Maxitrol MR212D-1010 Valve

For veteran HVAC contractors managing direct-fired burner systems, the Maxitrol MR212D-1010 is the specific 1 1/4" NPT modulating gas valve designed for negative pressure applications. Engineered to handle a maximum inlet pressure of 5 PSI, this component functions as both a modulator and a high-performance gas pressure regulator, eliminating the need for a separate upstream regulator in most configurations. It is identical to the MR212D-1-1/4, ensuring seamless drop-in compatibility for Selectra Series 14, 24, 44, and 94 systems. The valve utilizes a dual-spring assembly to maintain precise low fire and high fire settings, resisting the downward pull of negative pressure (pull-through) systems. With a 400mA maximum current draw and a robust 12.5 PSI emergency exposure rating, the Maxitrol MR212D-1010 valve provides linear, non-fluctuating temperature control across industrial ovens and space-constrained air makeup units without requiring external mechanical activation.

• Dual-Function Design: Integrates modulation and regulation into a single 1 1/4" NPT housing to simplify piping and reduce potential leak points.
• Negative Pressure Optimized: Specifically counter-sprung to prevent unrequested valve opening in high-velocity pull-through burner designs.
• Enhanced Flow Capacity: Delivers high-volume gas flow with a Leak-Tite seal for reliable performance in demanding commercial environments.
• Field Adjustable: Factory set for applications up to -1.5" w.c. but field-adjustable up to -3.5" w.c. to match specific site requirements.
• Direct fired Compatibility: Optimized for use with Maxitrol SC11S signal conditioners and Selectra electronic systems.

Is an external regulator required for the MR212D-1010?
No, this model acts as its own regulator for inlet pressures up to 5 PSI, though your specific local codes and burner specifications should always be verified for upstream safety requirements.

What is the difference between MR212D-1010 and MR212D-1-1/4?
They are technically identical units. The different nomenclature often refers to the same 1 1/4" NPT negative pressure modulating valve within different distributor catalogs.

Can this valve be used for positive pressure burners?
This specific model is engineered exclusively for negative pressure (pull-through) applications. Using it in a positive pressure system may result in incorrect flow regulation and unsafe operating conditions.

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Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.