| 摘要 |
PROBLEM TO BE SOLVED: To improve the reliability in control by matching a controlled opening and an actual opening of an electric expansion valve, and to dispense with selecting the electronic expansion valve. SOLUTION: When an electric expansion valve 36 is controlled to a small opening near a minimum opening, the controlled opening is corrected to shift the controlled opening to the actual opening of the electric expansion valve 36 on the basis of a refrigerant condition at that time. This refrigeration unit comprises an opening correction part 85 for correcting the controlled opening to an opening side when the refrigerant condition that a degree of suction overheat of a compressor 30 is more than a predetermined value, and a pressure of a low-pressure refrigerant of the compressor 30 is less than a predetermined value, is continued in small opening of the electric expansion valve 36, and a closing correction part 86 for correcting the controlled opening to a closing side when the refrigerant condition that the degree of suction overheat of the compressor 30 is less than the predetermined value is continued in small opening of the electric expansion valve 36. Further when the opening correction part 85 corrects the controlled opening to the opening side, the electric expansion valve 36 is temporarily opened to a predetermined opening prior to the normal control.
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