Lennox International Inc Comprehensive Maintenance Instructions for EL280UH Gas Furnace
Page 40

Cleaning the Heat Exchanger and Burners

NOTE − Use papers or protective covering in front of the fur- nace during cleaning.

1 − Turn off both electrical and gas power supplies to fur- nace.

2 − Remove flue pipe and top cap (some applications top cap can remain) from the unit.

3 − Label the wires from gas valve, rollout switches, prima- ry limit switch and make−up box then disconnect them.

4 − Remove the screws that secure the combustion air in- ducer/pressure switch assembly to the collector box. Carefully remove the combustion air inducer to avoid damaging blower gasket. If gasket is damaged, it must be replaced to prevent leakage.

5 − Remove the collector box located behind the combus- tion air inducer. Be careful with the collector box gas- ket. If the gasket is damaged, it must be replaced to prevent leakage.

6 − Disconnect gas supply piping. Remove the screw se- curing the burner box cover and remove cover. Re- move the four screws securing the burner manifold as- sembly to the vestibule panel and remove the assembly from the unit.

7 − Remove screws securing burner box and remove burner box.

8 − NOX units only − Remove screw securing NOX insert. Remove NOX insert. See figure 37.

 

EL280UH BURNER, COMBUSTION AIR INDUCER ASSEMBLY &

 

HEAT EXCHANGER REMOVAL

 

 

gasket

 

 

pressure switch

 

 

flue transition

 

 

collector box

Heat Exchanger

Rollout Switches

Ignitor

 

(location)

orifice plate

 

 

combustion air inducer

 

Sensor

 

 

 

 

Retention Rings

 

 

Cross Over

 

Manifold And Gas Valve

 

FIGURE 36

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Contents Installation Instructions EL280UH Table of ContentsUnit Dimensions − inches mm Supply AIR OpeningParts Arrangement EL280UH Gas Furnace Safety InformationShipping and Packing List Use of Furnace as Construction Heater GeneralCombustion, Dilution & Ventilation Air Equipment in Confined Space ALL AIR from Inside Equipment in Confined Space Setting Equipment Return Air Bracket Filters Duct SystemVenting Upflow PositionHorizontal Left Position Horizontal Right 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 Gas Piping Leum gasesHorizontal Applications Possible Gas Piping Configurations Electrical Interior MAKE−UP BOX InstallationElectrostatic Discharge ESD Page Field Wiring Applications OFF EL280UH Schematic Wiring Diagram Typical EL280UH Field Wiring Diagram TWO−STAGE Integrated ControlIntegrated Control For Your Safety Read Before Lighting Unit Start−UpProper Combustion Gas Pressure AdjustmentHigh Altitude Manifold Pressure Settings at all Altitudes Other Unit Adjustments Heat FAN-OFF Time in SecondsHeating Sequence of Operation Blower Data Pressure Bottom and One Side Service Electrical SHOCK, Fire Or Explosion HazardEL280UH BURNER, Combustion AIR Inducer Assembly Heat Exchanger RemovalPage Planned Service Repair Parts ListFlash Code Status / Error Description Integrated Control Diagnostic CodesLED Troubleshooting Heating Sequence of Operation On NextHeating Sequence of Operation U1.40 microamps Or Heat Demand is SATISFIED. a Five Troubleshooting Cooling Sequence of Operation Cooling Sequence of OperationTroubleshooting Continuous Fan Sequence of Operation Continuous LOW Speed FAN Sequence of OperationStart−Up & Performance Check List Cooling Mode Temperature RiseUnit 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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