Maxitrol 325-5L-3/4-12A39 Regulator

The Maxitrol 325-5L-3/4-12A39 is a high-performance 3/4" line pressure regulator engineered for residential and commercial systems requiring precise natural gas pressure regulation. This lever-acting model is designed to handle a maximum inlet pressure of 2 PSI while providing a stable outlet range of 7-11 inches water column. With its positive dead-end lock-up capability and factory-installed 12A39 vent limiter, this unit ensures safety by preventing downstream overpressure and eliminates the need for external vent piping when installed in accordance with local codes. For high-demand applications, it supports a maximum individual load of 425,000 BTU/hr and a combined multiple load capacity of 600,000 BTU/hr. This regulator is a critical component for maintaining consistent manifold pressure in HVAC equipment, commercial water heaters, and industrial boilers, ensuring optimal combustion and efficiency across varying load conditions.

Key Technical Benefits

• Precise Pressure Control: Lever-acting design provides superior regulation sensitivity and low-flow stability.
• Enhanced Safety Compliance: Certified for ANSI Z21.80/CSA 6.22 standards for line pressure regulators.
• Simplified Installation: Integrated 12A39 vent limiter allows for indoor mounting without running vent lines to the outdoors.
• High Capacity Throughput: Robust 600,000 BTU/hr aggregate capacity manages multi-appliance configurations with a single drop.
• Reliable Lock-Up: Positive dead-end lock-up prevents pressure creep during off-cycles, protecting downstream valves.

Common Contractor Questions

Can the 325-5L-3/4 be mounted in any orientation?
While the regulator can be installed in several positions, it must be mounted horizontally for the vent limiter to function correctly. Always check manufacturer mounting specifications to maintain compliance.

What is the purpose of the 12A39 vent limiter in this model?
The 12A39 vent limiter acts as a safety device that restricts gas leakage in the event of a diaphragm rupture, meeting safety standards for ventless installation in specific HVAC and appliance applications.

Is this regulator compatible with Propane (LP)?
This specific configuration is set for 7-11" WC, typically used for natural gas. While Maxitrol 325 series bodies can handle LP, proper spring selection and calibration are required for high-pressure LP applications.

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.