Lennox International Inc Your Guide to SL280UH Gas Furnace Models and Features

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icomfort Touch® Thermostat with SL280UHV

and Non−Communicating Outdoor Unit

icomfort Touch® Thermostat

icomfortt−Enabled SL280UHV Indoor Furnace Non−Communicating Outdoor Air Conditioner

icomfort Touch® Thermostat with SL280UHV

and icomfortt−ENABLED Outdoor Unit

icomfort Touch® Thermostat

icomfortt−Enabled SL280UHV Indoor Furnace

icomfortt−Enabled Outdoor Air Conditioner or Heat Pump

icomfortt−

ENABLED

SL280UHV

FURNACE

OPTIONAL

DISCHARGE

AIR SENSOR

icomfort Touch®

THERMOSTAT

OPTIONAL OUTDOOR AIR SENSOR

icomfortt−

ENABLED SL280UHV

FURNACE

OPTIONAL

DISCHARGE

AIR SENSOR

OPTIONAL OUTDOOR AIR SENSOR

icomfort Touch®

THERMOSTAT

icomfortt− ENABLED

OUTDOOR AIR CONDITIONING

OR HEAT PUMP UNIT

NON−COMMUNICATING

OUTDOOR AIR

CONDITIONING UNIT −

1 OR 2 STAGE

CLIP ON−BOARD LINK

W915 (Y1 TO Y2) FOR

TWO−STAGE OPERATION

NOTE − On communicating systems, extra wires must terminate on the "C" icomfortt terminal strip (RSBus). Use an additional wire and come off "C" terminal and wire nut all the extra wires together. Termination on the outdoor control must match the indoor control.

icomfortt Integrated Control

Outdoor Unit

icomfort Touch®

FIGURE 30

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Image 27

Contents Table of Contents Installation Instructions SL280UHVEither Side Unit Dimensions − inches mmReturn air from both sides Side Return Air OpeningAccess Panel Blower Assembly Parts ArrangementSight Glass Safety Information SL280UHV Gas FurnaceShipping and Packing List Evaporator Use of Furnace as Construction HeaterGeneral Air Handler UnitCombustion, Dilution & Ventilation Air Space ALL AIR from Inside Equipment in ConfinedEquipment in Confined Space ALL AIR from Outside Equipment in Confined SpaceEquipment Confined Space ALL AIR from Outside Setting Equipment BottomBlower Motor Rigid LEG Return AIR Base 20 X 25 XFurnace Front Indoor AIRTypical Horizontal Application Horizontal Application Installation Clearances Top LeftRight End BottomDuct System FiltersLeft Side Vent Discharge VentingUpflow Position Top Vent DischargeHorizontal Left Position Horizontal Right PositionSide Vent Discharge Vent Pipe Common Venting Using Metal−Lined Masonry ChimneyDisconnected Vent StickerThrough an unused masonry chimney flue is not considered Vent Connector102 127 −1/2 152 178 10−1/2 MIN MAX Feet FAN + FAN FAN + NAT 130 Carbon Monoxide Poisoning Hazard Every 8 to 10 feet 2.44 to 3.01 m with suitable hang Ers or straps. Install a drip leg in vertical pipe runs to− In some localities, codes may require the installation Gas PipingHorizontal Application Left−Side Air DischargeRight−Side Air Discharge BOX Interior MAKE−UP BOX InstallationElectrical Electrostatic Discharge ESDCommunicating Non−CommunicatingIcomfortt Integrated Control Outdoor Unit Icomfort Touch Applications NON−COMMUNICATING System WiringCommunicating System Wiring 120V ConnectionsDIP 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 880 1045985 940SL280UH090V36B Blower Performance less filter 1095 12801220 11551110 12951235 11701100 13601230 11651380 12901225 1160+18% 1605 SL280UH110V60C Blower Performance less filter +18% 1785 SL280UH135V60D Blower Performance less filter Operating Sequence Thermostat energizes Y2 CompressorHoneywell GAS Valve For Your Safety Read Before LightingUnit Start−Up White Rodgers GAS ValveDial Gas Pressure AdjustmentGAS Meter Clocking Chart Proper CombustionHigh Altitude Heating Sequence of Operation Other Unit AdjustmentsHeating Operation with TWO−STAGE Thermostat Heating Operation with Single Stage ThermostatSEC Electrical SHOCK, Fire Or Explosion Hazard Service17− Reinstall burner box, manifold assembly and burner box SL280UHV BURNER, Combustion AIR Inducer Assembly13− To clean the combustion air inducer visually inspect 11− Back wash using steam. Begin from the burner openingSL280UHV NOX Inserts Repair Parts List Planned ServiceIntegrated Control Diagnostic Codes Integrated Control Diagnostic ModesEquipment is unable to communicate. Indicates Normal operation 5 seconds after fault recoveredFurnace / air handler. Clears after fault recovered Power at the thermostat. Alert stops all servicesAte feature will be set as ’installed’ and that could Reconfigure the system. Replace control if heatingMissioning and Execute ’Set Factory Default mode’ Control will still operate on default parameter setTion after fault is cleared Low pressure switch failed openSumes normal operation after fault is cleared Fault is clearedTo flame failure Open or not within specifications −hour soft lockOut. Clears when flame has been proven stable Soft lockout or resetVice is removed, or after power reset Pair/add duct. Cleared after the current service deIs not running. Check power to outdoor unit. Clears Error after current is sensed in both RUNSor run cycle, or after power reset Finished Program Unit Capacity/Size ModeCall for FIRST−STAGE Heat Troubleshooting Heating Sequence of OperationCall for Heat Satisfied Call for SECOND−STAGE Heat2ND Stage Heat Call for Heat Satisfied FIRST−STAGE Heat SECOND−STAGE HeatCall for Cooling Troubleshooting Cooling Sequence of OperationCall for FAN Troubleshooting Continuous Fan Sequence of Operation