Manuals / Lennox International Inc / Household Appliance / Furnace

Lennox International Inc SL280UH090V48B Troubleshooting Continuous Fan Sequence of Operation

Models: SL280UH090V36B SL280UH070V36A DAVE LENNOX SIGNATURE COLLECTION GAS FURNACE UPFLOW / HORIZONTAL AIR DISCHARGE SL280UH090V48B

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Troubleshooting: Continuous Fan Sequence of Operation

CALL FOR FAN

1

CALL FOR FAN

INDOOR BLOWER ON

CONTINUOUS FAN

SPEED

CALL FOR FAN	NO	MAINTAIN INDOOR
REMOVED?		BLOWER AT
		CONTINUOUS FAN

YES

REQUEST YES FOR COOLING

RECEIVED?

NO

REQUEST YES FOR HEAT RECEIVED?

NO

DE−ENERGIZE INDOOR

BLOWER

MAINTAIN INDOOR

BLOWER AT

CONTINUOUS FAN

INDOOR BLOWER OFF

4GO TO CALL FOR COOLING

1GO TO CALL FOR 1ST STAGE HEAT

1

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Lennox International Inc SL280UH090V48B, SL280UH070V36A Troubleshooting Continuous Fan Sequence of Operation, Call for FAN

Contents

Installation Instructions SL280UHV Table of Contents Unit Dimensions − inches mm Return air from both sidesSide Return Air Opening Either Side Access Panel Blower Assembly Parts ArrangementSight Glass Safety Information SL280UHV Gas FurnaceShipping and Packing List Use of Furnace as Construction Heater GeneralAir Handler Unit Evaporator Combustion, Dilution & Ventilation Air Equipment in Confined Space ALL AIR from Inside Equipment in Confined Space ALL AIR from Outside Equipment in Confined SpaceEquipment Confined Space ALL AIR from Outside Setting Equipment BottomBlower Motor Rigid LEG 20 X 25 X Furnace FrontIndoor AIR Return AIR Base Horizontal Application Installation Clearances Top Left RightEnd Bottom Typical Horizontal Application Filters Duct System Venting Upflow PositionTop Vent Discharge Left Side Vent Discharge Horizontal Left Position Horizontal Right PositionSide Vent Discharge Common Venting Using Metal−Lined Masonry Chimney Disconnected VentSticker Vent Pipe Vent Connector Through an unused masonry chimney flue is not considered 102 127 −1/2 152 178 10−1/2 MIN MAX Feet FAN + FAN FAN + NAT 130 Carbon Monoxide Poisoning Hazard Ers or straps. Install a drip leg in vertical pipe runs to − In some localities, codes may require the installationGas Piping Every 8 to 10 feet 2.44 to 3.01 m with suitable hang Horizontal Application Left−Side Air DischargeRight−Side Air Discharge Interior MAKE−UP BOX Installation ElectricalElectrostatic Discharge ESD BOX Non−Communicating Communicating Icomfortt Integrated Control Outdoor Unit Icomfort Touch NON−COMMUNICATING System Wiring Communicating System Wiring120V Connections Applications DIP Switch Settings and On−Board Links See figure OFF Single Stage Thermostat w Dual fuel capa Bilities SL280UHV Schematic Wiring Diagram Typical SL280UHV Field Wiring Diagram Integrated Control RS−BUS Link TB82, future use+ = Data High Connection − = Data LOW Connection −10% approx OFF On−Board Links 1045 985940 880 SL280UH090V36B Blower Performance less filter 1280 12201155 1095 1295 12351170 1110 1360 12301165 1100 1290 12251160 1380 +18% 1605 SL280UH110V60C Blower Performance less filter +18% 1785 SL280UH135V60D Blower Performance less filter Operating Sequence Compressor Thermostat energizes Y2 For Your Safety Read Before Lighting Unit Start−UpWhite Rodgers GAS Valve Honeywell GAS Valve Gas Pressure Adjustment GAS Meter Clocking ChartProper Combustion Dial High Altitude Other Unit Adjustments Heating Sequence of Operation Heating Operation with TWO−STAGE Thermostat Heating Operation with Single Stage ThermostatSEC Service Electrical SHOCK, Fire Or Explosion Hazard SL280UHV BURNER, Combustion AIR Inducer Assembly 13− To clean the combustion air inducer visually inspect11− Back wash using steam. Begin from the burner opening 17− Reinstall burner box, manifold assembly and burner box SL280UHV NOX Inserts Planned Service Repair Parts List Integrated Control Diagnostic Modes Integrated Control Diagnostic Codes Normal operation 5 seconds after fault recovered Furnace / air handler. Clears after fault recoveredPower at the thermostat. Alert stops all services Equipment is unable to communicate. Indicates Reconfigure the system. Replace control if heating Missioning and Execute ’Set Factory Default mode’Control will still operate on default parameter set Ate feature will be set as ’installed’ and that could Low pressure switch failed open Sumes normal operation after fault is clearedFault is cleared Tion after fault is cleared Open or not within specifications −hour soft lock Out. Clears when flame has been proven stableSoft lockout or reset To flame failure Pair/add duct. Cleared after the current service de Is not running. Check power to outdoor unit. ClearsError after current is sensed in both RUN Vice is removed, or after power reset Sor run cycle, or after power reset Program Unit Capacity/Size Mode Finished Troubleshooting Heating Sequence of Operation Call for FIRST−STAGE Heat Call for SECOND−STAGE Heat Call for Heat Satisfied Call for Heat Satisfied FIRST−STAGE Heat SECOND−STAGE Heat 2ND Stage Heat Troubleshooting Cooling Sequence of Operation Call for Cooling Troubleshooting Continuous Fan Sequence of Operation Call for FAN