What is the purpose of a trap in refrigerant piping?

The purpose of a trap in refrigerant piping primarily relates to the behavior of oil within the refrigeration system. In refrigeration systems, lubricating oil is circulated along with the refrigerant to ensure that the compressor and other components operate smoothly. However, due to the differences in flow characteristics and pressure levels, oil can sometimes become entrained with the refrigerant vapor.

A trap is strategically placed in the piping to collect this oil as it flows through the system. By allowing for oil collection, the trap ensures that adequate lubrication reaches the compressor and other vital components, preventing compressor damage due to insufficient lubrication. Thus, the role of the trap in facilitating this oil collection is critical for maintaining the efficiency and longevity of the refrigeration system.