KR20180085275A - Method for controlling of multi-type air conditioner - Google Patents

Abstract

The present invention relates to a method of controlling a multi-type air conditioner that includes: entering a test driving start for an air conditioner (S10); operating in a cooling driving mode to start the test driving after step S10 (S20); turning on a compressor after step S20 (S30); determining a temperature difference of an indoor pipe during a first set time after step S30 (S40); determining a gap between high and low voltages of a refrigerant pipe during a second set time after step S40 (S50); closing in sequence electronic expansion valves of indoor units after step 50 and determining temperature variations of pipes of the indoor units (S60); and displaying error information according to determination in steps S30, S40, S50, and S60 after step S60 (S70). The method of controlling of a multi-type air conditioner according to the present invention has an effect of checking whether respective devices operate in normal and whether wiring is connected in abnormal, and then providing checked results to an operator during examining the test driving of the air conditioner.

Description

[0001] The present invention relates to a multi-type air conditioner,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control method for a multi-type air conditioner, and more particularly, to a control method for a multi-type air conditioner for diagnosing a faulty test.

The air conditioner is a device for cooling / heating the room or purifying the room air to create a more comfortable indoor environment for the user.

In recent years, the development of a multi-type air conditioner for cooling or heating each room in order to more efficiently cool or heat an indoor space divided into a plurality of rooms has been continuously carried out.

Particularly, in such a multi-type air conditioner, a plurality of indoor units are connected to one outdoor unit, at least one indoor unit is installed in each room, and the indoor unit operates in one of heating and cooling modes to air condition the room.

However, not all of the indoor units are subjected to the heating operation or the cooling operation, the cooling operation is required in some rooms depending on the user's needs, and in some cases, the heating operation is required.

In the case of the multi-type air conditioner, since a plurality of indoor units are installed, there is a problem in that a large number of defects are generated in the installation process even though there is no defect at the time of factory shipment.

Korean Patent No. 10-0447204 B1

SUMMARY OF THE INVENTION It is an object of the present invention to provide a control method of a multi-type air conditioner for diagnosing a test run which detects failure.

An object of the present invention is to provide a control method of a multi-type air conditioner capable of diagnosing not only a defective product but also a failure occurring in the installation process.

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

The control method of a multi-type air conditioner according to the present invention generates a plurality of error codes related to defects generated during installation and defects generated after installation after commissioning, It is possible to display the entire code in a batch and disconnect the test run time.

A method of controlling a multi-type air conditioner according to the present invention includes steps of: (S10) inputting start of a test operation; (S20) operating in a cooling operation mode, for starting commissioning after S10; The step S30 of turning on the compressor after the step S20; Determining (S40) the indoor pipe temperature difference during the first set time after the step S30; A step (S50) of judging the refrigerant pipeline high and low pressure difference for the second set time after the step S30; Closing the electronic expansion valves of the respective indoor units in order after the step S50, and judging the temperature change of the indoor unit piping accordingly (S60); And a step (S70) of collectively displaying error information according to the judgment of the steps S30, S40, S50 and S60 after the step S60.

In step S40, the indoor pipe temperature is sensed after the first set time after detecting the indoor pipe temperature at the start time of the compressor. If the temperature difference is less than the first set value, the refrigerant leakage or the service valve is locked After generating the error code, the error code can be stored in the storage unit of the control unit.

In step S50, the indoor pipe pressure is sensed after the second set time after detecting the indoor pipe pressure at the start time of the compressor, and when the pressure difference is less than the second set value, the error code corresponding to the service valve is locked The error code may be stored in the storage unit of the control unit.

Steps S40 and S50 may be simultaneously performed.

In step S60, the electronic expansion valve disposed in one of the plurality of indoor units is closed, and the temperature of the refrigerant pipe for one of the indoor units is sensed after the fourth predetermined time elapses. If it is less than the third set value, the control unit may store the error code in the storage unit of the control unit after generating a mis-wiring error code for any one of the indoor units.

In step S40, the indoor pipe temperature is sensed after the first set time after detecting the indoor pipe temperature at the start time of the compressor. If the temperature difference is less than the first set value, the refrigerant leakage or the service valve is locked After generating the error code, the error code is stored in the storage unit of the control unit. In step S50, the indoor pipe pressure at the start time of the compressor is sensed, and the indoor pipe pressure is sensed after the second setting time When the pressure difference is less than the second set value, generates an error code corresponding to the service valve lock, stores the error code in the storage unit of the control unit, and in step S60, Closing the electronic expansion valve, sensing the temperature of the refrigerant pipe for any one of the indoor units after the fourth predetermined time has elapsed, S40, S50, or S60, the error code is generated in at least one of the steps S30, S40, S50, and S60, and the error code is stored in the storage unit of the control unit. Error codes can be collectively displayed.

The control method of the multi-type air conditioner according to the present invention has one or more of the following effects.

First, the control method of the multi-type air conditioner according to the present invention has the effect of collectively providing to the operator after inspecting whether the normal operation of each device and the miswiring of the wiring is performed at the time of trial operation diagnosis.

Second, the control method of a multi-type air conditioner according to the present invention can provide an error code to the operator collectively after installation of the product, and the operator can shorten the facility inspection time after confirming the entire error code.

Third, the control method of the multi-type air conditioner according to the present invention has an advantage that it can collectively detect defects generated after the factory shipment.

1 is a configuration diagram of a multi-type air conditioner according to a first embodiment of the present invention.
FIG. 2A is a view illustrating an example of a refrigerant flow in the multi-type air conditioner shown in FIG.
FIG. 2B is a view showing an example of a refrigerant flow during the operation of the heating room in the multi-type air conditioner shown in FIG. 1. FIG.
FIG. 3A is an exemplary view showing the flow of refrigerant during operation of the entire air conditioner main body in the multi-type air conditioner shown in FIG. 1. FIG.
FIG. 3B is an exemplary view showing the flow of refrigerant during operation of the heating main chamber in the multi-type air conditioner shown in FIG.
FIG. 4 is a graph illustrating a test operation control method according to the first embodiment of the present invention.
5 is a flowchart showing a test run control method according to the first embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention, and the manner of achieving them, will be apparent from and elucidated with reference to the embodiments described hereinafter in conjunction with the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. To fully disclose the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout the specification.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a configuration diagram of a multi-type air conditioner according to a first embodiment of the present invention, FIG. 2 (a) is an illustration showing an example of a refrigerant flow in a multi- FIG. 3A is a view showing an example of the refrigerant flow in the multi-type air conditioner shown in FIG. 1 during operation of the entire air conditioner main body in the multi-type air conditioner shown in FIG. 1, FIG. 3 is a diagram illustrating a refrigerant flow during operation of a heating main chamber in the multi-type air conditioner shown in FIG. 1, and FIG. 4 is a graph illustrating a method of controlling the startup operation according to the first embodiment of the present invention. to be.

For convenience of explanation, reference numeral 22 to be described later may mean "22a, 22b, 22c", 24 may mean "24a, 24b, 24c", and 25 means "25a, 25b, 25c" 31 can mean "31a, 31b, 31c", 61 can mean "61a, 61b, 61c", and 62 can mean "62a, 62b, 62c". In the case where components having the same function are provided in each indoor unit as described above, they will not be individually described but only the reference numerals will be described. Also, as the number of indoor units is increased, the number of reference numerals in parentheses can be changed.

The multi-type air conditioner according to the present invention includes an outdoor unit (A), a distributor (B), and a combined indoor unit (D) connected to the distributor (B).

In the case of the combined indoor unit (D), it can be operated simultaneously with cooling or heating.

The configuration of the outdoor unit (A), the distributor (B), and the combined indoor unit (D) will be described.

The compressor 1, the outdoor heat exchanger 2 and the gas-liquid separator 3 are disposed in the outdoor unit A. The guide pipe unit 20 and the valve unit 30 are disposed in the distributor B, An indoor heat exchanger (62) and an electronic expansion valve (61) are disposed in each of the indoor units (D).

Hereinafter, specific embodiments of the outdoor unit (A), the distributor (B) and the indoor unit (D) will be described in order.

The outdoor unit (A) has the following components.

The outdoor unit (A) includes a compressor (1), an outdoor heat exchanger (2), an outdoor fan (2a) for supplying air to the outdoor heat exchanger, A gas-liquid separator (3) for separating the refrigerant discharged from the outdoor heat exchanger (2) into gaseous refrigerant and liquid refrigerant at the time of operation, and a gas-liquid separator (3) connected to the suction side of the compressor And a four-way valve (5) for selectively connecting the compressor (1), the outdoor heat exchanger (2), the distributor (B) and the accumulator (19).

The outdoor unit A includes a first connection pipe 4a for connecting the discharge side of the compressor 1, the outdoor heat exchanger 2 and the gas-liquid separator 3, and the first connection pipe 4a for connecting the distributor B, And a second connection pipe 4b connecting the suction side of the second connection pipe 4b.

The first connection pipe (4a) and the second connection pipe (4b) connect the respective devices via the four-way valve (5).

The four-way valve (5) is connected to the discharge side of the compressor (1), and the flow direction of the refrigerant can be selectively switched according to the operating condition.

The gas-liquid separator 3 is connected to the gaseous refrigerant pipe 11 and the liquid refrigerant pipe 12.

The gas-phase refrigerant pipe 11 connects the upper part of the gas-liquid separator 3 and the distributor B to guide the gas refrigerant, and the liquid refrigerant pipe 12 is connected to the lower part of the gas-liquid separator 3 and the distributor B) to guide the liquid refrigerant.

During the simultaneous operation of all the cooling / cooling bodies, the refrigerant discharged from the outdoor heat exchanger (2) flows into the gas / liquid separator (3) along the first connection pipe (4a) The refrigerant flowing into the outdoor heat exchanger (2) is inflated.

To this end, the first connecting pipe 4a is provided between the outdoor heat exchanger 2 and the gas-liquid separator 3 to interrupt the flow of the refrigerant during the simultaneous operation of the heating front chamber and the heating main body, A first check valve (13) for passing the refrigerant during operation is disposed.

A parallel pipe 14 is disposed in parallel with the first connection pipe 4a with respect to the first check valve 13 and one side of the parallel pipe 14 is connected to the outdoor heat exchanger 2 , And the other side is connected to the gas-liquid separator 3 side.

The parallel piping 14 guides the refrigerant during the simultaneous operation of the heating chamber and the heating body.

The parallel piping is provided with a heating electronic expansion valve (14a), and the heating electronic expansion valve (14a) expands the refrigerant flowing into the outdoor heat exchanger (2) at the time of simultaneous operation of the heating front chamber and the heating main body.

A bypass pipe 16 connecting the first connection pipe 4a and the gaseous refrigerant pipe 11 is disposed and the heating main valve 16a is disposed in the bypass pipe 16. [

The gas refrigerant in the low pressure state supplied from the distributor B flows to the suction side of the compressor 1 along the gaseous refrigerant tube 11 and the bypass piping 16 during the simultaneous operation of the heating body.

Specifically, the bypass pipe 16 is connected to the first connection pipe 4a between the compressor 1 and the outdoor heat exchanger 2, and the other end is connected to the gas refrigerant pipe 11 do.

The heating main valve 16a is opened only when the heating main body is simultaneously operated.

And a second check valve 17 is disposed between the gas-liquid separator 3 and the gaseous refrigerant pipe 11. The second check valve 17 is arranged such that the refrigerant in the distributor B flows into the gas- (3).

The outdoor unit (A) performs the following operation according to the operation condition.

First, in the present embodiment, all-room operation means that the indoor units (D) connected to the distributor (B) operate in the same mode. For example, in the case of the all-cooling operation, it means that the indoor units (D) connected to the distributor (B) are all in the cooling operation. In the case of the all-room heating operation, all the indoor units (D) connected to the distributor (B) are heated.

In the present embodiment, simultaneous operation means that some of the indoor units (D) connected to the distributor (B) are in the cooling operation and some are in the heating operation.

Therefore, the refrigerant in the gaseous phase discharged from the compressor 1 flows into the outdoor heat exchanger 2 via the first connection pipe 4a and the four-way valve 5 at the time of operation of the cooling chamber or simultaneous operation of the cooling body, The refrigerant heat-exchanged in the outdoor heat exchanger continuously flows along the first connection pipe 4a, passes through the first check valve 13, and then flows into the gas-liquid separator 3.

Particularly, at the time of operating the all-cooling operation, the number of revolutions of the outdoor fan 2a is controlled so as to condense all of the refrigerant flowing into the outdoor heat exchanger 2, thereby specifying the refrigerant flowing into the gas-liquid separator 3 as a liquid state .

The refrigerant in the gaseous phase discharged from the compressor 1 flows through the first connection pipe 4a and the four-way valve 5 and then flows through the outdoor heat exchanger 2, Flows into the second connection pipe 4b in a high pressure state and flows to the distributor B along the second connection pipe.

Next, the distributor (B) has the following components.

Prior to the description of the configuration, the refrigerant introduced from the outdoor unit (A) according to the operating conditions must be accurately guided to the selected indoor unit (D).

That is, on the basis of the above-mentioned description, the distributor (B) can be introduced without going through the outdoor heat exchanger (2) and the gas-liquid separator (3) or through the outdoor heat exchanger A guide pipe unit 20 for guiding the refrigerant to the respective indoor units D and redirecting the refrigerant heat-exchanged in the respective indoor units to the outdoor unit A and a plurality of indoor units D And a valve unit 30 for controlling the flow of the refrigerant in the guide pipe unit so that the refrigerant may be selectively introduced into the guide pipe unit.

The guide pipe unit 20 includes a gaseous refrigerant connection pipe 21 connected to the gaseous refrigerant pipe 11 of the outdoor unit to guide the gaseous refrigerant and a gaseous refrigerant connection pipe 21 branched from the gaseous refrigerant connection pipe 21, A liquid refrigerant connection pipe (23) connected to the liquid refrigerant pipe (12) of the outdoor unit and guiding the liquid refrigerant, and a gas refrigerant branch pipe (23) connected to the liquid refrigerant pipe A liquid refrigerant branch pipe 24 connected to each of the indoor units D and a connecting branch pipe 25 branched from each of the gas refrigerant branch pipes 22, And a composite pipe 26 connected to the second connection pipe 4b of the outdoor unit.

 The valve unit 30 is provided in each of the gaseous refrigerant branch pipes 22, the liquid refrigerant branch pipes 24 and the connecting branch pipes 25, Off valve.

The operation of the above-described distributor (B) will be described together in the following description of the entire operation.

Next, each of the combined indoor units D has the following components.

Each of the combined indoor units D includes an indoor heat exchanger 62 and an electronic expansion valve 61 connected between the gaseous refrigerant branch pipe 22 and the liquid refrigerant branch pipe 24, And an indoor fan (not shown) for providing air blowing.

Prior to the description of the operation, it is assumed that the number of indoor units (D) to be combined is three (C1, C2, C3) for convenience of simultaneous operation of the cooling bodies and the simultaneous operation of the heating bodies. C2) performs cooling while the other indoor unit (C3) performs heating. On the other hand, when two heaters (C1, C2) are heated while the other indoor unit (C3) do.

First, as shown in FIG. 2A, the gaseous refrigerant discharged from the compressor 1 flows along the first connection pipe 4a at the time of the operation of the all-cooling room, and is switched to the outdoor heat exchanger (2). At this time, the refrigerant flowing into the outdoor heat exchanger (2) is supercooled by the blow of the outdoor fan (2a) which is optimally driven by the control means, and then is continuously circulated along the first connecting pipe (4a) 13 and then flows into the gas-liquid separator 3.

The refrigerant in the high-pressure / liquid state flowing into the gas-liquid separator 3 is branched into the liquid refrigerant branch pipe 24 through the liquid refrigerant pipe 12 and the liquid refrigerant connecting pipe 23 in sequence, Is expanded while passing through the valve (61), evaporates while passing through the indoor heat exchanger (62), and cools each room.

Thereafter, the evaporated refrigerant travels along the respective gaseous refrigerant branch pipes 22, and is collected into one pipe through the connecting branch pipe 25 by interception of the two-way valves 31a, 31b and 31c, Flows into the connection pipe 4b, flows through the four-way valve 5 which has already been switched and continues to flow along the second connection pipe, and is sucked into the compressor 1 through the accumulator 19.

2B, the gaseous refrigerant discharged from the compressor 1 flows along the first connection pipe 4a at the time of the operation of the all-heating room, and is switched to the outdoor heat exchanger And flows into the second connection pipe 4b in a high pressure state without passing through the second connection pipe 2b.

The gaseous refrigerant flowing into the second connection pipe 4b flows along the composite pipe 26 and is branched into the connection branch pipe 25. The high-pressure / gaseous refrigerant flowing into the branch branch pipe 25 flows into the gaseous refrigerant branch pipe 22 and is heated and condensed while passing through the respective indoor heat exchangers 62. Thereafter, the condensed refrigerant sequentially flows through each of the opened electronic expansion valves 61 and the liquid refrigerant branch pipe 24, is collected in the liquid refrigerant connection pipe 23, and then flows into the liquid refrigerant pipe 12 .

The refrigerant flowing into the liquid coolant pipe 12 flows through the gas-liquid separator 3 and flows along the first connection pipe 4a and flows to the parallel pipe 14 by interrupting the first check valve 13 The refrigerant is expanded in the heating electronic expansion valve 14a provided on the parallel pipe 14 and then introduced into the outdoor heat exchanger 2. The gaseous refrigerant in a low pressure state evaporated in the outdoor heat exchanger 2 flows along the first connection pipe 4a and flows along the second connection pipe 4b through the four- Flows through the accumulator 19, and is sucked into the compressor 1.

3A, the gaseous refrigerant discharged from the compressor 1 flows along the first connection pipe 4a at the time of simultaneous operation of the refrigerant main body, and then the outdoor refrigerant flows through the outdoor heat exchange (2). At this time, the refrigerant flowing into the outdoor heat exchanger (2) flows through the first check valve (4a) along the first connection pipe (4a) after the optimum state is reached by the blowing of the outdoor fan (2a) (13), and then flows into the gas-liquid separator (3).

At this time, the mixing ratio of the refrigerant collected in the gas-liquid separator 3 becomes equal to the mixing ratio of the refrigerant predetermined by the control means described above. Here, the predetermined refrigerant mixture ratio is determined in accordance with two cooling indoor units (C1, C2) requiring liquid refrigerant and one heating indoor unit (C3) requiring gaseous refrigerant as described above, and Which is determined according to various load conditions such as being determined according to the flow rate of the condensed refrigerant flowing into the two cooling indoor units (C1, C2) via one heating indoor unit (C3).

Liquid refrigerant separated in the gas-liquid separator 3 among the refrigerants in the high-pressure / abnormal state (state in which the gas and the liquid are mixed and in the same state as the predetermined mixing ratio) collected in the gas-liquid separator 3 is supplied to the liquid- 12 and the liquid refrigerant connection pipe 23 through the first and second liquid refrigerant branch pipes 24a and 24b sequentially through the first and second electronic expansion valves 61a and 61b, And evaporated while passing through the first and second indoor heat exchangers 62a and 62b, respectively, thereby cooling each room.

At the same time, the gaseous refrigerant separated in the gas-liquid separator 3 flows sequentially through the gaseous refrigerant tube 11 and the gaseous refrigerant connecting tube 21, flows into the selected third gaseous refrigerant branch tube 22c, After heating the room requiring heating while passing through the indoor heat exchanger 62c, the refrigerant is introduced into the liquid refrigerant connecting pipe 23 through the third opened electronic expansion valve 61c and the third liquid refrigerant branch pipe 24c Respectively. As a result, the refrigerant is branched into the first and second liquid refrigerant branch tubes 24a and 24b selected with the liquid refrigerant described above, and then expanded while passing through the first and second electronic expansion valves 61a and 61b, respectively, And evaporates while passing through the indoor heat exchangers 62a and 62b, respectively, and cools each room.

The reason why the liquid refrigerant flows into only the selected first and second liquid refrigerant branch tubes 24a and 24b is because of the pressure difference of the refrigerant. Specifically, the pressure of the refrigerant flowing out of the third liquid refrigerant branch tube 24c Is larger than the pressure of the refrigerant flowing into the first and second liquid refrigerant branch tubes 24a and 24b.

Thereafter, the evaporated refrigerant moves along the first and second gaseous refrigerant branch tubes 22a and 22b and flows through the first and second connecting branch tubes 25a and 25b, respectively, by the interruption of the first and second anisotropic valves 31a and 31b, 25b to flow into the composite pipe 26.

The low-pressure / gaseous refrigerant flowing into the pipe 26 flows along the second connection pipe 4b and flows through the four-way valve 5 which has already been switched and continues to flow through the second connection pipe 4b And then sucked into the compressor 1 through the accumulator 19.

As shown in FIG. 3B, the gaseous refrigerant discharged from the compressor 1 flows along the first connection pipe 4a at the time of simultaneous operation of the heating main body, and is switched to the outdoor heat exchanger And flows into the second connection pipe 4b in a high pressure state without passing through the first connection pipe 2. Then, the gaseous refrigerant flowing into the second connection pipe 4b flows along the composite pipe 26 and is branched into the selected first and second connection branch pipes 25a and 25b.

The high-pressure / gaseous refrigerant flowing into the first and second connection branch tubes 25a and 25b flows into the first and second gaseous refrigerant branch tubes 22a and 22b and then flows into the first and second indoor heat exchangers 62a and 62b, respectively, while heating and heating the respective rooms.

Thereafter, the condensed refrigerant passes through the first and second electronic expansion valves 61a and 61b, the first and second liquid refrigerant branch pipes 24a and 24b, and the liquid refrigerant connection pipe 23, respectively, , A part of the condensed refrigerant flows into the liquid coolant pipe 12 along the liquid coolant connection pipe 23 and the remaining part of the condensed coolant flows into the selected third liquid coolant branch pipe 24c.

That is, a part of the condensed refrigerant flows through the liquid refrigerant connection pipe 23, the liquid refrigerant pipe 12 and the gas-liquid separator 3 in sequence, flows along the first connection pipe 4a, The refrigerant flows to the parallel pipe 14 by interrupting the refrigerant pipe 13 and then is inflated by the heating electronic expansion valve 14a provided on the parallel pipe 14 and flows into the outdoor heat exchanger 2. The gaseous refrigerant in a low pressure state evaporated in the outdoor heat exchanger 2 continues to flow along the first connection pipe 4a and flows through the second connection pipe 4b through the four- And is sucked into the compressor 1 through the accumulator 19.

At the same time, the remaining part of the condensed refrigerant flows into the selected third liquid refrigerant branch tube 24c, is expanded while passing through the third electronic expansion valve 61c, is evaporated through the third indoor heat exchanger 62c, So that a room requiring cooling is cooled. Thereafter, the evaporated refrigerant sequentially flows through the third gaseous refrigerant branch pipe 22c, the gaseous refrigerant connecting pipe 21, and the gaseous refrigerant pipe 11, and by the shutoff of the second check valve 17, Flows into the bypass pipe 16 without passing through the first heating pipe 2, passes through the opened heating main valve 16a, and flows into the first connecting pipe 4a. Then, the refrigerant flows along the first connection pipe 4a and flows along the second connection pipe 4b via the four-way valve 5 which has already been switched and is sucked into the compressor 1 through the accumulator 19 .

The reason why the condensed refrigerant flows into the third liquid refrigerant branch tube 24c which does not flow into the liquid refrigerant branch tube 24a or 24b requiring heating and which needs to be cooled is due to the pressure difference, The pressure of the first and second liquid refrigerant branch tubes 24a and 24c required is larger than the pressure of the third liquid refrigerant branch tube 24c which requires cooling.

FIG. 4 is a graph showing a test operation control method according to the first embodiment of the present invention, and FIG. 5 is a flowchart showing a test operation control method according to the first embodiment of the present invention.

The method for controlling the start-up of a multi-type air conditioner according to the present embodiment includes steps of inputting a start-up operation (S10), operating in a cooling operation mode for starting commissioning after step S10 (S20) A step S30 of turning on the compressor 1, a step S40 of determining an indoor pipe temperature difference during the first set time after the step S30, A step (S50) of judging the refrigerant piping high and low pressure difference, a step (S60) of closing the electronic expansion valves of the respective indoor units in order after the step S50, (Step S70) of collectively displaying error information according to the determination of steps S30, S40, S50, and S60.

The step S10 is performed through an operator's input. The operator can select and input the above step S10 through the wired or wireless remote controller of the indoor unit or the control panel of the outdoor unit.

In step S20, the control unit operates the multi-type air conditioner in the cooling operation mode. In step S20, the indoor units are operated in all room cooling mode.

After step S20, the indoor fan (not shown) of the indoor unit is maintained as a strong wind.

In step S30, the control unit turns on the compressor 1, and when a plurality of compressors are arranged, the plurality of compressors are sequentially turned on. If an error occurs during operation of the compressor 1 in step S30, the controller stores the generated error code in a storage unit (not shown).

In step S30, an ON signal and an OFF signal are transmitted to the electronic expansion valves of the respective indoor units, and it is determined whether the respective electronic expansion valves are connected.

In step S40, the control unit senses the temperature difference of the indoor pipe for the first set time after step S30 and determines the difference.

In step S40, the indoor pipe temperature at the start time of the compressor 1 is sensed, and the indoor pipe temperature after the first predetermined time is sensed. The first set time is a time point which is four minutes after starting the compressor 1 in the present embodiment.

The indoor pipe refers to a refrigerant pipe connected to the indoor unit, and in the present embodiment, it may be a liquid refrigerant connection pipe 23 or a liquid refrigerant branch pipe 24. The plurality of liquid refrigerant branch pipes 24 are connected to the liquid refrigerant connecting pipe 23 so that the refrigerant temperature of the liquid refrigerant connecting pipe 23 is sensed.

If it is determined in step S40 that the temperature difference is less than the first set value, it is determined that the refrigerant supplied to the indoor unit is leaked or the service valves 11a and 12a are locked and the refrigerant is not supplied to the indoor unit. The service valves 11a and 12a are valves that connect the outdoor unit A and the distributor B and are disposed in the gaseous refrigerant pipe 11 and the liquid refrigerant pipe 12 in the present embodiment.

That is, when the temperature difference of the refrigerant pipe of the indoor unit is not formed to be equal to or larger than the first set value despite the compressor 1 being driven, it can be judged that the refrigerant is not sufficiently supplied or the refrigerant is not supplied at all.

If the temperature difference is less than the first set value in step S40, an error code corresponding thereto is stored.

In step S50, the controller senses the high pressure and the low pressure of the cold storage pipe for the second set time, and determines the high pressure and the low pressure. In step S50, the controller senses the pressure (through the pressure sensor 61) of the liquid refrigerant tube 23 or the liquid refrigerant branch tube 24 and the pressure (pressure sensor 62) Lt; / RTI >

The second set time may be the same as the first set time. The step S50 may be performed simultaneously with the step S40. The step S50 may be performed after the step S30.

If it is determined in step S50 that the pressure difference is less than the second set value, it is determined that the refrigerant is not supplied to the indoor unit by locking the service valve 11a (12a).

The second set value may be formed differently depending on the capacity of the compressor and the capacity of the indoor unit. The second set value is a pressure difference that can be generated when normal refrigerant is evaporated in the indoor unit.

Even if the compressor 1 is driven, if the pressure difference of the indoor unit refrigerant pipe is not equal to or greater than the second set value, it can be determined that the refrigerant is not supplied at all by locking the service valve.

If the pressure difference is less than the second set value in step S50, an error code corresponding thereto is stored.

The operation frequency of the compressor may be set differently in the steps S40 and S50. For example, in step S40, the compressor is maintained at the first operating frequency and then maintained in the second operating frequency higher than the first operating frequency in step S50.

The first operation frequency and the second operation frequency are formed to be lower than the third operation frequency in step S60.

In step S60, the control unit sequentially opens and closes the electronic expansion valves 61a, 61b, and 61c disposed in the respective indoor units, and determines this. The step S60 is performed after the start of the compressor 1 and after the elapse of the third set time. The step S60 is performed after the start of the control of the compressor 1 after the start of the on-time control.

In the present embodiment, the third set time is 5 minutes.

In step S60, the control unit closes the electronic expansion valve 61a of the first indoor unit C1 in the full open state with 0 pulse, waits for the fourth set time, waits for the fourth set time, Detects the temperature, and determines whether the sensed temperature difference is less than the third set value.

When the electronic expansion valve 61a of the first indoor unit C1 is closed, the supply of the refrigerant to the first indoor heat exchanger 62a is interrupted, thereby evaporating the refrigerant in the first indoor heat exchanger 62a It does not. If there is no evaporation of the refrigerant, the temperature of the first indoor unit refrigerant pipe is increased.

Therefore, when the temperature difference is not formed below the third set value, it can be determined that the first electronic expansion valve 62a is not normally closed.

If the closing signal of the electronic expansion valve is transmitted in step S60 and the electronic expansion valve of the indoor unit is not normally controlled, it can be determined that the wiring for transmitting the control signal is erroneously connected.

In step S60, when the indoor unit refrigerant pipe is sensed after waiting for the fourth predetermined time, the refrigerant pipe temperature of the entire indoor unit can be sensed. In this case, when the temperature difference of the indoor unit to be controlled is substantially unchanged and the temperature difference of one of the indoor units other than the control object is formed to be equal to or higher than the third set value, the indoor unit having the miswiring can be detected.

In step 60, the electronic expansion valves 61b and 61c are opened and closed for the second indoor unit C2 and the third indoor unit C3 in order, and an error code according to the miswiring is stored.

In step S70, the control unit collectively displays error codes generated in at least one of S30, S40, S50, and S60.

The error code in step S70 may be displayed on the control panel of the wired remote controller, the wireless remote controller, or the outdoor unit of the indoor unit.

Reference numerals 51, 52, 55a, 55b and 55c denote temperature sensors. Reference numerals 61 and 62 denote pressure sensors. In the multi-type air conditioner according to the present embodiment, a plurality of temperature sensors and pressure sensors may be disposed so as to sense temperature or pressure of the outdoor unit, the distributor unit, and the indoor unit.

As described above, the control method of the multi-type air conditioner according to the present embodiment has the effect of collectively providing to the operator after inspecting whether or not the normal operation of each device and the miswiring of the wiring is performed at the time of pre-

Since the error code is provided to the operator collectively after the installation of the product, the operator can drastically shorten the facility inspection time after confirming the error code.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It is to be understood that the invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive.

1: compressor 2: outdoor heat exchanger
3: gas-liquid separator 4a: first connection pipe
4b: Second connection piping 5: Four-way valve
11: Gaseous refrigerant tube 12: Liquid refrigerant tube
21: Gaseous refrigerant connection pipe 22: Gaseous refrigerant branch pipe
23: liquid phase refrigerant connection pipe 24: liquid phase refrigerant branch pipe
25: connection branch pipe 26: composite pipe
31: anisotropic valve 32: anisotropic valve
61: Electronic expansion valve 62: Indoor heat exchanger

Claims (6)

A method for controlling a multi-type air conditioner,
A step (S10) of inputting a start of a test operation;
(S20) operating in a cooling operation mode, for starting commissioning after S10;
The step S30 of turning on the compressor after the step S20;
Determining (S40) the indoor pipe temperature difference during the first set time after the step S30;
A step (S50) of judging the refrigerant pipeline high and low pressure difference for the second set time after the step S30;
Closing the electronic expansion valves of the respective indoor units in order after the step S50, and judging the temperature change of the indoor unit piping accordingly (S60);
And a step (S70) of collectively displaying error information according to the determination in steps S30, S40, S50, and S60 after step S60. The method according to claim 1,
In operation S40,
The indoor pipe temperature is sensed after the first set time after the indoor pipe temperature at the start time of the compressor is sensed and the error code corresponding to the refrigerant leakage or the service valve is generated when the temperature difference is less than the first set value And storing the error code in a storage unit of the control unit. The method according to claim 1,
In operation S50,
The controller detects the indoor pipe pressure at the start time of the compressor, detects the indoor pipe pressure after the second set time, generates an error code corresponding to the service valve lock when the pressure difference is less than the second set value, And stores the error code in the storage unit of the control unit. The method according to claim 1,
The steps S40 and S50 are simultaneously performed. The method according to claim 1,
In operation S60,
Closing the electronic expansion valve disposed in any one indoor unit of the plurality of indoor units and detecting the temperature of the refrigerant pipe for any of the indoor units after the fourth predetermined time has elapsed, The control unit generates a mis-wiring error code for any of the indoor units, and stores the error code in the storage unit of the control unit. The method according to claim 1,
In operation S40,
The indoor pipe temperature is sensed after the first set time after the indoor pipe temperature at the start time of the compressor is sensed and the error code corresponding to the refrigerant leakage or the service valve is generated when the temperature difference is less than the first set value The error code is stored in the storage unit of the control unit,
In operation S50,
The controller detects the indoor pipe pressure at the start time of the compressor, detects the indoor pipe pressure after the second set time, generates an error code corresponding to the service valve lock when the pressure difference is less than the second set value, Stores the error code in the storage unit of the control unit,
In operation S60,
Closing the electronic expansion valve disposed in any one indoor unit of the plurality of indoor units and detecting the temperature of the refrigerant pipe for any of the indoor units after the fourth predetermined time has elapsed, The control unit generates a mis-wiring error code for any of the indoor units, stores the error code in the storage unit of the control unit,
In the step S70, the error codes generated in at least one of the steps S30, S40, S50, and S60 are collectively displayed.

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