Venting - Rheem CRTGH-95X Series Use And Care Manual

INSTALLATION INSTRUCTIONS
VentingforDirect-VentWaterHeater
DANGER:
heatertotheoutdoorsasoutlinedinthisVenting
sectionwillresultindeathorseriouspersonalinjury.
Toavoidtheriskoffire,explosion,orasphyxiation
fromcarbonmonoxide,NEVERoperatethewater
heaterunlessitisproperlyventedandhasadequate
airsupplyforproperoperationasoutlinedinthis
Ventingsection.Thiswaterheatermusthaveair
supplyconnectedandterminatedtotheoutdoors.
WARNING:
Refertopage29forrequiredclearancesto
combustiblematerials.Improperclearancescancause
explosionorfireresultingindeath,personalinjury,
and/orproductdamage.
CAUTIONS:
• C hecktomakesurefluegasesdonotrecirculateinto
theairintaketerminalwhenusingdirectventing.Ifthe
waterheaterishavingserviceissues,fluerecirculation
maybeacontributingfactor.
• E venwhentheminimumventterminalseparation
distancesarefollowed,recirculationmaystilloccur
dependinguponthelocationoutsidethebuilding,
thedistancefromotherbuildings,proximityto
corners,weatherconditions,windpatterns,and
snowdepth.
• P eriodicallychecktomakesurethatflue
recirculationisnotoccurring.Signsoffluegas
recirculationincludefrostedorfrozenintake
terminalsandcondensateintheintaketerminaland
ventingsystem.
• C orrectiontofluerecirculationmayinvolveangling
theintakeawayfromtheexhaustterminaland
increasingthedistancebetweenthem.Checkto
besuretheintakeandexhaustterminalsarenot
obstructed,especiallyduringperiodsofbelow-
freezingweather.
VentingRequirements
The installationofventingmustcomplywithnational
codes,localcodes,andtheventmanufacturer's
instructions.
Theventexhaustandairintakemustterminateoutside
asdescribedintheseinstructions.DONOTventthis
waterheaterthroughachimney.Itmustbevented
separatelyfromallotherappliances.
NOTICE:
followingapprovedventpipematerial.
Useonly2-or3-inchdiameterpipe.Refertolocalcodes
forrestrictionsontheuseofPVC,CPVC,orABSpipe
andfittings.Allexhaustventingmaterialsforproduct
installedinCanadamustmeetULC-S636.
34
Failuretoproperlyventthewater

Theunitcanbeventedusingonlythe
Acceptablematerialsorequivalent:
PVC(Schedule40,ASTMD-1785)
CPVC(Schedule40,ASTMF-441)
ABS(Schedule40,ASTMD-2661)
(notpermittedforexhaustventinCanada)
Thefittings,otherthantheVENTTERMINAL,
shouldbeequivalenttothefollowing:
PVC(Schedule40DWV,ASTMD-2665)
CPVC(Schedule40DWV,ASTMF-438)
ABS(Schedule40DWV,ASTMD-2661)
(NotpermittedinCanada)
CategoryIIIStainlessSteel(Propertransitionpart
required)
DONOTUSESchedule20,CellCore,DrainPipe,
Galvanized,Aluminum,orB-Vent.
RecommendedVentLengths
Beforestartingtheventinstallation,carefulplanning
shouldbegiventotheroutingandterminationofthe
ventpipes.Thelengthoftheventpipes(inletand
outlet)shouldbekepttoaminimum.Also,seepages
37–38and44forventterminalplacement.Refertothe
maximumandminimumventlengthchartsforthepipe
sizesthatcanbeusedandthetotalequivalentlength
ofpipethatcanbeused.Donotexceedequivalent
lengthofpipeinmaximumventlengthchart.
MaximumVentLength(intake/outlet):
Numberof MaximumLength
90°Elbows of2"StraightPipe
1 5.0ft.(1.5m)
2 3.5ft.(1.0m)
3 2.0ft.(0.6m)
4 Notavailable
5 Notavailable
6 Notavailable
Thesystemwillnotoperateifthereisexcessive
restriction(pressuredrop)intheventingsystem.Use
thechartabovetocalculatethemaximumpiperun
lengthwiththerequirednumberofelbows(e.g.,a
maximum38ft.[12m]of3"ventpipemaybeused
providedthereisonlyone90°elbowinthesystem).
A90°elbowisequivalentto1ft.6in.(0.5m)of
straightpipe.A45°elbowisequivalentto9"(0.25m)
ofstraightpipe.
Theventterminationdoesnotcountaspartofthe
straightpipeequivalentwhendeterminingthetotal
ventlength.
MinimumVentLength:
Numberof MinimumLength
90°Elbows of2"StraightPipe
1 1.0ft.(0.3m)
MaximumLength
of3"StraightPipe
38.0ft.(11.6m)
36.5ft.(11.1m)
35.0ft.(10.6m)
33.5ft.(10.2m)
32.0ft.(9.8m)
30.5ft.(9.3m)
MinimumLength
of3"StraightPipe
1.0ft.(0.3m)