Belimo B210B Valve is the critical seal required

is the critical seal required for McDonnell & Miller 47 Series

this device breaks the electrical circuit to the gas valve when temperature thresholds are exceeded

Using a multimeter to check the MFD output is the most accurate diagnostic method

As a veteran-grade temperature sensing component

Belimo B210B Valve is the critical seal requiredThe Belimo B210B Valve is a 1 2 inch 2 way characterized control valve engineered for precision in hydronic systems. Designed for both chilled and hot water applications, this valve handles media temperatures up to 212F and 60% glycol solutions with a 600 psi body pressure rating. It features a high performance nickel plated forged brass body coupled with a chrome plated brass ball and a nickel plated brass stem. The integrated equal percentage flow