Description
The Xylem McDonnell & Miller 51-2-M-HD is a combination mechanical water feeder and low water cut off engineered for reliable protection and automatic water management on low pressure steam and hot water boilers. Sold as the head mechanism only (Part Number 135300), this unit features a snap-acting, manual reset SPDT switch that provides a positive, decisive cut off action — minimizing the risk of nuisance trips while ensuring boiler safety under demanding conditions.
Key Features
- Combination mechanical water feeder and low water cut off in a single head assembly
- Designed for low pressure steam and hot water boiler applications
- 35 PSI maximum vessel pressure rating
- Snap-acting manual reset SPDT switch for positive, reliable cut off action
- Manual reset requires deliberate operator action before boiler restart — enhancing safety
- Head mechanism only (Part Number 135300) — compatible with McDonnell & Miller 51-2 series bodies
- Trusted Xylem-McDonnell & Miller quality and engineering
Application
The 51-2-M-HD head mechanism is ideal for replacement or upgrade installations on existing McDonnell & Miller 51-2 series low water cut off bodies. Its manual reset design is particularly well-suited for applications where automatic restart after a low water condition is undesirable, providing an added layer of protection for the boiler and building occupants.
Specifications
- Part Number: 135300
- Model: 51-2-M-HD
- Function: Mechanical Water Feeder and Low Water Cut Off
- Application: Low Pressure Steam and Hot Water Boilers
- Maximum Vessel Pressure: 35 PSI
- Switch Type: Snap-Acting Manual Reset SPDT
- Component: Head Mechanism Only
- Brand: Xylem – McDonnell & Miller
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