Hydrolevel 550SVR Low Water Cut-Off with Manual Reset, Test Button, LED Light, Remote Probe - 120V

The Hydrolevel 550SVR Safgard is a commercial-grade low water cut-off (LWCO) designed for gas or oil-fired hot water boilers and secondary protection on steam boilers. This electronically operated safety control features manual reset, an integrated test button, LED indicator light, and an EL1214-R remote mounting probe for flexible installation options.

How It Works:

The 550SVR uses water as a conductor to complete an electrical circuit between the sensing probe and boiler shell. When water contacts the probe, the circuit is complete and the boiler operates normally. If water drops below the probe level, the circuit opens and power to the burner is immediately interrupted. The burner circuit locks out if water remains below the probe for 30 seconds, requiring manual reset after the low water condition is corrected.

Key Features:

• 120V operation with 4 VA power consumption
• Manual reset function with 30-second lockout delay
• Integrated test button to verify control operation without lowering water level
• LED indicator light for status monitoring
• EL1214-R remote mounting probe for flexible installation
• SPDT switch contacts: 5.8 FLA, 34.8 LRA switching capacity
• Maximum pressure rating: 160 PSI for hot water applications
• Will not trip due to power failures
• UL Listed and CSA Certified

Applications:

Ideal for commercial hot water boiler installations requiring reliable low water protection with remote probe mounting capability. Can also serve as a secondary low water cut-off on steam boilers when used in conjunction with a primary LWCO. The remote probe configuration allows the control box to be mounted separately from the boiler connection point for easier access and maintenance.

Maintenance:

Inspect and clean the probe annually using a scouring pad or steel wool to remove any scale or mineral buildup. Test control operation after reinstalling the probe to ensure proper function.