Lennox International Inc DAVE LENNOX SIGNATURE COLLECTION GAS FURNACE, SL280DFV

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TABLE 20

SL280DFV, Non−Communicating Thermostat with Humidity Control Feature and Single−Speed Outdoor Unit

OPERATING

 

 

 

SYSTEM DEMAND

 

 

SYSTEM RESPONSE

SEQUENCE

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Thermostat Demand

 

Relative Humidity

 

Blower

 

System

 

 

 

 

 

 

 

 

 

 

 

Step

 

 

 

W

 

 

 

 

Compressor

CFM

Comments

Condition

Y1

O

G

 

 

Status

D

 

1

 

 

 

(COOL)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

NO CALL FOR DEHUMIDIFICATION

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

24

 

 

Compressor and indoor

Normal Operation

1

On

On

On

 

 

 

Acceptable

High

100%

blower follow thermostat

 

 

 

VAC

 

 

 

 

 

 

 

 

 

 

 

demand

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

BASIC MODE (only active on a Y1 thermostat demand)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Normal Operation

1

On

On

On

 

 

 

Acceptable

24

High

100%

ComfortSense® 7000

 

 

 

 

 

 

 

 

 

VAC

 

 

thermostat energizes Y1

 

 

 

 

 

 

 

 

 

 

 

 

Dehumidification

2

On

On

On

 

 

 

Demand

0

High

70%*

and de−energizes D on a

 

 

 

call for de−humidification

Call

 

 

 

VAC

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

PRECISION MODE (operates independent of a Y1 thermostat demand)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Normal Operation

1

On

On

On

 

 

 

Acceptable

24

High

100%

 

 

 

 

VAC

Dehumidification mode

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

begins when humidity is

Dehumidification

 

 

 

 

 

 

 

 

0

 

 

2

On

On

On

 

 

 

Demand

High

70%*

greater than set point

call

 

 

 

VAC

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Dehumidification

 

 

 

 

 

 

 

 

0

 

 

ComfortSense® 7000

1

On

On

On

 

 

 

Demand

High

70%*

thermostat will try to main-

call ONLY

 

 

 

VAC

 

 

 

 

 

 

 

 

 

 

tain room humidity set-

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

point by allowing the room

 

Jumpers at indoor unit with a single stage outdoor unit

 

 

 

 

 

space to maintain a cooler

 

With Condensing unit − Cut W914 (R to DS) on SureLight® board

 

 

 

room thermostat set-

 

With Heat Pump − Cut W914 (R to DS) & W951 (R to O) on SureLight® board

 

point**

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ComfortSense® 7000 thermostat to use for this application − Y2081 4 heat / 2 cool *Dehumidification blower speed is 70% of COOL speed for all units .

**In Precision mode, ComfortSense® 7000 thermostat will maintain room temperature up to 2 °F (1.2°C) cooler than room setting.

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Contents Table of Contents Installation Instructions SL280DFVTOP View Unit Dimensions − inches mmParts Arrangement SL280DFV Gas Furnace Safety InformationShipping 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 Equipment in Confined Space ALL AIR from OutsideEquipment 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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