Descaling Dishwashers

Figure 10-44.—Steamer. Figure 10-45.—Steam table. meal. These machines have separate wash and rinse tanks. They also have a final rinse of hot water that is sprayed on the dishes from an outside source. This spray is opened by the racks as they pass through the machines. The spray automatically closes when the rinse cycle is completed. The final rinse is controlled by an adjustable automatic steam-mixing valve that maintains temperature between 180°F and 195°F. double-tank machines are also equipped with a thermostatically operated switch in the rinse tank. This switch prevents operation of the machine if the temperature of the rinse water falls below 180°F. The racks pass through the machine automatically on conveyor chains. Utensils should be exposed to the machine sprays for not less than 40 seconds (20-second wash, 20-second rinse). Descaling Dishwashers You should prevent the accumulation of scale deposits in dishwashing machines for at least two reasons. First, excessive scale deposit on the inside of pipes and pumps will clog them. This will interfere with the efficient performance of the machine by reducing the volume of water that comes in contact with the utensils during the washing and sanitizing process. Second, scale deposits provide a haven for harmful bacteria. The supplies needed for descaling are available through Navy supply channels. See the following supply list: 10-51