What is low ambient head pressure control and when is it needed ?
Low ambient head pressure control is any one of a number of accessory systems that are applied to refrigeration systems that require cooling while the condensing coil is exposed to low temperatures. Typically any wine cellar can fall into this category if the condensing unit is located outdoors. Wine cellars are normally located in space that is heated in the winter to around 70 degrees F. Since the cellar is supposed to be maintaining 55 degrees F, the condensing unit may be running in very cold weather. The system will operate as if the condenser is oversized and lacking refrigerant. The cooling effect in the refrigerated space may be erratic and there is the possibility of frequent cycling of the condensing unit.
