JPH11182912A - Air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air conditioner, which can perform dehumidifying operation with a sufficient ability, while avoiding the decline in indoor temperature, without being influenced by the cooling operation of other indoor units, in an indoor unit that performs the dehumidifying operation. SOLUTION: The dehumidifying operation of an indoor unit A and the cooling operation of an indoor unit B are performed at the same time. The valve travel of a flow rate control valve 4 corresponding to the indoor unit A is controlled, so that the difference ΔTcj between the detected temperature Tca of a heat exchanger temperature sensor 14 in the indoor unit A and the detected temperature Tcb of an auxiliary heat exchanger temperature sensor 15 becomes a predetermined value X. Moreover, the valve travel of the flow rate control valve 5 corresponding to the indoor unit B is controlled, so that the difference ΔTcs between the detected temperature Tc of the heat exchanger temperature sensor 24 in the indoor unit B and the detected temperature Ts of a refrigerant temperature sensor 7 becomes a predetermined value Y.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-room air conditioner having a plurality of indoor units.

[0002]

2. Description of the Related Art An outdoor unit having a compressor and an outdoor heat exchanger, a plurality of indoor units each having an indoor heat exchanger, and refrigeration for circulating refrigerant by connecting these indoor units in parallel with the outdoor unit. There is a multi-chamber air conditioner equipped with a cycle.

In this multi-room air conditioner, during cooling, the flow rate of refrigerant to each indoor unit is adjusted so that the difference between the temperature of the indoor heat exchanger and the temperature of the suction refrigerant of the compressor becomes a predetermined value. At the time of dehumidification, the operating frequency of the compressor is lowered to lower the cooling capacity, and the air volume of the indoor fan of the indoor unit is reduced, so-called weak cooling is performed.

[0004]

In the indoor unit which performs the dehumidifying operation by the weak cooling as described above, the evaporation temperature of the indoor heat exchanger becomes high, and the sufficient dehumidifying capacity cannot be obtained or the indoor temperature decreases. There is a problem of being large.

In addition, when the operating frequency of the compressor increases due to the cooling operation of another indoor unit, the cooling capacity of the indoor unit on the dehumidifying side increases, and the indoor temperature further decreases. Is generated.

If the operating frequency of the compressor is reduced due to the cooling operation of another indoor unit, the evaporation temperature of the indoor heat exchanger in the indoor unit on the dehumidifying side is further increased, and the dehumidifying capacity is further reduced. It happens.

[0007] The present invention has been made in view of the above circumstances,
The purpose is that the indoor unit performing the dehumidifying operation is not affected by the cooling operation of other indoor units,
It is an object of the present invention to provide an air conditioner capable of performing a dehumidifying operation with sufficient capacity while avoiding a decrease in room temperature.

[0008]

Means for Solving the Problems First Invention (Claim 1)
An air conditioner includes an outdoor unit including a compressor and an outdoor heat exchanger, an indoor heat exchanger, a heat exchanger temperature sensor for detecting the temperature of the indoor heat exchanger, an auxiliary indoor heat exchanger, and an auxiliary indoor heat exchanger. A first indoor unit having an auxiliary heat exchanger temperature sensor for detecting the temperature of the indoor heat exchanger; and a second indoor unit having an indoor heat exchanger and a heat exchanger temperature sensor for detecting the temperature of the indoor heat exchanger. And a refrigeration cycle for circulating the refrigerant by connecting each indoor unit in parallel with the outdoor unit and circulating a refrigerant, a plurality of flow control valves for adjusting the flow rate of the refrigerant to each indoor unit, and the compressor A refrigerant temperature sensor for detecting a temperature of the refrigerant to be sucked in, a dehumidifying operation of the first indoor unit and a cooling operation of the second indoor unit are simultaneously performed, and a corresponding one of the flow control valves corresponds to the first indoor unit. Heat flow in the first indoor unit The difference between the temperature detected by the temperature sensor and the temperature detected by the auxiliary heat exchanger temperature sensor is controlled to be a predetermined value X, and the opening of the flow control valve corresponding to the second indoor unit is changed by the heat exchanger in the second indoor unit. Control means for controlling the difference between the temperature detected by the temperature sensor and the temperature detected by the refrigerant temperature sensor to be a predetermined value Y.

That is, in the air conditioner of the first invention,
The dehumidifying operation of the first indoor unit and the cooling operation of the second indoor unit are simultaneously executed, and the opening degree of the flow control valve corresponding to the first indoor unit is determined by the temperature detected by the heat exchanger temperature sensor in the first indoor unit and the auxiliary. The difference between the detected temperature of the heat exchanger temperature sensor is controlled to be a predetermined value X, and the opening degree of the flow control valve corresponding to the second indoor unit is adjusted to the detected temperature of the heat exchanger temperature sensor in the second indoor unit. Control is performed such that the difference between the temperature detected by the refrigerant temperature sensor and the temperature detected by the refrigerant temperature sensor becomes a predetermined value Y.

The air conditioner according to the second invention (claim 2) is the air conditioner according to the first invention, further comprising a compressor for simultaneously executing the dehumidifying operation of the first indoor unit and the cooling operation of the second indoor unit. Operating frequency limiting means for setting a limiting value for a decrease in the operating frequency of the operating frequency.

An air conditioner according to a third aspect of the present invention is the air conditioner according to the first aspect of the present invention, further comprising the step of simultaneously executing the dehumidifying operation of the first indoor unit and the cooling operation of the second indoor unit. Operating frequency limiting means for setting a limit value for an increase in the operating frequency of the operating frequency.

An air conditioner according to a fourth invention (claim 4) is the air conditioner according to the first invention, further comprising an indoor fan provided in each indoor unit, a dehumidifying operation of the first indoor unit, and a second indoor unit. Air-conditioning means for reducing the air volume of the indoor fan in the second indoor unit as the operating frequency of the compressor decreases when the cooling operation is simultaneously performed.

[0013] In the air conditioner of the fifth invention (claim 5), in the first invention, the predetermined value X of the control means is higher than in the case of an operation other than the simultaneous execution of the dehumidifying operation and the cooling operation. In the air conditioner according to a sixth aspect of the present invention (claim 6), in the first aspect, the predetermined value Y of the control means is higher than in the case of an operation other than the simultaneous execution of the dehumidifying operation and the cooling operation.

[0014]

[1] Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 2, a plurality of indoor units (first indoor units) A and indoor units (second indoor units)
An indoor unit (B) is connected in parallel with an outdoor unit (C) by piping, thereby constituting a heat pump type refrigeration cycle.

That is, the outdoor heat exchanger 3 is connected to the discharge port of the compressor 1 via the four-way valve 2 by piping, and the outdoor heat exchanger 3 is connected to the flow control valves 4 and 5. The auxiliary indoor heat exchanger 11a and the indoor heat exchanger 11 are sequentially connected to the flow control valve 4 by piping, and the indoor heat exchanger 11 is connected to the suction port of the compressor 1 via the four-way valve 2.

An indoor heat exchanger 21 is connected to the flow control valve 5 by piping, and the indoor heat exchanger 21 is connected to the suction port of the compressor 1 via the four-way valve 2. In the cooling operation and the dehumidifying operation, the refrigerant flows in the direction of the arrow shown in the figure, and in the heating operation, the refrigerant flows in the opposite direction.

An outdoor fan 6 is provided for the outdoor heat exchanger 3. An indoor fan 12 is provided for the indoor heat exchanger 11 and the auxiliary indoor heat exchanger 11a. Indoor heat exchanger 2
1, an indoor fan 22 is provided.

The indoor temperature sensors 13 and 23 are provided in the flow paths of the intake air of the indoor fans 12 and 22, respectively. The indoor temperature sensor 13 detects the indoor temperature Ta of the room where the indoor unit A is installed. The indoor temperature sensor 23 detects the indoor temperature Ta of the room where the indoor unit B is installed.

The indoor heat exchanger 11 has a heat exchanger temperature sensor 1
4 and the auxiliary heat exchanger temperature sensor 15 is mounted on the auxiliary indoor heat exchanger 11a. The heat exchanger temperature sensor 14
The temperature Tc of the indoor heat exchanger 11 is detected. The auxiliary heat exchanger temperature sensor 15 detects the temperature Tj of the indoor heat exchanger 11a.

The indoor heat exchanger 21 has a heat exchanger temperature sensor 2
4 Install. The heat exchanger temperature sensor 24 detects the temperature Tc of the indoor heat exchanger 21. A refrigerant temperature sensor 7 is attached to a pipe between the four-way valve 2 and the suction port of the compressor 1. The refrigerant temperature sensor 7 detects the temperature T of the refrigerant sucked into the compressor 1.
s is detected.

FIG. 1 shows the control circuit. The outdoor control unit 40 of the outdoor unit C is connected to a commercial three-phase AC power supply (200 V) 30. The outdoor control unit 40 includes a main control unit 41, an inverter circuit 42, and a fan speed switching circuit 43. The outdoor control unit 40 is connected with the compressor motor 1M, the four-way valve 2, the flow control valves 4 and 5, the outdoor fan motor 6M, and the refrigerant temperature sensor 7.

The inverter circuit 42 rectifies the power supply voltage, converts the rectified power supply voltage into a voltage having a frequency and a level corresponding to a command from the main control unit 41, and outputs the voltage. This output is supplied as drive power to the compressor motor 1M. By changing the output frequency of the inverter circuit 42, the compressor 1
(= Rotational speed) can be changed.

The fan speed switching circuit 43 includes a main control unit 41
The speed of the outdoor fan motor 6M is switched in accordance with the instruction. A pair of power supply lines 32 are derived from the outdoor control unit 40, and the indoor control unit 50 of the master unit A is connected to the power supply lines 32. Further, one signal line 33 is connected between the outdoor control unit 40 and the indoor control unit 50. A circuit formed through the signal line 33 and one side of the power supply line 32 transmits a power supply voltage-synchronized serial signal between the outdoor control unit 40 and the indoor control unit 50.

The indoor control unit 50 includes a main control unit 51 and a fan speed switching circuit 52. Fan speed switching circuit 5
2 is an indoor fan motor 1 according to a command from the main control unit 51.
The 2M rotation speed is switched.

The indoor control unit 60 of the indoor unit B is connected to a power line connection terminal (to which the power line 32 is connected) of the indoor control unit 50 via a pair of power lines 34. The indoor control unit 60 includes:
A main control unit 61 and a fan speed switching circuit 62 are provided.
The fan speed switching circuit 62 switches the speed of the indoor fan motor 22M according to a command from the main control unit 61.

A pair of power supply lines 35 are led out of the indoor control unit 50, and a remote control device (hereinafter abbreviated as a remote controller) D is connected to the power supply lines 35. Further, one signal line 36 is connected between the indoor control unit 50 and the remote controller D. A circuit formed through the signal line 36 and one side of the power supply line 35 transmits a serial signal between the indoor control unit 50 and the remote controller D.

One of the power supply line connection terminals (to which the power supply line 35 is connected) and the signal line connection terminal (to which the signal line 36 is connected) of the indoor control section 50 are connected via a pair of signal lines 37 to the room. The control unit 60 is connected. The circuit formed via this signal line 37 allows the remote control 70 and the indoor control unit 6
Serial signal transmission is performed between 0 and 0.

The remote controller 70 sets the operating conditions and covers signal transmission between the indoor units B and C. And
The outdoor control unit 40 and the indoor control units 50 and 60 include the following (1) to (3) as main functional units.

(1) The dehumidifying operation of the indoor unit A and the cooling operation of the indoor unit B are simultaneously executed, and the opening degree of the flow control valve 4 corresponding to the indoor unit A is detected by the heat exchanger temperature sensor 14 in the indoor unit A. The difference ΔTcj between the temperature Tc and the detected temperature Tj of the auxiliary heat exchanger temperature sensor 15 is controlled to be a predetermined value X, and the opening degree of the flow control valve 5 corresponding to the indoor unit B is set to the indoor unit B.
Control means for controlling the difference ΔTcs between the detected temperature Tc of the heat exchanger temperature sensor 24 and the detected temperature Ts of the refrigerant temperature sensor 7 to a predetermined value Y.

(2) Operating frequency limiting means for setting a limiting value F1 for a decrease in the operating frequency F of the compressor 1 when simultaneously performing the dehumidifying operation of the indoor unit A and the cooling operation of the indoor unit B. (3) When the dehumidifying operation of the indoor unit A and the cooling operation of the indoor unit B are simultaneously executed, the limit value F is set with respect to the increase in the operating frequency F of the compressor 1.
Operation frequency limiting means provided with 2.

Next, the operation of the above configuration will be described with reference to the flowchart of FIG. When the indoor unit A is in the dehumidifying mode (YES in step 101) and the indoor unit B is in the cooling mode (YES in step 102), the detection temperature Tc of the heat exchanger temperature sensor 14 and the auxiliary heat exchanger temperature sensor in the indoor unit A The difference ΔTcj from the 15 detected temperatures Tj is obtained (step 103).
), The opening of the flow control valve 4 is controlled so that the temperature difference ΔTcj becomes a predetermined value X (step 105). Further, a difference ΔTcs between the detected temperature Tc of the heat exchanger temperature sensor 24 and the detected temperature Ts of the refrigerant temperature sensor 7 in the indoor unit B is determined (step 106), and the flow rate regulating valve is adjusted so that the temperature difference ΔTcs becomes a predetermined value Y. 5 is controlled (step 107).

By this control, the opening degree of the dehumidification-side flow control valve 4 is set small, the amount of refrigerant flowing through the auxiliary indoor heat exchanger 11a and the indoor heat exchanger 11 decreases, and the cooling-side flow control valve 5 Is set large, and the amount of refrigerant flowing to the indoor heat exchanger 21 increases.

As the amount of the refrigerant flowing through the auxiliary indoor heat exchanger 11a and the indoor heat exchanger 11 decreases, the temperature drop of the auxiliary indoor heat exchanger 11a increases, but the temperature drop of the indoor heat exchanger 11 decreases. Become. Therefore, the cooling operation and the dehumidifying effect occur in the auxiliary indoor heat exchanger 11a, but only the dehumidifying effect occurs in the indoor heat exchanger 11. That is, it is possible to avoid a decrease in room temperature while obtaining a sufficient dehumidifying ability.

Since a large amount of refrigerant flows through the indoor heat exchanger 21 on the cooling side, necessary cooling capacity can be obtained. At this time, the temperature Tj of the auxiliary indoor heat exchanger 11a becomes lower than the temperature Tc of the indoor heat exchanger 21 of the indoor unit B due to the influence of the pressure loss of the indoor unit B.

On the other hand, separately from the opening control, the operating frequency F of the compressor 1 is set according to the dehumidifying load of the indoor unit A and the cooling load of the indoor unit B (step 107). Then, the set operating frequency F is compared with the lowering limit value F1 (step 108). If the operating frequency F is lower than the limit value F1, the limit value F1 is set as the operating frequency F (step 10).
8 YES, step 109).

When the operating frequency F is set low due to a decrease in the cooling load of the indoor unit B or the like, the evaporation temperature of the indoor heat exchanger 21 of the indoor unit B rises. Indoor heat exchanger 11a and indoor heat exchanger 11
Similarly, the evaporation temperature of the indoor unit A also increases, and the dehumidifying ability of the indoor unit A decreases.

Therefore, a limit value F1 is provided for a decrease in the operating frequency F, thereby suppressing an increase in the evaporating temperature of the indoor heat exchanger 21 and consequently evaporating the auxiliary indoor heat exchanger 11a and the indoor heat exchanger 11. A rise in temperature is suppressed, and a decrease in the dehumidifying capacity of the indoor unit A is avoided.

Further, the set operating frequency F is compared with the limit value F2 for increasing (step 110). If the operating frequency F is higher than the limit value F2, the limit value F2 is set as the operating frequency F (step 110). YES, step 111).

When the operating frequency F is set high, for example, due to an increase in the cooling load of the indoor unit B, the evaporation temperature of the indoor heat exchanger 21 of the indoor unit B decreases. Indoor heat exchanger 11a and indoor heat exchanger 11
Similarly, the evaporating temperature of the indoor unit A also decreases, and the dehumidifying ability of the indoor unit A increases too much.

Therefore, a limit value F2 is provided for an increase in the operating frequency F, thereby suppressing a decrease in the evaporation temperature of the indoor heat exchanger 21 and, consequently, the evaporation of the auxiliary indoor heat exchanger 11a and the indoor heat exchanger 11. The temperature drop is suppressed, and unnecessary increase of the dehumidifying capacity of the indoor unit A is avoided.

[2] A second embodiment of the present invention will be described. The main functions of the outdoor control unit 40 and the indoor control units 50 and 60 include the following (4) instead of (2) and (3) of the first embodiment.

(4) When the dehumidifying operation of the indoor unit A and the cooling operation of the indoor unit B are simultaneously executed, the air volume of the indoor fan 22 in the indoor unit B on the cooling side is reduced with the decrease in the operating frequency F of the compressor 1. Means to control the air volume.

The other structure is the same as that of the first embodiment. The operation has steps 121 to 127 instead of steps 108 to 110 of the first embodiment, as shown in the flowchart of FIG.

That is, the dehumidifying operation of the indoor unit A and the indoor unit B
When the cooling operation is simultaneously performed, the set operation frequency F is compared with the set values 60 Hz, 45 Hz, and 35 Hz, respectively (step 12).
1, 122, 123), when the operating frequency F is 60 Hz or more (NO in step 121), the air flow rate of the indoor fan 22 (the rotation speed of the indoor fan motor 22M) in the indoor unit B on the cooling side is set to a predetermined initial value. The value is set (step 124).

When the operating frequency F is lower than 60 Hz and higher than 45 Hz (YES in step 121, NO in step 122), the air flow rate of the indoor fan 22 is set to a value lower than the initial value by 100 rotations as the rotation speed of the indoor fan motor 22M. Set (Step
125).

When the operating frequency F is lower than 45 Hz or higher than 35 Hz (YES in step 122, NO in step 123), the air flow rate of the indoor fan 22 is set to a value lower than the initial value by 150 rotations as the rotation speed of the indoor fan motor 22M. Set (Step
126).

If the operating frequency F is less than 45 Hz (step 12
3) YES, the air volume of the indoor fan 22 is set to a value lower than the initial value by 200 rotations as the rotation speed of the indoor fan motor 22M (step 127).

When the operating frequency F is set low, for example, due to a decrease in the cooling load of the indoor unit B, the evaporation temperature of the indoor heat exchanger 21 of the indoor unit B rises. Indoor heat exchanger 11a and indoor heat exchanger 11
Similarly, the evaporation temperature of the indoor unit A also increases, and the dehumidifying ability of the indoor unit A decreases.

As a countermeasure, as the operating frequency F becomes lower, the air volume of the indoor fan 22 on the cooling side is reduced, thereby suppressing an increase in the evaporation temperature of the indoor heat exchanger 21 on the cooling side, and consequently the auxiliary indoor heat exchanger 11a. And indoor heat exchanger 11
Of the indoor unit A is prevented from lowering.

[3] A third embodiment of the present invention will be described. In the third embodiment, the dehumidifying operation of the indoor unit A and the indoor unit B
As the predetermined value X for opening control used in the simultaneous execution of the cooling operation, a value higher than that in the case of the operation other than the simultaneous execution of the dehumidification operation and the cooling operation is selected.

That is, by selecting a high value as the predetermined value X which is the target value of the temperature difference ΔTcj, the evaporation temperatures of the auxiliary indoor heat exchanger 11a and the indoor heat exchanger 11 are reduced, and the dehumidifying ability of the indoor unit A is reduced. It is improved in the increasing direction.

[4] A fourth embodiment of the present invention will be described. In the fourth embodiment, the dehumidifying operation of the indoor unit A and the indoor unit B
As the predetermined value Y for opening control used in the simultaneous execution of the cooling operation, a value higher than that in the case of the operation other than the simultaneous execution of the dehumidification operation and the cooling operation is selected.

That is, by selecting a high value as the predetermined value Y which is the target value of the temperature difference ΔTcs, the evaporation temperature of the indoor heat exchanger 21 on the cooling side is lowered, and the auxiliary indoor heat exchanger 11a and the indoor heat exchange The evaporating temperature of the unit 11 is decreased, and the dehumidifying ability of the indoor unit A is improved in the increasing direction. It should be noted that even if control is performed by combining the fourth embodiment and the third embodiment, the dehumidifying ability of the indoor unit A can be similarly improved in the increasing direction.

[0054]

As described above, according to the present invention, the dehumidifying operation of the first indoor unit and the cooling operation of the second indoor unit are simultaneously executed, and the opening of the flow control valve corresponding to the first indoor unit is controlled. The difference between the temperature detected by the heat exchanger temperature sensor in the first indoor unit and the temperature detected by the auxiliary heat exchanger temperature sensor is a predetermined value X.
And the opening degree of the flow control valve corresponding to the second indoor unit is set such that the difference between the detected temperature of the heat exchanger temperature sensor in the second indoor unit and the detected temperature of the refrigerant temperature sensor is equal to a predetermined value Y. With such a configuration, the indoor unit performing the dehumidifying operation can perform the dehumidifying operation with sufficient capacity while avoiding a decrease in the indoor temperature without being affected by the cooling operation of the other indoor units. An air conditioner can be provided.

[Brief description of the drawings]

FIG. 1 is a block diagram of a control circuit of each embodiment.

FIG. 2 is a configuration diagram of a refrigeration cycle of each embodiment.

FIG. 3 is a flowchart for explaining the operation of the first embodiment.

FIG. 4 is a flowchart for explaining the operation of the second embodiment.

[Explanation of symbols]

A: indoor unit, B: indoor unit (first indoor unit), C: indoor unit (second indoor unit), D: remote control (remote control device), 1 ... compressor, 2 ... four-way valve, 3 ... outdoor heat Exchanger,
11a: auxiliary indoor heat exchanger, 11, 21: indoor heat exchanger, 13, 23: indoor temperature sensor, 14, 24: heat exchanger temperature sensor, 15: auxiliary cat temperature sensor, 40: outdoor control unit, 50, 60 indoor control unit.

 ──────────────────────────────────────────────────の Continued on the front page (72) Koji Wada, Inventor 336 Tatehara, Fuji-shi, Shizuoka Prefecture Inside the Fuji Plant, Toshiba Corporation (72) Inventor Tsukasa Sasaki 336 Tatehara, Fuji City, Shizuoka Prefecture, Fuji Plant Toshiba Corporation

Claims (6)

[Claims] 1. An outdoor unit having a compressor and an outdoor heat exchanger, an indoor heat exchanger, a heat exchanger temperature sensor for detecting a temperature of the indoor heat exchanger, an auxiliary indoor heat exchanger, and an auxiliary indoor heat exchanger. A first indoor unit having an auxiliary heat exchanger temperature sensor for detecting the temperature of the heat exchanger, and a second indoor unit having an indoor heat exchanger and a heat exchanger temperature sensor for detecting the temperature of the indoor heat exchanger A refrigeration cycle that connects the indoor units in parallel with the outdoor unit and circulates a refrigerant; a plurality of flow control valves for adjusting the flow rate of the refrigerant to the indoor units; and suctioning the compressor. A refrigerant temperature sensor for detecting a temperature of the refrigerant to be supplied, and a dehumidifying operation of the first indoor unit and a cooling operation of the second indoor unit, which are simultaneously executed, and correspond to the first indoor unit of the respective flow control valves. Heat exchange in the first indoor unit with the opening of the flow control valve The difference between the temperature detected by the unit temperature sensor and the temperature detected by the auxiliary heat exchanger temperature sensor is controlled to a predetermined value X, and the opening degree of the flow control valve corresponding to the second indoor unit is changed by heat exchange in the second indoor unit. Control means for controlling a difference between a detection temperature of the heater temperature sensor and a detection temperature of the refrigerant temperature sensor to be a predetermined value Y. 2. The air conditioner according to claim 1, wherein when the dehumidifying operation of the first indoor unit and the cooling operation of the second indoor unit are simultaneously executed, a limit value is set for a decrease in an operating frequency of the compressor. An air conditioner further comprising: an operating frequency limiting means provided with: 3. The air conditioner according to claim 1, wherein when the dehumidifying operation of the first indoor unit and the cooling operation of the second indoor unit are simultaneously executed, a limit value is set for an increase in an operating frequency of the compressor. An air conditioner further comprising: an operating frequency limiting means provided with: 4. The air conditioner according to claim 1, wherein an indoor fan provided in each of the indoor units, and simultaneously performing a dehumidifying operation of the first indoor unit and a cooling operation of the second indoor unit, As the operating frequency of the compressor decreases,
An air conditioner further comprising: an air volume control unit configured to reduce an air volume of the indoor fan in the second indoor unit. 5. The air conditioner according to claim 1, wherein the predetermined value X of the control means is higher than in the case of an operation other than the simultaneous execution of the dehumidifying operation and the cooling operation. 6. The air conditioner according to claim 1, wherein the predetermined value Y of the control means is higher than in the case of an operation other than the simultaneous execution of the dehumidifying operation and the cooling operation.