Hydrolevel 750SV Low Water Cut-Off

The Hydrolevel 750SV Low Water Cut-Off is a professional-grade electronic safety control designed primarily for hot water boilers or as a secondary safety on steam boilers. Operating on a 120Vac circuit, this unit provides immediate burner circuit interruption if water levels drop below the probe. Unlike automatic reset models, the 750SV features a manual reset function that activates after a 30-second delay, ensuring a technician or operator must inspect the system following a low water condition. This specific configuration, part number 45-751, includes the EL1214-SV sensing probe, which features a shorter insertion length (2-1/16") and 3/4" NPT threads—ideal for mounting in standard black tees or applications with limited clearance. With a maximum pressure rating of 160 PSI and SPDT switch contacts (5.8 FLA / 34.8 LRA), this electronic LWCO provides heavy-duty switching capacity and reliable water level detection without the moving parts found in traditional float-style controls.

• Enhanced Safety: The 30-second delay before manual reset prevents rapid cycling and ensures a physical inspection occurs after a low water event.
• Compact Installation: The EL1214-SV short probe allows for direct integration into standard piping tees, making it perfect for tight mechanical rooms.
• Electronic Reliability: Features LED indicating lights for "Power" and "Low Water," utilizing the boiler water as a conductor to eliminate mechanical failure points.
• Power Failure Protection: The manual reset logic is designed so it will not trip or lock out during routine power interruptions.

What is the difference between the 750SV and the 750P models?
The "SV" model uses a short probe (EL1214-SV) for standard tee mounting, while the "P" model typically includes a probe with a longer nut to accommodate boilers with thicker jackets or insulation.

Can this be used on a steam boiler?
Yes, while it is the primary choice for hot water systems, it is frequently utilized as a secondary low water cut-off on steam applications to meet specific commercial codes.

Does this unit require a test button?
This specific model (750SV) focuses on reliable safety lockout and does not include an integrated test button; however, it provides clear LED diagnostics to confirm circuit status.

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.