Guided Tour Learning Objectives clearly identify the knowledge and skills to be obtained when the chapter is completed. Introduction provides an overview and preview of the chapter content. Technical Terms list the key terms to be learned in the chapter. Review this list after completing the chapter to be sure you know the definition of each term. Thinking Green notes highlight key items related to sustainability, energy efficiency, and environmental issues. Code Alerts point out specific information and requirements from environmental regulations and applicable building codes. Cautions alert you to practices that could potentially damage equipment or instruments. The instructional design includes student-focused learning tools to help students succeed. This visual guide highlights the features designed for the textbook. Service Call Troubleshooting features present service call scenarios followed by discussion questions that will help develop your troubleshooting skills.