Description
The Xylem-McDonnell & Miller 150S-M (Part Number 172806) is a combination low water cut-off and pump controller engineered to protect steam and hot water boilers from the dangers of low water conditions. Featuring a snap-acting manual reset SPDT (Single-Pole, Double-Throw) switch, this unit provides a positive, reliable response to low water situations — requiring manual intervention before the boiler can be returned to service, adding an extra layer of operational safety.
Product Overview
The 150S-M combines two critical boiler protection functions into a single, compact unit: it monitors water level to cut off the burner when water drops below a safe operating threshold, and simultaneously controls the feed pump to restore proper water levels. The manual reset design ensures that operators must physically inspect and acknowledge a low water event before resuming normal boiler operation, helping prevent equipment damage and unsafe conditions.
Key Features
- Combination low water cut-off and pump controller in one unit
- Snap-acting manual reset SPDT switch for positive, reliable operation
- Manual reset requires operator acknowledgment after a low water event
- Designed for steam and hot water boiler applications
- Float-type sensing mechanism for accurate water level detection
- Compact, integrated design simplifies installation and wiring
- Part Number: 172806
Applications
- Steam boilers in residential, commercial, and light industrial settings
- Hot water heating systems requiring low water protection
- Boiler feed pump control and sequencing
- Replacement or upgrade for existing low water cut-off devices
Why Choose the McDonnell & Miller 150S-M
McDonnell & Miller, a trusted Xylem brand, has been a leading name in boiler protection controls for decades. The 150S-M delivers the reliability and durability that HVAC professionals and building engineers depend on to keep boiler systems operating safely and efficiently. Its dual-function design reduces the number of components needed on the boiler, streamlining installation and long-term maintenance.
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