KR101270540B1 - Apparatus for inspecting refrigerant pipe connection of multi pipe air conditioner and method thereof - Google Patents

Abstract

The present invention relates to a pipe connection check apparatus and a method of a multi-type air conditioner, and to accurately check the pipe connection of the outdoor unit and the indoor unit to improve the pipe inspection error that may occur when the indoor unit volume is large.

To this end, the present invention is a multi-type air conditioner including an outdoor unit and a plurality of indoor units connected to a plurality of pipes to the outdoor unit, and a plurality of EEVs corresponding to the plurality of indoor units are provided to check the pipe connection of the outdoor unit and the plurality of indoor units. In the pipe connection checking method, the compressor is operated when the EEV corresponding to each of the plurality of indoor units is opened, the respective pipe temperature difference is detected before and after the EEV opening by the compressor operation, and the detected pipe temperature difference is determined as a predetermined reference temperature. When the pipe temperature difference is within the reference temperature range, the compressor is operated by changing the compressor frequency and detecting a pipe temperature difference of the indoor unit by the compressor frequency change operation to check the pipe connection for matching the plurality of indoor units with the EEV. .

Description

Apparatus for inspecting refrigerant pipe connection of multi pipe air conditioner and method

1 is a refrigerant flow path of a multi-type air conditioner to which the present invention is applied;

2 is a control block diagram of a pipe connection check apparatus of a multi-type air conditioner according to an embodiment of the present invention;

3A and 3B are an operation flowchart of a pipe connection checking method of a multi-type air conditioner according to the present invention;

Figure 4 is a load operation timing diagram in the cooling pipe check mode of the multi-type air conditioner according to the present invention.

Description of the Related Art [0002]

10: outdoor unit 11: compressor

12: four-way valve 13: outdoor heat exchanger

14: Outdoor fan 15A, 15B, 15C, 15D: EEV

20A, 20B, 20C, 20D: Indoor unit 21A, 21B, 21C, 21D: Indoor heat exchanger

22A, 22B, 22C, 22D: Indoor fan 23A, 23B, 23C, 23D: Piping temperature sensor

32: control unit

The present invention relates to a multi-type air conditioner connecting a plurality of indoor units to one outdoor unit, and more particularly, to a pipe connection checking apparatus and a method of a multi-type air conditioner for accurately checking the pipe connection of the outdoor unit and the indoor units.

In general, an air conditioner is a device used for cooling or heating a room, and a conventional refrigeration cycle in which refrigerant is circulated between the indoor unit and the outdoor unit is applied to absorb ambient heat when the liquid refrigerant evaporates. The cooling or heating operation is performed by the characteristic of releasing heat when liquefied.

In general, an air conditioner installs one indoor unit in one outdoor unit, but recently, a multi-type air conditioner connects a plurality of indoor units to one outdoor unit to independently perform cooling or heating operations. Increasingly, user demand for multi system air conditioners is increasing.

The multi-type air conditioner is configured to circulate a refrigerant by connecting a refrigerant pipe between the outdoor unit and the plurality of indoor units, and can be generally classified into a single pipe and a multi pipe according to the refrigerant pipe connection type of the outdoor unit and the indoor units. The single pipe has a structure in which one refrigerant pipe connected to the outdoor unit is branched into a plurality of refrigerant pipes through a branch device and connected to each indoor unit. In the multi-pipe, a one-to-one pipe is formed between the outdoor unit and each indoor unit without a separate branch device, and the refrigerant circulates independently between the outdoor unit and the indoor unit. That is, the number of indoor unit refrigerant pipes are connected to the outdoor unit, and one indoor unit is connected to each refrigerant pipe.

In the multi-pipe multi-type air conditioner, an electronic expansion valve (hereinafter referred to as an "EVE") corresponding to each indoor unit is installed in the refrigerant pipes connected by the number of indoor units, respectively, to match the refrigerant pipe connection between the outdoor unit and the indoor units.

Therefore, conventionally, during the initial installation or transfer, the outdoor unit is cooled and operated to check the pipe connection between the outdoor unit and the indoor unit, and before starting by starting the operation to open only the EEV corresponding to the indoor unit subject to the pipe connection inspection (the remaining EEV is closed). If the pipe temperature difference is about 8 ℃ or more after the piping temperature and the start (after about 3 ~ 4 minutes), it is judged that the pipe connection is properly performed.After checking the connection of one indoor unit pipe, the cooling pipe which sequentially checks the pipe connection of the next indoor unit Run the check mode.

However, in the conventional air conditioner pipe inspection mode of the multi-type air conditioner, if the indoor unit volume is large, the difference between the pipe temperature before starting and the pipe temperature after starting may be less than 8 ° C. There is a problem that may occur.

Therefore, the present invention is to solve the conventional problems as described above, the object of the present invention is that if the pipe temperature difference before and after the start in the cooling pipe inspection mode for checking the piping connection of the outdoor unit and the indoor unit by the cooling operation. The present invention provides a pipe connection inspection device and a method of a multi-type air conditioner that can improve the pipe inspection error that may occur when the indoor unit volume is large by rechecking the pipe connection by changing the compressor frequency.

In order to achieve the above object, the present invention is a multi-type having an outdoor unit, a plurality of indoor units connected to the multi-pipe to the outdoor unit, a plurality of EEV corresponding to each of the plurality of indoor units is provided to check the pipe connection of the outdoor unit and the plurality of indoor units In the pipe connection check method of the air conditioner, the compressor is operated when the EEV corresponding to each of the plurality of indoor units is opened, the respective pipe temperature difference is detected before and after the EEV opening by the compressor operation, and the detected pipe temperature difference is determined. When the pipe temperature difference is a reference temperature range compared to a predetermined reference temperature, the compressor is operated by changing the compressor frequency and detecting the indoor unit piping temperature difference by the compressor frequency changing operation to connect the pipes for matching the plurality of indoor units with the EEV. It is characterized by checking.

The operation of the compressor when the EEVs corresponding to the plurality of indoor units are opened may include opening only the EEV corresponding to any one indoor unit so as to supply refrigerant to any one of the plurality of indoor units. Characterized in that the operation at the specified pipe inspection mode frequency.

In addition, detecting each indoor unit piping temperature difference before and after opening the EEV by the compressor operation is performed by opening only the EEV corresponding to any one indoor unit of the plurality of indoor units while the fans of all indoor units are operated by the outdoor unit cooling operation. And detecting a change in the indoor unit piping temperature before the EEV opening and the indoor unit piping temperature after the EEV opening.

In addition, the reference temperature range is characterized in that less than about 4 ~ 8 ℃.

In addition, the operation by changing the compressor frequency is characterized by further increasing the compressor frequency by a predetermined frequency to further perform a cooling operation for the pipe inspection of each indoor unit.

In addition, the predetermined frequency is characterized in that about 5Hz or more.

In addition, checking the pipe connection for matching the plurality of indoor units and the EEV detects the indoor unit pipe temperature before the EEV opening and the indoor unit pipe temperature difference after the compressor frequency change operation, and detects the detected pipe temperature difference with a predetermined reference temperature difference. In comparison, when the pipe temperature difference is greater than or equal to the reference temperature difference, it is determined that the pipe connection of the indoor unit is properly performed, and when the pipe temperature difference is less than the reference temperature difference, a pipe inspection error of the indoor unit is generated to check the plurality of indoor unit pipe connections. do.

And, the present invention is an outdoor unit; A plurality of indoor units connected to a plurality of pipes to the outdoor unit; A plurality of EEVs provided to correspond to the plurality of indoor units, respectively; A compressor to operate when the EEVs corresponding to the plurality of indoor units are opened; And detecting each indoor unit pipe temperature difference between before and after opening of the EEV, and comparing the detected pipe temperature difference with a predetermined reference temperature to change the compressor frequency when the pipe temperature difference is within a reference temperature range. And a controller for checking a pipe connection for matching.

The control unit may open only the EEV corresponding to any one of the indoor units of the plurality of indoor units, and operate the compressor at a predetermined pipe inspection mode frequency, and the indoor unit piping temperature before the EEV opening and the indoor unit piping after the EEV opening. By detecting a temperature change, the outdoor unit and the plurality of indoor unit pipe connections may be checked.

The control unit may further perform a cooling operation to increase the compressor frequency when the pipe temperature difference is within a reference temperature range to detect a change in the indoor unit pipe temperature before opening the EEV and an indoor unit pipe temperature change after the compressor frequency change operation. And a plurality of indoor unit pipe connection check.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a refrigerant flow diagram of a multi-type air conditioner according to the present invention, which will be described by taking an example in which four indoor units 20A, 20B, 20C, and 20D are connected to one outdoor unit 10.

1, the multi-type air conditioner of the present invention includes one outdoor unit 10 and a plurality of indoor units 20A, 20B, 20C, and 20D connected in parallel to the outdoor unit 10, and the plurality of indoor units 20A and 20B. The refrigerant pipe is connected between the 20C, 20D and the outdoor unit 10.

The outdoor unit 10 includes four EEVs corresponding to the compressor 11, the four-way valve 12, the outdoor heat exchanger 13, the outdoor fan 14, and the four indoor units 20A, 20B, 20C, and 20D, respectively. 15A, 15B, 15C, 15D and accumulator 16, and each indoor unit 20A, 20B, 20C, 20D includes an indoor heat exchanger 21A, 21B, 21C, 21D and an indoor fan 22A, 22B, 22C. And 22D) and pipe temperature sensors 23A, 23B, 23C, and 23D, respectively.

The compressor 11 is an inverter-type compressor that compresses a refrigerant in a low temperature low pressure gas state to be sucked and discharges the refrigerant in a high temperature high pressure gas state.

The four-way valve 12 is a high-temperature, high-pressure gas refrigerant discharged from the compressor 11 is transferred to the indoor heat exchangers (21A, 21B, 21C, 21D) during the heating operation to the outdoor heat exchanger (13) during the cooling operation. It has two independent passages, and the on / off switching operation to change the flow of the refrigerant in accordance with the mode of cooling operation and heating operation according to the user's choice.

The outdoor heat exchanger 13 serves as a condenser for condensing a refrigerant in a high temperature and high pressure gas state to a high temperature and high pressure liquid state in a heating operation mode, and in a cooling operation mode, a refrigerant in a low temperature low pressure liquid state in a gas state. It acts as an evaporator to evaporate, thereby exchanging heat with ambient air in response to the enthalpy change of the refrigerant.

The outdoor fan 14 plays a catalytic role of promoting heat exchange between the refrigerant flowing in the outdoor heat exchanger 13 and the air, thereby increasing the heat exchange capacity of the outdoor unit 10.

The EEV (15A, 15B, 15C, 15D) is installed between the outdoor heat exchanger 13 and the indoor heat exchanger (21A, 21B, 21C, 21D) is a low-temperature low-pressure refrigerant at room temperature and high pressure liquid state condensed from any one side As a two-phase refrigerant in which a liquid component and a gas component are mixed, the pressure is reduced.

The accumulator 16 is installed on the suction side of the compressor 11 to convert the refrigerant sucked into the compressor 11 into gas in a completely gaseous state.

The indoor heat exchangers 21A, 21B, 21C, and 21D, as opposed to the outdoor heat exchanger 13, exchange heat with the surrounding air as a condenser during heating operation and an evaporator during cooling operation.

The indoor fans 22A, 22B, 22C, and 22D promote heat exchange between the refrigerant flowing through the indoor heat exchangers 21A, 21B, 21C, and 21D and air, and generate cold or warm air required for the room.

The pipe temperature sensors 23A, 23B, 23C, and 23D are indoor heat exchangers 21A, 21B, 21C, to sense the inlet temperature of the indoor heat exchangers 21A, 21B, 21C, 21D, which act as evaporators during cooling operation. 21D) is a temperature sensor installed on the inlet side of the EEV (15A, 15B, 15C, 15D) in the cooling piping inspection mode to check the piping connection between the outdoor unit 10 and each indoor unit (20A, 20B, 20C, 20D). The change in inlet pipe temperature of each indoor heat exchanger (21A, 21B, 21C, 21D) according to the opening degree is sensed.

In the multi-type air conditioner configured as described above, in the cooling operation and the heating operation mode, the refrigerant flow is changed by the switching of the four-way valve 12 according to the user's selection.

For example, in the heating operation, the four-way valve 12 is turned on, and the refrigerant flows along the direction of the dotted arrow in FIG. 1 to the compressor 11 → the four-way valve 12 → the indoor heat exchangers 21A, 21B, 21C, and 21D. EEVs 15A, 15B, 15C, and 15D form an outdoor heat exchanger 13, a four-way valve 12, an accumulator 16, and a compressor 11.

On the other hand, in the cooling operation, the four-way valve 12 is turned off so that the refrigerant flows in the direction of the solid arrow in FIG. 1 from the compressor 11 to the four-way valve 12 to the outdoor heat exchanger 13 to the EEV 15A, 15B, 15C, and the like. 15D) → indoor heat exchangers 21A, 21B, 21C, 21D → four-way valve 12 → accumulator 16 → compressor 11 to form a refrigeration cycle.

FIG. 2 is a control configuration diagram of a pipe connection inspection apparatus of a multi-type air conditioner according to an embodiment of the present invention. In addition to the apparatus shown in FIG. 1, the input unit 30, the control unit 32, the compressor driving unit 34, and the outdoor unit And a fan driver 36, an indoor fan driver 38, a valve driver 40, and a display unit 42.

The input unit 30 inputs an operation signal for executing the cooling pipe inspection mode at the time of initial installation or transfer of the multi-type air conditioner, and is usually installed in the outdoor unit 10 so that the installer can operate.

The control unit 32 is a microcomputer that controls the devices of the outdoor unit 10 and the plurality of indoor units 20A, 20B, 20C, and 20D by receiving a user command, and includes a cooling pipe checking mode (a mode for checking a pipe connection by cooling operation). ) Inlet pipe temperature difference of each indoor heat exchanger 21A, 21B, 21C, 21D according to the opening degree of EEV 15A, 15B, 15C, 15D corresponding to each indoor unit 20A, 20B, 20C, 20D in advance In the case of a predetermined constant temperature range (approximately, less than 4 ~ 8 ℃) by changing (specifically, increase) the frequency of the compressor (11) by re-checking the pipe connection in the cooling operation pipe inspection indoor units (20A, 20B, 20C, 20D) Prevent the pipe inspection error that may occur when the volume is large.

The compressor driver 34 controls the driving of the compressor 11 according to the compressor control signal of the controller 32, and the outdoor fan driver 36 controls the outdoor fan 14 according to the outdoor fan control signal of the controller 32. The indoor fan driver 38 controls the driving of the indoor fans 22A, 22B, 22C, and 22D according to the indoor fan control signal of the controller 32.

The valve driver 40 controls the driving of the four-way valve 12 and the EEVs 15A, 15B, 15C, and 15D according to the valve control signal of the controller 32, and the display unit 42 displays the controller 32. In accordance with the control signal, it displays the cooling piping inspection status and error mode of the multi-type air conditioner.

Hereinafter, the operation process and the effect of the pipe connection check device and method of the multi-type air conditioner configured as described above will be described.

3A and 3B are flowcharts illustrating a method for checking a pipe connection of a multi-type air conditioner according to the present invention.

As an initial condition for explaining the operation of the present invention, the multi-type air conditioner of the present invention has four indoor units 20A, 20B, 20C, and 20D connected to one outdoor unit 10, and each indoor unit 20A, 20B, 20C. The openings of the EEVs 15A, 15B, 15C, and 15D corresponding to, 20D are completely opened (480STEP) to maintain the pressure balance of the refrigerant passage (see FIG. 4).

When the installer operates the air conditioning pipe check button normally installed in the outdoor unit 10 to check the pipe connection between the outdoor unit 10 and the indoor units 20A, 20B, 20C, and 20D during the initial installation or transfer of the multi-type air conditioner. In operation S100, the control unit 32 receives an operation signal of the cooling pipe check button from the cooling pipe check mode.

In the cooling pipe check mode, the controller 32 checks the piping connection between the outdoor unit 10 and the indoor units 20A, 20B, 20C, and 20D by cooling operation, as shown in FIG. To turn off the refrigeration cycle to the cooling operation (S102), and at the same time to drive the indoor fan (22A, 22B, 22C, 22D) of the outdoor fan 14 and all the indoor units (20A, 20B, 20C, 20D) (S104).

In addition, the controller 32 controls the pipe temperature E1 which is the inlet temperature of the indoor heat exchangers 21A, 21B, 21C, and 21D of all the indoor units 20A, 20B, 20C, and 20D, respectively. In order to detect through the pipe temperature sensor (23A, 23B, 23C, 23D) installed in the (S106), any of the indoor units (20A, 20B, 20C, 20D) of the indoor unit to start the pipe inspection from FIG. As shown, opening the EEV (any one of 15A, 15B, 15C, 15D; for example 15A) of the pipe inspection indoor unit 20A, 20B, 20C, or 20D; Then, the remaining EEVs (except any one of 15A, 15B, 15C, and 15D; 15A, 15B, and 15C) are opened (S108).

Subsequently, when a predetermined time t1 for protecting the compressor 11 elapses, as shown in FIG. 4, the compressor 11 is operated at a pipe check mode frequency (20 Hz) to allow a pipe check indoor unit (for example, 20A). Perform the cooling operation of (S110).

As shown in FIG. 4 after the operation of the compressor 11, when a predetermined first time (operation time for checking the pipe connection of the first pipe inspection indoor unit, about 3 minutes and 50 seconds) has elapsed (S112), In order to check the pipe temperature change of the indoor unit 20A, the pipe temperature E2 changed after opening the EEV 15A corresponding to the pipe inspection indoor unit 20A is carried out by a pipe temperature sensor 23A installed in the indoor unit 20A. Detecting and inputting to the control unit 32 (S114).

Accordingly, the control unit 32 calculates the difference ΔEa between the pipe temperature E1 before opening the EEV 15A of the pipe inspection indoor unit 20A and the pipe temperature E2 after opening (S116), and calculates the pipe. It is determined whether the temperature difference ΔEa is equal to or greater than a predetermined reference temperature difference Es (minimum pipe temperature difference, about 8 ° C.) changed by cooling operation according to the opening of the EEV when the pipe connection is properly established (S118).

As a result of the determination in S118, when the calculated pipe temperature difference ΔEa is equal to or higher than the reference temperature difference Es, the controller 32 determines that the pipe connection of the pipe inspection indoor unit 20A is properly performed, and checks the pipe of the indoor unit 20A. To complete (S132).

On the other hand, when the calculated pipe temperature difference ΔEa is not greater than or equal to the reference temperature difference Es as a result of the determination in S118, the controller 32 calculates the pipe temperature difference Δ calculated in consideration of the case where the pipe inspection indoor unit 20A has a large volume. It is determined whether Ea) is equal to or greater than the recheck temperature difference (Em; piping connection is correct, but the pipe temperature difference is changed by cooling operation according to the opening of the EEV, about 4 ° C. if the indoor unit volume is large (S120).

As a result of the determination in S120, when the calculated pipe temperature difference ΔEa is not equal to or greater than the recheck temperature difference Em, the controller 32 determines that the pipe connection of the pipe inspection indoor unit 20A is not properly performed, and the corresponding indoor unit ( A pipe inspection error of 20A occurs (S140).

On the other hand, the determination result of the S120, when the calculated pipe temperature difference (ΔEa) is more than the re-check temperature difference (Em), the control unit 32 is a pipe connection of the pipe inspection indoor unit (20A), but may have a large volume The compressor 11 is changed to a pipe recheck mode frequency (25 Hz) in which the frequency is increased by 5 Hz to perform a cooling operation to recheck the pipe connection of the pipe check indoor unit 20A (S122).

After a predetermined second time (operation time for rechecking the pipe connection of the pipe inspection indoor unit, about 2 minutes) after the frequency change operation of the compressor 11 (S124), the pipe temperature change of the pipe inspection indoor unit 20A changes. In order to check, the pipe temperature E3 changed after the compressor 11 frequency change operation is sensed by the pipe temperature sensor 23A of the pipe inspection indoor unit 20A and input to the controller 32 (S126).

Accordingly, the control unit 32 calculates the difference ΔEb between the pipe temperature E1 before opening the EEV 15A of the pipe inspection indoor unit 20A and the pipe temperature E3 after the compressor 11 frequency change operation ( S128), it is determined whether or not the calculated pipe temperature difference ΔEb is equal to or greater than a predetermined reference temperature difference Es (S130).

As a result of the determination in S130, when the calculated pipe temperature difference ΔEb is equal to or greater than the reference temperature difference Es, the controller 32 determines that the pipe connection of the pipe inspection indoor unit 20A is properly performed and checks the pipe of the indoor unit 20A. Complete (S132).

Meanwhile, as a result of the determination of S130, when the calculated pipe temperature difference ΔEa is not equal to or more than the reference temperature difference Es, the controller 32 determines that the pipe connection of the pipe inspection indoor unit 20A is not properly performed, and the corresponding indoor unit ( A pipe inspection error of 20A occurs (S140).

In this way, it is determined whether the pipe connection of the pipe inspection indoor unit 20A is properly made or a pipe inspection error, and the control unit 32 determines whether the pipe inspection of all indoor units 20A, 20B, 20C, and 20D is finished ( S134), when all the indoor units 20A, 20B, 20C, and 20D have been checked for piping, as shown in FIG. 4, the compressor 11, the outdoor fan 14, and the indoor fans 22A, 22B, 22C, and 22D. (S136), the operation is terminated while opening the EEVs 15A, 15B, 15C, and 15D corresponding to all the indoor units 20A, 20B, 20C, and 20D completely (S138).

On the other hand, as a result of the determination in S134, when the pipe inspection of all indoor units 20A, 20B, 20C, and 20D is not finished, the control unit 32 ends the pipe inspection of any indoor unit 20A, and the next indoor units 20A, 20B, 20C, Any one of 20D; for example, as shown in FIG. 4 to start pipe inspection of 20B, any one of EEVs 15A, 15B, 15C, and 15D of the next pipe inspection indoor unit 20B; for example, 15B. ) Opening the opening degree to 170STEP, and closes the opening degree of the remaining EEV (except any one of 15A, 15B, 15C, 15D; 15A, 15C, 15D) (S142).

At this time, the opening of the EEV 15A of the previous pipe inspection indoor unit 20A is not immediately closed, but closed with a predetermined delay time (about 10 seconds) to facilitate the refrigerant circulation of the next pipe inspection indoor unit 20B, and the compressor ( 11) by returning to the initial pipe inspection mode frequency (20 Hz) before the change to perform the cooling operation to check the pipe connection of the next pipe inspection indoor unit (20B) (S144).

After a predetermined second time (operation time for rechecking the pipe connection of the next pipe inspection indoor unit, about 2 minutes) after the operation of the compressor 11 for pipe inspection of the next indoor unit 20B (S146), the next pipe In order to check the pipe temperature change of the inspection indoor unit 20B, it is fed back to the step S114 to proceed with the subsequent operation.

As described above, the present invention is a pipe of the indoor unit (20A, 20B, 20C, 20D) in the cooling pipe inspection mode for checking the pipe connection of the outdoor unit 10 and the indoor units (20A, 20B, 20C, 20D). If the temperature change is small and it is difficult to determine whether the pipe connection is properly performed or the volume of the indoor unit (any one of 20A, 20B, 20C, or 20D) is large, the outdoor unit 10 and the indoor unit may be additionally operated by increasing the compressor 11 frequency. To prevent errors that may occur when inspecting pipes 20A, 20B, 20C, and 20D.

As described above, according to the pipe connection check device and method of the multi-type air conditioner according to the present invention, the pipes before and after starting in the cooling pipe check mode for checking the pipe connection between the outdoor unit and the plurality of indoor units in a cooling operation. If the temperature difference is within a certain temperature range, it is possible to improve the pipe inspection error that may occur when the indoor unit volume is large by changing the compressor frequency and rechecking the pipe connection.

Claims (10)

In the outdoor unit, a plurality of indoor units having a plurality of indoor units connected to the outdoor unit, a plurality of EEVs corresponding to each of the plurality of indoor units are provided for checking the pipe connection of the multi-type air conditioner to check the pipe connection of the outdoor unit and the plurality of indoor units , A compressor is operated when the EEV corresponding to each of the plurality of indoor units is opened; Detecting the indoor unit piping temperature difference before and after opening the EEV by the compressor operation, Compare the detected pipe temperature difference with a predetermined reference temperature and change the compressor frequency to operate when the pipe temperature difference is within a reference temperature range; The pipe connection check method of the multi-type air conditioner, characterized in that for detecting the indoor unit piping temperature difference by the compressor frequency change operation to check the pipe connection for matching the plurality of indoor unit and the EEV. The method of claim 1, Operating the compressor when the EEV corresponding to each of the plurality of indoor units is opened, Opening only the EEV corresponding to any one indoor unit to supply the refrigerant to any one indoor unit of the plurality of indoor units, and the pipe connection check of the multi-type air conditioner, characterized in that for operating the compressor at a predetermined pipe inspection mode frequency Way. The method of claim 1, Detecting each indoor unit pipe temperature difference before and after opening the EEV by the compressor operation, In the state in which the fans of all the indoor units are operated by the outdoor unit cooling operation, only the EEV corresponding to any one indoor unit of the plurality of indoor units is opened to detect a change in the indoor unit piping temperature before opening the EEV and the indoor unit piping temperature after opening the EEV. To check the piping connection of a multi-type air conditioner. The method of claim 1, The reference temperature range is less than about 4 ~ 8 ℃ pipe connection check method of the multi-type air conditioner, characterized in that. 5. The method of claim 4, Operating by changing the compressor frequency, And increasing the compressor frequency by a predetermined frequency to further perform a cooling operation for inspecting the pipes of the indoor units. 6. The method of claim 5, The predetermined frequency is a pipe connection check method of the multi-type air conditioner, characterized in that about 5Hz or more. The method of claim 1, Checking the pipe connection for matching the plurality of indoor unit and the EEV, Detecting an indoor unit piping temperature difference before the EEV opening and an indoor unit piping temperature difference after the compressor frequency change operation; When the pipe temperature difference is greater than or equal to the reference temperature difference, it is determined that the pipe connection of the indoor unit is properly performed. When the pipe temperature difference is less than the reference temperature difference, a pipe inspection error of the indoor unit is generated to generate the plurality of pipes. Checking the pipe connection of the multi-type air conditioner, characterized in that for checking the indoor unit piping connection. Outdoor unit; A plurality of indoor units connected to a plurality of pipes to the outdoor unit; A plurality of EEVs provided to correspond to the plurality of indoor units, respectively; A compressor to operate when the EEVs corresponding to the plurality of indoor units are opened; And Each indoor unit pipe temperature difference is detected before and after opening of the EEV, and the detected pipe temperature difference is compared with a predetermined reference temperature, and when the pipe temperature difference is within the reference temperature range, the compressor frequency is changed to operate the plurality of indoor units and the EEV. Control unit for checking the pipe connection for matching; Pipe connection check device of a multi-type air conditioner including. 9. The method of claim 8, The control unit opens only the EEV corresponding to any one of the indoor units of the plurality of indoor units, and changes the indoor unit piping temperature before opening the EEV and the indoor unit piping temperature after opening the EEV in a cooling operation of operating the compressor at a predetermined pipe inspection mode frequency. Checking the pipe connection of the multi-type air conditioner, characterized in that for checking the connection of the outdoor unit and the plurality of indoor unit piping. 10. The method of claim 9, The control unit further performs a cooling operation to increase the compressor frequency when the pipe temperature difference is within a reference temperature range, and detects a change in the indoor unit piping temperature before opening the EEV and a change in the indoor unit piping temperature after the compressor frequency change operation. The pipe connection check device of the multi-type air conditioner, characterized in that for checking the indoor unit piping connection.

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