This course is designed as an overview of the concepts and principles that apply to complex HVACR (heating ventilation and air conditioning refrigeration) systems found in the HVACR industry. Topics include an overview of service strategies for commercial / industrial HVAC systems. This course will require the students to draw on the knowledge gained in previously completed advanced HVACR courses to solve complicated HVACR system wide service problems and procedures. Prerequisites: HVAC227M, HVAC228M, HVAC243M, HVAC244M, HVAC256M.