American Water Heater 520 Owner's manual

Brand: American Water Heater

Model: 520

Category: Water heaters & boilers

Type: Owner's manual

This manual is also suitable for

T-H2-IN/OS



‐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.



520(T‐H2)and320(T‐H2S)

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



Ifyouhaveanyquestions,please

callorwriteto:

500TennesseeWaltzParkway

AshlandCity,TN37015

TollFree:1‐877‐737‐2840

ANSI Z21.10.3andCSA4.3

GasTanklessWaterHeater

DirectVentIndoormodels(520Indoor(T‐H2‐DV),

320Indoor(T‐H2S‐DV))

Outdoormodels(520Outdoor(T‐H2‐OS),

320Outdoor(T‐H2S‐OS))

Suitableforpotablewaterheatingandspace‐heating

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



Iftheinformationinthese

instructionsisnotfollowed

exactly,afireorexplosion

mayresultcausing

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

WARNING

520(T‐H2)models

only

Contents

2│Page

NOTE

 Checktheratingplatetoensurethisproductmatchesyour

specifications.



 In accordance with ANZI Z21.10.3, CO emission does not

exceed400PPMfornormalinput.



CONTENTS

SPECIFICATIONS

520 (T‐H2) and 320(T‐H2S)models

GasInput

520

(T‐H2)

models

Natural

Min:13,000Btu/h

Max:199,000Btu/h

Propane

320

(T‐H2S)

models

Natural

Min:13,000Btu/h

Max:180,000Btu/h

Propane

GasConnection ¾”NPT

WaterConnections ¾”NPT

CondensateDrainPort

Connection

½”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**



520Direct

VentIndoor

(T‐H2‐DV)

Natural:3.2”WC

Propane:5.5”WC

520Outdoor

(T‐H2‐OS)

Natural:2.7”WC

Propane:4.6”WC

320Direct

VentIndoor

(T‐H2S‐DV)

Natural:2.5”WC

Propane:4.3”WC

320Outdoor

(T‐H2S‐OS)

Natural:1.9”WC

Propane:3.6”WC

Weight

73lbs.

(DirectVentIndoormodels)

71lbs.(Outdoormodels)

Dimensions H25.6”xW18.5”xD12.4”

Ignition ElectricIgnition

Electric

Supply 120VAC/60Hz

Consumption

Operationofthe

DirectVent

Indoormodels

152W

(1.27A)

Operationofthe



Outdoormodels



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Installations………………

Installationforoutdoormodels……..

Installationfordirectventindoor

models……………………………………………

VentingInstructions……………………....

GasSupply/GasPipeSizing………...…

WaterConnections……………..……….…

PressureReliefValve………………………

Condensatedrain…………………………..

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

RemoteControllerConnection…….…

PumpControlConnections………..……

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……...…

LIMITEDWARRANTY…………………….……



2

3

4

5

6

7

8

9



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

anytime,specificationsordesignswithoutnoticeandwithout

incurringobligations.

InstallationManual

Owner’sGuide

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

**TheManifoldPressureisthefactorysettingandgenerally

shouldnotneedadjustment.

Introduction

3│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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 the

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

 Thisequipmentisanon‐demand,tanklesswaterheatersdesignedtoefficientlysupply

endlesshotwaterforyourneeds.

 Theprinciplebehindthewaterheaterissimple:



1. Ahotwatertapisturnedon.

2. Waterenterstheheater.

3. Thewaterflowsensordetectsthewaterflow.

4. Thecomputerautomaticallyignitestheburner.

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

6. Thecomputerwillmodulate the

gassupplyvalveandwaterflowtoproducetheright

amountofhotwateratthecorrecttemperature.

7. Whenthetapisturnedoff,theunitshutsdown.

 Thewaterheateris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(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.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.38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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.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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.



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 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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 th is 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, th e 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combustio nairflow.



 The water heater is  high efficiency products that create condensation. A

condensation drain tube must be installed  with these models to discharge

condensateintoadrainoutlet.Formoreinformation,refertop.20.

 The manufacturer does not recommend installing the Direct Vent Indoor

modelsin an atticduetosafetyissues.IfyouinstallyourDirectVentIndoor

modelsinanattic:



 Make sure your unit will have enough combustion air and proper

ventilation.



 Keeptheareaaround you’rethewaterheater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in stallation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pre s sure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in stalling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productregistrationcardandthePVC

adaptorareincludedwiththeunit(theadapto rcomeswiththeDirectVentIndoormodelsonly.

Fordetailsonhowtoconnecttheadaptor,refertoP.14.

1.Manual



2.Communicationcable

520(T‐H2)modelsonly

3.ProductRegistrationCard



4.PVCadaptor

DirectVentIndoormodelsonly



Qty:1

:1

Qty:1

Installation

7│Page



OPTIONALITEMS

1.TemperatureRemoteController:9007603005(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 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.Pipecover:9007606005(TH‐PC02)

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.



3.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ventingbrochurefordetails).

Installthesevent terminationsinaccordancewiththeirinstallation

instructionsandanyapplicablelocalcodes.

4.Neutralizerkit:9007607005(TH‐NT01)



TheNeutralizerassemblyneutralizesthecondensate(acidic

water)thatformsinthesecondaryheatexchangerofthe

waterheater.

Itconnectstothecondensatedrainportofthewaterheaterby

usingconnectorsincludedwiththeneutralizerkit.Refertop.

21forthe

details.



Louver

Termination

9007608005

(TK‐KPWL4)

Hood

Termination

9007609005

(TK‐KPWH4)

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.(Outdoormodels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. (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.

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

our Technical

Services

Department

at1‐877‐

737‐2840

SwitchNo.6

OFF OFF ON



INSTALLATIONFOROUTDOORMODELS

1. InstalltheOutdoormodelonlyinareaswithmild,temperateclimates.

2. TheOutdoormodelshallbewall‐mountedormountedonastand.Locate theOutdoormodelin

anopen,unroofedareaandmaintainthefollowingminimumclearances:



DONOTadjustanydipswitchesontherightbank.

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.



INSTALLATIONFORDIRECTVENTINDOORMODELS



TheDirectVent Indoor modelsare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 Outdoor model, these components are not available since there’s no exhaust

ventingrequ ired.)



 TheDirectVentIndoormodel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



Direct Vent Ind oor model. Vertical

venting(rooftermination)isacceptable.

 The manufacturer recommends

running the exhaust vent and the

intakepipeasparallelasp ossible.

 ThePVCadaptorisusedtomake the

connection between the Direct Vent

Indoor model vent collar  and PVC

ventpipeeasierand

formaintenance

purposes.



VENTINGINSTRUCTIONS

‐General‐

TheDirectVentIndoormodels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useofventingmaterialsapprovedforCategoryIII/IVappliance sisrecommendedwheneverpossible.

However,theDirectVentIndoormodelsmayalsobeventedwithplasticpipematerialssuchasPVC.For

details,pleasereferto theExhaustVent(PVC Vent)sectiononp.11.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clearance s.

Installation

11│Page

Excludeselbowtermination,raincaps,orthe3”PVCConcentricTermination

FordetailsontheventconnectiontotheDirectVentIndoormodels

re

er toP.14

*Foreachelbowadded,deduct5ft.frommax.ventlength.



‐Exhaustvent(PVCandABSvent)‐



TheDirectVentIndoormodelscanbeconnectedwithPVCorABSventing(temperatureratedupto

149°F).However,themanufacturerrecommendsPVC(orABS)ventingcertifiedtoULCS636standards.

Item Material UnitedStates Canada

Exhaustpipeand

Fittings

Schedule40PVC ANSI/ASTMD1785

ULCS636Certified

MaterialsOnly

PVC‐DWV ANSI/ASTMD2665

Schedule40CPVC ANSI/ASTMF441

Schedule40ABS‐DWV ANSI/ASTMD2661

PipeCement/Primer

PVC ANSI/ASTMD2564

CPVC ANSI/ASTMF493

ABS ANSI/ASTMD2235

NOTE:DoNOTUseCellularFoamCorePipe

 Themaximum lengthofexhaustventpipingmustnotexceed50ft.for4”ventingand25ft.for

3”venting(deducting5ft.foreachelbowusedintheventingsystem).Donotusemorethan5

elbowsfor4”ventingand2elbowsfor3”venting.

 When

thehorizon t alventrunexceeds5ft.,supporttheventrunat3ft.intervalswithoverhead

hangers.



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

3” 2 25ft.

4” 5 50ft.



No.ofElbows

Max.VerticalorHorizontalLength

3”venting 4”venting

0 25ft. 50ft.

1 20ft. 45ft.

2 15ft. 40ft.

5 N/A 25ft.



ThisisaCategoryIVapplianceandmustbeventedaccordingly.Theventsystemmustbesealedairtight.

AllseamsandjointswithoutgasketsmustbesealedwithhighheatresistantsiliconesealantorULlisted

aluminumadhesivetapehavingaminimumtemperatureratingof160°F.Forbestresults,a

vent system

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

 TheDirectVent IndoormodelsareaCategoryIVapplianceandmustbeventedaccordinglywith

any4”ventapproved forusewithCategoryIII/IVorSpecialBHtypegasvent.

 The manufacturer recommends the “T‐Vent”line

manufactured by TAKAGI (Refer to Takagi’s

“T‐Vent”brochurefordetails).However,thefollowingarealsoULlistedmanufacturers:ProTech

SystemsInc.(FasNSeal),Flex‐LInc.,Z‐FlexInc.(Z‐VentIII),Metal‐FabInc.,andHeat‐FabInc.(Saf‐

TVent).

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

theventpipe.

‐Exhaustvent(Stainlesssteelvent)‐

Installation

12│Page



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

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

warranty.



 Do not common vent thisappliance with any ot hervented appliance(Donot terminate vent

intoachimney.Iftheventmustgothroughthechimney,theventmustrunallthewaythrough

thechimneywithCategoryIII/IVapprovedorSpecialBHventpipe).

 The

maximum length of exhaust vent piping must not exceed 50 ft. (deducting 5 ft. for each

elbowusedintheventingsystem).Donotusemorethan5elbows.

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

hangars.



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

4” 5 50ft.



*Foreachelbowadded,deduct5ft.frommax.Ventlength.

No.ofElbows Max.VerticalorHorizontalLength

0 50ft.

1 45ft.

2 40ft.

5 25ft.



‐Venttermination‐



 Theventterminatorprovidesameansofin stalling ventpipethroughthebuildingwallandmustbe

located in accordance  with ANSI Z223.1/NFPA  54, or in Canada with CAN/CSA‐B149.1 and local

applicablecodes.

 Apropersidewalldirect‐ventterminatorisrecommendedwhenthewaterheaterisventedthrough

a

sidewall.



GeneralrulesforventingtheDirectVentIndoormodelsare:

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

2. TheventcollarofthewaterheatermustbefasteneddirectlytoanunobstructedventpipeorPVC

adaptor.

3. Donotweldtheventpipeto

thewaterheatercollar.

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

5. Theweightoftheventstackmustnotrestonthewaterheater.

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

inspectionoftheunit.

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

8. Avoidlo cating the  waterheaterventterminatornearanyair intake devices.Thesefanscanpick

up the exhaust flue products from the water heater and return them to the building. This

can

createahealthhazard.

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



10. Locate the vent terminator so that  it cannot  be blocked by any debris, at any time. Most codes

requirethatthet erminatorbeatleast12inchesabovegrade,buttheinstallermaydetermineifit

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

11. For

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

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

WARNING

Installation

13│Page

1. ConnectthePVCadaptor*directlyontheexhaustventcollarofthewaterheater.

2. Connecta4”PVCcoupler(or4x3”PVCreducer)tothePVCadaptor.

3. Fromthecoupler(orreducer),continueontherestoftheventrunwith4”PVCpipe(or3”PVC

pipe.)



(ForExhaust)



HorizontalInstallationDiagram

(Withelbowterminations)

HorizontalInstallationDiagram

(With3”PVCConcentricTermination)

Keepa1”cle arancebetweenwall

andtheintakesectionofthe

concentrictermination.Seethe

diagramtotheleft.

‐PVCVentingIllustrations‐

HowtoinstallPVCventingwiththeDirectVentIndoormodels

ConnectionbetweenexhaustventcollarandPVCpiping

Seethenextpageforinstructions.

Wall

ConnectionbetweenexhaustventcollarandPVCpiping

Seethenextpageforinstructions.

Wall

1” minimum

clearance

ConcentricTermination

Insertthebirdscreenincludedwith

thetermination

VerticalInstallationDiagram

Roo

RoofFlashing

Firestop

Installation

14│Page

1. Connecta4”PVCStraightpipedirectlyontheintakeventcollarofthewaterheater.

2. Connecta4x3”PVCreducertothe4”PVCStraightpipe.

3. Fromthereducer,continueontherestoftheventrunwith3”PVCpipe.

(ForIntake:4”only)

(ForIntake:

3”only)





 Regardingtheclearancesfromtheexhaustterminatorto

theairinletoropening,refertothenextfewpages.

 Followallventsystemmanufacturer’sinstructionsandall

localcodes.

 Do not common vent or connect any vent from other

appliancestotheDirectVentIndoormodelsvent.



Use 4” Category III/IV approved or Special BH, single or

doublewallstainlesssteelventpipe.

VerticalInstallationDiagram

HorizontalInstallationDiagram

*PVCadaptorisincludedwiththeDirectVentIndoormodels.

4”ventconnectionDiagram

3”ventconnectionDiagram

‐

tainlessstee

VentingIl

ustrations‐

1.Connecta4”PVCStraightpipedirectlyontheintakeventcollarofthewaterheater.

RoofFlashing

Roo

RainCap

Firestop

Wall

SidewallVent

Terminator

Exhaustventcollar

oftheDirectVent

Indoormodels

(Female)



PVCadaptor*

4”PVCcoupler

4”PVCStraightpipe

4”PVCStraight

pipe

Intakeventcollar



3”PVCStraightpipe

4x3”PVCreducer

PVCadaptor*

3”PVCStraight

pipe

4x3”PVCreducer

4”PVCStraight

pipe

Intakeventcollar

Exhaustventcollar

oftheDirectVent

Indoormodels

(Female)



Installation

15│Page



‐Ventclearances‐



Canada U.S.A

Directventand

otherthanDirect

Vent

Directvent OtherthanDirectVent

A

Clearanceabovegrade,veranda,porch,deck,

orbalcony.

1foot 1foot 1foot

B

Clearancetowindowordoorthatmaybe

opened.

3feet 1foot

4feetfrombeloworside

opening.1footfrom

aboveopening.

C Clearancetopermanentlyclosedwindow * * *

D

Verticalclearancetoventilatedsoffitlocated

abovetheventterminatorwithinahorizontal

distanceof2feet(61cm)fromthecenterline

oftheterminator.

* * *

E Clearancetounventilatedsoffit * * *

F Clearancetooutsidecorner * * *

G Clearancetoinsidecorner * * *

H

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

abovemeter/regulatorassembly

3feet * *

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

J

Clearancetonon‐mechanicalairsupplyinlet

tobuildingorthecombustionairinlettoany

otherapplication.

3feet 1foot

4feetfrombeloworside

opening.1footfrom

aboveopening.

K Clearancetomechanicalairsupplyinlet. 6feet 3feet 3feet

L

Clearanceabovepavedsidewalkorpaved

drivewaylocatedonpublicproperty.

7feet * 7feet

M

Clearanceunderveranda,porchdeck,or

balcony.

1foot * *

*ForclearancesnotspecifiedinANSIZ223.1/NFPA54orCAN/CSA‐B149.1,pleaseuseclearancesinaccordancewith

localinstallationcodesandtherequirementofthegassupplier.

Installation

16│Page

‐Additionalclearances‐

Pleasefollowalllocalandnationalcodesinregardstoproperterminationclearances.Intheabsenceof

suchcodes,thefollowingclearancescanbeusedasguidelines.Localcodessupersedetheseguidelines.

Forsidewallterminations



Exhausttermination

1ft.

2ft.

Inside

corner

Formultiplesidewallexhaust

terminations(e.g.multi‐unit

systems),anexhausttermination

mustbeatleast1ft.awayfrom

anotherexhausttermination.An

exhaustterminationmustalsobe

atleast2ft.awayfromaninside

corner(iftheadjacentwallisless

than2ft.oflength,theminimum



requireddistanceawayfromthe

insidecornerwillbeequaltothe

lengthofthatadjacentwall).

Fordirect‐ventsidewall

terminationsthatusetwo

separatepenetrationsforthe

intakeandexhaust,distance

theintakeandexhaust

terminationsatleast3ft.away

fromeachother,nomatterthe

orientation.

Formultiple‐unit,direct‐ventsidewall

terminationsthatcombinetheintake

andexhaustintoasinglepenetration,

spaceeachdirect‐ventterminationat

least1ft.awayfromeachother,no

mattertheorientation.Adirect‐vent

terminationmustalsobeatleast2ft.

awayfromaninsidecorner(if

the

adjacentwallislessthan2ft.of

length,theminimumrequired

distanceawayfromtheinsidecorner

willbeequaltothelengthofthat

adjacentwall).

Formultiple‐unitrooftopterminations(whetherforstandardindooror

direct‐ventinstallations)spaceallexhaustandintaketerminationsin

accordance

withlocalcodes.Anexhaustterminationmustbespacedfrom

awallorsurfaceinaccordance withlocalcodes aswell.Intheabsenceof

suchacode,anexhaustterminationmustbeahorizontaldistanceofat

least2ft.awayfromawallorsurface.

A:inaccordancewith

localcodes

Forrooftopterminations



Airintake

Exhaust termination

A

A

2ft.

Airintake

Exhaust

termination

Exhaustand/ordirect‐vent

sidewallterminationsshould

beatleast2ft.awayfroman

oppositesurface/wall.Do

notplacethetermination

directlyinfrontofan

openingintoabuilding.

2ft.

Exhaust

termination

Airsupplyinlet

3ft.

Directventtermination

1ft.

Inside

corner

2ft.

Installation

17│Page



1. Turnoffallelectricpowertothewaterheaterifserviceistobeperformed.

2. Turnthemanualgasvalvelocatedontheoutsideoftheunitclockwisetotheoffposition.

 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 th is  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.

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.



GASSUPPLYANDGASPIPESIZING

 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 nece ssary 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 mu st  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

TOTURNOFFGASTOAPPLIANCE

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199CubicFt./hrforthe520(T‐H2)

models,and180CubicFt./hrforthe320(T‐H2S)models.

Unit:CubicFeetperHour

PipeSize Length

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

¾” 363 249 200 171 152 138 127 118 111 104 93 84 72

1” 684 470 377 323 286 259 239 222 208 197 174 158 135

1¼” 1,404 965 775 663 588 532 490 456 428 404 358 324 278

1½” 2,103 1,445 1,161 993 880 798 734 683 641 605 536 486 416

2” 4,050 2,784 2,235 1,913 1,696 1,536 1,413 1,315 1,234 1,165 1,033 936 801

‐Propane(LP)GasSupplyPiping‐

MaximumCapacityofPropane(LP)GasBasedon11”WCsupplypressureata0.5”WCpressuredrop

Unit:kBTUperHour

PipeSize

Length

Diameter

10’ 20’ 30’ 40’ 50’ 60’ 70’ 80’ 90’ 100’ 125’ 150’ 200’

¾” 567 393 315 267 237 217 196 185 173 162 146 132 112

1” 1,071 732 590 504 448 409 378 346 322 307 275 252 213

1¼” 2,205 1,496 1,212 1,039 913 834 771 724 677 630 567 511 440

1½” 3,307 2,299 1,858 1,559 1,417 1,275 1,181 1,086 1,023 976 866 787 675

2” 6,221 4,331 3,465 2,992 2,646 2,394 2,205 2,047 1,921 1,811 1,606 1,496 1,260



Formoreinformation,pleaseseethenextpage.



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.

Range

65,000BTU

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

5’Length

1‐1/4”PipeSize

10’Length

3/4”PipeSize

Dryer

35,000BTU

15’Length

1”PipeSize

5’Length

1‐1/4”PipeSize

GasMeter

199,000BTU

or

180,000BTU

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tothe

off

osition.

 Do not use this water heater if any part has been submersed under water.

Immediatelycallalicensedprofessionaltoinspectthewaterhe ater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.



‐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val ve.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.



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 with in, 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 comp lete, 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.

CAUTION

Pressure

ReliefValve

Hot

outlet

Cold

inlet

Gas

AsCloseas

Possible

Installation

20│Page



‐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 discharge cap acity must be at least 199,000 BTU/h for th e 520 (T‐H2) models, and 180,000

BTU/hforthe320(T‐H2S)models.

 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placedbetweenthereliefvalveandthewaterheater.



CONDENSATEDRAIN

 Thewaterheaterdoesnotincludeabuilt‐incondensateneutralizercartridgeforreducingthepH

levelofcondensatewater.Iflocalcodesdictatethatcondensatemustbeneutralizedpriorto

drainage,acondensateneutralizermustbeinstalled.AnaccessoryNeutralizerassemblyissold

separately.

 Intheabsenceof

applicablelocalcodesandregulations,themanufacturerrecommendsthat

condensatebedisposedofintoastandarddrain.Connectadraintubefromthecondensatedrain

port(shownbelow)locatedonthebottomofthewaterheatertoastandarddrain.



 Follow all code requirements

of the local authority on

condensate neutralizers and

whether or not they are

requiredfortheinstallation.



Condensatedrainport

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American Water Heater 520 Owner's manual

Brand: American Water Heater

Model: 520

Category: Water heaters & boilers

Type: Owner's manual

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T-H2-IN/OS

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American Water Heater 520 Owner's manual

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American Water Heater 520 Owner's manual

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