Lennox International Inc Complete Manual for Lennox SL280UH070V36A Furnace Setup and Operation
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On−Board Links

Note: In icomfortt systems with a conventional outdoor unit (non−communicating), the on−board clippable links must be set to properly configure the system.

WARNING

Carefully review all configuration information pro- vided. Failure to properly set DIP switches, jumpers and on−board links can result in improper operation!

On−Board Link W914 Dehum or Harmony (R to DS) On−board link W914, is a clippable connection between ter- minals R and DS on the integrated control. W914 must be cut when the furnace is installed with either the Harmony IIIt zone control or a thermostat which features humidity control. If the link is left intact the PMW signal from the Har- mony III control will be blocked and also lead to control damage. Refer to table 18 for operation sequence in ap- plications including SL280UHV, a thermostat which fea- tures humidity control and a single−speed outdoor unit. Table 19 gives the operation sequence in applications with a two−speed outdoor unit.

On−Board Link W951 Heat Pump (R to O)

On−board link W951 is a clippable connection between ter- minals R and O on the integrated control. W951 must be cut when the furnace is installed in applications which include a heat pump unit and a thermostat which features dual fuel use. If the link is left intact, terminal

gized eliminating the HEAT MODE in the heat pump.

On−Board Link W915 2 Stage Compr (Y1 to Y2) On−board link W915 is a clippable connection between ter- minals Y1 and Y2 on the integrated control. W915 must be cut if two−stage cooling will be used. If the Y1 to Y2 link is not cut the outdoor unit will operate in second−stage cooling only.

Diagnostic LED (Figure 34)

The seven−segment diagnostic LED displays operating status, target airflow, error codes and other information. The table beginning on Page 60 lists diagnostic LED codes.

Diagnostic Push Button (Figure 34)

The diagnostic push button is located adjacent to the seven−segment diagnostic LED. This button is used to en- able the Error Code Recall

mode. Press the button and hold it to cycle through a menu of options. Every five seconds a new menu item will be displayed. When the button is released, the displayed item will be selected. Once all items in the menu have been displayed, the menu resumes from the beginning until the button is released.

Error Code Recall Mode

Select "E" from the menu to access the most recent 10 error codes. Select

all error codes. Button must be pressed a second time while

Press the button until a solid ≡" is displayed to exit the Error Code Recall mode.

Flame Signal Mode

Select "F" from the menu to access the flame signal mode. The integrated control will display the flame current on 7 segment LED in in micro amps (uA).

Flame signal mode is exited after the following:

DPower is reset

DPressing and holding push button until 3 horizontal lines ≡" are displayed

D 10 minutes of entering the flame sense mode.

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Contents Installation Instructions SL280UHV Table of ContentsSide Return Air Opening Unit Dimensions − inches mmReturn air from both sides Either SideSight Glass Access Panel Blower AssemblyParts Arrangement Shipping and Packing List Safety InformationSL280UHV Gas Furnace Air Handler Unit Use of Furnace as Construction HeaterGeneral EvaporatorCombustion, Dilution & Ventilation Air Equipment in Confined Space ALL AIR from InsideEquipment Confined Space ALL AIR from Outside Equipment in Confined Space ALL AIR from OutsideEquipment in Confined Space Blower Motor Rigid LEG Setting EquipmentBottom Indoor AIR 20 X 25 XFurnace Front Return AIR BaseEnd Bottom Horizontal Application Installation Clearances Top LeftRight Typical Horizontal ApplicationFilters Duct SystemTop Vent Discharge VentingUpflow Position Left Side Vent DischargeSide Vent Discharge Horizontal Left PositionHorizontal Right Position Sticker Common Venting Using Metal−Lined Masonry ChimneyDisconnected Vent Vent PipeVent Connector Through an unused masonry chimney flue is not considered102 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 hangRight−Side Air Discharge Horizontal ApplicationLeft−Side Air Discharge Electrostatic Discharge ESD Interior MAKE−UP BOX InstallationElectrical BOXNon−Communicating CommunicatingIcomfortt Integrated Control Outdoor Unit Icomfort Touch 120V Connections NON−COMMUNICATING System WiringCommunicating System Wiring 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 + = Data High Connection − = Data LOW Connection Integrated ControlRS−BUS Link TB82, future use −10% approx OFF On−Board Links 940 1045985 880SL280UH090V36B Blower Performance less filter 1155 12801220 10951170 12951235 11101165 13601230 11001160 12901225 1380+18% 1605 SL280UH110V60C Blower Performance less filter +18% 1785 SL280UH135V60D Blower Performance less filter Operating Sequence Compressor Thermostat energizes Y2White Rodgers GAS Valve For Your Safety Read Before LightingUnit Start−Up Honeywell GAS ValveProper Combustion Gas Pressure AdjustmentGAS Meter Clocking Chart DialHigh Altitude Other Unit Adjustments Heating Sequence of OperationSEC Heating Operation with TWO−STAGE ThermostatHeating Operation with Single Stage Thermostat Service Electrical SHOCK, Fire Or Explosion Hazard11− 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 boxSL280UHV NOX Inserts Planned Service Repair Parts ListIntegrated Control Diagnostic Modes Integrated Control Diagnostic CodesPower 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. IndicatesControl 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 couldFault is cleared Low pressure switch failed openSumes normal operation after fault is cleared Tion after fault is clearedSoft lockout or reset Open or not within specifications −hour soft lockOut. Clears when flame has been proven stable To flame failureError 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 resetSor run cycle, or after power reset Program Unit Capacity/Size Mode FinishedTroubleshooting Heating Sequence of Operation Call for FIRST−STAGE HeatCall for SECOND−STAGE Heat Call for Heat SatisfiedCall for Heat Satisfied FIRST−STAGE Heat SECOND−STAGE Heat 2ND Stage HeatTroubleshooting Cooling Sequence of Operation Call for CoolingTroubleshooting Continuous Fan Sequence of Operation Call for FAN
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