WO2015129099A1

WO2015129099A1 - Air conditioner

Info

Publication number: WO2015129099A1
Application number: PCT/JP2014/078436
Authority: WO
Inventors: 遠藤　道子; 坪江　宏明
Original assignee: 日立アプライアンス株式会社
Priority date: 2014-02-25
Filing date: 2014-10-27
Publication date: 2015-09-03
Also published as: EP3112768A4; EP3112768B1; JP6177158B2; US20160348927A1; CN106133452B; EP3112768A1; JP2015158338A; CN106133452A

Abstract

An air conditioner able to avoid the risk of fire and able to have a reduced number of coolant leakage detectors while using a coolant having a low global warming potential (GWP) is obtained. The air conditioner is provided with a heat source (2) configured so as to use a combustible coolant having a low global warming potential, and configured by housing inside a case (2a) freeze cycle components such as a heat exchanger (22) in which the coolant flows, an electric part box (28) in which electric parts and the like are housed, and a blower (24) driven by a motor (24a). Also, in the case, airflow is formed by the blower, and the freeze cycle components in which the coolant flows are arranged in the airflow in the case, and the electric box and electric parts such as the motor of the blower are arranged upstream from the freeze cycle components in the airflow.

Description

Air conditioner

The present invention relates to an air conditioner, and more particularly to an air conditioner that uses a refrigerant having a low global warming potential GWP (Global Warming Potential).

Recently, from the viewpoint of preventing global warming, the use of a refrigerant having a low global warming potential GWP has been studied. In JP-A-11-37619 (Patent Document 1), a hydrocarbon-based natural refrigerant is used. An air conditioner was proposed. Further, this Patent Document 1 is provided with a refrigerant leakage detection means for detecting and outputting leakage of a flammable hydrocarbon-based natural refrigerant, and when refrigerant leakage is detected by the refrigerant leakage detection means, it is leaked by a fan or the like. The refrigerant is agitated and diffused to prevent the leaked refrigerant from staying and forming a combustible region.

Further, as a conventional air conditioner taking into consideration countermeasures against refrigerant leakage, there is one described in JP-A-2002-61996 (Patent Document 2). In this Patent Document 2, a gas detector that detects the leakage of refrigerant is provided in a room in which an indoor unit is installed. When the refrigerant leaks, an alarm device provided in the indoor unit issues an alarm, and the compressor and the outdoor fan The fan is operated, the outdoor expansion valve is closed, the four-way switching valve is set to the cooling operation side, the indoor expansion valve is opened, and the refrigerant is recovered to the outdoor unit.

Japanese Patent Laid-Open No. 2002-61996 Japanese Patent Laid-Open No. 11-37619

In the thing of the said patent document 1, although the hydrocarbon-type natural refrigerant | coolant is used as a refrigerant | coolant for air conditioners, global warming potential GWP becomes small, However, A hydrocarbon-type natural refrigerant | coolant is strong in combustibility, and air It is difficult to use as a refrigerant for a harmony machine.

In the above-mentioned Patent Document 2, consideration is not given to the use of a refrigerant having a low global warming potential GWP.

Recently, refrigerants such as HFO1234yf (GWP = 4) and HFO1234ze (GWP = 6) have attracted attention as refrigerants having a low global warming potential GWP. When these refrigerants such as HFO1234yf and HFO1234ze are used as the refrigerant of the air conditioner, there is a problem that these refrigerants HFO1234yf and HFO1234ze have a low density and a large volume when they are steam. For example, in comparison with the refrigerant R410A, the vapor specific volume assuming the suction part of the compressor is about 180% of R410A in the case of HFO1234yf and about 240% of R410A in the case of HFO1234ze. For this reason, the refrigerant | coolant pressure loss by the low pressure side of an air conditioner becomes large (for example, 3 times or more of R410A compared with the same conditions), and the subject that the power consumption of the compressor of an air conditioner becomes large occurs.

Further, R32 (GWP = 675) has been studied as a refrigerant having a relatively small global warming potential GWP.
However, these refrigerants (HFO1234yf, HFO1234ze, R32) are all flammable refrigerants (hereinafter referred to as slightly flammable refrigerants, which are weaker than hydrocarbon refrigerants) although they are weakly combustible. .

In the above-mentioned

Patent Documents

1 and 2, the refrigerant leakage is detected and countermeasures are taken when there is a refrigerant leakage, but the leakage of the flammable or slightly flammable refrigerant is detected to prevent the ignition thereof. In order to do so, it is necessary to provide refrigerant leakage detectors on both the outdoor unit side and the indoor unit side, which raises the problem of increased costs.

An object of the present invention is to obtain an air conditioner that can avoid the risk of ignition while using a refrigerant with a low global warming potential GWP and can also reduce the number of installed refrigerant leak detectors.

In order to achieve the above object, the present invention uses a flammable refrigerant with a low global warming potential, and houses refrigeration cycle element parts such as a heat exchanger in which the refrigerant flows, electrical parts, and the like in a casing. In an air conditioner including a heat source unit configured to accommodate an air blower driven by an electrical component box and a motor, the air flow is formed by the air blower in the housing, and The refrigeration cycle element part through which the refrigerant flows is installed in the air flow in the casing, and the electric parts such as the electric box and the motor of the blower are upstream from the refrigeration cycle element part in the air flow. It is arranged on the side.

According to the present invention, there is an effect that it is possible to obtain an air conditioner that can avoid the risk of ignition while using a refrigerant having a small global warming potential GWP and can also reduce the number of installed refrigerant leak detectors.

It is a schematic block diagram explaining Example 1 of the air conditioner of this invention. It is a refrigerating cycle block diagram of the air conditioner shown in FIG. It is a top view which shows the ceiling embedded type heat source machine in Example 1 of this invention. It is a perspective view explaining the example of the ceiling embedded type heat source machine as a conventional air conditioner. It is a top view explaining the flow of the air in the ceiling-embedded heat source machine shown in FIG.

Hereinafter, specific examples of the air conditioner of the present invention will be described with reference to the drawings. Note that, in each drawing, the portions denoted by the same reference numerals indicate the same or corresponding portions.

Embodiment 1 of an air conditioner of the present invention will be described with reference to FIGS. FIG. 1 is a schematic configuration diagram for explaining a first embodiment of an air conditioner of the present invention, FIG. 2 is a configuration diagram of a refrigeration cycle of the air conditioner shown in FIG. 1, and FIG. It is a top view which shows a heat source machine. For comparison, an example of a conventional air conditioner will be described with reference to FIGS.

In this embodiment, the flammable refrigerant is a slightly flammable refrigerant (for example, a flammable refrigerant having a combustion speed of 10 cm / s or less) that is less flammable than a hydrocarbon refrigerant such as propane or isobutane. An example of an air conditioner using HFO1234yf or HFO1234ze will be described. As described above, R32 is also included as a refrigerant having a relatively small global warming potential GWP. In this embodiment, an example in which HFO1234yf or HFO1234ze is used as the refrigerant will be described.

As described above, the refrigerants HFO1234yf and HFO1234ze have a low density and a large volume when they are steam, so that the refrigerant pressure loss on the low pressure side increases and the power consumption of the compressor of the air conditioner increases. was there. Therefore, in this embodiment, in order to reduce the refrigerant pressure loss on the low pressure side, the heat source unit is installed on the ceiling of the building so that the distance between the heat source unit and the indoor unit (that is, the length of the refrigerant pipe) can be shortened. This is a ceiling-embedded heat source device that is installed in a room or the like and performs heat exchange by introducing outdoor air. The specific configuration will be described below with reference to FIG.

FIG. 1 is a schematic configuration diagram illustrating an example of an installation state of the air conditioner of the present embodiment having a ceiling-embedded heat source device. In FIG. 1, reference numeral 1 denotes a building, and 2 denotes a housing that houses a refrigeration cycle element component such as a heat exchanger through which the refrigerant flows, an electrical component box containing electrical components, and a blower driven by a motor. In the present embodiment, the heat source machine configured as described above is a so-called ceiling-embedded heat source machine in which the heat source machine 2 is installed on the ceiling (back of the ceiling) 1 a in the building 1. 3 is an indoor unit that air-conditions the room 1b, and the indoor unit 3 and the heat source unit 2 are connected by refrigerant pipes 4 and 5 (4: gas side refrigerant pipe, 5: liquid side refrigerant pipe).

The heat source unit 2 sucks outdoor air as indicated by an arrow 6, and heat is exchanged between the outdoor air and the refrigerant in a heat exchanger provided in the heat source unit 2. As shown by 7, it is configured to blow out to the outside.

The indoor unit 3 sucks the air in the room 1b as indicated by an arrow 8, and heat is exchanged between the indoor air and the refrigerant in the heat exchanger provided in the indoor unit 3, and the cooled air ( By blowing out air (during cooling) or heated air (during heating) into the room as indicated by an arrow 9, the room 1b where the occupant 10 is present is air-conditioned.

In general, the heat source unit 2 is often installed as an outdoor unit on the roof of the building 1 or outside the wall of the building 1, but the ceiling part (distance from the indoor unit 3 is closer than the roof or the outdoor building) In the present embodiment, the refrigerant pipes 4 and 5 that connect the indoor unit 3 and the heat source unit 2 can be made shorter than the outdoor heat source unit by installing the ceiling unit 1a on the ceiling 1a as the ceiling embedded heat source unit 2. In this embodiment, the length of the refrigerant pipes 4 and 5 connecting the heat source unit 2 and the indoor unit 3 is set to 10 m or less, and thus the refrigerant pipes 4 and 5 can be shortened. Thus, the refrigerant pressure loss on the low pressure side of the compressor of the air conditioner can be reduced.

That is, the refrigerant HFO1234yf and HFO1234ze have low density and large volume when they are vapors, so that the refrigerant pressure loss on the low pressure side tends to increase. Since the refrigerant pressure loss can be reduced, the power consumption of the compressor can be reduced, and even when HFO1234yf or HFO1234ze, which are refrigerants having a low global warming potential, is used, an air conditioner with high efficiency can be obtained.

In the embodiment shown in FIG. 1, the heat source device 2 is described as being in a state of being in direct contact with the air outside the building 1. However, for the reason of shortening the distance from the indoor unit 3, etc. It is also possible to provide 2 in the building. In such a case, since the heat source unit 2 is not in direct contact with the air outside the building, the outside air may be configured to be introduced into the heat source unit 2 through an air duct. If comprised in this way, it will become possible to comprise easily so that the length of the refrigerant | coolant piping 4 and 5 which connect the said heat-source equipment 2 and the said indoor unit 3 may be 10 m or less, and HFO1234yf and HFO1234ze are used as a refrigerant | coolant. Even in this case, the refrigerant pressure loss on the low pressure side can be easily reduced.

FIG. 2 is a configuration diagram of the refrigeration cycle of the air conditioner shown in FIG. 2 is a heat source unit, and 3 is an indoor unit. The heat source unit 2 and the indoor unit 3 are connected by a gas side refrigerant pipe (gas side connection pipe) 4 and a liquid side refrigerant pipe (liquid side connection pipe) 5. .
In the heat source unit 2, a compressor 20, a four-way switching valve 21, a heat source-side heat exchanger 22, and an expansion device 23 are sequentially connected by a refrigerant pipe. Reference numeral 24 denotes an air blower for sucking outdoor air from the outdoor part of the building and blowing it out to the heat source side heat exchanger 22. The heat source side heat exchanger 22 exchanges heat between the sucked outdoor air and the refrigerant flowing through the refrigerant piping of the heat exchanger 22, thereby condensing (cooling) or evaporating (heating) the refrigerant.

The indoor unit 3 is configured by connecting an indoor heat exchanger 30 and an expansion device 31 with a refrigerant pipe. 32 is an air blower for sucking indoor air and blowing it out to the indoor heat exchanger 30. In the indoor heat exchanger 30, heat exchange is performed between the sucked indoor air and the refrigerant flowing in the refrigerant pipe of the heat exchanger 30, and the refrigerant is evaporated (during cooling) or condensed (during heating), The room can be air-conditioned by supplying cold air or hot air into the room.

In the present embodiment, a refrigerant leak detector (refrigerant leak detection means) 33 is installed in the indoor unit 3 so that when a refrigerant leak occurs in the indoor unit 3, this can be detected immediately. The refrigerant leakage detector 33 may be installed outside the indoor unit 3 or in a room where the indoor unit 3 is installed.

The heat source unit 2 and the indoor unit 3 are connected to each other by a gas side refrigerant pipe 4 and a liquid side refrigerant pipe 5. The gas side refrigerant pipe 4 includes a gas side blocking valve 25, and the liquid side refrigerant pipe 5 includes A liquid side blocking valve 26 is provided. Usually, these

stop valves

25 and 26 are provided on the heat source unit 2 side.
The arrow A in the heat source device 2 indicates the flow of the refrigerant during the heating operation, and the arrow B indicates the flow of the refrigerant during the cooling operation.

Next, the configuration of the heat source unit 2 will be described with reference to FIG. 3, but before that, the configuration of a conventional ceiling-embedded heat source unit will be described with reference to FIGS. 4 and 5 for comparison.
4 is a perspective view for explaining an example of a ceiling-embedded heat source device as a conventional air conditioner, and FIG. 5 is a plan view for explaining the flow of air in the ceiling-embedded heat source device shown in FIG. is there.

In FIG. 4, 2 is a conventional ceiling-embedded heat source device corresponding to the ceiling-embedded heat source device 2 shown in FIG. Reference numeral 2a denotes a housing, and the inside of the housing 2a is divided into an upstream space 2c and a downstream space 2d by a partition plate 2b. 2e is an air inlet for introducing outdoor air (outside air) into the

upstream space

2c, and 2f is an air outlet for blowing out the heat exchanged from the downstream space 2d to the outside of the building.

A heat exchanger (heat source side heat exchanger) 22 for exchanging heat between the refrigerant flowing in the heat transfer tube and the outdoor air introduced from the air suction port 2e is sucked into the upstream space 2c. Thus, there are a blower 24 for supplying outdoor air to the heat exchanger 22, a compressor 20 for compressing the refrigerant, a liquid receiver 27 for storing excess refrigerant condensed in the heat exchanger 22, and the like. Contained. Reference numeral 24a denotes a motor for driving the blower 24.

On the other hand, the downstream space 2d accommodates an electrical component box 28 that houses electrical components such as a control board on which electronic components are mounted and a terminal block.
In the conventional heat source device 2, R407C, R410A, or the like is used as the refrigerant. Moreover, in FIG. 4, the compressor 20, the heat exchanger 22, and the liquid receiver 27 are refrigeration cycle element components through which a refrigerant flows. Although not shown in FIG. 4, the four-way switching valve 21 and the expansion device 23 as shown in FIG. 2 are also refrigeration cycle component parts through which refrigerant flows.

Next, the flow of air in the conventional ceiling-embedded heat source machine shown in FIG. 4 will be described with reference to FIG. In FIG. 5, an arrow C is an air flow in the housing 2 a of the heat source device 2.
In the conventional ceiling-embedded heat source device 2, refrigeration cycle elements such as the compressor 20, the heat exchanger 22, and the liquid receiver 27 are disposed upstream of the air flow C formed by the blower 24. Components are installed, and the air blower 24 and the electrical component box 28 are installed downstream of the air flow C. For this reason, when the refrigerant leaks from any of these refrigeration cycle component parts, the leaked refrigerant flows along the air flow C.

However, when a refrigerant such as HFO1234yf or HFO1234ze having a small global warming potential GWP or a refrigerant such as R32 having a relatively small GWP is employed as the refrigerant, these refrigerants are slightly flammable. It rides on the air flow C and comes into contact with the motor 24a of the blower 24 and the electrical component box 28. Since electrical parts are housed in the electrical component box 28, it has been found that there is a risk of combustion if combustible refrigerant is present around the electrical parts when heat generation or current leakage occurs. The same applies to the motor 24a of the blower 24.

Therefore, in this embodiment, the equipment arrangement inside the ceiling-embedded heat source unit 2 is configured as shown in FIG. In the ceiling-embedded heat source unit shown in FIG. 3, the same reference numerals are given to the components corresponding to those in the conventional ceiling-embedded heat source unit shown in FIGS. Only will be described.

In the ceiling-embedded heat source unit 2 of the present embodiment, when the air blower 24 is operated, the outdoor air suction air flow indicated by the white arrow 6 flows into the housing 2a from the air suction port 2e, and the air As shown by the flow C, the air flows in the housing 2a, is blown out from the air outlet 2f, and is discharged outside the building.

In the present embodiment, the refrigeration cycle element parts through which refrigerant such as the compressor 20, the heat exchanger 22 and the liquid receiver 27 flow are arranged in the downstream space 2d in the housing 2a, and the blower 24 and the electrical component box 28 are It arrange | positions in the upstream space 2c in the housing | casing 2a.

With this configuration, the refrigeration cycle component is located downstream in the air flow, and the electrical component box 28 and the blower 24 are installed upstream of the refrigeration cycle component. Therefore, even if a refrigerant leak occurs from any of the refrigeration cycle element parts, the leaked refrigerant does not contact the electrical component box 28 or the air blower 24 and flows into the air flow C. It can be ridden outside the building.
Therefore, even if a slightly flammable or combustible refrigerant leaks from the refrigeration cycle element parts, the refrigerant can become an ignition source, such as the electric parts in the electric component box 28 and the motor 24a of the blower 24. Contact with parts can be prevented, and fear of combustion can be avoided.

More detailed explanation. In this embodiment, HFO1234yf, HFO1234ze, etc., which are slightly flammable refrigerants, are used, and the heat source machine is a ceiling-embedded heat source machine. In other words, there is a risk of combustion in the heat source unit, and if refrigerant leaks outside the heat source unit, there is a risk that the refrigerant will flow out into the building, such as the back of the ceiling. There is a risk that the room will run out of oxygen. In this embodiment, the electrical component box 28 and the air blower 24 are installed upstream of the refrigeration cycle element component in order to deal with such problems. Even if refrigerant leakage occurs, the leaked refrigerant can be discharged to the outside of the building without being brought into contact with the electrical component box 28 or the blower 24, and combustion or oxygen deficiency due to refrigerant leakage from the ceiling-embedded heat source machine The effect which can prevent is acquired.

In addition, with respect to refrigerant leakage from the indoor unit, since the indoor unit includes the refrigerant leakage detector 33, it is possible to avoid fear of occurrence of combustion in the room and prevention of oxygen deficiency. That is, in this embodiment, as shown in FIG. 2, since the refrigerant detector 33 is provided in the indoor unit 3, if refrigerant leakage occurs on the indoor unit 3 side, this is detected by the refrigerant detector. It is possible to prevent the occurrence of combustion and oxygen deficiency due to accumulation of the slightly flammable refrigerant in the indoor unit 3 or the indoor 1b by issuing an alarm or the like.

In addition, although the refrigerant detector is expensive, in the present embodiment, the refrigerant leak detector is arranged on the heat source machine side because the refrigerant leak detector from the heat source machine side is configured to prevent combustion and oxygen deficiency. There is no need to provide it. Therefore, the number of expensive refrigerant detectors installed can be reduced, and an inexpensive air conditioner can be obtained accordingly. That is, in the present embodiment, the heat source device 2 has the configuration described with reference to FIG. 3, and therefore, it is not necessary to install the refrigerant detector on the heat source device 2 side, so the number of expensive refrigerant detectors installed can be reduced. Therefore, an inexpensive air conditioner can be realized while suppressing cost increase.

Furthermore, in this embodiment, HFO1234yf and HFO1234ze, which are refrigerants with a low global warming potential GWP, are used as refrigerants for the air conditioner, so that the refrigerant pressure loss on the low pressure side of the air conditioner tends to increase. There are challenges. Against this problem, since the heat source unit 2 is a ceiling-embedded heat source unit in this embodiment, the length of the refrigerant pipe connecting the indoor unit and the heat source unit is short, for example, 10 m or less. it can. Therefore, it is possible to reduce the refrigerant pressure loss on the low pressure side of the air conditioner while using the refrigerant such as HFO1234yf and HFO1234ze whose density is low and the volume is large when it is steam, and as a result, power consumption is also reduced. An efficient air conditioner that can be obtained can be obtained.

In this embodiment, the air blower 24 of the ceiling-embedded heat source unit 2 is configured to be driven periodically even when the air conditioner is not operating. In other words, even when the air conditioner is stopped, the air blower 24 is rotated periodically by using a timer or the like, for example, once to several times a day, several seconds to several minutes, and thus the heat source machine. The air flow C is generated in the second housing 2a. As a result, even if a refrigerant leak occurs while the air conditioner is stopped, the leaked refrigerant can be periodically discharged outside the building, so that the leaked refrigerant gradually accumulates in the housing 2a and there is a risk of combustion. The increase can be avoided.

When the air blower is not operated periodically as in the present embodiment while the air conditioner is stopped, if refrigerant leakage occurs, a slightly flammable refrigerant stays in the heat source unit 2 and its concentration increases. , Increase the risk of ignition. In addition, if the refrigerant leaks from the heat source device 2 through the ceiling or the like and enters the room 1b (see FIG. 1) where the occupant 10 is present, there is a concern that combustion or oxygen deficiency may occur in the room.

On the other hand, in the present embodiment, as described above, since the blower 24 is periodically driven even when the air conditioner is stopped, the leaked refrigerant stays in the heat source unit 2 and the concentration thereof is reduced. Since it is possible to prevent the leaked refrigerant from entering the room 1b, it is possible to reliably avoid the occurrence of combustion and oxygen deficiency due to leakage of the slightly flammable refrigerant.

As described above, according to the present embodiment, the use of a slightly flammable refrigerant having a low global warming potential GWP can avoid the risk of ignition, and the number of installed refrigerant leak detectors can be reduced. Can be realized. In addition, since the refrigerant pressure loss on the low pressure side of the air conditioner can be reduced, an effect of obtaining an efficient air conditioner can be obtained.

In addition, this invention is not limited to an above-described Example, Various modifications are included. For example, in the above-described embodiment, the example of using the slightly-flammable HFO1234yf or HFO1234ze having a small global warming potential GWP as the refrigerant has been described. However, the refrigerant having a relatively small GWP and using the slightly-flammable R32 or the like The same applies to the case of using other refrigerants or mixed refrigerants having properties. In addition, the case where the heat source unit is a ceiling-embedded heat source unit has been described, but the heat source unit is not limited to the ceiling-embedded type, and the technical concept of the present invention is applicable to an outdoor unit installed outside a building. Are applicable as well.
Further, the above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described.

1: Building, 1a: Ceiling (back of ceiling), 1b: Indoor,
2: Ceiling embedded heat source machine, 2a: housing, 2b: partition plate,
2c: upstream space, 2d: downstream space,
2e: Air inlet, 2f: Air outlet,
3: Indoor unit
4: Gas side refrigerant piping, 5: Liquid side refrigerant piping,
6: Air flow into the heat source machine, 7: Air flow from the heat source machine,
8: Suction air flow of indoor unit, 9: Blowing air flow of indoor unit,
10: Attendees,
20: Compressor, 21: Four-way selector valve,
22: heat source side heat exchanger, 23: expansion device,
24: blower, 24a: motor,
25: Gas side blocking valve, 26: Liquid side blocking valve,
27: Liquid receiver, 28: Electrical box
30: Indoor heat exchanger, 31: Indoor expansion device,
32: Blower, 33: Refrigerant detector (refrigerant detection means),
A: Refrigerant flow during heating operation, B: Refrigerant flow during cooling operation.

Claims

A refrigeration cycle component such as a heat exchanger in which the refrigerant flows, an electrical component box containing electrical components, and a blower driven by a motor while using a flammable refrigerant with a low global warming potential In an air conditioner including a heat source unit configured to accommodate
The air flow is formed by the blower in the casing, and the refrigeration cycle element component through which the refrigerant flows is installed in the air flow in the casing, and the electrical component box and The air conditioner, wherein an electrical component such as a motor of the blower is disposed upstream of the refrigeration cycle element component in the air flow.
2. The air conditioner according to claim 1, wherein the refrigerant is a slightly flammable refrigerant that is less combustible than a hydrocarbon-based natural refrigerant.
3. The air conditioner according to claim 2, wherein the slightly flammable refrigerant is at least one of HFO1234yf, HFO1234ze, and R32.
The air conditioner according to claim 3, wherein the slightly flammable refrigerant is at least one of HFO1234yf and HFO1234ze, and the heat source unit is installed in a ceiling portion of a building and introduces outdoor air. An air conditioner that is a ceiling-embedded heat source that performs heat exchange.
5. The air conditioner according to claim 4, wherein the ceiling-embedded heat source unit is connected to an indoor unit that air-conditions a room by a refrigerant pipe, and a length of the refrigerant pipe that connects the heat source unit and the indoor unit. An air conditioner characterized in that the air conditioner is configured to be 10 m or less.
6. The air conditioner according to claim 5, further comprising a refrigerant leak detection means in the indoor unit or a room in which the indoor unit is installed.
The air conditioner according to any one of claims 1 to 6, wherein the air blower of the heat source unit is periodically driven even when the air conditioner is stopped. Harmony machine.