Rheem H95 Direct Vent Indoor Series Use and Care Manual - Page 48

Water Supply Installation, Water Supply Connections cont.

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Plumbing INSTALLATION INSTRUCTIONS WaterSupply Water Supply Connections (cont.) Toensureproperoperationofthewaterheater,follow thesewaterpressureguidelines. •Operationofthewaterheaterrequiresaminimum waterpressureof14psi(97kPa)andaminimum waterflowrateof0.4gpm(1.5lpm). •Waterpressureof40psi(276kPa)isrequiredto achievemaximumflowrate. •Tomaintainproperperformance,theremustbe sufficientwatersupplypressure. RequiredWaterPressure= Min.OperatingWaterPressure (14psi[97kPa]) +PipePressureLoss +FaucetPressureLoss +SafetyMargin (morethan5psi[34kPa]). •TosupplyHOTwatertoupperfloors,additionalwater pressurewillberequired(0.44psi[3kPa] perfootofheight).Calculatethedistancebetween thewaterinletofthewaterheater(groundlevel)to theHOTwaterfaucetfarthestawayfromthewater heater(upperfloorlevel). •Wellwatersystemsshouldbesettoensurea minimumsystempressureof40psi(276kPa).The pressureshouldremainconstantandstableduring theoperationofthewaterheater. •Gravitywaterpressureisnotrecommended.When thewaterissuppliedfromawatersupplytank,the heightofthetank,thediameterofthesupplypipes, andtheirrelationtowaterpressureneedtobetaken intoconsideration. Water Supply Installation NOTICES: •UseonlyTeflontapeonallCOLDandHOTwater connections. •Ifthewaterflowresistanceofashowerheadis toohigh,theburnerinthewaterheaterwillfailto ignite.Keepallshowerheadscleanfromdebristhat couldcauseadditionalpressuredrop. •Ifusingmixingvalvesontheoutlet,chooseonethat preventsCOLDwaterpressurefromovercomingHOT waterpressure. •Ifmultiplewaterheatersareinstalledinamanifold system,thewaterpipingMUSTbein"parallel"and thewaterpressureateachwaterheatershouldbe40 psi(276kPa). 2  Beforeattachingthewaterlinetothewaterheater, opentheshut-offvalve.Runthewateruntilit haspurgedallcontaminants(sand,debris,air, caulking,etc.). 3  InstallaservicevalveontheendoftheCOLDwater 1 supplylineandconnectittothewaterinletonthe waterheater.  InstallaCOLDwatershut-offvalveneartheinlet lineonthewaterheater.Thisvalvewillbeusedfor servicinganddrainingpurposes. NOTICE:  Itisnotrecommendedtousepipes withsmallerdiametersthanthewatersupply connectionofthewaterheater. 48

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48
Plumbing
INSTALLATION INSTRUCTIONS
Water±Supply
Water Supply Installation
NOTICES:±
•±±
Use±only±Teflon±tape±on±all±COLD±and±HOT±water±
connections.
•±±
If±the±water±flow±resistance±of±a±showerhead±is±
too±high,±the±burner±in±the±water±heater±will±fail±to±
ignite.±Keep±all±showerheads±clean±from±debris±that±
could±cause±additional±pressure±drop.
•±±
If±using±mixing±valves±on±the±outlet,±choose±one±that±
prevents±COLD±water±pressure±from±overcoming±HOT±
water±pressure.±
•±±
If±multiple±water±heaters±are±installed±in±a±manifold±
system,±the±water±piping±MUST±be±in±“parallel”±and±
the±water±pressure±at±each±water±heater±should±be±40±
psi±(276±kPa).
±
Install±a±COLD±water±shut-off±valve±near±the±inlet±
line±on±the±water±heater.±This±valve±will±be±used±for±
servicing±and±draining±purposes.
±
NOTICE:
±It±is±not±recommended±to±use±pipes±
with±smaller±diameters±than±the±water±supply±
connection±of±the±water±heater.
±
Before±attaching±the±water±line±to±the±water±heater,±
open±the±shut-off±valve.±Run±the±water±until±it±
has±purged±all±contaminants±(sand,±debris,±air,±
caulking,±etc.).
±
Install±a±service±valve±on±the±end±of±the±COLD±water±
supply±line±and±connect±it±to±the±water±inlet±on±the±
water±heater.±
To±ensure±proper±operation±of±the±water±heater,±follow±
these±water±pressure±guidelines.
•±±
Operation±of±the±water±heater±requires±a±minimum±
water±pressure±of±14±psi±(97±kPa)±and±a±minimum±
water±flow±rate±of±0.4±gpm±(1.5±lpm).
•±±
Water±pressure±of±40±psi±(276±kPa)±is±required±to±
achieve±maximum±flow±rate.
•±±
To±maintain±proper±performance,±there±must±be±
sufficient±water±supply±pressure.±
Required±Water±Pressure±=±
Min.±Operating±Water±Pressure±±±±
±(14±psi±[97±kPa])±±±±
+±Pipe±Pressure±Loss
+±Faucet±Pressure±Loss
±+±Safety±Margin±±
(more±than±5±psi±[34±kPa]).±±
•±±
To±supply±HOT±water±to±upper±floors,±additional±water±
pressure±will±be±required±(0.44±psi±[3±kPa]±±
per±foot±of±height).±Calculate±the±distance±between±
the±water±inlet±of±the±water±heater±(ground±level)±to±
the±HOT±water±faucet±farthest±away±from±the±water±
heater±(upper±floor±level).
•±±
Well±water±systems±should±be±set±to±ensure±a±
minimum±system±pressure±of±40±psi±(276±kPa).±The±
pressure±should±remain±constant±and±stable±during±
the±operation±of±the±water±heater.
•±±
Gravity±water±pressure±is±not±recommended.±When±
the±water±is±supplied±from±a±water±supply±tank,±the±
height±of±the±tank,±the±diameter±of±the±supply±pipes,±
and±their±relation±to±water±pressure±need±to±be±taken±
into±consideration.±
1
Water Supply Connections (cont.)
2
3