supermarket refrigerated showcase » article > display freezer > Maintenance display cases Ten taboos (four)
Maintenance display cases Ten taboos (four)
Maintenance display cases Ten taboos
Do not empty the filling pipe before filling the refrigerant. After the refrigeration system is repaired and evacuated, the air in the filling pipe must be discharged after the refrigerant is filled. Otherwise, the air in the filling pipe will flow into the refrigeration system, resulting in high noise and poor cooling. The method of emptying the filling pipe is: firstly connect the filling pipe and the refrigerant, and then connect the filling pipe to the pressure gauge fixed on the compressor, but cannot tighten it. Open the refrigerant valve with the right hand. After hearing the gas discharge sound (The air inside is exhausted) Once the filling pipe is tightened immediately. Example 5: A certain display case repairs the refrigeration system due to external leakage, and directly fills the refrigerant in the filling pipe after being evacuated, so that the display cases have poor refrigeration and the condenser temperature cannot change uniformly. This is because there is air in the refrigeration system Typical performance. [Note] There is air in the refrigeration pipe. Because the air is a non-condensable gas, it obstructs the flow of refrigerant, affects the refrigeration effect, and makes noise.
Avoid using R134a refrigerant system for too long opening time. Because this display cases compressor uses vinegar oil, which has strong water absorption, and mixing with air, water, and minerals will reduce stability. Therefore, when repairing the refrigeration pipeline of the R134a refrigerant model, the opening time should be short (not more than 30 minutes). If necessary, seal the nozzle to avoid malfunctions such as ice blockage, which may lead to secondary repairs.
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