KR101116679B1 - A multi air conditioner system and a pipe connecting inspection method of the multi air conditioner system - Google Patents

Abstract

The present invention relates to a multi-air conditioner system and a pipe connection check method of the multi-air conditioner system, an object of the present invention is to provide a pipe connection check method of the multi-air conditioner system and the multi-air conditioner system that can be quickly checked the pipe.

In addition, another object of the present invention to provide a multi-air conditioning system and a pipe connection check method of the multi air conditioning system that can increase the reliability of the pipe inspection.

To this end, the present invention provides a multi-air conditioner system including a plurality of indoor units, a plurality of heating and air conditioners having a plurality of heating valves and cooling valve sets for controlling refrigerant flowing in the plurality of indoor units, the plurality of heating valves during operation of the system and Changing the closing state of one of the heating valves and the cooling valve set of the cooling valve set, and confirming the indoor unit is changing the temperature of the heat exchanger side corresponding to the change of the opening and closing state, the indoor unit is changing the temperature of the one heating valve and If the indoor unit is matched with the cooling valve set, the indoor unit whose temperature is changed is determined to be normally connected to the one heating valve and the cooling valve set.

Description

A multi air conditioner system and a pipe connecting inspection method of the multi air conditioner system}             

1 is a view showing a refrigerant passage of a multi-air conditioner system according to an embodiment of the present invention.

FIG. 2 is a block diagram of the multi-air conditioner system shown in FIG.

3 is a flowchart showing an operation according to the first embodiment of the multi-air conditioner system shown in FIGS.

FIG. 4 is a flowchart showing an operation according to the second embodiment of the multi-air conditioner system shown in FIGS. 1 and 2.

[Description of the Reference Numerals]

      10: outdoor unit

20a, 20b, 20c, 20d: first to fourth indoor

30: cooling and heating converter

31a, 31b, 31c, and 31d: first to fourth heating valves                 

32a, 32b, 32c, 32d: first to fourth cooling valves

37a, 37b, 37c, 37d: first to fourth temperature sensors

The present invention relates to a multi air conditioner system and a pipe connection check method of a multi air conditioner system, and more particularly, to a multi air conditioner system and a method for checking a pipe connection of a multi air conditioner system to check whether a refrigerant pipe of a multi air conditioner system is properly connected. will be.

In general, the multi-air conditioner system includes an outdoor unit, a plurality of indoor units connected in parallel to the outdoor unit, a communication line connecting the outdoor unit and the indoor unit, a power line, a refrigerant pipe, and an electric valve installed in the refrigerant pipe.

In the conventional multi-air conditioner system, when the first system is installed, the installer connects the outdoor unit and the plurality of indoor units with communication lines, power lines, and refrigerant pipes, and uses the input means (for example, rotary switches) provided in each indoor unit. By inputting the refrigerant piping number connected to the indoor unit, the outdoor unit microcomputer or indoor unit microcomputer to know the number of the refrigerant piping connected to each indoor unit. However, the multi-air conditioner system has a problem that the refrigerant pipe and the indoor units to be connected to each refrigerant pipe are not easy to check whether the refrigerant pipe and the plurality of indoor units are connected as the installer inputs from the input means.

In order to solve this problem, a method for checking an indoor unit connected to a plurality of refrigerant pipes after the installation of the multi-air conditioner system has been proposed. The method for checking the multi-air conditioner wiring line is disclosed in detail in Korean Patent Publication No. 1991-0008349. .

In the conventional multi-air conditioner system, only one of the electric valves installed in the plurality of refrigerant pipes is opened while the compressor is driven to check the refrigerant pipes connected to each indoor unit, and the temperature change of the indoor unit connected to the refrigerant pipe with the open electric valve is observed. Through this temperature change, the correspondence relationship between the refrigerant pipe and the indoor unit with the open electric valve was confirmed. And by repeating this process it was possible to confirm the connection relationship of the entire refrigerant pipe.

However, the conventional pipe inspection method of the multi-air conditioner system has a problem that it takes a lot of time to check the pipe when there are many indoor units to be inspected because the temperature change of the indoor unit connected to the refrigerant pipe with the open electric valve is progressed slowly.

In addition, there is a case that the temperature change of the indoor unit connected to the refrigerant pipe installed with the open electric valve is not large, there is a problem that the reliability of the pipe inspection is inferior.

The present invention is to solve the above problems, an object of the present invention is to provide a multi-air conditioning system and a pipe connection check method of the multi-air conditioning system that can be quickly checked the pipe.                         

In addition, another object of the present invention to provide a multi-air conditioning system and a pipe connection check method of the multi air conditioning system that can increase the reliability of the pipe inspection.

According to an aspect of the present invention, there is provided a multi-air conditioner system including a plurality of indoor units, a heating and cooling converter having a plurality of heating valves and cooling valve sets for controlling refrigerant flowing in the plurality of indoor units, wherein the system is operated while the system is operating. Changing the closing state of one heating valve and one cooling valve set among a plurality of heating valves and cooling valve sets, checking an indoor unit having a temperature change on the heat exchanger side corresponding to the change of the opening and closing state, and the indoor unit changing the temperature is When the indoor unit is matched with one heating valve and one cooling valve set, the indoor unit having the temperature change may be determined to be normally connected to the one heating valve and the cooling valve set.

In addition, if the indoor unit of the temperature change is not the indoor unit matched with the one heating valve and the cooling valve set, the indoor unit changing the temperature is characterized in that it is determined that the connection with the one heating valve and the cooling valve set wrong.

In addition, a plurality of indoor units, a plurality of refrigerant pipes for supplying the refrigerant delivered from the outdoor unit to the indoor unit or the refrigerant discharged from the indoor unit to the outdoor unit, and control the flow of the refrigerant pipe and open when the indoor unit is in the cooling operation In the pipe connection check method of a multi-air conditioner system including a plurality of air-conditioning valve having a plurality of air-conditioning valve and a plurality of heating valve which is opened when the indoor unit is a heating operation, closing the plurality of heating valves and the plurality of cooling The compressor is driven while all the valves are opened, and one of the plurality of heating valves is opened to close the cooling valve formed with the heating valve, and the change in temperature measured at the plurality of heat exchangers is determined. Heating valves and cooling valve sets and valves If the indoor unit pipe between the indoor unit and the heating valve and cooling valve set is characterized in that it determines that the top is connected.

In addition, if the indoor unit having a change in temperature measured at the plurality of heat exchanger sides is more than a reference range, and the indoor unit other than the indoor unit matched with the heating valve and the cooling valve set that changed the opening and closing state, the piping between the indoor unit and the heating valve and the cooling valve set Is determined to be connected incorrectly.

In addition, the temperature measured at the heat exchanger side of the plurality of indoor units is characterized in that the temperature measured by a temperature sensor installed in the pipe connecting the plurality of indoor units and the air-conditioning converter.

In addition, the temperature of the heat exchanger side is characterized by measuring before and after changing the opening and closing state of the heating valve and the cooling valve set, respectively.

In addition, the change amount of the temperature measured in the heat exchanger is characterized in that the increase in the temperature measured in the heat exchanger.

In addition, the pipe connection check method is characterized in that it is performed sequentially for the entire plurality of heating valve and cooling valve set.

In addition, a plurality of indoor units, a plurality of refrigerant pipes for supplying the refrigerant delivered from the outdoor unit to the indoor unit or the refrigerant discharged from the indoor unit to the outdoor unit, and the flow of the refrigerant pipe to adjust the flow of the indoor unit when the cooling operation A pipe connection checking method of a multi-air conditioner system having a plurality of air conditioning valves having a plurality of air-conditioning valves to be opened and a plurality of heating valves to be opened when the indoor unit is in a heating operation, wherein the plurality of air-conditioning valves are closed and the plurality of air-conditioning systems are closed. The compressor is operated while all the heating valves are opened, and one of the plurality of cooling valves is opened to close the heating valve that is set with the cooling valve, and the change amount of temperature measured at the plurality of heat exchangers. Heating valves and air conditioning valve sets and valves If the indoor unit pipe between the indoor unit and the heating valve and cooling valve set is characterized in that it determines that the top is connected.

In addition, if the indoor unit having a change in temperature measured at the plurality of heat exchanger sides is more than a reference range, and the indoor unit other than the indoor unit matched with the heating valve and the cooling valve set that changed the opening and closing state, the piping between the indoor unit and the heating valve and the cooling valve set Is determined to be connected incorrectly.

In addition, the temperature measured at the heat exchanger side of the plurality of indoor units is characterized in that the temperature measured by a temperature sensor installed in the pipe connecting the plurality of indoor units and the air-conditioning converter.

In addition, the temperature of the heat exchanger side is characterized by measuring before and after changing the opening and closing state of the heating valve and the cooling valve set, respectively.

In addition, the change amount of the temperature measured in the heat exchanger is characterized in that the fall amount of the temperature measured in the heat exchanger.                     

In addition, the pipe connection check method is characterized in that it is performed sequentially for the entire plurality of heating valve and cooling valve set.

In addition, the plurality of indoor units and the refrigerant delivered from the outdoor unit to the indoor unit or a plurality of refrigerant pipes to send the refrigerant discharged from the indoor unit to the outdoor unit, the flow of the refrigerant pipe is adjusted, and the indoor unit is opened when the cooling operation A cooling and heating converter having a plurality of cooling valves and a plurality of heating valves that are opened when the indoor unit is heating operation, a plurality of temperature sensors for measuring the temperature of the heat exchanger side of the plurality of indoor units, the refrigerant flowing into one indoor unit of the plurality of indoor units It characterized in that it comprises a control unit for checking the piping connection between the heating valve and the cooling valve set and the one indoor unit by checking the indoor unit temperature is changed in accordance with the opening and closing state of the heating valve and cooling valve set to adjust the .

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. As shown in FIG. 1, the multi-air conditioner system according to an exemplary embodiment of the present invention includes an outdoor unit 10, first to fourth indoor units 20a, 20b, 20c, and 20d connected in parallel to the outdoor unit 10, and each indoor unit ( 20a, 20b, 20c, and 20d) includes a cooling and heating converter 30 for switching the operation mode to the cooling mode or the heating mode.

The outdoor unit 10 includes a four-way valve 12 that determines a flow direction of the refrigerant discharged from the compressor 11, an outdoor heat exchanger 13 that performs heat exchange by outdoor air introduced into the outdoor unit 10, and a refrigerant. An outdoor electric valve 14 for expansion, a receiver tank 15 and an accumulator 16 for separating gaseous and liquid refrigerant from each other, and each indoor unit 20a, 20b, 20c, 20d and The outdoor unit 10 delivers the refrigerant through the high pressure gas pipe 17, the low pressure gas pipe 18, and the high pressure liquid pipe 19.

In the outdoor unit 10, the low pressure gas pipe 18 is connected to the suction side of the compressor 11 through the accumulator 16, and the outdoor heat exchanger 13 and the outdoor electric valve 14 are connected in series. The high pressure liquid pipe 19 is connected to the outdoor transmission valve 14 via the receiver tank 15. The bypass valve 41a which functions as a flow control valve is connected to the electric valve 14 in parallel with the check valve 41b, and the liquid refrigerant from the outdoor heat exchanger 13 is bypass valve 41a during the cooling operation. ) And the check valve (41b) to bypass the outdoor electric valve 14, and during the heating operation bypass valve 41a is closed to allow the refrigerant to pass through the outdoor electric valve (14). .

Between the four-way valve 12 and the high pressure liquid pipe 19, there is a high-pressure branch pipe 42 branched from the high-pressure gas pipe 17, the high-pressure branch pipe 42 has a solenoid valve 43a which functions as an open / close valve and a high pressure. The check valve 43b which prevents the backflow of the refrigerant from the gas pipe 42 side is provided. Another check valve 44 is provided between the four-way valve 12 and the high pressure liquid pipe 19 to prevent the backflow of the refrigerant.

Meanwhile, the first to fourth indoor units 20a, 20b, 20c, and 20d are the first to fourth indoor heat exchangers 21a, 21b, 21c, and 21d, and the first to fourth indoor heat exchangers 21a, 21b, First to fourth indoor electric motors 22a, 22b, 22c, and 22d connected in series with 21c and 21d, and the first to fourth devices installed between the indoor units 20a, 20b, 20c, and 20d and the air conditioner 30, respectively. Four temperature sensors 37a, 37b, 37c, and 37d.

The air-conditioning converter 30 is provided with the first to fourth heating valves 31a, 31b, 31c, and 31d installed in the first to fourth high pressure gas branch pipes 33a, 33, 33c, and 33d branched from the high pressure gas pipe 17. And first to fourth cooling valves 32a, 32b, 32c, and 32d provided in the first to fourth low pressure gas distributors 34a, 34b, 34c, and 34d branched from the low pressure gas pipe 18. In addition, the first heating valve and the cooling valve set is connected to the first refrigerant pipe (35a) connected to the first indoor heat exchanger (20a), the second to fourth heating valve and the cooling valve set are sequentially second to third Four refrigerant pipes (35b, 35c, 35d) are connected.

As shown in FIG. 2, in the multi-air conditioner system according to the exemplary embodiment of the present invention, the outdoor unit 10 further includes an outdoor unit microcomputer 23 that controls each device of the outdoor unit 10 in addition to the device shown in FIG. 1. .

In addition, the first to fourth indoor units 20a, 20b, 20c, and 20d further include first to fourth indoor microcomputers 36a, 36b, 36c, and 36d for controlling the devices of the indoor units.

In addition, the air-conditioning converter 30 controls the first to fourth cooling valves 32a, 32b, 32c, and 32d and the first to fourth heating valves 31a, 31b, 31c, and 31d. More).

Referring to Fig. 3, the operation according to the first embodiment of the multi-air conditioner system shown in Figs. 1 and 2 will be described. When installing the multi-air conditioner system, the installer connects pipes between the outdoor unit 10, the plurality of indoor units 20a, 20b, 20c, and 20d and the air-conditioning and switching unit 30, and uses each input unit to input the indoor units 20a and 20b. Enter the number of branches (not shown) of the air conditioner 30 connected to, 20c, 20d.

At this time, the basin is a hole provided in the case of the air conditioner 30 to allow the pipes connecting the indoor units 20a, 20b, 20c, and 20d to the heating and heating diverter 300 to the heating valve and the cooling valve set. The number is the same as the number of pipes passing through the basin and the number of heating and cooling valve sets connected to the pipe, for example, if the basin to which the indoor unit 1 is connected is the first branch, pass through the first branch. The pipe is a first pipe, and the valve connected to the first pipe is the first heating valve and the first cooling valve.

In addition, the above input means may be used a variety of means, for example, by installing a rotary switch in each indoor unit, the rotary switch to point the number of the basin to which the indoor unit is connected to the minute that the microcomputer of the indoor unit is connected to the indoor unit Make sure you know the district number (ie, number of heating and cooling valve sets, piping number). In addition, when the indoor unit microcomputer grasps the number of the basin to which the indoor unit is connected, it communicates data with the air conditioner microcomputer so that the address of the indoor unit connected to each heating valve and the cooling valve set can be obtained from the heating / cooling converter microcomputer. In this embodiment, the first chamber 20a is input to the first heating valve and the cooling valve set, and the second to fourth chambers 20b, 20c, and 20d are sequentially connected to the second to fourth heating valve and the cooling valve set. ) Is entered as connected.

When the input of the connection relationship between each valve of the air conditioner 30 and each indoor unit is completed, all the heating valves of the air conditioner 30 are operated while operating all the indoor units 20a, 20b, 20c, and 20d in the cooling mode (50). (31a, 31b, 31c, 31d) are closed, and all cooling valves 32a, 32b, 32c, 32d of the air conditioner 30 are opened (52).

And each temperature sensor (37a, 37b, 37c, 37d) measures the temperature near each indoor unit heat exchanger and waits until the measured temperature stabilizes (54). When the temperature measured by the heat exchanger temperature sensors 37a, 37b, 37c, 37d is stabilized, the air conditioner microcomputer 38a opens the first heating valve 31a and closes the first cooling valve 32a (56, 58).

When the opening and closing states of the first heating valve and the cooling valve set are changed and a predetermined time elapses, the measured values of the respective temperature sensors 37a, 37b, 37c, and 37d are checked to determine the temperature increase near the first indoor heat exchanger 21a. Calculate (60). Here, the predetermined time may vary depending on the system and is preferably set to a time at which the temperature rise can be sufficiently detected.

As described above, the low-temperature low-pressure liquid refrigerant is supplied to the indoor unit connected to the first heating valve and the cooling valve set through the first cooling valve 32a, and then the first cooling valve 32a is closed and the first heating valve 31a is closed. When the high-temperature, high-pressure gas refrigerant is supplied to the indoor unit connected to the first heating valve and the cooling valve set, the temperature difference of the refrigerant is large, and thus the amount of temperature change detected by the temperature sensors 37a, 37b, 37c, and 37d also increases. Can be easily identified.

Next, it is determined whether the indoor unit in which the temperature rises above the reference range is the first indoor unit 20a (62). If the temperature of the first indoor unit 20a rises above the reference range, the first indoor unit 20a, the first heating valve, and the cooling valve The connection between the sets is determined to be normal (64). At this time, the reference range is provided to exclude the case in which the temperature rises due to factors other than the change of the open / close state of the valve, and an appropriate value can be selected by experiment.

If it is determined that the pipe connection between the first indoor unit 20a and the first heating valve and the cooling valve set is normal, it is determined whether all the connection relations have been checked (66). Check the pipe connection by changing the open / closed state of the set (68).

If the indoor unit whose temperature rises above the reference range in step 62 is not the first indoor unit 20a, it is determined that the pipe connection between the first indoor unit 20a, the first heating valve and the cooling valve set is incorrect, and the display unit (not shown). Warning sign through (72).

If the pipe connection between the first chamber 20a, the first heating valve and the cooling valve set is incorrect, the pipe between the first chamber 20a and the first heating valve and the cooling valve set matched by the installer is not connected by piping. 1 When other indoor unit is connected to heating valve and cooling valve set.

An operation according to a second embodiment of the multi-air conditioner system shown in FIGS. 1 and 2 will be described with reference to FIG. When installing the multi-air conditioner system, the installer connects the outdoor unit 10, the plurality of indoor units 20a, 20b, 20c, 20d and the air conditioner 30 with pipes, and uses the input means for each indoor unit 20a, 20b. Enter the branch number (ie, the number of the heating valve and the cooling valve set associated with the branch) of the air conditioner 30 connected to the 20c, 20d.

When the input of the connection relationship between each valve of the air conditioner 30 and each indoor unit 20a, 20b, 20c, 20d is completed, all indoor units 20a, 20b, 20c, 20d are operated while in heating mode (80). All air conditioning valves 32a, 32b, 32c, and 32d of the air conditioner 30 are closed, and all heating valves 31a, 31b, 31c, and 31d of the air conditioner 30 are opened (82).

Then, the temperature sensors 37a, 37b, 37c, and 37d measure the temperature near each indoor unit heat exchanger and wait until the measured temperature stabilizes (84). When the temperature measured by the heat exchanger temperature sensors 37a, 37b, 37c, 37d is stabilized, the air conditioning heater microcomputer 38 opens the first air valve 32a and closes the first heat valve 31a (88). .

Change the opening / closing state of the first heating valve and cooling valve set, and after a predetermined time passes, check the measured values of the temperature sensors 37a, 37b, 37c, and 37d to calculate the temperature drop near the first indoor heat exchanger. (90). Here, the predetermined time may vary depending on the system, and it is preferable to set the time to be enough to sense the temperature drop.

As above, the high temperature and high pressure gas refrigerant is supplied to the indoor unit connected to the first heating valve and the cooling valve set through the first heating valve 31a, the first heating valve is closed, and the low temperature and low pressure liquid refrigerant is provided through the first cooling valve. When supplying to the indoor unit connected to the first heating valve and the cooling valve set, because the temperature difference of the refrigerant is large, the amount of temperature change detected by the temperature sensor also increases, it is easy to determine whether the temperature change.

Next, it is determined whether the indoor unit having the temperature lowered by the reference range is greater than or equal to the first indoor unit 20a (92). If the temperature of the first indoor unit 20a is lowered by the standard range or higher, the first indoor unit 20a, the first heating valve, and the air conditioner are cooled. The connection between the valve sets is determined to be normal (94). At this time, the reference range is provided to exclude the case where the temperature is lowered by other factors than the change of the open / closed state of the valve, and an appropriate value can be selected by experiment.

If it is determined that the pipe connection between the first indoor unit 20a and the first heating valve and the cooling valve set is normal, it is determined whether all the connection relations have been checked (96). Check the pipe connection by changing the open / closed state of the set (98).

If the indoor unit whose temperature falls below the reference range in step 92 is not the first chamber 20a, it is determined that the pipe connection between the first chamber 20a, the first heating valve and the cooling valve set is incorrect, and a warning is displayed through the display unit. (100, 102).

If the pipe connection between the first chamber 20a, the first heating valve and the cooling valve set is incorrect, the pipe between the first chamber 20a and the first heating valve and the cooling valve set matched by the installer is not connected by piping. 1 When other indoor unit is connected to heating valve and cooling valve set.

As described in detail above, the present invention checks the pipe connection by using the temperature change before and after changing the opening and closing state of the heating valve and the cooling valve set, so that the temperature change time is faster, so that the pipe connection can be quickly checked.

In addition, since the temperature change amount before and after changing the opening and closing state of the heating valve and the cooling valve set is easy to determine whether the temperature change can increase the reliability of the pipe connection inspection.

Claims (21)

A plurality of refrigerant pipes for supplying an outdoor unit, a plurality of indoor units, the refrigerant delivered from the outdoor unit to the indoor unit or the refrigerant discharged from the indoor unit to the outdoor unit, a plurality of cooling valves and the indoor unit opened when the indoor unit is a cooling operation Is a heating and cooling converter for controlling the flow of the refrigerant on the refrigerant pipe located between the outdoor unit and the indoor unit through a plurality of heating valves open when the heating operation, wherein the cooling valve and the heating valve is a set of each indoor unit In the pipe connection check method of the multi air conditioning system connected to the connected refrigerant pipe, Operating the plurality of indoor units simultaneously in a cooling mode; Operating a first indoor unit of the plurality of indoor units operating in the cooling mode in a heating mode; Determining that the first indoor unit is normally connected when the temperature change detected by the first indoor unit is equal to or greater than a preset value as a result of switching to the heating mode; And a change in temperature detected by another indoor unit as a result of switching to the heating mode, determining that the first indoor unit is abnormally connected. The method of claim 1, In order to perform a pipe connection check of the other indoor units by sequentially operating the other indoor unit in the heating mode and determining whether the temperature change of the other indoor unit detected as a result of switching from the cooling mode to the heating mode is more than a preset value. How to check the piping connection of the air conditioning system. A plurality of refrigerant pipes for supplying an outdoor unit, a plurality of indoor units, the refrigerant delivered from the outdoor unit to the indoor unit or the refrigerant discharged from the indoor unit to the outdoor unit, a plurality of cooling valves and the indoor unit opened when the indoor unit is a cooling operation Is a heating and heating converter for controlling the flow of the refrigerant on the refrigerant pipe located between the outdoor unit and the indoor unit through a plurality of heating valves open when the heating operation, wherein the air conditioning valve and the heating valve is a set of each indoor unit In the pipe connection check method of the multi air conditioning system connected to the refrigerant pipe connected with Operating the plurality of indoor units simultaneously in a heating mode; Operating a first indoor unit of the plurality of indoor units operating in the heating mode in a cooling mode; Determining that the first indoor unit is normally connected when the temperature change detected by the first indoor unit is equal to or greater than a preset value as a result of switching to the cooling mode; If the change in temperature detected by the other indoor unit is greater than the predetermined value as a result of switching to the cooling mode, the pipe connection check method of the multi-air conditioner system determines that the first indoor unit is abnormally connected. The method of claim 3, In order to perform a pipe connection check of the other indoor units by sequentially operating the other indoor units in the cooling mode and determining whether the temperature change of the other indoor units detected as a result of switching from the heating mode to the cooling mode is more than a preset value. How to check the piping connection of the air conditioning system. A plurality of refrigerant pipes for supplying an outdoor unit, a plurality of indoor units, the refrigerant delivered from the outdoor unit to the indoor unit or the refrigerant discharged from the indoor unit to the outdoor unit, a plurality of cooling valves and the indoor unit opened when the indoor unit is a cooling operation Is a heating and cooling converter for controlling the flow of the refrigerant on the refrigerant pipe located between the outdoor unit and the indoor unit through a plurality of heating valves open when the heating operation, wherein the air conditioning valve and the heating valve is a set of each indoor unit In the pipe connection check method of the multi-air conditioner system connected to the refrigerant pipe on the side, Operate the air-conditioning valve and the heating valve set such that all indoor units are operated in the first mode at the same time; Changing an opening / closing state of a cooling valve and a heating valve set corresponding to the first indoor unit such that a first indoor unit of the plurality of indoor units operating in the first mode is operated in a second mode; In response to a change from the first mode to the second mode of the first indoor unit, the opening / closing state of the air conditioning valve and the heating valve set is changed. Determine that is normally installed; The first indoor unit is abnormal when a temperature change of a predetermined value or more is detected in another indoor unit as a result of changing the opening / closing state of the cooling valve and the heating valve set in response to the change from the first mode to the second mode of the first indoor unit. How to check the pipe connection of the multi air conditioning system to determine that the installation. The method of claim 5, The cooling valve and heating valve set In the first mode the cooling valve is opened, the heating valve is closed, in the second mode the cooling valve is closed, the heating valve is opened, And the cooling valve is closed in the first mode, the heating valve is opened, the cooling valve is opened in the second mode, and the heating valve is closed. The method according to claim 5 or 6, If the indoor unit having the heat exchanger in which the temperature change is detected does not match the cooling valve and heating valve set in which the open / close state is changed, the indoor unit and the cold valve and heating valve set in which the open / close state is changed in the temperature change is detected. How to check the pipe connection of a multi air conditioner system to determine that the connection is abnormal. The method of claim 5, Driving the compressor in a state in which all of the plurality of heating valves are closed and all of the plurality of cooling valves are opened; Closing a cooling valve constituting the heating valve while opening one heating valve among the plurality of heating valves; When the indoor unit having a heat exchanger whose measured temperature change is greater than the reference range is matched with a heating valve and a cooling valve set whose opening / closing state is changed, the connection between the indoor unit and the heating valve and cooling valve set is determined to be normal. How to check the connection. The method of claim 5, And a temperature measured by the plurality of indoor units is a temperature measured by a temperature sensor installed in a pipe connecting the plurality of indoor units and the air conditioning unit. 10. The method of claim 9, The temperature measured at the plurality of indoor unit side is measured before and after changing the opening and closing state of the heating valve and the cooling valve set, respectively. The method of claim 5, The temperature change measured by the plurality of indoor unit side is the pipe connection check method of the multi-air conditioner system, characterized in that the increase in the temperature measured on the indoor unit side. The method of claim 5, Driving the compressor in a state in which all of the plurality of cooling valves are closed and all of the plurality of heating valves are opened; Closing a heating valve that is set with the cooling valve while opening one cooling valve among the plurality of cooling valves; When the indoor unit having a heat exchanger whose measured temperature change is greater than the reference range is matched with a heating valve and a cooling valve set whose opening / closing state is changed, the connection between the indoor unit and the heating valve and cooling valve set is determined to be normal. How to check the connection. The method of claim 12, The temperature change measured by the plurality of indoor unit side is a pipe connection check method of the multi-air conditioner system, characterized in that the falling amount of the temperature measured on the indoor unit side. The method according to claim 8 or 12, wherein The pipe connection check method is a pipe connection check method of the multi-air conditioning system, characterized in that performed sequentially for a plurality of heating valve and cooling valve set. Outdoor unit; A plurality of indoor units each including a temperature sensor for measuring temperature; A plurality of refrigerant pipes supplying the refrigerant delivered from the outdoor unit to the indoor unit or sending the refrigerant discharged from the indoor unit to the outdoor unit; And a plurality of cooling valves and heating valves that are independently opened and closed to control the refrigerant flow in the refrigerant pipe between the outdoor unit and each indoor unit, wherein the cooling valve and the heating valve form a set of refrigerant on each indoor unit side. Heating and cooling converter connected to the pipe; It includes a control unit for controlling each indoor unit having a heat exchanger having a temperature that changes according to the opening and closing state of the cooling valve and heating valve for controlling the refrigerant flow between the outdoor unit and the indoor unit, The control unit operates the plurality of indoor units simultaneously in the first mode, operates the first indoor unit of the plurality of indoor units by changing to the second mode, and operates the first indoor unit by changing from the first mode to the second mode. If the indoor unit detects a change in temperature greater than or equal to a preset value, it is determined that the first indoor unit is normally connected, and when the operation is performed by changing from the first mode to the second mode, if the change in temperature is greater than a preset value in another indoor unit, 1 Multi-air conditioning system that determines that the indoor unit is abnormally connected. The method of claim 15, And the first mode is a cooling mode, and the second mode is a heating mode. The method of claim 16, The control unit simultaneously operates the plurality of indoor units in the first mode by opening all cooling valves of the plurality of indoor units and closing all heating valves. Closing the cooling valve and opening the heating valve to operate the first indoor unit in a second mode. The method of claim 15, And wherein the first mode is a heating mode and the second mode is a cooling mode. The method of claim 18, The control unit simultaneously operates the plurality of indoor units in the first mode by opening all heating valves of the plurality of indoor units and closing all cooling valves. And operating the first indoor unit in a second mode by closing the heating valve and opening the cooling valve. The method of claim 16, The control unit sequentially checks the pipe connection of the other indoor unit by determining whether the temperature change of the other indoor unit detected as a result of the operation of the other indoor unit in the heating mode and switching from the cooling mode to the heating mode is greater than or equal to a preset value. Hager is a multi-air conditioning system. The method of claim 19, The control unit sequentially checks the pipe connection of the other indoor unit by determining whether the temperature change of the other indoor unit detected as a result of the operation of the other indoor unit in the cooling mode and switching from the heating mode to the cooling mode is greater than or equal to a preset value. Multi-air conditioning system.

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