| 摘要 |
PROBLEM TO BE SOLVED: To properly carry out control of ice making regardless of water quality of cooling water. SOLUTION: A first reference value for normal water (upper reference value is 170 KΩand lower reference value is 74 KΩ) and a second reference value for water having high conductive material content (upper reference value is 110 KΩand lower reference value is 40 KΩ) are prepared as a reference value for controlling a driving of a compressor. Depending on the water quality of a service water used for the cooling water, any of the first reference value and the second reference value is selected. In a case where the service water is the normal water, when icing advances and a measured value of an ice reservoir sensor reaches 170 KΩas shown in a characteristic line X, it is determined that the ice reservoir sensor is covered with ice, and the compressor is stopped. When the measured value decreased to be 74 KΩ, it is determined that there is no ice, and the compressor is driven again. In a case where the service water is the water having high conductive material content, as shown in a characteristic line Y, when the measured value reaches 110 KΩ, the compressor is stopped, and when the measured value is decreased to be 40 KΩ, the compressor is driven again. COPYRIGHT: (C)2003,JPO
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