supermarket refrigerated showcase » article > display freezer > display cases Failure analysis and treatment of refrigeration equipment (3)
display cases Failure analysis and treatment of refrigeration equipment (3)
display cases Failure analysis and treatment of refrigeration equipment (3)
(9) The liquid level of the accumulator is not lower than 1/3 of the liquid level indicator. The oil level of the crankcase should not be lower than the horizontal center line of the indicator window (if it is two oil level indicator windows, the oil level should be between the center lines of the two glasses).
(10) The automatic return pipe of the fluorine oil separator is normal when it is cold and hot, and the hot and cold cycle is about 1 hour. display cases There should be no obvious temperature difference before and after the filter of the liquid pipeline, let alone frosting, otherwise it will be blocked. The cylinder head of the fluorine refrigerator should be half cold and half hot. The joints of the fluorine system should not leak oil, which indicates fluorine leakage. There should be no obvious ammonia leakage in the valves and connections of the ammonia system.
(11) When touching the horizontal condenser by hand during operation, the upper part should be hot and the lower part should be cool, and the junction of cold and hot should be the refrigerant liquid level. The oil separator is not too hot in the upper part and the lower part, and the oil level or liquid level is at the junction of hot and cold. The end of the safety valve or bypass valve of the refrigerator connected to the low pressure should be cold. If it is not cold, it means high and low pressure blow-by.
(12) During operation, the vapor pressure should be similar to the suction pressure. The discharge pressure of the high-pressure side should be similar to the condensing pressure and the pressure of the accumulator. If not, it is abnormal.
(13) Under a certain water flow, there should be a temperature difference between the cooling water in and out. If there is no temperature difference or the temperature difference is very small, it means that the heat transfer surface of the heat transfer equipment is dirty and needs to be stopped for cleaning.
(14) display cases The refrigerator itself should be sealed, and no refrigerant or lubricating oil should leak. For the shaft seal, when the standard cold output is not more than 1.26Xl05kJ/h, the shaft seal is allowed to have a small amount of oil leakage: the refrigerator with the standard cold output greater than 1.26Xl05kJ/n must not have more than 10 drops of oil per hour. No oil drips on the shaft seal of the fluorine refrigerator.
(15) The temperature of the shaft seal and bearing of the refrigerator does not exceed 79°C.
(16) The expansion valve body is frosted or evenly condensed, but thick frost should not appear at the inlet. When the fluid passes through the expansion valve, only a dull, small sound can be heard.
(17) The pointers of the pressure gauges in the system should be relatively stable, and the thermometer indications are correct.
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