The Johnson Controls F261KFH-V01C Flow Switch is a high-precision, inline low-flow switch designed for heavy-duty HVACR and industrial liquid monitoring. Featuring 3/4" FNPT inlet and outlet connections, this unit acts as a direct replacement for the F61KD-4 and F61KD-4C models. Built with a rugged NEMA 3R enclosure to protect against rain and ice formation, it is suitable for both indoor and outdoor liquid lines carrying water, ethylene glycol, or lubricating oils. The internal SPDT (Single-Pole, Double-Throw) switch mechanism is rated for up to 1 hp at 120/240 VAC, allowing for direct control of compressors or alarm circuits upon detecting a flow drop. This paddle flow switch is optimized for low-velocity environments, actuating at flow rates as low as 0.6 GPM and handling a maximum flow of 17 GPM. The Viton diaphragm ensures long-term chemical compatibility with treated or chlorinated water, making it an ideal choice for swimming pool and purification equipment. With a maximum fluid pressure rating of 290 psig and a media temperature range of -20°F to 250°F, the F261KFH-V01C provides reliable mechanical flow detection in challenging process conditions. This model also features gold-plated contacts to ensure electrical continuity in low-voltage dry circuits, preventing signal degradation in control-level logic applications. Key Benefits Broad Compatibility: Direct replacement for the Johnson Controls F61KD-4 legacy series. Multi-Fluid Support: Verified for use with water, brine, ethylene glycol, and non-hazardous lubricating oils. Precision Low-Flow Detection: Actuates at a minimum 0.6 GPM, providing essential protection for low-volume chillers and booster pumps. NEMA 3R Protection: Weather-resistant housing allows for outdoor installation and protects against condensation. High-Pressure Tolerance: Safely operates in pressurized systems up to 290 psi without compromising the internal bellows or diaphragm. Common Questions Can the F261KFH-V01C be used for steam applications? While the F261 series has specific models for steam, the F261KFH-V01C is primarily rated for liquids. Contractors requiring a switch specifically for steam should verify the specific flow requirements (typically 9.0 GPM minimum for steam) or consider the F261KFH-V02C variant. What is the difference between this and the NEMA 4 models? The F261KFH-V01C features a NEMA 3R enclosure, which is designed for weather resistance against rain and snow. NEMA 4 models (such as the F261MFH series) provide a higher level of protection against dust and high-pressure water washdowns, typically for high-humidity or industrial cleaning environments. Is this switch suitable for potable water lines? No. Because this device contains copper alloys with lead content, it is not intended for use in drinking water systems. Use it exclusively for HVAC, irrigation, or industrial process fluid monitoring. 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.
