Several methods of adding refrigerant to household central air-conditioning
【】To add refrigerant to the central air conditioner, what do you all know about how to operate it? Let’s take a look with the editor today! 1. Observation method
Set the air conditioner to operate under high-speed cooling or heating. When the amount of fluorine is correct, the temperature difference between the inlet and outlet of the indoor heat exchanger is 10cm: when cooling is greater than 12℃, When heating, it is more than 16℃; when cooling, all indoor heat exchangers are condensed, the evaporating sound is averagely low, the outdoor shut-off valve is condensed, the condensation drips continuously in summer, and the connection between the indoor heat exchanger and the capillary tube is free of frost or dew, etc. ; When heating, the wall temperature of the indoor heat exchanger is greater than 40°C. In actual maintenance, when the frequency conversion air conditioner has a high requirement for the accuracy of the fluorine addition, or the fixed frequency air conditioner needs to be vacuumed due to the refrigeration piping system, the quantitative fluoride method should be adopted. Adopt the method of measuring current as the main, measuring gauge pressure as the supplement, and taking into account the observation. 2. Quantitatively add fluorine to the process port of the three-way shut-off valve to connect the three-way valve, pressure gauge, fluorine hose, fluorine bottle or vacuum pump, etc. After fluorine is discharged and vacuumed, start to add fluorine slowly. Use a platform scale to measure more accurately The tool is weighed. When the reduced amount of fluorine in the fluorine bottle is the standard fluoride added on the nameplate of the air conditioner, the fluorine bottle valve is closed. Baidu Ansheng HVAC, 20 years of service experience, Hunan residential water system central air-conditioning professional leader
3, measuring current
set the air conditioner in the cooling or heating high-speed wind state ( The inverter air conditioner is set to run under the test 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 continues to operate for a period of time. When the room temperature is close to 27°C in the cooling state or 20°C in the heating state, the factors that affect the rated operating current such as the air temperature of the outdoor unit and the voltage of the power grid are considered, and the amount of fluorine added is fine-tuned. It reaches the rated working current value, and the fluorine is added correctly. The reason for the fine-tuning is that the rated working current value calibrated on the air conditioner nameplate is the data tested by the air conditioner manufacturer under the following conditions: cooling state, the power supply voltage is 220V or 380V when the fan High-speed wind, indoor air temperature 27℃, outdoor unit air temperature 35℃; heating state, power supply voltage 220V or 380V fan high-speed wind, indoor air temperature 20℃, outdoor unit air temperature 7℃. The fine-tuning data summarized in practice are: 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 temperature is 7℃ as the scale. When the outdoor temperature increases or decreases by 1°C, the rated operating current value is increased or decreased by 1%; in the cooling or heating state, the rated power supply voltage is 220V or 380V, and the power supply voltage is increased or decreased by 1V, decreased or increased Rated operating current value.
4, pressure measurement method
put the air conditioner in the cooling high-speed wind state (in winter, when heating needs fluorine, set the air conditioner in the forced cooling state or place the room temperature sensor Operate in warm water at about 27℃, simulate summer temperature to keep the air conditioner in a cooling state), and observe the low pressure of the vacuum pressure gauge while adding fluorine at the process port of the low pressure shut-off valve. When the low pressure is 0.49MPa (summer) or 0.25MPa ( In winter), close the valve of the fluorine bottle. Then consider the factors that affect the low pressure pressure such as the air temperature of the outdoor unit, the size of the indoor cooling load, etc., fine-tune the amount of freon and the gauge pressure to achieve correct fluorine addition. The reason for the fine-tuning is due to the low pressure and The indoor cooling load is directly proportional, that is, the greater the cooling load, the higher the pressure, and vice versa; the fluorination process port and surrounding pipes are installed outdoors, and their pressure and evaporation temperature are greatly affected by the outside air temperature. The actual indoor heat exchanger The pressure and evaporating temperature should be higher in summer and lower in winter. In practice, when the fan has high-speed wind and the indoor temperature is 27℃, the low-pressure pressure data is shown in the attached table.
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