Lennox 49K71 Limit Switch
The Lennox 49K71 Limit Switch is a critical safety component engineered for precision temperature monitoring in high-output furnace and air handler applications. This OEM furnace limit switch is factory-calibrated to an L220F trip point, ensuring the electrical circuit breaks immediately if internal temperatures exceed safe operating parameters. As a manual reset limit control, it requires a technician to physically intervene after a high-limit event, providing a vital opportunity to diagnose airflow restrictions or heat exchanger issues before restoring system operation.
Constructed with a robust therm-o-disc limit control housing, the Lennox 49K71 (also found under part number 149K7101) features high-capacity electrical contacts designed for 24V systems. Its snap-action mechanism ensures instantaneous switching, preventing the arcing or fluttering often seen in lower-quality aftermarket alternatives. This L220F manual reset switch is a direct replacement for various Lennox residential and industrial heating units, maintaining the structural integrity and safety standards established by the original equipment manufacturer.
Key Benefits- Precise Thermal Protection: Fixed L220F temperature range prevents heat exchanger damage by terminating the heating cycle during overheat conditions.
- Manual Reset Safety: Forces a manual inspection of the HVAC system, ensuring underlying faults like a failed blower motor or dirty filter are addressed.
- OEM Reliability: Genuine Lennox replacement part ensures exact fitment and terminal alignment for faster field installation.
- Industrial-Grade Build: Engineered to withstand high-vibration and moisture-prone environments common in heavy-duty furnace applications.
Is the Lennox 49K71 an automatic or manual reset switch?
This is a manual reset limit switch. Once the 220°F threshold is reached, the internal contacts remain open until the reset button is manually depressed by a technician.
What causes a 220-degree limit switch to trip?
Tripping is typically caused by restricted airflow, which can stem from a clogged air filter, blocked return ducts, or a failing indoor blower motor. It is a protective measure to prevent the heat exchanger from cracking.
Can I use an aftermarket L220F switch instead of the 49K71?
While aftermarket parts may share the 220°F rating, OEM limit switches like the 49K71 are tested specifically for Lennox internal cabinetry airflow patterns and mounting depths to ensure accurate sensing.
This item is not eligible for free shipping.
Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.
Original: $78.45
-65%$78.45
$27.46Lennox 49K71 Limit Switch
The Lennox 49K71 Limit Switch is a critical safety component engineered for precision temperature monitoring in high-output furnace and air handler applications. This OEM furnace limit switch is factory-calibrated to an L220F trip point, ensuring the electrical circuit breaks immediately if internal temperatures exceed safe operating parameters. As a manual reset limit control, it requires a technician to physically intervene after a high-limit event, providing a vital opportunity to diagnose airflow restrictions or heat exchanger issues before restoring system operation.
Constructed with a robust therm-o-disc limit control housing, the Lennox 49K71 (also found under part number 149K7101) features high-capacity electrical contacts designed for 24V systems. Its snap-action mechanism ensures instantaneous switching, preventing the arcing or fluttering often seen in lower-quality aftermarket alternatives. This L220F manual reset switch is a direct replacement for various Lennox residential and industrial heating units, maintaining the structural integrity and safety standards established by the original equipment manufacturer.
Key Benefits- Precise Thermal Protection: Fixed L220F temperature range prevents heat exchanger damage by terminating the heating cycle during overheat conditions.
- Manual Reset Safety: Forces a manual inspection of the HVAC system, ensuring underlying faults like a failed blower motor or dirty filter are addressed.
- OEM Reliability: Genuine Lennox replacement part ensures exact fitment and terminal alignment for faster field installation.
- Industrial-Grade Build: Engineered to withstand high-vibration and moisture-prone environments common in heavy-duty furnace applications.
Is the Lennox 49K71 an automatic or manual reset switch?
This is a manual reset limit switch. Once the 220°F threshold is reached, the internal contacts remain open until the reset button is manually depressed by a technician.
What causes a 220-degree limit switch to trip?
Tripping is typically caused by restricted airflow, which can stem from a clogged air filter, blocked return ducts, or a failing indoor blower motor. It is a protective measure to prevent the heat exchanger from cracking.
Can I use an aftermarket L220F switch instead of the 49K71?
While aftermarket parts may share the 220°F rating, OEM limit switches like the 49K71 are tested specifically for Lennox internal cabinetry airflow patterns and mounting depths to ensure accurate sensing.
This item is not eligible for free shipping.
Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.
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Description
The Lennox 49K71 Limit Switch is a critical safety component engineered for precision temperature monitoring in high-output furnace and air handler applications. This OEM furnace limit switch is factory-calibrated to an L220F trip point, ensuring the electrical circuit breaks immediately if internal temperatures exceed safe operating parameters. As a manual reset limit control, it requires a technician to physically intervene after a high-limit event, providing a vital opportunity to diagnose airflow restrictions or heat exchanger issues before restoring system operation.
Constructed with a robust therm-o-disc limit control housing, the Lennox 49K71 (also found under part number 149K7101) features high-capacity electrical contacts designed for 24V systems. Its snap-action mechanism ensures instantaneous switching, preventing the arcing or fluttering often seen in lower-quality aftermarket alternatives. This L220F manual reset switch is a direct replacement for various Lennox residential and industrial heating units, maintaining the structural integrity and safety standards established by the original equipment manufacturer.
Key Benefits- Precise Thermal Protection: Fixed L220F temperature range prevents heat exchanger damage by terminating the heating cycle during overheat conditions.
- Manual Reset Safety: Forces a manual inspection of the HVAC system, ensuring underlying faults like a failed blower motor or dirty filter are addressed.
- OEM Reliability: Genuine Lennox replacement part ensures exact fitment and terminal alignment for faster field installation.
- Industrial-Grade Build: Engineered to withstand high-vibration and moisture-prone environments common in heavy-duty furnace applications.
Is the Lennox 49K71 an automatic or manual reset switch?
This is a manual reset limit switch. Once the 220°F threshold is reached, the internal contacts remain open until the reset button is manually depressed by a technician.
What causes a 220-degree limit switch to trip?
Tripping is typically caused by restricted airflow, which can stem from a clogged air filter, blocked return ducts, or a failing indoor blower motor. It is a protective measure to prevent the heat exchanger from cracking.
Can I use an aftermarket L220F switch instead of the 49K71?
While aftermarket parts may share the 220°F rating, OEM limit switches like the 49K71 are tested specifically for Lennox internal cabinetry airflow patterns and mounting depths to ensure accurate sensing.
This item is not eligible for free shipping.
Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.
