②The compressor runs without abnormal noise, the compressor discharges a small amount of refrigerant, and the anti-dew tube remains at 1.2 MPa after the pressure is maintained for 24 hours. This shows that the anti-dew tube does not leak, continue Suppress other refrigeration pipelines to check for leaks, and take corresponding measures. If other pipelines are not leaked during inspection, the account is a slight leak in the anti-exposure tube and should be removed.

③ When the compressor is running, there is a vibration of metal sheets, or the refrigerant discharge is large when the process nozzle is opened. The compressor may have poor exhaust performance. Open the compressor exhaust pipe port, plug in the

power supply to run the compressor, and test the suction and exhaust. Normally, the exhaust (high pressure) pipe port cannot be blocked by hand, otherwise it is easy to block, indicating the exhaust Poor performance, replace the compressor of the same model. After finding the fault point of the refrigeration system and repairing it, blow through the system with nitrogen, replace the filter drier, evacuate, and fill the seal with refrigerant.

poor cooling and the compressor has metal plate collision sound failure phenomenon: the cooling is poor, there are abnormal noises when the compressor is running, it sounds like metal plate collision noise. Failure analysis: Most of the internal damage of the compressor causes insufficient exhaust. Troubleshooting: Unplug the power supply, open the compressor process nozzle to vent, and observe the refrigerant discharge. Discharge a lot of refrigerant, mostlyIf the compressor discharge is insufficient, the compressor discharge performance should be tested. You can weld open the compressor exhaust pipe port, insert the power supply to make the compressor run, and press the exhaust pipe port with your thumb. You can also weld a pressure gauge to the discharge pipe and close the valve, plug in the power to make the walk-in cooler compressor run and observe the pressure gauge, when the pressure reaches 2MPa, immediately stop or open the pressure gauge valve, if the pressure gauge is still not up to 1.5MPa, it is necessary to judge the compressor exhaust is insufficient, and replace the compressor of the same model. A small amount of refrigerant is discharged, indicating that there is little cooling in the system. Based on this, it is inferred that there is a leak somewhere in the system. First, the total pressure of the system is 0.8MPa, and the welds of the exposed cold pipelines are checked for leaks with soapy water, and then the high and low pressure pipelines are drilled in sections to check for leaks. If the leak is located, the exposed pipeline is repaired: if the leak is in The anti-dew tube is not used for removal. After finding the system fault point and eliminating it, blow through the system, replace the Torr filter, evacuate, suppress, add refrigerant, and seal.