Commercial Refrigeration for Air Conditioning Technicians : refrigeration, evaporators, condensers, compressors, metering devices, controls and accessories, refrigeration system troubleshooting, compressor motor controls, retrofitting, recovery, evacuation and charging, supermarket refrigeration, walk-in refrigerators and freezers, ice machines, product temperatures for preservation, refrigeration business tips, minimum temperatures, ice machine types and applications, matching compressor horsepower, coil defrosting, mechanical sub-cooling, liquid recovery with a tank in a vacuum.