Lennox International Inc Elite Series Gas Furnace Upflow/Horizontal Air Discharge, EL280UH

Page 47

Troubleshooting: Heating Sequence of Operation (Continued)

 

HEATING SEQUENCE OF OPERATION

 

 

 

CONTINUED

 

 

SEE BOX A

 

 

 

 

NORMAL OPERATION.

 

 

 

 

SEE BOX B

 

 

 

 

 

THERMOSTAT CALLS FOR HEAT.

 

 

 

 

RETURN TO FIRST−STAGE HEAT MODE.

 

 

 

 

FIRST−STAGE CONTINUES UNTIL SECOND−

 

SECOND−STAGE (HIGH FIRE) HEAT

NO

STAGE PRESSURE SWITCH CAN BE PROVEN

YES

or HEAT DEMAND IS SATISFIED. A FIVE (5)

PRESSURE SWITCH CLOSED?

 

 

 

MINUTE WAIT PERIOD IS INITIATED BEFORE

 

 

 

 

 

YES

 

 

RETRY. WERE 5 ATTEMPTS MADE FOR

 

 

 

SECOND−STAGE HEAT?

 

 

 

 

 

HEAT DEMAND SATISFIED?

 

 

NO

 

 

STATUS LED −− HEARTBEAT.

 

 

 

SEE BOX C

 

 

 

 

FIRST−STAGE HEAT DEMAND SATISFIED?

 

YES

YES

 

 

 

 

 

SINGLE−STAGE THERMOSTAT MODE

TWO STAGE THERMOSTAT MODE?

 

 

 

(DIP SWITCH SET AT

 

(DIP SWITCH SET AT

 

 

 

YES

 

 

YES

 

 

 

 

 

FIRST AND SECOND STAGE HEAT

 

SECOND STAGE HEAT

GAS VALVE OFF, COMBUSTION AIR

YES

NO

DEMAND SATISFIED?

INDUCER OFF AFTER 5−SECOND

DEMAND SATISFIED SIMULTANEOUSLY.

STATUS LED −− HEARTBEAT.

LOW SPEED POST PURGE PERIOD,

 

STATUS LED −− HEARTBEAT.

 

 

 

INDOOR BLOWER OFF DELAY

 

 

 

 

 

 

INITIATED ON LOW HEAT SPEED.

 

 

 

 

YES

 

STATUS LED −− HEARTBEAT.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

GAS VALVE, COMBUSTION AIR INDUCER

 

 

 

AND INDOOR BLOWER RETURN TO FIRST−

 

 

 

 

STAGE OPERATION.

 

 

 

 

 

STATUS LED −− HEARTBEAT.

 

 

 

 

FIRST STAGE HEAT DEMAND SATISFIED?

 

 

 

 

 

YES

 

DEMAND FOR HEAT SATISFIED.

 

 

GAS VALVE OFF. COMBUSTION AIR INDUCER

 

 

OFF AFTER 5−SECOND LOW SPEED POST−

POWER ON STAND BY.

 

 

 

 

PURGE PERIOD. INDOOR BLOWER OFF.

STATUS LED −− PULSE.

 

 

 

 

DELAY INITIATED ON LOW HEAT SPEED.

 

 

 

 

 

 

 

STATUS LED −− PULSE.

 

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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 Drain Line Cooling ModeTemperature Rise Unit Operation
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Manual 7 pages 50.25 Kb

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.