Lennox International Inc SL280UH090V48B, SL280UH070V36A, SL280UH090V36B Single Stage

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TABLE 11

SL280 Field Wiring Applications With Conventional Thermostat (Continued)

DIP Switch Settings and On−Board Links (figure 34)

	DIP Switch 1
Thermostat	Thermostat	On Board Links Must Be Cut To Select		Wiring Connections
	Heating	System Options
	Stages
Dual Fuel			L7724U	FURNACE	HEAT PUMP
Dual Fuel			L7724U	TERM. STRIP	HEAT PUMP
Single Stage	OFF		T’STAT	TERM. STRIP
Single Stage	OFF		T’STAT
Heat Pump
		CUT ON−BOARD LINK	H
		CUT ON−BOARD LINK
ComfortSense		W951		67M41*
7000 L7724U		HEAT
7000 L7724U		PUMP
thermostat w/		PUMP
thermostat w/
dual fuel capa-
bilities			L		L
Capable of 2					Y
stage gas heat			Y2
control
			D
			B	Y2
			T		outdoor
					outdoor
			T		sensor
			T
Dual Fuel			L7724U	FURNACE
Two Stage	OFF		T’STAT	TERM. STRIP	HEAT PUMP
Two Stage	OFF	CUT ON−BOARD LINK
Heat Pump		CUT ON−BOARD LINK
Heat Pump		W915	H
		2 STAGE	H
		2 STAGE
ComfortSense		COMPR		67M41*
ComfortSense				67M41*
7000 L7724U
thermostat w/		CUT ON−BOARD LINK
dual fuel capa-		CUT ON−BOARD LINK
dual fuel capa-		W951	L		L
bilities		W951	L		L
bilities		HEAT
Capable of 2		PUMP
Capable of 2
stage gas heat			Y2		Y2
control
			D
			B		out blue
			B
			T		outdoor
					outdoor
			T		sensor
			T

* Connect W1 to W1 ONLY if using defrost tempering kit 67M41

NOTE − Do NOT make a wire connection between the room thermostat L terminal and the L terminal of the SL280 integrated control.

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Image 31

Contents Table of Contents Installation Instructions SL280UHVEither Side Unit Dimensions − inches mmReturn air from both sides Side Return Air OpeningParts Arrangement Access Panel Blower AssemblySight Glass SL280UHV Gas Furnace Safety InformationShipping 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 Equipment in Confined Space ALL AIR from OutsideEquipment Confined Space ALL AIR from Outside Bottom Setting EquipmentBlower 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 Right Position Horizontal Left 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 PipingLeft−Side Air Discharge Horizontal ApplicationRight−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 RS−BUS Link TB82, future use Integrated Control+ = 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 Single Stage Thermostat Heating Operation with TWO−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