Manuals / Lennox International Inc / Household Appliance / Furnace

Lennox International Inc SL280UH090V36B, SL280UH090V48B, SL280UH070V36A 2ND Stage Heat

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

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Troubleshooting: Heating Sequence of Operation (Continued)

CALL FOR HEAT SATISFIED

FIRST−STAGE HEAT SECOND−STAGE HEAT

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RUN MODE:

1ST OR 2ND STAGE CALL FOR HEAT.

ALL INPUTS MONITORED (LIMIT, PRESSURE, CALL FOR HEAT/COOL, FLAME LEVEL)

2ND STAGE HEAT

NO

2ND STAGE

CALL FOR HEAT

SATISFIED?

YES

DE−ENERGIZE 2ND STAGE

GAS VALVE

INDUCER SPEED SWITCHED

TO LOW SPEED

INDOOR BLOWER SWITCHED

TO LOW HEAT SPEED

1ST STAGE HEAT

NO

1ST STAGE

CALL FOR HEAT

SATISFIED?

YES

GAS VALVE

DE−ENERGIZED

INDUCER OFF AFTER

5 SECOND POST PURGE

INDOOR BLOWER OFF

AFTER FIELD SELECTABLE

OFF DELAY

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Image 70

Lennox International Inc SL280UH090V36B Call for Heat Satisfied FIRST−STAGE Heat SECOND−STAGE Heat, 2ND Stage Heat

Contents

Installation Instructions SL280UHV Table of Contents Side Return Air Opening Unit Dimensions − inches mmReturn air from both sides Either Side Parts Arrangement Access Panel Blower AssemblySight Glass SL280UHV Gas Furnace Safety InformationShipping and Packing List Air Handler Unit Use of Furnace as Construction HeaterGeneral Evaporator Combustion, 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 Bottom Setting EquipmentBlower Motor Rigid LEG Indoor AIR 20 X 25 XFurnace Front Return AIR Base End Bottom Horizontal Application Installation Clearances Top LeftRight Typical Horizontal Application Filters Duct System Top Vent Discharge VentingUpflow Position Left Side Vent Discharge Horizontal Right Position Horizontal Left PositionSide Vent Discharge Sticker Common Venting Using Metal−Lined Masonry ChimneyDisconnected Vent 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 Gas Piping Ers or straps. Install a drip leg in vertical pipe runs to− In some localities, codes may require the installation Every 8 to 10 feet 2.44 to 3.01 m with suitable hang Left−Side Air Discharge Horizontal ApplicationRight−Side Air Discharge Electrostatic Discharge ESD Interior MAKE−UP BOX InstallationElectrical BOX Non−Communicating Communicating Icomfortt Integrated Control Outdoor Unit Icomfort Touch 120V Connections NON−COMMUNICATING System WiringCommunicating System Wiring 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 RS−BUS Link TB82, future use Integrated Control+ = Data High Connection − = Data LOW Connection −10% approx OFF On−Board Links 940 1045985 880 SL280UH090V36B Blower Performance less filter 1155 12801220 1095 1170 12951235 1110 1165 13601230 1100 1160 12901225 1380 +18% 1605 SL280UH110V60C Blower Performance less filter +18% 1785 SL280UH135V60D Blower Performance less filter Operating Sequence Compressor Thermostat energizes Y2 White Rodgers GAS Valve For Your Safety Read Before LightingUnit Start−Up Honeywell GAS Valve Proper Combustion Gas Pressure AdjustmentGAS Meter Clocking Chart Dial High Altitude Other Unit Adjustments Heating Sequence of Operation Heating Operation with Single Stage Thermostat Heating Operation with TWO−STAGE ThermostatSEC Service Electrical SHOCK, Fire Or Explosion Hazard 11− Back wash using steam. Begin from the burner opening SL280UHV BURNER, Combustion AIR Inducer Assembly13− To clean the combustion air inducer visually inspect 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 Power at the thermostat. Alert stops all services Normal operation 5 seconds after fault recoveredFurnace / air handler. Clears after fault recovered Equipment is unable to communicate. Indicates Control will still operate on default parameter set Reconfigure the system. Replace control if heatingMissioning and Execute ’Set Factory Default mode’ Ate feature will be set as ’installed’ and that could Fault is cleared Low pressure switch failed openSumes normal operation after fault is cleared Tion after fault is cleared Soft lockout or reset Open or not within specifications −hour soft lockOut. Clears when flame has been proven stable To flame failure Error after current is sensed in both RUN Pair/add duct. Cleared after the current service deIs not running. Check power to outdoor unit. Clears 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