First, the compressor load is too large, overcurrent operation. Maybe the factors are: cooling water temperature is too high, refrigerant charging too much or refrigeration system air and other non-condensable gases, resulting in a large compressor load, manifested as overcurrent, accompanied by high-pressure problems.
Secondly, electrical problems form low-temperature freezer compressor overcurrent operation. Such as three-phase power supply voltage is too low or three-phase imbalance, resulting in current or a phase current is too large; communication contactor damage, contact erosion, resulting in contact with the current is too large or due to the lack of phase and current is too large.
Third, the overheating maintenance module of the cryogenic freezer is damp or damaged, and the center relay is damaged and the contacts are bad. Table! Appears to be the boot that presents overheating problems, the compressor can not start.
Refrigeration system a lot of refrigerant and compressor refrigeration oil has a certain solubility, when the refrigeration system stops 1, there is a certain pressure in the system, a considerable portion of the refrigerant will be dissolved in the refrigeration oil, the amount of dissolved with the increase in pressure, with the increase in temperature and decrease.
If there are no measures to start the compressor crankcase when the pressure is reduced, a large amount of refrigerant will boil from the oil, so that the oil produces foam, the compressor is sucked in, compressed, discharged, the result is a compressor liquid shock or oil shortage
In order to avoid this situation, the unit should be energized 8 hours before start-up when it is not started for a long time, the heating works automatically after the unit is energized, and the oil heating stops automatically when the refrigerator is running. If the unit is not turned on regularly, it is OK as long as the unit is not energized.
Post time: Jun-27-2024
