Lennox International Inc SL280UH070V36A, SL280UH090V48B, SL280UH090V36B Off

Page 37

TABLE 15

Cooling Mode Blower Speed Ramping

Ramping Option	Switch 9	Switch 10
A (Factory)	Off	Off
B	Off	On
C	On	Off
D	On	On

Ramping Option A (Factory Selection)

DMotor runs at 50% for 30 seconds.

DMotor then runs at 82% for approximately 7−1/2 minu- tes.

DIf demand has not been satisfied after 7−1/2 minutes, motor runs at 100% until demand is satisfied.

DOnce demand is met, motor runs at 50% for 30 sec- onds then ramps down to stop.

OFF

7 1/2 MIN

100%

OFF

82% CFM

CFM

1/2 MIN

1/2 MIN

50% CFM

50% CFM

COMPRESSOR DEMAND

Ramping Option B

SMotor runs at 82% for approximately 7−1/2 minutes. If demand has not been satisfied after 7−1/2 minutes, motor runs at 100% until demand is satisfied.

SOnce demand is met, motor ramps down to stop.

	7 1/2 MIN	100% CFM
OFF	82%CFM		OFF
	COMPRESSOR DEMAND

Ramping Option C

SMotor runs at 100% until demand is satisfied.

SOnce demand is met, motor runs at 100% for 45 sec- onds then ramps down to stop.

100% CFM	100% CFM	OFF
OFF		OFF

COMPRESSOR

DEMAND 45 SEC.

Ramping Option D

SMotor runs at 100% until demand is satisfied.

SOnce demand is met, motor ramps down to stop.

OFF	100% CFM
OFF	OFF
	COMPRESSOR
	DEMAND

Switches 11, 12 and 13 −− Heating Mode Blower Speed −− The switches are factory set to the OFF position which pro- vides factory default heat speed. Refer to table 16 for switches 11, 12 and 13 that provided the corresponding in- creases or decrease to both high and low heat demand.

TABLE 16

Heating Mode Blower Speeds

	Heat Speed	Switch	Switch	Switch
	Heat Speed	11	12	13
		11	12	13

	Increase 24%	On	On	On

	Increase 18%	On	On	Off

	Increase 12%	On	Off	On

	Increase 6%	On	Off	Off

	Factory Default	Off	Off	Off

	Decrease 6%	Off	Off	On

	Decrease 12%	Off	On	Off

	Decrease18%	Off	On	On

Switches 14 and 15 −− Continuous Blower Speed −− Table 17 provides continuous blower speed adjustments that will result from different switch settings.

TABLE 17

Continuous Blower Speed

	Continuous	Switch 14	Switch 15
	Blower Speed	Switch 14	Switch 15
	Blower Speed

	28% of High Cool Speed	Off	On

	38% of High Cool Speed	Off	Off
	(Factory)	Off	Off
	(Factory)

	70% of High Cool Speed	On	Off

	100% of High Cool Speed	On	On

Page 37

Image 37

Contents Table of Contents Installation Instructions SL280UHVReturn air from both sides Unit Dimensions − inches mmSide Return Air Opening Either SideParts Arrangement Access Panel Blower AssemblySight Glass SL280UHV Gas Furnace Safety InformationShipping 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 Equipment in Confined Space ALL AIR from OutsideEquipment Confined Space ALL AIR from Outside Bottom Setting EquipmentBlower 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 Right Position Horizontal Left 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 hangLeft−Side Air Discharge Horizontal ApplicationRight−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 RS−BUS Link TB82, future use Integrated Control+ = 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 Single Stage Thermostat Heating Operation with TWO−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