Takagi T?K4?OS Installation Manual And Owner's Manual



‐Do not store or use gasoline or  other

flammablevaporsandliquidsinthevicinityof

thisoranyotherappliance.

‐WHATTODOIFYOUSMELLGAS

• Donottrytolightanyappliance.

• Do not touch any electric switch, do not

useanyphonein

yourbuilding.

• Immediately callyourgassupplierfroma

neighbor's phone. Follow the gas

supplier'sinstructions.

• Ifyoucannotreachyourgassupplier, call

thefiredepartment.

‐Installation and service must be performed

byaqualifiedinstaller,serviceagencyorthe

gassupplier.



TAKAGI



FEATURING

• ENDLESSHOTWATER

• ONDEMANDUSAGE

• COMPACT,SPACESAVING

• ENERGYCONSERVATION

• COMPUTERIZEDSAFETY

• NOPILOTLIGHT

• EASY‐LINKSYSTEM(OnlyT‐D2‐IN&T‐D2‐OS)

GasTanklessWaterHeater

Suitablefor p otablewaterheatingandspace‐heating

*

*Pleaserefertolocalcodesforspace‐heatingcompliance.

Ifyouhaveanyquestions,please

callorwriteto:

5Whatney

Irvine,CA92618

TollFree:1‐888‐882‐5244

On‐DemandWaterHeater

InstallationManualandOwner’sGuide

Model

・T‐KJr2‐IN・T‐KJr2‐OS

・T‐K4‐IN・T‐K4‐OS

・T‐D2‐IN・T‐D2‐OS

WARNING

Iftheinformationinthese

instructionsisnotfollowed

exactly,afireorexplosion

mayresultcausing

propertydamage,personalinjuryordeath.

“ANSIZ21.10.3”

and“CSA4.3”

OnlyT‐D2models

Contents

2│Page

CONTENTS







SPECIFICATIONS…………………………………………………………………………………………..………………………...

INTRODUCTION…………………………………………………………………………………………………..………………….

SAFETYGUIDELINES…………….………………………………………………………………………………………..………..

INSTALLATION………………………………………………………………………………………………..…………………..….

General………………………………………………………………………………………………………………………..…..…

Clearances……………………………………………………………………… ……………………………………………………

IncludedAccessories…………….………………………………………………………………………………………..…..

OptionalItems……………………………………………………………………………………………………………………..

High‐AltitudeInstallations……………………………………………………………………………………………………

VentingInstructions…………………………………………………………………………………………………………….

GasSupplyandGasPipeSizing………......................................................................................…

WaterConnections……………..…………………………………………………………………………………………….…

ElectricalConnections……………………………………………………………………..…………………………….......

RemoteControllerConnections.……..……………………………………………………………………………….…

PumpControlMode(OnlyT‐D2‐IN&T‐D2‐OS)………………………….……………………………….………

Easy‐LinkSystem(OnlyT‐D2‐IN&T‐D2‐OS)…….……………………...…………………………………..…....

APPLICATIONS...………………………………………………………………………………………………………………………

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…………………………………………………………………………………………...…

PRODUCTREGISTRATIONANDLIMITEDWARRANTY…………....…………………………………………….…

…



3

4

5

6

8

9



InstallationManual

Owne

’sGuide

Specifications

3│Page



SPECIFICATIONS

Model T‐KJr2‐IN T‐KJr2‐OS T‐K4‐IN T‐K4‐OS T‐D2‐IN T‐D2‐OS

NaturalGasInput

(OperatingRange)

Min:19,500Btu/h

Max:140,000Btu/h

Min:11,000Btu/h

Max:190,000Btu/h

Min:11,000Btu/h

Max:199,000Btu/h

PropaneInput

(OperatingRange)

Min:19,500Btu/h

Max:140,000Btu/h

Min:11,000Btu/h

Max:190,000Btu/h

Min:11,000Btu/h

Max:199,000Btu/h

GasConnection ¾”NPT

WaterConnections

¾”NPT

WaterPressure 15‐150psi*

NaturalGas

InletPressure

Min.5.0”WC

Max.10.5”WC

Propane

InletPressure

Min.8.0”WC

Max.14.0”WC

Manifold

Pressure**

Natural 2.0”WC 2.5”WC 2.0”WC 2.5”WC 2.0”WC 2.5”WC

Propane 2.5”WC 3.1”WC 3.7”WC 4.0”WC 3.7”WC 4.5”WC

Weight 28.7lbs. 34.6lbs.

Dimensions

H20.5”xW13.8”xD6.7”

 H20.5”xW13.8”xD8.5”

Ignition ElectricIgnition

Electric

Supply 120VAC/60Hz

Consumption

Operation

73.1W/0.61A 87.6W/0.73A 89.8W/0.75A

Standby 6.2W/0.05A 6.2W/0.05A 6.2W/0.05A

Freeze‐

Protection

111W/0.93A 111W/0.93A 111W/0.93A

*40psioraboveisrecommendedformaximumflow.

**TheManifoldPressureisthefactorysettingandgenerallyshouldnotneedadjustment.

NOTE:

• Checktheratingplatetoensurethisproductmatchesyourspecifications.

• InaccordancewithANSIZ21.10.3,COemissiondoesnotexceed400PPMfor

normalinput.

• Themanufacturerreservestherighttodiscontinue,orchangeatanytime,

specificationsordesignswithoutnoticeandwithoutincurringobligations

.



Introduction

4│Page

INTRODUCTION

*Thisdiagram

illustratestankless

waterheaterdesign

conceptsonlyand

doesnotaccurately

representtothewater

heater’sphysical

description.

• This manual provides information necessary for the installation, operation, and

maintenanceofthewaterheater.

• Themodeldescriptionislistedontheratingplatewhichisattachedtothefront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 the

manufactureroritslocalrepresentative.

• Thisequipmentisanon‐demand,tanklesswaterheaterdesignedtoefficientlysupply

endlesshotwaterforyourneeds.

• Theprinciplebehindtanklesswaterheaters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initia testhefanmotorandsendsasignaltotheignitertocreateanignition

spark.

5. Thegasignitesandflames

appearwithintheburnerchamber.

6. Watercirculatesthroughtheheatexchangerandthengetshot.

7. Usingthermistorstomeasuretemperaturesthroughoutthewaterheater,thecomputer

modulatesthegasandwatervalvestoensureproperoutputwatertemperature.

8. Whentheta

isturnedoff

theunitshutsdown.

• The T‐KJr2‐IN, T‐K4‐IN, & T‐D2‐IN are to be only installed indoor (direct‐vent

convertible).TheT‐KJr2‐OS,T‐K4‐OS,&T‐D2‐OSaretobeonlyinstalledoutdoor.

SafetyGuidelines

5│Page



• Watertemperaturesover125°F (52

C) cancausesevereburnsinstantlyordeath

fromscalding. The water temperatureisset at 122°F (50°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fl ammables,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. 20 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 disco nnect  the electrical supply if the  ambient temperature will drop

belowfreezing.TheFreezePreventionSystemonlyworksiftheunithaselectrical

power.Thew a rrantywillnotbecoverediftheheatexchangerisdamageddueto

freezing.RefertothesectionontheFreezePreventionSystemon

p.35formore

information.

SAFETYGUIDELINES



SAFETYDEFINITIONS

Indicatesanimminentlyhazardoussituationwhich,ifnotavoided,willresultin

deathorseriousinjury.

Indicatesanimminentlyhazardoussituationwhich,ifnotavoided,couldresult

indeathorseriousinjury.

Indicatesanimminentlyhazardoussituationwhich,ifnotavoided,couldresult

inminorormoderateinjury.

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the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.7).

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 the



manufacturer.

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.

WARNING

CAUTION

DANGER

WARNING

Installation

6│Page

INSTALLATION

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. 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.



3. Themanifoldgaspressureispresetatthefactory.Itiscomputercontrolledandshouldnot

needadjustment.



4. Maintainproperspaceforservicing.Installtheunitsothatitcanbeconnected

orremoved

easily.RefertotheClearancesSectiononp.8forproperclearances.



5. Thewaterheatermustbeinstalledinalocationwheretheproperamountofcombustibleair

willbeavailabletoitatalltimeswithoutobstructions.



6. Theelectricalconnectionrequiresameansofdisconnection, toterminatepowertothewater

heaterforservicingandsafetypurposes.



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).



8. 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.



9. Ifyouwillbeinstallingthewaterheater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waterheater.



10. FortheT‐KJr2‐IN,T‐K4‐IN,andT‐D2‐INmodels:

• Theseunitsmaybeconv ertedtoadirect‐vent(sealedcombustion)appliancebyinstalling a

direct‐ventconversionkit(PartNo. TK‐TV10)whichwillbringinallrequiredcombustibleair

from outside the building.When

 installing the TK‐TV10 conversion kit, please follow all

instructionsincludedwiththekit.

• Ifthewaterheaterisusedasadirect‐ventappliance, theunitrequiresa3”combustibleair

supply pipe. Theintakepipe mustbesealed airtight. Air supply pipe can bemadeof ABS,

PVC, galvanized steel, corrugated aluminum, corrugated stainless steel or Category III

stainlesssteel.

• Terminatingtheventingthroughasidewallisrecommendedforthedirect‐ventsystem.

• Runningtheexhaustventandtheintakepipeparallelisrecommended.

• Terminating the exhaust and intake on the same wall / surface

 is recommended.

Terminating in the same pressure zone allows for pressure balancing, which prevents

nuisanceshutdowns.



11. ForT‐KJr2‐OS,T‐K4‐OS,&T‐D2‐OS:

• Tobeinstalledoutdoorsandonlyinareaswithmild,temperateclimates.

Installation

7│Page

• Installation and service must be performed by a qualified installer (for

example, a licensed plumber or gas fitter), otherwise the warranty will be

void.

• Theinstaller(licensedprofessional)is responsibleforthecorrec tinstallation

of the water heater and for compliance with all national, state/provincial,

andlocalcodes.

• Themanufacturerdoesnotrecommendinstallingthewaterheaterinapitor

locationwheregasandwatercanaccumulate.

• Do nothavetheventterminalpointingtowardanyoperatingwindow,door,or

openingintoabuilding.

• Do  not install next to any source  of airborne  debris, such as a clothes dryer,

that can cause debris to be trapped inside the combustion chamber, unless

thesystemisdirect‐vented.

• The manufacturer does not recommend  installing the water heater in an

atticduetosafetyissues.Ifyouinstallthewaterheaterinanattic:



• Makesuretheunitwillhaveenoughcombustionairandproperventilation.

• Keep the area around the water heater clean. When dust collects on the

flamesensor,thewaterheaterwillshutdownonanerrorcode.



• If the above conditions cannot be met, use the direct vent conversion kit

TK‐TV10.



• Placetheunitforeasyaccessforserviceandmaintenance.

• A drain pan, or other means of protection  against water  damage, is

uiredtobeinstalledunderthewaterheaterincaseofleaks.

• 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.

• Do notinstalltheunitwherewater,debris,orflammablevaporsmaygetinto

theflueterminal.

• The manufacturer recommends using the direct vent kit when the water

heater is inst alled ina beauty salon. Somechemicalsusedinabeauty salon

mayaffecttheflamesensor.Waterheatermaynotworkproperly.

• Although the water heater is designed to operate with minimal sound, the

manufacturer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leaka ge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.Themanufacturer

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.



CAUTION

WARNING

Installation

8│Page



CLEARANCES



Model Top Bottom Front Back Sides

T‐KJr2‐IN* 12” 12” 24” 1” 2“

T‐KJr2‐OS 36” 12” 24” 1” 2“



Model Top Bottom Front Back Sides

T‐K4‐IN* 12” 12” 24” 1” 2“

T‐K4‐OS 36” 12” 24” 1” 2“



Model Top Bottom Front Back Sides

T‐D2‐IN* 12” 12” 24” 1” 2“

T‐D2‐OS 36”  12” 24” 1” 2“

*Standardindoorinstallations&direct‐ventindoorinstallationshavethesameclearances.



INCLUDEDACCESSORIES



Checkthattheseitemsbelowareincludedwiththewaterheater.



1. Installation Manual &

Owner’sGuide



2.

ProductRegistrationCard

 3.CommunicationCable

(OnlyT‐D2‐IN&T‐D2‐OSmodels)



Qty:1

Bottom

Side

Top

Side

Front

Back

Maintain all clearances around

thewaterheater.

Installation

9│Page



OPTIONALITEMS

Model T‐KJr2‐IN T‐KJr2‐OS T‐K4‐IN T‐K4‐OS T‐D2‐IN T‐D2‐OS

TK‐RE02

✔ ✔ ✔ ✔

 

TM‐RE30    

✔ ✔

TK‐BF01

✔



✔



✔



TK‐TV10

✔



✔



✔



TK‐PC01  

✔ ✔ ✔ ✔

TK‐PCJr2

✔ ✔

   

TK‐RB02 

✔



✔



✔

TK‐KPWL4

TK‐KPWH4

✔



✔



✔



TK‐KPCT43

✔



✔



✔



1.TemperatureRemoteController:TK‐RE02

The Temperature Remote

Controllerhastwofunctions.It

allowstheoutputtemperature

from the water heater to be

adjusted within the range of

99 °F to 167 °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 99°F, 100°F,

102°F, 104°F, 106°F, 108°F, 109°F, 111°F, 113°F,

115°F, 117°F, 122°F, 131°F, 140°F, 158°F, and

167°F. See the trouble shooting section for

informationonpossibleerrorcodes.

2.TemperatureRemoteController:TM‐RE30 

The Temperature Remote

Controller has

 two functions. It

allows the output temperature

from the water heater to be

adjustedwithin therangeof99

°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

99°F, 100°F, 102°F, 

104°F, 106°F, 108°F, 110°F, 111°F, 113°F, 115°F,

117°F, 122°F, 131°F, 140°F, 149°F, 158°F, 167°F,

176°Fand185°F.Seethetroubleshootingsection

forinformationonpossibleerrorcodes.

3.BackflowPreventer:TK‐BF01

The Backflow preventer prevents

the backflow of air through the

exhaust vent. This helps prevent

harmful exhaust gases from

entering the home, as well as

helpingtopreventtheunitfromfreezing inareas

where cold air can be blown or drawn into the

exhaust system.

 Install this vent damper in

accordance with the installation instructions and

anyapplicablecodes.



4.Direct‐VentConversionKit:TK‐TV10

Thiskitcanbeusedto

convertthewater

heaterfroma

standardventsystem

toadirect‐vent(or

sealedcombustion)

system.Installthis

conversionkitinaccordancewiththeinstallation

instructionsandanyapplicablecodes.

Installation

10│Page

5.PipeCovers:TK‐PC01andTK‐PCJr2

The pipe cover protects the

plumbingpipestothewaterheater

from unexpected adjustments.

This pipe cover is fixed to the

bottom of the water heater, which

hides the plumbing and improves 

the visual aspects of the whole

installationforthewater

heater.

6. Recessbox:TK‐RB02

TheRecessboxwillallowfor

“clean”installations.Thewater

heaterfitsinsidetherecessbox,

whichhidesandprotectsthe

wholewaterheaterandplumbing.

TheRecessboxwillfitin‐between

mostwallstuds.

7.T‐VentWallThimblewithTermination:TK‐KPWL4andTK‐KPWH4



Theseterminationsareusedwhenventingoutthroughthewall

andarecompatiblewiththeT‐Ventpipesystem.

Theseterminationsarespecialstainlessstee lventsforgas

appliancesandareULlistedasCategoryII,II IandIV.Thereare

twotypesofterminations:theLouverterminationandtheHood



termination.Fordifferentwallthicknesses,therearetworanges

oflength savailable(refertotheT‐Ventbrochurefordetails).

Installtheseventterminat ionsinaccordancewiththeir

installationinstructi on sandanyapplicable localcodes.



8.Direct‐VentConcentricTermination:TK‐KPCT43



Usedwhenterminatingdirect‐vent(sealed‐combustion)systems,

withdirect‐ventmodelsthatrequirea3”intakeand a4”exhaust.

Thisconcentricterminationprovidestheconvenienceofonly

havingtomakeonepenetrationthroughasidewallinsteadoftwo

separatepenetrationsfortheintakeandexhaustpiping.The

terminationincludes

abirdscreen,restrictingsmallanimals,

pests,andforeignobjectsfromenteringintotheventsystem.

Thissidewallterminationisavailableinthreedifferentsizes,to

coverallrangesofwallthicknesses.

Direct‐ventConcentricTermination

Part# Coveringwallthickness

TK‐KPCT43‐1 3.9”–7.1”

TK‐KPCT43‐2 6.9”–10.1”

TK‐KPCT43‐3 9.8”–13.0”

Louver

Termination

TK‐KPWL4

Hood

Termination

TK‐KPWH4

Installation

11│Page

• DONOTadjustanydipswitchesontherightbankfortheT‐D2‐IN/OS

models.

• Thedarksquaresindicatethedirectionthedipswitchesshouldbesetto.

Dipswitches

HIGH‐ALTITUDEINSTALLATIONS



Checktheelevationwhereyourwaterheaterisinstalled.Setdipswitchesshowninthetablebelow

dependingonthealtitude.



Altitude

0to2,000ft

(DEFAULT)

2,000to4,000ft

4,000to6,000ft Over6,000ft

SwitchNo.3 OFF

ON

OFF

Consult

our Technical

Services

Department

at1‐888‐

882‐5244

SwitchNo.4 OFF

OFF

ON



Altitude

0to2,000ft

(DEFAULT)

2,000to4,000ft

4,000to6,000ft Over6,000ft

SwitchNo.4 OFF

ON

OFF

Consult

our Technical

Services

Department

at1‐888‐

882‐5244

SwitchNo.5 OFF

OFF

ON

T‐KJr2‐IN/OS&T‐K4‐IN/OS

T‐D2‐IN/OS(Leftbankofdipswitches)

T‐KJr2‐IN

OS&T‐K4‐IN

OSCom

uterboard

WARNING

T‐D2‐IN

OSCom

uterboard

Leftbankofdipswitches

Installation

12│Page

Improperventingofthisappliancecanresultinexcessivelevelsofcarbon

monoxidewhichcanresultinseverepersonalinjuryordeath.



Improperinstallationcancausenauseaorasphyxiation,severeinjuryordeathfrom

carbonmonoxideandfluegasespoisoning.Improperinstallationwillvoidproduct

warranty.



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.



VENTINGINSTRUCTIONS

‐General‐

Thewaterheatermustbe vented inaccordancewith thesection“Ventingof Equipment" ofthelatest

editionoftheNationalFuelGasCode:ANSIZ223.1/NFPA54intheUnitedStatesand/orSection7ofthe

CAN/CSA B149.1 Natural Gas and Propane Installation Code in Canada, as well

 as applicable local

buildingcodes.



The manufacturer recommends the “T‐Vent” line manufactured by TAKAGI (Refer to “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).



Generalrulesforventingwaterheatersare:

• Placethewaterheaterascloseaspossibletotheventterminator.

• Thevent coll arofthewaterheatermustbefasteneddirectlytoanunobstructedventpipe.

• Donotweldtheventpipetothewaterheater’sventcollar.

• Donotcuttheventcollaroftheunit.

• Theventmustbeeasily removablefromthetopofthewaterheaterfornormalserviceand

inspectionoftheunit.

• Thewaterheaterventmustnotbeconnectedtoanyothergasapplianceorventstack.

• Avoid

usinganoversizedventpipeorusingextremelylongrunsofthepipe.

• Forrooftopventing, araincaporotherformofterminationthatpreventsrainwater from

enteringintothewaterheatermustbeinstalled.

• Donotcommonventorconnectanyventfromotherappliances

tothewaterheatervent.



Generalrulesforventterminations:

• 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.

• Locate the vent terminator so that

 it cannot be blocked by any de bris, at any time. Most

codesrequir e 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condi tionandapplicablecodes.

• A propersidewall terminatorisrecommendedwhen

thewa ter heaterisventedthrough  a

sidewall.

• Regarding the clearances fromtheexhaustterm inatortotheairinlet or opening, refer to

thenextfewpages.

CAUTION

DANGER

Installation

13│Page

‐Exhaustventing‐

(FortheT‐KJr2‐IN,T‐K4‐IN,&T‐D2‐INmodels)



ThisisaCategoryIII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350°F.Forbestresults,a

ventsystem

shouldbeasshortandstraightaspossible.

• ThiswaterheaterisaCategoryIIIapplianceandmustbeventedaccordinglywithany4”vent 

approvedforusewithCategoryIIIorSpecialBHtypegasvent.

• Followtheventpipemanufacturer’sinstructionswheninstallingthe

ventpipe.

• 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approvedorSpecialBHventpipe).

• When

the horizontal vent run exceeds 5 ft., support the vent run at 3 ft. intervals with

overheadhangars.

• 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.



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.

‐VentingIllustrations‐

(FortheT‐KJr2‐IN,T‐K4‐IN,&T‐D2‐INmodels)



HorizontalInstallationDiagram

VerticalInstallationDiagram

SidewallVent

Terminator

Wall

BackflowPreventer*

VerticalCondensationDrain**

Fordetailsoftheoptionalitems,refertothe InstallationmanualforeachOptionalitem.

Roof

VerticalCondensation

Drain**

RoofFlashing

RainCap

BackflowPreventer*

Installation

14│Page



*BackflowPreventer(Recommendedforfreezingweatherconditions:36

F andbelow)

**VerticalCondensationDrainmustbeinstalledaccordancewithlocalcodes.

HorizontalInstallationDiagram

WithDirect‐VentConcentric

Termination

HorizontalInstallationDiagram

(Withdirect‐venting)

VerticalInstallationDiagram

(Withdirect‐venting)

Thewaterheater

Intakeportof

Direct‐Vent

ConversionKit



InstallationDiagramofDirect‐Vent

ConversionKitwithwaterheater

Wall

Direct‐vent

Concentric

Termination

PlateofDirect‐VentConversionKit



Seethepicturebelowfordetailedconnection

instructionstotheDirect‐VentConversionKit.

VerticalCondensationDrain**



Backflow

Preventer*

Wall

Sidewall

Vent

Terminator

RoofFlashing

Vertical

Condensation

Drain**

Backflow

Preventer*

RainCap

Roof

Firestop

Installation

15│Page



‐Venttermination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requirementsofthegassupplier.

Installation

16│Page

Pleasefollowalllocalandnationalcodesinregardstoproperterminationclea rances.

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.

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terminati on.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

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termina tion

directlyinfrontofan

openingintoabuilding.

2ft.

Exhaust

termination

Airsupplyinlet

3ft.

Directventtermination

1ft.

Inside

corner

2ft.

CAUTION

Installation

17│Page

Sizethegaspipeappropriatelytosupplythenecessaryvolumeofgasrequiredfor

thewaterheater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.

• Checkthatthetypeofgasmatchestheratingplatefirst.

• 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 will void all

warranty. Contact your local distributor to get the correct unit for your gas

type.The manufacturer is not liable for any property and/or personal

damageresultingfromgasconversions.



GASSUPPLYANDGASPIPESIZING

‐General‐



• Theminimumandmaximuminletgaspressuresare:

Gastype Inletgaspressure

NaturalGas Min.5.0”WC–Max.10.5”WC

Propane Min.8.0”WC–Max.14.0”WC

• Gas pressure above this specified range for the water heater and/or insufficient gas volume will

adversely affect  performance.These pressures are measured when the water heater is in full

operation.

• 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.

• Until testing of the main gas line  supply pressure is completed, ensure the gas line to the water

heaterisdisconnectedtoavoidanydamagetothewaterheater.



‐Gasconnections‐

1. Installamanualgasshut‐offvalvebetweenthewaterheaterandthegassupplyline.

2. When the gas connections are completed, it is necessary to perform a gas leak test (see below)

eitherbyapplyingsoapywatertoallgasfittingsandobservingfor bubblesor byusing

a gasleak

detectiondevice.

• Thewaterheater anditsindividualshutoff  valvemustbe disconnected fromthe gassupply

pipingsystemduringanypressuretestingofthatsystemattestpressures inexcessof1/2psi

(3.5kPa).

• Thewaterheatermustbeisolatedfromthegassupplypipingsystembyclosingitsindividual

manual shutoff valve during any pressure testing of the gas supply piping system at test

pressuresequaltoorlessthan1/2psi(3.5kPa).

3. Alwayspurgethegaslineofanydebrisand/orwater

beforeconnectingtothegasinlet.



WARNING

NOTICE

Installation

18│Page



‐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1,000BTU/CubicFt.:Thewaterheaterrequires140CubicFt./hrfortheT‐KJr2‐IN/OS,

190CubicFt./hrfortheT‐K4‐IN/OS,and199CubicFt./hrfortheT‐D2‐IN/OS.

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)SupplyPiping‐

MaximumCapacityofPropane(LP)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below.



BasedonEnergyContentof1,000BTU/CubicFt:



Divideeachappliance’sBTUrequirementby1,000BTUtoget

theappliancesCubicFt.requirement.



Take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1,000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.

10’Length

1”PipeSize

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

Water

Heater

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

Installation

19│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.



‐Measuringinletgaspressure‐



Thewaterheater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waterheatershowninthe

diagramtotheright.

3. Connectthemanometertothepressureport.

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water

heater.

5. Checktheinletgaspressure.Whenthewaterheater

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Propane.



Pressureport

Installation

20│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toreplace

anydamagedparts.

• Donot reversethehot outletandcold inletconnectionstothe waterheater.

Thiswillnotproperlyactivatethewaterheater.

WATERCONNECTIONS

Allpipes,pipefittings,valvesandothercomponents,includingsolderingmaterials,mustbesuitablefor

potablewatersystems.

1. 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waterheater.

2. In addition, a manual

 shut off valve is also

recommended on the hot  water outlet of the

unit. If the water heater is installed within, or

subjected to, a closed loop water system, a

thermalexpansiontankmustbeinstalled.

3. 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.

4. 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

optimumflow.

‐Pressurereliefvalve‐

Thewaterheater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.

• Thisunitdoesnotcomewithanapprovedpressurereliefvalve.

• Anapprovedpressurereliefvalvemustbeinstalled

onthehotwateroutlet.

• ThepressurereliefvalvemustconformtoANSIZ21.22orCAN1‐4.4andinstallationmustfollow

localcode.

• The discharg e capacity must be at least 140,000 BTU/h for the T‐KJr2‐IN/OS, 190,000 BTU/h for

theT‐K4‐IN/OS,and199,000BTU/h

fortheT‐D2‐IN/OS.

• Thepressurereliefvalveneedstoberatedforamaximumof150psi.

• The dischargepipingfor thepressurereliefvalve mustbedirected sothatthehot watercannot

splashonanyoneoronnearbyequipment.

• 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.

• Ifthepressurereliefvalve  installedonthewaterheaterdischargesperiodically,thismaybedue

toadefectivethermal

expansiontankordefectivepressurereliefvalve.

• Thepressurereliefvalvemustbemanuallyoperatedperiodicallytocheckforcorrectoperation.

• Novalvemustbepla cedbetweenthereliefvalveandthewaterheater.

Pressure

ReliefValve

Hot

outle



Cold

inle



Gas

inle

AsCloseas

Possible

CAUTION

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Takagi T?K4?OS, 510 Outdoor (T-D2-OS), T?D2?IN, T?K4?IN, T?KJr2?IN, T?KJr2?OS Installation Manual And Owner's Manual

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