What essential safety measure must be taken when charging refrigerant into a system?

When charging refrigerant into an HVAC system, ensuring that no leaks are present is crucial for several reasons. Leaks can pose serious safety hazards, including the potential for refrigerant escape, which can harm the environment and deplete the ozone layer. Moreover, if there are leaks within the system, it can lead to incorrect pressure readings and affect the overall performance and efficiency of the system. A system that is not sealed can also result in health risks for the technician, as refrigerants can be harmful if inhaled and can cause frostbite or other injuries upon contact with skin.

In this context, ensuring there are no leaks prior to charging the system allows for a more controlled and effective process. It means that the refrigerant can be safely added without fear of loss to the atmosphere, ensuring that the system operates correctly and efficiently once charged. This critical safety measure is foundational to proper HVAC practices and aligning with environmental regulations.