JPH11281130A - Air conditioner and method controlling compressor operating capacity thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress an excessive operating capacity of a compressor so as to save energy by lowering the operating capacity of the compressor when it reaches a specified state. SOLUTION: A compressor 16 is operated with a specified spare capacity (frequency of current fed to the compressor 16 is 30 Hz) or more. In this case, when the temperature of a refrigerant flowing through an outdoor heat exchanger 21 during cooling operation is a second low temperature set value (6 deg.C) or less which is higher than a first low temperature set value (2 deg.C), and the refrigerant temperature during heating operation is a second high temperature set value (52 deg.C) or more which is lower than a first high temperature set value (56 deg.C), operating capacity of the compressor 16 is lowered. As a result, unpleasant feeling of cold air generated by excessive operation of the compressor 16, dew condensation in the indoor heat exchanger 21, or inappropriateness and the like of the discharged air temperature of excessive heating and the like in an indoor upper part space due to a rise in the discharged air temperature are prevented, and energy can be saved by suppressing the operating capacity of the compressor 16.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for controlling a compressor operating capacity of an air conditioner, and an air conditioner used for implementing the method.

[0002]

2. Description of the Related Art An air conditioner has an outdoor unit equipped with an outdoor heat exchanger and a compressor whose capacity can be controlled, and an indoor unit equipped with an indoor heat exchanger, and controls the operating capacity of the compressor. And a control device.

As shown in FIG. 6 (A), during the cooling operation, when the temperature of the refrigerant flowing through the indoor heat exchanger (evaporation temperature) falls below the lower temperature set value (2 ° C.), as shown in FIG. The operating capacity of the compressor is reduced to prevent the indoor heat exchanger from freezing, and the operating capacity of the compressor is controlled to be increased when the temperature exceeds the upper temperature set value (6 ° C.).

As shown in FIG. 6 (B), the control device operates when the temperature of the refrigerant (condensing temperature) flowing through the indoor heat exchanger becomes equal to or higher than the upper temperature set value (56 ° C.) during the heating operation. The operating capacity of the compressor is lowered to prevent a high load from acting on the compressor due to the occurrence of a high pressure cut, and the operating capacity of the compressor is increased when the temperature drops below the lower temperature set value (52 ° C). It is controlled to make it happen.

[0005]

However, in the above-described method for controlling the operating capacity of the compressor, the upper and lower temperature set values (6 ° C., 2 ° C.) during the cooling operation, and the upper and lower temperature settings during the heating operation are different. The temperature set values (56 ° C., 52 ° C.) are set to constant values regardless of the level of the operating capacity of the compressor, since simplification of control is given priority. Therefore, the lower temperature set value (2 ° C.) is too low during the cooling operation, and the upper temperature set value (56 ° C.) is too high during the heating operation, so that the compressor excessively increases the capacity. There are cases. As a result, in the cooling operation, inconveniences such as cold air discomfort and dew condensation in the indoor heat exchanger occur, and in the heating operation, the upper space in the room is excessively heated due to an increase in the blowing temperature. .

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described circumstances, and provides an air conditioner capable of appropriately controlling the temperature of blown air and suppressing excessive capacity operation of the compressor to realize energy saving. An object of the present invention is to provide a compressor operation capacity control method and an air conditioner.

[0007]

According to the first aspect of the present invention,
An outdoor unit equipped with an outdoor heat exchanger and a compressor whose capacity can be controlled, and an indoor unit equipped with an indoor heat exchanger, wherein the parameter of the refrigerant flowing through the indoor heat exchanger is set to a lower parameter during cooling operation. When the value becomes equal to or less than the value, during the heating operation, when the value becomes equal to or more than the upper parameter set value, in the compressor operating capacity control method of the air conditioner that controls to decrease the operating capacity of the compressor, When operating at a predetermined capacity or more, the parameter of the refrigerant flowing through the indoor heat exchanger, during the cooling operation, when it becomes less than or equal to the lower parameter set value higher than the lower parameter set value, during the heating operation The control is performed so that the operating capacity of the compressor is reduced when the change becomes equal to or greater than the upper parameter set value lower than the upper parameter set value.

According to a second aspect of the present invention, in the first aspect of the present invention, when the compressor is operated at a predetermined capacity or less, the parameter setting for increasing the operating capacity of the compressor during cooling operation is performed. The value is set higher than the lower parameter setting value, and during the heating operation, the lower parameter setting value for increasing the operating capacity of the compressor is set lower than the upper parameter setting value.

According to a third aspect of the present invention, there is provided an outdoor unit having an outdoor heat exchanger and a compressor whose capacity can be controlled, and an indoor unit having an indoor heat exchanger. The control device controls the compressor of the compressor when the parameter of the refrigerant flowing through the indoor heat exchanger is equal to or less than the lower parameter set value during the cooling operation, and is equal to or greater than the upper parameter set value during the heating operation. In the air-conditioning apparatus that controls to lower the operating capacity, the control device is configured such that, when the compressor is operating at a predetermined capacity or more, the parameter of the refrigerant flowing through the indoor heat exchanger is the cooling operation. When the lower parameter set value is higher than the lower parameter set value or less, during the heating operation, when the upper parameter set value is lower than the upper parameter set value or higher, The operating capacity of the serial compressor and controls so as to lower.

The invention according to claim 1 or 3 includes:
It has the following effects:

[0011] The parameters (temperature, pressure) of the refrigerant flowing through the indoor heat exchanger when the compressor is operating at a predetermined capacity or more that can afford to lower the operating capacity of the compressor.
However, during the cooling operation, the compression is performed when the lower parameter setting value is higher than the lower parameter setting value, and when the heating operation is performed, the upper parameter setting value is lower than the lower parameter setting value. Since the operating capacity of the compressor is reduced, the discomfort of the cool air resulting from the excessive capacity operation of the compressor, dew condensation in the indoor heat exchanger (during cooling operation), or excessive heating of the indoor upper space due to the rise in the temperature of the blown air It is possible to prevent inappropriateness of the blow-off air temperature (during heating operation) and the like, and to realize energy saving by suppressing the operation capability of the compressor.

The second aspect of the invention has the following operation.

When the compressor is operated at a predetermined capacity or less, the upper parameter set value for increasing the operating capacity of the compressor is set higher than the changed lower parameter set during the cooling operation, and the above parameter is set during the heating operation. When the lower parameter setting value for increasing the operating capacity of the compressor is set lower than the upper parameter setting value, in each of the cooling operation and the heating operation, when the compressor is operated at a predetermined capacity or more. Hunting can be prevented in the control of the operating capacity of the compressor between the above control and the control in the case of operating the compressor at a predetermined capacity or less.

[0014]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a circuit diagram showing a refrigerant circuit of an air conditioner in which an embodiment of a method for controlling a compressor operating capacity of an air conditioner according to the present invention is performed.

As shown in FIG. 1, the air conditioner 10
It has an outdoor unit 11, an indoor unit 12, and a control device 13, and an outdoor refrigerant pipe 14 of the outdoor unit 11 and an indoor refrigerant pipe 15 of the indoor unit 12 are connected via connection pipes 24, 25.

The outdoor unit 11 is installed outdoors, and a variable capacity compressor 16 is disposed in an outdoor refrigerant pipe 14. An accumulator 17 is provided on the suction side of the compressor 16 and a four-way valve 18 is provided on the discharge side thereof. Connected via a pipe 14,
The outdoor heat exchanger 19 is connected to the outdoor refrigerant pipe 14 to the four-way valve 18.
And is connected via An outdoor fan 20 that blows air toward the outdoor heat exchanger 19 is disposed adjacent to the outdoor heat exchanger 19.

On the other hand, the indoor unit 12 is installed indoors, and an indoor heat exchanger 21 is disposed in the indoor refrigerant pipe 15.
An electric expansion valve 22 is provided near the indoor heat exchanger 21 in the indoor refrigerant pipe 15. An indoor fan 23 for blowing air to the indoor heat exchanger 21 is disposed adjacent to the indoor heat exchanger 21.

The control device 13 controls the operation of the outdoor unit 11 and the indoor unit 12.
, The compressor 16, the four-way valve 18 and the outdoor fan 20,
In addition, it controls the electric expansion valve 22 and the indoor fan 23 in the indoor unit 12 respectively.

When the four-way valve 18 is switched by the control device 13, the air conditioner 10 is set to the cooling operation or the heating operation. That is, the control device 13 controls the four-way valve 1
8 is switched to the cooling side, the refrigerant flows as shown by the solid line arrow, and the outdoor heat exchanger 19 is connected to the condenser and the indoor heat exchanger 2
1 becomes an evaporator and enters a cooling operation state, and the indoor heat exchanger 21 of the indoor unit 12 cools the room. Also, the control device 1
When 3 switches the four-way valve 18 to the heating side, the refrigerant flows as indicated by the dashed arrow, the indoor heat exchanger 21 becomes a condenser, and the outdoor heat exchanger 19 becomes an evaporator, and enters a heating operation state.
The indoor heat exchanger 21 of the indoor unit 12 heats the room.

The control device 13 controls the opening of the electric expansion valve 22 in the indoor unit 12 according to the air conditioning load of the indoor unit 12, and controls the fan drive system of the indoor fan 23 in the indoor unit 12.

The compressor 16 is of a variable capacity (capacity) type. In this embodiment, the operating capacity is changed by adjusting the frequency of the current supplied to the electric motor of the compressor 16 by an inverter. Things. The control device 13 controls the inverter to increase the frequency of the current supplied to the compressor 16, thereby increasing the operation capability of the compressor 16, and decreasing the frequency of the current to reduce the frequency of the current. The operating capacity of the machine 16 is lowered.

The controller 13 controls the operating capacity of the compressor 16 as shown in FIGS. 2 and 3 during the cooling operation and the heating operation according to the current operating capacity of the compressor 16. At this time, the indoor heat exchanger 21 is provided with a temperature sensor 26 for detecting the temperature as a parameter of the refrigerant flowing in the indoor heat exchanger 21 as shown in FIG. The temperature sensor 26 detects the evaporation temperature of the refrigerant during the cooling operation of the air conditioner 10, and detects the condensation temperature of the refrigerant during the heating operation. The refrigerant temperature detected by the temperature sensor 26 is transmitted to the control device 13.

As shown in FIG. 2, during the cooling operation, the controller 13 controls the current frequency of the current supplied to the compressor 16 to 25 Hz or more and less than 30 Hz (capacity operation at a predetermined capacity or less of the compressor 16). In this case, when the evaporation temperature of the refrigerant detected by the temperature sensor 26 becomes equal to or lower than the first lower temperature set value (2 ° C.) as the lower parameter set value, the operating capacity of the compressor 16 is lowered. When the indoor heat exchanger 21 is prevented from freezing, and when the temperature becomes equal to or higher than the first upper temperature set value (9 ° C.) as the upper parameter set value, the compressor 1
6 and further, when it is between the first lower temperature set value and the first upper temperature set value, the compressor 1
Inhibit the increase in driving ability of 6.

The control device 13 determines that the frequency of the current supplied to the compressor 16 at the present time is 3 during the cooling operation.
0 Hz or more (capacity operation at a predetermined capacity or more of the compressor 16)
In this case, when the evaporation temperature of the refrigerant detected by the temperature sensor 26 becomes equal to or lower than the second lower temperature set value (6 ° C.) as the changed parameter set value, the operating capacity of the compressor 16 is lowered. And when the temperature becomes equal to or higher than the second upper temperature set value (8 ° C.), the operating capacity of the compressor 16 is increased, and further, the second lower temperature set value and the second upper temperature set value are compared with each other. During the period, the increase in the operating capacity of the compressor 16 is prohibited.

The second lower temperature set value (6 ° C.) is set higher than the first lower temperature set value (2 ° C.) by the temperature difference T1. The present invention prevents cold air discomfort caused by the temperature of air blown from the compressor 12 being too low and dew condensation in the indoor heat exchanger 21, and suppresses the operation capability of the compressor 16 to achieve energy saving.

When the operating capacity of the compressor 16 is equal to or less than a predetermined capacity, when the refrigerant temperature (evaporation temperature) detected by the temperature sensor 26 becomes equal to or less than the first lower temperature set value (2 ° C.), The reason for reducing the operation capability of the compressor 16 is to give priority to the continuous operation of the compressor 16 over prevention of the above-mentioned cold air discomfort and the prevention of dew condensation in the indoor heat exchanger 21, The priority is to prevent discomfort caused by returning.

Further, the first upper temperature set value (9 ° C.) is set higher than the second lower temperature set value (6 ° C.) by the temperature difference T2, and the operation capacity of the compressor 16 is controlled to a predetermined capacity or less. When,
The control of the operation capacity of the predetermined capacity or more
It is considered that hunting does not occur in the control of the driving ability of the vehicle.

That is, for example, the first upper temperature set value (9 ° C.)
Is set to, for example, 5 ° C. below the second lower temperature set value (6 ° C.), the refrigerant temperature detected by the temperature sensor 26 is lower than 5 ° C. In operation (the frequency of the current supplied to the compressor 16 is 25 Hz or more and 30 Hz), despite the control for increasing the capacity of the compressor 16, as a result, the capacity of the compressor 16 is equal to or more than a predetermined capacity (compressor 16. Supply current frequency is 3
(0 Hz or more), it is determined that the refrigerant temperature detected by the temperature sensor 26 is equal to or less than the second lower temperature set value (6 ° C.) in the operation of the compressor 16 with the predetermined capacity or more. Control is performed to lower the ability, and hunting occurs in the control. In order to prevent this hunting, the first upper temperature set value (9 ° C.) is set higher than the second lower temperature set value (6 ° C.).

On the other hand, as shown in FIG. 3, during the heating operation, the control device 13 determines that the frequency of the current supplied to the compressor 16 is 25 Hz or more and less than 30 Hz (compressor 1).
6 when the refrigerant condensing temperature detected by the temperature sensor 26 becomes equal to or higher than a first upper temperature set value (56 ° C.) as an upper parameter set value. The operation capacity of the compressor 16 is lowered to prevent a high load from acting on the compressor 16 due to the occurrence of a high pressure cut, and the first lower temperature set value (48 ° C.) or less as the lower parameter set value , The operating capacity of the compressor 16 is increased, and the increase in the operating capacity of the compressor 16 is prohibited when the operating capacity is between the first upper temperature set value and the first lower temperature set value. Let it.

The controller 13 also determines that the frequency of the current supplied to the compressor 16 at present is 3 during the heating operation.
0 Hz or more (capacity operation at a predetermined capacity or more of the compressor 16)
In this case, when the condensing temperature of the refrigerant detected by the temperature sensor 26 becomes equal to or higher than the second upper temperature set value (52 ° C.) as the changed upper parameter set value, the operating capacity of the compressor 16 is decreased. Further, when the temperature becomes equal to or less than the second lower temperature set value (50 ° C.), the operating capacity of the compressor 16 is increased, and the operation between the second upper temperature set value and the second lower temperature set value is performed. , The increase in the operating capacity of the compressor 16 is prohibited.

The second upper temperature set value (52.degree. C.) is set lower than the first upper temperature set value (56.degree. C.) by a temperature difference T3. In addition to preventing the overheating of the indoor upper space due to the rise in the temperature of the air blown from the indoor unit 12,
The operation capacity of the compressor 16 is suppressed to achieve energy saving.

When the operating capacity of the compressor 16 is equal to or less than the predetermined capacity, when the refrigerant temperature (condensation temperature) detected by the temperature sensor 26 becomes equal to or higher than the first upper temperature set value (56 ° C.), The reason why the operating capacity of the compressor 16 is reduced is that the continuous operation of the compressor 16 is given priority over the prevention of excessive heating of the upper space in the room due to the increase in the outlet temperature.

Further, the first lower temperature set value (48 ° C.)
Is set lower than the second upper temperature set value (52 ° C.) by the temperature difference T4, and in the control of the operating capacity of the compressor 16 at a predetermined capacity or less and the control of the operating capacity at the predetermined capacity or more, As in the case of the cooling operation, the control of the operating capacity of the compressor 16 is considered so that hunting does not occur.

Next, referring to FIG. 4 and FIG.
The control of the operating capacity of the compressor 16 according to the above will be further described.

[A] Cooling Operation (FIG. 4) During the cooling operation, as shown in FIG.
First, it is determined whether or not the operating capacity of the compressor 16 is equal to or higher than a predetermined capacity, that is, whether or not the frequency of the current supplied to the compressor 16 is equal to or higher than, for example, 30 Hz (S1).

When the compressor 16 is operating at or above the predetermined capacity, the controller 13 sets the upper temperature set value to the second upper temperature set value (8 ° C.) and sets the lower temperature set value to the second lower temperature set value. The temperature is set to the set value (6 ° C.) (S2).

When the compressor 16 is operating at the predetermined capacity or less, the controller 13 sets the upper temperature set value to the first upper temperature set value (9 ° C.) and sets the lower temperature set value to the first upper temperature set value. Each is set to the lower temperature set value (2 ° C.) (S3).

Next, the controller 13 determines whether the refrigerant temperature (evaporation temperature) detected by the temperature sensor 26 is equal to or lower than the lower temperature set value (first lower temperature set value, second lower temperature set value). Is determined (S4), and if it is below, the operating capacity of the compressor 16 is lowered (S5).

When the evaporating temperature of the refrigerant detected by the temperature sensor 26 is equal to or higher than the lower temperature set value (first lower temperature set value, second lower temperature set value), this evaporating temperature is set to the upper temperature set value ( It is determined whether it is equal to or more than the first upper temperature set value and the second upper temperature set value (S6).
Is increased (S7), and if it is below, the increase in the operating capacity of the compressor 16 is prohibited.

[B] Heating Operation (FIG. 5) During the heating operation, as shown in FIG.
First, it is determined whether or not the operating capacity of the compressor 16 is equal to or higher than a predetermined capacity, that is, whether or not the frequency of the current supplied to the compressor 16 is equal to or higher than 30 Hz (S11).

When the compressor 16 is operating at or above the predetermined capacity, the controller 13 sets the upper temperature set value to the second upper temperature set value (52 ° C.) and sets the lower temperature set value to the second lower temperature set value. The temperature is set to the set value (50 ° C.) (S12).

When the compressor 16 is operated at the predetermined capacity or less, the control device 13 sets the upper temperature set value to the first upper temperature set value (56 ° C.) and the lower temperature set value to the second upper temperature set value. Set the lower temperature set value (48 ° C.) (S1
3).

Next, the controller 13 determines whether or not the refrigerant temperature (condensation temperature) detected by the temperature sensor 26 is equal to or higher than the upper temperature set value (first upper temperature set value, second upper temperature set value). Is determined (S14), and if it is the above, the operating capacity of the compressor 16 is lowered (S15).

When the condensing temperature of the refrigerant detected by the temperature sensor 26 is equal to or lower than the upper temperature set value (first upper temperature set value, second upper set value), the condensing temperature is reduced to the lower temperature set value (second upper set value). It is determined whether the temperature is equal to or less than the first lower temperature set value and the second lower temperature set value (S16).
6 is increased (S17), and if it is the above, the increase in the operating capacity of the compressor 16 is prohibited.

With the above configuration, the present embodiment has the following advantages.

When the compressor 16 is operated at a predetermined capacity (the frequency of the current supplied to the compressor 16 is 30 Hz) or more which can afford to lower the operation capacity of the compressor 16, the indoor heat exchanger 21 When the temperature of the refrigerant flowing through the heater becomes equal to or lower than the second lower temperature set value (6 ° C.) higher than the first lower temperature set value (2 ° C.) during the cooling operation, the first upper temperature set value is set during the heating operation. When the temperature exceeds a second upper temperature set value (52 ° C.) lower than the value (56 ° C.), the operating capacity of the compressor 16 is reduced. Discomfort and indoor heat exchanger 2
In addition, it is possible to prevent inappropriateness of the outlet air temperature such as dew condensation at the time of cooling operation (1) or excessive heating (at the time of heating operation) of the indoor upper space due to an increase in the temperature of the outlet air.
Energy saving can be realized by suppressing the driving ability of No. 6.

When the operating capacity of the compressor 16 is equal to or lower than a predetermined capacity (the frequency of the current supplied to the compressor 16 is 30 Hz) or less, during the cooling operation, the first upper temperature set value (for increasing the operating capacity of the compressor 16). 9 ° C.) is set higher than the second lower temperature set value (6 ° C.), and during the heating operation, the first lower temperature set value (48) that increases the operating capacity of the compressor 16 is set.
° C) is set lower than the second upper temperature set value (52 ° C). Therefore, in each of the cooling operation and the heating operation, control for operating the compressor 16 at a predetermined capacity or more, In the case of operation at the capacity or less,
Hunting can be prevented in controlling the operating capacity of the compressor 16.

Although the present invention has been described based on one embodiment, the present invention is not limited to this. For example, the predetermined capacity of the compressor 16 is not limited to the case where the frequency of the current supplied to the compressor 16 is 30 Hz, and may be a frequency of another value.

Further, instead of the temperature sensor 26, a pressure sensor for detecting the pressure as a parameter of the refrigerant flowing through the indoor heat exchanger 21 is installed in the indoor heat exchanger 21, and the refrigerant pressure is set to the above-mentioned refrigerant temperature. Since the control device 13 is in a proportional relationship with the control device 13, the control device 13 performs the cooling operation based on the evaporation pressure detected by the pressure sensor, and also performs the heating operation based on the condensing pressure detected by the pressure sensor.
The operating capacity of the compressor 16 may be controlled in the same manner as described above.

Although the compressor 16 has been described in which the frequency of the supply current is adjusted by the inverter to change the capacity, the compressor 16 (compressor) capable of changing the capacity (capacity) stepwise without using the inverter is described. Unit). For example, two compressors are used, and one compressor is connected between two cylinders by a bypass passage provided with a valve to realize 100% capacity operation and 50% capacity operation. Yes, other compressors are constant speed compressors whose capacity cannot be controlled, and a compressor unit that can change the capacity (capacity) in steps of one horsepower unit by combining these two compressors and an external valve is used. You may.

[0052]

As described above, according to the present invention, when the compressor is operated at a predetermined capacity or more, the parameter of the refrigerant flowing through the indoor heat exchanger is set to the predetermined value during the cooling operation. When the operation becomes equal to or less than the changed parameter setting value higher than the lower parameter setting value set when the compressor is operated at the capacity or less, the heating operation is performed when the compressor is operated at the predetermined capacity or less. When the change becomes lower than the parameter set value and becomes equal to or more than the parameter set value, the compressor is controlled to lower the operation, so that the temperature of the blown air can be made appropriate,
Excessive capacity operation of the compressor can be suppressed to save energy.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing a refrigerant circuit of an air conditioner in which an embodiment of a method for controlling a compressor operating capacity of an air conditioner according to the present invention is performed.

FIG. 2 is a conceptual diagram illustrating control of the capacity of a compressor during a cooling operation performed by a control device in the air-conditioning apparatus of FIG. 1;

FIG. 3 is a conceptual diagram showing capacity control of a compressor during a heating operation performed by a control device in the air-conditioning apparatus of FIG. 1;

FIG. 4 is a flowchart showing the capacity control of the compressor during the cooling operation performed by the control device of FIG. 1;

FIG. 5 is a flowchart showing the capacity control of the compressor during the heating operation performed by the control device of FIG. 1;

FIG. 6 is a conceptual diagram showing control of the capacity of a compressor during a cooling operation (A) and a heating operation (B) performed by a control device in a conventional air conditioner.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Air conditioner 11 Outdoor unit 21 Indoor unit 13 Control device 16 Compressor 21 Indoor heat exchanger 26 Temperature sensor

Claims (3)

[Claims] 1. An outdoor unit having an outdoor heat exchanger and a compressor whose capacity can be controlled, and an indoor unit having an indoor heat exchanger, wherein a parameter of a refrigerant flowing through the indoor heat exchanger is cooling. In operation, when the lower parameter set value or less, during the heating operation when the upper parameter set value or more, in the compressor operating capacity control method of the air conditioner that controls to reduce the operating capacity of the compressor. When the compressor is operating at a predetermined capacity or more, when the parameter of the refrigerant flowing through the indoor heat exchanger is not more than the lower parameter set value higher than the lower parameter set value during the cooling operation, Further, during the heating operation, when the changed upper parameter set value is lower than the upper parameter set value, the control is performed so as to lower the operating capacity of the compressor. Compressor operating capacity control method of an air conditioner that. 2. When the compressor is operating at a predetermined capacity or less, during a cooling operation, an upper parameter set value for increasing the operating capacity of the compressor is set higher than a changed lower parameter set value. 2. The method according to claim 1, wherein the lower parameter setting value for increasing the operating capacity of the compressor is set lower than the upper parameter setting value. 3. A control device, comprising: an outdoor unit having an outdoor heat exchanger and a compressor capable of controlling the capacity; and an indoor unit having an indoor heat exchanger, wherein the control device for controlling the operating capacity of the compressor comprises: When the parameter of the refrigerant flowing through the indoor heat exchanger is equal to or less than the lower parameter set value during the cooling operation, and is equal to or greater than the upper parameter set value during the heating operation, the operating capacity of the compressor is decreased. In the air conditioner to be controlled, when the controller is operating the compressor at a predetermined capacity or more, the parameter of the refrigerant flowing through the indoor heat exchanger is lower than the lower parameter set value during the cooling operation. During the heating operation, when the lower parameter setting value is equal to or less than the high lower parameter setting value, the operating capacity of the compressor is equal to or higher than the lower parameter setting value lower than the upper parameter setting value. An air conditioning apparatus characterized by controlling so as to lower.