MIL- HDBK- 740
SECTION VIII - DESCALING PROCEDURES FOR MECHANICAL DISHWASHING MACHINES SINGLEW/MULTIPLE TANK)
A. Operation. - When noticeable deposits of scale are observed in the wash and rinse tanks of dishwashers, the following procedures should be used:
1. Drain both wash and rinse tanks.
2. Close the wash- and rinse-tank drain valves. Add about 12 gallons of hot water to the tank (or in each tank of a dual-tank machine).
3. Sprinkle approximately six ounces (one cupful) of scale- removing compound, FSN 6850-637-6142, on the scrap trays of both the rinse and wash compartments.
4. Start recirculation of the solution without the addition of water. Maintain a temperature between 160°F and 190°F. Check color of solution every 10 minutes. Carbon dioxide is evolved as long as scale and scale remover are present, and the solution will remain red as long as the scale remover is present.
5. If scale is not completely removed and solution is yellow, sprinkle another cupful of the scale-removing compound on each scrap tray. Continue recirculation. Swab untouched scaled areas with this solution. Add more remover if required. Scale on the final spray headers may be removed by using a scrub brush, FSN 7920-061-0038, and a small amount of remover made into a paste with water.
6. After the scale is removed, gases cease to form and the color
of the solution remains pink-red.
Drain solution.
7. Fill both wash and drain tanks with fresh water. Circulate for
5 minutes. Drain wash water.
8. Refill tanks and repeat operation in paragraph (7).
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