15
Thetemperature- pressure relief valve mu st be manually
oper ated atlea ston ceay ear,s eeFi gure 28.C autio nsho uldb e
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no tcauseanybodilyinjury
orpropertydamagebecausethewaterm ay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altitud es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.