First we need to determine if frost is present:
We use a screwdriver as a sensor, listening to the exit of the copper capillary tube, when the evaporator on the frost layer began to melt, copper capillary tube outlet airflow sound decreases, and there are intermittent blocking sound; with an electric chrome iron or an alcohol lamp baked capillary tube outlet, the airflow sound increases, the evaporator immediately on the frost, which indicates that the phenomenon is the "ice blockage"; or in the low-pressure end of the refrigeration system connected to a vacuum gauge to test, when the low-pressure pressure is negative, indicating the occurrence of frost ice blockage in the gross copper tube. Refrigeration system in the low-pressure end connected to a vacuum gauge to test, when the low-pressure pressure for the negative, indicating that the hair of the purple copper tube in the occurrence of frost ice plug.
The solution is as follows:
Step 1: First stop the compressor work, cut off the power supply of the refrigerator.
The second step: the compressor steel shell on the refrigerant-filled tube mouth open, drain the system refrigerant. Use 1.6MPa high-pressure nitrogen to carry out high-pressure leakage detection of the system, sealing 24h shall not leak.
Step 3: Vacuum the system with a vacuum pump, when the system reaches 86KPa, the seal shall not leak for 18h. Charge refrigerant into the refrigeration system.
After the above judgment process as well as the solution process, the refrigerator copper tube frost problem will be solved, the refrigerator copper tube as an important part of the refrigerator refrigeration system, frost phenomenon must be taken seriously.
