Hydrolevel 1100M Low Water Cut-Off

The Hydrolevel 1100M (Part Number 45-1100M) is a compact, 24Vac low water cut-off (LWCO) designed specifically for residential hot water boilers. Engineered for reliable boiler dry fire protection, this probe-type control monitors water levels effectively without the mechanical failures associated with float-style switches. This specific model features a manual reset function that triggers after a 30-second delay, ensuring the technician can investigate the cause of the low water condition before the system resumes operation. For streamlined installation, the unit includes a pre-wired 45-1100M wire harness, making it a direct-fit solution for many modern hydronic systems. The integrated test button and LED indicator light allow for rapid diagnostic verification of the internal relay and probe circuit integrity during routine maintenance or calls for heat.

Key Benefits for Hydronic Systems

• Compact Footprint: Designed to fit into tight boiler jackets where space is a premium.
• Maintenance-Free Probe: Unlike float switches, the solid-state probe has no moving parts to scale up or seize.
• Manual Reset Safety: Prevents short-cycling under low water conditions, requiring manual intervention after a 30-second delay.
• Simplified Wiring: The included wire harness reduces labor time and minimizes field wiring errors.
• Real-Time Diagnostics: High-visibility LED light provides instant status of the residential boiler LWCO performance.

Common Technical Questions

How do you test the Hydrolevel 1100M during a service call?
Depress and hold the test button on the side of the unit. This simulates a low water condition by interrupting the burner circuit; the red light should illuminate, and the burner should shut down immediately to verify boiler safety control operation.

Can the manual reset be bypassed for automatic operation?
No, the manual reset low water cut-off is designed specifically for applications where code or safety preferences require a technician or homeowner to reset the device manually following a low water event.

What is the purpose of the 30-second delay?
The delay prevents nuisance shutdowns caused by momentary water surges or turbulence within the boiler casting, ensuring the 24V low water cut-off only trips when a sustained low water condition transition is detected.

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.