A.O. Smith 197835-001 Water Heater User Manual


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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.
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