Hydrolevel CG400A-2090 CycleGard Low Water Cut-Off 24V Steam Boiler Control

The Hydrolevel CG400A-2090 CycleGard is a 24-volt electronic low water cut-off control designed to protect residential and light commercial steam boilers from hazardous low water conditions. This primary safety control features an advanced Intermittent Level Test (ILT) system that provides superior protection against false signals caused by foaming and volatile water conditions inside the boiler.

Key Features:

• 24V operation with automatic reset functionality
• Intermittent Level Test monitors water level every 20 minutes for 90 seconds
• 15-second burner off delay prevents short cycling from momentary water level fluctuations
• 30-second burner on delay allows automatic water feeder to restore proper level
• Low water indicating light for easy status monitoring
• Direct boiler mounting eliminates the need for frequent blowdowns
• Includes 3/4-inch NPT ceramic probe (EL1214 standard probe)
• Maximum operating pressure: 15 PSI (steam applications)
• Compact dimensions: 5-1/2 x 5-9/16 inches

The CycleGard utilizes a heavy-duty electronic probe with a stainless steel tip that senses water levels without moving parts. When water drops below the probe, burner circuit contacts open after a 15-second delay, shutting down the burner to prevent dangerous dry-fire conditions. The control automatically reactivates the burner circuit 30 seconds after water reaches the probe. Suitable for gas-fired steam boilers and low pressure steam process applications.

Cross-References: McDonnell & Miller PS-802-24, PSE-802-24, PS-800-24. Replaces part numbers CG400-2090 and 411-521-000.