| 摘要 |
<P>PROBLEM TO BE SOLVED: To make the operation of a two-stage screw compressor selectable between a capacity control mode and a simple on/off-control mode because an operation manager sometimes desires to control an in-storage temperature by simple control, on ground that taking the measure of conditions of an operation setting value is important on account of importance of the operation setting value, as a controlled state of the in-storage temperature of a freezing cold storage etc. is changed depending on the operation setting value of a pressure switch, though the capacity of the two-stage screw compressor for use in the freezing cold storage etc. is controlled by pressure detection with the pressure switch. <P>SOLUTION: The pressure switch a first control value for controlling the capacity of the two-stage screw compressor and a second control value for performing simple on/off-operation control in which the capacity is not controlled are provided as set values for performing a cut-in and cut-out operation where the capacity control mode is developed upon the selection of the first control value by a selection means for selecting either of the first and second control values, and the simple on/off-operation control mode is developed upon the selection of the second control value by the selection means. <P>COPYRIGHT: (C)2012,JPO&INPIT |
