Lennox SL280DFV SERIES

©
2018 Lennox Industries Inc.
Dallas, Texas, USA
506698-01
07/2018
Supersedes 04/2017
SL280DFV
SERIES
GAS FURNACE
WARNING
Improper installation, adjustment, alteration,
service or maintenance can cause property damage,
personal injury or loss of life. Installation and service
must be performed by a licensed professional
HVAC installer or equivalent, service agency, or the
gas supplier.
WARNING
FIRE OR EXPLOSION HAZARD.
Failure to follow safety warnings exactly
could result in serious injury, death, or
property damage.
Do not store or use gasoline or other ammable
vapors and liquids in the vicinity of this or any
other appliance.
Installation and service must be performed
by a qualied installer, service agency or the
gas supplier.
WHAT TO DO IF YOU SMELL GAS:
• Do not try to light any appliance.
• Do not touch any electrical switch; do not use any
phone in your building.
• Leave the building immediately
• Immediately call your gas supplier from a neighbor’s
phone. Follow the gas supplier’s instructions.
• If you cannot reach your gas supplier, call the re
department.
USER’S INFORMATION
MANUAL

Lennox SL280DFV SERIES Specifications

General

Brand	Lennox
Model	SL280DFV SERIES
Category	Furnace
Language	English

Summary

Safety Warnings and Emergency Procedures

Installation and Service Safety

Critical warnings regarding improper installation, adjustment, alteration, or service of the furnace.

Fire and Explosion Hazards

Safety warnings about fire or explosion risks if safety instructions are not followed exactly.

Gas Leak Emergency Response

Step-by-step instructions on what to do if you smell gas, emphasizing immediate evacuation.

Unit Components and Advisories

Parts Identification

Visual guide identifying key components of the SL280DFV gas furnace via Figure 1.

Homeowner Guidance and Notices

Important notices for homeowners, including cautions for service and modifications.

Safety Instructions and Hazard Alerts

General Operating Precautions

Key instructions for safe furnace operation, covering clearances, airflow, and chemical avoidance.

Critical Hazard Warnings

Urgent warnings about asphyxiation, gas fumes, fire, explosion, and carbon monoxide risks.

Start-Up and Operation Procedures

Furnace Ignition System

Information on the SureLight ignition system and automatic burner lighting.

Operating the Gas Valve

Step-by-step instructions for operating the gas valve, including safety checks.

Turning Off Gas to the Unit

Procedure for safely shutting off the gas supply to the furnace.

Maintenance and Servicing

Filter Inspection and Replacement

Guidance on inspecting and replacing furnace filters for optimal operation and longevity.

Annual Maintenance Checks

Essential checks for furnace venting, heat exchanger, burners, and blower assembly.

Service Reminders and Checks

Checks to perform before calling a service technician, including power and thermostat settings.

Safety Precautions and Planned Service

Detecting Malfunctions and Hazards

Identifying signs of improper operation, unusual sounds, odors, and potential carbon monoxide exposure.

Flood-Damaged Furnace Warning

Critical warning against using a furnace that has been underwater due to extreme danger.

Annual Furnace Maintenance Schedule

Comprehensive checklist for annual service by a licensed technician to ensure safety and warranty compliance.

Operational Checks and Parts

System Operating Parameter Checks

Verifying system static pressure, airflow settings, and gas meter operation for correct firing rate.

Repair Parts Availability

Information on obtaining replacement parts and the requirement for professional installation.