A.O. Smith ATI-310U-N Technical Documents

Brand: A.O. Smith

Model: ATI-310U-N

Category: Water heaters & boilers

Type: Technical Documents

Gas Tankless Water Heater

Suitable for potable water heating and space-heating*

* Please refer to local codes for space-heating compliance.

FEATURING

 • ENDLESSHOTWATER

 • ON-DEMANDUSAGE

 • COMPACT,SPACESAVING

 • ENERGYCONSERVATION

 • COMPUTERIZEDSAFETY

 • NOPILOTLIGHT

 • Satisfiesthe2012SCAQMDRule

1146.2forUltra-LowNOx

Emissions

 • EASY-LINKSYSTEMAND

MULTI-UNITSYSTEM

(510U (T-D2U) models only)

Models

510U(T-D2U)

modelsonly

Ifyouhaveanyquestions,please

callorwriteto:

500TennesseeWaltzParkway

AshlandCity,TN37015

TollFree:1-877-737-2840

WARNING

- 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.

On-Demand Water Heater

Installation Manual and Owner’s Guide

ANSIZ21.10.3andCSA4.3

If the information in these

instructions is not followed

exactly,afireorexplosionmay

resultcausingpropertydamage,

personalinjuryordeath.

• 110U Outdoor (T-KJr2U-OS)

• 310U Outdoor (T-K4U-OS)

• 510U Outdoor (T-D2U-OS)

• 110U Indoor (T-KJr2U-IN)

• 310U Indoor (T-K4U-IN)

• 510U Indoor (T-D2U-IN)

2 Page

CONTENTS

Installation Manual

SPECIFICATIONS.......................................................................................................................... 4

　INTRODUCTION.......................................................................................................................... 5

　SAFETYGUIDELINES.................................................................................................................... 6

　INSTALLATION............................................................................................................................. 7

　　General.....................................................................................................................................7

　　Clearances................................................................................................................................9

　　IncludedAccessories...............................................................................................................9

　　OptionalItems........................................................................................................................9

　　WarningforInstallations..........................................................................................................9

　　High-altitudeInstallations......................................................................................................12

　　VentingInstructions...............................................................................................................13

　　Gassupplyandgaspipesizing...............................................................................................18

　　WaterConnections................................................................................................................20

　　ElectricalConnections............................................................................................................21

　　TemperatureRemoteController...........................................................................................22

　　Easy-linkSystem.....................................................................................................................25

　　Multi-UnitSystem..................................................................................................................29

　APPLICATIONS............................................................................................................................30

　INITIALOPERATION...................................................................................................................32

Owner's Guide

OPERATINGSAFETY.................................................................................................................. 34

　NORMALOPERATION............................................................................................................... 36

　　General..................................................................................................................................36

　　TemperatureSettings.............................................................................................................37

　　Flow.......................................................................................................................................40

　　Freezeprotectionsystem.......................................................................................................40

　　Maintenanceandservice.......................................................................................................41

　　UnitDrainingFilterCleaning..................................................................................................41

　TROUBLESHOOTING...................................................................................................................42

　　General...................................................................................................................................42

　　ErrorCodes...........................................................................................................................44

　COMPONENTSDIAGRAM...........................................................................................................47

　PARTSLIST.................................................................................................................................51

　OUTPUTTEMPERATURECHART................................................................................................54

　LIMITEDWARRANTY..................................................................................................................55

3 Page

Contents

Installaon Manual

Installation Manual

CONGRATULATIONS

Congratulationsandthankyouforchoosingourtanklesswaterheater.

Beforeuse,werecommendthatyoureadthroughthissafetymanual

carefully.Pleaserefertothebackofthemanualfordetailsaboutthe

warranty.Keepthismanualforfuturereference.

If you lose the manual, contact the manufacturer or your local

distributor. When you call, please tell us the product name and the

serial number of your unit written on the rating plate of the water

heater.

4 Page

Model

110U

Indoor

(T-KJr2U-IN)

110U

Outdoor

(T-KJr2U-OS)

310U

Indoor

(T-K4U-IN)

310U

Outdoor

(T-K4U-OS)

510U

Indoor

(T-D2U-IN)

510U

Outdoor

(T-D2U-OS)

Natural Gas Input

(OperatingRange)

BTU/h

Min.:15,000

Max.:140,000

Min.:15,000

Max.:190,000

Min.:15,000

Max.:199,000

Gas Connection 3/4"NPT

Water Connections 3/4"NPT

Water Pressure*

psi

(Mpa)

15-150(0.1-1)

Natural gas

Inlet Pressure

"W.C.

(kPa)

Min.5.0(1.24)

Max.10.5(2.61)

Manifold

Pressure**

Natural

Gas

"W.C.

(Pa)

1.8

(448)

1.5

(373)

3.0

(747)

2.9

(722)

3.3

(821)

2.9

(722)

Weight lbs.(kg) 37(16.9) 39(17.9)

Dimensions

inch

H20.5xW13.8xD8.5

H520xW351xD216

Ignition ElectricIgnition

Electric

Supply VAC/Hz 120/60

Consumption

Operation W/A 52.1/0.54 75.8/0.83 81.6/0.86

Standby W/A 5.4/0.08 5.5/0.08 6.5/0.09

Freeze-

Protection

W/A 131/1.1 131/1.1 132/1.1

SPECIFICATIONS

*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.

Specicaons

Installaon Manual

5 Page

INTRODUCTION

• 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110U Indoor (T-KJr2U-IN),310U Indoor(T-K4U-IN)and 510UIndoor(T-D2U-IN) models

are to be installed indoor (direct-vent convertible). The 110U Outdoor (T-KJr2U-OS), 310U

Outdoor(T-K4U-OS)and510UOutdoor(T-D2U-OS)modelsaretobeonlyinstalledoutdoor.

• Theprinciplebehindtanklesswaterheatersissimple:

 *Thisdiagramillustratestanklesswaterheaterdesignconceptsonlyanddoesnotaccurately

representthewaterheater’sphysicaldescription.

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initiates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tapisturnedoff,theunitshutsdown.

Burners

Introducon

Installaon Manual

Exhaustventcollar

Heatexchanger

Gasvalves

Fanmotor

Flowadjustmentvalve

Computerboard

Thermistor

ColdwaterinletHotwateroutlet

Gasinlet

Thermistor

Burners

Flowsensor

6 Page

SAFETY GUIDELINES

SAFETY DEFINITION

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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.8).

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

• Watertemperaturesover125°F(52°C)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.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 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.

WARNING

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

indeathorseriousinjury.

CAUTION

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

inminorormoderateinjury.

Safety Guidelines

Installaon Manual

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

deathorseriousinjury.

DANGER

7 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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.9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.14).

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110UIndoor(T-KJr2U-IN),310UIndoor(T-K4U-IN)and510UIndoor(T-D2U-IN)models:

•Theseunitsmaybeconvertedtoadirect-vent(sealedcombustion)appliancebyinstalling

adirect-ventconversionkitPartNo.9007667005(TK-TV10)whichwillbringinallrequired

combustibleairfromoutsidethebuilding.Wheninstallingthedirect-vent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in.(76mm)

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the110UOutdoor(T-KJr2U-OS),310UOutdoor(T-K4U-OS)and510UOutdoor(T-D2U-OS)models:

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

Installaon

Installaon Manual

8 Page

INCLUDED ACCESSORIES

OPTIONAL ITEMS

• 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 correct 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

PartNo.9007667005(TK-TV10).

• Placethe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.

WARNING

• 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 installed 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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.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

Installaon

Installaon Manual

9 Page

Top

Black

Boom

Side

Front

Model Top Bottom Front Back Sides

110UIndoor(T-KJr2U-IN)*

310UIndoor(T-K4U-IN)*

510UIndoor(T-D2U-IN)*

12in.

(305mm)

12in.

(305mm)

4in.**

(102mm)

0.5in.

(13mm)

2in.

(51mm)

110UOutdoor(T-KJr2U-OS)

310UOutdoor(T-K4U-OS)

510UOutdoor(T-D2U-OS)

36in.

(914mm)

12in.

(305mm)

24in.

(610mm)

0.5in.

(13mm)

2in.

(51mm)

Maintain all clearances around

thewaterheater.

CLEARANCES

Installaon

Installaon Manual

*Standardindoorinstallationsanddirect-ventindoorinstallationshavethesameclearances.

**24inchrecommendedformaintenance.

OPTIONAL ITEMS

Model

110U

Indoor

(T-KJr2U-IN)

110U

Outdoor

(T-KJr2U-OS)

310U

Indoor

(T-K4U-IN)

310U

Outdoor

(T-K4U-OS)

510U

Indoor

(T-D2U-IN)

510U

Outdoor

(T-D2U-OS)

BackflowPreventer

✓ ✓ ✓

Direct-Vent

ConversionKit

✓ ✓ ✓

Pipecovers

✓✓✓✓✓✓

Recessbox

✓ ✓ ✓

T-VentWallThimble

withTermination

✓ ✓ ✓

Direct-VentConcentric

Termination

✓ ✓ ✓

INCLUDED ACCESSORIES

Installation Manual

and Owner’s Guide

Temperature

Remote Controller Kit*

Communication Cable

510U (T-D2U) models only

Qty:1

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

Qty:1

*Refertothep.22.

10 Page

Installaon

Installaon Manual

1. Backflow Preventer: 9007678005 (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.

2. Direct-Vent Conversion Kit: 9007667005

(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.

3. Pipe covers: 9007670005 (TK-PC01)

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.

5. T-Vent Wall Thimble with Termination: 9007608005 (TK-KPWL4) and 9007609005 (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 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two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.

Louver Termination

9007608005

(TK-KPWL4)

Hood Termination

9007609005

(TK-KPWH4

)

6. Direct-Vent Concentric Termination: 900768005 (TK-KPCT43)

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

direct-ventmodelsthatrequirea3in.(76mm)intakeanda4in.(102

mm) 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.

Part# Convering wall thicknesss

9007680005(TK-KPCT43-1) 3.9–7.1in.(99-180mm)

9007772005(TK-KPCT43-2) 6.9–10.1in.(175-257mm)

9007773005(TK-KPCT43-3) 9.8–13.0in.(249-330mm)

4. Recess box: 9007674005 (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.

11 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ft.(914mm)fromitstop

oreaves.Theareaunderanoverhangmustbe

opentothreesides.(Outdoormodelsonly)

Donotinstallthewaterheaterventterminator

within1ft.(305mm)intheUSAofanyairintake

orbuildingopening,andwithin3ft.(914mm)

inCanadaofanyairintakeorbuildingopening.

(Outdoormodels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.

ProhibitedProhibited

3ft.

(914mm)

1ft.(305mm)USA

3ft.(914mm)Canada

1ft.(305mm)USA

3ft.(914mm)Canada

1ft.(305mm)USA

3ft.(914mm)Canada

12 Page

HIGH-ALTITUDE INSTALLATIONS

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

dependingonthealtitude.

DIPswitches

110U (T-KJr2U) and 310U (T-K4U) models

Computer board

WARNING

DO NOT adjust any DIPswitches on the upper bank for the 510U (T-D2U)

models.

Installaon

Installaon Manual

NOTE: ThedarksquaresindicatethedirectiontheDIPswitchesshouldbesetto.

DIPswitches(Lowerbank)

510U (T-D2U) models

Computer board

Indoor models

0 (DEFAULT) Up to 2,500 ft Up to 5,000 ft Up to 7,500 ft Over 7,500 ft

110U(T-KJr2U)and

310(T-K4U)models

No.3:OFF

No.4:OFF

No.5:OFF

No.3:OFF

No.4:ON

No.5:OFF

No.3:OFF

No.4:OFF

No.5:ON

No.3:OFF

No.4:ON

No.5:ON

Consultour

Technical

Services

at1-888-

479-8324

510U(T-D2U)models

(Lower bank of

DIPswitches)

No.2:OFF

No.3:OFF

No.4:OFF

No.2:OFF

No.3:ON

No.4:OFF

No.2:OFF

No.3:OFF

No.4:ON

No.2:OFF

No.3:ON

No.4:ON

O F F

O N

1 2 3 4 56 7 8 9 10

O F F

O N

1 2 3 4 56 7 8 9 10

O F F

O N

1 2 3 4 56 7 8 9 10

O F F

O N

1 2 3 4 56 7 8 9 10

O F F

O N

1 2 3 4 56

O F F

O N

1 2 3 4 56

O F F

O N

1 2 3 4 56

O F F

O N

1 2 3 4 56

Altitude

DIPswitches

Outdoor models

0 (DEFAULT) Up to 2,000 ft Up to 4,000 ft Up to 6,000 ft Over 6,000 ft

110U(T-KJr2U)and

310(T-K4U)models

No.3:OFF

No.4:OFF

No.5:OFF

No.3:OFF

No.4:ON

No.5:OFF

No.3:OFF

No.4:OFF

No.5:ON

No.3:ON

No.4:OFF

No.5:ON

Consultour

Technical

Services

at1-888-

479-8324

510U(T-D2U)models

(Lower bank of

DIPswitches)

No.2:OFF

No.3:OFF

No.4:OFF

No.2:OFF

No.3:ON

No.4:OFF

No.2:OFF

No.3:OFF

No.4:ON

No.2:ON

No.3:OFF

No.4:ON

O F F

O N

1 2 3 4 56 7 8 9 10

O F F

O N

1 2 3 4 56 7 8 9 10

O F F

O N

1 2 3 4 56 7 8 9 10

O F F

O N

1 2 3 4 56 7 8 9 10

O F F

O N

1 2 3 4 56

O F F

O N

1 2 3 4 56

O F F

O N

1 2 3 4 56

O F F

O N

1 2 3 4 56

Altitude

DIPswitches

13 Page

VENTING INSTRUCTIONS

For indoor models

-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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collar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debris,atanytime.Mostcodes

requirethattheterminatormustbeatleast12in.(305mm)abovegrade,buttheinstallermay

determineifitshouldbehigherdependingonthejobsiteconditionandapplicablecodes.

• A proper sidewall terminator is recommended when the water heater is vented through a

sidewall.

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

nextfewpages.

• 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.

DANGER

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.

CAUTION

Installaon

Installaon Manual

14 Page

-Vent length and No. of Elbow-

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(177°C).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in.(102

mm)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.(1.5m),supporttheventrunat3ft.(0.9m)intervals

withoverheadhangers.

• The maximum length ofexhaustventpiping mustnot exceed50 ft. (15.2 m)(deducting 5ft.

(1.5m)foreachelbowusedintheventingsystem).Donotusemorethan5elbows.

-DIPswitch settings for Direct Vent models-

Diameter Max. No. of Elbow Max. Vertical and Horizontal (Total) Vent Length

4in.(102mm) 5 50ft.(15.2m)

*For each elbow added, deduct 1.5m (5 ft.) from max. vent length.

Installaon

Installaon Manual

No. of Elbows Max. Vertical or Horizontal Vent Length

0 50ft.(15.2m)

1 45ft.(13.7m)

2 40ft.(12.2m)

5 25ft.(7.6m)

Excludeselbowtermination,raincaps,orthe4in.(102mm)PVCConcentricTermination

SetDIPswitchesshowninthetablebelowdependingontheventlength.

110U Direct vent (T-KJr2U-IN)

310 Direct vent (T-K4U-IN)

510U Direct vent (T-D2U-IN)

(Upper bank of DIPswitches)

Vent length

No.6:ON

No.7:OFF

No.3:ON

No.4:OFF

0 to 30 ft

No.6:ON

No.7:ON

No.3:ON

No.4:ON

31 to 50 ft

O F F

O N

1 2 3 4 56 7 8

O F F

O N

1 2 3 4 56 7 8

O F F

O N

1 2 3 4 56 7 8 9 1 0

O F F

O N

1 2 3 4 56 7 8 9 1 0

15 Page

-Venng Illustraons-

For the 110U Indoor (T-KJr2U-IN), 310U Indoor (T-K4U-IN) and 510U Indoor (T-D2U-IN) models

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

Horizontal Installaon Diagram With

Direct-Vent Concentric Terminaon

Wall

Direct-vent

Concentric

Terminaon

Installaon Diagram of Direct-Vent

Conversion Kit with water heater

Thewaterheater

IntakeportofDirect-Vent

ConversionKit

(FordetailsseeP.10)

*BackflowPreventer(Recommendedforfreezingweatherconditions:36°F(2°C)andbelow).

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

Installaon

Installaon Manual

PlateofDirect-VentConversionKit

Horizontal Installaon Diagram

Wall

SidewallVent

Terminator

VerticalCondensationDrain**

Backflow

Preventer*

Vercal Installaon Diagram

Backflow

Preventer*

RainCap

Roof

VerticalCondensationDrain**

RoofFlashing

Vercal Installaon Diagram

(With direct-venng)

Horizontal Installaon Diagram

(With direct-venng)

Roof

SidewallVent

Terminator

VercalCondensaonDrain**

Backow

Preventer*

Seethepicturebelowfordetailedconnecon

instruconstoDirect-VentConversionKit.

Backow

Preventer*

Firestop

VercalCondensaon

Drain**

Wall

Roof

Flashing

RainCap

16 Page

-Vent terminaon clearances-

Canada U.S.A

Directventandother

thanDirectVent

Direct

vent

Otherthan

DirectVent

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 * * *

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 * * *

Clearancetoeachsideofcenterlineextended

abovemeter/regulatorassembly

3feet * *

I Clearancetoserviceregulatorventoutlet. 3feet * *

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

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.

Installaon

Installaon Manual

INSIDECORNERDETAIL

Gasmeter/regulator

Ventterminal

Airsupplyinlet

Areawhereisnotpermitted

OPERABLE

FIXED

CLOSED

OPERABLE

FIXED

CLOSED

17 Page

-For sidewall terminaons-

For multiple sidewall exhaust terminations (e.g. multi-

unit systems),an exhaust terminationmust be at least1

ft. (305mm) away from another exhaust termination. An

exhaust termination mustalso be atleast2 ft.(610 mm)

awayfromaninsidecorner(iftheadjacentwallislessthan

2ft.(610mm) of length,theminimumrequired distance

awayfromtheinsidecornerwillbeequaltothelengthof

thatadjacentwall).

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.(305mm)

awayfromeachother,nomattertheorientation.Adirect-

ventterminationmustalsobeatleast2ft.(610mm)away

fromaninsidecorner(iftheadjacentwallislessthan2ft.

(610mm)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.(915mm)away

from each other, no

mattertheorientation.

For multiple-unit rooftop terminations (whether for standard 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.(610mm)awayfromawallorsurface.

Exhaust and/or

direct-vent sidewall

terminations should

be at least 2 ft. (610

mm) away from an

opposite surface/

wall.Donotplacethe

termination directly

infrontofanopening

intoabuilding

　2ft.

(610mm)

Exhaust

termination

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.

CAUTION

Installaon

Exhaust

termination

Inside

corner

1ft.

(305mm)

2ft.

(610mm)

1ft.

(305mm)

Combined

intakeand

exhaust

termination

Inside

corner

1ft.

(305mm)

2ft.

(610mm)

1ft.

(305mm)

Installaon Manual

-For rooop terminaons-

A:Inaccordancewithlocalcodes

Airintake

Exhaustterminaon

Air intake

2.

(610mm)

Exhaust

terminaon

3ft.

(915

mm)

Airsupplyinlet

3ft.

(915mm)

3ft.

(915mm)

Exhaust

termination

18 Page

GAS SUPPLY AND GAS PIPE SIZING

-General-

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

• 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 connecons-

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(3.5kPa).

3. Alwayspurgethegaslineofanydebrisand/orwaterbeforeconnectingtothegasinlet.

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.

NOTICE

Gas type Inlet gas pressure

NaturalGas Min.5.0”W.C . (1.24kPa)–Max.10.5”W.C . (2.61kPa)

• 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 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.

CAUTION

Installaon

Installaon Manual

19 Page

-Natural Gas Supply Piping-

MaximumdeliveryCapacityofCubicFeetofGasperHourofIPSPipecarryingNaturalGaswith0.60SpecificGravity

BasedonPressureDropof0.5"W.C.

Based on Energy Content of 1,000 BTU/Cubic ft.: The water heater requires 140 Cubic ft./hr for the 110U (T-KJr2U)

models, 190 Cubic ft./hr for the 310U (T-K4U) models, and 199 Cubic ft./hr for the 510U (T-D2U) models.

Pipe Size Length

Diameter 10' 20' 30' 40' 50' 60' 70' 80' 90' 100' 125' 150' 200'

3/4"

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

1/4"

1,404 965 775 663 588 532 490 456 428 404 358 324 278

1/2"

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

Unit: Cubic Feet per Hour

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

Divideeachappliance'sBTUrequirementby1,000BTU/h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50ft.,

SectionAtoBneedstobe1"inordertosupply220cubicft.

Installaon

Installaon Manual

Water

Heater

199,000BTU/h

Dryer

35,000BTU/h

Gas Meter

Furnace

120,000BTU/h

Range

65,000BTU/h

10'Length

1/2"PipeSize

15'Length

1/2"PipeSize

15'Length

1"PipeSize

10'Length

3/4"PipeSize

10'Length

1"PipeSize

5'Length

1-1/4"PipeSize

10'Length

3/4" Pipe Size

5'Length

1-1/4"PipeSize

Gas Sizing Example

(Natural Gas)

20 Page

-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.

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.

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tothe

offposition.

• 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.

CAUTION

Installaon

Installaon Manual

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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andminimumburn,themanometershould

readfrom5.0”to10.5”W.C.(1.24to2.61kPa)forNatural

gas.

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.(RefertoP.36)

Pressureport

Cold

inlet

Hot

outlet

Gas

inlet

As Close as

Possible

Pressure Relief Valve

Page is loading ...

A.O. Smith ATI-310U-N Technical Documents

Brand: A.O. Smith

Model: ATI-310U-N

Category: Water heaters & boilers

Type: Technical Documents

Download PDF

report

A.O. Smith ATI-310U-N Technical Documents

A.O. Smith ATI-310U-N Technical Documents

Related papers

Other documents