How to judge whether the central air conditioner needs to add fluoride, a brief specific method

Central air conditioners are mainly used in large public places, such as shopping malls, offices, hotels, etc. At present, household central air conditioners are also widely used, from small apartments to large villas. Now home decoration generally uses DC inverter central air conditioner, which is comfortable and beautiful. So for how to judge whether the central air conditioner is lack of fluoride, and the specific filling method, the editor has prepared ready-made ones for everyone, come and watch together!

Generally, several methods for testing the lack of fluoride in central air conditioning mainly include:

1. The tracheal valve is dry. There is no obvious cooling sensation when touched by hand. The reason is the lack of fluorine, which leads to a decrease in the boiling point of the refrigerant in the evaporator, which increases the heat of the refrigerant in the valve and the temperature of the valve.

2, the liquid pipe valve is frosted. The reason is the lack of fluorine, which causes the pressure in the liquid pipe to drop and the boiling point to drop, making the valve temperature below the freezing point.

3. Open the indoor unit panel and remove the filter, you can find that only a small part of the evaporator is frosted. This is the result of insufficient refrigerant and a corresponding reduction in cooling area.

4. There is no heat in the exhaust air of the outdoor unit. The reason is that the refrigerant is insufficient, which causes the condensation pressure and temperature to decrease.

5. The drainage hose has little or no drainage at all. The reason is that the cooling area of u200bu200bthe evaporator is reduced, the condensation area is also reduced, and the amount of condensed water is reduced.

6. The gas-liquid valve of the outdoor unit is oily. The reason is that the refrigerant and the refrigerating oil have a certain degree of mutual solubility. After the refrigerant overflows from the leakage point, the oil stains adhere to the periphery of the leakage point.

7. The pressure measured from the fluorine filling port of the outdoor unit is lower than 0.45MPa. The reason is that the refrigerant is insufficient, causing the evaporation pressure to drop.

8. If the liquid pipe valve is frosted, it indicates that the fluorine deficiency is serious; only the tracheal valve is frosted, indicating a slight lack of fluorine or the ambient temperature is too low; both valves are frosted, indicating that the system has a secondary joint Flow phenomenon.

9. The air conditioner lacks fluorine. When the air conditioner is working, the power is insufficient, and the cooling effect will decrease, but it does not mean that it will not be cooled. It depends on the specific fluorine deficiency.

So how to fill the lack of refrigerant?

1. Use a new copper tube as a suitable filling connection tube, and use it to connect the filling valve on the system and the joint on the media bottle;

2. When connecting a full bottle of refrigerant with a connecting tube, it should be flushed. The faster the bottle change time is, the better, which can reduce the loss of refrigerant;

3. Take measures to prevent humid air from entering the system during the filling process. ;

4. The charging amount should be correct and appropriate, and the refrigerant level can be seen in the evaporator sight glass;

5. The liquid level should be observed and done after the initial charging of the refrigerant Good record; 　

6. During the process of pumping refrigerant or refrigerant filling, the refrigeration and cooling pumps should be operated to circulate the cooling water and chilled water to prevent the tube bundle from being frozen by the cold liquid and bursting and cracking the copper pipes. When the refrigerant charge is more than 2/3, the host can be turned on and charged during operation;

7. When the pressure and temperature balance between the condenser and the evaporator is reached, check the refrigerant level (this The time is generally 4 hours after the compressor and water pump stop running).

Many people think that Freon must be added once a year. This view is not correct. Air-conditioning with good airtightness will not lose a little Freon for a few years, so there is no need to add it. Freon. Only when the machine starts to show poor cooling effect, do you need to contact maintenance personnel to add some Freon. Don't blindly believe the saying that it must be added once a year. This is totally unscientific.

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