Description
Product Overview
The Xylem–McDonnell & Miller 369-MV is a dependable, auto-reset mechanical low water cut off engineered specifically for steam boilers. Featuring a millivolt switch and a robust mechanical float mechanism, this control safeguards your boiler by shutting off the burner whenever water drops below a safe operating level — then automatically resets once proper water level is restored. Ideal for residential and light commercial steam heating systems.
Key Specifications
- Connection Size: 2-1/2″ NPT
- Insertion Length: 1-3/4″
- Maximum Steam Pressure: 20 PSI
- Switch Type: Millivolt Switch
- Reset Type: Automatic (Auto Reset)
- Part Number: 155400
- SKU: 369-MV
Features & Benefits
- Mechanical float-operated design provides reliable, proven low water protection
- Auto reset functionality eliminates the need for manual intervention after water level is restored
- Millivolt switch makes this control compatible with millivolt heating systems and standing pilot appliances
- 2-1/2″ NPT connection ensures straightforward installation on standard steam boiler tappings
- 20 PSI maximum steam pressure rating suits residential and light commercial steam boiler applications
- Compact 1-3/4″ insertion length minimizes intrusion into the boiler vessel
- Trusted Xylem–McDonnell & Miller quality, backed by decades of hydronic and steam controls expertise
Application
The 369-MV is designed for use on steam boilers where millivolt-based burner control systems are employed. It mounts directly to the boiler via a 2-1/2″ NPT tapping and continuously monitors water level. Should the water level fall below the safe threshold, the millivolt switch opens the circuit, cutting off the burner to prevent dry-fire damage. Once water level is re-established, the control automatically resets — providing hands-free boiler protection.
Installation Notes
- Install on the side of the boiler at the proper low water level tapping
- Ensure system steam pressure does not exceed 20 PSI maximum rating
- Compatible with millivolt burner control circuits
- Refer to manufacturer installation instructions for proper wiring and mounting procedures
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