Description
The York S1-024-35776-000 is an OEM pressure switch engineered for use in York HVAC systems, providing reliable pressure-sensing protection to safeguard equipment operation. Designed with a Single Pole, Normally Open (SPNO) configuration, this switch closes upon a fall in pressure to its -0.40″ WC (inches of water column) set point — making it a critical safety and control component in furnace and air handler applications.
How It Works
This “Close On Fall” pressure switch monitors system pressure and activates (closes the circuit) when pressure drops to or below the -0.40″ WC threshold. This action is commonly used to confirm proper inducer draft operation in gas furnaces, preventing ignition if adequate negative pressure is not established — a key safety function.
Key Features
- Set Point: -0.40″ WC (inches of water column)
- Switch Type: SPNO — Single Pole, Normally Open
- Action: Close On Fall — switch closes when pressure drops to set point
- OEM York replacement part for precise fit and reliable performance
- Designed for use in York gas furnaces and HVAC air-handling equipment
- Helps prevent unsafe ignition by confirming proper inducer draft pressure
Application
This pressure switch is a direct OEM replacement for compatible York furnace models. Always verify compatibility with your specific unit’s model and serial number before installation. Consult York documentation or a qualified HVAC technician for proper installation and set point verification.
Why Choose OEM York Parts?
Using genuine York OEM components ensures your system operates within factory specifications, maintains warranty integrity, and delivers the reliability your customers expect. The S1-024-35776-000 is built to York’s exacting standards for long service life and dependable safety performance.







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