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©2025 Lennox Industries Inc.
Dallas, Texas, USA
508564-01
01/2025
Do not store or use gasoline or other flammable
vapors and liquids in the vicinity of this or any
other appliance.
Installation and service must be performed
by a qualified installer, service agency or the
gas supplier.
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.
USER'S INFORMATION
WARNING
This furnace is equipped with an ignition control
factory enabled for use with Lennox A2L refrigerant
systems.
Disabling
the
functionality on A2L system is prohibited by safety
codes. Refer to furnace installation instructions for
non-A2L and non-Lennox refrigerant system setup.
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.
• 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 fire department.
MANUAL
SL280DFNVK
SERIES
refrigerant
detection
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Summary of Contents for Lennox SL280DFNVK Series
- Page 1 SL280DFNVK SERIES 508564-01 01/2025 WARNING This furnace is equipped with an ignition control factory enabled for use with Lennox A2L refrigerant systems. Disabling refrigerant detection functionality on A2L system is prohibited by safety codes. Refer to furnace installation instructions for non-A2L and non-Lennox refrigerant system setup.
- Page 2 SL280DFNVK Parts Identification BLOWER LOW GWP IGNITION MOTOR CONTROL COMBUSTION AIR INDUCER GAS VALVE HEAT EXCHANGER ASSEMBLY FIGURE 1 NOTE - This manual is the property of the homeowner If this is not possible, the water supply to the house should and must be left with the equipment user.
- Page 3 Reliable de- tectors are available at reasonable retail prices. Contact the furnace is installed. Take care to maintain your Lennox dealer for more details about this invest- established clearances surrounding the furnace. ment in your safety.
- Page 4 HONEYWELL/RESIDEO GAS VALVE TWO STAGE, VARIABLE SPEED, COMMUNICATING 107899-01 MANIFOLD PRESSURE ADJUSTMENT (TURN CCW TO INCREASE PRESSURE) NEGATIVE AIR POSITIVE AIR PRESSURE PORT PRESSURE PORT OUTLET INLET SUPPLY MANIFOLD PRESSURE PRESSURE TAP GAS VALVE SHOWN IN THE ON POSITION FIGURE 3 Turning Off Gas to the Unit WARNING If overheating occurs or if gas supply fails to shut off,...
- Page 5 OR EXPLOSION HAZARD. Service Reminder Failure to follow safety warnings exactly Call your Lennox service technician if the unit will not op- could result in dangerous operation, serious erate. Before calling, always check the following to be injury, death or property damage.
- Page 6 If you discover any of the following, shut down your unit, if necessary and contact a Lennox dealer for an inspection by a licensed 7 - Inspect the combustion air inducer and clean if professional service technician (or equivalent).
- Page 7 Blower Parts Repair Parts Blower wheel The following repair parts are available through Lennox Motor dealers. When ordering parts, include the complete fur- Blower housing cut-off plate nace model number listed on the CSA International name- plate -- Example: SL280DF060NV36BK-0. All service...
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