Description
The McDonnell & Miller 157S-RBP-MD (Part Number 176503) is a heavy-duty combination low water cut-off and pump controller engineered for reliable boiler protection and pump management in steam and hot water heating systems. Designed with advanced conductance-based sensing technology, this unit delivers precise water level detection and automatic pump control in a single, integrated package — reducing installation complexity and improving system reliability.
Key Features
- Combination low water cut-off and pump controller in one unit
- Snap acting SPDT (Single-Pole, Double-Throw) switch for positive, reliable switching action
- Maximum differential operation for optimized pump cycling and water level control
- Alternate tappings for flexible installation and piping configurations
- 2 integral conductance probes for accurate, dependable water level sensing
- RBP (Remote Blow-down Probe) design for easy maintenance and system servicing
- MD (Maximum Differential) configuration for extended pump run cycles
Product Benefits
- Protects boilers from low water damage by cutting off burner operation when water drops below safe levels
- Automates pump operation to maintain proper water levels without manual intervention
- Conductance probe technology eliminates mechanical float components, reducing wear and maintenance
- Alternate tappings provide installation versatility for a wide range of boiler configurations
- Snap acting switch ensures fast, decisive response to changing water level conditions
Applications
- Steam boiler low water protection
- Hot water boiler pump control
- Commercial and industrial hydronic heating systems
- Boiler rooms requiring combined cut-off and pump management in a single device
Product Details
- Brand: McDonnell & Miller (Xylem)
- Model: 157S-RBP-MD
- Part Number: 176503
- Switch Type: Snap Acting SPDT
- Operation: Maximum Differential
- Tappings: Alternate
- Probes: 2 Integral Conductance Probes
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