Rheem H95 Direct Vent Indoor Series Use and Care Manual - Page 35

Notice, Warning, Notices

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Venting INSTALLATION INSTRUCTIONS 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. ofanycomponentsinthesystem.Ifanyofthese conditionsarefound,theymustbecorrectedin accordancewiththeventinginstructionsinthismanual beforecompletingtheinstallationandputtingthewater heaterintoservice. NOTICES: •Itisrecommendedthattheairintakeandexhaust pipeshavea1/4"perfootdownwardslopetoward theoutdoors. •Maintaintheproperclearancebetweentheventpipe andcombustibleornoncombustiblematerialsare describedonpages28,29. •Azeroclearance0in.(0cm)isallowedbetweenthe airintakepipesandcombustiblematerial. •Usepropersupportfortheventandairintakepipes. •Itisrecommendedthesupportmethodusedisolates theventpipefromfloorjoistsorotherstructural members.Thishelpspreventtransmissionofnoise andvibration. •Donotsupport,pin,orotherwisesecuretheventing systeminawaythatrestrictsthenormalthermal expansionandcontractionofthechosenventing material. Seepage36foradditionalrequirementsforthe CommonwealthofMassachusetts. 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 35

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35
INSTALLATION INSTRUCTIONS
Venting
NOTICE:
±To±use±2-inch±vent±pipe,±a±reducing±
adapter±or±bushing±will±be±required.
WARNING:
To±use±Category±III±Stainless±Steel,±a±proper±transition±
part±will±be±required±to±prevent±flue±gas±from±leaking.
Depending±on±the±size±of±pipe±that±is±chosen±for±
venting±the±water±heater,±it±might±be±necessary±to±use±
a±fitting±for±stepping±down±in±pipe±size,±to±connect±to±
the±water±heater.
All±intake±and±exhaust±venting±components±must±have±
the±same±diameter±size.±Do±not±use±a±different±size±on±
the±intake±and±exhaust±venting.
The±unit±may±be±vented±horizontally±through±a±
wall±or±vertically±through±the±roof.±Pipe±runs±must±
be±adequately±supported±along±both±vertical±and±
horizontal±runs.±Maximum±unsupported±span±is±
recommended±to±be±no±more±than±4±feet±(1.2±m).±It±
is±imperative±that±the±first±hanger±be±located±on±the±
horizontal±runs±immediately±adjacent±to±the±first±
90-degree±elbow±from±the±vertical±rise.±Only±use±
support±isolation±hanging±bands.±DO±NOT±use±wire±to±
support±pipe±runs.
Stress±levels±in±the±pipe±and±fittings±can±be±
significantly±increased±by±improper±installation.±If±
rigid±pipe±clamps±are±used±to±hold±the±pipe±in±place,±
or±if±the±pipe±cannot±move±freely±through±a±wall±
penetration,±the±pipe±may±be±directly±stressed,±or±high±
thermal±stresses±may±be±formed±when±the±pipe±heats±
up±and±expands.±Install±accordingly±to±minimize±such±
stresses.±
Preexisting±Venting±Notes:
If±the±water±heater±is±being±installed±as±a±replacement±
for±an±existing±water±heater,±a±thorough±inspection±
of±the±existing±venting±and±air±intake±system±must±be±
performed±prior±to±any±installation±work.±Verify±that±the±
correct±materials,±vent±lengths,±and±terminal±locations±
as±described±in±this±manual±have±been±met.±Carefully±
inspect±the±entire±venting±and±air±intake±system±for±any±
signs±of±cracks±or±fractures,±particularly±at±the±joints±
between±elbows±or±other±fittings±and±the±straight±runs±
of±vent±pipe.±Check±the±system±for±signs±of±sagging±or±
other±stresses±in±the±joints±as±a±result±of±misalignment±
of±any±components±in±the±system.±If±any±of±these±
conditions±are±found,±they±must±be±corrected±in±
accordance±with±the±venting±instructions±in±this±manual±
before±completing±the±installation±and±putting±the±water±
heater±into±service.
NOTICES:
•±±
It±is±recommended±that±the±air±intake±and±exhaust±
pipes±have±a±1/4"±per±foot±downward±slope±toward±
the±outdoors.±
•±±
Maintain±the±proper±clearance±between±the±vent±pipe±
and±combustible±or±noncombustible±materials±are±
described±on±pages±28,±29.
•±±
A±zero±clearance±±0±in.(0cm)±is±allowed±between±the±
air±intake±pipes±and±combustible±material.
•±±
Use±proper±support±for±the±vent±and±air±intake±pipes.
•±±
It±is±recommended±the±support±method±used±isolates±
the±vent±pipe±from±floor±joists±or±other±structural±
members.±This±helps±prevent±transmission±of±noise±
and±vibration.
•±±
Do±not±support,±pin,±or±otherwise±secure±the±venting±
system±in±a±way±that±restricts±the±normal±thermal±
expansion±and±contraction±of±the±chosen±venting±
material.
See±page±36±for±additional±requirements±for±the±
Commonwealth±of±Massachusetts.