Rheem H95 Direct Vent Indoor Series Use and Care Manual - Page 47

Thermal Expansion, Water Supply Connections

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Plumbing INSTALLATION INSTRUCTIONS WaterSupply CAUTION:ThiswaterheaterMUSTONLY beusedwiththefollowingwatersupplyconditionsto preventproductdamageandoperationfailure. •Clean,potablewaterfreeofcorrosivechemicals, sand,dirt,orothercontaminates. •Inletwatertemperaturesabove32°F(0°C),butnot exceeding120°F(49°C). •DONOTreversetheHOTandCOLDwaterconnections. •DONOTconnectthiswaterheatertowaterlines previouslyusedforspaceheating.Allwaterpiping andcomponentsshallbesuitableforpotablewater. •Withrecommendedwaterquality(seechart). Thermal Expansion Athermalexpansiontankwillberequiredifthewater heaterisinstalledinarecirculationsystem.This preventsdamagetotheheater,relatedpiping,andthe reliefvalve. NOTICE:Replacingthereliefvalvewillnot correcttheproblem! Theexpansiontankisdesignedwithabuilt-inair cushionthatcompressesasthesystempressure increases.Thisrelievestheover-pressurecondition andeliminatestherepeatoperationofthereliefvalve. Forotherapprovedmethodsofthermalexpansion, contactaninstallingcontractor,watersupplier,or plumbinginspector. pH TDS(Total DissolvedSolids) 6.5-8.5 Upto500mg/L ChartforRecommendedWaterQualityLevels FreeCarbon Dioxide(CO2) Upto15mg/L Total Hardness Upto 200mg/L Aluminum Chlorides Upto 0.2mg/L Upto 200mg/L Copper Upto 1.0mg/L Iron Upto 0.3mg/L Manganese Upto 0.05mg/L Zinc Upto 1.0mg/L Water Supply Connections CAUTION:IMPORTANT-Donotapply heattotheHOTorCOLDwaterconnections.Ifsweat connectionsareused,sweattubingtotheadapter beforefittingtheadaptertothewaterconnections onthewaterheater.Anyheatappliedtothewater supplyfittingswillpermanentlydamagetheinternal componentsofthewaterheater. NOTICE:Incoldenvironments,icecan accumulateinthewaterheater'sconnectors.Plug inthewaterheaterpowercordforapproximately10 minutesbeforemakingtheseconnections.Thiswill meltanyicebuildup. Plumbingshouldbecarriedoutbyaqualifiedplumbing contractorinaccordancewithlocalcodes. Onlyuseapprovedplumbingmaterials. Toallowthefullflowcapacity,itisrecommended tokeepwaterinletandoutletpipes3/4"(1.9cm) diameterorlarger. Toconserveenergyandtopreventfreezing,insulate bothCOLDandHOTwatersupplylines.Donotinsulate thedrainlineorpressure-reliefvalve. 47

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47
INSTALLATION INSTRUCTIONS
CAUTION:
±This±water±heater±MUST±ONLY±
be±used±with±the±following±water±supply±conditions±to±
prevent±product±damage±and±operation±failure.
•±±
Clean,±potable±water±free±of±corrosive±chemicals,±
sand,±dirt,±or±other±contaminates.
•±±
Inlet±water±temperatures±above±32°F±(0°C),±but±not±
exceeding±120°F±(49°C).
•±±
DO±NOT±reverse±the±HOT±and±COLD±water±connections.
•±±
DO±NOT±connect±this±water±heater±to±water±lines±
previously±used±for±space±heating.±All±water±piping±
and±components±shall±be±suitable±for±potable±water.
•±±
With±recommended±water±quality±(see±chart).
Thermal Expansion
A±thermal±expansion±tank±will±be±required±if±the±water±
heater±is±installed±in±a±recirculation±system.±This±
prevents±damage±to±the±heater,±related±piping,±and±the±
relief±valve.±
NOTICE:
±Replacing±the±relief±valve±will±not±
correct±the±problem!±
The±expansion±tank±is±designed±with±a±built-in±air±
cushion±that±compresses±as±the±system±pressure±
increases.±This±relieves±the±over-pressure±condition±
and±eliminates±the±repeat±operation±of±the±relief±valve.
For±other±approved±methods±of±thermal±expansion,±
contact±an±installing±contractor,±water±supplier,±or±
plumbing±inspector.
Water Supply Connections
CAUTION:
±IMPORTANT—Do±not±apply±
heat±to±the±HOT±or±COLD±water±connections.±If±sweat±
connections±are±used,±sweat±tubing±to±the±adapter±
before±fitting±the±adapter±to±the±water±connections±
on±the±water±heater.±Any±heat±applied±to±the±water±
supply±fittings±will±permanently±damage±the±internal±
components±of±the±water±heater.
NOTICE:
±In±cold±environments,±ice±can±
accumulate±in±the±water±heater’s±connectors.±Plug±
in±the±water±heater±power±cord±for±approximately±10±
minutes±before±making±these±connections.±This±will±
melt±any±ice±buildup.±
Plumbing±should±be±carried±out±by±a±qualified±plumbing±
contractor±in±accordance±with±local±codes.
Only±use±approved±plumbing±materials.
To±allow±the±full±flow±capacity,±it±is±recommended±
to±keep±water±inlet±and±outlet±pipes±3/4"±(1.9±cm)±
diameter±or±larger.±
To±conserve±energy±and±to±prevent±freezing,±insulate±
both±COLD±and±HOT±water±supply±lines.±Do±not±insulate±
the±drain±line±or±pressure-relief±valve.
Chart±for±Recommended±Water±Quality±Levels
pH
TDS±(Total±±
Dissolved±Solids)
Free±Carbon±
Dioxide±(CO
2
)
Total±±
Hardness
Aluminum
Chlorides
Copper
Iron
Manganese
Zinc
6.5–8.5
Up±to±500±mg/L
Up±to±15±mg/L
Up±to±±
200±mg/L
Up±to±±
0.2±mg/L
Up±to±±
200±mg/L
Up±to±±
1.0±mg/L
Up±to±±
0.3±mg/L
Up±to±±
0.05±mg/L
Up±to±±
1.0±mg/L
Water±Supply
Plumbing