Electronic circuit of the air conditioner. Wiring diagram for air conditioner. General scheme of the air conditioner

Electronic circuit of the air conditioner. Wiring diagram for air conditioner. General scheme of the air conditioner
Electronic circuit of the air conditioner. Wiring diagram for air conditioner. General scheme of the air conditioner
19.10.2019

When buying a room air conditioner, it is very important to choose the right one. specifications and be responsible for the installation. According to statistics, most of the breakdowns of air conditioners occur due to their incorrect and unskilled installation. Correct sequence connections electrical circuit air conditioner is a guarantee of its high-quality and long-term performance. If the air conditioner is still installed incorrectly, then the following negative characteristics may subsequently appear: condensate leakage into the room, freon leakage, etc.

There are two types of installation of air conditioners in the premises: standard and non-standard. Standard installation- the most common, installation of air conditioning near the window, as the compressor is located on the street. It is possible to perform installation in rooms with completed repairs. Such installation is not expensive and does not take much time.
Non-standard installation of an air conditioner is quite expensive and painstaking work, which is recommended to be done only in the process of repairing a room, since it involves chasing the walls.

Regardless of which installation option you choose, in order to avoid all negative consequences, before starting the installation of the air conditioner and fixtures, it is worth finding out important points. For example, such as the external connection diagram and electrical circuit, the device's power supply system, the location of input devices, transverse section wires and future cable routes, find out the characteristic of the wall used for the wiring route. The electrical circuit of the air conditioner must comply with the rules for the installation of electrical installations and regulatory documents. The participation of a professional team of specialists with the necessary equipment is also important.

Air conditioner connection diagram

The electrical connection diagram of the air conditioner includes the laying of external wiring, fixed every 50 cm with special clamps. The electrical wiring that fits into the boxes is attached to the wall using glue and screws, and concealed wiring located in recesses in the wall corrugated pipes attached with clamps.

When choosing a place to install an air conditioner, first of all, you need to take care of aesthetic characteristics: design and interior. It is recommended to install the air conditioner in the under-ceiling area in a place where a lot of time is not spent, as direct currents of cold air can lead to colds.

Refrigerant circuit diagram

Below is a diagram of the refrigeration circuit of the air conditioner.

The diagram was taken not from a textbook, but from the manufacturer's service documentation, therefore the designations are given in English.

Compressor- compressor, "the heart of the air conditioner." The compressor compresses the refrigerant and pumps it around the circuit.

heat exchanger- heat exchanger,

  • outdoor unit - outdoor unit, that is, a condenser, cools the compressed freon below the condensation temperature
  • indoor unit - indoor unit- evaporator, in which the working substance evaporates, lowering the temperature

expansion valve- expansion valve

In another way, TRV is a thermostatic expansion valve. Provides supply required amount coolant.

AT simple air conditioners its role is played by a capillary tube, without any adjustment, in inverter systems- electronic expansion valve.

2 way valve- a two-way valve, that is, a conventional valve, with two positions - open and closed

3 way valve - three-way valve, in the air conditioner, this is the service port to which the pressure gauge hose is connected to measure pressure or charge.

4 way valve- four-way valve, provides refrigerant reversal for air conditioner operation in heating mode

Strainer- filter, in this diagram it is a filter-drier, as it is installed before the expansion valve (and after, since the system can operate in reverse mode and the refrigerant changes its direction of movement).

Its task is to prevent moisture from entering the thin channel of the expansion valve - as moisture will clog it, preventing the refrigerant from passing through.

Muffler- muffler

The arrows indicate the direction of freon movement along the contour:

  • solid arrow - in cooling mode
  • dotted arrow - in heating mode

Also, in more complex and advanced air conditioners, they install:

  • Pressure Sensors
  • liquid refrigerant separators
  • bypass lines
  • injection systems (injection) into the compressor
  • oil separators

Scheme of a multi split system

Multi split system- this air conditioner has one outdoor unit and several indoor

In this case, a few more internal blocks are added, as well as:

distributor- a distributor that splits the refrigerant flow and directs it to several indoor units.

The scheme also contains elements that are used not only in multi systems:

receiver tank- receiver.

The receiver has several purposes - protection against compressor water hammer, freon drain during repairs, etc.

AT this case this is a linear receiver that prevents freon gas from entering the expansion valve


Scheme of electrical connections of the external unit of the split system:

Terminal - terminal block to connect the interconnect cable for connection with the indoor unit.

N- electric neutral

2 - power supply to the compressor from the control board of the indoor unit

3 - supply power to the fan motor for operation at 1st speed

4 - supply power to the fan motor for 2nd speed operation

5 - power supply to the four-way valve actuator for switching to heating mode

Compressor

C- common - common output of the compressor windings

R- running - working winding of the compressor

S- starting - phase-shifting winding of the compressor motor, starting

Internal overload protector- internal overload protection

Compressor Capacitor- an electric capacitor, in this case a working one (there are also starting ones, currently they are not used in air conditioners)

fan motor- engine, fan motor

thermal protector- protection against overheating, usually placed directly on the motor windings and breaks the circuit when the temperature is exceeded.

Fan Motor Capacitor- fan motor run capacitor

SV- solenoid valve - an electromagnetic valve that drives the four-way valve mechanism.

Scheme of the indoor unit of the air conditioner

Terminal block

On the terminal block, in addition to interconnections, there are also clamps for connecting power (power can be supplied and vice versa - to the external unit)

L, N - electric line and single-phase power neutral

Filter Board- filter board, reduces the level of interference in the power supply

Control Board- control board - controls all devices, receives data from all sensors, performs thermoregulation, displays information for the user on the display, performs self-diagnosis.

main relay- the main relay is a power relay that supplies voltage to the compressor.

display board - the display module can be a line of LEDs that show the presence of power, the selected mode, an error code, or a display that also displays the temperature.

Thermistor- thermistor, thermistor, temperature sensor

Room temp. - room temperature sensor

pipe temp. - heat exchanger tube temperature sensor, evaporator

Temperature sensors can also be located in:

    • control panel - to maintain the temperature at the point where the remote control is located (for example, the "I Feel" mode).
    • at the inlet, outlet and midpoint of the evaporator

step motor- stepper motor,

It is used to open louvre grilles, curtains covering the fan

So your dream has come true - an air conditioner has appeared in the house, now the heat in summer period and dampness in the room in the off-season, when the heating has not yet been connected, and it is raining outside the window. Right after installation connection in progress air conditioner to the mains - it must be carried out strictly according to the diagrams indicated on the internal covers of the modules. The instruction manual also contains recommendations for making the connection and spells out the basic requirements for electrical network installation locations.

It must be remembered that the electrical circuit for connecting an air conditioner used in everyday life differs significantly from the similar connection of semi-industrial models that are installed in offices. Homemade have only single-phase connection.

In practice, there are two main ways by which a split system is connected:

  • direct connection through the socket;
  • separate wiring to the electrical panel.

The first option is perfect for everyone home appliances- they are everywhere only in this way are put into operation. Connecting any air conditioning system is carried out in several steps, which must be strictly observed when you decide to do everything yourself.

Scheme of connecting the air conditioner to the mains

The figure shows the connection diagram of the air conditioner to the mains, as well as various connections between the modules of the system, in addition, you will definitely need a circuit diagram of the air conditioner of the purchased model.

First way

Before connecting the product to the network, it is necessary to lay cables from evaporator to outdoor unit:

  • we lay the wire that will connect the two blocks;
  • we draw a separate line to the electrical panel for powerful systems, which includes a cable and an overload protection circuit breaker;
  • average power devices are connected directly through an ordinary outlet.

The last option for connecting an air conditioner is used in certain cases:

  • the power of the product is small;
  • climate system window or mobile class;
  • the apartment has a network of sufficient power;
  • temporary location of the unit;
  • this line must not be connected to other Appliances.

Important! To connect the indoor unit, you need to use reinforced sockets and install a circuit breaker nearby.

It must be taken into account that the operation of the air conditioner takes place on different modes, its power varies from a minimum to a maximum value, therefore, a separate protection must be installed on the connection line.

Each manufacturer, before sending the product for sale, attaches an instruction to it, in which are enclosed:

  • scheme of the product;
  • circuit diagram connections - common;
  • wiring diagram for connecting the external and internal unit.

There is similar information on the surface of the remote unit body and the evaporator cover, but it is applied from the inside. This greatly simplifies the independent connection of any air conditioning system at home.

Under the front panel of the evaporator there is a special box where wiring terminals- this unit of the air conditioner or split system is always mounted indoors.

The wires from the evaporator are connected to the contacts of the outdoor unit, guided by the numbering, the free cores are carefully insulated with a special tape. The schematic diagram will help you understand everything correctly. Before connecting the air conditioning system, check insulation of each core so that later the normal operation of the air conditioner is not interrupted by a short circuit.

Important! If the system diagram is incomprehensible to you, there is no practice in working with electricity, then it’s better not to try to connect the split system yourself, but call a professional.

There are reasons that do not allow the connection of any air conditioning system to the electrical network of an apartment or a country house:

  • old wiring where aluminum wire was used;
  • the cross section of the wires is too small - they will not withstand the load;
  • the condition of the wiring requires its urgent replacement;
  • there is no high-quality grounding, elementary protection against voltage drops.

Air conditioning systems are rather delicate devices, so they should only be connected to serviceable electrical network not to waste family budget for a very expensive repair.

Second way

Experts advise using the most reliable and safe option for connecting an air conditioner - an individual cable that ensures the stability of the device. If you install a separate protection - RCD (device protective shutdown), then it will protect the product from any voltage drop or network overload, and an individual line will allow you to place the system modules anywhere.

Standard requirements for the components of a separate electrical line:

  • necessarily the presence of RCD or AZO(protective shutdown machine);
  • all conductors must be made of copper;
  • the diameter of the wire must correspond to the size prescribed by the manufacturer;
  • equip separate ground for the entire line.

Electric harnesses are passed into a protective hose, then they are placed in a special plastic box design so as not to violate the integrity of the walls. Watch how the professionals make the connection on a special video:

Work algorithm

When House master confident in his abilities and knows perfectly how various household appliances are connected, then he can safely begin work according to a fairly simple scheme.

  1. We select a set necessary tool and the required materials.
  2. We study the schemes proposed by the manufacturer.
  3. We make cable routing to connect the terminals of the outdoor unit to the same connectors on the air conditioner evaporator.
  4. We check the correct operation of all components of the product.

It does not depend on the design of the product, where the cable for connecting to the outlet comes from - from the evaporator or from the external module.

Choosing an outlet

The home outlet must meet certain requirements:

  • welcome differential relay or reliable grounding;
  • it must fully meet all the requirements and parameters that the manufacturers have compiled, according to the annexes in the instructions for using the split system;
  • if electricity is supplied to the outlet by aluminum wires, it must be changed to copper counterparts with a normal cross section;
  • it must be connected to the shield through the circuit breaker.

Modern standard euro sockets ideal for connection household appliances special power, but all work on connecting the air conditioner must be carried out by a specialist with the appropriate approval, otherwise the product warranty will be canceled. If you moved to a new place and decided to install a product that was already working, especially since you did the dismantling yourself, then follow the recommendations and do everything carefully.

We select the wire

To make the correct connection of the air conditioner with your own hands, you must use a wire of only such a section, which is indicated by the manufacturer individually for each model. Household products require the use of a cross section within 1.5-2.5 squares (mm 2), and the current strength will be up to 18 amperes or more, respectively.

If the distance between the system and the electrical panel is up to 10 m, then a cross section of 1.5 mm 2 will do, when the distance is greater, then the cross section increases.

For effective work climate systems use copper wires : for a single-phase connection - 3 cores, for a three-phase version - 5 cores.


Wires are not laid next to pipes heating system and gas supply, the standard distance between communications is not closer than a meter. Electrical harnesses assembled in a protective corrugation are placed in strobes, and secured with special clamps.

When laying communications using boxes, glue and screws are used to fix the wiring. When do concealed wiring , then in the cable strobes they are fixed with special clamps, and then they are plastered building plaster so that you can quickly open it in case of emergency.

We connect the evaporator

In principle, the method of connecting the system modules is identical, with the exception of minor nuances, so we present detailed methodology connection of the internal module, and remote - by analogy with it.


After the connection of both modules is completed, check again correct connection, referring to the diagrams, only after a rigorous check is a trial and short-term switching on of the air conditioner.

In conclusion, I would like to warn all users again: electricity does not forgive mistakes and inaccuracies, therefore, when self-connection adequately treat your skills, so that later you do not have to extinguish the wiring and repair expensive climate equipment.

Content:

AT modern premises already long time air conditioners create the most comfortable climatic conditions. AT hot weather temperature drops to desired value, and in cold weather, a warm microclimate is created in the room. The electrical circuit of the air conditioner is applied in various types and models. They are installed on walls, on the floor and under the ceiling. Thanks to modern design, conditioners organically fit into an interior of any room.

Main types of air conditioners

A variety of designs of air conditioning devices allows them to be used in the most different places. For example, models mobile air conditioners do not require installation work. A special block or hose is removed from the room to the street to remove warm air.

Very simple installation and further maintenance of monoblock devices. There are no connectors in the freon lines, so its leakage is completely excluded. Such air conditioners are distinguished by low noise, high efficiency, however, they have a rather high cost.

Mounting window air conditioners carried out in wall openings or windows. During operation, they produce a lot of noise, but due to their low price, ease of installation and maintenance, they are widely popular with consumers.

Split systems are one of the types of air conditioners. Their design includes an outdoor and indoor unit. Both parts are connected with copper pipes. Freon circulates through these pipes. The outdoor unit consists of a compressor, condenser, fan and throttle. The indoor unit has an evaporator and a fan. There are many modifications of split systems, which allows them to be installed in many places.

General scheme of the air conditioner

Each capacitor contains basic elements that perform certain functions. Inside the outdoor unit is a condenser that converts the gaseous refrigerant into liquid form. Other important element is a choke or expansion valve. With its help, the pressure of the refrigerant decreases when approaching the evaporator. The evaporator itself is made in the form of a radiator installed in the indoor unit.

During pressure reduction, it is here that the transition of the refrigerant from liquid to gaseous form takes place. The compressor compresses the refrigerant and circulates it around. The fans create the air flows needed to blow around the evaporator and condenser. The connection of all the main elements is carried out using copper tubes. As a result, a closed circuit is formed, through which the refrigerant circulates.

Air conditioner electrical equipment

All the main elements of air conditioning systems cannot work by themselves. All work is provided by the electrical circuit of the air conditioner. General scheme includes several main parts. to the indoor unit is carried out using the terminal block Terminal. There are several terminals in the block itself. N is electrical neutral, #2 supplies power from the control board to the compressor, #3 runs the fan at speed one, and #4 at speed two. Terminal 5 supplies power to the 4-way valve actuator when it enters heating mode.

There are three outputs in the compressor itself: C, R and S, denoting, respectively, the common output of the windings, the working winding and the starting winding of the compressor motor for phase shift. Except addition to the scheme protection against overloads and overheating is included, as well as terminals for connecting a fan, a capacitor, solenoid valve and other elements.

How air conditioner works

And where does the refreshing coolness come from on a hot summer day, it is necessary to consider in detail the main principles of air conditioning systems. To do this, it is worth recalling school physics lessons, which dealt with the absorption of heat by a liquid, and a simple experiment: cologne or alcohol was poured onto the hand, which in the process created a pleasant chill. It is this simple principle that is used in modern air conditioners.

What does a standard split system consist of? As a rule, inside it there is a closed circuit along which the liquid moves -. Flowing within the circuit, the refrigerant absorbs heat in one place in order to release it in another. This process takes place in special tubes - which are made of copper and contain transverse partitions from aluminium. For faster processes, air is forced into the heat exchangers, doing this with the help of special fans.

Based on the name of the processes occurring in the heat exchanger, one of them is usually called, and the other -. When the air conditioner works "for heat" it acts as internal evaporator(the part of the air conditioner located in the room), and when working "in the cold" - everything happens the other way around. Such air conditioner working principle but what's the point?

Cold itself is not a finished product, but only a derivative of the transfer of heat with the help of a refrigerant. This process is referred to in the literature as "". Thanks to him, the performance of the air conditioner is obtained in three times higher than its power consumption. At first glance, this may cause bewilderment: 300% efficiency - is this really possible? What is a refrigerant and how can it be transferred from a room where the temperature is about 20 degrees to outside where the temperature is twice as high?

It turns out that everything is much simpler than you might think. Temperature transfer directly depends on pressure, and it does not occur linearly, but monotonously. Thus, during the transportation process, the pressure value becomes higher than the phase transition temperature. The boiled refrigerant changes its state from liquid to vapor and begins to absorb heat from the surrounding air, while the necessary pressure is created in the heat exchanger, at which the phase transition temperature becomes lower than the ambient temperature. In the reverse process, the refrigerant gives up its heat to the air and the junction temperature rises.

One more important detail in the operation of the air conditioner is closed loop, for the creation of which at least two elements are needed: - to increase the pressure and a throttle device - to lower it. The first of them is installed directly in front of the capacitor, and the second in front of.

In general, there are five elements that are indispensable in air conditioners of any type: a closed circuit, an external and internal heat exchanger, a compressor and a throttling device. They are the main component of both the simplest and the most complex split system.

Nowadays, for full-functional operation of the air conditioner, a four-way valve is added to the circuit, thanks to which it can produce both heat and cold. Such a split system is called " reverse cycle air conditioner”, an additional function of which was the transfer of heat from the room to the street and vice versa.


  • 3. Compressor- compresses freon and keeps it moving along the refrigeration circuit. The compressor can be piston or scroll (scroll) type. Reciprocating compressors are cheaper but less reliable than scroll compressors, especially under conditions low temperatures outside air.
  • 5. four way valve- is established in reversible (heat - cold) conditioners. In heating mode, this valve changes the direction of freon movement. At the same time, internal and outdoor unit as if they change places: the indoor unit works for heating, and the outdoor unit works for cooling.
  • 4. Control board- Usually installed on inverter air conditioners. In non-inverter models, they try to place all electronics in the indoor unit, since
  • Large fluctuations in temperature and humidity reduce reliability electronic components.
  • 1. Fan- creates a stream of air blowing around the condenser.
  • AT inexpensive models has only one rotation speed.
  • Such an air conditioner can work stably in a small range of outdoor temperatures. More than high class, designed for a wide temperature range, as well as in all semi-industrial air conditioners, the fan has 2 - 3 fixed rotation speeds or smooth adjustment.
  • 2. Capacitor- a radiator in which freon is cooled and condensed. The air blown through the condenser is heated accordingly.
  • 7. Freon system filter- is installed in front of the compressor inlet and protects it from copper chips and other small particles that may enter the system during the installation of the air conditioner. Of course, if the installation was carried out in violation of the technology and the system got a large number of garbage, the filter will not help.
  • 6. Union connections- connect to them copper pipes connecting the outdoor and indoor units.
  • 8. Protective quick-release cover- closes the fittings and the terminal block used for connection electrical cables. In some models, the protective cover covers only the terminal block, and the fittings remain outside.

Air conditioner indoor unit


  • 1. Front panel- is a plastic grate through which air enters the unit. The panel can be easily removed for maintenance of the air conditioner (cleaning filters, etc.)
  • 2. Filter coarse cleaning - represents plastic mesh and is designed to trap coarse dust, animal hair, etc. For normal operation The air conditioner filter must be cleaned at least twice a month.
  • 5. Evaporator- a radiator in which cold freon is heated and evaporated. The air blown through the radiator is cooled accordingly.
  • 6. Horizontal blinds - adjust direction air flow vertically. These blinds are electrically operated and their position can be adjusted from the remote control. remote control. In addition, blinds can automatically perform oscillatory movements for uniform distribution of air flow throughout the room.
  • 7. Display panel- indicators (light-emitting diodes) are installed on the front panel of the air conditioner, showing the operating mode of the air conditioner and signaling about possible malfunctions.
  • 3. Filter fine cleaning - happens various types: charcoal (removes unpleasant
  • odors), electrostatic (detains fine dust), etc. The presence or absence of fine filters has no effect on the operation of the air conditioner.
  • 4. Fan- has 3 - 4 speeds of rotation.
  • 8. Vertical blinds - serve to adjust the direction of the air flow horizontally. AT domestic air conditioners These shutters can only be adjusted manually. The ability to control from the remote control is only in some models of premium air conditioners.
  • Condensate tray(not shown in the figure) - located under the evaporator and serves to collect condensate (water that forms on the surface of a cold evaporator). Water is drained from the sump through a drain hose.
  • Control board
  • (not shown in the figure) - usually located on the right side of the indoor unit. This board contains an electronics unit with a central microprocessor.
  • Union connections
  • (not shown in the picture) -
  • located at the bottom rear of the indoor unit. Copper pipes connecting the outdoor and indoor units are connected to them.

The principle of operation of the air conditioner

Any air conditioner consists of two parts with different functions: refrigeration circuit which performs the function of cooling the air and electrical part, which controls devices and contour elements.

This article will discuss the electrical circuit of the air conditioner, the options for connecting it to the power supply and how to properly connect the air conditioner to the mains.

What is the electrical circuit of a split system

An air conditioner wiring diagram is a document that shows the location of electronic components, their connection, as well as information for engineers. service centers. Everyone who is involved is more interested in the electrical connection diagram of the air conditioner, which includes the location of the main evaporative and capacitor unit, terminals for connecting the blocks to each other and connecting the power supply.

The main elements here are:

  • Compressor, with CSR outputs. The arrow shows the protection installed on the compressor winding
  • Compressorcapacitor - a capacitor, with two leads connected to the windings of the compressor unit. The third terminal of the capacitor is connected to its starting winding.
  • In addition, the diagram shows a fan motor and a capacitor through which two motor windings are connected.
  • The diagram shows an electromagnet that controls the operation of a four-way valve.

Terminal designations in the terminal block:

1(N) is zero.

3 - Power supply to the fan motor when it is running at low speeds.

4 - Power supply to the fan motor when it is running at high speeds.

Separate terminal - ground.
Main modules and blocks:

  • Power filter through which voltage is supplied to the control board.
  • Control board is a control unit to which all device modules are connected.
  • The compressor power relay is connected to CN 12.
  • A drain pump is connected to CN6.
  • The CN 5 terminal block is responsible for controlling the split system fan.
  • To the terminals of CN 10, a stepper motor for controlling the louvre is connected.
  • The CN 7 terminals are responsible for connecting the heat exchanger temperature sensor.
  • A room temperature sensor is connected to terminals 1 and 2 of the CN15 terminal block.
  • A water level sensor in the sump is connected to terminals 1 and 3 of the CN15 terminal block.
  • Terminal block CN 13 of the control unit is responsible for connecting the display unit of the device.

Terminal block (marked on the board as Terminal) for connecting the evaporator and condenser units with a cable. Terminals L and N - power supply of the air conditioner from the electric line. gears. You should know what exists with connecting the air conditioner to the mains through an external unit.

With this connection, you must follow the instructions. If climatic equipment with a power of up to 4.5 kW is connected, then a four-core copper cable with a cross section of 2.5 mm 2 should be used. With a separate power branch, a 20 A automatic machine must be installed on the shield.

Connecting an air conditioner

After that, they must be interconnected with a four-core copper cable with a cross-sectional area of ​​\u200b\u200bthe core of at least 2.5 mm 2. The connection instruction is a circuit diagram, which was discussed in sufficient detail above. The connecting cable can be laid together with the freon line, or maybe in a separate plastic box.

When laying in one strobe together with copper pipes, use a corrugated plastic tube to insulate the cable.

After interblock electrical connection connect the indoor unit to the power supply. The scheme for connecting the air conditioner to the mains involves receiving power both from the nearest outlet and from a separate line.

The ideal connection option is powerful enough climate technology is a separate power line. This option will not load the already existing lines of the apartment electrical system and will allow you to supply power directly to the indoor unit of the split system. The laying of the power cable from the shield to the indoor unit can be carried out along a grooved groove in the wall material or in a special plastic box.

The shield from which a separate power line will be drawn must be grounded. Connecting the power cable to the terminal block of the shield should be carried out only through the machine, the power of which should be calculated according to the formula: the power of the device divided by the voltage. 30% of the margin should be added to the resulting value.

It should be understood that the power cable for climate control equipment can be connected to the outlet only if:

  • The air conditioner has little power.
  • The intra-house electrical network is laid with a copper cable with a cross section of at least 2.5 mm 2.
  • There are no energy-intensive consumers on the same branch with air conditioning.
  • Supposed to be temporary.
  • This branch of power supply is equipped with an automatic device with an RCD of at least 20 A.

Options for connecting an air conditioner to an existing power line

This issue could not be considered, due to the presence of sockets in the room. But, some owners of low-power climate equipment are unhappy with the stretching wire from the outlet to the consumer, often through the entire wall.

If the outlet is far enough from the air conditioner, then there is an option to connect the air conditioner to the mains through a switch. We warn you right away: this option is only suitable for low-power climate equipment and here's why: terminals conventional switch can simply not withstand the current passing through them. As a result, heating, sparking, failure of the switch (at best) or fire.

It is better to make a groove in the wall from the existing outlet and lay the power cable through it in the corrugated pipe to the split system unit, and then mount it in the wall special socket with decorative overlay. The socket must withstand a certain current: if the power is 1 kW, then the socket must withstand 9-10 A; from 1 to 3 kW - 16-18 A; from 3 to 4.6 kW - 20 A; from 4.6 to 5.5 - at least 25 A. Right choice best left to a qualified electrician.

If you decide to connect the air conditioner with your own hands, then do it in compliance with all safety regulations, and in order to be completely sure that the connection process went correctly and safely for the climate control equipment and the inhabitants of the home, it is best to seek help from professionals.