1、 Central air conditioning maintenance ideas

1. The problem of automatic shutdown of the whole machine during operation: It often shuts down automatically during use, but can be restarted immediately after starting up. The cooling effect is very good, and the shutdown time is irregular. The power supply voltage was tested with a multimeter and found to be normal. During operation, the voltage at each pole of the motherboard was also normal. After replacing the motherboard and repeating the test, if the problem occasionally appeared, the motherboard was normal. The voltmeter was connected to the internal unit wiring terminal port and repeated the test. It was found that the reading of the voltmeter decreased when the air conditioner was stopped, but immediately recovered to normal. It was suspected that the power supply contact was poor. When the plug was moved by hand, the reading of the voltmeter also swayed. When the power socket was opened, it was found that the screw fastening the neutral wire end was not tightened and ignited. After replacing the new socket and repeating the test, the problem disappeared.

2. Frequent issues with compressor startup: During the use of the machine, it was found that the cooling effect was poor, and the outdoor unit compressor had high operating noise. After on-site inspection of its operating voltage, the compressor started at 223V. At this moment, the cooling effect was still good. After about 10 minutes, the outdoor compressor noise increased. After 7-8 minutes, the compressor stopped, and the internal unit only supplied air. After about 5 minutes, the compressor restarted. After checking the operating environment of the external unit, there was dust on the surface of the condenser, and it was suspected that poor heat dissipation caused the compressor to stop. After cleaning the external unit condenser, the problem still existed during the test run. When opening the external unit casing, it felt that the compressor was particularly cold, and the wiring was checked. There was no problem with the wiring. After connecting the pressure gauge and clamping the ammeter, the compressor was turned on. The pressure was 7Kgfcm2 and the Excessive height causes protection for the press. Carefully observe that the motor speed of the external fan is much slower than before. After replacing the capacitor of the external fan, the fan speed of the test machine increased. At this moment, the operating pressure dropped to 4.8 kgfcm2 and the operating current also decreased to 6 amps. The air conditioning is cooling normally and there is no frequent on-off phenomenon.

3. If the cause of the problem is not identified, forcing the operation will cause overvoltage or overcurrent in the circuit, and then damage normal components. Variable frequency air conditioners commonly use four fuse tubes, which are installed in the power board, bedroom machine control board, outdoor control board, and main power circuit. The fuse is blown due to a short circuit in the corresponding circuit or circuit. If only the fuse tube is replaced without finding the cause, it is likely that its components will be damaged due to overcurrent and overpressure.

Variable frequency air conditioners usually only require 23 capacitors to start, with a capacity between 4802000uf. Problems such as circuit breakers, capacitor breakdowns, parameter changes, power circuits, and flow may occur, which can damage certain components and prevent the compressor from starting properly. To repair a variable frequency air conditioner, it is necessary to first understand the circuit principle and the normal parameters of each component, record the normal data of each key component, and after presenting the problem, measure and compare it to identify and eliminate the problem.

2、 How to maintain central air conditioning

1. Professional technicians should thoroughly clean and maintain the core components of the air conditioner from the inside out for deep maintenance, timely discover hidden problems of the air conditioner, effectively extend its service life, and make it healthier and more energy-efficient. Deep maintenance of air conditioning is usually done once every 23 years.

2. When the air conditioner is not used for a long time during seasonal maintenance, in order to fully dry the interior of the air conditioner, it should be operated in air supply mode for 4 hours, and the fan motor should be lubricated with oil. Then, the power should be cut off, and the air conditioner should be covered with a protective cover. The outdoor unit should be covered with a protective cover to prevent exposure to sunlight and rain. Wipe the remote control clean with a clean, soft dry cloth and remove the battery. When reusing the air conditioner, it is necessary to perform basic cleaning and conduct a running test.