The Heatcraft Refrigeration 22929501 looks to be a cold water coil, which is commonly used in commercial refrigeration systems. Cold water coils are heat exchangers that transfer heat from the airstream to a chilled water loop. As air passes over the coil, the refrigerant absorbs heat, causing the air to cool. This cold air is then circulated throughout the area to keep the proper tem... https://www.partshnc.com/22929501-heatcraft-refrigeration-30in-28-degree-cw