Lennox International Inc EL280UH Troubleshooting Heating Sequence of Operation, On Next

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Troubleshooting: Heating Sequence of Operation

HEATING SEQUENCE OF OPERATION

NORMAL AND ABNORMAL HEATING MODE

POWER ON

CONTROL SELF−CHECK OKAY?

POLARITY OKAY?

YES

IS THERE A

PROPER GROUND?

YES

 

NO

GAS VALVE OFF. COMBUSTION AIR INDUCER OFF.

 

 

INDOOR BLOWER OFF. (RESET CONTROL BY

 

 

 

 

 

 

TURNING MAIN POWER OFF.)

 

 

 

 

 

 

 

 

 

 

 

 

NO

POLARITY REVERSED.

 

 

 

 

 

STATUS ERROR CODE 5 + 4.

 

 

 

 

 

 

 

 

 

NO

 

 

 

SIGNAL HOLDS UNTIL UNIT IS PROPERLY GROUNDED.

 

 

STATUS ERROR CODE 5 + 3.

 

 

 

 

NO

A

NORMAL OPERATION:

STATUS LED −− PULSE

B

THERMOSTAT CALLS FOR HEAT:

STATUS LED −− HEARTBEAT

YES

PRIMARY AND SECONDARY LIMIT

SWITCHES CLOSED?

YES

ROLLOUT SWITCH CLOSED?

YES

FIRST (LOW) STAGE PRESSURE SWITCH

CONTACTS OPEN?

YES

SECOND (HIGH) STAGE PRESSURE SWITCH

CONTACTS OPEN?

YES

COMBUSTION AIR INDUCER OFF.

INDOOR BLOWER ON. HAS PRIMARY OR

SECONDARY LIMIT RESET WITHIN 3 MINUTES?

STATUS ERROR CODE 3 + 1.

 

 

NO

 

NO

 

 

 

 

 

 

 

 

60−MINUTE LIMIT WATCHGUARD MODE.

 

 

GAS VALVE OFF, COMBUSTION AIR INDUCER

 

 

OFF, INDOOR BLOWER OFF WITH DELAY.

 

 

STATUS ERROR CODE 4 + 5.

 

 

 

 

 

NO

GAS VALVE OFF. COMBUSTION AIR INDUCER ON.

 

INDOOR BLOWER ON.

 

 

 

 

STATUS ERROR CODE 5 + 1.

 

 

SEQUENCE HOLDS UNTIL ROLLOUT SWITCH IS

NO

 

RESET AND MAIN POWER IS INTERRUPTED OR

T’STAT IS CYCLED OFF/ON FOR 3 SEC. MINIMUM.

 

 

 

 

 

GAS VALVE OFF. COMBUSTION AIR INDUCER OFF. INDOOR BLOWER OFF. CONTROL REMAINS UNTIL PRESSURE SWITCH IS DETECTED OPEN. STATUS ERROR CODE 2 + 4

NO

YES

NO

YES

TWO−STAGE OR SINGLE−STAGE THERMOSTAT

CALL FOR HEAT

COMBUSTION AIR INDUCER ON LOW SPEED.

1STATUS LED −− HEARTBEAT

GAS VALVE OFF.

COMBUSTION AIR INDUCER OFF.

INDOOR BLOWER OFF.

CONTROL WILL NOT ATTEMPT SECOND−STAGE

OPERATION DURING THIS HEAT DEMAND.

FIRST−STAGE OPERATION WILL BE ATTEMPTED.

STATUS ERROR CODE 2 + 6.

CONTINUED ON NEXT PAGE

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.

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Contents Installation Instructions EL280UH Table of ContentsUnit Dimensions − inches mm Supply AIR OpeningParts Arrangement Shipping and Packing List Safety InformationEL280UH Gas Furnace 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 Electrostatic Discharge ESD Interior MAKE−UP BOX InstallationElectrical 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−UpHigh Altitude Gas Pressure AdjustmentProper Combustion 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 ListLED Integrated Control Diagnostic CodesFlash Code Status / Error Description 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.

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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.