KR101195556B1 - A air conditioner and control method thereof - Google Patents

Abstract

The present invention relates to an air conditioner and a control method thereof, and an object of the present invention is to control an operation method of two compressors in three stages, thereby increasing the utilization of cooling capacity and minimizing power consumption. In providing a method.

In addition, another object of the present invention is to provide an air conditioner and control method capable of maintaining a proper discharge temperature and creating a comfortable indoor environment by controlling the position and area of the air discharge port in three stages according to the operation method of the compressor. have.

To this end, the present invention provides a control method of an air conditioner capable of varying a capacity of a refrigerant by using two compressors, the first operation mode of driving a first compressor having a smaller capacity among the plurality of compressors, The operation step is controlled in a second operation mode for driving a large second compressor and a third operation mode for driving the first compressor and the second compressor.

Description

Air conditioner and control method

1 is a structural diagram showing an indoor unit of a conventional air conditioner.

2 is a diagram illustrating an operation mode of a conventional air conditioner.

FIG. 3 is a table illustrating the comfort level according to the operation state and the discharge port of the compressor according to the operation mode shown in FIG. 2.

4 is a structural diagram showing an indoor unit of an air conditioner according to an embodiment of the present invention.

5 is a refrigerant flow diagram of an air conditioner according to an embodiment of the present invention.

FIG. 6 is a block diagram illustrating components of the air conditioner shown in FIG. 5.

7 is a diagram illustrating an operation mode of an air conditioner according to an embodiment of the present invention.

FIG. 8 is a table illustrating the comfort level according to the operation state and the discharge port of the compressor according to the operation mode shown in FIG. 7.

9 is a graph showing the pressure change of the compressor according to an embodiment of the present invention.

10 to 12 are flowcharts illustrating a control method of the air conditioner according to the first embodiment of the present invention.

13 is a flowchart illustrating a control method of an air conditioner according to a second embodiment of the present invention.

Explanation of symbols on the main parts of the drawings                 

10: outdoor unit

11a, 11b: first and second compressors

20: indoor unit

26a, 26b: first and second discharge ports

27a, 27b: 1st, 2nd discharge port drive part

30: micom

The present invention relates to an air conditioner and a control method thereof, and more particularly, to an air conditioner and a method of controlling the air conditioner which can provide a comfortable indoor environment by changing a discharge port according to a driving method of two compressors.

In general, an air conditioner includes a compressor for converting a low-temperature, low-pressure gaseous refrigerant into a high-temperature, high-pressure gaseous refrigerant, and a condenser for converting a high-temperature, high-pressure gaseous refrigerant converted from the compressor into a high-temperature, high-pressure liquid state refrigerant. And an evaporator for converting the liquid refrigerant at high temperature and high pressure converted from the condenser into a liquid refrigerant at low temperature and low pressure, and a direction switching valve for changing the flow path of the refrigerant according to the cooling and heating mode.

In addition, as shown in FIG. 1, an indoor unit of the air conditioner has an air outlet 2 formed at an upper end of the indoor unit to discharge air cooled by heat exchange in an evaporator (not shown). The display unit 3 for displaying the driving state is located in the center of the indoor unit 1.

Recently, by using a plurality of compressors having different capacities, the compression capacity of the refrigerant can be varied according to the cooling load or the heating load, so that the cooling load or the heating load can be appropriately responded and the cooling or heating efficiency can be optimized. Has to help.

In a system using a plurality of compressors, it is common to employ two constant speed compressors, and the two compressors are designed to have different capacities. That is, when two compressors are operated at the same time, the cooling capacity of 100% is obtained, and when only a small capacity compressor is operated, the cooling capacity of about 40% is obtained.

In the conventional air conditioner using two compressors, as shown in FIG. 2, two compressors 1a and 1b are simultaneously operated (two-stage operation) according to the indoor load, and the compressor is small when the room temperature reaches the set temperature. Only 1b) is controlled to be independent operation (single stage operation). This aims to improve the energy efficiency by varying the capacity of the compressor. In addition, if the user uses the power saving mode, only the small capacity compressor 1b can be operated independently, and the two compressors 1a and 1b can be operated simultaneously when the two-stage operation is selected to ensure cooling capability even in the power saving mode. Do. Meanwhile, the air cooled in the indoor unit 1 is discharged through the discharge port 2 located at the upper end of the indoor unit 1 regardless of the compressor operation method.

As described above, in the case of the conventional air conditioner using two compressors, as shown in FIG. 3, two stages of simultaneous operation of two compressors according to a user's operation mode selection, and only one compressor of small capacity operating alone. Only driving is possible. In addition, air is discharged at the same air flow rate and wind speed through the same discharge port 2 (same discharge area) regardless of each operation step.

As the air is discharged through the same discharge port, the air is discharged with an excessive amount of air than is required for a small-capacity compressor, which increases the temperature of the discharged air, and decreases the dehumidifying effect that the user feels comfortable. There was a problem.

In addition, since the compressor's operation method is controlled in two stages, the cooling capacity is only used at 100% or 40%. Therefore, the cooling capacity of the compressor is not adequately responded to fluctuations in the indoor load or the user's choice of active cooling capacity. Even without the two compressors run simultaneously, there was a problem that the power consumption increases.

The present invention is to solve the above problems, an object of the present invention is to control the operation method of the two compressors in three stages to increase the utilization of the cooling capacity and to minimize the power consumption air conditioner and its control method In providing.

In addition, another object of the present invention is to provide an air conditioner and control method capable of maintaining a proper discharge temperature and creating a comfortable indoor environment by controlling the position and area of the air discharge port in three stages according to the operation method of the compressor. have.

In addition, another object of the present invention is to provide an air conditioner and a control method thereof so that the user does not feel uncomfortable by minimizing the waiting time even when the operation mode is changed.

The present invention for achieving the above object is a control method of an air conditioner that can change the capacity of the refrigerant using at least one or more compressors, the operation is controlled in three operation modes according to the driving state of the compressor do.

In addition, the operation mode of the third stage includes a first operation mode in which a first compressor having a small capacity is driven, a second operation mode in which a second compressor having a large capacity is driven, and driving both the first compressor and the second compressor. It characterized in that it is configured as a third operating mode.

In addition, the discharge position of the air is changed according to the operation mode of the three steps.

In addition, the air is discharged to the first discharge port located in the front center of the air conditioner when operating in the first operation mode, the air is discharged to the second discharge port located on the left and right sides of the air conditioner when operating in the second operation mode. The air is discharged, and the air is discharged to the first discharge port and the second discharge port when operating in the third operation mode.

In addition, the discharge area and the amount of air increases as the third operation mode of the three operation modes increase.

In addition, in the control method of the air conditioner capable of varying the capacity of the refrigerant by using a plurality of compressors, the discharge position of the air is changed in accordance with the driving state of the plurality of compressors.

In addition, when the first compressor of the plurality of compressors having a smaller capacity is driven, the air is discharged to the first discharge port located in the front center of the air conditioner.                     

In addition, when the second compressor having a larger capacity among the plurality of compressors is driven, air is discharged to the second discharge ports located on the left and right sides of the air conditioner.

In addition, when all of the plurality of compressors are driven, the air is discharged to the first discharge port and the second discharge port respectively located in the front center and left and right sides of the air conditioner.

In addition, a control method of an air conditioner capable of varying a capacity of a refrigerant by using two compressors, the first operation mode of driving a first compressor having a smaller capacity among the plurality of compressors, and a second compressor having a larger capacity The operation step is controlled in a second operation mode for driving the first compressor and a third operation mode for driving the first compressor and the second compressor.

In addition, when the change signal is input to the first operation mode during operation in the third operation mode, the second compressor is stopped and the operation of the first compressor is characterized in that to continue.

In addition, when a change signal is input to the third operation mode during operation in the first operation mode, if the cumulative operation time of the first operation mode is less than a preset reference time, the operation of the first compressor is stopped, and the preset delay time. After the elapse of time, the first compressor and the second compressor are driven.

In addition, when the cumulative operation time of the first operation mode is equal to or greater than the reference time, the second compressor may be further driven while the driving of the first compressor is continued.

In addition, when a change signal is input to the second operation mode during operation in the first operation mode, if the cumulative operation time of the first operation mode is less than a preset reference time, the operation of the first compressor is stopped, and the preset delay is performed. When the time elapses, the second compressor is driven.

In addition, when the cumulative operation time of the first operation mode is equal to or greater than the reference time, the operation of the first compressor is stopped and the second compressor is driven.

In addition, when the change signal is input to the second operation mode during operation in the first operation mode, the operation of the first compressor is stopped, and if the pressure balance of the second compressor is achieved, the second compressor is driven. do.

The apparatus further includes a plurality of compressors capable of varying the capacity of the refrigerant according to a load, a plurality of discharge ports, and a control unit controlling the discharge state of the plurality of discharge ports in accordance with an operation mode of the plurality of compressors.

The operation mode may include a first operation mode for driving a first compressor having a smaller capacity among the plurality of compressors, a second operation mode for driving a second compressor having a larger capacity among the plurality of compressors, and the first compressor. And a third driving mode for driving the second compressor.

In addition, the plurality of discharge ports, characterized in that it comprises a first discharge port located in the front center of the air conditioner, and the second discharge port located on the left and right sides of the air conditioner.

In addition, when operating in the first operation mode, air is discharged through the first discharge port, when operating in the second operation mode, air is discharged through the second discharge port, and when operating in the third operation mode. Air is discharged through the first discharge port and the second discharge port.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

4 is a structural diagram of an indoor unit according to an embodiment of the present invention, in which air outlets 26a and 26b are formed at the front center and left and right sides of the indoor unit 20, respectively. The discharge area of the second discharge port 26b located on the left and right sides is about twice as large as that of the first discharge port 26a located at the front center. The first discharge port 26a and the second discharge port 26b are controlled to discharge air to only one of them according to the operating condition of the air conditioner or to discharge the air through both discharge ports 26a and 26b.

5 and 6, the air conditioner according to the present invention comprises an outdoor unit 10 which forms a normal refrigerant cycle, and an indoor unit 20 connected to the outdoor unit 10 to perform indoor cooling and heating. A refrigerant pipe is installed between the indoor unit 20 and the outdoor unit 10.

The outdoor unit 10 includes a plurality of compressors 11 for compressing a refrigerant, check valves 12a and 12b for preventing a refrigerant backflow to the compressor 11 which is not operated, and refrigerants discharged from each compressor 11. Four-way valve 13 for adjusting the flow direction, an outdoor heat exchanger 14 for receiving heat compressed by the refrigerant from each compressor 11 and exchanging heat with the outside air, and an outdoor fan forcibly blowing air to the outdoor heat exchanger 14. 15 and an outdoor fan motor 16 for rotating the outdoor fan 15.                     

In addition, the outdoor unit 10 is closed at the time of cooling operation and is installed in parallel with the outdoor electric valve 17 which expands the refrigerant by adjusting the opening degree during the heating operation, and the outdoor electric valve 17 to bypass the refrigerant only during the cooling operation. And an accumulator 19 for storing the excess refrigerant generated according to the compression capacity and delivering the excess refrigerant to the compressor 11 in a gaseous state.

The plurality of compressors 11 are composed of two constant speed type compressors, and are designed such that the ratio of cooling capacity of each compressor 11 is about 6: 4. When the first compressor (11a) with a small capacity has a cooling capacity of about 30 to 50%, and when the second compressor (11b) with a large capacity has a cooling capacity of about 50 to 70%, the first When both the compressor (11a) and the second compressor (11b) is driven can be operated with a cooling capacity of 100%.

On the other hand, the indoor unit 20 is an indoor heat exchanger 21 in which heat exchange is performed after indoor air is sucked, and indoor air is sucked from the outside of the indoor unit 20 and passes through the indoor heat exchanger 21, and then again the indoor unit ( An indoor fan 22 to discharge to the outside of the 20, and the indoor fan motor 23 for rotating the indoor fan 22.

In addition, in the pipe connected to the indoor heat exchanger 21, a pipe in which the refrigerant is sucked during the cooling operation is installed with an indoor electric valve 24 for expanding the refrigerant, and the refrigerant discharged from the indoor heat exchanger 21 flows during the cooling operation. In the piping, when a failure occurs in the indoor unit 20 itself or when a communication error occurs between the indoor unit 20 and the outdoor unit 10, the refrigerant flowing through the indoor heat exchanger 21 automatically or by a control command of the microcomputer 30 is generated. Refrigerant control valve 25 for adjusting the flow is installed.                     

In addition, the first discharge port 26a according to the operation state of the key input unit 31 and the first compressor 11a and the second compressor 11b to input operation information such as the operation mode, the set air volume, and the set temperature selected by the user. ) And the first discharge port drive unit 27a and the second discharge port drive unit 27b for controlling the opening and closing of the second discharge port 26b, the display unit 32 for displaying the operation state of the air conditioner, and the indoor unit 20. And a microcomputer 30 for controlling various devices of the outdoor unit 10.

As shown in FIGS. 7 and 8, an air conditioner using two constant speed compressors according to the present invention independently or simultaneously operates two compressors 11 having different capacities according to fluctuations in an indoor load or a user's selection. To perform a total of three steps of operation. That is, three stages of operation of two compressors 11 simultaneously, two stages of operation of the second compressor 11b having a large capacity alone, and one stage of operation of the first compressor 11a having a small capacity alone. Can be distinguished.

In the first stage operation, the air cooled in the indoor heat exchanger 21 of the indoor unit 20 is discharged through the first discharge port 26a in the front center, and has a cooling capacity of about 30 to 50% of the total cooling capacity. . Air cooled in the indoor unit 20 during two-stage operation is discharged through the second discharge port 26b on the left and right sides, and occupies about 50 to 70% of the cooling capacity. In the third stage operation, the cooled air is discharged through the first discharge port 26a and the second discharge port 26b, and is operated with a cooling capacity of 100%.

As described above, the driving state of the compressor 11 and the positions of the air outlets 26a and 26b are changed according to the operation stage of the three stages. In addition, the area and the air volume of the air outlets 26a and 26b are controlled to decrease from three stages to the first stage so that the temperature of the air discharged through the outlets 26a and 26b is maintained at about 13 to 14 degrees.

Meanwhile, during operation of the air conditioner according to the present invention, an operation step may be frequently changed according to a change in indoor temperature or a user's operation mode selection. In Table 1 below, each operation mode of the air conditioner is changed. Indicates.

NO Initial operation mode Change operation mode One 3-stage (1st compressor ON, 2nd compressor ON) 2 stage (1st compressor OFF, 2nd compressor ON) 2 3-stage (1st compressor ON, 2nd compressor ON) 1st stage (1st compressor ON, 2nd compressor OFF) 3 2 stage (1st compressor OFF, 2nd compressor ON) 3-stage (1st compressor ON, 2nd compressor ON) 4 2 stage (1st compressor OFF, 2nd compressor ON) 1st stage (1st compressor ON, 2nd compressor OFF) 5 1st stage (1st compressor ON, 2nd compressor OFF) 3-stage (1st compressor ON, 2nd compressor ON) 6 1st stage (1st compressor ON, 2nd compressor OFF) 2 stage (1st compressor OFF, 2nd compressor ON)

<Table 1>

As described above, when the compressor 11 that is stopped due to the change of the operation mode is to be operated, there is a problem that the compressor 11 must be started after the pressure balance is made. FIG. 9 shows the pressure change of the first compressor 11a and the second compressor 11b when the air conditioner is in the stopped state and starts operation in the first stage operation. When the first stage operation is started, the discharge port and the suction port of the first compressor 11a are rapidly changed to high pressure and low pressure, and the suction port of the stationary second compressor 11b is gradually changed to low pressure so that the time of Ts (A region) When this elapses, the pressure of the suction port of the first compressor 11a becomes the same. If the second compressor (11b) is to be started by changing the operation mode during the first stage operation, the second compressor (11b) must be started after the time Ts has elapsed after the first stage operation starts.

However, since the time that the pressing equilibrium is made varies depending on the specifications of each air conditioner and the state of the compressor 11, when the compressor 11 to be stopped is to be operated, the compressor 11 in operation is stopped. After a predetermined time Ts required to achieve the pressure balance has elapsed, it may be controlled to perform the next step of operation. On the other hand, even after a certain amount of time (Ts) has elapsed, the compressor 11 can be started immediately after the pressure balance has been made, so whether the pressure balance is detected using a pressure sensor (not shown), etc. Driving can be performed.

Hereinafter, a control method of an air conditioner according to each operation mode change shown in Table 1 will be described with reference to FIGS. 10 to 12.

First, FIG. 10 illustrates a control method when the operation mode is changed to one stage or two stage operation among three stage operations. If the user selects the three-stage operation through the key input unit 31, or if the three-stage operation is selected due to the increase in the cooling load due to the increase in the indoor temperature, the microcomputer 30 controls each driving device to perform the three-stage operation. (S100) Accordingly, both the first compressor 11a and the second compressor 11b start operation, and the first discharge port drive unit 27a and the second discharge port drive unit 27b are the first discharge port 26a. And the second discharge port 26b are opened to discharge the cooled air to the first discharge port 26a and the second discharge port 26b.

When the operation mode change signal is input due to the user's selection or the change of the indoor load during the 3-stage operation, the microcomputer 30 determines whether the operation mode has been changed from the third stage to the second stage. If the first compressor (11a) is stopped (S130), the first discharge port drive unit (27a) is controlled to close the first discharge port (26a) to change the discharge port in accordance with the two-stage operation. (S140) And, the second compressor The two-stage operation is performed while continuing the driving of (11b). (S150)

If it is determined in step 120 that the operation is not the second stage, it is determined whether the operation mode has been changed from the third stage to the first stage. (S160) If the operation mode is changed to the first stage, the second compressor 11b is stopped (S170). By controlling the second discharge port drive unit 27b, the second discharge port 26b is closed to change the discharge port according to the first stage operation. (S180) Then, the first compressor 11a is driven to perform the first stage operation. If it is determined in step 160 that the first stage operation is not selected, the operation mode is maintained because there is no change in the operation mode. (S200) In this case, when the operation mode is changed from the third stage operation to the first stage or the second stage operation. Operation is performed according to the changed operation mode immediately without additional delay time.

Next, FIGS. 11A and 11B illustrate a control method when the operation mode is changed to two or three stages during the first stage operation. When the first stage operation is selected according to the user's operation mode selection or the indoor load, the microcomputer 30 performs the first stage operation by controlling each driving device. (S210) Accordingly, the first compressor 11a starts to start. The first discharge port 26a is controlled to open the first discharge port 26a. (S220) The air cooled in the evaporator by the operation of the first compressor 11a is allowed to enter the room only through the first discharge port 26a. It will be discharged.

When the operation mode change signal is input during the first stage operation, the microcomputer 30 determines whether the corresponding signal is a signal for changing the operation mode to three stages. (S230) If the third stage operation is selected, the first stage operation is performed. After the start of operation, it is determined whether the cumulative operation time has passed the predetermined time Ts. (S240) If the cumulative operation time is less than the time Ts, the first compressor 11a in operation is stopped. (S250) After the stop state is maintained for a predetermined time (3 minutes) required for equilibrium (S260), the first compressor 11a and the second compressor 11b are started. (S270) In step 230, the cumulative operation of the first stage operation is performed. If the time is Ts or more, the second compressor 11b is additionally started immediately without stopping the first compressor 11a. (S300)

When the first compressor 11a and the second compressor 11b are started, the first discharge port drive unit 27a and the second discharge port drive unit 27b open both the first discharge port 26a and the second discharge port 26b. After that, start the three-stage operation. (S280, S290)

On the other hand, if it is determined in operation 230 that the operation mode has not been changed to three stages, it is determined whether the operation mode has been changed to two stages (S310). If it is determined that the operation mode is changed to two stages, it is determined whether the accumulated operation time of the first stage operation has elapsed a predetermined time (Ts).

If the cumulative operation time of the first stage operation is less than Ts, the first compressor 11a in operation is stopped and then in standby state for a predetermined time (3 minutes). (S340, S350) After a predetermined time elapses, the second compressor ( 11b). (S360) On the other hand, if the cumulative operation time of the first stage operation is Ts or more in step 330, the first compressor 11a is immediately stopped and the second compressor 11b is started. S390, S360)

The microcomputer 30 controls the first discharge port drive unit 27a and the second discharge port drive unit 27b to close the second discharge port 26b, opens the first discharge port 26a, and changes the discharge port according to the two-stage operation. (S370) Then, the second stage operation is performed. (S380) As described above, the compressor 11, which is stopped when the operation mode is changed to the second stage or the third stage operation during the first stage operation, is waited for a time necessary to achieve the pressure balance. After maintaining the state, it operates according to the changed operation mode.                     

12A and 12B illustrate a control method when the operation mode is changed to 1st or 3rd stage of the 2nd stage operation, which is similar to the method illustrated in FIGS. 11A and 11B and will not be described below.

13 shows a control method of an air conditioner according to a second embodiment of the present invention. In the second embodiment, a pressure sensor (not shown) is provided in the first compressor 11a and the second compressor 11b instead of setting the time required for the compression equilibrium to a reference time called Ts as in the first embodiment. It is a method of starting the compressor 11 after determining whether pressure can be started by a pressure sensor. For example, when the operation mode is changed to the second stage operation during the first stage operation, the first compressor 11a is started when the first stage operation is started, and the first discharge port driver 27a is controlled to control the first discharge port ( 26a) is opened to allow the cooled air to be discharged to the first discharge port 26a. (S600, S610)

When the operation mode is changed to the second stage during the first stage operation (S620), it is determined whether the second compressor 11b is compression balanced by using the value detected by the pressure sensor installed in the second compressor 11b. If it is determined that the compression balance is not achieved, the first compressor 11a is stopped and then in a standby state for a predetermined time (3 minutes). (S640, S650) After a predetermined time has elapsed, the second compressor 11b On the other hand, if the compression of the second compressor (11b) is achieved in step 630, the start of the second compressor (11b) immediately after stopping the first compressor (11a) (S690, S660)

When the start of the second compressor 11b starts, the first discharge port drive unit 27a closes the first discharge port 26a, and the second discharge port drive unit 27b opens the second discharge port 26b to cool the air. 2 is discharged through the discharge port 26b. (S670) After controlling each drive unit in accordance with the two-stage operation as described above (S680).

As described in detail above, the present invention can control the cooling capacity of the air conditioner using the two compressors in three stages to select the appropriate operating step according to the cooling load, thereby reducing unnecessary waste of power consumption It has an effect.

In addition, it is possible to maintain a proper discharge temperature by controlling the air discharge method differently according to each operation step to perform a comfortable air conditioning.

In addition, even when the operation mode is changed, it is possible to provide the optimal indoor environment to the occupants by minimizing the probability of start failure and minimizing the waiting time through proper control.

Claims (22)

In the control method of the air conditioner that can vary the capacity of the refrigerant by using at least one compressor, According to the driving state of the compressor to control the operation in the three-stage operation mode, The three operation modes include a first operation mode in which a first compressor having a small capacity is driven, a second operation mode in which a second compressor having a large capacity is driven, and driving both the first compressor and the second compressor. 3rd operation mode, Air is discharged to the first discharge port of the air conditioner when operating in the first operation mode, and air is discharged to the second discharge port of the air conditioner when operating in the second operation mode, and to the third operation mode. Air is discharged to the first discharge port and the second discharge port during operation, If the operation mode is changed, the air conditioner control method characterized in that to maintain the standby state until the stationary compressor achieves the pressure balance, and to perform the operation in accordance with the changed operation mode. delete The method of claim 1, The first discharge port is located in the front center of the air conditioner, The second discharge port is a control method of the air conditioner, characterized in that located on the left and right sides of the air conditioner. delete The method of claim 3, The control method of the air conditioner, characterized in that the discharge area and the air volume increases toward the third operation mode of the three operation modes. delete delete delete delete delete The method of claim 3, The control method of the air conditioner, characterized in that when the change signal is input to the first operation mode during operation in the third operation mode, the second compressor is stopped and the operation of the first compressor is continued. The method of claim 3, When the change signal is input to the third operation mode during operation in the first operation mode, if the cumulative operation time of the first operation mode is less than a preset reference time, the operation of the first compressor is stopped, and the preset delay time is The control method of the air conditioner, characterized in that for driving the first compressor and the second compressor. 13. The method of claim 12, And if the cumulative operation time of the first operation mode is equal to or greater than the reference time, further driving the second compressor while continuing driving of the first compressor. The method of claim 3, During operation in the first operation mode, when the change signal is input to the second operation mode, if the cumulative operation time of the first operation mode is less than a preset reference time, the operation of the first compressor is stopped, and the preset delay time is The control method of the air conditioner, characterized in that for driving the second compressor. 15. The method of claim 14, And if the cumulative operation time of the first operation mode is equal to or greater than the reference time, stopping the operation of the first compressor and driving the second compressor. The method of claim 3, When the change signal is input to the second operation mode during operation in the first operation mode, the operation of the first compressor is stopped, and if the pressure balance of the second compressor is achieved, the second compressor is driven. Control method of air conditioner. A plurality of compressors that can vary the capacity of the refrigerant according to the load, A plurality of discharge ports, A control unit for controlling the discharge state of the plurality of discharge ports in accordance with the operation mode of the plurality of compressors, The operation mode includes a first operation mode for driving a first compressor having a smaller capacity among the plurality of compressors, a second operation mode for driving a second compressor having a larger capacity among the plurality of compressors, the first compressor, and It consists of a third operation mode for driving the second compressor, Air is discharged through the first discharge port of the plurality of discharge ports when the driving mode is operated in the first operation mode, and air is discharged through the second discharge port of the plurality of discharge ports when the driving mode is operated in the second operation mode. Air is discharged through the first discharge port and the second discharge port when operating in the mode, When the operation mode is changed, the controller maintains the standby state until the compressor which is stopped among the plurality of compressors achieves pressure balance, and then performs the operation according to the changed operation mode. . delete The method of claim 17, The first discharge port is located in the front center of the air conditioner, The second discharge port is an air conditioner, characterized in that located on the left and right sides of the air conditioner. delete The method of claim 19, The operation mode is characterized in that can be changed step by step or non-step, The non-stage change of the operation mode includes at least one of a change from the first operation mode to the third operation mode and a change from the third operation mode to the first operation mode. The method of claim 3, The operation mode of the three steps is characterized in that can be changed step by step or non-step, The non-stage change of the driving mode of the third step may include at least one of changing from the first driving mode to the third driving mode and changing from the third driving mode to the first driving mode. Control method of air conditioner.

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