Indoor unit of the air conditioner: device, types and disassembly

A split-system air conditioner is a device, the outdoor unit of which is removed outside the building or structure. The internal one, in turn, in addition to cooling, takes over the functions that control the operation of the entire system. A split air conditioner makes it possible to cool the air in a room much faster than its counterpart - a monoblock, in which all units are too close to each other.

Indoor unit of split air conditioner consists of a number of important parts and functional units.

1. The block body is the basis of the product, insensitive to temperature extremes. Manufactured from high quality plastic designed for aggressive conditions.
2. Front removable grill providing heated air inlet and cooled air outlet.
3. Coarse filter that retains fluff, large particles. Designed to cleanse at least once every two weeks.
4. An evaporator coil is a device that transfers cold or heat (depending on the operating mode) into the interior of a building or structure.
5. A radiator that allows the refrigerant (freon) to heat up and evaporate.
6. Display panel with LEDs - informs about operating modes, load level, warns of possible danger of device failure.
7. A fan (blower) that allows the air flow to move at different speeds. The revolutions of its motor are regulated smoothly or stepwise.
8. Vertical and horizontal electric shutters - automatic shutters that direct the flow of cooled air to the desired place in the room.
9. Fine filter that traps airborne dust.
10. Electronic control and management module.
11. Condensate trap for collecting water droplets protruding from the evaporator.
12. The module with nozzles, to which the “track” is connected, are copper tubes for the output of hot and cold freon into the internal evaporator. Tubes at the other ends are connected to the coil of the outdoor unit of the air conditioner - the corresponding outputs of the room unit are located at the back, closer to one of its sides.

The split air conditioner itself, despite dozens of details, is ingeniously simple to operate. The working medium for the air conditioner, as well as for the refrigerator, is a refrigerant (freon). Being in a liquefied state, it takes away heat during evaporation. By absorbing heat, the air in the room is effectively cooled.

The circuit is arranged in such a way that the split air conditioner works as follows:

• as soon as both units are connected to the network, and the operating mode is selected, the blowing fan is turned on;
• the blower draws the heated air in the room into the indoor unit - and delivers it to the heat exchanger coil;
• the freon that has begun to evaporate removes heat, turning from a liquid into a gas, from this the temperature of the refrigerant drops;
• cold gaseous freon lowers the temperature of the air directed by the fan to the evaporator, upon reaching the temperature specified when setting the operating mode, the indoor unit turns on the fan again, blowing the cooled portion of air back into the room.

The cycle is restarted. This is how the air conditioner maintains the set temperature in the room.

The main function of the indoor unit is to cool the room in summer and heat it in winter. But modern split air conditioners have a number of additional functions and capabilities, for example:

• self-diagnosis sensor, which makes it possible to identify the most common problems and notify the owner about them;
• the ability to set the operating mode from a smartphone or tablet;
• nodes and modules that prevent the air conditioner from deviating from a specific operating mode;
• LCD screen with detailed indication of the operating mode of the air conditioner;
• built-in ionizer - enriches the air with healthy negative ions;
• auto-swinging curtains is an effective measure against constant draft;
• changing the fan speed to suit your preferences;
• automatic choice between cooling and heating - in the off-season with significant daily temperature fluctuations;
• work timer - makes it possible not to "drive" the air conditioner when you are not indoors;
• prevention of coil icing in the heat exchanger - reduces the number of compressor starts and stops, which prolongs the life of the device.

Parameters by which the air conditioner is assessed (in terms of the indoor unit):

• power output for heating and cooling (in watts);
• the same, but the values ​​of the consumed electric power (similar);
• operating current for cooling and heating the room (in amperes);
• the amount of air to be cooled (number of cubic meters per hour);
• noise pollution (noise level in decibels);
• diameter of pipelines (for liquid and gaseous freon, in millimeters);
• limiting length of pipelines (routes, in meters);
• maximum difference in height between outdoor and indoor units;
• dimensions and weight (in millimeters and kilograms, respectively).

For the outdoor unit, the main ones are the noise figure, dimensions and weight.

At the dawn of their century, split air conditioners were produced in a single version: a wall-mounted indoor unit suspended close to the ceiling. Now the following options are produced: wall, cassette, wall-ceiling, duct, column and mobile. Each type of indoor unit is good for some types of premises and bad for others., at the same time it can boast of the presence of certain parameters, which air conditioners of a different type of performance do not have. The buyer determines what size block is suitable for his case and with what fasteners and structures he will hang it.

The wall-mounted indoor unit of the air conditioner appeared earlier than other options. Over the years, it has gained a truly impressive popularity. This view is placed exclusively in the room. It absorbs warm air, giving out already cooled air instead. The outdoor unit, located on the outer side of the load-bearing wall, is connected to the indoor unit using wiring and "routing".

The advantages of the wall unit are as follows:

• compactness - a solution for small rooms;
• very low noise level;
• a large set of functions and capabilities in modern and more expensive models (for example, some air conditioners often act as an air ionizer);
• the design is such that the block itself will organically fit into the interior of any room.

In a cassette form, the indoor unit is connected to the Armstrong suspended ceiling compartments. The sides of the unit can be easily hidden if the distance between the false ceiling and the ceiling allows this. At the same time, it is easy to save free space in the room - the walls are free. Relevant for rooms with low (2.5 ... 3 m) ceilings.

Pros:

• effective air cooling from above (directly from the ceiling);
• switching operating modes using a remote or wall-mounted remote control;
• hiding from strangers;
• increased power.

Cassette indoor units are the most efficient.They are an obligatory attribute of restaurants or cafes, shops, offices or shopping and entertainment centers. Suitable for rooms separated by partitions, where installation of an air conditioner in each such compartment would be costly.

Minuses:

• a suspended ceiling is required;
• difficulties when installing in a pre-prepared place: the ceiling should be easy to disassemble.

The indoor unit of such an air conditioner is placed horizontally (on the ceiling). Vertical installation - on the wall near the floor. The area of ​​application is a large room without a false ceiling, where the performance of the wall unit will not be enough. The demand for such air conditioners is among the owners of sales areas and offices.

Pros:

• high cooling capacity;
• suitability for elongated, round, curly rooms;
• comfortable temperature throughout the room;
• the absence of drafts, which subsequently cause colds in visitors.

Ducted air conditioners are designed to cool entire floors and buildings or a group of offices located nearby, several apartments on the same floor. Indoor units are installed behind false ceilings or hidden in the attic. Only ventilation grilles of channels and devices protrude outward, carrying blown cold and blown out heated air. The channel system is complex.

Advantages:

• hiding devices and channels from the eyes of visitors;
• communication with outside air at moments when the cooling is turned off;
• lowering the temperature to comfortable values ​​in several rooms at once.

Disadvantages of a duct cooling system:

• the complexity of installation, time costs;
• uneven temperature drop in different rooms.

The column system is the most powerful of all known. It is used in halls and shopping and entertainment centers - on hundreds and thousands of square meters of territory. The column block is placed in an adjacent (technical) room.

Such a system is also not without its disadvantages:

• large mass of the column module;
• extreme cold near the air conditioner.

The second drawback easily turns into a plus: a refrigeration room is organized in the technical room, where perishable products need emergency cooling, for which the air conditioner turns on at a power above average and maintains the temperature around zero. Excess cold is discharged into the common room using supply and exhaust ventilation.

The advantage of a mobile air conditioner is ease of movement. It weighs no more (or a little more) than a vacuum cleaner.

Disadvantages:

• punching a hole in the outer wall of a house or building for an air duct, however, it is implemented in the form of a plug with thermal insulation, which is closed for the winter;
• troubles when draining condensate;
• low, in comparison with blocks of other types, productivity.

Dismantling the air conditioner requires care. Most often they ask how to open the indoor unit of a wall-mounted air conditioner. Unplug it and do the following:

• lift the cover of the indoor unit, pull out and wash the mesh filters;
• unscrew the self-tapping screws under the curtains of the air conditioner blinds and near the filters - and slightly open the lower part of the case;
• pull it towards you and unclip the clips;
• remove the auxiliary parts from the body (if any);
• dismantle the drain pan, into which the condensate is drained, to do this, unscrew the screws and unscrew the lock, remove the blind motor, remove the tray and the end of the drain hose;
• unscrew and remove the left side of the coil with the radiator;
• loosen the screw inside the shaft by a couple of turns and carefully pull it out.

In a more complex design, the ECU board and shaft engine are removed. If you are not very sure, call specialists. Clean and flush the fan shaft, radiator with coil.You may need a "Karcher" - a pressure washer, turned on at a reduced speed. Reassemble the indoor unit of the air conditioner in the reverse order, turn it on and test it in operation. Cooling speed and efficiency should be significantly increased.

For information on the types of indoor units of the air conditioner, see the next video.