Common Faults and Maintenance of Air Conditioning Capillary and Dry Fi

Original Title: Common Faults and Maintenance of Air Conditioning Capillary and Dry Filter 1 The common faults of capillary tubes in the refrigeration system of air conditioners are basically the same as those in the refrigeration system of refrigerators, which are "dirty blockage" or "ice blockage". The fault phenomenon that the capillary tube in the refrigeration system of the air conditioner is "dirty and blocked" is that after the compressor has been running for a period of time, there is still no cold air blowing out of the evaporator or the temperature of the air blowing out is higher. At this time, no hot air is blown out from the condenser side. 2 The phenomenon of "dirty capillary" is easy to be mixed with the fault phenomena such as fluorine loss and leakage of the refrigeration system of the air conditioner, and the surface of the outdoor condenser is too dirty to carry out heat exchange well, which is not easy to judge. In order to accurately judge whether the capillary tube is'dirty and blocked ', hang a pressure gauge on the liquid outlet valve and air return valve of the outdoor unit of the split air conditioner, start the compressor to operate, and observe the change of the pressure gauge. If it is found that the pressure of the high pressure gauge is high during operation,wiped film distillation, while the pressure of the low pressure gauge is close to zero, it indicates that the refrigeration system does not lack fluorine, but is "dirty and blocked". In order to determine whether the capillary tube is "dirty and blocked" or the dry filter is "dirty and blocked",jacketed glass reactor, a small opening can be cut between the capillary tube and the dry filter with scissors to see whether there is refrigerant spraying out. If there is refrigerant spraying out, it indicates that the capillary tube is dirty and blocked. If there is no refrigerant spraying out, it indicates that the dry filter is dirty and blocked. 3 After the capillary is dirty and blocked, it is better to replace the capillary with the same inner diameter and length. If you don't have a suitable capillary at hand, you can use the heating method, that is, use the outer flame of gas welding to heat the capillary and burn the dirt inside. At the same time of heating, nutsche filter dryer ,jacketed glass reactor, nitrogen can be used to pressurize and blow from the outlet end of the capillary tube (that is, the end connected with the evaporator of the air conditioner) to blow out the viscera accumulated in the capillary tube. 4 The capillary tube in the refrigeration system of the air conditioner will also have the fault of "ice blockage", especially in the heat pump type air conditioner. The cause of "ice blockage" in the refrigeration system of air conditioner is similar to that of "ice blockage" in the refrigeration system of refrigerator, which is generally caused by non-standard operation in the assembly of refrigeration system. 5 The fault phenomenon of "ice blockage" in the refrigeration system of the air conditioner is also similar to the fault of "ice blockage" in the refrigeration system of the refrigerator, that is, the air conditioner refrigeration system works normally for a while and does not work normally for a while, and so on. 6 The method to solve the problem of "ice blockage" in the refrigeration system of air conditioner is to discharge the refrigerant in the refrigeration system, replace the dry filter, and then vacuumize the refrigeration system for a long time in order to completely remove the residual moisture in the system. Be sure to fill the refrigerant according to the requirements of the specification 7 If the air conditioner uses more than two capillary tubes, great attention should be paid to the diameter, length and position of each capillary tube, because the inner diameter and length of the capillary tube are determined according to different evaporation areas and shunt needs in the design, which will affect the performance and function of the air conditioner. Attention should be paid to this point during maintenance. 8 Judgment and Maintenance Methods of Common Faults of Dry Filter The most common fault of dry filter in the refrigeration system of air conditioner is "dirty and blocked". The main reasons for the "dirty blocking" fault are that the operation of the refrigeration system is not standardized during welding, and the heating time is too long, so that a large number of oxide layers on the inner wall of the pipeline fall off; the mechanical wear caused by the long-term operation of the compressor produces metal debris 。 The refrigeration system is not cleaned before the refrigerant is added. 9 The fault phenomenon of "dirty blockage" in the drying filter of air conditioner refrigeration system is similar to that of "dirty blockage" in the capillary tube, and the judgment method is the same. That is to say, after disconnecting the interface between the capillary tube and the dry filter, a large amount of refrigerant can not be seen. Then disconnect the condenser from the drying filter. : If a large amount of refrigerant is ejected, it can be judged that the drying filter is "dirty and blocked". 10 Troubleshooting of "dirty and blocked" drying filter: remove the "dirty and blocked" drying filter, and blow the refrigeration system with high-pressure nitrogen (gauge pressure of 0.4MPa), focusing on the high-pressure side. Then replace with a new dry filter.
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