York S1-7970-3281/A Limit Switch
The York S1-7970-3281/A Limit Switch is a critical safety component designed for precise thermal monitoring in residential and light commercial HVAC systems. This high-limit cutout switch features a 145°F Open (FOP) and 115°F Close (FCLS) configuration, ensuring the furnace heat exchanger remains within safe operating parameters. Acting as a normally closed thermal disc, the S1-7970-3281/A interrupts the burner circuit if airflow is restricted or temperatures exceed the factory-set threshold. As a direct OEM replacement part, it ensures compatibility with specific York, Coleman, and Luxaire gas furnaces, maintaining the integrity of the original safety circuit. Technicians should verify furnace limit switch symptoms like short-cycling or inducer motor operation without ignition, as these often point to a failed or tripped L145-30 limit control. Proper installation requires verifying that the mounting flange and insertion depth align with the plenum requirements to prevent premature cycling.
Key Benefits for Technicians- Precise Thermal Calibration: Factory-set 145F open and 115F reset points prevent heat exchanger overheating and stress fractures.
- Direct OEM Fit: Eliminates the need for field modifications to mounting brackets or wiring harnesses, ensuring a secure furnace high limit switch replacement.
- Improved System Reliability: High-grade bimetal disc construction provides consistent response times across thousands of thermal cycles.
- Safety Compliance: Meets original manufacturer specifications for internal safety controls, maintaining the UL listing of the appliance.
What causes a limit switch to fail prematurely?
Repeated tripping is usually caused by restricted airflow, such as a clogged HVAC air filter, a failing blower motor, or undersized ductwork, which puts excessive thermal stress on the bimetal disc.
Can I bypass the S1-7970-3281/A for testing?
Temporary jumping for diagnostic purposes is permissible to confirm circuit continuity, but the unit must never be left operating without a functional furnace safety switch in place.
How do I confirm this is the correct York furnace part?
Cross-reference the L-number and temperature ratings stamped on the existing switch flange with the York S1-7970-3281/A specifications to ensure the thermal cutout matches the cabinet airflow requirements.
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: $36.30
-65%$36.30
$12.70York S1-7970-3281/A Limit Switch
The York S1-7970-3281/A Limit Switch is a critical safety component designed for precise thermal monitoring in residential and light commercial HVAC systems. This high-limit cutout switch features a 145°F Open (FOP) and 115°F Close (FCLS) configuration, ensuring the furnace heat exchanger remains within safe operating parameters. Acting as a normally closed thermal disc, the S1-7970-3281/A interrupts the burner circuit if airflow is restricted or temperatures exceed the factory-set threshold. As a direct OEM replacement part, it ensures compatibility with specific York, Coleman, and Luxaire gas furnaces, maintaining the integrity of the original safety circuit. Technicians should verify furnace limit switch symptoms like short-cycling or inducer motor operation without ignition, as these often point to a failed or tripped L145-30 limit control. Proper installation requires verifying that the mounting flange and insertion depth align with the plenum requirements to prevent premature cycling.
Key Benefits for Technicians- Precise Thermal Calibration: Factory-set 145F open and 115F reset points prevent heat exchanger overheating and stress fractures.
- Direct OEM Fit: Eliminates the need for field modifications to mounting brackets or wiring harnesses, ensuring a secure furnace high limit switch replacement.
- Improved System Reliability: High-grade bimetal disc construction provides consistent response times across thousands of thermal cycles.
- Safety Compliance: Meets original manufacturer specifications for internal safety controls, maintaining the UL listing of the appliance.
What causes a limit switch to fail prematurely?
Repeated tripping is usually caused by restricted airflow, such as a clogged HVAC air filter, a failing blower motor, or undersized ductwork, which puts excessive thermal stress on the bimetal disc.
Can I bypass the S1-7970-3281/A for testing?
Temporary jumping for diagnostic purposes is permissible to confirm circuit continuity, but the unit must never be left operating without a functional furnace safety switch in place.
How do I confirm this is the correct York furnace part?
Cross-reference the L-number and temperature ratings stamped on the existing switch flange with the York S1-7970-3281/A specifications to ensure the thermal cutout matches the cabinet airflow requirements.
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
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Description
The York S1-7970-3281/A Limit Switch is a critical safety component designed for precise thermal monitoring in residential and light commercial HVAC systems. This high-limit cutout switch features a 145°F Open (FOP) and 115°F Close (FCLS) configuration, ensuring the furnace heat exchanger remains within safe operating parameters. Acting as a normally closed thermal disc, the S1-7970-3281/A interrupts the burner circuit if airflow is restricted or temperatures exceed the factory-set threshold. As a direct OEM replacement part, it ensures compatibility with specific York, Coleman, and Luxaire gas furnaces, maintaining the integrity of the original safety circuit. Technicians should verify furnace limit switch symptoms like short-cycling or inducer motor operation without ignition, as these often point to a failed or tripped L145-30 limit control. Proper installation requires verifying that the mounting flange and insertion depth align with the plenum requirements to prevent premature cycling.
Key Benefits for Technicians- Precise Thermal Calibration: Factory-set 145F open and 115F reset points prevent heat exchanger overheating and stress fractures.
- Direct OEM Fit: Eliminates the need for field modifications to mounting brackets or wiring harnesses, ensuring a secure furnace high limit switch replacement.
- Improved System Reliability: High-grade bimetal disc construction provides consistent response times across thousands of thermal cycles.
- Safety Compliance: Meets original manufacturer specifications for internal safety controls, maintaining the UL listing of the appliance.
What causes a limit switch to fail prematurely?
Repeated tripping is usually caused by restricted airflow, such as a clogged HVAC air filter, a failing blower motor, or undersized ductwork, which puts excessive thermal stress on the bimetal disc.
Can I bypass the S1-7970-3281/A for testing?
Temporary jumping for diagnostic purposes is permissible to confirm circuit continuity, but the unit must never be left operating without a functional furnace safety switch in place.
How do I confirm this is the correct York furnace part?
Cross-reference the L-number and temperature ratings stamped on the existing switch flange with the York S1-7970-3281/A specifications to ensure the thermal cutout matches the cabinet airflow requirements.
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.
