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These valves are designed exclusively for negative pressure (pull through) applications. They use a counter spring to keep the valve in the closed position despite the downward pull of negative pressure.

With the main valve closed an adjustable bypass provides a minimum firing rate to the burner whenever the safety shut-off valve(s) is open. This is low fire to the heater. Since the pressure regulator maintains a constant supply pressure, the minimum firing rate is also held constant. The MR212's regulator is an integral component while a separate upstream pressure regulator is required for the M411, M511, and M611.

Note: This product should be installed by a licensed gas fitter.
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Manuals (1)


Pressure Rating:

5 psi

Used With:

Series 14

Series 24 System

Series 44 System

Series 94 System

Series SC10


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