Rheem H95 Direct Vent Indoor Series Use and Care Manual - Page 34

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INSTALLATION INSTRUCTIONS Venting VentingforDirect-VentWaterHeater DANGER:Failuretoproperlyventthewater heatertotheoutdoorsasoutlinedinthisVenting sectionwillresultindeathorseriouspersonalinjury. Toavoidtheriskoffire,explosion,orasphyxiation fromcarbonmonoxide,NEVERoperatethewater heaterunlessitisproperlyventedandhasadequate airsupplyforproperoperationasoutlinedinthis Ventingsection.Thiswaterheatermusthaveair supplyconnectedandterminatedtotheoutdoors. WARNING: Refertopage29forrequiredclearancesto combustiblematerials.Improperclearancescancause explosionorfireresultingindeath,personalinjury, and/orproductdamage. CAUTIONS: •Checktomakesurefluegasesdonotrecirculateinto theairintaketerminalwhenusingdirectventing.Ifthe waterheaterishavingserviceissues,fluerecirculation maybeacontributingfactor. •Evenwhentheminimumventterminalseparation distancesarefollowed,recirculationmaystilloccur dependinguponthelocationoutsidethebuilding, thedistancefromotherbuildings,proximityto corners,weatherconditions,windpatterns,and snowdepth. •Periodicallychecktomakesurethatflue recirculationisnotoccurring.Signsoffluegas recirculationincludefrostedorfrozenintake terminalsandcondensateintheintaketerminaland ventingsystem. •Correctiontofluerecirculationmayinvolveangling theintakeawayfromtheexhaustterminaland increasingthedistancebetweenthem.Checkto besuretheintakeandexhaustterminalsarenot obstructed,especiallyduringperiodsofbelowfreezingweather. VentingRequirements The installationofventingmustcomplywithnational codes,localcodes,andtheventmanufacturer's instructions. Theventexhaustandairintakemustterminateoutside asdescribedintheseinstructions.DONOTventthis waterheaterthroughachimney.Itmustbevented separatelyfromallotherappliances. NOTICE:Theunitcanbeventedusingonlythe followingapprovedventpipematerial. Useonly2-or3-inchdiameterpipe.Refertolocalcodes forrestrictionsontheuseofPVC,CPVC,orABSpipe andfittings.Allexhaustventingmaterialsforproduct installedinCanadamustmeetULC-S636. 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 MaximumLength 90°Elbows of2"StraightPipe of3"StraightPipe 1 5.0ft.(1.5m) 38.0ft.(11.6m) 2 3.5ft.(1.0m) 36.5ft.(11.1m) 3 2.0ft.(0.6m) 35.0ft.(10.6m) 4 Notavailable 33.5ft.(10.2m) 5 Notavailable 32.0ft.(9.8m) 6 Notavailable 30.5ft.(9.3m) 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 MinimumLength 90°Elbows of2"StraightPipe of3"StraightPipe 1 1.0ft.(0.3m) 1.0ft.(0.3m) 34

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34
INSTALLATION INSTRUCTIONS
Venting±for±Direct-Vent±Water±Heater
DANGER:
±Failure±to±properly±vent±the±water±
heater±to±the±outdoors±as±outlined±in±this±Venting±
section±will±result±in±death±or±serious±personal±injury.±
To±avoid±the±risk±of±fire,±explosion,±or±asphyxiation±
from±carbon±monoxide,±NEVER±operate±the±water±
heater±unless±it±is±properly±vented±and±has±adequate±
air±supply±for±proper±operation±as±outlined±in±this±
Venting±section.±±This±water±heater±must±have±air±
supply±connected±and±terminated±to±the±outdoors.
WARNING:±
Refer±to±page±29±for±required±clearances±to±
combustible±materials.±Improper±clearances±can±cause±
explosion±or±fire±resulting±in±death,±personal±injury,±
and/or±product±damage.
CAUTIONS:
±
•±±
Check±to±make±sure±flue±gases±do±not±recirculate±into±
the±air±intake±terminal±when±using±direct±venting.±If±the±
water±heater±is±having±service±issues,±flue±recirculation±
may±be±a±contributing±factor.±
•±±
Even±when±the±minimum±vent±terminal±separation±
distances±are±followed,±recirculation±may±still±occur±
depending±upon±the±location±outside±the±building,±
the±distance±from±other±buildings,±proximity±to±
corners,±weather±conditions,±wind±patterns,±and±
snow±depth.±
•±±
Periodically±check±to±make±sure±that±flue±
recirculation±is±not±occurring.±Signs±of±flue±gas±
recirculation±include±frosted±or±frozen±intake±
terminals±and±condensate±in±the±intake±terminal±and±
venting±system.±
•±±
Correction±to±flue±recirculation±may±involve±angling±
the±intake±away±from±the±exhaust±terminal±and±
increasing±the±distance±between±them.±Check±to±
be±sure±the±intake±and±exhaust±terminals±are±not±
obstructed,±especially±during±periods±of±below-
freezing±weather.
Venting±Requirements
The installation±of±venting±must±comply±with±national±
codes,±local±codes,±and±the±vent±manufacturer’s±
instructions.
The±vent±exhaust±and±air±intake±must±terminate±outside±
as±described±in±these±instructions.±DO±NOT±vent±this±
water±heater±through±a±chimney.±It±must±be±vented±
separately±from±all±other±appliances.
NOTICE:
±The±unit±can±be±vented±using±only±the±
following±approved±vent±pipe±material.±
Use±only±2-±or±3-inch±diameter±pipe.±Refer±to±local±codes±
for±restrictions±on±the±use±of±PVC,±CPVC,±or±ABS±pipe±
and±fittings.±All±exhaust±venting±materials±for±product±
installed±in±Canada±must±meet±ULC-S636.
±
Acceptable±materials±or±equivalent:
PVC±(Schedule±40,±ASTM±D-1785)
CPVC±(Schedule±40,±ASTM±F-441)
ABS±(Schedule±40,±ASTM±D-2661)±
(not±permitted±for±exhaust±vent±in±Canada)
The±fittings,±other±than±the±VENT±TERMINAL,±
should±be±equivalent±to±the±following:
PVC±(Schedule±40±DWV,±ASTM±D-2665)
CPVC±(Schedule±40±DWV,±ASTM±F-438)
ABS±(Schedule±40±DWV,±ASTM±D-2661)±
(Not±permitted±in±Canada)
Category±III±Stainless±Steel±(Proper±transition±part±
required)
DO±NOT±USE±Schedule±20,±Cell±Core,±Drain±Pipe,±
Galvanized,±Aluminum,±or±B-Vent.
Recommended±Vent±Lengths
Before±starting±the±vent±installation,±careful±planning±
should±be±given±to±the±routing±and±termination±of±the±
vent±pipes.±The±length±of±the±vent±pipes±(inlet±and±
outlet)±should±be±kept±to±a±minimum.±Also,±see±pages±
37–38±and±44±for±vent±terminal±placement.±Refer±to±the±
maximum±and±minimum±vent±length±charts±for±the±pipe±
sizes±that±can±be±used±and±the±total±equivalent±length±
of±pipe±that±can±be±used.±Do±not±exceed±equivalent±
length±of±pipe±in±maximum±vent±length±chart.
Maximum±Vent±Length±(intake/outlet):
Number±of±
90°±Elbows
Maximum±Length±
of±2"±Straight±Pipe
Maximum±Length±
of±3"±Straight±Pipe
1
5.0±ft.±(1.5±m)
38.0±ft.±(11.6±m)
2
3.5±ft.±(1.0±m)
36.5±ft.±(11.1±m)
3
2.0±ft.±(0.6±m)
35.0±ft.±(10.6±m)
4
Not±available
33.5±ft.±(10.2±m)
5
Not±available
32.0±ft.±(9.8±m)
6
Not±available
30.5±ft.±(9.3±m)
The±system±will±not±operate±if±there±is±excessive±
restriction±(pressure±drop)±in±the±venting±system.±Use±
the±chart±above±to±calculate±the±maximum±pipe±run±
length±with±the±required±number±of±elbows±(e.g.,±a±
maximum±38±ft.±[12±m]±of±3"±vent±pipe±may±be±used±
provided±there±is±only±one±90°±elbow±in±the±system).
A±90°±elbow±is±equivalent±to±1±ft.±6±in.±(0.5±m)±of±
straight±pipe.±±A±45°±elbow±is±equivalent±to±9”±(0.25±m)±
of±straight±pipe.
The±vent±termination±does±not±count±as±part±of±the±
straight±pipe±equivalent±when±determining±the±total±
vent±length.±
Minimum±Vent±Length:
Number±of±
90°±Elbows
Minimum±Length±
of±2"±Straight±Pipe
Minimum±Length±
of±3"±Straight±Pipe
1
1.0±ft.±(0.3±m)
1.0±ft.±(0.3±m)
Venting