Sears 8MPN050B12B1 Addition Of Air Conditioning, Optional Filter Rack Installation Side Return

Page 24

Optional Duct Standoff

20 x 25 Optional

Filter Rack

25-23-05-4

Filter

Optional Filter Rack Installation: Side Return

Center the filter rack on the side panel, flush with the bottom edge of the furnace. Mark the fastening holes. Drill the fastening holes in the side panel and fasten the filter rack in place with sheet metal screws. See Figure 23 and Figure 24.

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Side Return Filter Rack

Filter

25-23-05-4a

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i_Filters Installed on Two Sides

Using Two

Filter Racks

25-23-05-3

Filter

Filter

Internal Filter in Bottom- Return Installation

When installing a bottom-mounted filter inside the furnace, install the filter clips on the edge of the bottom duct opening with the wider end of the clips toward the blower, as shown in Figure 25. Clips

may be obtained from your distributor or fabricated from sheet metal (Figure 26). Insert filter into side clips first and push filter back until it is fully engaged into back clip.

Bottom Mounted Filter

Center Clip

sideto

25-24-18-1

11/4"

26 Ga, Galvanized Steel

NOTE: If filters are only suitable for heating application, advise homeowner that filter size may need to be increased if air condi- tioning is added.

Addition Of Air Conditioning

When a refrigeration coil is used in conjunction with this furnace, it must be installed on the discharge side of the furnace to avoid con-

densation in the heat exchanger. The coil installation instructions must be consulted for proper coil location and installation proce-

dures. With a parallel flow arrangement, dampers must be installed to prevent chilled air from entering the furnace. Ifmanual- ly operated dampers are used, they must be equipped with a means to prevent operation of either unit unless the damper is in full heat or full cool position.

Copper or plastic tubing may be used for the condensate drain line.

441O1 261302

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Contents 80+SingleStage Address Limit OpensDrip-Leg Upstream of Gas Valve? Yesi NOI Dealer NameSafe Installation Requirements FIRE, EXPLOSION, and Asphixiation HazardInstallation Requirements Frozen Water Pipe HazardLocation and Clearances Carbon Monoxide Poisoning HazardDimensions and Clearances N8MPN/L Dimensional InformationFurnace ReturnAirInstallation Positions Furnace InstallationDimensions and Clearances *8MPN/L Models 41ITypical Horizontal Installation HorizontalDownflow Fire HazardPressure Switch Relocation Rotating the Venter AssemblySide Venting Burn HazardAir Openings and Connecting Ducts Combustion & Ventilation AirOutdoor Combustion Air Method RequirementsThisinstallationNOTapprovedin Canada SoffitVenIndoor Combustion Air FreeAreaMINIMUMSPACEVOLUMEFOR100%COMBUSTION Ventilation AirCategory I Safe Venting Requirements Andventilationair Fromindoors ftVenting and Combustion Air Check Venting to Existing Masonry ChimneyVent Check Lowing CheckCategory I Furnaces With External Power Venters Horizontal VentingVent Termination Combined Venting into a Masonry ChimneyIviventterminal Masonry Chimney Venting Chimney InspectionFailure to properly vent this furnace could result Authority having jurisdiction approvesChimney Inspection Chart SllFAN+NAT Installations with Type-B Double-Wall Vent ConnectorsExterior Masonry Chimney Nfpa & AGAGas Supply and Piping Ventdampersonanyapplianceconnectedto the common ventGas Pressures Typical Gas Piping N8MPLeft Side Gas Supply Piping N8MP Piping with Close Nipples and Standard ElbowsPiping with Street Elbows Final Check Typical Gas Piping aMPPiping with Street Elbows Fire or Explosion HazardElectrical Wiring Power Supply WiringBox Relocation ThermostatDuctwork and Filter Upflow/Horizontal Furnace ControlFurnace Control Fuse Duct DesignDuct Installation Requirements FiltersHigh-Velocity Air Filter Sizes max600FPM Risk of Reduced Furnace LifeOptional Filter Rack Installation Side Return Internal Filter in Bottom- Return InstallationAddition Of Air Conditioning 20 x 25 Optional Filter RackSub-bases For Combustible Floors Dimensions Ductwork and Filter DownflowOutlet Duct Flange Sub-Bases for Combustible Floors Furnace OnlyExploded View of Sub-Base for Furnace only Sub-base for Combustible Floors Downflow CoilAdapter Box Non-Combustible FloorChecks and Adjustments Manifold Gas Pressure AdjustmentStartup Orifice Sizing Wiseto decreasemanifoldpressureand clockwisetoNatural Gas Input Rating Check Operation Above 2000 AltitudeHigh Altitude Air Pressure Switch I! i! i I! i! i! i! iChanging Orifices Natural GAS Manifold Pressure w.cLP Conversion Main Burner Flame CheckFIRE, EXPLOSION, Unit Damage Hazard Removing NOx insertsHard Wired Continuous-Fan Operation Changing Blower SpeedIgnitor Location Reduced Furnace Life HazardOus-fanoptionThisconnectionisintendedfor.thelow speed mo Separate speed selections for Heat, Cool,FIRE, EXPLOSION, or Carbon Monoxide Poisoning Hazards Electrical SHOCK, Fire or Explosion HazardSequence of Operation & Diagnostics Continuous Circulating Fan Hard-Wired Cont RequestContinuous Circulating Fan G Request Heating W RequestControl Board Diagnostic Codes See Figure Heating Request with Gas Shut OffControl Board OFFN8MPN050B12B1 N8MPL050B12B1 N8MPN075F16B1 N8MPL075F16B1Denotes Brand This Data is Subject to Change Without Notice 44101261302General InputBtuh 441ol Limits& ControlsPSC/II2 PSC/I/2 Natto LP NAHA001LP1172958NatlLP NatlLP NatlLP NatlLP NatlLP NatlLP NatlLP NatlLP 8MPNPSC/I/2 PSCII/2 PSCI3/4 441Ol261302 N8MPN/L050B12& *8MPN/L050B121 DenotesBrand N8MPN/L075B12& *8MPN/L075B121 * Denotes BrandN8MPN/L075F16& *8MPN/L075F1613* DenotesBrand N8MPN100F14& *8MPN100F141 Denotes BrandN8MPN/L125J2226 ISMPN150J2027* DenotesBrand44101261302 Eutrali Switch II,DUER%I .ICAPACITOR aNdif Junction Relay Heatimhio16 \ \ uReplacement Parts N8MPN NaturalGas NsmpnReplacement Parts N8MPN NaturalGas IoofKey Description Part 12B1 14B1 20B120A1 22A1 Parts Not IllustratedReplacement Parts N8MPL NaturalGas N8MPLKey Description Part 050B 075F NSMPLO75B12B1 NSMPLIOOF2OB1 N8MPLIOOJ2OB1NSMPL125J22B1 NsmplParts for *8MPN/L IReplacement Parts *8MPN NaturalGas Panel Top Partnot Illustrated Parts *8MPL NaturalGas Key Description075B Replacement Parts 8MPL NaturalGas

8MPN125J20B1, N8MPL050B12B1, N8MPL100F20B1, 8MPN050B12B1, 8MPL075F16B1 specifications

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