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Nortek SL Series - User Manual

Nortek SL Series
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SINGLE STAGE & TWO-STAGE GAS FURNACES
USER’S MANUAL
NON-CONDENSING GAS FURNACES
CONDENSING GAS FURNACES
80+ AFUE 92.1% AFUE 95% & Up to 96% AFUE
*SA Upflow / Horizontal
Furnaces
*SC Upflow / Horizontal
Furnaces
*SD, *SD-E, & *TC
Upflow / Horizontal Furnaces
& *TE Furnaces (Upflow only)
*SK Downflow
Furnaces
*SL Downflow
Furnaces
*SM, *TL, *TN
Downflow Furnaces
WARNING
FIRE OR EXPLOSION HAZARD
• Failure to follow safety warnings exactly could
result in serious injury or property damage.
• Installation and service must be performed by
a qualified installer, service agency or the gas
supplier.
• Do not store or use gasoline or other flammable
vapors and liquids in the vicinity of this or any
other appliance.
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
neighbors phone. Follow the gas suppliers
instructions.
• If you cannot reach your gas supplier, call the
fire department.
DO NOT DESTROY. PLEASE READ CAREFULLY & KEEP IN A SAFE PLACE FOR FUTURE REFERENCE.

Table of Contents

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Questions and Answers

  • P
    Paul RogersNov 7, 2025
    What to do if my Nortek Furnace fails to operate?
    • A
      Amanda HernandezNov 7, 2025
      If your Nortek Furnace fails to operate, start by ensuring the thermostat is operating properly. Also, check if the blower compartment door(s) are securely in place and that the furnace disconnect is closed. Verify that the circuit breaker hasn't tripped or the control board fuse hasn't burned open, and that the gas supply is turned on. Inspect for any open manual reset switches and ensure the filter isn't dirty or plugged. Clean a coated flame sensor with steel wool, check for blockage in the condensate drain switch, make sure the secondary heat exchanger is free of debris and clogs, and ensure the evaporator coil is clean. Finally, check if all the LEDs on the furnace and motor control boards are constantly ON, and check the Blower Limit Switch and Flame Rollout Switch, resetting them if...

Summary

Important Safety Information

Gas Supply & Piping Safety

Proper installation and handling of gas supply and piping are crucial for safety and preventing fire or explosion.

Filter Operation and Safety

Never operate without a filter; dust buildup causes damage and fire. Keep filters clean for efficiency.

Flood Damage Precautions

Do not use a furnace that has been submerged; it is extremely dangerous and poses fire or explosion risks.

Venting System Safety

Proper venting prevents dangerous carbon monoxide production. Ensure terminals are unobstructed and seal openings.

Corrosion Hazards and Prevention

Avoid storing chemicals like solvents, cleaners, or refrigerants near the furnace to prevent heat exchanger corrosion.

Clearances to Combustibles

Keep furnace area clear of flammable materials, gasoline, and vapors to prevent fire or explosion.

About the Furnace

Filter Importance and Maintenance

Air filters are essential for performance and longevity. They must be installed, cleaned, or replaced regularly.

Startup and Shutdown Procedures

Starting the Furnace

Shutting Down the Furnace

Troubleshooting Common Issues

Maintenance and Inspection

Nortek SL Series Specifications

General IconGeneral
BrandNortek
ModelSL Series
CategoryFurnace
LanguageEnglish

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