The main reason why the freezer is not cooling

The main reason why the freezer is not cooling

1. What will happen if sewage treatment is not carried out?

The refrigeration system is a clean, dry and tight closed loop system. Because the passage section of some components in the system is very small (such as the valve cavity of the thermal expansion valve, capillary tube, filter mesh, etc.), if there are mechanical impurities or other dirt in the system, the okmarts.com cold storage will accelerate the friction surface The wear and tear of the system will block the passage, which will affect the normal flow of the refrigerant, and then affect the refrigeration capacity of the refrigerator. In severe cases, the cylinder may be pulled and the machine may be damaged. Therefore, no mechanical impurities and other dirt are allowed in the system. It must be carried out after the system is installed. Sewage (blowing) work. 2. What are the methods for sewage treatment?

Generally, compressed air is used to blow dirt to remove impurities in the system. The specific steps are as follows:

1. The nitrogen in the cylinder is directly charged into the system from the low pressure end of the refrigeration compressor. When the nitrogen pressure in the cylinder is high, the pressure reducing valve should be connected when filling, and the pressure should be reduced to 0.5~0.6MP before filling the system.

2. When a solenoid valve is installed before the expansion valve, the solenoid valve should be opened first, otherwise nitrogen cannot enter the high-pressure system. If the compressor uses compressed air to blow the dirt, the compressor's discharge temperature should not exceed 130°C, otherwise it must be shut down and restarted after the temperature drops.

3. For larger systems, in order to reduce gas flow resistance and gas flow, the blowdown can be carried out in stages. The cold storage drain outlet is set at the lowest point of the pipeline or equipment, and the drain must be repeated several times until the gas discharged from the drain outlet is blown on the hard board with white paper or white cloth and there is no obvious stain, then the system can be considered to have been blown clean .

Ozone method. Ozone has a fierce oxidation effect, which not only eliminates the peculiar smell of the freezer warehouse, but also prevents the growth of microorganisms. The ozone generator can be used to remove the peculiar smell of the warehouse.

If the food containing more fat is stored in the freezer, ozone treatment should not be used to avoid fat oxidation and rancidity.

Formaldehyde method. Move the goods out of the freezer warehouse and use 2% formaldehyde solution (ie formalin solution) for disinfection and removal of odors.

Vinegar method. The freezer warehouse where the fish has been stored has a strong fishy smell. It is not suitable to load other foods, and other foods must be completely cleaned to remove the fishy smell. The usual way to remove fishy smell is to use vinegar.

The specific method is as follows: After the fish leaves the freezer, remove the frost layer on the transpiration tube group and keep the warehouse temperature below 50℃, and then use 50-100 grams of vinegar per cubic meter of the freezer warehouse. , Use a sprayer to spray into the warehouse, first close the warehouse door tightly, start the blower intermittently, let the vinegar evaporate and move in the warehouse, so that the vinegar can absorb the fishy smell. It usually takes about 4-24 hours to open the door of the freezer, and the vinegar smell can be blown out of the warehouse after several hours of continuous blowing.