Where can oil be drained from an ammonia system?

In an ammonia refrigeration system, oil is typically drained from specific components where it accumulates. Oil pots and some evaporators are designed to collect oil that separates out of the refrigerant due to differences in density and solubility. These components make it convenient to collect and remove oil without interfering with the overall function of the system.

Oil pots are specifically designed for this purpose—they accumulate oil so that it can be drained periodically to maintain efficient system operation. Certain evaporators may also allow for oil separation and retrieval, as oil can accumulate during the refrigeration cycle.

While oil can also exist in the high-pressure and low-pressure receivers, these components are not primarily designed for draining oil. Instead, they serve other roles in the refrigeration cycle, such as storing refrigerant. Therefore, stating that oil can be drained from oil pots and some evaporators captures the correct context of where oil management occurs in the system.

In summary, the presence of oil in various locations throughout an ammonia system is more effectively managed through specific components like oil pots and evaporators, making these the appropriate options for oil drainage.