Description
Overview
The Xylem-McDonnell & Miller 42S (Part Number 129302) is a combination low water cut off and pump controller engineered for reliable protection and control on steam boiler systems. By combining two essential boiler safety functions into a single compact unit, the 42S simplifies installation, reduces piping complexity, and delivers dependable performance in demanding hydronic and steam applications.
Key Features
- Combination low water cut off and pump controller in one unit
- SPST snap action switches for positive, reliable switching
- Designed specifically for steam boiler applications
- Float-operated mechanism for accurate water level sensing
- Compact, integrated design reduces installation time and piping connections
- Durable construction built to withstand the demands of steam system environments
- Part Number: 129302
How It Works
The 42S uses a float-operated mechanism to continuously monitor boiler water level. When the water level drops below the safe operating threshold, the low water cut off function interrupts the burner circuit, protecting the boiler from dangerous dry-fire conditions. Simultaneously, the pump controller function manages the feed pump to maintain proper water levels, ensuring efficient and safe boiler operation.
Application
- Steam boiler systems requiring low water cut off protection
- Applications where combined pump control and low water cut off functionality is desired
- Replacement or upgrade for existing McDonnell & Miller low water controls
Why Choose the McDonnell & Miller 42S
McDonnell & Miller, a trusted Xylem brand, has been a leading manufacturer of boiler controls and safety devices for decades. The 42S continues that tradition of quality, offering installers and building engineers a proven solution for steam boiler water level management and protection. Its snap action SPST switches provide crisp, reliable electrical switching, minimizing contact wear and ensuring long service life.
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