Description
The Johnson Controls F61FB-1C Flow Switch is a paddle-type flow component used in water systems to detect the presence or absence of liquid movement within piping. It operates by responding to water or glycol flow in clean heating, cooling, and chilled water circuits where it provides a switching signal to confirm circulation or to trigger a shutdown under low-flow conditions in HVAC systems. Installed directly into the pipeline, it is used in chillers, boilers and air-handling systems to protect equipment from overheating or inefficiency by ensuring proper flow through heat exchangers and pumps. Within control systems, it operates as a safety interlock and operational checking component integrated into automated building management sequences.
