Scale deposition apparatus and water heater and scale precipitation method

摘要

Close the valve 7 and 9, open the valve 4 and 12, the controller 31 is introduced into the vacuum degassing tank 1 the water to be treated in the introduction pump 3. Then the water level of one vacuum degassing tank reaches a predetermined position, the controller 31 stops the introduction pump 3, I close the valve 4,12. Then open the valve 9, the controller 31 performs the water being treated "vacuum degassing" a vacuum pump 10. Then stop the vacuum pump 10, close the valve 9, the controller 31 to the "atmospheric pressure open" a vacuum degassing tank 1 to open the valve 12. Then open the valve 9 is closed with the valve 12, by driving the vacuum pump 10, the controller 31 performs the vacuum degassing of the water to be treated again. Thereafter, after a predetermined number of times alternately "atmospheric pressure release", and "vacuum degassing", perform the vacuum degassing Finally, the controller 31 ends the process.