallconformtoAHRIStandard340/360minimum exteriorsweatcriteria.Interiorsurfacesshallbeinsulatedwithaminimum1/2-in.thick,1-lbdensity,flexiblefiberglassinsulation,neoprenecoatedontheairside.Aluminumfoil-facedfiberglassinsulationshallbeusedinthegasheatcompartment.
4. Unitinternalinsulationliningsshallberesistanttomoldgrowthinaccordancewith“moldgrowthandhumidity” testinASTMC1338,G21,andUL181orcomparabletestmethod.Airstreamsurfacesshallbeevaluatedin accordancewiththe“ErosionTest”inUL181,aspartofASTMC1071.
5. Baseofunitshallhaveaminimumoffourlocationsforthru-the-basegasandelectricalconnectionsstandard. Bothgasandelectricconnectionsshallbeinternaltothecabinettoprotectfromenvironmentalissues.
6. Baserail:
a. Unitshallhavebaserailsonaminimumof2sides.
b. Holesshallbeprovidedinthebaserailsforriggingshacklestofacilitatemaneuveringandoverhead rigging.
c. Holesshallbeprovidedinthebaserailformovingtherooftopbyforktruck.
d. Baserailshallbeaminimumof16-gaugethickness.
7. Condensatepanandconnections:
a. Shallbeaslopedcondensatedrainpanmadeofanon-corrosivematerial.
b. ShallcomplywithASHRAEStandard62.
c. Shallusea3/4-in.-14NPTdrainconnection,throughthesideofthedrainpan.Connectionshallbemade permanufacturer’srecommendations.
8. Toppanel:
a. Shallbeamulti-piecetoppanellinkedwithwatertightflangesandlockingsystems.
9. Gasconnections:
a. Allgaspipingconnectingtounitgasvalveshallentertheunitcabinetatasinglelocationonsideofunit (verticalplane).
b. Thru-the-basecapability
1) Standardunitshallhaveathru-the-basegas-linelocationusingaraised,embossedportionoftheunit basepan.
2) Thru-the-baseprovisions / connectionsareavailableasstandardwitheveryunit.Whenbottomconnectionsarerequired,fieldfurnishedcouplingsarerequired.
3) Nobasepanpenetration,otherthanthoseauthorizedbythemanufacturer,ispermitted.
10. Electricalconnections:
a. Allunitpowerwiringshallenterunitcabinetatasingle,factory-prepared,knockoutlocation.
b. Thru-the-basecapability.
1) Thru-the-baseprovisions/connectionsareavailableasstandardwitheveryunit.Whenbottomconnectionsarerequired,fieldfurnishedcouplingsarerequired.
2) Nobasepanpenetration,otherthanthoseauthorizedbythemanufacturer,ispermitted.
11. Componentaccesspanels(standard):
a. Cabinetpanelsshallbeeasilyremovableforservicing.
b. Unitshallhaveonefactory-installed,removable,filteraccesspanel.
c. Panelscoveringcontrolboxandfiltershallhavemoldedcompositehandleswhilethebloweraccessdoor shallhaveanintegratedflangeforeasyremoval.
d. HandlesshallbeUVmodified,composite.Theyshallbepermanentlyattached,andrecessedintothepanel.
e. Screwsontheverticalportionofallremovableaccesspanelshallengageintoheatresistant,molded compositecollars.
f. Collarsshallberemovableandeasilyreplaceableusingmanufacturerrecommendedparts.
H. (23 81 19.13.H.) Gasheat:
1. General:
a. Heatexchangershallbeaninduceddraftdesign.Positivepressureheatexchangerdesignsshallnotbe allowed.
b. Shallincorporateadirect-sparkignitionsystemandredundantmaingasvalve.
c. Gassupplypressureattheinlettotherooftopunitgasvalvemustmatchthatrequiredbythemanufacturer.
2. Theheatexchangershallbecontrolledbyanintegratedgascontroller(IGC)microprocessor.
a. IGCboardshallnotifyusersoffaultusinganLED(light-emittingdiode).
b. IGCboardshallcontainalgorithmsthatmodifyevaporator-fanoperationtopreventfuturecyclingonhigh temperaturelimitswitch.
c. Unitshallbeequippedwithanti-cycleprotectionwithoneshortcycleonunitflameroll-outswitchor4 continuousshortcyclesonthehightemperaturelimitswitch.FaultindicationshallbemadeusinganLED.
3. Standardheatexchangerconstruction:
a. Heatexchangershallbeofthetubular-sectiontypeconstructedofaminimumof20-gaugesteelcoated withanominal1.2-milaluminum-siliconealloytoaidwithcorrosionresistance.
b. Burnersshallbeoftheinshottypeconstructedofaluminum-coatedsteel.
c. Burnersshallincorporateorificesforratedheatoutputupto2000ft(610m)elevation.Additional accessorykitsmayberequiredforapplicationsabove2000ft(610m)elevation,dependingonlocalgas supplyconditions.
d. Eachheatexchangertubeshallcontainmultipledimplesforincreasedheatingeffectiveness.
4. Optionalstainlesssteelheatexchangerconstruction:
a. Useenergysaving,direct-sparkignitionsystem.
b. Usearedundantmaingasvalve.
c. Burnersshallbeoftheinshottypeconstructedofaluminum-coatedsteel.
d. Allgaspipingshallentertheunitcabinetatasinglelocationonsideofunit(verticalplane).
e. Theoptionalstainlesssteelheatexchangershallbeofthetubular-sectiontype,constructedofaminimum of20-gaugetype409stainlesssteel.
f. Type409stainlesssteelshallbeusedinheatexchangertubesandvestibuleplate.
g. Completestainlesssteelheatexchangerallowsforgreaterapplicationflexibility.
5. Induceddraftcombustionmotorandblower:
a. Shallbeadirect-drive,singleinlet,forward-curvedcentrifugaltype.
b. Shallbemadefromsteelwithacorrosion-resistantfinish.
c. Shallhavepermanentlylubricatedsealed
bearings.
d. Shallhaveinherentthermaloverload
protection.
e. Shallhaveanautomaticresetfeature.
I. (23 81 19.13.I.)Coils:
1. Standardaluminumfin/coppertubecoils:
a. Standardevaporatorandcondensercoilsshallhavealuminumlancedplatefinsmechanicallybondedto seamlessinternallygroovedcoppertubeswithalljointsbrazed.
b. Evaporatorcoilsshallbeleaktestedto150psig,pressuretestedto450psig,andqualifiedtoUL1995burst testat1775psig.
c. Condensercoilsshallbeleaktestedto150psig,pressuretestedto650psig,andqualifiedtoUL1995burst testat1980psig.
2. Optionalpre-coatedaluminum-fincondensercoils:
a. Shallhaveadurableepoxy-phenoliccoatingtoprovideprotectioninmildlycorrosivecoastalenvironments.
b. Coating shall be applied to the aluminum fin stock prior to the fin stamping process to create an inert barrier between the aluminum fin and copper tube.
c. Epoxy-phenolicbarriershallminimizegalvanicactionbetweendissimilarmetals.
d. Corrosiondurabilityoffinstockshallbeconfirmedthroughtestingtobenolessthan1000hourssaltspray perASTMB117-90.
e. Corrosiondurabilityoffinstockshallbeconfirmedthroughtestingtohavenovisiblecorrosionafter a 48-hourimmersioninaroomtemperaturesolutionof5%salt,1%aceticacid.
f. Finstockcoatingshallpass2000hoursofthefollowing:oneweekexposureintheprohesionchamber followedbyoneweekofacceleratedultravioletlighttesting.Prohesionchamber:thesolutionshallcontain 3.5%sodiumchlorideand0.35%ammoniumsulfate.Theexposurecycleisonehourofsaltfogapplication atambientfollowedbyonehourdryingat95°F(35°C).
3. Optionalcopper-finevaporatorandcondensercoils:
a. Shallbeconstructedofcopperfinsmechanicallybondedtocoppertubesandcoppertubesheets.
b. Galvanizedsteeltubesheetsshallnotbeacceptable.
c. Apolymerstripshallpreventcoilassemblyfromcontactingthesheetmetalcoilpantominimizepotential forgalvaniccorrosionbetweencoilandpan.
4. OptionalE-coatedaluminum-fin,evaporator and condensercoils:
a. Shallhave a flexible epoxy polymer coating uniformly applied to all coil surface areas without material bridging between fins.
b. Coating process shall ensure complete coil encapsulation of tubes, fins, and headers.
c. Color shall be high gloss black with gloss per ASTM D523-89.
d. Uniform dry film thickness from 0.8 to 1.2 mil on all surface areas including fin edges.
e. Superior harness characteristics of 2H per ASTM D3363-92A and cross-hatch adhesion of 4B-5B per ASTM D3359-93.
f. Impact resistance shall be up to 160 in.-lb (ASTM D2794-93).
g. Humidity and water immersion shall be up to minimum 1000 and 250 hours respectively (ASTM D2247-92 and ASTM D870-92).
h. Corrosion durability shall be confirmed through testing to be no less than 6000 hours salt spray per ASTM B117-90.
5. Standard ALL Aluminum Novation® Coils:
a. Standard condenser coils shall have all aluminum Novation Heat Exchanger Technology design consisting of aluminum multi-port flat tube design and aluminum fin. Coils shall be a furnace brazed design and contain epoxy lined shrink wrap on all aluminum to copper connections.
b. Condenser coils shall be leak tested to 150 psig, pressure tested to 650 psig, and qualified to UL 1995 burst test at 1980 psig.
6. OptionalE-coatedaluminum-fin,aluminumtubecondensercoils:
a. Shallhaveaflexibleepoxypolymercoatinguniformlyappliedtoallcoilexternalsurfaceareaswithout materialbridgingbetweenfins.
b. Coatingprocessshallensurecompletecoilencapsulation of tubes, fins, and headers.
c. E-coatthicknessof0.8to1.2-milwithtopcoathavingauniformdryfilmthicknessfrom1.0to2.0milon allexternalcoilsurfaceareas,includingfinedges,shallbeprovided.
d. Shallhavesuperiorhardnesscharacteristicsof2HperASTMD3363-00andcrosshatchadhesionof 4B-5BperASTMD3359-02.
e. Shallhavesuperiorimpactresistancewithnocracking,chippingorpeelingperNSF/ANSI51-2002Method 10.2.
J. (23 81 19.13.J.)Refrigerantcomponents:
1. Refrigerantcircuitshallincludethefollowingcontrol,safety,andmaintenancefeatures:
a. Fixed orifice metering system (on non-Humidi-MiZer® units) provides correct distribution of two-phase refrigerant by including multiple fixed orifice devices in each refrigeration circuit. Each orifice is to be optimized to the coil circuit it serves.
b. ThermostaticExpansionValve(TXV)shallhelpprovideoptimumperformanceacrosstheentireoperatingrange. Shallcontainremovablepowerelementtoallowchangeoutofpowerelementandbulbwithoutremovingthevalvebody.
c. Refrigerantfilterdrier-Solidcoredesign.
d. Servicegaugeconnectionsonsuctionanddischargelines.
e. Pressuregaugeaccessthroughaspeciallydesignedaccessscreenonthesideoftheunit.
2. Compressors:
a. Unitshallusefullyhermetic,scrollcompressorforeachindependentrefrigerationcircuit.
b. Modelsshallbeavailablewith2compressor/2-stagecooling.
c. Compressormotorsshallbecooledbyrefrigerantgaspassingthroughmotorwindings.
d. Compressorsshallbeinternallyprotectedfromhighdischargetemperatureconditions.
e. Compressorsshallbeprotectedfromanover-temperatureandover-amperageconditionsbyaninternal, motoroverloaddevice.
f. Compressorshallbefactorymountedonrubbergrommets.
g. Compressormotorsshallhaveinternallinebreakthermal,currentoverloadandhighpressuredifferentialprotection.
h. Crankcaseheatersshallnotberequiredfornormaloperatingrange,unlessprovidedbythefactory.
K. (23 81 19.13.K.)Filtersection:
1. Filtersaccessisspecifiedintheunitcabinetsectionofthisspecification.
2. Filters shallbeheldinplacebyapreformed,slide-outfiltertray,facilitatingeasyremovalandinstallation.
3. Shallconsistoffactory-installed,lowvelocity,throw-away2-in.thickfiberglassfilters.
4. Filtersshallbestandard,commerciallyavailablesizes.
5. Onlyonesizefilterperunitisallowed.
6. 4-in.filtercapabilityispossiblewithafield-installedpre-engineeredslideoutfiltertrackaccessory.4-in.filtersarefieldfurnished.
L. (23 81 19.13.L.)Evaporatorfanandmotor:
1. Evaporatorfanmotor:
a. Shallhaveinherentautomatic-resetthermaloverloadprotectionorcircuitbreaker.
b. Shallhaveamaximumcontinuousbhpratingforcontinuousdutyoperation;nosafetyfactorsabovethat ratingshallberequired.
2. Belt-drivenevaporatorfan:
a. Beltdriveshallincludeanadjustable-pitchmotorpulleyandbeltbreakprotectionsystem.
b. Shalluserigidpillowblockbearingsystemwithlubricantfittingsataccessiblebearingorlubricationline.
c. Blowerfanshallbedouble-inlettypewithforward-curvedblades.
d. Shallbeconstructedfromsteelwithafinishthataidswithcorrosionresistanceandthatisdynamicallybalanced.
M. (23 81 19.13.M.)Condenserfans and motors:
1. Condenser fan motors:
a. Shallbeatotallyenclosedmotor.
b. Shallusepermanentlylubricatedbearings.
c. Shallhaveinherentthermaloverloadprotectionwithanautomaticresetfeature.
d. Shalluseashaft-downdesign.
2. Condenserfans:
a. Shallbeadirect-drivenpropellertypefan.
b. Shallhavealuminumbladesrivetedtosteelspidersthathavecorrosionresistantpropertiesandshallbe dynamicallybalanced.
N. (23 81 19.13.N.)Specialfeaturesoptionsandaccessories:
1. Staged Air Volume System (SAV™) for 2-stage cooling models only:
a. Evaporatorfanmotor:
1) Shallhavepermanentlylubricatedbearings.
2) Shallhaveamaximumcontinuousbhpratingforcontinuousdutyoperation;nosafetyfactorsabove thatrating.
3) ShallbeVariableFrequencydutyand2-speedcontrol.
4) Shall contain motor shaft grounding ring to prevent electrical bearing fluting damage by safely diverting harmful shaft voltages and bearing currents to ground.
2. Variablefrequencydrive(VFD).Onlyavailableon2-speedindoorfanmotoroption(SAV):
a. Factory-suppliedVFDsqualify,throughABB,fora12-monthwarrantyfromdateofcommissioningor18monthsfromdateofsale,whicheveroccursfirst.
b. Shallbeinstalledinsidetheunitcabinet,mounted,wiredandtested.
c. ShallcontainElectromagneticInterference(EMI)frequencyprotection.
d. Insulatedgatebi-polartransistors(IGBT)usedtoproducetheoutputpulsewidthmodulated(PWM)waveform,allowingforquietmotoroperation.
e. SelfdiagnosticswithfaultandpowercodeLEDindicator.FieldaccessoryDisplayKitavailableforfurther diagnosticsandspecialsetupapplications.
f. RS485capabilitystandard.
g. Electronicthermaloverloadprotection.
h. 5%swingingchokesforharmonicreductionandimprovedpowerfactor.
i. Allprintedcircuitboardsshallbeconformalcoated.
3. IntegratedEconoMi$er®IV,EconoMi$er2,andEconoMi$erXstandardleakratemodels.(Factoryorfield-installed):
a. Integrated,geardrivenopposingmodulatingbladedesigntypecapableofsimultaneouseconomizerand compressoroperation.
b. Independentmodulesforverticalreturnconfigurationshallbeavailable.
c. Damperbladesshallbegalvanizedsteelwithcompositegears.Plasticorcompositebladesonintakeorreturnshallnotbeacceptable.
d. Shallincludeallhardwareandcontrolstoprovidefreecoolingwithoutdoorairwhentemperatureand/or humidityarebelowsetpoints.
e. Shallbeequippedwithgeardrivendampersforboththeoutdoorventilationairandthereturnairforpositiveairstreamcontrol.
f. Standardleakratemodelsshallbeequippedwithdampersnottoexceed2%leakageat1in.wgpressure differential.
g. EconomizercontrolleronEconoMi$erIVmodelsshallbeHoneywellW7212thatprovides:
1) CombinedminimumandDCVmaximumdamperpositionpotentiometerswithcompressorstagingrelay.
2) Functionswithsolidstateanalogenthalpyordrybulbchangeovercontrolsensing.
3) ContainLEDindicatesfor:whenfreecoolingisavailable,whenmoduleisinDCVmode,whenexhaustfancontactisclosed.
h. EconomizercontrolleronEconoMi$erXmodelsshallbetheHoneywellW7220thatprovides:
1) 2-line LCD interface screen for setup, configuration, and troubleshooting.
2) On-board Fault Detection and Diagnostics (FDD) that senses and alerts when the economizer is not operating properly, per California Title 24.
3) Sensor failure loss of communication identification.
4) Automatic sensor detection.
5) Capabilities for use with multi-speed indoor fan systems.
6) Utilize digital sensors: dry-bulb and enthalpy.
i. EconomizercontrolleronEconoMi$er2modelswithPremierLink™ controllershallbe4-20mAdesignandcontrolledbythePremierLinkcontroller.PremierLinkdoesnotcomplywithCaliforniaTitle24FaultDetectionandDiagnostic(FDD)requirements.
j. EconomizercontrolleronEconoMi$er2modelswithRTUOpenmodelsshallbe4-20mAdesigncontrolled directlybytheRTUOpencontroller.RTUOpenmeetsCaliforniaTitle24FaultDetectionandDiagnostic(FDD)requirements.
k. Shallbecapableofintroducingupto100%outdoorair.
l. Shallbeequippedwithabarometricreliefdampercapableofrelievingupto100%returnairandcontain sealsthatmeetASHRAE90.1-2016 and IECC-2015requirements.
m. Shallbedesignedtoclosedamper(s)duringloss-of-powersituationswithspringreturnbuiltintomotor.
n. Drybulboutdoorairtemperaturesensorshallbeprovidedasstandard.Enthalpysensorisalsoavailablefor factory-installedeconomizersonly.Outdoorairsensorsetpointshallbeadjustableandshallrangefrom40 to100°F(4to38°C.)Additionalsensoroptionsshallbeavailableasaccessories.
o. Theeconomizercontrollershallalsoprovidecontrolofanaccessorypowerexhaustunitfunction.Factory setat100%,witharangeof0%to100%.
p. Theeconomizershallmaintainminimumairflowintothebuildingduringoccupiedperiodandprovide designventilationrateforfulloccupancy.
q. Dampersshallbecompletelyclosedwhentheunitisintheunoccupiedmode.
r. Economizercontrollershallaccepta2-10VdcCO2sensorinputforIAQ/DCVcontrol.Inthismode, dampersshallmodulatetheoutdoorairdampertoprovideventilationbasedonthesensorinput.
s. CompressorlockouttemperatureonW7220isadjustablefrom–45°Fto80°F (43°C to 27°C),setatafactorydefaultof32°F (0°C).Othersshallopenat35°F(2°C)andclosesat50°F(10°C).
t. Actuatorshallbedirectcoupledtoeconomizergear.Nolinkagearmsorcontrolrodsshallbeacceptable.
u. Economizercontrollershallprovideindicationswheninfreecoolingmode,intheDCVmode,orthe exhaustfancontactisclosed.
4. IntegratedEconoMi$er®2,andEconoMi$erXUltraLowLeakratemodels.(Factoryorfield-installed):
a. Integrated,geardrivenopposingmodulatingbladedesigntypecapableofsimultaneouseconomizerand compressoroperation.
b. Independentmodulesforverticalreturnconfigurationshallbeavailable.
c. Damper blades shall be galvanized steel with composite gears. Plastic or composite blades on intake or return shall not be acceptable.
d. Shallincludeallhardwareandcontrolstoprovidefreecoolingwithoutdoorairwhentemperatureand/or humidityarebelowsetpoints.
e. Shallbeequippedwithgeardrivendampersforboththeoutdoorventilationairandthereturnairforpositiveairstreamcontrol.
f. UltraLowLeakdesignmeetsCaliforniaTitle24section140.4andASHRAE90.1-2016 and IECC-2015requirements of4 cfmpersqftontheoutsideairdampersand10cfmpersqftonthereturndampers.
g. EconomizercontrolleronEconoMi$erXmodelsshallbetheHoneywellW7220thatprovides:
1) 2-lineLCDinterfacescreenforsetup,configurationandtroubleshooting.
2) On-boardFaultDetectionandDiagnostics(FDD)thatsensesandalertswhentheeconomizerisnot operatingproperly,perCalifornia Title 24 Fault Detection and Diagnostic (FDD) requirements.
3) Sensorfailurelossofcommunicationidentification.
4) Automaticsensordetection.
5) Capabilitiesforusewithmultiple-speedindoorfansystems.
6) Utilizedigitalsensors:DrybulbandEnthalpy.
h. EconomizercontrolleronEconoMi$er2modelswithRTUOpenmodelsshallbe4-20mAdesigncontrolled directlybytheRTUOpencontroller.RTUOpenmeetsCaliforniaTitle24FaultDetectionandDiagnostic(FDD)requirements.
i. Shallbecapableofintroducingupto100%outdoorair.
j. Shallbeequippedwithabarometricreliefdampercapableofrelievingupto100%returnairandcontain sealsthatmeetASHRAE90.1-2016 and IECC-2015requirements.
k. Shallbedesignedtoclosedamper(s)duringloss-of-powersituationswithspringreturnbuiltintomotor.
l. Drybulboutdoorairtemperaturesensorshallbeprovidedasstandard.Enthalpysensorisalsoavailablefor factory-installedeconomizersonly.Outdoorairsensorsetpointshallbeadjustableandshallrangefrom40 to100°F(4to38°C).Additionalsensoroptionsshallbeavailableasaccessories.
m. Theeconomizercontrollershallalsoprovidecontrolofanaccessorypowerexhaustunitfunction.Factory setat100%,witharangeof0%to100%.
n. The economizer shall maintain minimum airflow into the building during occupied period and provide design ventilation rate for full occupancy.
o. Dampersshallbecompletelyclosedwhentheunitisintheunoccupiedmode.
p. Economizercontrollershallaccepta2-10VdcCO2sensorinputforIAQ/DCVcontrol.Inthismode, dampersshallmodulatetheoutdoorairdampertoprovideventilationbasedonthesensorinput.
q. CompressorlockouttemperatureonW7220isadjustablefrom–45°Fto80°F (43°C to 27°C),setatafactorydefaultof32°F (0°C).Othersshallopenat35°F(2°C)andclosesat50°F(10°C).
r. Actuatorshallbedirectcoupledtoeconomizergear.Nolinkagearmsorcontrolrodsshallbeacceptable.
s. Economizer controller shall provide indications when in free cooling mode, in the DCV mode, or the exhaust fan contact is closed.
5. Two-PositionMotorizedDamper:
a. Dampershallbea2-positiondamper.Dampertravelshallbefromthefullclosedpositiontothefieldadjustable%-opensetpoint.
b. Dampershallincludeadjustabledampertravelfrom25%to100%(fullopen).
c. Dampershallincludesingleordualblade,geardrivendampersandactuatormotor.
d. Actuatorshallbedirectcoupledtodampergear.Nolinkagearmsorcontrolrodsshallbeacceptable.
e. Damperwilladmitupto100%outdoorairforapplicablerooftopunits.
f. Dampershallcloseuponindoor(evaporator)fanshutoffand/orlossofpower.
g. Thedamperactuatorshallplugintotherooftopunit’swiringharnessplug.Nohardwiringshallberequired.
h. Outsideairhoodshallincludealuminumwaterentrainmentfilter.
i. Not for use with Staged Air Volume (SAV™) models.
6. Manualdamper
a. Manualdamperpackageshallconsistofdamper,airinletscreen,andrainhoodwhichcanbepresettoadmitupto25%outdoorairforyearroundventilation.
b. Not for use with Staged Air Volume (SAV) models.
7. Humidi-MiZer®adaptivedehumidificationsystem (not available on 30 size models):
a. The Humidi-MiZer Adaptive Dehumidification System shall be factory-installed in 48TC17-28 models with RTPF (round tube plate-fin) condenser coils, and shall provide greater dehumidification of the occupied space by two modes of dehumidification operations besides its normal design cooling mode:
1) Subcoolingmodefurthersubcoolsthehotliquidrefrigerantleavingthecondensercoilwhenboth temperatureandhumidityinthespacearenotsatisfied.
2) Hotgasreheatmodeshallmixaportionofthehotgasfromthedischargeofthecompressorwiththehotliquidrefrigerantleavingthecondensercoiltocreateatwo-phaseheattransferinthesystem, resultinginaneutralleavingairtemperaturewhenonlyhumidityinthespaceisnotsatisfied.
3) Includesheadpressurecontroller.
8. Headpressurecontrolpackage(Motormaster®):
a. Controllershallcontrolcoilheadpressurebycondenser-fanspeedmodulationorcondenser-fancycling andwindbaffles.
b. Shallconsistofsolid-statecontrolandcondenser-coiltemperaturesensortomaintaincondensingtemperaturebetween90°F(32°C)and110°F(43°C)atoutdoorambienttemperaturesdownto–20°F(–29°C).
9. Propaneconversionkit:
a. Packageshallcontainallthenecessaryhardwareandinstructionstoconvertastandardnaturalgasunitfor usewithliquefiedpropane.Kitsshallbeavailableforelevationsfrom0upto14,000ft(4,267m).
10. Condensercoilhailguardassembly:
a. Shallprotectagainstdamagefromhail.
b. Shallbelouveredstyledesign.
11. Unit-mounted,non-fuseddisconnectswitch:
a. Switchshallbefactory-installed,internallymounted.
b. NationalElectricCode(NEC)andULapprovednon-fusedswitchshallprovideunitpowershutoff.
c. Shallbeaccessiblefromoutsidetheunit.
d. Shallprovidelocalshutdownandlockoutcapability.
e. Sizedonlyfortheunitasorderedfromthefactory.Doesnotaccommodatefield- installeddevices.
12. Convenienceoutlet:
a. Poweredconvenienceoutlet:
1) Outletshallbepoweredfrommainlinepowertotherooftopunit.
2) Outletshallbepoweredfromlinesideofdisconnectbyinstallingcontractor,asrequiredbycode.Ifoutletispoweredfromloadsideofdisconnect,unitelectricalratingsshallbeETLcertifiedandrated foradditionaloutletamperage.
3) Outletshallbefactory-installedandinternallymountedwitheasilyaccessible115-vfemalereceptacle.
4) Outletshallinclude15ampGFIreceptacleswithindependentfuseprotection.
5) Voltagerequiredtooperateconvenienceoutletshallbeprovidedbyafactory-installedstep-down transformer.
6) Outletshallbeaccessiblefromoutsidetheunit.
7) Outletshallincludeafield-installed“WetinUse”cover.
b. Factory-Installed Non-poweredconvenienceoutlet.
1) Outlet shall be powered from a separate 115-120v power source.
2) A transformer shall not be included.
3) Outlet shall be factory-installed and internally mounted with easily accessible 115-v female receptacle.
4) Outlet shall include 15 amp GFI receptacles.
5) Outlet shall be accessible from outside the unit.
6) Outlet shall include a field-installed “Wet in Use” cover.
c. Field-Installed Non-poweredconvenienceoutlet.
1) Outlet shall be powered from a separate 115-120v power source.
2) A transformer shall not be included.
3) Outlet shall be factory-installed and internally mounted with easily accessible 115-v female receptacle.
4) Outlet shall include 20 amp GFI receptacles. This kit provides a flexible installation method which allows code compliance for height requirements of the GFCI outlet from the finished roof surface as well as the capability to relocate the outlet to a more convenient location.
5) Outlet shall be accessible from outside the unit.
6) Outlet shall include a field-installed “Wet in Use” cover.
13. Fluedischargedeflector:
a. Fluedischargedeflectorshalldirectunitexhaustverticallyinsteadofhorizontally.
b. Deflectorshallbedefinedasa“naturaldraft”devicebytheNationalFuelandGas(NFG)code.
14. Centrifugalpropellerpowerexhaust:
a. Powerexhaustshallbeusedinconjunctionwithanintegratedeconomizer.
b. Independentmodulesforverticalreturnconfigurationsshallbeavailable.
c. Powerexhaustshallbecontrolledbyeconomizercontrolleroperation.Exhaustfansshallbeenergizedwhendampersopenpastthe0-100%adjustablesetpointontheeconomizercontrol.
15. Roof curbs (vertical):
a. Full perimeter roof curb with exhaust capability providing separate air streams for energy recovery from the exhaust air without supply air contamination.
b. Formed galvanized steel with wood nailer strip and shall be capable of supporting entire unit weight.
c. Permits installation and securing of ductwork to curb prior to mounting unit on the curb.
16. Adapter curb (vertical):
a. Full perimeter, fully assembled, and welded roof curb with exhaust capability providing separate air streams for energy recovery from the exhaust air without supply air contamination.
b. Formed galvanized steel with wood nailer strip and shall be capable of supporting entire unit weight.
c. Permits installation of new 48TC17-28 models to past Carrier design curb models: DP, DR, HJ, TM, and TJ. (Not for 48TJE024-28 models.) Check with Carrier sales expert for further details andinformation.
17. Highaltitudegasconversionkit:
a. Packageshallcontainallthenecessaryhardwareandinstructionstoconvertastandardnaturalgasunitto operatefrom3,000 to 10,000ft(914to3048m)elevationand10,001 to 14,000ft(3049 to 4267m)elevation.
18. Outdoorairenthalpysensor:
a. Theoutdoorairenthalpysensorshallbeusedtoprovidesingleenthalpycontrol.Whenusedinconjunction withareturnairenthalpysensor,theunitwillprovidedifferentialenthalpycontrol.Thesensorallowstheunittodetermineifoutsideairissuitableforfreecooling.
19. Returnairenthalpysensor:
a. Thereturnairenthalpysensorshallbeusedinconjunctionwithanoutdoorairenthalpysensortoprovide differentialenthalpycontrol.
20. Indoorairquality(CO2)sensor:
a. Shallbeabletoprovidedemandventilationindoorairquality(IAQ)control.
b. TheIAQsensorshallbeavailableinductmount,wallmount,orwallmountwithLEDdisplay.Thesetpointshallhaveadjustmentcapability.
21. Smokedetectors:
a. Shallbeafour-wirecontrolleranddetector.
b. Shallbeenvironmentalcompensatedwithdifferentialsensingforreliable,stable,anddrift-freesensitivity.
c. Shallusemagnet-activatedtest/resetsensorswitches.
d. Shallhavetool-lessconnectionterminalaccess.
e. Shallhavearecessedmomentaryswitchfortestingandresettingthedetector.
f. Controllershallinclude:
1) Onesetofnormallyopenalarminitiationcontactsforconnectiontoaninitiatingdevicecircuitona firealarmcontrolpanel.
2) TwoForm-Cauxiliaryalarmrelaysforinterfacewithrooftopunitorotherequipment.
3) OneForm-Csupervision(trouble)relaytocontroltheoperationoftheTroubleLEDonaremotetest/resetstation.
4) Capableofdirectconnectiontotwoindividualdetectormodules.
5) Canbewiredtoupto14otherductsmokedetectorsformultiplefanshutdownapplications.
22. Horn/strobeannunciator:
a. Providesanaudible/visualsignalingdeviceforusewithfactory-installedoptionorfield-installedaccessory smokedetectors.
1) Requiresinstallationofafield-supplied24-vtransformersuitablefor4.2VA(AC)or3.0VA(DC)perhorn/strobeaccessory.
2) Requiresfield-suppliedelectricalbox,NorthAmerican1-gangbox,2-in.(51mm)x4-in.(102mm).
3) Shallhaveaclearcoloredlens.
23. Winterstartkit:
a. Shallcontainabypassdevicearoundthelowpressureswitch.
b. Shallberequiredwhenmechanicalcoolingisrequireddownto25°F(–4°C).
c. Shallnotberequiredtooperateonaneconomizerwhenbelowanoutdoorambientof40°F(4°C).
24. Timeguard:
a. Shallpreventcompressorshortcyclingbyprovidinga5-minutedelay(±2minutes)beforerestartinga compressoraftershutdownforanyreason.
b. Onedeviceshallberequiredpercompressor.
25. Displaykitforvariablefrequencydrive (VFD):
a. KitallowstheabilitytoaccesstheVFDcontrollerprogramstoprovidespecialsetupcapabilitiesand diagnostics.
b. Kitcontainsdisplaymoduleandcommunicationcable.
c. DisplaykitcanbepermanentlyinstalledintheunitorusedonanySAV™systemVFDcontrollerasneeded.
26. Condensate Overflow Switch:
a. This sensor and related controller monitors the condensate level in the drain pan and shuts down compression operation when overflow conditions occur. It includes:
1) Indicatorlight—solidred(morethan10secondsonwatercontact-compressorsdisabled),blinking red(sensordisconnected).
2) 10seconddelaytobreak—eliminatesnuisancetripsfromsplashingorwavesinpan(sensorneeds10 secondsofconstantwatercontactbeforetripping).
3) Disablesthecompressor(s)operationwhencondensateplugisdetected,butstillallowsfanstorunfor Economizer.
27. Hingedaccesspanels:
a. Shall provide easy access through hinged access doors with vinyl coated door retainers.
b. Shall be on major panels of – filter, control box, and fan motor.
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