| 摘要 |
PURPOSE:To prevent the surface of lubricating oil from lowering without reference to the rotational direction of the other refrigerant compressor in case an electric source is in antiphase by stopping one refrigerant compressor and operating only the other refrigerant compressor. CONSTITUTION:In the case of antiphase connection, current is intercepted from a relay coil 26 by an antiphase preventer 25 for opening its contact 27. Thereby, a coil 24 of an electromagnetic contactor is demagnetized, and a contact 22 to a motor A-2 of the second refrigerant compressor 2 is opened. Then, the revolution of this motor A-2 is stopped to stop the operation of the second refrigerant compressor 2. However, the operation of the first refrigerant compressor 1 is singly continued to maintain lubricating oil without reference to the rotational direction. |
