Sears N9MP2, N9MP1, 9MPD Tochecktemperaturerise,usethefollowingprocedure, Changing Blower Speed

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Tochecktemperaturerise,usethefollowingprocedure:

1.Placethermometersinsupplyandreturnairregistersas closetofurnaceaspossible,avoidingdirectradiantheat fromheatexchangers.

2.Operatefurnacecontinuouslyfor15minuteswithallregis- tersandductdampersopen.

3.Takereadingandcomparewithrangespecifiedonrating plate.

4.IfthecorrectamountoftemperatureriseisNOTobtained,it maybenecessarytochangeblowerspeedAhigherblow.- erspeedwilllowerthetemperaturerise.A lowerblower speedwillincreasethetemperaturerise.

Changing Blower Speed

Change the heat or cool blower motor speed by removing the motor lead from the "Heat" or "Cool" terminal and re-

place it with the desired motor speed lead from the "Un- used Motor Lead" location. Connect the wire previously removed from the "Heat" or "Cool" terminal to the vacated

"Unused Motor Lead" terminal.

If the same speed must be used for both heating and cool-

ing, remove the undesired motor speed lead from the "Heat" or"Cool" terminal and connect that lead to the open

terminal at "Unused Motor Lead" location. Attach a jump- er between the "Heat" and "Cool" terminals and the re-

maining motor speed lead.

Note: For motors with (4) speed leads, it will be necessary to tape off the terminal of the motor speed lead removed from the "Heat" or "Cool" terminal with electrical tape since

an open terminal will not be available at the "Unused Mo- tor Lead" location.

ELECTRICAL SHOCK HAZARD

Failure to do so can result in death and/or personal injury.

Turn OFF power to furnace before changing speed taps.

NOTE: The speed taps that the manufacturer sets from the facto- ry for this product are based on a nominal 400 CFM per ton cool-

ing and the basic mid range on the temperature rise for heating.

Since the manufacturer cannot establish the static pressure that

will be applied to the unit, it is the responsibility of the installer

dealer/contractor to select the proper speed taps for the applica- tion when the unit is installed.

If it is necessary to change speeds, refer to steps below.

1.Refer to Furnace WiringDiagramfor location of the heating and cooling speed taps located on the electronic fan control as well as location of unused blower motor speed leads. Use the chart (Table 9) to determine the blower motor speed settings.

_iiiii:!

Blower

Speed Chart

i;iiii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii ii

 

 

Wire Color

Motor Speed

Black

 

High

Orange*

 

Med-High

Blue

 

Medium

Red

 

Low

* Med-High speed may not be provided on all models.

Continuous Fan Operation

A terminal is provided on the electronic fan control located in the

circulating blower compartment for operation of the continuous

fan option. This connection is intended for the low speed motor tap, and has a lower contact rating (8 amps) than the heat and cool taps. When the low speed blower lead is connected to this terminal, this will provide low speed blower operation whenever the other two speeds (Heat or Cool) are not energized.

Thoroughly check the system after modification to ensure the

proper operation of the circulating air blower in all modes of opera- tion.

Separate speed selections for Heat, Cool, and

Continuous Fan

Connect low speed lead from circulating motor to the "Cont." ter-

minal at the electronic fan control. The appropriate motor leads should already be connected to the "Heat" and "Cool" terminals.

Heating and Continuous BlowerSpeed the Same

If it is necessary to operate the heating speed and continuous blower speed using the same blower speed, connect ajumper be- tween the "Heat" and "Cont." terminals on the electronic fan con- trol.

Note: There should be only ONE motor lead going to the "Heat" and "Cont." terminals.

9.Furnace Maintenance

CAUTION

See "User "s Information Manual" and the "Service Manual".

It is recommended that the furnace be inspected and serviced on an annual basis (before the heating season) by a

qualified service technician.

44001 111400

[_

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Contents SingleStage 440 01 1114 Denotes BrandMP D 0 75 F 12 a # JellJillFurnace/Drip- Leg? YES Date of Start-UpCO2 ? Frozen and Burst Water Pipe Hazard Frozen Water Pipe HazardWinter Shutdown InstallationTypical Upflow Installation Location and ClearancesLeveling Installation RequirementsInstallation Positions Furnace Installation ConsiderationsTOP Dimensions & ClearancesVENTrgMPD AiRI.TAKEConfined Space Installation Requirements Combustion & Ventilation Air For Single Pipe InstallationAir Openings and ConnectingDucts Horizontal Furnace InstallationUnconfined Space Installation EhrFree Area Hood Venting and Combustion Air CheckVent Check Make the Following CheckDual Certified gMPDModels Vent and Combustion Air PipingSingle Pipe N9MP1 Models Direct Vent N9MP2 ModelsVent Termination Clearances Piping Insulation GuidelinesSizing Combustion Air and Vent Pipe Pipe Diameter Table N9MP2 ModelsCanada See Canadian Fuel Gas Code OtherThan Condensate Drain TrapCondensate Drain Trap Freeze Protection United States OnlyTransition Upflow Installations Dual Certified *9MPD-A4 ModelsYellowPlasticCap DrainLineSomemodels MountingScrews4Drain 25-24-12 HorizontalLeft InstallationsDual Certified *9MPD-A4 Models\ e.spre X3L/\ Switch HoseSi.g.Pre...reSwitch Rpeept.oTPage ReturnAir Page Left Side Venting Satetrapandsecurewitha3/4clamp Boxandsecurewitha3/4clamp Drainstubonthetransitionandsecurewitha3/4clampStubonthecondensatetrapandsecurewitha3/4clamp VentFitting TPipe & Clamps InletReturn Air Air Clamps Modelsshownhave TwopressureswitchesCap ReturnLeft PVC Connecting Vent and Combustion Air PipingCombustion Air Pipe Connection Dual Certified or Vent Pipe ConnectionProper Sealing Procedure for Combustion Blower Horizontal TerminationVent Pipe Vent Termination Shielding Using Exterior RisersCheckholesizesbymakingsureitissmallerthan the cou Vertical TerminationRooftop Inlet Vent and Exhaust Air Termination Ei271Recommended Alternate Installation for Sustained ColdConcentric Vent and Combustion Air Sidewall Termination Sidewall Inlet Vent and Exhaust Air TerminationGas Supply Pressure Manifold Gas Pressure AdjustmentAlternate Btuh Input RatingsUSA Only SupplyPressureChanging Orifices High Altitude Air Pressure SwitchChanging Orifices for High Altitude General Derating RulesNatural Gas Input Rating Check Typical Gas Piping for UpflowExample Gas Piping Requirements Electrical WiringPower SupplyWiring Humidifier/Electronic Air CleanerDuctwork and Filter InstallationFan Delay DIP Switch Settings Fan Timer ConnectionsFilters Filter Installation using Optional Filter RackSizing InsulationUbbase for Combustible Floor Combustible Floor InstallationAvailablefromyourdistributor StandoffFilterRack Addition Of Air ConditioningCoil Cabinet Furnace SubbaseMain Burner Flame Check Checks and AdjustmentsAdjust Pilot Burner Temperature Rise CheckContinuous Fan Operation Tochecktemperaturerise,usethefollowingprocedureHeating and Continuous BlowerSpeed the Same Changing Blower SpeedOFF Gas Valve Diagnostic Codes See FigureCirculating Fan G Request Heating Request with Gas Supply Line Shut OffTypical Gas Valve Honeywell Honeywell SV9541M Flashes + SoftLockout Honeywell SV9541M Smart Valve Trouble shootingFlashes Flashes +Concentric Termination Vent Termination ClearancesConcentric Vent Termination Kit # Concentric Vent Roof Installation ArerequiredtocompletetheinstallationRain Cap to Vent Pipe Assembly Concentric Termination Kit NAHA001CV & NAHA002CV VentingConcentric Vent and Combustion Air Side Termination 25-22-02 Concentric Vent Sidewall Attachment440011114O0 Denotes Brand N9MP2075B12A4 N9MP2080F16A4N9MP2100F14A4 N9MP2100J20A4 N9MP2125J20A4 Save This Manual For Future ReferenceGeneral Specifications N9MP1PSC/I/2 PSC/II2 Specifications N9MP2Snap HW HSP Hwhsp NAHA001LV NAHAO01LV NAHA002LVSpecifications 9MPD 3OONAHA00SLV For 125 Models 5 Ton Units For 075 Models 3 Ton UnitsFor 100 Models Ton 19 & 22314 Units For 100 Models 5 Ton 223/4 Units= = =@O,c Connection DiagramDisconnect Before Servicing Ladder Diagram D22FF18 25-23-95100J 125J Key Description PartFunctional 125J1GA O50B 075B 080F LOOF LOOJ 125JIoof LOOJ 125J Non-Functional Number 12A16A 14A 20A KeyDescription No. Non-FunctionalNgMP1 050B 075B 080F 100F 100J 125J Number 100F 100J050F12A KeyDescription No.FunctionalHeat Exchanger,Primary Heat Exchanger,Secondary GMPD NumberKeyDescription No.Non- Functional 080J16A Models *9MPDO50F12A4, Natural Gas Replacement part suppliedNumber Non-FunctionalKey Description Non- Functional

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.