Lennox 38M68 Limit Switch
The Lennox 38M68 Limit Switch is a critical safety component designed for precise thermal regulation within residential and light commercial HVAC systems. This Type L205-30F furnace limit control features a 3-inch insertion depth, specifically engineered to monitor heat exchanger temperatures and prevent hazardous overheating conditions. With an auto-reset 175-205F range, the switch opens the circuit at 205°F and automatically closes at 175°F to restore system operation. Maintaining a functional HVAC high limit switch is essential for protecting the primary heat exchanger and ensuring equipment longevity. This Lennox replacement part is built to meet OEM specifications, ensuring seamless electrical integration and reliable mechanical response times. For technicians performing furnace limit switch troubleshooting, the 38M68 provides a robust solution for restoring safety logic in Lennox-built air handlers and gas furnaces. Always verify the temperature profile and insertion length against the manufacturer’s data plate prior to installation.
Technical Specifications and Benefits- Precise Thermal Control: Features a fixed 205 degree Fahrenheit trip point with a 30-degree differential for consistent safety cycling.
- OEM Compatibility: Exact drop-in Lennox furnace parts replacement, eliminating the need for mounting bracket modifications.
- Automatic Reset Logic: Prevents permanent system lockout by automatically restoring the circuit once temperatures fall within safe parameters.
- Durable Construction: Engineered to withstand high-cycling environments within the furnace plenum.
What causes a limit switch to trip repeatedly?
Frequent tripping is often a symptom of restricted airflow, typically caused by a clogged filter, a failing blower motor, or obstructed ductwork rather than a faulty switch.
Can I use a different insertion length for this part?
No. Using an incorrect insertion length can result in inaccurate temperature readings, either causing premature tripping or failing to detect an overheat condition in time.
How do I verify if the 38M68 has failed?
Technicians should check for continuity across the terminals when the switch is cool; a lack of continuity indicates the internal bimetal disc or contacts have failed.
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.
Lennox 38M68 Limit Switch
The Lennox 38M68 Limit Switch is a critical safety component designed for precise thermal regulation within residential and light commercial HVAC systems. This Type L205-30F furnace limit control features a 3-inch insertion depth, specifically engineered to monitor heat exchanger temperatures and prevent hazardous overheating conditions. With an auto-reset 175-205F range, the switch opens the circuit at 205°F and automatically closes at 175°F to restore system operation. Maintaining a functional HVAC high limit switch is essential for protecting the primary heat exchanger and ensuring equipment longevity. This Lennox replacement part is built to meet OEM specifications, ensuring seamless electrical integration and reliable mechanical response times. For technicians performing furnace limit switch troubleshooting, the 38M68 provides a robust solution for restoring safety logic in Lennox-built air handlers and gas furnaces. Always verify the temperature profile and insertion length against the manufacturer’s data plate prior to installation.
Technical Specifications and Benefits- Precise Thermal Control: Features a fixed 205 degree Fahrenheit trip point with a 30-degree differential for consistent safety cycling.
- OEM Compatibility: Exact drop-in Lennox furnace parts replacement, eliminating the need for mounting bracket modifications.
- Automatic Reset Logic: Prevents permanent system lockout by automatically restoring the circuit once temperatures fall within safe parameters.
- Durable Construction: Engineered to withstand high-cycling environments within the furnace plenum.
What causes a limit switch to trip repeatedly?
Frequent tripping is often a symptom of restricted airflow, typically caused by a clogged filter, a failing blower motor, or obstructed ductwork rather than a faulty switch.
Can I use a different insertion length for this part?
No. Using an incorrect insertion length can result in inaccurate temperature readings, either causing premature tripping or failing to detect an overheat condition in time.
How do I verify if the 38M68 has failed?
Technicians should check for continuity across the terminals when the switch is cool; a lack of continuity indicates the internal bimetal disc or contacts have failed.
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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Product Information
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Description
The Lennox 38M68 Limit Switch is a critical safety component designed for precise thermal regulation within residential and light commercial HVAC systems. This Type L205-30F furnace limit control features a 3-inch insertion depth, specifically engineered to monitor heat exchanger temperatures and prevent hazardous overheating conditions. With an auto-reset 175-205F range, the switch opens the circuit at 205°F and automatically closes at 175°F to restore system operation. Maintaining a functional HVAC high limit switch is essential for protecting the primary heat exchanger and ensuring equipment longevity. This Lennox replacement part is built to meet OEM specifications, ensuring seamless electrical integration and reliable mechanical response times. For technicians performing furnace limit switch troubleshooting, the 38M68 provides a robust solution for restoring safety logic in Lennox-built air handlers and gas furnaces. Always verify the temperature profile and insertion length against the manufacturer’s data plate prior to installation.
Technical Specifications and Benefits- Precise Thermal Control: Features a fixed 205 degree Fahrenheit trip point with a 30-degree differential for consistent safety cycling.
- OEM Compatibility: Exact drop-in Lennox furnace parts replacement, eliminating the need for mounting bracket modifications.
- Automatic Reset Logic: Prevents permanent system lockout by automatically restoring the circuit once temperatures fall within safe parameters.
- Durable Construction: Engineered to withstand high-cycling environments within the furnace plenum.
What causes a limit switch to trip repeatedly?
Frequent tripping is often a symptom of restricted airflow, typically caused by a clogged filter, a failing blower motor, or obstructed ductwork rather than a faulty switch.
Can I use a different insertion length for this part?
No. Using an incorrect insertion length can result in inaccurate temperature readings, either causing premature tripping or failing to detect an overheat condition in time.
How do I verify if the 38M68 has failed?
Technicians should check for continuity across the terminals when the switch is cool; a lack of continuity indicates the internal bimetal disc or contacts have failed.
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.
