Hydrolevel 550SVR Low Water Cut-Off 320720-756 you can use the terminals

you can use the terminals that close on a temperature rise to activate exhaust fans or cooling equipment when the setpoint is exceeded

this voltage-sensing switch features a 5% low-heat input calibration

and high-tensile springs

making it a reliable drop-in solution for R-22 systems

Hydrolevel 550SVR Low Water Cut-Off 320720-756 you can use the terminalsThe Hydrolevel 550SVR Low Water Cut Off is a professional grade safety control designed to prevent dry firing in 120Vac gas or oil fired boilers. This Safgard 550SVR LWCO features a 30 second delay to filter out nuisance shutdowns from temporary water surges, ensuring the burner circuit only locks out during sustained low water events. As a secondary control for steam boilers or a primary limit for hot water systems, it meets ASME CSD 1 requirements