Lennox International Inc Furnace Performance and Specifications for Lennox Models SL280UH090V48B and SL280UH090V60C

Page 43

BLOWER DATA

SL280UH090V60C 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%		1420					1565
+18%		1355					1490
+12%		1285					1415
+6%		1215					1335
Factory Default		1145					1260
–6%		1080					1185
–12%		1010					1110
–18%		940					1035
			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
+	1110	1205	1420		1680	1575		1740	2000		2305
Factory Default	1005	1100	1280		1545	1440		1595	1820		2125
–	890	1015	1125		1380	1295		1450	1610		1930

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%		1360					1500
+18%		1295					1425
+12%		1230					1355
+6%		1165					1280
Factory Default		1100					1210
–6%		1030					1135
–12%		965					1065
–18%		900					990
			COOLING
1 Cooling Speed		First Stage Cooling Speed - cfm					Second Stage Cooling Speed - cfm
DIP Switch
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
+	1050	1165	1335		1620	1515		1680	1915		2225
Factory Default	955	1060	1215		1480	1390		1545	1735		2060
–	840	945	1090		1290	1220		1385	1580		1825

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 480 cfm.

Page 43

Image 43

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