Electric load for other purposes including a heater or electric heating elements. In the refrigeration equipment are distinguished two types of heater, the heater deforst and mullion heater. Defrost heater placed on the evaporator, used to melt the frost that arise on the surface of the evaporator, mullion heater was placed around the door refrigerator / freezer to prevent non-condensing order tool. Other electrical loads are lighting and sign lighting.
Table 2.1 shows the various symbols of the electrical load. Table 2.1 List of Symbols Electricity for various types of electrical loads
Figure 2.4 Typical Defrost Heater installed in Evaporator
Besides using standard symbols, some manufacturers of refrigeration and HVAC often complement electrical diagrams with abbreviations to facilitate the reader to understand the diagram disajikannnya.Tabel 2.2 shows some abbreviations commonly used in refrigeration and ventilation industries.
Table 2.2 Abbreviations and electrical load control devices
