Theory and troubleshooting using short modules packed with images to make learning quick and easy.
Lessons on reading wiring diagrams and tracing circuits. For students and working technicians learning to follow a diagram on a service call.
A field guide to avoiding premature valve condemnation and mastering the 4-way mechanism. 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…
Position diagram The position diagram shows the location of all components and is most often not included by the manufacturer. Schematic Diagram 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.…
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 connection diagram (also…