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Page Title: Double-tank Method
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operated  machines,  wash  and  rinse  intervals  are controlled by the operator who should allow a 40-second wash and a 10-second rinse. To control the bacteria to a satisfactory minimum in single-tank   machines,   it   is   necessary   that   the temperature of the wash water in the tank be 140°F to 160°F.  Therefore,  a  thermostat  is  provided  in  the automatic machines to prevent operation when the temperature  of  the  water  falls  below  140°F. Rinsing is done by means of spraying hot water on the dishes from an outside source and is controlled by an  adjustable  automatic  steam-mixing  valve  that maintains the temperature of the rinse water between 180°F to 195°F. Double-tank Method Double-tank  machines  (fig.  4-14)  are  available  with several different capacities and are used when more than 150  persons  are  to  be  served.  These  machines  are provided with 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  passing  through  the  machine.  The  spray automatically closes when the rinse cycle is completed. The final rinse is controlled by an adjustable automatic steam-mixing valve that maintains the temperature between 180°F to 195°F. Double-tank machines are also equipped with a thermostatically operated switch in the rinse tank that prevents operation of the machine if the  temperature  of  the  rinse  water  falls  below  180°F. The racks pass through the machine automatically by means  of  conveyor  chains.  The  two-tank  dishwashing machine should be timed so that the utensils are exposed to the machine sprays for not less than 40 seconds (20-second  wash,  20-second  rinse). Triple-tank  Dishwashing  Machines Some  shore  activities  have  triple-tank  dishwashing machines installed. The procedures of operation are basically the same as with double-tank machines with the  following  exceptions: l The dishwashing machine consists of prewash, wash, and rinse sections with a final rinse. .  Refer  to  the  manufacturer’s  operating  and instruction manual for the preset temperatures of the Figure  4-14.—Double-tank  dishwashing  machine. 4-20

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