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

The Maxitrol 325-5-3/4-12A39 is a high-performance lever acting design gas regulator engineered for sophisticated pounds-to-inches pressure reduction in residential, commercial, and light industrial systems. Designed with a 3/4" NPT connection, this regulator handles a maximum inlet pressure of 5 PSI for natural gas and 2 PSI for LP applications, adjusting down to a precise 4-12" wc outlet pressure. The integrated positive dead-end lock-up ensures zero pressure creep during periods of no demand, protecting downstream equipment like boilers and unit heaters. With a massive 325,000 BTU/hr capacity, it maintains accurate control from full flow down to pilot stages. This model features a factory-installed 12A39 vent limiter, eliminating the need for external vent piping in indoor installations, provided the regulator is mounted in an upright position. Built with a rugged aluminum housing, it operates reliably across extreme temperatures from -40 to 205°F.

Key Benefits for Contractors

• Internal Vent Limiting: The included 12A39 vent limiter ensures safe indoor operation by restricting gas escapement without requiring a dedicated vent line to the atmosphere.
• Dead-End Lock-Up: Features a high-leverage valve linkage that provides a mechanical advantage to seal the valve tight, preventing over-pressurization of downstream components.
• High Volume Capacity: Rated for up to 325,000 BTU/hr, making it suitable for high-demand gas appliance pressure regulator applications.
• Fuel Versatility: Fully compatible with natural gas, manufactured, mixed gases, and liquefied petroleum (LP) gas-air mixtures.
• Multi-Position Capability: Can be installed in various orientations, though specific upright mounting is required when using the vent limiting device for proper operation.

Common Questions

Can the Maxitrol 325-5 be used for outdoor installations?
Yes, the aluminum construction is durable for outdoor use. However, if using the 12A39 vent limiter, it must be protected from weather or replaced with a vent protector to prevent water and debris from entering the atmospheric side of the diaphragm.

What is the purpose of the 4-12" wc spring range?
This outlet pressure range allows technicians to fine-tune the delivery pressure to match the specific requirements of the appliance manifold, ensuring optimal combustion efficiency.

Does this regulator require a separate vent line?
Because this model includes the integrated vent limiter, a separate vent line to the outdoors is generally not required for indoor installations under most local codes, simplifying the gas regulator installation process.

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.