Mcdonnell Miller 115600 High Sensitivity Flow Switch 100 Psi

Product Description

The MCDONNELL MILLER 115600 is a high sensitivity flow switch designed to detect liquid flow in hydronic cooling and water treatment piping systems. It features a brass housing rated to 100 psi and covers a flow detection range of 0.12 to 2.5 GPM with a set point of 2.5 GPM. The threaded NPT connection makes it straightforward to install inline without special fittings. At 5 inches in overall length and 4.5 pounds, it is a compact, durable unit suited for commercial and light industrial applications. HVAC technicians and plumbers install this switch to provide flow proving signals that protect equipment from running dry or without adequate flow.

The 115600 is rated for use in cooling systems and water treatment systems where liquid flow monitoring is required. Its high sensitivity design is well suited for low-flow applications where standard paddle-type switches may not reliably actuate. The NEMA 1 enclosure rating makes it appropriate for indoor installations in mechanical rooms, equipment rooms, and similar clean, dry environments. It is compatible with liquid media and is commonly installed on chilled water circuits, condenser water lines, and water treatment feed lines.

Key Features

• High sensitivity detection range of 0.12 to 2.5 GPM covers low-flow applications where standard switches fall short
• Brass housing withstands 100 psi operating pressure
• Threaded NPT connection for standard inline piping installation
• 5 inches overall length fits in tight mechanical spaces
• NEMA 1 enclosure for indoor mechanical room use
• Suitable for cooling systems and water treatment system applications

Compatibility

Designed for use with liquid media in cooling systems and water treatment systems. Intended for inline piping installations using standard NPT threaded fittings.

Installation Notes

Installation should be performed by a licensed plumber or qualified HVAC technician in accordance with applicable local plumbing codes. Shut off system pressure and fully drain the affected piping section before cutting in the switch. Use thread sealant rated for the system fluid on all NPT connections and verify no leaks before restoring pressure. The NEMA 1 rating limits installation to dry, indoor locations only — do not install in wet or outdoor environments.