The York S1-7705-3591 is an OEM automatic limit switch engineered to protect York furnaces and heating systems from dangerous overtemperature conditions. Designed as a direct factory replacement, this limit switch monitors heat exchanger temperatures and automatically interrupts the burner circuit when temperatures exceed the upper threshold, then resets itself once safe operating temperatures are restored — no manual intervention required.
How It Works
This automatic (AUTO) limit switch opens the control circuit when the sensed temperature reaches the upper set point, shutting down the burner to prevent heat exchanger damage, component failure, or fire hazard. Once the temperature drops back to the lower set point, the switch automatically resets and restores normal furnace operation — making it ideal for applications where continuous, unattended operation is required.
Key Specifications
- Brand: York (OEM Replacement)
- Part Number: S1-7705-3591
- Switch Type: AUTO (Automatic Reset)
- Trip Temperature: 145°F
- Reset Temperature: 125°F
- Application: York furnaces and heating equipment
Features & Benefits
- OEM York replacement part for assured fit and compatibility
- Automatic reset eliminates the need for manual intervention after a trip event
- Protects heat exchangers and furnace components from overheating damage
- Helps maintain system efficiency and extends equipment service life
- Direct drop-in replacement for simplified installation
Application
The S1-7705-3591 is designed for use in York residential and light commercial furnaces. Always verify compatibility with your specific unit model before installation. Consult the equipment service manual for proper mounting location and wiring procedures.
