KR20110003768A - Air conditioner and method for method for testing drive of air conditioner - Google Patents

Abstract

PURPOSE: An air conditioner and a test method thereof are provided to improve the accuracy of malfunction determination and to reduce time and labor by automating the malfunction determination. CONSTITUTION: A test method of an air conditioner is as follows. Closed expansion valves of parts of indoor units among multiple indoor units are opened. The opened expansion valves are closed, and the expansion valves of the other indoor units are opened. The piping temperature of the indoor units with the closed expansion valves is measured and is compared with the piping temperature of the indoor units with the opened expansion valves.

Description

Air conditioner and method for method for testing drive of air conditioner}

The present invention relates to an air conditioner and an air conditioner commissioning method, and more particularly, to an air conditioner and an air conditioner commissioning method for automatically performing fault detection for an indoor expansion valve.

An air conditioner refers to an air conditioner that keeps air in a certain space in a comfortable state for human life. Such an air conditioner performs a function of absorbing heat in a predetermined space or releasing heat into the space to maintain the temperature and humidity of the space at an appropriate level. Such an air conditioner is essentially required for an indoor unit that absorbs heat or discharges heat into a space.

Various devices are constructed in the indoor unit, and in particular, an indoor expansion valve for throttling a refrigerant. In the related art, in order to determine a failure state of an indoor expansion valve, an expert monitors an operation state of an indoor unit to determine whether a valve is abnormal.

The problem to be solved by the present invention is to automate the failure detection of the indoor expansion valve of the air conditioner, which was only dependent on the expert.

The objects of the present invention are not limited to the above-mentioned objects, and other objects that are not mentioned will be clearly understood by those skilled in the art from the following description.

In order to achieve the above object, the air conditioner commissioning method according to an embodiment of the present invention, the first operation step of opening the expansion valve of some of the indoor unit of the plurality of indoor units, the expansion valve is all closed, and the open expansion valve And a second driving step of closing the expansion valves of the other indoor units and opening all expansion valves of the plurality of indoor units.

In order to achieve the above object, the air conditioner commissioning method according to an embodiment of the present invention, the front room operation step of opening all the expansion valves of the plurality of indoor units in which the expansion valve is all closed, and the plurality of the expansion valve all open And a second driving step of closing an expansion valve of some of the indoor units of the indoor unit, and a first driving step of opening the closed expansion valve and closing the expansion valve of the other indoor unit.

In order to achieve the above object, the air conditioner according to an embodiment of the present invention, a plurality of indoor heat exchangers, the refrigerant is heat-exchanged with the indoor air, a plurality of indoor expansion connected to each of the plurality of indoor heat exchangers to throttle the refrigerant A valve, a plurality of indoor pipe temperature sensors measuring respective pipe temperatures connected to the plurality of indoor heat exchangers, and an expansion valve of some indoor units of the plurality of indoor heat exchangers is opened and an expansion valve of some other indoor units is closed. And a control unit for closing the open expansion valve of the some indoor unit and opening the closed expansion valve of the other some indoor unit.

Specific details of other embodiments are included in the detailed description and the drawings.

According to the air conditioner and the air conditioner commissioning method of the present invention has one or more of the following effects.

First, there is an advantage of reducing the waste of time and manpower by automating the determination of the failure of the indoor expansion valve of the air conditioner, which was relying only on experts.

Second, there is an advantage of improving the accuracy of the determination of the failure of the indoor expansion valve of the air conditioner, depending on the skill of the expert.

Third, there is an advantage that can be determined together with the failure of the indoor expansion valve during the trial operation of the air conditioner.

The effects of the present invention are not limited to the above-mentioned effects, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims.

Advantages and features of the present invention and methods for achieving them will be apparent with reference to the embodiments described below in detail with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but can be implemented in various different forms, and only the embodiments make the disclosure of the present invention complete, and the general knowledge in the art to which the present invention belongs. It is provided to fully inform the person having the scope of the invention, which is defined only by the scope of the claims. Like reference numerals refer to like elements throughout.

Hereinafter, the present invention will be described with reference to the drawings for explaining an air conditioner and an air conditioner trial operation method according to embodiments of the present invention.

1 is a block diagram of an air conditioner according to an embodiment of the present invention.

An air conditioner according to an embodiment of the present invention includes an outdoor unit OU and a plurality of indoor units IU.

The outdoor unit OU includes a compressor 110, an outdoor heat exchanger 140, an outdoor expansion valve 132, and a supercooler 180. The air conditioner may include one or a plurality of outdoor units OU, and in this embodiment, one outdoor unit OU is provided.

The compressor 110 compresses the low temperature low pressure refrigerant into the high temperature high pressure refrigerant. The compressor 110 may be applied in various structures, and an inverter type compressor or a constant speed compressor may be adopted. The discharge temperature sensor 171 and the discharge pressure sensor 151 are installed on the discharge pipe 161 of the compressor 110. In addition, a suction temperature sensor 175 and a suction pressure sensor 154 are installed on the suction pipe 162 of the compressor 110.

The outdoor unit OU includes one compressor 110, but the present invention is not limited thereto. The outdoor unit OU may include a plurality of compressors, and may include an inverter type compressor and a constant speed compressor.

An accumulator 187 may be installed in the suction pipe 162 of the compressor 110 to prevent the liquid refrigerant from flowing into the compressor 110. An oil separator 113 may be installed in the discharge pipe 161 of the compressor 110 to recover oil from the refrigerant discharged from the compressor 110.

The four-way valve 160 is a flow path switching valve for cooling and heating switching, and guides the refrigerant compressed by the compressor 110 to the outdoor heat exchanger 140 during the cooling operation and to the indoor heat exchanger 120 during the heating operation. The four-way valve 160 is in the A state during the cooling operation and in the B state during the heating operation.

The outdoor heat exchanger 140 is disposed in an outdoor space, and the refrigerant passing through the outdoor heat exchanger 140 exchanges heat with outdoor air. The outdoor heat exchanger 140 acts as a condenser during the cooling operation and acts as an evaporator during the heating operation.

The outdoor expansion valve 132 throttles the refrigerant introduced during the heating operation, and is installed on the inlet pipe 166 connecting the liquid pipe 165 and the outdoor heat exchanger 140. In addition, a first bypass pipe 167 is installed on the inlet pipe 166 to allow the refrigerant to bypass the outdoor expansion valve 132, and a check valve 133 is installed on the first bypass pipe 167. .

The check valve 133 flows refrigerant from the outdoor heat exchanger 140 to the plurality of indoor units IU during the cooling operation, but blocks the flow of the refrigerant during the heating operation.

The subcooler 180 includes a subcooled heat exchanger 184, a second bypass pipe 181, a subcooled expansion valve 182, and a discharge pipe 185. The subcooling heat exchanger 184 is disposed on the inlet pipe 166. During the cooling operation, the second bypass pipe 181 bypasses the refrigerant discharged from the subcooling heat exchanger 184 and performs a function of introducing the subcooled expansion valve 182 into the subcooling expansion valve 182.

 The subcooled expansion valve 182 is disposed on the second bypass pipe 181 to throttle the liquid refrigerant flowing into the second bypass pipe 181 to lower the pressure and temperature of the refrigerant, and then the heat exchanger for subcooling. (184). Various types of subcooled expansion valves 182 may be used, and linear expansion valves may be used for ease of use. The subcooled temperature sensor 183 is installed on the second bypass pipe 181 to measure the temperature of the refrigerant throttled by the subcooled expansion valve 182.

In the cooling operation, a plurality of indoor units (IU) are cooled after the condensed refrigerant passing through the outdoor heat exchanger 140 is cooled by heat exchange with the low temperature refrigerant introduced through the second bypass pipe 181 and the subcooling heat exchanger 184. Flow to.

The refrigerant passing through the second bypass pipe 181 is introduced into the accumulator 187 through the discharge pipe 185 after heat exchange in the subcooled heat exchanger 184. The discharge pipe temperature sensor 178 which measures the temperature of the refrigerant flowing into the accumulator 187 is installed on the discharge pipe 185.

The liquid pipe temperature sensor 174 and the liquid pipe pressure sensor 156 are installed on the liquid pipe 165 connecting the subcooler 180 and the plurality of indoor units IU.

In the air conditioner according to the embodiment of the present invention, the plurality of indoor units IU include an indoor heat exchanger 120, an indoor blower 125, and an indoor expansion valve 131, respectively. The air conditioner may include one or a plurality of indoor units (IU). In the present embodiment, a plurality of air conditioners are provided from IU 1 to IU (n).

The indoor heat exchanger 120 is disposed in an indoor space, and the refrigerant passing through the indoor heat exchanger 120 exchanges heat with indoor air. The indoor heat exchanger 120 acts as an evaporator during the cooling operation, and acts as a condenser during the heating operation. The indoor heat exchanger 120 is provided with an indoor temperature sensor 176 for measuring the indoor temperature.

The indoor blower 125 blows indoor air that is heat exchanged in the indoor heat exchanger 120.

The indoor expansion valve 131 is a device for condensing the refrigerant introduced during the cooling operation. The indoor expansion valve 131 is installed in the indoor inlet pipe 163 of the indoor unit IU. Various types of indoor expansion valves 131 may be used, and a linear expansion valve may be used for ease of use.

The indoor expansion valve 131 is opened at the set opening degree during the cooling operation, and is fully opened during the heating operation. The indoor expansion valve 131 may be closed during the blowing operation, in which the closing means not the physical full closure but the opening degree through which the refrigerant does not flow. The indoor expansion valve 131 may be closed or opened to determine whether the failure.

The indoor inlet pipe temperature sensor 173 is installed on the indoor inlet pipe 163. The indoor inlet pipe temperature sensor 173 may be installed between the indoor heat exchanger 120 and the indoor expansion valve 131. In addition, the indoor outlet pipe temperature sensor 172 is provided on the indoor outlet pipe 164.

The indoor unit IU is provided with an indoor temperature sensor 179 that measures the temperature of the indoor air. The room temperature sensor 179 measures the temperature of the room in which the indoor unit IU is installed.

The flow of the refrigerant during the cooling operation of the air conditioner described above is as follows.

The high temperature and high pressure gaseous refrigerant discharged from the compressor 110 flows into the outdoor heat exchanger 140 via the four-way valve 160. In the outdoor heat exchanger 140, the refrigerant is condensed by heat exchange with the outdoor air. The refrigerant flowing out of the outdoor heat exchanger 140 is introduced into the subcooler 180 through the fully open outdoor expansion valve 132 and the bypass pipe 133. The introduced refrigerant is subcooled in the subcooling heat exchanger 184 and then introduced into the plurality of indoor units IU.

A portion of the subcooled refrigerant in the subcooled heat exchanger 184 is throttled in the subcooled expansion valve 182 to subcool the refrigerant passing through the subcooled heat exchanger 184. The subcooled heat exchanger 184 is introduced into the accumulator 187.

The refrigerant introduced into each indoor unit IU is throttled by the indoor expansion valve 131 opened at the set opening degree, and then heat-exchanges with the indoor air in the indoor heat exchanger 120 to evaporate. The evaporated refrigerant is introduced into the compressor 110 through the four-way valve 160 and the accumulator 187.

The flow of the refrigerant during the heating operation of the air conditioner described above is as follows.

The high temperature and high pressure gaseous refrigerant discharged from the compressor 110 flows into the plurality of indoor units IU through the four-way valve 160, respectively. The indoor expansion valves 131 of each indoor unit IU are fully open. Therefore, the refrigerant flowing from the indoor unit IU is throttled by the outdoor expansion valve 132, and then heat exchanges with the outdoor air in the outdoor heat exchanger 140 to evaporate. The evaporated refrigerant is introduced into the suction pipe 162 of the compressor 110 through the four-way valve 160 and the accumulator 187.

2 is a block diagram of an air conditioner according to an embodiment of the present invention.

The indoor outlet pipe temperature sensor 172 measures the temperature of the refrigerant flowing out of the indoor heat exchanger 120. The indoor outlet pipe temperature sensor 172 is installed on the indoor outlet pipe 164.

The indoor inlet pipe temperature sensor 173 measures the temperature of the refrigerant flowing into the indoor heat exchanger 120. The indoor inlet pipe temperature sensor 173 is installed on the indoor inlet pipe 163 connecting the indoor heat exchanger 120 and the indoor expansion valve 131.

In the present invention, the temperature measured by the indoor outlet pipe temperature sensor 172 and / or the indoor inlet pipe temperature sensor 173 is a pipe temperature of the indoor unit.

The room temperature sensor 176 measures the temperature of the room air. The room temperature sensor 176 is installed in the indoor unit IU.

The controller 190 determines whether the indoor expansion valve 131 is broken based on the measured indoor unit piping temperature while opening and closing the indoor expansion valve 131. The indoor unit piping temperature is the temperature measured by the indoor outlet piping temperature sensor 172 or the indoor inlet piping temperature sensor 173. The indoor unit pipe temperature may be an average value of temperatures measured by the indoor outlet pipe temperature sensor 172 and the indoor inlet pipe temperature sensor 173.

The controller 190 determines whether the change in the indoor unit piping temperature is abnormal when the indoor expansion valve 131 is opened or closed. The controller 190 tracks the change in the indoor unit piping temperature from the open state to the closed state of the indoor expansion valve 131, and determines whether the indoor expansion valve 131 is broken by comparing with the normal state. The controller 190 tracks the change in the indoor unit pipe temperature from the closed state to the open state and determines whether the indoor expansion valve 131 is broken by comparing with the normal state.

The controller 190 may determine whether the difference between the indoor unit piping temperature and the indoor air temperature difference is abnormal when the indoor expansion valve 131 is opened or closed. The controller 190 tracks the change in the difference between the indoor unit piping temperature and the indoor air temperature from the open state to the closed state and determines whether the indoor expansion valve 131 is broken by comparing with the normal state. do.

If the change in the indoor unit piping temperature is abnormal, the controller 190 preferably stores the data indicating that the indoor expansion valve 131 is broken or warns to the outside through the output unit 193.

When the controller 190 determines that the indoor expansion valve 131 is broken, the output unit 193 may visually or externally display it to the outside or transmit the same to another system.

3 is a flowchart illustrating a cooling trial operation method of an air conditioner according to an embodiment of the present invention, and FIG. 4 is a view illustrating an operating state of an indoor unit according to the cooling trial operation method of FIG. 3.

Only one indoor unit IU (1) of the plurality of indoor units IU (1) to IU (n) is cooled and operated to determine a single cycle stability (S210). In the present invention, opening the indoor expansion valve of some indoor units of the plurality of indoor units IU is the first operation, and in particular, the indoor expansion valve 131 (1) of one indoor unit IU (1) of the plurality of indoor units is opened. The cooling operation with opening and the four-way valve 160 in the A state is one chamber cycle stability judgment during the cooling trial operation. At this time, it is preferable that the indoor unit IU (1), in which the indoor expansion valve 131 (1) is opened and cooled, is the indoor unit having the smallest capacity. The remaining indoor units (IU (2) to IU (n)) in which the indoor expansion valves (131 (2) to 131 (n)) are not opened operate the indoor blowers (125 (2) to 125 (n)). It is desirable to operate in mode.

In the one-cycle cycle determination, only one indoor unit (IU (1)) is cooled to determine whether the cycle is stabilized. It is preferable to measure the piping temperature of the remaining indoor units IU (2) to IU (n) where the indoor expansion valves 131 (2) to 131 (n) are not opened when determining the one-cycle cycle stability. The piping temperature of the indoor unit is the temperature measured by the indoor outlet piping temperature sensors 172 (2) to 172 (n) or the indoor inlet piping temperature sensors 173 (2) to 173 (n).

One indoor unit (IU (1)) in the cooling operation stops the cooling operation and checks the expansion valve by cooling the remaining indoor units (IU (2) to IU (n)) (S220). In the present invention, closing the open indoor expansion valve and opening the indoor expansion valves of the other indoor units is the second operation, in particular, the indoor expansion valve 131 (1) of one indoor unit (IU (1)) is closed and the rest is Opening the indoor expansion valves 131 (2) to 131 (n) of the indoor units IU (2) to IU (n) and performing the cooling operation with the four-way valve 160 in the A state expands during the cooling trial operation. Valve check. The indoor unit IU 1 in which the indoor expansion valve 131 (1) is closed preferably operates in the blowing mode by operating the indoor blower 125 (1).

When checking the expansion valve, measure the pipe temperature of the indoor units (IU (2) ~ IU (n)) that opened the indoor expansion valve (131 (2) ~ 131 (n)) and compare each with the pipe temperature measured in step S210 It is desirable to. The controller 190 tracks the change in the indoor unit pipe temperature from the closed state of the indoor expansion valves 131 (2) to 131 (n) to an open state, and determines whether the indoor expansion valve is broken by comparing with the normal state. If the change in the indoor unit piping temperature is abnormal, the controller 190 preferably stores the data indicating that the indoor expansion valve 131 is broken or warns to the outside through the output unit 193.

In addition, it is preferable to measure the piping temperature of the indoor unit IU 1 in which the indoor expansion valve 131 (1) is closed when the expansion valve is checked.

Cooling operation of all indoor units IU (1) to IU (n) determines stability of the entire room cycle (S230). In the present invention, opening all indoor expansion valves of the plurality of indoor units IU is all-room operation, and in particular, indoor expansion valves 131 (1) to 131 (n) of all indoor units IU (1) to IU (n). Cooling operation with the open side) and the four-way valve 160 in the A state is the stability of all chamber cycles during the cooling trial operation. It is preferable to open only the indoor expansion valve 131 (1) of the indoor unit IU (1) in which the indoor expansion valve 131 (1) is closed when checking the expansion valve.

The full-cycle cycle stability determination determines whether the cycle is stabilized by cooling all the indoor units IU (1) to IU (n). When determining the stability of the entire room cycle, it is preferable to measure the pipe temperature of the indoor unit IU (1) in which the indoor expansion valve 131 (1) is opened and compare it with the pipe temperature measured in step S220. The controller 190 tracks the change in the indoor unit piping temperature from the closed state to the open state of the indoor expansion valve 131 (1), and determines whether the indoor expansion valve is broken by comparing with the normal state. If the change in the indoor unit piping temperature is abnormal, the controller 190 preferably stores the data indicating that the indoor expansion valve 131 is broken or warns to the outside through the output unit 193.

It is determined whether the refrigerant amount of the air conditioner is an appropriate amount (S240). The method of determining the amount of refrigerant may be determined in various ways, and in the embodiment of the present invention, it is determined whether the subcooling degree is a normal value. That is, the saturation temperature of the supercooled coolant is calculated from the pressure measured by the liquid pipe pressure sensor 156, and the subcooling degree is calculated by calculating a difference from the liquid pipe temperature measured by the liquid pipe temperature sensor 174 to determine the amount of refrigerant.

Check the constant speed compressor (S250). When the compressor 110 is a constant speed compressor, it is checked whether the current upper limit value of the constant speed compressor is within a reference value. In the embodiment of the present invention, it is checked whether the current upper limit of the constant speed compressor is within 20 mA.

5 is a view showing the temperature change according to the opening and closing of the indoor expansion valve during the cooling operation in the air conditioner according to an embodiment of the present invention.

5 illustrates a change in the indoor unit piping temperature from the closed state to the open state of the indoor expansion valve 131 during the cooling operation. The controller 190 determines whether the indoor expansion valve 131 operates normally by using the difference between the indoor unit pipe temperatures of the T1 and T2 sections.

6 is a flowchart illustrating a heating trial operation method of an air conditioner according to an embodiment of the present invention, and FIG. 7 is a view illustrating an operating state of an indoor unit according to the heating trial operation method of FIG. 6.

All indoor units IU (1) to IU (n) are heated to determine the stability of the entire room cycle (S210). In the present invention, opening all indoor expansion valves of the plurality of indoor units IU is all-room operation, and in particular, indoor expansion valves 131 (1) to 131 (n) of all indoor units IU (1) to IU (n). It is judged that all rooms cycle stability at the time of heating trial operation is to open heating) and open the four-way valve 160 to B state.

The full-cycle cycle stability determination determines whether the cycle is stabilized by heating all indoor units IU (1) to IU (n). When determining the stability of the entire room cycle, the pipe temperature of all indoor units (IU (1) to IU (n)) is measured, or only one indoor unit (IU (1)) measures the pipe temperature.

Only one indoor unit (IU (1)) stops the heating operation and heats the remaining indoor units (IU (2) to IU (n)) to check the expansion valve (S320). In the present invention, closing the open indoor expansion valve and opening the indoor expansion valves of the other indoor units is the second operation, in particular, the indoor expansion valve 131 (1) of one indoor unit (IU (1)) is closed and the rest is Opening the indoor expansion valves 131 (2) to 131 (n) of the indoor units IU (2) to IU (n) and performing heating operation with the four-way valve 160 in the B state expands during the heating trial operation. Check valve. The indoor expansion valves 131 of one indoor unit IU (1) with the indoor expansion valves 131 (1) to 131 (n) of all the indoor units IU (1) to IU (n) opened. It is preferable to open only 1)). The indoor unit IU 1 in which the indoor expansion valve 131 (1) is closed preferably operates in the blowing mode by operating the indoor blower 125 (1).

When checking the expansion valve, it is preferable to measure the pipe temperature of the indoor unit IU (1) in which the indoor expansion valve 131 (1) is closed and compare it with the pipe temperature measured in step S310. The controller 190 tracks the change in the indoor unit piping temperature from the open state to the closed state of the indoor expansion valve 131 (1), and determines whether the indoor expansion valve is broken by comparing with the normal state. If the change in the indoor unit piping temperature is abnormal, the controller 190 preferably stores the data indicating that the indoor expansion valve 131 is broken or warns to the outside through the output unit 193.

In addition, when checking the expansion valve, it is preferable to measure the piping temperature of the indoor units IU (2) to IU (n) in which the indoor expansion valves 131 (2) to 131 (n) are closed.

Only one indoor unit IU (1) of the plurality of indoor units IU (1) to IU (n) is heated to determine the stability of one room cycle (S330). In the present invention, the opening of the indoor expansion valve of some indoor units of the plurality of indoor units IU is the first operation, in particular, the indoor expansion valve 131 (1) of one indoor unit IU (1) is opened and the remaining indoor units are opened. To close the indoor expansion valves (131 (2) to 131 (n)) of the field (IU (2) to IU (n)) and perform the heating operation with the four-way valve 160 in the B state. Cycle stability judgment. The indoor units IU (2) to IU (n) with the indoor expansion valves 131 (2) to 131 (n) closed operate the indoor blowers 125 (2) to 125 (n) in a blowing mode. It is desirable to work.

In the one-cycle cycle determination, only one indoor unit (IU (1)) is heated to determine whether the cycle is stabilized. When it is determined that one-cycle cycle is stable, the pipe temperatures of the indoor units (IU (2) to IU (n)) in which the indoor expansion valves 131 (2) to 131 (n) are closed are measured and the pipe temperature measured in step S320 is measured. It is preferable to compare each. The control unit 190 tracks the change in the indoor unit piping temperature from the open state to the closed state of the indoor expansion valves 131 (2) to 131 (n), and determines whether the indoor expansion valve is broken by comparing with the normal state. If the change in the indoor unit piping temperature is abnormal, the controller 190 preferably stores the data indicating that the indoor expansion valve 131 is broken or warns to the outside through the output unit 193.

Check the constant speed compressor (S340). When the compressor 110 is a constant speed compressor, it is checked whether the current upper limit value of the constant speed compressor is within a reference value. In the embodiment of the present invention, it is checked whether the current upper limit of the constant speed compressor is within 20 mA.

Operate the oil recovery (S350). The four-way valve 160 is switched from the B state to the A state so that oil is recovered.

8 is a view showing the temperature change according to the opening and closing of the indoor expansion valve during the heating operation in the air conditioner according to an embodiment of the present invention.

8 shows a change in the indoor unit piping temperature from the open state to the closed state when the indoor expansion valve 131 is opened during the heating operation. The controller 190 determines whether the indoor expansion valve 131 operates normally by using the difference between the indoor unit pipe temperatures of the T1 and T2 sections.

Those skilled in the art will appreciate that the present invention can be embodied in other specific forms without changing the technical spirit or essential features of the present invention. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. The scope of the present invention is indicated by the scope of the following claims rather than the above description, and all changes or modifications derived from the meaning and scope of the claims and their equivalents are included in the scope of the present invention. Should be interpreted.

1 is a block diagram of an air conditioner according to an embodiment of the present invention.

2 is a block diagram of an air conditioner according to an embodiment of the present invention.

3 is a flowchart illustrating a cooling trial operation method of an air conditioner according to an embodiment of the present invention.

4 is a view illustrating an operating state of an indoor unit according to the cooling test operation method of FIG. 3.

5 is a view showing the temperature change according to the opening and closing of the indoor expansion valve during the cooling operation in the air conditioner according to an embodiment of the present invention.

6 is a flowchart illustrating a heating trial operation method of an air conditioner according to an embodiment of the present invention.

FIG. 7 is a diagram illustrating an operating state of an indoor unit according to the heating trial operation method of FIG. 6.

8 is a view showing the temperature change according to the opening and closing of the indoor expansion valve during the heating operation in the air conditioner according to an embodiment of the present invention.

Claims (12)

A first driving step of opening an expansion valve of some indoor units of the plurality of indoor units in which the expansion valves are all closed; A second driving step of closing the open expansion valve and opening an expansion valve of another indoor unit; And And an air chamber operation step of opening all expansion valves of the plurality of indoor units. The method of claim 1, And a pipe temperature of an indoor unit when the expansion valve is closed and a pipe temperature of the indoor unit when the expansion valve is opened. The method of claim 1, Comparing the piping temperature in the first operation step with the piping temperature in the second operation step, respectively, for the plurality of indoor units in which the expansion valve is closed in the first operation step, And a pipe temperature in the second operation step and a pipe temperature in the all-chamber operation step for the indoor unit in which the expansion valve is closed in the second operation step. The method of claim 2, The indoor unit piping temperature is the air conditioner trial run method of the indoor outlet piping temperature of the indoor heat exchanger. The method of claim 2, And the indoor unit piping temperature is an indoor inlet piping temperature of the indoor heat exchanger. An all-room operation step of opening all expansion valves of the plurality of indoor units in which the expansion valves are all closed; A second driving step of closing expansion valves of some indoor units of the plurality of indoor units in which all of the expansion valves are opened; And And a first operation step of opening the closed expansion valve and closing the expansion valve of another indoor unit. The method of claim 6, And a pipe temperature of an indoor unit when the expansion valve is closed and a pipe temperature of the indoor unit when the expansion valve is opened. The method of claim 6, Comparing the piping temperature in the front room operation step with the piping temperature in the valve check step for the indoor unit in which the expansion valve is closed in the second operation step, And a pipe temperature in the second operation step and a pipe temperature in the first operation step, respectively, for the plurality of indoor units in which the expansion valve is opened in the second operation step. A plurality of indoor heat exchangers through which the refrigerant heat exchanges with the indoor air; A plurality of indoor expansion valves connected to the plurality of indoor heat exchangers, respectively, to throttle the refrigerant; A plurality of indoor piping temperature sensors measuring respective piping temperatures connected to the plurality of indoor heat exchangers; And A control unit for opening the expansion valve of some indoor units of the plurality of indoor heat exchangers and closing the expansion valves of the some indoor units and opening the closed expansion valves of the other indoor units in a state where the expansion valves of some indoor units are closed. Air conditioner comprising a. The method of claim 9, The control unit is an air conditioner for comparing the temperature at the time of closing the expansion valve and the opening of the expansion valve measured by the pipe temperature sensor. The method of claim 9, The indoor pipe temperature sensor is an air conditioner for measuring the temperature of the refrigerant flowing into the indoor heat exchanger. The method of claim 9, The indoor pipe temperature sensor is an air conditioner for measuring the temperature of the refrigerant flowing out of the indoor heat exchanger.

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