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Operation & Installation Manual - Page 16

For EHFA400T48.

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Rinnai 16 HotoElectricStorageWaterHeaterOIM
Pressure and Temperature Relief (PTR) Valve
AcombinationPTRvalveissuppliedwiththewaterheater.ItisanimportantsafetydeviceandMUSTBEttedin
allinstallationsbeforethewaterheaterisoperated.
DONOTusethevalveifthesensingprobehasbeenbentoritisdamagedinsomeotherway.
ThePTRvalveistobescrewedtotheconnectionmarked“PTRValve”atthetopofthewaterheater.
ThethreadMUSTBEsealedwithanapprovedsealingtape.MakesurethesealingtapedoesNOThangover
theendofthethreadofthevalveasthismayblockthewaterwayandpreventthevalvefromoperatingproperly.
ToscrewthevalveintothewaterheaterconnectionuseawrenchonthespanneratsandNOTthevalvebody.
Leavethevalveoutletpointingdownwards.AcopperdrainpipeMUSTBEttedtothevalveoutletinaccordance
withthesection"ReliefValveDrainLines"onthebottomofpage16.
The valve body MUSTBEinsulated in accordance with local regulatory requirements andAS/NZS3500.4 to
optimiseperformanceandenergye󰀩ciency.InsulationMUSTBEappliedinamannerthatensuresitdoesNOT
interferewiththeoperationofthevalve.InsulationmaterialMUSTBEweatherproofandUVresistantifexposed.
Expansion Control Valve (ECV)
InareasofscalingwateranECVMUSTBEttedonthecoldwaterlinebetweenthenon-returnvalveandthe
connectiontothewaterheatertoprotectthePTRvalveandthewaterheater,asperthediagramsunder“Installation
Congurations”.ItMUSTBEthelastvalveonthecoldinletbeforethewaterheater.
LocalregulatoryauthoritiesmayrequirethatanECVbetted.TheECVistobesuppliedandttedbytheinstaller.
RefertothesectionWaterQualityformoreinformationonscalingwater.
AcopperdrainpipeMUSTBEttedtothevalveoutletinaccordancewiththesection"ReliefValveDrainLines"
onthebottomofpage16.
The valve body MUSTBEinsulatedin accordance with local regulatory requirements andAS/NZS3500.4 to
optimiseperformanceandenergye󰀩ciency.InsulationMUSTBEappliedinamannerthatensuresitdoesNOT
interferewiththeoperationofthevalve.InsulationmaterialMUSTBEweatherproofandUVresistantifexposed.
Pressure Limiting Valve (PLV)
APLVistobettedifthesupplypressureexceedsthelimitsshowninTable2“Ratings&OtherSpecications"
onpage11asperthediagramsunder“InstallationCongurations”.ThePLVistobesuppliedandttedbythe
installer.
Relief Valve Drain Lines
CopperdrainlinesofsizeDN15MUSTBEttedtotheECV(iftted)andthePTRvalve.Usedisconnectionunions
toconnectdrainlinestothevalves.
ThecongurationofdrainlinesMUSTBEinaccordancewithlocalregulatoryrequirementsandtherequirements
ofAS/NZS3500.4.
Thelengthshouldbeasshortaspossibleonacontinuousdownwardslopewithnorestrictions.Lengthshould
NOTexceed9metreswithnomorethanthree45°bends.Ifadrainlinedischargesintoatundish,thedrainline
fromthetundishMUSTNOTbelessthanDN20.ThedrainlinefromatundishMUSTmeetthesamerequirements
asdrainlinesfromreliefvalves.
Thedrain linesfrom the PTRvalve and ECV(if tted) froman individualwater heater maybe interconnected
subjecttolocalregulatoryauthorityrequirementsandAS/NZS3500.4.TheterminationpointMUSTalsocomply
withlocalregulatoryrequirementsandAS/NZS3500.4.DrainlinesMUSTNOTdischargeintoasafetray.
TheoutletofdrainlinesMUSTNOTbeobstructedandbepositionedsothattheyarereadilydiscerniblebutNOT
causeinjury,damageornuisance.
Inareaswherewaterpipesarepronetofreezing,drainlines MUSTBEinsulatedandNOTexceed300mmin
length.InthiscasethedrainlineMUSTdischargeintoatundishthroughanairgapofbetween75mmand150mm.
INSTALLATION
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