Lennox International Inc Elite Series Gas Furnace Upflow/Horizontal Air Discharge General

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Installed in Combination with a Cooling Coil

When this furnace is used with cooling units, it shall be installed in parallel with, or on the upstream side of, cooling units to avoid condensation in the heating compartment. See figure 2. With a parallel flow arrangement, a damper (or other means to control the flow of air) must adequately pre- vent chilled air from entering the furnace. If the damper is manually operated, it must be equipped to prevent operation of either the heating or the cooling unit, unless it is in the full HEAT or COOL setting. See figure 2.

Heating Unit Installed Parallel to Cooling Coil

Dampers

(open during heating operation only)

Gas Unit

Cooling Coil

Dampers

(open during cooling operation only)

Heating Unit Installed Upstream of Cooling Unit

Gas Unit

Cooling Coil

FIGURE 2

When installed, this furnace must be electrically grounded according to local codes. In addition, in the United States, installation must conform with the current National Elec- tric Code, ANSI/NFPA No. 70. The National Electric Code (ANSI/NFPA No. 70) is available from the following ad- dress:

National Fire Protection Association

1 Battery March Park

Quincy, MA 02269

NOTE − This furnace is designed for a minimum continu- ous return air temperature of 60°F (16°C) or an intermit- tent operation down to 55°F (13°C) dry bulb for cases where a night setback thermostat is used. Return air tem- perature must not exceed 85°F (29°C) dry bulb.

The EL280UH furnace may be installed in alcoves, closets, attics, basements, garages, crawl spaces and utility rooms in the upflow or horizontal position.

This furnace design has not been CSA International certified for installation in mobile homes, recreational vehicles, or outdoors.

Use of Furnace as Construction Heater

Lennox does not recommend the use of EL280UH units as a construction heater during any phase of construction. Very low return air temperatures, harmful vapors and op- eration of the unit with clogged or misplaced filters will dam- age the unit.

EL280UH units may be used for heating of buildings or structures under construction, if the following conditions are met:

D The vent system must be permanently installed per these installation instructions.

DA room thermostat must control the furnace. The use of fixed jumpers that will provide continuous heating is not allowed.

DThe return air duct must be provided and sealed to the furnace.

DReturn air temperature range between 60°F (16°C) and 80°F (27°C) must be maintained.

DAir filters must be installed in the system and must be maintained during construction.

DAir filters must be replaced upon construction comple- tion.

DThe input rate and temperature rise must be set per the furnace rating plate.

DOne hundred percent (100%) outdoor air must be pro- vided for combustion air requirements during construc- tion. Temporary ducting may supply outdoor air to the furnace. Do not connect duct directly to the furnace. Size the temporary duct following these instructions in section for Combustion, Dilution and Ventilation Air in a confined space with air from outside.

DThe furnace heat exchanger, components, duct system, air filters and evaporator coils must be thoroughly cleaned following final construction clean−up.

DAll furnace operating conditions (including ignition, in- put rate, temperature rise and venting) must be verified according to these installation instructions.

General

These instructions are intended as a general guide and do not supersede local codes in any way. Consult authorities having jurisdiction before installation.

In addition to the requirements outlined previously, the fol- lowing general recommendations must be considered when installing a EL280UH furnace:

DPlace the furnace as close to the center of the air dis- tribution system as possible. The furnace should also be located close to the chimney or vent termination point.

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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.