Sears 8MPL050B12B1, 8MPL075B12B1, 8MPL075F16B1, 8MPL100F20B1, 8MPL100J20B1, 8MPL125J20B1, 8MPN050B12B1, 8MPN075B12B1, 8MPN075F16B1, 8MPN100F14B1, 8MPN100F20B1, 8MPN100J20B1, 8MPN125J20B1, 8MPN150J20B1, N8MPL050B12B1, N8MPL075B12B1, N8MPL075F16B1, N8MPL100F20B1, N8MPL100J22B1, N8MPL125J20B1, N8MPL125J22B1, N8MPN050B12B1, N8MPN075B12B1, N8MPN075F16B1, N8MPN100F14B1, N8MPN100F20B1, N8MPN100J22B1, N8MPN125J20B1, N8MPN125J22B1 x

Parts for *8MPN/L

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Contents

Main 80+SingleStage CategoryIFurnace PrintedinU.S.A. 11/10/2005 441 01 2613 (02) N8MPN&N8MPL *8MPN&*8MPL SAFETY REQUIREMENTS YES_I NO_I YES_I NO_I NO [_I YEs_I NO[31 NO[_I NOE_I 1. Safe Installation Requirements Safety Rules Frozen Water Pipe Hazard Ifyourfurnace remains off for an extended time, the pipes in your 2. Installation Location and Clearances Installation Requirements Dimensions and Clearances (N8MPN/L) DIMENSIONAL INFORMATION 11124,10 213,4 Dimensions and Clearances (*8MPN/L Models) /41I J DIMENSIONAL INFORMATION T Installation Positions Horizontal Typical Horizontal Installation Main Line Entry Pressure Switch Relocation 3. Side Venting Rotating the Venter Assembly Typical Downflow Installation Furnace with Screws Venter Gasket 4. Combustion & Ventilation Air Outdoor Combustion Air Method Air Openings and Connecting Ducts Requirements Contaminated Combustion Air I/ SoffitVen, 4. Combination of Indoor and Outdoor Air shall have: FreeArea Indoor Combustion Air Standard and Known-Air-Infiltration Rate Methods 75 I If: [ other=combined input of all other than fan-assisted appliances in Btu/hr ACH =air changes per hour (ACH shall not exceed 0.60.) Ventilation Air 5. Gas Vent Installation /2N Venting to Existing Masonry Chimney NOTE: Two (2) 45 elbows are equivalent to one (1)90 elbow. Combined Venting into a Masonry Chimney 6. Horizontal Venting Category I Furnaces With External Power Venters Vent Termination Venting Through a Non-Combustible and Combustible Wall iiiiiiiiiiiiiiiiiiiiiiiiiiiii i i! ii ii ! i ! !i ! ii i i i i i i i i i i i Other than Direct Vent Termination Clearance IVIVENTTERMINAL AIRSUPPLVINLET 3'(01cm) 7'(2.13m) 7. Masonry Chimney Venting Chimney Inspection Connector Type VentingRestrictions for Chimney Types 5. The authority having jurisdiction approves. Oondonsoto ",,<u,ob,,y sll ed,,stedfle,ib,o eta, j Tu_ I NotSuitable andlinerorventmanufacturer's \/I-,,<u,,ab,,y Exterior Masonry Chimney, FAN+NAT Installations with Type-B Double-Wall Vent Connectors APPLIANCE APPLICATION REQUIREMENTS Vent dampers onany appliance connected 8. Gas Supply and Piping GasPiping Requirements GasSupply Requirements IGasPressures RightSide Gas SupplyPiping (N8MP) Left Side Gas Supply Piping (N8MP) Piping with Street Elbows Gas Valve with Elbows (N8MP) Piping with Close Nipples and Standard Elbows Final Check 9. Electrical Wiring Power Supply Wiring J- Box Relocation N8MPN/LModels *8MPN/L Models .0M 10. Ductwork and Filter (Upflow/Horizontal) Duct Connections Cutting Side Return Air Opening Duct Design Duct Installation Requirements InspectionPanel on some models Filters A filter MUST be used. High-Velocity Air Filter Sizes (max.600FPM) Addition Of Air Conditioning 11. Ductwork and Filter (Downflow) Exploded View of Sub-Base for Furnace ONLY i!i ii Sub-base for Combustible Floors -Downflow Coil Adapter Box Condensate Line Raised by Base Non-Combustible Floor Duct Connections o Startup GasSupply Pressure Manifold Gas Pressure Adjustment 2. Turn gas ON. Operate the furnace by using a jumper wire on wiseto decrease manifold pressure and clockwise to Natural Gas Input Rating Check Example Orifice Sizing FIRE, EXPLOSION, CARBON MONOXIDE POISONING HAZARD. MANIFOLDPRESSUREAND ORIFICE SIZE FORHIGH ALTITUDEAPPLICATIONS NATURAL GAS MANIFOLD PRESSURE (" w.c.) High Altitude Air Pressure Switch Changing Orifices Manifold LP Conversion Main Burner Flame Check Ignitor Location Air TemperatureRise Check REDUCED FURNACE LIFE HAZARD Changing Blower Speed Continuous-Fan Operationusing "G" Hard Wired Continuous-Fan Operation 13. Furnace Maintenance 14. Sequence of Operation & Diagnostics Cooling () Request: Continuous Circulating Fan (G) Request: Continuous Circulating Fan Hard-Wired (Cont) Request: Heating (W) Request: Heating Request with Gas Shut Off: Control Board Diagnostic Codes (See Figure 40) * Proper flame sense microamps: 0.7 microamps D.C. minimum 2.0 - 4.0 microamps nominal Control Board II I I I Models ALL Models(N8MPN) GasType NatI LP NatI LPNatI NatI NatI NatI NatI LP NatI THIS DATA IS SUBJECT TO CHANGE WITHOUT NOTICE 44101261302 ALL Models(N8MPL) OasType .atI LP .atI LP .at .at .at .at .at I LP 441ol261302 THIS DATA IS SUBJECT TO CHANGE WITHOUT NOTICE [_1 ALL Models(*8MPN) THIS DATA IS SUBJECT TO CHANGE WITHOUT NOTICE 44101261302 ALL Models(*8MPL) OasType .at l,P .at I LP .at I LP .atl'P .at l_P .at l_P 441Ol261302 THIS DATA IS SUBJECT TO CHANGE WITHOUT NOTICE [_1 Mao,o,dPress._,och'sWC_3.5I10.0 3.5I10.0 3.5I10.0 3.5I10.0 3.5I10.0 3.5I10.0 15. Circulation Air Blower Data (CFM) 1 I IIMAxO Ms THIS DATA IS SUBJECT TO CHANGE WITHOUT NOTICE 44_01261302 1 C 1 IIIMAxO Ms 44101261302 THIS DATA IS SUBJECT TO CHANGE WITHOUT NOTICE [_1 N8MPN/L125J22(2)(6) _ISMPN150J20(2)(7)*DenotesBrand + + III, _ --R R-- -@ HOT END.,ERLOC.' O=O. --o -- -_ ,EUTRAL I L SWITCH f_._ . / I--g%RESSURESW,TCHY_GNTER" I+" I ,,OUCER N 211o. II,DU_ER%I_.ICAPACITOR a_" o_ ........... _ -o , +,__:_ _ ._ _ o_, \ [Replacement Parts - N8MPN (NaturalGas) I Page [Replacement Parts - N8MPN (NaturalGas) Page Page Page Parts for *8MPN/L x \ T Page Page | Page IReplacement Parts - *8MPL (NaturalGas) I | IReplacement Parts - 8MPL (NaturalGas) I