Lennox 47L19 Limit Switch
The Lennox 47L19 Limit Switch is a critical OEM replacement part designed for precise thermal regulation in residential and commercial furnaces. As an auto-reset limit switch, this 36T series disc-style component operates on a normally closed circuit, ensuring the burner assembly remains functional only within safe operating parameters. When the internal plenum temperature reaches the 185°F high-limit threshold, the switch opens, breaking the circuit to prevent heat exchanger damage or hazardous overheating. Once the temperature drops to the 160°F cut-in point, the 160-185F AUTO Limit Switch automatically closes to restore system operation. This Lennox 47L19 model replaces several older part numbers, including LB-95349A and 44L6501, offering a direct fit for 80MGF series units. For HVAC contractors, maintaining this furnace high limit switch is essential for system safety and preventing premature component failure in high-output heating cycles.
Key Benefits- Automatic Reset Functionality: Eliminates the need for manual intervention by automatically restoring the circuit once safe temperatures (160°F) are reached.
- Precise Thermal Calibration: Engineered for a specific 160°F to 185°F range to match original equipment manufacturer factory specifications.
- Broad Compatibility: Direct replacement for Lennox, Allied, Armstrong, and Ducane part numbers like 36TX11 and LB-95359.
- Snap-Action Reliability: Features a 36T series disc design for fast, consistent switching and long-term durability in high-cycle environments.
How do I know if my Lennox 47L19 limit switch has failed?
A failed limit switch often results in the furnace blower running continuously while the burners stay off, or the system "short cycling." Test for continuity across the terminals when the switch is cool; a lack of continuity indicates the internal bimetal disc or contacts are defective.
Is the Lennox 47L19 a universal HVAC part?
No, this is a specific OEM Lennox part calibrated for a 25°F differential (185°F off / 160°F on). Always verify the temperature stamps on your existing switch to ensure it matches the 47L19 specifications before installation.
What causes this limit switch to trip repeatedly?
Frequent tripping is usually caused by restricted airflow, such as a clogged air filter, blocked return vents, or a failing blower motor, which allows the heat exchanger to exceed the 185°F safety limit.
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: $52.32
-65%$52.32
$18.31Lennox 47L19 Limit Switch
The Lennox 47L19 Limit Switch is a critical OEM replacement part designed for precise thermal regulation in residential and commercial furnaces. As an auto-reset limit switch, this 36T series disc-style component operates on a normally closed circuit, ensuring the burner assembly remains functional only within safe operating parameters. When the internal plenum temperature reaches the 185°F high-limit threshold, the switch opens, breaking the circuit to prevent heat exchanger damage or hazardous overheating. Once the temperature drops to the 160°F cut-in point, the 160-185F AUTO Limit Switch automatically closes to restore system operation. This Lennox 47L19 model replaces several older part numbers, including LB-95349A and 44L6501, offering a direct fit for 80MGF series units. For HVAC contractors, maintaining this furnace high limit switch is essential for system safety and preventing premature component failure in high-output heating cycles.
Key Benefits- Automatic Reset Functionality: Eliminates the need for manual intervention by automatically restoring the circuit once safe temperatures (160°F) are reached.
- Precise Thermal Calibration: Engineered for a specific 160°F to 185°F range to match original equipment manufacturer factory specifications.
- Broad Compatibility: Direct replacement for Lennox, Allied, Armstrong, and Ducane part numbers like 36TX11 and LB-95359.
- Snap-Action Reliability: Features a 36T series disc design for fast, consistent switching and long-term durability in high-cycle environments.
How do I know if my Lennox 47L19 limit switch has failed?
A failed limit switch often results in the furnace blower running continuously while the burners stay off, or the system "short cycling." Test for continuity across the terminals when the switch is cool; a lack of continuity indicates the internal bimetal disc or contacts are defective.
Is the Lennox 47L19 a universal HVAC part?
No, this is a specific OEM Lennox part calibrated for a 25°F differential (185°F off / 160°F on). Always verify the temperature stamps on your existing switch to ensure it matches the 47L19 specifications before installation.
What causes this limit switch to trip repeatedly?
Frequent tripping is usually caused by restricted airflow, such as a clogged air filter, blocked return vents, or a failing blower motor, which allows the heat exchanger to exceed the 185°F safety limit.
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 47L19 Limit Switch is a critical OEM replacement part designed for precise thermal regulation in residential and commercial furnaces. As an auto-reset limit switch, this 36T series disc-style component operates on a normally closed circuit, ensuring the burner assembly remains functional only within safe operating parameters. When the internal plenum temperature reaches the 185°F high-limit threshold, the switch opens, breaking the circuit to prevent heat exchanger damage or hazardous overheating. Once the temperature drops to the 160°F cut-in point, the 160-185F AUTO Limit Switch automatically closes to restore system operation. This Lennox 47L19 model replaces several older part numbers, including LB-95349A and 44L6501, offering a direct fit for 80MGF series units. For HVAC contractors, maintaining this furnace high limit switch is essential for system safety and preventing premature component failure in high-output heating cycles.
Key Benefits- Automatic Reset Functionality: Eliminates the need for manual intervention by automatically restoring the circuit once safe temperatures (160°F) are reached.
- Precise Thermal Calibration: Engineered for a specific 160°F to 185°F range to match original equipment manufacturer factory specifications.
- Broad Compatibility: Direct replacement for Lennox, Allied, Armstrong, and Ducane part numbers like 36TX11 and LB-95359.
- Snap-Action Reliability: Features a 36T series disc design for fast, consistent switching and long-term durability in high-cycle environments.
How do I know if my Lennox 47L19 limit switch has failed?
A failed limit switch often results in the furnace blower running continuously while the burners stay off, or the system "short cycling." Test for continuity across the terminals when the switch is cool; a lack of continuity indicates the internal bimetal disc or contacts are defective.
Is the Lennox 47L19 a universal HVAC part?
No, this is a specific OEM Lennox part calibrated for a 25°F differential (185°F off / 160°F on). Always verify the temperature stamps on your existing switch to ensure it matches the 47L19 specifications before installation.
What causes this limit switch to trip repeatedly?
Frequent tripping is usually caused by restricted airflow, such as a clogged air filter, blocked return vents, or a failing blower motor, which allows the heat exchanger to exceed the 185°F safety limit.
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.
