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What are the fault diagnosis methods for commercial refrigeration
commercial refrigeration fault diagnosis methods
commercial refrigeration refrigeration status commercial refrigeration failure judgment is actually a process of comparing normal working conditions with actual commercial refrigeration working conditions. By comparing and analyzing the cause of the difference, the specific fault can be determined. commercial refrigeration is a thermal energy conversion system. Therefore, the analysis of the entire thermal process of the refrigeration system and the thermal state of each part, together with electrical parameters, constitutes the basic means for analyzing and judging whether the commercial refrigeration is working properly
. Commercial refrigeration fault diagnosis is actually carried out by watching, listening, and touching 80%, and 20% need to use tools to detect or verify. Seeing, listening, and touching are all based on feeling, and there is no quantification at all. Therefore, it is necessary to clarify the performance of commercial refrigeration in all aspects before overhauling.
commercial refrigeration normal conditions commercial refrigeration normal conditions can be expressed by compressor operation and return pipe temperature, condenser heating temperature area, and evaporator surface frosting.
①When the compressor is running, you can hear a uniform running sound and a slight vibration, and it feels hot to touch the shell. The low-pressure suction pipe (commonly known as the return pipe) is close to room temperature or has a cool sensation.
② The starting current of commercial refrigeration is 6A~20A (usually around 10A), and the operating current is 0.8A^1.4A (usually around 1A). The indirect commercial refrigeration defrosting current is about 0.8A.
③The temperature of the condenser changes uniformly from high to low from the inlet to the outlet. In summer, the area of the condenser has heat above 2/3; in winter, the area of the condenser above 1/2 has heat.
④The surface temperature of the evaporator, about 10 minutes after starting, the freezer compartment evaporator can feel cold or frost; about 30 minutes after starting, the freezer compartment should be frosted or sticky with wet hands, and the refrigerator evaporator should feel cool. After 2 hours, the evaporator had even and firm frosting.
⑤Open the freezer door, you can hear it near the evaporatorThe sound of hissing flow of refrigerant after capillary throttling.
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