This part of UNI 9511 provides the graphic signs for the equipment and connections to be used in the drawings and diagrams of refrigeration systems. For the graphic signs regarding the distribution of fluids, regulation devices, probes and detectors, indicator and recorder devices, sheaths and sockets for measurement and for the acronyms identifying the nature of the fluids, see UNI 9511/1. For the graphic signs for automatic adjustment, see UNI 9511/3.