Hvac electrical basics pdf1/11/2024 Thermal switches have squiggles, pressure switches have a bell, and float switches have a circle. You can differentiate switch types based on what’s beneath them. However, the components and connection points have the same names and numbers across both diagrams. That’s because the connection diagram shows how the components look within the unit instead of how power gets from one place to another. The contactor’s contacts are shown on separate sides on the schematics, but everything inside the contactor is shown together on the connection diagram. Schematics also have an inverted pyramid to indicate ground. Schematics (ladder diagrams) differ from connection diagrams in that everything is shown between the two legs of power (L1 and L2). In the case of this relatively universal Carrier wiring diagram, the asterisks by the abbreviations indicate that those respective parts may be factory-installed but may also be something that you’ll have to add. The legend also contains nomenclature to help you understand what the abbreviations really mean. Component connections may be circular, and field splices may look a bit like wire nuts (and indicate where YOU will need to make a connection). (Power wiring may be darker or bolder, and control wiring may be lighter.) In other words, solid lines indicate wires that are inside the appliance, and dashed lines indicate connections that you will have to make in the field. In many cases, factory wiring will show up as solid lines and field wiring will show up as dashed lines. Whenever you approach a wiring diagram, look at the whole thing, especially the legend and notes.
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