The compressor of the split system is humming heavily

Why does the air conditioner make noise?

In a normal condition, the air conditioners are characterized by a homogeneous working noise. In some (budget) models the sound power is higher, in high-quality models the noise is hardly noticeable for people around, because people quickly get used to such “noise curtain” and stop hearing.

Unusual noises are always the sign of breakage or any failure. They can appear in equipment that has been in operation for several years or in a brand new one. In the first case, if you call a master, he will immediately ask how often the maintenance was carried out, because regular preventive measures allow you to avoid all kinds of breakdowns and prevent critical errors. In the second case the technician at once will start to define a noise source.

Noise norms of air conditioner

Noise level of climate control equipment during operation is regulated by current sanitary standards.

Not everyone has a special device to measure noise in the room. In order to understand if the noise level of air conditioner exceeds the norms, you can compare it with the sound level of working mechanical clock, as it is approximately equal 30 dBa, or with usual people talks, where the noise level is 40 dBa.

Diagnosing and troubleshooting air conditioners

Diagnosing air conditioner malfunctions, if they do not appear in self-diagnostics, is not an easy task, requiring an understanding of the parts and components within the equipment.

The construction of splitsystem, with all its apparent complexity, can be easily understood even without special training. It includes:

  • Evaporator with the heat exchanger (radiator) in the indoor unit, designed for taking heat from the indoor air of the serviced premise.
  • Condenser with a radiator in the outdoor unit, which removes heat into the surrounding space.
  • Fans creating airflow through radiators.
  • The compressor, which provides the pressure needed to circulate freon.
  • Electronic control block, receiving signals of task and sensors, giving control commands to all nodes of splitsystem.

The condenser, evaporator and compressor are all piped together to form a cooling circuit in which the heat-carrying refrigerant circulates. In each of these units malfunctions may occur, causing the air conditioner to stop working or malfunction.

Freon circuit malfunction

The evaporator and condenser change their purpose when working on heating a room with an air conditioner. Freon pumped into the system enters the evaporator in a liquid state. Here it condenses and gets very hot, up to 60-80 degrees. The compressor pumps warm air and warms the room. This is the reverse process of refrigeration, in which a liquid is formed from the gas directly in the condenser unit.

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From the evaporator, the liquid freon flows into the outdoor unit, and this liquid can “bubble”. The structure in which the processes of freon evaporation and further condensation take place is completely isolated. If the air conditioner is in working condition, this phenomenon is impossible in principle.

Freon circulates in copper pipes that are sometimes damaged during installation, which breaks the integrity of the system and leads to the refrigerant leakage, its partial replacement by the atmospheric air or moisture. Because of different compression densities of substances that have entered the system, gurgling noises occur.

Noise from the air conditioner during operation can be eliminated in different ways. It depends on what the cause of the problem is. Let’s consider what causes this most often, and how to solve the problem yourself.

After turning on the device, a crackling sound is heard. This can be caused by an expansion of its housing due to temperature rise. In most cases, this problem only appears for a short time and resolves itself. It is not necessary to pay attention to it.

A noise with a faint crackling sound occurs if the fan’s impeller has been damaged or the compressor has broken. The defective elements need to be replaced.

If you hear a rattle when you turn the fan on, most often it is because the fixing is not secure enough. They need to be checked to tighten if necessary.

compressor, split, system

In the case of vibrations, the amplitude of which increases, it indicates a serious problem that must be solved as soon as possible. It happens because of the compressor breakage. Also, such vibrations are caused by unbalanced drive on the fan or motor. Repair can be performed by a qualified technician.

The air conditioner can vibrate during operation also because the unit has not been installed correctly. It is necessary to remove the unit and make the installation correctly.

After turning on the air conditioner started hissing? It is necessary to check the condition of the freon pipes. There may be breaks or refrigerant leaking out. In this situation you need to call a master.

Do not ignore the strong sounds that arise during the operation of your air conditioner. If they are minor malfunctions you can easily enough eliminate them. If you repair your air conditioner in time, it will help prevent serious problems with the unit that lead to costly repairs or the need to buy a new air conditioner.

Clicks and knocks when turned off

Before and after switching on you hear loud and sharp clicks or monotonous banging? This can occur when the thin, low quality plastic material overheats or overcools. It is possible to eliminate annoying noises by buying another model of splitsystem with a body from more qualitative material. Only then will the “shell” not undergo changes when turning on and switching modes.

compressor, split, system

Scheduled inspections and regular cleaning guarantee a long life. How often should you check the condition of the air conditioner?? Focus on the following factors:

If an air conditioner is installed in a city apartment or office, it is possible to clean the inside unit once or twice a month. It is enough to clean outside unit from dirt and dust once a year.

How to check compressor defective or not full tutorial.

How to understand that it’s time to clean? If the device began to cool or heat a premise worse, it is time to wash parts of the system.

The main reasons of noise of the outside and inside unit

If uncharacteristic noises of your air conditioner appear you should apply to a service organization. But you have to be ready to incur considerable expenses while repairing your climatic equipment. By the nature of the sound you can determine the cause with a high degree of probability and then decide on methods of its elimination. The algorithm of independent actions is the following: at appearance of a strong noise, first of all, it is necessary to define in what unit it occurs and to establish the nature of the noise. Unusual noise in the split-system indoor unit

compressor, split, system
  • Rattling noise of the fan is heard. The problem can be in the fan bearing, in the change of geometry of the impeller. The problem can also appear because of the ice formation on which the fan blades cling during the device operation.
  • There is rather strong low sound. As a rule the problem lies in electric part of splitsystem indoor unit, namely transformer. Transformer begins to hum before its failure or because of weak fixing.
  • Sizzling is caused by refrigerant leaks, changes in tube diameter due to kinking, clogged tubes, etc.
  • Big noise caused by vibration. As a rule, the problem lies in an unbalanced impeller.
  • Hum may be caused by dirty filters and heat exchanger.

Besides the above mentioned, quite often the noise from inside of the air conditioner is caused by the problems with the drainage pump, which should be cleaned and if the problems are still there. replaced.

Loud noise in the outside unit of split-system

Sounds, about the air conditioner condenser unit can make the fan, compressor, and guard grille. In addition, there are noises that occur due to improper or insufficient mounting of the unit to the wall. Let’s consider them in details.

  • Rumble, produced by the vibration of the air conditioner outer block. As a rule, the problem is the lack of vibration absorbers on the mountings. It happens that the problem appeared because of the great depth to which the anchor bolts are recessed in the wall. The bolt can contact with the reinforcement of the slab and transmit vibration to the entire wall.
  • A worn compressor can make quite a lot of noise.
  • Noise can be produced by the guard grille, which is poorly fixed on the air conditioner.
  • An unbalanced impeller makes a rattling noise when the blades catch on the heat exchanger or the unit’s protective structure.

Noise from outside air conditioner unit when there is a big ice layer interfering with the fan operation.

compressor, split, system

Frequent questions

Most likely the problem is a freon leak or lack of freon. Only expert could define it accurately.

Working with freon is quite difficult. You should undertake it only if you are absolutely sure of your abilities or if you understand the risk and responsibility for the possible damage of air conditioner. Besides you will need a professional manometric manifold.

Be sure to. Any inspection and intervention begins with disconnecting power to the unit.

Quite. The normal inclination of the block does not exceed 5 degrees. If you have more, try adjusting the housing position and observe the sound changes.

Once every 2-3 weeks in a dirty room and once every 2-3 months with regular cleaning and maintaining order.

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