Description
The Xylem-McDonnell & Miller FS6-1 (Part Number 115600) is a high-sensitivity, in-line liquid flow switch engineered for dependable flow detection in hydronic heating, cooling, and plumbing systems. Featuring a snap-acting SPDT (Single-Pole, Double-Throw) switch mechanism, the FS6-1 responds quickly to changes in liquid flow, providing reliable on/off control signals to protect pumps, boilers, and other hydronic equipment from low-flow or no-flow conditions.
With a 1″ NPT connection, this flow switch installs directly in-line with the piping, making it a straightforward drop-in solution for new installations and retrofit applications alike. Its high-sensitivity paddle design detects even low flow rates, ensuring accurate and consistent system protection.
Key Features
- High-sensitivity in-line liquid flow detection
- Snap-acting SPDT switch for fast, reliable switching action
- 1″ NPT in-line pipe connection for easy installation
- Compact, direct in-line mounting — no tee or insertion fitting required
- Suitable for hydronic heating and cooling systems, boiler protection, and pump interlock applications
- Part Number: 115600
Typical Applications
- Hydronic boiler low-flow protection
- Circulating pump interlock and proof-of-flow
- Chiller and cooling system flow verification
- Water-source heat pump flow proving
- General liquid flow detection in HVAC and plumbing systems
Product Specifications
- Brand: Xylem-McDonnell & Miller
- Model: FS6-1
- Part Number: 115600
- Connection Size: 1″ NPT
- Mounting Style: In-Line
- Switch Type: Snap-Acting SPDT
- Sensitivity: High
- Media: Liquid
The McDonnell & Miller FS6-1 is a trusted choice among HVAC professionals for its rugged construction and proven performance in demanding hydronic applications. Order today from Jackson Systems for fast shipping and expert support.
