Description
The Xylem-McDonnell & Miller 157S-RB-MD is a heavy-duty combination low water cut-off and pump controller engineered to protect steam and hot water boilers from dangerous low-water conditions while simultaneously managing pump operation. Designed for demanding commercial and industrial hydronic applications, this unit integrates reliable protection and control into a single, compact device.
Key Features
- Combination low water cut-off and pump controller in a single unit for simplified installation
- Snap-acting SPDT (Single-Pole Double-Throw) switch for precise, reliable switching action
- Maximum differential operation for broader control range and reduced short-cycling
- Alternate tappings provide flexible piping configurations to suit a variety of boiler installations
- Part Number 176601 for easy cross-referencing and ordering
- Rugged construction built to withstand the rigors of commercial boiler rooms
How It Works
The 157S-RB-MD monitors boiler water levels continuously. When water drops below the safe operating threshold, the snap-acting SPDT switch responds instantly — cutting off the burner to prevent boiler damage and activating the pump controller to restore proper water levels. The maximum differential operation setting ensures the control doesn’t cycle unnecessarily, extending the life of connected equipment.
Application
- Steam boilers in commercial and light industrial settings
- Hot water heating systems requiring low water protection
- Installations requiring flexible tapping configurations
- Replacement or upgrade of existing McDonnell & Miller low water cut-off controls
Why Choose McDonnell & Miller
McDonnell & Miller, a brand under Xylem, has been a trusted name in boiler protection controls for over a century. The 157S-RB-MD continues that legacy with proven float-operated technology, delivering dependable boiler safety and pump management in a single, cost-effective package.
Specifications
- SKU: 157S-RB-MD
- Part Number: 176601
- Switch Type: Snap-Acting SPDT
- Operation: Maximum Differential
- Tappings: Alternate Tappings
- Function: Combination Low Water Cut-Off and Pump Controller
- Brand: Xylem-McDonnell & Miller
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