Lennox 97J49 Limit Switch
The Lennox 97J49 Limit Switch is a mission-critical safety component engineered for precise thermal regulation in residential and light commercial HVAC systems. This OEM Lennox replacement part functions as a high-limit safeguard, specifically calibrated for a 120-150F temperature range to protect the heat exchanger from catastrophic thermal stress. As a veteran-grade furnace limit switch, the 97J49 features an automatic reset (AUTO) mechanism, ensuring the system resumes operation once internal temperatures return to safe parameters, effectively preventing nuisance lockouts while maintaining rigid safety protocols.
Designed for seamless interface with Lennox air handlers and gas furnaces, this 120-150 degree limit switch provides the high-accuracy sensing required by modern diagnostic boards. Whether you are performing a routine preventative maintenance call or troubleshooting a frequent HVAC high limit trip, utilizing this genuine 97J4901 switch ensures the equipment operates within its original laboratory-tested specifications. The rugged internal contacts are built to withstand the rapid cycling and high-static environments common in modern high-efficiency forced-air systems.
Key Benefits for Technicians:- Precise Thermal Calibration: Fixed 120°F to 150°F range ensures exact high-limit protection for the heat exchanger.
- OEM Compatibility: Guaranteed fit for multiple Lennox and Armstrong furnace models, eliminating the need for field modifications.
- Automatic Reset Logic: The AUTO limit switch design reduces unnecessary service callbacks by restoring power once temperatures stabilize.
- Durable Construction: Engineered to maintain setpoint accuracy even after thousands of cycles in high-temperature plenums.
- What causes a Lennox 97J49 to trip repeatedly? Frequent tripping usually indicates restricted airflow due to a dirty filter, blocked secondary heat exchanger, or an undersized duct system.
- Can I bypass this switch for testing? While a temporary bypass may be used for a 30-second diagnostic check, the unit must never be left in operation without a functional 97J49 limit switch due to fire and equipment failure risks.
- Is this an exact replacement for the 97J4901? Yes, the 97J49 is the direct OEM replacement and supersedes previous versions of this specific thermal switch.
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: $34.15
-65%$34.15
$11.95Lennox 97J49 Limit Switch
The Lennox 97J49 Limit Switch is a mission-critical safety component engineered for precise thermal regulation in residential and light commercial HVAC systems. This OEM Lennox replacement part functions as a high-limit safeguard, specifically calibrated for a 120-150F temperature range to protect the heat exchanger from catastrophic thermal stress. As a veteran-grade furnace limit switch, the 97J49 features an automatic reset (AUTO) mechanism, ensuring the system resumes operation once internal temperatures return to safe parameters, effectively preventing nuisance lockouts while maintaining rigid safety protocols.
Designed for seamless interface with Lennox air handlers and gas furnaces, this 120-150 degree limit switch provides the high-accuracy sensing required by modern diagnostic boards. Whether you are performing a routine preventative maintenance call or troubleshooting a frequent HVAC high limit trip, utilizing this genuine 97J4901 switch ensures the equipment operates within its original laboratory-tested specifications. The rugged internal contacts are built to withstand the rapid cycling and high-static environments common in modern high-efficiency forced-air systems.
Key Benefits for Technicians:- Precise Thermal Calibration: Fixed 120°F to 150°F range ensures exact high-limit protection for the heat exchanger.
- OEM Compatibility: Guaranteed fit for multiple Lennox and Armstrong furnace models, eliminating the need for field modifications.
- Automatic Reset Logic: The AUTO limit switch design reduces unnecessary service callbacks by restoring power once temperatures stabilize.
- Durable Construction: Engineered to maintain setpoint accuracy even after thousands of cycles in high-temperature plenums.
- What causes a Lennox 97J49 to trip repeatedly? Frequent tripping usually indicates restricted airflow due to a dirty filter, blocked secondary heat exchanger, or an undersized duct system.
- Can I bypass this switch for testing? While a temporary bypass may be used for a 30-second diagnostic check, the unit must never be left in operation without a functional 97J49 limit switch due to fire and equipment failure risks.
- Is this an exact replacement for the 97J4901? Yes, the 97J49 is the direct OEM replacement and supersedes previous versions of this specific thermal switch.
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 97J49 Limit Switch is a mission-critical safety component engineered for precise thermal regulation in residential and light commercial HVAC systems. This OEM Lennox replacement part functions as a high-limit safeguard, specifically calibrated for a 120-150F temperature range to protect the heat exchanger from catastrophic thermal stress. As a veteran-grade furnace limit switch, the 97J49 features an automatic reset (AUTO) mechanism, ensuring the system resumes operation once internal temperatures return to safe parameters, effectively preventing nuisance lockouts while maintaining rigid safety protocols.
Designed for seamless interface with Lennox air handlers and gas furnaces, this 120-150 degree limit switch provides the high-accuracy sensing required by modern diagnostic boards. Whether you are performing a routine preventative maintenance call or troubleshooting a frequent HVAC high limit trip, utilizing this genuine 97J4901 switch ensures the equipment operates within its original laboratory-tested specifications. The rugged internal contacts are built to withstand the rapid cycling and high-static environments common in modern high-efficiency forced-air systems.
Key Benefits for Technicians:- Precise Thermal Calibration: Fixed 120°F to 150°F range ensures exact high-limit protection for the heat exchanger.
- OEM Compatibility: Guaranteed fit for multiple Lennox and Armstrong furnace models, eliminating the need for field modifications.
- Automatic Reset Logic: The AUTO limit switch design reduces unnecessary service callbacks by restoring power once temperatures stabilize.
- Durable Construction: Engineered to maintain setpoint accuracy even after thousands of cycles in high-temperature plenums.
- What causes a Lennox 97J49 to trip repeatedly? Frequent tripping usually indicates restricted airflow due to a dirty filter, blocked secondary heat exchanger, or an undersized duct system.
- Can I bypass this switch for testing? While a temporary bypass may be used for a 30-second diagnostic check, the unit must never be left in operation without a functional 97J49 limit switch due to fire and equipment failure risks.
- Is this an exact replacement for the 97J4901? Yes, the 97J49 is the direct OEM replacement and supersedes previous versions of this specific thermal switch.
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.
