Hydrolevel CG400-2090 Low Water Cut-Off

The Hydrolevel CG400-2090 is a 24Vac steam primary low water cut-off designed for high-performance monitoring in residential and light commercial gas-fired boilers. As the direct replacement for CG400-1090 and legacy 400 models, this unit utilizes an EL1214 sensing probe to detect water levels without the mechanical failure risks associated with float-style devices. A critical feature for modern high-efficiency systems is the 90-second intermittent level test (ILT) conducted every 20 minutes. This sequence temporarily shuts down the burner to allow foam to dissipate and water to settle, ensuring the control reads the true water level rather than a false signal caused by surging or priming. The integrated 15-second off-delay prevents nuisance burner short cycling during momentary water fluctuations, while the 30-second on-delay ensures a safe water line is established before ignition. This non-cycling control features an automatic reset and is rated for steam pressures up to 15 PSI.

• Enhanced Accuracy: The foam compensating technology protects boilers from dry firing by distinguishing between actual water levels and volatile surface foam.
• Simplified Maintenance: Solid-state design with no moving parts eliminates the need for frequent blowdowns and reduces sediment-related failures.
• Direct Retrofit: Seamlessly replaces older Hydrolevel CG400 and 400 series units using standard 3/4" NPT connections.
• Reliable Switching: Features a robust SPDT relay with a 50 VA switching capacity for consistent burner circuit control.
• Status Alerts: Onboard LED indicators provide immediate visual confirmation of low water conditions and ILT active cycles.

Is this unit compatible with automatic water feeders?
Yes, the CG400-2090 includes dedicated terminals for optional water feeders, such as the Hydrolevel VXT-24, to maintain safe operating levels automatically.

Can I use Teflon tape on the EL1214 probe threads?
It is recommended to avoid excessive use of Teflon tape, as the probe relies on the boiler shell for a ground connection; over-insulating the threads can cause the control to malfunction.

What is the difference between the 2090 and 1090 models?
The 2090 is the current standard, featuring a 20-minute test interval with a 90-second duration, providing more stability for smaller, modern steam boilers compared to the 10-minute cycle of the obsolete 1090.

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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.