A.O. Smith 197835-001 User manual

1
Instruction Manual
PRINTED IN THE U.S.A 1208 197835-001
KEEP THIS MANUAL IN THE POCKET ON HEATER FOR FUTURE REFERENCE
WHENEVER MAINTENANCE ADJUSTMENT OR SERVICE IS REQUIRED.
POWER VENT/POWER DIRECT VENT GAS MODELS
WITH HOT SURFACE IGNITION
ALL TECHNICAL AND WARRANTY QUESTIONS: SHOULD BE DIRECTED TO THE LOCAL DEALER FROM WHOM THE WATER HEATER WAS
PURCHASED. IF YOU ARE UNSUCCESSFUL, CALL THE TECHNICAL SUPPORT PHONE NUMBER SHOWN ON THE WATER HEATER LABELING.
RESIDENTIAL GAS WATER HEATERS
• For Your Safety •
AN ODORANT IS ADDED TO THE GAS USED
BY THIS WATER HEATER.
Ashland City, TN 37015
www.hotwater.com

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SAFE INSTALLATION, USE AND SERVICE
Your safety and the safety of others is extremely important in the installation, use and servicing of this water heater.
Many safety-related messages and instructions have been provided in this manual and on your own water heater to warn you and
others of a potential injury hazard. Read and obey all safety messages and instructions throughout this manual. It is very important
that the meaning of each safety message is understood by you and others who install, use or service this water heater.
All safety messages will generally tell you about the type of hazard, what can happen if you do not follow the safety message and
how to avoid the risk of injury.
The California Safe Drinking Water and Toxic Enforcement Act requires the Governor of California to publish a list of substances
known to the State of California to cause cancer, birth defects, or other reproductive harm, and requires businesses to warn of
potential exposure to such substances.
This product contains a chemical known to the State of California to cause cancer, birth defects, or other reproductive harm. This
appliance can cause low level exposure to some of the substances listed.
IMPORTANT DEFINITIONS
• Qualied Installer or Service Agency: Installation and service of this water heater requires ability equivalent to that
ofaQualiedAgency(asdenedbyANSIbelow)intheeldinvolved.Installationskillssuchasplumbing,airsupply,
venting,gassupply,electricalsupplyarerequiredinadditiontoelectricaltestingskillswhenperformingservice.
• ANSI Z223.1 2006 Sec. 3.3.83: “QualiedAgency”-“Anyindividual,rm,corporationorcompanythateitherinperson
orthrougharepresentativeisengagedinandisresponsiblefor(a)theinstallation,testingorreplacementofgaspiping
or(b)theconnection,installation,testing,repairorservicingofappliancesandequipment;thatisexperiencedinsuch
work;thatisfamiliarwithallprecautionsrequired;andthathascompliedwithalltherequirementsoftheauthority
havingjurisdiction.”.
• Gas Supplier: TheNaturalGasorPropane Utility or service who supplies gas for utilization by the gas burning
applianceswithinthisapplication.Thegassuppliertypicallyhasresponsibilityfortheinspectionandcodeapprovalof
gaspipinguptoandincludingtheNaturalGasmeterorPropanestoragetankofabuilding.

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GENERAL SAFETY

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GENERAL SAFETY

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Thank Youforpurchasingthiswaterheater.Properlyinstalledand
maintained,itshouldgiveyouyearsoftroublefreeservice.
Abbreviations Found In This Instruction Manual:
• CSA-CanadianStandardsAssociation
• ANSI-AmericanNationalStandardsInstitute
• NFPA-NationalFireProtectionAssociation
• ASME-AmericanSocietyofMechanicalEngineers
• GAMA-GasApplianceManufacturer’sAssociation
• UL-UnderwritersLaboratoriesInc.
This gas-red water heater is design certied by Underwriters
LaboratoriesInc.underAmericanNationalStandard/CSAStandard
forGasWaterHeatersANSIZ21.10.3•CSA4.3(currentedition).
PREPARING FOR THE INSTALLATION
1. Readthe“General Safety” section, page3 and 4 of this manual
rst and then the entire manual carefully. If you don’t follow the
safety rules, the water heater will not operate properly. It could
causeDEATH, SERIOUS BODILY INJURYAND/ORPROPERTY
DAMAGE.
Thismanualcontainsinstructionsfortheinstallation,operation,
andmaintenanceofthegas-redwaterheater.Italsocontains
warnings throughout the manual that you must read and be
awareof.Allwarnings and all instructions areessential to the
properoperationofthewaterheaterandyoursafety.Sincewe
cannotputeverythingontherstfewpages,READ THE ENTIRE
MANUAL BEFORE ATTEMPTING TO INSTALL OR OPERATE
THE WATER HEATER.
2.The installation must conform with these instructions and the
local code authority having jurisdiction. In the absence of local
codes,theinstallationmustcomplywiththecurrenteditionsofthe
NationalFuelGasCode,ANSIZ223.1/NFPA54andtheNational
ElectricalCode,NFPA70orCAN/CSA-B149.1,theNaturalGasand
PropaneInstallationCodeandCSAC22.1,theCanadianElectrical
Code.Alldocumentsareavailablefrom the CanadianStandards
Association, 8501 East Pleasant Valley Road, Cleveland, OH 44131.
NFPAdocumentsarealsoavailablefromtheNationalFireProtection
Association,1BatterymarchPark,Quincy,MA02269.
3. Thewater heater wheninstalled mustbegrounded inaccordance
with the local codes, or in the absence of local codes: the National
ElectricalCode(NFPA70)ortheCanadianElectricalCode(C22.1).
4.If after reading this manual you have any questions or do not
understandanyportionoftheinstructions,callthelocalgasutility
orthemanufacturerwhosenameappearsontheratingplate.
5.Carefully planthe placewhere youare goingto put thewater
heater.Correctcombustion,ventaction,andventpipeinstallation
are very important in preventing death from possible carbon
monoxidepoisoningandres,seeFigures1and2.
Examinethelocationtoensurethewaterheatercomplieswith
the“FactstoConsiderAboutLocation”sectioninthismanual.
6.For California installation this water heater must be braced,
anchored, or strapped to avoid falling or moving during an
earthquake.Seeinstructionsforcorrectinstallationprocedures.
InstructionsmaybeobtainedfromCaliforniaOfceoftheState
Architect,400PStreet,Sacramento,CA95814.
7. Massachusetts Code requires this water heater to be installed in
accordancewithMassachusetts248-CMR2.00:StatePlumbing
Codeand248-CMR5.00,Seepage8.
8.ComplieswithSCAQMDrule#1146anddistrictshavingequivalent
NOxrequirements.
INTRODUCTION
TABLE OF CONTENTS
SAFE INSTALLATION, USE AND SERVICE............................2
GENERAL SAFETY..................................................................3
TABLE OF CONTENTS............................................................5
INTRODUCTION......................................................................5
 PreparingfortheInstallation.............................................5
Get to Know Your Water Heater........................................6
INSTALLATION CONSIDERATIONS .......................................7
 RoughInDimensions........................................................7
 CommonwealthofMassachusetts....................................8
 WaterPiping-MixingValveUsage...................................9
Facts to Consider About Location...................................10
 InsulationBlankets..........................................................11
 CombustionAirandVentilation.......................................11
  AppliancesinUnconnedSpaces...........................11
  AppliancesinConnedSpaces ..............................11
INSTALLING THE WATER HEATER..................................... 13
 ChemicalVaporCorrosion ..............................................13
 WaterPiping ...................................................................13
 Temperature-PressureReliefValve ................................14
 GasPiping ......................................................................15
 SedimentTraps...............................................................16
 FillingtheWaterHeater ..................................................16
 Venting............................................................................16
 VentPipeTermination ............................................... 16-17
 PlanningtheVentSystem...............................................19
Condensate.....................................................................19
 InstallationofVentSystem..............................................20
 VentTerminalInstallation,Sidewall.................................20
 SequenceofInstallations,Figure18A ............................20
 DirectVenting..................................................................20
 DirectVentTerminalInstallation......................................20
Installation Sequence......................................................21
 VerticalVentTerminalInstallation ...................................21
 InstallationofVentSystem,Sidewall ..............................22
 InstallationofVerticalVentSystem.................................22
 VentPipePreparation.....................................................26
Controls and Switches ....................................................28
 PowerVentWiringSchematic.........................................29
LIGHTING & OPERATING LABEL.........................................30
TEMPERATURE REGULATION ............................................31
USING THE ELECTRONIC CONTROLLER ..........................32
FOR YOUR INFORMATION...................................................36
 StartUpConditions
  Smoke/Odor ............................................................36
  ThermalExpansion .................................................36
  StrangeSounds ......................................................36
 OperationalConditions ...................................................36
  SmellyWater ...........................................................36
  “Air”inHotWaterFaucets.......................................36
PERIODIC MAINTENANCE...................................................37
 VentingSystemInspection..............................................37
 BurnerOperationandInspection....................................37
 BurnerCleaning..............................................................37
 Housekeeping.................................................................37
 AnodeRodInspection.....................................................38
 Temperature-PressureReliefValveOperation ...............38
 Draining...........................................................................38
Service............................................................................39
LEAKAGE CHECKPOINTS....................................................39
TROUBLESHOOTING ...........................................................40
NOTES ............................................................................. 41-42
WARRANTY ...........................................................................43

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* CAUTION HARNESS HAS 120 VAC. IN OPERATION.
** See “Planning the Vent System,” “Installation of Vent System” and “Condensate” for more information.
FIGURE 1.
VACUUM RELIEF
VALVE
*INSTALL PER
LOCAL CODES
M Display Enclosure
** N Exhaust Elbow Assembly
** O Condensate Tubing
P Off/On Switch
Q Display Label
R Hot Water Outlet
*S Electrical Outlet (120VAC)
T Gas Supply
U Main Manual Gas Shutoff Valve
V Union
W Inlet Water Shutoff Valve
X Cold Water Inlet
GET TO KNOW YOUR WATER HEATER - GAS MODELS
A Control Assembly
B Blocked Inlet Switch
C Blocked Outlet Switch
D Fan Prover Switch
E Blower Assembly
F Burner Assembly
G Flame Sensor
H Hot Surface Igniter
I Junction Box
J Gas Control Valve Thermostat
K Display Board
L Top Plastic Enclosure
Y Inlet Dip Tube
Z T/P Relief Valve
AA Rating Plate
BB Labels
CC Drain Valve
** DD Vent Terminal
EE Metal Drain Pan
FF Anode
GG Insulation
HH Upper Temperature Probe
II Access Door
REPLACEMENT PARTS AND DELIMING PRODUCTS
Replacementpartsandrecommendeddelimermaybeorderedthrough
authorizedservicersordistributors.Whenorderingparts,providecomplete
modelandserial numbers(seeratingplate),quantity andnameofpart
desired.Standardhardwareitemsmaybepurchasedlocally.
Caution: Thisaccesspanelcovers
a 2” NPT plug that was required
during the manufacturing of this
waterheater.This2”NPTangeis
not a cleanout tting,removingthe
2”NPTplugandusingthisttingasa
cleanout could void your warranty.
ACCESS PANEL

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Rough-In-Dimensions
Model Units A B C D E F
100 Inches 68.50 49.25 22.00 15.75 3.00 8.00
cm 174 125.09 55.88 40.00 7.62 20.32
Top/Side Inlet and Outlet: 3/4” NPT
Gas Inlet: 1/2” NPT
Capacity, Gas and Electrical Characteristics
Model ApproximateCapacity Manifold Pressure Electrical Characteristics
U.S. Gals. Liters GasType “WC kPA Volts/Hz Amperes
100 50 189 Nat./LP 0” 0” 120/60 <5
All models - Maximum Supply Pressure: 14 inches W.C. (3.48kPa)
Minimum Supply Pressure for Natural Gas: 3.50” (.87kPa)
Minimum Supply Pressure for Propane Gas: 8.00” (1.99kPa)
Minimum pressure must be maintained under both load and no load (dynamic and static) conditions.
Recovery Capacities - U.S. Gallons/Hr. and Liters/Hr. at Temperature Rise Indicated
Model
Input RecoveryCapacities
Rating
(Btu/hr)
Rating
(kW)
Temp.
Rise
F 30 40 50 60 70 80 90 100 110 120 130 140
C 17 22 28 33 39 44 50 56 61 67 72 78
100 100,000 29.3 GPH 387 291 233 194 166 145 129 116 106 97 90 83
LPH 1465 1102 882 734 628 549 488 439 401 367 341 314
Recovery capacity based on 96% thermal efciency
INSTALLATION CONSIDERATIONS
ROUGH IN DIMENSIONS
FIGURE 1A.

8
Forallsidewallterminated,horizontallyventedpowervent,directvent,andpowerdirectventgasfueledwaterheaters
installedineverydwelling,buildingorstructureusedinwholeorinpartforresidentialpurposes,includingthoseowned
oroperatedbytheCommonwealthandwherethesidewallexhaustventterminationislessthanseven(7)feetabove
finishedgradeintheareaoftheventing,includingbutnotlimitedtodecksandporches,thefollowingrequirements
shall be satisfied:
INSTALLATION OF CARBON MONOXIDE DETECTORSAtthetimeofinstallationofthesidewallhorizontalventedgasfueled
equipment,theinstallingplumberorgasttershallobservethatahardwiredcarbonmonoxidedetectorwithanalarmandbatteryback-up
isinstalledontheoorlevelwherethegasequipmentistobeinstalled.Inaddition,theinstallingplumberorgasttershallobservethat
abatteryoperatedorhardwiredcarbonmonoxidedetectorwithanalarmisinstalledoneachadditionallevelofthedwelling,building
orstructureservedbythesidewallhorizontalventedgasfueledequipment.Itshallbetheresponsibilityofthepropertyownertosecure
theservicesofqualiedlicensedprofessionalsfortheinstallationofhardwiredcarbonmonoxidedetectors.
Intheeventthatthesidewallhorizontallyventedgasfueledequipmentisinstalledinacrawlspaceoranattic,thehard
wiredcarbonmonoxidedetectorwithalarmandbatteryback-upmaybeinstalledonthenextadjacentoorlevel.
Intheeventthattherequirementsofthissubdivisioncannotbemetatthetimeofcompletionofinstallation,theownershall
haveaperiodofthirty(30)daystocomplywiththeaboverequirementsprovidedthatduringsaidthirty(30)dayperiod,a
batteryoperatedcarbonmonoxidedetectorwithanalarmshallbeinstalled.
APPROVED CARBON MONOXIDE DETECTORSEachcarbonmonoxidedetectorasrequiredinaccordancewiththe
aboveprovisionsshallcomplywithNFPA720andbeANSI/UL2034listedandCSAcertied.
SIGNAGE Ametalorplasticidenticationplateshallbepermanentlymountedtotheexteriorofthebuildingataminimum
heightofeight(8)feetabovegradedirectlyinlinewiththeexhaustventterminalforthehorizontallyventedgasfueled
heatingapplianceorequipment.Thesignshallread,inprintsizenolessthanone-half(1/2)inchinsize,“GAS VENT
DIRECTLY BELOW. KEEP CLEAR OF ALL OBSTRUCTIONS.”
INSPECTION Thestateorlocalgasinspectorofthesidewallhorizontallyventedgasfueledequipmentshallnotapprovethe
installationunless,uponinspection,theinspectorobservescarbonmonoxidedetectorsandsignageinstalledinaccordance
withtheprovisionsof248CMR5.08(2)(a)1through4.
EXEMPTIONS:Thefollowingequipmentisexemptfrom248CMR5.08(2)(a)1through4:
1.TheequipmentlistedinChapter10entitled“EquipmentNotRequiredToBeVented”inthemostcurrenteditionofNFPA
 54asadoptedbytheBoard;and
2.ProductApprovedsidewallhorizontallyventedgasfueledequipmentinstalledinaroomorstructureseparatefromthe
 dwelling,building,orstructureusedinwholeorinpartforresidentialpurposes.
MANUFACTURER REQUIREMENTS - GAS EQUIPMENT VENTING SYSTEM PROVIDEDWhenthemanufacturerofProduct
Approvedsidewallhorizontallyventedgasequipmentprovidesaventingsystemdesignorventingsystemcomponentswiththe
equipment,theinstructionsprovidedbythemanufacturerforinstallationoftheequipmentandtheventingsystemshallinclude:
1.Detailedinstructionsfortheinstallationoftheventingsystemdesignortheventingsystemcomponents;and
2.Acompletepartslistfortheventingsystemdesignorventingsystem.
MANUFACTURER REQUIREMENTS - GAS EQUIPMENT VENTING SYSTEM NOT PROVIDEDWhenthemanufacturer
ofaProductApprovedsidewallhorizontallyventedgasfueledequipmentdoesnotprovidethepartsforventingtheflue
gases,butidentifies“specialventingsystems,”thefollowingrequirementsshallbesatisfiedbythemanufacturer:
1.Thereferenced“specialventingsystem”instructionsshallbeincludedwiththeapplianceorequipmentinstallationinstructions;and
2.The“specialventingsystems”shallbeProductApprovedbytheBoard,andtheinstructionsforthatsystemshallinclude
 apartslistanddetailedinstallationinstructions.
AcopyofallinstallationinstructionsforallProductApprovedsidewallhorizontallyventedgasfueledequipment,allventing
instructions,allpartslistsforventinginstructions,and/orallventingdesigninstructionsshallremainwiththeapplianceor
equipmentatthecompletionoftheinstallation.
INSTALLATION REQUIREMENTS FOR THE COMMONWEALTH OF MASSACHUSETTS

9
FIGURE 2.
WATER PIPING - MIXING VALVE USAGE
This appliance has been design certified as complying with
AmericanNationalStandard/CSAStandardforwaterheatersand
is considered suitable for:
Water (Potable) Heating and Space Heating:All models are
consideredsuitableforwater(potable)heatingandspaceheating.
HOTTER WATER CAN SCALD:
Waterheatersareintendedtoproducehotwater.Waterheated
to a temperature which will satisfy space heating, clothes
washing, dish washing, and other sanitizing needs can scald
andpermanentlyinjureyouuponcontact.Somepeoplearemore
likelytobepermanentlyinjuredbyhotwaterthanothers.These
includetheelderly,children,andthephysicallyordevelopmentally
disabled.Ifanyoneusinghotwaterfromthisheaterfitsintoone
ofthesegroupsorifthereisalocalcodeorstatelawrequiring
acertaintemperaturewateratthehotwatertap,thenyoumust
takespecialprecautions.Inadditiontousingthelowestpossible
temperaturesettingthatsatisfiesyourhotwaterneeds,ameans
suchas aMixing Valve,should be used at the hot water taps
usedbythesepeopleoratthewaterheater,seeFigure2.Mixing
valves are available at plumbing supply or hardware stores.
Consult a Qualified Installer or ServiceAgency. Follow mixing
valve manufacturer’s instructions for installation of the valves.
Beforechangingthefactorysettingonthethermostat,readthe
“TemperatureRegulation”sectioninthismanual.
* The side recirculation loop connections may not be used as the primary water inlet and outlet connections. For your convenience, plugs are installed
in these ttings at the factory. Remove these plugs if needed for your specic installation. Otherwise (as with all connections) check for leaks while
lling the tank with water and after completing the installation.

10
FACTS TO CONSIDER ABOUT THE LOCATION
Carefully choose an indoor location for the new water heater, because
theplacementisaveryimportantconsiderationforthesafetyofthe
occupantsinthebuildingandforthemosteconomicaluseofthe
appliance. This water heater is not for use in manufactured
(mobile) homes or outdoor installation.
Whetherreplacinganoldwaterheaterorputtingthewaterheaterin
anewlocation,thefollowingcriticalpointsmustbeobserved:
1. Selectalocationindoorsascloseaspracticaltotheventterminalor
locationtowhichthewaterheaterventpipingisgoingtobeconnected,
andascentralizedwiththewaterpipingsystemaspossible.
2.Selectedlocationmustprovideadequateclearancesforservicing
andproperoperationofthewaterheater.
Installationofthewaterheatermustbeaccomplishedinsuchamanner
thatifthetankoranyconnectionsshouldleak,theowwillnotcause
damagetothestructure.Forthisreason,itisnotadvisabletoinstall
thewaterheaterinanatticorupperoor.Whensuchlocationscannot
beavoided,asuitablemetaldrainpanshouldbeinstalledunderthe
waterheater.Drainpansareavailableatyourlocalhardwarestore.
Suchadrainpanmusthave aclearanceofatleast1.0”(2.5cm)
greaterthananypointonthewaterheater’souterjacketandmust
bepipedtoanadequatedrain.Thepanmustnotrestrictcombustion
airow.Forexample,ifacircularpanisused,itmustbeaminimum
of27”(69cm)indiameter.SeeFigure1.
Waterheaterlifedependsuponwaterquality,waterpressureand
theenvironmentinwhichthewaterheaterisinstalled.Waterheaters
aresometimesinstalledinlocationswhereleakagemayresultin
propertydamage,evenwiththeuseofadrainpanpipedtoadrain.
However,unanticipateddamagecanbereducedorpreventedby
aleakdetectororwatershut-offdeviceusedinconjunctionwitha
pipeddrainpan.Thesedevicesareavailablefromsomeplumbing
supplywholesalersandretailers,anddetectandreacttoleakage
in various ways:
• Sensorsmountedinthedrainpanthattriggeranalarmorturnoffthe
incomingwatertothewaterheaterwhenleakageisdetected.
• Sensorsmountedinthedrainpanthatturnoffthewatersupplyto
theentirebuildingwhenwaterisdetectedinthedrainpan.
• Water supplyshut-off devices thatactivatebased onthe water
pressuredifferentialbetweenthecoldwaterandhotwaterpipes
connected to the water heater.
• Devicesthatwillturnoffthegassupplytoagaswaterheaterwhile
atthesametimeshuttingoffitswatersupply.
INSTALLATIONS IN AREAS WHERE FLAMMABLE LIQUIDS
(VAPORS) ARE LIKELY TO BE PRESENT OR STORED
(GARAGES,STORAGEANDUTILITYAREAS,ETC.):Flammable
liquids(suchasgasoline,solvents,propane(LPorbutane,etc.)and
othersubstances(suchasadhesives,etc.)emitammablevapors
whichcanbeignitedbyagaswaterheater’shotsurfaceigniteror
mainburner.Theresultingashbackandrecancausedeathor
serious burns to anyone in the area.
Also,thewaterheatermustbelocatedand/orprotectedsoitisnot
subjecttophysicaldamagebyamovingvehicle.
This water heater must not be installed directly on carpeting.
Carpetingmustbeprotectedbymetalorwoodpanelbeneaththe
applianceextendingbeyondthefullwidthanddepthoftheappliance
byatleast3”(7.6cm)inanydirection,oriftheapplianceisinstalled

11
inanalcoveorcloset,theentireoormustbecoveredbythepanel.
Failuretoheedthiswarningmayresultinarehazard.
Minimum clearances between the water heater and combustible
constructionare0inchatthesidesandrear,5.5”(14.0cm)fromthefront
and12”(30.5cm)fromthetop.(Standardclearance.)Ifclearances
stated on the heater differ from standard clearances, install water
heateraccordingtoclearancesstatedontheheater.
Adequateclearance24”(61.0cm)forservicingthisapplianceshouldbe
consideredbeforeinstallation,suchaschangingtheanodes,etc.
Aminimumclearanceof5.5”(14.0cm)mustbeallowedforaccessto
replaceablepartssuchasthethermostats,drainvalveandreliefvalve.
When installing the heater, consideration must be given to proper
location.Locationselectedshouldbeasclosetothewallaspracticable
andascentralizedwiththewaterpipingsystemaspossible.
FIGURE 4.
INSULATION BLANKETS
Insulationblanketsareavailabletothegeneralpublicforexternaluse
ongaswaterheatersbutarenotnecessarywiththeseproducts.The
purpose of an insulation blanket is to reduce the standby heat loss
encountered with storage tank heaters. Your water heater meets or
exceedstheEnergyPolicyActstandardswithrespecttoinsulationand
standbylossrequirements,makinganinsulationblanketunnecessary.
Shouldyouchoosetoapplyaninsulationblankettothisheater,you
should follow these instructions (For identication of components
mentionedbelow,seeFigure1).Failuretofollowtheseinstructions
canrestrict theair owrequired forproper combustion,potentially
resultinginre,asphyxiation,seriouspersonalinjuryordeath.
•Do notapplyinsulationtothetopofthewaterheater,asthiswill
interferewithsafeoperationoftheblowerassembly.
•Do notcovertheouterdoor,thermostatortemperature&pressure
relief valve.
•Do notallowinsulation to comewithin2”(5.1 cm)oftheoorto
preventblockageofcombustionairowtotheburner.
•Do not cover the instruction manual.  Keep it on the side of the
water heater or nearby for future reference.
•Doobtainnewwarningandinstructionlabelsfromthemanufacturer
forplacementontheblanketdirectlyovertheexistinglabels.
•Do inspect the insulation blanket frequently to make certain it
doesnotsag,therebyobstructingcombustionairow.
COMBUSTION AIR AND VENTILATION
Agaswaterheatercannotoperateproperlywithoutthecorrectamount
ofairforcombustion.Donotinstallinaconnedareasuchasacloset,
unless you provide air as shown in the “Facts to ConsiderAbout
Location”section.Neverobstructtheowofventilationair.Ifyouhave
anydoubtsorquestionsatall,callyourgassupplier.Failuretoprovide
theproperamountofcombustionaircanresultinareorexplosion
andcausedeath,seriousbodilyinjury,orpropertydamage.
FIGURE 5.
Ifthiswaterheaterwillbeusedinbeautyshops,barbershops,cleaning
establishments,orself-servicelaundrieswithdrycleaningequipment,
itisimperativethatthewaterheater(s)beinstalleddirectventsothat
allairforcombustionandventilationistakenfromoutdoors.
Propellants of aerosol sprays and volatile compounds, (cleaners,
chlorinebasedchemicals,refrigerants,etc.)inadditiontobeinghighly
ammableinmanycases,willalsoreacttoformcorrosivehydrochloric
acidwhenexposedtothecombustionproductsofthewaterheater.
Theresultscanbehazardous,andalsocauseproductfailure.
APPLIANCES IN UNCONFINED SPACES
UNCONFINED SPACE is space whose volume is not less than
50cubicfeetper1,000Btuperhour(4.8cubicmetersperkW)ofthe
aggregateinputratingofallappliancesinstalledinthatspace.Rooms
communicatingdirectlywiththespaceinwhichtheappliancesare
installed,throughopeningsnotfurnishedwithdoors,areconsidered
apartoftheunconnedspace.
In unconned spaces in buildings, inltration may be adequate to
provide air for combustion, ventilation and dilution of ue gases.
However, in buildings of tight construction (for example, weather
stripping,heavilyinsulated,caulked,vaporbarrier,etc.),additionalair
mayneedtobeprovidedusingthemethodsdescribedin“Appliances
inConnedSpace”thatfollows.”
APPLIANCES IN CONFINED SPACES
CONFINED SPACEisaspacewhosevolumeislessthan50cubic
feetper1,000Btuperhour(4.8cmperkW)oftheaggregateinput
ratingofallappliancesinstalledinthatspace.
Whendrawingcombustionairfrominsideaconventionallyconstructed
buildingtoaconfinedspace,suchaspaceshouldbeprovided
withtwopermanentopenings.ONEWITHIN12INCHES(30cm)
OFTHEENCLOSURETOPANDONEWITHIN12INCHES(30
cm)OFTHEENCLOSUREBOTTOM.Eachopeningshouldhave

12
afreeareaofonesquareinchper1000Btu/hr(22cm2/kW)ofthe
totalinputofallappliancesintheenclosure,butnotlessthan100
squareinches(645cm2).
Iftheconnedspaceiswithinabuildingoftightconstruction,airfor
combustionandventilationmustbeobtainedfromoutdoors.When
directlycommunicatingwiththeoutdoorsorcommunicatingthrough
verticalducts,twopermanentopenings,locatedintheabovemanner,
shouldbeprovided.Eachopeningshouldhaveafreeareaofnotless
thanonesquareinchper4000Btu/hr(5.5cm2/kW)oftotalinputofall
appliancesintheenclosure.Ifhorizontalductsareused,eachopening
shouldhaveafreeareaofnotlessthanonesquareinchper2000Btu/
hr(11cm2/kW)ofthetotalinputofallappliancesintheenclosure.
A. ALL AIR FROM INSIDE BUILDINGS: (SeeFigure5and6)
The conned space should be provided with two permanent openings
communicating directly with an additional room(s) of sufcient volume
so that the combined volume of all spaces meets the criteria for an
unconnedspace.Thetotalinputofallgasutilizationequipmentinstalled
inthecombinedspaceshouldbeconsideredinmakingthisdetermination.
Each opening should have a minimum free area of one square inch
per 1,000 Btu per hour (22 cm2/kW) of the total input rating of all gas
utilizationequipmentintheconnedspace,butnotlessthan100square
inches (645 cm2).Oneopening should commencewithin 12 inches
(30cm)ofthetopandonecommencingwithin12inches(30cm)ofthe
bottomoftheenclosures.
FIGURE 6.
B. ALL AIR FROM OUTDOORS:(SeeFigures7,8and9)
The confined space should be provided with two permanent
openings,onecommencingwithin12inches(30cm)ofthetopand
onecommencing within12 inches (30cm) fromthe bottom ofthe
enclosure.Theopeningsshouldcommunicatedirectly,orbyducts,
withtheoutdoorsorspaces(crawlorattic)thatfreelycommunicate
with the outdoors.
1. Whendirectlycommunicatingwiththeoutdoors,eachopeningshould
have
aminimumfreeareaof1squareinchper4,000Btuperhour(5.5cm2/
kW)
oftotalinputratingofallequipmentintheenclosure,seeFigure7.
FIGURE 7.
2. Whencommunicatingwiththeoutdoorsthroughverticalducts,each
openingshouldhaveaminimumfreeareaof1squareinchper4,000
Btuperhour(5.5cm2/kW)oftotalinputratingofallequipmentinthe
enclosure,seeFigure8.
3. Whencommunicatingwiththeoutdoorsthroughhorizontalducts,each
openingshouldhaveaminimumfreeareaof1squareinchper2,000
Btuperhour(11cm2/kW))oftotalinputratingofallequipmentinthe
enclosure,seeFigure9.
FIGURE 8.
4. Whenductsareused,theyshouldbeofthesamecross-sectionalarea
asthefreeareaoftheopeningstowhichtheyconnect.Theminimum
shortsidedimensionofrectangularairductsshouldnotbelessthan
3inches(7.6cm),seeFigure9.
FIGURE 9.
5. Alternatively a single permanent opening may be used when
communicatingdirectlywiththeoutdoors,orwithspacesthatfreely
communicatewiththeoutdoors.Theopeningshouldhaveaminimum
freeareaof1squareinchper3,000BTUperhour(8.3cm2/kW)oftotal
inputratingofallequipmentinenclosure.SeeFigure9A.
FIGURE 9.
6.LouversandGrilles:Incalculatingfreearea,considerationshouldbe
givento
theblockingeffectoflouvers,grillesorscreensprotectingopenings.
Screensusedshouldnotbesmallerthan1/4inch(6.4mm)mesh.Ifthefree
areathroughadesignoflouverorgrilleisknown,itshouldbeusedincalculating
thesizeopeningrequiredtoprovidethefreeareaspecied.Ifthedesignand
freeareaisnotknown,itmaybeassumedthatwoodlouverswillbe20-25
percentfreeareaandmetallouversandgrilleswillhave60-75percentfree
area.Louversandgrillesshouldbexedintheopenpositionorinterlockedwith
theequipment
sothattheyareopenedautomaticallyduringequipment
operation.
7.SpecialConditionsCreatedbyMechanicalExhaustingorFireplaces:
operationof exhaust fans, ventilationsystems, clothes dryersor
replacesmaycreateconditionsrequiringspecialattentiontoavoid
unsatisfactoryoperationofinstalledgasutilizationequipment.

13
CLOSED WATER SYSTEMS
Water supply systems may, because of code requirements or such
conditionsashighlinepressure,amongothers,haveinstalleddevices
suchaspressurereducingvalves,checkvalves,andbackowpreventers.
Devicessuchasthesecausethewatersystemtobeaclosedsystem.
THERMAL EXPANSION
Aswaterisheated,itexpands(thermalexpansion).Inaclosedsystem
thevolumeofwaterwillgrowwhenitisheated.Asthevolumeofwater
growstherewillbeacorrespondingincreaseinwaterpressuredue
tothermalexpansion.Thermalexpansioncancauseprematuretank
failure(leakage).Thistypeoffailureisnotcoveredunderthelimited
warranty.Thermalexpansioncanalsocauseintermittenttemperature-
pressurereliefvalveoperation:waterdischargedfromthevalvedueto
excessivepressurebuildup.Thetemperature-pressurereliefvalveis
notintendedfortheconstantreliefofthermalexpansion.Thiscondition
isnotcoveredunderthelimitedwarranty.
A properly sized thermal expansion tank should be installed
on all closed systems to control the harmful effects of thermal
expansion..
FIGURE 10.
NOTE: To protect against untimely corrosion of hot and cold
water ttings, it is strongly recommended that di-electric unions
or couplings be installed on this water heater when connected
to copper pipe, see Figure 2 also.
CHEMICAL VAPOR CORROSION
CORROSION OF THE FLUEWAYS AND VENT SYSTEM MAY OCCUR IF
AIR FOR COMBUSTION CONTAINS CERTAIN CHEMICAL VAPORS. SUCH
CORROSION MAY RESULT IN FAILURE AND RISK OF ASPHYXIATION.
Spray can propellants, cleaning solvents, refrigerator and air
conditioning refrigerants, swimming pool chemicals, calcium and
sodiumchloride(watersoftenersalt),waxes,andprocesschemicals
aretypicalcompoundswhicharepotentiallycorrosive.
Donotstoreproductsofthissortneartheheater.Also,airwhichis
brought in contact with the heater should not contain any of these
chemicals.Ifnecessary,uncontaminatedairshouldbeobtainedfrom
remoteoroutsidesources.Thelimitedwarrantyisvoidedwhenfailure
ofwaterheaterisduetoacorrosiveatmosphere.(Seelimitedwarranty
forcompletetermsandconditions).
WATER PIPING
HOTTER WATER CAN SCALD:
Waterheatersareintendedtoproducehotwater.Waterheatedtoa
temperaturewhich willsatisfyspace heating,clothes washing, dish
washing,cleaningandothersanitizingneedscanscaldandpermanently
injureyouuponcontact.Somepeoplearemorelikelytobepermanently
injuredbyhotwaterthanothers.Theseincludetheelderly,children,the
physicallyordevelopmentallydisabled.Ifanyoneusinghotwatertsinto
oneofthesegroupsorifthereisalocalcodeorstatelawrequiringa
certaintemperaturewateratthehotwatertap,thenyoumusttakespecial
precautions.Inadditiontousingthelowestpossibletemperaturesetting
thatsatisesyourhotwaterneeds,ameanssuchasa*mixingvalve,
shouldbeusedatthehotwatertapsusedbythesepeopleoratthewater
heater,seeFigure2.Valvesforreducingpointofusetemperatureby
mixingcoldandhotwaterarealsoavailable:
Consult a Qualied Installer or ServiceAgency. Follow  manufacturer’s
instructions for installation of the valves. Before changing the factory
setting on the thermostat, read the “Temperature Regulation” section in
thismanual.
Thiswaterheatershouldnotbeconnectedtoanyheatingsystemsor
component(s)usedwithanon-potablewaterheatingappliance.
All piping components connected to this unit for space heating
applicationsshouldbesuitableforusewithpotablewater.
Toxicchemicals,suchasthoseusedforboilertreatmentshouldnotbe
introducedintothissystem.
When the system requires water for space heating at temperatures
higherthanrequiredfordomesticwaterpurposes,amixingvalvemustbe
installed.PleaserefertoFigure2forsuggestedpipingarrangement.
INSTALLING THE NEW WATER HEATER

14
Figures2and10showthetypicalattachmentofthewaterpipingto
thewater heater.The waterheater isequipped with3/4 inchNPT
water connections.
NOTE: If using copper tubing, solder tubing to an adapter
before attaching the adapter to the water heater connections.
Do not solder the water lines directly to the water heater
connections. It will harm the dip tube and damage the
tank.
T & P Valve and Pipe Insulation (if supplied)
Remove insulation for T & P valve and pipe connections from
carton.
FIGURE 11.
Fit pipe insulation over the incoming cold water line and the
hotwaterline.Makesurethattheinsulationisagainstthetop
coveroftheheater.FitT&Pvalveinsulationovervalve.Make
sure that the insulation does not interfere with the lever of the
T & P valve.
Secureallinsulationusingtape.
TEMPERATURE-PRESSURE RELIEF VALVE
This heater is provided with a properly certified combination
temperature-pressurereliefvalvebythemanufacturer.
The valve is certied by a nationally recognized testing laboratory
thatmaintainsperiodicinspectionofproductionoflistedequipmentof
materialsasmeetingtherequirementsforReliefValvesforHotWater
SupplySystems,ANSIZ21.22•CSA4.4,andthecoderequirements
of ASME.
Ifreplaced,thevalvemustmeettherequirementsoflocalcodes,but
notless thana combinationtemperature and pressurerelief valve
certiedasindicatedintheaboveparagraph.
The valve must be marked with a maximum set pressure not to
exceedthemarkedhydrostaticworkingpressureofthewaterheater
(150psi=1,035kPa)andadischargecapacitynotlessthanthe
water heater
Btu/hr input rate as shown on the water heater’s
modelratingplate.
Forsafeoperationofthewaterheater,thereliefvalvemustnotbe
removedfromitsdesignatedopeningnorplugged.
Thetemperature-pressurereliefvalvemustbeinstalleddirectlyinto
thettingofthewaterheaterdesignedforthereliefvalve.Position
the valve downward and provide tubing so that any discharge will
exitonlywithin6inches(15.2cm)above,oratanydistancebelow
thestructuraloor.Becertainthatnocontactismadewithanylive
electricalpart.Thedischargeopeningmustnotbeblockedorreduced
insizeunderanycircumstances.Excessivelength,over30feet(9.14
m),oruseofmorethanfourelbowscancauserestrictionandreduce
thedischargecapacityofthevalve,seeFigures10.
Novalveorotherobstructionistobeplacedbetweentherelief
valveandthetank.Donotconnecttubingdirectlytodischarge
drainunlessa6”(15.2cm)airgapisprovided.Topreventbodily
injury,hazardto life,orproperty damage,the reliefvalvemust
beallowedtodischargewaterinquantitiesshouldcircumstances
demand.Ifthedischargepipeisnotconnectedtoadrainorother
suitablemeans,thewaterflowmaycausepropertydamage.
TheDischargePipe:
•Shouldnotbesmallerinsizethantheoutletpipesizeofthevalve,or
haveanyreducingcouplingsorotherrestrictions.
•Shouldnotbepluggedorblocked.
•Shouldbeofmateriallistedforhotwaterdistribution.
•Shouldbeinstalledsoastoallowcompletedrainageofboththe
temperature-pressurereliefvalve,andthedischargepipe.
•Shouldterminateatanadequatedrain.
•Should not have any valve between the relief valve and
tank.

15
The temperature-pressure relief valve must be manually
operatedatleastonceayear,seeFigure28.Cautionshouldbe
takentoensurethat(1)nooneisinfrontoforaroundtheoutlet
ofthetemperature-pressurereliefvalvedischargeline,and(2)
thewatermanuallydischargedwillnotcauseanybodilyinjury
orpropertydamagebecausethewatermaybeextremelyhot.
Ifaftermanuallyoperatingthevalve,itfailstocompletelyreset
andcontinuestoreleasewater,immediatelyclosethecoldwater
inlet to the water heater, follow the draining instructions, and
replacethetemperature-pressurereliefvalvewithanewone.
GAS PIPING
Makesuregassuppliedissametypelistedonmodelratingplate.The
inletgaspressuremustnotexceed14inchwatercolumn(3.5kPa)
fornaturalandpropanegas(L.P.).Theminimuminletgaspressure
shownonratingplateisthatwhichwillpermitringatratedinput.
All gas piping must comply with local codes and ordinances or with the
National Fuel Gas Code (ANSI Z223.1/ NFPA-54) or the Natural
GasandPropaneInstallationCode(CAN/CSAB149.1)whichever
applies.Copperorbrasstubingandttings(excepttinlinedcopper
tubing)shouldnotbeused.
Ifthegascontrolvalveissubjectedtopressuresexceeding1/2psi
(3.5kPa),thedamagetothegascontrolvalvecouldresultinare
orexplosionfromleakinggas.
IfthemaingaslineShut-offservingallgasappliancesisused,also
turn“off”thegasateachappliance.Leaveallgasappliancesshut
“off”untilthewaterheaterinstallationiscomplete.
A gas line of sufcient size must be run to the water heater.
Consult the current edition of National Fuel Gas Code
(ANSIZ223.1/NFPA54)ortheNaturalGasandPropaneInstallation
Code (CAN/CSA B149.1) and your gas supplier concerning pipe
size.
Theremustbe:
•Areadilyaccessiblemanualshutoffvalveinthegassupply
lineservingthewaterheater,and
• Adripleg(sedimenttrap)aheadofthegascontrolvalvetohelp
preventdirtandforeignmaterialsfromenteringthegascontrol
valve.
•Aflexiblegasconnectororagroundjointunionbetweenthe
shut off valve and control valve to permit servicing of the
unit.
Besuretocheckallthegaspipingforleaksbeforelightingthe
waterheater.Useasoapywatersolution,notamatchoropen
flame.Rinseoffsoapysolutionandwipedry.
HIGH ALTITUDE INSTALLATIONS
Ratedinputsaresuitableupto10,100feet(3,079m)elevation.Consult
thefactoryforinstallationataltitudesover10,100feet(3,079m).
WARNING:
THIS HIGH EFFICIENCY WATER HEATER IS CERTIFIED
FOR USE WITHOUT MODIFICATION FOR AN ALTITUDE OF 10,100
FEET(3,079METERS).INSTALLATIONSABOVETHESEALTITUDES
MAY REQUIRE REPLACEMENT OF BURNER ORIFICE. CALL THE
TECHNICALCENTERAT(800)527-1953FOR
REQUIREMENTS.
Some gas utility companies derate their gas for altitude, making
itunnecessarytoinstallhighaltitudeorices.Callthelocalgasor
utilitycompanytoverifyBTUcontent.
Duetotheinputrationreductionathighaltitudes,theoutputrating
oftheapplianceisalsoreducedandshouldbecompensatedforin
thesizingoftheequipmentforapplications.
Usepipejointcompoundorteontapemarkedasbeingresistant
totheactionofpetroleum[Propane(L.P.)]gases.
Theapplianceanditsgasconnectionmustbeleaktestedbefore
placingtheapplianceinoperation.
TheapplianceanditsindividualShut-offvalveshouldbedisconnected
fromthegassupplypipingsystemduringanypressuretestingof
thatsystemattestpressuresinexcessof1/2poundpersquareinch
(3.5kPa).Itshouldbeisolatedfromthegassupplypipingsystem
byclosingitsindividualmanualShut-offvalveduringanypressure
testingofthegassupplypipingsystemattestpressuresequalto
orlessthan1/2poundpersquareinch(3.5kPa).
IMPORTANT: MAKE SURE THE GAS LINE IS PIPED IN WITH
HARD PIPE. AVOID FLEX LINE CONSTRUCTION FOR GAS DUE
TO POSSIBLE GAS FLOW PROBLEMS.

16
SEDIMENT TRAPS
Asedimenttrapshouldbeinstalledasclosetothegasinletofthewater
heateraspracticalatthetimeofwaterheaterinstallation.Thesediment
trapshouldbeeitherateettingwithacappednippleinthebottom
outletorotherdevicerecognizedasaneffectivesedimenttrap.
Contaminantsinthegaslinesmaycauseimproperoperationofthe
gascontrolvalvethatmayresultinreorexplosion.Beforeattaching
thegaslinebesurethatallgaspipeiscleanontheinside.Totrapany
dirtorforeignmaterialinthegassupplyline,adripleg(sometimes
calledasedimenttrap)mustbeincorporatedinthepiping.Thedrip
legmustbereadilyaccessible.Installinaccordancewiththe“Gas
Piping” section. Refer to the current edition of the National Fuel
GasCode(ANSIZ223.1/NFPA54)ortheNaturalGasandPropane
InstallationCode(CAN/CSAB149.1).
FILLING THE WATER HEATER
Neverusethiswaterheaterunlessitiscompletelyfullofwater.Toprevent
damagetothetank,thetankmustbelledwithwater.Watermustow
fromthehotwaterfaucetbeforeturning“ON”gastothewaterheater.
Tollthewaterheaterwithwater:
1. Closethewaterheaterdrainvalvebyturningthehandletotheright
(clockwise).Thedrainvalveisonthelowerfrontofthewaterheater.
2. Open the cold water supply valve to the water heater.
NOTE: The cold water supply valve must be left open when
the water heater is in use.
3. Toinsurecompletellingofthetank,allowairtoexitbyopeningthe
nearesthotwaterfaucet.Allowwatertorununtilaconstantowis
obtained.Thiswillletairoutofthewaterheaterandthepiping.
4. Checkallwaterpipingandconnectionsforleaks.Repairasneeded.
VENTING
VENT PIPE TERMINATION
Thefirststepistodeterminewheretheventpipewillterminate.
SeeFigures19,20,and21.Theventmayterminatethrougha
sidewallasshowninFigure19orthroughtheroofasshownin
Figures20and21.
The vent system must terminate so that proper clearances
are maintained as cited in local codes or the current
edition of the National Fuel Gas Code, (ANSI Z223.1, 12.9.1
through 12.9.4) or the Natural Gas and Propane Installation
Code(CAN/CSA-B149.1).
Instructionsonproperinstallationthroughasidewallareprovided
inFigures15A,15B,15C,and15D.
Plan the vent system layout so that proper clearances are
maintainedfromplumbingandwiring.
Ventpipes servingpower vented appliances are classified by
buildingcodesas“ventconnectors”.Requiredclearancesfrom
combustible materials must be provided in accordance with
informationinthismanualunderFACTS TO CONSIDER ABOUT
LOCATION and INSTALLING THE WATER HEATER, and with
the National Fuel Gas Code and local codes.

17
FIGURE 15B.
U.S. POWER VENT
CANADIAN POWER VENT
WARNING
VENT HOOD(S) MAY BE
EXTREMELY HOT
DURING OPERATION.
WARNING
VENT HOOD(S) MAY BE
EXTREMELY HOT
DURING OPERATION.
FIGURE 15A.
CAUTION
TO PREVENT EXHAUSTING PRODUCTS FROM CIRCULATING TO THE AIR INTAKE IN
WINDY/COLD AREAS, THE MAXIMUM PRACTICAL DISTANCE BETWEEN THESE TWO
TERMINALS IS RECOMMENDED.

18
FIGURE 15D.
U.S. DIRECT VENT
CANADIAN DIRECT VENT
WARNING
VENT HOOD(S) MAY BE
EXTREMELY HOT
DURING OPERATION.
WARNING
VENT HOOD(S) MAY BE
EXTREMELY HOT
DURING OPERATION.
FIGURE 15C.
CAUTION
TO PREVENT EXHAUSTING PRODUCTS FROM CIRCULATING TO THE AIR INTAKE IN
WINDY/COLD AREAS, THE MAXIMUM PRACTICAL DISTANCE BETWEEN THESE TWO
TERMINALS IS RECOMMENDED.

19
PLANNING THE VENT SYSTEM
Planthe routeof thevent system fromthe exhaustelbow tothe
plannedlocationoftheventterminal.
1. Layouttotalventsystemtouseaminimumofventpipeandelbows.
2. Thiswaterheateriscapableofventinguegasesequivalentto
25’(7.6m)of2”pipe,65’(19.8m)of3”pipe,or128’(39.0m)of
4”pipeaslistedinTable1.
TABLE 1
Number of 2” Maximum 3” Maximum 4” Maximum
90° Elbows Pipe - ft. (m) Pipe - ft. (m) Pipe - ft. (m)
 1 20(6.1) 60(18.3) 120(36.6)
 2 15(4.6) 55(16.8) 112(34.1)
 3 10(3.0) 50(15.2) 104(31.7)
 4 -- 45(13.7) 96(29.3)
 5 -- 40(12.2) 88(26.8)
 6 -- 35(10.7) 80(24.3)
Theminimumventlengthsforeachofthepipesizesisone90°plus
2’(61cm)ofstraightpipeandtheappropriatetermination.
NOTE:Theequivalentfeet(m)ofpipelistedaboveareexclusive
of the  termination.That is,the termination,with an installed
screen,isassumedtobeinthesystemandtheremainderofthe
systemmustnotexceedthelengthsdiscussedabove.
3. Theexhaustelbowassemblyisdesignedtoacceptonlystraight
sectionsof2”pipe.Tostart,aminimumof2”(5.1cm)of2”pipe
mustbe insertedand gluedto the exhaust elbow assembly if
utilizing3”or4”ventpipe.Usethesamemethodwiththeblower
inletifadirectventcongurationisutilized.
If using 2” inch vent pipe:
 Aminimumof2”(5.1cm)diameterventpipemustbeattached
totheexhaustelbowassembly.Thetotalsystemcannotexceed
thelengthsdiscussed above,whereeachelbow isequalto5
equivalentfeet(1.5m)ofstraightpipe.
If using 3” or 4” inch vent pipe:
 Twoinches(5.1cm)of2”pipemustbeattachedtotheexhaust
elbowassemblybeforeaddingareducertoacquirethedesired
pipediameter.Anappropriatelysized45degreeelbow(supplied
locally-aschedule40DWV)ventterminalmustbeobtainedwith
anequivalentscreen(suppliedinventkit).Thetotalsystemcannot
exceedtheequivalentpipelengthsdiscussedabovewhereeach
elbowisequalto5feet(1.5m)ofstraightpipe(3”ventpipe)or8
feet(2.4m)ofstraightpipe(4”ventpipe).
U.S. INSTALLATIONS:
NOTE: ThisunitcanbeventedwithPVCpipematerials(CellularCore
ASTM-F891;DWVASTM-D2665orCSAB181.2;Schedule40,80,
120ASTM-D1785orCSAB137.3;orSDRSeriesASTM-D2241or
CSAB137.3),CPVCpipematerials(CPVC41ASTM-D2846orCSA
B137.6;Schedule40,80ASTM-F441orCSAB137.6;orSDRSeries
ASTM-F442),ABSpipematerials(Schedule40DWVASTM-D2661
orCSAB181.1orSchedule40DWVCellularCoreASTM-F628).The
ttings,otherthanthe TERMINATION should be equivalent to PVC-
DWVttingsmeetingASTMD-2665(UseCPVCttings,ASTMF-438
forCPVCpipeandABSttings,ASTMD-2661/3311forABSpipe).
IfCPVCorABSpipeandttingsareused,thenpropercementmust
beusedforalljoints,includingjoiningthepipetoTermination(PVC
Material).IflocalcodesdonotallowtheuseofthePVCtermination
whenamaterialotherthanPVCisusedforventing,thenanequivalent
ttingofthatmaterialmaybesubstitutedifthescreeninthePVC
terminalisremovedandinsertedintothenewtting.
Canadian Installation of this water heater must comply with CAN/
CSA B149.1 - Natural Gas and Propane Installation Code which
requires the vent system components be certied to ULC S636.
ThiswaterheaterhasbeendesigncertiedtobeventedwithPVC
pipecertiedandmarkedascomplyingwithULCS636.Thiswater
heaterissuppliedwitha2inch22.5degreeterminationelbowthatisa
specialttingthatmustbeusedwiththeappliance.Anyoutletpiping,
ttingsandglueusedtoventthisappliancethatisnotsuppliedbythe
manufacturermustcomplywiththeULCS636requirements.
 PVCMaterialsshoulduseASTMD-2564GradeCement;CPVC
Materials should useASTM F-493 Grade Cement andABS
MaterialsshoulduseASTMD-2235GradeCement.
 Ifthewaterheaterisbeinginstalledasareplacementforanexisting
powerventedheaterinpre-existingventing,athoroughinspection
ofexistingventingsystemmustbeperformedpriortoanyinstallation
work.Verifythatcorrectmaterialasdetailedabovehasbeenused,
andthattheminimumormaximumventlengthsandterminallocation
asdetailedinthismanualhavebeenmet.Carefullyinspecttheentire
ventingsystemforanysignsofcracksorfractures,particularlyat
jointsbetweenelbowsandotherttingsandstraightrunsofvent
pipe.Checksystemforsignsofsaggingorotherstressesinjointsas
aresultofmisalignmentofanycomponentsinthesystem.Ifanyof
theseconditionsarefound,theymustbecorrectedinaccordancewith
theventinginstructionsinthismanualbeforecompletinginstallation
andputtingthewaterheaterintoservice.
NOTE: A. For water heaters in locations with high ambient
temperatures(above100°F)it isrecommendedthatCPVCor
ABSpipeandttingsbeused.B.A22.5degreeelbow(2”vent
pipe)ora45degreeelbow(3”and4”ventpipe)withaninstalled
screen VENT TERMINAL must be used in all cases.
4. Therewillbesomeinstallationswherecondensatewillbeformed
inthehorizontalrunsoftheventsystem. This condensate will
runintothecondensateelbow.Thewaterheaterisshippedwith
a condensate hose that attaches to the condensate elbow. No
otherteeorttingisrequired.
CONDENSATE
Thiswaterheaterisacondensingunitandrequiresadraintobelocatedin
closeproximitytoallowthecondensatetodrainsafely.Thecondensate
drainsfromtheunitattheexhaustteelocatedatthebottomoftheunit
(seegure16).Condensatefromthiswaterheaterismildlyacidic.
Pleasenotethatsomelocalcodesrequirethatcondensateistreated
byusingapHneutralizinglterpriortodisposal.
Cautionmustbeusedtoensurethatthedrainisfreeandclearofdebris
andwillnotallowbackowthroughthecondensatehose.Consideration
must be given to avoid freezing of the condensate lines which could
result in excessive build up of condensate inside the water heater.
Waterproof heat tape may be required to prevent freezing of the condensate
lines. Please ensure that the outlet of the condensate drain does
notcreateaslipperyconditionwhichcouldleadtopersonalinjury.
CONDENSATION WARNING: THIS WATER HEATER IS ACONDENSING
UNIT AND REQUIRES A DRAIN TO BE LOCATED IN CLOSE PROXIMITY
TO ALLOW CONDENSATE TO DRAIN SAFELY. THE CONDENSATE
DRAINS FROM UNIT AT THE EXHAUST ELBOW LOCATED AT
BOTTOM OF UNIT. NOTE: IT IS IMPORTANT THAT THE CONDENSATE
HOSE NOT BE ELEVATED ABOVE THE EXHAUST ELBOW, SEE
FIGURE 16. CONDENSATE BUILD-UP WILL BLOCK THE EXHAUST
OUTLET, WHICH WILL CAUSE IMPROPER OPERATION.
FIGURE 16.

20
INSTALLATION OF VENT SYSTEM
Beforebeginninginstallationofpipingsystemthoroughlyread
thesectionofthismanualVENTPIPEPREPARATION.
If you are installing your system so that it vents through roof,
please refer to section  titled INSTALLATION OF VERTICAL
VENT SYSTEM.
VENT TERMINAL INSTALLATION, SIDEWALL
1. Installtheventterminalbyusingthecoverplateasatemplate
tomarktheholefortheventpipetopassthroughthewall.
BEWARE OF CONCEALED WIRING AND PIPING INSIDE
THE WALL.
2. Ifthe Vent Terminalis beinginstalled on theoutside of a
finishedwall,itmaybeeasiertomarkboththeinsideand
outsidewall.Aligntheholesbydrillingaholethroughthe
centerofthetemplatefromtheinsidethroughtotheoutside.
Thetemplatecannowbepositionedontheoutsidewallusing
thedrilledholeasacenteringpointforthetemplate.
3. A)MASONRYSIDEWALLS
 Chiselanopeningapproximatelyonehalfinch(1.3cm)larger
thanthemarkedcircle.
 B)WOODENSIDEWALLS
 Drillapilotholeapproximatelyonequarterinch(0.64cm)outside
ofthemarkedcircle.Thispilotholeisusedasastartingpoint
fora saws-all or sabre sawblade. Cutaround themarked
circlestayingapproximatelyonequarterinch(0.64cm)outside
ofthe line. (Thiswill allowthe vent to easily slidethrough
the opening. The resulting gap will be covered up by the
VentTerminalcoverplate.)Repeatthissteponinsidewallif
necessary.
SEQUENCE OF INSTALLATIONS, FIGURE 18A
CutalengthofPVCpipeabout3.5inches(8.9cm)longerthanthe
wallthickness attheopening. Gluethe ventterminalto this
sectionofpipe.Slidethewallplateoverthepipetostopagainst
theventterminal.Placeabeadofcaulking(notsupplied)around
thegap between thepipe andcover plate. Applyenough to
fillsomeofthegapbetweenthepipeandwall.Placesomeof
thecaulkingonthebackoftheplatetoholditagainstthewall
afterinstallation.Iftheventpipeisinstalleduptothewall,with
acouplingontheendagainstthewallopening,thepipewith
thevent terminalcan be prepared for gluing before inserting
through the wall.  Slide the pipe through the wall and insert
intothecouplingontheothersideofthewall,makingsurethat
theventterminalendsuppointedinthecorrectposition,see
Figure18A.
VENT TERMINATION - FIGURE 18A.
DIRECT VENTING
Theairintakeprovidedontheunitcontainsameshscreentoprevent
largeparticlesfromenteringtheunit.
FIGURE 18B.
WHEN THE UNIT IS TO BE SETUP AS A DIRECT VENT, THE
MESH SCREEN MUST BE REMOVED. THE INLET VENT PIPE
MAYTHENBEGLUEDTOTHEAIRINTAKE(SeeFigure18B)
PROVIDED ON THE UNIT. THE SCREEN REMOVED FROM THE
INTAKENEEDSTOBEINSERTEDINTOTHE2”-22.5DEGREE
VENT TERMINAL SUPPLIED IN THE VENT TERMINAL KIT.
DIRECT VENT TERMINAL INSTALLATION IMPORTANT
THIS UNIT CONSISTS OF TWO VENT TERMINALS - AN INTAKE
VENT TERMINALAND AN EXHAUST VENT TERMINAL. THE INTAKE
VENTTERMINALISA2”22.5°PVCELBOW(-)WITHAMESHWIRE
SCREENANDTHEEXHAUSTVENTTERMINALISA2”22.5°PVC
ELBOW WITH A MESH WIRE SCREEN.
NOTE: TO PREVENT EXHAUSTING PRODUCTS FROM
CIRCULATINGTO THEAIR INTAKE IN WINDY/COLDAREAS,
THE MAXIMUM PRACTICAL DISTANCE BETWEEN THESE TWO
TERMINALS IS RECOMMENDED.
FIGURE 18C.
WHEN LOCATING THE TERMINALS ON A SIDEWALL, THE
FOLLOWING SPECIFICATIONS PERTAINING TO TERMINAL
LOCATION MUST BE FOLLOWED.
1.Theintakeairterminalandtheexhaustventterminalmustterminate
onthesameexteriorwallandmustbeseparatedbyaminimumof
24”(61cm)onverticalcenterline(seeFigure18C).Incolderclimates
increasing the 24” (61cm) minimum will reduce possibility of frost
overfromsidewindsblowingexhaustvaporstotheairintakeofthe
direct vent.
2.Thehorizontalcenterlineoftheintakeairterminalmaynotbelocated
lowerthanthehorizontalcenterlineoftheexhaustventterminal(see
Figure18C).