Published at Monday, March 25th, 2019 - 20:50:24 PM. wiring. By Odette Bertin.
In the example shown, line 5 has the numbers 5 and 11 printed to the right of the line. This means that the load (HR) controls a set of contacts in lines 5 and 11. The contact in line 5 is normally open and the contact in line 11 is normally closed. Many times there are also small numbers printed next to each of the electrical components on the diagram. In our example, we have colored these numbers blue. These smaller numbers represent the manufacturer’s numbers stamped on the actual electrical component. For example, the compressor overload OL2 has the numbers 3 and 4 printed next to it. This means that the wiring shown on the diagram will be physically connected to terminals 3 and 4 on the actual overload. This allows a technician to more easily locate an exact point in the wiring of the system. Lastly, some diagrams will also have a circled number shown next to a line on the diagram. These circled numbers are used to identify the actual wires used on the system.
Technical Training Associates added a new title to its HVACR Troubleshooting series: ”HVACR Troubleshooting Fundamentals: Electricity & Wiring Diagrams Student & Instructor Package.” This HVACR electrical training package includes a 420-page spiral bound training manual, an accompanying instructor guide, and PowerPoint supplement. The book is clearly written and easy to understand, providing a basic foundation for learning how to use wiring diagrams and test equipment to troubleshoot HVACR electrical systems.
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