A detailed guide on the process of servicing and maintaining an air conditioning system. The technician is shown using a manifold gauge to measure the pressure of refrigerant in the system. The first step involves evacuating old gas from the system through high- and low-pressure valves. The technician then checks for any leaks before adding new refrigerant, using a refrigerant tank. The system is also tested for proper airflow and pressure, ensuring efficient operation. Additionally, the technician checks for any possible refrigerant leaks using a leak detector and ensures that the new refrigerant is compatible with the system. Properly maintaining the air conditioner ensures it runs efficiently and extends its lifespan. This visual guide is a great reference for those working with HVAC systems or looking to understand the basic maintenance steps.