Book excerpt: Reader-friendly and packed with useful tips, photos and charts, COMMERCIAL REFRIGERATION FOR AIR CONDITIONING TECHNICIANS, Fourth Edition, helps you apply existing HVACR skills to new concepts in order to service medium- and low-temperature refrigeration equipment such as walk-ins, reach-ins, refrigerated cases and ice machines. The text focuses on the food service industry and includes �how-to� advice from experienced professionals on installing, servicing and troubleshooting commercial equipment. Extensively updated throughout the text, the Fourth Edition includes a simplified, step-by-step flowchart for quickly diagnosing and addressing the nine most common refrigeration problems on the job--as well as new information on the latest advances in commercial refrigeration. Ideal for advanced refrigeration courses, this trusted text is equally valuable as a real-world resource you can take from the classroom to keep on hand in the truck or shop. COMMERCIAL REFRIGERATION FOR AIR CONDITIONING TECHNICIANS, Fourth Edition, is an indispensable tool for any technician working with commercial refrigeration today.