When air conditioners lack fluoride, five common leak detection methods will teach you who don’t understand!

When air conditioners lack fluoride, five common leak detection methods will teach you who don’t understand!

When the air conditioner is lack of fluoride, the detection of leaks is the primary task of leakage repair. Today we introduce five common leak detection methods for you, namely fluorescent leak detection, soapy water leak detection, halogen lamp leak detection, electronic leak detection, etc. .

1. Fluorescence leak detection, that is, the principle that the fluorescent leak detection agent emits bright yellow and green light when exposed to ultraviolet/blue leak detection, etc., to detect fluid leakage in various systems, but R134a is the PAG lubricant used in the initial application The compatibility with R134a is poor, and the fluorescent leak detection agent has lost its usefulness because it is difficult to find oil stains at the leak.

2. Soap water leak detection, that is, fill the system with nitrogen at a pressure level of 0.98-1.96Mpa, and then apply soapy water to all parts of the system. The bubbling point is the leakage point. This method is the most recent roadside repair shop. The leak detection method is often used, but the human arm is limited, and the vision range is also limited. In many cases, the leak is not visible at all. Tired of choosing maintenance

3. Halogen lamp leak detection, that is, after the leak detection lamp is ignited, hold the air tube on the halogen lamp close to the refrigeration system pipeline. When the pipeline leaks, the flame color will change to purple blue. Use this method to detect leaks The occurrence of open flame is not only dangerous, but the combination of open flame and refrigerant will produce harmful gas, and it is also difficult to accurately locate the leakage point.

　　4. Electronic leak detection, that is, the probe of the leak detection device is moved to the part that may leak. If the leak detection device sounds an alarm, it indicates that there is a leak. Electronic leak detection instruments are easy to damage, are more complicated to maintain and are easily affected by environmental chemicals such as gasoline and exhaust gas, and cannot accurately locate leaks.

5. Segmented pressure-holding testing, that is, making special joint fixtures, and then performing pressure-holding testing for each device and pipeline. This is a relatively reliable leak detection method. In the case of multiple devices and multiple pipelines, according to the components The cause of leakage and the condition of the vehicle, the inspection is carried out in an orderly manner according to the principle of focusing first and general, and the efficiency of maintenance work is greatly improved.

　　 Touch by hand: Touch the condensing louver fan behind the air conditioner with your hand. If the temperature is not cold or hot, and the compressor is still working, it means that fluorine has run out.

Seeing: In the cooling state, adjust the temperature controller so that the set temperature is 6°C to 8°C lower than the room temperature. After 15 minutes of operation, look at the indoor unit hydraulic pipe (that is, the thin copper pipe). There should be no frosting. , Otherwise, the machine has fluorine leakage failure. Whether there are oil traces on the copper pipe connector, if there are oil traces, it also indicates fluorine leakage.

　　Early listening: If you find that the compressor has been working since it is turned on, there is no vibration when the compressor is shut down, and the self-vibration sound of the compressor is louder than when it was purchased. It may be an abnormal sound caused by fluorine leakage.

Temperature measurement: Find a thermometer, near the cold air outlet, and see if the temperature indication is 6°C to 8°C lower than the room temperature, if it is lower than this temperature or less than 5°C or even close to the room temperature, and the compressor is still working, it proves that the fluorine is already Run away.

The air conditioner fails to clean the filter in time after a long period of time, and the internal air circulation is blocked, which will affect the heating effect of the air conditioner to a certain extent.

　　 The evaporator and condenser dust is too thick, which will also reduce the heat exchange effect, resulting in a decrease in heating capacity and an increase in power consumption; the heating temperature is set too low.

　　 If the door cracks and wall holes of the air-conditioning room are not blocked, or the windows and doors are opened frequently, causing the loss of indoor heat, it will be the unintentional reason that the air-conditioning heating is not strong.

Heating and cooling air conditioners are divided into heat pump type, heat pump auxiliary electric heating type and electric heating type. Under the condition of equal heating capacity, the power consumption of the first two is about half less than that of the third. Taking into account the power supply capacity and electricity cost, the current family The first two types of air conditioners are generally selected (but pay attention to their use conditions, the first two are only suitable for environments above -5°C, obviously not applicable to northern areas).

　　 Heat pump type air conditioner, when heating, the ambient temperature is too low, the energy efficiency ratio of the air conditioner is also reduced, and the heating effect is not ideal in the cold winter, which is normal. For heat pump type air conditioners without automatic defrosting, the lowest ambient temperature it uses is 5°C above zero. Below this temperature, no heating is possible or the effect is poor. This is because the frost on the external heat exchanger blocks the air. Flow, can no longer suck in heat from the outside; for the heat pump type air conditioner with automatic defrost, the lowest ambient temperature it uses is also -5°C, and it can't heat effectively even below this temperature.

　　The heat pump type air conditioner uses a four-way valve to switch between cooling and heating states. If the four-way valve is in series, part of the refrigerant that should have participated in the heat exchange is returned directly from the compressor outlet pipe to the return pipe at the four-way valve, resulting in less refrigerant participating in the heat exchange and reduced heat exchange efficiency. Insufficient heating capacity.

　　 When the one-way valve leaks, the pressure difference between the high and low pressures of the refrigeration system drops, the temperature of the outdoor heat exchanger rises, and the heat obtained from the outside is reduced, resulting in insufficient heating capacity. When there is a failure of normal air-conditioning refrigeration and insufficient heating capacity, by detecting the operating pressure of the system, it will be found that the pressure on the low pressure side rises, and the pressure difference between the high and low pressure drops.

The evaporator of the heat pump type air conditioner is located in the outdoor unit when it is heating. For heat pump type air conditioners that use thermal defrosting and defrosting devices, if the defrosting controller fails and the air conditioner cannot be transferred to the defrosting state in time, it will appear The frosting of the evaporator during the heat pump heating affects the heat exchange efficiency of the air conditioner heating, resulting in insufficient heating capacity and even shutdown.

　　 At this time, the following phenomena should be emphatically observed: misplacement of defrosting temperature sensing devices, sticky edges or poor contact of contacts, slippage of fan impeller or blockage of air duct, failure of solenoid valve or start relay.

　　 Now heat pump-assisted electric heating air conditioners generally use PTC electric auxiliary heating technology. PTC electric auxiliary heating technology can quickly heat under ultra-low temperature conditions. It is powerful, safe and reliable, and can be used for a long time. If the electric auxiliary heating control circuit or electric auxiliary heating equipment fails and cannot work normally, when the ambient temperature is relatively low, the air conditioner will not be able to heat enough, or even if the environment is bad, the air conditioner will not heat at all.

For heat pump-assisted electric-heated air conditioners, if the ambient temperature is high (above 5°C) and heating is normal, but the ambient temperature is low (below 0°C) and the heating capacity is insufficient or not heating, the electric auxiliary heating control circuit should be suspected Or the electric auxiliary heating equipment fails, the two parts should be checked during maintenance.

　　 When the ambient temperature is about 35 degrees Celsius, 1, low pressure 0.45MP2, high pressure above 2.5MP3, static pressure 1.1-1.2MP (R22 system). This is a normal situation and usually occurs in old air conditioners that have been in use for three to four years. The air conditioner is not completely uncooled, but the cooling effect is reduced. This is because old-fashioned air conditioners use Freon as a refrigerant, which will evaporate after long-term use. Therefore, users only need to add a little to the regular air conditioning repair point. In addition, it does not rule out the problems of Freon leakage and the machine itself caused by improper installation. 　　 The normal starting voltage of the air conditioner is 220V+-10%. In our country, the phase voltage is 220V, almost all compressors above line V can be started. When it is above 180V, 70-80% can be started, when it is above 160V, only a few can start. I have done the experiment myself. It is almost impossible to start below 160V. According to experience, the compressor starting voltage is more reliable when it is above 190V. 　　 The general selection principle is: 150-250W/m2 for cooling and 250-350W/m2 for heating. In addition, factors such as space height, level orientation, sealing performance and residential population must be considered. 　　 There is a more common saying: When the outdoor unit is in an environment above 43, most air conditioners are difficult to transfer indoor heat to the outdoors, resulting in no cooling. 　　 If you want the air conditioner to function normally without affecting human health, and to extend the life as much as possible, obviously, it is impossible to ignore it once you buy it and install it. Because the outdoor unit is exposed to the outdoors, it is easy to absorb dust and debris. If it is not cleaned for a long time, it will affect the heat dissipation performance of the machine and reduce the cooling effect of the air conditioner. The indoor unit is related to human health. If it is not cleaned for a long time, it will breed bacteria, pollute the air, and make people sick. 　　 The maximum allowable length of the connecting pipe of the air conditioner cannot exceed 8 meters for one horse, 10 meters for 1.5-2 horses, and 15 meters for more than 2 horses. The height difference between indoor and outdoor units should not exceed 5 meters. 　　The reason why the air conditioner compressor does not start: Generally, it is caused by the long-term running under the condition of insufficient Freon. Due to improper installation, internal leakage in the system is the root cause of insufficient refrigerant. 　　 The second reason why the air-conditioning compressor does not start: The air in the system is not cleaned during installation, sometimes there is ice blockage, and the compressor load increases. The increased load of the compressor causes the temperature of the compressor to increase. The refrigerating oil will deteriorate at high temperatures for a long time. The maintenance of household appliances cannot provide lubrication and cooling, which promotes the temperature of the compressor to further increase, and the coil insulation is reduced due to high temperature, causing damage to the compressor. 　　 The third reason why the air conditioner compressor does not start: the power supply is not connected well or is out of power, the power wire socket is not well connected, or the power wire diameter is thin or aging, and the power supply voltage is low. Start-up voltage of fixed frequency air conditioner: 187V, voltage fluctuation range: 198-242V, start-up power of variable frequency air conditioner 156V, voltage fluctuation range: 176-264V, it is recommended to install a voltage stabilizer in the home and it is because the connecting pipe is bent and the compressor is installed. Work load increased. 　　 Reason four that the air conditioner compressor does not start: Function lock protection. Some brands or models have a child lock function. If you are in lock mode and cannot perform any operation, you can refer to the manual to release. The compressor has been working under high temperature for a long time, resulting in reduced insulation, low coil resistance, and increased starting current. The temperature rises instantly. 　　 Solution: check and repair, the differential pressure relay is disconnected, the high-voltage circuit breaker is disconnected, press the reset button of the differential pressure relay and wait for the pressure change to close the contact or readjust the disconnect pressure.