The Johnson Controls P78LCA-13000C Pressure Controller is a pressure-sensing control designed for compatible HVAC and refrigeration systems. It monitors system pressure and responds to changes by opening or closing an electrical circuit at a preset pressure level, helping regulate equipment operation and protect components. Commonly used in air conditioning units, refrigeration system... https://www.partshnc.com/p78lca-13000c-johnson-controls-pressure-controller