Instructions for Installation (cont'd)
Temperature-Pressure Relief Valve
_WARNING _,WARNING I
At thetimeof manufacturethiswater heaterwasprovid- The temperature-pressurerelief valve mustbe manu-
edwith a combinationtemperature-pressuresreliefvalve ally operatedat leastoncea year,Cautionshouldbe
certifiedbyanationallyrecoclnizedtestinglaboratorythat taken to ensure that (1) no one is in front of or
maintainsperiodicinspectionof productionof listed around the outlet of the temperature-pressurerelief
equipmentor materials,as meetingthe requirementsfor valvedischargeline, and (2) the water manually dis- I
ReliefValvesandAutomaticGasShutoffDevicesfor Hot
chargedwill not causeany bodilyinjury or property
Water SupplySystems,andthe currenteditionof ANSI damagebecausethewater may beextremely hot.
Z21.22andthe coderequirementsof ASME.If replaced, If after manuallyoperatingthe valve, it fails to corn-
the valvemustmeetthe requirementsof localcodes,but pletely reset and continuesto releasewater, immedi-
not lessthan a combinationtemperatureand pressure ately closethe coldwater inlet to the water heater,
relief valvecertified as meetingthe requirementsfor follow the draining instructions, and replace the
ReliefValvesandAutomaticGasShutoffDevicesfor Hot temperature-pressurereliefvalvewith a new one.
WaterSupplySystems,ANSIZ21.22byanationallyrecog-
nizedtestinglaboratorythat maintainsperiodicinspection
ofproductionoflistedequipmentormaterials.
Thevalvemustbe markedwith a maximumset pressure SHUTOFF
nottoexceedthe markedhydrostaticworkingpressureof VALVE
thewater heater(150Ibs./sq.in.)anda dischargecapacity _-'_'_ _l-_
notlessthanthewater heaterinputrateasshownonthe
modelratingplate. (Electricheaters- watts dividedby _ F-_]11_ _C:_
1000x3415equalBTU/Hr.rate.) HOT COLD
Your local jurisdictional authority, while mandating the
use of a temperature-pressure relief valve complying with
ANSIZ21.22andASME,mayrequirea valvemodeldiffer- ,f ,"x
ent fromtheonefurnishedwiththewaterheater. [ ,
Compliancewith suchlocalrequirementsmustbesatisfied
bythe installeror end userof the water heaterwith a _
locally prescribedtemperature-pressure relief valve |
installedinthedesignatedopeninginthewater heaterin
placeofthefactoryfurnishedva{ve.
Forsafeoperationof the water heater,the relief valve _ TEMPERATURE-
I rl\ PRESSURE
plugged.mustn°tberem°vedfrom it's designatedopeningor II1"_ RELIEFVALVE
The temperature-pressure relief valve must be installed
directly into the fitting of the water heater designated for DISCHARGEPIPE
cap
thereliefvalve.Positionthevalvedownwardandprovide ,orplug)
tubingsothatanydischargewillexitonlywithin6 inches r_l
above,or at anydistancebelowthe structuralfloor.Be
certainthat no contactis madewith any live electrical
part. The dischargeopening mustnot be blockedor
reducedinsizeunderanycircumstances.Excessivelength,
over30 feet, or useof morethan fourelbowscancause
restrictionandreducethedischargecapacityof thevalve.
Novalveorotherobstructionisto be placedbetweenthe
reliefvalveandthetank.Donotconnecttubingdirectlyto
dischargedrainunlessa 6" airgapisprovided.Toprevent
bodilyinjury,hazardto life,or propertydamage,the relief
valvemustbe allowedto dischargewater in quantities
shouldcircumstancesdemand.Ifthe dischargepipeisnot FLOORDRAIN
connectedto a drainor othersuitablemeans,the water
Y_
flow maycausepropertydamage.
TheDischargePipe: RELIEF VALVE OPENING
• Mustnotbe smallerin sizethanthe outletpipesizeof
the valve, or have any reducing couplings or other Atthetimeof manufacture,thiswaterheaterwasprovidedwithacombination
temperature-pressurereliefvalvelistedascomplyingwiththestandardforrelief
restrictions, valves and automatic gas shut-off devices for hot water supply systems, ANSI
Must not be plugged or blocked. Z21.22. For safe operation of the water heater, the relief valve must not be
: Mustbeofmateriallistedfor hot waterdistribution.
removed from itsdesignated point of installation or plugged,
• Must be installedsoasto allowcompletedrainageof Yourlocalurisdictionalauthority,whilemandatingtheuseofatemperature-
pressurereliefvalvecomplyingwithANSIZ21.22andASME,mayrequireavalve
both the temperature-pressure relief valve, andthe dis- model different from the one furnished with the water heate_
chargepipe. Compliance with such 10cal requirements must be satisfied by the installer or
• Must terminate at an adequate drain, end user of the water heater with a locally prescribed temperature-pressure
• Must not have any valve between the relief valve and reliefvalveinstalledinthedesignatedopeninginthewaterheater.
See manual heading J'Temperature-Pressure Relief Valves" for installation and
tank. maintenance of relief valve, discharge line, and other safety precautions.
17