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

Efficient Retrofitting: Allows for quick sensor replacement without draining the system or replacing the entire well

while the side ports are standard 1/4" SAE flare

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

Refer to the wiring diagram on the Lennox 10P17 housing

Berko 4520-2048-000 Limit Switch providing a 40°F differential thatThe 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,