Description
Xylem-McDonnell & Miller FS4-3D General Purpose Liquid Flow Switch
The Xylem-McDonnell & Miller FS4-3D is a dependable, general purpose liquid flow switch engineered for a wide range of hydronic and fluid system applications. Featuring a 1″ NPT connection and a dual 2-SPDT switching configuration, this flow switch provides reliable flow detection and system protection in commercial and industrial HVAC, boiler, and process piping systems. Rated for up to 160 PSI maximum pressure, the FS4-3D is built to handle demanding liquid service environments with confidence.
Versatile Paddle Selection
The FS4-3D ships complete with four stainless steel paddle options, allowing the technician to match the switch to the pipe size and flow conditions on site. The included paddle set covers a broad range of pipe diameters for maximum installation flexibility.
- 1″ stainless steel paddle
- 2″ stainless steel paddle
- 3″ stainless steel paddle
- 6″ stainless steel paddle
Key Features & Specifications
- Brand: Xylem-McDonnell & Miller
- Part Number: 114550
- Model: FS4-3D
- Connection Size: 1″ NPT
- Switch Type: 2-SPDT (Double Pole Double Throw)
- Maximum Working Pressure: 160 PSI
- Application: General purpose liquid flow detection
- Paddle Material: Stainless Steel
- Included Paddles: 1″, 2″, 3″, and 6″
Typical Applications
- Hydronic heating and cooling systems
- Boiler flow protection and interlock circuits
- Chilled water and condenser water systems
- Commercial and industrial process piping
- Pump proof-of-flow verification
Why Choose the FS4-3D?
McDonnell & Miller, a trusted Xylem brand, has been manufacturing flow and level controls for over a century. The FS4-3D continues that tradition with a rugged, field-proven design that installs quickly and delivers long-term reliability. The dual 2-SPDT switch configuration provides flexible wiring options for both alarm and control circuits, making it an ideal choice for equipment protection, pump interlock, and flow verification in a variety of liquid systems.
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