How should the drainline of an ice cream machine be connected ideally?

The ideal method for connecting the drainline of an ice cream machine is through an open receptacle with an air gap to the sewer. This design ensures that any wastewater from the machine can flow freely into the municipal sewer system while preventing the potential backflow of sewage into the machine.

The air gap acts as a physical break between the waste source and the sewer, effectively minimizing the risk of contamination that could occur if a siphoning action were to happen. Proper placement of the air gap is essential to maintain health and safety standards, as it prohibits bacteria or other harmful substances that may exist in the sewer from re-entering the ice cream machine or affecting the product.

The other options do not provide the same level of protection against contamination. A sealed pipe directly to the sewer does not allow for any air gap, potentially leading to backflow issues. A closed tank could lead to overflow and other maintenance problems, and simply connecting to a sump may not adequately address potential contamination from the sewage.