What is a vacuum pump used for in refrigeration?

A vacuum pump is a crucial tool used in refrigeration systems primarily to remove moisture and air from the system. This is essential because both moisture and air can lead to a number of problems including reduced efficiency, increased wear and tear on components, and potential for freezing inside the system.

When a refrigeration system is being serviced or installed, it is important to evacuate any trapped air and moisture to create a proper vacuum. This ensures that when the refrigerant is charged into the system, it can circulate optimally without the presence of contaminants that can alter its properties and lead to inefficient operation or damage.

Moisture in the system can also lead to the formation of acids or other unwanted reactions that can corrode internal components, while air can introduce non-condensable substances that affect system pressure characteristics. Thus, using a vacuum pump to evacuate the system before charging is a standard practice that supports the longevity and efficiency of refrigeration systems.