Introduction to commercial refrigeration systems, different types of refrigeration systems, and their methods of operation. Skill development includes understanding and identifying the types of controls required to control temperature, air circulation, and defrost procedures; performing refrigeration load calculation; and selecting equipment-all in accordance with the guidelines of The Clean Air Act of 1990 related to commercial refrigeration. 4 Credits (2 Lecture - 6 Lab) Prerequisite(s): ACR111. Corequisite(s): ACR126.