JP2016044903A - Air conditioner and air conditioning system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air conditioner in which a plurality of outdoor machines are connected to a single indoor machine, and which can easily detect erroneous connection or poor connection.SOLUTION: An air conditioner 1 in which a first outdoor machine 30a and a second outdoor machine 30b are connected to an indoor machine 10 has an inspection mode in which each of the outdoor machine 30a and the second machine 30b is operated individually to determine whether change in temperature of the indoor machine 10 within a predetermined time is a predetermined value or more.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an air conditioner and an air conditioning system.

  2. Description of the Related Art Conventionally, some air conditioners perform air conditioning in a relatively wide space such as a whole building air conditioning. Such an air conditioner is disclosed in Patent Document 1, for example.

  The conventional air conditioner described in Patent Document 1 uses a plurality of outdoor units in combination in order to perform air conditioning in a relatively wide space. Thereby, compared with the case of a single outdoor unit, higher air conditioning performance is obtained.

JP 2010-96432 A

  However, in the case of an air conditioner including a plurality of outdoor units and a plurality of refrigeration cycles, it is possible that the electrical wiring and the cycle piping are erroneously connected erroneously or connection failures thereof occur. If electrical wiring or cycle piping is misconnected, there is a high possibility that normal air conditioning operation cannot be realized. When the cooling cycle and the heating cycle are mixed and operated, the cooling and heating are reversed, and there is a possibility that the control cannot be performed.

  Moreover, when the abnormality is discovered regarding the outdoor unit in which the electrical wiring or the cycle piping is erroneously connected, there is a possibility that the normal outdoor unit is repaired. In addition, multiple outdoor units are often placed at the same location, and even if there is an incorrect connection in the electrical wiring or cycle piping, there is little trouble in performing air-conditioning operation. I did not.

  On the other hand, when operating a plurality of outdoor units, there is a problem in that power consumption increases when operating more than necessary number of outdoor units with respect to the required air-conditioning operation. Further, when any one of the plurality of outdoor units is selected to stop the operation, there is a problem that the cumulative operation time of the specific outdoor unit becomes extremely long and the life is extremely shortened.

  The present invention has been made in view of the above points, and in an air conditioner in which a plurality of outdoor units are connected to a single indoor unit, it is possible to easily detect misconnection or connection failure. The purpose is to provide a harmony machine. In addition, in an air conditioner in which a plurality of outdoor units are connected to a single indoor unit, an air conditioner and an air conditioning system in which power consumption is reduced and the lifetime of the outdoor unit is made uniform are provided. Objective.

  In order to solve the above-described problem, the present invention provides an air conditioner in which a plurality of outdoor units are connected to a single indoor unit, and the temperature of the indoor unit is determined by operating each of the plurality of outdoor units one by one. It is characterized by having an inspection mode for determining whether or not the change within a predetermined time is equal to or greater than a predetermined value.

  In the air conditioner having the above-described configuration, the indoor unit includes an operation unit for starting the inspection mode.

  Moreover, the air conditioner having the above-described configuration is characterized in that the indoor unit includes an informing unit for informing the determination result of the inspection mode.

  In the air conditioner configured as described above, when an erroneous connection between the indoor unit and the plurality of outdoor units is detected based on the determination result of the inspection mode, the plurality of outdoor units corresponding to the erroneous connection are detected. The command signal is switched and input.

  In the air conditioner having the above configuration, the indoor unit includes a notification unit for notifying the determination result of the inspection mode, and the indoor unit and the plurality of outdoor units are based on the determination result of the inspection mode. When erroneous connection is detected, notification of erroneous connection and replacement of command signals to the plurality of outdoor units corresponding to the erroneous connection can be selected.

  Further, in the air conditioner having the above-described configuration, when the outside air temperature is lower than a predetermined temperature, the predetermined value related to the temperature change width of the indoor unit in the inspection mode is lowered than usual.

  In the air conditioner having the above-described configuration, when the outside air temperature is lower than a predetermined temperature, the predetermined time for determining the temperature change of the indoor unit in the inspection mode is extended from normal.

  In the air conditioner having the above-described configuration, the minimum number of the outdoor units required for the air conditioning operation requested among the plurality of outdoor units is operated, and the operation of the remaining outdoor units is stopped. It is said.

  In the air conditioner having the above-described configuration, a storage unit that stores the accumulated operation time of each of the plurality of outdoor units is provided, and the operation is stopped in order from the outdoor unit having the longer accumulated operation time.

  Further, in the air conditioner having the above configuration, each of the plurality of outdoor units has the same cooling capacity, and uses an accumulated operation time of each of the outdoor units and an alternating current flowing through each of the outdoor units during operation. And storing the numerical information calculated in this manner, and the operation is stopped in order from the outdoor unit having the largest numerical information.

  Further, the present invention provides an air conditioning system including a plurality of air conditioner sets in which one or more outdoor units are connected to a single indoor unit, and the required air conditioning operation among the plurality of outdoor units. A minimum number of the outdoor units are operated, and the operation of the remaining outdoor units is stopped.

  According to the configuration of the present invention, in an air conditioner in which a plurality of outdoor units are connected to a single indoor unit, it is possible to provide an air conditioner that can easily detect misconnection or connection failure. it can. Moreover, in an air conditioner in which a plurality of outdoor units are connected to a single indoor unit, it is possible to provide an air conditioner and an air conditioning system in which power consumption is reduced and the lifetime of the outdoor unit is made uniform. it can.

It is a schematic block diagram of the air conditioner of 1st Embodiment of this invention. It is a block diagram which shows the structure of the air conditioner of 1st Embodiment of this invention. The schematic block diagram of the air conditioner of 1st Embodiment of this invention is shown, and the case where there exists a misconnection in cycle piping is shown. It is a flowchart which shows operation | movement of the inspection mode of the air conditioner of 1st Embodiment of this invention. It is a flowchart which shows operation | movement of the inspection mode of the air conditioner of 2nd Embodiment of this invention. It is a flowchart (continuation of FIG. 5) which shows operation | movement of the inspection mode of the air conditioner of 2nd Embodiment of this invention. It is a schematic block diagram of the air conditioner of 3rd Embodiment of this invention. It is a flowchart which shows operation | movement of the inspection mode of the air conditioner of 4th Embodiment of this invention. It is a flowchart which shows operation | movement of the inspection mode of the air conditioner of 5th Embodiment of this invention. It is a flowchart which shows the reduction process of the operating number of the outdoor unit of the air conditioner of 6th Embodiment of this invention. It is a flowchart which shows the reduction process of the operation number of the outdoor unit of the air conditioner of 7th Embodiment of this invention. It is a flowchart which shows the reduction process of the operating number of the outdoor unit of the air conditioner of 8th Embodiment of this invention. It is a schematic block diagram of the air conditioning system of 9th Embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS.

<First Embodiment>
Initially, the structure and operation | movement outline | summary are demonstrated about the air conditioner of 1st Embodiment of this invention using FIG.1 and FIG.2. FIG. 1 is a schematic configuration diagram of an air conditioner and shows a state during cooling operation. FIG. 2 is a block diagram showing the configuration of the air conditioner.

  As shown in FIGS. 1 and 2, the air conditioner 1 is a separate type air in which two outdoor units, a first outdoor unit 30 a and a second outdoor unit 30 b, are connected to one indoor unit 10. It is a harmony machine.

  The indoor unit 10 is installed, for example, in a ceiling part of a room and includes a housing 11 made of synthetic resin parts. The indoor unit 10 includes an indoor fan 12, a first indoor heat exchanger 13 a, a second indoor heat exchanger 13 b, an operation unit 14, a notification unit 15, and an indoor unit control unit 16 inside the housing 11.

  The indoor blower 12 is a combination of a fan and a motor that rotates the fan. The housing 11 is provided with an inlet and an outlet (each not shown). When the indoor blower 12 is driven, the indoor air sucked into the housing 11 from the room through the suction port flows in the direction reaching the outlet, and is blown out from the outlet toward the room.

  The 1st indoor heat exchanger 13a and the 2nd indoor heat exchanger 13b are arrange | positioned so that the fan of the indoor air blower 12 may be opposed, for example. When the indoor blower 12 is driven, the indoor air sucked into the housing 11 through the suction port passes through the first indoor heat exchanger 13a and the second indoor heat exchanger 13b, and the first indoor heat exchanger 13a. The second indoor heat exchanger 13b exchanges heat with the room air. In the description and drawings, the first indoor heat exchanger 13a and the second indoor heat exchanger 13b may be collectively referred to as an indoor heat exchanger 13 unless particularly limited to any one of them.

  In order to control the operation of the air conditioner 1, it is indispensable to know the temperature of each place. For this reason, temperature detectors are arranged at various locations in the indoor unit 10.

  The 1st heat exchanger temperature detector 17a is arrange | positioned at the 1st indoor heat exchanger 13a, and detects the temperature of the 1st indoor heat exchanger 13a. The first liquid pipe temperature detector 18a is disposed in the first liquid pipe 2a provided on the side where the refrigerant flows into the first indoor heat exchanger 13a during the cooling operation, and the temperature of the refrigerant flowing through the first liquid pipe 2a is determined. To detect. The 2nd heat exchanger temperature detector 17b is arrange | positioned at the 2nd indoor heat exchanger 13b, and detects the temperature of the 2nd indoor heat exchanger 13b. The second liquid pipe temperature detector 18b is disposed in the second liquid pipe 2b provided on the side where the refrigerant flows into the second indoor heat exchanger 13b during the cooling operation, and the temperature of the refrigerant flowing through the second liquid pipe 2b is determined. To detect. The indoor temperature detector 19 is disposed at a location close to the indoor side of the housing 11 and detects the indoor temperature. The first heat exchanger temperature detector 17a, the first liquid pipe temperature detector 18a, the second heat exchanger temperature detector 17b, the second liquid pipe temperature detector 18b, and the indoor temperature detector 19 are all configured by, for example, a thermistor. Is done.

  The operation unit 14 includes, for example, a remote control or an operation panel installed on a wall of the room. The operation panel 14 includes a display unit, an operation switching key, a temperature adjustment key, an air volume adjustment key, an air direction adjustment key, a timer key (each not shown), and the like. Further, the operation panel 14 includes an inspection key 20 described later.

  The alerting | reporting part 15 is provided in order to alert | report the driving | running state and abnormality of the air conditioner 1 with respect to a user. For example, the notification unit 15 displays information on the display unit of the operation panel 14, expresses a state with light from the light emitting member, and notifies information by voice.

  The indoor unit 10 houses the indoor unit control unit 16 inside the housing 11 in order to control the operation of the entire air conditioner 1 including the first outdoor unit 30a and the second outdoor unit 30b. The indoor unit control unit 16 includes a calculation unit (not shown) and the like, and a series of air that performs control so that the room temperature reaches a target value set by the user based on programs and data stored and input in the storage unit 21 and the like. Achieve harmonious operation.

  The indoor unit control unit 16 issues an operation command to the indoor blower 12 and a first outdoor unit control unit 38a and a second outdoor unit control unit 38b described later. The indoor unit controller 16 includes a first heat exchanger temperature detector 17a, a first liquid pipe temperature detector 18a, a second heat exchanger temperature detector 17b, a second liquid pipe temperature detector 18b, and an indoor temperature detector. The output signal concerning each detected temperature is received from 19. Further, the indoor unit control unit 16 receives various settings related to the operation of the air conditioner 1 from the user using the operation unit 14. In addition, the indoor unit control unit 16 notifies the user of the operating state and abnormality of the air conditioner 1 using the notification unit 15.

  Each of the first outdoor unit 30a and the second outdoor unit 30b is installed on, for example, an outdoor floor surface, and has a rectangular box-shaped casing 31a and a casing formed of synthetic resin parts and sheet metal parts. 31b. In the description and the drawings, the first outdoor unit 30a and the second outdoor unit 30b may be collectively referred to as the outdoor unit 30 unless it is particularly limited to any one of them. Further, since the first outdoor unit 30a and the second outdoor unit 30b have the same configuration, the following description will be made by omitting the symbols “a” and “b” indicating the respective components or related members. Sometimes.

  The outdoor unit 30 is connected to the indoor unit 10 using the liquid pipe 2 and the gas pipe 3. The outdoor unit 30 includes a compressor 32, a switching valve 33, an expansion valve 34, an outdoor blower 35, an outdoor heat exchanger 36, an outdoor temperature detector 37, and an outdoor unit control unit 38 inside the casing 31.

  The compressor 32 applies pressure to the refrigerant circulating in the refrigeration cycle. The switching valve 33 is a four-way valve for switching the refrigerant flow direction in different operation modes such as cooling operation and heating operation. As the expansion valve 34, a valve whose opening degree can be controlled is used.

  The outdoor blower 35 is a combination of a propeller fan provided adjacent to the inner wall of the housing 31 and a motor that rotates the propeller fan. The housing 31 is provided with a suction port and a blowout port (not shown). The outdoor heat exchanger 36 is disposed in the vicinity of the outdoor fan 35. When the outdoor blower 35 is driven, the outside air sucked into the housing 31 from the outside through the suction port passes through the outdoor heat exchanger 36, and heat exchange is performed between the outdoor heat exchanger 36 and the outside air. Is called.

  The outside air temperature detector 37 is disposed at a location close to the outside of the housing 31 and detects the outside air temperature. The outside temperature detector 37 is constituted by, for example, a thermistor.

  The outdoor unit 30 accommodates an outdoor unit control unit 38 inside the housing 31 in order to perform detailed operation control of the outdoor unit 30 itself. In response to the operation command from the indoor unit control unit 16, the outdoor unit control unit 38 issues an operation command to the compressor 32, the switching valve 33, the expansion valve 34, and the outdoor blower 35. The outdoor unit controller 38 receives an output signal related to the detected temperature from the outside air temperature detector 37. The outdoor unit control unit 38 includes a calculation unit, a storage unit, and the like (not shown), and is received from the indoor unit control unit 16 based on programs, data, and outside air temperature obtained from the outdoor temperature detector 37 stored and input in the storage unit. The outdoor unit 30 itself is controlled so as to follow the operation command.

  FIG. 1 shows a state in which the air conditioner 1 is performing a cooling operation or a defrosting operation. At this time, the compressor 32 circulates the refrigerant in a cooling mode, that is, in a circulation mode in which the refrigerant discharged from the compressor 32 first enters the outdoor heat exchanger 36. The refrigerant circulates in a direction indicated by an arrow with a broken line drawn close to the liquid pipe 2, the gas pipe 3 and the like in FIG.

  The high-temperature and high-pressure gaseous refrigerant discharged from the compressor 32 enters the outdoor heat exchanger 36, and heat exchange with the outside air is performed in the outdoor heat exchanger 36. The refrigerant dissipates heat to the outside air and condenses. The refrigerant that has condensed into a liquid reaches the expansion valve 34 from the outdoor heat exchanger 36 and is decompressed.

  The decompressed refrigerant is sent to the indoor heat exchanger 13 and expands to a low temperature and a low pressure, thereby lowering the surface temperature of the indoor heat exchanger 13. The indoor heat exchanger 13 whose surface temperature has fallen absorbs heat from the room air, thereby cooling the room air.

  After the heat absorption, the low-temperature gaseous refrigerant returns to the compressor 32. The air flow generated by the outdoor blower 35 promotes heat dissipation from the outdoor heat exchanger 36, and the air flow generated by the indoor blower 12 promotes heat absorption of the indoor heat exchanger 13. In the defrosting operation, the indoor fan 12 does not operate, and heat exchange by airflow is not actively performed indoors.

  Although not shown, the switching valve 13 is switched during the heating operation, and the refrigerant flow is reversed from that during the cooling operation. The compressor 32 circulates the refrigerant in a circulation mode during heating, that is, in a circulation mode in which the refrigerant discharged from the compressor 32 first enters the indoor heat exchanger 13.

  Here, when a plurality of outdoor units 30 and a plurality of refrigeration cycles are provided as in the air conditioner 1, the cycle piping is erroneously connected as shown in FIG. Can happen. For example, FIG. 3 is a schematic configuration diagram of the air conditioner 1 and shows a case where there is an erroneous connection in the cycle piping.

  According to FIG. 3, the first liquid pipe 2a and the first gas pipe 3a that are originally connected between the indoor unit 10 and the first outdoor unit 30a are incorrectly connected between the indoor unit 10 and the second outdoor unit 30b. It is connected to the. Furthermore, the second liquid pipe 2b and the second gas pipe 3b that are originally connected between the indoor unit 10 and the second outdoor unit 30b are erroneously connected between the indoor unit 10 and the first outdoor unit 30a. Yes. Although not shown, it is possible that the electrical wiring is erroneously connected incorrectly or a connection failure occurs.

  Therefore, the air conditioner 1 of the present embodiment has an inspection mode as an operation mode for detecting an erroneous connection or connection failure of electrical wiring or cycle piping. The inspection mode is activated by operating an inspection key 20 provided on the operation unit 14.

  Next, the operation in the inspection mode of the air conditioner 1 will be described along the flow shown in FIG. FIG. 4 is a flowchart showing the operation of the air conditioner 1 in the inspection mode.

  When the inspection key 20 of the operation unit 14 is operated in the air conditioner 1 and the inspection mode is started (start of FIG. 4), the indoor unit control unit 16 includes the first heat exchanger temperature detector 17a, the first liquid pipe. Output signals relating to the detected temperatures are received from the temperature detector 18a, the second heat exchanger temperature detector 17b, and the second liquid pipe temperature detector 18b, and the detected temperatures are set to the initial temperatures (step # 101). . Then, the indoor unit control unit 16 starts the cooling operation only for the first outdoor unit 30a (step # 102).

  Next, the indoor unit control unit 16 determines whether or not the cooling operation time (determination time) by the first outdoor unit 30a has passed a predetermined time (step # 103). The predetermined time as the determination time is arbitrarily set in advance and stored in the storage unit 21 or the like. When the cooling operation time by the first outdoor unit 30a has not passed the predetermined time (No in Step # 103), the indoor unit control unit 16 performs the first heat exchanger temperature detector 17a and the first liquid pipe temperature detector 18a. The output signals relating to the respective detected temperatures are received from, and each detected temperature is set to the current temperature (step # 104).

  Next, the indoor unit controller 16 calculates the difference between the initial temperature and the current temperature of the first heat exchanger temperature detector 17a or the first liquid pipe temperature detector 18a, and the first heat exchanger temperature detector 17a. Or it is determined whether the temperature change of the 1st liquid pipe temperature detector 18a is more than predetermined value (step # 105). When the temperature change of the 1st heat exchanger temperature detector 17a or the 1st liquid pipe temperature detector 18a is more than a predetermined value (Yes of Step # 105), the 1st heat exchanger 13a and the 1st outdoor unit 30a It is determined that the connection is normal, and the process proceeds to the next step # 107.

  On the other hand, when the temperature change of the 1st heat exchanger temperature detector 17a or the 1st liquid pipe temperature detector 18a is less than predetermined value (No of Step # 105), it returns to Step # 103 and the 1st outdoor unit 30a. It is determined whether or not the cooling operation time by has passed a predetermined time. And when the cooling operation time by the 1st outdoor unit 30a passes predetermined time (Yes of step # 103), the predetermined time of the temperature of the 1st heat exchanger 13a at the time of implementing the cooling operation by the 1st outdoor unit 30a It is determined that the change in is less than a predetermined value. Thereby, the indoor unit control part 16 determines with the connection between the 1st heat exchanger 13a and the 1st outdoor unit 30a having abnormality (step # 106).

  When the change in the temperature of the first heat exchanger 13a within a predetermined time when the cooling operation by the first outdoor unit 30a is performed is a predetermined value or more (Yes in Step # 105), the indoor unit control unit 16 Only the outdoor unit 30b starts the cooling operation (step # 107).

  Next, the indoor unit control unit 16 determines whether or not the cooling operation time by the second outdoor unit 30b has passed a predetermined time (step # 108). When the cooling operation time by the second outdoor unit 30b has not passed the predetermined time (No in Step # 108), the indoor unit control unit 16 performs the second heat exchanger temperature detector 17b and the second liquid pipe temperature detector 18b. The output signals relating to the respective detected temperatures are received from, and each detected temperature is set to the current temperature (step # 109).

  Next, the indoor unit control unit 16 calculates the difference between the initial temperature and the current temperature of the second heat exchanger temperature detector 17b or the second liquid pipe temperature detector 18b, and the second heat exchanger temperature detector 17b. Or it is determined whether the temperature change of the 2nd liquid pipe temperature detector 18b is more than predetermined value (step # 110). When the temperature change of the 2nd heat exchanger temperature detector 17b or the 2nd liquid pipe temperature detector 18b is more than a predetermined value (Yes of Step # 110), the 2nd heat exchanger 13b and the 2nd outdoor unit 30b It is determined that the connection is normal, and the process proceeds to the next step # 111.

  On the other hand, when the temperature change of the 2nd heat exchanger temperature detector 17b or the 2nd liquid pipe temperature detector 18b is less than predetermined value (No of Step # 110), it returns to Step # 108 and the 2nd outdoor unit 30b It is determined whether or not the cooling operation time by has passed a predetermined time. And when the cooling operation time by the 2nd outdoor unit 30b passes predetermined time (Yes of step # 108), the predetermined time of the temperature of the 2nd heat exchanger 13b at the time of implementing the cooling operation by the 2nd outdoor unit 30b It is determined that the change in is less than a predetermined value. Thereby, the indoor unit control unit 16 determines that there is an abnormality in the connection between the second heat exchanger 13b and the second outdoor unit 30b (step # 106).

  When the change in the temperature of the second heat exchanger 13b within a predetermined time when the cooling operation by the second outdoor unit 30b is performed is equal to or greater than a predetermined value (Yes in Step # 110), the indoor unit control unit 16 It is determined that the connection between the heat exchanger 13a and the first outdoor unit 30a and the connection between the second heat exchanger 13b and the second outdoor unit 30b are normal (step # 111). If it determines in step # 111 or step # 106, the indoor unit control part 16 will complete | finish inspection mode (end of FIG. 4).

  The indoor unit control unit 16 can notify the user of the inspection mode determination result using the notification unit 15. The notification of the determination result of the inspection mode is made, for example, by display on a display unit or notification by sound.

  As described above, in the inspection mode, the air conditioner 1 operates each of the plurality of outdoor units 30 one by one to determine whether or not the change in the temperature of the indoor unit 10 within a predetermined time is equal to or greater than a predetermined value. . When the change in the temperature of the indoor unit 10 within a predetermined time is equal to or greater than a predetermined value, it is determined that the air conditioner 1 is operating according to the command, and the electrical wiring and the cycle piping are considered to be normally connected. . On the other hand, if the change in the temperature of the indoor unit 10 within a predetermined time is less than the predetermined value, it is determined that the air conditioner 1 is not operating as instructed, and the electrical wiring and cycle piping are not normally connected. It is regarded.

Second Embodiment
Next, the air conditioner of 2nd Embodiment of this invention is demonstrated using FIG.5 and FIG.6. 5 and 6 are both flowcharts showing the operation of the air conditioner in the inspection mode, and are flowcharts to be combined by the connectors X and Y in the respective drawings. Since the basic configuration of this embodiment is the same as that of the first embodiment described above, the same components as those of the first embodiment are denoted by the same reference numerals and the description thereof is omitted. And

  In the air conditioner 1 of the second embodiment, when the inspection key 20 of the operation unit 14 is operated and the inspection mode is started (start of FIG. 5), the indoor unit control unit 16 detects the first heat exchanger temperature detector 17a. The output signals relating to the detected temperatures are received from the first liquid tube temperature detector 18a, the second heat exchanger temperature detector 17b, and the second liquid tube temperature detector 18b, and the detected temperatures are set to the initial temperatures. (Step # 201). Then, the indoor unit control unit 16 starts the cooling operation only for the first outdoor unit 30a (step # 202).

  Next, the indoor unit control unit 16 determines whether or not the cooling operation time by the first outdoor unit 30a has passed a predetermined time (step # 203). When the cooling operation time by the first outdoor unit 30a has not passed the predetermined time (No in Step # 203), the indoor unit control unit 16 includes the first heat exchanger temperature detector 17a and the first liquid pipe temperature detector 18a. The output signals relating to the detected temperatures are received from the second heat exchanger temperature detector 17b and the second liquid pipe temperature detector 18b, and the detected temperatures are set to the current temperatures (step # 204).

  Next, the indoor unit controller 16 calculates the difference between the initial temperature and the current temperature of the first heat exchanger temperature detector 17a or the first liquid pipe temperature detector 18a, and the first heat exchanger temperature detector 17a. Alternatively, it is determined whether or not the temperature change of the first liquid pipe temperature detector 18a is greater than or equal to a predetermined value (step # 205). When the temperature change of the 1st heat exchanger temperature detector 17a or the 1st liquid pipe temperature detector 18a is more than predetermined value (Yes of Step # 205), the 1st heat exchanger 13a and the 1st outdoor unit 30a It is determined that the connection is normal, and the indoor unit control unit 16 sets a numerical value “1” in the table 1 (step # 206).

  The “table” described here refers to the storage unit 21 or the like for determining the connection state between the first heat exchanger 13a and the second heat exchanger 13b and the first outdoor unit 30a and the second outdoor unit 30b. It means the storage area of information created in “Table 1” is a storage area corresponding to the first outdoor unit 30a, and “Table 2” is a storage area corresponding to the second outdoor unit 30b. The numerical value “1” set in each table corresponds to the first heat exchanger 13a, and the numerical value “2” corresponds to the second heat exchanger 13b.

  On the other hand, when the temperature change of the first heat exchanger temperature detector 17a or the first liquid pipe temperature detector 18a is less than a predetermined value (No in step # 205), the indoor unit control unit 16 determines the first heat exchanger temperature. Whether the difference between the initial temperature of the detector 17a and the current temperature of the second heat exchanger temperature detector 17b is equal to or greater than a predetermined value, or the initial temperature of the first liquid pipe temperature detector 18a and the second liquid pipe temperature It is determined whether or not the difference from the current temperature of the detector 18b is greater than or equal to a predetermined value (step # 207). When the temperature change of the indoor unit 10 in step # 207 is equal to or greater than a predetermined value (Yes in step # 207), it is determined that there is an erroneous connection between the second heat exchanger 13b and the first outdoor unit 30a, and the indoor unit control The unit 16 sets a numerical value “2” in the table 1 (step # 208).

  On the other hand, when the temperature change of the indoor unit 10 is less than the predetermined value (No in Step # 207), the process returns to Step # 203 to determine whether or not the cooling operation time by the first outdoor unit 30a has passed the predetermined time. judge. And when the cooling operation time by the 1st outdoor unit 30a passes predetermined time (Yes of step # 203), the change within the predetermined time of the temperature of the indoor unit 10 at the time of implementing the cooling operation by the 1st outdoor unit 30a Is determined to be less than the predetermined value. Thereby, the indoor unit control unit 16 determines that the connection between the first heat exchanger 13a or the second heat exchanger 13b and the first outdoor unit 30a is defective (step # 209).

  When the numerical value “1” is set in the table 1 (step # 206) or the numerical value “2” is set in the table 1 (step # 208), the indoor unit control unit 16 only cools the second outdoor unit 30b. Operation is started (step # 210).

  Next, the indoor unit control unit 16 determines whether or not the cooling operation time by the second outdoor unit 30b has passed a predetermined time (step # 211). When the cooling operation time by the second outdoor unit 30b has not passed the predetermined time (No in step # 211), the indoor unit control unit 16 performs the first heat exchanger temperature detector 17a and the first liquid pipe temperature detector 18a. The output signals relating to the detected temperatures are received from the second heat exchanger temperature detector 17b and the second liquid pipe temperature detector 18b, and the detected temperatures are set to the current temperatures (step # 212).

  Next, the indoor unit control unit 16 calculates the difference between the initial temperature and the current temperature of the second heat exchanger temperature detector 17b or the second liquid pipe temperature detector 18b, and the second heat exchanger temperature detector 17b. Or it is determined whether the temperature change of the 2nd liquid pipe temperature detector 18b is more than predetermined value (step # 213). When the temperature change of the 2nd heat exchanger temperature detector 17b or the 2nd liquid pipe temperature detector 18b is more than a predetermined value (Yes of Step # 213), the 2nd heat exchanger 13b and the 2nd outdoor unit 30b It is determined that the connection is normal, and the indoor unit control unit 16 sets a numerical value “2” in the table 2 (step # 214).

  On the other hand, when the temperature change of the second heat exchanger temperature detector 17b or the second liquid pipe temperature detector 18b is less than a predetermined value (No in Step # 213), the indoor unit control unit 16 determines the second heat exchanger temperature. Whether the difference between the initial temperature of the detector 17b and the current temperature of the first heat exchanger temperature detector 17a is equal to or greater than a predetermined value, or the initial temperature of the second liquid pipe temperature detector 18b and the first liquid pipe temperature It is determined whether or not the difference from the current temperature of the detector 18a is greater than or equal to a predetermined value (step # 215). When the temperature change of the indoor unit 10 in step # 215 is greater than or equal to a predetermined value (Yes in step # 215), it is determined that there is an erroneous connection between the first heat exchanger 13a and the first outdoor unit 30a, and the indoor unit control The unit 16 sets a numerical value “1” in the table 2 (step # 216).

  On the other hand, when the temperature change of the indoor unit 10 is less than the predetermined value (No in Step # 215), the process returns to Step # 211 to determine whether or not the predetermined time has elapsed for the cooling operation by the second outdoor unit 30b. judge. And when the cooling operation time by the 2nd outdoor unit 30b passes predetermined time (Yes of step # 211), the change within the predetermined time of the temperature of the indoor unit 10 at the time of implementing the cooling operation by the 2nd outdoor unit 30b Is determined to be less than the predetermined value. Thereby, the indoor unit control unit 16 determines that the connection between the first heat exchanger 13a or the second heat exchanger 13b and the second outdoor unit 30b is defective (step # 209).

  When the numerical value “2” is set in the table 2 (step # 214) or the numerical value “1” is set in the table 2 (step # 216), the indoor unit control unit 16 sets numerical values in all the tables 1 and 2. It is determined whether or not is buried (step # 217).

  When all the tables 1 and 2 are filled with numerical values (Yes in Step # 217), the indoor unit controller 16 includes the indoor unit 10, the first outdoor unit 30a, and the second unit including normal connection and erroneous connection. It is determined that the outdoor unit 30b is connected (step # 218). On the other hand, when the numerical values are not buried in all of the tables 1 and 2 (No in Step # 217), the indoor unit control unit 16 has a poor connection with the indoor unit 10, the first outdoor unit 30a, and the second outdoor unit 30b. (Step # 209). If it determines in step # 218 or step # 209, the indoor unit control part 16 will complete | finish inspection mode (end of FIG. 6).

  As described above, the air conditioner 1 detects that the indoor unit 10 and the first outdoor unit 30a and the second outdoor unit 30b are connected in the inspection mode, including normal connection and erroneous connection. . When the air conditioner 1 detects an erroneous connection between the indoor unit 10 and the first outdoor unit 30a and the second outdoor unit 30b based on the determination result of the inspection mode, the first outdoor unit 30a corresponding to the erroneous connection is detected. The command signal is exchanged and input to the second outdoor unit 30b. As a result, it is possible to perform the air-conditioning operation without any problem without performing repairs for returning the erroneous connection to the normal connection.

  In addition, when the air conditioner 1 detects an erroneous connection between the indoor unit 10 and the first outdoor unit 30a and the second outdoor unit 30b, a notification of an erroneous connection using the notification unit 15 and an erroneous connection are provided. It is possible to select replacement of command signals to the first outdoor unit 30a and the second outdoor unit 30b.

<Third Embodiment>
Next, the air conditioner of 3rd Embodiment of this invention is demonstrated using FIG. FIG. 7 is a schematic configuration diagram of the air conditioner. Since the basic configuration of this embodiment is the same as that of the first and second embodiments described above, the same components as those of the first and second embodiments are denoted by the same reference numerals as before. The description will be omitted. Further, in FIG. 7, drawing of detailed configurations of the indoor unit 10 and the outdoor unit 30 is omitted.

  In the air conditioner 1 of the third embodiment, as shown in FIG. 7, three or more n outdoor units 30 are connected to one indoor unit 10 (n is an arbitrary natural number of 3 or more). is there). The indoor unit 10 includes n indoor heat exchangers 13 corresponding to the n outdoor units 30, and the corresponding indoor heat exchanger 13 and the outdoor unit 30 are connected using the liquid pipe 2 and the gas pipe 3. Is done.

  Even when three or more outdoor units 30 are connected to one indoor unit 10 in this way, the air conditioner 1 operates each of the plurality of outdoor units 30 one by one in the inspection mode. Then, it is determined whether or not a change in the temperature of the indoor unit 10 within a predetermined time is equal to or greater than a predetermined value. And the air conditioner 1 detects the connection state of the indoor unit 10 and the outdoor unit 30 regarding electrical wiring and cycle piping.

<Fourth embodiment>
Next, the air conditioner of 4th Embodiment of this invention is demonstrated using FIG. FIG. 8 is a flowchart showing the operation of the check mode of the air conditioner. Since the basic configuration of this embodiment is the same as that of the first and second embodiments described above, the same components as those of the first and second embodiments are denoted by the same reference numerals as before. The description will be omitted.

  In the air conditioner 1 of the fourth embodiment, when the inspection key 20 of the operation unit 14 is operated and the inspection mode is started (start of FIG. 8), the indoor unit control unit 16 will be described in the first and second embodiments. Before executing the main determination process (step # 305) of the inspection mode, the correction process (steps # 301 to # 304) based on the outside air temperature is executed.

  First, the indoor unit control unit 16 detects the outside air temperature using the outside air temperature detector 37 provided in the outdoor unit 30 (step # 301). Next, the indoor unit control unit 16 determines whether or not the outside air temperature is lower than a predetermined temperature (step # 302). The predetermined temperature relating to the outside air temperature is arbitrarily set in advance and stored in the storage unit 21 or the like.

  When the outside air temperature is not lower than the predetermined temperature (No in Step # 302), the indoor unit control unit 16 sets a predetermined value related to the temperature change width of the indoor unit 10 serving as a reference in the main determination process in the inspection mode as usual. (Step # 303).

  On the other hand, when the outside air temperature is lower than the predetermined temperature (Yes in Step # 302), the indoor unit control unit 16 lowers the predetermined value related to the temperature change width of the indoor unit 10 serving as a reference in the main determination process in the inspection mode from the normal value. Set (step # 304). The predetermined value related to the temperature change width of the indoor unit 10 lowered from the normal is arbitrarily set in advance and stored in the storage unit 21 or the like.

  And the indoor unit control part 16 uses the predetermined value which concerns on the temperature change width of the indoor unit 10 set based on external temperature, and the main determination process of the inspection mode demonstrated in 1st and 2nd embodiment (step # 305). Execute. In this way, even when the outside air temperature is lower than the predetermined temperature, erroneous connection or connection failure is detected in a relatively short time.

<Fifth Embodiment>
Next, the air conditioner of 5th Embodiment of this invention is demonstrated using FIG. FIG. 9 is a flowchart showing the operation of the check mode of the air conditioner. Since the basic configuration of this embodiment is the same as that of the first and second embodiments described above, the same components as those of the first and second embodiments are denoted by the same reference numerals as before. The description will be omitted.

  In the air conditioner 1 of the fifth embodiment, when the inspection key 20 of the operation unit 14 is operated and the inspection mode is started (start of FIG. 9), the indoor unit control unit 16 will be described in the first and second embodiments. Before executing the main determination process (step # 405) of the inspection mode, the correction process (steps # 401 to # 404) based on the outside air temperature is executed.

  First, the indoor unit control unit 16 detects the outside air temperature using the outside air temperature detector 37 provided in the outdoor unit 30 (step # 401). Next, the indoor unit control unit 16 determines whether or not the outside air temperature is lower than a predetermined temperature (step # 402).

  When the outside air temperature is not lower than the predetermined temperature (No in Step # 402), the indoor unit control unit 16 sets a predetermined time for determining the temperature change of the indoor unit 10 in the main determination process in the inspection mode as usual ( Step # 403).

  On the other hand, when the outside air temperature is lower than the predetermined temperature (Yes in Step # 402), the indoor unit control unit 16 extends the predetermined time for determining the temperature change of the indoor unit 10 in the main determination process in the inspection mode from the normal time. Set (step # 404). The predetermined time for determining the temperature change of the indoor unit 10 extended from normal is arbitrarily set in advance and stored in the storage unit 21 or the like.

  And the indoor unit control part 16 uses the predetermined time for determining the temperature change of the indoor unit 10 set based on outside temperature, and the main determination process (step #) demonstrated in 1st and 2nd embodiment. 405) is executed. Thereby, even when the outside air temperature is lower than the predetermined temperature, erroneous connection or connection failure is accurately detected.

<Sixth Embodiment>
Next, the air conditioner of 6th Embodiment of this invention is demonstrated using FIG. FIG. 10 is a flowchart showing a process of reducing the number of operating outdoor units of the air conditioner. Since the basic configuration of this embodiment is the same as that of the first to fifth embodiments described above, the same components as those of the first to fifth embodiments are denoted by the same reference numerals as before. The description will be omitted.

  When a plurality of outdoor units 30 are connected to one indoor unit 10 as in the air conditioner 1, the number of the outdoor units 30 that are more than necessary for the air conditioning operation requested by the user is operated. It can happen. Therefore, the air conditioner 1 of the present embodiment executes a process of reducing the number of operating outdoor units 30 that is unnecessary to stop the operation of the outdoor units 30 when performing the requested air conditioning operation.

  In the air conditioner 1 of the sixth embodiment, when the normal air conditioning operation is started (start of FIG. 10), the indoor unit control unit 16 uses the indoor temperature detector 19 provided in the indoor unit 10. The room temperature is detected (step # 501). Next, the indoor unit control unit 16 determines whether or not an excessive number of outdoor units 30 are in operation (step # 502).

  As a determination criterion in step # 502, for example, the difference between the set room temperature and the current room temperature is used. For example, when the current indoor temperature reaches the set indoor temperature, the indoor unit control unit 16 determines that more than necessary outdoor units 30 are operating. Further, for example, when the current indoor temperature reaches a temperature that is lower by about 2 to 3 ° C. than the set indoor temperature, the indoor unit control unit 16 determines that more than necessary number of outdoor units 30 are operating. . These determination criteria are arbitrarily set in advance and stored in the storage unit 21 or the like.

  When the number of outdoor units 30 more than necessary is not operated (No in Step # 502), the indoor unit control unit 16 maintains the current number of the outdoor units 30 to be operated (Step # 503). And it returns to step # 501 and the detection of room temperature is performed again.

  On the other hand, when the number of outdoor units 30 more than necessary is operated (Yes in step # 502), the indoor unit control unit 16 operates the minimum number of outdoor units 30 and operates the remaining outdoor units 30. Is stopped (step # 504). And it returns to step # 501 and the detection of room temperature is performed again.

  As described above, the air conditioner 1 operates the minimum number of outdoor units 30 required for the air-conditioning operation requested by the user among the plurality of outdoor units 30 and stops the operation of the remaining outdoor units 30. .

<Seventh embodiment>
Next, the air conditioner of 7th Embodiment of this invention is demonstrated using FIG. FIG. 11 is a flowchart showing a process for reducing the number of operating outdoor units of an air conditioner. Since the basic configuration of this embodiment is the same as that of the first to fifth embodiments described above, the same components as those of the first to fifth embodiments are denoted by the same reference numerals as before. The description will be omitted.

  When the normal air conditioning operation is started in the air conditioner 1 of the seventh embodiment (start of FIG. 11), the indoor unit control unit 16 uses the indoor temperature detector 19 provided in the indoor unit 10 to The temperature is detected (step # 601). Next, the indoor unit control unit 16 determines whether or not an excessive number of outdoor units 30 are in operation (step # 602).

  When more than necessary number of outdoor units 30 are in operation (Yes in step # 602), the indoor unit control unit 16 refers to the accumulated operation time for each outdoor unit 30 stored in the storage unit 21 or the like (step #). 604). Prior to this, the indoor unit control unit 16 sequentially stores the accumulated operation time of each of the plurality of outdoor units 30 in the storage unit 21 or the like.

  Then, the indoor unit control unit 16 operates the minimum number of outdoor units 30 and stops the operation of the remaining outdoor units 30 in order from the outdoor unit 30 having a long accumulated operation time (step #). 605). Then, the process returns to step # 601 and the room temperature is detected again.

<Eighth Embodiment>
Next, the air conditioner of 8th Embodiment of this invention is demonstrated using FIG. FIG. 12 is a flowchart showing a process for reducing the number of operating outdoor units of an air conditioner. Since the basic configuration of this embodiment is the same as that of the first to fifth embodiments described above, the same components as those of the first to fifth embodiments are denoted by the same reference numerals as before. The description will be omitted.

  When the normal air conditioning operation is started in the air conditioner 1 of the eighth embodiment (start of FIG. 12), the indoor unit control unit 16 uses the indoor temperature detector 19 provided in the indoor unit 10 to The temperature is detected (step # 701). Next, the indoor unit control unit 16 determines whether or not the number of outdoor units 30 that are more than necessary is in operation (step # 702). It is assumed that the plurality of outdoor units 30 determined here have the same cooling capacity.

  When operating more than necessary number of outdoor units 30 (Yes in step # 702), the indoor unit control unit 16 refers to numerical information related to the cumulative operation time for each outdoor unit 30 stored in the storage unit 21 or the like. (Step # 704).

  The numerical information related to the accumulated operation time is obtained by using the accumulated operation time of the outdoor unit 30 and the alternating current flowing through the outdoor unit 30 during operation when each of the plurality of outdoor units 30 has the same cooling capacity. It is calculated. For example, this numerical information is obtained by sampling the alternating current instantaneously every minute during the period from the start to the end of the operation of the outdoor unit 30 and sequentially adding them.

  Prior to the reference in step # 704, the indoor unit control unit 16 sequentially stores numerical information obtained by calculating the cumulative operation time and the alternating current during operation of each of the plurality of outdoor units 30 in the storage unit 21 and the like. .

  The indoor unit control unit 16 operates the minimum number of outdoor units 30 and stops the operation of the remaining outdoor units 30, and the numerical information obtained by calculating the accumulated operation time and the alternating current during operation is large. The operation is stopped in order from the outdoor unit 30 (step # 705). Then, the process returns to step # 701, and the indoor temperature is detected again.

<Ninth Embodiment>
Next, the air conditioner system of 9th Embodiment of this invention is demonstrated using FIG. FIG. 13 is a schematic configuration diagram of an air conditioning system. Since the basic configuration of this embodiment is the same as that of the first to fifth embodiments described above, the same components as those of the first to fifth embodiments are denoted by the same reference numerals as before. The description will be omitted. In FIG. 13, drawing of detailed configurations of the indoor unit 10 and the outdoor unit 30 is omitted.

  As shown in FIG. 13, the air conditioning system 100 according to the ninth embodiment includes m sets of air conditioners 1 in which three or more n outdoor units 30 are connected to one indoor unit 10. (N and m are arbitrary natural numbers of 3 or more).

  The air conditioning system 100 having such a configuration operates the minimum number of outdoor units 30 required for the air conditioning operation requested by the user among the plurality of outdoor units 30, and stops the operation of the remaining outdoor units 30. .

  When stopping the operation of the outdoor unit 30, the air conditioning system 100 stops the operation in order from the outdoor unit 30 having a long cumulative operation time. Alternatively, when the air conditioning system 100 stops the operation of the outdoor unit 30, the numerical information calculated using the accumulated operation time of the outdoor unit 30 and the alternating current flowing through the outdoor unit 30 during operation is large from the outdoor unit 30. Stop operation in order.

  As described above, the air conditioner 1 in which the first outdoor unit 30a and the second outdoor unit 30b, which are two outdoor units, are connected to the single indoor unit 10, the first outdoor unit 30a and the second outdoor unit 30b. There is an inspection mode in which each of the outdoor units 30b is operated one by one to determine whether or not the change in the temperature of the indoor unit 10 within a predetermined time is equal to or greater than a predetermined value.

  According to this configuration, when the change in the temperature of the indoor unit 10 within a predetermined time is equal to or greater than a predetermined value, it is determined that the air conditioner 1 is operating according to the command, and the electrical wiring and the cycle piping are normally connected. It is regarded as being done. On the other hand, if the change in the temperature of the indoor unit 10 within a predetermined time is less than the predetermined value, it is determined that the air conditioner 1 is not operating as instructed, and the electrical wiring and cycle piping are not normally connected. It is regarded. Therefore, the air conditioner 1 can easily detect misconnection or connection failure. Moreover, since the single indoor unit control part 16 performs temperature detection and determination of a connection failure, determination with higher precision can be performed.

  Moreover, the air conditioner 1 is provided with the operation part 14 for the indoor unit 10 to start inspection mode. Here, for example, when the inspection mode is activated from the outdoor unit, communication failure may occur with the indoor unit that detects the temperature. For example, when there is a connection failure in the electrical wiring, there is a possibility that the inspection mode cannot be started from the outdoor unit. However, according to the configuration of the present embodiment, the inspection mode can be activated from the indoor unit, and communication failure is suppressed.

  Furthermore, since the air conditioner 1 includes the notification unit 15 for the indoor unit 10 to notify the determination result of the inspection mode, the determination result of the inspection mode can be known indoors. For example, when the inspection mode can be activated from the indoor unit, the inspection mode activation, determination of poor connection, and notification of the determination result are all performed on the indoor side, and are not easily affected by communication problems or the like. Is possible.

  In addition, when the air conditioner 1 detects an erroneous connection between the indoor unit 10 and the first outdoor unit 30a and the second outdoor unit 30b based on the determination result of the inspection mode, the first outdoor unit 30a corresponding to the erroneous connection is detected. The command signal is exchanged and input to the second outdoor unit 30b. According to this configuration, it is possible to perform the air-conditioning operation without any problem without performing repair for returning the erroneous connection to the normal connection. Therefore, the work efficiency can be improved.

  Furthermore, the air conditioner 1 includes a notification unit 15 for the indoor unit 10 to notify the determination result of the inspection mode, and based on the determination result of the inspection mode, the indoor unit 10, the first outdoor unit 30a, and the second outdoor unit 30b. Can be selected between notification of erroneous connection using the notification unit 15 and replacement of command signals to the first outdoor unit 30a and the second outdoor unit 30b corresponding to the erroneous connection. is there. According to this configuration, regarding the determination result of the inspection mode, the user can arbitrarily select notification of erroneous connection and replacement of the command signal. Therefore, it is possible to increase the degree of freedom in the operation of detecting erroneous connection or connection failure.

  In addition, when the outside air temperature is lower than the predetermined temperature, the air conditioner 1 lowers the predetermined value related to the temperature change width of the indoor unit 10 in the inspection mode from the normal value. Here, when the outside air temperature is relatively low, the temperature change of the indoor unit 10 may be relatively small during the cooling operation. As a result, if the predetermined value related to the temperature change width of the indoor unit 10 is normal, it may take a very long time for the determination. Therefore, according to the configuration of the present embodiment, even if the outside air temperature is lower than the predetermined temperature, it is possible to detect erroneous connection or connection failure in a relatively short time.

  In addition, when the outside air temperature is lower than the predetermined temperature, the air conditioner 1 extends the predetermined time for determining the temperature change of the indoor unit 10 in the inspection mode from the normal time. Here, when the distance between the indoor unit and the outdoor unit is relatively long, the temperature change of the indoor unit 10 may take a relatively long time. Thereby, when the predetermined time for determining the temperature change of the indoor unit 10 is normal, there is a possibility that accurate determination cannot be performed. Therefore, according to the configuration of the present embodiment, it is possible to accurately detect erroneous connection or connection failure even when the outside air temperature is lower than the predetermined temperature.

  Then, the air conditioner 1 operates the minimum number of outdoor units 30 required for the air conditioning operation requested by the user among the plurality of outdoor units 30 and stops the operation of the remaining outdoor units 30. According to this configuration, the air conditioning operation can be performed using the minimum number of outdoor units 30. Therefore, the air conditioner 1 can suppress power consumption.

  Moreover, the air conditioner 1 is provided with the memory | storage part 21 which memorize | stores the accumulated operation time of each of the some outdoor unit 30, and stops operation | movement in order from the outdoor unit 30 with long accumulated operation time. According to this configuration, only the specific outdoor unit 30 can suppress the cumulative operation time from becoming extremely long. Therefore, it is possible to suppress the lifetime of only the specific outdoor unit 30 from becoming extremely short, and it is possible to make the lifetimes of the plurality of outdoor units 30 uniform.

  The air conditioner 1 has a plurality of outdoor units 30 each having the same cooling capacity, and is calculated using the accumulated operation time of each of the outdoor units 30 and the alternating current flowing through each of the outdoor units 30 during operation. A storage unit 21 for storing numerical information is provided, and the operation is stopped in order from the outdoor unit 30 having the largest numerical information. According to this configuration, when the outdoor unit 30 unnecessary for performing the air conditioning operation is stopped, the outdoor unit 30 is stopped in consideration of the cumulative operation time of the outdoor unit 30 and the alternating current flowing during the operation. be able to. Therefore, it is possible to improve the uniform life of the plurality of outdoor units 30.

  Further, as described above, the air conditioning system 100 including a plurality of sets of the air conditioners 1 in which a plurality of outdoor units 30 are connected to one indoor unit 10 is required among the plurality of outdoor units 30. The minimum number of outdoor units 30 necessary for air conditioning operation are operated, and the remaining outdoor units 30 are stopped. According to this configuration, in the air conditioning system 100, it is possible to suppress power consumption and make the life of the outdoor units 30 uniform.

  Although the embodiments of the present invention have been described above, the scope of the present invention is not limited to these embodiments, and various modifications can be made without departing from the spirit of the invention.

  The present invention can be used in an air conditioner and an air conditioning system.

DESCRIPTION OF SYMBOLS 1 Air conditioner 2 Liquid pipe 3 Gas pipe 10 Indoor unit 13 Indoor heat exchanger 14 Operation part 15 Notification part 16 Indoor unit control part 13a 1st indoor heat exchanger 13b 2nd indoor heat exchanger 20 Inspection key 21 Memory | storage part 30 Outdoor unit 30a First outdoor unit 30b Second outdoor unit 100 Air conditioning system

Claims (10)

In an air conditioner in which a plurality of outdoor units are connected to a single indoor unit,
An air conditioner having an inspection mode for operating each of the plurality of outdoor units one by one and determining whether or not a change in temperature of the indoor unit within a predetermined time is equal to or greater than a predetermined value.   The air conditioner according to claim 1, wherein the indoor unit includes an operation unit for starting the inspection mode.   The air conditioner according to claim 1 or 2, wherein the indoor unit includes a notification unit for notifying the determination result of the inspection mode.   When the erroneous connection between the indoor unit and the plurality of outdoor units is detected based on the determination result of the inspection mode, the command signal is switched and input to the plurality of outdoor units corresponding to the erroneous connection. The air conditioner according to any one of claims 1 to 3, wherein the air conditioner is characterized. The indoor unit includes a notification unit for notifying the determination result of the inspection mode,
When erroneous connection between the indoor unit and the plurality of outdoor units is detected based on the determination result of the inspection mode, notification of erroneous connection and replacement of command signals to the plurality of outdoor units corresponding to the erroneous connection And the air conditioner according to claim 4, wherein the air conditioner can be selected.   When the outside air temperature is lower than a predetermined temperature, the predetermined value related to the temperature change width of the indoor unit in the inspection mode is lowered than normal, or when the outside air temperature is lower than the predetermined temperature, the temperature change of the indoor unit in the inspection mode The air conditioner according to any one of claims 1 to 5, wherein the predetermined time for determining whether or not is longer than usual.   The minimum number of said outdoor units required for the air conditioning operation requested | required among the said some outdoor units is drive | operated, and the operation | movement of the remaining said outdoor units is stopped. An air conditioner according to any one of the above. A storage unit that stores the cumulative operation time of each of the plurality of outdoor units;
The air conditioner according to claim 7, wherein the operation is stopped in order from the outdoor unit having a long cumulative operation time. Each of the plurality of outdoor units has the same cooling capacity,
A storage unit that stores numerical information calculated using the cumulative operation time of each of the outdoor units and the alternating current that flows through each of the outdoor units during operation,
The air conditioner according to claim 7, wherein the operation is stopped in order from the outdoor unit having the largest numerical information. In an air conditioning system including a plurality of air conditioner sets in which one or more outdoor units are connected to a single indoor unit,
An air conditioning system that operates the minimum number of the outdoor units required for the air conditioning operation requested among the plurality of outdoor units and stops the operation of the remaining outdoor units.

Images