Commercial supermarket commercial refrigeration common failure inspection method
Commercial supermarket commercial refrigeration failure judgment is an important part of supermarket commercial refrigeration maintenance ' generally use one look, two touch, three listen, four test methods to determine the occurrence The location of the fault.
supermarket commercial refrigeration Under normal working conditions, the frosting on the surface of the evaporator should be uniform. Therefore, when judging a supermarket commercial refrigeration failure, you should first check the frosting of the evaporator.
supermarket commercial refrigeration Under normal working conditions, the frosting on the surface of the evaporator should be uniform. Therefore, when judging a supermarket commercial refrigeration failure, you should first check the frosting of the evaporator.
(1) Normally working direct-cooled supermarket commercial refrigeration The surface of the evaporator should have frost and the frost layer should be uniform and thick. If the evaporator is found to be free of frost, or the upper part and the lower part are free of frost, or the frosting is uneven or imaginary Frost and other phenomena indicate that the supermarket commercial refrigeration refrigeration system is not working properly. If there is periodic frost, it means that the refrigeration system contains moisture and ice blockage may occur. If the evaporator still does not form frost after the commercial refrigeration in the supermarket has been working for a long time, it indicates that the refrigeration system may leak.
(2) Observe whether there is frost or condensation on the capillary tube and the dry filter. If there is, it indicates that there is partial blockage. Observe whether there is frost in the suction pipe of the compressor and whether the filter of the box door is partially condensed, so as to determine whether the refrigerant is excessive and whether the anti-dew pipe is faulty. Then observe the refrigeration piping system, mainly to observe whether there are oil traces at the joints of the pipeline. If there are oil traces on the outside of the tube, it means that the refrigerant is leaking. Because the refrigerant has a strong penetrating force and can be miscible with the refrigerant in any ratio, if there are oil traces, it means that there is a refrigerant leak. .
Listen to the operation of commercial refrigeration in supermarkets. When supermarket commercial refrigeration works normally, the compressor will make a faint sound. This is the high-pressure liquid refrigerant enters the low-pressure evaporator through the capillary tube, and the evaporator absorbs heat and cools. Open the door, put your ears on the outside of the evaporator or the box, you can hear the sound of airflow, which shows that the supermarket commercial refrigeration is working normally. The following sounds are abnormal. (1) After turning on the power, you hear the sound of buzzing , indicating that the motorIf it is not started, the supermarket commercial refrigeration power supply should be cut off immediately.
(2) I heard the airflow sound of hissing in the compressor casing. This is the sound of high-pressure gas escaping into the casing after the high-pressure buffer tube in the compressor is broken.
(3) Supermarket commercial refrigeration If the compressor makes an abnormal sound of clang during operation, it means that the hoisting spring in the compressor shell is loose or broken, and the impact sound made after the compressor is tilted.
(4) If you hear the sound of click , this is the impact of metal inside the compressor, and the internal moving parts on the surface collide due to looseness.
(5) If you cannot hear the airflow in the evaporator, it means that the refrigeration system is dirty. Ice block or oil block. If the sound of the airflow is very small, it means that the refrigerant in the supermarket commercial refrigeration has basically been leaked.
touch the relevant parts with your hands to feel the temperature, and you can analyze and judge the fault location. (1) When in Room 300C-, touch the commercial refrigeration power supply of the supermarket and run for 30 minutes, touch the exhaust pipe with your hand, it should be hot. It should feel hot to the touch in winter.
(2) Whether the surface temperature of the condenser is normal by touching it by hand. In supermarket commercial refrigeration, the surface temperature of the condenser is about 55°C during normal and continuous operation. The upper part is hottest, the middle part is hotter, and the lower part is slightly hot. The temperature of the condenser is related to the ambient temperature. The temperature in winter is about 55°C, the upper part is hottest, the middle part is hotter, and the lower part is slightly hotter. Condenser: The temperature is related to the ambient temperature. In winter, the temperature is lower and the condenser temperature is lower: in summer, the temperature is higher and the temperature is higher.
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