the York S1-025-26392-704 serves as a direct OEM replacement limit switch for several residential and commercial configurations

making it an ideal replacement for standard 230V HVAC/R motor applications

This seal is typically installed at the bottom of the section ports to establish a secure fluid connection between the cast iron sections of the boiler block

providing a 40°F differential that ensures stable blower cycles and prevents short-cycling

Berko 4520-2048-000 Limit Switch the York S1-025-26392-704 serves asThe Berko 4520 2048 000 is an OEM 135F CO Auto Limit Switch designed for high performance thermal regulation in Marley Engineered Products and QMark 900 Series B heating systems. This 2 pole limit switch operates with an automatic reset mechanism, functioning as a critical safety component that opens on temperature rise to prevent overheating. Engineered for HVACR technical specifications, it features a single pole single throw (SPST) switch action,