Small cold storage troubleshooting method:
Close the liquid supply main valve and start the compressor operation. When the suction pressure is stable below 0, close the compressor exhaust valve and stop the compressor operation (finished fluorine) at the end of the shutdown. Disassemble the inlet of the expansion valve, take out the filter and clean it, replace it, and replace the infusion drying filter or filter. Check the performance of the infusion solenoid valve and restore it (check the cleaning). Open the exhaust bypass port of the compressor (others are still in the state of receiving fluorine), start the operation, and let the air from the liquid supply main valve to the compressor body be completely withdrawn from the exhaust bypass port, and the suction pressure is stable at 0. When the following vacuum is completed (exhaustion is completed), the exhaust bypass port is closed, the exhaust valve of the compressor and the liquid supply main valve are opened, and the system resumes operation.
If the expansion valve itself works normally, it is only because of the blockage caused by excessive moisture or dirt in the system, causing serious ice blockage or dirty blockage, which makes the system work abnormally. The temperature of the expansion valve advances the liquid pipe to be lower than normal temperature, even Condensation, the valve after the valve has no temperature reaction, the suction pressure of the compressor is below 0, the machine operating temperature and exhaust temperature are high, and even the knocking sound, the cooling temperature does not drop, and the operating conditions are bad.
Excessive moisture in the system is mainly due to the incomplete maintenance vacuum; the leakage causes the low pressure to continue to operate under negative pressure and inhales moisture; the system is left for too long after being disassembled; the resurgence of the parts is sticky; Excess; caused by rupture of the condenser tube of the water-cooled condenser. The reason for excessive system fouling is mainly the precipitation of iron oxides in the tube evaporator and water-cooled condenser and other pollutants in the system with the circulation of the working fluid.
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