A text dedicated to the operation, troubleshooting, and repair of 57 different electric and electronic control for heating, ventilation, air-conditioning, and refrigeration systems. Controls treated include gas valves, humidistats, bypass timers, solenoid valves, electromagnetic relays, modulating motors, commercial defrost systems, current sensing relays, and integrated furnace control modules. Introductory sections explore the basic types of control systems and explain basic control theory. In addition, a six-step troubleshooting procedure is presented and 15 practice labs let students exercise their troubleshooting skill. Annotation c. by Book News, Inc., Portland, Or.
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