supermarket refrigerated showcase » article > display refrigerator > Commercial refrigeration's one point, two listening, three watching, four touches, five releases and six tests (2)
Commercial refrigeration's one point, two listening, three watching, four touches, five releases and six tests (2)
Oil stains, damp dust, black welding joints, 90% of which are leaks, leaking refrigerant. The side of the freezer compartment of the middle door frame is corroded, and 90% is the leakage of the anti-exposure pipe in the door frame of the commercial refrigeration body, which leaks the refrigerant. 80% of the capillary tube is frosted and blocked by ice or dirt. The compressor return pipe is frosted, and 100% is the excess refrigerant added during maintenance.
Touch the condenser and exhaust pipe temperature, touch the condenser temperature, the compressor exhaust pipe temperature, and determine the type and location of the fault. The condenser is hot locally, and the temperature changes unevenly. 100% is because the refrigeration system is exhausted. The compressor exhaust pipe is overheated, 90% of the system is blocked, and 100% of the blockage occurs in a certain part of the capillary tube.
air bleeding knows the amount of refrigerant or compressor exhaust. On the basis of the above diagnosis results, the refrigeration system is purposely opened to bleed, and the fault is further proved through the bleed condition. When the refrigeration system is initially diagnosed as leaking, unplug the power supply and cut the compressor process tube to deflate. The gas displacement is small, which proves that there is less refrigerant in the refrigeration system. For a machine with a failure, it should be judged that the refrigeration system is leaking: for a second failure, in addition to the system leakage, it may also be insufficient refrigerant. When the compressor is initially diagnosed as non-venting or poorly exhausted, plug in the commercial refrigeration power supply and run the compressor for 10-20 minutes, keep the compressor running, open the compressor process tube to bleed, and if a large amount of gas is discharged, the compression is proved The machine does not exhaust or the exhaust is poor. When initially diagnosing that the refrigeration system is blocked, stop for a period of time and then connect the power supply to make the compression operation, and open the capillary. If a certain port of the capillary is not exhausted or the gas discharged intermittently after being opened, it proves that the refrigeration system is indeed blocked and which port of the capillary does not exhaust. Or the exhaust is not smooth, indicating that the clogged part is on this side of the capillary.
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