Every summer, the use of air conditioning is the most frequent and the failure rate of air conditioning is also the highest, such as the increase of power consumption, poor cooling effect. Air conditioning maintenance, nine out of ten said lack of fluorine, is it true or false? How to judge the lack of fluorine in air conditioning?
Cooling effect
Many people judge the lack of fluorine in air conditioning on the basis that the refrigeration of air conditioning is getting worse. In fact, this is also true. The refrigeration of air conditioning mainly depends on the function of refrigerant. If the refrigerant is insufficient, the refrigeration effect of air conditioning is naturally not good. For example, the preset temperature of the air conditioner is 25 ℃, but the actual temperature is 28 ℃, which is likely to be the lack of fluorine.
Of course, the refrigeration effect is poor, but it may be lack of fluorine, but it is not necessarily lack of fluorine. It is not ruled out that the temperature sensor of the air conditioner is faulty, and there is too much dust on the filter screen that has not been cleaned, so the actual temperature is not consistent with the preset temperature.
External machine status
The operation of the air conditioner is a bit like "heat porter". Under the action of the compressor, the refrigerant passes through the evaporator and condenser to absorb and release heat and circulate continuously.
Under normal circumstances, when the indoor temperature reaches the preset value, the outdoor unit of the air conditioner will shut down (the fan will not turn), and the outdoor unit will restart when the indoor temperature rises; although the external unit of the variable frequency air conditioner will not shut down, it will change the frequency (the fan speed decreases).
Therefore, we can observe the state of the outdoor unit to judge whether the air conditioner is lack of fluorine. If the air conditioner is lack of fluorine, the outdoor unit will not shut down for a long time and will not reduce the speed. The main reason is that the refrigeration effect is too poor to reach the cooling effect, the compressor needs to maintain high-power operation, and the power consumption is also increased.
Joints, pipes of the air conditioner
The refrigerant of the air conditioner is not a consumable. It depends on the function of the compressor and circulates from the liquid state to the gas state, so it will not be reduced under normal conditions. If the air conditioner is lack of fluorine, it will surely leak out in some place. We can check the connector or pipe of the air conditioner to see if there is any damage. Generally, the damaged point will be dirty. Because the refrigerant and the refrigeration oil are mixed, usually they are lubricated by the refrigeration oil, and the fluorine leakage place will surely leak oil.
Valve
The outdoor unit has two valves. The refrigerant of the air conditioner is installed in the valve. The valve is big and small. The big one is the low-pressure valve and the small one is the high-pressure valve. The two valves are respectively connected with a thick and a thin copper pipe, the thick one is the gas pipe, and the thin one is the liquid pipe. When the air conditioner is running, the refrigerant is transported by the copper pipe.
Air conditioning lack of fluorine, the performance of the valve is most obvious: high pressure valve (liquid pipe) valve will frost, because the pressure drops, the boiling point of the refrigerant decreases, the temperature of the valve is lower than the freezing point, boiling in advance to absorb heat, causing frost phenomenon. The valve of low pressure valve (air pipe) is dry and has no obvious cold feeling. Because of the lack of refrigerant, the boiling of evaporator ends ahead of time, and the temperature of valve rises, which exceeds the temperature of outdoor air.
Evaporator, condensate
Open the indoor unit panel and remove the filter screen. If only part of the evaporator is dewed and frosted, it may be because the air conditioner is lack of fluorine. Because of the lack of refrigerant, only part of the evaporator has boiling heat absorption, so only part of the evaporator area is refrigerated.
When the air conditioner is refrigerated, it will produce condensed water. Because the temperature of the evaporator is low, the water vapor in the air will condense into small water droplets when it is cooled. Normally, the condensate will flow to the water collecting tray along the evaporator, and then it will be discharged out of the room through the condensate pipe connected to the water collecting tray. If the air conditioner is short of fluorine, the condensate will be intermittent or even not drained at all. Because the refrigeration area of the evaporator is reduced, the condensate will be less naturally.
Current and refrigerant pressure
Measuring the working current and refrigerant pressure of the air conditioner is the most direct way to judge whether the air conditioner is lack of fluorine. Only professional measuring instruments (ammeter and pressure gauge) are needed. If the air conditioner is short of fluorine, its working current will be less than the rated current, and the pressure measured at the fluorine filling port will be less than 0.45MPa.
Air conditioning "lack of fluorine" and "lack of refrigerant" are the most common problems of air conditioning, but the performance of air conditioning lack of fluorine is not unique, so we should not conclude that air conditioning lack of fluorine from a single performance.
Cooling effect
Many people judge the lack of fluorine in air conditioning on the basis that the refrigeration of air conditioning is getting worse. In fact, this is also true. The refrigeration of air conditioning mainly depends on the function of refrigerant. If the refrigerant is insufficient, the refrigeration effect of air conditioning is naturally not good. For example, the preset temperature of the air conditioner is 25 ℃, but the actual temperature is 28 ℃, which is likely to be the lack of fluorine.
Of course, the refrigeration effect is poor, but it may be lack of fluorine, but it is not necessarily lack of fluorine. It is not ruled out that the temperature sensor of the air conditioner is faulty, and there is too much dust on the filter screen that has not been cleaned, so the actual temperature is not consistent with the preset temperature.
External machine status
The operation of the air conditioner is a bit like "heat porter". Under the action of the compressor, the refrigerant passes through the evaporator and condenser to absorb and release heat and circulate continuously.
Under normal circumstances, when the indoor temperature reaches the preset value, the outdoor unit of the air conditioner will shut down (the fan will not turn), and the outdoor unit will restart when the indoor temperature rises; although the external unit of the variable frequency air conditioner will not shut down, it will change the frequency (the fan speed decreases).
Therefore, we can observe the state of the outdoor unit to judge whether the air conditioner is lack of fluorine. If the air conditioner is lack of fluorine, the outdoor unit will not shut down for a long time and will not reduce the speed. The main reason is that the refrigeration effect is too poor to reach the cooling effect, the compressor needs to maintain high-power operation, and the power consumption is also increased.
Joints, pipes of the air conditioner
The refrigerant of the air conditioner is not a consumable. It depends on the function of the compressor and circulates from the liquid state to the gas state, so it will not be reduced under normal conditions. If the air conditioner is lack of fluorine, it will surely leak out in some place. We can check the connector or pipe of the air conditioner to see if there is any damage. Generally, the damaged point will be dirty. Because the refrigerant and the refrigeration oil are mixed, usually they are lubricated by the refrigeration oil, and the fluorine leakage place will surely leak oil.
Valve
The outdoor unit has two valves. The refrigerant of the air conditioner is installed in the valve. The valve is big and small. The big one is the low-pressure valve and the small one is the high-pressure valve. The two valves are respectively connected with a thick and a thin copper pipe, the thick one is the gas pipe, and the thin one is the liquid pipe. When the air conditioner is running, the refrigerant is transported by the copper pipe.
Air conditioning lack of fluorine, the performance of the valve is most obvious: high pressure valve (liquid pipe) valve will frost, because the pressure drops, the boiling point of the refrigerant decreases, the temperature of the valve is lower than the freezing point, boiling in advance to absorb heat, causing frost phenomenon. The valve of low pressure valve (air pipe) is dry and has no obvious cold feeling. Because of the lack of refrigerant, the boiling of evaporator ends ahead of time, and the temperature of valve rises, which exceeds the temperature of outdoor air.
Evaporator, condensate
Open the indoor unit panel and remove the filter screen. If only part of the evaporator is dewed and frosted, it may be because the air conditioner is lack of fluorine. Because of the lack of refrigerant, only part of the evaporator has boiling heat absorption, so only part of the evaporator area is refrigerated.
When the air conditioner is refrigerated, it will produce condensed water. Because the temperature of the evaporator is low, the water vapor in the air will condense into small water droplets when it is cooled. Normally, the condensate will flow to the water collecting tray along the evaporator, and then it will be discharged out of the room through the condensate pipe connected to the water collecting tray. If the air conditioner is short of fluorine, the condensate will be intermittent or even not drained at all. Because the refrigeration area of the evaporator is reduced, the condensate will be less naturally.
Current and refrigerant pressure
Measuring the working current and refrigerant pressure of the air conditioner is the most direct way to judge whether the air conditioner is lack of fluorine. Only professional measuring instruments (ammeter and pressure gauge) are needed. If the air conditioner is short of fluorine, its working current will be less than the rated current, and the pressure measured at the fluorine filling port will be less than 0.45MPa.
Air conditioning "lack of fluorine" and "lack of refrigerant" are the most common problems of air conditioning, but the performance of air conditioning lack of fluorine is not unique, so we should not conclude that air conditioning lack of fluorine from a single performance.
