To read wiring schematics for a Trane brand gas furnace, visit ManualsOnline.com, which is an online directory that contains manuals with schematics diagrams. Diagrams within the Trane manuals have a legend or key that shows what each shape or pattern represents on the wiring schematic.
To access the Trane wiring schematics for gas furnaces, select Household Appliances from the Categories drop-down menu, and then find Trane under the Brands section in the left column. From the Product Types, select Furnace, and choose the manual that corresponds with your gas furnace model. To access the product's manual page, click the title from the results list. Navigate to the manual page with the wiring schematics diagram using either the platform within the browser, or a PDF reader.
To understand the diagram, observe all patterns on the illustration, and then refer to the Legend typically located to the left of the image. Each symbol within the Legend is representative of different forms of wiring terminology such as switches, connectors, fuses and coils, along with other terms. Additionally, the Legend lists abbreviations that symbolize certain colors, gas valves, terminals, inputs and outputs, in addition to other terms. Wiring schematics are annotated with additional notes regarding how to connect wires and what to expect while performing the process.