Lennox International Inc Expert Guide on Proper Combustion and High Altitude Operation for Lennox Furnaces
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Proper Combustion

High Altitude Information

Furnace should operate minimum 15 minutes with correct manifold pressure and gas flow rate before checking com­ bustion. Take combustion sample beyond the flue outlet and compare to the tables below.

TABLE 16

EL296

CO2% For Nat

CO2% For L.P

Model

Low Fire High Fire

Low Fire High Fire

0455.4 - 6.4 7.5 - 8.5 6.4 - 7.4 8.8 - 9.8

0705.3 - 6.3 7.4 - 8.4 6.3 - 7.3 8.7 - 9.7

0905.8 - 6.8 7.6 - 8.6 6.8 - 7.8 8.9 - 9.9

110

6.1 - 7.1

8.0 - 9.0

7.1 - 8.1

9.3 - 10.3

 

 

 

 

 

135

6.1 - 7.1

7.8 - 8.8

7.1 - 8.2

9.1 - 10.1

The maximum carbon monoxide reading should not exceed 50 ppm.

NOTE - In Canada, certification for installations at eleva­ tions over 4500 feet (1372 m) is the jurisdiction of local au­ thorities.

Units may be installed at altitudes up to 10,000 ft. above sea level without manifold adjustment. Units installed at al­ titude of 4501 - 10,000 feet (1373 to 3048m) may require a pressure switch change which can be ordered separately. Table 18 lists conversion kit and pressure switch require­ ments at varying altitudes.

The combustion air pressure switch is factory-set and re­ quires no adjustment.

TABLE 17

Manifold and Supply Line Pressure 0-10,000ft.

EL296

 

Manifold Pressure in.wg.

Supply Line Pressure in. w.g.

Gas

 

 

 

 

Unit

 

 

 

 

Low Fire

High Fire

Min

Max

 

 

 

 

 

 

 

 

 

 

Natural

1.7

3.5

4.5

10.5

All Sizes

 

 

 

 

 

LP/propane

4.9

10.0

11.0

13.0

 

 

 

 

 

 

 

NOTE - A natural to L.P. propane gas changeover kit is necessary to convert this unit. Refer to the changeover kit installation instruction for the conversion procedure.

TABLE 18

LP/Propane Conversion Kit and Pressure Switch Requirements at Varying Altitudes

 

Natural to

High Altitude

High Altitude

 

 

 

Natural Burner

LP/Propane Burner

High Altitude Pressure Switch

EL296

LP/Propane

Orifice Kit

Orifice Kit

 

 

 

 

 

Unit

 

 

 

 

 

0 - 7500 ft

7501 - 10,000 ft

7501 - 10,000 ft

4501 - 7500 ft

7501 -10,000 ft

 

 

(0 - 2286m)

(2286 - 3038m)

(2286 - 3038m)

(1373 - 2286m)

(2286 - 3048m)

 

 

 

 

 

 

-045

 

 

 

93W81

93W84

 

 

 

 

 

 

-070

 

 

 

93W80

93W85

 

 

 

 

 

 

-090

*78W93

73W37

*78W96

93W82

93W80

 

 

 

 

 

 

-110

 

 

 

93W80

93W85

 

 

 

 

 

 

-135

 

 

 

93W83

93W85

 

 

 

 

 

 

* Conversion requires installation of a gas valve manifold spring which is provided with the gas conversion kit.

Pressure switch is factory set. No adjustment necessary. All models use the factory-installed pressure switch from 0-4500 feet (0-1370 m).

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Contents Table of Contents Installation Instructions EL296UHETOP View EL296UHE Unit Dimensions inches mmPackage 1 of 1 contains Safety InformationEL296UHE Gas Furnace Shipping and Packing ListInstallation Locations Installed in Combination with a Cooling CoilUse of Furnace as Construction Heater Combustion, Dilution & Ventilation Air GeneralEquipment in Confined Space ALL AIR from Inside Confined SpaceAir from Inside Unconfined SpaceAir from Outside Equipment in Confined Space ALL AIR from OutsideEquipment in Confined Space EL296 Furnaces with 1/2 HP Blower Motor Installation Setting EquipmentShipping Bolt Removal Moved before the furnace is placed into operation. Af­END View Setting EquipmentFront View Side ViewSide Return Air With transition and filter Return Air GuidelinesOptional Return Air Base Upflow Applications Only Removing the Bottom PanelFrontBack Horizontal Suspension KIT Horizontal Application Installation ClearancesSuspended Installation of Horizontal Unit Platform Installation of Horizontal UnitPipe & Fittings Specifications FiltersDuct System Primer & Solvent Cement Joint Cementing ProcedurePiping and Fittings Specifications SpecificationRemoval of the Furnace from Common Vent Venting PracticesPiping Suspension Guidelines Wall Thickness GuidelinesMinimum Vent Pipe Lengths Horizontal Installation Offset RequirementsVent Piping Guidelines Exhaust Piping Figures 22, 24Piping Size Process Standard Concentric Outdoor Termination Usage135 Standard Termination Elevation 4500 10,000 ftMaximum Allowable Intake or Exhaust Vent Length in Feet Concentric Termination at Elevation 0 4500 ftConcentric Termination Elevation 4501 10,000 ft Standard Termination Elevation 4500 10,000 ft Applications Right Hand Discharge Shown Intake Piping General Guidelines for Vent Terminations 32 to 20 to Inside Corner Detail US Installations1 Canadian Installations2No minimum to outside corner Exiting Exhaust and Intake Vent Different pressure zones Direct Vent Roof Termination KITEL296UHE 51MM 76MM Alternate Terminations Tee & Forty-Five Degree Elbows OnlySupport 51MM 7MM Vent PipeSide View Front ViewTop View Exhaust NON-DIRECT Vent Roof Termination KIT EL296UHE Direct Vent Application Using Existing ChimneyCondensate Piping EL296UHE NON-DIRECT Vent Application Using Existing ChimneyCondensate Trap Locations Condensate Trap With Optional Overflow SwitchUnit shown in horizontal left-hand discharge position EL296UHE with Evaporator Coil Using a Common Drain178 Trap / Drain Assembly Using 1/2 PVC or 3/4 PVCGas Piping Leak CheckPlugged TAP Left Side Piping Standard Right Side Piping Alternate Horizontal Applications Possible Gas Piping ConfigurationsGAS Pipe Capacity FT3/HR kL/HR Precautions and ProceduresInterior MAKE-UP BOX Installation ElectricalOn-Board Links and Diagnostic Push Button Figure Typical EL296UHE Wiring Diagram LED Integrated ControlIntegrated Control DIP Switch Settings EL296 Field Wiring Applications With Conventional Thermostat Heat / 1 Cool OFFWith tstat with Humidity control7000 L7724U Single StageHeat Pump ComfortSenseOFF Unit Start-Up For Your Safety Read Before OperatingGas Pressure Adjustment GAS Meter Clocking ChartDial Proper Combustion High Altitude Information Carbon Monoxide Poisoning Hazard Heating Sequence of Operation Other Unit AdjustmentsBlower Parts Repair Parts ListCabinet Parts Control Panel PartsFilters ServiceCleaning The Burner Assembly BlowerTypical Start-Up & Performance Check ListVent Pipe Temperature RiseTotal External Static Drain Line Condensate Line ThermostatApproved Carbon Monoxide Detectors Requirements for Commonwealth of Massachusetts

EL296UHE, Elite Series Gas Furnace specifications

Lennox International Inc. has long been a trusted name in the heating, ventilation, and air conditioning (HVAC) industry, and their Elite Series Gas Furnace, the EL296UHE, stands out as a remarkable choice for homeowners seeking efficiency and reliability. This gas furnace is designed to deliver exceptional performance while ensuring the comfort of your living space.

One of the most significant features of the EL296UHE is its impressive Annual Fuel Utilization Efficiency (AFUE) rating of up to 96%. This means that a substantial portion of the energy consumed is converted into heat, translating to lower energy bills and a reduced environmental footprint. By minimizing energy waste, homeowners can enjoy both cost savings and greater environmental responsibility.

The EL296UHE is equipped with a two-stage heating process that allows it to operate at different speeds. This dual-stage functionality offers a more consistent temperature throughout the home, minimizing cold spots and enhancing overall comfort. Additionally, this furnace features a variable-speed blower motor, which not only improves the distribution of heated air but also quietly adjusts the airflow to match the heating requirements of your space.

In terms of technology, the EL296UHE incorporates advanced design elements such as a patented ZenBalance™ technology. This innovation further increases efficiency by adjusting the heating output based on real-time demands, ensuring optimal comfort without excessive energy consumption.

Durability is another hallmark of the EL296UHE. Constructed with high-quality materials, this furnace is built to withstand the rigors of daily use. Its stainless-steel heat exchanger is particularly noteworthy, as it enhances the furnace's ability to operate efficiently while maximizing longevity.

Homeowners are also reassured by the EL296UHE's quiet operation. The design minimizes operational noise, making it an ideal choice for those who prefer a peaceful home environment. Furthermore, the furnace is equipped with an ENERGY STAR® certification, a testament to its energy-efficient performance.

Lastly, Lennox offers comprehensive warranties for the EL296UHE, ensuring peace of mind for consumers. The combination of high efficiency, advanced technology, and durability makes the Lennox Elite Series Gas Furnace, EL296UHE, an excellent investment for homeowners looking to enhance their heating systems for optimal comfort and efficiency.
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