Second, the preparation before the overhaul<\/p>\n\n\n\n

\n
1. Understand\u00a0the\u00a0occurrence\u00a0time\u00a0and\u00a0condition\u00a0of\u00a0air\u00a0conditioner\u00a0failure,\u00a0and\u00a0whether\u00a0there\u00a0are\u00a0external factors.<\/li>\n<\/ol>\n\n\n\n

   2.\u00a0the\u00a0air\u00a0conditioner\u00a0should\u00a0be\u00a0checked\u00a0in\u00a0operation\u00a0(except\u00a0for\u00a0not\u00a0running),\u00a0so\u00a0that\u00a0it\u00a0is\u00a0fully\u00a0exposed\u00a0to symptoms.<\/p>\n\n\n\n

   3.\u00a0do\u00a0not\u00a0be\u00a0too\u00a0hasty\u00a0underground\u00a0conclusion,\u00a0proceed\u00a0to\u00a0repair,\u00a0but\u00a0to\u00a0check\u00a0carefully,\u00a0after\u00a0thinking repeatedly and then repair.<\/p>\n\n\n\n

   <\/figure>\n\n\n\n

   Third, the failure analysis of refrigeration system<\/p>\n\n\n\n

   (a) refrigeration system pressure and temperature measurement: in addition to the deterioration of indoor and outdoor ambient temperature, operating pressure and temperature beyond the normal range, there must be a fault, which is a very important basis for judging the cause of the fault.<\/p>\n\n\n\n

   1.\u00a0the\u00a0pressure\u00a0of\u00a0the\u00a0refrigeration\u00a0system:\u00a0refers\u00a0to\u00a0its\u00a0suction\u00a0pressure\u00a0and\u00a0exhaust\u00a0pressure;<\/p>\n\n\n\n

   (1) The suction pressure is the pressure of the compressor suction port, but the measurement means are difficult; Because the pressure difference between the suction tube and the suction mouth is small, the pressure at any place on the suction tube can be used as the suction pressure, and the suction pressure is close to the evaporation pressure.<\/p>\n\n\n\n

   (2) exhaust pressure refers to the pressure of the compressor exhaust port, for the completely closed compressor, before the capillary, the pressure at any place on the gas pipe can be used as the exhaust pressure.<\/p>\n\n\n\n

   2. the temperature content of the refrigeration system: evaporation temperature, suction temperature, condensing temperature, exhaust temperature, infusion temperature, etc., and the system plays a decisive\u00a0role\u00a0in\u00a0the\u00a0evaporation\u00a0temperature\u00a0and\u00a0condensation\u00a0temperature.\u00a0The\u00a0above\u00a0temperature\u00a0can be\u00a0found\u00a0only by measuring\u00a0the\u00a0pressure\u00a0and\u00a0checking\u00a0the\u00a0thermodynamic\u00a0property table\u00a0of\u00a0the\u00a0working medium.<\/p>\n\n\n\n

   2.\u00a0the\u00a0influence\u00a0of\u00a0inspiratory\u00a0pressure\u00a0change\u00a0on\u00a0the\u00a0system<\/p>\n\n\n\n

   When refrigeration is running, the suction pressure is closely related to the evaporation temperature and the circulation amount of refrigerant; For the system with capillary as throttling, the suction pressure is related to the condensing pressure, refrigeration dose, compressor efficiency, and refrigeration load, so when checking the refrigeration system, the pressure gauge should be installed in the suction pipe section, and the suction pressure can be read to provide an important basis for fault analysis.<\/p>\n\n\n\n

   (1) The inspiratory pressure is lower than the normal value, and the reasons are: the refrigeration dose is small, the cold load is small, the condensing pressure is low and the filter is not smooth.<\/p>\n\n\n\n

   (2) The suction pressure is higher than the normal value, the reasons are: excessive refrigerant charging, large refrigeration load, high condensing pressure and poor compressor efficiency;<\/p>\n\n\n\n

   3. when the refrigeration system is running, the exhaust pressure corresponds to the condensing temperature,\u00a0and\u00a0the\u00a0condensing\u00a0temperature\u00a0is\u00a0related\u00a0to\u00a0the\u00a0flow\u00a0rate\u00a0and\u00a0temperature\u00a0of\u00a0the\u00a0cooling medium, the injection amount of refrigerant, the efficiency of the compressor and the cold load. When checking the refrigeration system, a pressure gauge can be installed on the exhaust pipe to read the exhaust pressure as an analysis of fault data.<\/p>\n\n\n\n

   (1) The exhaust pressure is higher than the normal value, the reasons are: low flow of cooling medium or high temperature of cooling medium, excessive refrigerant charge, large cooling load, etc.; The amount of refrigerant charging is large, and the excess refrigeration liquid occupies part of the condensing pipe, which reduces the condensing area and causes the condensation temperature to rise.<\/p>\n\n\n\n

   (2) The exhaust pressure is lower than the normal value, the reasons are: the compressor efficiency is poor, the refrigeration dose is less, the cooling load is small, the filter is not smooth and the cooling medium temperature is low; These factors will cause the circulation of the system to decrease, the condensation load is small, so that the condensation temperature drops.<\/p>\n\n\n\n

   4. From the above inspiratory pressure and exhaust pressure changes, the two are closely related. In general,\u00a0the\u00a0suction\u00a0pressure\u00a0is\u00a0high,\u00a0the\u00a0exhaust\u00a0pressure\u00a0is\u00a0high;\u00a0Low\u00a0suction\u00a0pressure,\u00a0low\u00a0exhaust pressure; This is the operation law of the refrigeration system.<\/p>\n\n\n\n

   (2) The impact of temperature changes on the refrigeration system:<\/p>\n\n\n\n

   1.\u00a0the\u00a0evaporation\u00a0temperature\u00a0and\u00a0its\u00a0suction\u00a0pressure\u00a0is\u00a0corresponding\u00a0to\u00a0the\u00a0condensation\u00a0temperature is corresponding to the exhaust pressure, the analysis of the suction pressure and exhaust pressure changes,\u00a0is\u00a0equal\u00a0to\u00a0the\u00a0analysis\u00a0of\u00a0the\u00a0evaporation\u00a0temperature\u00a0and\u00a0condensation\u00a0temperature\u00a0changes.<\/p>\n\n\n\n

   \n
   • The\u00a0suction\u00a0temperature\u00a0is\u00a0closely\u00a0related\u00a0to\u00a0the\u00a0exhaust\u00a0temperature,\u00a0that\u00a0is,\u00a0the\u00a0suction\u00a0temperature is high, and the exhaust temperature is correspondingly increased, and the reverse is low. The suction temperature is related to the flow rate of the system, the flow rate is larger, the suction temperature is lower, and the reverse is higher.<\/li>\n\n\n\n
   • For\u00a0th\u00a0capillary\u00a0system,\u00a0the\u00a0inspiratory\u00a0temperature\u00a0is\u00a0related\u00a0to\u00a0the\u00a0amount\u00a0of\u00a0refrigerant\u00a0injection, the refrigeration dose is more, the inspiratory temperature is low, and the reverse is high. The exhaust temperature\u00a0is\u00a0related\u00a0to\u00a0the\u00a0condensing\u00a0temperature,\u00a0the\u00a0condensing\u00a0temperature\u00a0is\u00a0high,\u00a0the\u00a0exhaust temperature is high, and the reverse is low.<\/li>\n<\/ul>\n\n\n\n

     2.\u00a0condensing\u00a0unit\u00a0components\u00a0of\u00a0the\u00a0surface\u00a0temperature\u00a0changes\u00a0on\u00a0the\u00a0impact\u00a0of\u00a0the\u00a0system<\/p>\n\n\n\n

     These temperatures are difficult to measure with a thermometer, use the feel to estimate its temperature range, and then judge whether the temperature is normal or not.<\/p>\n\n\n\n

     \n
     • The\u00a0impact\u00a0of\u00a0the\u00a0compressor\u00a0housing\u00a0and\u00a0exhaust\u00a0temperature\u00a0changes:\u00a0in\u00a0summer,\u00a0the\u00a0compressor exhaust\u00a0temperature\u00a0should\u00a0not\u00a0exceed\u00a0130 \u00b0C,\u00a0exceeding\u00a0this temperature\u00a0is abnormal.<\/li>\n<\/ul>\n\n\n\n

       The ultra-high exhaust temperature is caused by the ultra-high suction temperature of the compressor. The\u00a0consequence\u00a0is\u00a0that\u00a0the\u00a0frozen\u00a0oil\u00a0may\u00a0form\u00a0carbon,\u00a0affecting\u00a0the\u00a0life\u00a0of\u00a0the\u00a0compressor.\u00a0 If\u00a0the exhaust temperature\u00a0is\u00a0not\u00a0hot,\u00a0it\u00a0indicates\u00a0that\u00a0the\u00a0suction\u00a0temperature\u00a0is\u00a0very\u00a0low,\u00a0and\u00a0the\u00a0compressor\u00a0runs\u00a0in case\u00a0of\u00a0little\u00a0refrigerant,\u00a0which\u00a0will\u00a0affect\u00a0the\u00a0heat\u00a0dissipation\u00a0of\u00a0the\u00a0motor\u00a0winding\u00a0and\u00a0accelerate\u00a0the\u00a0aging of the insulating material.<\/p>\n\n\n\n

       \n
       • The\u00a0influence\u00a0of\u00a0the\u00a0temperature\u00a0change\u00a0of\u00a0the\u00a0condenser\u00a0heat\u00a0pipe:\u00a0under\u00a0normal\u00a0circumstances,\u00a0the front\u00a0half\u00a0of\u00a0the\u00a0exhaust\u00a0pipe\u00a0is\u00a0very\u00a0hot,\u00a0and\u00a0the\u00a0heat\u00a0sensitivity\u00a0of\u00a0the\u00a0back\u00a0half\u00a0of\u00a0the\u00a0heat\u00a0pipe\u00a0is\u00a0greatly<\/li>\n<\/ul>\n\n\n\n

         reduced than that of the front half, which is because the refrigerant in the back half pipe has gradually liquefied, reaching the condensing temperature and subcooling temperature.<\/p>\n\n\n\n

         Under abnormal circumstances, one is that the first half is not too hot, and the second half is close to the ambient temperature, mainly because the compressor inhales the liquid refrigerant or the cold dose is less. The other is that the whole condensing tube is very hot, the reason is that the refrigeration dose is too much, the ventilation is small, or the ambient temperature is very high.<\/p>\n\n\n\n

         \n
         • infusion\u00a0tube\u00a0temperature:\u00a0the\u00a0liquid\u00a0tube\u00a0is\u00a0warm.<\/li>\n<\/ul>\n\n\n\n

           Abnormal condition, the liquid pipe is too hot. The reason is that the condenser heat dissipation is not good, the condensation temperature is high or the refrigerant charge is too much.<\/p>\n\n\n\n

           \n
           • Filter\u00a0temperature:\u00a0the\u00a0same\u00a0as\u00a0the\u00a0liquid\u00a0pipe;<\/li>\n<\/ul>\n\n\n\n

             Abnormal phenomenon is that the filter is cold. The reason is that part of the mesh of the filter is blocked, and when the refrigerant flows through the filter, there is throttling. There is also an abnormal situation that the filter is not hot, similar to the ambient temperature, the reason is that the filter is all blocked by sludge, and the refrigerant can not flow through.<\/p>\n\n\n\n

             \n
             • Suction\u00a0tube\u00a0temperature:\u00a0under\u00a0normal\u00a0circumstances:\u00a0suction\u00a0tube\u00a0feel\u00a0very\u00a0cool,\u00a0and\u00a0dew.<\/li>\n<\/ul>\n\n\n\n

               Abnormal situation, one is that the suction tube is too cold, too much dew, so that the pump shell large area condensation. The reason is that the refrigeration dose is large, the liquid can not be fully vaporized in the evaporator, and there is liquid reflux phenomenon. The harm is that the compressor may carry out wet stroke operation, serious liquid strike will occur, and the valve disc is threatened. The second is that the suction pipe is not cool, no condensation, and the pump shell is very hot. The reason is that the refrigerant flow is small or the refrigeration dose is insufficient, and the consequence is that the exhaust temperature rises and the cooling capacity decreases.<\/p>\n\n\n\n

               6, evaporation unit related to the impact of temperature changes on the system<\/p>\n\n\n\n

               \n
               • Capillary:\u00a0capillary\u00a0is\u00a0very\u00a0cool,\u00a0and\u00a0there\u00a0is\u00a0dew,\u00a0there\u00a0is\u00a0liquid\u00a0flow\u00a0sound.<\/li>\n<\/ul>\n\n\n\n

                 Abnormal situation: one is that the surface is very cool and dew is also condensation, but the flow sound is louder, and it is the flow of gas. The reason is that there is less refrigerant. The second is that the surface is not cool, there is no dew, and you can't hear the flowing sound. The reason is that the capillaries are blocked.<\/p>\n\n\n\n

                 \n
                 • evaporator temperature: normal conditions: the outer surface of the evaporator is very cold, its condensation\u00a0beads\u00a0continue\u00a0to\u00a0drop,\u00a0and\u00a0the\u00a0temperature\u00a0difference\u00a0between\u00a0the\u00a0inlet\u00a0and\u00a0outlet\u00a0wind\u00a0is large, usually in 12-14 \u00b0C.<\/li>\n<\/ul>\n\n\n\n

                   Abnormal conditions: the evaporator surface is not too cool, dew is not much, or no condensation, you can hear the flow sound is very loud, and the temperature difference in and out of the wind is small. The reason is that the refrigeration dose is insufficient.<\/p>\n\n\n\n

                   7.\u00a0the\u00a0impact\u00a0of\u00a0ambient\u00a0temperature<\/p>\n\n\n\n

                   \n
                   • Outdoor\u00a0temperature:\u00a0generally\u00a0exceeds\u00a035\u00a0\u00b0C,\u00a0the\u00a0system\u00a0operation\u00a0may\u00a0exceed\u00a0the\u00a0normal\u00a0situation, mainly in the condensation temperature is high, exhaust temperature is high, cooling capacity decline, followed\u00a0by\u00a0the\u00a0result\u00a0is\u00a0caused\u00a0by\u00a0overload\u00a0operation.<\/li>\n<\/ul>\n\n\n\n

                     When the temperature exceeds 43 \u00b0C, it has exceeded the critical point of safe operation of the air conditioner, which will lead to the action of the electronic protection device and cut off the power supply. If you want to force operation, the consequence is to shorten the service life of the air conditioner.<\/p>\n\n\n\n

                     \n
                     • Indoor\u00a0temperature:\u00a0the\u00a0normal\u00a0constant\u00a0temperature\u00a0does\u00a0not\u00a0exceed\u00a030\u00a0\u00b0C.<\/li>\n<\/ul>\n\n\n\n

                       If the evaporation unit runs above 30 \u00b0C for a long time, the air conditioner will run under overload for a long time, and the condensation temperature and exhaust temperature of the outdoor unit will rise. Will lead to overheating over current protector action, cut off the power supply.<\/p>\n\n\n\n

                       8. heat pump system: the operation is the same as the single cooling condition, the heat pump mainly checks the working condition of the reversing valve; The reversing air flow of the reversing valve, the electromagnetic\u00a0valve\u00a0suction\u00a0sound,\u00a0the\u00a0reversing\u00a0valve\u00a0is\u00a0faulty,\u00a0it\u00a0can\u00a0not\u00a0be\u00a0used\u00a0for\u00a0heating\u00a0operation, generally only replacement.<\/p>\n\n\n\n

                       Four, fully enclosed compressor failure analysis: because the spare parts are difficult to buy, even if the motor burns out the heavy winding coil, it is difficult to guarantee, therefore, the general replacement of the compressor.<\/p>\n\n\n\n

                       (a) When replacing the compressor should pay attention to:<\/p>\n\n\n\n

                       1.\u00a0should\u00a0be\u00a0the\u00a0same\u00a0model\u00a0of\u00a0the\u00a0same\u00a0specifications\u00a0of\u00a0the\u00a0compressor.\u00a0If\u00a0there\u00a0is\u00a0no\u00a0press\u00a0of\u00a0the\u00a0same model, its main performance specifications should also be the same or close. The main performance includes the refrigerating capacity under the same working conditions, the voltage, phase frequency, current, etc., and the capacitance of the capacitor.<\/p>\n\n\n\n

                       2.\u00a0the\u00a0overall\u00a0size\u00a0should\u00a0be\u00a0the\u00a0same\u00a0or\u00a0equivalent,\u00a0the\u00a0foot\u00a0size\u00a0should\u00a0be\u00a0the\u00a0same.\u00a0If\u00a0you\u00a0can\u00a0not\u00a0buy the same foot size of the compressor, you need to modify the foot of the air conditioner chassis.<\/p>\n\n\n\n

                       3.\u00a0the\u00a0direction\u00a0and\u00a0position\u00a0of\u00a0the\u00a0suction\u00a0and\u00a0exhaust\u00a0pipe\u00a0should\u00a0be\u00a0the\u00a0same\u00a0or\u00a0close.\u00a0If\u00a0they\u00a0are\u00a0not the same, an important new arrangement will take over.<\/p>\n\n\n\n

                       (2) Fully enclosed compressor prone to failure:<\/p>\n\n\n\n

                       1. poor refrigeration efficiency: refers to the actual displacement of the compressor decreases, can not reach\u00a0the\u00a0nominal\u00a0cooling\u00a0capacity\u00a0of\u00a0the\u00a0product\u00a0calibration,\u00a0can\u00a0not\u00a0meet\u00a0the\u00a0original\u00a0cooling\u00a0load.\u00a0Poor refrigeration efficiency is generally caused by the following two factors:<\/p>\n\n\n\n

                       \n
                       • serious wear\u00a0of piston and\u00a0cylinder: the gap between\u00a0piston and cylinder\u00a0is\u00a0quite strict,\u00a0and there\u00a0is a layer\u00a0of\u00a0oil\u00a0film\u00a0in\u00a0the\u00a0gap\u00a0to\u00a0lubricate\u00a0and\u00a0seal.\u00a0If\u00a0the\u00a0gap\u00a0between\u00a0the\u00a0piston\u00a0and\u00a0the\u00a0cylinder\u00a0is\u00a0large,\u00a0the oil film\u00a0will\u00a0be\u00a0disconnected, resulting\u00a0in gas leakage; If\u00a0the\u00a0clearance is too small,\u00a0it will produce\u00a0melting (holding)\u00a0or\u00a0starting\u00a0difficulties.\u00a0When\u00a0the\u00a0piston\u00a0or\u00a0cylinder\u00a0is\u00a0seriously\u00a0worn,\u00a0when\u00a0the\u00a0piston\u00a0compresses and exhausts, a part of the gas in the cylinder leaks into the pump housing through the gap, so that the exhaust volume is lost, and the compressor cannot reach the original exhaust volume.<\/li>\n<\/ul>\n\n\n\n
                         \n
                         • Serious\u00a0leakage\u00a0of\u00a0the\u00a0air\u00a0valve:\u00a0when\u00a0the\u00a0suction\u00a0and\u00a0exhaust\u00a0valves\u00a0on\u00a0the\u00a0valve\u00a0plate\u00a0are\u00a0not\u00a0sealed with\u00a0the\u00a0valve\u00a0line\u00a0on\u00a0the\u00a0valve\u00a0plate,\u00a0there\u00a0is\u00a0a\u00a0gap.\u00a0When\u00a0it\u00a0is suction\u00a0and\u00a0exhaust,\u00a0a\u00a0part\u00a0of\u00a0the\u00a0gas will leak\u00a0back\u00a0from\u00a0the\u00a0gap,\u00a0causing\u00a0the\u00a0loss\u00a0of\u00a0the\u00a0exhaust\u00a0volume\u00a0of\u00a0the\u00a0compressor.\u00a0The\u00a0production\u00a0factors are as follows:<\/li>\n<\/ul>\n\n\n\n

                           A, the system is not clean, there is sludge mixed in the refrigerant flow, sludge sticks to the valve line and valve plate, hit by the valve plate, accelerate the valve plate and valve line wear, its sealing gradually weakened.<\/p>\n\n\n\n

                           B.\u00a0the\u00a0exhaust\u00a0temperature\u00a0is\u00a0often\u00a0too\u00a0high,\u00a0so\u00a0that\u00a0part\u00a0of\u00a0the\u00a0frozen\u00a0oil\u00a0gradually\u00a0carbon,\u00a0stick\u00a0to\u00a0the valve structure, destroy the valve sealing.<\/p>\n\n\n\n

                           C. the system often occurs mild liquid strike, the valve plate is gradually deformed or damaged by the impact\u00a0of\u00a0the\u00a0liquid,\u00a0or\u00a0aggravate\u00a0the\u00a0wear\u00a0and\u00a0weaken\u00a0the\u00a0sealing\u00a0of\u00a0the\u00a0valve\u00a0structure.\u00a0The\u00a0valve\u00a0plate has been severely hit by liquid, the valve is damaged, and the valve plate is broken, and the sealing is seriously damaged. The symptoms of the above situation are that the exhaust pressure drops, the inspiratory\u00a0pressure\u00a0rises,\u00a0the\u00a0suction\u00a0and\u00a0exhaust\u00a0pressure\u00a0difference\u00a0is\u00a0small\u00a0or\u00a0small,\u00a0and\u00a0the\u00a0serious\u00a0is almost zero; Under normal circumstances, the difference in pressure is very large, the pump shell has different degrees of heat, and some exhaust pipes are very hot.<\/p>\n\n\n\n

                           2.\u00a0the\u00a0compressor\u00a0is not\u00a0running:\u00a0when\u00a0the\u00a0compressor\u00a0power\u00a0supply,\u00a0only\u00a0hear\u00a0the\u00a0pump\u00a0shell\u00a0machine has\u00a0a\u00a0\"buzzing\"\u00a0sound,\u00a0but\u00a0not\u00a0running,\u00a0about\u00a03-5\u00a0seconds\u00a0time,\u00a0thermal\u00a0protection\u00a0jump,\u00a0cut\u00a0off\u00a0the\u00a0power supply. This symptom is caused by the following faults: the compressor is less oil, poor lubrication, the cylinder, the motor is not moved.<\/p>\n\n\n\n

                           3.\u00a0compressor\u00a0motor\u00a0damage:\u00a0symptoms\u00a0are:\u00a0when\u00a0the\u00a0power\u00a0is\u00a0switched\u00a0on,\u00a0the\u00a0fuse\u00a0is\u00a0blown\u00a0or\u00a0the\u00a0air switch trip. This symptom has the following three kinds of failure:<\/p>\n\n\n\n

                           \n
                           • Because the motor stator winding is burned out, the insulation layer of the electromagnetic coil is scorched, the insulation is destroyed, and the winding touches the shell. The cause is that the air conditioner\u00a0is\u00a0overloaded\u00a0for\u00a0a\u00a0long\u00a0time,\u00a0and\u00a0the\u00a0protector\u00a0fails,\u00a0so\u00a0that\u00a0the\u00a0winding\u00a0works\u00a0for\u00a0a\u00a0long\u00a0time under the condition of superheat, the insulation gradually aging, and finally the insulation layer is destroyed.<\/li>\n<\/ul>\n\n\n\n
                             \n
                             • inter-turn short circuit makes part of the coil insulation in the stator winding of the motor be broken down\u00a0and\u00a0part\u00a0of\u00a0the\u00a0coil\u00a0touch\u00a0the\u00a0shell.\u00a0Cause:\u00a0stator\u00a0winding\u00a0or\u00a0assembly,\u00a0the\u00a0local\u00a0electromagnetic\u00a0coil is slightly damaged, after running for a period of time, the scar spread and breakdown insulation.<\/li>\n<\/ul>\n\n\n\n
                               \n
                               • Touch\u00a0the\u00a0wire,\u00a0the\u00a0motor\u00a0power\u00a0supply\u00a0wire\u00a0insulation\u00a0is\u00a0damaged\u00a0or\u00a0cut\u00a0off\u00a0and\u00a0touch\u00a0the\u00a0shell.\u00a0The insulation layer of the stator winding of the motor is seriously aging, but it has not been burned out. Its symptoms are a little different from the above, that is, it can run for I-2 minutes, and then also burst the fuse, or the air switch trip, and the current is very large. The reason for this is the same reason that the winding burns out, and this motor does not work.<\/li>\n<\/ul>\n\n\n\n

                                 4. Abnormal noise during operation: the internal parts of the pump shell collide with each other after relaxation, generally the exhaust pipe touches the pump shell, the bearing is worn out and causes the piston to knock the valve plate, as well as the stator and rotor friction, electromagnetic noise of the motor.<\/p>\n\n\n\n

                                 Fifth, electrical system fault analysis<\/p>\n\n\n\n

                                 \n
                                 • The\u00a0electrical\u00a0control\u00a0of\u00a0the\u00a0air\u00a0conditioner:\u00a0strong\u00a0current\u00a0line\u00a0control\u00a0board\u00a0and\u00a0electronic\u00a0line\u00a0control board;\u00a0Electrical\u00a0equipment\u00a0is\u00a0to\u00a0control\u00a0and\u00a0protect\u00a0the\u00a0refrigeration\u00a0system\u00a0and\u00a0fan\u00a0system\u00a0of\u00a0the\u00a0device,<\/li>\n<\/ul>\n\n\n\n

                                   in addition to the electrical line itself failure, there are a considerable part of the failure in the refrigeration system and fan system, but its symptoms are reflected from the electrical control.<\/p>\n\n\n\n

                                   \n
                                   • The\u00a0phenomenon\u00a0of\u00a0strong\u00a0current\u00a0control\u00a0system\u00a0failure<\/li>\n<\/ul>\n\n\n\n

                                     1.\u00a0compressor\u00a0and\u00a0fan\u00a0do\u00a0not\u00a0operate:<\/p>\n\n\n\n

                                     \n
                                     • No\u00a0power\u00a0supply;\u00a0The\u00a0power\u00a0socket\u00a0is\u00a0disconnected;\u00a0Poor\u00a0plug\u00a0socket\u00a0contact;<\/li>\n\n\n\n
                                     • the\u00a0connector\u00a0contact\u00a0is\u00a0poor,\u00a0the\u00a0fuse\u00a0of\u00a0the\u00a0control\u00a0line\u00a0is\u00a0blown,\u00a0and\u00a0the\u00a0internal\u00a0break\u00a0of\u00a0the\u00a0switch is selected;<\/li>\n\n\n\n
                                     • the\u00a0power\u00a0supply\u00a0voltage\u00a0is\u00a0too\u00a0low,\u00a0the\u00a0motor\u00a0can\u00a0not\u00a0start,\u00a0and\u00a0then\u00a0the\u00a0thermal\u00a0protector\u00a0jumps\u00a0and cuts off the power supply;<\/li>\n\n\n\n
                                     • the\u00a0electrical\u00a0control\u00a0line\u00a0is\u00a0broken.\u00a0There\u00a0are\u00a0improper\u00a0operation,\u00a0quality\u00a0problems,\u00a0refrigeration system and fan system caused.<\/li>\n<\/ul>\n\n\n\n

                                       2.\u00a0the\u00a0fan\u00a0is running\u00a0but\u00a0the\u00a0compressor\u00a0is\u00a0not running<\/p>\n\n\n\n

                                       \n
                                       • The\u00a0overload\u00a0protector\u00a0contact\u00a0is\u00a0in\u00a0the\u00a0disconnected\u00a0position,\u00a0because\u00a0the\u00a0refrigeration\u00a0system\u00a0is overloaded during operation, so that the overload protector jumps open.<\/li>\n<\/ul>\n\n\n\n
                                         \n
                                         • Compressor\u00a0operation\u00a0capacitor\u00a0damage,\u00a0may\u00a0be\u00a0usually\u00a0improper\u00a0maintenance\u00a0or\u00a0by\u00a0the\u00a0intrusion\u00a0of moisture.<\/li>\n<\/ul>\n\n\n\n
                                           \n
                                           • The\u00a0compressor\u00a0motor\u00a0is\u00a0burned\u00a0out.<\/li>\n<\/ul>\n\n\n\n

                                             3.\u00a0after\u00a0the\u00a0operation\u00a0of\u00a0the\u00a0air\u00a0conditioner,\u00a0the\u00a0compressor\u00a0starts\u00a0and\u00a0stops frequently:<\/p>\n\n\n\n

                                             \n
                                             • the\u00a0installation\u00a0position\u00a0of\u00a0the\u00a0temperature\u00a0sensing\u00a0package\u00a0of\u00a0the\u00a0thermostat\u00a0is\u00a0too\u00a0close\u00a0to\u00a0the evaporator, so that it is transmitted to the evaporation temperature.<\/li>\n<\/ul>\n\n\n\n
                                               \n
                                               • The\u00a0power\u00a0supply\u00a0voltage\u00a0is\u00a0unstable,\u00a0high\u00a0and\u00a0low.<\/li>\n<\/ul>\n\n\n\n
                                                 \n
                                                 • The\u00a0bimetal\u00a0plate\u00a0of\u00a0the\u00a0overload\u00a0protector\u00a0is\u00a0in\u00a0poor\u00a0contact,\u00a0resulting\u00a0in\u00a0the\u00a0situation\u00a0of\u00a0power\u00a0supply on and off.<\/li>\n<\/ul>\n\n\n\n

                                                   4. the\u00a0compressor\u00a0running\u00a0for\u00a0a\u00a0long\u00a0time\u00a0without\u00a0stopping\u00a0the\u00a0cause\u00a0of\u00a0failure<\/p>\n\n\n\n

                                                   \n
                                                   • Due\u00a0to\u00a0the\u00a0indoor\u00a0heating\u00a0body,\u00a0heat,\u00a0air\u00a0conditioning\u00a0room\u00a0heat\u00a0load\u00a0is\u00a0large,\u00a0the\u00a0air\u00a0conditioner\u00a0and the room do not match.<\/li>\n<\/ul>\n\n\n\n
                                                     \n
                                                     • Due\u00a0to\u00a0the\u00a0rough\u00a0surface\u00a0of\u00a0the\u00a0contact,\u00a0the\u00a0contact\u00a0in\u00a0the\u00a0thermostat\u00a0will\u00a0adhere\u00a0and\u00a0can\u00a0not\u00a0be disconnected.<\/li>\n<\/ul>\n\n\n\n

                                                       5.\u00a0heat\u00a0pump\u00a0type\u00a0air\u00a0conditioner\u00a0does\u00a0not\u00a0heat<\/p>\n\n\n\n

                                                       In the refrigeration operation is normal, and the heating operation is not heated, the electromagnetic reversing valve or switching switch is faulty.<\/p>\n\n\n\n

                                                       \n
                                                       • The\u00a0solenoid\u00a0valve\u00a0coil\u00a0is\u00a0burned\u00a0out\u00a0or\u00a0broken,\u00a0the\u00a0reasons\u00a0are:\u00a0working\u00a0in\u00a0a\u00a0harsh\u00a0environment;\u00a0Coil stop,\u00a0open frequently; Long-term work\u00a0under abnormal\u00a0voltage, resulting\u00a0in\u00a0coil\u00a0often in overtemperature work, insulation aging breakdown.<\/li>\n<\/ul>\n\n\n\n
                                                         \n
                                                         • The\u00a0spool\u00a0in\u00a0the\u00a0solenoid\u00a0valve\u00a0is\u00a0stuck\u00a0or\u00a0damaged.\u00a0The\u00a0reasons\u00a0are:\u00a0sludge\u00a0into\u00a0the\u00a0valve\u00a0and\u00a0block the spool; Poor quality, short service life.<\/li>\n<\/ul>\n\n\n\n
                                                           \n
                                                           • The\u00a0reversing\u00a0valve\u00a0can\u00a0not\u00a0be\u00a0reversed,\u00a0the\u00a0main\u00a0reason\u00a0is\u00a0that\u00a0the\u00a0refrigerant\u00a0is\u00a0not\u00a0clean\u00a0and manufacturing assembly problems, flexible plug can not run.<\/li>\n<\/ul>\n\n\n\n
                                                             \n
                                                             • Hot\u00a0and\u00a0cold\u00a0switch\u00a0failure,\u00a0the\u00a0reason\u00a0is\u00a0that\u00a0the\u00a0mechanism\u00a0is\u00a0damaged,\u00a0the\u00a0surface\u00a0of\u00a0the\u00a0contact\u00a0is oxidized and not conductive.<\/li>\n<\/ul>\n\n\n\n

                                                               6.\u00a0the\u00a0shell\u00a0has\u00a0leakage\u00a0phenomenon,\u00a0hemp\u00a0electricity,\u00a0the\u00a0reason\u00a0is:<\/p>\n\n\n\n

                                                               \n
                                                               • The\u00a0insulation\u00a0performance\u00a0of\u00a0some\u00a0electrical\u00a0appliances\u00a0is\u00a0reduced\u00a0or\u00a0affected\u00a0by\u00a0moisture;<\/li>\n\n\n\n
                                                               • the\u00a0grounding\u00a0wire\u00a0is\u00a0poorly\u00a0grounded\u00a0or\u00a0not\u00a0grounded.<\/li>\n<\/ul>\n\n\n\n

                                                                 (2) The fault phenomenon of the electronic line control system: the control board part is a low voltage control line, and its control voltage is 5V, 9V, 12V or 24V. It is characterized by safety and reliability, control functions, small size, compact control panel, beautiful.<\/p>\n\n\n\n

                                                                 1, the air conditioner no action after the boot: when the forced operation key is pressed, the air conditioner does not act, there is no sound, the power supply is not switched on, can be checked in the following order:<\/p>\n\n\n\n

                                                                 \n
                                                                 • There\u00a0is\u00a0no\u00a0power\u00a0in\u00a0the\u00a0power\u00a0line:\u00a0check\u00a0the\u00a0electrical\u00a0appliances\u00a0that\u00a0control\u00a0the\u00a0power\u00a0line,\u00a0such\u00a0as the knife switch or the air switch, whether to cut off the power supply.<\/li>\n<\/ul>\n\n\n\n
                                                                   \n
                                                                   • The\u00a0power\u00a0supply\u00a0is\u00a0out\u00a0of\u00a0phase.\u00a0The\u00a0power\u00a0supply\u00a0source\u00a0is\u00a0the\u00a0three-phase\u00a0air\u00a0conditioner,\u00a0and\u00a0the three-phase power grid has the possibility of one or two phases losing power.<\/li>\n<\/ul>\n\n\n\n
                                                                     \n
                                                                     • The\u00a0fuse\u00a0of\u00a0the\u00a0control\u00a0board\u00a0of\u00a0the\u00a0indoor\u00a0unit\u00a0is\u00a0blown\u00a0or\u00a0the\u00a0varistor\u00a0is\u00a0damaged.\u00a0In\u00a0order\u00a0to\u00a0prevent too\u00a0high\u00a0voltage\u00a0or\u00a0too\u00a0much\u00a0current\u00a0into\u00a0the\u00a0control\u00a0line,\u00a0protectors\u00a0are\u00a0generally\u00a0installed,\u00a0once\u00a0there\u00a0is\u00a0a high voltage or large current into the control line before cutting off the power to protect the circuit board.<\/li>\n<\/ul>\n\n\n\n
                                                                       \n
                                                                       • The\u00a0connector\u00a0is\u00a0in\u00a0poor\u00a0contact.<\/li>\n<\/ul>\n\n\n\n
                                                                         \n
                                                                         • The\u00a0key switch\u00a0is\u00a0damaged,\u00a0the\u00a0running\u00a0key\u00a0contact\u00a0is\u00a0poor\u00a0or\u00a0the\u00a0key\u00a0parts are\u00a0damaged.<\/li>\n<\/ul>\n\n\n\n
                                                                           \n
                                                                           • The\u00a0circuit\u00a0or\u00a0electronic\u00a0components\u00a0on\u00a0the\u00a0electronic\u00a0control\u00a0board\u00a0are\u00a0damaged,\u00a0so\u00a0that\u00a0the\u00a0control board is out of control, and the circuit of the electric control board should be measured.<\/li>\n<\/ul>\n\n\n\n

                                                                             2.\u00a0after\u00a0starting,\u00a0the\u00a0indoor\u00a0fan\u00a0runs,\u00a0but\u00a0the\u00a0compressor\u00a0does\u00a0not\u00a0run,\u00a0and\u00a0the\u00a0fault\u00a0light\u00a0flashes;\u00a0Check according to the fault guide:<\/p>\n\n\n\n

                                                                             \n
                                                                             • The\u00a0power\u00a0supply\u00a0is\u00a0out\u00a0of\u00a0phase\u00a0or\u00a0the\u00a0voltage\u00a0is\u00a0too\u00a0low,\u00a0to\u00a0check the\u00a0power\u00a0line\u00a0and\u00a0measure\u00a0its voltage value is too low.<\/li>\n<\/ul>\n\n\n\n
                                                                               \n
                                                                               • If\u00a0the\u00a0compressor\u00a0current\u00a0is\u00a0overloaded,\u00a0check\u00a0whether\u00a0the\u00a0thermal\u00a0protector\u00a0on\u00a0the\u00a0compressor\u00a0pump housing is jumping. Usually when the compressor overload after the current is too large, the thermal protector to jump; Three-phase motor protector is buried in the motor winding in the pump shell, regardless\u00a0of\u00a0the\u00a0single-phase\u00a0and\u00a0three-phase\u00a0power\u00a0supply\u00a0motor,\u00a0can\u00a0be\u00a0in\u00a0the\u00a0compressor\u00a0pump\u00a0shell junction\u00a0box\u00a0with\u00a0a\u00a0multimeter\u00a0resistance\u00a0to\u00a0measure\u00a0whether\u00a0the\u00a0winding\u00a0is\u00a0through,\u00a0if\u00a0not,\u00a0the\u00a0protection has been off the power supply, and so on about 5 minutes will generally recover, and then check the cause of overload when running.<\/li>\n<\/ul>\n\n\n\n
                                                                                 \n
                                                                                 • Outdoor fan overheating or thermal protector damage, fan overload operation, the winding temperature rise is too high, the thermal protector will jump and cut off the power supply, you can check whether\u00a0the\u00a0fan\u00a0inlet\u00a0connector\u00a0is\u00a0through.\u00a0If\u00a0it\u00a0is\u00a0not\u00a0possible,\u00a0the\u00a0thermal\u00a0protector\u00a0will\u00a0jump\u00a0and\u00a0recover after cooling. If it is not restored, the thermal protection may be damaged, and the thermal protector should be identified.<\/li>\n<\/ul>\n\n\n\n
                                                                                   \n
                                                                                   • The connector is in poor contact. The wiring of the fan motor is generally inserted with connectors, which\u00a0may\u00a0produce\u00a0poor\u00a0contact.\u00a0In\u00a0addition,\u00a0check\u00a0whether\u00a0the\u00a0connection\u00a0in\u00a0the\u00a0compressor\u00a0pump\u00a0shell junction box is loose and poor contact.<\/li>\n<\/ul>\n\n\n\n
                                                                                     \n
                                                                                     • The\u00a0AC\u00a0contactor\u00a0coil\u00a0is\u00a0broken,\u00a0the\u00a0contact\u00a0can\u00a0not\u00a0be\u00a0closed,\u00a0and\u00a0the\u00a0motor\u00a0has\u00a0no\u00a0power\u00a0to\u00a0enter.<\/li>\n<\/ul>\n\n\n\n
                                                                                       \n
                                                                                       • The\u00a0electronic\u00a0control\u00a0board\u00a0is\u00a0damaged.<\/li>\n<\/ul>\n\n\n\n

                                                                                         3.\u00a0the\u00a0air\u00a0conditioner\u00a0will\u00a0stop\u00a0soon\u00a0after\u00a0start,\u00a0can\u00a0not\u00a0continue\u00a0to\u00a0operate,\u00a0and\u00a0the\u00a0fault\u00a0light\u00a0is\u00a0also flashing; According to the fault guide check:<\/p>\n\n\n\n

                                                                                         \n
                                                                                         • The\u00a0exhaust\u00a0pressure\u00a0is\u00a0too\u00a0high.<\/li>\n<\/ul>\n\n\n\n
                                                                                           \n
                                                                                           • Inspiratory\u00a0pressure\u00a0is\u00a0too\u00a0low.<\/li>\n<\/ul>\n\n\n\n
                                                                                             \n
                                                                                             • The\u00a0fan\u00a0motor\u00a0is burned\u00a0out.<\/li>\n<\/ul>\n\n\n\n
                                                                                               \n
                                                                                               • Compressor\u00a0overcurrent\u00a0overheat\u00a0protector\u00a0action\u00a0jump.<\/li>\n<\/ul>\n\n\n\n

                                                                                                 4. The power indicator lights up after the startup, the indoor fan runs, but the compressor does not run; It indicates that the refrigeration system and the fan system have no fault, but the wrong operation and the temperature control switch are faulty, so the fault indicator does not blink.<\/p>\n\n\n\n

                                                                                                 \n
                                                                                                 • Select\u00a0the\u00a0air\u00a0supply\u00a0mode,\u00a0just\u00a0dial\u00a0the\u00a0cooling\u00a0mode.<\/li>\n<\/ul>\n\n\n\n
                                                                                                   \n
                                                                                                   • The\u00a0temperature does not\u00a0reach\u00a0the\u00a0set\u00a0value.\u00a0When the\u00a0temperature\u00a0setting value\u00a0of the thermostat switch\u00a0is\u00a0higher\u00a0than\u00a0the\u00a0room\u00a0temperature,\u00a0the\u00a0contact\u00a0of\u00a0the\u00a0thermostat\u00a0is\u00a0always\u00a0open,\u00a0the\u00a0refrigeration system will not operate, and the temperature value should be reset.<\/li>\n<\/ul>\n\n\n\n
                                                                                                     \n
                                                                                                     • The sensor of the thermostat - thermistor is damaged, so that the compressor protector temperature control\u00a0is\u00a0out\u00a0of\u00a0control.\u00a0A\u00a0multimeter\u00a0can\u00a0be\u00a0used\u00a0to\u00a0measure\u00a0its\u00a0resistance\u00a0value\u00a0and\u00a0the\u00a0corresponding resistance value of temperature to identify its quality.<\/li>\n<\/ul>\n\n\n\n

                                                                                                       Six, the failure of the ventilation system is manifested in three aspects: the air volume decreases, the motor does not rotate, and the noise is large during operation.<\/p>\n\n\n\n

                                                                                                       \n
                                                                                                       • Decrease\u00a0in\u00a0air\u00a0volume<\/li>\n<\/ul>\n\n\n\n

                                                                                                         1.\u00a0the\u00a0tightening\u00a0screw\u00a0of\u00a0the\u00a0wind\u00a0wheel\u00a0is\u00a0loose:\u00a0when\u00a0the\u00a0motor\u00a0is\u00a0running,\u00a0the\u00a0impeller\u00a0is\u00a0slipping\u00a0and idling, in this case, the air volume decline is quite obvious.<\/p>\n\n\n\n

                                                                                                         2.\u00a0wiring\u00a0error\u00a0caused\u00a0by\u00a0motor\u00a0reversal,\u00a0impeller\u00a0reversal;<\/p>\n\n\n\n

                                                                                                         3.\u00a0the\u00a0filter\u00a0is\u00a0dirty\u00a0and\u00a0blocked:\u00a0the\u00a0flow\u00a0resistance\u00a0of\u00a0the\u00a0air\u00a0will\u00a0increase,\u00a0so\u00a0that\u00a0the\u00a0air\u00a0volume\u00a0will decrease significantly.<\/p>\n\n\n\n

                                                                                                         4.\u00a0condenser\u00a0dirty\u00a0blocking:\u00a0heat\u00a0sink\u00a0dust\u00a0blockage,\u00a0air\u00a0volume\u00a0will\u00a0also\u00a0decrease\u00a0significantly.<\/p>\n\n\n\n

                                                                                                         \n
                                                                                                         • The\u00a0motor\u00a0can\u00a0not\u00a0be\u00a0turned<\/li>\n<\/ul>\n\n\n\n

                                                                                                           1.\u00a0bearing\u00a0serious\u00a0wear:\u00a0the\u00a0rotor\u00a0and\u00a0the\u00a0stator\u00a0unilateral\u00a0friction,\u00a0the\u00a0symptoms\u00a0of\u00a0the\u00a0motor\u00a0is\u00a0buzzing, do not move or the speed is quite low, the current rises. If the power is cut off, rotate the motor shaft by hand, there is a heavy and heavy feeling, and there is friction sound.<\/p>\n\n\n\n

                                                                                                           2.\u00a0motor\u00a0winding\u00a0burned\u00a0out:\u00a0use\u00a0a\u00a0multimeter\u00a0to\u00a0measure\u00a0the\u00a0insulation\u00a0of\u00a0the\u00a0winding\u00a0has\u00a0been\u00a0broken down, and touch the shell; After the fault occurs, electric control protection.<\/p>\n\n\n\n

                                                                                                           3.\u00a0winding\u00a0turn\u00a0to\u00a0turn\u00a0short\u00a0circuit:\u00a0the\u00a0measurement\u00a0resistance\u00a0should\u00a0be\u00a0significantly\u00a0reduced,\u00a0the symptom is that the running current is large, the operation of the moment to blow the fuse.<\/p>\n\n\n\n

                                                                                                           4. The motor sliding bearing is burned, and the shaft can not be turned by hand.<\/p>\n\n\n\n

                                                                                                           \n
                                                                                                           • The\u00a0running\u00a0noise\u00a0is\u00a0large<\/li>\n<\/ul>\n\n\n\n

                                                                                                             1.\u00a0impeller\u00a0and\u00a0wind\u00a0ring\u00a0friction:\u00a0metal\u00a0collision\u00a0sound,\u00a0the\u00a0reason\u00a0is\u00a0that\u00a0the\u00a0fastening\u00a0screw\u00a0is\u00a0loose,\u00a0so that the impeller displacement phenomenon.<\/p>\n\n\n\n

                                                                                                             \n
                                                                                                             • The\u00a0bearing\u00a0is\u00a0seriously\u00a0worn,\u00a0but\u00a0it\u00a0can\u00a0still\u00a0run,\u00a0and\u00a0the\u00a0shaft\u00a0pulsates\u00a0when\u00a0it\u00a0runs.<\/li>\n<\/ul>\n\n\n\n
                                                                                                               \n
                                                                                                               • The\u00a0bolt\u00a0of\u00a0the\u00a0motor\u00a0base\u00a0is loose\u00a0and\u00a0makes a\u00a0jitter\u00a0sound.<\/li>\n<\/ul>\n\n\n\n

                                                                                                                 END!<\/p>","protected":false},"excerpt":{"rendered":"

                                                                                                                 First,\u00a0overview Air\u00a0conditioner\u00a0by\u00a0refrigeration\u00a0system […]<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[12,10],"tags":[],"class_list":["post-6091","post","type-post","status-publish","format-standard","hentry","category-company-news","category-news"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.jiahaorefrigeration.com\/fr\/wp-json\/wp\/v2\/posts\/6091","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.jiahaorefrigeration.com\/fr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.jiahaorefrigeration.com\/fr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.jiahaorefrigeration.com\/fr\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.jiahaorefrigeration.com\/fr\/wp-json\/wp\/v2\/comments?post=6091"}],"version-history":[{"count":2,"href":"https:\/\/www.jiahaorefrigeration.com\/fr\/wp-json\/wp\/v2\/posts\/6091\/revisions"}],"predecessor-version":[{"id":6095,"href":"https:\/\/www.jiahaorefrigeration.com\/fr\/wp-json\/wp\/v2\/posts\/6091\/revisions\/6095"}],"wp:attachment":[{"href":"https:\/\/www.jiahaorefrigeration.com\/fr\/wp-json\/wp\/v2\/media?parent=6091"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.jiahaorefrigeration.com\/fr\/wp-json\/wp\/v2\/categories?post=6091"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.jiahaorefrigeration.com\/fr\/wp-json\/wp\/v2\/tags?post=6091"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}