JP2022177478A - air conditioner - Google Patents

Abstract

To provide an air conditioner for hardly causing the shortage of water content to be dew-condensed or frost-formed per unit time on a surface of an indoor heat exchanger of an indoor unit in which cleaning operation is executed when the cleaning operation and cooling operation are executed in separate indoor units.SOLUTION: When environmental conditions in a first period for cleaning operation and cooling operation to be executed in two indoor units are the same as environmental conditions in a second period for cooling operation to be executed in each of the two indoor units, the frequency of a compressor in the first period is higher than the frequency of the compressor in the second period.SELECTED DRAWING: Figure 5

Description

The present disclosure relates to air conditioners.

2. Description of the Related Art There is known an air conditioner in which moisture in the air is condensed or frosted on the surface of an indoor heat exchanger, and the moisture is used to clean the indoor heat exchanger. In addition, in Patent Document 1, in a multi-type air conditioner having one outdoor unit and a plurality of indoor units, when a predetermined condition is satisfied, at least the time zone in which the cleaning process is performed in the plurality of indoor units Overlapping of the portions is disclosed.

Japanese Patent No. 6786019

Patent Literature 1 does not disclose that one indoor unit performs a cooling operation and another indoor unit performs a cleaning process (cleaning operation) at the same time. In such a case, in order to improve the comfort level of the user in the room where the indoor unit is installed, the cleaning operation is performed by operating the compressor in the outdoor unit at a frequency suitable for the cooling operation. The amount of moisture that condenses or frosts per unit time on the surface of the indoor heat exchanger of the indoor unit that is installed may be small.

An object of the present disclosure is to provide an air conditioner in which insufficient amount of moisture that condenses or frosts per unit time on the surface of an indoor heat exchanger of an indoor unit in which cleaning operation is performed is unlikely to occur.

An air conditioner indoor unit according to the present disclosure includes a refrigerant circuit in which an outdoor unit including a compressor, a first indoor unit including an indoor heat exchanger, and a second indoor unit including an indoor heat exchanger are connected via refrigerant pipes. and a controller. The control unit performs a cleaning operation including cleaning the indoor heat exchanger by causing the indoor heat exchanger to function as an evaporator, and a cooling operation in which air conditioning is performed by causing the indoor heat exchanger to function as an evaporator. is executable. Then, in the air conditioner according to the present disclosure, the environmental conditions in the first period during which the first indoor unit is in the cleaning operation and the second indoor unit is in the cooling operation are The frequency of the compressor during the first period is the same as the environmental condition during the second period during the cooling operation of the second indoor unit during the cooling operation, and the frequency of the compressor during the second period is higher than the frequency of

As a result, the temperature of the indoor heat exchanger of the first indoor unit in the first period can be reduced, and the amount of condensation or frost that adheres to the indoor heat exchanger of the first indoor unit per unit time due to the cleaning operation The shortage of quantity can be suppressed.

The control unit may set the frequency of the compressor in the first period to a frequency at which the temperature of the indoor heat exchanger of the first indoor unit determined by the cooling capacity of the outdoor unit is equal to or lower than the dew point temperature. This promotes adhesion of moisture to the indoor heat exchanger of the first indoor unit.

Further, the control unit adjusts the frequency of the compressor in the first period to that of the first indoor unit determined from the cooling capacity of the outdoor unit and the amount of air blown out from the first indoor unit and the second indoor unit. The frequency may be such that the temperature of the indoor heat exchanger is equal to or lower than the dew point temperature. This promotes adhesion of moisture to the indoor heat exchanger of the first indoor unit.

The control unit may determine the frequency of the compressor in the first period so that a predetermined amount of condensation or frost is obtained in the first indoor unit within a predetermined period of time from the start of the cleaning operation. . As a result, the compressor can be operated at a frequency corresponding to the amount of water required for cleaning and the time required for cleaning.

The control unit may control the first indoor unit such that the amount of air blown out from the second indoor unit during the first period is less than the amount of air directed by the user. As a result, the place where the second indoor unit is installed can be prevented from being too cold.

In the air conditioner according to the present disclosure, the refrigerant circuit includes a first on-off valve capable of blocking the flow of refrigerant from the outdoor unit to the first indoor unit during the cleaning operation and the cooling operation; A second on-off valve may be connected that can block the flow of refrigerant from the outdoor unit to the second indoor unit during the cleaning operation and the cooling operation. At this time, the control unit sets the threshold temperature of the indoor temperature at which the second on-off valve changes from the open state to the closed state during the first period, when the cleaning operation is not performed in the first indoor unit. It may be higher than the threshold temperature. As a result, the amount of refrigerant flowing into the first indoor unit can be increased and the temperature of the indoor heat exchanger can be lowered, making it easier to quickly secure the required moisture adhesion amount.

The control unit sets the execution period of the cleaning operation when the cooling operation is performed in the second indoor unit during the cleaning operation of the first indoor unit to during the cleaning operation of the first indoor unit. may be longer than the execution period of the cleaning operation when the second indoor unit is currently out of operation. This makes it easier to ensure the required moisture adhesion amount.

When the control unit determines that the temperature of the indoor heat exchanger of the first indoor unit is higher than the dew point temperature during the first period, the control unit blows off from the second indoor unit within the first period. The first indoor unit may be controlled such that the amount of air supplied is less than the amount of air directed by the user. As a result, the temperature of the indoor heat exchanger of the first indoor unit is lowered to the dew point temperature or lower.

The controller determines that the temperature of the indoor heat exchanger of the first indoor unit is equal to or lower than the dew point temperature during the first period, and the amount of air blown out from the second indoor unit within the first period. may control the first indoor unit so that the air volume becomes smaller than the air volume instructed by the user. As a result, the temperature of the indoor heat exchanger of the first indoor unit is further lowered below the dew point temperature, making it easier to quickly ensure the required moisture adhesion amount.

In the air conditioner according to the present disclosure, the refrigerant circuit includes a first on-off valve capable of blocking the flow of refrigerant from the outdoor unit to the first indoor unit during the cleaning operation and the cooling operation; A second on-off valve may be connected that can block the flow of refrigerant from the outdoor unit to the second indoor unit during the cleaning operation and the cooling operation. At this time, when the control unit determines that the temperature of the indoor heat exchanger of the first indoor unit is higher than the dew point temperature during the first period, the second on-off valve is opened during the first period. may be higher than the threshold temperature when the cleaning operation in the first indoor unit is not being performed. As a result, the temperature of the indoor heat exchanger of the first indoor unit is lowered to the dew point temperature or lower.

In the air conditioner according to the present disclosure, the refrigerant circuit includes a first on-off valve capable of blocking the flow of refrigerant from the outdoor unit to the first indoor unit during the cleaning operation and the cooling operation; A second on-off valve may be connected that can block the flow of refrigerant from the outdoor unit to the second indoor unit during the cleaning operation and the cooling operation. At this time, when the controller determines that the temperature of the indoor heat exchanger of the first indoor unit is equal to or lower than the dew point temperature during the first period, the second on-off valve is opened during the first period. A threshold temperature of the room temperature at which the first indoor unit is closed may be higher than the threshold temperature when the cleaning operation is not being performed in the first indoor unit. As a result, the temperature of the indoor heat exchanger of the first indoor unit is further lowered below the dew point temperature, making it easier to quickly ensure the required moisture adhesion amount.

When the control unit determines that the temperature of the indoor heat exchanger of the first indoor unit is equal to or lower than the dew point temperature during the first period, at least part of the cleaning operation of the first indoor unit is performed in the first period. The execution period of the cleaning operation when performed within one period is longer than the execution period of the cleaning operation when the second indoor unit is out of operation during the cleaning operation of the first indoor unit. You can make it longer. This makes it easier to ensure the required moisture adhesion amount.

When the controller determines that a predetermined amount of condensation or frost cannot be obtained within a predetermined period of time during the cleaning operation, the amount of air blown out from the second indoor unit within the first period is The first indoor unit may be controlled so that the air volume becomes smaller than the air volume instructed by the user. As a result, the temperature of the indoor heat exchanger of the first indoor unit is lowered, so that the temperature of the indoor heat exchanger of the first indoor unit is further lowered, making it easier to quickly secure the required moisture adhesion amount.

In the air conditioner according to the present disclosure, the refrigerant circuit includes a first on-off valve capable of blocking the flow of refrigerant from the outdoor unit to the first indoor unit during the cleaning operation and the cooling operation; A second on-off valve may be connected that can block the flow of refrigerant from the outdoor unit to the second indoor unit during the cleaning operation and the cooling operation. At this time, the control unit closes the second on-off valve from the open state during the first period when it is determined that a predetermined amount of condensation or frost cannot be obtained within a predetermined period of time during the cleaning operation. A threshold temperature of the indoor temperature at which the state is reached may be set higher than the threshold temperature when the cleaning operation is not performed in the first indoor unit. As a result, the temperature of the indoor heat exchanger of the first indoor unit is further lowered, making it easier to quickly ensure the required moisture adhesion amount.

When the controller determines that a predetermined amount of condensation or frost cannot be obtained within a predetermined period of time during the cleaning operation, at least part of the cleaning operation of the first indoor unit is stopped during the first period. The execution period of the cleaning operation when the cleaning operation is performed within the second indoor unit is longer than the execution period of the cleaning operation when the second indoor unit is out of operation during the cleaning operation of the first indoor unit. you can This makes it easier to ensure the required moisture adhesion amount.

The control unit adjusts the execution period of the cleaning operation when it is determined that the temperature of the indoor heat exchanger of the first indoor unit is lower than a predetermined temperature lower than the dew point temperature in the first period. The period may be shorter than the execution period of the cleaning operation when it is determined that the temperature of the indoor heat exchanger of the first indoor unit is equal to or higher than the predetermined temperature during the period. As a result, when it is expected that the required amount of water adhesion can be secured, the execution period of the cleaning operation can be shortened.

1 is a configuration diagram of a multi-type air conditioner according to an embodiment of the present disclosure; FIG. FIG. 2 is an external view of the indoor unit shown in FIG. 1 as viewed obliquely from below; FIG. 2 is a block diagram of the multi-type air conditioner shown in FIG. 1; It is a flow chart of washing operation. FIG. 2 is a flowchart showing a procedure for determining a compressor frequency when simultaneously performing a cleaning operation in an indoor unit and a cooling operation in another indoor unit in the multi-type air conditioner shown in FIG. 1; FIG. 4 is a flowchart showing procedures for air volume adjustment and expansion valve control in indoor units in which cooling operation is performed, and procedures for determining the execution period of cleaning operation. FIG. 7 is a flow chart showing detailed procedures of air volume adjustment and expansion valve control shown in FIG. 6 ; FIG.

(overall structure)
Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. FIG. 1 shows a configuration diagram of a multi-type air conditioner 1 according to an embodiment of the present disclosure. As shown in FIG. 1, the multi-type air conditioner 1 includes a refrigerant circuit 3 in which an outdoor unit 10 and three indoor units 20A, 20B, and 20C are connected via refrigerant pipes through which refrigerant passes. there is The indoor unit 20A has an indoor heat exchanger 24A and an indoor fan 25A. The indoor unit 20B has an indoor heat exchanger 24B and an indoor fan 25B. The indoor unit 20C has an indoor heat exchanger 24C and an indoor fan 25C. In this embodiment, the number of indoor units is three, but the number of indoor units can be any number of two or more. Also, in the following description, the room in which the indoor unit 20A is installed is called room A, the room in which 20B is installed is called room B, and the room in which the indoor unit 20C is installed is called room C.

The outdoor unit 10 includes a compressor 11, a four-way switching valve 12, an outdoor heat exchanger 13, an outdoor fan 15, an accumulator 16, and three electric expansion valves EVA, EVB, EVC. One of the four ports of the four-way switching valve 12 is connected to the discharge side of the compressor 11, another one is connected to one end of the outdoor heat exchanger 13, and another one is connected to one end of the accumulator 16, Still another one is connected to one end of three indoor heat exchangers 24A, 24B, 24C via three refrigerant piping connections 18A, 18B, 18C. The other end of the outdoor heat exchanger 13 is connected to one ends of three electric expansion valves EVA, EVB and EVC. The other ends of the three electric expansion valves EVA, EVB and EVC are connected to the other ends of the three indoor heat exchangers 24A, 24B and 24C via three refrigerant pipe connections 17A, 17B and 17C, respectively. there is The other end of the accumulator 16 is connected to the suction side of the compressor 11 . Indoor fans 25A, 25B and 25C are arranged near the indoor heat exchangers 24A, 24B and 24C, respectively. The indoor fan 25A is driven by an indoor fan motor 26A (see FIG. 3). The indoor fans 25B and 25C are also driven by indoor fan motors (not shown).

In the refrigerant circuit 3, a compressor 11, a four-way switching valve 12, an outdoor heat exchanger 13, electric expansion valves EVA, EVB, and EVC, indoor heat exchangers 24A, 24B, and 24C, and an accumulator 16 are , are connected by refrigerant pipes. The refrigerant circuit 3 uses, for example, slightly flammable R32 as a refrigerant.

A discharge pipe temperature sensor 31 is arranged on the discharge side of the compressor 11 . An outdoor heat exchanger temperature sensor 32 for detecting the outdoor heat exchanger temperature is arranged in the outdoor heat exchanger 13, and an outdoor temperature sensor 33 for detecting the outdoor temperature is arranged near the outdoor heat exchanger 13. are placed.

An indoor heat exchanger temperature sensor 45A that detects the indoor heat exchanger temperature is arranged in the indoor heat exchanger 24A, and an indoor temperature sensor 46A that detects the indoor temperature and an indoor humidity An indoor humidity sensor 47A is arranged for detection. An indoor heat exchanger temperature sensor 45B that detects the indoor heat exchanger temperature is arranged in the indoor heat exchanger 24B, and an indoor temperature sensor 46B that detects the indoor temperature and an indoor humidity An indoor humidity sensor 47B is arranged for detection. An indoor heat exchanger temperature sensor 45C for detecting the indoor heat exchanger temperature is arranged in the indoor heat exchanger 24C. An indoor humidity sensor 47C is arranged to detect humidity.

FIG. 2 is a perspective view of the indoor unit 20A viewed obliquely from below. The indoor unit 20A is a ceiling cassette type (ceiling embedded type) indoor unit. In this embodiment, the three indoor units 20A, 20B, and 20C are all ceiling cassette type indoor units, but some or all of them may be wall-mounted or floor-mounted indoor units.

2, the indoor unit 20A includes a casing body 101, a rectangular panel 102 attached to the lower side of the casing body 101, and a grill 103 detachably attached to the panel 102. . Although not shown in FIG. 2, the surface of the panel 102 has light emitting diodes (LEDs), and the display unit 28A (see FIG. 3) notifies the user by means of light, characters, graphics, or the like. ) is provided.

A blowout port 110 is provided along the short side of the panel 102 on one side in the longitudinal direction of the panel 102 . A flap 120 is attached to the panel 102 . The flap 120 is driven by the flap driving motor 27A (see FIG. 3) to rotate relative to the panel 102 within a predetermined angular range, thereby opening and closing the blowout port 110. As shown in FIG. FIG. 3 shows a state where the outlet 110 is closed by the flap 120 .

A drain socket 107 protrudes from the side wall of the casing body 101 . A drain hose (not shown) is connected to the drain socket 107 from the outside. Further, pipe connection portions 105 and 106 protrude from side walls of the casing main body 101 . Refrigerant pipes (not shown) are connected to the pipe connection portions 105 and 106 from the outside. Suspension fittings 111 to 113 protrude laterally from the casing main body 101 . Also, an electrical component section 108 is arranged near the casing main body 101 .

(control system)
Next, the control system of the multi-type air conditioner 1 will be described. FIG. 3 is a block diagram of the air conditioner 1 according to this embodiment. Since the three indoor units 20A, 20B, and 20C have the same structure in this embodiment, the indoor unit 20A will be mainly described here. Also, the illustration of the indoor units 20B and 20C is simplified in FIG.

The outdoor unit 10 includes an outdoor control unit 51 including a microcomputer including an arithmetic device and a storage device, an input/output circuit, and the like. The indoor units 20A, 20B, and 20C respectively include indoor controllers 52A, 52B, and 52C each including a microcomputer including an arithmetic device and a storage device, an input/output circuit, and the like. The outdoor control unit 51 and the indoor control unit 52A are connected by a communication line LA, the outdoor control unit 51 and the indoor control unit 52B are connected by a communication line LB, and the outdoor control unit 51 and the indoor control unit 52C are connected by a communication line LC. connected by The outdoor controller 51 and the three indoor controllers 52A, 52B, and 52C communicate with each other via communication lines LA, LB, and LC, so that the outdoor controller 51 and the indoor controllers 52A, 52B, and 52C operate as multi-type air It operates as the control section 50 of the harmony machine 1 .

Temperature detection signals from the discharge pipe temperature sensor 31 , the outdoor heat exchanger temperature sensor 32 , and the outdoor temperature sensor 33 are supplied to the outdoor control unit 51 . The outdoor control unit 51 also controls the compressor 11, the four-way switching valve 12, the outdoor fan motor 14, the electric expansion valves EVA, EVB, EVC, and the like.

The indoor controller 52A is supplied with detection signals from the indoor heat exchanger temperature sensor 45A, the indoor temperature sensor 46A, and the indoor humidity sensor 47A. The indoor control unit 52A also controls the indoor fan motor 26A, the flap drive motor 27A, the display unit 28A, the communication unit 29A, and the like. The communication unit 29A performs wireless communication with a user-operable remote controller (hereinafter referred to as "remote controller"), not shown. The control unit 50 controls the operation of the air conditioner 1 in response to commands from the remote controller. The remote control has a liquid crystal display unit or a light emitting diode (LED), and can notify the user by means of light, characters, graphics, or the like. In addition to or instead of the liquid crystal display unit or the light-emitting diode, the remote controller may have a speaker that notifies the user by sound. Below, 28 A of display parts and a speaker may be collectively called an alerting|reporting part.

In the multi-type air conditioner 1 according to the present embodiment, the control unit 50 controls the air conditioning operation including the cooling operation and the heating operation, the air blowing operation for rotating the indoor fans 25A, 25B, and 25C in each indoor unit. A cleaning operation can be performed.

In the multi-type air conditioner 1 according to this embodiment, when the indoor unit 20A performs cooling operation, the outdoor control unit 51 switches the four-way switching valve 12 to the position indicated by the dotted line in FIG. start driving. At this time, the outdoor control unit 51 opens the electric expansion valve EVA to a predetermined degree of opening, while closing the electric expansion valves EVB and EVC. The high-temperature and high-pressure gas refrigerant discharged from the compressor 11 is condensed by heat exchange with the outdoor air in the outdoor heat exchanger 13 functioning as a condenser by the outdoor control unit 51 rotating the outdoor fan 15. It becomes a liquid refrigerant. Next, the liquid refrigerant from the outdoor heat exchanger 13 reaches the indoor heat exchanger 24A after being decompressed by the electric expansion valve EVA. When the indoor control unit 52A operates the indoor fan 25A, the depressurized liquid refrigerant evaporates through heat exchange with the indoor air in the indoor heat exchanger 24A functioning as an evaporator to become a gaseous refrigerant. Return to the inhalation side. Further, the air cooled by the indoor heat exchanger 24A is discharged from the blower outlet 110 by the indoor controller 52A moving the flap 120 to the position where the blower outlet 110 opens.

On the other hand, when the indoor unit 20A performs the heating operation, the outdoor control unit 51 switches the four-way switching valve 2 to the solid line position shown in FIG. At this time, the outdoor controller 51 opens all the electric expansion valves EVA, EVB, and EVC to predetermined opening degrees. Therefore, when the indoor unit 20A performs the heating operation, the high-temperature refrigerant also flows into the other indoor units 20B and 20C. This is to prevent the refrigerant from staying in the indoor units 20B and 20C that do not perform the heating operation and in the refrigerant pipes before and after them. The high-temperature and high-pressure gas refrigerant discharged from the compressor 11 is condensed by heat exchange with indoor air in the indoor heat exchanger 24A functioning as a condenser by the indoor control unit 52A operating the indoor fan 25A. It becomes a liquid refrigerant. Next, the refrigerant from the indoor heat exchangers 24A, 24B, 24C reaches the outdoor heat exchanger 13 after being decompressed by the electric expansion valves EVA, EVB, EVC. When the outdoor control unit 51 rotates the outdoor fan 15, the decompressed refrigerant evaporates by exchanging heat with the outdoor air in the outdoor heat exchanger 13 functioning as an evaporator to become a gaseous refrigerant, which is sucked into the compressor 11. back to the side. In addition, the air warmed by the indoor heat exchanger 24A is discharged from the blower outlet 110 by the indoor controller 52A moving the flap 120 to the position where the blower outlet 110 opens.

The control contents of the outdoor unit 10 and the indoor units 20A, 20B, and 20C by the control unit 50 are changed according to commands from the remote controller. By operating the remote controller, the user can request the multi-type air conditioner 1 to select heating operation or cooling operation, start operation, stop operation, set room temperature and air volume, and start and stop cleaning operation. By operating the remote control, the user can select whether the air volume is set to a fixed mode or an automatic mode. In the fixed mode, the air volume is fixed at a level selected by the user from a plurality of levels (for example, three levels of "strong wind", "weak wind", and "light wind"). In the automatic mode, the optimum air volume is automatically selected from multiple stages according to the difference between the set temperature and the room temperature. Also, the user can change the posture (position) of the flap 120 by operating the remote controller. In this embodiment, the flap 120 is in a position to close the outlet 110 when the indoor unit is stopped, and is in one of a plurality of positions in which the degree of opening the outlet 110 differs during air conditioning operation and cleaning operation. .

(Washing operation)
Next, details of the cleaning operation performed by the multi-type air conditioner 1 in this embodiment will be described with further reference to FIG. The following description is based on the assumption that the cleaning operation is requested for one indoor unit 20A while all the indoor units are stopped, and the other indoor units 20B and 20C are not air-conditioned until the cleaning operation is completed. It is assumed that no driving is required.

First, when the remote controller of the indoor unit 20A is operated to request the indoor unit 20A to perform the cleaning operation, the controller 50 executes the evaporator phase of the cleaning operation in step S1. Specifically, the four-way switching valve 12 is switched to the position indicated by the dotted line in FIG. 1, and the operation of the compressor 11 is started. Further, the controller 50 drives the indoor fan motor 26A to rotate the indoor fan 25A at a predetermined number of revolutions, and drives the flap drive motor 27A to move the flap 120 to the position where the outlet 110 opens. At this time, the control unit 50 opens the electric expansion valve EVA to a predetermined degree of opening, while closing the electric expansion valves EVB and EVC. As a result, the indoor heat exchanger 24A functions as an evaporator as in the cooling operation, and the evaporator phase of the cleaning operation starts. When the temperature of the indoor heat exchanger 24A becomes higher than 0° C. and below the dew point temperature, moisture in the air begins to condense on the surface of the indoor heat exchanger 24A. The condensed water can clean dirt attached to the surface of the indoor heat exchanger 24A. At this time, the temperature of the indoor heat exchanger 24A may be kept below the freezing point to frost the surface of the indoor heat exchanger 24A with moisture in the air. In this embodiment, the length of the evaporator phase is a predetermined time. The length of the evaporator phase is calculated by the control unit 50 from the environmental conditions (indoor temperature and humidity of room A, outdoor temperature). It may be the time until frost formation. After the evaporator phase ends, the controller 50 stops the operation of the compressor 11 .

Next, in step S2, the controller 50 executes the blowing phase of the cleaning operation. Specifically, following step S1, the indoor fan motor 26A is driven to rotate the indoor fan 25A. Then, the position of the flap 120 is maintained at the same position as in step S1. Since the compressor 11 is stopped in the ventilation phase, the temperature of the indoor heat exchanger 24A is higher than the temperature of the indoor heat exchanger 24A in the evaporator phase. And, normally, the temperature of the indoor heat exchanger 24A exceeds the dew point temperature. By rotating the indoor fan 25A, it is possible to promote the evaporation of moisture condensed on the indoor heat exchanger 24A. In this embodiment, the number of rotations of indoor fan 25A and ventilation time (length of ventilation phase) are being fixed to a fixed value. In the ventilation phase, if the temperature of the indoor heat exchanger 24A is higher than the temperature of the indoor heat exchanger 24A in the evaporator phase, the compressor 11 does not have to be stopped.

In step S3, the controller 50 executes the condenser phase of the cleaning operation. Specifically, the four-way switching valve 12 is switched to the solid line position shown in FIG. 1 to start the operation of the compressor 11 . Moreover, the control part 50 continues from step S2, drives the indoor fan motor 26A, rotates the indoor fan 25A at predetermined rotation speed, and maintains the position of the flap 120 at the same position as the time of step S1. At this time, the controller 50 opens all the electric expansion valves EVA, EVB, and EVC to predetermined opening degrees. As a result, the indoor heat exchanger 24A functions as a condenser as in the heating operation, and the condenser phase of the cleaning operation starts. In the condenser phase, the temperature of the indoor heat exchanger 24A is higher than the temperature of the indoor heat exchanger 24A in the blowing phase. Therefore, the evaporation of moisture remaining on the surface of the indoor heat exchanger 24A can be further accelerated. The length of the condenser phase may be a predetermined amount of time. After the condenser phase ends, the controller 50 stops the compressor 11 and the indoor fan 25A, drives the flap drive motor 27A, and moves the flap 120 to the position where the outlet 110 closes. Note that the condenser phase can be omitted, for example, if the blowing phase of step S2 is made sufficiently long.

(cooling operation + action during cooling operation)
Next, in the multi-type air conditioner 1 according to the present embodiment, when the cooling operation of the indoor unit 20A and the cooling operation of the indoor unit 20B are performed at the same time (the second period in the present disclosure), the compressor frequency A decision procedure will be explained.

First, the control unit 50 acquires environmental conditions and operating conditions regarding the multi-type air conditioner 1 . Here, the environmental conditions include the outdoor temperature detected by the outdoor temperature sensor 33, the room temperature of room A detected by the indoor temperature sensor 46A, and the room temperature of room B detected by the indoor temperature sensor 46B. The operating conditions are the number of rotations of the indoor fan 25A during the cooling operation of the indoor unit 20A (correlated with the air volume), the number of rotations of the indoor fan 25B during the cooling operation of the indoor unit 20B, and the cooling of the indoor units 20A and 20B. Includes room temperature set point for operation.

Then, the control unit 50 determines the initial frequency at the start of operation of the compressor 11 based on the rotational speed of the two fans 25A and 25B, the difference between the room temperature and the set temperature of each of the indoor units 20A and 20B, and the outdoor temperature. to decide. After the start of operation, the frequency is changed for each predetermined sampling period Ts by PI control (Proportional-Integral Control). The frequency of the compressor 11 while the two indoor units 20A and 20B are both in cooling operation is determined based on the difference between the room temperature and the set temperature (room temperature - set temperature). The frequency of machine 11 also drops.

(Operation during cleaning operation + cooling operation)
Next, in the multi-type air conditioner 1 according to the present embodiment, when the evaporator phase of the cleaning operation in the indoor unit 20A and the cooling operation in the indoor unit 20B are simultaneously performed (first period in the present disclosure) The compressor frequency determination procedure will now be described with further reference to FIG. Each step below is executed by the control unit 50 . Note that the indoor unit 20C may be in a resting state in which air conditioning is not performed, or may be in the evaporator phase of the cleaning operation or in the cooling operation. Further, in the following description, simply referring to "cleaning operation" means "evaporator phase".

The procedure for determining the compressor frequency shown in FIG. 5 is started when simultaneous execution of the cleaning operation in the indoor unit 20A and the cooling operation in the indoor unit 20B starts. It does not matter how the indoor units 20A and 20B were operating before this time, but in the following description, it is assumed that the indoor unit 20A has not performed the cleaning operation before the first period. . The following processing is repeatedly executed at predetermined sampling intervals Ts until the cleaning operation in the indoor unit 20A ends.

First, in step S<b>11 , the control unit 50 acquires environmental conditions and operating conditions regarding the multi-type air conditioner 1 . The environmental conditions are the outdoor temperature detected by the outdoor temperature sensor 33, the room temperature of room A detected by the indoor temperature sensor 46A, the humidity of room A detected by the indoor humidity sensor 47A, and the humidity B detected by the indoor temperature sensor 46B. It includes the room temperature and the humidity of the room B detected by the room humidity sensor 47B. The operating conditions include the number of rotations of the indoor fan 25A during the cleaning operation of the indoor unit 20A and the number of rotations of the indoor fan 25B during the cooling operation of the indoor unit 20B.

Next, in step S12, the controller 50 derives the dew point temperature. Dew point temperature can be obtained from room temperature and humidity. To obtain the dew point temperature, a table showing the dew point temperature for each combination of a plurality of room temperatures and a plurality of humidity levels may be used, or a known approximation formula may be used. In the following description, it is assumed that the room temperature, humidity, and dew point temperature are the same in the A and B chambers.

In step S13, the control unit 50 derives the lowest temperatures of the indoor heat exchangers 24A and 24B of the indoor units 20A and 20B from the environmental conditions and operating conditions acquired in step S11. Here, the lowest attainable temperature of the indoor heat exchangers 24A and 24B is the temperature of the indoor heat exchanger 24A when the frequency of the compressor 11 is set to the upper limit value within the set operating range under the acquired environmental conditions and operating conditions. , 24B is the lowest temperature reached. The set operating range is the range of frequencies in which the compressor 11 can operate. The upper limit and lower limit of the set operating range are determined in terms of protection of the compressor 11, protection of pressure, protection of electrical components, avoidance of sound and vibration, and the like. Information about the set operating range is stored in the storage device of the control unit 50 .

To derive the lowest temperatures of the indoor heat exchangers 24A and 24B, first, the cooling capacity of the outdoor unit 10 is derived. The cooling capacity of the outdoor unit 10 can be approximated by, for example, a quadratic expression of the rotation speed (reciprocal of frequency) of the compressor 11 . Also, the cooling capacity increases as the outdoor temperature increases, even if the number of revolutions is the same. According to this example, the cooling capacity of the outdoor unit 10 can be derived by specifying the outdoor temperature and substituting the upper limit value of the set operating range into the approximate expression.

Then, the control unit 50 determines the cooling capacity derived as described above, the total air volume in the indoor unit 20A and the indoor unit 20B, the room temperature of the A room and the B room detected by the indoor temperature sensors 46A and 46B, Based on the humidity of the A room and the B room detected by the indoor humidity sensors 47A, 47B, the lowest temperatures reached by the indoor heat exchangers 24A, 24B are derived. Specifically, the lowest temperature Te of the indoor heat exchangers 24A and 24B can be expressed by the following formula (c1, c2 and c3 are coefficients).
Te = c1 (room temperature - cooling capacity / total air volume) x (1 + c2 x (room temperature - reference room temperature) / reference room temperature) x (1 + c3 x (humidity - reference humidity) / reference humidity)
Note that the lowest temperature Te may be derived approximately from the following equation without using the humidity.
Te ≈ room temperature - cooling capacity / total air volume Further, assuming that the total air volume is a constant value X that does not depend on air volume (for example, a value that depends on the number of indoor units that are performing cooling operation or cleaning operation), from the following equation The lowest reaching temperature Te may be derived approximately.
Te ≒ room temperature - cooling capacity/X

In step S14, the control unit 50 determines whether the minimum attainable temperature derived in step S13 is equal to or lower than the dew point temperature derived in step S12. Note that the dew point temperature in the determination in step S14 is a value obtained by subtracting a predetermined value from the dew point temperature derived in step S12 in order to ensure that moisture adheres to the indoor heat exchanger 24A. well, both are referred to as dew point temperature in this disclosure. If this condition is met (S14: YES), the process proceeds to step S15.

In the following description, the standard dew condensation amount or frost amount is designated as Q0, and the standard time is designated as T0. Q0 may be defined, for example, as the lower limit amount of condensation or frost that must adhere to the indoor heat exchanger to obtain a sufficient cleaning effect. Also, T0 may be defined as the minimum time required to obtain a sufficient cleaning effect when a standard dew condensation amount or frost formation amount Q0 is obtained, for example. In step S15, the control unit 50 sets the temperature (temperature K1) at which the unit standard amount of condensation or frost defined by [Q0/(T0/Ts)] can adhere to the indoor heat exchanger at the sampling period Ts. is equal to or higher than the minimum attainable temperature of the indoor heat exchangers 24A and 24B derived in step S13 based on the environmental conditions and operating conditions acquired in step S11.

If this condition is met (S15: YES), the process proceeds to step S16. In step S16, the control unit 50 derives the frequency F of the compressor 11 at which the temperature of the indoor heat exchanger 24A is the temperature K1, based on the environmental conditions and operating conditions acquired in step S11. The temperature of the indoor heat exchanger 24A depends on the cooling capacity of the outdoor unit 10 and the total air volume of the internal unit 20A and the indoor unit 20B. As time elapses from the start of the cleaning operation, the room temperature decreases or the amount of water vapor decreases and dew condensation becomes less likely to occur, so the frequency F of the compressor 11 derived in step S16 gradually increases. Then, in step S17, the control unit 50 changes the frequency of the compressor 11 to the frequency F derived in step S16. After that, in step S18, when it is determined that the sampling period Ts has passed since the last step S11 (S18: YES), the process returns to step S11.

If the condition of step S15 is not satisfied (S15: NO), the process proceeds to step S19. In step S19, the controller 50 sets the frequency F of the compressor 11 to the upper limit of the set operating range. Then, in step S17, the frequency F of the compressor 11 is changed to the frequency determined in step S19. Also, if the condition of step S14 is not satisfied (S14: NO), the frequency F of the compressor 11 is determined in step S19, and then the process proceeds to step S17. Change to frequency.

In the procedure for determining the compressor frequency described above, if the condition of step S14 is satisfied (S14: YES), the frequency F of the compressor 11 is set to the environment obtained in step S11 without executing the determination of step S15. In terms of conditions and operating conditions, any frequency within a range in which the temperature of the indoor heat exchanger 24A is equal to or lower than the dew point temperature may be determined.

Thus, in the first period, the temperature of the indoor heat exchanger 24A is set to the temperature K1 ( Even if the temperature of the indoor heat exchanger 24A cannot be set to the temperature K1, the frequency of the compressor 11 is set to the upper limit of the set operating range. The frequency is always very high. On the other hand, in the second period, control is performed based on the difference between the room temperature and the set temperature. lower than the upper limit of Therefore, the environmental conditions and operating conditions in the first period (specifically, the outdoor temperature, the room temperature and humidity related to the two indoor units 20A and 20B, the set temperature related to the cooling operation of the indoor unit 20B, and the indoor unit 20A When the air volume and the air volume related to the cooling operation of the indoor unit 20B) are the same as the environmental conditions and operating conditions in the second period, the frequency F of the compressor 11 in the first period determined as described above is It is generally higher than the frequency of the compressor 11 during the second period.

Next, the procedures for adjusting the air volume and controlling the expansion valve in the indoor unit 20B in which the cooling operation is performed, and the procedure for determining the execution period of the cleaning operation in the indoor unit 20A will be described with further reference to FIG. . The flowchart shown in FIG. 6 is executed in parallel with the flowchart showing the procedure for determining the compressor frequency shown in FIG.

First, in step S<b>21 , the control unit 50 acquires environmental conditions and operating conditions regarding the multi-type air conditioner 1 . The environmental conditions are the outdoor temperature detected by the outdoor temperature sensor 33, the room temperature of room A detected by the indoor temperature sensor 46A, the humidity of room A detected by the indoor humidity sensor 47A, and the humidity B detected by the indoor temperature sensor 46B. It includes the room temperature and the humidity of the room B detected by the room humidity sensor 47B. The operating conditions include the number of revolutions of the indoor fan 25A during the cleaning operation of the indoor unit 20A, the number of revolutions of the indoor fan 25B during the cooling operation of the indoor unit 20B, and the set temperature during the cooling operation of the indoor unit 20B.

Then, in step S22, the control unit 50 derives the temperature of the indoor heat exchanger 24A based on the frequency of the compressor 11 at this time and the environmental and operating conditions acquired in step S21. It is determined whether the temperature of the indoor heat exchanger 24A is higher than the dew point temperature derived in step S12. If this condition is met (S22: YES), the process proceeds to step S23.

A detailed procedure for adjusting the air volume of the indoor unit 20B and controlling the expansion valve executed in step S23 will be described with reference to FIG. First, in step S231, the controller 50 determines whether the air volume setting in the indoor unit 20B is in the fixed mode or the automatic mode. If it is the fixed mode (S231: YES), the process proceeds to step S233. If it is in the automatic mode (S231: NO), in step S232, the control unit 50 determines the optimum air volume stage (“strong wind”, “weak wind”, any of the "breeze"). In step S233, the control unit 50 decreases the air volume in the fixed mode set in the indoor unit 20B by the user or the air volume in the automatic mode derived in step S232 by one level. In addition, when step S233 is executed for the second time or later in the flowchart of FIG. , the air volume is further reduced only when the air volume derived (S232) immediately before step S233 is smaller than the air volume derived before that.

Subsequently, in step S234, the control unit 50 determines whether the electric expansion valve EVB is open. If it is open (S234: YES), in step S235, the controller 50 acquires the thermo-off temperature of the indoor unit 20B. Here, the "thermo-off temperature" is the refrigerant supply from the outdoor unit 10 to the indoor heat exchanger 24B of the indoor unit 20B when the indoor unit 20A is not in the cleaning operation and the indoor unit 20B is in the cooling operation. is shut off (the electric expansion valve EVB is closed). The thermo-off temperature may be a value lower than the set temperature by a predetermined temperature (for example, 1°C). Then, in step S236, the controller 50 determines whether the room temperature of the room B detected by the room temperature sensor 46B is equal to or lower than the thermo-off temperature by a predetermined temperature (for example, 2° C.).

If this condition is met (S236: YES), in step S237, the control unit 50 closes the electric expansion valve EVB, terminates the processing of FIG. 7, and proceeds to step S24. If this condition is not met (S236: NO), the process proceeds to step S24 without going through step S237. If it is determined in step S234 that the electric expansion valve EVB is closed (S234: NO), steps S235, S236 and S237 are skipped and the process proceeds to step S24.

In step S24, the control unit 50 calculates an additional time Ti to the execution period of the cleaning operation (evaporator phase). During the sampling period Ts, no new moisture adheres to the indoor heat exchanger 24A. As an example, the addition time Ti may be as long as the sampling period Ts.

If the condition of step S22 is not satisfied (S22: NO), the process proceeds to step S25. In step S25, the controller 50 determines whether the temperature of the indoor heat exchanger 24A derived in step S22 is lower than the temperature K1 described in step S15. In other words, in step S25, it is determined whether the unit standard amount can be dewed or frosted at the sampling period Ts. Any temperature lower than the dew point temperature may be used instead of the temperature K1. If this condition is not met (S25: NO), the process proceeds to step S26. Since step S26 is the same processing as step S23, the details are omitted.

Subsequently, in step S27, the control unit 50 calculates an additional time Tj to the execution period of the cleaning operation (evaporator phase). During the sampling cycle Ts, the amount of water adhering to the indoor heat exchanger 24A becomes smaller than the unit standard amount described above. As an example, the addition time Tj is zero when the temperature of the indoor heat exchanger 24A derived in step S22 is approximately equal to the temperature K1, and increases as the temperature becomes higher than the temperature K1.

If the condition of step S25 is satisfied (S25: YES), the process proceeds to step S28. Note that step S28 is mainly executed when the frequency F of the compressor 11 is determined to be any frequency within a range in which the temperature of the indoor heat exchanger 24A is equal to or lower than the dew point temperature. In step S28, the controller 50 determines whether the room temperature of the room B detected by the room temperature sensor 46B is equal to or lower than the thermo-off temperature. If this condition is met (S28: YES), the controller 50 closes the electric expansion valve EVB in step S29, and proceeds to step S30. If this condition is not met (S28: NO), the process proceeds to step S30 without going through step S29.

In step S30, the control unit 50 calculates the subtraction time Tk to the execution period of the cleaning operation (evaporator phase). In the sampling period Ts, the amount of water adhering to the indoor heat exchanger 24A is greater than the unit standard amount described above. As an example, the subtraction time Tk is zero when the temperature of the indoor heat exchanger 24A derived in step S22 is approximately equal to the temperature K1, and increases as the temperature becomes lower than the temperature K1.

In step S31, the controller 50 determines whether the electric expansion valve EVB is closed. If closed (S31: YES), in step S32, the controller 50 determines whether the room temperature of the room B detected by the room temperature sensor 46B is equal to or higher than the thermo-on temperature. Here, the "thermo-on temperature" means the indoor temperature threshold temperature at which refrigerant supply from the outdoor unit 10 to the indoor heat exchanger 24B of the indoor unit 20B is started (the electric expansion valve EVB opens). The thermo-on temperature may be a value higher than the thermo-off temperature by a predetermined temperature (for example, 4° C.).

If this condition is met (S32: YES), the controller 50 opens the electric expansion valve EVB in step S33. If this condition is not met (S32: NO), the process proceeds to step S34 without going through step S33.

Next, in step S34, the control unit 50 adds the total value of the addition time Ti and the total value of the addition time Tj that have been calculated at this point to the execution period T of the cleaning operation that has been executed at this point. It is determined whether the value obtained by subtracting the total value of Tk is equal to or greater than the above-mentioned standard time T0.

If this condition is not met (S34: NO), the process proceeds to step S35. In step S35, if it is determined that the sampling period Ts has passed since the last step S21 (S35: YES), the process returns to step S21. If the condition of step S34 is satisfied (S34: YES), the process proceeds to step S36. In step S36, the controller 50 ends the evaporator phase of the cleaning operation in the indoor unit 20A. Thereafter, the cleaning operation in the indoor unit 20A sequentially shifts to the ventilation phase (S2) and the condenser phase (S3) described with reference to FIG.

The processing shown in FIG. 6 continues until the evaporator phase in the indoor unit 20A ends. In the ventilation phase, the frequency of the compressor 11 that was changed in step S17 and the air volume of the indoor unit 20B that was reduced in step S233 are restored, and the threshold temperature (S236) of the room temperature for turning off the thermostat of the indoor unit 20B is returned to normal.

(Effect of Embodiment)
As described above, in the present embodiment, when the environmental conditions and operating conditions in the first period are the same as the environmental conditions and operating conditions in the second period, the frequency F of the compressor 11 in the first period is approximately higher than the frequency of the compressor 11 in two periods. Therefore, the temperature of the indoor heat exchanger 24A during the first period is lower than the temperature of the indoor heat exchanger 24A during the second period. Therefore, it is possible to suppress the shortage of the dew condensation amount or the frost amount adhering to the indoor heat exchanger 24A of the indoor unit 20A per unit time due to the cleaning operation.

Further, in this embodiment, the frequency of the compressor 11 is determined so that the temperature of the indoor heat exchanger 24A, which is determined by the cooling capacity of the outdoor unit 10 and the total amount of air blown out from the indoor units 20A and 20B, is equal to or lower than the dew point temperature. Therefore, adhesion of moisture to the indoor heat exchanger 24A is promoted.

Furthermore, in the present embodiment, when the relationship in step S15 that "the temperature K1 is equal to or higher than the minimum attainable temperature" is satisfied at the start of the cleaning operation, the standard dew condensation occurs in the indoor unit 20A within the standard time T0 from the start of the cleaning operation. The frequency of the compressor 11 in the first period is determined so as to obtain the amount of frost or the amount of frost Q0. By doing so, the compressor 11 can be operated at a frequency corresponding to the amount of water required for cleaning and the time required for cleaning.

In addition, in the present embodiment, the amount of air blown out from the indoor unit 20B in cooling operation during the first period is made smaller than the amount instructed by the user (S233). Thereby, in the first period in which the compressor 11 is operated at a high frequency, it is possible to prevent the room temperature of the room B in which the indoor unit 20B is installed from becoming significantly lower than the set temperature. As a result, the indoor unit 20B is prevented from frequently turning off the thermostat. Note that if this control is performed when the temperature of the indoor heat exchanger 24A becomes higher than the dew point temperature (S23), the temperature of the indoor heat exchanger 24A is lowered to the dew point temperature or less. Then, if this control is performed when the temperature of the indoor heat exchanger 24A becomes lower than the dew point temperature and when the unit standard amount cannot be dewed or frosted at the sampling period Ts (S26), indoor heat exchange The temperature of the container 24A is further lowered below the dew point temperature, making it easier to secure the required amount of moisture more quickly.

Further, in the present embodiment, the threshold temperature at which the electric expansion valve EVB closes is set higher than the normal thermo-off temperature (S236), so the amount of refrigerant flowing into the indoor heat exchanger 24A after the electric expansion valve EVB closes increases. do. As a result, the temperature of the indoor heat exchanger 24A of the indoor unit 20A can be lowered more than when the threshold temperature is the same as the normal thermo-off temperature. Therefore, it becomes easier to secure the required amount of moisture in the indoor heat exchanger 24A of the indoor unit 20A more quickly. Note that if this control is performed when the temperature of the indoor heat exchanger 24A is higher than the dew point temperature (S23), the temperature of the indoor heat exchanger 24A of the indoor unit 20A will drop to the dew point temperature or less. be done. Then, if this control is performed when the temperature of the indoor heat exchanger 24A becomes lower than the dew point temperature and when the unit standard amount cannot be dewed or frosted at the sampling period Ts (S26), indoor heat exchange The temperature of the container 24A is further lowered below the dew point temperature, making it easier to secure the required amount of moisture more quickly.

Furthermore, in the present embodiment, except when the temperature of the indoor heat exchanger 24A is lower than the temperature K1, the addition times Ti and Tj (S24, S27) calculated for each sampling period are It is determined whether to end the cleaning operation based on the sequential addition to T (S34). In this way, when the cooling operation is performed in another indoor unit 20B while the indoor unit 20A is in the cleaning operation, the execution period of the cleaning operation is that the indoor unit 20B is out of operation while the indoor unit 20A is in the cleaning operation. It is longer than the execution period of the cleaning operation in the case of Therefore, it becomes easier to secure the necessary amount of water adhesion during the execution period of the cleaning operation. When this control is performed when the temperature of the indoor heat exchanger 24A becomes lower than the dew point temperature and when the unit standard amount cannot be dewed or frosted in the sampling period Ts (S27), the necessary moisture is It becomes easier to secure the adhesion amount.

In addition, in the present embodiment, the subtraction time Tk (S30) calculated for each sampling period during which the temperature of the indoor heat exchanger 24A is lower than the temperature K1 is sequentially added to the execution period T of the cleaning operation that has already been performed. (S34). In this way, when the cooling operation is performed in another indoor unit 20B during the cleaning operation of the indoor unit 20A, the execution period of the cleaning operation when the temperature of the indoor heat exchanger 24A becomes lower than the temperature K1 is It is shorter than the execution period of the cleaning operation when the temperature of the heat exchanger 24A is equal to or higher than the temperature K1. In this way, when it is expected that the required amount of water adhesion can be secured, the execution period of the cleaning operation can be shortened.

(Modification)
The procedure for determining the compressor frequency in FIG. 5 may be omitted, and the frequency F of the compressor 11 may be fixed at the upper limit of the set operating range. Also, if the condition of step S22 is not met, the process may proceed to step S26 without executing step S25.

Although the embodiments have been described above, it will be appreciated that various changes in form and detail may be made without departing from the spirit and scope of the claims.

3 refrigerant circuit 10 outdoor unit 11 compressor 12 four-way switching valve 13 outdoor heat exchanger 16 accumulators 17A, 17B, 17C refrigerant pipe connections 18A, 18B, 18C refrigerant pipe connections 20A, 20B, 20C indoor units 24A, 24B, 24C indoor heat exchanger 25A, 25B, 25C indoor fan 31 discharge pipe temperature sensor 32 outdoor heat exchanger temperature sensor 33 outdoor temperature sensor 45A, 45B, 45C indoor heat exchanger temperature sensor 46A, 46B, 46C indoor temperature sensor EVA, EVB , EVC electric expansion valve

Claims (16)

Air provided with a refrigerant circuit in which an outdoor unit including a compressor, a first indoor unit including an indoor heat exchanger, and a second indoor unit including an indoor heat exchanger are connected via refrigerant pipes, and a controller being a harmony machine,
The control unit performs a cleaning operation including cleaning the indoor heat exchanger by causing the indoor heat exchanger to function as an evaporator, and a cooling operation in which air conditioning is performed by causing the indoor heat exchanger to function as an evaporator. is executable and
The environmental conditions during the first period during which the first indoor unit is in the cleaning operation and the second indoor unit is in the cooling operation are such that the first indoor unit is in the cooling operation and the second indoor unit is in the an air conditioner in which the frequency of the compressor during the first period is higher than the frequency of the compressor during the second period when environmental conditions are the same during the second period during which the air conditioner is in the cooling operation. 2. The control unit sets the frequency of the compressor in the first period to a frequency at which the temperature of the indoor heat exchanger of the first indoor unit determined by the cooling capacity of the outdoor unit is equal to or lower than the dew point temperature. The air conditioner described in . The controller adjusts the frequency of the compressor in the first period to the indoor frequency of the first indoor unit determined from the cooling capacity of the outdoor unit and the air volume blown out from the first indoor unit and the second indoor unit. 2. The air conditioner according to claim 1, wherein the frequency is such that the temperature of the heat exchanger is equal to or lower than the dew point temperature. The control unit determines the frequency of the compressor in the first period so that a predetermined amount of condensation or frost is obtained in the first indoor unit within a predetermined period of time from the start of the cleaning operation. 4. The air conditioner according to any one of 1 to 3. 5. The controller according to any one of claims 1 to 4, wherein the controller controls the first indoor unit such that the amount of air blown out from the second indoor unit during the first period is less than the amount of air blown by the user. 1. The air conditioner according to 1. The refrigerant circuit includes a first on-off valve capable of blocking the flow of refrigerant from the outdoor unit to the first indoor unit during the cleaning operation and the cooling operation, and the first on-off valve during the cleaning operation and the cooling operation. connected to a second on-off valve capable of blocking the flow of refrigerant from the outdoor unit to the second indoor unit;
The control unit sets the threshold temperature of the indoor temperature at which the second on-off valve is in the closed state from the open state in the first period to the threshold temperature when the cleaning operation is not performed in the first indoor unit. The air conditioner according to any one of claims 1 to 5, wherein the air conditioner is higher than. The control unit sets the execution period of the cleaning operation when the cooling operation is performed in the second indoor unit during the cleaning operation of the first indoor unit to during the cleaning operation of the first indoor unit. The air conditioner according to any one of claims 1 to 6, wherein the execution period of the cleaning operation is longer than when the second indoor unit is currently out of operation. When the control unit determines that the temperature of the indoor heat exchanger of the first indoor unit is higher than the dew point temperature during the first period, the control unit blows off from the second indoor unit within the first period. The air conditioner according to any one of claims 1 to 7, wherein the first indoor unit is controlled such that the amount of air supplied is smaller than the amount of air supplied by the user. The controller determines that the temperature of the indoor heat exchanger of the first indoor unit is equal to or lower than the dew point temperature during the first period, and the amount of air blown out from the second indoor unit within the first period. 8. The air conditioner according to any one of claims 1 to 7, wherein the first indoor unit is controlled such that the air volume is smaller than the air volume instructed by the user. The refrigerant circuit includes a first on-off valve capable of blocking the flow of refrigerant from the outdoor unit to the first indoor unit during the cleaning operation and the cooling operation, and the first on-off valve during the cleaning operation and the cooling operation. connected to a second on-off valve capable of blocking the flow of refrigerant from the outdoor unit to the second indoor unit;
When the control unit determines that the temperature of the indoor heat exchanger of the first indoor unit is higher than the dew point temperature during the first period, the second on-off valve is opened during the first period. 10. The air according to any one of claims 1 to 9, wherein the threshold temperature of the indoor temperature from which the closed state is to be higher than the threshold temperature when the cleaning operation is not performed in the first indoor unit. harmony machine. The refrigerant circuit includes a first on-off valve capable of blocking the flow of refrigerant from the outdoor unit to the first indoor unit during the cleaning operation and the cooling operation, and the first on-off valve during the cleaning operation and the cooling operation. connected to a second on-off valve capable of blocking the flow of refrigerant from the outdoor unit to the second indoor unit;
When the control unit determines that the temperature of the indoor heat exchanger of the first indoor unit is equal to or lower than the dew point temperature during the first period, the second on-off valve is changed from the open state to the closed state during the first period. 10. The air conditioner according to any one of claims 1 to 9, wherein the threshold temperature of the indoor temperature that becomes higher than the threshold temperature when the cleaning operation is not performed in the first indoor unit. When the control unit determines that the temperature of the indoor heat exchanger of the first indoor unit is equal to or lower than the dew point temperature during the first period, at least part of the cleaning operation of the first indoor unit is performed in the first period. The execution period of the cleaning operation when performed within one period is longer than the execution period of the cleaning operation when the second indoor unit is out of operation during the cleaning operation of the first indoor unit. The air conditioner according to any one of claims 1 to 11, which is elongated. When the controller determines that a predetermined amount of condensation or frost cannot be obtained within a predetermined period of time during the cleaning operation, the amount of air blown out from the second indoor unit within the first period is The air conditioner according to any one of claims 1 to 12, wherein the first indoor unit is controlled so that the air volume is less than the air volume instructed by the user. The refrigerant circuit includes a first on-off valve capable of blocking the flow of refrigerant from the outdoor unit to the first indoor unit during the cleaning operation and the cooling operation, and the first on-off valve during the cleaning operation and the cooling operation. connected to a second on-off valve capable of blocking the flow of refrigerant from the outdoor unit to the second indoor unit;
The control unit closes the second on-off valve from the open state during the first period when it is determined that a predetermined amount of condensation or frost cannot be obtained within a predetermined period of time during the cleaning operation. The air conditioner according to any one of claims 1 to 13, wherein the threshold temperature of the room temperature is higher than the threshold temperature when the cleaning operation is not performed in the first indoor unit. When the controller determines that a predetermined amount of condensation or frost cannot be obtained within a predetermined period of time during the cleaning operation, at least part of the cleaning operation of the first indoor unit is stopped during the first period. The execution period of the cleaning operation when the cleaning operation is performed during the cleaning operation is made longer than the execution period of the cleaning operation when the second indoor unit is out of operation during the cleaning operation of the first indoor unit. The air conditioner according to any one of claims 1 to 14. The control unit adjusts the execution period of the cleaning operation when it is determined that the temperature of the indoor heat exchanger of the first indoor unit is lower than a predetermined temperature lower than the dew point temperature in the first period. The air according to any one of claims 1 to 15, which is shorter than the execution period of the cleaning operation when it is determined that the temperature of the indoor heat exchanger of the first indoor unit is equal to or higher than the predetermined temperature in the period. harmony machine.

Images