M7RL Series Downflow Condensing Gas Furnace Direct Vent (Sealed Combustion) Forced Air 95.1% AFUE

INSTALLATION INSTRUCTIONS

HUD Manufactured Home Construction and Safety Standards (3280.714) prohibit the use of noncertified air conditioning or heat pump equipment with this furnace. It is strongly recommended that NORDYNE manufactured housing air conditioning components (Intertherm or Miller brands) be selected to provide a matched system specifically designed to meet these requirements.

The cutting, splicing or modifying of any internal electrical wiring may void product warranties and create a hazardous condition. Failure to comply with these standards could also provide inadequate heating or cooling performance and cause structural damage to a manufactured home.

Please contact your local Intertherm or Miller distributor for help. A directory of NORDYNE factory authorized service is located in the furnace homeowner packet.

Reference: HUD Manufactured Home Construction and Safety Standards 3280.714.

CAUTION:

DO NOT DESTROY THIS MANUAL. KEEP IN A SAFE PLACE FOR FUTURE REFERENCE.

FIRE OR EXPLOSION HAZARD•Failure to follow safety warnings exactly

could result in serious injury or property damage.

• Installationandservicemustbeperformedby a qualified installer, service agency or the gas supplier.

•Do not store or use gasoline or otherflammable vapors and liquids in the vicinity of this or any other appliance.

WHAT TO DO IF YOU SMELL GAS•Donottrytolightanyappliance.•Donottouchanyelectricalswitch;donot

use any phone in your building.•Leavethebuildingimmediately.• Immediatelycallyourgassupplier froma

neighbor’s phone. Follow the gas supplier’s instructions.

• Ifyoucannotreachyourgassupplier,callthe fire department.

RISQUE D’INCENDIE OU D’ EXPLOSION•Le non-respect des avertissements de

sécurité pourrait entraîner des blessures graves, la mort ou des dommages matériels.

•L’installation et l’entretien doivent êtreeffectués par un installateur qualifié, un organisme de service ou le fournisseur de gazstaller, service agency or the gas supplier.

•Nepasentreposerniutiliserdel’essencenid’autres vapeurs ou liquides inflammables dans le voisinage de cet appareil, ni de tout autre appareil.

QUE FAIRE S’IL Y A UNE ODEUR DE GAZ•Nepastenterd’allumeraucunappareil.•Netoucheràaucuninterrupteurélectrique;

n’utiliser aucun téléphone dans le bâtiment.•Évacuerl’immeubleimmédiatement.•Appeler immédiatement le fournisseur de

gaz en employant le téléphone d’un voisin. Respecter à la lettre les instructions dufournisseur de gaz.

•Sipersonnenerépond,appeler leservicedes incendies.

WARNING: AVERTISSEMENT:

For Installation in:• ManufacturedHomes• ParkModels,&Manufactured

Buildings• ModularHomes/Buildings

2

IMPORTANT SAFETY INFORMATION .......................3

GENERAL INFORMATION ..........................................4Requirements&Codes............................................4ClearancestoCombustibleMaterials.......................5CombustionAirQuality.............................................5HeatingLoad............................................................5CondensateDisposal...............................................5

COMBUSTION AIR & VENTING REQUIREMENTS ....6ImportantInformation...............................................7CategoryIVAppliances............................................7DirectVentInstallation..............................................7

VentPipeLength&Diameter................................. 7VentPipeMaterial.................................................. 8VentPipeInstallation.............................................. 8OutdoorTerminations-HorizontalVenting............. 8OutdoorTerminations-VerticalVenting................. 9VentFreezingProtection...................................... 10ExistingInstallations............................................. 10

VentilaireIIIorIVAirQualityPackage................... 10

CIRCULATING AIR REQUIREMENTS ...................... 11Plenums&AirDucts.............................................. 11SupplyAirConnections.......................................... 11ReturnAirConnections.......................................... 11Closet&AlcoveInstallations.................................. 12FurnaceFilter......................................................... 12Dampers................................................................. 12AcousticalTreatments............................................ 12

FURNACE INSTALLATION ....................................... 13AbouttheFurnace.................................................. 13BeforeYouInstallthisFurnace............................... 13LocatingtheUnit.................................................... 13

Locating&CuttingFloorOpenings...................... 14Locating&CuttingCeilingOpenings.................... 14

InstallingFingerTabbedDuctConnectors............. 14NarrowDuctAttachment-Option1...................... 15NarrowDuctAttachment-Option2...................... 15

InstallingScrew-DownDuctConnectors................ 16InstallingRoundDuctConnectors.......................... 16InstallingtheFurnace............................................. 16CondensateDrainage............................................ 16

GAS SUPPLY & PIPING ............................................ 17LeakCheck........................................................... 18High-AltitudeApplication........................................ 19ConvertingtoLP/PropaneGas............................ 19

RemovingtheBurnerOrifices.............................. 20GasPressureAdjustment...................................... 20

MeasuringtheSupplyGasPressure.................... 20Lighting&AdjustmentoftheAppliance................ 21MeasuringtheManifoldPressure......................... 21AdjustingtheManifoldPressure........................... 21RemovingtheManometer/PressureGauge...... 21

CompletingtheConversion.................................... 21

ELECTRICAL WIRING ............................................... 22LineVoltageWiring................................................ 22Thermostat/LowVoltageConnections................. 22

HeatAnticipator.................................................... 23Grounding............................................................... 23

START-UP&ADJUSTMENTS ................................... 24Pre-StartChecklist................................................. 24Start-UpProcedures.............................................. 24Verifying&AdjustingInputRate............................. 24Verifying&AdjustingTemperatureRise................. 24VerifyingBurnerOperation..................................... 25VerifyingOperationoftheSupplyAirLimitSwitch............................................................ 25

OPERATING SEQUENCE ......................................... 26HeatingCycle......................................................... 26CoolingCycle......................................................... 26FanMode............................................................... 26

MAINTENANCE ......................................................... 26AirFilters................................................................ 27BlowerCompartment.............................................. 27CleaningofBurners................................................ 27VentSystem........................................................... 27HeatExchanger&BurnerMaintenance................. 27Lubrication.............................................................. 27

TROUBLESHOOTING ............................................... 28

DESCRIPTION OF COMPONENTS .......................... 28

FIGURES & TABLES ................................................. 29FurnaceDimensions............................................... 29

Figure23-ACabinetModels(Short)................... 29Figure24-BCabinetModels(Tall)...................... 30Figure25-BCabinetModels(TopReturnAir).... 31

WiringDiagram....................................................... 32Figure26-M7RLWiringDiagram........................ 32

GasInformation...................................................... 33Table8-GasFlowRates..................................... 33Table9-GasPipeCapacities.............................. 33Table10-HighAltitudeDerationChartfor

PropaneGas....................................... 34Table11-NaturalGasHeatingValues.................34Table12-HighAltitudeDerationChartfor

Nat.Gas-HighHeatingValues........... 34Table13-HighAltitudeDerationChartfor

Nat.Gas-LowHeatingValues............ 34

VentingInformation................................................ 35Table14-VentTerminationClearances............... 35Figure27-Horizontal&VerticalVenting.............. 36

INSTALLATION / PERFORMANCE CHECKLIST ..... 40

TABLE OF CONTENTS

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IMPORTANT SAFETY INFORMATIONINSTALLER:Pleasereadallinstructionsbeforeservicingthisequipment.Payattentiontoallsafetywarningsandanyotherspecialnoteshighlightedinthemanual.Safetymarkingsareusedfrequentlythroughoutthismanualtodesignateadegreeor levelofseriousnessandshouldnotbeignored.

WARNING indicates a potentially hazardous situationthatifnotavoided,couldresultinpersonalinjuryordeath.

CAUTIONindicatesapotentiallyhazardoussituationthatifnotavoided,mayresultinminorormoderateinjuryorpropertydamage.

• Tominimizeequipmentfailureorpersonalinjury,itisessentialthatonlyqualifiedindividualsinstall,service,ormaintainthisequipment.Ifyoudonotpossesmechanicalskillsortools,callyourlocaldealerforassistance.

• Follow all precautions in the literature, on tags, andon labels provided with the equipment. Read andthoroughlyunderstand the instructionsprovidedwiththeequipmentpriortoperformingtheinstallationandoperationalcheckoutoftheequipment.

• Usecautionwhenhandlingthisapplianceorremovingcomponents.Personalinjurycanoccurfromsharpmetaledgespresentinallsheetmetalconstructedequipment.

• Donotstoreanyofthefollowingon,orincontactwith,the unit: Rags, brooms, vacuum cleaners, or othercleaningtools,sprayoraerosolcans,soappowders,bleaches, waxes, cleaning compounds, plastics orplasticcontainers,paperbagsorotherpaperproducts,gasoline,kerosene,cigarettelighterfluid,drycleaningfluids,paintthinners,orothervolatilefluids.

• Installationofequipmentmayrequirebrazingoperations.Installer must comply with safety codes and wearappropriate safety equipment (safety glasses, workgloves,fireextinguisher,etc.)whenperformingbrazingoperations.

• Theinstallershouldbecomefamiliarwiththeunitswiringdiagrambeforemakinganyelectricalconnectionstotheunit.SeetheunitwiringlabelorFigure26(page32).

• Alwaysreinstall thedoorson the indoorblowerafterservicingorcleaning/changingthefilters.Donotoperatetheindoorblowerwithoutalldoorsandcoversinplace.

WARNING:The safety information listed in this manual must be followed during the installation, service, and operation of this unit. Unqualified individuals should not attempt to interpret these instructions or install this equipment. Failure to follow safety recommendations could result in possible damage to the equipment, serious personal injury or death.

WARNING:ELECTRICAL SHOCK, FIRE OR EXPLOSION HAZARD

Failuretofollowsafetywarningsexactlycouldresult in serious injury or property damage.

Improper servicing could result in dangerous operation, serious injury, death or property damage.

• Before servicing, disconnect all electricalpower to the indoor blower.

• Whenservicingcontrols,labelallwirespriorto disconnecting. Reconnect wires correctly.

• Verifyproperoperationafterservicing.

WARNING:FIRE OR EXPLOSION HAZARD

•Failuretofollowsafetywarningsexactlycouldresult in serious injury or property damage.

• Installationandservicemustbeperformedbya qualified installer, service agency or the gas supplier.

•Donotstoreorusegasolineorotherflammablevapors and liquids in the vicinity of this or any other appliance.

WHAT TO DO IF YOU SMELL GAS•Donottrytolightanyappliance.•Donottouchanyelectricalswitch;donotuse

any phone in your building.•Leavethebuildingimmediately.• Immediately call your gas supplier from a

neighbor’s phone. Follow the gas supplier’s instructions.

• Ifyoucannotreachyourgassupplier,callthefire department.

WARNING:Improper installation, service, adjustment, or maintenance may cause explosion, fire,electrical shock or other hazardous conditions which may result in personal injury or property damage. Unless otherwise noted in these instructions, only factory authorized kits or accessories may be used with this product.

WARNING:Unless otherwise noted in these instructions, only factory authorized kits or accessories may be used with or when modifying this product.

4

GENERAL INFORMATIONRequirements & Codes

WARNING:This unit must be installed in accordance with instructions outlined in this manual during the installation, service, and operation of this unit. Unqualified individuals should not attempt to interpret these instructions or install this equipment. Failure to follow safety recommendations could result in possible damage to the equipment, serious personal injury or death..

• The installer must comply with all local codes andregulationswhichgoverntheinstallationofthistypeof equipment. Local codes and regulations takeprecedenceoveranyrecommendationscontainedintheseinstructions.ConsultlocalbuildingcodesandtheNationalElectricalCode(ANSICI)forspecialinstallationrequirements.

• Allelectricalwiringmustbecompletedinaccordancewith local,stateandnationalcodesandregulationsandwiththeNationalElectricCode(ANSI/NFPA70)orinCanadatheCanadianElectricCodePart1CSAC.22.1.

• This furnace must be installed in accordance withtheseinstructions,allapplicablelocalbuildingcodesandthecurrentrevisionoftheNationalFuelGasCode(NFPA54/ANSIZ223.1)ortheNaturalGasandPropaneInstallationCode,CAN/CGAB149.1.

• Useonlywithtypeofgasapprovedforthisfurnace.Refertothefurnaceratingplate.

• Installthisfurnaceonlyinalocationandpositionasspecifiedonpage13.

• Provideadequatecombustionandventilationairtothefurnacespaceasspecifiedonpages6-7.

• ProvideadequateclearancesaroundtheventairintaketerminalasspecifiedinFigures1-4(page9).

• Combustionproductsmustbedischargedoutdoors.Connectthisfurnacetoanapprovedventsystemonly,asspecifiedonpages7-10.

• Never test forgas leakswithanopenflame.Useacommercially available soap solution to check allconnections.Seepages17-18.

• Thisfurnaceisdesignedtooperatewithamaximumexternalpressureriseof0.3inchesofwatercolumn.ConsultTable6(page25)andtheratingplateforthepropercirculatingairflowandtemperaturerise. It isimportantthattheductsystembedesignedtoprovidethecorrectflowratesandexternalpressurerise.Animproperlydesignedductsystemcanresultinnuisanceshutdowns,andcomfortornoiseissues.

• Thisfurnacemustnotbeusedfortemporaryheatingofbuildingsorstructuresunderconstruction.

• The Commonwealth of Massachusetts requirescompliancewithregulation248CMR4.00and5.00forinstallationofthrough–the–wallventedgasappliancesasfollows:

1.For direct-vent appliances, mechanical-vent heatingappliancesordomestichotwaterequipment,wherethebottomoftheventterminalandtheairintakeisinstalledbelowfourfeetabovegradethefollowingrequirementsmustbesatisfied:a.)Acarbonmonoxide(CO)detectorandalarmshallbe

placedoneachfloorlevelwheretherearebedrooms.Thedetector shall complywithNFPA720 (2005Edition)andbemountedinthelivingareaoutsidethebedroom(s).

b.)A(CO)detectorshallbelocatedintheroomthathousestheapplianceorequipmentandshall:•Bepoweredbythesameelectricalcircuitasthe

applianceorequipment.Onlyoneserviceswitchshallpowertheapplianceandthe(CO)detector;

•Havebatteryback-uppower;•MeetANSI/UL2034Standardsandcomplywith

NFPA720(2005Edition);andApprovedandlistedbyaNationallyRecognizedTestingLaboratoryasrecognizedunder527CMR.

c.)AProduct-approvedvent terminalmustbeused,andifapplicable,aproduct-approvedairintakemustbeused.Installationshallbe instrictcompliancewith the manufacturer’s instructions. A copy ofthe installation instructions shall remain with theapplianceorequipmentat the completionof theinstallation.

d.)Ametalorplasticidentificationplateshallbemountedattheexteriorofthebuilding,4feetdirectlyabovethelocationofventterminal.Theplateshallbeofsufficientsize,easilyreadfromadistanceofeightfeetaway,andread“GasVentDirectlyBelow”.

2.For direct-vent appliances, mechanical vent heatingappliancesordomestichotwaterequipmentwherethebottomoftheventterminalandtheairintakeisinstalledabovefourfeetabovegradethefollowingrequirementsmustbesatisfied:a.)A(CO)detectorandalarmshallbeplacedoneach

floorlevelwheretherearebedrooms.ThedetectorshallcomplywithNFPA720(2005Edition)andbemountedinthelivingareaoutsidethebedroom(s).

b.)The(CO)detectorshall:•Belocatedintheroomthathousestheappliance

orequipment;•Behard-wired,batterypoweredorboth.•ShallcomplywithNFPA720(2005Edition).

c.)Aproduct-approvedvent terminalmustbeused,andifapplicable,aproduct-approvedairintakemustbeused.Installationshallbe instrictcompliancewith the manufacturer’s instructions. A copy ofthe installation instructions shall remain with theapplianceorequipmentat the completionof theinstallation.

5

Clearances to Combustible MaterialsThisfurnaceisDesignCertifiedintheU.S.andCanadaby CSA International for the minimum clearances tocombustiblematerials.NOTE:The furnace is listed forinstallationoncombustibleornon-combustibleflooring.However,woodistheonlycombustibleflooringallowedforinstallation.Toobtainfurnacebasemodelnumberandspecificclearanceinformation,refertothefurnaceratingplate,locatedinsideofthefurnacecabinet.

Access for positioning and servicing the unit must beconsidered when locating unit. The need to provideclearance for access to panels or doors may requireclearancedistancesoverandabove the requirements.Allow 18 inches minimum clearance from the front of the unit. However 36 inches is strongly recommended. SeeTable1forminimumclearancerequirements.

Theductworkshouldbeappropriatelysizedtothecapacityof the furnace to ensure its proper airflow rating. Forinstallationsabove2,000ft.,thefurnaceshouldhaveasealevelinputratinglargeenoughthatitwillmeettheheatingloadafterderationforaltitude.

Combustion Air Quality

CAUTION:Combustion air must not be drawn from a corrosive atmosphere.

To maximize heat exchanger life, the combustion airmustbefreeofchemicalsthatcanformcorrosiveacidiccompoundsinthecombustiongases.Therequiredsourceofcombustionairistouseoutdoorair.

Exposuretothefollowingsubstancesinthecombustionairsupplywill result insafetyandperformancerelatedproblems.Thelistbelowcontainsexamplesofchemicalcontainments found in a wide variety of commoncommercialhouseholdproducts:

•Permanentwavesolutions•Chlorinatedwaxesandcleaners•Chlorinebasedswimmingpoolchemicals•Watersofteningchemicals•De-icingsaltsorchemicals•CarbonTetrachloride•Halogentyperefrigerants•Cleaningsolvents(perchloroethylene)•Printinginks,paintremovers,varnishes,etc.•HydrochloricAcid•Cementsandglues•Antistaticfabricsofteners•Masonryacidwashingmaterials

Heating LoadThisfurnaceshouldbesizedtoprovidethedesignheatingloadrequirement.HeatingloadestimatescanbemadeusingapprovedmethodsavailablefromAirConditioningContractorsofAmerica(ManualJ);AmericanSocietyofHeating,Refrigerating,andAirConditioningEngineers;or other approved engineering methods. Excessiveoversizing of the furnace could cause the furnace and/or vent to fail prematurely.

Condensate DisposalThemethodfordisposingofcondensatevariesaccordingtolocalcodes.Consultyourlocalcodeorauthorityhavingjurisdiction. Neutralizer kit P/N 902377 is available forusewith this furnace.Please follow the instructions provided with the kit.

Table 1. Minimum Clearance Requirements

INSTALLATION CLEARANCES

CLOSET ALCOVE

Front* 1" 1"Rear 0" 0"Sides 0" 0"Top 6" 6"Ductw/in3ftoffurnace 1/4" 1/4"Vent 0” 0”PlenumWithoutCoilBox 1" 1"PlenumWithCoilBox 0” 0”

NOTES:

AlcoveInstallations-Allow18in.minimumclearancefromfrontofunittonearestwallorpartitionforservicing.

Closetinstallations-Requireareturnairgrillinstalledin the door or a partially louvered door across theopening forproperair circulation.Forclearances6”orgreater,theclosetmusthaveanopenfreeareaof235in2minimum.Forspecialclearancesbetween1”&6”,requirementsarealouvereddoorwithaminimumof250in2(1613cm2)freearea.For1”clearancefromfurnace,usea fully louvereddoorwithat least400in2offreeairflowarea.Afullylouveredclosetdoorisstronglyrecommendedforallinstallationtypes.

LEFTSIDE

FRONT

RIGHTSIDE

REAR

RIGHTSIDE

SHORT A-SIZE CABINET & TALL B-SIZE CABINET TALL B-SIZE CABINET WITH TOP AIR RETURN

REAR

LEFTSIDE

FRONTVENTVENT

6

COMBUSTION AIR & VENTING REQUIREMENTS

WARNING:CARBON MONOXIDE POISONING HAZARD

Failure to follow the steps outlined below for each appliance connected to the venting system being placed into operation could result in carbon monoxidepoisoningordeath.Thefollowingstepsshall be followed with each individual appliance connected to the venting system being placed in operation, while all other appliances connected to the venting system are not in operation:

1. Seal any unused openings in the venting system.

2. Inspect the venting system for proper size and horizontal pitch, as required in the National Fuel Gas Code, ANSI Z223.1/NFPA 54 or the CSA B149.1, Natural Gas and Propane Installation Codes and these instructions. Determine that there is no blockage or restriction, leakage, corrosion and other deficiencies which could cause an unsafe condition.

3. As far as practical, close all building doors and windows and all doors between the space in which the appliance(s) connected to the venting system are located and other spaces of the building.

4. Close fireplace dampers.5. Turn on clothes dryers and any appliance

not connected to the venting system. Turn on anyexhaust fans,suchas rangehoodsandbathroomexhausts,sotheyareoperatingatmaximum speed. Do not operate a summerexhaustfan.

6. Follow the lighting instructions. Place the appliance being inspected into operation. Adjust the thermostat so appliance is operating continuously.

7. Test for spillage from draft hood equipped appliances at the draft hood relief opening after 5 minutes of main burner operation. Use the flame of a match or candle.

8. If improper venting is observed during any of the above tests, the venting system must be corrected in accordance with the National Fuel Gas Code, ANSI Z223.1/NFPA 54 and/or CSA B149.1, Natural Gas and Propane Installation Codes.

9. After it has been determined that each appliance connected to the venting system properly vents when tested as outlined above, return doors, windows,exhaustfans,fireplacedampersandanyothergas-firedburningappliancetotheirprevious conditions of use.

AVERTISSEMENT:RISQUE D’EMPOISONNEMENT AU

MONOXYDE DE CARBONED

Le non-respect des consignes suivantes portantsur chacun des appareils raccordés au système d’évacuation mis en service pourrait entraîner l’empoisennement au monoxyde de carbone oula mort. Les consignes suivantes doivent êtreobservées pour chaque appareil raccordé au système d’évacuation mis en service si les autres appareils raccordés au système ne sont pas en service:

1. Sceller toute ouverture non utilisée de la systéme d’évacuation;

2. S’assurer que la systéme d’évacuation présente des dimensions et une pente horizontale conformes à la norme ANSI Z223.1/NFPA54, intitulée National Fuel Gas Code ou auxcodes d’installation CSA-B149.1, ainsi qu’auxprésentes instructions. S’assurer que la systéme d’évacuation n’est pas bloquée, restreinte, corrodée, qu’elle ne fuit pas et qu’elle ne présente aucunautredéfautpotentiellementdangereux;

3. Dans la mesure du possible, fermer toutes les portesetfenêtresdubâtiment,ettouteslesportesentrelapièceoùsetrouvel’appareilraccordéàla systéme d’évacuation et les autres pièces du bâtiment.

4.Fermerlesregistresdesfoyers;5. Mettre en service les sécheuses et tout autre

appareil qui n’est pas raccordé à la systémed’évacuation.Fairefonctionneràrégimemaximaltout ventilateur d’évacuation, tel que les hottes de cuisinière et les ventilateurs de salles de bains. Ne pas mettre en service les ventilateurs d’été.

6. Respecter les instructions d’allumage. Mettre en servicel’appareilàl’essai.Réglerlethermostatdemanièreàcequel’appareilfonctionnesansinterruption;

7.Vérifier s’il y a débordement à l’orificed’évacuation du coupe tirage des appareils dotés d’un coupe tirage 5 minutes après l’allumage du brûleur principal. Utiliser la flamme d’une allumette ou d’une chandelle.

8. Si l’on constate, au cours de l’un des essais qui précèdent, que l’évacuation est déficiente, corriger le système d’évacuation conformément à lanormANSIZ223.1/NFPA54,NationalFuelGasCode,et(ou)auxcodesd’installationCSAB149.1.

9. Après avoir déterminé que tous les appareils raccordésà lasystémed’évacuationévacuentcorrectement tel que prescrit ci-dessus,rouvrirlesportesetlesfenêtresetremettrelesventilateurs d’évacuation, les registres de foyers ettoutautreappareilfonctionnantaugazàleurétat de fonctionnement initial.

7

Direct Vent InstallationThiscondensingfurnaceiscertifiedforinstallationasaDirectVent(2-pipe)appliance.DirectVent(2-pipe)furnacesdrawcombustionairdirectlyfromtheoutdoorsandthenventthecombustionproductsbackoutside,isolatingtheentiresystemfromtheindoorspace.Itisimportanttomakesurethatthewholesystemissealedandclearancestocombustiblesaremaintainedregardlessoftheinstallationbeing in a confined or unconfined space.This sectionspecifiesinstallationrequirementsforDirectVent(2-pipe)piping.Table2(page8)containsthelengthofventandcombustionairpipingforthistypeofinstallation.

Provisionsmustbemadeduringtheinstallationofthisfurnacethatprovideanadequatesupplyoffreshairforcombustionandventilation.Thecombustionairfromtheoutsideneedstobeclearofchemicalsthatcancausecorrosion. The inlet pipe should not be placed nearcorrosivechemicalssuchasthoselistedonpage5.

Airopeningsontopofthefurnaceandopeningsinclosetdoorsorwallsmustneverberestricted.Ifthefurnaceisoperatedwithoutadequateairforcombustion,theflameroll-outswitchwillopen,turningoffthegassupplytotheburners.NOTE:This safety device is a manually reset switch. DO NOT install jumper wires across these switches to defeat their function or reset a switch without identifying and correcting the fault condition.Ifaswitchmustbereplaced,useonlythecorrectsizedpartspecifiedintheReplacementPartsListprovidedonline.

VentPipeLength&DiameterForproperfurnaceoperation,thecombustionairandventpipingmustnotbeexcessivelyrestrictive.

• Theventingsystemshouldbedesignedtohavetheminimumnumberofelbowsorturns.

• Allhorizontalrunsmustslopeupwardsfromthefurnaceat1/4inchminimumperrunningfootofvent.

• Transitiontothefinalventdiametershouldbedoneasclosetothefurnaceoutletaspractical.

• Alwaysusethesamesizeoralargerpipeforcombustionairthatisusedfortheexhaustvent.

Table2(page8)indicatesthemaximumallowablepipelengthforafurnaceofknowninputrate,wheninstalledwithpipingofselecteddiameterandnumberofelbows.Tousethetable,thefurnaceinputrate,thecenterlinelengthandthenumberofelbowsoneachpipemustbeknown.

Whenestimatingthelengthofventruns,considerationmustbemadetotheeffectofelbowsandotherfittings.Thisisconvenientlyhandledusingtheideaof“equivalentlength”.Thismeansthefittingsareassignedalinearlengththataccountsforthepressuredroptheywillcause.Forexample:a3”diameter, longradiuselbowisworththeequivalentof3.5feetoflinearrun.

Theequivalent lenghtsof teesandvariouselbowsarelistedinTable2.Measurethelinearlengthofyourventrunandthenaddintheequivalentlengthofeachfitting.The

Important Information

WARNING:Furnace installation using methods other than those described in the following sections must comply with the National Fuel Gas Code (NFGC) and all applicable local codes.

WARNING:Upon completion of the furnace installation, carefully inspect the entire flue system both inside and outside the furnace to assure it is properly sealed. Leaks in the flue system can result in serious personal injury or death due toexposureofflueproducts,includingcarbonmonoxide.

WARNING:This furnace must not be vented with other appliances, even if that appliance is of the condensing type. This includes water heaters of any efficiency. Common venting can result in severe corrosion of other appliances or their venting and can allow combustion gases to escape through such appliances or vents. Do not vent the furnace to a fireplace chimney or building chase.

• This furnace must be vented in compliance withthe current revision of the National Fuel Gas Code(ANSI-Z223.1/NFPA54). Instructions for determiningthe adequacy of combustion air for an installationcan be found in the current revision of the NFGC(ANSI Z223.1 / NFPA54). Consult local codes for special requirements. These requirements are forUSinstallationsasfoundintheNFGC.

• TherequirementsinCanada(B149.1)arestructureddifferently. In Canada, venting shall conform to therequirementsofthecurrent(CAN/CGAB149.1or.2)installationcodes.Consult local codes for special requirements.

Category IV AppliancesThisfurnaceisclassifiedasa“CategoryIV”appliance,whichrequiresspecialventingmaterialsandinstallationprocedures.CategoryIVappliancesoperatewithpositiveventpressureandrequiresthoroughlysealedventsystems.Theyalsoproduce liquidcondensate,which is slightlyacidicandcancauseseverecorrosionofordinaryventingmaterials.Furnaceoperationcanbeadverselyaffectedbyrestrictiveventandcombustionairpiping.

8

MaximumDirectVent,DualPipeLength(FT.)FURNACE MODELS

(BTU)INLET / OUTLET

3” Diameter

45,000 60

60,000 60

72,000 60

†NOTES:

1Subtract3.5ft.foreachadditional3inchlongradiuselbow,and7ft.foreachadditional3inchshortradiuselbow.

2.Two45degreeelbowsareequivalenttoone90degreeelbow.

3.Thistableappliesforelevationsfromsealevelto2,000ft.Forhigherelevations,decreasepipelengthsby8%per1,000ftofaltitude.

Table 2. Vent Pipe Lengths

cause corrosion of the furnace combustion system.(Seepage5forasamplelistofsubstances).

• Routepipingasdirectaspossiblebetweenthefurnaceand the outdoors. Longer vent runs require largerdiameters.Ventpipingmustbeslopedupwards1/4”perfootinthedirectionfromthefurnacetotheterminal.Thisensuresthatanycondensateflowsbacktothecondensatedisposalsystem.

• When a Direct Vent (2-pipe) system is used, thecombustionair intakeandtheventexhaustmustbelocatedinthesameatmosphericpressurezone.ThismeansbothpipesmustexitthebuildingthroughthesameportionofexteriorwallorroofasshowninFigure27,page36.

• Piping must be mechanically supported so that itsweightdoesnotbearonthefurnace.Pipesupportsmustbeinstalledaminimumofeveryfivefeetalongtheventruntoensurenodisplacementafterinstallation.Supportsmaybeatshorterintervalsifnecessarytoensurethattherearenosaggingsectionsthatcantrapcondensate. It is recommended to install couplingsalongtheventpipe,oneithersideoftheexteriorwall(Figure27).Thesecouplingsmayberequiredbylocalcode.

• Ifbreakableconnectionsarerequiredinthecombustionairinletpipe(ifpresent)andexhaustventpiping,thenstraight neoprene couplings for 3” piping with hoseclampscanbeused.Thesecouplingscanbeorderedthrough your local furnace distributor. To install acoupling:1. Slidetherubbercouplingovertheendofthepipe

thatisattachedtothefurnaceandsecureitwithoneofthehoseclamps.

2. Slidetheotherendoftherubbercouplingontotheotherpipefromthevent.

3. Securethecouplingwiththesecondhoseclamp,ensuringthattheconnectionistightandleakfree.

OutdoorTerminations-HorizontalVenting• Ventandcombustionairintaketerminationsshallbe

installedasshowninFigures1&2(page9)andinaccordancewiththeseinstructions:

• VentterminationclearancesmustbeconsistentwiththeNFGC,ANSI2223.1/NFPA54and/ortheCSAB149.1,NaturalGasandPropaneInstallationCode.Table12(page32)liststhenecessarydistancesfromtheventterminationtowindowsandbuildingairintakes.

• Vent and combustion air intake terminations mustbe located to ensure proper furnace operation andconformance to applicable codes. A vent terminalmustbelocatedat least3feetaboveanyforcedairinletlocatedwithin10feet.Thisdoesnotapplytothecombustionairinletofadirectvent(twopipe)appliance.InCanada,CSAB149.1takesprecedenceovertheseinstructions.SeeTable14(page35).

• Allminimumclearances(Figure2)mustbemaintainedtoprotectbuildingmaterialsfromdegradationbyfluegases.

totallength,includingtheequivalentfittinglengths,mustbelessthanthemaximumlengthspecifiedinthetable.

Condensingfurnacecombustionproductshaveverylittlebuoyancy,soTable2istobeusedwithoutconsiderationofanyverticalriseinthepiping.

VentPipeMaterialVentandcombustionairpipeandfittingsmustbeoneofthefollowingmaterialsinthelistandmustconformtotheindicatedANSI/ASTMstandards.CementmustconformtoASTMStandardD2564forPVCandStandardD2235forABS.PVCprimermustmeetstandardASTMF656.WhenjoiningPVCpipingtoABS,usePVCsolventcement.(SeeprocedurespecifiedinASTMStandardD3138).

In Canada, all plastic vent pipes and fittings includinganycement,cleaners,orprimersmustbecertifiedasasystemtoULCS636.Howeverthisrequirementdoesnotapplytopipinginternaltothefurnace.

Materials StandardsSCHEDULE40PVC............................................... D1785PVC-DWV.............................................................. D2665SDR-21&SDR-26................................................. D2241ABS-DWV.............................................................. D2661SCHEDULE40ABS.............................................. F628FOAM/CELLULARCOREPVC........................... F891

VentPipeInstallation

CAUTION:Combustion air must not be drawn from a corrosive atmosphere.

Thisfurnacehasbeencertifiedforinstallationwithzeroclearancebetweenventpipingandcombustiblesurfaces.However,itisgoodpracticetoallowspaceforconvenienceininstallationandservice.

• Thequalityofoutdoorairmustalsobeconsidered.Besurethatthecombustionairintakeisnotlocatednearasourceofsolventfumesorotherchemicalswhichcan

9

• For optimal performance, vent the furnace throughawall thatexperiencesthe leastexposuretowinterwinds.

• The vent termination shall be located at least 3 ft.horizontallyfromanyelectricmeter,gasmeter,regulatorandanyreliefequipment.ThesedistancesapplyONLYto U.S. installations. In Canada, CSA B149.1 takesprecedenceovertheseinstructions.

• Donot install thevent terminalsuchthatexhaust isdirected into window wells, stairwells, under decksorintoalcovesorsimilarrecessedareas,anddonotterminateaboveanypublicwalkways.

• Ifventinghorizontally,sidewallventkitsareavailableaccordingtothepipediametersizeoftheinstallation.For3inchpipe,usekit#904347.Faceplatekit#902375isalsoavailablefor3inchhorizontalventing.Please follow the instructions provided with the kits.

• Concentricventterminationkitsareavailableforusewiththesefurnaces.For3inchpipeusekit#904953.Please follow the instructions provided with the kit.

• WhentheventpipemustexitanexteriorwallclosetothegradeorexpectedsnowlevelwhereitisnotpossibletoobtainclearancesshowninFigure1,arisermaybeprovidedasshowninFigure3.Insulationisrequiredtopreventfreezingofthissectionofpipe.SeeTable3(page10)forventfreezingprotection.

OutdoorTerminations-VerticalVentingTerminationspacingrequirementsfromtheroofandfromeachotherareshowninFigure4.Theroofpenetrationmustbeproperlyflashedandwaterproofedwithaplumbingroofbootorequivalentflashing.Ventandcombustionairpipingmaybeinstalledinanexistingchimneywhichisnotinuseprovidedthat:

• Boththeexhaustventandairintakerunthelengthofthechimney.

• Thetopofthechimneyissealedandweatherproofed.• The termination clearances shown in Figure 4 are

maintained.• Noothergasfiredorfuel-burningequipmentisvented

throughthechimney.

12” min. to maximum

expected snow level

(both pipes)

90° Elbow

Exhaust vent

option B

Exhaust vent

option AMounting kit faceplate

secured to wall with screws

(both pipes)

Combustion

air inlet

Exhaust vent

option C

18” Min.

36” Max.

8” Min.

36” Max.

(all positions)

Figure1.Inlet&ExhaustPipeClearances

Note 2

Mechanical draftvent terminal

Direct ventterminal

50,000 Btuhor less

Forced air inlet

Direct ventterminal - more

than 50,000 Btuh

Mechanical

draft vent

terminal

Mechanical draft vent terminal

Less

than

10 ft.

3 ft.

NOTES:1. All dimensions shown are minimum requirements.2. Exterior vent terminations must be located at least 12” above the maximum expected snow level.

Note 2

4 ft

4 ft

12 in.

12 in.

9 in.

Note 2

Figure 2. Vent Locations

Support

NOTE: Vent Configuration to Provide 12" Minimum height above Snow Level.

1/2" ArmaflexInsulation orEquivalent(if required)

12" AboveMaximumExpected

Snow Level

19" Max.(See Note)

Outside Wall

Figure 3. Alternate Horizontal Vent Installation

Figure 4. Vertical Vent Termination

Com

bust

ion

Air

Exh

aust

Ven

t

12” Above MaximumExpected Snow Level

(Both pipes)

Elbows on the combustion air inlet must be positioned pointing

away from the exhaust vent.

8" Min.

36" Max.

Plumbing Vent Roof Boot(Both Pipes)

10

ExistingInstallationsWhenanexistingfurnaceisremovedfromaventsystemservingotherappliances,theexistingventsystemmaynotbesizedproperlytoventtheremainingappliances(example: water heater). An improperly sized ventingsystemcanresultintheformationofcondensate,leakage,orspillage.Theexistingventsystemshouldbecheckedtomakesure it is incompliancewithNFGCandmustbebroughtintocompliancebeforeinstallingthefurnace.

NOTE: Ifreplacinganexistingfurnace,itispossibleyouwillencounteranexistingplasticventingsystemthatissubjecttoaConsumerProductSafetyCommissionrecall.ThepipesinvolvedintherecallareHighTemperaturePlasticVent(HTPV). If your venting system contains these pipesDO NOT reuse this venting system!Thisrecalldoesnotapplytootherplasticventpipes,suchaswhitePVCorCPVC.CheckfordetailsontheCPSCwebsiteorcalltheirtoll-freenumber(800)758-3688.

Ventilaire III or IV Air Quality PackageTheVentilaireairqualityaccessorypackagesareavailabletomeettheventilationrequirementsasoutlinedinH.U.D.StandardPart3280.103(b)(2).Thesepackagesintroduceoutdoorair into the livingspaceduring furnacebloweroperation.TheVentilAireIValsoservestoexhaustmoistand/orhotairfromtheatticspace.SeeFigure5fortypicalinstallation.Completeinstallationinstructionsaresuppliedwitheachairqualitypackage.

VentilAireIII

VentilAireIV

Figure 5. VentilAire III & IV

VentFreezingProtection

CAUTION:Whentheventpipeisexposedtotemperaturesbelow freezing (i.e., when it passes through unheated spaces, chimneys, etc.) the pipe must be insulated with 1/2 inch thick sponge rubberinsulation,Armaflex-typeinsulationorequivalent. Insulating pipe is important to avoid condensate icing.

• Table3liststhemaximumlengthoffluepipethatcantravelthroughanunconditionedspaceoranexteriorspace. The total vent length must not exceed thelengthsnotedintheTable.ForCanadianinstallations,pleaserefertotheCanadianInstallationCode(CAN/CGA-B149.1or2)and/orlocalcodes.

• Forextremelycoldclimatesorforconditionsofshortfurnace cycles (i.e. set back thermostat conditions)thelast18inchesofventpipecanbereduced.It isacceptabletoreducefrom3”to2-1/2”or,3”to2”ifthetotalventlengthisatleast15feetinlength,andtheventlengthiswithintheparametersspecifiedinTable2 (page 8).The restriction should be counted as 3equivalentfeet.Smallerventpipesarelesssusceptibletofreezing,butmustnotbeexcessivelyrestrictive..

• To prevent debris or creatures from entering thecombustionsystem,aprotectivescreenmaybeinstalledoverthecombustionairintakeopening.Thescreensholesizemustbelargeenoughtopreventairrestriction.

Winter DesignTemperature

MaximumFluePipeLength(FEET)inUnconditioned&ExteriorSpaces

Without Insulation With Insulation*

20 45 70

0 20 70

-20 10 60

*NOTE:Insulationthicknessgreaterthan3/8inch,basedonanRvalueof3.5(ftxFxhr)/(BTUxin.)

Table 3. Vent Protection

11

CIRCULATING AIR REQUIREMENTS

WARNING:Do not allow combustion products to enter the circulating air supply. Failure to prevent the circulation of combustion products into the living space can create potentially hazardous conditions including carbon monoxidepoisoning that could result in personal injury or death.

All supply ducts must be secured to the furnace with sheet metal screws and adequately sealed. When supply air is provided through the bottom of the unit, the joint between the furnace and the plenum must be air tight.

The surface that the furnace is mounted on must provide sound physical support of the furnace with no gaps, cracks or sagging between the furnace and the floor or platform.

Supply air ducts must not be connected to any other heat producing device such as a fireplace insert, stove, etc. This may result in fire, explosion, carbon monoxide poisoning,personal injury, or property damage.

Plenums & Air DuctsThisunitisdesignedonlyforusewithabottomsupplyduct and must be installed in accordance with thestandards of the National Fire Protection AssociationStandard for Installation of Air Conditioning Systems(NFPA90A),StandardforInstallationofResidenceTypeWarmAirHeatingandAirConditioningSystems(NFPA90B),andallapplicablelocalcodes.NFPApublicationsare available by writing to: National Fire ProtectionAssociation,BatterymarchPark,Quincy,ME02269orgotowww.NFPA.orgontheweb.

• DesigntheairductsaccordingtomethodsdescribedbytheAirConditioningContractorsofAmerica(ACCA).

• Air ducts must be aluminum, tin plate, galvanizedsheetsteel,orotherapprovedmaterialsforoutletorreturnairducts.Snap-LockorPittsburgh-Lockseamsarepreferred.Allothertypesofseamsmustbemadetighttopreventleakage.

• It isgoodpractice tosealallconnectionsand jointswith industrial grade sealing tape or liquid sealant.Requirements for sealing ducts vary from region toregion. Consult with local codes for requirementsspecifictoyourarea.

• Gaspipingmustnotruninorthroughanyoftheairductsystem.

• Hollow spaces used as ducts or plenums forenvironmentalairmaycontainmineral-insulatedmetalsheathedcable,aluminumsheathedcable,electricalmetallic tubing, rigid metal conduit, flexible metalconduit(nottoexceed4ft),ormetal-cladcables.Wiringmaterials,fixtures,aretobesuitablefortheexpected

ambienttemperaturestowhichtheywillbesubjected.WiringmaterialslocatedinthereturnductsystemshallconformtoArticles300-22oftheNationalElectricalCode(ANSIC1/NFPA-70).

• All ductworkpassing through unconditioned spacemust be properly insulated to minimize duct lossesand prevent condensation. Use insulation with anoutervaporbarrier.Refertolocalcodesforinsulationmaterialrequirements

• Airconditioningsystemsmayrequiremoreductregisterandopenlouverareatoobtainnecessaryairflow.UseNORDYNE’s certiductprogram todetermineproperductsizesforairconditioning.

• Noncombustiblepanshavingoneinchupturnedflangesare locatedbeneathopenings inafloor returnductsystem.

Supply Air Connections• Forproperairdistribution,thesupplyductsystemmust

be designed so that the static pressure measuredexternaltothefurnacedoesnotexceedthelistedstaticpressureshownonthefurnaceratingplate.Thesupplyairmustbedeliveredtotheheatedspacebyduct(s)securedtothefurnacecasing,runningfulllengthandwithoutinterruption.

• Duct system must be designed so that no supplyregistersarelocatedinductsystemdirectlybelowthefurnace.

• Location, size, and number of registers should beselectedonthebasisofbestairdistributionandfloorplanof thehome.ThreetypicaldistributionsystemsareshowninFigure6

A Single trunk duct

B Dual trunk ductw/crossover connector

CTransition duct w/branches

Figure 6. Typical Supply Duct Systems

Return Air Connections• M7furnaceswithmodelnumbersendinginAWorBW

arefactoryconfiguredforthereturnairtoflowthroughthe front louvered door.The return air may also beattachedtoeithersideofthefurnacecabinetusingafieldinstalledkit(PN904003).ThelocationandsizeofthesideandtopreturnairconnectionsareshowninFigures23&24(pages29&30).Thefiltersizeforthesidereturnairis20”x20”x1”.

• ModelnumbersendinginBWTarefactoryconfiguredforthereturnairtoenterthetopofthefurnace.SeeFigure25(page31).NOTE:Fortopreturninstallations,

12

anexternalorin-wallfiltermountisrecommended.Thereturnductshouldbesizedtoprovideadequateairflow

• For floor returnsystems, themanufacturedhousingmanufacturerorinstallershallaffixaprominentmarkingonorneartheappliancewhereitiseasilyreadwhentheclosetdoorisopen.Themarkingshallread:“CAUTION,HAZARDOFASPHYXIATION.DONOTCOVERORRESTRICTFLOORRETURNAIROPENING.”

• Returnairopeningsshouldnotbelocatedtodrawairdirectlyfromabathroom.

• Materialslocatedinthereturnductsystemshallhaveaflamespreadclassificationof200orless.

• Thetotalfreeareaoftheopeningsinthefloorortheceilingregistersservingthereturnairductsystemmustnotbenotlessthan352in2(2,270cm2).Atleastoneregistershouldbelocatedwhereitisnotlikelytobecoveredbycarpeting,boxesandotherobjects.

Closet & Alcove Installations

WARNING:Failure to comply with the the following instructionsmayresultinfire,asphyxiationorcarbonmonoxidepoisoning.

For proper air circulation, closet installations requirea return air grill installed in the door or side wall thatexchangeswiththelivingareaofthehome.Apartiallylouvereddoormayalsobeusedacrosstheopening.Grillesplacedinasidewallrequirea6”clearancefromthewallto thefurnacesothat theairmayenter thefrontgrilleofthefurnace.Allreturnairsystems,includingthefloorandceilingsystems,mustmeetthefollowingconditions:• Thereturnairopening,regardlessofitslocationinthe

closet,mustnotbesmallerthansizespecifiedonunitdatalabel.Iflocatedinthefloor,theopeningmustbeprovidedwithameansofpreventing its inadvertentclosurebyflatobject(s)placedovertheopening.

• Thecross-sectionalareaofthereturnductsystem(infloororceiling)leadingintotheclosetmustnotbelessthan235in2(1,516cm2).

CAUTION:HAZARD OF ASPHYXIATION: Negative pressure inside the closet, with closet door closed and the furnace blower operating on high speed, shall be no more negative than minus 0.05 inch water column.

• Testthenegativepressureintheclosetwiththeair-circulatingfanoperatingathighspeedandtheclosetclosed.Thenegativepressureintheclosetmustnotbelessthanminus0.05incheswatercolumnwiththeclosetdoorclosedandthefanoperatingathighspeed.Thenegativepressureistobenomorenegativethanminus0.05”watercolumnasthisindicatesadirtyfilterorarestrictedreturnairsystem.

• Forclosetinstallationwithlessthan6”frontclearance,butnot less than1”,a louvereddoormustbeusedhavingaminimum250in2(1,613cm2)freeareaopeningdirectlyinlinewithopeningsinthefurnacedoor.For1”clearancefromfurnace,useafullylouvereddoorwithatleast400in2(2,580cm2)offreeairflowarea.

Furnace Filter

WARNING:Never operate the furnace without a filter in place. Accumulating dust in the return air can build up on internal components, resulting in loss of efficiency, equipment damage, and possible fire.

• M7RLfurnaceswithAWorBWsuffixesaresuppliedwithasingleairfilterwhenshippedfromthefactory.Accessingthefilterdoesnotrequiretoolsandcanbeeasilyremovedfromtheinsideoftheaccessdoor.Thefilterissecuredtothedoorwitharetainingbracket.Itisrecommendedthatthefilterbecleanedorreplacedmonthly.Newlybuiltorrecentlyrenovatedhomesmayrequiremorefrequentchanginguntiltheconstructiondusthasminimized.

• Replacementfiltersareavailableatmostlocalretailers.Inspectfiltersfrequentlyandreplacewhennecessarywithfilterofsamedimensionalsize.Filtersdesignedtoremovesmallerparticlessuchaspollen,mayrequireadditionalmaintenance.

DampersAnautomatedshutoffdamperisrequiredwhenthehomeis air conditioned by a self-contained unit. A damperis required toprevent chilledair fromflowingover thefurnaceheatexchanger.Thisdamperisdesignedtofitinthefeederductcavity,directlyunderthefurnace.Forproperinstallation,refertotheinstructionsprovidedwiththedamper.Seereplacementpartslistprovidedonline.

Acoustical TreatmentsDamping ducts, flexible vibration isolators, or pleatedmedia-stylefiltersonthereturnair inletof thefurnacemaybeusedtoreducethetransmissionofequipmentnoiseeminatingfromthefurnace.Thesetreatmentscanproduceaquieterinstallation,particularlyintheheatedspace.However,theycanincreasethepressuredropintheductsystem.Caremustbetakentomaintainthepropermaximumpressureriseacrossthefurnace,temperatureriseandflowrate.Thismaymeanincreasingtheductsizeand/orreducingtheblowerspeed.ThesetreatmentsmustbeconstructedandinstalledinaccordancewithNFPAandSMACNAconstructionstandards.Consultwithlocalcodesforspecial requirements.Forbestsoundperformance,install all the needed gaskets and grommets aroundpenetrationsintothefurnace,suchasforelectricalwiring.

13

FURNACE INSTALLATIONNOTE: TheseInstallationproceduresaresuggestedfortypical furnace installations. Since each installation isdifferent, the sequence of instructions may differ fromtheactualinstallation.OnlyqualifiedHVACtechniciansshouldinstallthisfurnace.

The installermustbe familiarwithandcomplywithallcodes and regulations applicable to the installation ofthese heating appliances and related equipment. Intheabsenceof localcodes, the installationmustbe inaccordancewiththecurrentprovisionsofoneormoreofthefollowingstandards.

• FederalManufacturedHomeConstructions&SafetyStandard(H.U.D.Title24,Part3280.707[a][2])

• AmericanNationalStandard(ANSI-119.2/NFPA-501C)forallrecreationalvehicleinstallations.

• AmericanNationalStandard(ANSI-Z223.1/NFPA-54)and/orCAN/CSAB149forallgas-firedfurnacemodels.

• American National Standard (ANSI-Z95.1/NFPA-31)and/orCSAB139foralloil-firedfurnacemodels.

• AmericanNationalStandard(ANSI-C1/NFPA-70)and/or CSA 22.1 Canadian Electric Code Part 1 for allelectricalfieldwiring.

• UnitshavebeenresearchedunderstandardsUL307A&B,UL727-1999,ANSIZ21.47b/CSA2.3b-2008,andCSAB140.10.

About The FurnaceTheM7RLfurnaceisdesignedonlyforindoorinstallationsand can be readily connected to the high static ductsystemofahome.Unitsareapprovedforsingle/multistoryresidentialormobile/modular/manufacturedstructuresinfreestanding/closet/alcovedownflowonlyconfigurations.

This appliance will provide many years of safe anddependable comfort, providing it is properly installedandmaintained.Abuse,improperuse,and/orimpropermaintenancecanshorten the lifeof theapplianceandcreateunsafehazards.Pleasereadallinstructionsbeforeinstallingtheunit.

Approved installation, operation, and maintenance ofthis appliance must be in accordance with the listedspecificationscontainedintheseinstructionsandotherdocumentssuppliedwiththefurnaceand/oroptionalairconditioningequipment.Unlessitisnoteddifferentlyinthismanual,onlyusefactoryauthorizedkitsandaccessoriesonthisappliance.Refertolocalauthoritieshavingjurisdictionforfurtherinformation.

Before You Install this Furnace√ Thisequipment issecurelypackagedat the timeof

shipmentanduponarrivalshouldbecarefullyinspectedfordamagepriortoinstallingtheequipmentatthejobsite.Claimsfordamage(apparentorconcealed)shouldbefiledimmediatelywiththecarrier.

√ Checktheelectricalsupplyandverifythepowersupplyisadequateforunitoperation.Thesystemmustbewired

andprovidedwithcircuitprotectioninaccordancewithlocalbuildingcodes.Ifthereisanyquestionconcerningthepowersupply,contactthelocalpowercompany.

√ Verify theairdeliveryof the furnace isadequate tohandlethestaticpressuredropofthecoil,filter,andductwork.

Locating the Unit• Thedimensionsoftheroomoralcovemustbeableto

accommodatetheoverallsizeoftheunitandrequiredclearancestocombustiblematerialslistedinTable1(page5).Access forpositioningandservicingmustalsobeconsideredwhenlocatingtheunit.Todeterminethe required clearances needed for installation andcombustiblematerials,refertoFigures23-25(pages29-31)foroveralldimensions.

• The furnace must be installed on a solid surfaceand must be level front-to-back and side-to-side atinstallation.Thesurfacethatthefurnaceismountedonmustprovidesoundphysicalsupportoftheunit.

• Thefurnaceshouldbeinstalledasclosetothecenteroftheairdistributionsystemaspossibleandattachedtoaproperly installedductsystem.Do not use the back of the furnace for return air. Seepages11-12forcirculatingrequirements.

• The furnace must be installed so that all electricalcomponentsareprotectedfromwater.

• TheplenumattachedtotheA/Ccoilboxandductworkwithin 3 ft. of the furnace must be installed so thatsurfacesareatleast1/4”fromcombustibleconstruction.

• Wheninstalledinaresidentialgarage,thefurnacemustbepositionedso theburnersand thesourceof theignitionarelocatednolessthan18inchesabovethefloorandprotectedfromphysicaldamagebyvehicles.

• This furnace iscertified foruseonwoodflooringorsupports,butmustnotbeinstalleddirectlyoncarpeting,tile,oranycombustiblematerialotherthanwoodflooring.NOTE:ThefurnacemaybeinstalledoncombustibleflooringwheninstalledonaNordyneductconnector(Figure7).This factorysuppliedaccessorymustbeinstalledinthefloorcavityandattachedtothesupplyairductbeforethedownflowfurnaceisinstalled.

• The furnace must be installed upstream from arefrigerationsystem.

NOTES: With reducer installed: Opening to duct is 10-1/4” x 13-1/4”. With reducer removed: Opening to duct is 13-1/4” x 13-1/4”.

REDUCER(See Notes)

FELT-SEAL

SPACERS

DUCT CONNECTOR TABS

FIBERGLASSINSULATION

Figure 7. Duct Connector

14

14 1/2”

14 1

/2”

Floor Cut-Out for Duct Connector

FU

RN

AC

E C

AB

INE

T O

UT

LIN

E

Optional floor cutouts for gas,condensate, or AC linesets

(3 1/2 x 1 1/2 - 2 places)

21 5/8TYP.

1/2 TYP.

REAR WALL OF CLOSET OR ALCOVE

2 1/4

16 3/4

Furnace Door

1 1/2 TYP.CL

20"

2 3/4

Figure 8. Floor Cutout Dimensions

CEILING CUT-OUTS FORVENT & COMBUSTION AIR

CL

20"

23 3

/4"

REAR WALL OF CLOSET OR ALCOVE

FURNACEOUTERDOOR

FU

RN

AC

E O

UT

LIN

E

21 7

/8

2 1/2 2 3/4

CL

CLCL

COMBUSTIONAIR INLET

EXHAUSTVENT

Figure9.CeilingCut-OutDimensions

“X”FLOOR OPENING

FLOORCAVITY

SUPPLY AIR DUCT

If Floor Cavity(“X”) is:

Duct ConnectorType & Part Number

Finger Tab Screw Down

7/8”(22) 901987A 904008

2”(51) 901988A 904009

4-1/4”(108) 901989A 904010

6-1/4”(159) 901990A 904011

8-1/4”(210) 901991A 904012

10-1/4”(260) 901992A 904013

12-1/4”(311) 901993A 904014

NOTE:DimensionsshownasInches(Millimeter)

Table 4. Duct Connector Sizes

Locating&CuttingFloorOpeningsIMPORTANT NOTE: Cut-outs in the floor, must becarefully located to avoid misalignment of the furnace.Tolocatestandardducts,seeFigure8.Forroundducts,seeFigure9.

1. Measure from the rearwalloralcoveandmark thecenterlineofthecut-outonthefloor.Usingthecenterlineasastartingpoint,drawtherestoftheductcut-outtothedimensionsshowninFigure8.

2. Cutouttheflooropeningtowithin1”oftheactualcutoutdrawn.

3. Measurefromthetopofthefloordowntothetopofthesupplyairducttoobtainthedepthofthefloorcavity.NOTE: Thedepthofthefloorcavityshownas“X”inTable4willdeterminethecorrectductconnector.

4. Determinewhichductconnectortousefromthetable.6. Measureanddrillgasholeandcutoutforcoolingcoil

(ifapplicable).SeeFigures8or9.

Locating&CuttingCeilingOpeningsIMPORTANTNOTE:Cut-outsintheceilingandroofmust be carefully located to avoid misalignment of the furnace, combustion air piping, and vent piping.See Figure 9.

1. Measure from the rearwalloralcoveandmark thecenterlinesofbothcut-outsintheceiling.

2. Usingthecenterlinesasastartingpoint,drawtherestofthecut-outstothedimensionsshowninFigure9.

3. Cutouttheceilingopenings.

Installing Finger Tabbed Duct ConnectorsThestandardductconnectorisdesignedforuseonducts12”inwidth.Howeverductsnarrowerthan12”maynotallowsufficientclearancesforthistypeofinstallation.Foranalternateinstallationmethod,seepage15.

1. Center theduct connector in theflooropeningwithbottomtabsrestingontopofthesupplyairduct.

2. Markthecut-outareaonthesupplyairductbytracingaroundtheconnectortabs(Figure10,page15)oftheductconnector.

3. Removetheductconnectorandcutoutthemarkedareaofthesupplyairduct1/16”largertheactualcutoutdrawn.

4. Installtheductconnectorbackintheflooropeningwiththebottomtabsextendingintothesupplyairduct.

5. Installthemountingplate(Figure10)underthebacksideof theductconnector.Align thescrewholes inbothcomponents.

6. Securetheductconnectorandthemountingplatetothewoodfloorwithappropriatesizescrews.

15

Tabs slide into slotsin back of furnace

MountingPlate

Duct Connector

Supply

Air Duct

Hole forGas Line Wood Floor

ConnectorTabs

Duct Connector

SupplyAir Duct

Bend tabs tightly against supply air duct

Figure 10. Finger Tabbed Duct Connector

Tabs slide into slotsin back of furnace

MountingPlate

Screw DownDuct Connector

Supply

Air Duct

Hole forGas Line Wood Floor

Figure13.Screw-DownDuctConnector

7. Bend the connector tabson thebottomof theductconnectorupwardsandas tightaspossibleagainstthesupplyairduct.SeeFigure11(page15).

8. Sealallconnectionswithindustrialgradesealingtapeor liquid sealant. NOTE: Requirements for sealingductworkvaryfromregiontoregion.Consultwithlocalcodesforrequirementsspecifictoyourarea.

NarrowDuctAttachment-Option1Thesalternateattachmentmethodsmaybeusedtoinstalla furnace duct connector to narrow metal ductwork ifinsufficientclearancesprevent thebendingof theductconnectortabsatthesideoftheduct.1. SelectOptionAorOptionBinFigure11andcutthe

topofthesupplyairduct.Removemetalflapsfromtheduct(shadedarea)ifOptionAisselected.

2. Foldtheductflapsuptoformanopeningfortheductconnector(appliestoOptionsAorB).

3. Installtheductconnectorwiththebottomtabsextendingintothesupplyairduct.

4. Bend the tabson thebottomof theduct connectorupwardsandastightaspossibleagainsttheremovedendsofthesupplyairduct.

5. Form theductflapsupagainst thesideof theductconnectorastightaspossible.SeeFigure11.

6. Securetheductconnectorflapstothesupplyairductwithstaples(3minimum)or ifa2xblock/joist isnotprovided,usesheetmetalscrews(2minimum).

NOTE:Theductconnector tabsmaybeattachedtotheairductwithsheetmetalscrewsorothersuitablefastenersaslongastheductconnectorandtheairductaresecurelyattached.

7. Sealallconnectionswithindustrialgradesealingtapeorliquidsealant.

NOTE: Requirements for sealing ductwork varyfrom region to region. Consult with local codes forrequirementsspecifictoyourarea.

NarrowDuctAttachment-Option2Thesalternateattachmentmethodsmaybeusedtoinstalla furnace duct connector to narrow metal ductwork ifinsufficientclearancesprevent thebendingof theductconnectortabsatthesideoftheduct.1. Cutandremovethetopofthesupplyairductasshown

inFigure12.2. Installtheductconnectorwiththebottomtabsextending

intothesupplyairduct.3. Bend the tabson thebottomof theduct connector

upwardsandastightaspossibleagainstthesupplyairduct(Figure12).

4. Securetheductconnectortabstothesupplyairductwith staples (3 minimum) or sheet metal screws (2minimum).

Figure11.NarrowAirDucts-Option1

CuttingOption A

Supply Air Duct

Fold duct flap here

Rem

ove

this

Fla

p Cut Here

Cut Here

Cut Here

Cut Here C

ut H

ere

Cut

Her

e

Cut Here

Cut H

ere

Cut H

ere

Fold Flap Here

NarrowDuct

NarrowDuct

Finger Tabs

Secure Flaps with Staplesor sheet metal screws

Fold duct flapsinto duct connector

Rem

ove

this

Fla

p

Fold Flap Here

CuttingOption B

Fold duct flap here

Supply Air Duct

NarrowDuct

Finger TabbedDuct Connector

Secure finger tabs toside of air duct with staples

or sheet metal screws

Bend tabs tightly against supply air duct

Supply Air Duct Cut out & remove

Figure12.NarrowDucts-Option2

16

Figure 14. Round Duct Connector

Tabs slide into slotsin back of furnace Mounting

Plate

14” RoundDuct Connector

Optional Holefor Gas Line

Optional Holefor Gas Line

InstallingScrew-DownDuctConnectors1. Applyabeadofcaulking,mastic,orotherapproved

sealantaroundbottomsideof1/2”flangeandrestrictorplate(whenapplicable).

2. Locatethescrewdownductconnectorovertheductandcarefullyloweritintoplace.

3. Securetheductconnectortothefloorusingflatheadscrewsornails.NOTE:Makesuretheductconnectorflangesstayincontactwiththeduct.

4. Securetheplenumtotheductusingsheetmetalscrewsmakingsureatightsealismadebetweentheductandtheductconnector.NOTE:Additionalscrewsmaybeaddedifrequired.

5. Cutawayalongedgeofflangeallowingthecentertodropintotheduct.NOTE:Removesectionofductwithcaution,asedgeswillbesharp.

Round Duct Connector Installation1. Installandcentertheductconnectorintheflooropening.2. Installthemountingplate(Figure14,page16)under

thebacksideoftheductconnector.NOTE:Makesurethescrewholesarealignedinbothcomponents.

3. Using appropriate size screws, secure the ductconnectorandthemountingplatetothewoodfloor.

4. Connecttheroundsupplyducttotheundersideoftheduct connector andsecure themwith field suppliedsheetmetalscrewsorappropriateclamps.

5. Sealallconnectionswithindustrialgradesealingtapeorliquidsealantasrequired.

NOTE: Requirements for sealing ductwork varyfrom region to region. Consult with local codes forrequirementsspecifictoyourarea.

Installing the FurnaceSidesandbackofthefurnacemaybeenclosedbywallframingsuchasinaclosetoralcove.Thedimensionsofthe roomoralcovemustbeable toaccommodate theoverallsizeofthefurnaceandtheinstallationclearancesoutlinedonpage5andFigures1-4(page6).ThefurnaceshallbeappropriatelyconnectedtothesupplyandreturnairdistributionsystemasshowninFigures23-25(pages29-31).

1. Remove furnace outer door(s) and bottom fuel lineknockout.

2. Placefurnaceontoductconnectorandcenterwithflooropening.

3. Slideontomountingplate.(Bottomrearslotsonfurnaceshouldengagewithmountingplatetabs.)

4. Secure front with one (1) fastener at each corner(Figures14or15).

NOTE:Additionalfastenersmaybeusedatrear,sidesorthroughdoorframe,asdesired,tosecurefurnacetoclosetoralcoveframing.

Condensate Drainage

WARNING:The condensate produced by the furnace must be drained. Do not connect a water supply to the drainage hose of the furnace.

NOTE:Thecondensatedrainshouldbeprotectedfromfreezingwheninunheatedspaces.Thefurnaceissuppliedwithaninternalcondensatedraintrap.

CAUTION:Do not install additional traps in the condensate drain.

Thecondensatedrainmayexitthroughtheleftorrightslotsinthebottomofthefurnace(Figure16).Makesuretheflexibledrainhoseisnotkinked.

Thecondensateshoulddrainfromtheplasticcollectorboxasdropletsorasmallstream.Ifyounoticethefurnacehasoperatedformorethan5minuteswithoutdrainingortheredstatuslightonthecontrolboardispulsinga2-blinkcodefollowthestepsbelow.1.Remove thecollectorboxsoft tube (Figure16)and

verify the exit from the collector box is clear of anydebrisorobstructions.

2.Replacethistubeandverifythefittotheheaderspoutis air tight. Air will be drawn into the header if thisconnectionisnottight.

3.Checkothertubeconnectionsalongthedrainsystem.Verifythatallareairtight.

17

Figure 16. Condensate Drainage

B CabinetsTall & Top Return Air Type

Short A Cabinet

Optional Exits for Condensate Drain Lines

Collector Box DrainInline

Drain

Optional Exits for Condensate Drain Lines

MTG. PLATE TABS

SLIDE FURNACE ALL THE WAY BACK ONTO MTG. PLATE

SUPPLY AIR DUCT

Knockout Over Holes

SECURE FURNACE WITH2 FASTENERS IN FRONT

Figure 15. Cabinet Furnace on Supply Air Duct

FIRE OR EXPLOSION HAZARD•Failuretofollowsafetywarningsexactlycould result in serious injury or property damage.

•Installationandservicemustbeperformedby a qualified installer, service agency or the gas supplier.

• Donotstoreorusegasolineorotherflammable vapors and liquids in the vicinity of this or any other appliance.

WHAT TO DO IF YOU SMELL GAS•Donottrytolightanyappliance.•Donottouchanyelectricalswitch;donot

use any phone in your building.•Leavethebuildingimmediately.•Immediatelycallyourgassupplierfroma neighbor’s phone. Follow the gas supplier’s instructions.

•Ifyoucannotreachyourgassupplier,callthe fire department.

WARNING:

RISQUE D’INCENDIE OU D’ EXPLOSION• Lenon-respectdesavertissementsdesécurité

pourrait entraîner des blessures graves, la mort ou des dommages matériels.

• L’installationetl’entretiendoiventêtreeffectuéspar un installateur qualifié, un organisme de service ou le fournisseur de gazstaller, service agency or the gas supplier.

• Ne pas entreposer ni utiliser de l’essence nid’autres vapeurs ou liquides inflammables dans le voisinage de cet appareil, ni de tout autre appareil.

QUE FAIRE S’IL Y A UNE ODEUR DE GAZ• Nepastenterd’allumeraucunappareil.• Ne toucher à aucun interrupteur électrique;

n’utiliser aucun téléphone dans le bâtiment.• Évacuerl’immeubleimmédiatement.• Appelerimmédiatementlefournisseurdegazen

employantletéléphoned’unvoisin.Respecteràla lettre les instructions du fournisseur de gaz.

• Sipersonnenerépond,appeler leservicedesincendies.

AVERTISSEMENT:

GAS SUPPLY & PIPING

18

• All gas piping must be installed in compliance with local codes and utility regulations. In the absence of local codes the gas line installation must comply with the latest edition of the Federal Manufactured Home Constructions & Safety Standard (H.U.D. Title 24, Part 3280.707[a][2]), National Fuel Gas Code (ANSI Z223.1) or (CAN/CGA B149.1 or .2) Installation Codes.

• Some local regulations require the installationofamanualmainshut-offvalveandgroundjointunionexternaltothefurnaceasshowninFigure17 (page 18).The shut-off valve should be readilyaccessible for service and/or emergency use. Consult the local utility or gas supplier for additional requirements regarding placement of the manual maingasshut-off.

• Gaspipingmustneverruninorthroughairducts,chimneys, gas vents, or elevator shafts.

• Compoundsusedonthreadedjointsofgaspipingmust be resistant to the actions of LP propane gas.

• Themaingasvalveandmainpowerdisconnecttothe furnace must be properly labeled by the installer in case emergency shutdown is required.

• Flexiblegasconnectorsarenotrecommendedforthis type of furnace but may be used if allowed by local jurisdiction. Only new flexible connectorsmay be used. Do not use a connector which has previously serviced another gas appliance.

• Adriplegshouldbeinstalledintheverticalpiperun to the unit if not entering the furnace through the floor.

Table9(page33)listsgasflowcapacitiesforstandardpipesizesasafunctionoflengthintypicalapplicationsbasedonnominalpressuredropintheline.

Thefurnaceisinstalledwithabottomgasentry.Whenconnectingthegassupply,provideclearancebetweenthegassupplylineandtheentryholeinthefurnacecasingtoavoidunwantednoiseand/ordamagetothefurnace.TypicalgashookupsareshowninFigure17.

FIRE OR EXPLOSION HAZARDFailuretofollowsafetywarningsexactlycouldresult in serious injury or property damage.

Never test for gas leaks with an open flame. Use a commercially available soap solution made specifically for the detection of leaks tocheckallconnections.Afireorexplosionmay result causing property damage, personal injury or loss of life.

WARNING:

RISQUE D’INDENDIE OU D’EXPLOSION

Le non-respect des avertissements desécurité pourrait d’entraîner des blessures graves, la mort ou des dommages matériels.

Ne jamais utiliser une flamme nue por vérifier la présence des fuites de gaz. Pour la vérification de tous les joints, utiliser plutôt une solution savonneuse commerciale fabriquée spécifiquement pur la détection des fuites de gaz. Un incendie ou une explosion peut entraîner des dommagesmatériels, des blessures ou la mort.

AVERTISSEMENT:

Shut-OffValve

Elbows4

Gas Valve

Gas Valve

Shut-OffValve

Elbows

A Cabinet (Short)

B Cabinets(Tall & Top Return Air Type)

Alternate FuelLine Entrance

Alternate FuelLine Entrance

Alternate FuelLine Entrance

Figure 17. Typical Gas Connections

Leak Check

After the gas piping to the furnace is complete, allconnectionsmustbetestedforgasleaks.Thisincludespipeconnectionsatthemaingasvalve,emergencyshutoffvalveandflexiblegasconnectors(ifapplicable).Thesoapandwatersolutioncanbeappliedoneachjointorunionusing a small paintbrush. If any bubbling is observed,the connection is not sealed adequately and must beretightened.Repeatthetighteningandsoapcheckprocessuntilbubblingceases.

IMPORTANT NOTE: When pressure testing gas supply lines at pressures greater than 1/2 psig (14 inch W.C.), the gas supply piping system must be disconnected from the furnace to prevent damage to the gas control valve. If the test pressure is less than or equal to 1/2 psig(14inchW.C.),closethemanualshut-offvalve.

19

High Altitude ApplicationHighaltitude conversionwith this furnacedependsontheinstallationaltitudeandtheheatingvalueofthegas.Installationofthisfurnaceataltitudesabove2,000feetshallbeinaccordancewithlocalcodes,orintheabsenceoflocalcodes,theNationalFuelGasCode,ANSIZ223.1/NFPA54orNationalStandardofCanada,NaturalGas&PropaneInstallationCodeCGAB149.1.Pleaseconsultyourlocalcodeauthority.

WARNING:The reduction of input rating necessary for high altitude installation may only be accomplished with factory supplied orifices. Do not attempt to drill out orifices in the field. Improperly drilled orifices may cause fire, explosion, carbonmonoxidepoisoning,personalinjuryordeath.

Thefurnacesareshippedfromthefactorywithorificesandgasregulatorsettingsfornaturalgasoperationatsealevelaltitudes.At2000feet,theNFGCrequiresthatthisappliancebederated4%foreach1000feetofaltitude.Forexample,theinputneedstobereduced8%at2,000feet,12%at3,000feet,etc.Thisderationisinreferencetotheinputrateandgasheatingvalueatsealevel.

Toderatethefurnacerequiresknowingtheheatingvalueofthegasattheinstallationsite.Heatingvaluesatparticularjobsitesvaryfortworeasons:

1.Thechemicalmixtureofthegasvariesacrossregionsandisexpressedasthe“sealevelheatingvalue”.

2.Theheatingvaluevariesbyaltitude.Forthisreason,especially inhighaltitudeareas, the localgasutilityspecifiestheheatingvalueattheresidence’sgasmeterasthe“localvalue”.

Foraddedflexibility, twotableshavebeenprovidedfornaturalgasinstallationswithhighorlowheatingvaluesatsealevel.Tables12&13(page34)containthemanifoldpressure and orifice sizes to use at various altitudes.Table 12 (HIGH) is for natural gas installations with aheatingvalueofmorethan1,000BtupercubicfootandTable13(LOW)isforlessthan1,000Btupercubicfoot.Todeterminewhichtabletouse:

1.Consult the localutility for the localheatingvalueatyourinstallationsite.

2.FromTable11(page34),findyourlocalheatingvalueas supplied by the utility company. Follow down thecolumnandstopatyouraltitudelevel.

3.IfyoursealevelheatingvalueisHIGH,useTable12orifit’sLOW,useTable13.Seeexample.

Afterchangingtheregulatorpressureortheorifices,itisrequiredthatyoumeasurethegasinputrate.Thismaybeaccomplishedintheusualway,byclockingthegasmeter

Converting to LP/Propane Gas at Altitudes between 0 & 10,000 FT.

WARNING:The furnace was shipped from the factory equipped to operate on natural gas. Conversion to LP / Propane gas must be performed by qualified service personnel using a factory supplied conversion kit. Failure to use the properconversionkitcancausefire,explosion,propertydamage,carbonmonoxidepoisoning,personal injury, or death.

ConvertingsinglestagevalvestoLP/Propanerequiresthe replacementof theburnerorificesandflipping theregulatorcaptothesidemarkedLP.TheendfacingupshouldnowreadLP.SeeFigure18.

InstallationExample

Elevation:.................................................. 5,000feetType of Gas:...........................................NaturalGasLocal Heating Value of Gas:..............................750

FromTable11,find750andfollowdownthecolumn,stopatthe5,000feetrow.TheheatingvaluelistedisLOW.Table13willbeusedtodetermineorificesizeandmanifoldpressure.

andusingthelocalgasheatingvalue.SeeVerifyingandAdjustingtheInputRatesection(page24).

IMPORTANT NOTE: Observe the action of the burners to make sure there is no yellowing, lifting or flashback of the flame.

InletPressure

Tap

ManifoldPressure Tap

On / Off Knob

TerminalConnectors

NAT N

AT

L

P

L

P

OROTHER SIDE

OF CAP

Adjusting Screw

Regulator Cap

Figure 18. Gas Valve

20

Table10(page34),providesthemanifoldpressureforaltitudesabove2,000feet.

WARNING:Shut off the gas supply at the manual gas shutoff valve, before disconnecting the electrical power. Afireorexplosionmayresultcausingpropertydamage, personal injury or loss of life. Failure to followthesafetywarningsexactlycouldresultin serious injury, death or property damage.

WARNING:To avoid electric shock, personal injury, or death, turn off the electric power at the disconnect or the main service panel before making any electrical connections.

WARNING:The reduction of input rating necessary for high altitude installation may only be accomplished with factory supplied orifices. Do not attempt to drill out orifices in the field. Improperly drilled orifices may cause fire, explosion, carbonmonoxidepoisoning,personalinjuryordeath.

RemovingTheBurnerOrifices1.Set thethermostat totheOFFposition,or its lowest

temperaturesetting.2.ShutOFFthegassupplyatthemanualshutoffvalve

locatedoutsideoftheappliance.3.Turnoffallelectricalpowertotheappliance.4.Removethedoorfromtheburnerboxbyremoving6

screws.5.TurnthegasvalveON/OFFknobtotheOFFposition.

SeeFigure18.6.Removethewiresfromtheterminalsofthegasvalve.7.Removethesupplygaspipingfromthegasvalveinlet.8.Carefullyremovefourscrewssecuringthegasmanifold

assemblytotheburnerassembly.SeeFigure19(page20).

9.Set the screws aside and remove the gas manifoldassemblyfromtheappliance.

10.Carefully remove the burner orifices from the gasmanifoldassembly.

11.Read the rating plate affixed to the appliance todetermineitsratedinput(Btu/hr)andthesizeofthefactoryinstalledorifices.

IMPORTANT: Before installing an orifice, check the side or face of the orifice for the drill number to ensure that it is the appropriate size.

12.InstalltheappropriateLP/Propanegasburnerorificesintothegasmanifoldassembly.NOTE:Theorificesareincludedwiththefurnace. Topreventcrossthreading,handtightentheorificesintothegasmanifoldassemblyuntilsnug,thentightenwithawrench.

13.UnscrewthegasvalvepressureregulatorcapmarkedNAT.InvertthecapsoLPfacesup.Reinstallthecapandtightenuntilsnug.MakesureLPisvisibleafterconversion.

WARNING:Do not use Teflon tape or pipe joint compound on the orifice threads. The hole in the orifice maybecomeblockedandcausefire,explosion,propertydamage,carbonmonoxidepoisoning,personal injury, or death.

14.Reinstall the gas manifold assembly to the burnerassemblywiththe4screws,thatwereremovedearlier.NOTE:It isimportantthatthecenteroftheorificesarealignedwiththecenteroftheburners.

15.Reinstalltheburnerboxdoorwiththe6screwsthatwereremovedearlierinstep4.

16.Reconnectthegaspipingtothegasvalveinlet.17.Reconnectthewirestothegasvalveterminals.

Gas Pressure AdjustmentMeasuringtheSupplyGasPressure1.TurnOFFthegassupplyatthemanualvalvelocated

ontheoutsideoftheunit.2.Usinga3/16”Allenwrench,removetheplugfromthe

inletpressuretap(INLETsideofgasvalve).SeeFigure18(page19).

3.Installan1/8”NPTpipethreadfitting,thatiscompatiblewithaManometerorsimilarpressuregauge.

4.ConnecttheManometerorpressuregaugetotheInletPressureTap.

5.TurnONthemaingassupplyatthemanualvalve.6.Checkandadjust the incominggas linepressure to

11.0-14.0inchesWaterColumnforLP/Propanegas.7.TurnOFFthegassupplyatthemanualvalve.8.DisconnecttheManometerorpressuregauge.

Figure 19. Orifice Removal

Burner Box

Orifice(X4)

Gas Valve

Gas Manifold

Burner BoxDoor

(X4)

(X6)

21

9.RemovetheNPTfittingandreinstalltheINLETpressuretapplug.Handtightentheplugfirsttopreventcross-threading.Tightenwith3/16Allenwrench.

Lighting&AdjustmentoftheAppliance

WARNING:FIRE OR EXPLOSION HAZARD

Failuretofollowsafetywarningsexactlycouldresult in serious injury or property damage.

Never test for gas leaks with an open flame. Use a commercially available soap solution made specifically for the detection of leaks to check allconnections.Afireorexplosionmayresultcausing property damage, personal injury or loss of life.

1.TurnONthemanualgasvalve,locatedontheoutsideoftheunittotheONposition.

2.Checkallgasconnectionsforleakswithasoapandwatersolution. If thesolutionbubbles there isagasleakwhichmustbecorrected.

3.Turnontheelectricalpowertotheappliance.4.TurnthegasvalveON/OFFknobtotheONposition.

SeeFigure18(page19).5.Setthethermostattoapointaboveroomtemperature

tobegintheheatingcycleofthefurnace.6.Checkthatthefurnaceignitesandoperatesproperly.

Refertotheinstallationinstructionsprovidedwiththeunitforthenormaloperatingsequence.

7.Afterignition,visuallyinspecttheburnerassemblytoensurethattheflameisdrawndirectlyintothecenteroftheheatexchangertube.Inaproperlyadjustedburnerassembly,theflamecolorshouldbebluewithsomelightyellowstreaksneartheouterportionsoftheflame.

NOTE:Theignitermaynotignitethegasuntilallairisbledfromthegasline.Iftheignitioncontrollocksout,turnthethermostattoitslowestsettingandwaitoneminutethenturnthethermostattoapointaboveroomtemperatureandtheigniterwilltryagaintoignitethemainburners.This process may have to be repeated several timesbefore theburnerswill ignite.After theburnersare lit,checkallgasconnectionsforleaksagainwiththesoapandwatersolution.

MeasuringtheManifoldPressureThemanifoldpressuremustbemeasuredbyinstallingapressuregauge(Manometer,MagnehelicMeter,etc.)totheoutletendofthegasvalveasfollows:1.Turnoffallelectricalpowertotheappliance.2.ShutOFFthegassupplyatthemanualshutoffvalve

locatedoutsideoftheappliance.3.Using a 3/16” Allen wrench, remove the manifold

pressuretappluglocatedontheoutletsideofthegasvalve.SeeFigure18(page19).

4.Installan1/8”NPTpipethreadfitting,thatiscompatiblewithaManometerorsimilarpressuregauge.

5.Connect the Manometer or pressure gauge to themanifoldpressuretap.

6.Settheroomthermostataboveroomtemperaturetostartthefurnace.

7.Allowthefurnacetooperatefor3minutesandthencheckthemanifoldpressure.ComparethemeasuredvaluewiththevaluelistedinTable10(Propane)orTables12or13(NaturalGas)onpage34.Ifthemanifoldpressureisnotsettotheappropriatepressure,thenitmustbeadjusted.

AdjustingtheManifoldPressure1.Singlestagegasvalve:Removetheregulatorcapfrom

thetopofthegasvalve.SeeFigure18(page19).2.Usingascrewdriver,slowlyturntheadjustmentscrew

till theappropriatemanifoldpressureisdisplayedonthepressureguage.

NOTE: Turning the screw clockwise increases thepressure, turning the screw counter-clockwisedecreases the pressure.To prevent the screw frombackingallthewayoutfromthevalve,turnthescrewslowly.

3.Replace and tighten the regulator cap over theadjustmentscrew.

RemovingtheManometer/PressureGaugeAfter the manifold pressure is properly adjusted, theManometerorpressuregaugemustbe removed fromthegasvalve.

1.Turnthethermostattoitslowestsetting.2.TurnOFFthemaingassupplytotheunitatthemanual

shut-offvalve,whichislocatedoutsideoftheunit.3.TurnOFFalloftheelectricalpowersuppliestotheunit.4.Removethepressuregaugeadapterfromthegasvalve

andreplaceitwiththe1/8”NPTmanifoldpressureplugthathadbeenremovedearlier.NOTE:Makesuretheplugistightandnotcross-threaded.

5.TurnONtheelectricalpowertotheunit.6.TurnONthemaingassupplytotheunitatthemanual

shut-offvalve.

Completing the Conversion

WARNING:Do not alter or remove the original rating plate from the furnace.

1.AffixtheLPlabelfromtheorificepackagetotheratingplate.

2.Reinstalltheappliancedoor.3.Runtheappliancethrough3completecyclestoassure

properoperation.

22

ELECTRICAL SHOCK, FIRE OR EXPLOSION HAZARD

Failuretofollowsafetywarningsexactlycouldresult in serious injury or property damage.

Improper servicing could result in dangerous operation, serious injury, death or property damage.

• Before servicing, disconnect all electricalpower to furnace.

• Whenservicingcontrols,labelallwirespriorto disconnecting. Reconnect wires correctly.

• Verifyproperoperationafterservicing.”

WARNING:

RISQUEDECHOCÉLECTRIQUE,D’INCENDIEOU D’EXPLOSION

Le non-respect des avertissements de sécuritépourrait entraîner unfonctionnementdangereuxde l’appareil, des blessures graves, la mort ou des dommages matériels.

Un entretein incorrect pourrait entraîner un fonctionnementdangereuxdel’appareil,desblessures graves, la mort ou des dommages matériels

• Couper toute alimentation électrique augénérateur d’air chaud avant de prodéder auxtravauxd’entretein.

• Aumomentdel’entretiendescommandes,étiquetez tous les fils avant de les débrancher. S’assurer de les raccorder correctement.

• S’assurer que l’appareil fonctionneadéquatement aprés l’entretien.

AVERTISSEMENT:

ELECTRICAL WIRING Line Voltage Wiring• Electricalconnectionsmustbeincompliancewithall

applicablelocalcodeswiththecurrentrevisionoftheNationalElectricCode(ANSI/NFPA70).

• ForCanadianinstallationstheelectricalconnectionsandgroundingshallcomplywiththecurrentCanadianElectricalCode(CSAC22.1and/orlocalcodes).

• Itisrecommendedthatthelinevoltage(115VAC)tothefurnacebesuppliedfromadedicatedbranchcircuitcontaining thecorrect fuseorcircuitbreaker for thefurnaceaslistedinTable5(page23).

IMPORTANT NOTES:If replacing any of the original wires supplied with the furnace, the replacement wire must be copper wiring and have a temperature rating of at least 105°F (40°C). For electrical specifications, refer to the furnace nameplate or Table 5.

An electrical disconnect must be installed readily accessible from and located within sight of the furnace. See Figure 20 (page 23) or the wiring diagram label inside of the control door. Any other wiring methods must be acceptable to authority having jurisdiction.

Proper line voltage polarity must be maintained in order for the control system to operate correctly. Verify the incoming neutral line is connected to the white wire and the incoming HOT line is connected to the black wire. The furnace will not operate unless the polarity and ground are properly connected as shown in Figure 20.

Thermostat / Low Voltage Connections• Thefurnaceisdesignedtobecontrolledbya24VAC

thermostat.Thethermostat’swiringmustcomplywiththecurrentprovisionsoftheNEC(ANSI/NFPA70)andwithapplicablelocalcodeshavingjurisdiction.

• The thermostat must be installed according to theinstructionssuppliedbythethermostatmanufacturer.Lowvoltageconnections(24VAC)fromthethermostatarewiredtotheterminalstripontheintegratedcontrolinthefurnace.Figure21(page23)containstheproperconnectionsforheatingonly(two-wire)andheating/cooling (four-wire) applications. Recommendedminimumwiregaugefor thermostatwiring isshowninTable5(page23).

• The thermostat should be mounted about 5 feetabovetheflooronaninsidewall.DONOTinstallthethermostat onanoutsidewall or anyother locationwhereitsoperationmaybeadverselyaffectedbyradiantheatfromfireplaces,sunlight,orlightingfixtures,andconvectiveheatfromwarmairregistersorelectricalappliances. Refer to the thermostat manufacturer’sinstructionsheetfordetailedmountinginformation.

23

Figure21.LowVoltageField,Four-wireHeating/Cooling Applications

RC

YG

W

STATUS

FLAMEGREENRED

180

CO

OL

HE

AT

1209060

YELLOW

BLOWEROFF

DELAY

LO

WML

MH

HIG

HE

ACL1

XF

MR

HU

M

CO

M SPEEDSELECT

3 AMPFUSE

24V

5

NE

UT

RA

LS

ROOMTHERMOSTAT

A/C CONDENSING UNIT

CONDENSING UNITCONTROL BOX

EXPANSION PORT(MOTOR CONNECTION)

FIELD WIRINGLOW VOLTAGECONNECTION

RCYGW

NOTE: The “Y” terminal on the control board must be connected to the thermostat for proper cooling mode operation.

ConnectR & W

For Heating Only

2

ELECTRONIC AIR CLEANER

MOTOR SPEED TAPS (NOT USED)

HUMIDIFIER TAP

NEUTRAL LEADS

6 3

4 1

789

5 26 3

4 1

FAN

Figure 20. Line Voltage Field Wiring

Field Supplied Disconnect w/in Sight of Furnace

Field SuppliedPanel Connector

Field SuppliedFused Service

Panel

Black (Hot)

White (Neutral)

Green or Bare(Ground)

Black

White

Black

White

Black

White

Field Line Voltage Wiring

Factory Line Voltage Wiring

Ground Ground

Junction Box (may be int. or ext.to the furnace). These connectionscan be made in the field supplieddisconnect at the furnace.

Ground

FurnaceModel Number

M7RL-

FurnaceInput(Btuh)

CabinetWidth(in.)

NominalElectrical

Supply

MaximumOperating

Voltage

MinimumOperating

Voltage

MaximumFurnaceAmperes

MinimumWire

Gauge

MaximumFuse or Circuit

Breaker Amps*

045A 45,000 197/8 115-60-1 127 103 10.0 14 20

060A 60,000 197/8 115-60-1 127 103 10.0 14 20

072A 72,000 197/8 115-60-1 127 103 9.3 14 15

Thermostat Wire GaugeRecommended Thermostat Wire Length

2-wire-Heating 4or5wire-Cooling

24 55ft. 25ft.

22 90ft. 45ft.

20 140ft. 70ft.

18 225ft. 110ft.

* Time-delayfusesorcircuitbreakersarerequired.

Table 5. Wire Length & Voltage Specifications

HeatAnticipatorSet the heat anticipator according to the instructionssuppliedbythethermostatmanufacturer.Todeterminetheheatanticipatorsetting:1.Addthecurrentdrawofthesystemcomponents;or2.MeasurethecurrentflowonthethermostatR-Wcircuit

afterthecirculatingblowermotorhasstarted.

Grounding

WARNING:To minimize personal injury, the furnace cabinet must have an uninterrupted or unbroken electrical ground. The controls used in this furnace require an earth ground to operate properly. Acceptable methods include electrical wire or conduit approved for ground service. Do not use gas piping as an electrical ground!

24

START-UP&ADJUSTMENTSPre-StartCheckList√ Verifythepolarityoftheconnectionsarecorrect,the

linevoltagepowerleadsaresecurelyconnectedandthefurnaceisproperlygrounded.

√ Verifythethermostatwires(R,W,Y,&G)aresecurelyconnectedtothecorrectleadsontheterminalstripofthecircuitboard.

√ Verifythegaslineservicepressuredoesnotexceed10.0inchesofW.C.,andisnotlessthan4.5inchesW.C.fornaturalgas.ForLPgasthelineservicepressuremustnotexceed14in.W.C.,andmustnotbelessthan11.0in.W.C.

√ Verify the roll-out and vent switches are closed. Ifnecessary,presstheredbuttontoresetaswitch.DO NOT install a jumper wire across a switch to defeat its function.Ifaswitchreopensonstartup,DONOTresettheswitchwithoutidentifyingandcorrectingthefaultcondition.

√ Verify the blower door is in place, closing the doorswitchinthelinevoltagecircuit.

√ Verifythegaslinehasbeenpurgedandallconnectionsareleakfree.

Start-upProceduresDonotperformthesestepsuntilallofthechecksinthepreviousstepshavebeencompleted:1.Setthethermostattothelowestsetting.2.Turnoffallelectricalpowertothefurnace.3.FollowtheOperatingInstructionsonthelabelattached

tothefurnace.4.Setthethermostataboveroomtemperatureandverify

theOperatingSequence(page26).5.After5minutesofoperation,setthethermostatbelow

roomtemperatureandverifysteps9-10oftheOperatingSequence.

Verifying & Adjusting Input RateThe input ratemustbeverified foreach installation topreventover-firingofthefurnace.NOTE:Theinputratemustnotexceedtherateshownonthefurnaceratingplate.Ataltitudesabove2,000feet,itmustnotexceedthatontheratingplateless4%foreach1,000feet.Todeterminetheexactinputrate,performthefollowingprocedures:

1.Shutoffallothergasfiredappliances.2.Startthefurnaceandrunitforatleast3minutes.3.Measure the time (in seconds) required for the gas

metertocompleteonerevolution.4.Convertthetimeperrevolutiontocubicfeetofgasper

hourusingTable8(page33).5.Multiplythegasflowrateincubicftperhrbytheheating

valueofthegasinBtupercubicfttoobtaintheinputrateinBtuh.Seeexample.

6.Themanifoldpressuremustbesettotheappropriatevalueforeachinstallationbyaqualifiedinstaller,serviceagencyorthegassupplier.

WARNING:Do not attempt to drill the gas orifices. Use only factory supplied orifices. Improperly drilled orifices may cause fire, explosion, carbonmonoxidepoisoning,personalinjuryordeath.

a.)Obtain themanifoldpressuresettingrequired forthisinstallationbyreferringtoTable10forPropaneorTables12or13(page34)forNaturalGas.

b.)Remove the regulator capscrew from the INLETsideoftheregulator.SeeFigure18,page19.

c.)Slowlyturntheadjustmentscrewinsidetheregulatorto obtain the appropriate manifold pressure.NOTE:Turningthescrewclockwiseincreasesthepressureandturningthescrewcounter-clockwisedecreases the pressure. To prevent backing thescrewallthewayoutfromthevalve,turnthescrewslowly.

d.)Replaceandtightentheregulatorcapscrewovertheadjustmentscrew.

Verifying & Adjusting Temperature RiseAfterinstallationofthefurnace,confirmthetemperatureriseofthefurnaceiswithinthelimitsspecifiedontheratingplate.Any temperatureriseoutside thespecified limitscouldresultinprematurefailureoftheheatexchanger.

For typical duct systems, the temperature rise will fallwithin the limits specified on the rating plate with theblowerspeedatthefactoryrecommendedsetting.Ifthemeasuredtemperatureriseisoutsidethespecifiedlimits,itmaybenecessarytochangethespeedoftheblower.NOTE: Lowering the blower speed will increase thetemperatureriseandahigherblowerspeedwilldecreasethetemperaturerise.

Thefurnaceisequippedwithamulti-speedmotor.Heatingandcoolingspeedselectionismadebymovingtheswitchontheintegratedcontrollocatedinthefurnace.

1.Placethermometersinthereturnandsupplyairstreamasclosetothefurnaceaspossible.IMPORTANT: The thermometer on the supply air side must be shielded fromdirect radiation fromtheheatexchanger toavoid false readings.

2.ConsultTable6(page25)andtheratingplateforthepropercirculatingairflowandtemperaturerise.

Example:• Timefor1revolutionofagasmeterwitha1cubic

ftdial=40seconds.• FromTable8read90cubicftgasperhr.• Localheatingvalueofthegas(obtainedfromgas

supplier)=1,040Btupercubicft.• Inputrate=1,040x90=93,600Btuh.

25

NOTE: This furnace is designed to operate with amaximumexternalpressureriseof0.3inchesofwatercolumn.Itisimportantthattheductsystembedesignedtoprovidethecorrectflowratesandexternalpressurerise.Animproperlydesignedductsystemcanresultinnuisanceshutdowns,andcomfortornoiseissues.

3.Adjustall registersandductdampers to thedesiredpositionandrunthefurnacefor10to15minutesbeforetakinganytemperaturereadings.Thetemperatureriseis the difference between the supply and return airtemperatures.

Verifying Burner Operation

CAUTION:The door over the burners may only be open for inspection purposes only. The door must be installed during unattended operation.

1.Setthethermostataboveroomtemperatureandobservetheignitionsequence.NOTE: Theburnerflameshouldcarry over immediately between all burners withoutliftingoff,curling,orfloating.Theflamesshouldbeblue,withoutyellowtips.

2.Aftervalidatingtheflame,changethermostatsettingtobelowroomtemperature.

3.Verifytheburnerflameiscompletelyextinguished.4.Replacetheburnercompartmentdoor.

Verifying Operation of the Supply Air Limit Switch

Note: Aproperlyfunctioninglimitswitchshouldturnoffthegasvalvewhenthereturnisblocked(timedependsonhowwellthereturnairisblocked).Thecirculatingairandcombustionblowersshouldcontinuetorunwhenthelimitswitchopens.

1.Verifytheblowerdoorissecurelymountedinplaceandthatthereispowertothefurnace.

2.Blockthereturnairflowtothefurnacebyinstallingaclose-offplateinplaceoforupstreamofthefilter(s).

3.SetthethermostataboveroomtemperatureandobservetheOperatingSequence.

4.Removetheclose-offimmediatelyafterthelimitswitchopens.Ifthefurnacecontinuestooperatewithnoreturnair,setthethermostatbelowroomtemperature,shutoffpowertothefurnace,andreplacethelimitswitch.

Table6.MaximumAirflow&TemperatureRises(°F)

Model Number &Heating Input (BTUH)

Motor Speed

ExternalStaticPressure(InchesWaterColumn)Recommended

A/C Ton0.1 0.2 0.3 0.4 0.5

CFM Rise CFM Rise CFM Rise CFM Rise CFM Rise

M7RL04545,000

HIGH* 1580 25 1530 26 1485 27 1435 28 1380 29 4

MEDHIGH 1355 29 1330 30 1300 30 1265 31 1220 32 3

MEDLOW 1185 33 1165 34 1140 35 1100 36 1065 37 21/2

LOW** 910 44 890 45 865 46 835 47 810 49 2

M7RL06060,000

HIGH* 1580 33 1530 35 1485 36 1435 37 1380 38 4

MEDHIGH** 1355 39 1330 40 1300 41 1265 42 1220 43 3

MEDLOW 1185 45 1165 45 1140 46 1100 48 1065 50 21/2

LOW 910 58 890 59 865 61 835 63 810 65 2

M7RL07272,000

HIGH* 1555 41 1505 42 1460 43 1405 45 1350 47 4

MEDHIGH** 1490 43 1450 44 1405 45 1355 47 1310 48 3

MEDLOW 1005 63 975 65 950 67 925 69 875 72 21/2

LOW 900 70 875 72 845 75 810 78 775 82 2

NOTES:*FactorySetCoolingSpeed

**FactorySetHeatingSpeed

1.Temperaturerises(°F)inthetableareapproximate.Actualtemperaturerisesmayvary.

2.Temperaturerisesshadedingrayareforreferenceonly.Theseconditionsarenotrecommended.

3.Airflowperformanceiswithafilter.

26

ELECTRICAL SHOCK, FIRE OR EXPLOSION HAZARD

Failuretofollowsafetywarningsexactlycouldresult in serious injury or property damage.

Improper servicing could result in dangerous operation, serious injury, death or property damage.

• Before servicing, disconnect all electricalpower to furnace.

• Whenservicingcontrols,labelallwirespriorto disconnecting. Reconnect wires correctly.

• Verifyproperoperationafterservicing.”

WARNING:

RISQUEDECHOCÉLECTRIQUE,D’INCENDIEOU D’EXPLOSION

Le non-respect des avertissements de sécuritépourrait entraîner unfonctionnementdangereuxde l’appareil, des blessures graves, la mort ou des dommages matériels.

Un entretein incorrect pourrait entraîner un fonctionnementdangereuxdel’appareil,desblessures graves, la mort ou des dommages matériels

• Couper toute alimentation électrique augénérateur d’air chaud avant de prodéder auxtravauxd’entretein.

• Aumomentdel’entretiendescommandes,étiquetez tous les fils avant de les débrancher. S’assurer de les raccorder correctement.

• S’assurer que l’appareil fonctionneadéquatement aprés l’entretien.

AVERTISSEMENT:

OPERATING SEQUENCETheoperatingsequences for theheating,cooling,andfanmodesaredescribedbelow.Refer to thefieldandfurnacewiringdiagrams:(Figure21,page23)and(Figure26page32).

Heating Cycle1.The thermostat calls for heat by energizing the W

terminalwith24VAC.2.Thecontrolverifiesthepressureswitchisopen.3.Ifthepressureswitchisopen,thecontrolenergizesthe

inducerandwaitsforthepressureswitchtoclose.Thepressureswitchmustclosewithin10seconds.

4.Thecontrolrunstheinducerfora30secondpre-purge.5.The control energizes the Hot Surface Igniter (HSI)

outputfortheappropriatewarm-uptimelimit.6.Thecontrolenergizesthemaingasvalvefor3seconds.7.Iftheflameprovedandignitesthegas,thecontrolde-

energizestheHSI.Thegasvalveandinducerremainsenergized.Thecontrolgoestoblowerondelay.

8.Ifflameispresent,thecontrolenergizestheblowerontheselectedHEATspeed30secondsafterthegasvalveopened.Thegasvalveandinducerremainenergized.

9.Whenthethermostatdemandforheatissatisfied,thecontrolde-energizesthegasvalve.TheInduceroutputremainsonfora30secondpost-purgeperiod.

10.Blower off timing begins when the thermostat issatisfied.ThecontrolwilloperateattheselectedHEATspeedof60,90,120,or180seconds.Ifthebloweroffdelay jumper isnotpresent, the fanshouldstilloperatefor120secondsattheselectedHEATspeed.TheIndoorblowermotorisde-energizedafterabloweroffdelayasselectedbythemovablejumper.

Cooling Cycle1.The thermostatcalls forcoolingbyenergizing theY

terminalwith24VAC.2.Thecontrolenergizestheblowerincoolingspeedand

sends24VACtothecontactorinthecondensingunit3.Whenthethermostatremovesthecallforcooling,the

contactorintheoutdoorcondensingunitisde-energizedandthecontrolcontinuestorunthefanforaperiodof60seconds.

Fan Mode• When the thermostat energizes the G terminal for

continuousfan(withoutcallingforheatorcooling),theindoorfanisenergizedontheselectedFANspeed.

• Ifacallforcoolingoccursduringcontinuousfan,theblowerwillswitchovertotheselectedCOOLspeed.

• If the W terminal receives a call for heat duringcontinuousfan,theblowerwilldeenergize.

• Acallforfanisignoredwhileinlockout.

MAINTENANCEPropermaintenanceismostimportanttoachievethebestperformancefromafurnace.Followtheseinstructionsforyearsofsafe,troublefreeoperation.

• Thesemaintenanceinstructionsareprimarilyintendedtoassistqualifiedtechniciansexperiencedinthepropermaintenanceandoperationofthisappliance.

• Alwaysclosethedooronthefurnaceafterservicingorcleaning/changingthefilters.Do not operate the furnace without the door closed.

• Verify the thermostat is properly installed and willnotbeaffectedbydraftsorheatfromlampsorotherappliances.

27

• To achieve the best performance and minimizeequipment failure it is recommended that a yearlymaintenancecheckupbeperformed.Ataminimum,thischeckshouldincludethefollowingitems:

Air Filter(s)

WARNING:Never operate the furnace without a filter in place. Dust and lint can build up on internal components, resulting in loss of efficiency, equipment damage, and possible fire.

Anairfilterissuppliedwiththefurnaceasshippedfromthefactory.Filtersshouldbechangedorcleanedmonthlyduringtheheatingseason.Newlybuiltorrenovatedhomesmayrequiremorefrequentchanginguntiltheconstructiondusthasminimized.

Filters designed to remove smaller particles such aspollen,mayrequireadditionalmaintenance.

Blower CompartmentDirt and lint can create excessive loads on the motorresultinginhigherthannormaloperatingtemperaturesandshortenedservice life. It is recommended that theblowercompartmentbecleanedofdirtor lintthatmayhaveaccumulatedinthecompartmentorontheblowerandmotoraspartoftheannualinspection.

Cleaning of BurnersIf theburnersmustbecleaned,followsteps1-12.SeeFigure22(page28)forcomponentlocation.1.Shutoffgassupplytothefurnaceatthemeterorata

manualvalveinthesupplypiping.2.Turnoffallpowertothefurnaceandsetthethermostat

toit’slowestsetting.3.Turn the gas control knob to the OFF position. See

Figure18(page19).4.Disconnectthewiresfromthegasvalve,igniter,flame

sensor,andflamerolloutswitch.

CAUTION:To prevent damage to the unit or internal components, it is recommended that two wrenches be used when loosening or tightening nuts. Do not over tighten!

5.Usingtwowrenches,separatetheground-jointunioninthegassupplypipingatthefurnace.

6.Remove the piping between the gas valve and theground-jointunion.(Ifapplicable).

7.Remove6screwssecuringtheburnerboxdoor.SeeFigure19(page20).

8.Remove4screwssecuringthemanifoldassemblytotheburnerbox.

9.Remove 4 screws from the corners of the box andcarefullyremovetheburnerassemblyfromthefurnace. IMPORTANT: DO NOT damage the igniter while removing the burner assembly.

10.Inspecttheburnersforaccumulateddustordebris.If necessary carefully clean them with a soft wirebrushandavacuumcleaner.IMPORTANT:DO NOT damage the igniter while cleaning the burner assembly.

11.Replaceallthepartsinreverseorderthattheywereremoved.

12.Followthelightinginstructionsfoundonthefurnacedoortoreturnthefurnacetooperation.Verifyproperoperationafterservicing.

Vent System

WARNING:Holesintheventpipeorheatexchangercancause combustion products to enter the home. Replacetheventpipeorheatexchangerifleaksare found. Failure to prevent the circulation of combustion products into the living space can create potentially hazardous conditions including carbon monoxide poisoning thatcould result in personal injury or death.

Checktheinletpipe(ifapplicable)andoutletpipetoensurethey are not blocked by debris. Any damaged sectionofventpipemustbe replaced,andanyobstructionorblockagemustberemovedpriortooperatingthefurnace.

HeatExchanger&BurnerMaintenanceThefurnaceshouldoperateformanyyearswithoutsootbuildupinthefluepassageways,however,theflue,ventsystem,andburnersshouldbeinspectedandcleaned(ifrequired)byaqualifiedservicetechnicianannuallytoensure continued safe operation. Pay attention to anydeteriorationfromcorrosionorothersources.

LubricationThebearingsintheblowermotorandinducerblowerusedinthesefurnacesarepre-lubricatedandsealedbythemanufacturer.Nofurtheroilingofthebearingsisrequiredforthelifeofthemotor.

28

If the furnace fails to operate check the following:• Isthethermostatoperatingproperly?• Aretheblowercompartmentdoor(s)inplace?• Isthefurnacedisconnectclosed?• Hasthecircuitbreakertrippedorthecontrolboardfuse

burnedopen?• Isthegasturnedon?• Areanymanualresetswitchesopen?• Isthefilterdirtyorplugged?• Istheflamesensorcoated?(Removeandcleanwith

steelwool.(Do not use emery cloth or sandpaper!)• Isthereblockageinthecondensatedrainswitch?Also

verifythatthereisnodoubletrappingofcondensate.• Is thesecondaryheatexchanger freeofdebrisand

clogs?• Isevaporatorcoilcleanandfreeofdebris(Ifapplicable).• ArealltheLED’sonthefurnacecontrolboardconstantly

ON?Ifnot,refertoTable7orthewiringdiagram(Figure26,page32)todeterminefaultcondition.

IMPORTANT NOTE: The furnace will lock out after 5 failed attempts for ignition and will try again every hour if the call for heat remains.

• Iftheinducerblowerisoperating,anditemsabovehavebeenverified,checktheblowerlimitswitchandresetifnecessary.SeeFigure22forcomponentlocation.

• IfthefurnaceoperateswhentheBlowerLimitSwitchisreset,contactaqualifiedservicetechniciantoidentifyandrepairtheproblem.

• If the furnace still doesn’t operate, check the flameroll-outswitchandresetifnecessary.

• Ifthefurnaceoperateswhentheflamerolloutswitchisreset,contactaqualifiedservicetechniciantoidentifyandrepairtheproblem.

Diagnostic Description Green LED Red LED

ControlFault(NoPower) Off Off

L1/NeutralPolarityFault Flash Flash

1HourLockout AlternatingFlash

NormalOperation On On

PressureSwitchClosedFault On Flash

PressureSwitchOpenFault Flash On

OpenLimitSwitchFault Flash Off

Diagnostic Description Yellow LED

LowFlameSensorSignal ContinuousFlash

FlamePresent On

Table 7. Control Board Fault Conditions

TROUBLESHOOTING DESCRIPTION OF COMPONENTSThedescriptionsbelowarevariousfunctionalcomponentsthataffecttheoperationandshuttingdownofthisfurnace.SomeofthesecomponentsandtheirlocationsareshowninFigure22.Ifanycomponentofthefurnacemustbereplaced,useonlyfactoryauthorizedreplacementpartsspecifiedintheReplacementPartsListprovidedonline.

Blower Limit Switch:Preventsoperationwhenblowerisnotoperational.

Flame Sensor: Verifieswhenaflamehascarriedoverfromtheignitertotheoppositeendburner.Ifnoflameisdetected,thefurnacewillshutdownwithin4seconds.

FlameRoll-OutSwitch:Verifiesthattheburnerflamesaredrawnintotheheatexchangertubes.Iftheburnerflamesarenotproperlydrawnintotheheatexchanger,theflameroll-outswitchwillclosethegasvalveandinitiatetheshutdowncycle.

Gas Valve: Controlstheflowofgastotheburners.Whenthe gas valve is energized it automatically opens andregulatesthegaspressureinthemanifold.

Inducer Assembly: Vents products of combustion totheoutside.

Pressure Switch: Verifies that the inducer is drawingthecombustiongasesthroughtheheatexchanger.Thepressureswitchpreventsfurnaceoperationwithexcessiveflue/condensateblockageorimproperinduceroperation.

Main Air Limit Switch: Prevents the air temperatureleavingthefurnacefromexceedingthemaximumallowableoutletairtemperature.

Figure 22. Furnace Components

Blower Assembly

Inducer Assembly

Gas Valve

Gas Manifold &Burner Assembly

Blower Switch

Control Board

Limit Switch

Inline DrainAssembly

IgniterFlame Sensor

Roll-Out Switch

Combustion Air Pipe

Exhaust Vent Pipe

Main Air Limit Switch24V Transformer

M7RL B Cabinet Shown

29

FIGURES & TABLES

Figure 23. A Cabinet Models (Short)

17 1/8

56

18 1/2

18 1/2

1 1/2

7/8(Electric)

1 3/16

2

23 1/2

2 3/4

3 1/2

15

2 3/8

21 5/8TYP.

1/2

15

1/2 TYP.

15 1/2

17 3/41

3 1/2(X2)

2

2 1/2 x 5(Ventilaire)

2 3/4

3

2 5/8

5

18 1/2

18 1/2

1 1/2

1 7/8

2

1 3/16

20 1/4

Knockouts (x4)

1 1/2 X 3 1/2(Gas or Condensate)1 1/2 X 3 1/2

(Gas or Condensate)

20

24 5/8

Knockouts (x4) Knockouts (x4)

1 1/2 X 3 1/2(Gas or Condensate - Typical)

1 1/8

Furnace Dimensions

30

Figure 24. B Cabinet (Tall) Models

2 1/2 x 5(Ventilaire)

Knockouts (x4)

17 1/8

76

20 1/4

19 3/4

55

20

18 1/2

18 1/2

1 1/22

1 7/8

21.250

1 1/2 X 3 1/2(Gas or Condensate)

17 3/4

15 1/2

1

3 1/2(X2)

2 3/4

32

2 5/8

5

24 5/8

1 1/2 X 3 1/2(Gas or Condensate)

43 1/2

21 1/4

3 1/2

2 3/47/8

(Electric)

18 1/2

18 1/2

1 1/2

2 1/2

Knockouts (x4) Knockouts (x4)

15

15

2 3/8

21 5/8TYP.

1 1/2 X 3 1/2(Gas, Condensate, or Linesets - Typical)

1 1/8

31

Figure 25. B Cabinet (w/ Top Return Air) Models

55

19 7/8

76

18 1/2

18 1/2

1 1/2

43 1/2

24 5/8

21 1/4

1 7/8

21.250

3

2 3/4

2

19 3/4

15 1/2

17

19 7/8

3 1/2(X2)

1 1/2 X 3 1/2(Gas) 3 1/2

2

2 3/4

2 1/2 x 5(Ventilaire)

7/8(Electric)

1 1/2 X 3 1/2(Gas)

2 5/8

5

15

15

1/2 TYP.

21 5/8TYP.

1 1/82 3/8

Knockouts (x4) Knockouts (x4)

18 1/2

18 1/2

1 1/22

1 1/2 X 3 1/2(Gas or Condensate - Typical)

32

WIRING DIAGRAM

Figure 26. M7RL Wiring Diagram

IGN

ITO

R

IND

UC

ER

FLA

ME

SE

NS

OR

C

VE

NT

LIM

IT

DO

OR

SW

ITC

H

R

4 S

PE

ED

MO

TO

R

FLA

ME

RO

LLO

UT

GA

SV

ALV

E

H

MH

ML

L

C

BLO

WE

RD

EC

KLI

MIT

SU

PP

LYA

IR L

IMIT

PR

ES

SU

RE

SW

ITC

H

R C Y G W

LOW

ML

MH

HIGH

EAC

L1

XFMR

HUM

123

456

789

123

456

CO

M3

AM

P F

US

E24

V

24 V

120

V

WH

ITE

W/ B

LK S

TR

IPE

S

BLK

W/ W

HIT

E S

TR

IPE

S

12

34

12

34

11

22

33

44

55

66

77

88

99

L1ANEUTRALS

GR

EE

N YE

LLO

W

RE

D

RC

TXRXW

COM

1 21 2

1 21 2

12

34

WH

ITE

RE

D

BLU

EO

RA

NG

E

BLA

CK

WH

ITE

BLA

CK

BLU

E

BLU

E

BLUE

BLU

E/W

HIT

E

BLUE

OR

AN

GE

OR

AN

GE

GR

EE

N

WHITE

BLUE

YE

LLO

W

RE

DO

RA

NG

E

BLA

CK

WH

ITE

BLU

E

BLA

CK

RE

D

BLA

CK

BLA

CK

BLACK

BLU

E

GR

EE

N

BLUE

BLACK

BLACK

WH

ITE

YE

LLO

W

SIN

GLE

STA

GE

TH

ER

MO

STA

T

TO OUTDOOR UNIT

FIE

LD W

IRIN

G

LEG

EN

D:

LOW

VO

LTA

GE

HIG

H V

OLT

AG

E

WIR

ING

DIA

GR

AM

For

80+

and

90+

Sin

gle

Sta

ge

Furn

aces

Ref

er t

o t

he

Inst

alla

tio

n In

stru

ctio

ns

pro

vid

ed w

ith

th

e fu

rnac

e fo

r th

e p

rop

er h

eati

ng

an

d c

oo

ling

sp

eed

sfo

r yo

ur

app

licat

ion

.

If a

ny o

f th

e o

rig

inal

wir

e as

su

pp

lied

wit

hth

e fu

rnac

e m

ust

be

rep

lace

d, i

t m

ust

be

rep

lace

d w

ith

wir

ing

mat

eria

l hav

ing

ate

mp

erat

ure

of

at le

ast

105

C.

Use

co

pp

er c

on

du

cto

rs o

nly

.

Dia

gn

ost

ic D

escr

ipti

on

Gre

en L

ED

Red

LE

DC

ontr

ol F

ault

(No

Pow

er)

Off

Off

L1 /

Neu

tral

Pol

arity

Fau

ltF

lash

Fla

sh1

Hou

r Lo

ckou

tn

On

Onoitarep

O lamro

N Pre

ssur

e S

witc

h C

lose

d F

ault

On

Fla

shP

ress

ure

Sw

itch

Ope

n F

ault

Fla

shO

nO

pen

Lim

it S

witc

h F

ault

Fla

shO

ff

Dia

gn

ost

ic D

escr

ipti

on

Low

Fla

me

Sen

sor

Sig

nal

Fla

me

Pre

sent

FA

UL

T C

ON

DIT

ION

S

Yel

low

LE

DC

ontin

uous

Fla

shO

n

Alte

rnat

ing

Fla

sh

7111

33A

(Rep

lace

s 71

1133

0)03

/11

33

GAS INFORMATION

GAS PIPE CAPACITIES

Nominal PipeDiameter (IN.)

Length of Pipe Run (Feet)

10 20 30 40 50 60 70 80

1/2 130 90 75 65 55 50 45 40

3/4 280 190 150 130 115 105 95 90

1 520 350 285 245 215 195 180 170

11/4 1,050 730 590 500 440 400 370 350

11/2 1,600 1,100 890 760 670 610

NOTE: Thecubicfeetperhourlistedinthetableabovemustbegreaterthanthecubicfeetperhourofgasflowrequiredbythefurnace.Todeterminethecubicfeetperhourofgasflowrequiredbythefurnace,dividetheinputrateofthefurnacebytheheatingvalue(fromgassupplier)ofthegas.

Cubic Feet Per Hour Required =Input To Furnace (Btu/hr)

Heating Value of Gas (Btu/Cu. Ft.)

Table 9. Capacity of Black Iron Gas Pipe (cu. ft. per hour)for Natural Gas w/ Specific Gravity = 0.60

GAS FLOW RATES

TIME FORONE REVOLUTION

(SECONDS)

CUBIC FEET PERREVOLUTION OF GAS METER

1 5 10

10 360 1,800 3,600

12 300 1,500 3,000

14 257 1,286 2,571

16 225 1,125 2,250

18 200 1,000 2,000

20 180 900 1,800

22 164 818 1,636

24 150 750 1,500

26 138 692 1,385

28 129 643 1,286

30 120 600 1,200

32 113 563 1,125

34 106 529 1,059

36 100 500 1,000

38 95 474 947

40 90 450 900

42 86 429 857

44 82 409 818

46 78 391 783

48 75 375 750

50 72 360 720

52 69 346 692

54 67 333 667

56 64 321 643

58 62 310 621

60 60 300 600

62 58 290 581

64 56 281 563

Table 8. Gas Flow Rates (Cubic Feet per Hour)

GAS FLOW RATES

TIME FORONE REVOLUTION

(SECONDS)

CUBIC FEET PERREVOLUTION OF GAS METER

1 5 10

66 55 273 545

68 53 265 529

70 51 257 514

72 50 250 500

74 49 243 486

76 47 237 474

78 46 231 462

80 45 225 450

82 44 220 439

84 43 214 429

86 42 209 419

88 41 205 409

90 40 200 400

92 39 196 391

94 38 191 383

96 38 188 375

98 37 184 367

100 36 180 360

102 35 176 353

104 35 173 346

106 34 170 340

108 33 167 333

110 33 164 327

112 32 161 321

114 32 158 316

116 31 155 310

118 31 153 305

120 30 150 300

34

LOCAL HEATING VALUES FOR NATURAL GAS

ALTITUDE ABOVE SEA LEVEL

BTU PER CUBIC FOOT

650 700 750 800 850 900 950 1,000 1,050

2,000FT LOW LOW LOW LOW LOW LOW HIGH HIGH HIGH

3,000FT LOW LOW LOW LOW LOW LOW HIGH HIGH HIGH

4,000FT LOW LOW LOW LOW LOW HIGH HIGH HIGH HIGH

5,000FT LOW LOW LOW LOW LOW HIGH HIGH HIGH HIGH

6,000FT LOW LOW LOW LOW HIGH HIGH HIGH HIGH HIGH

7,000FT LOW LOW LOW LOW HIGH HIGH HIGH HIGH HIGH

8,000FT LOW LOW LOW HIGH HIGH HIGH HIGH HIGH HIGH

9,000FT LOW LOW LOW HIGH HIGH HIGH HIGH HIGH HIGH

10,000FT LOW LOW HIGH HIGH HIGH HIGH HIGH HIGH HIGH

Table 11. Natural Gas Heating Values

Table 10. High Altitude Deration Chart for Propane Gas

FurnaceModelM7RL

FurnaceInput(Btuh)

ALTITUDE ABOVE SEA LEVEL (FEET)

0 to 1,999 2,000 to 2,999 3,000 to 4,999 5,000 to 5,999 6,000 to 7,999 8,000 to 10,000

Orifice Size

Manifold Pressure

OrificeSize

Manifold Pressure

OrificeSize

Manifold Pressure

OrificeSize

Manifold Pressure

OrificeSize

Manifold Pressure

OrificeSize

Manifold Pressure

045A 45,000 57 10.0 57 9.0 57 8.5 59 10.0 59 9.0 59 8.5

060A 60,000 55 10.0 55 9.0 55 8.5 56 10.0 56 9.0 56 8.5

072A 72,000 56 10.0 56 9.0 56 8.5 57 10.0 57 9.0 57 8.5

Table 12. High Altitude Deration Chart for Natural Gas-HighHeatingValue

NATURAL GAS withHIGH HEATING VALUE

ALTITUDE ABOVESEA LEVEL

INPUT (BTU)

45,000 60,000 72,000

0 to 1,999 FT49 45 47 ORIFICESIZE

3.5 3.5 3.5 MANIFOLDPRESSURE

2,000 to 2,999 FT49 45 47 ORIFICESIZE

2.9 3.3 3.2 MANIFOLDPRESSURE

3,000 to 3,999 FT49 45 47 ORIFICESIZE

2.8 3.1 3.0 MANIFOLDPRESSURE

4,000 to 4,999 FT49 45 47 ORIFICESIZE

2.6 2.9 2.8 MANIFOLDPRESSURE

5,000 to 5,999 FT49 45 47 ORIFICESIZE

2.5 2.8 2.7 MANIFOLDPRESSURE

6,000 to 6,999 FT51 48 49 ORIFICESIZE

3.3 3.5 3.5 MANIFOLDPRESSURE

7,000 to 7,999 FT51 48 49 ORIFICESIZE

3.0 3.3 3.3 MANIFOLDPRESSURE

8,000 to 8,999 FT51 48 49 ORIFICESIZE

2.8 3.0 3.0 MANIFOLDPRESSURE

9,000 to 9,999 FT51 48 49 ORIFICESIZE

2.6 2.8 2.8 MANIFOLDPRESSURE

NATURAL GAS withLOW HEATING VALUE

ALTITUDE ABOVE SEA LEVEL

INPUT (BTU)

45,000 60,000 72,000

0 to 1,999 FT49 45 47 ORIFICESIZE

3.5 3.5 3.5 MANIFOLDPRESSURE

2,000 to 2,999 FT49 45 47 ORIFICESIZE

3.5 3.5 3.5 MANIFOLDPRESSURE

3,000 to 3,999 FT49 45 47 ORIFICESIZE

3.1 3.4 3.3 MANIFOLDPRESSURE

4,000 to 4,999 FT49 45 47 ORIFICESIZE

2.9 3.2 3.1 MANIFOLDPRESSURE

5,000 to 5,999 FT49 45 47 ORIFICESIZE

2.7 3.1 2.9 MANIFOLDPRESSURE

6,000 to 6,999 FT49 45 47 ORIFICESIZE

2.6 2.9 2.8 MANIFOLDPRESSURE

7,000 to 7,999 FT51 48 49 ORIFICESIZE

3.5 3.5 3.4 MANIFOLDPRESSURE

8,000 to 8,999 FT51 48 49 ORIFICESIZE

3.1 3.3 3.2 MANIFOLDPRESSURE

9,000 to 9,999 FT51 48 49 ORIFICESIZE

2.9 3.1 2.9 MANIFOLDPRESSURE

Table 13. High Altitude Deration Chart for Natural Gas-LowHeatingValue

35

VENTING INFORMATION

Table 14. Vent Termination Clearances

Clearance Location

CANADIAN INSTALLATIONS a US INSTALLATIONS b

DirectVent(2-pipe)&ConventionalVent(1-pipe)

Furnaces

Direct Vent(2-pipe)Furnaces

Conventional Vent(1-pipe)Furnaces

A Clearanceabovegrade,veranda,porch,deck,balcony,ormaximumexpectedsnowlevel.

12inches(30cm) 12inches(30cm) 12inches(30cm)

B Clearancetowindowordoorthatmaybeopened.

6inches(15cm)forappliances<10,000Btuh(3kW)

6inches(15cm)forappliances<10,000Btuh(3kW)

4ft.(1.2m)belowortosideofopening;1ft.(300mm)aboveopening

12inches(30cm)forappliances10,000Btuh-100,000Btuh(30kW)

9inches(23cm)forappliances10,000Btuh-50,000Btuh(30kW)

36inches(91cm)forappliances>100,000Btuh(30Kw)

12inches(30cm)forappliances>50,000Btuh(30Kw)

C Clearancetopermanentlyclosedwindow * * *

DVerticalclearancetoventilatedsoffitlocatedabovetheterminalwithinahorizontaldistanceof2feet(61cm)fromthecenterlineoftheterminal.

* * *

E Clearancetounventilatedsoffit. * * *F Clearancetooutsidecorner. * * *G Clearancetoinsidecorner. * * *H Clearancetoeachsideofcenterlineextendedabove

meter/regulatorassembly.3feet(91cm)withinaheight15feetabovethemeter/regulatorassembly * *

I Clearancetoserviceregulatorventoutlet. 3feet(1.83m) * *

JClearancetonon-mechanicalairsupplyinlettobuildingorthecombustionairinlettoanyotherappliance.

6inches(15cm)forappliances<10,000Btuh(3kW)

6inches(15cm)forappliances<10,000Btuh(3kW)

4ft.(1.2m)belowortosideofopening;1ft.(300mm)aboveopening

12inches(30cm)forappliances10,000Btuh-100,000Btuh(30kW)

9inches(23cm)forappliances10,000Btuh-50,000Btuh(30kW)

36inches(91cm)forappliances>100,000Btuh(30Kw)

12inches(30cm)forappliances>50,000Btuh(30Kw)

K Clearancetomechanicalairsupplyinlet. 6feet(1.83m)3feet(91cm)aboveifwithin10feet(3m)horizontally

3ft.(91cm)aboveifwithin10feet(3m)horizontally

L Clearanceabovepavedsidewalkordrivewaylocatedonpublicproperty. 7feet(2.13m)c * 7ft.(2.13m)

M Clearanceunderveranda,porch,deck,orbalcony. 12inches(30cm)d * *NOTES:

a InaccordancewiththecurrentCSAB149.1NaturalGasandPropaneInstallationGuideCode

b InaccordancewiththecurrentANSIZ223.1/NFPA54NaturalFuelGasCode

c Aventshallnotterminatedirectlyaboveasidewalkorpaveddrivewaythatislocatedbetweentwosinglefamilydwellingsandservesbothdwellings.

d Permittedonlyifveranda,porch,deck,orbalconyisfullyopenonaminimumoftwosidesbeneaththefloor.

*ForclearancesnotspecifiedinANSIZ223.1/NFPA54orCSAB149.1,thefollowingstatementshallbeincluded:“Clearanceinaccordancewithlocalinstallationcodes,andtherequirementsofthegassupplierandthemanufacturersinstallationinstructions.”/“Dégagementconformeauxcodesd’installationlocaux,auxexigencesdufournisseurdegazetauxinstructionsd’installationdufabricant”.

VENT TERMINAL AIR SUPPLY INLET AREA WHERE TERMINAL IS NOT PERMITTED

36

Figure 27. Horizontal & Vertical Venting

VERTICAL VENTING HORIZONTAL VENTING

FL

UE

PIP

E

Straps or Other SuitableSupports at minimum of 5 ft. Intervals

Upward Pitch - 1/4” per foot(Flue Pipe)

First support placedas close to furnace

connection as possible

WallNormal

Snow Level

CO

MB

US

TIO

N A

IR

Seal/CaulkAround Pipes

at Building

90° Elbow

7”12” Min.

90° Elbow

90° Elbow

Support System onVertical Rise

FL

UE

PIP

E

CO

MB

US

TIO

N A

IR

See Table 2 forPVC Pipe Lengths (Field Supplied)

See Table 2 forPVC Pipe Lengths (Field Supplied)

M7RL B Cabinet Shown

37

38

39

INSTALLATION / PERFORMANCE CHECK LIST

INSTALLER NAME:

CITY: STATE:

INSTALLATION ADDRESS:

CITY: STATE:

UNITMODEL#

UNITSERIAL#

MinimumclearancesperTable1(page5)?

YES NO

Hastheowner’sinformationbeenreviewedwiththehome-owner?

YES NO

Has the literaturepackagebeenleftnearthefurnace?

YES NO

ATTENTIONINSTALLERS:Itisyourresponsibilitytoknowthisproductbetterthanyourcustomer.This includesbeingable to install theproduct according to strictsafetyguidelinesand instructingthecustomeronhowtooperateandmaintaintheequipmentforthelifeoftheproduct.Safetyshouldalwaysbethedecidingfactorwheninstallingthisproductandusingcommon sense plays an important role as well. Pay attention toallsafetywarningsandanyotherspecialnoteshighlightedinthemanual.Improperinstallationofthefurnaceorfailuretofollowsafetywarningscouldresultinseriousinjury,death,orpropertydamage.

Theseinstructionsareprimarilyintendedtoassistqualifiedindividualsexperiencedintheproperinstallationofthisappliance.Somelocalcodesrequirelicensedinstallation/servicepersonnelforthistypeofequipment.Pleasereadallinstructionscarefullybeforestartingtheinstallation.Returntheseinstructionstothecustomer’spackageforfuturereference.

PROPOSITION 65 WARNING: This product contains chemicals known to the state of California to cause cancer, birth defects or other reproductive harm.

WARNING:

ELECTRICAL SYSTEM:

Electricalconnectionstight? YES NO

Linevoltagepolaritycorrect? YES NO

SupplyVoltage:________________________________ VOLTS

Hasthethermostatbeencalibrated? YES NO

Isthethermostatlevel? YES NO

Istheheatanticipatorsettingcorrect? YES NO

GAS SYSTEM:

GasType:(circleone)Natural

GasPropane

Gaspipeconnectionsleaktested? YES NO

GasLinePressure:____________________________ (in-W.C.)

InstallationAltitude: ______________________________ (FT.)

DerationPercentage:______________________________ (%)

FurnaceInput:_________________________________ (Btuh)

SupplyAirTemperature:__________________________ (°F)

ReturnAirTemperature:__________________________ (°F)

TemperatureRise:_______________________________ (°F)

COMBUSTION AIR & VENTING SYSTEM:

Isthereadequatefreshairsupplyforcombustionandventilation?

YES NO

Ventfreefromrestrictions? YES NO

Filter(s)securedinplace? YES NO

Filter(s)clean? YES NO

Flueconnectionstight? YES NO

Isthereproperdraft? YES NO

Specifications&illustrationssubjecttochangewithoutnoticeorincurringobligations.O’Fallon,MO|PrintedinU.S.A.(05/11) 7092640(NEW)