Maxitrol 3/4" Modulating Valve Set-Low Fire

B Series have both sides fitted for low fire adjustment. M Series valves are designed to operate on indirect fired atmospheric burner applications. These valves function in the same manner as the direct fired M valves. A pressure adjustment spring has been factory set to obtain an outlet pressure slightly above atmospheric pressure with the bypass closed and zero voltage being applied. Note: This product should be installed by a licensed gas fitter.