WO2017082346A1

WO2017082346A1 - Air conditioning system

Info

Publication number: WO2017082346A1
Application number: PCT/JP2016/083368
Authority: WO
Inventors: 健太朗松原
Original assignee: 東芝キヤリア株式会社
Priority date: 2015-11-12
Filing date: 2016-11-10
Publication date: 2017-05-18
Also published as: EP3376126B1; EP3376126A1; EP3376126A4

Abstract

According to an embodiment of the present invention, an air conditioning system has an outdoor unit, first indoor unit, second indoor unit, first temperature detection unit, second temperature detection unit, third temperature detection unit, fourth temperature detection unit, and control unit. In the cases where a first temperature difference, i.e., the difference between the temperature detected by the first temperature detection unit and the temperature detected by the third temperature detection unit, is equal to or more than a first threshold value, and a second temperature difference, i.e., the difference between the temperature detected by the second temperature detection unit and the temperature detected by the fourth temperature detection unit, is less than a second threshold value, the control unit determines whether a refrigerant piping system connected to the first indoor unit and/or a first communication line connected to the first indoor unit is correctly connected or not.

Description

Air conditioning system

Embodiments described herein relate generally to an air conditioning system.
This application claims priority based on Japanese Patent Application No. 2015-221940 filed in Japan on November 12, 2015, the contents of which are incorporated herein by reference.

Conventionally, an air conditioning system is known in which a plurality of indoor units are connected to one outdoor unit by a refrigerant pipe and a communication line. This type of air conditioning system uses a sensor that detects the refrigerant temperature via a heat exchanger to determine whether the connection between the pipe and the communication line is correct based on changes in the refrigerant temperature before and after supplying the refrigerant to the pipe. It may be judged.

Japanese Patent Laid-Open No. 5-33982

However, in the conventional air conditioning system, it may not be possible to accurately determine whether the pipe or the communication line is correctly connected.
The problem to be solved by the present invention is to provide an air conditioning system capable of determining whether a pipe or a communication line is correctly connected with higher accuracy.

The air conditioning system of the embodiment includes an outdoor unit, a first indoor unit, a second indoor unit, a first temperature detection unit, a second temperature detection unit, and a third temperature detection unit, It has a 4th temperature detection part and a control part. The outdoor unit has at least a compressor and can be connected to a refrigerant piping system. The first indoor unit has a first heat exchanger and can be connected to the refrigerant piping system. The second indoor unit has a second heat exchanger and can be connected to the refrigerant piping system. The first temperature detection unit detects the temperature of the first heat exchanger. The second temperature detection unit detects the temperature of the second heat exchanger. The third temperature detection unit is provided for the first indoor unit and detects the temperature of the air-conditioning target space corresponding to the first indoor unit. The fourth temperature detection unit is provided for the second indoor unit and detects the temperature of the air-conditioning target space corresponding to the second indoor unit. The control unit has a first temperature difference, which is a difference between the temperature detected by the first temperature detection unit and the temperature detected by the third temperature detection unit, equal to or greater than a first threshold, and When the second temperature difference, which is the difference between the temperature detected by the second temperature detector and the temperature detected by the fourth temperature detector, is less than the second threshold, the first indoor unit Whether at least one of the first refrigerant pipe connected to the first indoor unit and the first communication line connected to the first indoor unit is correctly connected in the refrigerant pipe system connected to Determine whether or not.

The figure which shows the structure of the air conditioning system. The figure for demonstrating the structure of the control part of the air conditioning system. The flowchart which shows the flow of a process of the check operation | movement performed by the outdoor side control part 28. FIG. The figure for demonstrating the outline | summary of the check operation | movement performed by the outdoor side control part 28. FIG. The flowchart which shows the flow of the determination process performed by the outdoor side control part 28. FIG. The flowchart which shows the flow of the process performed by the outdoor side control part 28 of 2nd Embodiment. The figure for demonstrating the outline | summary of the check operation | movement performed by the outdoor side control part 28 of 2nd Embodiment.

Hereinafter, an air conditioning system of an embodiment will be described with reference to the drawings.

(First embodiment)
FIG. 1 is a diagram showing the configuration of the air conditioning system 1. The air conditioning system 1 may include an outdoor unit 10 and indoor units 30-1, 30-2,... 30-n. Hereinafter, when an indoor unit is not distinguished from other indoor units, it is simply referred to as an indoor unit 30. The indoor units 30 are installed in different rooms, for example. The outdoor unit 10 and each indoor unit 30-1 are connected to communication pipes 2-1-1, 2-1-2, ... 2-n-2.

The outdoor unit 10 includes a compressor 12, an accumulator 13, a four-way valve 14, an outdoor heat exchanger 16, and expansion valves 18-1 to 18-n.

The compressor 12 compresses the refrigerant and discharges it to the refrigerant pipe 20 through the four-way valve 14. The compressor 12 circulates the refrigerant in the direction of the arrow in the figure. The refrigerant is, for example, R410A or R32. The refrigerant may be a refrigerant containing 50% or more of R32. In the figure, the white arrow indicates the refrigerant flow during cooling, and the black arrow indicates the refrigerant flow during heating. In the present embodiment, as an example, the operation of the air conditioning system 1 during cooling will be mainly described. The accumulator 13 is provided adjacent to the compressor 12. The accumulator 13 separates the refrigerant returning to the compressor 12 into a gas phase refrigerant and a liquid phase refrigerant.

The four-way valve 14 switches the direction in which the refrigerant discharged from the compressor 12 is circulated. The four-way valve 14 switches between a state in which the compressor 12 and the outdoor heat exchanger 16 are conducted and a state in which the compressor 12 and the indoor heat exchanger 32 are conducted. For example, the four-way valve 14 circulates the refrigerant discharged from the compressor 12 to the outdoor heat exchanger 16. The four-way valve 14 circulates the refrigerant discharged from the compressor 12 to the connection pipes 2-1-1 and 2-n-1.

The four-way valve 14, the outdoor heat exchanger 16, and the expansion valves 18-1 to 18-n are connected through

refrigerant pipes

20 and 21. When the expansion valves 18-1 to 18-n are not distinguished, they are simply referred to as the expansion valve 18. The outdoor heat exchanger 16 liquefies the refrigerant discharged from the compressor 12 and releases heat contained in the refrigerant. The expansion valve 18 is connected to the indoor unit 30 via the communication pipe 2. The expansion valve 18 reduces the temperature of the liquid refrigerant to a low pressure by performing pressure reduction and flow control of the refrigerant that has become the liquid discharged from the outdoor heat exchanger 16.

The indoor unit 30 includes an indoor side heat exchanger 32, a fan 34, an indoor side heat exchanger temperature sensor 36, and an indoor side temperature sensor 38. The indoor heat exchanger 32 evaporates the refrigerant discharged from the expansion valve 18 by exchanging heat with air. The fan 34 blows the air heat-exchanged by the indoor heat exchanger 32 to the space to be air-conditioned. The indoor heat exchanger temperature sensor 36 detects the temperature of the indoor heat exchanger 32. The indoor side temperature sensor 38 detects the temperature of the room in which the indoor unit 30 is installed.

FIG. 2 is a diagram for explaining the configuration of the control unit of the air conditioning system 1. In addition to the configuration described in FIG. 1, the air conditioning system 1 further includes an outdoor operation unit 26, an outdoor control unit 28, an indoor operation unit 40, and an indoor control unit 42. The outdoor side control unit 28 and the indoor side control unit 42 are connected to each other by a communication line and an electric line.

The outdoor side control unit 28 or the indoor side control unit 42 is, for example, a processor such as a CPU (Central Processing Unit). The outdoor side control unit 28 or the indoor side control unit 42 may be hardware such as LSI (Large Scale Integration) or ASIC (Application Specific Specific Integrated Circuit).

The outdoor operation unit 26 includes a mode switching button, a display unit, and the like. The outdoor side operation part 26 supplies the signal according to a user's operation to the outdoor side control part 28. FIG. When the check operation is instructed, the outdoor operation unit 26 supplies a signal indicating that the check operation is instructed to the outdoor control unit 28. The check operation is an operation for determining whether or not the piping and the communication line between the outdoor unit 10 and the indoor unit 30 are normally (correctly) connected (details will be described later). Moreover, the display part of the outdoor side operation part 26 displays the information which shows the result of a check operation | movement, and abnormality of the air conditioning system 1. FIG.

The indoor side operation unit 40 is provided corresponding to each of the plurality of indoor units 30. The indoor side operation unit 40 includes a set temperature change button for the air conditioning target space of the indoor unit 30, an operation mode switching button, an indoor side display unit, and the like. The indoor side operation unit 40 supplies a signal corresponding to a user operation to the indoor side control unit 42. The display unit of the indoor side operation unit 40 displays the operating state of the indoor unit 30, the state of the air-conditioning target space, the set operation mode, and the like.

The outdoor control unit 28 controls the driving of the compressor 12. The outdoor side control unit 28 controls the opening degree of the expansion valve 18. The outdoor side control unit 28 generates an instruction signal based on a signal supplied from the indoor side operation unit 40 and information acquired from the indoor side control unit 42. The outdoor control unit 28 supplies an instruction signal to the compressor 12, the expansion valve 18, the outdoor operation unit 26, and the indoor control unit 42. Details of the processing of the outdoor control unit 28 will be described later.

The indoor side control unit 42 is provided corresponding to each of the plurality of indoor units 30. The indoor side control unit 42 controls each unit included in the indoor unit 30 based on the instruction signal supplied from the outdoor side control unit 28. The indoor side control unit 42 supplies information or signals acquired from the indoor side heat exchanger temperature sensor 36, the indoor side temperature sensor 38, and the indoor side operation unit 40 to the outdoor side control unit 28.

FIG. 3 is a flowchart showing a flow of processing of a check operation (determination of whether the connection of the piping or the communication line is normal) executed by the outdoor side control unit 28. First, the outdoor side control part 28 selects the indoor unit 30 in which the determination of a connection state is not complete | finished among several indoor units 30 (step S100).

The outdoor side controller 28 controls the fan 34 of the indoor unit 30 selected in step S100 to be in an on state (step S102), and controls the expansion valves 18 of all the indoor units 30 to be in an open state (step S104). The outdoor side control part 28 controls the air conditioning system 1 to a standby state for predetermined time (step S106). Next, the outdoor side control part 28 performs the determination process of a connection state (step S108). Details of the determination process will be described later.

Next, the outdoor side control part 28 determines whether the connection state of all the indoor units 30 was determined (step S110). When the connection state of all the indoor units 30 has not been determined, the process returns to step S100. When the connection states of all the indoor units 30 are determined, the process of this flowchart ends.

FIG. 4 is a diagram for explaining an outline of the check operation executed by the outdoor side control unit 28. For example, the indoor unit 30-1 having the room A as the air-conditioned space, the indoor unit 30-2 having the room B as the air-conditioned space, and the indoor unit 30-3 having the room C as the air-conditioned space are checked. It will be explained as the target of Further, it is assumed that the determination process is executed one by one in the order from room A to room C. In the illustrated example, the temperature change (from TC-A to TC-C in the figure) of the indoor side heat exchanger 32 of the A room and the C room from the start to the end of the check operation is shown. Moreover, the open / close state of the expansion valve 18 that circulates the refrigerant in the A chamber and the C chamber every hour (PMV A to PMV C in the figure) and the operating state of the compressor 12 every hour are shown.

First, the outdoor side control unit 28 controls the compressor 12 to be in an ON state, and controls the expansion valve 18 that circulates the refrigerant in the indoor unit 30-1 to a predetermined opening state. The outdoor control unit 28 executes the determination process for the A room, and when the determination process for the A room is completed, the compressor 12 is turned off and at least the fan 34 of the indoor unit 30-2 is controlled to be turned on. Here, the fans 34 of all the indoor units 30-1 and 30-3 may be controlled to be turned on. The outdoor control unit 28 controls the expansion valves 18 of the indoor units 30-1 and 30-3 to be in an open state. These states are maintained for a predetermined time. Hereinafter, the time for maintaining the compressor 12 in the off state, at least the fan 34 of the indoor unit 30 to be subjected to the determination process of the next connected state, and maintaining all the expansion valves 18 in the open state for a predetermined time is an interval time. That's it.

The interval time is, for example, the determination process of the indoor unit 30-1 in which the temperature of the indoor heat exchanger 32 of the indoor unit 30-2 to be subjected to the next determination process of the connection state is the object of the immediately previous determination process. It is a time set for recovering the lowered temperature assuming that the temperature has dropped during the period. The interval time may be a preset time. The interval time may be a time determined by the outdoor side controller 28 based on the detection result of the indoor heat exchanger temperature sensor 36 or the indoor temperature sensor 38.

By controlling the fan 34 to be in the on state at the interval time, the temperature of the indoor side heat exchanger 32 of the indoor unit 30 or the air conditioning target space can be easily recovered to the state before the start of the connection state determination process. . Further, by controlling the expansion valves 18 of the indoor units 30-1 to 30-3 to be in an open state, the indoor units connected to other than the residual refrigerant in the pipe and the pipe in which the refrigerant is circulated by the pressure change in the pipe The temperature change etc. which arise in 30 can be suppressed.

After the interval time has elapsed, the process for determining the connection state of room B is executed, and after the interval time has elapsed, the process for determining the connection state of room C is executed. Thereby, it is determined whether the piping and communication line of the indoor unit 30 connected to the outdoor unit 10 are normally connected.

In addition, in addition to the expansion valve 18, the air conditioning system 1 of the embodiment may further include an indoor expansion valve between the communication pipe 2 of the indoor unit 30 and the indoor heat exchanger 32. In this case, when the connection state determination process is being executed, the indoor expansion valve different from the indoor expansion valve included in the indoor unit 30 to be determined may be controlled to be closed. Thereby, the influence of the residual refrigerant | coolant and pressure change which arise in the indoor units 30 other than the determination object by the determination process of a connection state can be reduced.

FIG. 5 is a flowchart showing a flow of determination processing executed by the outdoor side control unit 28. First, the outdoor side control unit 28 controls the compressor 12 to be in an ON state and the expansion valve 18-1 of the indoor unit 30-1 to be determined as being connected to a predetermined opening state (step S150). Here, the indoor unit 30-1 that is the determination target of the connection state corresponds to the “first indoor unit” in the claims, and the indoor units 30-2 and 30-3 that are not the determination target of the connection state are patents. This corresponds to “an indoor unit other than the first indoor unit” in the claims. The indoor-side heat exchanger 32-1 corresponds to the “first heat exchanger” in the claims, and the indoor-side heat exchanger temperature sensor 36-1 is the “first temperature detector” in the claims. And the indoor side temperature sensor 38-1 corresponds to the “third temperature detection unit” in the claims. The indoor side heat exchangers 32-2 and 32-3 correspond to the “second heat exchanger” in the claims, and the indoor side heat exchanger temperature sensors 36-2 and 36-3 are in the claims. The interior side temperature sensors 38-2 and 38-3 correspond to the “second temperature detection unit” and the “fourth temperature detection unit” in the claims.

The rotation speed of the compressor 12 is, for example, 25% or less with respect to the maximum rotation speed of the compressor 12. By suppressing the rotational speed of the compressor 12, the amount of the refrigerant liquid returning to the accumulator 13 during the check operation can be suppressed, and the load applied to the compressor 12 can be reduced. The opening degree of the expansion valve 18-1 is 25% or less with respect to the maximum flow opening degree of the expansion valve 18, for example. By setting the opening degree of the expansion valve 18-1 to 25% or less, it is possible to suppress a decrease in the temperature of the indoor heat exchanger 32 of the indoor unit 30-1 that is the determination target and a prolonged processing time. Can do.

Next, the outdoor side controller 28 determines whether or not the temperature difference ΔT is equal to or higher than the temperature T1 (step S152). The temperature difference ΔT is detected by the temperature TA detected by the indoor temperature sensor 38-1 of the indoor unit 30-1 to be determined and the indoor heat exchanger temperature sensor 36-1 of the indoor unit 30-1 to be determined. It is a difference from the measured temperature TC.

When the temperature difference ΔT is not equal to or higher than the temperature T1, the outdoor control unit 28 determines whether or not a predetermined time has elapsed (step S154). If the predetermined time has not elapsed, the process of step S152 is repeated. When the predetermined time has elapsed, the outdoor side control unit 28 determines that there is a possibility that an abnormality exists in the connection state of the piping and the communication line of the indoor unit 30-1 to be determined (step S166). This is because the temperature detected by the indoor-side heat exchanger temperature sensor 36-1 has not decreased more than a predetermined value even though the refrigerant is circulated through the indoor unit 30-1 to be determined. In this case, the outdoor side control unit 28 and the communication line between the indoor side control unit 42 are misconnected, and the controlled indoor side control unit 42 and the actually controlled indoor side control unit 42 are connected to each other. There may be a difference. Further, the piping between the indoor unit 30-1 and the outdoor unit 10 is erroneously connected, and there is a difference between the indoor unit 30-1 to be circulated through the refrigerant and the indoor unit 30 in which the refrigerant is actually circulated. It may have occurred.

When the temperature difference ΔT is equal to or higher than the temperature T1, the outdoor side control unit 28 determines whether or not the temperature difference ΔTn is equal to or higher than the temperature T2 for all other indoor units 30 (step S156). The temperature difference ΔTn is the difference between the temperature TAn detected by the indoor temperature sensor 38 of the indoor unit 30 that is not the connection state determination target and the temperature TCn detected by the indoor heat exchanger temperature sensor 36 of the indoor unit 30. It is a difference. When there are a plurality of indoor units 30 that are not the determination targets, the outdoor side control unit 28 detects the temperature TAn detected by the indoor temperature sensor 38 provided in each of the indoor units 30 that are not the determination targets, and the indoor units 30. The temperature TCn and the temperature difference ΔTn detected by the indoor side heat exchanger temperature sensor 36 provided in each are calculated. The outdoor side controller 28 determines whether or not all the calculated temperature differences ΔTn are equal to or higher than the temperature T2. If any one of the calculated temperature differences ΔTn is equal to or higher than the temperature T2, the process proceeds to step S160. If all the calculated temperature differences ΔTn are not equal to or higher than the temperature T2, the process proceeds to step S158.

If all the temperature differences ΔTn are not equal to or higher than the temperature T2, the outdoor side control unit 28 determines that the indoor unit 30-1 to be determined is normally connected to the outdoor unit 10 (step S158). In this case, the outdoor side control part 28 controls the compressor 12 to an OFF state (step S168). This is because the temperature detected by the indoor heat exchanger temperature sensor 36 that is not the determination target has not decreased by the temperature T2 or more, and therefore it is estimated that the refrigerant is not circulating in the indoor unit 30 that is not the determination target. For example, the temperature T2 is a smaller value than the temperature T1.

When any temperature difference ΔTn among the calculated temperature differences ΔTn is equal to or higher than the temperature T2, the outdoor side control unit 28 waits until a predetermined time elapses (step S160). When the predetermined time has elapsed, the outdoor side control unit 28 determines whether or not the temperature TC is equal to or lower than the temperature TCn (step S162). When there are a plurality of indoor units 30 that are not to be determined, the outdoor control unit 28 determines the temperature TC detected by the indoor heat exchanger temperature sensor 36 of the indoor unit 30-1 to be determined and the indoors that are not to be determined. It compares with temperature TCn detected by the indoor side heat exchanger temperature sensor 36 provided in each of the units 30. If the temperature TC is equal to or lower than all the other temperatures TCn, the process proceeds to step S164. If the temperature TC is not equal to or lower than any one of the temperatures TCn, the process proceeds to step S166.

When the temperature TC is not equal to or lower than the temperature TCn, the outdoor side control unit 28 determines that there is a possibility that there is an abnormality in the connection state of the piping and the communication line of the indoor unit 30-1 to be determined (step S166), and step The process proceeds to S168. When the temperature TC is equal to or lower than the temperature TCn, the outdoor side control unit 28 determines that the indoor unit 30-1 to be determined is normally connected to the outdoor unit 10 (step S164), and turns off the compressor 12 (Step S168). In this case, there is a difference of a predetermined temperature or more between the temperature of the indoor side temperature sensor 38 of the indoor unit 30 that is not the determination target and the temperature of the indoor side heat exchanger temperature sensor 36 of the indoor unit 30 that is not the determination target. Since the temperature of the indoor side temperature sensor 38-1 of the indoor unit 30-1 to be determined is lower than the temperature of the indoor temperature sensor 38 of the other indoor unit 30, the refrigerant circulates to the indoor unit 30-1 to be determined. It is estimated that Thereby, the process of this flowchart is complete | finished.

As described above, when the determination process for one indoor unit 30-1 is completed, for example, the determination process for the next indoor unit 30-2 is executed. In the determination process of the next indoor unit 30-2, the indoor unit 30-1 determined to have a normal connection with the outdoor unit 10 is excluded from the comparison target in the determination process. For example, in the process for determining whether or not the temperature difference ΔTn in step S156 is equal to or higher than the temperature T2, and the process for determining whether or not the temperature TC in step S162 is equal to or lower than the temperature TCn, the connection with the outdoor unit 10 is normal. The indoor unit 30-1 determined to be is excluded from the comparison target. On the other hand, when it is determined that there may be an abnormality in the connection state of the piping and communication line between the outdoor unit 10 and the indoor unit 30-1, the indoor unit 30-1 has the temperature difference ΔTn in step S156. The process for determining whether or not the temperature is equal to or higher than the temperature T2 and the process for determining whether or not the temperature TC in step S162 is equal to or lower than the temperature TCn are included in the comparison targets.

Further, when the connection state determination process is executed for all the indoor units 30 and the check operation is completed, the outdoor side control unit 28 displays the result of the check operation on the display unit of the outdoor side operation unit 26. For example, information indicating the presence / absence of the indoor unit 30 that may not be normally connected to the outdoor unit 10 is displayed on the display unit of the outdoor operation unit 26. Further, identification information of the indoor unit 30 that is not normally connected to the outdoor unit 10 is displayed on the display unit of the outdoor operation unit 26.

Incidentally, it may be determined whether or not the connection between the piping of the indoor unit and the outdoor unit and the signal line is normal based on the temperature change of the indoor heat exchanger. In this case, the temperature of the indoor heat exchanger that does not flow the refrigerant may also change due to the influence of the refrigerant remaining in the indoor heat exchanger, and communication between the pipes of the outdoor unit 10 and the indoor unit 30 with high accuracy is possible. In some cases, it is impossible to determine whether or not the connection with the line is normal.

On the other hand, in the air conditioning system 1 of the present embodiment, even when the residual refrigerant is present by the determination process described above and there is a temperature change in the indoor unit 30 and the air-conditioning target space that are different from the target of the determination process. Thus, it is possible to determine whether or not the connection between the piping of the outdoor unit 10 and the indoor unit 30 and the communication line is normal. Furthermore, in the air conditioning system 1 according to the present embodiment, the determination process is performed in a state where the temperature of the indoor heat exchanger 32 of the indoor unit 30 is maintained at a predetermined level or higher, so the outdoor unit 10 and the indoor unit are more accurately detected. It can be determined whether the connection of the piping and the communication line with 30 is normal.

According to the first embodiment described above, the outdoor control unit 28 has the temperature difference ΔT of the indoor unit 30 that is the determination target of the connection state is equal to or higher than the temperature T1, and the indoor unit 30 that is not the determination target. When temperature difference (DELTA) Tn is not more than temperature T2, it determines with the connection state of the refrigerant | coolant piping or communication line connected to the indoor unit 30 of determination object being normal. Moreover, the outdoor side control part 28 is the case where temperature TC is below temperature TCn after predetermined time passes, even if the temperature difference (DELTA) Tn of the indoor unit 30 which is not a connection state judgment object is more than temperature T2. Then, it is determined that the connection state of the refrigerant pipe or the communication line connected to the indoor unit 30 to be determined is normal. As a result, the air conditioning system 1 can determine whether the connection of the piping or the communication line between the outdoor unit 10 and the indoor unit 30 is normal with higher accuracy.

(Second Embodiment)
Hereinafter, the second embodiment will be described. Here, the difference from the first embodiment will be mainly described, and the description of the functions and the like common to the first embodiment will be omitted. In the first embodiment, during the interval time, the fan 34 is maintained in the on state, and all the expansion valves 18 are controlled to be in the open state. In contrast, in the second embodiment, during the interval time, the fan 34 is maintained in the OFF state, the expansion valve 18 that circulates the refrigerant to the indoor unit 30 that is the object of the determination process is controlled to be in the open state, The expansion valve 18 is controlled to be closed. Hereinafter, a description will be given focusing on differences from the first embodiment.

FIG. 6 is a flowchart showing a flow of processing executed by the outdoor side control unit 28 of the second embodiment. First, the outdoor side control part 28 selects the indoor unit 30 in which the determination of a connection state is not complete | finished among several indoor units 30 (step S200).

The outdoor side control unit 28 controls the expansion valve 18 of the indoor unit 30 selected in step S200 to be in an open state (step S202). The outdoor side control part 28 controls the air conditioning system 1 to a standby state for predetermined time (step S204). Next, the outdoor side control part 28 performs the determination process of a connection state (step S206). Since the determination process is the same as that in steps S150 to S168 described in the first embodiment, the description thereof is omitted.

Next, the outdoor side control part 28 determines whether the connection state of all the indoor units 30 was determined (step S208). When the connection state of all the indoor units 30 has not been determined, the process returns to step S200. When the connection states of all the indoor units 30 are determined, the process of this flowchart ends. Thereby, the process performed by this flowchart is complete | finished.

FIG. 7 is a diagram for explaining the outline of the check operation executed by the outdoor side control unit 28 of the second embodiment. For example, the indoor unit 30-1 having the room A as the air-conditioned space, the indoor unit 30-2 having the room B as the air-conditioned space, and the indoor unit 30-3 having the room C as the air-conditioned space are checked. It will be explained as the target of Further, it is assumed that the determination process is executed one by one in the order from room A to room C.

First, the outdoor control unit 28 controls the compressor 12 to be in an ON state, and controls the expansion valve 18-1 for circulating the refrigerant in the indoor unit 30-1 to a predetermined opening state. When the determination process for the room A is completed, the outdoor control unit 28 turns off the compressor 12 and sets the expansion valve 18 of the indoor unit 30-2 to be determined next to the predetermined opening state and the other expansion valves 18. Control to the closed state. After the interval time elapses, the room B determination process is executed, and after the interval time elapses, the room C determination process is executed. In the second embodiment, the fan 34 is controlled to be turned off during the interval time. As a result, the check operation can be executed without making the user present in the room that is the object of the determination process feel that the check operation is being performed.

According to the second embodiment described above, the outdoor control unit 28 indicates that the check operation is being performed to the person existing in the air-conditioning target space in order to maintain the fan 34 in the off state during the interval time. The check operation can be executed without making it feel. Moreover, the outdoor side control part 28 controls the expansion valve 18 which circulates a refrigerant | coolant to the indoor unit 30 used as the object of the determination process in an open state, and controls the other expansion valve 18 in a closed state, so that the refrigerant pipe The following determination process can be executed in a state where the influence of the refrigerant remaining inside is reduced.

In the air conditioning system 1 of the first embodiment and the second embodiment, the determination process during the cooling operation has been described. However, the first embodiment and the second embodiment are also applied during the heating operation. May be. In this case, the outdoor side controller 28 determines whether or not the temperature difference ΔT is equal to or lower than the temperature T1 (ΔT ≦ T1) in Step S152 of the determination process. Moreover, the outdoor side control part 28 determines whether temperature difference (DELTA) Tn is below temperature T2 ((DELTA) Tn <= T2) in step S156 of determination processing. Moreover, the outdoor side control part 28 determines whether temperature TC is more than temperature TCn (TC> = TCn) in step S162 of determination processing.

Further, in the air conditioning system 1 of the first embodiment and the second embodiment, the outdoor side control unit 28 determines in step S152 (determination of whether or not the temperature difference ΔT is equal to or higher than the temperature T1), step S156. (Determining whether or not the temperature difference ΔTn is equal to or higher than the temperature T2 for all other indoor units 30) and the determination in step S162 (determining whether or not the temperature TC is equal to or lower than the temperature TCn). Although described as a thing, the outdoor side control part 28 acquires one or more determination results from each apparatus mentioned above from another apparatus, Based on the acquired determination result, at least one of piping and a communication line is connected correctly It may be determined whether or not it is done. In this case, the other apparatus acquires the detection result of the indoor side heat exchanger temperature sensor 36 included in the indoor unit 30 and the detection result of the indoor side temperature sensor 38, and each step described above based on the acquired detection result. One or more determinations are made, and the determination result is transmitted to the outdoor control unit 28 via a network such as a LAN (Local Area Network).

According to at least one embodiment described above, the first unit has at least a compressor and has an outdoor unit connectable to the refrigerant piping system, a first heat exchanger, and can be connected to the refrigerant piping system. An indoor unit, a second heat exchanger, a second indoor unit connectable to the refrigerant piping system, a first temperature detector for detecting a temperature of the first heat exchanger, A second temperature detector for detecting the temperature of the second heat exchanger; and a third temperature detector provided for the first indoor unit and detecting the temperature of the air-conditioning target space corresponding to the first indoor unit. Temperature detector, a fourth temperature detector provided for the second indoor unit and detecting the temperature of the air-conditioning target space corresponding to the second indoor unit, and the first temperature detector The detected temperature and the third The first temperature difference that is the difference between the temperature detected by the degree detection unit is equal to or greater than the first threshold value, and the temperature detected by the second temperature detection unit and the fourth temperature detection unit are detected. The first temperature unit connected to the first indoor unit among the refrigerant piping systems connected to the first indoor unit when the second temperature difference, which is the difference from the measured temperature, is less than the second threshold value. And a control unit that determines whether at least one of the refrigerant pipe and the first communication line connected to the first indoor unit is correctly connected. Whether or not it is connected can be determined.

Although several embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are also included in the invention described in the claims and the equivalents thereof.

Claims

An outdoor unit having at least a compressor and connectable to a refrigerant piping system;
A first indoor unit having a first heat exchanger and connectable to the refrigerant piping system;
A second indoor unit having a second heat exchanger and connectable to the refrigerant piping system;
A first temperature detector for detecting the temperature of the first heat exchanger;
A second temperature detector for detecting the temperature of the second heat exchanger;
A third temperature detector provided for the first indoor unit and detecting the temperature of the air-conditioning target space corresponding to the first indoor unit;
A fourth temperature detection unit provided for the second indoor unit and detecting the temperature of the air-conditioning target space corresponding to the second indoor unit;
The first temperature difference, which is the difference between the temperature detected by the first temperature detection unit and the temperature detected by the third temperature detection unit, is greater than or equal to a first threshold, and the second temperature. When the second temperature difference, which is the difference between the temperature detected by the detection unit and the temperature detected by the fourth temperature detection unit, is less than the second threshold, it is connected to the first indoor unit. It is determined whether at least one of the first refrigerant pipe connected to the first indoor unit and the first communication line connected to the first indoor unit is correctly connected in the refrigerant pipe system. A control unit,
Air conditioning system with
The control unit determines whether or not a first temperature difference that is a difference between the temperature detected by the first temperature detection unit and the temperature detected by the third temperature detection unit is equal to or greater than a first threshold value. And whether or not a second temperature difference that is a difference between the temperature detected by the second temperature detection unit and the temperature detected by the fourth temperature detection unit is less than a second threshold value. Determine
The air conditioning system according to claim 1.
The control unit determines that the first temperature difference is greater than or equal to the first threshold value after a predetermined time elapses after the first temperature difference is determined to be less than the first threshold value. If the two temperature difference is less than the second threshold value, the first refrigerant pipe connected to the first indoor unit in the refrigerant pipe system and the first communication line connected to the first indoor unit. Determine that at least one of them is connected correctly,
The air conditioning system according to claim 1.
When the control unit determines that the first temperature difference is equal to or greater than a first threshold value and the second temperature difference is equal to or greater than a second threshold value, the control unit performs the first time after a predetermined time has elapsed since the determination. The temperature detected by the first temperature detector provided corresponding to the indoor unit is equal to or lower than the temperature detected by the second temperature detector provided corresponding to the second indoor unit. If it is, it is determined that at least one of the first refrigerant pipe and the first communication line is correctly connected.
The air conditioning system according to claim 3.
The controller is connected to the second refrigerant pipe connected to the second indoor unit and the second indoor unit in the refrigerant pipe system after performing the determination on the first indoor unit. Determining whether at least one of the second communication lines is correctly connected;
The air conditioning system according to claim 4.
A third indoor unit having a third heat exchanger and connectable to the refrigerant piping system;
A fifth temperature detector for detecting the temperature of the third heat exchanger;
A sixth temperature detector provided for the third indoor unit and detecting the temperature of the air-conditioning target space corresponding to the third indoor unit;
The controller is
When it is determined that at least one of the first refrigerant pipe connected to the first indoor unit and the first communication line is correctly connected,
A third temperature difference, which is a difference between the temperature detected by the second temperature detection unit and the temperature detected by the fourth temperature detection unit, is greater than or equal to a first threshold, and the fifth temperature. When the fourth temperature difference, which is the difference between the temperature detected by the detection unit and the temperature detected by the sixth temperature detection unit, is less than the second threshold value, it is connected to the second indoor unit. It is determined that at least one of the second refrigerant pipe connected to the second indoor unit and the second communication line connected to the second indoor unit in the refrigerant pipe system is correctly connected.
The air conditioning system according to claim 1.
When it is determined that at least one of the first refrigerant pipe and the first communication line is correctly connected, the control unit detects the temperature detected by the first temperature detection unit and the third temperature At least one of the second refrigerant pipe connected to the second indoor unit and the second communication line connected to the second indoor unit is correctly connected to the temperature detected by the temperature detector. Not used to determine whether or not
The air conditioning system according to claim 1.
The control unit determines whether at least one of the first refrigerant pipe connected to the first indoor unit and the first communication line connected to the first indoor unit is correctly connected. And after determining about the first indoor unit, it waits for a predetermined time from the determination, and determines whether at least one of the second refrigerant pipe and the second communication line is correctly connected.
The air conditioning system according to claim 5.
The first indoor unit has a first fan for blowing the air heat-exchanged by the first heat exchanger to an air-conditioning target space corresponding to the first indoor unit;
The second indoor unit further includes a second fan for blowing the air heat-exchanged by the second heat exchanger to an air-conditioning target space corresponding to the second indoor unit,
The control unit, after determining the first indoor unit, controls at least the second fan to be on while waiting for a predetermined time from the determination.
The air conditioning system according to claim 1.
A first expansion valve that is provided between the compressor and the first heat exchanger, and that controls a flow rate of refrigerant discharged from the compressor through the first heat exchanger;
A second expansion valve that is provided between the compressor and the second heat exchanger, and that controls a flow rate of the refrigerant discharged from the compressor through the second heat exchanger. ,
The controller controls the first expansion valve and the second expansion valve to be in an open state while waiting for a predetermined time from the determination after determining the first indoor unit.
The air conditioning system according to claim 1.