Maxon 300CMA11AA11BB22A0 Gas Valve

The Maxon 300CMA11AA11BB22A0 is a heavy-duty, 3-inch electromechanical gas shut-off valve designed for high-capacity industrial burner systems. Engineered with a rugged cast iron body and ANSI threaded connections, this 2-way normally closed valve features a CP port flow capacity for precise fuel control. Operating on 115Vac 60Hz for both the solenoid and motor, it provides a 6 second motor timing for controlled opening and an auto-reset function for fail-safe shutdowns. This model is the direct replacement for the 300CMA11AA11BB21A0, upgraded with VOS2/VCS2 switch options to provide additional visual and electrical proof of closure. Utilizing Buna body O-rings and Internal Trim Package 1, it maintains a gas-tight seal in demanding thermal environments. The NEMA 4 enclosure rating ensures reliable performance in outdoor or wash-down conditions, making it a standard for contractors managing large-scale furnace and boiler applications.

• VOS2/VCS2 Auxiliary Switches: Provides enhanced signaling for system logic, offering advanced proof of position beyond the base model requirements.
• CP Port Design: Optimized flow capacity reduces pressure drop across the valve, ensuring consistent delivery to the burner manifold.
• NEMA 4 Protection: The weather-proof housing protects internal electrical components from moisture and dust infiltration.
• Robust Cast Iron Construction: Built to withstand the physical stresses of industrial piping vibratory loads and high-cycle operation.

Is the 300CMA11AA11BB22A0 used for natural gas or propane?
This general-purpose valve is compatible with natural gas, propane, and air; ensure the Buna O-rings align with your specific fuel chemistry and temperature range.

How does this differ from the 300CMA11AA11BB21A0?
This unit is a functional direct replacement but includes two additional auxiliary switches (VOS2/VCS2) for more complex safety interlock configurations.

Can this valve be mounted in any orientation?
Standard HVACR protocol for Maxon Series 8000/3000 valves requires specific actuator positioning—typically upright—to ensure the 6-second motor timing and auto-reset function operate reliably.

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.