Lennox International Inc Troubleshooting Heating Operations in Lennox Upflow Furnace Systems

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Troubleshooting: Heating Sequence of Operation (Continued)

HEATING SEQUENCE OF OPERATION

CONTINUED

THERMOSTAT CALLS FOR HEAT

STATUS LED − HEARTBEAT.

(Refer to box A on previous page)

1FIRST−STAGE (LOW FIRE) PRESSURE SWITCH CLOSED WITHIN 2.0 MINUTES?

YES

 

 

15−SECOND COMBUSTION AIR INDUCER

 

PRE−PURGE INITIATED BY CLOSED FIRST−STAGE

 

 

PRESSURE SWITCH (or 15 SECOND

1

INTER−PURGE PERIOD.)

STATUS LED −− HEARTBEAT.

 

 

 

 

 

 

 

 

 

 

 

IGNITOR WARM−UP (20 SECONDS)

 

 

STATUS LED −− HEARTBEAT.

 

 

YES

 

 

 

 

 

 

 

 

 

 

 

 

 

IS IGNITOR INTACT AND CONNECTED?

 

 

YES

 

 

 

 

 

NO

NO

GAS VALVE OFF. COMBUSTION AIR INDUCER OFF. INDOOR BLOWER OFF. UNIT WILL RETRY AFTER 5−MINUTE WAIT PERIOD.

STATUS ERROR CODE 2 + 3.

COMBUSTION AIR INDUCER

 

LOW AND HIGH

NO

 

PRESSURE SWITCH

 

 

ENERGIZED ON HIGH SPEED

 

 

 

 

CLOSED WITHIN 30

 

 

 

 

YES

 

 

SECONDS

 

 

 

 

 

 

 

 

 

COMBUSTION AIR INDUCER OFF, IGNITOR OFF. SIGNAL HOLDS UNTIL IGNITOR IS REPLACED OR RECONNECTED.

STATUS ERROR CODE 4 + 7.

2AT END OF IGNITOR 20 SECOND WARM UP PERIOD, 4−SECOND TRIAL FOR IGNITION.

GAS VALVE OPENS, IGNITOR ENERGIZED DURING

4−SECOND TRIAL UNTIL FLAME SENSED.

YES

4−SECOND FLAME STABILIZATION PERIOD.

NO

YES

IS VOLTAGE ABOVE 90 VOLTS?

NO

COMBUSTION AIR INDUCER OFF, IGNITOR OFF. SIGNAL HOLDS UNTIL VOLTAGE RISES ABOVE 95 VOLTS. STATUS ERROR CODE 4 + 8.

FLAME RECTIFICATION CURRENT CHECK

CAN FLAME BE PROVEN WITHIN 4

SECONDS AFTER GAS VALVE OPENS?

(u0.20 microamps)

GAS VALVE OFF. COMBUSTION AIR INDUCER ON. INDOOR BLOWER OFF.

STATUS LED −− HEARTBEAT.

HAS CONTROL FAILED TO SENSE

FLAME FOR FIVE CONSECUTIVE TRIES

DURING A SINGLE HEAT DEMAND?

YES

NO

FLAME PRESENT?

YES

CONTINUED ON NEXT PAGE

NO

WATCHGUARD MODE. GAS VALVE OFF,

COMBUSTION AIR INDUCER OFF.

INDOOR BLOWER OFF.

STATUS ERROR CODE 4 + 1.

IS 60−MINUTE RESET PERIOD COMPLETE?

YES

HAS CONTROL RESET IGNITION SEQUENCE

FOUR (4) TIMES?

WATCHGUARD MODE.

STATUS ERROR CODE 4 + 3.

YES

NO

1If the furnace is operating on continuous fan mode (terminals

air inducer will energize on high speed, the gas valve will energize on second−stage heat and the furnace

will operate on high fire. Furnace will stay on high fire 60 seconds then switch to low fire.

2If combustion air inducer is operating on high speed and gas valve is energized on second− stage heat, 20 seconds after flame is sensed furnace will switch to low fire.

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Contents Table of Contents Installation Instructions EL280UHSupply AIR Opening Unit Dimensions − inches mmParts Arrangement Safety Information EL280UH Gas FurnaceShipping and Packing List 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 Interior MAKE−UP BOX Installation ElectricalElectrostatic Discharge ESD 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 LightingGas Pressure Adjustment Proper CombustionHigh Altitude 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 ServiceIntegrated Control Diagnostic Codes Flash Code Status / Error DescriptionLED 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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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.

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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.