Introduction to Inspection and Handling Methods for Refrigerant Leak in Cold Storage

If you don't observe any refrigerant in the sight glass of the cold storage liquid receiver, it indicates that there is a refrigerant leak in the cold storage.

First, it should be determined whether it is an external leak or an internal leak. If it is an external leak in the cold storage. For example, if the cold storage has not been used for a long time, it is possible that there will be leakage problems in the pipeline system. This is because some cold storage pipelines are made of aluminum pipes. So, when not used for a long time, the aluminum pipes are prone to developing leaks. First, a remedial measure can be taken. Repair the leak. Then, re - check for any other leak points. After confirming there are none, start evacuating the system to prepare for refrigerant charging.

If it is an internal leak problem, generally, copper pipes need to be coiled.

Professional refrigeration maintenance personnel should be hired to handle this. Of course, the refrigerant is added from the low - pressure end after evacuation. Compressors are generally equipped with suction and discharge valves, and the liquid - charging port is usually on the multi - purpose port of the suction valve.

The self - compressor can be used to evacuate the system.

Open all valves in the system except those communicating with the atmosphere, close the discharge valve of the compressor, open the discharge bypass port, temporarily short - circuit the low - pressure pressure controller, and start the compressor. At this time, the non - condensable gases in the system are sucked in by the compressor and discharged from the discharge bypass port until no gas is discharged from the bypass port and the low - pressure stabilizes in a vacuum state. Then, close the bypass port, stop the compressor, open the discharge valve of the compressor, restore the low - pressure pressure controller, and the system evacuation is completed.

After the system is evacuated, refrigerant can be charged directly by using the pressure difference to stop the machine.

After the pressure in the system is balanced with the pressure in the refrigerant cylinder, start the compressor to charge the refrigerant. The expansion valve does not need to be adjusted, and the adjusting rod is generally in the middle position. After the compressor is started, slowly open the liquid - charging valve until the refrigerant volume in the system reaches the specified liquid level, and the refrigerant charging is completed.