York S1-7975-3281 Fan Switch

For field technicians and mechanical contractors, the York S1-7975-3281 Fan Switch serves as a reliable OEM solution for precise blower motor management. This F110-20F Fan Switch is a single-pole, single-throw (SPST) thermal control engineered to monitor plenum temperatures and regulate the fan circuit in gas furnaces and air handlers. Featuring a fixed 110°F cut-in temperature and a 90°F cut-out temperature, it ensures the blower operates only when the heat exchanger has reached a sufficient temperature, preventing the circulation of cold air during the startup cycle.

This genuine York replacement part is built on a standard 60T series 3/4-inch snap disc platform, making it a direct cross-reference for numerous legacy Source 1 and Coleman furnace models. As an auto-reset limit switch, it eliminates the need for manual intervention after a thermal trip, maintaining system uptime and protecting the heat exchanger from overheating. Whether you are performing a routine maintenance call or a critical furnace repair, utilizing this HVAC fan limit control ensures the system adheres to factory specifications for airflow timing and component protection.

• OEM Precision: Guaranteed 110°F close/90°F open thresholds for optimized blower cycling and energy efficiency.
• Wide Compatibility: Direct replacement for York, Coleman, and Evcon systems using part numbers S1-7966-3271 and S1-4066-3281.
• Robust Construction: Industrial-grade bi-metal disc designed for high-cycle reliability in residential and commercial heating applications.
• Simplified Installation: Standard flange mount design allows for quick integration into existing furnace wiring harnesses.

What does the F110-20F designation mean?
This indicates the switch closes at 110°F to start the fan and has a 20°F differential, meaning it will reopen and stop the fan once the temperature drops to 90°F.

Is this switch for the burner or the fan?
This is a fan control switch (normally open, closes on rise). It is not a high-limit safety for the burner, which typically requires a normally closed switch that opens on rise.

Can I use this in a Coleman gas furnace?
Yes, as an OEM Source 1 part, it is the standard replacement for many Coleman and Luxaire mobile home and residential gas furnaces.

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.