Lennox International Inc Essential Lennox Furnace Repair Parts for Efficient Heating Solutions
Page 54

Applications Using A Single-Stage Thermostat B - Heating Sequence -- Integrated Control Thermostat Selection DIP Switch 1 ON in “Single-Stage” Position

NOTE - In these applications, two-stage heat will be initi­ ated by the integrated control if heating demand has not been satisfied after the field adjustable period (7 or 12 min­ utes).

1 - On a call for heat, thermostat first-stage contacts close sending a signal to the integrated control. The inte­ grated control runs a self‐diagnostic program and checks high temperature limit switches for normally closed contacts and pressure switches for normally open contacts. The combustion air inducer is ener­ gized at low speed.

2 - Once the control receives a signal that the low pres­ sure switch has closed, the combustion air inducer be­ gins a 15-second pre-purge in low speed.

NOTE - If the low fire pressure switch does not close the combustion air inducer will switch to high fire. After a 15 second pre-purge the high fire pressure switch will close and the unit will begin operation on high fire. After 10 to 20 seconds of high fire operation the unit will switch to low fire.

3 - After the pre-purge is complete, a 20-second initial ig­ nitor warm-up period begins. The combustion air in­ ducer continues to operate at low speed.

4 - After the 20-second warm-up period has ended, the gas valve is energized on low fire (first stage) and ignition oc­ curs. At the same time, the control module sends a sig­ nal to begin an indoor blower 30-second ON-delay. When the delay ends, the indoor blower motor is ener­ gized on the low fire heating speed and the HUM con­ tacts are energized. The integrated control also initi­ ates a second-stage on delay (factory-set at 7 minutes; adjustable to 12 minutes).

5 - If the heating demand continues beyond the second- stage on delay, the integrated control energizes the combustion air inducer at high speed. The control also checks the high fire (second stage) pressure switch to make sure it is closed. The high fire (second stage) gas valve is energized and the indoor blower motor is energized for operation at the high fire heating speed.

6 - When the thermostat heating demand is satisfied, the combustion air inducer begins a 5-second low speed post-purge. The field-selected indoor blower off delay begins. The indoor blower operates at the low-fire heating speed.

7 - When the combustion air post-purge period is com­ plete, the inducer, the HUM contacts as well as the 120V ACC terminals are de-energized. The indoor blower is de-energized at the end of the off delay.

Repair Parts List

The following repair parts are available through Lennox dealers. When ordering parts, include the complete fur­ nace model number listed on the CSA nameplate -- Exam­ ple: EL296UH045XE24B-01. All service must be per­ formed by a licensed professional installer (or equivalent), service agency, or gas supplier.

Cabinet Parts

Outer access panel

Blower access panel

Top Cap

Control Panel Parts

Transformer

Integrated control board

Door interlock switch

Blower Parts

Blower wheel

Motor

Motor mounting frame

Motor capacitor

Blower housing cutoff plate

Heating Parts

Flame Sensor

Heat exchanger assembly

Gas manifold

Combustion air inducer

Gas valve

Main burner cluster

Main burner orifices

Pressure switch

Ignitor

Primary limit control

Flame rollout switches

Page 54

Page 53 Page 55
Image 54
Page 53 Page 55
Contents Installation Instructions EL296UHE Table of ContentsEL296UHE Unit Dimensions inches mm TOP ViewShipping and Packing List Safety InformationEL296UHE Gas Furnace Package 1 of 1 containsInstallation Locations Installed in Combination with a Cooling CoilUse of Furnace as Construction Heater General Combustion, Dilution & Ventilation AirUnconfined Space Confined SpaceAir from Inside Equipment in Confined Space ALL AIR from InsideAir from Outside Equipment in Confined Space ALL AIR from OutsideEquipment in Confined Space Moved before the furnace is placed into operation. Af­ Installation Setting EquipmentShipping Bolt Removal EL296 Furnaces with 1/2 HP Blower MotorSide View Setting EquipmentFront View END ViewReturn Air Guidelines Side Return Air With transition and filterOptional Return Air Base Upflow Applications Only Removing the Bottom PanelFrontBack Platform Installation of Horizontal Unit Horizontal Application Installation ClearancesSuspended Installation of Horizontal Unit Horizontal Suspension KITPipe & Fittings Specifications FiltersDuct System Specification Joint Cementing ProcedurePiping and Fittings Specifications Primer & Solvent CementWall Thickness Guidelines Venting PracticesPiping Suspension Guidelines Removal of the Furnace from Common VentExhaust Piping Figures 22, 24 Horizontal Installation Offset RequirementsVent Piping Guidelines Minimum Vent Pipe LengthsPiping Size Process Outdoor Termination Usage Standard ConcentricStandard Termination Elevation 4500 10,000 ft 135Maximum 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 US Installations1 Canadian Installations2 Inside Corner DetailNo minimum to outside corner Exiting Exhaust and Intake Vent Different pressure zones Direct Vent Roof Termination KITEL296UHE Alternate Terminations Tee & Forty-Five Degree Elbows Only 51MM 76MM51MM 7MM Vent Pipe SupportSide View Front ViewTop View Exhaust EL296UHE Direct Vent Application Using Existing Chimney NON-DIRECT Vent Roof Termination KITEL296UHE NON-DIRECT Vent Application Using Existing Chimney Condensate PipingCondensate Trap With Optional Overflow Switch Condensate Trap LocationsEL296UHE with Evaporator Coil Using a Common Drain Unit shown in horizontal left-hand discharge positionTrap / Drain Assembly Using 1/2 PVC or 3/4 PVC 178Gas Piping Leak CheckPlugged TAP Horizontal Applications Possible Gas Piping Configurations Left Side Piping Standard Right Side Piping AlternateElectrical Precautions and ProceduresInterior MAKE-UP BOX Installation GAS Pipe Capacity FT3/HR kL/HROn-Board Links and Diagnostic Push Button Figure Typical EL296UHE Wiring Diagram Integrated Control LEDIntegrated Control DIP Switch Settings EL296 Field Wiring Applications With Conventional Thermostat Humidity control OFFWith tstat with Heat / 1 CoolComfortSense Single StageHeat Pump 7000 L7724UOFF For Your Safety Read Before Operating Unit Start-UpGas Pressure Adjustment GAS Meter Clocking ChartDial Proper Combustion High Altitude Information Carbon Monoxide Poisoning Hazard Other Unit Adjustments Heating Sequence of OperationControl Panel Parts Repair Parts ListCabinet Parts Blower PartsBlower ServiceCleaning The Burner Assembly FiltersStart-Up & Performance Check List TypicalCondensate Line Thermostat Temperature RiseTotal External Static Drain Line Vent PipeRequirements for Commonwealth of Massachusetts Approved Carbon Monoxide Detectors

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.
Top Page Image Contents