Lennox International Inc SL280DFV, DAVE LENNOX SIGNATURE COLLECTION GAS FURNACE To flame failure

Page 52

Integrated Control Diagnostic Codes (continued)

E 272

Soft lockout − Exceeded maximum number of recycles. Last recycle due

Check operation of low pressure switch to see if it is

 

to the pressure switch opening.

stuck closed on heat call. Check pressure (inches

 

 

w.c.) of high pressure switch closing on heat call.

 

 

Measure operating pressure (inches w.c.). Inspect

 

 

vent and combustion air inducer for correct opera-

 

 

tion and restriction. Clears when heat call finishes

 

 

successfully.

 

 

 

E 273

Soft lockout − Exceeded maximum number of recycles. Last recycle due

Check micro−amperes of flame sensor using control

 

to flame failure.

diagnostics or field−installed mode. Clean or replace

 

 

sensor. Measure voltage of neutral to ground to en-

 

 

sure good unit ground. Clears when heat call finish-

 

 

es successfully.

 

 

 

E 274

Soft lockout − Exceeded maximum number of recycles. Last recycle

Shut down system. 1−hour soft lockout. Check firing

 

failed due to the limit circuit opening or limit remained open longer than

rate and air flow. Check for blockage. Clears when

 

3 minutes.

heat call finishes successfully.

 

 

 

E 275

Soft lockout − Flame sensed out of sequence. Flame signal is gone.

Shut off gas. Check for gas valve leak. 1−hour soft

 

 

lockout. Clears when flame has been proven stable.

 

 

 

E 276

Watchguard calibration failure.

Unable to perform pressure switch calibration.

 

 

Check vent system and pressure switch wiring con-

 

 

nections. 1−hour soft lockout. Clears when calibra-

 

 

tion has finished successfully.

 

 

 

E 290

Ignitor circuit fault − Failed ignitor or triggering circuitry.

Measure resistance of hot surface ignitor. Replace if

 

 

open or not within specifications. 1−hour soft lock-

 

 

out. Clears when flame has been proven stable.

 

 

 

E 291

Heat air flow restricted below the minimum.

Check for dirty filter and air flow restriction. Check

 

 

blower performance. 1−hour soft lockout. Cleared

 

 

when heat call finishes successfully.

 

 

 

E 292

Indoor blower motor unable to start due to obstructed wheel, seized

Indoor blower motor unable to start (seized bear-

 

bearings.

ing, stuck wheel, etc.). Replace motor or wheel if

 

 

assembly does not operate or meet performance

 

 

standards. 1−hour soft lockout. Clears after circula-

 

 

tor successfully starts.

 

 

 

E 294

Combustion air inducer over current.

Check combustion blower bearings, wiring and

 

 

amps. Replace if does not operate or does not meet

 

 

performance standards. Clears after inducer current

 

 

is sensed to be in−range after the ignition following

 

 

the soft lockout or reset.

 

 

 

E 295

Indoor blower motor temperature is too high.

Indoor blower motor over temperature (motor

 

 

tripped on internal protector). Check motor bearings

 

 

and amps. Replace if necessary. Cleared after

 

 

blower demand is satisfied.

 

 

 

E 310

Discharge error temperature sensor failure. Only shown if shorted or

Compare outdoor sensor resistance to temperature/

 

out of range.

resistance charts in installation instructions. Re-

 

 

place sensor if necessary. Cleared in Communicat-

 

 

ing mode: 30 seconds after fault recovered. In Non−

 

 

Communicating mode: Cleared after the current

 

 

heat call is completed.

 

 

 

E 311

Heat rate reduced to match indoor blower air flow.

Warning Only. Furnace blower in cutback mode due

 

 

to restricted airflow. Reduce firing rate every 60

 

 

seconds to match available CFM. Check filter and

 

 

duct system. To clear, replace filter if needed or re-

 

 

pair/add duct. 2−stage controls will reduce firing rate

 

 

to 1st stage. Clears when heat call finishes success-

 

 

fully.

 

 

 

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Contents Installation Instructions SL280DFV Table of ContentsUnit Dimensions − inches mm TOP ViewParts Arrangement SL280DFV 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 Equipment in Confined Space ALL AIR from OutsideEquipment Confined Space ALL AIR from Outside Downflow Installation NON−COMBUSTIBLE Floor Opening SizeSetting Equipment SL280DFV UnitCooling Coil Properly Plenum Sized Floor OpeningFilters Duct System VentingTables for installations −1/2 MIN MAX 126 FAN + FAN FAN + NAT 168 Gas Piping Carbon Monoxide Poisoning HazardGas Pipe Capacity − ft3/hr m3/hr Electrical MAKE−UP BOXNon−Communicating Icomfortt Integrated Control Outdoor Unit Icomfort Touch System Wiring 120V ConnectionsApplications 24V Humidifier ConnectionsSL280 Field Wiring Applications With Conventional Thermostat OFF Single Stage Thermostat w Dual fuel capa Bilities SL280DFV Schematic Wiring Diagram Typical SL280DFV Field Wiring Diagram Integrated Control + = Data High Connection − = Data LOW Connection−10% approx OFF On−Board Links Blower Data 1400 Operating System Demand System Response Sequence VAC Room Thermostat Calls for First Stage Cooling Unit Start−Up GAS Valve Shown in on PositionGas Pressure Adjustment Proper CombustionManifold Pressure Settings High AltitudeOther Unit Adjustments Heating Sequence of OperationHeating Operation with TWO−STAGE Thermostat SECService Electrical SHOCK, Fire Or Explosion HazardSL280DFV BURNER, Combustion AIR Inducer Assembly Page Planned Service Repair Parts ListIntegrated Control Diagnostic Modes Integrated Control Diagnostic CodesEquipment is unable to communicate. Indicates Reconfigure the system. Replace control if heating Low pressure switch failed open To flame failure Limiters to protect the motor from damage caused Sor run cycle, or after power reset Program Unit Capacity/Size Mode Volt power−up of the furnace control,Troubleshooting Heating Sequence of Operation Call for FIRST−STAGE HeatCall for SECOND−STAGE Heat Call for Heat SatisfiedCall for Heat Satisfied FIRST−STAGE Heat SECOND−STAGE Heat 2ND Stage HeatTroubleshooting Cooling Sequence of Operation Call for CoolingTroubleshooting Continuous Fan Sequence of Operation Call for FAN
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DAVE LENNOX SIGNATURE COLLECTION GAS FURNACE, SL280DFV specifications

Lennox International Inc has made a significant mark in the heating, ventilation, and air conditioning (HVAC) industry, known for its commitment to innovation and energy efficiency. One of its standout products is the SL280DFV model, a high-efficiency gas furnace designed to meet the needs of modern homes.

The SL280DFV boasts an impressive Annual Fuel Utilization Efficiency (AFUE) rating of up to 80%. This rating indicates that the furnace converts 80% of the fuel it consumes into usable heat, making it a cost-effective choice for homeowners. The high efficiency not only reduces energy bills but also lessens the environmental impact by minimizing greenhouse gas emissions.

One of the key features of the SL280DFV is its two-stage gas valve operation. This technology allows the furnace to operate at two levels of heating output: low stage for milder days and high stage for extremely cold temperatures. This adaptability enhances comfort by maintaining more consistent indoor temperatures while also saving energy when full power is unnecessary.

Another innovative aspect of the SL280DFV is its variable-speed blower motor. This smart technology enables the furnace to adjust airflow based on the heating needs of a home, which promotes quiet operation and improved temperature consistency throughout living spaces.

The SL280DFV is equipped with a durable heat exchanger that is designed to withstand the rigors of daily use, contributing to the unit’s longevity. Additionally, the furnace features a smart ignition system that ensures reliable start-ups, so homeowners can depend on it through the coldest winter nights.

Safety is also a priority in the design of the SL280DFV. It includes various safety features such as a built-in flame sensor and advanced venting system, designed to avert hazardous situations and ensure optimal operation.

Furthermore, Lennox offers convenient installation and maintenance support, making the SL280DFV not only an efficient heating solution but also a practical choice for homeowners. With its blend of advanced technology, high efficiency, and reliability, the Lennox SL280DFV is an appealing option for those looking to upgrade their home’s heating system, promising comfort and peace of mind for many winters to come.
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