Recently is the peak of the use of air conditioning, but also the frequent season of air conditioning failures, and the central air conditioning is not cooling or poor refrigeration maintenance is the most frequent, air conditioning is not cooling or poor refrigeration effect of the most direct reason is the refrigerant, freon, of course, may also be the air conditioning filter is too dirty or other reasons. Today, we are going to talk about how to determine whether the air conditioner lacks fluorine. When the air conditioning fluorine deficiency, the detection of leakage point is the primary work of leakage maintenance, the following is to introduce five commonly used leak detection means, respectively, fluorescent leak detection, soapy water leak detection, halogen lamp leak detection, electronic leak detection.
Fluorescent leak detection, that is, the use of fluorescent leak detection agent in ultraviolet/blue light leak detection and other irradiation will emit bright yellow-green light principle, to detect fluid leakage in various systems, but the compatibility of PAG lubricating oil used in the early application of R134a and R134a is poor, because the leak is difficult to find oil traces, fluorescent leak detection agent has also lost its use.
Soapy water leak detection, that is, into the system pressure level 0.98-1.96Mpa nitrogen, and then in the system parts coated with soapy water, bubbled is the leak point, this method is the most commonly used roadside repair leak detection method, but the human arm is limited, the scope of vision is also limited, many times can not see the leak point.
Halogen lamp leak detection, after the leak detection lamp is lit, the air on the handheld halogen lamp is close to the refrigeration system road, when the road is leaking, the flame color will turn purple blue, using this method to detect the leak has an open flame, not only dangerous, but also the combination of open flame and refrigerant will produce harmful gases, in addition, it is not easy to accurately locate the leak point.
Electronic leak detection, that is, the probe of the leak detection device is moved to the part of the possible leakage, if the leak detection device sounds an alarm, it indicates that there is a leak. Electronic leak detector is easy to damage, maintenance is more complex and easy to be affected by environmental chemicals such as gasoline, exhaust gas, and can not accurately locate the leak point.
Sectional pressure holding detection, that is, the production of special joint fixture, and then the device, the path of pressure holding detection, this is a more reliable leak detection method, in the case of multiple devices, multiple channels, according to the causes of leakage of components and combined with vehicle conditions, in accordance with the first focus after the general principle of orderly detection, the efficiency of maintenance work is greatly improved.
Air conditioning maintenance fluorine leakage self-check four steps first "hand touch" with the hand to touch the cooling shutter fan behind the air conditioner, if the feel temperature is not cool or no heat, and the compressor is still working, it indicates that it has run fluorine.
"See" in the cooling state, adjust the temperature controller, so that the temperature set is 6 ° C to 8 ° C lower than room temperature, after running for 15 minutes, look at the indoor unit hydraulic (that is, the fine copper), there should be no frost phenomenon, otherwise, the machine has fluorine leakage fault. Whether the copper connector has oil traces, if there is oil traces, it also indicates that there is fluorine leakage.
"Ear listening" if it is found that the compressor has been working since it is started, there is no shutdown vibration, and the sound of the compressor self-vibration is larger than that of the new purchase, which may be caused by abnormal sound caused by fluorine leakage.
"Temperature measurement" find a thermometer, close to the cold air outlet, see whether the temperature indicator is 6 ° C to 8 ° C lower than room temperature, such as below this temperature or less than 5 ° C or even almost the same as room temperature, and the compressor is still working to prove that fluorine has run clean.