First, how to add refrigerant to the air conditioner
1. Add refrigerant quantitatively: connect a three-way valve, a pressure gauge, a fluorine hose, a fluorine bottle or a vacuum pump to the process port of the three-way stop valve. After releasing fluorine and vacuumizing, add fluorine slowly. Weigh with platform scales and other measuring tools. When the fluorine reduction in the fluorine bottle is equal to the standard fluorine addition on the nameplate of the air conditioner, close the valve of the fluorine bottle.
2. Pressure measuring method: put the air conditioner in the state of refrigeration and high-speed wind (when fluoride is needed for heating in winter, set the air conditioner in the state of forced refrigeration or put the room temperature sensor in warm water of about 27℃ to simulate the summer temperature, so that the air conditioner is in the state of refrigeration), observe the low pressure of the vacuum pressure gauge while adding fluoride to the process port of the low-pressure stop valve, and close the fluorine bottle valve when the low pressure is 0.49MPa (summer) or 0.25MPa (winter). Then, considering the outdoor air temperature, indoor cooling load and other factors that affect the low pressure, fine-tune the freon dosage and gauge pressure to realize accurate fluorine addition. The reason for fine adjustment is that the low pressure is proportional to the indoor cooling load, that is, the greater the cooling load, the higher the pressure, and vice versa; Because it is installed outdoors, the pressure and evaporation temperature of the fluorination process port and nearby pipelines are greatly influenced by the external air temperature. The actual pressure and evaporation temperature of indoor heat exchanger are higher in summer and lower in winter. In the case of high-speed fan wind and indoor temperature of 27℃, the low-pressure data summarized in practice are shown in the table below.
3. Current measurement method: set the air conditioner in the cooling or heating high-speed wind state (the variable frequency air conditioner is set in the trial operation state), observe the change of the clamp ammeter while adding fluorine to the process port of the low-pressure cut-off valve, and close the fluorine bottle valve when it approaches the rated working current value calibrated by the air conditioner nameplate.
At this time, let the air conditioner continue to run for a while. When the room temperature is close to 27℃ in the cooling state or 20℃ in the heating state, the factors that affect the rated working current, such as outdoor air temperature and grid voltage, are taken into account, and the fluorine addition amount is finely adjusted to reach the rated working current value, so as to realize accurate fluorine addition. The reason for fine-tuning is that the rated working current calibrated by the air-conditioning nameplate is the data tested by the air-conditioning manufacturer under the following working conditions: cooling state, high-speed fan wind with power supply voltage of 220V or 380V, indoor air temperature of 27℃, outdoor air temperature of 35℃; In the heating state, when the power supply voltage is 220V or 380V, the fan blows at high speed, and the indoor air temperature is 20℃ and the outdoor air temperature is 7℃.
4. Inspection method: set the air conditioner to run in the state of high-speed wind for cooling or heating, and the temperature difference of 250px between the inlet and outlet of the indoor heat exchanger is: greater than 12℃ for cooling and greater than16℃ for heating; During refrigeration, the indoor heat exchanger is completely dewed, the evaporation sound is even and low, the outdoor cut-off valve is dewed, the condensate drops continuously in summer, and there is no frosting dew at the joint between the indoor heat exchanger and the capillary. When heating, the wall temperature of indoor heat exchanger is greater than 40℃.
Second, what kinds of refrigerants are there?
1, freon 12( CF 2Cl2) code R 12 freon 12 is a colorless, odorless, transparent and almost nontoxic refrigerant, but when the air content exceeds 80%, it will cause suffocation. Freon 12 will not burn or explode. Hydrogen fluoride, hydrogen chloride and phosgene (COCl2 _ 2) harmful to human body can be decomposed when exposed to naked flame or when the temperature reaches above 400℃. R 12 is a widely used medium-temperature refrigerant, which is suitable for small and medium-sized refrigeration systems, such as refrigerators and freezers. R 12 can dissolve a variety of organic substances, so ordinary rubber gaskets (rings) cannot be used, and chloroprene rubber or nitrile rubber sheets or sealing rings are generally used.
2. Freon 22(CHF2Cl) code R22R22 is neither flammable nor explosive, and its toxicity is slightly higher than that of R 12. Although the solubility of water is greater than R 12, it may still lead to the occurrence of refrigeration system. Ice jam? Phenomenon. R22 can be partially dissolved with lubricating oil, and its solubility varies with the type and temperature of lubricating oil, so the refrigeration system using R22 must have oil return measures.
3. The evaporation temperature of 3.R22 at standard atmospheric pressure is -40.8℃, and the condensation pressure at room temperature is not more than 15.68? 105Pa, and the refrigerating capacity per unit volume is more than 60% higher than that of R 12. R22 refrigerant is mainly used in air conditioning equipment.
That's all about how to add refrigerant to air conditioners and the types of refrigerants introduced to you today. After reading this article, will you add refrigerant to the air conditioner I hope the above article can help everyone. If you still want to know the relevant knowledge, you can continue to pay attention to our website.