KR101003501B1 - A compressor control method of multi air-conditioner - Google Patents

Abstract

The present invention relates to a compressor control method of a multi-type air conditioner that can increase the lifespan and secure reliability by preventing oil concentration or shortage of some of the variable displacement compressor and the constant speed compressor. A first step of integrating time; A second step of comparing the integration time and the first set time of the variable capacity compressor or the constant speed compressor integrated in the first step; A third step of judging that the operation time of the variable displacement compressor or the constant speed compressor is equal to or greater than the first predetermined time as a result of the second step; A fourth step of driving the variable-capacity compressor to the first set capacity and turning off the constant speed compressor for a second set time when it is determined in the third step that the fuel oil operation is performed; A fifth step of driving the variable capacity compressor at a second set capacity and turning on the constant speed compressor for a third set time after the fourth step so that the oil is evenly distributed between the variable capacity compressor and the constant speed compressor. do.

Air Conditioner, Indoor Unit, Outdoor Unit, Variable Variable Compressor, Constant Speed Compressor, Control Unit

Description

A compressor control method of multi air conditioner             

1 is a main part configuration diagram showing the flow of the refrigerant when the indoor unit of the multi-type air conditioner according to the prior art is operated as a cooler,

2 is a main part configuration diagram showing the flow of the refrigerant when the indoor unit of the multi-type air conditioner according to the prior art is operated as a heater,

3 is a partially cutaway perspective view of an embodiment of a multi-type air conditioner according to the present invention;

4 is a block diagram showing a main part of an outdoor unit of an embodiment of a multi-type air conditioner according to the present invention;

5 is a main part configuration diagram showing a plurality of indoor units of an embodiment of a multi-type air conditioner according to the present invention;

6 is a control block diagram of an embodiment of a multi-type air conditioner according to the present invention;

7 is a flow chart showing an embodiment of a compressor control method of an embodiment of a multi-type air conditioner according to the present invention;

8 is a partially cutaway perspective view of another embodiment of a multi-type air conditioner according to the present invention;

9 is a control block diagram of another embodiment of a multi-type air conditioner according to the present invention;                 

10 is a flowchart illustrating a compressor control method of another embodiment of a multi-type air conditioner according to the present invention.

<Explanation of symbols on main parts of the drawings>

50: outdoor unit 52: outdoor heat exchanger

54 capacity variable compressor 56 constant speed compressor

57: outdoor blower 72: flow path switching valve

79: control unit 100,110,120: indoor unit

104,114,124: Indoor heat exchanger 106,116,126: Electronic expansion valve

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-type air conditioner, and more particularly, to a compressor control method of a multi-type air conditioner to distribute oil evenly among a plurality of compressors.

In general, a multi-type air conditioner connects a plurality of indoor units to one outdoor unit, and each of the plurality of indoor units is used as a cooler or a heater while using the outdoor unit in common.

1 is a block diagram showing the flow of refrigerant when the indoor unit of the multi-type air conditioner according to the prior art is operated as a cooler, and FIG. 2 is a refrigerant when the indoor unit of the multi-type air conditioner according to the prior art is operated as a heater. The main part configuration diagram showing the flow of.                         

As shown in Fig. 1 and Fig. 2, the multi-type air conditioner is a compressor 11 for changing the low-temperature low-pressure gaseous refrigerant to high temperature and high pressure, and condensing the high-temperature high-pressure gas refrigerant with liquid refrigerant while dissipating heat to the surroundings. Condensation means (outdoor heat exchanger 13 for cooling, indoor heat exchangers 21, 22, 23, and 24 for heating), and a liquid refrigerant condensed by the condensation means at a low temperature and low pressure in which gas and liquid are mixed. Expansion valves 14, 15, 16 and 17 for expanding with phase refrigerant and evaporation means for absorbing the surrounding heat to evaporate the two phase refrigerant in a gaseous state (indoor heat exchangers 21, 22, 23 and 24 during cooling). , An outdoor fan (not shown) and a motor (not shown) installed in the vicinity of the outdoor heat exchanger 13 and the outdoor heat exchanger 13 to blow air to the outdoor heat exchanger 13 to increase heat exchange efficiency. And through the indoor air to the indoor heat exchanger (21,22,23,24) Indoor fans 27, 28, 29, 30 and motors 31, 32, 33, 34 for discharging the cooled air into the room, and the compressor 11, outdoor motors, and indoor motors 31, 32, 33, 34, and a control unit (not shown) for controlling the expansion valves (14, 15, 16, 17), the compressor (11), condensing means, expansion valves (14, 15, 16, 17), evaporation Means are connected to the refrigerant pipe (9).

Reference numeral 12 is a four-way valve 12 that sends the high-temperature, high-pressure gas refrigerant from the compressor 11 to the outdoor heat exchanger 13 when cooling, and to the indoor heat exchangers 21, 22, 23, and 24 when heating. And a flow of refrigerant circulated by the control unit to circulate the compressor 11, the outdoor heat exchanger 13, the expansion valves 14, 15, 16, 17, and the indoor heat exchanger 21, 22, 23, 24. By switching to each of the indoor units (1, 2, 3, 4) can be used as a heater or cooler.

In addition, reference numeral 19 denotes a cause of failure of the compressor 11 when liquid refrigerant that has not been evaporated from the indoor heat exchanger 21, 22, 23, 24 enters the compressor 1. In order to prevent this, the accumulator is a liquid refrigerant is stored.

Meanwhile, the indoor heat exchangers 21, 22, 23, and 24, the indoor fans 27, 28, 29, 30, and the motors 31, 32, 33, and 34 are provided with a plurality of indoor units 1, 2, 3, and 4. ), The outdoor heat exchanger (13), the compressor (11), the four-way valve (12), the outdoor fan and the motor are installed in the outdoor unit (5), and the expansion valves (14, 15, 16, 17). ) Are installed in each of the indoor units (1, 2, 3, 4) or are installed in the outdoor unit as shown in Figs.

In the conventional multi-type air conditioner configured as described above, when all of the indoor units 1, 2, 3, and 4 are cooled and driven, as shown in FIG. 1, the high-temperature and high-pressure refrigerant from the compressor 11 is outdoors. The refrigerant, which is sent to the heat exchanger 13 and passes through the outdoor heat exchanger 13, is condensed into the liquid refrigerant in a gaseous state of high temperature and high pressure by heat exchange with ambient air, and then the expansion valves 14, 15, 16, Is sent to 17). The refrigerant is expanded into the low-temperature, low-pressure two-phase refrigerant passing through the expansion valves (14, 15, 16, 17) and then flows into the indoor heat exchangers (21, 22, 23, 24), the indoor heat exchanger By absorbing the surrounding heat while evaporating in a gaseous state while passing through (21, 22, 23, 24), each of the plurality of indoor units (1, 2, 3, 4) performs a function as a cooler.

And, when all of the indoor unit (1, 2, 3, 4) is heated and driven, as shown in Figure 2, the high-temperature, high-pressure refrigerant from the compressor 11 is an indoor heat exchanger (21, 22, 23) , 24). The indoor heat exchangers 21, 22, 23, and 24 radiate heat of the refrigerant to the surroundings while the high temperature and high pressure gas refrigerant condenses into the liquid refrigerant, and thus each of the indoor units 1, 2, 3, and 4 performs a function as a heater. Do it. Then, the refrigerant passing through the indoor heat exchanger (21, 22, 23, 24) is expanded to low temperature, low pressure passing through the electromagnetic expansion valve (14, 15, 16, 17) to the outdoor heat exchanger (13) The refrigerant flowing in and passing through the outdoor heat exchanger 13 is evaporated to a gas state by heat exchange with ambient air, and then circulates through the refrigeration cycle.

On the other hand, the multi-type air conditioner, as shown in Figures 1 and 2, when a plurality of the compressor 11 is mounted, some of the plurality of compressors, the capacity of the compressor 11, the power consumption of driving the compressor 11 It is possible to quickly eliminate the load of the plurality of indoor units (1, 2, 3, 4) while minimizing.

That is, the capacity variable compressor 11a having variable capacity and the constant speed compressor 11b driven at constant speed are installed inside the outdoor unit 5, and the capacity is variable when the load of the indoor units 1, 2, 3, 4 is small. Only the compressor 11a is driven to the load, and when the load of the indoor units 1, 2, 3, and 4 is large, the variable capacity compressor 11a is driven and the constant speed compressor 11b is controlled to be turned on, thereby changing the capacity. The power consumption of the compressor 11a and the constant speed compressor 11b can be reduced as well as the life can be increased.

On the other hand, each of the variable displacement compressor (11a) and the constant speed compressor (11b) has a compression unit having a compression chamber for compressing the refrigerant, a motor unit for varying the compression chamber, and oil for lubricating the motor unit or the compression unit The compressor (11a, 11b) is configured to include a pump for pumping, the internal oil is discharged with the refrigerant when discharging the gas refrigerant of high temperature and high pressure, the discharged oil circulates the refrigeration cycle with the refrigerant After that, the oil is reflowed into the compressors 11a and 11b.

However, in the compressor control method of the multi-type air conditioner according to the related art, when only the variable capacity compressor 11a is driven for a predetermined time (for example, 6 hours) or more, the refrigerant is concentrated in the variable capacity compressor 11a. When the constant speed compressor 11b is driven for more than a predetermined time (for example, 6 hours), the refrigerant may be concentrated in the constant speed compressor 11b, so that the oil is excessive or insufficient in the variable capacity compressor 11a or the constant speed compressor 11b. This occurs, wear and noise of the compressor (11a, 11b) is insufficient, there is a problem that the life can be shortened.

The present invention has been made to solve the above-mentioned problems of the prior art, the compressor control of a multi-type air conditioner that can increase the life and ensure reliability by preventing oil concentration or shortage of some of the variable capacity compressor and constant speed compressor The purpose is to provide a method.

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Compressor control method of a multi-type air conditioner according to the present invention for solving the above problems is to adjust the on / off and capacity of the variable displacement compressor according to the on / off of the plurality of indoor units and to turn on / off of the plurality of constant speed compressor A compressor control method of an air conditioner for controlling, comprising: a first step of integrating operation times of a plurality of constant speed compressors; A second step of comparing an integration time and a first set time of the plurality of constant speed compressors integrated in the first step; A third step of judging as a lubricating oil operation if it is determined that the integration time of the constant speed compressor is equal to or greater than the first set time as a result of the second step; A fourth step of driving the variable-capacity compressor to the first predetermined capacity and turning off all of the plurality of constant speed compressors for a second predetermined time, when it is determined that the fuel oil operation is performed in the third step; A fifth step of, after the fourth step, driving the variable capacity compressor to the second predetermined capacity for a third set time, turning on some of the plurality of constant speed compressors, and turning off the remainder of the plurality of constant speed compressors; A sixth step of driving the variable-capacity compressor to a third set capacity for a fourth set time after the fifth step, turning off the compressor turned on in the fifth step and turning on the compressor turned off in the fifth step; ; A seventh step of driving the variable capacity compressor to the fourth predetermined capacity for the fifth set time after the sixth step, turning on the compressor turned off in the sixth step, and turning off the compressor turned on in the sixth step; It includes.

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

Figure 3 is a perspective view of an embodiment of a multi-type air conditioner according to the present invention, Figure 4 is a block diagram showing the main part of the outdoor unit of an embodiment of a multi-type air conditioner according to the present invention.

As shown in FIGS. 3 to 4, the outdoor unit 50 is equipped with an outdoor heat exchanger 52 and an outdoor blower 53, and each of the variable displacement compressor 54 and the constant speed compressor 56 is provided. .

The outdoor heat exchanger 52 may have one refrigerant passage or may be divided such that a plurality of refrigerant passages are connected in parallel.

The plurality of compressors 54 and 56 may include a variable capacity compressor 54 having a variable capacity and a constant speed compressor 56 that is driven at a constant speed, and the variable capacity compressor 54 corresponds to the number and load of the plurality of indoor units. And the constant speed compressor 56 are driven.                     

That is, when the load of the plurality of compressors 54 and 56 is small (for example, only a part 100 of the plurality of indoor units 100, 110 and 120 is operated), the indoor unit 100 in which only the variable displacement compressor 52 is operated is operated. When the load is large (for example, all of the indoor units 100, 110, and 120 are driven), the variable capacity compressor 52 is driven and the constant speed compressor 54 is turned on.

In addition, the compressors 54 and 56 include a compression unit having a compression chamber in which a refrigerant is compressed, a motor unit compressing the compression chamber, and an oil pump for pumping oil for lubrication of the motor unit or the compression unit. When the refrigerant is discharged, the internal oil is partially discharged together with the refrigerant.

Meanwhile, the outdoor unit 50 includes oil separators 58 and 61 connected to the refrigerant discharge pipes 54a and 56a of the compressors 54 and 56 to separate oil discharged together with the refrigerant from the refrigerant. Oil return pipes 59 and 62 connected to the refrigerant suction pipes 54b and 56b of the compressors 54 and 56 to return the oil separated from the oil separators 58 and 60 to the compressors 54 and 56; And check valves 60 and 63 mounted on the refrigerant discharge pipes 54a and 56a of the compressors 54 and 56, respectively, to prevent backflow of refrigerant or oil. The oil discharged together with the refrigerant from the oil is mostly separated from the oil separators 58 and 60 and circulated to the refrigerant suction pipes 54b and 84b of the compressors 54 and 56, but a part of the oil is discharged together with the refrigerant. It will cycle.

Reference numeral 70 is mounted in the outdoor unit 50 and is connected to the refrigerant intake pipes 54b and 56b of the variable displacement compressor 54 and the constant speed compressor 56 so that the variable displacement compressor 54 and the constant speed compressor 56 are not included. It is a common accumulator that accumulates liquid refrigerant so that only gaseous refrigerant can flow into each.

Reference numeral 72 denotes one side of the indoor heat exchanger and the outdoor heat exchanger 52 in which the refrigerant having passed through the oil separators 58 and 60 is mounted in the outdoor unit 50 to use the plurality of indoor units as a cooler or a heater. Four-way valve to switch the flow path to flow into.

Reference numeral 74 is a receiver mounted in the outdoor unit 50 to store excess refrigerant and to circulate only the liquid refrigerant to the indoor unit during the cooling operation.

Reference numeral 76 denotes an expansion device for expanding the refrigerant passing through the outdoor heat exchanger 52 and sending it to the indoor heat exchanger during heating, which is mounted on the refrigerant pipe connecting the outdoor heat exchanger 52 and the receiver 74. A bypass valve 76a through which the refrigerant blocked by the check valve 76a is bypassed, and an electromagnetic expansion valve 76c through which the refrigerant bypassed by the bypass pipe 76b is expanded; LEV).

Reference numeral 78 denotes a strainer mounted on the refrigerant pipe to filter foreign matter mixed in the refrigerant or oil.

Reference numeral 79 is a control unit for controlling the variable capacity compressor 52, the constant speed compressor 54, the outdoor blower 58, and the like in response to the load of the plurality of indoor units 100, 110, 120.

5 is a block diagram showing the main parts of a plurality of indoor units of an embodiment of a multi-type air conditioner according to the present invention.                     

As illustrated in FIG. 5, each of the indoor units 100, 110 and 120 includes indoor blowers 102, 112 and 122 that suck indoor air into the indoor units 100, 110 and 120, and discharge the air back into the room. And an indoor heat exchanger (104, 114, 124) for cooling or heating to heat exchange with the refrigerant, and an electromagnetic expansion valve (106, 116, 126: LEV) for expanding the refrigerant.

Then, the refrigerant passing through each of the indoor units (100, 110, 120) is combined in the lamination pipe 132 and introduced into the outdoor unit, and the refrigerant passing through the outdoor unit is distributed to the branch pipes (134, 136, 138) and introduced into each of the indoor units (100, 110, 120). do.

Figure 6 is a control block diagram of an embodiment of a multi-type air conditioner according to the present invention, Figure 7 is a flow chart showing an embodiment of a compressor control method of an embodiment of a multi-type air conditioner according to the present invention.

First, when a driving operation is performed on the driving operation unit 101 of the indoor units 100, 110, 120, the controller 79 drives the variable capacity compressor 52 or the constant speed compressor 54 in response to the total load of the indoor units 100, 110, 120. In addition, the operation time of the variable displacement compressor 52 or the constant speed compressor 54 is integrated.

The control unit 79 compares the integrated operation integration time as described above with a first set time (for example, six hours). (S2)

Here, the controller 79 may add the operation time of only one of the variable capacity compressor 52 and the constant speed compressor 54 and compare it with the first set time, and the variable capacity compressor 52 and the constant speed compressor may be used. It is also possible to accumulate the operation time when all of the 54 are in operation and compare with the first set time.

On the other hand, the controller 79 determines that the operation integration time of the variable displacement compressor 52 or the constant speed compressor 54 is greater than or equal to the first predetermined time, and the operation mode of the variable displacement compressor 52 and the constant speed compressor 54 is determined. It is judged that the operation is equal.

The controller 79 drives the variable displacement compressor 52 to the first predetermined capacity (for example, 60 kPa) for a second predetermined time (for example, 2 minutes) and the constant speed compressor 54. (S3)

At this time, the oil discharged with the refrigerant in the variable displacement compressor 52 is circulated with the oil remaining in the refrigeration cycle is concentrated to the variable displacement compressor (52) side.

Then, after the single drive of the variable displacement compressor 52 as described above, the control unit 79 operates the variable displacement compressor 52 for the second predetermined capacity (for example, two minutes) for the third predetermined time (for example, two minutes). For example, it drives to 30 kV) and turns on the constant speed compressor 54. (S4)

Here, the second set capacity is set smaller than the first set capacity so that oil concentrated in the variable capacity compressor 52 can be partially distributed to the constant speed compressor 54.

At this time, the oil concentrated in the variable-capacity compressor 52 is discharged together with the refrigerant and then circulated with the oil remaining in the refrigeration cycle, and the circulated oil is introduced into the constant speed compressor 54. Then, the rest is introduced into the variable displacement compressor 52, so that the oil is uniformly dispersed in the variable displacement compressor 52 and the constant speed compressor 54.

8 is a perspective view of another embodiment of a multi-type air conditioner according to the present invention;

As shown in FIG. 8, the outdoor unit 50 is provided with one variable-capacity compressor 52 and the first and second constant speed compressors 154 and 156 so that a larger number of indoor units 100, 110 and 120 can be connected as well. It can respond more quickly to the load of (100, 110, 120).

Other configurations except for the first and second constant speed compressors 154 and 156 are the same as in the exemplary embodiment of the present invention, and thus detailed description thereof will be omitted.

9 is a control block diagram of another embodiment of a multi-type air conditioner according to the present invention, and FIG. 10 is a flowchart illustrating a compressor control method of another embodiment of the multi-type air conditioner according to the present invention.

First, the controller 79 integrates the operating time of the first and second constant speed compressors 154 and 156. (S11)

Then, the controller 79 compares the integration time of the first and second constant speed compressors 154 and 156 with the first set time (for example, one hour) (S12).

Herein, the control unit 92 may integrate and compare operation times of only one of the first and second constant speed compressors 154 and 156, and operate when all of the first and second constant speed compressors 154 and 156 are driven. It is also possible to integrate the time and compare.

On the other hand, if it is determined that the integration time of the first and second constant speed compressors 154 and 156 is greater than or equal to the first set time, the control unit 79 switches the operation modes of the variable displacement compressor 52 and the first and second constant speed compressors 154 and 156. Judging by running oil.

The controller 79 drives the variable displacement compressor 52 at a first set capacity (for example, 60 kPa) for a second set time (for example, 2 minutes) and the first and second constant speeds. The compressors 154 and 156 are turned off. (S13)

At this time, the oil discharged together with the refrigerant in the variable displacement compressor 52 is circulated with the oil remaining in the refrigeration cycle is concentrated on the variable displacement compressor (52) side.

Then, the controller 79 operates the displacement variable compressor 52 for the third predetermined time (for example, one minute) after the single drive of the variable displacement compressor 52 as described above. For example, it drives at 30 kW, turns on the first constant speed compressor 154 and turns off the second compressor 156 among the plurality of constant speed compressors 154 and 156. (S14)

At this time, the oil discharged with the refrigerant in the variable-capacity compressor 52 and the oil discharged with the refrigerant in the first constant speed compressor 154 is circulated with the oil remaining in the refrigeration cycle, the circulated oil is partially Is introduced into the first constant speed compressor 154, and the remainder is introduced into the variable displacement compressor 52, so that the oil concentrated in the variable displacement compressor 52 is transferred to the first constant speed compressor 154. Will be distributed.                     

Meanwhile, the controller 79 may operate the variable displacement compressor 52 for a fourth preset time (for example, one minute) after the above-described variable displacement compressor 52 and the first constant speed compressor 154 are driven. In addition to driving at a third set capacity (for example, 30 kV), the first compressor 154 is turned off and the second constant speed compressor 156 is turned on among the plurality of constant speed compressors 154 and 156. (S15)

At this time, the oil discharged with the refrigerant in the variable-size compressor 52 and the oil discharged with the refrigerant in the second constant speed compressor 156 is circulated with the oil remaining in the refrigeration cycle, the circulated oil is partially Is introduced into the second constant speed compressor 156, and the remainder is introduced into the variable displacement compressor 52, so that the oil concentrated in the variable displacement compressor 52 is transferred to the second constant speed compressor 156. Will be distributed.

Meanwhile, the controller 79 controls the variable displacement compressor 52 for a fifth set time (for example, 2 minutes) after the above-described variable displacement compressor 52 and the second constant speed compressor 156 are driven. Is driven to the fourth set capacity (for example, 60 kPa), the first constant speed compressor 154 is turned on again among the plurality of constant speed compressors, and the second constant speed compressor 156 is turned off again (S16).

In this case, the oil discharged with the refrigerant in the variable-capacity compressor 72 and the oil discharged with the refrigerant in the first constant speed compressor 154 are circulated with the oil remaining in the refrigerating cycle, and the circulated oil is partially Is introduced into the first constant speed compressor 154, and the rest is introduced into the variable displacement compressor 52, so that the refrigerant is uniformly dispersed in the variable displacement compressor 52 and the first constant speed compressor 154. .                     

Meanwhile, the first set capacity and the fourth set capacity are the same, the second set capacity and the third set capacity are the same, and are set lower than the first set capacity and the fourth set capacity, and the second set time. And the fifth set time are the same, and the third set time and the fourth set time are the same, and are set shorter than the second set time and the fifth set time, so that the amount of oil sufficient for the variable displacement compressor 52 The oil is collected and distributed to the first and second constant speed compressors 74 and 76, and then a sufficient amount of oil can be collected into the variable displacement compressor 52.

On the other hand, the present invention is not limited to the above embodiments and drawings, as well as the case where a plurality of outdoor units 50 are mounted, as well as four or more indoor units (100, 110, 120) is connected to the outdoor unit 50 is of course applicable. .

In the compressor control method of the multi-type air conditioner according to the present invention configured as described above, when the operation integration time of the variable capacity compressor or the constant speed compressor is equal to or greater than the first set time, the first variable set compressor is set for the second set time. Drive the displacement, turn off the constant speed compressor to concentrate the oil in the variable displacement compressor, and then drive the variable displacement compressor to the second predetermined displacement for a third set time and turn on the constant speed compressor to turn on the variable displacement compressor. Since the oil concentrated in the air can be dispersed into the variable displacement compressor and the constant speed compressor, oil excess / lack of either the variable displacement compressor or the constant speed compressor can be prevented, and noise and abrasion that may occur when the oil is insufficient And shorten the service life and reduce the compressor's deterioration There is an advantage that can be prevented.

In addition, the second set capacity is set lower than the first set capacity, there is an advantage that the oil concentrated in the variable capacity compressor can be evenly distributed between the variable capacity compressor and the constant speed compressor.

Claims (5)

delete delete In the compressor control method of the air conditioner to adjust the on / off and capacity of the variable displacement compressor according to the on / off of the plurality of indoor units and to control the on / off of the plurality of constant speed compressor, A first step of integrating operation times of the plurality of constant speed compressors; A second step of comparing an integration time and a first set time of the plurality of constant speed compressors integrated in the first step; A third step of judging as a lubricating oil operation if it is determined that the integration time of the constant speed compressor is equal to or greater than the first set time as a result of the second step; A fourth step of driving the variable-capacity compressor to the first predetermined capacity and turning off all of the plurality of constant speed compressors for a second predetermined time, when it is determined that the fuel oil operation is performed in the third step; A fifth step of, after the fourth step, driving the variable capacity compressor to the second predetermined capacity for a third set time, turning on some of the plurality of constant speed compressors, and turning off the remainder of the plurality of constant speed compressors; A sixth step of driving the variable-capacity compressor to a third set capacity for a fourth set time after the fifth step, turning off the compressor turned on in the fifth step and turning on the compressor turned off in the fifth step; ; A seventh step of driving the variable capacity compressor to the fourth predetermined capacity for the fifth set time after the sixth step, turning on the compressor turned off in the sixth step, and turning off the compressor turned on in the sixth step; Compressor control method of a multi-type air conditioner comprising a. The method of claim 3, wherein The first set capacity and the fourth set capacity are the same, And the second set capacity and the third set capacity are the same and lower than the first set capacity and the fourth set capacity. The method of claim 3, wherein The second set time and the fifth set time are the same, And the third set time and the fourth set time are the same and are shorter than the second set time and the fifth set time.

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