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Over the past several decades, the control of heating and air conditioning systems has undergone an evolution from mechanical to electrical to electronic, and finally to computerized technologies. In order to troubleshoot and service all types of systems, technicians and control professionals must have knowledge of the full spectrum of control devices representing this evolution. The purpose of this book is to provide the environmental control professional with a clear understanding of the operation of lectrical and electronic components and systems that are utilized in control functions. The interrelationship of electrical and magnetic control devices in today's systems is clearly explained, as well as their relationship to motors, contactors, relays, transformers and semiconductor devices. The authors present logical techniques which can be readily used to analyze system problems, and expedite their repair. Examples throughout the book present a variety of application, testing and troubleshooting scenarios for systems which employ state-of-the-art technologies and meet current standards.
