Description
Xylem-McDonnell & Miller 157S-RL Combination Low Water Cut-Off and Pump Controller
The McDonnell & Miller 157S-RL is a reliable, float-operated combination low water cut-off and pump controller engineered for use on steam boilers. Designed to protect boilers from the hazards of low water conditions, this unit simultaneously controls the feed pump to maintain proper water levels — combining two critical functions into a single, dependable device. The snap-acting SPDT (Single-Pole Double-Throw) switch ensures precise, positive switching action for consistent performance in demanding hydronic and steam heating applications. Alternate tappings provide installation flexibility, allowing the unit to be adapted to a wider range of boiler configurations.
Key Features
- Combination low water cut-off and pump controller in one unit
- Snap-acting SPDT switch for positive, reliable switching action
- Alternate tappings for flexible installation on various boiler types
- Float-operated design for accurate water level sensing
- Protects steam boilers from dangerous low water conditions
- Suitable for steam heating systems requiring automatic pump control
- Part Number: 176902
Application
The 157S-RL is ideal for residential and light commercial steam boiler installations where both low water cut-off protection and automatic pump control are required. Its dual-function design simplifies wiring and reduces installation time, while the alternate tappings allow for straightforward retrofitting on existing boiler systems.
Why Choose McDonnell & Miller
McDonnell & Miller, a brand under Xylem, has been a trusted name in boiler water level controls for over a century. Their low water cut-offs are recognized throughout the HVAC and plumbing industries for durability, precision, and compliance with industry safety standards — making the 157S-RL a go-to choice for contractors and engineers alike.
Reviews
There are no reviews yet.