| 摘要 |
<P>PROBLEM TO BE SOLVED: To prevent the stopping of a refrigerator to the utmost without immediately stopping the refrigerator even if a high-pressure side pressure abnormally increases. <P>SOLUTION: The capacity control type screw refrigerator includes: a low-pressure side pressure sensor which includes a screw compressor to detect low-pressure side pressure on the refrigerant intake side of the screw compressor; and a high-pressure side pressure sensor for detecting the high-pressure side pressure on a refrigerant discharge side. In an operation control method for the capacity control type screw refrigerator, a full-load operation, an unload operation in which a refrigerating capacity becomes lower than in the full-load operation, and the stopping of the operation can be selected as an operation mode. When a high-pressure side pressure value PH detected by the high-pressure side pressure sensor exceeds a specified value P1 and continues for a first predetermined time t1, control is performed so that the unload operation can forcedly continue for a second predetermined time t2. <P>COPYRIGHT: (C)2012,JPO&INPIT |
