Sears N9MP2075B12B1 Checks and Adjustments, Gas SupplyPressure, Startup, Adjust Pilot Burner

Page 38

Condensate Line Raised by Base

25-20-52

8. Checks and Adjustments

FIRE OR EXPLOSION HAZARD.

Failure to turn OFF gas at shut off before

connecting manometer could result in death, personal injury and/or property damage.

Turn OFF gas at shut off before connecting manometer.

Startup

NOTE: Refer to the start-up procedures in the "User's Information

Manual' or to the "Operating Instructions Label' on the furnace.

FIRE OR EXPLOSION HAZARD.

Failure to correct hazard could result in death, personal injury, and/or property damage.

If any sparks, odors or unusual noises occur, immediately shut OFF power to furnace. Check for wiring errors or obstruction to blower.

Gas SupplyPressure

Gas supply pressure should be within minimum and maximum val- ues listed on rating plate. Pressures are usually set by gas suppli- ers.

Manifold Gas Pressure Adjustment

NOTE: Make adjustment to manifold pressure with burners oper- ating.

1.Remove the burner compartment door.

2.With gas OFF, connect manometer to tapped opening on gas valve. Use manometer with a 0 to 15" water column range.

3.Turn gas ON and remove adjustment screw cover on gas

valve. Turn counterclockwise to decrease pressure and clockwise to increase.

4.For altitudes up to 2000', set pressure to value shown in Table 6 or Table 8, _+0.3" (8ram) water column. For alti-

tudes of 2000' to 8000', see Section 5 for correct pressure setting.

Adjust Pilot Burner

The furnace has a pilot flame to light the main burner. The flame should surround 3/8' to 1/2' of the flame sensor. See Figure 42. To

adjust, remove cap from pilot adjusting screw on gas valve. Turn

screw counterclockwise to increase or clockwise to decrease

flame as required. Replace adjusting screw cap.

Pilot Burner

Proper Flame

Adjustment

3/8" to 1/2"

Hot Surface

Igniter

10-11-65

Main Burner Flame Check

Allow the furnaceto run approximately 10 minutes then inspect the main burner and pilot flames. See Figure 43.

Check for the following (Figure 43):

•Stable and blue flames. Dust may cause orange tips or wisps of yellow, but flames MUST NOT have solid, yellow tips.

•Flames extending directly from burner into heat ex- changer.

•Flames do NOT touch sides of heat exchanger.

If any problems with main burner flames are noted, it may be nec- essary to adjust gas pressures, or check for drafts.

[_

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Contents Table of Contents SingleStageYES NOE KeepThis page for future reference YESSafety Rules Location and Clearances InstallationFrozenWater Pipe Hazard Typical Downflow Installation Installation RequirementsTypical Upflow Installation Dimensions & Clearances Leveling Requirements Air Openings and Connecting DuctsCombustion Ventilation Air Unusually Tight Construction Venting and Combustion Air CheckExample Ventilation AirSingle Pipe N9MP1 Models For Two Pipe InstallationVent and Combustion Air Piping Direct Vent N9MP2 ModelsContaminated Combustion Air TocompensateforoxygenburnedSee.Confined Space InstallaPiping Insulation Guidelines Vent and Combustion Air Piping GuidelinesVent Termination Clearances Sizing Combustion Air and Vent PipeN9MP1 & *9MPD Models Carbon Monoxide POISONING, Fire and Explosion Hazard440O1102004 Clearance Description15cmforappliances10,OOOBTUH3kW,12 CondensateDrain Trap Condensate Drain Trap Freeze ProtectionUpflow Installations Top Vent Upflow Installations Top Vent See FigureSwitch UpflowInstallationsVentthru LeftSideUpflow Installations Vent thru Left Side See Figure Side ViewOnly All ModelsVentthru RightSideAll Models Vent thru Right Side See Figure Inlet 4= Downflow Left Side Vent and Trap SeeFigurePVC 3/4 Downflow Right Side Vent and TrapDownflow Right Side Vent and Trap See Figure Coupling & Clamps 112ID Drain Hose On SomeHorizontal Left Thru Top Horizontal Left-Thru Top SeeHorizontal Left-Side Vent See Figure Horizontal Left-Side Vent16ID Rubber Tube\\ Horizontal Right thru TopYellowor black Relief Tube ExtensionHorizontalRight-SideVent Horizontal Right Side Vent SeeFigureOpen Tee Connecting Tee Trap to Condensate Trap and Main Drain LineConnecting Vent and Combustion Air Piping Tee TrapVent Pipe Connection Connecting Vent Pipes and TerminationProper Sealing Procedure for Combustion Fire HazardVertical Termination Using Exterior RisersHorizontal Termination Vent Termination ShieldingSidewall Inlet Vent and Exhaust Air Termination Multi Vent Termination ClearancesConcentric Vent and Combustion Air Sidewall Termination CmbustincncentricRoof -AirTerminationventandGas Supply Pressure Manifold Gas Pressure AdjustmentSupply Pressure IAIternate Input Ratings, USA onlyFor the 50,000, 75,000, 100,000 and 125,000 Btuh Models NaturalPressure TaiElectrical SHOCK, Fire or Explosion Hazard High Altitude Air Pressure SwitchGeneral Derating Rules Changing OrificesLow Pressure Gas Piping RequirementsManual shut- off ValvePower SupplyWiring Electrical WiringInstallations Humidifier/Electronic Air CleanerReduced Furnacelife Hazard Fan Delay DIP Switch SettingsFan Timer Connections Mountedto eithertheleftorrightSizing InstallationDuctwork and Filter InsulationCombustible Floor Installation Filter Installation using Optional Filter RackDownflow Furnace Installation Downflow applications, unless installing on nonFurnace Subbase SubbasesforCombustibleFloorsDimensionsFloorDimensions Gas SupplyPressure Checks and AdjustmentsAdjust Pilot Burner StartupChanging Blower Speed Temperature Rise CheckHeating and Continuous BlowerSpeed Same Reduced Furnace Life HazardFurnace Maintenance FIRE, EXPLOSION, or Carbon Monoxide HazardsHeating Request with Gas Supply Line Shut Off Circulating Fan G RequestHeating W Request OFF Gas Valve Diagnostic Codes See FigureTypical Gas Valve Honeywell ThanHoneywell SV9541M Smart Valve Sequence of Operation LED Honeywell SV9541M Smart Valve Trouble shootingFlashes Flashes + I Flash IndicatesConcentric Vent Termination Kit # Concentric TerminationVent Termination Clearances LED INDICATESCHECK/REPAIRRequiredtocompletetheinstallation TicalterminationispreferredFieldsuppliedpipeandfittingsareTable for N9MP2 Models 50,000 & 80,000 Btuh Furnaces Rain Cap to Vent Pipe AssemblyConcentric Vent and Combustion Air Side Termination Roof Overhang25-22-02 Concentric Vent Sidewall AttachmentAir Elbow Denotes Brand N9MP2075B12B1 N9MP2080F16B1N9MP2100F14B1 N9MP2100J20B1 N9MP2125J20B1 25-23-30General Model SpecificationsSpecifications N9MP1 Specifications N9MP2 Gas & IgnitionSpecifications 9MPD BlowerDataFor 100 Models Ton 19 & 22314 Units For 050 Models 3 Ton UnitsFor 075 Models 3 Ton Units For 080 Models 4 Ton 19 & 22314 UnitsData IlttlNeutral t UI I BKw25-23-95 125J Key Description PartFunctional 100J 125J14B 20B Non-Functional1GB 12B 16B 14BNo. Non-Functional 16B 14B 20B 12BPart not Illustrated Key DescriptionN9MP1 N9MP2 Osob NAHF002LP100J20B 128L20B 9MPDNumber 080F12B 075F12B 080J16B 100J14B Capacitor,7.SMfd.,370VNumber 050F12B 078F12B 080J16B 100J14B 100J2OB Parts *gMPDKeyDescription No.Non- Functional 125L20BNumber 050F12B 075F12B Part GMPDNon- Functional 080J16B050F12B 075F12B 080J16B 100J14B 1013816 + Order from Service Parts 44001Non- Functional Number IOOJ20B

9MPD100J20B1, N9MP2100J20B1, 9MPD050F12B1, N9MP1100J20B1, N9MP1125J20B1 specifications

The Sears N9MP1075B12B1, N9MPD125L20B1, N9MP1050B12B1, N9MPD080J16B1, and N9MP2125J20B1 are part of the trusted line of gas furnaces manufactured by Sears, specifically designed to deliver reliable heating solutions for residential applications. These models incorporate cutting-edge technology and robust engineering, making them popular choices among homeowners looking for efficiency and comfort.

One of the main features of these models is their high-efficiency operation. With Annual Fuel Utilization Efficiency (AFUE) ratings exceeding 90%, these furnaces convert a significant portion of fuel into usable heat, thereby reducing energy costs. The N9MP series employs a multi-speed blower system that optimizes airflow for enhanced comfort while minimizing noise levels, ensuring a pleasant indoor environment.

The N9MPD125L20B1 and N9MPD080J16B1 variants highlight their adaptability through dual-stage heating capabilities. This technology allows the furnace to adjust its output based on the thermal demands of the home, preventing energy wastage during milder conditions while providing robust heating during extreme cold spells. The two-stage combustion process not only improves comfort but also contributes to lower greenhouse gas emissions.

Durability is another hallmark of these Sears models. With heavy-duty heat exchangers crafted from high-quality materials, they are built to withstand the rigors of regular use. Additionally, the inclusion of advanced safety mechanisms ensures that the system operates securely, reducing potential risks associated with gas furnaces.

The N9MP2125J20B1 model stands out due to its whisper-quiet operation. Homeowners can enjoy a warm home without the disruptive sound commonly associated with traditional heating systems, thanks to the insulated cabinet design and efficient blower operation.

Furthermore, these models come equipped with user-friendly digital thermostats, which allow precise temperature control and programmable settings, enabling homeowners to tailor their heating needs to fit their lifestyle. The compatibility with smart home systems also adds convenience, enabling users to manage their heating remotely, saving even more energy.

In conclusion, the Sears N9MP1075B12B1, N9MPD125L20B1, N9MP1050B12B1, N9MPD080J16B1, and N9MP2125J20B1 gas furnaces exemplify innovation in heating technology. Their energy-efficient designs, advanced features, and durable construction make them reliable choices for homeowners seeking comfort and sustainability in their heating solutions.
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