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    Data Center Refrigeration System 41 Questions and Answers

    How to repair the air conditioner compressor failure In summer, air conditioning is used more often, and the cooling effect of the air conditioner depends on the compressor, so once the cooling effect disappears, it means that the compressor has failed. So, how to repair the air conditioner compressor failure? Next, let's take a look at the maintenance method of the air conditioner compressor. Wooden hammer percussion method for air conditioner compressor failure maintenance: tilt the air conditioner front, back, left and right by 45 °, then turn on, and use a wooden hammer to hit the lower half of the air conditioner compressor, so that the internal parts of the air conditioner compressor are stuck It vibrates and runs. The newly installed air conditioner has a failure of the air conditioner compressor not to start. It may be that the air conditioner is placed for a long time, so that the piston assembly is still in a state for a long time. In addition, the thick viscosity of frozen oil in winter is also a reason, the use of wooden hammer knocking method can eliminate the fault. The strong way to repair the fault of the air conditioner compressor: use a 220v10a plug. Three wires with a length of 1.5 meters and a cross-section of 1.5 square millimeters are used to make a starting tool. The N terminal wire of the plug is connected to the common terminal C of the air conditioner compressor, the L terminal dipole wire, one M terminal around the air conditioner compressor, and the other The line is dangling. When the air conditioner compressor is energized, lightly touch the start terminal S of the compressor with this line to start the air conditioner compressor. After the air conditioner compressor is started, quickly remove the line touched, pay attention to safety. When stopping, dial the power plug first, then disconnect the wire, and then connect the air conditioner compressor wire. The test machine air conditioner returned to normal. Pressure relief method for fault repair of air-conditioning compressor: measurement of resistance of air-conditioning compressor winding is normal. The air-conditioning compressor still cannot be operated by the above three methods. Finally, the refrigerant is discharged from the low-pressure gas container of the outdoor unit, and then the lower half of the air-conditioning compressor is knocked at the same time when the power is turned on, and the air-conditioning compressor runs quickly. At this time, 200 ml of freezing oil can be sucked from the low-pressure gas plus fluoride. After the air conditioner compressor is operating normally, the low-pressure gas can be cut in and the low-pressure liquid can be cut in. Finally suppress, leak test, evacuate, add fluoride, the air conditioner compressor returns to normal. Air pressure compressor method for air conditioner compressor fault maintenance: the socket voltage is normal, the outdoor unit shell is disassembled, the compressor capacitance is well charged and discharged, the overheat and overcurrent protector is well measured, and the resistance of the main winding and auxiliary winding of the air conditioning compressor is equal to the public End value. The above four methods did not work, and finally the air pressure impact method was used. First, the refrigerant needs to be released, and the high-pressure and low-pressure pipes of the air-conditioning compressor are welded away by gas welding, and a 1.5-meter-long 10mm-diameter copper pipe is welded to the high-pressure outlet pipe of the air-conditioning compressor. The other end is connected to the decompression outlet of the nitrogen bottle with a nanotube, and a reaction force of 0.1 MPa is applied to the air conditioner compressor internal parts with nitrogen to loosen the shaft holding parts. Exhale air for 5 minutes with a low-pressure suction port, and then test the machine with a forced lift method. The air conditioner compressor is easily started to run. After the air conditioner compressor runs normally, the current is measured to be 4.3 amperes, and then the high pressure and low pressure pipes are welded, finally pressed, leak checked, evacuated, fluorinated, and the air conditioner compressor returns to normal. Capacitor start method for air conditioner compressor fault maintenance: measure the power supply is normal, open the outdoor unit casing, measure the air conditioner compressor start capacitor, charge and discharge well, measure the three terminals of the air conditioner compressor, the main winding M plus the auxiliary winding S resistance value is approximately equal to Common resistance C. The use of the wooden hammer knocking method and the strong lifting method do not work. Finally, the increased capacitance starting method is used to easily start the air conditioning compressor. The capacitor starting method is based on the strong starting method, and a 70μF capacitor is connected to the pole line of the S terminal. The starting torque of the air-conditioning compressor can be increased by 5% after the capacitor is connected at the starting end. But after the air conditioner compressor is started, the running time should not be too long, because the air conditioner compressor will overheat after the capacitor is increased at the start end of the air conditioner compressor. The start coil is easy to burn. Lubrication method for air conditioner compressor fault maintenance: disassemble the outdoor unit shell, measure all parameters normally, the above five methods are not effective, and finally have to remove the air conditioner compressor, pour out the oil in the air conditioner compressor is black and red. Then fill the kerosene from the high-pressure outlet and low-pressure suction port of the air-conditioning compressor, and then pour it out, repeating 4 times, the purpose is to wash out the varnish and copper oxide scale peeled off from the air-conditioning compressor. After the air conditioner compressor is cleaned with kerosene, turn the air conditioner compressor upside down for 12 hours to control out the kerosene remaining in the air conditioner compressor and volatilize the kerosene. Then add No. 25 refrigeration oil to start adding a little more oil. After finishing, pick up the air conditioner compressor to the hard ground and pier 2-3 times, so that the air conditioner compressor will be vibrated at the holding axis to help start. Then connect the three terminal wires of the air-conditioning compressor by the capacitor starting method. The air-conditioning compressor can be easily started and operated, allowing the air-conditioning compressor to operate for 1 hour, draining the excess oil in the air-conditioning compressor, and using the air conditioner in the air-conditioning compressor. The heat of the compressor itself evaporates, and the current measured by an ammeter is 4.4a. Finally, reinstall the air-conditioning compressor, weld the high-pressure and low-pressure welding ports, pressure test, leak detection, evacuation, add fluoride, the air-conditioning compressor returns to normal.

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