Lennox 59W45 Limit Switch
The Lennox 59W45 Limit Switch is a critical safety component designed for precise thermal regulation within high-performance HVAC systems. This L150-40F limit control (MPN: 100847-08) features an SPST (Single Pole Single Throw) configuration with an open switch face, engineered to interrupt the electrical circuit once the discharge air or heat exchanger temperature reaches a fixed actuation temperature of 150°F. This prevents equipment overheating and potential downstream component damage. Once the system cools to the 40°F reset threshold, the automatic reset limit switch closes the circuit, restoring standard heating cycles. As a genuine Lennox OEM replacement part, it ensures exact fitment and electrical compatibility for unit models such as the LGH060S4, LGH048S4, and ZGB092S4. Built for durability in residential and light commercial gas furnaces and air handlers, this high-limit switch maintains the safe operating parameters required by professional contractors for reliable system maintenance and long-term performance.
Key Benefits
- Critical Thermal Protection: Automatically opens the circuit at 150°F to safeguard the heat exchanger and internal components from high-temperature excursions.
- Broad Compatibility: Specifically designed for Lennox HVAC equipment, including high-efficiency gas furnaces and electric air handlers utilizing 24V or 40V control circuits.
- OEM Reliability: Provides a direct 100847-08 replacement, maintaining the original engineering specifications for safety and system response.
- Simplified Installation: Features a standard mounting footprint and SPST terminals for rapid field replacement by service technicians.
Common Questions
What does the L150-40F designation mean on a Lennox limit switch?
The L150 indicates that the switch is a "Limit" control that opens (breaks the circuit) when it senses a rise to 150°F. The 40 indicates the reset temperature, meaning it will close the circuit once the temperature drops to 40°F.
Can I use a 59W45 limit switch in a non-Lennox furnace?
While this part is a genuine Lennox OEM part, compatibility is based on the temperature rating, reset type, and mounting profile. Technicians should verify the specific temperature requirements and terminal spacing of the original part before substituting.
Does the 59W45 require a manual reset?
No, this specific model is an auto-reset limit switch. It will automatically cycle back to the closed position once the high-temperature condition has subsided and the sensor reaches its 40°F reset 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: $15.43
-65%$15.43
$5.40Lennox 59W45 Limit Switch
The Lennox 59W45 Limit Switch is a critical safety component designed for precise thermal regulation within high-performance HVAC systems. This L150-40F limit control (MPN: 100847-08) features an SPST (Single Pole Single Throw) configuration with an open switch face, engineered to interrupt the electrical circuit once the discharge air or heat exchanger temperature reaches a fixed actuation temperature of 150°F. This prevents equipment overheating and potential downstream component damage. Once the system cools to the 40°F reset threshold, the automatic reset limit switch closes the circuit, restoring standard heating cycles. As a genuine Lennox OEM replacement part, it ensures exact fitment and electrical compatibility for unit models such as the LGH060S4, LGH048S4, and ZGB092S4. Built for durability in residential and light commercial gas furnaces and air handlers, this high-limit switch maintains the safe operating parameters required by professional contractors for reliable system maintenance and long-term performance.
Key Benefits
- Critical Thermal Protection: Automatically opens the circuit at 150°F to safeguard the heat exchanger and internal components from high-temperature excursions.
- Broad Compatibility: Specifically designed for Lennox HVAC equipment, including high-efficiency gas furnaces and electric air handlers utilizing 24V or 40V control circuits.
- OEM Reliability: Provides a direct 100847-08 replacement, maintaining the original engineering specifications for safety and system response.
- Simplified Installation: Features a standard mounting footprint and SPST terminals for rapid field replacement by service technicians.
Common Questions
What does the L150-40F designation mean on a Lennox limit switch?
The L150 indicates that the switch is a "Limit" control that opens (breaks the circuit) when it senses a rise to 150°F. The 40 indicates the reset temperature, meaning it will close the circuit once the temperature drops to 40°F.
Can I use a 59W45 limit switch in a non-Lennox furnace?
While this part is a genuine Lennox OEM part, compatibility is based on the temperature rating, reset type, and mounting profile. Technicians should verify the specific temperature requirements and terminal spacing of the original part before substituting.
Does the 59W45 require a manual reset?
No, this specific model is an auto-reset limit switch. It will automatically cycle back to the closed position once the high-temperature condition has subsided and the sensor reaches its 40°F reset 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 59W45 Limit Switch is a critical safety component designed for precise thermal regulation within high-performance HVAC systems. This L150-40F limit control (MPN: 100847-08) features an SPST (Single Pole Single Throw) configuration with an open switch face, engineered to interrupt the electrical circuit once the discharge air or heat exchanger temperature reaches a fixed actuation temperature of 150°F. This prevents equipment overheating and potential downstream component damage. Once the system cools to the 40°F reset threshold, the automatic reset limit switch closes the circuit, restoring standard heating cycles. As a genuine Lennox OEM replacement part, it ensures exact fitment and electrical compatibility for unit models such as the LGH060S4, LGH048S4, and ZGB092S4. Built for durability in residential and light commercial gas furnaces and air handlers, this high-limit switch maintains the safe operating parameters required by professional contractors for reliable system maintenance and long-term performance.
Key Benefits
- Critical Thermal Protection: Automatically opens the circuit at 150°F to safeguard the heat exchanger and internal components from high-temperature excursions.
- Broad Compatibility: Specifically designed for Lennox HVAC equipment, including high-efficiency gas furnaces and electric air handlers utilizing 24V or 40V control circuits.
- OEM Reliability: Provides a direct 100847-08 replacement, maintaining the original engineering specifications for safety and system response.
- Simplified Installation: Features a standard mounting footprint and SPST terminals for rapid field replacement by service technicians.
Common Questions
What does the L150-40F designation mean on a Lennox limit switch?
The L150 indicates that the switch is a "Limit" control that opens (breaks the circuit) when it senses a rise to 150°F. The 40 indicates the reset temperature, meaning it will close the circuit once the temperature drops to 40°F.
Can I use a 59W45 limit switch in a non-Lennox furnace?
While this part is a genuine Lennox OEM part, compatibility is based on the temperature rating, reset type, and mounting profile. Technicians should verify the specific temperature requirements and terminal spacing of the original part before substituting.
Does the 59W45 require a manual reset?
No, this specific model is an auto-reset limit switch. It will automatically cycle back to the closed position once the high-temperature condition has subsided and the sensor reaches its 40°F reset 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.
