Freezer fault how to do, home freezer maintains a trick to recommend
As is known to all, freezers work under normal conditions, and low back pressure is generally between O.05MPa and 0.08MPa. The high pressure is between 1.1MPa and 1.35MPa. Low pressure at this pressure, the refrigeration temperature is between -5 C ~ -18C. At this pressure, the heat dissipation temperature is between 45 C and 58 C. Accordingly, when choosing a freezer, the length of the capillary should be chosen just in line with this data.In actual work, if the smoke has been pumped, add freon, it is difficult to see in a short time the capillary is long, or short. Because the compressor has been working for many years, the efficiency will be reduced. When the repair, the capillary is cut short and evaporatedThe pressure will be increased. When the cooling effect is not good after the test machine. The new capillary discharged F12 adjustment length, short, free, time and money.
As for the choice of capillary, many countries have published many calculation formulas and methods. But due to the capillary gas and liquid pressure, temperature and flow theory is complicated. In the practical application. The diameter of the deviation, wall roughness, difficult to measure accurately. So the calculation error is great. At present, most countries take calculation as a supplement, and the measurement is the norm. However, due to the actual selection and matching of the capillary, there is still no simple and practical discussion that is applicable to the maintainer in the maintenance work.
How can we repair the refrigerator to achieve the ideal cooling effect? The ordinary freezer circuit is simpler, and the cooling effect is good or bad. The key lies in the pipeline. In the refrigeration pipeline maintenance. The leak, trap, ice blocking and fouling based maintenance maintenance. Only the main difficulty lies in the comprehensive performance and capillary compressor selection, selection. And Freon charging inquiry. This is the three element that makes freezer achieve better cooling effect.
For ease of use, a 2.5MPa pressure gauge can be welded on a dry filter (double head type) on the high side. Then all the welding pipes (ensure no leakage). A 1.5MPa low voltage vacuum welding table in the manhole, open the vacuum gauge valve. Access absolute pressure of dry air or nitrogen 0.1MPa (air standard pressure). Start the freezer. After three minutes. The operation of the compressor refrigeration system exhaust pressure should be 1.18MPa ~ 1.23MPa. According to the theory of capillary length changes in the data. Short capillary, condensation pressure decrease, evaporation pressure riseThe length of capillary condensation pressure increase. Decrease of evaporation pressure. After the theoretical value is reached. A proper amount of Freon can be obtained by evacuating and adding proper amount of freon. This method and data are widely used in 1 / lOHP to L / 2HP refrigeration equipment.
