Adding method of refrigerant in central air conditioner
【】How to add refrigerant to the central air conditioner, what operating methods do you know? Let’s take a look with the editor today!
1, quantitative fluorine addition
Connect the three-way valve, pressure gauge, fluorine hose, fluorine bottle or vacuum pump to the process port of the three-way shut-off valve. After fluorine is discharged and vacuumed, start to add fluorine slowly. Use a platform scale and other more accurate measuring tools to weigh , When the reduction of fluorine in the fluorine bottle is the standard fluorine addition on the nameplate of the air conditioner, close the valve of the fluorine bottle.
2, measure the current
set the air conditioner in the refrigeration or Operate under the high-speed heating state (the inverter air conditioner is set in the trial operation state). At the process port of the low-pressure shut-off valve, observe the change of the clamp ammeter while adding fluorine. When it is close to the rated operating current value calibrated on the air conditioner nameplate, close the fluorine bottle Valve. At this time, let the air conditioner continue to operate for a period of time. When the room temperature is close to 27°C in the cooling state or the room temperature is close to 20°C in the heating state, consider the factors affecting the rated operating current such as the air temperature of the outdoor unit and the voltage of the grid Fine-tune the amount of fluorine added to reach the rated operating current value to achieve correct fluorine addition. The reason for the fine-tuning is that the rated operating current value calibrated on the air conditioner nameplate is the data tested by the air conditioner manufacturer under the following conditions: cooling state, power supply When the voltage is 220V or 380V, the fan has high-speed wind, the indoor air temperature is 27℃, and the outdoor unit air temperature is 35℃; heating state, the power supply voltage is 220V or 380V, the fan high-speed wind, the indoor air temperature is 20℃, and the outdoor unit air temperature is 7℃. The summary of the fine-tuning data is: in the cooling state, the outdoor unit air temperature is 35 ℃ as the scale, and the outdoor temperature increases or decreases by 1 ℃, and the rated operating current value is increased or decreased by 1.4%; in the heating state, the outdoor unit air The temperature is 7 ℃ as the standard, and the outdoor temperature increases or decreases by 1 ℃, increase or decrease 1% of the rated operating current value; in the cooling or heating state, the rated power supply voltage is 220V or 380V as the standard, and the power supply voltage rises or Reduce 1V, reduce or increase the rated operating current value.
3, pressure measurement method
put the air conditioner in a cooling high-speed wind state (in winter, when heating needs to add fluorine, the air conditioner Set in the forced refrigeration state or place the room temperature sensor in warm water at about 27°C to simulate the summer temperature to keep the air conditioner in a cooling state). At the process port of the low-pressure shut-off valve, observe the low-pressure pressure of the vacuum pressure gauge while adding fluorine. The low pressure is 0.49MPa (summer) or 0.25MPa (winter), and the valve of the fluorine bottle is closed. Then consider the factors that affect the low pressure pressure such as the temperature of the outdoor unit air temperature and the size of the indoor cooling load, and fine-tune the amount of freon and the gauge pressure to achieve the correct increase Fluorine. The reason for fine-tuning 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; the fluorination process port and surrounding pipelines are installed outdoors, and their pressure and evaporation temperature are affected. The outside temperature has a great influence. The actual pressure and evaporation temperature of the indoor heat exchanger should be higher in summer and lower in winter. The fan has high-speed wind and the indoor temperature is 27°C. The low-pressure pressure data is shown in the attached table.
4. Observation method
Set the air conditioner to cooling or heating high-speed wind When operating in the state, when the amount of fluorine is correct, the temperature difference between the inlet and outlet of the indoor heat exchanger is 10cm: greater than 12°C during cooling, greater than 16°C during heating; during cooling, all the indoor heat exchangers are condensed and the evaporating sound is average Low depression, condensation at the outdoor shut-off valve, continuous dripping in summer, no frost or dew at the junction of the indoor heat exchanger and the capillary tube, etc.; when heating, the wall temperature of the indoor heat exchanger is greater than 40°C.
In actual maintenance, when the inverter air conditioner has a high requirement for the correctness of the amount of fluoride, or the fixed frequency air conditioner needs to be vacuumed due to the refrigeration pipeline system, the quantitative fluoride method should be adopted. When the system needs to be supplemented with fluorine, it is advisable to use the method of measuring current as the main, measuring gauge pressure as the supplement, and taking into account the observation.
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