Answer: The rumbling sound of the air conditioner is abnormal noise. My experience is to find the cause from the following aspects: soft connector falling off, abnormal noise of the wind wheel shell, trembling of the air outlet and whether the air duct is abnormal. ; Next, I will talk about my views and solutions based on these three aspects.
Generally, air conditioners that make the rumbling noise mentioned by the subject are mostly concealed air conditioners, that is, duct air conditioners or multi-split indoor units. I rarely encounter wall-mounted machines that produce "rumbling" sounds. Such abnormal noises are generally caused by the deformation of the casing. No matter what type of air conditioner there is abnormal noise, it is certain that there is an internal problem.
The internal structure of the concealed air conditioner is generally composed of a casing, a heat exchanger, a fan, and an air duct shell. In addition, for installation needs, there is a soft joint part; the soft joint part is divided into aluminum foil, tin foil, There are two kinds of woven fabrics. They are mainly used to connect the air outlet of the air conditioner and the ceiling (louver air outlet) to prevent the wind from running into the ceiling. Chassis: Generally made of cold-rolled steel plates. It is easy to find that the four corners are not installed flatly, but there will be no rumbling sound. Some are fixed with hanging bars without reinforcement and stretching in the middle. The machine will make noise when running. It's called "Zhi Zhi". The evaporator sometimes makes a sound when heating in winter, but it is a "chacha" sound. This is the sound of surface thermal expansion caused by uneven heating of the refrigerant and the evaporator. The fan, that is, the motor, has two types: fixed-speed and variable-speed fans, both of which require lubricating oil for maintenance. If it lacks maintenance over time, it will also make a sound, but it will be a sharp "gurgling" sound. Wind wheel and wind wheel shell: Its main function here in the internal unit is to generate airflow to allow indoor air to enter the internal unit for heat exchange. Therefore, it will also make noise, and it is easy for the wind wheel shell to break or have cracks. When the wind wheel starts to rotate, a situation similar to the "rumbling" mentioned by the subject will occur. Soft joints: Between aluminum foil and tinfoil soft joints and woven fabric soft joints, aluminum foil and tinfoil are widely used in air conditioners in the field of home decoration. Mainly because the cost of aluminum foil and tinfoil is cheaper than woven fabrics, so business owners are not willing to use it. In addition, installation Even simpler, aluminum foil can be bonded (it comes with its own adhesive), so the installer is willing to use it.
The installation of woven fabrics is much more troublesome and requires special shaping and fixing, so many workers are reluctant to use it (only in engineering installation, due to fire audits, they will be used ).
Our air conditioner uses aluminum foil and tinfoil to connect the air conditioning outlet and the ceiling. Usually the aluminum foil tinfoil at the top of the ceiling is directly bonded to our wooden frame. When our air conditioner is heating , the adhesive surface of aluminum foil and tin foil is easy to peel off due to heat or is not firmly bonded. When the air conditioner is turned on in summer, the soft joint will fall off and block the air outlet. When the wind blows, the aluminum foil and tin foil will make a "rumbling" sound. Trembling noise from the air outlet: Abnormal noise from the air outlet will not be rumbling, but usually changes with the air volume. If not, it can be eliminated directly. In addition, if you have an air duct in your home, that is, you have changed the air outlet and return modes of the machine, pay attention to check the integrity of the air duct. The air duct will also make a "rumbling" sound, but home decoration generally Most of the wind comes from the side, so you just need to pay more attention.
After we know where the air conditioner in our home is likely to make noise and the characteristics of the noise, we can make targeted observations. From the previous article, we can narrow down the fault point to the air duct, air duct shell and soft joint. If there is an air duct, pay attention to check here.
For soft connection, we only need to stand in front of the wind outlet or stand on a ladder to observe closely. The chance of cracks in the hairdryer shell is very small, but we have to investigate one by one with a dialectical attitude. Summary
If you are a user of the concealed air conditioner I am talking about, you should have an idea of ??where the problem is. If the soft connection comes off, you can usually handle it yourself and just re-fix it with screws. If not, I suggest you contact a professional maintenance person to come to your home. At least you know where they should check, at least they shouldn't just check the outdoor unit and say they need to add fluoride.