Lennox International Inc SL280UH070V36A, SL280UH090V48B, SL280UH090V36B +18% 1605

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BLOWER DATA

SL280UH110V60C BLOWER PERFORMANCE (less filter)

BOTTOM RETURN AIR, RETURN AIR FROM BOTH SIDES OR RETURN AIR FROM BOTTOM AND ONE SIDE 0 through 0.8 in. w.g. (Heating) and 0 through 1.0 in. w.g. (Cooling) External Static Pressure Range

HEATING

1 Heating Speed
DIP Switch		First Stage Heating Speed - cfm					Second Stage Heating Speed - cfm
Settings
+24%		1690					1855
+18%		1605					1765
+12%		1525					1675
+6%		1445					1585
Factory Default		1360					1495
–6%		1280					1405
–12%		1200					1315
–18%		1115					1230
			COOLING
1 Cooling Speed		First Stage Cooling Speed - cfm					Second Stage Cooling Speed - cfm
DIP Switch	Low	Medium-Low	Medium-High		2 High	Low		Medium-Low	Medium-High		2 High
Settings	Low	Medium-Low	Medium-High		2 High	Low		Medium-Low	Medium-High		2 High
Settings
+	1060	1220	1330		1565	1535		1710	1910		2210
Factory Default	970	1075	1180		1430	1400		1565	1715		2015
–	875	980	1070		1255	1260		1400	1560		1815

SINGLE SIDE RETURN AIR

0 through 0.8 in. w.g. (Heating) and 0 through 1.0 in. w.g. (Cooling) External Static Pressure Range

HEATING

1 Heating Speed
DIP Switch		First Stage Heating Speed - cfm					Second Stage Heating Speed - cfm
Settings
+24%		1640					1805
+18%		1560					1715
+12%		1480					1630
+6%		1400					1545
Factory Default		1325					1455
–6%		1245					1370
–12%		1165					1280
–18%		1085					1195
			COOLING
1 Cooling Speed		First Stage Cooling Speed - cfm					Second Stage Cooling Speed - cfm
DIP Switch	Low	Medium-Low	Medium-High		2 High	Low		Medium-Low	Medium-High		2 High
Settings	Low	Medium-Low	Medium-High		2 High	Low		Medium-Low	Medium-High		2 High
Settings
+	1020	1160	1285		1550	1505		1690	1855		2125
Factory Default	940	1050	1155		1400	1375		1525	1685		1935
–	835	945	1020		1250	1235		1380	1505		1730

1Cooling and heating speeds are based on a combination of DIP switch settings on the furnace control. Refer to Installation Instructions for specific DIP Switch Settings.

2Factory default setting.

NOTES - The effect of static pressure is included in air volumes shown.

First stage HEAT is approximately 91% of the same second stage HEAT.

First stage COOL (two-stage air conditioning units only) is approximately 70% of the same second stage COOL speed position. Continuous Fan Only speed is selectable at 28%, 38%, 70% and 100% of the selected second stage cooling speed - minimum 500 cfm. Lennox Harmony III™ Zone Control Applications - Minimum blower speed is 485 cfm.

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Contents Table of Contents Installation Instructions SL280UHVReturn air from both sides Unit Dimensions − inches mmSide Return Air Opening Either SideAccess Panel Blower Assembly Parts ArrangementSight Glass Safety Information SL280UHV Gas FurnaceShipping and Packing List General Use of Furnace as Construction HeaterAir Handler Unit EvaporatorCombustion, 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 Furnace Front 20 X 25 XIndoor AIR Return AIR BaseRight Horizontal Application Installation Clearances Top LeftEnd Bottom Typical Horizontal ApplicationDuct System FiltersUpflow Position VentingTop Vent Discharge Left Side Vent DischargeHorizontal Left Position Horizontal Right PositionSide Vent Discharge Disconnected Vent Common Venting Using Metal−Lined Masonry ChimneySticker Vent PipeThrough 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 − In some localities, codes may require the installation Ers or straps. Install a drip leg in vertical pipe runs toGas Piping Every 8 to 10 feet 2.44 to 3.01 m with suitable hangHorizontal Application Left−Side Air DischargeRight−Side Air Discharge Electrical Interior MAKE−UP BOX InstallationElectrostatic Discharge ESD BOXCommunicating Non−CommunicatingIcomfortt Integrated Control Outdoor Unit Icomfort Touch Communicating System Wiring NON−COMMUNICATING System Wiring120V Connections ApplicationsDIP 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 985 1045940 880SL280UH090V36B Blower Performance less filter 1220 12801155 10951235 12951170 11101230 13601165 11001225 12901160 1380+18% 1605 SL280UH110V60C Blower Performance less filter +18% 1785 SL280UH135V60D Blower Performance less filter Operating Sequence Thermostat energizes Y2 CompressorUnit Start−Up For Your Safety Read Before LightingWhite Rodgers GAS Valve Honeywell GAS ValveGAS Meter Clocking Chart Gas Pressure AdjustmentProper Combustion DialHigh 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 Service13− To clean the combustion air inducer visually inspect SL280UHV BURNER, Combustion AIR Inducer Assembly11− Back wash using steam. Begin from the burner opening 17− Reinstall burner box, manifold assembly and burner boxSL280UHV NOX Inserts Repair Parts List Planned ServiceIntegrated Control Diagnostic Codes Integrated Control Diagnostic ModesFurnace / air handler. Clears after fault recovered Normal operation 5 seconds after fault recoveredPower at the thermostat. Alert stops all services Equipment is unable to communicate. IndicatesMissioning and Execute ’Set Factory Default mode’ Reconfigure the system. Replace control if heatingControl will still operate on default parameter set Ate feature will be set as ’installed’ and that couldSumes normal operation after fault is cleared Low pressure switch failed openFault is cleared Tion after fault is clearedOut. Clears when flame has been proven stable Open or not within specifications −hour soft lockSoft lockout or reset To flame failureIs not running. Check power to outdoor unit. Clears Pair/add duct. Cleared after the current service deError after current is sensed in both RUN Vice is removed, or after power resetSor 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