Description
The Johnson Controls P78LCA-15000 Dual Pressure Control P78 Series monitors both high-side and low-side refrigerant pressures to control equipment operation within pressure limits. Installed on the refrigeration circuit, pressure-sensing elements actuate internal electrical contacts as operating pressures rise or fall beyond preset settings. Control signals coordinate with compressors, contactors, and safety circuits to regulate operating sequences throughout HVAC systems. Pressure changes continuously determine switching operations, allowing compressor operation to respond to refrigeration conditions while providing protective control during pressure events.
