WIXLIB

Installing the water heaterThermal ExpansionDetermine if a check valve exists in theinlet water line. Check with your localwater utility. It may have been installed inthe cold water line as a separate back flowpreventer, or it may be part of a pressurereducing valve, water meter or water softener.A check valve located in the cold water inletline can cause what is referred to as a “closedwater system”. A cold water inlet line withno check valve or back flow preventiondevice is referred to as an “open” watersystem.As water is heated, it expands in volume andcreates an increase in the pressure within thewater system. This action is referred to as“thermal expansion”. In an “open” watersystem, expanding water which exceeds thecapacity of the water heater flows back intothe city main where the pressure is easilydissipated.A “closed water system”, however, preventsthe expanding water from flowing backinto the main supply line, and the result of“thermal expansion” can create a rapidand dangerous pressure increase in thewater heater and system piping. This rapidpressure increase can quickly reach thesafety setting of the relief valve, causingit to operate during each heating cycle.Thermal expansion, and the resulting rapidand repeated expansion and contraction ofcomponents in the water heater and pipingsystem can cause premature failure of therelief valve, and possibly the heater itself.Replacing the relief valve WILL NOTcorrect the problem!The suggested method of controlling thermalexpansion is to install an expansion tank inthe cold water line between the water heaterand the check valve (refer to the illustrationon the next page). The expansion tank isdesigned with an air cushion built in thatcompresses as the system pressure increases,thereby relieving the over pressure conditionand eliminating the repeated operation of therelief valve. Other methods of controllingthermal expansion are also available. Contactyour installing contractor, water supplier orplumbing inspector for additional informationregarding this subject.Water Supply ConnectionsRefer to the illustration on the next pagefor suggested typical installation. Theinstallation of flexible connectors isrecommended on the hot and cold waterconnections. Flexible connections providevibration isolation and allow the water heaterto be easily disconnected for servicing ifnecessary. The HOT and COLD waterconnections are clearly marked and are3/4in. NPT on all models. Install a shut-offvalve in the cold water line near the waterheater.See page 8 on "To Fill The Water Heater".NOTICE: DO NOT apply heat to theHOT or COLD water connections. If sweatconnections are used, sweat tubing toadapter before fitting adapter to the waterconnections on heater. Any heat applied tothe water supply fittings will permanentlydamage the dip tube and/or heat traps.Condensate DrainsConsult local codes or ordinances forspecific requirements. Refer to page 7. IMPORTANT: When making drain fittingconnections to the drain tubing, use a thinlayer of piping tape or silicone and installhand tight.All drain lines must be pitcheddownward away from the unit aminimum of 1/8" per foot of line toensure proper drainage. Drain lines must include a P-trap ifconnected to a sewer pipe.IMPORTANT: When making drain fittingconnections to the drain tubing, DO NOTovertighten. Overtightening fittings can splitpipe connections on the drain pan. If no drain is available, then a commoncondensate pump with a capacity noless than 2 gallon per day must beinstalled. DO NOT allow condensate to drain intothe water heater drain pan. The drain line should be insulatedwhere necessary to prevent sweatingand damage due to condensate formingon the outside surface of the line. 6This unit is equipped with a 3/4" NPTfemale primary condensate connectionand a 3/8" NPT female overflowconnection. Use MIP fittings forconnections.DO NOT reduce drain line size lessthan connection size provided oncondensate drain.

Typical InstallationCeiling6" Minimum clearance above heatpump to allow for filter maintenanceAir filterFlexible Connectionrecommended(Such as PEX)Temperatureand pressurerelief valve anddischarge lineHot water outletto fixturesPrimarycondensation(3/4") to opendrain oroutdoorsSecondary condensate tubing(3/8") to open drain or outdoorsFlexible Connectionrecommended(Such as PEX)Shut-offvalve6" Air gapDrainvalveHeat trap6" MinCold watersupplyThermal expansiontank (if required)A new combination temperature and pressure relief valve, complying with the Standard for ReliefValves for Hot Water Supply Systems, ANSI Z21.22/CSA 4.4, is factory installed and must remainin the opening provided and marked for the purpose on the water heater. No valve of any typeshould be installed between the relief valve and the tank.Relief Valve! WARNING: Thepressure rating ofthe relief valvemust not exceed150 PSI, themaximum workingpressure of thewater heater asmarked on therating plate.The btu/h rating of the relief valve mustnot be less than the input rating of thewater heater as indicated on the ratinglabel located on the front of the heater(1 watt 3.412 btu/h).Connect the outlet of the relief valveto a suitable open drain so that thedischarge water cannot contact liveelectrical parts or persons and toeliminate potential water damage.Piping used should be of a typeapproved for hot water distribution.The discharge line must be no smallerthan the outlet of the valve and mustpitch downward from the valve to allowcomplete drainage (by gravity) of therelief valve and discharge line. Theend of the discharge line should not bethreaded or concealed and should beprotected from freezing. No valve ofany type, restriction or reducer couplingshould be installed in the discharge line.7

Installing the water heaterTo Fill the Water Heater! WARNING: DO NOTturn on the electricalsupply or operate thiswater heater unless it iscompletely full of water.The tank must be full ofwater before water heateris turned on. The waterheater warranty does notcover damage or failureresulting from operationwith an empty or partiallyempty tank.Make certain the drain valve on thewater heater is completely closed.Open the shut-off valve in the coldwater supply line.A steady flow of water from the hotwater faucet(s) indicates a full waterheater.Open each hot water faucet slowly toallow the air to vent from the waterheater and piping.EcoNet CommunicationEcoNet communication is provided for integration with home automation,energy management, and demand response systems. Connectivity is providedthrough the EcoNet port or via wireless (Wi-Fi).Electrical PowerHookup TerminalsEcoNet lySCALE 1/1Right Side ViewElectrical Connections! WARNING: Turn off electricpower at the fuse box or servicepanel before making any electricalconnections.Also, the ground connection must becompleted before making line voltageconnections. Failure to do so can resultin electrical shock, severe personalinjury or death.Disconnect all power to unit beforestarting maintenance. Failure to do socan cause electrical shock resulting insevere personal injury or deathThe unit must be grounded. Failure8to do so can cause electrical shockresulting in severe personal injury ordeath.If the water heater has been subjectedto fire, flood or physical damage, DONOT operate the water heater againuntil it has been checked by a qualifiedservice technician.NOTICE: DO NOT use thisappliance if any part has been underwater. Immediately call a qualifiedinstaller or service agency to replacea flooded water heater. DO NOTattempt to repair the unit! It mustbe replaced.

Electrical Connections continued.Ground screwN INGWARConduitconnectorJunctionbox coverWire connectionsWater heater junction box.! DO NOT turn on theelectrical supply or operatethis water heater unless it iscompletely full of water.! WARNING: If local codesrequire external application ofinsulation blanket kits themanufacturer’s instructionsincluded with the kit must becarefully followed.A separate branch circuit with copperconductors, overcurrent protectivedevice and suitable disconnectingmeans must be provided by a qualifiedelectrician.The branch circuit wiring shouldinclude either: Metallic conduit or metallicsheathed cable approved for useas a grounding conductor andinstalled with fittings approvedfor the purpose.All wiring must conform to localcodes or latest edition of NationalElectrical Code ANSI/NFPA 70. Non-metallic sheathed cable,metallic conduit or metallicsheathed cable not approved foruse as a ground conductor shallinclude a separate conductor forgrounding. It should be attachedto the ground terminals of thewater heater and the electricaldistribution box.The water heater is completely wiredto the junction box inside jacket atthe top front of the water heater. Anopening for 1/2 in. or 3/4 in. electricalfitting is provided for field wiringconnections.The voltage requirements and wattageload for the water heater are specifiedon the rating plate on the front of thewater heater.! CAUTION: The presence of waterin the piping and water heater doesnot provide sufficient conduction for aground. Non-metallic piping, dielectricunions, flexible connectors etc. cancause the water heater to be electricallyisolated.Insulation BlanketsInsulation blankets, available to thegeneral public, for external use on electricwater heaters are not necessary. Thepurpose of an insulation blanket is toreduce the standby heat loss encounteredwith storage tank heaters. This waterheater meets or exceeds the NationalAppliance Energy Conservation Actstandards with respect to insulation andstandby loss requirements making aninsulation blanket unnecessary.! CAUTION: If local codes require theapplication of an external insulationblanket to this water heater, pay carefulattention to the following so as not torestrict the proper function andoperation of the water heater:The manufacturer’s warranty does notcover any damage or defect caused byinstallation, attachment or use ofany type of energy saving or otherunapproved devices (other than thoseauthorized by the manufacturer) into, ontoor in conjunction with the water heater.The use of unauthorized energy savingdevices may shorten the life of the waterheater and may endanger life and property. DO NOT cover air openings on bothsides of the water heater . DO NOT cover the operating orwarning labels attached to the waterheater or attempt to relocate them onthe exterior of insulation blanket. DO NOT cover the ControllerAssembly, temperature and pressurerelief valve or drain valve. Inspect the insulation blanket frequently.VerticalFlexibleFilterThe manufacturer disclaims anyresponsibility for such loss or injuryresulting from the use of suchAir filterunauthorized devices.must beAir OutletOpeningaccessible.ControllerAssemblySCALE 1/19

Installing the water heaterHot and Cold Pipe Insulation InstallationInstall the insulation on the cold water supply inlet and thehot water outlet as shown in the illustration.Hot WaterOutletReliefValveCold WaterinletDrainValveWater SensorWater SensorRope AttachmentPointIn order to detect the presence ofDrain Panunwanted water, this water heateris supplied with a built-in watersensing circuit. The water sensorrope is shipped in the warrantybag for field installation.Clips10Remove water sensor rope fromthe bag and attach to the connectorlocated near the lower accesspanel. Place the rope in therecommended drain pan andsecure to the pan bottom withprovided self adhesive clips.When water is detected, theelectronic control will turn offthe heating elements, flash thedisplay backlight and turn on anaudible alarm.

Ducting RequirementsAlways check with local building andHVAC codes before designing the ductsystemThe water heater may be ducted to theoutdoors or another space as described inthese instructions. Ducting configurationsthat does not comply with theseguidelines are not supported.DO NOT connect this water heater toexisting duct work; it must be ductedseparately from other appliances.Ducting approved for HVAC applicationsis required.Ducting must be adequately supportedalong both vertical and horizontallengths.UL Certified terminations must beused for ducting to the outside. Theseterminations have been evaluated toensure there is sufficient protectionfrom rain water entry and resistance toair flow is minimized.Indoor registers approved for HVACapplications is required.Rigid ducting must be isolated fromfloor joists or other structural membersto minimize the transmission of noiseand vibration. A short section (12inch minimum) of flexible duct mustbe used between the water heater andrigid ducting as an isolation method.Every foot of flexible ducting counts asthree feet of rigid ducting.Ducting must be insulated per HVACcodes (to prevent condensation).Ensure cold air exhaust is sufficientlyaway from structures to preventcondensation on surfaces.Maximum heater performance isobtained by lowering the resistance toair flow (regular filter maintenance isbeneficial) and providing the unit withwarm moist air.Considerations when planning the ductsystem: Run the ducting the most directroute possible. Limit the number of elbows/bends. Use the largest duct size possible. Use the largest termination possible. Consider placement and direction ofterminations (reduce recirculation ofexhaust into the intake).Calculated length of duct is thelength on the inlet plus the lengthon the outlet. Any combination ofduct lengths on the inlet and outlet issupported up to the maximum ductlength (Table 1).Duct System ConfigurationThe inlet and outlet ductingconnections on the water heateraccepts 8 inch diameter ducting. Noadditional adaptors are needed.7 inch, 6 inch, 5 inch diameterducting is supported. Table 1 lists thetotal feet of ducting allowed. Forduct diameters smaller than 8 inchdiameter, Table 1 takes into accountthe duct reducer(s) and up to 10 feetof 8 inch rigid ducting (two elbows)before the duct reducer(s) at the unit.Duct Reducers must be installedwithin 10 feet (two elbows) of the unitor within 2 feet of the end of the duct.Table 1.- Maximum Duct Length.Duct Type / 17'--11

Installing the water heaterEquivalent feet for Duct AccessoriesElbows/BendsRigid duct elbows and flex bendsgreater than 45 is considered an elbow.Flexible ducting bends’ inner radiuscannot be less than its diameter. Ifbends with tighter radiuses are needed,a rigid elbow must be used.Maximum number of elbows/bendsallowed are shown in [brackets] inTable 2.Terminations/RegistersTable 2 equivalent feet for terminationsincludes the rodent screen.For terminations and registers withsmaller diameters than the ductdiameter, Table 2 accounts for the ductreducer and termination/register. Smallerdiameter terminations and registerswith more than a 2 ft. connection is notsupported.DamperIf ducting to the outside using anexhaust duct only (no intake duct), anapproved Rheem damper should beinstalled no further than 10 ft. of rigidducting total (two elbows equivalent)from the unit. This prevents outsideair from coming into the living space.If ducting air from the outside tothe inlet of the heater, no provisionis made to prevent outside air fromflowing into the living space.Table 2.- Equivalent feet for Duct Accessories.DescriptionElbows/Flexible Bends (Each)[Maximum Allowed]8 inch UL Certified Termination for ducting outside (Each)Reduced diameter UL Certified Termination for ducting outside (Each)8 inch Register for ducting inside (Each)Reduced diameter Register for ducting inside (Each)Rodent Screen (must be greater than 83% open area) (Each)Rheem approved 8" diameter Duct able 2 lists equivalent feet for duct accessories and reduced diameter terminations.Accessory Kits12Part NumberDescriptionUser ForSP20882Earthquake Isolation Kit for Hybrid Water Heater. Installations in Seismic Regions.SP20883Vibration Isolation Kit for Hybrid Water Heater.SP208848” Dia. UL Certified Termination kit.SP208857” Dia. UL Certified Termination kit.SP208866” Dia. UL Certified Termination kit.SP208875” Dia. UL Certified Termination kit.SP208888" Rheem Approved Damper Kit.SP2088925’ Flexible 8” dia. duct kit.Installation on Non-Concretefloors.Termination to the outside or toattic with 8" diameter.Termination to the outside or toattic with 7" diameter.Termination to the outside or toattic with 6" diameter.Termination to the outside or toattic with 5" diameter.Exhaust only to the outside DuctingConfiguration (No inlet Duct).For up to 25' of Ducting.SP20890Rigid Elbow duct kit.Installation in tight places wherespace needs to be minimized.

Ducting Example:Exhaust/Inlet or both? Both, Inlet and OutletNOTICE: Theseseven questionsshould be answeredto ensure correct ductconfiguration.See Ducting Example.Ducting to outside of building or another room? Outside building.Length of duct from water heater to termination? 20 ft.Flexible or Rigid ducting? Flexible.Diameter of ducting used? 8 in. DiameterDiameter of wall penetrations? 5 in. DiameterNumber of elbows/bends? 3 Total – One on inlet and Two on OutletI. Does calculated ducting length exceed maximum allowable table?a. 20 ft. (Outlet duct length)b. 10 ft. (1 rigid elbow and 1 bend on outlet)c. 20 ft. (reduced diameter termination outlet)d. 20 ft. (Inlet duct length)e. 5 ft. (1 Bend on inlet)f. 20 ft. (reduced diameter termination inlet)g. Total 20 10 20 20 5 20 95 ft.Using flexible 8 in. diameter duct, the maximum duct length allowed is 125ft.; therefore, because 95 ft. is less than 125 ft., this is an acceptable ductingconfiguration.Accesory Kits SP20887 (2 Kits), SP20889 (2 Kits) and SP20890 (1 Kit) shouldbe purchased for this installation.Flex Duct secured andsealed with Duct tie(2 places on Inlet)(1 place on Outletto secure Flex Duct to unit flange)Horizontal DuctInstallationRigid AdjustableElbowFlex DuctInsulation Extentedover Rigid Ductingand secured withDuct Tie8” InsulatedFlex Duct6” Clearancefor filterAir Inlet8” to 5”Duct ReducersRigid Ductsecured with 4screws to unitflange8” Insul

The water heater and water lines should be protected from freezing temperatures. DO NOT install the water heater in outdoor, unprotected areas. Make certain the floor underneath the water heater is strong enough to sufficiently support the weight of the water heater once it is filled with water. For installation on floors other than