Sears Official Manual for Furnace Models - Comprehensive Guide
Page 43

HONEYWELL SV9541M "SMART VALVE" Sequence of Operation

 

I POWERAPPLIEDTO APPUANCE

l

 

 

 

I THERMOSTAT CALLS FOR HEAT

I

 

 

 

 

¢

 

WAITFOR PRESSURESWITCHESTO OPEN

 

 

I

PRESSURESWITCHESPROVEDOPEN?

 

 

 

i

 

 

 

 

 

I

COMBUSTIONBLOWER ENERGIZED

 

 

 

 

I

 

 

 

 

 

 

PRESSURESWITCHESCLOSEDWITHIN30 SEC-

 

COMBUSTIONBLOWERDE- ENERGIZED

 

 

 

ONDS?

_1_

_[

FIVE MINUTEWAIT PERIOD

 

3SECONDPRE-PURGE

 

 

 

 

 

PILOTVALVEOPENS:

 

I

 

 

 

 

 

 

 

 

IGNITORPOWERED(1)

 

L THREEFAILURESECONDRECYCLEFLAMEDELAY

 

 

 

PILOT LIGHTSAND FLAMEIS SENSED

I_uI

PILOTVALVECLOSES;

 

 

 

DURING90 SECONDTRAILFOR

 

PILOTIGNITOROFF

 

 

 

IGNITION?

 

 

 

 

J

_I YES

MAIN VALVE OPENS,

HEATING FAN "ON" DELAY BEGINS

AFTERDELAY:CIRCULATINGBLOWER STARTS

I

 

I

YES

 

 

I CIRCULATINGBLOWER OFF AFTER DELAY

I

FLAME SENSE LOST?

 

+

 

 

 

 

 

.[ PILOT AND MAIN VALVECLOSE

 

 

THERMOSTAT CALL FOR HEAT ENDS

FLAME SENSE LOST MORE THAN FIVE

I

 

 

COMBUSTIONAIR BLOWER OFF AFTERPOST

 

 

TIMES INTHISCALL FOR HEAT?

J--PURGE

 

 

 

 

_ NO

I P,LOTANDMAINVALVECLOSE I

NO

YES

COMBUSTIONBLOWER DE- ENERGIZEDAFTER 30

SECONDPOST PURGE

(1)Ignitor "ON" for first 30 seconds of trial for ignition,then "OFF" for next 30 seconds. If the pilot has not lit, it turns back"ON" for the final 30seconds. The pilot valve remains energizedduring the entire 90 second trial for ignition.

NOTE: If main limit string opensandtakes longerthan 2 minutesto close, system goes intoI hour wait period.

ICIRCHLATBLOWEROFFNGAFTERDELAY I

/ WAFORNEXTCALLFOR.HEAT I

L

l

440O1102004

[_

Page 42 Page 44
Image 43
Page 42 Page 44
Contents SingleStage Table of ContentsYES KeepThis page for future reference YES NOESafety Rules FrozenWater Pipe Hazard InstallationLocation and Clearances Typical Upflow Installation Installation RequirementsTypical Downflow Installation Dimensions & Clearances Leveling Combustion Ventilation Air Air Openings and Connecting DuctsRequirements Ventilation Air Venting and Combustion Air CheckExample Unusually Tight ConstructionDirect Vent N9MP2 Models For Two Pipe InstallationVent and Combustion Air Piping Single Pipe N9MP1 ModelsVent and Combustion Air Piping Guidelines TocompensateforoxygenburnedSee.Confined Space InstallaPiping Insulation Guidelines Contaminated Combustion AirCarbon Monoxide POISONING, Fire and Explosion Hazard Sizing Combustion Air and Vent PipeN9MP1 & *9MPD Models Vent Termination ClearancesClearance Description 440O110200415cmforappliances10,OOOBTUH3kW,12 Condensate Drain Trap Freeze Protection CondensateDrain TrapUpflow Installations Top Vent See Figure Upflow Installations Top VentSide View UpflowInstallationsVentthru LeftSideUpflow Installations Vent thru Left Side See Figure SwitchAll Models Vent thru Right Side See Figure All ModelsVentthru RightSideOnly Downflow Left Side Vent and Trap SeeFigure Inlet 4=Coupling & Clamps 112ID Drain Hose On Some Downflow Right Side Vent and TrapDownflow Right Side Vent and Trap See Figure PVC 3/4Horizontal Left-Thru Top See Horizontal Left Thru TopHorizontal Left-Side Vent Horizontal Left-Side Vent See FigureRelief Tube Extension Horizontal Right thru TopYellowor black 16ID Rubber Tube\\Horizontal Right Side Vent SeeFigure HorizontalRight-SideVentTee Trap Connecting Tee Trap to Condensate Trap and Main Drain LineConnecting Vent and Combustion Air Piping Open TeeFire Hazard Connecting Vent Pipes and TerminationProper Sealing Procedure for Combustion Vent Pipe ConnectionVent Termination Shielding Using Exterior RisersHorizontal Termination Vertical TerminationCmbustincncentricRoof -AirTerminationventand Multi Vent Termination ClearancesConcentric Vent and Combustion Air Sidewall Termination Sidewall Inlet Vent and Exhaust Air TerminationIAIternate Input Ratings, USA only Manifold Gas Pressure AdjustmentSupply Pressure Gas Supply PressureTai NaturalPressure For the 50,000, 75,000, 100,000 and 125,000 Btuh ModelsChanging Orifices High Altitude Air Pressure SwitchGeneral Derating Rules Electrical SHOCK, Fire or Explosion HazardValve Gas Piping RequirementsManual shut- off Low PressureHumidifier/Electronic Air Cleaner Electrical WiringInstallations Power SupplyWiringMountedto eithertheleftorright Fan Delay DIP Switch SettingsFan Timer Connections Reduced Furnacelife HazardInsulation InstallationDuctwork and Filter SizingDownflow applications, unless installing on non Filter Installation using Optional Filter RackDownflow Furnace Installation Combustible Floor InstallationFloorDimensions SubbasesforCombustibleFloorsDimensionsFurnace Subbase Startup Checks and AdjustmentsAdjust Pilot Burner Gas SupplyPressureReduced Furnace Life Hazard Temperature Rise CheckHeating and Continuous BlowerSpeed Same Changing Blower SpeedFIRE, EXPLOSION, or Carbon Monoxide Hazards Furnace MaintenanceHeating W Request Circulating Fan G RequestHeating Request with Gas Supply Line Shut Off Than Gas Valve Diagnostic Codes See FigureTypical Gas Valve Honeywell OFFHoneywell SV9541M Smart Valve Sequence of Operation Indicates Honeywell SV9541M Smart Valve Trouble shootingFlashes Flashes + I Flash LEDLED INDICATESCHECK/REPAIR Concentric TerminationVent Termination Clearances Concentric Vent Termination Kit #TicalterminationispreferredFieldsuppliedpipeandfittingsare RequiredtocompletetheinstallationRoof Overhang Rain Cap to Vent Pipe AssemblyConcentric Vent and Combustion Air Side Termination Table for N9MP2 Models 50,000 & 80,000 Btuh FurnacesAir Elbow Concentric Vent Sidewall Attachment25-22-02 25-23-30 N9MP2075B12B1 N9MP2080F16B1N9MP2100F14B1 N9MP2100J20B1 N9MP2125J20B1 Denotes BrandSpecifications N9MP1 Model SpecificationsGeneral Gas & Ignition Specifications N9MP2BlowerData Specifications 9MPDFor 080 Models 4 Ton 19 & 22314 Units For 050 Models 3 Ton UnitsFor 075 Models 3 Ton Units For 100 Models Ton 19 & 22314 UnitsUI I BKw IlttlNeutral t Data25-23-95 100J 125J Key Description PartFunctional 125J12B 16B 14B Non-Functional1GB 14B 20B16B 14B 20B 12B No. Non-FunctionalNAHF002LP Key DescriptionN9MP1 N9MP2 Osob Part not IllustratedCapacitor,7.SMfd.,370V 9MPDNumber 080F12B 075F12B 080J16B 100J14B 100J20B 128L20B125L20B Parts *gMPDKeyDescription No.Non- Functional Number 050F12B 078F12B 080J16B 100J14B 100J2OB080J16B Part GMPDNon- Functional Number 050F12B 075F12BIOOJ20B 1013816 + Order from Service Parts 44001Non- Functional Number 050F12B 075F12B 080J16B 100J14B

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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