This Paperback is dedicated to those who are eager to learn the HVACR Trade and Refrigerant Charging/Troubleshooting Practices. In this book, you will find Step by Step Procedures for preparing an air conditioning and heat pump system for refrigerant, reading the manifold gauge set, measuring the refrigerants charge level, and troubleshooting problems with the system’s refrigerant flow. This book differs from others as it gives key insights into each procedure along with tool use from a technician’s perspective, in language that the technician can understand. This book explains the refrigeration cycle of air conditioners and heat pumps, refrigerant properties, heat transfer, the components included in the system, the roles of each component, airflow requirements, and common problems. Procedures Included: Pump DownVacuum and Standing Vacuum TestRecovery and Recovery Bottle UseRefrigerant Manifold Gauge Set and Hose ConnectionsService Valve Positions and Port AccessPreparation of the System for RefrigerantRefrigerant Charging and Recovery on an Active SystemTroubleshooting the Refrigerant Charge and System Operation