Hydrolevel 400R Low Water Cut-Off

The Hydrolevel 400R (Part Number 45-402) is a professional-grade 24VAC low water cut-off designed specifically for steam boiler applications where a remote mounting configuration is required. As a primary safety control, the 400R utilizes a non-cycling design, ensuring the burner circuit remains interrupted until a safe water level is restored. This model includes the EL1214-R sensing probe and a dedicated junction box, providing the flexibility needed for installations where the control box must be positioned away from the boiler tapping.

For technicians managing turbulent steam environments, the 15-second burner off delay is a critical feature. This lag prevents nuisance shutdowns caused by momentary water level fluctuations or surging, which are common during high-demand cycles. Once the EL1214-R probe detects that the water has reached a safe operating level, the automatic reset triggers after a 30-second delay, allowing an optional VXT-24 water feeder sufficient time to stabilize the system. Engineered with electronic LWCO technology, this unit eliminates the mechanical failure points found in traditional float-style controls, such as sediment buildup or float rod binding.

Key Benefits for Contractors:

• Remote Probe Mounting: The included EL1214-R probe and junction box allow for versatile placement in tight mechanical rooms or specific boiler geometries.
• Short-Cycle Prevention: Features a 15-second burner off delay to filter out temporary water level surges, reducing wear on the burner and ignition components.
• Solid-State Reliability: No moving parts to wear out or stick; uses 24V electronic water level sensing to ensure precise hazardous condition detection.
• Automatic Reset Logic: Streamlines system recovery by automatically restoring the burner circuit once safe levels are maintained, with a 30-second lead time for boiler water feeders.
• Simplified Maintenance: Eliminates the need for frequent blowdowns associated with float-chamber controls, saving time during annual service calls.

Common Questions & Technical Support:

Does the 400R support a secondary water feeder?
Yes, the 400R features a dedicated terminal (Terminal A) for easy integration with 24V automatic water feeders like the Hydrolevel VXT-24. The internal timing logic is specifically optimized to work in tandem with these feeders to prevent overfilling.

Can I use this on a hot water boiler?
No, the 400R is a steam primary low water cut-off. For hydronic hot water systems, a model like the Safgard 1100 or 170 should be used to ensure proper manual or automatic reset functionality per local code.

What is the maximum pressure rating?
The Hydrolevel 45-402 is rated for a maximum steam pressure of 15 PSI, making it suitable for residential and light commercial low-pressure steam systems.

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.