准确加氟的依据和方法

The basis and method of accurate fluoridation

1.定量加氟：在三通截止阀工艺口连接好三通阀、压力表、加氟软管、氟瓶或真空泵等。放氟抽真空后，开始慢慢加氟。用台秤等较精确的计量工具称重，当氟瓶内氟的减少量等于空调铭牌上的标准加氟量时，关闭氟瓶阀门。

1. Quantitative fluorination: Connect the three-way valve, pressure gauge, fluoride hose, fluorine bottle or vacuum pump at the process port of the three-way globe valve. After vacuum, the fluorine is gradually added. Weighing with more accurate measuring tools such as table scales, when the reduction of fluorine in fluorine bottles is equal to the standard amount of fluorine added on the air-conditioning nameplate, close the fluorine bottle valve.

2.测电流：将空调设置于制冷或制热高速风状态(变频空调设置于试运转状态)下运转，在低压截止阀工艺口处，边加氟边观察钳形电流表变化，当接近空调铭牌标定的额定工作电流值时，关闭氟瓶阀门。此时，让空调继续运转一段时间，当制冷状态下室温接近27℃或制热状态下室温接近20℃时，再考虑室外机空气温度、电网电压高低等影响额定工作电流的因素，同时微调加氟的量使之达到额定工作电流值，做到准确加氟。要进行微调的原因是因为空调铭牌标定的额定工作电流值是空调厂家在以下工况条件测试的数据：制冷状态，电源电压220V或380V时风扇高速风，室内空气温度27℃，室外机空气温度35℃;制热状态，电源电压220V或380V时风扇高速风，室内空气温度20℃，室外机空气温度7℃。

2. Measuring current: Set the air conditioner in the high-speed air condition of refrigeration or heating (the frequency conversion air conditioner is set in the test running state) to operate. At the low-pressure cut-off valve technological port, observe the change of clamp ammeter while adding fluorine. Close the fluorine bottle valve when approaching the rated working current value of the air conditioning nameplate. At this point, let the air conditioning continue to operate for a period of time, when the room temperature under refrigeration is close to 27 65 The reason for fine-tuning is that the rated operating current value of the air-conditioning nameplate is the data tested by the air-conditioning manufacturer under the following operating conditions: cooling state, fan high-speed wind at 220V or 380V power supply voltage, indoor air temperature 27, outdoor air temperature 35, heating state, fan high-speed wind at 220V or 380V power supply voltage The indoor air temperature is 20 degrees, and the outdoor air temperature is 7 degrees.

实践总结的微调数据是：制冷状态下，以室外机空气温度35℃为标准，室外温度每升高或降低1℃，增加或减少额定工作电流值的1.4%;制热状态下，以室外机空气温度7℃为标准，室外温度每升高或降低1℃，增加或减少额定工作电流值的1%;制冷或制热状态下，以额定电源电压220V或380V为标准，电源电压每升高或降低1V，减少或增加额定工作电流值：单相1匹0.025A，1.5匹0.025A×1.5，2匹0.025A×2，3匹0.025A×3;三相3匹0.025A×3/3，5匹0.025A×5/3，10匹0.025A×10/3。  3.测压力法：将空调置于制冷高速风状态(冬天，制热需要加氟时，将空调设置于强制制冷状态或将室温传感器置于27℃左右的温水中，模拟夏天温度让空调处于制冷状态)下运转，在低压截止阀工艺口，边加氟边观察真空压力表的低压压力，当低压在0.49MPa(夏天)或0.25MPa(冬天)，关闭氟瓶阀门。再考虑室外机空气温度高低、室内冷负荷大小等影响低压压力的因素，微调氟利昂的量和表压力，做到准确加氟。进行微调的原因是因为低压力与室内冷负荷成正比，即冷负荷越大，压力越高，反之越低;加氟工艺口及附近管道，因安装在室外，其压力及蒸发温度受外界气温影响很大，室内热交换器实际压力及蒸发温度夏天要偏高一些，冬天要偏低一些。实践中总结的在风扇高速风，室内温度为27℃的情况下，低压压力数据如附表所示。

The fine-tuning data summarized in practice are as follows: under refrigeration condition, with the air temperature of outdoor unit as the standard, the rated working current increases or decreases by 1.4% when the outdoor temperature rises or decreases by 1 C; under heating condition, with the air temperature of outdoor unit as the standard, the rated working electricity increases or decreases by 1 C when the outdoor temperature rises or decreases by 7 C. 1% of current value; under refrigeration or heating conditions, with rated power supply voltage 220V or 380V as the standard, power supply voltage increases or decreases by 1V, reducing or increasing rated working current value: single-phase 1 0.025A, 1.5 0.025A *1.5, 2 0.025A *2, 3 0.025A *3, 5 0.025A *5/3, 10 0.025A *10/3. 3. Pressure measurement method: Put air conditioning in the state of high-speed cooling air (in winter, when heating needs fluoride, air conditioning is set in the state of forced cooling or room temperature sensor is placed in the warm water around 27 degrees Celsius, simulate summer temperature to keep air conditioning in the state of refrigeration), operate under the low-pressure cut-off valve process port, while adding fluorine observe the vacuum pressure gauge. The low pressure pressure, when the low pressure is in 0.49MPa (Xia Tian) or 0.25MPa (winter), close the flask valve. Considering the air temperature of outdoor unit and the cooling load of indoor unit, we can adjust the quantity and pressure of Freon to add fluorine accurately. The reason for fine-tuning is that the low pressure is proportional to the indoor cooling load, that is, the higher the cooling load, the higher the pressure, and the lower the conversely; the pressure and evaporation temperature of the fluoride-adding process outlet and the nearby pipeline are greatly affected by the external temperature because they are installed outdoors, and the actual pressure and evaporation temperature of the indoor heat exchanger are higher in summer than in winter. It's going to be a little lower. In practice, the data of low pressure pressure under the condition of high speed fan and indoor temperature of 27 C are shown in the attached table.

4.观察法：将空调设置在制冷或制热高速风状态下运转，加氟量准确时室内热交换器进、出风口处10cm的温差是：制冷时大于12℃，制热时大于16℃;制冷时，室内热交换器全部结露 、蒸发声均匀低沉、室外截止阀处结露、夏季冷凝滴水连续不断、室内热交换器与毛细管的连接处无霜有露 等;制热时，室内热交换器壁温大于40℃。

4. Observation Method: Set the air conditioner in the condition of high-speed air for refrigeration or heating. The temperature difference of 10 cm at the inlet and outlet of indoor heat exchanger is more than 12 C for refrigeration and 16 C for heating when fluorine is added accurately. Continuous condensate drip, indoor heat exchanger and capillary connection without frost and dew, etc. When heating, the wall temperature of indoor heat exchanger is more than 40 degrees Celsius.

在实际维修中，变频空调因对加氟量的准确性要求相当高，或定频空调因制冷管路系统需抽真空时，宜采用定量加氟方法。若管路系统需补充氟时，宜采用以测电流为主、测表压为辅，兼顾观察的方法。

In the actual maintenance, the frequency conversion air conditioner because of the accuracy of fluoride dosage requirements are quite high, or the constant frequency air conditioner because of refrigeration pipeline system vacuum, it is appropriate to use quantitative fluoride method. If the pipeline system needs to be supplemented with fluorine, it is advisable to take the current measurement as the main method and the meter pressure measurement as the auxiliary method, taking into account the observation method.