Analysis and Prevention of Fluoride in Air Conditioner

The analysis and prevention of the lack of fluoride in air conditioner company Beijing Hongda air-conditioning refrigeration installation shift maintenance fluoridation service company's main Beijing air conditioning installation, Beijing air conditioning drilling, Beijing air conditioning transfer machine, Beijing air conditioning maintenance, Beijing air conditioning disassembly, Beijing air conditioning plus Fluorine, Beijing Air Conditioning Cleaning, Beijing Air Conditioning Recycling, Beijing Professional Drilling, Beijing Hood Punching, Beijing Water Heater Drilling, Beijing Floor Drilling, Beijing Engineering Punch Contact Mr. Qiao Business Phone 010-68682501, 68602335 Business Phone 13693022780 Fluoride deficiency is caused by leakage and is a common failure of air conditioners. The “deficiency of fluorine” judgment method, preventive measures, and maintenance operations are a major professional skill for maintenance personnel and a common concern for air conditioner users. Split-type air conditioners generally have varying degrees of leakage. The connection method of each part of the refrigeration system has both welding and threaded connection, and the thread connection is the fundamental reason for the “deficiency of fluorine” of the air conditioner, and “deficiency of fluorine” is unavoidable. However, how to find problems and solve problems and reduce the “deficiency of fluoride” to a low level is an important issue facing air-conditioning maintenance personnel. First, the sign of the normal operation of the refrigeration system is to turn the remote control to a low temperature. After the compressor is continuously operated for 30 minutes, the air conditioner should have the following features. 1. Outdoor tracheal valves (thick tube valves) should be wet or dew, and there is a clear feeling of coolness with the hand. 2. Outdoor liquid valve (thin tube valve) should be dry or wet. 3. The outdoor drainage hose should drip smoothly, and as the relative humidity of the room increases, the dew point temperature rises and the displacement increases. 4. The temperature difference between the inlet and outlet of the indoor unit is above 8°C. 5, using a clamp ammeter to measure the working current, should be close to the rated current in the nameplate. 6, from the trachea valve fluorine-filled mouth (commonly known as self-blocking, similar to the tire tire valve measurement pressure should be 0.45-0.5MPa. Second, the air-conditioning "deficiency of fluorine" after the phenomenon of continuous operation of the compressor 30 minutes, if "The lack of fluorine" in the refrigeration system causes the following phenomena: l The tracheal valve is dry, and there is no obvious cooling effect when it is touched by hand. The reason is that the shortage of refrigerant causes the boiling point in the evaporator to advance, which makes the valve cool. The superheat of the agent increases and the temperature of the valve rises, which is greater than the dew point temperature of the outdoor air.2.The frost of the liquid pipe valve.The reason is that “deficiency of fluorine” causes the pressure in the liquid pipe to drop, the boiling point decreases, and the valve temperature is lower than the freezing point. , Open the indoor unit panel, remove the filter, you can find only part of the evaporator condensation or frost. The reason is due to lack of refrigerant, only part of the evaporator boiling heat absorption, so that the corresponding reduction in cooling area. There is no thermal sensation in the exhaust air of the outdoor unit, which is caused by the shortage of refrigerant, which leads to the decrease of condensing pressure and condensing temperature, and the reduction of the platoon temperature.5.The drainage hose drains intermittently or not at all. The evaporator cooling area is reduced, the dew condensation area is reduced, and the condensed water volume is reduced.6, The outdoor air and liquid valves are oily and there is oil leakage.The reason is that the refrigerant and the refrigeration oil have a certain mutual solubility, fluorine from The leaking point escapes into the atmosphere, and the oil adheres around the leaking point.7 The operating current of the measuring air conditioner is less than the rated current, which is caused by the shortage of the refrigerant, so that the working load of the compressor is reduced and the current is decreased. The pressure measured at the fluorine inlet of the machine is lower than 0.45Mpa, which is caused by the shortage of refrigerant and the decrease of the evaporation pressure.In addition, frosting of any valve in the outdoor unit is not normal; only the frosting of the liquid valve indicates “deficiency of fluorine”. Serious; only the tracheal valve frosting instructions slightly "failure" or the ambient temperature is too low; both valves are frosting indicates that the system has a secondary throttling phenomenon. Third, the "deficiency of fluoride" causes and precautions 1. Connect the interior, The purple brass bell mouth of the outer purple tube is poorly sealed, mainly due to improper installation and maintenance, and the following matters should be noted in the installation and maintenance operations: (1) To ensure the cleanness of the bell mouth (2) Applying frozen oil to avoid scratches; (3) Annealing should be done before the old pipe is flared; (4) Scrape the edges of the pipe mouth before expanding the flare; (5) The area of ​​the flare should be reasonable. Small and unsealed, the nut cannot be screwed tightly and the bell mouth is deformed 2. The leakage of the valve core of the fluorine-filled mouth is mainly due to the aging of the plunger around the thimble, or the aging of the conical rubber seal ring. Outgoing fluorine is flushed out of the impurities; if there is still a bubble after the leak detection by the detergent, it means that the impurities are not washed out or the sealing ring is aged and deformed, and the valve body should be cleaned or replaced after the fluorine is switched on. Apply frozen oil to improve its sealing performance 3. If the gas, liquid valve and the sealed copper cap of the fluorine-filled mouth are not tightened or have impurities, leakage may also be caused, and the sealed copper cap may be dirty with carbon tetrachloride or Kerosene cleaning; can apply frozen oil before tightening, to avoid scratching the sealing cone, to ensure its sealing performance; the strength of sealing copper cap screwing should be moderate, too large and easy to cause tripping, too small and not sealed. Fourth, the "supplement fluoride" operation 1. Use a fluorine-filled hose to connect the refrigerant cylinders, repair the meter, and fill the fluorine outlet, and remove the air in the hose. 2. Start the compressor and use the pressure difference between the cylinder and the refrigeration system to charge the refrigerant gas. (If the refrigeration system is pre-vacuum, it should be filled with refrigerant gas under stop state, and then wait until the pressure gauge pointer no longer rises. The machine is charged with fluorine. 3. Observe the pressure gauge pointer change during the fluorine filling process. The pressure gauge pointer is maintained in the range of 0.45-0.5 Mpa by intermittent nitrogen filling. 4. After the test run for 30 minutes, the air conditioner should have the above normal operation. 5. Use the detergent to check each leak suspect after shutting down. If a bubble is generated, the relevant nut can be properly tightened; bubbles still occur, and the refrigeration system should be subjected to fluorine collection. Refer to the above operating procedures for “drainage” treatment.