What are the causes of aircon evaporator freezing?

For the first phenomenon, the failure is mainly caused by too little refrigerant. As we all know, for ordinary air conditioners, capillary throttling is adopted, which is constant, that is, the pressure behind the capillary is affected by the condensation pressure in front of the capillary. In the absence of refrigerant, the pressure behind the capillary decreases due to the reduced condensation pressure, and the lower the throttle size, the lower the pressure can provide the lower the evaporation pressure.

The smaller the liquid supply, the lower the evaporation temperature, and the smaller the refrigeration capacity, so that the capillary will freeze at the evaporator inlet, and then more and more, and the evaporation temperature will become less and less, so that a vicious circle is formed, and the frozen part is closer and closer to the evaporator outlet. This often happens because the indoor tube temperature is at the outlet of the room exchanger, and the return gas superheat will increase due to the small amount of liquid supply, so the supercooling protection that should have worked does not work! Of course, if the shortage of refrigerant reaches a certain point, it will not freeze, but will simply turn into superheated steam!

Some can also be caused by clogged capillaries, but they are rare.

Evaporator icing is mainly caused by insufficient refrigerant, low compressor efficiency, and excessive refrigerant.

If the refrigerant is insufficient, the split air conditioner will leak or leak the refrigerant due to the installation or use time for a long time. When the refrigerant in the refrigeration system is reduced, the evaporation pressure is too low, causing the evaporator to freeze. The compressor efficiency is low, the compressor fails for a long time, the compressor compression efficiency is reduced, or the compressor gas distribution system is damaged, causing the pressure to be too low and freeze.

There is too much refrigerant, and some air conditioners re-inject refrigerant due to displacement, leakage, etc. The maintenance personnel improperly added more refrigerant, causing too much refrigerant to flow to the evaporator and partially evaporate and freeze.

Common causes of frosting or even freezing of evaporators;

1.Insufficient refrigerant.

2.The system is slightly clogged.

3.The evaporator is too dirty.

Summary. What is the reason for the old freezing of the air conditioner evaporation tank? Hello dear, the reason for the icing of the air conditioner evaporator:

1. Refrigeration frostingRefrigeration frosting is located in the evaporator of the indoor unit. When refrigerating, the outdoor unit dissipates heat, the indoor unit absorbs heat, the purpose of the evaporator is to absorb heat (cooling), and the absorption of heat requires air circulation, and the conduction of air is used to take away the heat, when the air circulation is insufficient, the evaporator will frost. The reason for the lack of air is often that the filter screen is not cleaned or the heat sink of the evaporator is not cleaned, which hinders the air flow.

2. Heating and frosting is located on the evaporator of the outdoor unit, when the heating mode is turned on, the outdoor unit absorbs heat and the indoor unit dissipates heat. When the heating mode is activated, the outdoor temperature is below 10 degrees, the outdoor temperature is low, and the outdoor unit still needs to absorb heat, the temperature of the evaporator body will drop to below 0 degrees, and the surrounding moisture (similar to dehumidification during refrigeration) will soon condense into frost. Hope it helps.

I wish you good health and a happy life!

What is the reason for the old freezing of the air conditioner evaporation tank? Hello dear, the reasons for the freezing of the air conditioner evaporator: 1. Refrigeration frosting Refrigeration frosting is located in the evaporator of the indoor unit.

When refrigerating, the outdoor unit dissipates heat, the indoor unit absorbs heat, the purpose of the evaporator is to absorb heat (cooling), and the absorption of heat requires air circulation, and the conduction of air is used to take away the heat, when the air circulation is insufficient, the evaporator will frost. The reason for the lack of air is often that the filter is not cleaned or the heat sink of the evaporator is not cleaned, which hinders the air flow. 2. Heating and frosting is located on the evaporator of the outdoor unit, when the heating mode is turned on, the outdoor unit absorbs heat and the indoor unit dissipates heat.

When the heating mode is activated, the outdoor temperature is below 10 degrees, the outdoor temperature is low, and when the outdoor unit still needs to absorb heat and roll bright, the temperature of the evaporator body will drop to below 0 degrees, and the surrounding moisture (similar to dehumidification during refrigeration) will soon condense into frost. Hope it helps. I wish you good health and a happy life!

Hello dear, under normal circumstances, the evaporator is shouting that the key can not be frosted. After frosting, it affects heat transfer, increases thermal resistance, reduces the refrigeration effect and the amount of wind cracking shed, so the evaporator can only condense dew. The causes of frosting are that the adjustment of the expansion valve is too small, the low pressure is too low or the system refrigerant is too little, and the evaporation pressure is too low.

1. Insufficient or too much refrigerant in the air conditioner:

In the case of air conditioners, if the refrigerant is insufficient, the pressure of the evaporator may be too low and freeze, so only enough refrigerant needs to be added to it. If there is too much refrigerant inside the air conditioner, it may also cause the air conditioner to freeze. Because too much refrigerant may flow to the air conditioner's evaporator, causing it to freeze.

Solution: Ask a professional to treat the fluoride discharge of the air conditioner.

2. The thermostat of the air conditioner is faulty

A faulty thermostat of an aircon can also cause the aircon to freeze.

Solution: Replace the air conditioner thermostat.

3. The evaporator of the air conditioner is dirty

If the air conditioner is not cleaned for a long time, it may lead to a decrease in the heat exchange of the evaporator of the air conditioner, resulting in the evaporator temperature being too low and freezing.

Solution: Clean the air conditioner regularly.

4. Air conditioning compressor failure:

If the compressor is used for too long, there is a possibility that the compressor will be damaged or the power will be reduced, which will cause the inside of the air conditioner to freeze.

Solution: Add refrigerant to the compressor to see if it can be solved, if it is not handled well, you can only replace the air conditioning compressor.

1. It may be that the refrigerant of the air conditioner is insufficient or too much: The lack of refrigerant of the air conditioner may cause the pressure of the evaporator to be too low, thus freezing, and only enough refrigerant needs to be added to it. On the contrary, if there is too much refrigerant in the air conditioner, too much refrigerant will flow to the evaporator of the air conditioner and cause it to freeze, and the air conditioner needs to be treated to release fluorine.

2. It may be the evaporator of the air conditioner that is dirty: If the air conditioner is not cleaned for a long time, it may lead to a decrease in the heat exchange of the evaporator of the air conditioner, resulting in the evaporator temperature being too low and freezing. Therefore, it is necessary to clean the air conditioner, and then keep the air conditioner cleaned regularly.

3. It may be the compressor failure of the air conditioner: The compressor may be damaged or the power will be reduced if it is used for too long, resulting in the freezing of the air conditioner. It is necessary to add refrigerant to the compressor to see if it can be solved, and if it is not handled well, the air conditioner compressor can only be replaced.

4. It may be that there is a problem with the throttle valve of the air conditioner: if the cooling capacity and temperature setting of the air conditioner are displayed normally, but the temperature of the air outlet on the side is not detected, it is likely that there is a problem with the throttle valve. You can clean the filter screen of the inner unit and increase the operating temperature of the air conditioner, which can speed up the defrosting of the air conditioner.

First, the net is too dirty. Second, the capacitance failure of the fan or fan makes the speed of the internal fan too low. Third, the working environment is too dirty (restaurant or factory mine) so that the evaporator is too dirty and not ventilated. Fourth, the system lacks refrigeration. Fifth, the system is blocked.

There are several reasons for icing in the internal machine, please check step by step. First, the net is too dirty. Second, the capacitance failure of the fan or fan makes the speed of the internal fan too low.

Third, the working environment is too dirty (restaurant or factory mine) so that the evaporator is too dirty and not ventilated. Fourth, the system lacks refrigeration. Fifth, the system is blocked.

There are two situations in which the evaporator of the air conditioner freezes: 1. The net is too dirty, the evaporator is blocked, and the wind speed is too small, resulting in the cold air emitting no ice; 2. The system lacks refrigerant and freezes.

Insufficient refrigerant causes the evaporation pressure to drop and freeze.

Wash the filter and add some freon.