Maxitrol SR600-3/4 Regulator

The Maxitrol SR600-3/4 is a specialized two-stage gas regulator designed for high-performance modulating burner systems. Engineered with a 3/4" NPT connection, this unit manages a maximum inlet pressure of 1/2 PSI (CSA certified) and up to 1 PSI based on Maxitrol's internal testing protocols. This regulator is essential for maintaining precise manifold pressure during varied firing rates, featuring a low fire adjustment range of 0.2" w.c. to 1.2" w.c. and a high fire capacity reaching up to 6" w.c. Built for industrial gas pressure regulation, the SR600 series utilizes a high-leverage valve linkage to ensure consistent lock-up and sensitivity under fluctuating load conditions. Technicians often specify this model for commercial boiler gas valves and atmospheric burner manifolds where dual-stage firing is required for optimal combustion efficiency. Its rugged construction ensures reliable HVAC manifold pressure control while meeting rigorous safety standards for gas-fired equipment installations.

• Dual-Stage Modulation: Enables seamless transitions between low and high fire settings for improved thermal efficiency.
• Precise Low Fire Control: Adjustable down to 0.2" w.c., facilitating stable ignition and minimal cycling in modulating systems.
• High Leverage Design: Features a superior linkage system for improved seat positioning and drop-out prevention.
• Flexible Installation: Compact 3/4" NPT footprint allows for straightforward integration into existing gas trains and manifold assemblies.
• Tested Durability: Rated for up to 1 PSI inlet pressure, providing a margin of safety for varied gas service environments.

How do you adjust the low fire setting on the Maxitrol SR600-3/4?
The low fire setting is adjusted via the specific adjustment screw located under the stack cap. It is critical to use a calibrated manometer to set the 0.2" to 1.2" w.c. range before proceeding to high fire calibration.

Can this regulator handle outdoor installations?
The SR600 is designed for indoor use unless equipped with appropriate vent protection or installed in a NEMA-rated enclosure to prevent moisture and debris from fouling the vent breather.

Is a vent limiter required for this 3/4" NPT gas regulator?
Local codes typically dictate venting requirements. While some Maxitrol gas regulators can use vent limiters for indoor applications, always verify if the specific BTU load and local jurisdiction allow for vent-less installation.

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.