Supco SHL514 Limit Switch
The Supco SHL514 Limit Switch is a mission-critical L180-40 temperature control designed for direct integration into residential and commercial heating systems. Engineered for high-temperature protection, this board mounted limit switch features a fixed open temperature of 180°F to prevent heat exchanger damage and a fixed close temperature of 140°F for reliable reset. As a normally closed SPST switch, it ensuring circuit continuity during standard operation and breaks the line immediately upon exceeding thermal limits. With a 3.12" insertion length, it provides precise plenum sensing, making it an ideal HVAC replacement part for contractors troubleshooting short-cycling or blower fan failure. This robust auto-reset temperature control is an exact cross-reference for the 49L03, Goodman 37H73, and Bryant HH12ZB180, allowing for seamless field installation without modifications to the mounting profile.
- Universal Compatibility: Reliable furnace limit switch replacement for widely used OEM part numbers like 49L03.
- Precise Thermal Spec: Calibrated for 180°F cutout and 140°F differential reset to maintain safe operating parameters.
- Contractor-Grade Durability: Features a 1/2" bimetal temperature control design with UL recognized and CSA approved electrical ratings.
- Direct Mounting: Optimized for board mounted applications with a 3.12" probe for accurate plenum temperature feedback.
Common HVACR Contractor Questions:
How do I know if my furnace limit switch is bad?
Technicians typically diagnose a faulty Supco SHL514 when the blower fan runs continuously after the heating cycle or if the system shuts down prematurely (short cycling). Checking for continuity across the SPST switch terminals with a multimeter while the system is cool is the standard field test.
What causes a limit switch to trip repeatedly?
Frequent tripping is often a symptom of restricted airflow. Contractors should inspect for dirty filters, blocked return air ducts, or a failing blower motor, as these issues cause heat exchanger temperatures to exceed the 180°F limit.
Can the SHL514 replace a manual reset switch?
No. The SHL514 is an auto reset control. Safety protocols require using the specific reset type designated by the original equipment manufacturer to ensure proper system protection.
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.
Supco SHL514 Limit Switch
The Supco SHL514 Limit Switch is a mission-critical L180-40 temperature control designed for direct integration into residential and commercial heating systems. Engineered for high-temperature protection, this board mounted limit switch features a fixed open temperature of 180°F to prevent heat exchanger damage and a fixed close temperature of 140°F for reliable reset. As a normally closed SPST switch, it ensuring circuit continuity during standard operation and breaks the line immediately upon exceeding thermal limits. With a 3.12" insertion length, it provides precise plenum sensing, making it an ideal HVAC replacement part for contractors troubleshooting short-cycling or blower fan failure. This robust auto-reset temperature control is an exact cross-reference for the 49L03, Goodman 37H73, and Bryant HH12ZB180, allowing for seamless field installation without modifications to the mounting profile.
- Universal Compatibility: Reliable furnace limit switch replacement for widely used OEM part numbers like 49L03.
- Precise Thermal Spec: Calibrated for 180°F cutout and 140°F differential reset to maintain safe operating parameters.
- Contractor-Grade Durability: Features a 1/2" bimetal temperature control design with UL recognized and CSA approved electrical ratings.
- Direct Mounting: Optimized for board mounted applications with a 3.12" probe for accurate plenum temperature feedback.
Common HVACR Contractor Questions:
How do I know if my furnace limit switch is bad?
Technicians typically diagnose a faulty Supco SHL514 when the blower fan runs continuously after the heating cycle or if the system shuts down prematurely (short cycling). Checking for continuity across the SPST switch terminals with a multimeter while the system is cool is the standard field test.
What causes a limit switch to trip repeatedly?
Frequent tripping is often a symptom of restricted airflow. Contractors should inspect for dirty filters, blocked return air ducts, or a failing blower motor, as these issues cause heat exchanger temperatures to exceed the 180°F limit.
Can the SHL514 replace a manual reset switch?
No. The SHL514 is an auto reset control. Safety protocols require using the specific reset type designated by the original equipment manufacturer to ensure proper system protection.
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
Shipping & Returns
Shipping & Returns
Description
The Supco SHL514 Limit Switch is a mission-critical L180-40 temperature control designed for direct integration into residential and commercial heating systems. Engineered for high-temperature protection, this board mounted limit switch features a fixed open temperature of 180°F to prevent heat exchanger damage and a fixed close temperature of 140°F for reliable reset. As a normally closed SPST switch, it ensuring circuit continuity during standard operation and breaks the line immediately upon exceeding thermal limits. With a 3.12" insertion length, it provides precise plenum sensing, making it an ideal HVAC replacement part for contractors troubleshooting short-cycling or blower fan failure. This robust auto-reset temperature control is an exact cross-reference for the 49L03, Goodman 37H73, and Bryant HH12ZB180, allowing for seamless field installation without modifications to the mounting profile.
- Universal Compatibility: Reliable furnace limit switch replacement for widely used OEM part numbers like 49L03.
- Precise Thermal Spec: Calibrated for 180°F cutout and 140°F differential reset to maintain safe operating parameters.
- Contractor-Grade Durability: Features a 1/2" bimetal temperature control design with UL recognized and CSA approved electrical ratings.
- Direct Mounting: Optimized for board mounted applications with a 3.12" probe for accurate plenum temperature feedback.
Common HVACR Contractor Questions:
How do I know if my furnace limit switch is bad?
Technicians typically diagnose a faulty Supco SHL514 when the blower fan runs continuously after the heating cycle or if the system shuts down prematurely (short cycling). Checking for continuity across the SPST switch terminals with a multimeter while the system is cool is the standard field test.
What causes a limit switch to trip repeatedly?
Frequent tripping is often a symptom of restricted airflow. Contractors should inspect for dirty filters, blocked return air ducts, or a failing blower motor, as these issues cause heat exchanger temperatures to exceed the 180°F limit.
Can the SHL514 replace a manual reset switch?
No. The SHL514 is an auto reset control. Safety protocols require using the specific reset type designated by the original equipment manufacturer to ensure proper system protection.
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.
