Maxitrol M520B-3/4 Gas Valve
The Maxitrol M520B-3/4 is a specialized 3/4" NPT Modulating Gas Valve engineered for technical precision in negative pressure (pull-through) and indirect fired atmospheric burner applications. As a core component of the Selectra electronic gas flame modulating system, this valve provides instantaneous, non-fluctuating temperature control without the need for mechanical butterfly valves or motors. Built with a corrosion-resistant brass valve body and a resilient elastomeric diaphragm, it manages a maximum inlet pressure of 1/2 PSI (14" w.c.). This specific "B" variant is unique because it features dual-side low fire adjustment, allowing technicians to fine-tune the minimum firing rate from either side of the manifold—critical for tight installations in makeup air or space heating units. By utilizing a internal counter-spring, the valve remains securely closed against downward atmospheric pull until the Selectra amplifier applies the necessary DC voltage to move the plunger, ensuring a seamless linear relationship between control signal and gas flow for superior thermal stability.
Key Benefits for HVACR Contractors:- Precision Thermal Control: Delivers infinite flame adjustment to maintain consistent discharge air temperatures in process heating and stabilized area heating.
- Field Serviceability: Features bypass adjustment on both sides, simplifying low flow manifold pressure settings in complex rooftop or cabinet configurations.
- System Compatibility: Designed for seamless integration with Maxitrol A1094 and AD1094 amplifiers or SC11 signal conditioners.
- Industrial-Grade Build: Stamped steel and brass construction ensures a reliable seal and long-term performance under 30 PSI static pressure conditions.
- Can this valve be used in positive pressure systems? No, the M520 series is specifically designed for negative pressure applications; for positive pressure burners, use the MR series regulators.
- What is the maximum manifold pressure setting? While the inlet handles 1/2 PSI, the high fire condition is typically limited by the pressure regulator to a controlled maximum, often reaching up to 7.0" w.c. depending on the system design.
- How do I adjust the minimum firing rate? Use the bypass screw on either side of the valve body to set the low flow rate while the safety shut-off valve is open and the control is at zero voltage.
This item is not eligible for free shipping.
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.
Maxitrol M520B-3/4 Gas Valve
The Maxitrol M520B-3/4 is a specialized 3/4" NPT Modulating Gas Valve engineered for technical precision in negative pressure (pull-through) and indirect fired atmospheric burner applications. As a core component of the Selectra electronic gas flame modulating system, this valve provides instantaneous, non-fluctuating temperature control without the need for mechanical butterfly valves or motors. Built with a corrosion-resistant brass valve body and a resilient elastomeric diaphragm, it manages a maximum inlet pressure of 1/2 PSI (14" w.c.). This specific "B" variant is unique because it features dual-side low fire adjustment, allowing technicians to fine-tune the minimum firing rate from either side of the manifold—critical for tight installations in makeup air or space heating units. By utilizing a internal counter-spring, the valve remains securely closed against downward atmospheric pull until the Selectra amplifier applies the necessary DC voltage to move the plunger, ensuring a seamless linear relationship between control signal and gas flow for superior thermal stability.
Key Benefits for HVACR Contractors:- Precision Thermal Control: Delivers infinite flame adjustment to maintain consistent discharge air temperatures in process heating and stabilized area heating.
- Field Serviceability: Features bypass adjustment on both sides, simplifying low flow manifold pressure settings in complex rooftop or cabinet configurations.
- System Compatibility: Designed for seamless integration with Maxitrol A1094 and AD1094 amplifiers or SC11 signal conditioners.
- Industrial-Grade Build: Stamped steel and brass construction ensures a reliable seal and long-term performance under 30 PSI static pressure conditions.
- Can this valve be used in positive pressure systems? No, the M520 series is specifically designed for negative pressure applications; for positive pressure burners, use the MR series regulators.
- What is the maximum manifold pressure setting? While the inlet handles 1/2 PSI, the high fire condition is typically limited by the pressure regulator to a controlled maximum, often reaching up to 7.0" w.c. depending on the system design.
- How do I adjust the minimum firing rate? Use the bypass screw on either side of the valve body to set the low flow rate while the safety shut-off valve is open and the control is at zero voltage.
This item is not eligible for free shipping.
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.
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Description
The Maxitrol M520B-3/4 is a specialized 3/4" NPT Modulating Gas Valve engineered for technical precision in negative pressure (pull-through) and indirect fired atmospheric burner applications. As a core component of the Selectra electronic gas flame modulating system, this valve provides instantaneous, non-fluctuating temperature control without the need for mechanical butterfly valves or motors. Built with a corrosion-resistant brass valve body and a resilient elastomeric diaphragm, it manages a maximum inlet pressure of 1/2 PSI (14" w.c.). This specific "B" variant is unique because it features dual-side low fire adjustment, allowing technicians to fine-tune the minimum firing rate from either side of the manifold—critical for tight installations in makeup air or space heating units. By utilizing a internal counter-spring, the valve remains securely closed against downward atmospheric pull until the Selectra amplifier applies the necessary DC voltage to move the plunger, ensuring a seamless linear relationship between control signal and gas flow for superior thermal stability.
Key Benefits for HVACR Contractors:- Precision Thermal Control: Delivers infinite flame adjustment to maintain consistent discharge air temperatures in process heating and stabilized area heating.
- Field Serviceability: Features bypass adjustment on both sides, simplifying low flow manifold pressure settings in complex rooftop or cabinet configurations.
- System Compatibility: Designed for seamless integration with Maxitrol A1094 and AD1094 amplifiers or SC11 signal conditioners.
- Industrial-Grade Build: Stamped steel and brass construction ensures a reliable seal and long-term performance under 30 PSI static pressure conditions.
- Can this valve be used in positive pressure systems? No, the M520 series is specifically designed for negative pressure applications; for positive pressure burners, use the MR series regulators.
- What is the maximum manifold pressure setting? While the inlet handles 1/2 PSI, the high fire condition is typically limited by the pressure regulator to a controlled maximum, often reaching up to 7.0" w.c. depending on the system design.
- How do I adjust the minimum firing rate? Use the bypass screw on either side of the valve body to set the low flow rate while the safety shut-off valve is open and the control is at zero voltage.
This item is not eligible for free shipping.
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.
