70" water column set point matches the equipment’s data plate

making it suitable for air handling units where moisture or strict fire codes are a concern

The FV-4M1 relies on a vertical float mechanism to actuate the valve plug

Use on non-compatible models may violate local codes and compromise safety

and general-purpose rejection-type fuse holders

York S1-024-35929-000 Pressure Switch 70" water column set pointThe York S1 024 35929 000 Pressure Switch is a critical safety component designed for precise HVAC airflow monitoring in high efficiency systems. Calibrated to a 0. 15" WC set point, this SPNO (Single Pole Normally Open) switch is engineered to close on a fall in pressure, ensuring the draft inducer has established a proper vacuum before allowing the ignition sequence to proceed. As the direct replacement for 024 35812 000, this OEM part maintains