How to repair the air conditioner by the air conditioner repairman and the repair methods and steps.

Air-conditioning repairman is a profession, although it is often ignored in real life, but we only realize its importance when necessary, especially in hot summer, if air-conditioning products fail, it will greatly increase users' troubles and sometimes even cause unnecessary losses. Accordingly, today's content is about the professional knowledge of air-conditioning maintenance workers, which is especially worth learning for friends who are engaged in this operation.

A, air conditioning repairman repair methods and steps.

1, the air conditioning signal (control) transformer is damaged, which will make the whole machine unable to work. Chigo cabinet air conditioner adopts 220V power supply. After plugging in the power supply, the power supply indicator light does not light up and the whole machine does not respond. The measured 220V power supply is normal. Open the indoor and outdoor cabinets, measure that 220V has been input into the circuit control panel, and the safety tube is intact. Further tests show that the secondary of the control transformer has no output voltage. Remove the transformer and measure the resistance of the primary coil. Secondary resistance is normal. Obviously, the primary coil of the transformer has been damaged. After replacing the new transformer, turn on the power supply, the power supply indicator light is on, and the machine works normally.

2. In summer, the breakdown damage of rheostat on air conditioning circuit is mostly caused by lightning strike. A Mitsubishi PSH-5 and 6G6 cabinet air conditioner did not respond when it was turned on the next day after a thunderstorm. 380V power supply is normal. When the machine shell was opened for inspection, it was found that the 5A fuse was black and the rheostat was broken. After replacing the above two pieces, start the machine for half an hour and observe that it works normally. Obviously, this fault was caused by lightning. I would like to remind our customers that in the summer with more thunderstorms, it is best to unplug the power supply when the weather changes, so as to avoid unnecessary losses.

3. Dirty blockage of condenser and evaporator will affect the refrigeration effect. Wall-mounted, cabinet-type or window-type air conditioners, when the evaporator and condenser are dirty and blocked (such as catkins and dust), will obviously reduce the refrigeration effect, and even appear the phenomenon of no refrigeration. Some users often think that this phenomenon is lack of fluorine, so they will send it to the maintenance department for repair. In fact, when a layer of dirt is attached to the condenser, the condensation effect becomes worse, which will seriously affect the refrigeration. Once dirt is produced on the evaporator surface, the refrigeration capacity cannot be effectively exerted and the refrigeration equipment cannot work normally. Our repair department often encounters such repair cases. Of course, once the dirt is cleaned up, the failure of refrigeration will be eliminated immediately.

4. Judgment and elimination of compressor starting capacitor damage. A 1.5 split air conditioner does not cool after being turned on. The indoor and outdoor fans are running, but the compressor is not working. Turn on the outdoor unit, measure that 220V has reached the terminal, turn off the power supply, and measure whether the resistance of the compressor winding is normal. The starting capacitor of the compressor under test is not charged and discharged, and it is obviously open. After replacing the starting capacitor, correct the fault.

5, air conditioning power cord (and 220V or 380V wiring) capacity is insufficient, resulting in the host does not work.

I have encountered many times when the air conditioner was repaired, because of abnormal power supply, the machine could not work. Fault phenomenon: The 220V power supply was normal before starting, but the voltage measured at the moment of compressor starting was only about 150V, which was mostly due to improper selection of the 220V power supply circuit and thin conductor section. If this failure occurs, just replace the power cord. It is normal to measure 380V before starting, and one phase is just 220V when starting. Check the wires, and one of them has a thin cross section. After replacing the wire, correct the fault. Six, air conditioning three-phase power supply phase sequence error caused the system not to work. The three-phase power supply system of air conditioning sometimes stops because of the wrong phase sequence of the main line, which leads to the failure of the air conditioning protection system. At this time, just adjust the phase sequence of the three phases. The current air conditioning protection system is relatively perfect, and faults can generally be found according to the corresponding fault indicator lights.

Second, how does the air conditioner repairman repair the air conditioner?

The maintenance of fixed frequency air conditioner is mainly divided into three functional modules: 1, detection and maintenance of electronic control system; 2. Inspection and maintenance of refrigeration system; 3. Installation fault detection and maintenance;

Inspection and maintenance of electrical control system: divided into indoor electrical control panel and monitoring and maintenance of electrical parts; Monitoring and Maintenance of Outdoor Electrical Components

Monitoring and maintenance of refrigeration system: including monitoring and maintenance of cut-off valve, heat exchanger, connecting pipeline, four-way valve, compressor, capillary and snow seed;

Monitoring and maintenance of installation faults: it is divided into abnormal faults caused by assembly, installation and maintenance factors such as noise, water leakage and vibration of air deflector;

Necessary maintenance tools;

Basic knowledge of air conditioning;

Basic operating skills;

The knowledge introduced above includes the knowledge points that air-conditioning maintenance workers need to know in the early stage, such as operation methods and step information. In addition, there is still a lot of text space for the introduction of air-conditioning maintenance workers on how to maintain air-conditioning, including the contents that need to be prepared, and the information that we have further analyzed considering the friends who are interested in the operation of related fields but have no knowledge of basic sectors in the past. You can refer to it and screen out the appropriate contents to help ensure good effect advantages in the later stage.

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