Why is the air con­di­tion­er noisy — this ques­tion begins to wor­ry many hap­py own­ers of such cli­mate tech­nol­o­gy, espe­cial­ly after sev­er­al years of its use. It is rather dif­fi­cult to answer this ques­tion, since there are a great many rea­sons for increased noise. Only one thing can be said unequiv­o­cal­ly: it is nec­es­sary to solve this prob­lem with­out delay in order to pre­vent seri­ous dam­age and fail­ure of this expen­sive cli­mate con­trol equip­ment.

Noise standards for climate technology

The con­se­quences of the noise that air con­di­tion­ers can cre­ate should not be under­es­ti­mat­ed, because vibra­tion and sound pres­sure can cause seri­ous incon­ve­nience not only to the own­er of the equip­ment, but also to his neigh­bors. In gen­er­al, the noise lev­el is nor­mal­ized by the cur­rent san­i­tary stan­dards. Based on SN 2.2.4/2.1.8.562–96, the per­mis­si­ble pen­e­trat­ing noise lev­el in res­i­den­tial premis­es is:

  • from 700 up to 2300 – 40 dBa;
  • since 2300 up to 700 – 30 dBa.

Not every­one has a device with which you can mea­sure the lev­el of sound emit­ted by your cli­mate con­trol equip­ment. To under­stand how much it is allowed by the norms of 30 dB, one should imag­ine the tick­ing of a clock. The sound lev­el emit­ted by the oper­a­tion of a mechan­i­cal watch is approx­i­mate­ly 30 dB. A nor­mal human con­ver­sa­tion in a room cre­ates a sound pres­sure equiv­a­lent to 40 dB noise.Noise level of climate equipment If you under­stand that the noise lev­el of the air con­di­tion­er exceeds the spec­i­fied fig­ures, then urgent action must be tak­en.

Main Causes of Outdoor and Indoor Unit Noise

If you expe­ri­ence unusu­al sounds from your air con­di­tion­er, you should con­tact a ser­vice orga­ni­za­tion. But you need to be pre­pared for sig­nif­i­cant costs when repair­ing your cli­mate con­trol equip­ment. By the nature of the sound, you can most like­ly deter­mine the cause your­self with a high degree of prob­a­bil­i­ty and then decide on meth­ods for elim­i­nat­ing it. The algo­rithm of inde­pen­dent actions is as fol­lows: when a strong noise appears, first of all, it is nec­es­sary to deter­mine in which block it appears and to estab­lish the nature of the noise that has appeared. Unchar­ac­ter­is­tic noise in the indoor unit of the split sys­tem

  • A rum­ble is heard when the fan is run­ning. The prob­lem may be in the fan bear­ing, in chang­ing the geom­e­try of the impeller. The prob­lem may also appear due to the for­ma­tion of ice, for which the fan blades cling to when the device is oper­at­ing.
  • A fair­ly strong low-fre­quen­cy sound is heard. The prob­lem lies, as a rule, in the elec­tri­cal part of the indoor unit of the split sys­tem, name­ly in the trans­former. The trans­former starts buzzing before fail­ure or due to loose fas­ten­ing.low frequency sound
  • Hiss­ing occurs when the refrig­er­ant leaks, when the diam­e­ter of the pipes changes due to their kink, when the pipes are clogged, etc.
  • Loud noise caused by vibra­tion. As a rule, the prob­lem lies in an unbal­anced impeller.
  • The hum can be caused by dirty fil­ters and heat exchang­er.

In addi­tion to all of the above, the indoor unit of the air con­di­tion­er often makes noise due to prob­lems with the drainage pump, which needs to be cleaned, and if the prob­lems per­sist, then replace it.

Loud noise in the out­door unit of the split sys­tem

Sounds about the con­dens­ing unit of an air con­di­tion­er can be made by a fan, com­pres­sor, and guard grill. In addi­tion, there are nois­es that occur due to incor­rect or insuf­fi­cient fix­ing of the device to the wall. Let’s con­sid­er them in more detail.

  • The hum pro­duced by the vibra­tion of the out­door unit of the air con­di­tion­er. As a rule, the prob­lem is the lack of vibra­tion dampers on the mounts. It hap­pens that the prob­lem arose due to the great depth to which the anchor bolts are recessed in the wall. The bolt can come into con­tact with the slab rein­force­ment and trans­mit the vibra­tion to the entire wall.
  • A suf­fi­cient­ly strong sound can cre­ate a worn out com­pres­sor.
  • Noise can be cre­at­ed by a pro­tec­tive grille that is poor­ly fixed to the air con­di­tion­er.
  • An unbal­anced impeller makes a rum­ble when the blades cling to the heat exchang­er or the pro­tec­tive struc­ture of the device.

The out­door unit of the air con­di­tion­er makes noise when a large lay­er of ice forms, which inter­feres with the oper­a­tion of the fan.

Ways to eliminate the causes of increased air conditioner noise

It should be under­stood that only minor prob­lems that cause a loud sound of work­ing cli­mate equip­ment can be elim­i­nat­ed on their own.

  1. If the noise source is an impeller that has changed geom­e­try or is unbal­anced due to mechan­i­cal dam­age, then it should be replaced. This can be done inde­pen­dent­ly only if the own­er has suf­fi­cient knowl­edge and tools.
  2. If the noise occurs in the event of ice for­ma­tion, then remov­ing it is easy to get rid of the source of the loud sound.
  3. The most com­mon cause of unbal­anced fan blades is ordi­nary dirt. Inspect and wash the impeller with a brush and deter­gent.Outdoor unit icing
  4. You can try to fix the vibrat­ing trans­former by tight­en­ing its fas­ten­ers. If a spring acts as a fas­ten­er, then try to short­en it, after which the vibra­tion will become notice­ably less.
  5. If the guard rail makes loud nois­es, it can be fixed by drilling addi­tion­al holes and installing bolts next to the stan­dard mounts.

All oth­er prob­lems are solved only by spe­cial­ists.

If you can­not accu­rate­ly diag­nose the source of loud sound in your split sys­tem, or are unsure of your abil­i­ties, then do not be self-moti­vat­ed and con­tact pro­fes­sion­als.

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