Carriers’ Technical Development Program is a review of basic engineering principals and system applications in the HVAC industry. The topics to be covered include: Rooftop Units Level I – Constant Volume, Rooftop Units Level II – VAV Rooftops, Commercial Split Systems, Central Station Air Handlers, Air Cooled Chillers, Water Cooled Chillers, Psychrometrics, Load Estimating, Duct Design, Water Piping Design, Refrigeration Piping Design, and Refrigeration Cycle. Refrigerant piping is an essential part of the refrigeration cycle because it connects the components of the refrigeration cycle together and permits them to function properly. Proper sizing of the refrigerant lines is critical to make sure capacities are not overly diminished while ensuring we get proper oil return back to the compressor. This lesson will cover how to properly size the various refrigerant lines and discuss proper routing techniques.