York S1-024-35272-000 Air Pressure Switch WC Falling SPNO - 0.54

The York S1-024-35272-000 is a negative air pressure switch designed for HVAC system safety and control applications. This switch monitors pressure differential and activates on falling pressure at -0.54 inches water column (WC), making it ideal for verifying proper draft and combustion air flow in furnaces and heating systems.

Key Features:

• Activation pressure: -0.54 inches water column on falling pressure
• SPNO (Single Pole Normally Open) contact configuration
• Designed for use in York furnaces and HVAC equipment
• Ensures safe operation by monitoring pressure differentials
• Direct OEM replacement part for reliable performance

This pressure switch serves as a critical safety component, ensuring that proper draft conditions exist before allowing the heating system to operate. The normally open contact closes when the specified negative pressure is reached during falling pressure conditions, providing a signal to the control board that adequate ventilation is present.