What is a potential consequence of not using a filter drier in a refrigeration system?

Using a filter drier in a refrigeration system is crucial for maintaining the integrity and efficiency of the system. One of the primary roles of a filter drier is to remove moisture and contaminants from the refrigerant before it circulates throughout the system. If moisture is allowed to enter the refrigeration system, it can lead to several problems, such as acid formation and system corrosion. Additionally, moisture can freeze at low temperatures, leading to blockages in the system which can impair functionality.

Therefore, the absence of a filter drier can result in moisture entering the system, making this the correct answer. This highlights the importance of proper filtration to ensure the refrigeration system operates smoothly and reliably.