Johnson Controls F261MAH-V01C Flow Switch

The Johnson Controls F261MAH-V01C is a contractor-grade liquid flow switch designed for heavy-duty monitoring in HVAC and industrial fluid systems. This SPDT flow switch utilizes a NEMA 4 weather-resistant enclosure, making it suitable for both indoor and outdoor installations where moisture or environmental exposure is a factor. As a direct replacement for the F61LB-1 and F61SB-9100, it offers a significant housing upgrade from plastic IP43 ratings to a robust metal construction. This model handles a broad voltage range from 24V to 240VAC and is compatible with pipe sizes from 1 inch to 6 inches using the included stainless steel paddles. Engineered for liquid flow detection in chillers, boilers, and heat exchangers, it features a Viton diaphragm that allows for safe operation with water, brine, glycol mixtures, and lubricating oils at temperatures up to 250°F and pressures reaching 290 PSI.

Key Benefits for Technicians:

• Broad Replacement Compatibility: Serves as the official successor to legacy models like the F61LB-1 and the plastic-housed F61SB-9100.
• Rugged Environmental Protection: The NEMA 4 (Type 3R) enclosure ensures reliable performance in wash-down environments or outdoor mechanical yards.
• Versatile Media Handling: 1-11 1/2 NPT connection and Viton components support diverse fluids, including treated pool water and sea water.
• Customizable Field Setup: Includes four distinct 304 stainless steel paddles (1", 2", 3", and 6") to match specific pipe diameters and flow velocity requirements.
• Simplified Wiring: Features color-coded terminals and a standard 1/2" NPT conduit connection for fast integration into control circuits.

Common Questions:

What is the difference between the F261MAH and the F61 series?
The F261MAH-V01C provides a superior NEMA 4 metal enclosure compared to the IP43 plastic housing found on many older F61 series models, offering better protection against the elements and physical impact.

Can this switch be used in cooling tower applications?
Yes. Because of its Viton diaphragm and stainless steel internal components, it is highly resistant to the chemicals and corrosive elements often found in cooling tower and brine systems.

Does this model support low-voltage control circuits?
Yes, the SPDT contacts are rated for 24V to 240VAC, allowing it to interface directly with high-voltage pumps or low-voltage building automation systems (BAS).

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.