
Lennox 36M63 Limit Switch
The Lennox 36M63 Limit Switch is a critical safety component designed for precise thermal monitoring in HVAC residential heating systems. This L130-20F limit switch features a fixed temperature setpoint, engineered to open the electrical circuit at 130°F and automatically reset when the temperature drops to 110°F. As a genuine OEM replacement part, it ensures seamless furnace limit control, maintaining high-limit safety standards to prevent heat exchanger damage or system overheating. Utilizing an automatic reset configuration, this SPST switch provides reliable overheat protection in popular air handler and furnace models, including the AF80MPA series. Technicians should verify 36M6301 and 80A8301 compatibility when replacing legacy Lennox parts to ensure the system operates within exact manufacturer thermal specifications. This ruggedly constructed switch is built to handle the cycling demands of commercial and residential blowers without drifting from its 130-degree trip point.
Key Benefits- Direct OEM Compatibility: Replaces multiple legacy part numbers including 31F80, 80A83, and R20299001 for a perfect fit.
- Automatic Reset Functionality: Simplifies troubleshooting by restoring the circuit once the unit reaches the 110°F reset threshold.
- Enhanced System Safety: Protects the heat exchanger by acting as a primary safety limit switch during restricted airflow events.
- High-Precision Calibration: Factory-tested L130-20F settings ensure consistent performance across high-cycle heating applications.
- What are the trip and reset temperatures for this switch? The 36M63 is rated to open at 130°F and close at 110°F with a 20-degree differential.
- Will this part fit Armstrong or Ducane furnaces? Yes, this switch is cross-compatible with several Allied Air brands using part numbers 20283801 and 36M6301.
- Is this a manual or automatic reset switch? This specific model is an automatic reset limit switch, meaning it does not require a physical button press to restart.
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 36M63 Limit Switch
The Lennox 36M63 Limit Switch is a critical safety component designed for precise thermal monitoring in HVAC residential heating systems. This L130-20F limit switch features a fixed temperature setpoint, engineered to open the electrical circuit at 130°F and automatically reset when the temperature drops to 110°F. As a genuine OEM replacement part, it ensures seamless furnace limit control, maintaining high-limit safety standards to prevent heat exchanger damage or system overheating. Utilizing an automatic reset configuration, this SPST switch provides reliable overheat protection in popular air handler and furnace models, including the AF80MPA series. Technicians should verify 36M6301 and 80A8301 compatibility when replacing legacy Lennox parts to ensure the system operates within exact manufacturer thermal specifications. This ruggedly constructed switch is built to handle the cycling demands of commercial and residential blowers without drifting from its 130-degree trip point.
Key Benefits- Direct OEM Compatibility: Replaces multiple legacy part numbers including 31F80, 80A83, and R20299001 for a perfect fit.
- Automatic Reset Functionality: Simplifies troubleshooting by restoring the circuit once the unit reaches the 110°F reset threshold.
- Enhanced System Safety: Protects the heat exchanger by acting as a primary safety limit switch during restricted airflow events.
- High-Precision Calibration: Factory-tested L130-20F settings ensure consistent performance across high-cycle heating applications.
- What are the trip and reset temperatures for this switch? The 36M63 is rated to open at 130°F and close at 110°F with a 20-degree differential.
- Will this part fit Armstrong or Ducane furnaces? Yes, this switch is cross-compatible with several Allied Air brands using part numbers 20283801 and 36M6301.
- Is this a manual or automatic reset switch? This specific model is an automatic reset limit switch, meaning it does not require a physical button press to restart.
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 36M63 Limit Switch is a critical safety component designed for precise thermal monitoring in HVAC residential heating systems. This L130-20F limit switch features a fixed temperature setpoint, engineered to open the electrical circuit at 130°F and automatically reset when the temperature drops to 110°F. As a genuine OEM replacement part, it ensures seamless furnace limit control, maintaining high-limit safety standards to prevent heat exchanger damage or system overheating. Utilizing an automatic reset configuration, this SPST switch provides reliable overheat protection in popular air handler and furnace models, including the AF80MPA series. Technicians should verify 36M6301 and 80A8301 compatibility when replacing legacy Lennox parts to ensure the system operates within exact manufacturer thermal specifications. This ruggedly constructed switch is built to handle the cycling demands of commercial and residential blowers without drifting from its 130-degree trip point.
Key Benefits- Direct OEM Compatibility: Replaces multiple legacy part numbers including 31F80, 80A83, and R20299001 for a perfect fit.
- Automatic Reset Functionality: Simplifies troubleshooting by restoring the circuit once the unit reaches the 110°F reset threshold.
- Enhanced System Safety: Protects the heat exchanger by acting as a primary safety limit switch during restricted airflow events.
- High-Precision Calibration: Factory-tested L130-20F settings ensure consistent performance across high-cycle heating applications.
- What are the trip and reset temperatures for this switch? The 36M63 is rated to open at 130°F and close at 110°F with a 20-degree differential.
- Will this part fit Armstrong or Ducane furnaces? Yes, this switch is cross-compatible with several Allied Air brands using part numbers 20283801 and 36M6301.
- Is this a manual or automatic reset switch? This specific model is an automatic reset limit switch, meaning it does not require a physical button press to restart.
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.












