Lennox International Inc Comprehensive Guide for Lennox SL280UH Gas Furnace Models

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Integrated Control

HUM

LINE 1

7 SEGMENT LED

FLAME SENSE

ACC

HS/ CAI

NEUTRAL

		INDOOR
	DIAGNOSTIC	BLOWER
	DIAGNOSTIC	CONNECTOR
	PUSH BUTTON	CONNECTOR
	PUSH BUTTON
	DIP SWITCHES
	OUTDOOR AIR	12 PIN LOW
	SENSOR	VOLTAGE
	TERMINALS	CONNECTOR

DISCHARGE AIR		W915 Y1 TO Y2
SENSOR		2 STAGE COMPR
TERMINALS		W951 R TO O
		W951 R TO O
TB83		HEAT PUMP
COMMUNICATING
OUTDOOR		W914 R TO DS
EQUIPMENT		W914 R TO DS
EQUIPMENT		DEHUM OR
		DEHUM OR
TB84	R I + I − C R I + I − C W1 W2 G Y2 Y1 C C R DH L O DS	HARMONY
COMMUNICATING
INDOOR
THERMOSTAT
	NON−COMMUNICATINGNG
	24V TERMINALS

RS−BUS LINK (TB82, future use)

I+ = DATA HIGH CONNECTION

I − = DATA LOW CONNECTION

RS−BUS OUTDOOR (TB83)

R = 24VAC

I + = DATA HIGH CONNECTION

I − = DATA LOW CONNECTION

C = 24VAXC COMMON

RS−BUS INDOOR (TB84)

R = 24VAC

I + = DATA HIGH CONNECTION

I − = DATA LOW CONNECTION

C = 24VAXC COMMON

1/4" QUICK CONNECT TERMINALS

HUM = UNPOWERED NORMALLY OPEN (DRY) CONTACTS XMFR = 120 VAC OUTPUT TO TRANSFORMER

LI = 120 VAC INPUT TO CONTROL

ACC = 120 VAC OUTPUT TO OPTIONAL ACCESSORY NEUTRALS = 120 VAC NEUTRAL

THERMOSTAT CONNECTIONS (TB1)

DS = DEHUMIDIFICATION SIGNAL

W2 = HEAT DEMAND FROM 2ND STAGE T/STAT

W1 = HEAT DEMAND FROM 1ST STAGE T/STAT R = CLASS 2 VOLTAGE TO THERMOSTAT

G = MANUAL FAN FROM T’STAT

C = THERMOSTAT SIGNAL GROUND CONNECTED TO TRANSFORMER GRD (TR) & CHASIS GROUND (GRD)

Y1 = THERMOSTAT 1ST STAGE COOL SIGNAL

Y2 = THERMOSTAT 2ND STAGE COOL SIGNAL

O = THERMOSTAT SIGNAL TO HEAT PUMP

REVERSING VALVE

DH = DEHUMIDIFICATION OUTPUT COMMUNICATING

THERMOSTAT ONLY

L = USE ONLY WITH A COMMUNICATING THERMOSTAT

AND A NON−COMMUNICATING OUTDOOR UNIT

FIGURE 34

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Image 35

Contents Table of Contents Installation Instructions SL280UHVEither Side Unit Dimensions − inches mmReturn air from both sides Side Return Air OpeningSight Glass Access Panel Blower AssemblyParts Arrangement Shipping and Packing List Safety InformationSL280UHV Gas Furnace Evaporator Use of Furnace as Construction HeaterGeneral Air Handler UnitCombustion, Dilution & Ventilation Air Space ALL AIR from Inside Equipment in ConfinedEquipment Confined Space ALL AIR from Outside Equipment in Confined Space ALL AIR from OutsideEquipment in Confined Space Blower Motor Rigid LEG Setting EquipmentBottom 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 DischargeSide Vent Discharge Horizontal Left PositionHorizontal Right Position 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 PipingRight−Side Air Discharge Horizontal ApplicationLeft−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 + = Data High Connection − = Data LOW Connection Integrated ControlRS−BUS Link TB82, future use −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 AdjustmentsSEC Heating Operation with TWO−STAGE ThermostatHeating Operation with Single Stage Thermostat 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