A method of operating a refrigeration system includes initiating a compressor shutdown operation, determining a difference in a saturation temperature at a port of a compressor of the refrigeration system and an ambient temperature and comparing the difference in the saturation temperature and ambient temperature with a threshold. If the difference in the saturation temperature and ambient temperature is less than or equal to the threshold, a pump down operation is performed and if the difference in the saturation temperature and ambient temperature exceeds the threshold, a compressor shutdown operation is completed.

The present disclosure provides an apparatus integrated with cooling components. The apparatus comprises heat generating components and cooling components for delivering a cooling airflow to the heat generating components. The cooling components are arranged along one side of the apparatus and upstream of the heat generating components along a direction of the airflow generated by the cooling components. The cooling components are rotatable towards an outside of the apparatus to expose the heat generating components. The apparatus integrated with cooling components of the present disclosure can effectively improve the maintenance efficiency of the cooling components and other important components.

There is provided a chiller control device (50) of a chiller system (1) that is provided with a centrifugal chiller (11) provided with a compressor (60) rotated by a motor (72), an operation panel (20) which is provided in the centrifugal chiller (11), operates the centrifugal chiller (11), and displays a state of the centrifugal chiller (11), and a starting panel (20) which supplies power to the motor (72) and starts the motor (72). The starting panel (10) begins supplying power to the motor (72) of the compressor (60) in response to a start command from the centrifugal chiller (11) to start the motor (72), and outputs a start answer and a start completion signal to the centrifugal chiller (11), and an abnormal state is output to the operation panel (20) if the start answer and/or the start completion signal continue to be output after the centrifugal chiller (11) has stopped.

A method for defrosting an evaporator of a sealed system includes determining that a defrost cycle is needed to remove frost from the evaporator and initiating such a defrost cycle. The method further includes determining that the defrost cycle failed to defrost the evaporator and repeating the defrost cycle until the defrost cycle is successful or until a predetermined number of defrost cycles have been performed. After a predetermined number of successive failed defrost cycles, the method includes preventing further operation of the sealed system, e.g., by locking out compressor, until the frost and/or ice build-up is removed.

A refrigeration cycle apparatus is provided with a compressor, a condenser, a pressure-reducing device, and an evaporator. The refrigeration cycle apparatus comprises a refrigeration cycle configured to circulate refrigerant; and a control unit configured to control the refrigeration cycle. The control unit causes the refrigeration cycle to operate when an operation condition is satisfied, the operation condition including elapse of a preset time after the control unit stops the refrigeration cycle. The control unit detects abnormality of the refrigeration cycle based on state data indicating a state of the refrigeration cycle after the control unit causes the refrigeration cycle to operate.

A compressor system includes a first compressor and a second compressor. A suction equalization line fluidly couples the first compressor and the second compressor. A first branch suction line is fluidly coupled to the first compressor and a second branch suction line is fluidly coupled to the second compressor. A main suction line is fluidly coupled to the first branch suction line and the second branch suction line. An obstruction device is disposed in at least one of the first branch suction line and the second branch suction line. Responsive to deactivation of at least one of the first compressor and the second compressor, the obstruction device is at least partially closed thereby causing prescribed liquid levels in the first compressor and the second compressor during partial-load operation.

An air conditioner is provided that reduces user discomfort due to vibrations and noises at a compressor, piping, and the like such as of an air conditioner. To achieve this, an air conditioner includes: a compressor (10) that has a motor (12) and a compression mechanism (14) driven by the motor (12); a speed detector (43) that detects a rotation speed of the motor (12); a drive mode controller (48) that controls a drive mode of the motor (12); and refrigerant piping that is connected to the compression mechanism (14) and allows a refrigerant to flow therethrough, wherein the drive mode controller (48), for stopping the motor (12), decelerates the motor (12) to a rotation speed equal to or lower than a resonance frequency between the compression mechanism (14) and the refrigerant piping.

A method of shutting down a refrigeration system including: initiating a shutdown process of the refrigeration system; closing a first valve within a refrigerant circuit of the refrigeration system; operating a compressor within the refrigerant circuit; detecting a suction pressure within the refrigerant circuit; closing a second valve within the refrigerant circuit of the refrigeration system when the suction pressure is below a threshold suction pressure; and stopping operation of the compressor.

A preheater for a compressor that is capable of heating a lubricant oil efficiently with smaller power is provided. A preheater for a compressor includes: a capacitive oil surface sensor that is provided at a compressor used in a refrigerating cycle, and detects an oil surface of a lubricant oil A in the compressor; and a power supply unit that applies high-frequency voltage to the oil surface sensor.

A vapor compression system and method for operating the vapor compression system are provided. The vapor compression system includes a compressor, a condenser, and at least one check valve disposed between the compressor and the condenser. The method provides for the transmitting of a shutdown command to the compressor, the compressor including a rotating shaft and a magnetic bearing, the magnetic bearing having an active mode and an inactive mode, the magnetic bearing levitating the rotating shaft in the active mode. The method further provides for the maintaining of the magnetic bearing in the active mode during a minimum time period, the magnetic bearing switching from the active mode to the inactive mode after the minimum time period is reached.