Description
The Xylem-McDonnell & Miller FS5-3/4 (Part Number 114760) is a general-purpose, in-line flow switch engineered for dependable flow detection in hydronic heating, cooling, and water-based systems. Featuring a 3/4″ NPT in-line connection, this switch installs directly into the pipeline for a compact, space-saving footprint — eliminating the need for tee fittings or special housings required by paddle-style alternatives.
At the heart of this flow switch is a snap-acting SPDT (Single-Pole, Double-Throw) switching mechanism, which delivers a clean, positive electrical transition when flow is detected or interrupted. This makes the FS5-3/4 ideal for pump protection, flow proving, and equipment interlock applications where reliable on/off signaling is critical.
Key Features
- 3/4″ NPT in-line pipe connection for straightforward installation
- Snap-acting SPDT switch for positive, reliable electrical switching
- General-purpose design suitable for a wide range of hydronic and water system applications
- Compact in-line body — no tee fitting or paddle insertion required
- Trusted McDonnell & Miller / Xylem engineering and quality construction
- Part Number: 114760
Typical Applications
- Hydronic heating and cooling systems
- Pump flow proving and protection
- Boiler and chiller equipment interlock circuits
- Water-based HVAC system flow monitoring
Why Choose the FS5-3/4?
McDonnell & Miller, a brand under the Xylem family, has been a trusted name in flow and level controls for decades. The FS5-3/4 continues that legacy with a straightforward, robust design that minimizes installation complexity while maximizing system reliability. Whether you’re protecting a circulator pump or proving flow to a boiler control, this switch delivers the dependable performance that HVAC professionals expect.
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