Rheem RH18537 Installation guide

Brand: Rheem

Model: RH18537

Type: Installation guide

Rheem RH18537 is a high-quality circulator pump designed to improve the efficiency and comfort of your home's hot water system. With its powerful motor and efficient design, the RH18537 quickly and effectively circulates hot water throughout your home, ensuring that you have instant access to hot water at every fixture. This not only saves you time and energy but also reduces water waste and the risk of scalding. The RH18537 is easy to install and maintain, making it a great choice for both new construction and retrofit projects.

001Ͳ4272  AP18531(10/16)

WaterRecirculationPipingDiagram(withDedicatedReturnLine)



NOTICE:Toconserveenergyandminimizeheatloss,insulationofhotwaterlinesisrecommended.

Linesshouldbecleanedandflushedbeforeinstallingpump.DONOTenergizepump untilproperlyinstalledand the

systemischeckedforleakandco mpletelyfilled.Pumpshouldbefloodedwithwaterbefore

itisstarted.

CAUTION:Avoidrunningcirculatorpumpdryasthiswilldamagethecirculatorpump.

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RheemPartNumber PumpConnection

Size

Motor

Voltage/Frequency/Phase RPM HP

AP18403 ½”maleNPT 115VAC/60Hz/1 3250 1/25

MaximumAllowableEquivalentPipeLength*

PipeDiameter(CopperPipe) 3/4” ½”

Maximumallowableequivalent

pipelength

400ft. 100ft.

*Equivalentpipelengthincludeshotwaterline,dedicatedreturnlineandallfittings.



WaterRecirculationPipingDiagram(UnderSinkApplication)

Pumpcanbeinstalledund ersink(furthestfixture)forretrofitapplicationsthatdoesnothavededicatedreturnlines.

Thiscanbedonebyusingappropriatefittings(notprovidedinthiskit).

CAUTION:Warmwatermaybepresentincoldwaterfixturesandcoldwaterlineduringpumpoperationand

shortperiod

thereafter,whenusingcoldwaterlineasareturnline.



NOTICE:Toconserveenergyandminimizeheatloss,insulationofhotwaterlinesisrecommended.



ActivationAccessories

RheemPart

Number

Description Whatitdoes

SP20861 Remotetransmitter,receiverkit Startsystemwithwirelessremotecontrol

SP20862 Motionsensorstarterkit Startsystemwithautomaticmotionsensor

SP20863 Individualstarterbutton  StartsystemwithhardͲwiredpushbutton

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NOTICE:Ifrequiredthelengthofthepushbuttonwirecanbeincreased.Extensionwirecanbeany18AGWwire

similartoathermostatwireandneednotbepolaritysensitive.Attachextensionwireusingappropriatewirenuts.It

isnotrecommendtohavethewiresexpos ed.



MaximumAllowableEquivalentPipeLength*

PipeDiameter(CopperPipe) 3/4” ½”

Maximumallowableequivalent

pipelength

400ft. 100ft.

*Equivalentpipelengthincludeshotwaterline,dedicatedreturnlineandallfittings.

Rheem RH18537 Installation guide

Rheem RH18537 Installation guide

Rheem RH18537 Installation guide

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