KR101679576B1 - Air conditioner and controling method - Google Patents

Abstract

The present invention relates to an air conditioner and an operation method thereof, in which a frequency of a compressor is limited and controlled in response to a change of a condensation temperature and a condensation temperature, thereby preventing a load of the compressor from rising sharply, And the operation efficiency is improved.

Description

[0001] Air conditioner and control method [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner and a control method thereof, and more particularly, to an air conditioner and a control method thereof for controlling an operation frequency of a compressor in response to a temperature to prevent a sudden increase in pressure.

The air conditioner is installed to provide a comfortable indoor environment for humans by discharging cold air to the room to adjust the room temperature and purify the room air to create a pleasant indoor environment. Generally, the air conditioner includes an indoor unit which is constituted by a heat exchanger and installed in a room, and an outdoor unit which is constituted by a compressor, a heat exchanger and the like and supplies the refrigerant to the indoor unit.

Such an air conditioner is controlled separately by an indoor unit constituted by a heat exchanger, an outdoor unit constituted by a compressor, a heat exchanger and the like, and controlled by a power source supplied to a compressor or a heat exchanger. Also, at least one indoor unit may be connected to the outdoor unit, and the air conditioner is operated in the cooling or heating mode by supplying the refrigerant to the indoor unit according to the requested operation state.

When the liquid refrigerant of high temperature and high pressure is supplied from the compressor of the outdoor unit to the indoor unit through the heat exchanger of the outdoor unit during the cooling operation, the refrigerant expands and vaporizes in the heat exchanger of the indoor unit, When the temperature of the air is lowered and the indoor fan is rotated, the cool air is discharged into the room. When the gas refrigerant of high temperature and high pressure is supplied from the compressor of the outdoor unit to the indoor unit during the heating operation, the gas refrigerant of high temperature and high pressure is liquefied in the heat exchanger of the indoor unit The air warmed by the released energy is discharged to the room according to the operation of the indoor fan.

In such an air conditioner, as the load increases, the operation frequency of the compressor rises or the number of operations of the compressor increases. At this time, the compressor may be damaged in an overload state, and the compressor stops operating under overload in order to protect the compressor.

However, in the conventional compressor control system, under the condition that the load rises rapidly, there is a case where the compressor stops operating before the compressor frequency is controlled because the compressor control does not correspond to the sudden increase speed of the load. In this case, since the compressor control does not correspond to the rising speed of the load, the compressor is stopped and the compressor is stopped even if the compressor is stopped.

Accordingly, it is necessary to find a way to safely control the compressor even when the load changes rapidly.

SUMMARY OF THE INVENTION An object of the present invention is to provide an air conditioner and a control method thereof that quickly controls a compressor in response to a temperature change to quickly overload and protect a compressor.

The air conditioner according to the present invention detects a condensation temperature during operation and calculates a variation amount of the condensation temperature when the condensation temperature is higher than a reference temperature. Increasing the compressor frequency maximum value, which is the maximum value of the operating frequency that can be set in the compressor, if the change amount of the condensation temperature is below the reference value; Decreasing the compressor frequency maximum value if the change amount of the condensation temperature is greater than a reference value; And operating the compressor at an operating frequency that is set in accordance with the load within a range of the compressor frequency maximum value, wherein the case of increasing the compressor frequency maximum value and the case of decreasing the compressor frequency maximum value are distinguished , The period for increasing the compressor frequency maximum value and the period for decreasing the compressor frequency are set differently.

The control method of the air conditioner may further include: a compressor; A temperature sensing unit for sensing a condensation temperature; A control unit for changing a control setting of the compressor frequency maximum value for the compressor control corresponding to the variation amount of the condensation temperature and the condensation temperature and controlling the compressor frequency maximum value to increase or decrease at different periods in accordance with the control setting; And a compressor control unit for controlling an operation frequency of the compressor in accordance with a load so as not to exceed the compressor frequency maximum value, wherein the control unit sets a period for increasing the compressor frequency maximum value and a period for decreasing the compressor frequency differently .

According to the air conditioner and the control method of the present invention configured as described above, the compressor is controlled differently according to the operation state in response to the temperature change, thereby preventing the load of the compressor from rising sharply, So that the air conditioner can be operated stably and the operation efficiency is improved.

1 is a view illustrating a configuration of an air conditioner according to an embodiment of the present invention.
2 is a view illustrating the configuration of an outdoor unit in an air conditioner according to an embodiment of the present invention.
3 is a block diagram showing a control configuration of an outdoor unit according to an embodiment of the present invention.
4 is a flow chart referred to explain a compressor control method according to an embodiment of the present invention.
5 is a flowchart referred to for explaining an operation frequency control method according to the control setting in the control of the compressor of FIG.
6 is an exemplary diagram for explaining the operation frequency change according to temperature conversion in the air conditioner of the present invention.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

1 is a view illustrating a configuration of an air conditioner according to an embodiment of the present invention. FIG. 1 (a) is a view showing an indoor unit and an outdoor unit as an example of a stand-type air conditioner, and FIG. 1 (b) is a view showing a plurality of indoor units and an outdoor unit according to an example of the ceiling type air conditioner.

Here, the air conditioner according to the embodiment of the present invention will be described with reference to the stand type or ceiling type shown in the drawings, but it can also be used for a wall-mounted type and an integral type without any distinction between an outdoor unit and an indoor unit. . ≪ / RTI >

As shown in Fig. 1 (a), the air conditioner includes at least one indoor unit I1 and an outdoor unit O1 connected to the indoor unit. 1B, the air conditioner includes a plurality of indoor units I11 to I16 and at least one outdoor unit O11 connected to a plurality of indoor units.

Not only the plurality of indoor units and the outdoor units are connected by refrigerant piping,

The indoor units I1 to I16 and the outdoor units O1 to O11 are connected to each other through a refrigerant pipe so that the cold air is discharged from the indoor unit to the room according to the circulation of the refrigerant, Commands can be sent and received.

The air conditioner may further include a remote controller (not shown) for controlling the plurality of indoor units and the outdoor units. The air conditioner may further include a local controller (not shown) connected to the indoor unit to input a user command and output an operation state of the indoor unit. In addition to the indoor unit and the outdoor unit, the air conditioner may further include a ventilation unit, , A heater, and the like. Also, the air conditioner can be operated by interlocking the illumination unit and the alarm unit to the remote controller.

The indoor units I1 and I11 to I16 are connected to an expansion valve (not shown) for expanding the refrigerant supplied from the connected outdoor unit, an indoor heat exchanger for exchanging the refrigerant, indoor air introduced into the indoor heat exchanger, (Not shown), a plurality of sensors (not shown), and control means (not shown) for controlling the operation of the indoor unit.

The indoor units I1 and I11 to I16 include discharge ports for discharging the heat exchanged air and discharge ports are provided with airflow control means for controlling the direction of the discharged air by opening and closing the discharge port. The indoor unit controls the rotational speed of the indoor unit fan to control the air sucked and the air to be discharged, thereby regulating the air volume.

The indoor units I1 and I11 to I16 may further include an input unit for inputting setting data and a display unit for displaying the operation state and setting information of the indoor unit. The indoor unit body is connected to a local controller (not shown) in a wired or wireless manner so that the operation is set according to the data input from the local controller, and the operation state can be displayed through the local controller.

The outdoor units O1 and O11 operate in a cooling mode or a heating mode in response to a demand of an indoor unit connected thereto or an external control command, and supply the refrigerant to a plurality of indoor units.

2 is a view illustrating the configuration of an outdoor unit in an air conditioner according to an embodiment of the present invention. 2, the outdoor units O1 and O11 include a compressor 11 that receives and compresses refrigerant, an outdoor heat exchanger 15 that exchanges heat between the refrigerant and outdoor air, an outdoor fan 16, And a four-way valve 14 for selecting a flow path of the refrigerant according to the cooling / heating operation.

The outdoor units O1 and O11 include a pressure sensor for measuring the pressure of the refrigerant discharged from the compressor 11 and the pressure of the refrigerant supplied to the compressor 28 and 29 and connected to the refrigerant pipe to measure the refrigerant temperature And temperature sensors 21 to 26 which are connected in series.

And further includes a plurality of sensors, valves, oil collectors, etc., and a description thereof will be omitted in the following. At this time, the outdoor unit includes at least one compressor and may include a plurality of compressors. The performance of the outdoor unit may vary depending on the types of compressors such as inverter compressors and constant speed compressors.

The compressor (11) is connected to the accumulator (12) of the refrigerant suction portion, the pipe is connected to the discharge portion, and the oil separator (13) is installed to recover oil from the refrigerant discharged from the compressor. The accumulator 12 is connected to the refrigerant suction side of the compressor 11 and serves to prevent the unfired liquid refrigerant from flowing into the compressor 11. [

The outdoor heat exchanger (15) is connected to the four-way valve (14), and the refrigerant is condensed or evaporated by heat exchange with the outside air. During the cooling operation, or in the cooling / cooling type all-room cooling mode or the cooling mode, the outdoor heat exchanger 15 is used as a condenser, and is used as an evaporator during a heating operation or a simultaneous heating operation.

At this time, in order to facilitate the heat exchange of the outdoor heat exchanger (15), the outdoor fan (16) flows air into the outdoor heat exchanger (15). At least one outdoor fan (16) is provided corresponding to the capacity of the outdoor unit. When a plurality of outdoor unit fans are provided, a plurality of outdoor unit fans are operated corresponding to the load or the air volume required by the outdoor unit.

The outdoor fan (16) rotates at a predetermined speed in accordance with the rotation operation of the connected motor (M), so that air heat-exchanged by the outdoor heat exchanger (15) is discharged to the outside.

An outdoor electronic expansion valve (18) and a supercooling device (17) are installed on the liquid pipe connecting the outdoor heat exchanger (15) and the indoor unit (I) or the distributor. The electronic expansion valve 18 expands the condensed refrigerant during the heating operation, the heating operation or the simultaneous operation of the heating body, and the supercooling device 17 moves to the indoor unit or the distributor during the cooling operation, the cooling operation, Thereby cooling the refrigerant.

The outdoor unit configured as described above is controlled by a control configuration that supplies power to each unit and transmits control commands.

3 is a block diagram showing a control configuration of an outdoor unit according to an embodiment of the present invention.

3, the outdoor units O1 and O11 include a compressor 130, a compressor control unit 120, a temperature sensing unit 140, an output unit 160, an outdoor unit communication unit 170, a data unit 150, And a control unit 110 for controlling overall operation of the outdoor unit.

The outdoor unit includes a power supply unit (not shown) that converts power supplied from the outside into operation power, a sensing unit that senses a pressure, a motor revolution, a voltage or a current, at least one button or switch But the description thereof will be omitted in the following.

The temperature sensing unit 140 includes a plurality of temperature sensors for sensing the temperature, measures the temperature at a predetermined position, and inputs the measured temperature to the control unit 110. At this time, the temperature sensing unit 140 is provided with a plurality of temperature sensors, such as a refrigerant pipe and a heat exchanger, to measure the temperature of the refrigerant, the temperature inside and outside the outdoor unit, respectively.

The output unit 160 includes at least one output means such as a lamp, an LED, or the like, a display unit, a speaker, and the like, and outputs an operation state of the outdoor unit. In addition, the output unit 160 outputs a warning in the form of at least one of a warning warning light warning message upon occurrence of an error.

The output unit 160 outputs information about an operation set corresponding to the data input by the switch or button provided or the data input from the indoor unit through the outdoor communication unit 170, Output information.

In the data unit 150, setting data for the outdoor unit operation and control data for operation control are stored, data received from another outdoor unit or indoor unit is stored, and an operation record of the outdoor unit is stored. In addition, the data unit 150 stores reference data for determining whether the compressor is overloaded.

The compressor control unit 120 controls the operation of the compressor 130 by applying a control signal to the compressor 130 in response to the control command of the control unit 110. [ The compressor control unit 120 not only controls the start and end of the operation of the compressor 130 but also adjusts the operation frequency of the compressor 130 in response to the load.

When a plurality of compressors 130 are provided, the compressor controller 120 controls the number of compressors to be operated and controls the operation frequency of the compressors.

The compressor (11, 130) is an inverter compressor. However, at least one of a constant speed compressor and an inverter compressor may be provided, and the introduced gas refrigerant is discharged as high temperature and high pressure gas refrigerant. At this time, the operation of the compressor 130 is controlled by a predetermined switching signal applied to control the operation of the compressor motor.

The outdoor fan (16) is provided with a motor (M) for rotating operation. As the outdoor fan is rotated, rapid heat exchange in the indoor heat exchanger (51) becomes possible and the heat exchanged air is discharged outdoors.

The controller 110 processes data received from the connected indoor units or other outdoor units, and in some cases, from the remote controller, and transmits predetermined data to the outside.

The control unit 110 controls the outdoor units to perform cooling operation or heating operation in response to requests of the connected indoor units I1 and I11 to I16 or an external control command and responds to data input from the temperature sensing unit 140 or other sensors So that the outdoor unit is operated.

Particularly, the controller 110 applies a control command to the compressor controller 120 to control the operation of the compressor 130 according to the temperature value input from the temperature sensing unit 140.

The control unit 110 applies a control command to the compressor control unit 120 so that the operation frequency of the compressor 130 is changed corresponding to the sensed condensation temperature among the plurality of temperature sensors of the temperature sensing unit 140.

At this time, when the input condensation temperature is equal to or higher than the reference temperature, the control unit 110 changes the control setting for the compressor 130 in accordance with the variation amount of the condensation temperature. The compressor control unit 120 controls the operation frequency of the compressor 130 according to the changed control setting.

The controller 110 increases or decreases the compressor frequency maximum value according to a plurality of control settings, and the compressor controller 120 controls the compressor 130 according to the load in a range corresponding to the compressor frequency maximum value.

At this time, the maximum value of the compressor frequency is the maximum value of the operation frequency that can be set in controlling the operation frequency of the compressor 130, and the maximum value thereof is changed according to each control setting.

That is, as the load increases, the compressor 130 increases the operating frequency only to a maximum value that can be set, that is, a maximum value of the compressor frequency. Therefore, if the maximum value of the compressor frequency is set low, .

At this time, the controller 110 changes the compressor frequency maximum value in units different from the different time periods when the compressor frequency maximum value is increased and decreased, respectively.

At this time, the compressor 130 is operated under the control of the compressor control unit 120, but if the load suddenly increases according to the case, the compressor 130 may malfunction, and if the load of the compressor becomes a predetermined value or more, Stop operation for protection.

The control unit 110 changes the control setting according to the condensation temperature and accordingly changes the compressor frequency maximum value so as to prevent the compressor 130 from stopping due to overload.

Particularly, in a situation where the overload is continued as described above, even if the compressor is stopped and then restarted, the operation stop phenomenon may repeatedly occur. Therefore, the compressor control unit 120 controls the compressor frequency maximum value to prevent such a phenomenon.

The outdoor unit communication unit 170 includes at least one communication module and transmits / receives data to / from other controllers such as the indoor units I1, I11 to I16, or the remote controller.

The outdoor unit communication unit 170 applies the data received from the indoor unit to the control unit 110 and transmits the operation state of the outdoor unit to the indoor unit in response to the control command of the control unit 110. [ At this time, the outdoor unit communication unit 170 is provided inside the outdoor unit, but may be provided separately on the outside in some cases.

4 is a flow chart referred to explain a compressor control method according to an embodiment of the present invention.

As shown in FIG. 4, during operation of the air conditioner (S310), the controller 110 determines whether the compressor is operating (S320).

When the compressor is in operation, the controller 110 controls the sensor for sensing the condensation temperature among the plurality of sensors of the temperature sensing unit 140 so that the condensation temperature is measured (S330).

The controller 110 compares the input condensation temperature with a reference temperature (S340). When the condensation temperature is equal to or higher than the reference temperature, the controller 110 calculates a change amount of the condensation temperature (S350). At this time, the controller 110 calculates a change amount of the condensation temperature measured at predetermined time intervals.

The control unit 110 compares the variation amount of the condensation temperature with the reference value (S360). If the variation amount is less than the reference value, the controller 110 controls the compressor frequency maximum value to increase (S370). At this time, the control setting for the compressor frequency maximum value is set to zone 1.

If it is larger than the reference value of the variation amount of the condensation temperature, the controller 110 controls the compressor frequency maximum value to be decreased (S380). At this time, the control setting for the compressor frequency maximum value is set to zone 2.

On the other hand, when the condensation temperature is lower than the reference temperature, the controller 110 performs a general control on the compressor frequency maximum value (S390). At this time, there is no limitation on the maximum value of the compressor frequency in the general control. That is, it is possible to control the compressor without limiting the maximum value. The control setting for the compressor frequency maximum value is set to zone 0.

If the compressor does not operate, it is unnecessary to control the maximum frequency of the compressor.

The control unit 110 performs control on the compressor frequency maximum value as described above except for the case where the end command is input (S400) and the operation is stopped (S410). The compressor control unit 120 controls the operation frequency of the compressor 130 within the compressor frequency maximum value in accordance with the control command of the controller 110. [

The control unit 110 measures the condensation temperature at a predetermined cycle even if the compressor frequency maximum value control setting is determined and changes the control setting for the compressor frequency maximum value according to the change amount so that the maximum value of the compressor frequency increases or decreases.

In this case, when the control setting for the compressor frequency maximum value is set to one of zone 0, zone 1, and zone 2, the compressor control method according to this is as follows.

5 is a flowchart referred to for explaining an operation frequency control method according to the control setting in the control of the compressor of FIG.

5, when the control setting for the compressor frequency maximum value is set to one of zone 0, zone 1, and zone 2 during operation (S450), the compressor control unit 120 controls the control unit 110 And controls the compressor 130 within the control setting for the compressor frequency maximum value in accordance with the control command of the compressor 130. [

The control unit 110 determines whether the control setting for the compressor frequency maximum value is set to zone 2 (S470) or zone 1 (S480).

At this time, if the control is not set to the zones 1 and 2, that is, if the control for the compressor frequency maximum value is not set or if the zone 0 is set, the controller 110 performs the general control for the compressor frequency maximum value at step S490.

At this time, the compressor control unit 120 controls the operation frequency of the compressor so that the compressor operates without any restriction on the compressor frequency maximum value (S500).

On the other hand, if the control setting for the compressor frequency maximum value is set to zone 1, the controller 110 increments the compressor frequency maximum value by A level (S510). For example, the controller 110 increases the compressor frequency maximum value by one.

The compressor control unit 120 controls the operation frequency of the compressor according to the load within the compressor frequency maximum value based on the compressor frequency maximum value set by the controller 110 in operation S520.

When the first time has elapsed after controlling the compressor within the set maximum compressor frequency range (S530), the control unit 110 changes the control setting for the compressor frequency maximum value according to the variation amount of the condensation temperature as shown in FIG. 4 (S470 to S480, S510 to S530).

At this time, when the zone 1 is maintained without changing the zone, the controller 110 increases the compressor frequency maximum value by A level and controls the compressor for the first time according to the changed compressor frequency maximum value (S510 to S530). The compressor control unit 120 controls the compressor 130 for a first time according to the load so as not to exceed the changed compressor frequency maximum value.

If the control setting for the compressor frequency maximum value is set to zone 2, the controller 110 decreases the compressor frequency maximum value by B level (S540). For example, the controller 110 decreases the compressor frequency maximum value by five.

The compressor control unit 120 controls the operation frequency of the compressor according to the load based on the compressor frequency maximum value set by the controller 110 (S550). The control unit 110 applies a control command to the compressor control unit 120 according to the change of the compressor frequency maximum value and the compressor control unit 120 controls the operation frequency of the compressor 130 accordingly.

At this time, the controller 110 changes the control setting (zone) for the compressor frequency maximum value according to the change amount of the condensation temperature for a second time (S560) at the set compressor frequency maximum value, The compressor control unit 120 controls the operation frequency of the compressor 130 for a second time within the changed range by reducing the compressor frequency maximum value by B in steps S540 to S560.

At this time, the control unit 110 increases or decreases the compressor frequency maximum value which is the maximum value of the operation frequency independently of the operation frequency, not the operation frequency of the compressor. When the compressor frequency maximum value is increased or decreased by the control unit 110, the compressor control unit 120 increases or decreases the operation frequency of the compressor 130 according to the load within the set maximum compressor frequency range.

Here, A and B are different values and values that can be varied according to the setting. It is also preferable that A is set to be smaller than B.

Also, the first time and the second time are set differently from each other in the frequency change period in zone 1 and zone 2, which can be changed according to the setting. That is, the cycle of changing the compressor frequency maximum value in zones 1 and 2 is different. In this case, the first time is preferably set to a time unit larger than the second time.

Also, if the compressor frequency maximum value is changed, it is operated within the compressor frequency maximum value range for the minimum first time in case of zone 1, and within the compressor frequency maximum value range set for the minimum second time in case of zone 2 .

Changes the control setting for the compressor frequency maximum value, that is, the zone, or increases or decreases the compressor frequency maximum value when the zone is not changed, respectively, according to the condensation temperature at the first time or the second time elapse. That is, when the zone is not changed, the compressor frequency maximum value is changed in the first time period in Zone 1 and in the second time period in Zone 2 case.

If the frequency of the compressor is equal to or greater than the preset maximum value while the compressor frequency maximum value is changed in the first time period or the second time period corresponding to the control setting according to the compressor frequency maximum value and the condensation temperature reaches the cutoff value (S570) , The compressor is restarted after the compressor is stopped (S570).

6 is an exemplary diagram for explaining the operation frequency change according to temperature conversion in the air conditioner of the present invention.

As described above, by increasing or decreasing the compressor frequency maximum value at different cycles in accordance with the change of the condensation temperature, the operation frequency of the compressor can be effectively controlled.

Referring to FIG. 6, when the condensation temperature changes, the operation frequency of the compressor also changes. By controlling the operation frequency of the compressor through the maximum value control as in the present invention, Can be controlled.

Particularly, when the condensation temperature is abruptly changed as in the first zone Z and the frequency is limited to the first frequency, the frequency of the compressor is also set within the first frequency range as the second operation frequency.

Accordingly, the operation frequency of the compressor is not rapidly increased beyond a predetermined value, and the compressor can be prevented from being overloaded.

Therefore, by setting the maximum value of the compressor frequency and controlling the operation frequency of the compressor within the range, it is possible to restrict the operation frequency of the compressor from exceeding a specific value. In addition, by making the cycle for increasing and decreasing the compressor frequency maximum value different, it becomes possible to cope with the load fluctuation quickly.

In addition, the overload of the compressor can be prevented, and the operation frequency of the compressor can be instantly limited according to the change of the condensing temperature, so that the frequency control of the compressor can be easily performed, and the damage of the compressor can be prevented.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, .

110: control unit 120: compressor control unit
130: compressor 140: temperature sensing unit
150: drive control unit 160: output unit
170: outdoor communication unit
I1, I11 to 16, 200: indoor unit O1, O11: outdoor unit

Claims (9)

Detecting a condensation temperature during operation and calculating a change amount of the condensation temperature when the condensation temperature is equal to or higher than a reference temperature;
If the amount of change in the condensation temperature is below the reference value,
Increasing the compressor frequency maximum value, which is the maximum value of the operating frequency that can be set in the compressor;
Decreasing the compressor frequency maximum value if the change amount of the condensation temperature is greater than a reference value; And
And operating the compressor at an operating frequency set in accordance with the load within a range of the changed compressor frequency maximum value,
Wherein the compressor frequency maximum value is increased and the compressor frequency maximum value is decreased. The compressor frequency maximum value and the compressor frequency maximum value are alternately increased and decreased, How it works. The method according to claim 1,
Increasing the compressor frequency maximum value in a period of a first time when the compressor frequency maximum value is increased,
Wherein when the compressor frequency maximum value is decreased, the compressor frequency maximum value is decreased in a period of a second time shorter than the first time. The method according to claim 1,
Increasing the compressor frequency maximum value by a first unit when the compressor frequency maximum value is increased,
Wherein the compressor frequency maximum value is decreased by a second unit larger than the first unit when the compressor frequency maximum value is decreased. The method according to claim 1,
Further comprising: controlling the compressor without limiting the compressor frequency maximum value in the case of either the condensation temperature being less than the reference temperature or the compressor not operating. The method according to claim 1,
Further comprising the step of stopping the compressor when the condensation temperature reaches a cutoff value. compressor;
A temperature sensing unit for sensing a condensation temperature;
A controller for changing a control setting of a compressor frequency maximum value for controlling the compressor corresponding to the variation amount of the condensation temperature and the condensation temperature and controlling the compressor frequency maximum value to increase or decrease at different periods in accordance with the control setting, ; And
And a compressor control unit for controlling an operation frequency of the compressor according to a load so as not to exceed the compressor frequency maximum value,
Wherein the control unit sets the period for increasing the compressor frequency maximum value and the period for decreasing the compressor frequency differently. The method according to claim 6,
Wherein the controller calculates a variation amount of the condensation temperature when the condensation temperature is equal to or higher than a reference temperature and changes a control setting for the compressor frequency maximum value so that the compressor frequency maximum value increases or decreases according to the variation amount of the condensation temperature The air conditioner comprising: The method according to claim 6,
The control unit sets the control setting for the compressor frequency maximum value to the zone 1 to increase the compressor frequency maximum value when the amount of change in the condensation temperature is less than the reference value and if the condensation temperature change amount is larger than the reference value, And the control value for the compressor is set to the zone 2 so that the compressor frequency maximum value is decreased. The method according to claim 6,
The control unit
And when the compressor frequency maximum value increases and decreases, the compressor frequency is changed to a different time period and a different size, respectively.

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