Multi-online line diameter tips and failure cases

case one, compressor failure1, frequent burning of the compressor:a project, frequent burning of the compressorThe inspection found that the air balance tube between the liquid pipe and the module of the outdoor machine, the poor quality of the elbow, deformation and bending phenomenon is obviousSolution: replace the compressor, replenish the frozen oil, ration refrigerant, pipe abnormal part replacement2, lack of oil and lubrication deficiency:failure is reflected in the compressor built-in protection, exhaust or top temperature protection, overcurrent protection, power supply empty tripping, compressor operation sound abnormal, compressor cavity temperature through highMay cause the cause:compressor long-term frequent start and stop, static oil and refrigerant deposited in the pressure machine cavity, suddenly start when the oil is discharged from the compressor with the refrigerant; So repeatedly, the compressor eventually burned down due to a lack of oilsystem contains air or moisture, compressor for a long time high temperature and high pressure operation, lubricants began to acidify and heat eventually become a gel-like substance, resulting in the compressor stuck to deathsystem return or refrigerant migration may dilute the lubricant, is not conducive to the formation of oil film, resulting in insufficient lubricationSuch as multi-connected indoor machine does not have a unified power supply, sudden power loss of the indoor machine EXV valve still maintaina a certain degree of opening, resulting in a large number of system return fluidcompressor reversal (e.gmisalignment), the internal pressure differential of the press cannot be established, resulting in the lubricant not being delivered to the friction surfacessystem refrigerant leakage can also cause oil leakage, resulting in less compressor lubricantThe existence of other chemical substances in the system, chemical reaction with the lubricant makes the deterioration of lubricants and refrigerantand lubricants together with high temperature and high pressure environment, chemical reactions occur in the high temperature and high pressure environment, so that the lubricant began to acidify and heat eventually become a gel-like substance3, compressor high temperature burn: fault performance: exhaust or top temperature protection, press cavity temperature is too high, high pressure protection (when the system is blocked), current protection or empty tripping May cause: refrigerant add too little or refrigerant leakage, resulting in high discharge temperature, dirty or ice block (ice blockmain finger return pipe), resulting in the exhaust or top temperature is too high, 4, compressor high temperature burned May cause the cause: system vacuum is not enough, compressor compressed air, pressure ratio is too large, temperature is too high, system operating environment is bad, the wind is blocked, the return wind is bad, the heat exchanger dirty, etc., resulting in high condensation pressure, exhaust temperature continue s to rise; case II, wiring problem 1, a project: the wrong cable diameter selection 1 set of 16 horses, 3 sets of 12 horses, 16 plus 12P shared diameter 6 square power cord The line diameter should be increased Note that you can't go straight and on 　　The selection of power cord: the selection of power wire is mainly the choice of wire diameter, and the wire cross-section and the load flow of the wire, but also with the wire material, model, laying method and environmental temperature, etc , affecting more factors The following is a rough estimate of the line diameter tips: "10 under five, 100 on two, 25, 35 four boundaries, 70, 95 two and a half, through the tube, temperature, eight y9 fold, bare line plus half, copper wire upgrade calculation "
Note: 10 under five means that the safety load of lines below 10 squares is five times the diameter of the line diameter, such as a 6 square millimeter line, Its safe load flow is 30A; 100 on two refers to 100 square meters of line safety load flow is twice the diameter, such as 150 square meters of insulated line safe load flow of 300A; 25, 35 four boundaries refers to 10 square to 25 square feet of insulated line load flow is four times the line diameter, 35 square to 70 square lines (excluding 70) three times 70, 95 and half times the safety load of 70 square and 95 square insulated lines is two and a half times the diameter of the line diameter "wearing tube, temperature, 80% discount" refers to if it is through pipe laying (including slot plate, that is, the line with protective cover layer), unknown dew, according to the above method calculation and then fold (by 0.8) If the bad temperature exceeds 25 degrees, according to the above line diameter method calculation and then fold For the pipe temperature two conditions at the same time, the safe load flow for the above line diameter calculation results by 70% 2, Shunde a project: the machine after a period of operation after the shutdown, the internal machine shows communication failure Cause 16 outdoor machines use 32 amps of air switch Solution Replaces the air switch the selection of the air switch: the choice of the air switch, mainly according to the high current of the air-conditioning unit to choose in the selection of air switch capacity, to be multiplied by 1.5 to 2.0 of the amplification factor That is, the capacity of the air switch should be the unit's large current multiplied by the magnification factor 3, a project: 36 multi-on-line indoor machine controlled by the controller, debugging found that the central control failed to find an internal machine A system tow 24 indoor machine, debugging all internal communication failure, after processing the outdoor machine only found 21 internal machine Check found that the network communication line wiring error, at the same time PQE signal line back, the address code dial repeated The solution should be rearranged