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Fluorine-free display cases maintenance points
fluorine-free display cases maintenance points are as follows:
(1) The opening time should be short and the filter must be replaced. The R134a refrigerant compressor uses vinegar oil, which is compatible with water, so it is required The system remains absolutely dry. When the system opening is exposed, the moisture in the air will affect the dryness of the system. Therefore, the system opening time cannot be too long. Generally, the minor repair process of display cases cannot exceed 20 minutes, and the major repair process cannot exceed 50 minutes. As long as the refrigeration system is opened, the filter drier must be replaced, and the package can be opened before replacement.
(2) The system has high vacuum and can use R134a evacuation special method, that is, first evacuate for 60 minutes, run the compressor for 30 minutes, and then evacuate, repeat two or three times. The second evacuation method can also be used. First evacuate for about 5 minutes, charge the system with refrigerant for about 5 minutes, and then perform a second evacuation.
(3) Excessive display cases Refrigerant discharge, if too much refrigerant is added during maintenance, stop for a period of time and wait for the pressure gauge to display a positive value. Do not discharge refrigerant when the compressor is running to prevent air from entering the system under negative pressure.
(4) Ventilation should be good. When R134a refrigerant exceeds a certain concentration in the air, it is irritating to human skin and eyes. Therefore, it is necessary to maintain good ventilation when venting the system.
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