Takagi T?H2?DV User manual


T‐H2‐DV/T‐H2‐OS
On‐DemandCondensingWaterHeater
InstallationManualandOwner’sGuide

FEATURING
•ENDLESSHOTWATER
•ONDEMANDUSAGE
•COMPACT,SPACESAVING
•ENERGYCONSERVATION
•COMPUTERIZEDSAFETY
•NOPILOTLIGHT
•EASYLINKSYSTEM
WARNING
WARNING
GasTanklessWaterHeater
ModelT‐H2‐DVandT‐H2‐OS
Suitableforpotablewaterheatingandspaceheating 
TAKAGIIndustrialCo.USA,Inc.
5Whatney
Irvine,CA92618
TollFree:(888)882‐5244USA
TollFree:(877)877‐4953CANADA



Thisproductmustbeinstalledand
servicedbyalicensedplumber,a
licensedgasfitter,oraprofessional
servicetechnician.Improper
installationand/oroperation,or
installationbyanunqualified
person,willvoidthewarranty.
Iftheinformationinthismanualis
notfollowedexactly,afireor
explosionmayresult,causing
propertydamage,personalinjury,or
death.

Contents
2│Page
CONTENTS
SPECIFICATIONS
T‐H2‐DVandT‐H2‐OS
NaturalGasInput
(OperatingRange)
Min:13,000Btu/h
Max:199,000Btu/h
LPGInput
(OperatingRange)
Min:13,000Btu/h
Max:199,000Btu/h
GasConnection¾”NPT
WaterConnections¾”NPT
CondensateDrainPort
Connection½”NPT
WaterPressure 15‐150psi*
NaturalGasPressure
Inlet
Min.5.0”WC
Max.10.5”WC
LPGas
PressureInlet
Min.8.0”WC
Max.14.0”WC
ManifoldPressureof
theT‐H2‐DVNatural:3.2”WC
Propane:5.5”WC
ManifoldPressureof
theT‐H2‐OS
Natural:2.7”WC
Propane:4.6”WC
Weight 73lbs.(T‐H2‐DV)
70lbs.(T‐H2‐OS)
Dimensions H25.6”xW18.5”xD12.4”
Ignition ElectricIgnition
Electric
Supply 120VAC(60Hz)
Consumption
Operationof
theT‐H2‐DV
152W
(1.27A)
Operationof
theT‐H2‐OS
102W
(0.85A)
Standby8.2W
(0.07A)
Freeze‐
Protection
207W
(1.73A)

SPECIFICATIONS………………………………...
INTRODUCTION……………………………….…
SAFETYGUIDELINES…………….……………..
INSTALLATION………………………………..….
General………………………………………..…
IncludedAccessories…………………..…
Optionalitems…………………………..…..
WarningforInstallations………..….....
High‐altituderegionsupportfunctions…
T‐H2‐OSInstallation…………………….…
T‐H2‐DVInstallation………..…………..…
VentingInstructions……………………....
GasSupply/GasPipeSizing………...…
WaterConnections……………..……….…
PressureReliefValve………………………
Condensatedrain…………………………..
ElectricalConnections…………….........
RemoteControllerConnection…….…
PumpControlConnection………..…….
PumpControlMode…………………….…
Easy‐LinkSystem…………………………....
APPLICATIONS...…………………………………
SpaceHeating……….………….……………
INITIALOPERATION..…………………….……


OPERATINGSAFETY……………………………
NORMALOPERATION…………………………
General………..……….………….……………
Temperaturesettings.…….…..…………
Flow……………………………………………….
FreezeProtectionSystem…….…………
MaintenanceandService………………
UnitDrainingandFilterCleaning……
TROUBLESHOOTING……..……………………
General………..……….………….……………
Errorcodes.…………………….…..…………
COMPONENTSDIAGRAM………………..…
PARTSLIST………………….………………………
OUTPUTTEMPERATURECHART……...…
WARRANTY………………….…………………….
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
Takagi reservestherighttodiscontinue,orchange
atanytime,specificationsordesignswithout
noticeandwithoutincurringobligations.
*40psioraboveisrecommendedformaximumflow
NOTE
*Checktheratingplatetoensurethisproduct
matchesyourspecifications.
*InaccordancewithANZIZ21.10.3andSCAQMD
Rule1146.2,COemissiondoesnotexceed400
PPMfornormalinput
InstallationManual
Owne
r
’sGuide

Introduction
3│Page
INTRODUCTION
*Thisdiagram
illustratesTakagi’s
tanklesswaterheater
designconceptsonly
anddoesnot
accuratelyrepresent
totheT‐H2‐DV/T‐H2‐
OS’sphysical
description.
•Thismanualprovidesinformationnecessaryfortheinstallation,operation,and
maintenanceoftheT‐H2‐DV/T‐H2‐OSwaterheater.
•Themodeldescriptionislistedontheratingplatewhichisattachedtothesidepanelof
thewaterheater.
•Pleasereadallinstallationinstructionscompletelybeforeinstallingthisproduct.
•Ifyouhaveanyproblemsorquestionsregardingthisequipment,consultwithTakagior
itslocalrepresentative.
•TheT‐H2‐DV/T‐H2‐OSWaterHeaterisanon‐demand,tanklesswaterheaterdesigned
toefficientlysupplyendlesshotwaterforyourneeds.
•TheprinciplebehindtheT‐H2‐DV/T‐H2‐OSWaterHeaterissimple:














1. Ahotwatertapisturnedon.
2. Waterenterstheheater.
3. Thewaterflowsensordetectsthewaterflow.
4. Thecomputerautomaticallyignitestheburner.
5. Watercirculatesthroughtheheatexchangerandthengetshot.
6. Thecomputerwillmodulatethegassupplyvalveandwaterflowtoproducetheright
amountofhotwateratthecorrecttemperature.
7.
When

the

tap

is

turned

off,

the

unit

shuts

down.
•TheT‐H2‐DV/T‐H2‐OSarehighefficiencymodelswithanin‐buildsecondaryheat
exchangerthatabsorbslatentheatfromtheexhaustgas.
Burner
Condensate
drainport
Secondaryheatexchanger
Thermistor
Thermistor
GasValve
Flowsensor
Watercontrolvalve
B
yp
assvalve
Intake
p
ortExhaust
Fanmotor
Primaryheat
exchanger
Thermistor
PCB
HotWaterOutlet ColdWaterOutlet
Gas

SafetyGuidelines
4│Page

•
•Watertemperaturesover125°Fcancausesevereburnsinstantlyordeathfromscalding.The
watertemperatureissetat120°F(49°C)fromthefactorytominimizeanyscaldingrisk.Before
bathingorshoweringalwayscheckthewatertemperature.
•Donotstoreorusegasolineorotherflammables,vapors,orliquidsinthevicinity
ofthisappliance.
•Donotreversethewaterand/orgasconnectionsasthiswilldamagethegas
valvesandcancausesevereinjuryordeath.Followthediagramonp.19when
installingyourwaterheater:
•Donotusethisapplianceifanyparthasbeenincontactwithorbeenimmersedin
water.Immediatelycallalicensedplumber,alicensedgasfitter,oraprofessional
servicetechniciantoinspectand/orservicetheunitifnecessary.
•Donotdisconnecttheelectricalsupplyiftheambienttemperaturewilldrop
belowfreezing.TheFreezePreventionSystemonlyworksiftheunithaselectrical
power.Thewarrantywillnotbecoverediftheheatexchangerisdamageddueto
freezing.RefertothesectionontheFreezePreventionSystemonp.39formore
information.
SAFETYGUIDELINES

GENERAL

1. Followalllocalcodes,orintheabsenceoflocalcodes,followthemostrecenteditionofthe
NationalFuelGasCode:ANSIZ223.1/NFPA54intheUSAorCAN/CSAB149.1NaturalGas,Propane
InstallationCodeinCanada.
2. Properlygroundtheunitinaccordancewithalllocalcodesorintheabsenceoflocalcodes,with
theNationalElectricalCodes:ANSI/NFPA70intheUSAorCSAstandardC22.1CanadaElectrical
CodePart1inCanada.
3. CarefullyplanwhereyouintendtoinstallyourT‐H2‐DV/T‐H2‐OSWaterHeater.Pleaseensure:
•Yourwaterheaterwillhaveenoughcombustibleairandproper
ventilation.
•Locateyourheaterwherewaterleakagewillnotdamage
surroundingareas(pleaserefertop.5).
4. ChecktheratingplateforthecorrectGASTYPE,GASPRESSURE,WATER
PRESSUREandELECTRICRATING.
*Ifthisunitdoesnotmatchyourrequirements,donotinstalland
consultwithTAKAGI.
5. Ifanyproblemshouldoccur,turnoffallhotwatertapsandturnoffthe
gas.ThencallatrainedtechnicianortheGasCompanyorthe
manufacturer.


Prohibited
WARNING
RATINGPLATE

Installation
5│Page
•Installationandservicemustbeperformedbyaqualifiedinstaller(for
example,alicensedplumberorgasfitter),otherwisethewarrantybyTakagi
willbevoid.
•Theinstaller(licensedprofessional)isresponsibleforthecorrectinstallation
ofyourT‐H2‐DV/T‐H2‐OSWaterHeaterandforcompliancewithallnational,
state
/p
rovincial
,
andlocalcodes.
•Thewarrantywillnotcoverdamagecausedbywaterquality.
•Onlypotablewaterorpotablewater/glycolmixturescanbeusedwiththis
waterheater.Donotintroducepoolorspawater,oranychemically
treatedwaterintothewaterheater.
•Waterhardnesslevelsmustnotexceed7grainspergallon(120ppm)for
singlefamilydomesticapplicationsormorethan4grainspergallon(70
ppm)forallothertypesofapplications.Waterhardnessleadstoscale
formationandmayaffect/damagethewaterheater.Hardwaterscaling
mustbeavoidedorcontrolledbyproperwatertreatment.
•WaterpHlevelsmustbebetween6.5and8.5
•Wellwatermustbetreated.
•AlthoughtheT‐H2‐DV/T‐H2‐OSisdesignedtooperatewithminimalsound,
TAKAGIdoesnotrecommendinstallingtheunitonawalladjacenttoa
bedroom,oraroomthatisintendedforquietstudyormeditation,etc.
•Locateyourheaterclosetoadrainwherewaterleakagewillnotdodamageto
surroundingareas.Aswithanywaterheatingappliance,thepotentialfor
leakageatsometimeinthelifeoftheproductdoesexist.Takagiwillnotbe
responsibleforanywaterdamagethatmayoccur.Ifyouinstalladrainpan
undertheunit,ensurethatitwillnotrestrictthecombustionairflow.
•T‐H2‐DV/T‐H2‐OSarehighefficiencyproductsthatcreatecondensation.A
condensationdraintubemustbeinstalledwiththeT‐H2‐DV/T‐H2‐OSto
dischargecondensateintoadrainoutlet.Formoreinformation,refertop.20.
•TAKAGIdoesnotrecommendinstallingunitinanatticduetosafetyissues.If
youinstallyourT‐H2‐DV/T‐H2‐OSinanattic:
•Makesureyourunitwillhaveenoughcombustionairandproper
ventilation.
•KeeptheareaaroundyourT‐H2‐DV/T‐H2‐OSclean.Whendustcollectson
theflamesensor,thewaterheaterwillshutdownonerrors.
•Locateunitforeasyaccessforserviceandmaintenance.
•Adrainpan,orothermeansofprotectionagainstwaterdamage,is
requiredtobeinstalledunderthewaterheaterincaseofleaks.
INSTALLATION


Allgaswaterheatersrequirecarefulandcorrectinstallationtoensuresafeandefficientoperation.This
manualmustbefollowedexactly.Readthe“SafetyGuidelines”sectionatthebeginningofthismanual.



WARNING
WARNING
CAUTION
PLEASEREADTHISMANUALCAREFULLYANDFOLLOWALLDIRECTIONS.

Installation
6│Page

GENERAL

1. Followalllocalcodes,orintheabsenceoflocalcodes,followthemostrecenteditionofthe
NationalFuelGasCode:ANSIZ223.1/NFPA54intheUSAorCAN/CSAB149.1NaturalGas,
PropaneInstallationCodeinCanada.

2. Themanifoldgaspressureispresetatthefactory.Itiscomputercontrolledandshouldnot
needadjustment.

3. Maintainproperspaceforservicing.Installtheunitsothatitcanbeconnectedorremoved
easily.Refertop.8,p.9andp.10forproperclearances.

4. Theelectricalconnectionrequiresameansofdisconnection,toterminatepowertothewater
heaterforservicingandsafetypurposes.

5. Ifyouwillbeinstallingtheunitinacontaminatedareawithahighlevelofdust,sand,flour,
aerosolsorothercontaminants/chemicals,theycanbecomeairborneandenterandbuildup
withinthefanandburnercausingdamagetotheunit.

6. Particlesfromflour,aerosols,andothercontaminantsmayclogtheairventorreducethe
functionsoftherotatingfanandcauseimproperburningofthegas.Regularlyensurethatthe
areaaroundtheunitisdust‐ ordebris‐free;regularmaintenanceisrecommendedforthese
typesofenvironment.

7. Donotinstalltheunitwheretheexhaustventispointingintoanyopeninginabuildingorwhere
thenoisemaydisturbyourneighbors.Makesuretheventterminationmeetstherequired
distancebylocalcodefromanydoorwayoropeningtopreventexhaustfromenteringabuilding
(refertop.15).
INCLUDEDACCESSORIES

Checkthattheinstallationmanual,thecommunicationcable,thewarrantycardandtheTH‐PA01PVC
adaptorareincludedwiththeunit(theadaptorcomeswiththeT‐H2‐DVmodelonly).
Fordetailsonhowtoconnecttheadaptor,refertoP.13.
1.Manual


2.Communicationcable

3.WarrantyCard

4.TH‐PA01PVCadaptor
(T‐H2‐DVmodelonly)

Q
t
y
:1
Qty:1
Q
t
y
:1
Qty:1

Installation
7│Page

OPTIONALITEMS
1.TM‐RE30TemperatureRemoteController
TheTM‐RE30TemperatureRemoteControllerhastwofunctions.
ItallowstheoutputtemperaturefromtheT‐H2‐DV/T‐H2‐OStobe
adjustedwithintherangeof100°Fto185°F,anditalsoworksas
adiagnostictoolthatwillgiveaconciseerrorcodewhenever
thereisaproblemwiththeunit.Thetemperatureoptionsare
100°F,105°F,110°F,115°F,120°F,125°F,130°F,135°F,140°F,
145°F,150°F,155°F,160°F,165°F,170°F,175°F,180°Fand185°F.
Seethetroubleshootingsectionforinformationonpossibleerror
codes.
2.TH‐PC02Pipecover
TheTH‐PC02PipecoverprotectstheplumbingpipestotheT‐H2‐
DV/T‐H2‐OSfromunexpectedadjustments.Thispipecoveris
fixedtothebottomoftheT‐H2‐DV/T‐H2‐OS,whichhidesthe
plumbingandimprovesthevisualaspectsofthewholeinstallation
forthewaterheater.
3.TK‐KPWL4andTK‐KPWH4T‐VentWallthimblewithTermination

Theseterminationsareusedwhenventingoutthroughthewalland
arecompatiblewiththeT‐Ventpipesystem.
Theseterminationsarespecialstainlesssteelventsforgasappliances
andareULlistedasCategoryII,IIIandIV.Therearetwotypesof
terminations:theLouverterminationandtheHoodtermination.For
differentwallthicknesses,thereare3rangesoflengthsavailable
(refertotheT‐Ventbrochurefordetails).
Installtheseventterminationsinaccordancewiththeirinstallation
instructionsandanyapplicablelocalcodes.
4.TH‐NT01Neutralizerkit

TheTH‐NT01Neutralizerassemblyneutralizesthecondensate
(acidicwater)thatformsinthesecondaryheatexchangerofthe
T‐H2‐DV/T‐H2‐OS.
ItconnectstothecondensatedrainportoftheT‐H2‐DV/T‐H2‐OS
byusingconnectorsneutralizerkit.Refertop.21forthedetails.


TK‐KPWL4

Louver
Termination
TK‐KPWH4

Hood
Termination

Installation
8│Page

WARNINGFORINSTALLATIONS
FORYOURSAFETY,READBEFOREINSTALLATION:
Donotinstalltheheaterwherewater,debrisor
flammablevaporsmaygetintotheflueterminal.
Thismaycausedamagetotheheaterandvoid
thewarranty.


Donothavetheventterminalpointingtoward
anyopeningintoabuilding.Donotlocateyour
heaterinapitorlocationwheregasandwater
canaccumulate.




Donotinstallthiswaterheaterunderan
overhanglessthan3feetfromitstoporeaves.
Theareaunderanoverhangmustbeopento
threesides.(T‐H2‐OSonly)

Donotinstallthewaterheaterventterminator
within1ft.intheUSAofanyairintakeorbuilding
opening,andwithin3ft.inCanadaofanyair
intakeorbuildingopening.(T‐H2‐OSonly)(Refer
top.15)

Donotinstallnexttoadryeroranysourceof
airbornedebristhatcanbetrappedinsidethe
combustionchamber,unlessthesystemisdirect
vented.
Prohibited Prohibited
FORYOURSAFETY,READBEFOREINSTALLATION:

Installation
9│Page
Thedarksquaresindicatethedirectionthe
dipswitchesshouldbesetto.
Leftbankofdipswitches
Leftbankofdipswitches
•Thereisa3”clearancefrom
theleftandrightsidesofthe
unittocombustibleandnon‐
combustible
surfaces.However,ifany
portionorareaofthesurface
isexposedtotheexhaust
fumes(i.e.directlytothesides
oftheventcap),thatsurface
mustbeatleast24”away.
•Keeptheclearances.
2,500 to4,000 ft 4,000to5,000ft
Altitude

HIGH‐ALTITUDEINSTALLATIONS

Checktheelevationwhereyourwaterheaterisinstalled.Setdipswitchesshowninthetablebelow
dependingonthealtitude.Thesedipswitches(No.5andNo.6)areonthecomputerboardontheleft
bankonly.


0to2,500ft
(DEFAULT)

Over5,000ft
SwitchNo.5OFFONOFF
Consult
TAKAGI
Technical
Dept.
at1‐888‐
882‐5244
SwitchNo.6OFFOFFON

T‐H2‐OSINSTALLATION
1. InstalltheT‐H2‐OSonlyinareaswithmild,temperateclimates.
2. TheT‐H2‐OSshallbewall‐mountedormountedonastand.LocatetheT‐H2‐OSinanopen,
unroofedareaandmaintainthefollowingminimumclearances:







DONOTadjustanydipswitchesontherightbank.
12345678
N O
910
N O
12345678910
N O
12345678910
Side3”
Top36”
Side3”
Front24”
Bottom12”
Back0.5”

Installation
10│Page

Improperventingofthisappliancecanresultinexcessivelevelsofcarbonmonoxide
whichcanresultinseverepersonalinjuryordeath.
Wheninstallingtheventsystem,allapplicablenationalandlocalcodesmustbe
followed.Ifyouinstallthimbles,firestopsorotherprotectivedevicesandthey
penetrateanycombustibleornoncombustibleconstruction,besuretofollowall
applicablenationalandlocalcodes.

T‐H2‐DVINSTALLATION

T‐H2‐DVisequippedwithathermistorandhi‐limitswitchfortheexhaustgas,detectingexcess
temperatureswithintheflueandenablingtheunittosafelystopoperationsifneeded.These
componentsarealwaysmonitoringexhaustgasconditionsinordertopreventheatdamagetoPVC
(Plastic)ventingifPVCisused.
Iftheexhaustgastemperatureexceeds140°F,thesecomponentswillenabletheunittosafelystop
operations.(FortheT‐H2‐OSmodel,thesecomponentsarenotavailablesincethere’snoexhaust
ventingrequired.)

•T‐H2‐DVrequiresa4”make‐upintakeairsupply
pipe.Theintakepipemustbesealedairtight.
•AirsupplypipecanbemadeofABS,PVC,
galvanizedsteel,corrugatedstainlesssteel,
orCategorylll/IVstainlesssteel.
•Sidewallventingisrecommendedfor
theT‐H2‐DV.Verticalventing(roof
termination)isacceptable.
•TAKAGIrecommendsrunningthe
exhaustventandtheintakepipeas
parallelaspossible.
•TheTH‐PA01adaptorisusedtomake
theconnectionbetweentheT‐H2‐DV
ventcollarandPVCventpipeeasier
andformaintenancepurposes.

VENTINGINSTRUCTIONS
‐General‐
TheT‐H2‐DVmustbeventedinaccordancewiththesection“VentingofEquipment"ofthelatestedition
oftheNaturalFuelGasCode:TheANSIZ223.1,Allapplicablelocalbuildingcodes,Section7ofthe
CAN/CSAB149.1NaturalGasinCanada,PropaneInstallationCodeinCanada.
TheuseofventingmaterialsapprovedforCategoryIII/IVappliancesisrecommendedwhenever
possible.However,T‐H2‐DVmayalsobeventedwithplasticpipematerialssuchasPVC.Fordetails,
pleaserefertotheExhaustVent(PVCVent)sectiononp.13.VentinstallationsinCanadawhichutilize
plasticventsystemsmustuseventingthatcomplieswithULCS636.
WARNING
Top12”
Side3”
Back0.5”
Side3”
Front4”
(24”Recommended
forMaintenance)
Bottom12”
Keeptheclearances.

Installation
11│Page

‐Exhaustvent(PVC&ABSvent)‐

TheT‐H2‐DVcanbeconnectedwithPVCorABSventing(temperatureratedupto149°F).However,
TAKAGIrecommendsPVC(orABS)ventingcertifiedtoULCS636standards.

ItemMaterialUnitedStatesCanada
Exhaustpipe&
Fittings
Schedule40PVCANSI/ASTMD1785
ULCS636Certified
MaterialsOnly
PVC‐DWVANSI/ASTMD2665
Schedule40CPVCANSI/ASTMF441
Schedule40ABS‐DWV ANSI/ASTMD2661
PipeCement/Primer
PVCANSI/ASTMD2564
CPVCANSI/ASTMF493
ABSANSI/ASTMD2235
NOTE:DoNOTUseCellularFoamCorePipe

•Themaximumlengthofexhaustventpipingmustnotexceed50ft.(deducting5ft.foreach
elbowusedintheventingsystem).Donotusemorethan5elbows.
•Whenthehorizontalventrunexceeds5ft.,supporttheventrunat3ft.intervalswithoverhead
hangars.

DiameterMax.No.ofElbowMax.Vertical&Horizontal(Total)VentLength
4”550ft.

*Foreachelbowadded,deduct5ft.frommax.Ventlength.
No.ofElbowsMax.VerticalorHorizontalLength
050ft.
145ft.
240ft.
525ft.

FordetailsontheventconnectiontotheT‐H2‐DV,refertoP.13.
‐Exhaustvent(Stainlesssteelvent)‐
ThisisaCategoryIVapplianceandmustbeventedaccordingly.Theventsystemmustbesealedair
tight.AllseamsandjointswithoutgasketsmustbesealedwithhighheatresistantsiliconesealantorUL
listedaluminumadhesivetapehavingaminimumtemperatureratingof160°F.Forbestresults,avent
systemshouldbeasshortandstraightaspossible.
•ThisT‐H2‐DVisaCategoryIVapplianceandmustbeventedaccordinglywithany4”vent
approvedforusewithCategoryIII/IVorSpecialBHtypegasvent.
•TAKAGIrecommendsthe“T‐Vent”linemanufacturedbyTAKAGI(RefertoTakagi’s“T‐Vent”
brochurefordetails).However,thefollowingarealsoULlistedmanufacturers:ProTechSystems
Inc.(FasNSeal),Flex‐LInc.,Z‐FlexInc.(Z‐VentIII),Metal‐FabInc.,andHeat‐FabInc.(Saf‐TVent).
•Followtheventpipemanufacturer’sinstructionswheninstallingtheventpipe.

Installation
12│Page
Improperinstallationcancausenauseaorasphyxiation,severeinjuryordeathfrom
carbonmonoxideandfluegasespoisoning.Improperinstallationwillvoidproduct
warranty.
•Donotcommonventthisappliancewithanyotherventedappliance(Donotterminatevent
intoachimney.Iftheventmustgothroughthechimney,theventmustrunallthewaythrough
thechimneywithCategoryIII/IVapprovedorSpecialBHventpipe).
•Themaximumlengthofexhaustventpipingmustnotexceed50ft.(deducting5ft.foreach
elbowusedintheventingsystem).Donotusemorethan5elbows.
•Whenthehorizontalventrunexceeds5ft.,supporttheventrunat3ft.intervalswithoverhead
hangars.

DiameterMax.No.ofElbowMax.Vertical&Horizontal(Total)VentLength
4”550ft.

*Foreachelbowadded,deduct5ft.frommax.Ventlength.
No.ofElbowsMax.VerticalorHorizontalLength
050ft.
145ft.
240ft.
525ft.


‐Venttermination‐

•Theventterminatorprovidesameansofinstallingventpipethroughthebuildingwallandmustbe
locatedinaccordancewithANSIZ223.1/NFPA54,orinCanadawithCAN/CSA‐B149.1andlocal
applicablecodes.
•Apropersidewalldirect‐ventterminatorisrecommendedwhenthewaterheaterisventedthrougha
sidewall.

GeneralrulesforventingtheT‐H2‐DVwaterheaterare:
1. Placethewaterheaterascloseaspossibletotheventterminator.
2. TheventcollarofthewaterheatermustbefasteneddirectlytoanunobstructedventpipeorTH‐
PA01adaptor.
3. Donotweldtheventpipetothewaterheatercollar.
4. Donotcuttheventcollaroftheunit.
5. Theweightoftheventstackmustnotrestonthewaterheater.
6. Theventmustbeeasilyremovablefromthetopofthewaterheaterfornormalserviceand
inspectionoftheunit.
7. Thewaterheaterventmustnotbeconnectedtoanyothergasapplianceorventstack.
8. Avoidlocatingthewaterheaterventterminatornearanyairintakedevices.Thesefanscanpick
uptheexhaustflueproductsfromthewaterheaterandreturnthemtothebuilding.Thiscan
createahealthhazard.
9. Avoidusinganoversizedventpipeorusingextremelylongrunsofthepipe.
10. Locatetheventterminatorsothatitcannotbeblockedbyanydebris,atanytime.Mostcodes
requirethattheterminatorbeatleast12inchesabovegrade,buttheinstallermaydetermineifit
shouldbehigherdependingonthejobsiteconditionandapplicablecodes.
11. Forrooftopventing,araincaporotherformofterminationthatpreventsrainwaterfromentering
intothewaterheatermustbeinstalled.
WARNING

Installation
13│Page
‐PVCVentingIllustrations‐
<HowtoinstallPVCventingwiththeT‐H2‐DV>
1. ConnecttheTH‐PA01PVCadaptor*directlyontheexhaustventcollaroftheT‐H2‐DV.
2. Connecta4”PVCcouplertotheTH‐PA01PVCadaptor.
3. Fromthecoupler,continueontherestoftheventrunwith4”PVCpipe.
<HorizontalInstallationDiagram><VerticalInstallationDiagram>
RoofFlashing
Roof
Firestop
Connectionbetween
exhaustventcollar
andPVCpiping
Seebelowfor
instructions.
Wall
ExhaustventcollaroftheT‐H2‐DV
(Female)
TH‐PA01PVCadaptor*
4”PVCcoupler
4”PVCStraightpipe
*TH‐PA01PVCadaptorisincludedwiththeT‐H2‐DV.

Connectionbetweenexhaustventcollarand
PVCpiping
Seebelowforinstructions.

Installation
14│Page
‐StainlesssteelVentingillustrations‐
•Regardingtheclearancesfromtheexhaustterminatortotheairinletoropening,refertothe
nextfewpages.
•Followallventsystemmanufacturer’sinstructionsandalllocalcodes.
•DonotcommonventorconnectanyventfromotherappliancestotheT‐H2‐DVvent.
•Use4”CategoryIII/IVapprovedorSpecialBH,singleordoublewallstainlesssteelventpipe.
VerticalInstallationDiagram
HorizontalInstallationDiagram
Wall
Sidewall
Vent
Terminator
RoofFlashing
Roof
RainCap
Firestop

Installation
15│Page

‐Ventclearances‐

Canada U.S.A
Directventand
otherthanDirect
Vent
DirectventOtherthanDirectVent
AClearanceabovegrade,veranda,porch,deck,
orbalcony.1foot1foot1foot
BClearancetowindowordoorthatmaybe
opened.3feet1foot
4feetfrombeloworside
opening.1footfrom
aboveopening.
CClearancetopermanentlyclosedwindow * * *
D
Verticalclearancetoventilatedsoffitlocated
abovetheventterminatorwithinahorizontal
distanceof2feet(61cm)fromthecenterline
oftheterminator.
***
EClearancetounventilatedsoffit* * *
FClearancetooutsidecorner* * *
GClearancetoinsidecorner* * *
HClearancetoeachsideofcenterlineextended
abovemeter/regulatorassembly3feet**
IClearancetoserviceregulatorventoutlet. 3feet * *
J
Clearancetonon‐mechanicalairsupplyinlet
tobuildingorthecombustionairinlettoany
otherapplication.
3feet1foot
4feetfrombeloworside
opening.1footfrom
aboveopening.
KClearancetomechanicalairsupplyinlet. 6feet 3feet 3feet
LClearanceabovepavedsidewalkorpaved
drivewaylocatedonpublicproperty.7feet*7feet
MClearanceunderveranda,porchdeck,or
balcony.1foot**
*ForclearancesnotspecifiedinANSIZ223.1/NFPA54orCAN/CSA‐B149.1,pleaseuseclearancesinaccordancewith
localinstallationcodesandtherequirementofthegassupplier.

Installation
16│Page
‐Additionalclearances‐
Pleasefollowalllocalandnationalcodesinregardstoproperterminationclearances.Intheabsenceof
suchcodes,thefollowingclearancescanbeusedasguidelines.Localcodessupersedetheseguidelines.
Forsidewallterminations

Exhausttermination
1ft.
1ft.2ft.
Inside
corner
Formultiplesidewallexhaust
terminations(e.g.multi‐unit
systems),anexhausttermination
mustbeatleast1ft.awayfrom
anotherexhausttermination.An
exhaustterminationmustalsobe
atleast2ft.awayfromaninside
corner(iftheadjacentwallisless
than2ft.oflength,theminimum
requireddistanceawayfromthe
insidecornerwillbeequaltothe
lengthofthatadjacentwall).
Fordirect‐ventsidewall
terminationsthatusetwo
separatepenetrationsforthe
intakeandexhaust,distance
theintakeandexhaust
terminationsatleast3ft.away
fromeachother,nomatterthe
orientation.
Formultiple‐unit,direct‐ventsidewall
terminationsthatcombinetheintake
andexhaustintoasinglepenetration,
spaceeachdirect‐ventterminationat
least1ft.awayfromeachother,no
mattertheorientation.Adirect‐vent
terminationmustalsobeatleast2ft.
awayfromaninsidecorner(ifthe
adjacentwallislessthan2ft.of
length,theminimumrequired
distanceawayfromtheinsidecorner
willbeequaltothelengthofthat
adjacentwall).
Formultiple‐unitrooftopterminations(whetherforstandardindooror
direct‐ventinstallations)spaceallexhaustandintaketerminationsin
accordancewithlocalcodes.Anexhaustterminationmustbespacedfrom
awallorsurfaceinaccordancewithlocalcodesaswell.Intheabsenceof
suchacode,anexhaustterminationmustbeahorizontaldistanceofat
least2ft.awayfromawallorsurface.
A:inaccordancewithlocalcodes
Forrooftopterminations
Airintake
Exhaust termination
A
A
A
A
A
2ft.
Airintake
Exhaust
termination
Exhaustand/ordirect‐vent
sidewallterminationsshould
beatleast2ft.awayfroman
oppositesurface/wall.Do
notplacethetermination
directlyinfrontofan
openingintoabuilding.
2ft.
Exhaust
termination
Airsupplyinlet
3ft.
3ft.
3ft.
Directventtermination
1ft.
1ft.
Inside
corner
2ft.

Installation
17│Page



1. Turnoffallelectricpowertothewaterheaterifserviceistobeperformed.
2. Turnthemanualgasvalvelocatedontheoutsideoftheunitclockwise3totheoffposition.
•Ensurethatanyandallgasregulatorsusedareoperatingproperlyand
providinggaspressureswithinthespecifiedrangeshownbelow.Excessgas
inletpressuremaycauseseriousaccidents.
•Conversionofthisunitfromnaturalgastopropaneorviseversacannotbe
doneinthefield.Contactyourlocaldistributortogetthecorrectunitforyour
gastype.ConversiondonebyanyoneotherthanthemanufacturerorTakagi
ServiceRepresentativewillvoidallwarranty.Takagiisnotliableforany
propertyand/orpersonaldamageresultingfromunauthorizedconversions.

GASSUPPLYANDGASPIPESIZING

*Checkthatthetypeofgasmatchestheratingplatefirst.
1. Theminimumandmaximuminletgaspressuresare:
GastypeInletgaspressure
NaturalGasMin.5.0”WC–Max.10.5”WC
PropaneGasMin.8.0”WC–Max.14.0”WC
2. GaspressurebelowthisspecifiedrangefortheT‐H2‐DV/T‐H2‐OSand/orinsufficientgasvolume
willadverselyaffectperformance.ThesepressuresaremeasuredwhentheT‐H2‐DV/T‐H2‐OSisin
fulloperation.
3. Inletgaspressuremustnotexceedtheabovemaximumvalues;gaspressureabovethespecified
rangewillcausedangerousoperatingconditionsanddamagetotheunit.
4. Untiltestingofthemaingaslinesupplypressureiscompleted,ensurethegaslinetotheT‐H2‐
DV/T‐H2‐OSisdisconnectedtoavoidanydamagetothewaterheater.

‐Measuringinletgaspressure‐

TheT‐H2‐DV/T‐H2‐OScannotperformproperlywithoutsufficientinletgaspressure.Beloware
instructionsonhowtochecktheinletgaspressure.THISISONLYTOBEDONEBYALICENSED
PROFESSIONAL.

1. Shutoffthemanualgasvalveonthesupplygasline.
2. Removethescrewforthepressureportlocatedonthegas
inletoftheT‐H2‐DV/T‐H2‐OSshowninthediagramtothe
right.
3. Connectthemanometertothepressureport.

WARNING
TOTURNOFFGASTOAPPLIANCE

Installation
18│Page
Sizethegaspipeappropriatelytosupplythenecessaryvolumeofgasrequiredforthe
T‐H2‐DV/T‐H2‐OS(199,000BTU/hforbothNaturalGasandLiquidPropane)using
ANSI233.1/NFPA54intheUSAorCAN/CSAB149.1inCanadaorlocalcodes.
Otherwise,flowcapabilitiesandoutputtemperatureswillbelimited.

4. Re‐openthemanualgasvalve.Checktoseethattherearenogasleaks.Opensomeofthefixtures
thatusethehighestflowratetoturnontheT‐H2‐DV/T‐H2‐OS.
5. Checktheinletgaspressure.WhenT‐H2‐DV/T‐H2‐OSisonmaximumburn,themanometershould
readfrom5.0”to10.5”WCforNaturalgas,from8.0”to14.0”WCforLiquidPropane.





1. Installamanualgasshut‐offvalvebetweentheT‐H2‐DV/T‐H2‐OSandthegassupplyline.
2. Whenthegasconnectionsarecompleted,itisnecessarytoperformagasleaktesteitherby
applyingsoapywatertoallgasfittingsandobservingforbubblesorbyusingagasleakdetection
device.
3. Alwayspurgethegaslineofanydebrisand/orwaterbeforeconnectingtothegasinlet.

‐NaturalGasSupplyPiping‐
MaximumDeliveryCapacityofCubicFeetofGasperHourofIPSPipeCarryingNaturalGasof0.60SpecificGravity
BasedonPressureDropof0.5”WC

BasedonEnergyContentof1000BTU/CubicFt.:T‐H2‐DV/T‐H2‐OSrequires199CubicFt./hr.
Unit:CubicFeetperHour
PipeSizeLengthinFeet
Inches10’20’30’40’50’60’70’80’90’100’125’150’200’
¾”363249200171152138127118111104938472
1”684470377323286259239222208197174158135
1¼”1,404965775663588532490456428404358324278
1½”2,1031,4451,161993880798734683641605536486416
2”4,0502,7842,2351,913 1,696 1,536 1,413 1,315 1,2341,1651,033 936801
‐Propane(LP)GasSupplyPiping‐
MaximumCapacityofPropane(LP)GasBasedon11”WCsupplypressureata0.5”WCpressuredrop
Unit:kBTUperHour
PipeSize LengthinFeet
Inches 10’20’30’40’50’60’70’80’90’100’125’150’200’
¾”567393315267237217196185173162146132112
1”1,071732590504448409378346322307275252213
1¼”2,2051,4961,2121,039 913834771724677630567511440
1½”3,3072,2991,8581,559 1,417 1,275 1,181 1,086 1,023 976866787675
2”6,2214,3313,4652,992 2,646 2,394 2,205 2,047 1,921 1,8111,606 1,496 1,260

Formoreinformation,pleaseseethenextpage.


Installation
19│Page



Donotusethiswaterheaterifanyparthasbeensubmersedunderwater.Immediatelycalla
licensedprofessionaltoinspectthewaterheaterandtoreplaceanydamagedparts.
WATERCONNECTIONS
1. Allpipes,pipefittings,valvesandothercomponents,includingsolderingmaterials,mustbe
suitableforpotablewatersystems.
2. Amanualshutoffvalvemustbeinstalledonthecoldwaterinlettothewaterheaterbetweenthe
mainwatersupplylineandtheT‐H2‐DV/T‐H2‐OS.
3. Inaddition,amanualshutoffvalveisalsorecommendedonthehotwateroutletoftheunit.Ifthe
T‐H2‐DV/T‐H2‐OSisinstalledwithin,orsubjectedto,aclosedloopwatersystem,athermal
expansiontankmustbeinstalled.
4. Beforeinstallingthewaterheater,flushthewaterlinetoremovealldebris,andafter
installationiscomplete,purgetheairfromtheline.Failuretodosomaycausedamagetothe
heater.
5. Thereisawiremeshfilterwithinthecoldinlettotrapdebrisfromenteringyourheater.Thiswill
needtobecleanedperiodicallytomaintainflow.
BasedonEnergyContentof1000BTU/CubicFt:

Divideeachappliance’sBTUrequirementby1000BTUtoget
theappliancesCubicFt.requirement.

Takagiintoaccountthedistancetheapplianceisfromthegas
meter,lookintheabovegascharttoproperlysizetheline.

Forsectionsofthegaslinesupplyinggastomorethanone
appliance(Ex:PointAtoPointB),addupthecubicft.
requirementsoftheappliancesthatarebeingsuppliedbythat
section,andsizetothefarthestappliance.

ForExample:ThesectionfromAtoBsuppliesgastothe
furnace,range,anddryer.AddinguptheBTUrequirements
anddividingby1000yieldsacubicft.requirementof220
cubicft.ofgas.Thefarthestapplianceistherange,whichis50
ft.awayfromthemeter.Lookingattheabovechart,and
underthecolumnof50ft.,SectionAtoBneedstobe1”in
ordertosupply220cubicft.
Donotreversethehot
outletandcoldinlet
connectionstotheT‐H2‐
DV/T‐H2‐OSWaterHeater.
Thiswillnotproperlyactive
thewaterheater.
FORYOURSAFETY,READBEFOREOPERATING:
10’Length
1”PipeSizeC
GasSizingExample
(NaturalGas)
10’Length
3/4”PipeSize
15’Length
1/2”PipeSize
10’Length
1/2”PipeSize
Furnace
120,000BTU
T‐H2‐DV/
T‐H2‐OS
199,000BTU
5’Length
1‐1/4”PipeSize
Range
65,000BTU
10’Length
3/4”PipeSize
Dryer
35,000BTU
15’Length
1”PipeSize
5’Length
1‐1/4”PipeSize
GasMeter
B
A
CAUTION
Condensate drainport
Wateroutlet
(HOT)
Waterinlet
(COLD)
GAS inlet

Installation
20│Page

PRESSURERELIEFVALVE
TheT‐H2‐DV/T‐H2‐OShasahigh‐temperatureshutoffswitchbuiltinasastandardsafetyfeature(called
aHi‐Limitswitch)thereforea“pressureonly”reliefvalveisrequired.
1. Thisunitdoesnotcomewithanapprovedpressurereliefvalve.
2. Anapprovedpressurereliefvalvemustbeinstalledonthehotwateroutlet.
3. Thepressurereliefvalvemustconformto
ANSIZ21.22orCAN1‐4.4andinstallation
mustfollowlocalcode.
4. Thedischargecapacitymustbeat
least199,000BTU/h.
5. Thepressurereliefvalveneedstobe
ratedforamaximumof150psi.
6. Thedischargepipingforthepressurereliefvalvemust
bedirectedsothatthehotwatercannotsplashon
anyoneoronnearbyequipment.
7. Attachthedischargetubetothepressurereliefvalveandruntheendofthetubetowithin6"
fromthefloor.Thisdischargetubemustallowfreeandcompletedrainagewithoutany
restrictions.
8. IfthepressurereliefvalveinstalledontheT‐H2‐DV/T‐H2‐OSdischargesperiodically,thismaybe
duetoadefectivethermalexpansiontankordefectivepressurereliefvalve.
9. Thepressurereliefvalvemustbemanuallyoperatedperiodicallytocheckforcorrectoperation.
CONDENSATEDRAIN
•TheT‐H2‐DV/T‐H2‐OSdoesnotincludeabuilt‐incondensateneutralizercartridgeforreducingthe
pHlevelofcondensatewater.Iflocalcodesdictatethatcondensatemustbeneutralizedpriorto
drainage,acondensateneutralizermustbeinstalled.Asanoption,TakagiofferstheTH‐NT01
Neutralizerassembly(soldseparately).
•Intheabsenceofapplicablelocalcodesandregulations,TAKAGIrecommendsthatcondensatebe
disposedofintoastandarddrain.Connectadraintubefromthecondensatedrainport(shown
below)locatedonthebottomoftheT‐H2‐DV/T‐H2‐OStoastandarddrain.


Pressure
ReliefValveHot
outle
t

Cold
inle
t

Gas
AsCloseas
Possible
•Followallcoderequirements
ofthelocalauthorityon
condensateneutralizersand
whetherornottheyare
requiredfortheinstallation.

Condensate drainport