The laboratory explosion-proof refrigerator is an indispensable instrument for storing refrigeration, low temperature and constant temperature items in scientific research laboratories. It is widely used. In the process of use, it is inevitable that some faults will occur. At this time, the operator needs to understand some basic methods for troubleshooting faults. The following is summarized as "four look":
1 Look at the frost on the surface of the evaporator. If the surface of the evaporator is unevenly frosted or the frost is not all, the refrigerant in the refrigeration system is insufficient and there is a leak point. If the frost layer on the surface of the evaporator is too thick, defrost or reset the defrost time.
2 Look at the cooling rate of the freezer. If the cooling rate is significantly lower than the original normal operation, it is because the electric explosion-proof refrigerator door is not closed tightly (the magnetic sealing strip is aging or damaged), the refrigerant system lacks refrigerant, the condenser surface is too gray or the evaporator table The layer of cream is too thick. These will make the compressor work for a long time and the temperature will drop very slowly.
3 Look at the outer surface of the refrigeration system (especially the joints and evaporator surfaces). If the outer surface of the refrigeration system has oil stains, it indicates that there is leakage. If it is light, the cooling capacity will be reduced. On the surface of the evaporator, uneven or incomplete frosting will occur. In severe cases, the refrigeration system will completely lose its cooling capacity.
4 Look at the suction line on the compressor. If there is frost or condensation on the gas pipeline, it may be excessive refrigerant charge, or the evaporator frost layer is too thick, so that the refrigerant liquid can not be vaporized well in the evaporator and reach the suction pipeline to further absorb heat. Frosting and condensation. In severe cases, frosting and condensation can occur on the compressor.