This document contains a teacher's guide and student guide for a high school-level competency-based course in air conditioning and refrigeration (ACR) equipment electrical systems. Presented in the teacher's guide are the following: explanation of the instructional units' use; competency profile for recording students' performance of the tasks in each unit; national competencies correlated to the unit objectives, assignment sheets, and job sheets; a list linking unit tasks to the related academic workplace skills and competencies they are designed to reinforce; a list of required tools, equipment, and materials; and a list of the six references used to develop the publication. Presented next are the 15 units of instruction. Each unit contains some or all of the following: objective sheets, suggested activities, written test, unit evaluation activity, assignment sheet and written test answers, teacher supplements, transparency masters, information sheet, student supplements, and assignment sheets. The following topics are covered: fundamentals of electricity; tools, materials, and test instruments; electrical power; circuits, symbols, and diagrams; controls and protection devices; transformers and relays; thermostats; introduction to electric motors; split-phase motors; capacitors; capacitor motors; three-phase motors; troubleshooting ACR system electrical circuits; and ACR system wiring diagrams. The corresponding units in the student's guide contain some or all of the following: objective sheets, information sheets, student supplements, assignment sheets, and job sheets. (MN)