Rheem CRTGH-95X Series Use And Care Manual page 35

NOTICE:
Touse2-inchventpipe,areducing
adapterorbushingwillberequired.
WARNING:
TouseCategoryIIIStainlessSteel,apropertransition
partwillberequiredtopreventfluegasfromleaking.
Dependingonthesizeofpipethatischosenfor
ventingthewaterheater,itmightbenecessarytouse
afittingforsteppingdowninpipesize,toconnectto
thewaterheater.
Allintakeandexhaustventingcomponentsmusthave
thesamediametersize.Donotuseadifferentsizeon
theintakeandexhaustventing.
Theunitmaybeventedhorizontallythrougha
wallorverticallythroughtheroof.Piperunsmust
beadequatelysupportedalongbothverticaland
horizontalruns.Maximumunsupportedspanis
recommendedtobenomorethan4feet(1.2m).It
isimperativethatthefirsthangerbelocatedonthe
horizontalrunsimmediatelyadjacenttothefirst
90-degreeelbowfromtheverticalrise.Onlyuse
supportisolationhangingbands.DONOTusewireto
supportpiperuns.
Stresslevelsinthepipeandfittingscanbe
significantlyincreasedbyimproperinstallation.If
rigidpipeclampsareusedtoholdthepipeinplace,
orifthepipecannotmovefreelythroughawall
penetration,thepipemaybedirectlystressed,orhigh
thermalstressesmaybeformedwhenthepipeheats
upandexpands.Installaccordinglytominimizesuch
stresses.
PreexistingVentingNotes:
Ifthewaterheaterisbeinginstalledasareplacement
foranexistingwaterheater,athoroughinspection
oftheexistingventingandairintakesystemmustbe
performedpriortoanyinstallationwork.Verifythatthe
correctmaterials,ventlengths,andterminallocations
asdescribedinthismanualhavebeenmet.Carefully
inspecttheentireventingandairintakesystemforany
signsofcracksorfractures,particularlyatthejoints
betweenelbowsorotherfittingsandthestraightruns
ofventpipe.Checkthesystemforsignsofsaggingor
otherstressesinthejointsasaresultofmisalignment
INSTALLATION INSTRUCTIONS
ofanycomponentsinthesystem.Ifanyofthese
conditionsarefound,theymustbecorrectedin
accordancewiththeventinginstructionsinthismanual
beforecompletingtheinstallationandputtingthewater
heaterintoservice.
NOTICES:
• I tisrecommendedthattheairintakeandexhaust
pipeshavea1/4"perfootdownwardslopetoward
theoutdoors.
• M aintaintheproperclearancebetweentheventpipe
andcombustibleornoncombustiblematerialsare
describedonpages28,29.
• A zeroclearance0in.(0cm)isallowedbetweenthe
airintakepipesandcombustiblematerial.
• U sepropersupportfortheventandairintakepipes.
• I tisrecommendedthesupportmethodusedisolates
theventpipefromfloorjoistsorotherstructural
members.Thishelpspreventtransmissionofnoise
andvibration.
• D onotsupport,pin,orotherwisesecuretheventing
systeminawaythatrestrictsthenormalthermal
expansionandcontractionofthechosenventing
material.
Seepage36foradditionalrequirementsforthe
CommonwealthofMassachusetts.
35