What would be a common indicator of refrigerant contamination?

A common indicator of refrigerant contamination is the presence of acid, oil, or particulates. When refrigerant becomes contaminated, it can lead to various byproducts that negatively affect the system's performance and durability. The presence of these contaminants can indicate issues such as overheating, which might lead to the formation of acids, or the introduction of foreign materials that can obstruct components.

Acid can form through chemical reactions in the system, often due to moisture or improper maintenance, resulting in deterioration of the compressor and other components. Similarly, oil contamination can occur from compressor failure, leading to mixed lubricants, which can impair the operation of the refrigeration cycle. Particulates can clog filters and obstruct flow paths, making it essential to monitor and eliminate these contaminants to protect the efficiency and longevity of the HVAC system.

In contrast, while color changes in refrigerants, changes in pressure, and lower energy efficiency can be associated with refrigerant issues, they are often secondary symptoms and may not directly indicate contamination without further investigation. The presence of contaminants is a direct and tangible indicator of a problem that needs addressing.