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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
3
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)