![]() Switches are simple devices that open and close due to an action, that action could be as simple as manually opening or closing the switch or can be a little more complicated, like switching in an automated process. A power supply could come from batteries, a transformer or a main electrical panel in a home or building. Hint, a load is like a motor or a compressor, but we'll touch on that later. If the source is below or above the nameplate rating, the load will not perform correctly, or it can cause damage or failure to the load itself. For instance, if the load is rated for 208 VAC, then the power supply serving that load must match or be within its limits. The nameplate on the load will specify the information. The power supply is the power source that feeds the circuit the loads within a circuit are rated for a certain voltage, amperage, etc. Let's focus our attention on the main parts of a basic wiring diagram. ![]() This is my first ever podcast episode, and it was on basic electrical forgive me as I was learning the podcast ropes. If you can understand HVAC wiring diagrams and understand them well, you can take your troubleshooting to the next level. They also contain legends to easily identify the parts within the drawing. If we break it down to the most basic level, wiring diagrams are made up of images that tell a story that story includes things like order of operation as it pertains to flow of power, images of parts like fans, relays and compressors, power source, and all the interconnecting parts and wiring to complete them. I hope that analogy hits home with you because that's exactly how I felt, and if you're currently learning wiring diagrams, I've been there and have felt your frustration. This was sometimes confusing, as each manufacturer's rendition was like a different dialect or accent of the same language. Not only were they a different form of communication, but every HVAC equipment manufacturer had their own way of drawing them out. When I started in the HVAC trade, HVAC wiring diagrams looked like a different language to me because they were. Gary McCreadie is an HVAC tech, the creator of and the HVAC Know It All Podcast
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