

■ Interpret the wiring diagram of a split air-conditioning system with a low-voltage control circuit. ■ Interpret the wiring diagram of a window-type or through- the-wall air-conditioning unit. Pictorial diagrams contain the same information as ladder diagrams but are formatted differently. ■ Determine the sequence of operations of an appliance by interpreting the appliance’s wiring diagram. It shows how a electrical wires are interconnected and may also show where fixtures and components might be attached to the system. ■ Convert a schematic wiring diagram to a ladder diagram. A wiring diagram is a simple visual representation with the physical connections and physical layout of your electrical system or circuit. ■ Discuss the different types of electrical wiring diagrams and their advantages and disadvantages. ■ Identify various electrical symbols used in wiring diagrams.
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■ Explain the purpose of electrical wiring diagrams. This compatibility not only speeds the 3D design by removing the tedious, manual process of interpreting 2D schematic diagrams, but also Creo Schematics.

199 9 Electrical Wiring Diagram Basics Chapter Outline 9.1 Electrical Devices 9.2 Electrical Symbols and Wiring Diagrams 9.2.1 Pictorial Wiring Diagrams 9.2.2 Schematic Wiring Diagrams 9.2.3 Ladder Diagrams 9.2.4 Sequence of Operations 9.2.5 Converting Schematic Diagrams to Ladder Diagrams 9.3 Basic Window Air-Conditioning Unit Wiring Diagrams 9.4 Basic Split Air-Conditioning System Wiring Diagrams 9.4.1 Thermostat 9.4.2 Indoor Fan Controls on a Ducted Heating and Cooling System 9.4.3 Outdoor Controls on a Ducted Heating and Cooling System Learning Objectives After studying this chapter, you will be able to: ■ Describe the types of electrical devices found in a wiring diagram. DC Power Sourcesĭirect current (DC) power sources provide electric current that flows in a constant direction.Copyright Goodheart-Willcox Co., Inc. Every functional electronic circuit needs to have a DC or AC power source.

Power sources supply electrical energy to a circuit in the form of voltage and current. Kerosene, heating oil, and liquid propane are the most common fuel sources used in the combustion chamber of the boilers. The fuel that is burned in this chamber varies.
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After this article, I recommend reading How to Analyze Circuits, where we discuss more advanced circuit analysis techniques like Kirchhoff’s Current Law and Kirchhoff’s Voltage Law. The burner creates combustion in this chamber that heats the heat exchanger up to several hundred degrees. You should also be able to get a rough idea of how the circuit works, just by looking at the schematic. It’s not enough to just be able to recognize the components in a schematic. The main goal of this tutorial is to show you the essential schematic components you should know. Each physical component (i.e resistor, capacitor, transistor) has a unique schematic symbol.

To start developing your schematic reading abilities, it’s important to memorize the most common schematic symbols. In electrical schematics, the symbols stand for various components. This type of diagram shows the various components without regard to their physical location, how the wiring is marked, or how the wiring is routed. A typical schematic of a packaged air conditioner is shown in Figure 1 on the next page. The ability to read electrical schematics is a really useful skill to have. This simplified diagram provides the means to readily identify the components of a system, even if you are not familiar with their physical appearance.
