Sears N9MP2, N9MP1, 9MPD manual Honeywell SV9541M

Page 42

HONEYWELL SV9541M

IPOWERAPPLIEDTO APPLIANCE

+

I THERMOSTATCALLS FORHEAT

¢

IPRESSURE SWITCHES PROVED OPEN?

ICOMBUSTIONBLOWER ENERGIZED

PRESSURESWITCHESCLOSEDWITHIN30 SEC- ONDS?

+

I3SECONDPRE-PURGE

PILOTVALVEOPENS: IGNITORPOWERED(1)

PILOTLIGHTSAND FLAME ISSENSED DURING 90SECOND TRAILFOR IGNITION?

I YES

MAIN VALVEOPENS,

HEATINGFAN "ON" DELAYBEGINS

+

I AFTERDELAY:CIRCULATINGBLOWERSTARTS

FLAME SENSE LOST?

"SMART VALVE" Sequence of Operation

I

WAIT FORPRESSURESWITCHESTO OPEN

_._

COMBUSTIONBLOWER DE-ENERGIZED

J__

FIVEMINUTE WAIT PERIOD

I

FAILURETHREESECONDFLAMERECYCLEDELAY,J_

l'_Vl PILOTVALVECLOSES;

 

PILOT IGNITOROFF

r

I

YES

 

 

 

CIRCULATINGBLOWEROFF AFTER DELAY

I

I

 

+

 

 

 

PILOTAND MAIN VALVECLOSE

1

 

THERMOSTATCALL FORHEAT ENDS

L FLAMETIMES INSENSETHISCALLLOSTFORHEAT?MORETHAN FIVE

COMBUSTIONAIR BLOWER OFF AFTERPOST

PURGE

NO

PILOTAND MAIN VALVECLOSE

+

COMBUSTIONBLOWER DE- ENERGIZEDAFTER 30

SECONDPOST PURGE

+

I CIRCULATINGBLOWEROFF AFTER DELAY

I

IWAIT FOR NEXTCALL FOR HEAT

I

NO

YES

(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 30 seconds. The pilot valve remains energized during the entire 90 second trial for ignition.

NOTE: If main limit string opens and takes longer than 2 minutes to close, system goes into I hour wait

period.

I

[_

44001 111400

Page 41 Page 43
Image 42
Page 41 Page 43
Contents SingleStage JellJill Denotes BrandMP D 0 75 F 12 a # 440 01 1114Furnace/Drip- Leg? YES Date of Start-UpCO2 ? Frozen Water Pipe Hazard Frozen and Burst Water Pipe HazardLocation and Clearances InstallationTypical Upflow Installation Winter ShutdownFurnace Installation Considerations Installation RequirementsInstallation Positions LevelingAiRI.TAKE Dimensions & ClearancesVENTrgMPD TOPHorizontal Furnace Installation Combustion & Ventilation Air For Single Pipe InstallationAir Openings and ConnectingDucts Confined Space Installation RequirementsUnconfined Space Installation EhrFree Area Make the Following Check Venting and Combustion Air CheckVent Check HoodDirect Vent N9MP2 Models Vent and Combustion Air PipingSingle Pipe N9MP1 Models Dual Certified gMPDModelsPipe Diameter Table N9MP2 Models Piping Insulation GuidelinesSizing Combustion Air and Vent Pipe Vent Termination ClearancesUnited States Only Condensate Drain TrapCondensate Drain Trap Freeze Protection Canada See Canadian Fuel Gas Code OtherThanDrainLine Upflow Installations Dual Certified *9MPD-A4 ModelsYellowPlasticCap TransitionSomemodels MountingScrews4Drain Models HorizontalLeft InstallationsDual Certified *9MPD-A4 25-24-12Rpeept.oT Switch HoseSi.g.Pre...reSwitch \ e.spre X3L/\Page ReturnAir Page Left Side Venting Satetrapandsecurewitha3/4clamp Boxandsecurewitha3/4clamp Drainstubonthetransitionandsecurewitha3/4clampStubonthecondensatetrapandsecurewitha3/4clamp VentFitting TPipe & Clamps InletReturn Air Return Modelsshownhave TwopressureswitchesCap Air ClampsLeft Vent Pipe Connection Connecting Vent and Combustion Air PipingCombustion Air Pipe Connection Dual Certified or PVCProper Sealing Procedure for Combustion Blower Horizontal TerminationVent Pipe Vertical Termination Using Exterior RisersCheckholesizesbymakingsureitissmallerthan the cou Vent Termination ShieldingSidewall Inlet Vent and Exhaust Air Termination Ei271Recommended Alternate Installation for Sustained ColdConcentric Vent and Combustion Air Sidewall Termination Rooftop Inlet Vent and Exhaust Air TerminationSupplyPressure Manifold Gas Pressure AdjustmentAlternate Btuh Input RatingsUSA Only Gas Supply PressureGeneral Derating Rules High Altitude Air Pressure SwitchChanging Orifices for High Altitude Changing OrificesNatural Gas Input Rating Check Typical Gas Piping for UpflowExample Humidifier/Electronic Air Cleaner Electrical WiringPower SupplyWiring Gas Piping RequirementsFan Timer Connections InstallationFan Delay DIP Switch Settings Ductwork and FilterInsulation Filter Installation using Optional Filter RackSizing FiltersAddition Of Air Conditioning Combustible Floor InstallationAvailablefromyourdistributor StandoffFilterRack Ubbase for Combustible FloorFurnace Subbase Coil CabinetTemperature Rise Check Checks and AdjustmentsAdjust Pilot Burner Main Burner Flame CheckChanging Blower Speed Tochecktemperaturerise,usethefollowingprocedureHeating and Continuous BlowerSpeed the Same Continuous Fan OperationHeating Request with Gas Supply Line Shut Off Gas Valve Diagnostic Codes See FigureCirculating Fan G Request OFFTypical Gas Valve Honeywell Honeywell SV9541M Flashes + Honeywell SV9541M Smart Valve Trouble shootingFlashes Flashes + SoftLockoutConcentric Termination Vent Termination ClearancesConcentric Vent Termination Kit # Arerequiredtocompletetheinstallation Concentric Vent Roof InstallationRain Cap to Vent Pipe Assembly Concentric Termination Kit NAHA001CV & NAHA002CV VentingConcentric Vent and Combustion Air Side Termination Concentric Vent Sidewall Attachment 25-22-02440011114O0 Save This Manual For Future Reference N9MP2075B12A4 N9MP2080F16A4N9MP2100F14A4 N9MP2100J20A4 N9MP2125J20A4 Denotes BrandSpecifications N9MP1 GeneralNAHA001LV NAHAO01LV NAHA002LV Specifications N9MP2Snap HW HSP Hwhsp PSC/I/2 PSC/II2Specifications 9MPD 3OONAHA00SLV For 100 Models 5 Ton 223/4 Units For 075 Models 3 Ton UnitsFor 100 Models Ton 19 & 22314 Units For 125 Models 5 Ton UnitsD22 Connection DiagramDisconnect Before Servicing Ladder Diagram = = =@O,c25-23-95 FF18125J Key Description PartFunctional 100J 125JLOOJ 125J Non-Functional Number 12A O50B 075B 080F LOOF LOOJ 125JIoof 1GA100F 100J KeyDescription No. Non-FunctionalNgMP1 050B 075B 080F 100F 100J 125J Number 16A 14A 20AGMPD Number KeyDescription No.FunctionalHeat Exchanger,Primary Heat Exchanger,Secondary 050F12AKeyDescription No.Non- Functional Models *9MPDO50F12A4, Natural Gas Replacement part supplied 080J16ANon- Functional Non-FunctionalKey Description Number

9MPD, N9MP1, N9MP2 specifications

The Sears N9MP2, N9MP1, and 9MPD are prominent models in the realm of residential heating systems, specifically designed to provide efficient and effective heating solutions. These models are part of Sears' commitment to quality and innovation, making them a popular choice among homeowners seeking reliability and performance.

The N9MP2 is a high-efficiency multi-speed gas furnace that boasts an impressive AFUE (Annual Fuel Utilization Efficiency) rating. This feature allows the furnace to convert a significant portion of fuel into usable heat, which effectively translates to lower energy bills for homeowners. The unit is equipped with a two-stage gas valve that provides increased comfort by adjusting the heating output based on demand, ensuring an even temperature throughout the home.

The N9MP1, like its counterpart, is known for its reliability and efficiency. It offers a single-stage operation that is ideal for homes needing consistent heating without the necessity for the more complex stages present in two-stage systems. This model also has a good AFUE rating, making it a cost-effective solution for families looking to reduce their heating expenses. Its design is tailored for easy installation and maintenance, allowing homeowners to keep their heating systems running at optimal performance without hassle.

The 9MPD model takes a step further with its advanced technology integration. It features a sophisticated control board that allows for easier diagnostics and enhanced system management. The 9MPD is also designed with quiet operation in mind, employing advanced sound-reduction technologies to minimize noise levels during heating cycles. Homeowners will appreciate the peace and quiet it brings, particularly in shared living spaces.

All three models are equipped with high-quality insulation and specialized heat exchangers that enhance their thermal efficiency. Additionally, they are designed with safety features such as automatic shut-off systems and robust flame rollout protection, ensuring a safe heating experience.

In terms of characteristics, these models are generally constructed with durable materials, designed to endure harsh weather conditions while providing consistent heating. They can be connected to various home automation systems, which adds to their appeal for tech-savvy consumers.

In conclusion, the Sears N9MP2, N9MP1, and 9MPD represent a comprehensive lineup of reliable, efficient, and technologically advanced heating systems suitable for contemporary homes. Their dedication to performance ensures that homeowners enjoy a warm and energy-efficient environment throughout the chilly seasons.
Top Page Image Contents