Lennox International Inc DAVE LENNOX SIGNATURE COLLECTION GAS FURNACE, SL280DFV Off

Page 33

NOTE − The off portion of the selected ramp profile also ap-

plies during heat pump operation in dual fuel applications.

TABLE 17

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

 

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

 

COMPRESSOR

 

DEMAND

Switches 11, 12 and 13 −− Heating Mode Blower Speed −− The switches are factory set to the OFF position which pro- vides normal heat speed. Refer to table 18 for switches 11, 12 and 13 that provided the corresponding increases or de- crease to both high and low heat demand.

TABLE 18

Heating Mode Blower Speeds

Heat Speed

Switch

Switch

Switch

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 19 provides continuous blower speed adjustments that will result from different switch settings.

TABLE 19

Continuous Blower Speed

Continuous

Switch 14

Switch 15

Blower Speed

 

 

 

 

 

28% of High Cool Speed

Off

On

 

 

 

38% of High Cool Speed

Off

Off

(Factory)

 

 

 

 

 

70% of High Cool Speed

On

Off

 

 

 

100% of High Cool Speed

On

On

 

 

 

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Contents Table of Contents Installation Instructions SL280DFVTOP View Unit Dimensions − inches mmParts Arrangement Safety Information SL280DFV Gas FurnaceShipping and Packing List General Use of Furnace as Construction HeaterCombustion, Dilution & Ventilation Air Equipment in Confined Space ALL AIR from Inside Equipment in Confined Space ALL AIR from Outside Equipment in Confined SpaceEquipment Confined Space ALL AIR from Outside NON−COMBUSTIBLE Floor Opening Size Downflow InstallationSL280DFV Unit Setting EquipmentCooling Coil Properly Plenum Sized Floor OpeningFilters Venting Duct SystemTables for installations −1/2 MIN MAX 126 FAN + FAN FAN + NAT 168 Carbon Monoxide Poisoning Hazard Gas PipingGas Pipe Capacity − ft3/hr m3/hr MAKE−UP BOX ElectricalNon−Communicating Icomfortt Integrated Control Outdoor Unit Icomfort Touch 120V Connections System WiringApplications 24V Humidifier ConnectionsSL280 Field Wiring Applications With Conventional Thermostat OFF Single Stage Thermostat w Dual fuel capa Bilities SL280DFV Schematic Wiring Diagram Typical SL280DFV Field Wiring Diagram + = Data High Connection − = Data LOW Connection Integrated Control−10% approx OFF On−Board Links Blower Data 1400 Operating System Demand System Response Sequence VAC Room Thermostat Calls for First Stage Cooling GAS Valve Shown in on Position Unit Start−UpProper Combustion Gas Pressure AdjustmentHigh Altitude Manifold Pressure SettingsHeating Sequence of Operation Other Unit AdjustmentsSEC Heating Operation with TWO−STAGE ThermostatElectrical SHOCK, Fire Or Explosion Hazard ServiceSL280DFV BURNER, Combustion AIR Inducer Assembly Page Repair Parts List Planned ServiceIntegrated Control Diagnostic Codes Integrated Control Diagnostic ModesEquipment is unable to communicate. Indicates Reconfigure the system. Replace control if heating Low pressure switch failed open To flame failure Limiters to protect the motor from damage caused Sor run cycle, or after power reset Volt power−up of the furnace control, 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
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DAVE LENNOX SIGNATURE COLLECTION GAS FURNACE, SL280DFV specifications

Lennox International Inc has made a significant mark in the heating, ventilation, and air conditioning (HVAC) industry, known for its commitment to innovation and energy efficiency. One of its standout products is the SL280DFV model, a high-efficiency gas furnace designed to meet the needs of modern homes.

The SL280DFV boasts an impressive Annual Fuel Utilization Efficiency (AFUE) rating of up to 80%. This rating indicates that the furnace converts 80% of the fuel it consumes into usable heat, making it a cost-effective choice for homeowners. The high efficiency not only reduces energy bills but also lessens the environmental impact by minimizing greenhouse gas emissions.

One of the key features of the SL280DFV is its two-stage gas valve operation. This technology allows the furnace to operate at two levels of heating output: low stage for milder days and high stage for extremely cold temperatures. This adaptability enhances comfort by maintaining more consistent indoor temperatures while also saving energy when full power is unnecessary.

Another innovative aspect of the SL280DFV is its variable-speed blower motor. This smart technology enables the furnace to adjust airflow based on the heating needs of a home, which promotes quiet operation and improved temperature consistency throughout living spaces.

The SL280DFV is equipped with a durable heat exchanger that is designed to withstand the rigors of daily use, contributing to the unit’s longevity. Additionally, the furnace features a smart ignition system that ensures reliable start-ups, so homeowners can depend on it through the coldest winter nights.

Safety is also a priority in the design of the SL280DFV. It includes various safety features such as a built-in flame sensor and advanced venting system, designed to avert hazardous situations and ensure optimal operation.

Furthermore, Lennox offers convenient installation and maintenance support, making the SL280DFV not only an efficient heating solution but also a practical choice for homeowners. With its blend of advanced technology, high efficiency, and reliability, the Lennox SL280DFV is an appealing option for those looking to upgrade their home’s heating system, promising comfort and peace of mind for many winters to come.
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