Theory and troubleshooting using short modules packed with images to make learning quick and easy.
Wiring diagrams are used as a map to find your way through the electrical circuit. Schematic and Connection diagrams (also known as wiring diagram) are the two main types of wiring diagrams.
Using the schematic diagram, you can learn the sequence of operation if it’s an appliance you’re not sure of.
The position diagram shows the location of all components and is most often not included by the manufacturer.
Schematic diagrams are also known as ladder diagrams and are helpful when you need to see the electrical current flow. Schematics will not show the physical location of any equipment in the circuit. Schematic diagrams move from left to right. The left side is the hot or line side. Switches and loads are in the middle. Neutral or common is on the right side.
The reversing valve is the heart of a heat pump’s ability to provide year-round comfort. It is the component responsible for seasonal switching, physically redirecting refrigerant flow to turn an air conditioner into a heater. For many technicians, however, the reversing valve is a source of frustration. It is often misdiagnosed and condemned prematurely when the real issue lies in the electrical system or the refrigerant charge. Understanding exactly how these valves function is the first step toward faster, more accurate service calls.