Where is the oil trap usually located in a refrigeration system?

The oil trap is strategically located on the discharge line in a refrigeration system. This placement is vital because the oil trap's primary function is to collect and retain the lubricating oil that is carried along by the refrigerant in the discharge vapor. When refrigerant gas exits the compressor, it often contains small amounts of oil that must be recycled back into the compressor to ensure proper lubrication and operation.

Having the oil trap on the discharge line allows for effective separation of the oil from the refrigerant before it reaches other components, which could otherwise lead to inadequate lubrication, decreased efficiency, and potential damage to the system. By allowing excess oil to settle, the trap ensures that the appropriate amount of oil returns to the compressor while minimizing the risk of oil flooding or starvation in the evaporator or expansion valve.

This design helps maintain optimal performance and longevity of the refrigeration system. The other options, while related to different components of the system, do not serve the same purpose or provide the same benefits regarding oil recovery and management.