Hydrolevel 550P Low Water Cut-Off

The Hydrolevel 550P Low Water Cut-Off is a probe-type control engineered for residential and commercial hot water boilers. Operating on 120Vac, this unit integrates a manual reset function that activates after a 30-second delay, preventing burner short-cycling during momentary water level fluctuations. The system includes the EL1214-P sensing probe with a long nut (Part Number 45-553), designed to maintain a reliable conductive path even in applications with high sediment or scale build-up. A built-in test button and LED light allow technicians to verify control operation and troubleshoot probe connectivity without breaking the circuit manually. This Safgard 550P model is essential for protecting heat exchangers from dry-fire conditions, especially in systems where local codes mandate a manual reset lock-out. The heavy-duty SPDT switch configuration ensures seamless integration with standard burner primary controls and zone valves, providing high-torque interruptions when water levels drop below the critical threshold.

• Manual Reset Functionality: Complies with stringent safety codes by requiring a physical reset after low-water detection, ensuring the cause of the fault is investigated.
• EL1214-P Sensing Probe: Features a long nut design for easier installation in deep-well tappings and improved signal reliability.
• Delayed Response: The 30-second delay avoids nuisance shutdowns caused by surging water or air pockets in the system.
• On-Board Diagnostics: The integrated test button and signal light allow for rapid verification of the boiler low water cut-off status.
• Universal 120V Compatibility: Designed to wire directly into most hydronic heating systems and hot water boiler control circuits.

Can the manual reset be bypassed for automatic operation?
No, the 550P is specifically designed as a manual reset device to meet safety requirements. For automatic reset applications, the 500 series should be used instead.

Does the EL1214-P probe require regular cleaning?
Yes, as a probe-type LWCO, the metal sensing element should be inspected annually for scale or mineral deposits to ensure proper conductivity.

Is this unit suitable for steam boiler applications?
While Hydrolevel produces steam-specific controls, the 550P is primarily engineered for hot water (hydronic) boilers to protect against low water conditions.

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.