Sears N8MPN100F20B1 Changing Blower Speed, Ignitor Location, Reduced Furnace Life Hazard

Page 31

Ignitor Location

NOTE: Flame sensor has a different orientation in all 050 models.

Air TemperatureRise Check

REDUCED FURNACE LIFE HAZARD

Failure to properly set the air temperature rise may

result in reduced furnace life.

Use ONLY the blower motor speed taps marked "Y" for YES for setting air temperature rise.

Blower Motor Speed Taps for

NSMPNtL and *8MPN/L Model Sizes

ModelSizes

LO

M LO

M HI

HI

RED

BLUE

ORN

BLK

 

050B12

N

Y

Y

N

075B12

N

Y

Y

Y

075F16

N

N

Y

Y

100F14

N

N

Y

Y

100F20

N

Y

Y

Y

100J20

N

Y

Y

Y

100J22

Y

Y

Y

N

125J20

N

Y

Y

Y

125J22+

Y

Y

Y

Y

150J20{

N

Y

Y

Y

+N8MPN only

{ _8MPN only

 

 

 

The blower speed MUST be set to give the correct air temperature rise through the furnace as marked on the rating plate. Tempera- ture rise is the difference between supply and return air tempera- tures.

To check temperature rise, use the following procedure:

1.Place thermometers in supply and return air registers as close to furnace as possible, avoiding direct radiant heat from heat exchangers.

2.Operate furnace for 10 minutes with all the registers and duct dampers open by using a jumper wire on R to W thermostat

connections on the fan board.

3, Take readings and compare with range specified on rating plate.

4.If the air temperature rise is not in the correct range, the blow- er speed must be changed. A higher blower speed will lower

the temperature rise. A lower blower speed will increase the

temperature rise.

5.Removethe ULU.m._erwire after the adiustments are complete.

Changing Blower Speed

ELECTRICAL SHOCK HAZARD.

Failure to disconnect power could result in death, personal injury and/or component damage.

Turn OFF power to furnace before changing speed taps.

NOTE: The speed taps that the manufacturer sets at the factory for this furnace are based on a nominal 400 CFM per ton cooling

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

Since the manufacturer cannot predict the static pressure

that will be applied to the furnace, it is the responsibility of the

installer dealer/contractor to select the proper speed tap

leads for the application when the furnace is installed. If it is necessary to change speeds, refer to steps below.

1.Refer to Furnace Wiring Diagram for location of the heating and cooling speed taps located on the electronic furnace con- trol as well as location of unused blower motor speed leads. Use the chart (Table 8 ) to determine the blower motor speed settings.

I Blower

Speed Chart

 

Wire Color

Motor

Speed

Black

High

Orange*

Med-

High

Blue

Med-Low

Red

Low

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

2.Change the heat or cool blower motor speed by removing the motor speed lead from the "Heat" or "Cool" terminal and re- place it with the desired motor speed lead from the "M1" or "M2" location. Connect the wire previously removed from the "Heat" or "Cool" terminal to the vacated "M1" or "M2" termi- nal.

3.If the same speed must be used for both heating and cooling, remove the undesired motor speed lead from the "Heat" or "Cool" terminal and connect that lead to the open terminal at "MI" or "M2" location or tape off. Attach a jumper between

the "Heat" and "Cool" terminals and the remaining motor speed lead.

Note: When using the same speed on 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 "M1" or "M2" location.

Thoroughly check the system after modification to ensure the proper operation of the circulating air blower in all modes of opera- tion.

Continuous-Fan Operation using "G"

Energizing the"G" terminal on the furnace control provides contin-

uous fan operation. This is done by connecting the G terminal of the thermostat to the G terminal on the furnace control. When the

FAN switch is turned from auto to ON the fan will operate continu- ously at "HEAT" speed. EAC will be energized in this mode.

NOTE: In heating, the fan will turn off during furnace ignition and warm up then restart at heating speed.

Hard Wired Continuous-Fan Operation

A terminal is provided on the furnace control board located in the

circulatinq, air blower compartment for operation of the continu-

441 01 261302

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Contents 80+SingleStage Dealer Name AddressLimit Opens Drip-Leg Upstream of Gas Valve? Yesi NOIFIRE, EXPLOSION, and Asphixiation Hazard Safe Installation RequirementsCarbon Monoxide Poisoning Hazard Installation RequirementsFrozen Water Pipe Hazard Location and ClearancesReturnAir Dimensions and Clearances N8MPN/LDimensional Information Furnace41I Installation PositionsFurnace Installation Dimensions and Clearances *8MPN/L ModelsFire Hazard Typical Horizontal InstallationHorizontal DownflowBurn Hazard Pressure Switch RelocationRotating the Venter Assembly Side VentingRequirements Air Openings and Connecting DuctsCombustion & Ventilation Air Outdoor Combustion Air MethodFreeArea ThisinstallationNOTapprovedin CanadaSoffitVen Indoor Combustion AirAndventilationair Fromindoors ft MINIMUMSPACEVOLUMEFOR100%COMBUSTIONVentilation Air Category I Safe Venting RequirementsLowing Check Venting and Combustion Air CheckVenting to Existing Masonry Chimney Vent CheckCombined Venting into a Masonry Chimney Category I Furnaces With External Power VentersHorizontal Venting Vent TerminationIviventterminal Authority having jurisdiction approves Masonry Chimney VentingChimney Inspection Failure to properly vent this furnace could resultSll Chimney Inspection ChartNfpa & AGA FAN+NAT Installations withType-B Double-Wall Vent Connectors Exterior Masonry ChimneyTypical Gas Piping N8MP Gas Supply and PipingVentdampersonanyapplianceconnectedto the common vent Gas PressuresPiping with Close Nipples and Standard Elbows Left Side Gas Supply Piping N8MPPiping with Street Elbows Fire or Explosion Hazard Final CheckTypical Gas Piping aMP Piping with Street ElbowsThermostat Electrical WiringPower Supply Wiring Box RelocationDuct Design Ductwork and Filter Upflow/HorizontalFurnace Control Furnace Control FuseRisk of Reduced Furnace Life Duct Installation RequirementsFilters High-Velocity Air Filter Sizes max600FPM20 x 25 Optional Filter Rack Optional Filter Rack Installation Side ReturnInternal Filter in Bottom- Return Installation Addition Of Air ConditioningSub-Bases for Combustible Floors Furnace Only Sub-bases For Combustible Floors DimensionsDuctwork and Filter Downflow Outlet Duct FlangeNon-Combustible Floor Exploded View of Sub-Base for Furnace onlySub-base for Combustible Floors Downflow Coil Adapter BoxManifold Gas Pressure Adjustment Checks and AdjustmentsStartup Operation Above 2000 Altitude Orifice SizingWiseto decreasemanifoldpressureand clockwiseto Natural Gas Input Rating CheckNatural GAS Manifold Pressure w.c High Altitude Air Pressure SwitchI! i! i I! i! i! i! i Changing OrificesRemoving NOx inserts LP ConversionMain Burner Flame Check FIRE, EXPLOSION, Unit Damage HazardReduced Furnace Life Hazard Hard Wired Continuous-Fan OperationChanging Blower Speed Ignitor LocationElectrical SHOCK, Fire or Explosion Hazard Ous-fanoptionThisconnectionisintendedfor.thelow speed moSeparate speed selections for Heat, Cool, FIRE, EXPLOSION, or Carbon Monoxide Poisoning HazardsHeating W Request Sequence of Operation & DiagnosticsContinuous Circulating Fan Hard-Wired Cont Request Continuous Circulating Fan G RequestOFF Control Board Diagnostic Codes See FigureHeating Request with Gas Shut Off Control BoardN8MPN075F16B1 N8MPL075F16B1 N8MPN050B12B1 N8MPL050B12B1Denotes Brand 44101261302 This Data is Subject to Change Without NoticeGeneral InputBtuh Natto LP NAHA001LP1172958 441olLimits& Controls PSC/II2 PSC/I/28MPN NatlLP NatlLP NatlLP NatlLP NatlLP NatlLP NatlLP NatlLPPSC/I/2 PSCII/2 PSCI3/4 441Ol261302 N8MPN100F14& *8MPN100F141 Denotes Brand N8MPN/L050B12& *8MPN/L050B121 DenotesBrandN8MPN/L075B12& *8MPN/L075B121 * Denotes Brand N8MPN/L075F16& *8MPN/L075F1613* DenotesBrandISMPN150J2027* DenotesBrand N8MPN/L125J222644101261302 Junction Relay Heatimhio Eutrali SwitchII,DUER%I .ICAPACITOR a Ndif\ u 16 \Nsmpn Replacement Parts N8MPN NaturalGas14B1 20B1 Replacement Parts N8MPN NaturalGasIoof Key Description Part 12B1Parts Not Illustrated 20A1 22A1N8MPL Replacement Parts N8MPL NaturalGasKey Description Part 050B 075F Nsmpl NSMPLO75B12B1NSMPLIOOF2OB1 N8MPLIOOJ2OB1 NSMPL125J22B1Parts for *8MPN/L IReplacement Parts *8MPN NaturalGas Panel Top Partnot Illustrated Key Description Parts *8MPL NaturalGas075B Replacement Parts 8MPL NaturalGas

8MPN125J20B1, N8MPL050B12B1, N8MPL100F20B1, 8MPN050B12B1, 8MPL075F16B1 specifications

Sears has long been recognized as a prominent name in the retail and home appliance industry, and its commitment to quality is evident in its range of products, including the N8MPN100F20B1, N8MPN100F14B1, 8MPL125J20B1, 8MPN100J20B1, and 8MPN075B12B1 models. These products combine advanced technology with user-friendly features to meet the demands of modern consumers.

The N8MPN100F20B1 and N8MPN100F14B1 models are equipped with innovative energy-saving technologies that help reduce electricity consumption while maintaining optimal performance. Both units feature robust insulation and efficient compressors designed for maximum cooling efficiency. They are also designed with smart controls, allowing users to customize their experience through programmable settings and remote access capabilities, ensuring comfort and convenience.

The 8MPL125J20B1 model stands out for its multipurpose functionality. This model is known for its impressive range of capabilities, making it suitable for various applications, from cooling to heating. Equipped with advanced thermal management systems, it ensures that the temperature remains consistent and comfortable, regardless of external conditions. This versatility, combined with an easy-to-use interface, makes it a favorite among households.

The 8MPN100J20B1 offers a sleek design paired with high-performance features. Its compact size makes it ideal for urban living spaces, while its quiet operation ensures minimal disruption. The model also boasts a high energy efficiency rating, aligning with modern sustainability trends. With its intuitive controls, users can easily adjust settings to match their preferences, ensuring a personalized environment.

Lastly, the 8MPN075B12B1 model is designed for those who value efficiency without sacrificing performance. This unit provides effective cooling solutions while being lightweight and easy to install. Its durable construction and reliability make it an excellent choice for both residential and commercial applications.

Overall, the Sears range of N8MPN and 8MPN models showcases the company’s focus on integrating technology with user convenience. Each unit is designed to deliver exceptional performance, energy efficiency, and versatility, making them essential additions to any home or office. With their advanced features and characteristics, these models demonstrate Sears' commitment to innovation and consumer satisfaction, reinforcing its legacy in the appliance industry.
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