supermarket refrigerated showcase » article > display freezer > display cases Refrigeration failures and maintenance methods (6)
display cases Refrigeration failures and maintenance methods (6)
display cases Refrigeration failures and maintenance methods (6)
Poor cooling but no abnormal appearance. No abnormal appearance, including normal compressor running sound, and no oil stains on the back of the display cases. , In the display cases, there is no corrosion in the evaporator pipes, and there is no rust on the side of the freezer compartment of the middle door frame. During maintenance, observe the refrigerant discharge when the compressor process nozzle is opened, the service life of the display cases, and the model of the display cases. Use the total pressure or section pressure method to check for leaks, and test the compressor discharge performance to identify the fault.
1. Poor refrigeration and discharge of a large amount of refrigerant failure phenomenon: poor refrigeration, unplug the display cases power supply, open the compressor process nozzle to bleed the system, a large amount of refrigerant is discharged. Failure analysis: A large amount of refrigerant is discharged, basically indicating that the refrigeration pipeline does not leak, and 90% of the compressor has poor discharge performance. Troubleshooting: Carry out the following three steps.
①Test the compressor discharge performance. Open the compressor exhaust pipe port, plug in the power supply to make the compressor run, and press the exhaust pipe port with your thumb. If it is easy to hold down, it means that the compressor has poor exhaust performance. You can also weld a pressure gauge at the outlet of the exhaust pipe and close the valve to make the compressor run and observe the pressure gauge value. When it rises to 2MPa, immediately stop or open the pressure gauge valve. If it cannot rise to 1.5MPa, judge the compressor exhaust Poor performance, need to open the shell to repair or replace the compressor of the same model.
② The refrigeration pipeline needs to be checked for leaks, and it is better to use the subsection suppression method.
③After repairing the refrigeration system, blow through the refrigeration system, replace the filter drier, evacuate, add refrigerant, test the machine, and seal. Good, poor refrigeration, low refrigerant amount when venting.
2. Good appearance, poor cooling, low refrigerant quantity when venting. Trouble phenomenon: poor cooling, normal compressor running sound, no oil stains on the refrigeration pipes on the back of the body, no rust on the freezer side of the middle door frame, and evaporator pipes No corrosion is seen in the road. After unplugging the display cases, open the compressor process nozzle to vent, only a small amount of refrigerant is discharged. Failure analysis: The low discharge of bleed refrigerant generally means that there is less refrigerant, that is, there are leaks in the refrigeration system, and the leaks are mostly in the built-in refrigeration pipeline, such as the evaporator in the low-pressure pipeline, and the anti-dew in the high-pressure pipeline tube. Troubleshooting: According to personal maintenance habits, it is more appropriate to suppress and check the leakage of the refrigeration system.
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