Change air conditioner technician in one second

Change air conditioner technician in one second

Air conditioning is an indispensable tool for preventing heat at home, and whether it is cold winter or scorching heat, the air conditioner always keeps the room temperature comfortable and pleasant, but what should I do if the air conditioner fails? How should friends judge where the air conditioner is faulty? This is just a technical job.

　　 Today, the editor of okmarts.com brings you some common inspection steps when air-conditioning fails, turning into an expert in one minute, so that irregular troops have nowhere to hide. now, anyone who is interested can have a look together with us.

　　 When the air-conditioning and refrigeration system is running, the initial inspection adopts the method of touching, seeing and listening. These methods are simple and effective.

　　 Touch:

　　 After 20-30 minutes of normal operation of the compressor, touch the temperature of the suction pipe, exhaust pipe, compressor, evaporator outlet, condenser, etc., and judge the cooling effect by hand.

　　Compressor temperature is generally 90-100℃. Touch the surface temperature of the evaporator. The temperature of the evaporator of a working air conditioner should be the same everywhere, its surface is cold, generally around 15 degrees, and there is condensation on the exposed copper pipe elbow. & Touch the surface temperature of the condenser. After the air conditioner is turned on, the condenser will heat up soon. The faster it heats, the faster the refrigeration. Under normal use, the temperature of the condenser can reach about 80 degrees, and the temperature of the condenser tube wall is generally 45-55 degrees. . Touch the surface temperature of the low pressure return air pipe. Normally, the suction pipe is cold and the exhaust pipe is hot. It should feel cold to the hand. If the ambient temperature is low, there will be condensation on the surface of the low-pressure return pipe. If the return pipe does not condense, and the high-pressure exhaust pipe is hot, the compressor shell is also very hot, which is probably a refrigerant. Insufficient, if all condensation on the return pipe of the compressor and half or all of the compressor casing, it means that the refrigerant is too much. Feel the temperature of the high-pressure exhaust pipe. It should feel hot to the touch, and hot in summer. Touch the surface temperature of the dryer filter. Under normal circumstances, the surface of the filter dryer feels slightly higher than the ambient temperature when touched by hand. If there is a cold feeling or condensation, it means that the filter drier is slightly blocked. Find out the air outlet temperature. The hand should feel a little cool in the wind, and the hand will feel a little cold if it stays for a long time.

Look:

　　 First, check whether the shape of the air conditioner is intact and whether the various components are working properly. Secondly, check whether there are breaks in the pipes of the refrigeration system, and whether there are oil traces at each welding point. If there are oil traces at the welding point, there may be leakage. Then carefully check whether the inserts of the electrical components are loose, whether the positions of the connecting copper pipes are correct, and whether the copper pipes touch the shell. Finally, check whether the beating of the centrifugal fan blade and the axial fan blade is too large, and whether the motor and compressor have obvious vibration. Check whether the high and low pressure values are normal. When the ambient temperature is 30 degrees, the low pressure is about 0.49~0.54Mpa, the high pressure is about 1.17~1.37MPa, when the ambient temperature is 35 degrees, the low pressure is about 0.58~0.62Mpa, and the high pressure is about 1.93Mpa, when the ambient temperature is 43 degrees, the low pressure is about 0.68Mpa, and the high pressure is about 2.31Mpa. Look at the frost on the low pressure part of the capillary.

　　 During normal refrigeration, at the beginning of the compressor operation, a thin layer of frost will form on the capillary tube, and then it will gradually melt away, but the phenomenon of insufficient refrigerant or blockage of the pipeline will cause the frost to hang up. It is worth noting that when the outdoor heat exchanger works in a heat pump cycle in winter, it is a low-pressure, low-temperature component, and refrigerant leakage and blockage may also occur. If there is frost on the pipe section from the outlet of the capillary tube to the inlet of the outdoor heat exchanger and the other parts are dry, it indicates that the capillary tube is half blocked. On the surface, the phenomenon of insufficient refrigerant and semi-clogging are the same. It should also be pointed out that when the air conditioner is running, you should generally take a look at the external working conditions of the air conditioner, such as whether the indoor and outdoor ambient temperature is too high or too low, whether the filter is too dirty or whether there is poor ventilation, etc., in order to eliminate Factors such as external reasons and improper installation and use.

Change the air conditioner technician in one second

　　Listen:

　　 listen carefully to see if the sound of the whole machine is normal. When the air conditioner is running, it will make a certain sound, but if you hear some abnormal sound, it will be a problem. For example, when the compressor is running, there is a "humming" sound, which can immediately be determined that the compressor motor cannot start normally At this time, you should turn off the power immediately and find the cause; the "hissing" sound is the high-pressure airflow sound generated after the high-pressure damping tube in the compressor is broken; the "clicking" sound is the collision sound of the metal inside the compressor; "Dangdang" sound is the impact sound of the suspension spring in the compressor falling off or breaking. For open-type compressors, there will generally be a slight and uniform "click" or a slight "di" tapping sound of the valve plate; if there is a "through" sound, it is the sound of compressor liquid hammering, that is, there is a large amount of refrigerant The keyway of the suction compressor flywheel is matched with the sound of loose impact; the "pap" sound is the slap of the belt after damage.

　　 Listen to the running sound of centrifugal fan and axial flow fan should be balanced and even, if there is rubbing or the axis is not right, abnormal sound will appear. When shutting down, when you hear a lighter and lighter airflow sound like "sizzling" (emitted when the system pressure is balanced), you know that the system is basically not blocked. In addition, other noises can also be judged by hearing, such as: the sound of the extension axial fan hitting the iron sheet of the casing; the "squeaking" sound of the fan being out of oil; the "chattering" of the centrifugal fan and the foam casing of the fan Sound; the sound of loosening and vibration of the bottom corner bolts of the compressor; the sound of the capillary tube touching the shell.