Lennox International Inc Comprehensive Guide to Maintaining Your Lennox EL280UH Gas Furnace
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9 − Remove screws from both sides, top and bottom of vestibule panel.

10 −Remove heat exchanger. It may be necessary to spread cabinet side to allow more room. If so, remove five screws from the left side or right side of cabinet. See figure 38.

11 − Backwash using steam. Begin from the burner opening on each clam. Steam must not exceed 275°F.

12−To clean burners, run a vacuum cleaner with a soft brush attachment over the face of burners. Visually inspect in- side the burners and crossovers for any blockage caused by foreign matter. Remove any blockage. Figure 36 shows burner detail.

13−To clean the combustion air inducer visually inspect and using a wire brush clean where necessary. Use com- pressed air to clean off debris and any rust.

14−Reinstall heat exchanger in vestibule. (Replace the five screws in the cabinet from step 10 if removed).

15−NOx units only − Replace NOx inserts.

16−Reinstall collector box and combustion air assembly. Reinstall all screws to the collector box and combustion air inducer. Failure to replace all screws may cause leaks. Inspect gaskets for any damage and replace if necessary.

17−Reinstall burner box, manifold assembly and burner box cover.

EL280UH NOx INSERTS

NOx Insert

FIGURE 37

Remove 5 screws if necessary

(either side of cabinet)

1

2

3

4

5

FIGURE 38

18−Reconnect all wires.

19−Reconnect top cap and vent pipe to combustion air in- ducer outlet.

20−Reconnect gas supply piping.

21−Turn on power and gas supply to unit.

22−Set thermostat and check for proper operation.

23−Check all piping connections, factory and field, for gas leaks. Use a leak detecting solution or other preferred means.

CAUTION

Some soaps used for leak detection are corrosive to certain metals. Carefully rinse piping thoroughly af- ter leak test has been completed. Do not use matches, candles, flame or other sources of ignition to check for gas leaks.

24 −If a leak is detected, shut gas and electricity off and repair leak.

25 −Repeat steps 24 and 26 until no leaks are detected.

26 −Replace access panel.

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Contents Table of Contents Installation Instructions EL280UHSupply AIR Opening Unit Dimensions − inches mmParts Arrangement Shipping and Packing List Safety InformationEL280UH Gas Furnace General Use of Furnace as Construction HeaterCombustion, Dilution & Ventilation Air Equipment in Confined Space ALL AIR from Inside Equipment in Confined Space Setting Equipment Return Air Bracket Duct System FiltersUpflow Position VentingHorizontal Right Position Horizontal Left PositionVent Connection Upflow and Horizontal Position Common Venting Using Metal−Lined Masonry Chimney −1/2 To these instructions and the provided venting tables. If Feet FAN + FAN FAN + NAT 130 Carbon Monoxide Poisoning Hazard Leum gases Gas PipingHorizontal Applications Possible Gas Piping Configurations Electrostatic Discharge ESD Interior MAKE−UP BOX InstallationElectrical Page Field Wiring Applications OFF EL280UH Schematic Wiring Diagram TWO−STAGE Integrated Control Typical EL280UH Field Wiring DiagramIntegrated Control Unit Start−Up For Your Safety Read Before LightingHigh Altitude Gas Pressure AdjustmentProper Combustion Manifold Pressure Settings at all Altitudes Heat FAN-OFF Time in Seconds Other Unit AdjustmentsHeating Sequence of Operation Blower Data Pressure Bottom and One Side Electrical SHOCK, Fire Or Explosion Hazard ServiceHeat Exchanger Removal EL280UH BURNER, Combustion AIR Inducer AssemblyPage Repair Parts List Planned ServiceLED Integrated Control Diagnostic CodesFlash Code Status / Error Description On Next Troubleshooting Heating Sequence of OperationHeating Sequence of Operation U1.40 microamps Or Heat Demand is SATISFIED. a Five Cooling Sequence of Operation Troubleshooting Cooling Sequence of OperationContinuous LOW Speed FAN Sequence of Operation Troubleshooting Continuous Fan Sequence of OperationStart−Up & Performance Check List Temperature Rise Cooling ModeUnit Operation Drain Line
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Elite Series Gas Furnace Upflow/Horizontal Air Discharge, EL280UH specifications

Lennox International Inc. has established itself as a leader in the heating and cooling industry, providing innovative solutions for both residential and commercial environments. One of their notable products is the EL280UH, a high-efficiency gas furnace designed to offer optimal comfort while minimizing energy consumption.

The EL280UH operates with an impressive Annual Fuel Utilization Efficiency (AFUE) rating of up to 80%. This efficiency rating means that 80% of the fuel consumed is converted into heat, making it a cost-effective option for homeowners looking to reduce their utility bills. The furnace’s design is tailored to deliver reliable warmth during the coldest months, ensuring a comfortable home environment.

A key feature of the EL280UH is its two-stage heating capability. This technology allows the furnace to operate at a lower heating output for less demanding conditions, which not only conserves energy but also helps maintain a more consistent temperature in the home. When the demand for heat increases, the furnace can seamlessly transition to its higher output setting, providing quick and effective heating when needed.

Additionally, the EL280UH is equipped with a durable cabinet that minimizes heat loss, enhancing overall performance. The design incorporates several sound-dampening features as well, which contributes to quieter operation, allowing homeowners to enjoy a serene indoor environment.

The furnace also includes an advanced control system that integrates easily with smart home technology. This feature enables users to monitor and adjust their heating settings from anywhere using a smartphone app, creating added convenience and control over home heating.

Safety is another paramount aspect of the EL280UH. It includes an integrated flame sensor and pressure switch, ensuring reliable operation while minimizing risks associated with furnace malfunctions. The design adheres to stringent safety standards, providing users with peace of mind.

In summary, the Lennox EL280UH furnace stands out for its high efficiency, advanced features, and commitment to user safety. Its two-stage heating capability, quiet operation, and smart home integration make it an excellent choice for homeowners looking to enhance their heating system while being energy-conscious. The EL280UH embodies Lennox's dedication to quality and innovation, ensuring that comfort and efficiency go hand in hand.
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