Hydrolevel 550 Low Water Cut-Off 30067439-890 17-6" WC adjustment range to

17-6" WC adjustment range to accommodate various duct pressures and blower configurations

Designed to manage the sequential starting process—including pre-purge

Can this crank arm be used with pneumatic actuators

Unused primary wires should be safely capped with wire nuts or heat-shrink tubing to prevent accidental shorting or contact with the equipment chassis

Hydrolevel 550 Low Water Cut-Off 30067439-890 17-6" WC adjustment range toThe Hydrolevel 550 Low Water Cut Off is a heavy duty 120V electronic safety control designed for critical protection in hot water boiler systems. This unit serves as a direct replacement for PSE 801 M 120 and Slant Fin 432 554 000, ensuring seamless field integration for service contractors. Engineered to prevent dry firing, the Hydrolevel 550 utilizes the EL1214 sensing probe to monitor water levels via conductivity. The manual reset functionality,