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

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………………….…………………….



2

3

4

5

6

7

8

9



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

’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.

When



the



tap



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

GasValve

Flowsensor

Watercontrolvalve

assvalve

Intake

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

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

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)



:1

Qty:1

: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

•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

910

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.

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