Where the noise comes from in the split system

Many homes have air conditioners, which most often belong to split systems. But after some time of their use, certain problems may arise, for example, the device starts to emit strange and unnatural noise, whistling or hissing. Timely repair and elimination of the cause of the appearance of extraneous sounds helps to prevent a sufficiently serious damage. Noise conditioner for various reasons, but it is worth remembering one thing: all issues should be resolved without delay.

Noise regulations

When acquiring a new technology, a person should not underestimate the level of noise that such devices emit. Sound pressure and vibration, when it exceeds the norm, can bring certain inconveniences and adversely affect human health. There are certain sanitary standardsthat set the level that can penetrate the premises:

• from 7 to 23, the maximum value is 40 dB;
• from 23 to 7 - up to 30 dBa.

Not everyone has the ability to measure the level of extraneous sound using the instrument. To navigate approximately, it is worth remembering the sound of the clock ticking - it is about 30 dB. A normal conversation or wind noise is approximately 40 dBa.

If the sounds emitted by the air conditioner exceed these indicators, then you should definitely take action.

Possible causes of failure

As a rule, an air conditioner consists of two components: an internal and external unit, each of which may produce a not too normal sound, for example, a whistle. It should be noted that, being at home, a person does not notice the work of the external unit, since the latter is located on the street. But the excessive noise of the indoor unit will be immediately noticeable.

In the indoor unit

The most frequent noise in a split system appears after several years of use, especially if periodic maintenance is not performed. But with its regular conduct, similar problems also arise. It is very important to identify in time the nature and background of the hiss, whistle or other sound.

1. If the whistle or other extraneous sound is caused by the improper operation of the fan, then most likely this is due to the need bearing replacement. Often, in this case, the work is accompanied by a roar, and when you turn off the fan immediately stops working. Sometimes when working with a split-system noise can occur when the fan blades cling to other elements or ice. Most often this is due to the fact that over time occurred plastic deformation.
2. Sometimes the hum from the device is heard even after the split-system is turned off, most often this phenomenon is typical of inexpensive devices of Chinese origin. The cause of the whistle becomes transformer malfunctionswhich is best replaced.
   

3. Sometimes it happens that when you turn on the system, a hiss is clearly audible. In the design of the air conditioner there are tubes through which the refrigerant moves. Hiss occurs if occurs tube bend or narrowing of the section, which may be caused by the accumulation of debris.
4. Excessive vibration. Sometimes after a certain period of operation, air conditioners begin to vibrate, so much so that it seems that it will break loose of the fasteners. The main cause of this condition is impeller imbalance, and it can already cause several reasons. First of all, disturbances in the motion of the impeller provoke a banal accumulation of dirt, which is located in uneven layers, and a balancing weight can fall off.
   

5. The whistle can be triggered and failure of the drainage pump. In some cases, it will be enough just to clean it, and sometimes a complete replacement of the element is required. Sometimes a crash occurs when the air conditioner is turned on after a long idle. Pump first works with a bang, and then it stops.

In the external unit

As already noted, the outdoor unit is installed on the street, but despite this, its work is also accompanied by increased extraneous sound, whistling, which often greatly hinders not only the owner of the air conditioner, but also people living next door.

The causes of several.

1. No vibration damping padswhich are made of rubber. Such elements are located between the brackets and the legs of the device, they provide a reduction of vibration.
2. Very often, the mounting bolts are in contact with the iron reinforcement base, hence the impression that the wall vibrates. In addition to changing the location, nothing else can be done.
3. Compressor wear. Extraneous and unnatural sounds and vibrations occur after prolonged use.
   
4. Often there is extraneous sound caused by the penetration of other objects into the lattice or by the clinging of the blades over the ice in the heating mode.
5. Very often extraneous sound causes low quality equipment. Cheap models often have an echo from the elements of the system.

Now we understand the main reasons for the appearance of extraneous sounds. The main thing is to understand that after long-term operation the air conditioner will not function as new, especially if the casing is made mostly of plastic. At the first appearance of noise in split systems, it is worth calling a professional who will help you correctly assess all the risks. Attentive attitude, timely diagnostics and service always guarantee a long and fruitful work of the equipment.