JPH05141747A - Air conditioner - Google Patents

Abstract

PURPOSE:To prevent indoor air from becoming too cool during cooling operation and from becoming too warm during space heating operation, enable operation of indoor blowers to be continued during defrosting operation or during the stopping of operation of a compressor due to the malfunction of a freezing cycle, and perform indoor ventilation. CONSTITUTION:The subject air conditioner comprises a heat source device A and an indoor unit B, and a heating medium is so controlled as to be supplied to a heat exchanger 16 only in the case where temperatures detected by an outdoor air temperature detecting means 14 and by an indoor air temperature detecting means 17 meet certain preset requirements. Further, the indoor unit is constructed in such a way that the drive of blowers 10, 11 can be switched ON/OFF during defrosting operation or during the stopping of operation of a compressor 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner for ventilating indoor air and outdoor air, exchanging heat with each other, and cooling or heating the air introduced into the room with a heat exchanger. ..

[0002]

2. Description of the Related Art A block diagram of a conventional air conditioner is shown in FIG. In FIG. 8, A is a heat source unit and B is an indoor unit. The heat source unit A includes a compressor 1, a four-way switching valve 2, a heat source unit side heat exchanger 3, and an accumulator 4. Further, the duct connection ports 5, 6, 7, 8 are provided at both ends of the indoor unit B, respectively.
The duct connection ports 5 and 6 are connected to the room, and the duct connection ports 7 and 8 are connected to the outside by a duct.
Reference numeral 9 is a total heat exchanger that exchanges heat between indoor air and outdoor air with sensible heat and latent heat, 10 is a blower that sucks outdoor air, 11 is a blower that sucks indoor air, and 12 is ventilation of introduced outdoor air Reference numeral 13 is a ventilation passage for exhausted indoor air, and 14 is an outdoor air temperature detecting device provided on the suction side of the ventilation passage 12 for the introduced outdoor air. Further, an indoor heat exchanger 16 is provided near the expansion device 15 and the indoor outlet of the outdoor air ventilation passage, and is connected to the heat source device A to form a refrigeration cycle (heat pump cycle). Note that in FIG. 8, when the refrigerant flows in the direction of the solid line, the cooling operation is performed, and when the refrigerant flows in the direction of the broken line, the heating operation is performed. The chain line shows the flow of the indoor air discharged.

In such an air conditioner, during the cooling operation, the high temperature and high pressure refrigerant discharged from the compressor 1 is sent to the heat source unit side heat exchanger 3 via the four-way switching valve 2.
After exchanging heat with air and being liquefied here, the pressure is reduced by the expansion device 15 and sent to the indoor heat exchanger 16. Here, the refrigerant exchanges heat with the outdoor air that has exchanged heat with the indoor air in the total heat exchanger 9 sucked from the duct connection port 8 in the blower 10, and is vaporized again. The vaporized refrigerant is sucked into the compressor 1 after passing through the four-way switching valve 2 and the accumulator 4. During such a cooling operation, if the outdoor air temperature detected by the outdoor air temperature detection device 14 is higher than the preset temperature, the cooling operation is continued, and the detected temperature is the preset temperature. When it is lower, the operation of the compressor 1 is controlled to be stopped, the indoor air is ventilated, and the outdoor air is cooled and introduced into the room.

Further, in the heating operation, the high-temperature and high-pressure refrigerant discharged from the compressor 1 is sent to the indoor heat exchanger 16 through the four-way switching valve 2 and sucked from the duct connection port 8 by the blower 10 to be completely sucked. The heat exchanger 9 exchanges heat with the outdoor air that has exchanged heat with the indoor air, and is liquefied here. Next, the liquefied refrigerant is decompressed by the expansion device 15, and then exchanges heat with air in the heat source unit side heat exchanger 3 to be vaporized again. The vaporized refrigerant, after passing through the four-way switching valve 2 and the accumulator 4,
It is sucked into the compressor 1. During such a heating operation, if the outdoor air temperature detected by the outdoor air temperature detecting device 14 is lower than a preset temperature, the heating operation is continued, and the detected temperature is the preset detected temperature. When it is higher, the operation of the compressor 1 is controlled to be stopped, the indoor air is ventilated, and the outdoor air is heated and introduced into the room.

Further, in the defrosting operation, the high-temperature and high-pressure refrigerant discharged from the compressor 1 is sent to the heat source unit side heat exchanger 3 via the four-way switching valve 2 and the frost adhering to the surface of the heat exchanger. After being heat-exchanged with the liquefied liquid, the liquid is liquefied, and then sent to the indoor heat exchanger 16 through the expansion device 15. Here, the refrigerant exchanges heat with air and is vaporized again. The vaporized refrigerant is sucked into the compressor 1 after passing through the four-way switching valve 2 and the accumulator 4.

During the defrosting operation, the indoor blowers 10, 1
In No. 1, since the operation is stopped, it is possible to prevent the unwarmed air from blowing out into the room. Further, even if the compressor 1 is suddenly stopped during operation, for example, due to an excessive increase in discharge pressure, that is, if it is abnormally stopped, the indoor blowers 10 and 11 are not in operation. It is possible to prevent unheated air from blowing into the room, and to prevent unheated air from blowing into the room during the heating operation.

[0007]

According to the conventional air conditioner, the outdoor air temperature is higher than the preset temperature even when the indoor air temperature reaches an appropriate temperature by cooling the room during the cooling operation. In this case, the air conditioner continues to perform cooling operation, which causes a problem that the room is too cold.

Further, during the heating operation, even when the room is heated and the indoor air temperature reaches the proper temperature, the air conditioner continues the heating operation when the outdoor air temperature is lower than the preset temperature. There was a problem that the room was too warm.

Further, since the indoor blower is stopped during the defrosting operation, it is impossible to introduce outdoor air, and even if it is desired to ventilate the room, the room cannot be ventilated. There was a problem. In addition, even if the compressor stops operating due to an excessive increase in discharge pressure during the refrigeration cycle operation, the indoor air blower will stop operating and it will not be possible to introduce outdoor air. However, there was a problem that the room could not be ventilated even if the priority was to be given.

An object of the present invention is to provide an air conditioner capable of preventing the room air from being overcooled during the cooling operation and preventing the room air from being overheated during the heating operation.

Another object of the present invention is to provide an air conditioner which can keep the indoor blower operating and can ventilate the room during defrosting operation or when the compressor is stopped due to an abnormality in the refrigeration cycle.

[0012]

An air conditioner according to any one of claims 1 to 3 is a total heat exchanger for exchanging heat between indoor air and outdoor air, a blower for sucking indoor air and outdoor air, respectively. A heat exchanger installed in the ventilation path of the outdoor air that has been heat-exchanged by the heat exchanger, and exchanging heat between the outdoor air and the heat medium,
A refrigeration cycle is formed by an indoor unit consisting of an indoor air temperature detection device installed on the suction side of the indoor air ventilation passage and an outdoor air temperature detection device installed on the suction side of the outdoor air ventilation passage, and a heat exchanger. And a control means for supplying the heat medium to the heat exchanger only when both the detected temperatures detected by the indoor air temperature detecting device and the outdoor air temperature detecting device satisfy the temperature conditions set respectively. It is a thing.

The refrigerating cycle constitutes a cooling cycle, and the control means limits the heat exchanger only when the detected temperatures detected by the indoor air temperature detecting device and the outdoor air temperature detecting device are both above a predetermined temperature. The heat medium is supplied to.

Further, the refrigerating cycle constitutes a heating cycle, and the control means carries out heat exchange only when the respective detected temperatures detected by the indoor air temperature detecting device and the outdoor air temperature detecting device are both below a predetermined temperature. The heat medium is supplied to the container.

In the air conditioner of the fourth and fifth aspects, the total heat exchanger for exchanging heat between the indoor air and the outdoor air, the blower for sucking the indoor air and the outdoor air, and the total heat exchanger for exchanging heat. A heat exchanger installed in the outdoor air ventilation path to exchange heat between the outdoor air and the heat medium; an indoor air temperature detection device installed on the suction side of the indoor air ventilation path; and an outdoor air ventilation path suctioned. The indoor unit consisting of the outdoor air temperature detection device installed on the side, a heat source unit that forms a refrigeration cycle with a heat exchanger, and a switch that can turn on and off the drive of the blower during defrosting operation or compressor operation stop And a device.

[0016]

According to the air conditioner of the present invention, the outdoor air temperature detecting device is provided in the air passage for the sucked outdoor air, and the indoor air temperature detecting device is provided in the air passage for the sucked indoor air. Due to the provision of the
Even if the outdoor air temperature is higher than the preset temperature,
When the indoor air reaches the proper temperature, the operation of the compressor is stopped, and during the heating operation, even when the outdoor air temperature is lower than the preset temperature, the operation of the compressor is performed when the indoor air reaches the proper temperature. Can be stopped.

According to the air conditioner of claims 4 and 5, the switching device is provided so that the indoor blower can continue the operation during the defrosting operation or when the compressor is stopped due to an abnormality in the refrigeration cycle. In a room where it is necessary to give priority to ventilation, fresh outdoor air is always introduced into the room, and the air conditioner can be operated while ventilating the room.

[0018]

【Example】

Example 1. A first embodiment of the present invention is shown in FIGS. FIG. 1 is a configuration diagram of the air conditioner of this embodiment, and the same parts as those in the example of FIG. 8 are designated by the same reference numerals and the description thereof will be omitted.

In FIG. 1, 17 is a ventilation path 1 for indoor air.
3 is an indoor air temperature detecting device attached to the suction side of No. 3; Further, in FIG. 1, when the refrigerant flows in the direction of the solid line, the cooling operation is performed, and when the refrigerant flows in the direction of the broken line, the heating operation is performed. The alternate long and two short dashes line shows the flow of exhausted indoor air.

In such an air conditioner, during the cooling operation, the high temperature and high pressure refrigerant discharged from the compressor 1 is sent to the heat source unit side heat exchanger 3 via the four-way switching valve 2.
After exchanging heat with air and being liquefied here, the pressure is reduced by the expansion device 15 and sent to the indoor heat exchanger 16. Here, the refrigerant exchanges heat with the outdoor air that has been sucked from the duct connection port 8 in the blower 10 and has exchanged heat with the indoor air in the total heat exchanger 9,
It is vaporized again. The vaporized refrigerant is sucked into the compressor 1 after passing through the four-way switching valve 2 and the accumulator 4.
During such a cooling operation, the outdoor air temperature detected by the outdoor air temperature detection device 14 is higher than the preset first preset temperature, and the indoor air temperature detected by the indoor air temperature detection device 17 is When the temperature is higher than the preset second preset temperature, the cooling operation is continued, and conversely, the outdoor air temperature detected by the outdoor air temperature detecting device 14 is lower than the preset first preset temperature, or indoors. The indoor air temperature detected by the air temperature detecting device 17 is the preset second
When the temperature is lower than the set temperature, the control means (not shown) controls to stop the operation of the compressor 1.

Further, in the heating operation, the high-temperature and high-pressure refrigerant discharged from the compressor 1 is sent to the indoor heat exchanger 16 through the four-way switching valve 2 and sucked from the duct connection port 8 by the blower 10 to be completely sucked. The heat exchanger 9 exchanges heat with the outdoor air that has exchanged heat with the indoor air, and is liquefied here. Next, the liquefied refrigerant is decompressed by the expansion device 15, and then exchanges heat with air in the heat source unit side heat exchanger 3 to be vaporized again. The vaporized refrigerant, after passing through the four-way switching valve 2 and the accumulator 4,
It is sucked into the compressor 1. During such heating operation, the outdoor air temperature detected by the outdoor air temperature detecting device 14 is lower than the third preset temperature set in advance, and the indoor air temperature detected by the indoor air temperature detecting device 17 is When the temperature is lower than the preset fourth preset temperature, the heating operation is continued, and on the contrary, the outdoor air temperature detected by the outdoor air temperature detection device 14 is higher than the preset third preset temperature, or indoors. Control means (not shown) for stopping the operation of the compressor 1 when the room air temperature detected by the air temperature detecting device 17 is higher than a preset fourth set temperature.
Control with.

Next, a method of controlling the operation and stop of the compressor 1 during the cooling operation and the heating operation will be described. Figure 2
FIG. 3 is a block diagram showing a control mechanism for operating and stopping the compressor 1, and 18 is a control means composed of a heat source device control device.

FIG. 3 is a flowchart of the operation of the control means during the cooling operation. In step 19, it is determined whether the temperature detected by the outdoor air temperature detection device 14 is higher or higher than the first set temperature. If it is higher, the process proceeds to step 20, and if it is not higher, the process proceeds to step 21.
In step 20, it is determined whether the temperature detected by the indoor air temperature detecting device 17 is higher or higher than the second set temperature. If it is higher, the process proceeds to step 22, and if it is not higher, the process proceeds to step 21. In step 21, it is determined whether or not the compressor 1 is operating. If it is operating, the process proceeds to step 23, and if it is not operating, the process proceeds to step 24. In step 24, the operation state is not changed and the process returns to step 19. In step 23, the operation of the compressor 1 is stopped and the process returns to step 19. In step 22, it is determined whether the compressor 1 is in operation or not. If it is in operation, the process proceeds to step 25, and if it is not in operation, the process proceeds to step 26.
In step 26, the operation of the compressor 1 is started and the process returns to step 19. In step 25, the operation state is not changed and the process returns to step 19. The cooling operation is controlled as described above.

Next, FIG. 4 shows a flowchart of the operation of the control means during the heating operation. In step 27, the temperature detected by the outdoor air temperature detection device 14 is the third temperature.
It is determined whether the temperature is lower or lower than the set temperature. If the temperature is lower than the set temperature, the process proceeds to step 28. If not lower, the process proceeds to step 29. In step 28, it is determined whether the temperature detected by the indoor air temperature detecting device 17 is lower or lower than the fourth set temperature, and if it is lower, the process proceeds to step 30, and if it is not lower, the process proceeds to step 29. In step 29, it is determined whether or not the compressor 1 is operating. If it is operating, the process proceeds to step 31, and if it is not operating, the process proceeds to step 32. In step 32, the operation state is not changed and the process returns to step 27. Step 3
In 1, the operation of the compressor 1 is stopped and the process returns to step 27. In step 30, it is determined whether the compressor 1 is in operation or not. If it is in operation, the process proceeds to step 33, and if it is not in operation, the process proceeds to step 34. In step 34, the operation of the compressor 1 is started and the process returns to step 27. In step 33, the operation state is not changed and the process returns to step 27. The heating operation is controlled as described above.

According to the air conditioner thus constructed, the outdoor air temperature detected by the outdoor air temperature detecting device 14 is higher than the preset first set temperature and the indoor air temperature during the cooling operation. When the indoor air temperature detected by the detection device 17 is higher than the preset second set temperature, the cooling operation is continued, and conversely, the outdoor air temperature detection device 1
When the outdoor air temperature detected in 4 is lower than the preset first preset temperature, or the indoor air temperature detected by the indoor air temperature detection device 17 is lower than the preset second preset temperature Control is performed so that the operation of the compressor 1 is stopped. Therefore, when the room is cooled and the room air temperature reaches an appropriate temperature, the room air temperature detection device 17
In this way, it is possible to eliminate the problem that the room is too cold by ventilating by introducing the outdoor air while always maintaining the indoor air temperature at an appropriate temperature.

Further, even during the heating operation, the outdoor air temperature detected by the outdoor air temperature detecting device 14 is lower than the preset third set temperature and the indoor air temperature detected by the indoor air temperature detecting device 17. The preset temperature is the fourth
If the temperature is lower than the set temperature of, the heating operation is continued, and on the contrary, the outdoor air temperature detected by the outdoor air temperature detection device 14 is higher than the preset third set temperature, or detected by the indoor air temperature detection device 17. When the indoor air temperature thus set is higher than the preset fourth set temperature, the operation of the compressor 1 is controlled to be stopped. Therefore, when the room is heated and the indoor air temperature reaches the appropriate temperature, the indoor air temperature detection device 17 detects the temperature, and ventilation can be performed by introducing the outdoor air while always maintaining the indoor air temperature at the appropriate temperature. Can solve the problem of being too warm.

Although the refrigeration cycle has been described in the above embodiment, the same cooling or heating operation can be achieved by a device having a heat exchange action by water or another heat medium.

Example 2. The second embodiment of the present invention is shown in FIG.
7 to 7. FIG. 5 is a configuration diagram of the air conditioner of this embodiment, and the same portions as those in FIG. 1 are denoted by the same reference numerals and the description thereof will be omitted.

In FIG. 5, reference numeral 35 denotes an indoor blower operation switching device for controlling on / off of driving of the indoor blowers 10 and 11 during defrosting operation and when the operation of the compressor 1 is stopped due to an abnormality in the refrigeration cycle. Further, when the refrigerant flows in the direction of the solid line in FIG. 5, it is the cooling operation and the defrosting operation,
When the refrigerant flows in the direction of the broken line, the heating operation is performed, the one-dot chain line shown in the indoor unit B shows the flow of the outdoor air introduced, and the two-dot chain line shows the flow of the indoor air discharged. The operations of the cooling operation and the heating operation are the same as in the first embodiment.

In the defrosting operation, the high-temperature and high-pressure refrigerant discharged from the compressor 1 is sent to the heat source unit side heat exchanger 3 via the four-way switching valve 2 to exchange heat with the frost adhering to the surface of the heat exchanger. After being liquefied here, it passes through the expansion device 15 and is sent to the indoor heat exchanger 16. Here, the refrigerant exchanges heat with air and is vaporized again. The vaporized refrigerant passes through the four-way switching valve 2 and the accumulator 4 and is then sucked into the compressor 1.

Next, a method of controlling the operation of the indoor blower during the defrosting operation or when the operation of the compressor 1 is stopped due to an abnormality in the refrigeration cycle will be described. FIG. 6 shows an indoor blower 10,
It is a block diagram which shows the control mechanism of 11 operation | movement. Reference numeral 36 is a heat source device control device, and 37 is an indoor blower operation control device.

FIG. 7 is a flow chart showing the control contents of the indoor blowers 10 and 11. In step 38, it is determined whether the defrosting operation signal is output or not. If it is output, the process proceeds to step 39, and if it is not output, the process proceeds to step 40. In step 40, it is determined whether the compressor abnormal stop signal is output or not. If it is output, the process proceeds to step 39, and if it is not output, the process proceeds to step 41. In step 39, it is determined whether or not the operation signal is being output by the indoor blower operation switching device, and if it is being output, the procedure proceeds to step 42, and if it is not being output, the procedure proceeds to step 43. In step 42, an indoor blower operation signal is output and the process returns to step 38. In step 43, an operation stop signal of the indoor blower is output and the process returns to step 38. In step 41, step 3 is performed without changing the operating condition of the indoor blower.
Return to 8. As described above, the operation control of the indoor blower is performed during the defrosting operation and the abnormal compressor stop.

According to the air conditioner thus constructed, the indoor blower operation switching device is arranged to stop the indoor blowers 10 and 11 during the defrosting operation when the indoor unit is generally used in the room. By switching 35, it is possible to prevent the unwarmed air from blowing out into the room and prevent the indoor air temperature from decreasing. However, when the room where the indoor unit B is used is, for example, a room in which an undesired substance such as cigarette smoke or oil smoke is generated, it is necessary to prioritize the ventilation of the room.
By switching the indoor blower operation switching device 35 so as not to stop No. 1, it is possible to always introduce fresh outdoor air into the room.

Further, during the refrigeration cycle operation, even when the operation of the compressor 1 is stopped due to an excessive increase of the discharge pressure, the operation of the indoor blowers 10 and 11 is switched between the case where the operation is not stopped and the case where the operation is not stopped. It can be selected by the device 35, and when the indoor blowers 10 and 11 are stopped, the refrigerant is stopped from flowing to the indoor heat exchanger 16 due to the stop of the operation of the compressor 1 and is cooled during the cooling operation. It is possible to prevent the air that has not been heated from blowing into the room, and to prevent the air that has not been heated from blowing into the room during the heating operation. Also, the indoor blower 1
When 0 and 11 are not stopped, when the outdoor air temperature introduced during the heating operation is lower than the indoor air temperature, or when the outdoor air temperature introduced during the cooling operation is higher than the indoor air temperature, Since the indoor air to be exhausted by the total heat exchanger 9 and the outdoor air to be introduced are heat-exchanged, the outdoor air temperature can be relaxed and introduced into the room, and the indoor air temperature does not change suddenly. Can ventilate.

[0035]

According to the air conditioner of the present invention, an outdoor air temperature detecting device is provided in the air passage of the sucked outdoor air, and an indoor air temperature is provided in the air passage of the sucked indoor air. By installing the detection device, even when the outdoor air temperature is higher than the preset temperature during the cooling operation, the operation of the compressor is stopped when the indoor air reaches the appropriate temperature, and during the heating operation, the outdoor Even when the air temperature is lower than the preset temperature, the operation of the compressor can be stopped when the indoor air reaches the proper temperature. As a result, it is possible to prevent the room air from being overcooled during the cooling operation and the room air from being overheated during the heating operation.

According to the air conditioner of claims 4 and 5, the switching device is provided so that the indoor blower can continue to operate during defrosting operation or when the compressor is stopped due to an abnormality in the refrigeration cycle. In a room that needs to be ventilated preferentially, fresh outdoor air is always introduced into the room, and the air conditioner can be operated while ventilating the room.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an air conditioner according to a first embodiment of the present invention.

FIG. 2 is a block diagram showing a compressor control mechanism in the air conditioner of the first embodiment of the present invention.

FIG. 3 is a flow chart showing compressor control means during a cooling operation in the air conditioner of the first embodiment of the present invention.

FIG. 4 is a flowchart showing compressor control means during heating operation in the air conditioner of the first embodiment of the present invention.

FIG. 5 is a configuration diagram of an air conditioner of a second embodiment of the present invention.

FIG. 6 is a block diagram showing a control mechanism of the indoor blower during a defrosting operation and a compressor abnormal stop in the air conditioner of the second embodiment of the present invention.

FIG. 7 is a flowchart showing the control contents of the indoor blower during defrosting operation and abnormal compressor stop in the air conditioner of the second embodiment of the present invention.

FIG. 8 is a configuration diagram of a conventional air conditioner.

[Explanation of symbols]

 A heat source unit B indoor unit 1 compressor 2 four-way switching valve 3 heat source unit side heat exchanger 9 total heat exchanger 10, 11 blower 14 outdoor air temperature detection device 16 indoor heat exchanger 17 indoor air temperature detection device 35 indoor blower Operation switching device

Claims (5)

[Claims] 1. A total heat exchanger for mutually exchanging heat between indoor air and outdoor air, a blower for sucking indoor air and outdoor air, and a ventilation path for outdoor air heat-exchanged by the total heat exchanger. A heat exchanger installed to exchange heat between the outdoor air and the heat medium, an indoor air temperature detection device installed on the suction side of the indoor air ventilation passage, and an outdoor air temperature installed on the suction side of the outdoor air ventilation passage. An indoor unit including a detection device, a heat source device that forms a refrigeration cycle with the heat exchanger, and the detection temperatures detected by the indoor air temperature detection device and the outdoor air temperature detection device are both set. An air conditioner comprising: control means for supplying a heat medium to the heat exchanger only when a temperature condition is satisfied. 2. Only when the refrigerating cycle constitutes a cooling cycle, and the control means detects temperatures detected by the indoor air temperature detecting device and the outdoor air temperature detecting device are both above a predetermined temperature. The air conditioner according to claim 1, wherein a heat medium is supplied to the heat exchanger. 3. The refrigerating cycle constitutes a heating cycle, and only when the control means detects both the indoor air temperature detecting device and the outdoor air temperature detecting device at temperatures below a predetermined temperature. The air conditioner according to claim 1, wherein a heat medium is supplied to the heat exchanger. 4. A total heat exchanger for exchanging heat between indoor air and outdoor air, a blower for sucking indoor air and outdoor air, and a ventilation path for outdoor air that has been heat-exchanged by the total heat exchanger. A heat exchanger installed to exchange heat between the outdoor air and the heat medium, an indoor air temperature detection device installed on the suction side of the indoor air ventilation passage, and an outdoor air temperature installed on the suction side of the outdoor air ventilation passage. An air conditioner comprising: an indoor unit including a detection device; a heat source device that forms a refrigeration cycle with the heat exchanger; and a switching device that can turn on and off the drive of the blower during a defrosting operation. 5. A total heat exchanger for mutually exchanging heat between indoor air and outdoor air, a blower for sucking indoor air and outdoor air, and a ventilation path for outdoor air heat-exchanged by said total heat exchanger. A heat exchanger installed to exchange heat between the outdoor air and the heat medium, an indoor air temperature detection device installed on the suction side of the indoor air ventilation passage, and an outdoor air temperature installed on the suction side of the outdoor air ventilation passage. An air conditioner comprising: an indoor unit including a detection device; a heat source device that forms a refrigeration cycle with the heat exchanger; and a switching device that can turn on and off the drive of the blower when the compressor is stopped.