The York S1-024-21678-700 is an OEM 24V SPDT Relay designed for heavy-duty switching in residential and commercial HVAC control systems

also known as the W-48-HH drier core

engineered to regulate the primary air-to-fuel ratio within the burner assembly

54" WC trip point

streamlining the swap-out process for existing Functional Devices installations

Slant Fin 440-856-000 Pressure Switch The York S1-024-21678-700 is anThe Slant Fin 440 856 000 Pressure Switch is a critical safety component engineered specifically for high efficiency draft inducer monitoring. This OEM Slant Fin replacement part is calibrated to a fixed . 90" WC pressure setting, providing precise differential air pressure detection to ensure the combustion blower is moving sufficient air for safe burner operation. Designed for compatibility with the Slant Fin Victory II series, including models VHS