Antunes Controls 803112503 Pressure Switch

The Antunes Controls 803112503 (Model LGP-A) is a heavy-duty manual reset low gas pressure switch engineered for critical safety monitoring in industrial and commercial burner systems. This SPDT pressure switch is designed to break the electrical circuit when gas pressure drops below the calibrated setpoint, which is adjustable from 6" to 24" w.c.. It features a rugged die-cast aluminum housing and 1/4" NPT inlet connections, alongside a 1/8" NPT vent port for standard piping requirements. Built for precision in HVAC gas train assemblies, the LGP-A ensures that gas-fired equipment operates within safe pressure parameters, preventing flame instability or incomplete combustion. Its manual reset mechanism requires technician intervention following a low-pressure event, providing a necessary layer of diagnostic oversight for commercial boiler controls and furnace safety strings. This unit is compatible with natural gas, propane, and air, making it a versatile component for industrial burner safety applications.

• Adjustable Setpoint: Field-adjustable range of 6" to 24" w.c. allows for precise calibration to specific appliance requirements.
• Manual Reset Security: Ensures the system cannot restart until a qualified technician inspects the pressure drop cause.
• Durable Construction: High-quality internal diaphragm and die-cast aluminum body withstand demanding mechanical room environments.
• Standardized Plumbing: Features a 1/4" NPT connection and 1/8" NPT vent for seamless integration into existing gas trains.
• Reliable Switching: SPDT electrical configuration allows for both load breaking and alarm signaling.

How do I wire the Antunes LGP-A for a lockout circuit?
Using the SPDT contacts, connect the common and normally closed terminals in series with your gas valve's limit string. When pressure falls below the 6-24" w.c. setpoint, the circuit opens, necessitating a manual reset.

What is the maximum surge pressure for the 803112503?
The LGP-A series is typically rated for a maximum surge pressure of 15 psi. Exceeding this can damage the internal sensing diaphragm and affect calibration accuracy.

Can this switch be mounted in any orientation?
For maximum accuracy and to maintain the calibrated setpoint, it is recommended to mount the switch with the diaphragm in a vertical position.

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.