Honeywell Thermal Solutions FSG L4079A1050 Pressure and Limit Controller

The Pressure and Limit Controller from Honeywell, the FSG L4079A1050, is a differential, diaphragm-operated device designed to protect steam systems by monitoring pressure and triggering a safe shutdown on rising pressure. It's UL approved and built for reliable limit control in demanding environments.

This unit handles an operating range of 10–150 psi with a 225 psi maximum line pressure and a 30 psi differential. It supports steam, air, non-combustible gas or non-corrosive fluid media. The SPST 2-circuit contact configuration offers robust switching, with ratings of 9.8 A full load / 58.8 A locked rotor at 120V and 4.9 A full load / 29.4 A locked rotor at 240V. Connections are 1/4 in female threaded, and mounting options include 1/4 in threaded or surface mount.

• Type: differential pressure controller with diaphragm operation
• Operating range: 10–150 psi; max line pressure 225 psi; differential 30 psi
• Media: steam, air, non-combustible gas or non-corrosive fluid
• Electrical: SPST 2-circuit; UL approved; 120V/240V ratings
• Connections & mounting: 1/4" female threaded; surface mount or threaded mounting
• Safety features: manual reset; break on pressure rise; temperature rating 150°F
• Dimensions: 4-1/2" W × 3-1/2" D × 5" H