Giant UG40-92TFTT-N2U Specification sheet

— 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 electrical switch; do not use any phone in your building.
If you cannot reach your gas supplier, call the fire department.
—
may result causing property damage, personal injury or death.
WARNING
READ ALL OF THE INSTRUCTIONS THOROUGHLY BEFORE INSTALLING OR OPERATING THIS WATER HEATER.
safety
-30.
performed.
UG40-92TFTT-N2U (Natural Gas)
UG40-92TFTT-P2U (Propane)
Water Heater
FOR INDOOR APPLICATIONS ONLY
ANS Z21.10.3
CSA 4.3
Hybrid Tank-Tankless Water Heater
54000052 GI-IM046En-0713
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•
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2GiantManual

TableofContents
Thisisthesafetyalertsymbol.Thissymbolalertsyoutopotenalhazardsthatcankillorhurtyou
andothers.
Indicatesanimminentlyhazardoussituaonwhich,ifnotavoided,willresultinserious
injuryordeath.
Indicatesapotenallyhazardoussituaonwhich,ifnotavoided,couldresultinserious
injuryordeath.
Indicatesapotenallyhazardoussituaonwhich,ifnotavoided,couldresultinminoror
moderateinjury.Itmayalsobeusedtoalertagainstunsafepracces.
DANGER
CAUTION
WARNING
SafetyDefinions
NOTICE:Giantsomemessharescustomercontactinformaonwithbusinessesthatwebelieveprovide
productsorservicesthatmaybeusefultoyou.Byprovidingthisinformaon,youagreethatwecan
shareyourcontactinformaonforthispurpose.Ifyouprefernottohaveyourinformaonsharedwith
thesebusinesses,pleasecontactcustomerserviceandasknottohaveyourinformaonshared.We
willhowever,connuetocontactyouwithinformaonrelevanttotheproduct(s)youregisteredand/
oryouaccountwithus.IfyouhaveanyquesonsorfeelthatthemanualisincompletecontactGiant
at1‐800‐363‐9354.
SafetyDefinions..............................................2
SafetyBehaviorsandPracces
fortheConsumerandInstaller.......................3‐5
InstallaonInstrucons
InstallerQualificaons.....................................6
GeneralInstrucons.........................................6
DetermineInstallaonLocaon......................8
TypicalInstallaonIllustraon.........................9
InstallaonLocaon.......................................11
ChecklisttoDetermineInstallaonLocaon.12
CombusonAirRequirements.................13‐15
VenngRequirements.............................16‐19
ChecklistforCombusonAir
andVenngRequirements............................20
InstallaonofPlumbing.................................21
ChecklistforPlumbing...................................22
Massachuses‐RequiredPlumbing...............23
InstallaonofGasSupply.........................24‐25
ConnectElectricity.........................................26
AdjustforHighAltude.................................26
ChecklistforGasandElectricity.....................26
FinalChecklist................................................27
TechnicalData
Specificaons.................................................28
Dimensions....................................................29
WireDiagram.................................................30
PartsBreakdown............................................31
Operaon
ConsumerOperaonGuidelines
fortheSafeOperaonof
yourWaterHeater.........................................32
HowtousetheTemperatureController.......33
DiagnoscCodesandRemedies...............35‐36
SystemMaintenance
AirScreen.......................................................37
WaterFilter....................................................38
RequiredMaintenance...............................39‐40
ConsumerSupport
WarrantyRegistraonInformaon...............41
LimitedWarranty......................................41‐43

GiantManual3

CAUTION
 BURNHAZARD.Hotexhaustandventmaycause
seriousburns.Keepawayfromwaterheaterunit.
Keepsmallchildrenandanimalsawayfromunit.
 Hotwateroutletpipesleavingtheunitcanbehot
totouch.Inresidenalapplicaons,insulaon
mustbeusedforhotwaterpipesbelow36”(914
mm)duetoburnrisktochildren.
Californialawrequiresthisnocetobeprovided:
California ProposiƟon 65 listschemicalsubstancesknowntothestatetocausecancer,birthdefects,death,
seriousillnessorotherreproducveharm.Thisproductmaycontainsuchsubstances,betheiroriginfromfuel
combuson(gas,oil)orcomponentsoftheproductitself.
Safety Behaviors and PracƟces for the Consumer and Installer
 Beforeoperang,smellallaroundtheappliance
areaforgas.Besuretosmellnexttothefloor
becausesomegasisheavierthanairandwillsele
onthefloor.
 Keeptheareaaroundtheapplianceclearandfree
fromcombusblematerials,gasoline,andother
flammablevaporsandliquids.
 Combusbleconstruconreferstoadjacentwalls
andceilingandshouldnotbeconfusedwith
combusbleorflammableproductsandmaterials.
Combusbleand/orflammableproductsand
materialsshouldneverbestoredinthevicinityof
thisoranygasappliance.
 Alwayscheckthewatertemperaturebefore
enteringashowerorbath.
 Toprotectyourselffromharm,beforeperforming
maintenance:
 Turnofftheelectricalpowersupplyby
unpluggingthepowercordorbyturningoffthe
electricityatthecircuitbreaker.(The
temperaturecontrollerdoesnotcontrolthe
electricalpower.)
 Turnoffthegasatthemanualgasvalve,usually
locatedadjacenttothewaterheater.
 Turnofftheincomingwatersupply.Thiscanbe
doneatthecoldwatersupplyvalve
immediatelybelowthewaterheaterorby
turningoffthewatersupplytothebuilding.
WARNING

 Useonlyyourhandtopushinorturnthegas
controlknob.Neverusetools.Iftheknobwillnot
pushinorturnbyhand,donottrytorepairit;calla
licensedprofessional.Forceoraemptedrepair
mayresultinafireorexplosion.
 Donotusethisapplianceifanyparthasbeenunder
water.Immediatelycallalicensedprofessionalto
inspecttheapplianceandtoreplaceanypartofthe
controlsystemandanygascontrolwhichhasbeen
underwater.
 Donotusesubstutepartsthatarenotauthorized
forthisappliance.
 Shouldoverheangoccurorthegassupplyfailto
shutoff,turnoffthemanualgascontrolvalvetothe
appliance.
 DonotadjusttheDIPswitchunlessspecifically
instructedtodoso.
 Donotuseanextensioncordoranadapterplug
withthisappliance.
 Anyalteraontotheapplianceoritscontrolscanbe
dangerousandwillvoidthewarranty.
 Makesurethewaterheateranditswaterlinesare
protectedfromfreezing.Damageduetofreezingis
notcoveredbythewarranty.

4GiantManual

WARNING

 Donotusethisapplianceifanyparthasbeen
underwater.Immediatelycallaqualifiedservice
techniciantoinspecttheapplianceandtoreplace
anypartofthecontrolsystemandanygascontrol
whichhasbeenunderwater.
 Anyalteraontotheapplianceoritscontrolscan
bedangerousandwillvoidthewarranty.
 Thisapplianceisequippedwithathree‐prongplug
foryourproteconagainstshockhazardand
shouldbepluggeddirectlyintoaproperly
groundedthree‐prongreceptacle.Donotcutor
removethegroundprongfromthisplug.

ForYourSafety
Donotstoreorusegasolineorother
flammablevaporsandliquidsinthe
vicinityofthisoranyotherappliances.
Storageoforuseofgasolineorother
flammablevaporsorliquidsinthevicinity
ofthisoranyotherappliancecanresultin
seriousinjuryordeath.
FLAMMABLE
FlammableVapors
WARNING
DANGERHotwatercanbedangerous,especiallyforinfantsorchildren,theelderly,
orinfirm.Thereishotwaterscaldpotenalifthethermostatissettoo
high.
Watertemperaturesover125ºF(51ºC)cancausesevereburnsor
scaldingresulngindeath.
Hotwatercancausefirstdegreeburnswithexposureforaslileas:
3secondsat140ºF(60ºC)
20secondsat130ºF(54ºC)
8minutesat120ºF(48ºC)
Testthetemperatureofthewaterbeforeplacingachildinthebathor
shower.
SafetyBehaviorsandPraccesfortheConsumerandInstaller

GiantManual5

SafetyBehaviorsandPraccesfortheConsumerandInstaller
FVIR(FlammableVaporIgnionResistant)Sensor
Flammableliquidssuchascleaningsolvents,aerosols,paintthinners,adhesives,gasolineandpropanemustbe
handledandstoredwithextremecare.Theseflammableliquidsemitflammablevaporsandwhenexposedtoan
ignionsourcecanresultinafirehazardorexplosion.Flammableliquidsshouldnotbeusedorstoredinthe
vicinityofthisoranyotherappliance.
ThiswaterheaterisequippedwithaflammablevaporsensorandmeetstherequirementsofANSIZ21.10.1If
flammablevaporsaredetected,theflammablevaporsensorwillclosethegassupplytothewaterheater,the
ignionsourcewillbedisabledandan“FE”errorcodewillflashonthecontroller.Ifthecontrollerisflashingan
“FE”orifflammablevaporsaresuspected:
 Leavetheareaimmediately,leavingtheexitpointopentoallowvenlaon
 Donottouchanyelectricdevice(includingphoneorlightswitch)
 Callemergencypersonnelfromaneighborsphone
 Donottrytoresetthewaterheaterorlightthepilottoanyotherappliance.Whensafetypersonnelhasidenfied
theareaassafeandallflammablevaporshavebeenremovedandeliminatedfromthearea,theunitscanbe
resetbyunpluggingtheunitthenpluggingbackin.
Donotsprayorusechemicalscontainingbleach,cleaners,polish,silicone,phosphorous,orlubricantsnearthe
waterheater.Thesechemicalswilldamagetheflammablevaporsensor.Nevercleanortamperwiththe
flammablevaporsensor.Donotplacecatlierneartheapplianceasitcancorrodeordamagethesensor.If
thesensoriscorrodedordamageditsreaconmecanbeaffectedanditmaynotreactasdescribed.
WARNING
Installventsystemperlocalandnaonalcodes.
Readandfollowallinstruconsinthissecon.
Donotinstallthiswaterheaterabove5,400(1,646m).
Donotobstructwaterheaterairintake.
Donotoperatewaterheaterifflooddamaged.
Failuretoproperlyventthisappliancecanresultindeath,personal
injuryand/orpropertydamage.
Everyhomeshouldhaveacarbonmonoxide(CO)alarminthehall‐
waynearbedroomsineachsleepingarea.Checkbaeriesmonthly
andreplacethemannually.
WARNINGCarbonMonoxideHazard

6GiantManual

Alicensedprofessionalmustinstalltheappliance,
inspectit,andleaktestitbeforeuse.Thewarranty
willbevoidedduetoimproperinstallation.
Theinstallershouldhaveskillssuchas:
 gassizing
 connectinggaslines,waterlines,valves,and
electricity
 knowledgeofapplicablenational,state,and
localcodes
 installingventingthroughawallorroof
 VentingCategoryI,FanAssistAppliancesper
NFPA54andlocalcodes
Ifyoulacktheseskillscontactalicensedprofessional.
InstallationInstructions
InstallationSteps
DetermineInstallationLocation................8
TypicalInstallationIllustration..................9
InstallationLocation................................11
ChecklisttoDetermine
InstallationLocation................................12
CombustionAirRequirements...........13‐15
VentingRequirements........................16‐19
ChecklistforCombustionAir
andVentingRequirements......................20
InstallationofPlumbing...........................21
ChecklistforPlumbing.............................22
Massachusetts‐RequiredPlumbing.........23
InstallationofGasSupply...................24‐25
ConnectElectricity...................................26
AdjustforHighAltitude...........................26
ChecklistforGasandElectricity..............26
FinalChecklist..........................................27
GeneralInstructionsInstallerQualifications
DONOT
 DonotinstalltheUG40‐92TFTT‐N2UorUG40‐
92TFTT‐P2Uoutdoors.
 Donotinstalltheapplianceinanareawherewater
leakageoftheunitorconnectionswillresultin
damagetotheareaadjacenttotheapplianceorto
lowerfloorsofthestructure.Whensuchlocations
cannotbeavoided,itisrecommendedthata
suitabledrainpan,adequatelydrained,beinstalled
undertheappliance.Thepanmustnotrestrict
combustionairflow.
 Donotobstructtheflowofcombustionand
ventilationair.
 Donotusethisapplianceinanapplicationsuchas
apoolorspaheaterthatuseschemicallytreated
water.(Thisapplianceissuitableforfillinglargeor
whirlpoolspatubswithpotablewater.)
 Donotusesubstitutepartsthatarenotauthorized
forthisappliance.
MUSTDO
 Theinstallationmustconformwithlocalcodesor,
intheabsenceoflocalcodes,withtheNational
FuelGasCode,ANSIZ223.1/NFPA54,orthe
NaturalGasandPropaneInstallationCode,CSA
B149.1.
 Theappliance,wheninstalled,mustbeelectrically
groundedinaccordancewithlocalcodesor,inthe
absenceoflocalcodes,withtheNationalElectrical
Code,ANSI/NFPA70,ortheCanadianElectrical
Code,CSAC22.1.
 Theapplianceanditsappliancemaingasvalve
mustbedisconnectedfromthegassupplypiping
systemduringanypressuretestingofthatsystem
attestpressuresinexcessof1/2psi(3.5kPa)
(13.84inW.C.).
 Theappliancemustbeisolatedfromthegassupply
pipingsystembyclosingitsindividualmanual
shutoffvalveduringanypressuretestingofthegas
supplypipingsystemattestpressuresequaltoor
lessthan1/2psi(3.5kPa)(13.84inW.C.).

GiantManual7

Prepare for installaƟon
Partsincluded
Toolsneeded
Materialsneeded
 Makesurethewaterheateranditswaterlinesare
protectedfromfreezing.Damageduetofreezingis
notcoveredbythewarranty.
 Youmustfollowtheinstallaoninstruconsand
thoseinCareandMaintenanceforadequate
combusonairintakeandexhaust.
 Installthevacuumreliefvalveperlocalcodes.
 Massachuses248CMRSecon10.14(I)“All
potablewaterpressuretanksshallbeprovided
withavacuumreliefvalveatthetopofthetank
thatwilloperateuptoamaximumwaterpressure
of200P.S.I.G.andtoamaximumwater
temperatureof200ºF(93.3oC).”



INFORMATION
 Ifawaterheaterisinstalledinaclosedwater
supplysystem,suchasonehavingabackflow
preventerinthecoldwatersupplyline,means
shallbeprovidedtocontrolthermalexpansion.
Contactthewatersupplierorlocalplumbing
inspectoronhowtocontrolthermalexpansion.
 Shouldoverheangoccurorthegassupplyfailto
shutoff,turnoffthemanualgascontrolvalveto
theappliance.
 Keeptheairintakelocaonfreeofchemicalssuch
aschlorineorbleachthatproducefumes.These
fumescandamagecomponentsandreducethelife
ofyourappliance.
Waterheater
Temperature‐PressureRelief(T&P)Valve
GasValve
Manometer
Pipewrenches(2)
Adjustablepliers
Screwdrivers(2)
Wirecuers
Gloves
Safetyglasses
Level

Toolsthatmightbeneeded
Saw
Threadingmachinewith
headsandoiler
Torchset
Coppertubingcuer
Steelpipecuer
Materialsthatmaybeneeded
Soapsoluon
Approvedvenng
Teflontape
(recommended)orpipe
compound
Heattape
Pipeinsulaon
Electricalwireand
conduitperlocalcode
Singlegangelectrical
box
Wirenuts
Unionsanddrainvalves
Vacuum Relief Valve
(NotSupplied)
Ifrequired,installperlocalcodeand
valvemanufacturersinstrucons

8Giant Manual
Environment
Air surrounding the water heater is used for
combuson and must be free of any compounds that
cause corrosion of internal components. These
include corrosive compounds that are found in
aerosol sprays, detergents, bleaches, cleaning
solvents, oil based paints/ varnishes, and refrigerants.
The air in beauty shops, dry cleaning stores, photo
processing labs, and storage areas for pool supplies
oen contains these compounds. Therefore it is
recommended that such locaons be avoided.
If it is necessary for a water heater to be located in
areas which may contain corrosive compounds, the
following instrucons are strongly recommended.
IMPORTANT CONSIDERATIONS FOR INSTALLATION:
 DO NOT Install in areas where air for combuson
can be contaminated with chemicals.
 Before installaon, consider where air has the
ability to travel within the building to the water
heater.
 Chemicals that are corrosive in nature should not
be stored or used near the water heater.
Damage and repair due to corrosive compounds in
the air is not covered by warranty.
Consideraon of care for your water heater should
include evaluaon of water quality.
Water that contains chemicals exceeding the levels
below aect and damage the heat exchanger.
Replacement of the heat exchanger due to water
quality damage is not covered by the warranty.
Maximum Level
Total Hardness Up to 200 mg / L
Aluminum * Up to 0.2 mg / L
Chlorides * Up to 250 mg / L
Copper * Up to 1.0 mg / L
Iron * Up to 0.3 mg / L
Manganese * Up to 0.05 mg / L
pH * 6.5 to 8.5
TDS (Total Dissolved Solids) * Up to 500 mg / L
Zinc * Up to 5 mg / L
Determine Installaon Locaon
Water Quality
* Source: Part 143 Naonal Secondary Drinking Water
Regulaons
If you install this water heater in an area that is
known to have hard water or that causes scale build-
up the water must be treated and/or the heat
exchanger ushed regularly.
You must ensure that clearances will be met and that
the vent length will be within required limits.
Consider the installaon environment, water quality,
and need for freeze protecon. Requirements for the
gas line, water lines, and electrical connecon can be
found in their respecve installaon secons of this
manual.

GiantManual9

MinimumClearances
Theminimumclearancesfrombothcombusblesandnon‐combusblesconstruconis:
0inchesfromthesides
0inchesfromtheback
12inches(300mm)fromthetop
4inches(102mm)fromthefront
0”Min0”Min
0”Min
4”Min
12”Min





10GiantManual

AHotWaterOutlet
BHotWaterOutletValve
CTemperature&Pressure‐Relief
Valve
DColdandHotUnions
EColdWaterSupplyValve
FColdWaterSupply
GThermalExpansionTank
H4”(102mm)B‐Vent
ICombusonAirScreen
JOperaonUnit/Temperature
Control
KOutletReceptacle
LDrainPan
MTemperature&Pressure‐Relief
ValveDischargePipe
(donotcap,plug,orreduce)
NDripLeg(SedimentTrap)
OGasUnion
PGasControlValve
QThermostacMixingValve
RNon‐TemperedReturnLine
SNon‐TemperedSupplyLine
*
*

*
*
*
*
*


*
*
*
*
*

*
*
*
TypicalInstallaons
*FieldSupplied
ABD
C
EF
H
P
O
N
J
I
K
G
M
L
S
F
R
QA
MIXINGVALVEINSTALLATION
RETURN
SUPPLY
COLDWATER
SUPPLY
NON‐TEMPERED
SUPPLY
COLDWATER
SUPPLY
HOTWATER
OUTLET

GiantManual11

InstallaƟon LocaƟon
Thiswaterheaterisnotapprovedforuseinmanufactured(mobile)homesoroutdoorinstallaons.
Aƫc
Installaonofthewaterheatermustbeaccomplishedinsuchamannerthatifthetankoranyconneconshould
leak,theflowofwaterwillnotcausedamagetothestructure.Forthisreason,itisnotadvisabletoinstallthe
waterheaterinanacorupperfloor.Whensuchlocaonscannotbeavoided,asuitabledrainpanshouldbe
installedunderthewaterheater.(Seedrainpanbelow)
Garage
Althoughthiswaterheaterisequippedwithaflammablevaporsensor,gasolineandotherflammablesubstances
shouldnotbestoredorusedinthesamevicinityorareaofthewaterheateroranyotherappliancethatmay
produceasparkoropenflame.
ItisnotrequiredtoposionthiswaterheateronastandasthiswaterheatercomplieswiththeFVIR
requirementsandtheburnerandigniterareposionedgreaterthan18inches(457mm)fromthebaseofthe
unit.
Thiswaterheatermustbeposionedorlocatedastonotbesubjecttodamagebyamovingvehicle.
Refertolocalcodeforinstallaonrequirementsinagarage.
Crawl Space
Wheninstallingthiswaterheaterinacrawlspacewithadirtfloor,posionthewaterheateronasolidconcrete
plaorm,orbasetoavoiddamagetotheunit.(Donotusewood)
Drain Pan
Ifthewaterheaterisinstalledinalocaonthatcouldresultindamagetothehomeorstructureprecauons
mustbetakentoprotectthepropertyfromwaterdamage.Intheeventofatankorcomponentfailure,an
appropriatelysizedpanmustbeinstalledunderthewaterheater.Thepanmustdrainwithaminimumdiameter
¾”(19mm)conneconandshallbedrainedperlocalcoderequirements.
Stand
Dependingonlocalcode,astandmaynotberequiredduetotheignionsourcebeingover18”(457mm)from
thebaseoftheappliance.
Alcove or closet
Seeclearancerequirementsandcombusonairrequirements.
InsulaƟon Blanket
ThiswaterheatermeetsorexceedstheNaonalApplianceEnergyConservaonActstandardswithrespectto
insulaonandstandbylosses.Ifaninsulaonblanketisslldesired,thefollowingproceduremustbefollowed.
a.Maintainanadequatedistancefromthevent.
b.Donotcoverthefrontdoorofthetanklessengineorthelowerenclosureoftheassembly.
c.Donotcoverthecombusonairgrilllocatedonthefrontdoorofthetanklessengine.
d.Donotobstructtheoperaonofthepressurereliefvalve.
e.Obtainnewwarninglabelsfromthemanufacturertoplaceontheblanket,directlyovertheexisng
labels.
f.Frequentlyinspecttheblankettoensuretheinsulaonblankethasnotbeendisturbed.

12 Giant Manual
Checklist to Determine Installaon
Locaon
□The water heater is not exposed to corrosive
compounds in the air.
□The water heater locaon complies with the
clearances stated in the manual and on the label,
located on the side of the unit.
□The area surrounding the water heater does not
contain ammable vapors that could ignite.
□The water supply does not contain chemicals or
exceed total hardness that will damage the heat
exchanger.
□ The water heater and its water lines are protected
from freezing.
□A standard 3 prong 120 VAC, 60 Hz properly
grounded wall outlet or other properly grounded
120 VAC, 60 Hz source is available.
□The installaon must conform with local codes or,
in the absence of local codes, with the Naonal
Fuel Gas Code, ANSI Z223.1/NFPA 54, or the
Natural Gas and Propane Installaon Code, CSA
B149.1.
□Leave the enre manual taped to the water
heater or give the enre manual directly to the
consumer.

GiantManual13

CombusƟonAirRequirements
Thiswaterheaterrequiresadequatecombusonairforvenlaonanddiluonoffluegases.Failuretoprovide
adequatecombusonaircanresultinunitfailure,fire,explosion,seriousbodilyinjuryordeath.Usethe
followingmethodstoensureadequatecombusonairisavailableforcorrectandsafeoperaonofthiswater
heater.
Important:Combusonairmustbefreeofcorrosivechemicals.Donotprovidecombusonairfromcorrosive
environments.Appliancefailureduetocorrosiveairisnotcoveredbywarranty.
Combusonairmustbefreeofacidformingchemicalsuchassulfur,fluorineandchlorine.Thesechemicalshave
beenfoundtocauserapiddamageanddecayandcanbecometoxicwhenusedascombusonairingas
appliances.Suchchemicalscanbefoundin,butnotlimitedtobleach,ammonia,catlier,aerosolsprays,
cleaningsolvents,varnish,paintandairfresheners.Donotstoretheseproductsorsimilarproductsinthe
vicinityofthiswaterheater.
Unconfined Space
AnunconfinedspaceisdefinedinNaƟonal Fuel Gas Code, ANSI Z223.1/NFPA 54as“aspacewhosevolumeisnot
lessthan50cubicfeetper1,000BTU/hr(4.8m3perkWperhour)oftheaggregateinputrangofallappliances
installedinthatspace.Roomscommunicangdirectlywiththespaceinwhichtheappliancesareinstalled,
throughopeningsnotfurnishedwithdoors,areconsideredapartoftheunconfinedspace.”Ifthe“unconfined
space”containingtheappliance(s)isinabuildingwithghtconstrucon,addionaloutsideairmayberequired
forproperoperaon.Outsideairopeningsshouldbesizedthesameasforaconfinedspace.
UnconfinedSpaceUnconfinedSpace
91,300BTUWaterHeateranda
100,000BTUFurnace
(7.6m)
(7.6m)
(10.6m)

14GiantManual

Combusonairprovidedtotheapplianceshould
notbetakenfromanyareaofthestructurethat
mayproduceanegavepressure(i.e.exhaust
fans,poweredvenlaonfans).
ConfinedSpace
(SmallRoom,Closet,Alcove,UlityRoom,Etc.)
AconfinedspaceisdefinedintheNaƟonal Fuel Gas
Code, ANSI Z223.1/NFPA 54 as"aspacewhose
volumeislessthan50cubicfeetper1,000BTU/hr
(4.8m3perkWperhour)oftheaggregateinputrang
ofallappliancesinstalledinthatspace."Aconfined
spacemusthavetwocombusonairopenings.Size
thecombusonairopeningsbasedontheBTUinput
forallgasulizaonequipmentinthespaceandthe
methodbywhichcombusonairissupplied:
LouversandGrilles
Whensizingthepermanentopeningasillustratedin
Figure1,consideraonmustbetakenforthedesign
ofthelouversorgrillestomaintaintherequiredfree
arearequiredforallgasulizingequipmentinthe
space.Ifthefreeareaofthelouverorgrilledesignis
notavailable,assumewoodlouverswillhave25%
freeareaandmetallouversorgrilleswillhave75%
freearea.Undernocircumstanceshouldthelouver,
grilleorscreenhaveopeningssmallerthan¼”(6
mm).
Example:
Wood:10in(250mm)x12in(300mm)x0.25=30in2
(193.5cm2)
Metal:10in(250mm)x12in(300mm)x0.75=90in2
(580.6cm2)
Locaon
Tomaintainpropercirculaonofcombusonairtwo
permanentopenings(oneupper,onelower)mustbe
posionedinconfinedspaces.Theuppershallbe
within12inches(300mm)oftheconfinedspaceand
theloweropeningshallbewithin12inches(300mm)
oftheboomoftheconfinedspace.Openingsmust
beposionedastoneverbeobstructed.

CombusonAirRequirements
Figure1

GiantManual15

Whencommunicangindirectlywiththeoutdoors
throughvercalducts,eachopeningshallhavea
minimumfreeareaof1in2/4,000BTU/hr(550
mm2/kW)oftotalinputrangofallappliancesin
theconfinedspace.Combusonairtotheappliance
canbeprovidedfromawellvenlatedacorcrawl
space.
CombusƟonAirRequirements
Using Outdoor Air For CombusƟon
Outdooraircanbeprovidedtoaconfinedspacethroughtwopermanentopenings,onecommencingwithin12
in.(300mm)ofthetopandonecommencingwithin12”(300mm)oftheboom,oftheconfinedspace.The
openingsshallcommunicatetotheoutsidebyoneoftwoways:
Whencommunicangdirectlywiththeoutdoors
throughhorizontalducts,eachopeningshallhavea
minimumfreeareaof1in2/2,000BTU/hr(1,100
mm2/kW)oftotalinputrangofallappliancesin
theconfinedspace.
Note:Ifductsareused,thecrossseconalareaof
theductmustbegreaterthanorequaltothere‐
quiredfreeareaoftheopeningstowhichtheyare
connected.
Using Indoor Air For CombusƟon
Whenusingairfromotherroom(s)inthebuilding,thetotalvolumeoftheroom(s)mustbeofadequatevolume
(Greaterthan50cubicfeetper1,000BTU/hr).EachCombusonairopeningmusthaveat least one square inch
(6.45 cm2) of free area for each 1,000 BTU/hr,butnotlessthan100squareinches(645cm2)each.
Directly through horizontal ducts Indirectly through verƟcal ducts

16GiantManual

Venng
Thiswaterheatermustbeventedvercallytothe
outsideofthebuildingorstructure.
Thiswaterheaterisnotdesignedorcerfiedforside
wallhorizontalventterminaons.
Allinstallaonsmustbeventedinaccordancewith
Naonal Fuel Gas Code, ANSI Z223.1/NFPA 54 ‐latest
edionandtherequirementsofstateorlocalcodes.
InCanada,thefurnacesmustbeventedinaccordance
withtheNaonalStandardofCanada,CAN/CSA
B149.1andCAN/CSAB149.2‐latestedionsand
amendmentsandthecodesofthelocalulityor
otherauthorityhavingjurisdicon.
NOTE:ThevercalheightoftheCategoryIvenng
systemmustbeatleastasgreatasthehorizontal
lengthofthevenngsystem.
VenngRequirements
Screw
VentPipe(4”or102mmdiameter)
ScrewScrew
WARNING
TOPREVENTPOSSIBLEPERSONALINJURYORDEATH
DUETOASPHYXIATION,COMMONVENTINGWITH
OTHERMANUFACTURER’SINDUCEDDRAFT
APPLIANCESISNOTALLOWED.
WARNING
Devicesaachedtotheventsystemintendedto
increasesystemefficiencybyreducingtheheatlossof
theventsystemMUSTnotbeusedonthiswater
heater.Giantacceptsnoliabilityfordamageorinjury
ifsuchdevicesareinstalledontheventsystemwith
thisappliance.
WARNING
VentPipeAssembly:Toavoiddamagetotheventand
ventadapter,predrillholeswitha1/8”(3.1mm)drill
bit.Aachtheventtotheventadapterwith#8screws.
 Allvent(CategoryI)passingthroughaconcealedspace,an
acorfloor,MUSTbeTypeBdoublewallventand/orType
Bdoublewallventconnectors.Forventpassingthroughan
interiorwall,useTypeBventwithvenlatedthimbleONLY.
 TheUG40‐92TFTT‐N2UorUG40‐92TFTT‐P2UCANNOTbe
ventedintoanychimneyservinganopenfireplaceorany
othersolidfuelburningappliance.
 UsethesamediameterCategoryIconnectororventas
permiedbyNFPA54/ANSIZ223.1venngtables.
 Itisnotpermiedtoreduceventdiameter(4”or102mm).
 ItisemphasizedthatvercalCategoryIventorvent
connectorrunsbeasshortanddirectaspossible.
 VercaloutdoorrunsoftypeBorANYsinglewallvent
belowtherooflineareNOTpermied.
 Allhorizontalventrunstobeslopedupawayfromthe
UG40‐92TFTT‐N2UorUG40‐92TFTT‐P2Uaminimumof
¼”(6mm)perfoot.
 Allhorizontalventrunsaretobesupported,ataminimum,
every6'(2m)usingsuitableclampsand/ormetalstraps.
 Exisnggasventorchimneyistobecheckedtoensurethey
meetclearancesandlocalcodes.
TheUG40‐92TFTT‐N2UorUG40‐92TFTT‐P2UcanONLYbe
connectedtoamanufacturedchimneyorventthat
complieswitharecognizedstandard.Venngintoa
masonryorconcretechimneyisonlypermiedasoutlined
intheNFPA54/ANSIZ223.1NaonalFuelGasCodevenng
tables.Itisthereforeacontractualobligaononthepartof
theinstallertofollowallsafevenngrequirements. 
Poisoncarbonmonoxidegashazard
Ifthisapplianceisreplacingapreviouslycommon
ventedwaterheater,itmaybenecessarytoresize
theexisngchimneylinerorventtopreventoversiz‐
ingproblemsfortheotherremainingappliance
(s).Seecodesand/orstandardhavingjurisdicon.
Failuretoproperlyventthiswaterheangappliance
orotherappliance(s)canresultindeath,personal
injuryand/orpropertydamage.
WARNING

GiantManual17

VenƟngRequirements
Vent Dampers
VentdampersmustbecerfiedinaccordancewithANSIZ21.68
Beforeinstallinganyfluedamper,consultthelocalgasauthorityanddampermanufacturerforproper
installaon.
Vent InspecƟon
Theenreventsystem(Combusonairducts,louversetc.,andexhaustvent)mustbecheckedperiodicallyfor
signsofobstruconordamage.Ifdamagedcomponentsareobservedtheymustberepairedorreplaced
immediately.
Vent Size
Thiswaterheaterisequippedwitha4”(102mm)ventadapterandmustneverbeaachedtoaventsmaller
than4”(102mm).Certainapplicaonsmayrequireventdiametersgreaterthan4”(102mm).Consultyourlocal
gassupplierorauthoritytoaidintheproperventdiameterseleconpertherequirementsoftheventtablesin
thecurrentedionoftheNaonalFuelGasCodeANSIZ223.1/NFPA54.
Vent Connectors
VentConnectorsarerelavelyshortrunsofventconnecngtheappliancetothechimneyorvercalventrun.
Followingisalistofappropriateventconnectormaterialforusebetweenthewaterheaterandthechimney:
 TypeB(B‐Vent)Doublewall,U.L.listedventpipe
 TypeB(B‐Vent)Singlewall,U.L.listedventpipe
Notethefollowingwheninstallingaventconnectorfromtheappliancetothechimneyorvercalvent:
Length:Aventconnectorshallbeasshortaspraccalandtheappliancelocatedascloseaspraccaltothe
chimneyorvent.Themaximumhorizontallengthoftheventconnectorcannotexceed75%ofthe
heightofthechimneyorvent.Unnecessarybendsshouldbeavoidedastonotcreateexcessive
resistancetoflowofventgases.
Prohibitedlocaons:VentConnectorscannotpassthroughanyceiling,floor,firewall,orfireparon.
CHIMNEY
OR
MIN.¼inchrise
perfoot
VentConnector
Singlewallventconnectors:Asinglewallvent
connectormustnotpassthroughanyinterior
walls,floorsorceilings.Asinglewallvent
connectormustnotbeinstalledinacs,crawl
spacesoranyotherconfinedspaceorinaccessible
locaon.Maintainaminimumof6”(152mm)from
combusbleswhenusingsinglewalledvent
connectors.
DoubleWalled,B‐Vent:Itisacceptabletopass
throughwallsorparonswithdoublewalled,B‐
Vent.
Slope:Ventconnectorsmustpitch¼inchperfoot
(21mmpermeter)upward.
WARNING
ThermalOperatedVentDampers:ShouldNOTbeusedwiththisappliance.Thisappliancehasathermalefficien‐
cygreaterthan80%.Thishigherefficiencywillresultinlowerfluegastemperatures.Suchtemperaturesmaybe
toolowtoacvateathermaloperatedventdamper.Useofathermaloperatedfluedamperonthisproductmay
resultinspillageofexhaustgasesandulmatelycarbonmonoxidepoisoning.

18GiantManual

Vent TerminaƟon
Allflue(Vent)gasesmustbedirectedtotheoutdoorsofthebuildingorstructureandmustnotterminate
horizontally.
VenƟngRequirements
Lowestdischargeopening
Listed
Cap
Listed
Roofpitchisx/12
H(minimum)–
Minimumheightfrom
Figure 2
x
12
RoofSlope
 m
Flatto6/121.00.30
Over6/12to7/121.250.38
Over7/12to8/121.50.46
Over8/12to9/122.00.61
Over9/12to10/122.50.76
Over10/12to11/123.250.99
Over11/12to12/124.01.22
Over12/12to14/125.01.52
Over14/12to16/126.01.83
Over16/12to18/127.02.13
Over18/12to20/127.52.27
Over20/12to21/128.02.44
H(minimum)
Theventterminaonshallcomplywiththefollowingrequirements:
Ifthegasventis12inches(300mm)orlessindiameterandlocatednotlessthan8(2.4m)fromavercal
wallorsimilarobstrucon,theterminaonmustcomplywiththerequirementsstatedinTable1andFigure
2.Ifthegasventisgreaterthan12inches(300mm)indiameterorlocatedlessthan8(2.4m)froma
vercalwallorsimilarobstrucon,theterminaonmustendnotlessthan2(0.6m)aboveanyporonofa
buildingwithin10(3.0m)horizontally.
B‐Venttypegasventshallterminateatleast5(1.5m)invercalheightabovethehighestconnected
appliancedrahoodorfluecollar.
Decoraveshroudsorcoveringsshallnotbeinstalledoverthegasventterminaonunlesslistedforusewith
thespecificgasventandareinstalledinaccordancewiththemanufacturer’sinstallaoninstrucons.
Allgasventsshallextendthroughtheroofflashing,roofjack,orroofthimbleandterminatewithalistedcap
orlistedroofassembly.
Thegasventshallterminateatleast3(0.9m)aboveanyforcedairinletlocatedwithin10(3.0m).
Table 1
Inspecon:Theenrelengthoftheventconnectorshallbereadilyaccessibleforinspecon,cleaningand
replacement.
Joints:Mustbefastenedbysheetmetalscrewsorotherapprovedmethods.
Support:Ventconnectorsmustbesupportedpertheventmanufacturer’sinstallaoninstruconstoavoid
dipsorsagsintheventandmaintaintherequiredclearances.

Giant Manual 19
Venng Requirements
Masonry Vercal Venng
Masonry Chimneys shall be built and installed in accordance with NFPA 211, Standard for Chimneys, replaces,
Vents and Solid Fuel-Burning Appliances.
Before assembling the vent connector to a chimney, the chimney must be inspected for signs of obstrucon or
damage. If previously used for solid or liquid fuel burning appliances or replaces, the chimney must be cleaned.
Do not connect the vent of this water heater to a chimney servicing a separate solid fuel burning appliance.
Do not connect the vent of this water heater to a le lined masonry chimney. The chimney must be lined with
either B-Vent or a listed chimney lining system.
Connecon to a chimney must be rmly aached, sealed and must be located above the extreme boom of the
chimney.
B-Vent Vercal Venng
Vercal gas vent must be installed with U.L. listed type B-vent material in accordance with the manufacturer’s
installaon instrucons and the requirements stated in the “Naonal Fuel Gas Code”, NFPA 54, ANSI Z223.1-
latest edion and the requirements of local codes.
Vent should extend in a generally vercal direcon. Any vent angle less than 45 degrees is considered horizontal.
The total horizontal distance of the vent system plus the horizontal length of the vent connector must not
exceed 75 percent of the vercal height of the vent.
An unused chimney or masonry enclosure may be used as a chase for the installaon of listed B-vent material.
Common Venng
As a Category I appliance, this water heater can be vented vercally with type B-1 vent systems and lined
masonry chimneys. Follow the Naonal Fuel Gas Code, ANSI Z223.1 and or the Naonal Gas Installaon code,
CSA-B149.1 & .2 for proper installaon pracces. If you are unsure or need assistance in correct applicaon of a
common vent installaon consult the local gas authority for assistance in the vent system design.

20GiantManual

ChecklistforCombustionAirand
VentingRequirements
□Verifyproperclearancesaroundthevents.
□EnsurethattheCombustionAirRequirementsare
followedthatwillprovidesufficientcombustion
airfortheappliance.
□Ensureyouhaveusedthecorrectventing
productsforCategory1andthatyouhave
completelyfollowedtheventingmanufacturer’s
installationinstructionsandtheseinstallation
instructions.Allinstallationsmustbeventedin
accordancewithNationalFuelGasCodeNFPA
54/ANSIZ223.1‐latesteditionandthe
requirementsofstateorlocalcodes.InCanada,
thefurnacesmustbeventedinaccordancewith
theNationalStandardofCanada,CAN/CSA
B149.1andCAN/CSAB149.2‐latesteditionsand
amendmentsandthecodesofthelocalutilityor
otherauthorityhavingjurisdiction.
□Allhorizontalventrunsmustbeslopedupaway
fromthewaterheateraminimumof1/4“(6mm)
perfoot.
□Verifythattheventterminationclearancesare
followed.
□Verifythatthereisadequatecombustionair.