The refrigeration and heating circulator needs to be adjusted reasonably during operation.When the expansion valve of the refrigeration and heating circulation machine fails, it needs to be carefully investigated and resolved in time.When the refrigeration and heating circulator contains water, the amount of refrigerant dissolved has a lot to do with the temperature of the refrigerant.The higher the temperature, the greater the amount of dissolved refrigerant, and the lower the temperature of the dissolved refrigerant.After the refrigerant liquid with a condensing temperature of about 30t flows into the throttle hole of the expansion valve, it is immediately cooled to the saturation temperature under the evaporation pressure, and the excess water is discharged. If the partial evaporation temperature attached to the valve hole is lower than 0℃, a layer of ice will form. When the ice layer increases, the valve hole will be clogged.

After a period of normal operation, the suction pressure drops sharply to a negative pressure, that is, a vacuum state, the temperature rises, the frost melts, and the sound of the expansion valve flowing cannot be heard.At this time, it is basically possible to judge whether the valve hole is frozen or blocked by oil.In order to further confirm whether the valve hole of the heating and cooling circulation all-in-one machine is clogged, the expansion valve body can be heated with an alcohol lamp.Do not stop the device from running.After heating for a minute or two, if you hear the sound of gas flowing, you can hear a squeak, the suction pressure returns to normal, and the outlet of the expansion valve begins to work normally again, indicating that the valve hole is indeed blocked by ice or oil.

The inlet of the expansion valve of the refrigeration and heating circulation all-in-one machine is blocked by a filter screen, which can filter impurities and dirt so that the valve hole is not clogged.When tapping with a wrench at the inlet of the valve body, most of the meshes of the filter are not smooth enough, or even completely clogged.If you hear a louder sound than the original sound, make sure that most of the grid is not smooth, or even completely clogged.If the hot and cold synthesizer starts to operate under vacuum, the temperature cannot drop, and there is no sound of air flow in the expansion valve.Remove the expansion valve and remove the filter interface.If it is clogged, the valve hole cannot be opened and the temperature cannot drop.Once the expansion valve of the hot and cold air conditioner fails, if it is not repaired in time, the expansion valve should be replaced immediately so as not to affect the use of the refrigeration and heating circulation all-in-one machine.