Description
The York S1-1PS0309 is an OEM replacement pressure switch engineered for precise, reliable performance in York heating and air handling systems. Featuring a factory-set pressure sensing point of -0.90″ pressure factor (pf), this SPST (Single-Pole, Single-Throw) switch monitors draft inducer and combustion air pressure to protect the heat exchanger and ensure safe furnace operation. The 1/4″ barbed port connection provides a secure, leak-free interface with standard pressure tubing, making installation straightforward for HVAC technicians.
Key Features
- OEM York replacement pressure switch — direct fit for compatible York systems
- Set point: -0.90″ pressure factor (pf) for accurate draft/combustion air sensing
- 1/4″ barbed port connection for secure tubing attachment
- SPST (Single-Pole, Single-Throw) switching action
- Monitors inducer and combustion air pressure to protect heat exchanger integrity
- Prevents furnace operation under unsafe pressure conditions
- Designed for long-term reliability in residential and light commercial applications
Application
This pressure switch is designed to work within York furnace and air handler systems requiring a -0.90″ pf sensing threshold. It opens or closes the control circuit in response to changes in draft pressure, shutting down the burner if proper airflow is not confirmed — a critical safety function in modern induced-draft and condensing furnaces.
Installation Notes
- Always verify compatibility with your specific York model before installation
- Ensure pressure tubing is free of cracks, kinks, or blockages before connecting
- Use the 1/4″ barbed fitting with appropriate pressure tubing for a secure seal
- Consult York service documentation for wiring and mounting specifications
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