Lennox 38M67 Limit Switch
The Lennox 38M67 Limit Switch is a critical safety component designed for precise thermal regulation within Lennox residential furnaces and HVAC systems. This L190-30F furnace limit switch operates as a primary safety control, featuring a fixed temperature setting of 190°F for the high-limit cutout and a 30°F differential for the automatic reset. Built to handle 24V or 120V ignition systems, this SPST (Single Pole Single Throw) configuration ensures the burner circuit is interrupted if internal plenum temperatures exceed safe operating parameters. Whether you are performing a furnace blower repair or troubleshooting a limit switch tripping error code, this OEM-equivalent component ensures your installation meets HVAC safety standards. Its rugged construction facilitates reliable high-temperature air handling, making it a staple for service technicians maintaining peak performance in gas-fired heating units.
Key Performance Benefits
- Precise Thermal Calibration: Fixed 190°F open temperature prevents heat exchanger damage during airflow restrictions.
- Automatic Reset Function: Features a 30°F reset differential, allowing the system to resume operation once safe temperatures are restored.
- Broad Compatibility: Engineered for seamless integration into various Lennox and Armstrong furnace models requiring an L190-30F thermal switch.
- Simplified Installation: Standard 1/4-inch male spade terminals provide secure electrical connections for field technicians.
Common Contractor Questions
What causes a Lennox 38M67 limit switch to trip repeatedly?
Frequent tripping is usually indicative of restricted airflow, often caused by a restricted air filter, undersized ductwork, or a failing blower motor rather than a faulty sensor.
Can this switch be used in 24V and 120V circuits?
Yes, this component is rated for use in both low-voltage control circuits and line-voltage safety loops, depending on the wiring schematic of the specific furnace.
Is the 38M67 a manual or automatic reset?
This is an automatic reset switch, meaning it will close the circuit once the ambient temperature drops 30°F below the 190°F trip point.
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: $12.33
-65%$12.33
$4.32Lennox 38M67 Limit Switch
The Lennox 38M67 Limit Switch is a critical safety component designed for precise thermal regulation within Lennox residential furnaces and HVAC systems. This L190-30F furnace limit switch operates as a primary safety control, featuring a fixed temperature setting of 190°F for the high-limit cutout and a 30°F differential for the automatic reset. Built to handle 24V or 120V ignition systems, this SPST (Single Pole Single Throw) configuration ensures the burner circuit is interrupted if internal plenum temperatures exceed safe operating parameters. Whether you are performing a furnace blower repair or troubleshooting a limit switch tripping error code, this OEM-equivalent component ensures your installation meets HVAC safety standards. Its rugged construction facilitates reliable high-temperature air handling, making it a staple for service technicians maintaining peak performance in gas-fired heating units.
Key Performance Benefits
- Precise Thermal Calibration: Fixed 190°F open temperature prevents heat exchanger damage during airflow restrictions.
- Automatic Reset Function: Features a 30°F reset differential, allowing the system to resume operation once safe temperatures are restored.
- Broad Compatibility: Engineered for seamless integration into various Lennox and Armstrong furnace models requiring an L190-30F thermal switch.
- Simplified Installation: Standard 1/4-inch male spade terminals provide secure electrical connections for field technicians.
Common Contractor Questions
What causes a Lennox 38M67 limit switch to trip repeatedly?
Frequent tripping is usually indicative of restricted airflow, often caused by a restricted air filter, undersized ductwork, or a failing blower motor rather than a faulty sensor.
Can this switch be used in 24V and 120V circuits?
Yes, this component is rated for use in both low-voltage control circuits and line-voltage safety loops, depending on the wiring schematic of the specific furnace.
Is the 38M67 a manual or automatic reset?
This is an automatic reset switch, meaning it will close the circuit once the ambient temperature drops 30°F below the 190°F trip point.
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.
Product Information
Product Information
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Description
The Lennox 38M67 Limit Switch is a critical safety component designed for precise thermal regulation within Lennox residential furnaces and HVAC systems. This L190-30F furnace limit switch operates as a primary safety control, featuring a fixed temperature setting of 190°F for the high-limit cutout and a 30°F differential for the automatic reset. Built to handle 24V or 120V ignition systems, this SPST (Single Pole Single Throw) configuration ensures the burner circuit is interrupted if internal plenum temperatures exceed safe operating parameters. Whether you are performing a furnace blower repair or troubleshooting a limit switch tripping error code, this OEM-equivalent component ensures your installation meets HVAC safety standards. Its rugged construction facilitates reliable high-temperature air handling, making it a staple for service technicians maintaining peak performance in gas-fired heating units.
Key Performance Benefits
- Precise Thermal Calibration: Fixed 190°F open temperature prevents heat exchanger damage during airflow restrictions.
- Automatic Reset Function: Features a 30°F reset differential, allowing the system to resume operation once safe temperatures are restored.
- Broad Compatibility: Engineered for seamless integration into various Lennox and Armstrong furnace models requiring an L190-30F thermal switch.
- Simplified Installation: Standard 1/4-inch male spade terminals provide secure electrical connections for field technicians.
Common Contractor Questions
What causes a Lennox 38M67 limit switch to trip repeatedly?
Frequent tripping is usually indicative of restricted airflow, often caused by a restricted air filter, undersized ductwork, or a failing blower motor rather than a faulty sensor.
Can this switch be used in 24V and 120V circuits?
Yes, this component is rated for use in both low-voltage control circuits and line-voltage safety loops, depending on the wiring schematic of the specific furnace.
Is the 38M67 a manual or automatic reset?
This is an automatic reset switch, meaning it will close the circuit once the ambient temperature drops 30°F below the 190°F trip point.
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.
