KR100743718B1 - Process for confirming wrong connect wire and bad temperature sensor of pipe in multi type air conditioner - Google Patents

Abstract

In the indoor heat exchanger pressure control method of a multi-type air conditioner according to the present invention, a multi-type air conditioner is set by setting a target pressure of an indoor heat exchanger according to a temperature change of an indoor / outdoor, and adjusting a pressure of an indoor heat exchanger according to the target pressure. There is an effect of improving the efficiency.

Description

Process for detecting wrong wiring of multi-type air conditioner and detecting pipe temperature sensor defect of air conditioner {Process for confirming wrong connect wire and bad temperature sensor of pipe in multi type air conditioner}

1 is a schematic perspective view showing a multi-type air conditioner according to the present invention

2 is a block diagram showing an outdoor unit of the multi-type air conditioner according to the present invention

3 is a flow chart illustrating a pipe temperature sensor failure detection method of the air conditioner according to the present invention.

Figure 4 is a flow chart illustrating a detection method of a multi-type air conditioner incorrect wiring communication line according to the present invention

Figure 5 is a schematic configuration diagram showing an outdoor unit of a multi-type air conditioner according to the prior art

6 is a schematic configuration diagram showing a misconnection of a communication line in a multi-type air conditioner according to the prior art;

<Explanation of symbols on main parts of the drawings>

11, 12, 13, 14: indoor unit 21, 22: outdoor unit

51: indoor heat exchanger 54: indoor expansion valve

55, 56, 57, 58: room temperature sensor

61: accumulator 62: inverter compressor

63: constant speed compressor 64: oil separator

65: four-way valve 66: capillary tube

70: outdoor heat exchanger 74: outdoor electromagnetic expansion valve

80: subcooler 82: subcooler

84: bypass piping 85: check valve

86: electromagnetic expansion valve 87: recovery piping

90: liquid injection device

101, 102, 103, 104, 105, 106: temperature sensor

108, 109, 118, 119, 128, 129, 138, 139: Indoor pipe temperature sensor

The present invention relates to a method for detecting a miswired communication line of a multi-type air conditioner and a method for detecting a failure of a pipe temperature sensor of an air conditioner, and more particularly, by comparing a temperature difference between an indoor pipe temperature sensor and a room temperature. The present invention relates to a method for detecting a miswired communication line of a multi-type air conditioner and a pipe temperature sensor defect detection method of an air conditioner.

Conventional multi-type air conditioner is composed of one or more outdoor units and a plurality of indoor units, the indoor unit and the outdoor unit is connected via a refrigerant pipe.

FIG. 5 is a schematic configuration diagram illustrating an outdoor unit of a multi-type air conditioner according to the prior art, and FIG. 6 is a schematic configuration diagram showing a misconnection of a communication line in the multi-type air conditioner according to the prior art.

As illustrated in FIG. 5, the outdoor unit of the multi-type air conditioner according to the related art is compressed by receiving an accumulator 1 for extracting only the gas refrigerant from the refrigerant supplied from the indoor unit and a gas refrigerant extracted from the accumulator 1. A compressor (2), a four-way valve (3) connected to the compressor (2) to select a compressed refrigerant path, and an outdoor heat exchanger for heat-exchanging the refrigerant supplied from the four-way valve (3) with outdoor air ( 4) is configured to include.

As illustrated, the plurality of outdoor units 8 are connected to the plurality of indoor units 9 through a refrigerant pipe.

Thus, when any one of the indoor units 9 of the plurality of indoor units 9 is driven, any one of the outdoor units 8 supplies a refrigerant to the indoor heat exchanger 5 of the indoor unit 9 that is operated to provide indoors. Cool / heat.

On the other hand, the outdoor units 8-1 and 8-2 are shown in FIG. 6 in order to correspond to signals required by specific indoor units 9-1, 9-2, 9-3 and 9-4. As shown, it is connected via the communication line 7.

Therefore, when the user operates any one indoor unit 9-1, the outdoor unit 8-1 connected to the indoor unit 9-1 is operated by the signal input by the user.

However, when the communication lines 7 and 7 'are incorrectly connected as shown in the indoor unit 9-2, the communication line 7' is incorrectly connected even though the user operates the indoor unit 9-2. The refrigerant is not supplied to the indoor unit 9-2, but the refrigerant is supplied to the other indoor unit 9-3.

In addition, if the above situation persists, the user may operate the outdoor unit 8-1 with an excessive load because the room is not controlled to a predetermined temperature according to the user's intention, thereby causing the wrong outdoor unit 8 to be connected. There is a problem that the compressor of -1) is damaged.

In addition, conventionally, when the installer incorrectly connects the communication line in the installation process of the multi-type air conditioner, there is a problem that only one of the indoor units must be driven to check whether it is normally operated.

On the other hand, the indoor unit (9) is provided with a temperature sensor for detecting the temperature of the refrigerant pipe connected to the indoor heat exchanger (5), and if the temperature sensor is incorrectly installed in the cold pipe, the control unit connected to the temperature sensor in the room There is a problem in that the temperature of the heat exchanger 5 cannot be accurately sensed.

In addition, when the temperature sensor of the indoor heat exchanger 5 is incorrectly installed, there is a problem that a separate control method for detecting the same is not implemented.

The present invention has been made to solve the above problems, an object of the present invention is to provide a multi-type air conditioner incorrect connection communication line for detecting the misconnection of the indoor and outdoor unit communication line in the multi-type air conditioner.

Another object of the present invention is to provide a pipe temperature sensor defect detection method of an air conditioner that detects a temperature sensor installed incorrectly in an indoor heat exchanger.

In order to solve the above technical problem, the multi-type air conditioner miswiring communication line detecting method according to the first aspect of the present invention is applied to any one indoor unit 11 when the multi-type air conditioner is operated by cooling or heating (S10). Comparing the temperature difference between the temperature received by the installed indoor temperature sensor 55 and the temperature received by the pipe temperature sensors 108 and 109 of the indoor heat exchanger 51 (S30); When the temperature difference between the indoor temperature sensor 55 and the pipe temperature sensor 108, 109 is within a predetermined temperature T in the temperature comparison step S30, the remaining indoor units 12, 13, 14 Comparing the temperature difference between the pipe temperature sensors 118, 128, 138, 119, 129, and 139 installed in any one of the indoor temperature sensors 56, 57, 58 and the remaining indoor units 12, 13, 14 installed in one of the communication lines. Characterized in that it comprises a communication line check step (S100) to check the incorrect wiring.

And the pipe temperature sensor failure detection method of the air conditioner according to the first aspect of the present invention, when the multi-type air conditioner is operated by cooling or heating (S10), received from the room temperature sensor 55 installed in the indoor unit 11 Comparing the temperature difference between the temperature and the temperature received by the pipe temperature sensors 108 and 109 of the indoor heat exchanger 51 (S30); When the temperature difference between the indoor temperature sensor 55 and the pipe temperature sensor 108, 109 in the temperature comparison step (S30) is within a predetermined temperature (T) to determine the pipe temperature sensor 108, 109 as bad It characterized in that it comprises a step (S60).

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

1 is a schematic perspective view showing a multi-type air conditioner according to the present invention, Figure 2 is a block diagram showing the outdoor unit of the multi-type air conditioner according to the present invention, Figure 3 is a piping temperature of the air conditioner according to the present invention 4 is a flowchart illustrating a sensor failure detection method, and FIG. 4 is a flowchart illustrating a detection method of a multi-type air conditioner incorrect wiring communication line according to the present invention.

As shown in FIG. 1 or 2, the multi-type air conditioner according to the present invention includes a plurality of indoor units 11, 12, 13, 14 installed in the interior of a building, and the indoor units 11, 12. And an outdoor unit (21) 22 connected to (13) (14), and the indoor unit (11) (12) (13) (14) and the outdoor unit (21) (22) are refrigerant pipes (30) ( 40, the outdoor unit 21, 22 is driven by the request of at least one of the indoor unit 11, 12, 13, 14, the indoor unit 11, 12 ( As the cooling / heating capacity required by 13) and 14 increases, the operating number of the outdoor units 21 and 22 and the operating number of compressors installed in the outdoor units 21 and 22 increase.

Here, the indoor units 11, 12, 13, and 14 are indoor heat exchangers 51 for exchanging refrigerant and indoor air, and indoor blowers installed near the indoor heat exchangers 51 to circulate indoor air. 52 and an indoor expansion valve 54 for expanding the refrigerant flowing to the indoor heat exchanger 51 when cooling.

As illustrated in FIG. 2, the outdoor units 21 and 22 receive and compress the accumulator 61 extracting only the gas refrigerant from the refrigerant supplied from the indoor unit and the gas refrigerant extracted from the accumulator 61. The compressor 62 and 63, the four-way valve 65 connected to the compressors 62 and 63 to select a compressed flow path of the refrigerant, and the refrigerant supplied from the four-way valve 65 and the outdoor air are heat exchanged. It is configured to include an outdoor heat exchanger (70).

Here, the compressors 62 and 63 are composed of an inverter compressor 62 capable of varying the compression capacity of the refrigerant, and a constant speed compressor 63 having a constant compression capacity of the refrigerant. An oil separator 64 is installed in the pipe connecting the four-way valve 65, and the oil separator 64 is connected to the suction side of the compressor 62 and 63.

In particular, the oil separator 64 separates oil from the refrigerant discharged from the compressors 62 and 63, and supplies the separated oil to the compressors 62 and 63 to supply the compressors 62 and 63. Maintain an appropriate amount of oil inside. And the suction side pipe of the oil separator 64 and the compressor 62, 63 is connected through a capillary tube 66, the oil is moved through the capillary tube 66.

The refrigerant pipe 30 for guiding the refrigerant discharged from the outdoor heat exchanger 70 to the indoor heat exchanger 51 includes electromagnetic expansion valves lev and 74 for expanding the refrigerant upon heating, and the indoor heat exchange during cooling. Sub-cooling device 80 for cooling the refrigerant moved to the machine 51, and a liquid injection device 90 for lowering the temperature of the compressor (62, 63) is provided.

Here, the outdoor electromagnetic expansion valve 74 is fully open during cooling to allow the refrigerant condensed in the outdoor heat exchanger to pass through without expansion, but when heated, the outdoor electromagnetic expansion valve 74 is opened to a predetermined size to convey the refrigerant condensed in the indoor heat exchanger 51. Before entering the outdoor heat exchanger 70 is expanded to a liquid in a spray state.

And the supercooling device 80 is a subcooler 82 is installed to surround a portion of the refrigerant pipe 30 and the refrigerant pipe 30 connected to the indoor heat exchanger 51 through the subcooler 82. Bypass (84) connected to the bypass pipe (84) for bypassing some of the refrigerant moving in the refrigerant pipe (30) into the subcooler (82), and the electromagnetic expansion valve installed in the bypass pipe (84) And a recovery pipe 87 for connecting the subcooler 82 and the input refrigerant pipe 61 ′ of the accumulator 61.

On the other hand, in order to sense the temperature of the refrigerant flowing in / out of the supercooling device 50, the discharge side refrigerant pipe (30 ") of the subcooler 30 and the electronic expansion valve in the bypass pipe (84) The temperature of the refrigerant is measured in the bypass pipe 86 " installed on the discharge side of the valve 86 and the pipe 87 'provided between the subcooler 82 and the valve 89 in the recovery pipe 87. Temperature sensors 101, 102 and 103 are provided.

In addition, the discharge side refrigerant pipes of the compressors 62 and 63 are provided with temperature sensors 104 and 105 for sensing the temperature of the refrigerant discharged from the compressors 62 and 63 and the accumulator 61. The temperature sensor 106 for sensing the temperature of the refrigerant flowing into the accumulator 61 is also installed at the input side refrigerant pipe 61 ′.

In addition, temperature sensors 108 and 109 are installed on the refrigerant pipes connected to the indoor heat exchangers 51 of the indoor units 11, 12, 13, and 14, and thus the input / output side of the indoor heat exchanger 51 is provided. A temperature sensor 55 for sensing the temperature of the coolant and sensing the temperature of the room is also installed in the indoor units 11, 12, 13, 14.

On the other hand, the refrigerant pipe (30 ") is provided with a dryer (110) for removing moisture in the refrigerant pipe (30"), the refrigerant passing through the dryer 110 is a by-pass in the refrigerant pipe (30 ") Passed and flow to the indoor heat exchanger (51) side.

Hereinafter, a method of detecting a failure of an indoor pipe temperature sensor of a multi-type air conditioner and a detection method of a multi-type air conditioner erroneous communication line will be described in more detail with reference to FIG. 3 or 4.

First, the failure detection method of the indoor pipe temperature sensor of the multi-type air conditioner according to the present invention, as shown in Figure 3, when the multi-type air conditioner is operated by cooling or heating (S10), compressor (62) (63) Maintaining the refrigerant circulated in the multi-type air conditioner by operating for a predetermined time (A) (S20), the indoor temperature sensor 55 and the indoor heat exchanger 51 installed in the indoor unit (11) Comparing the temperature difference between the pipe temperature sensor 108, 109 of (S30) and the temperature difference between the room temperature sensor 55 and the pipe temperature sensor 108, 109 in the temperature comparison step (S30) is a predetermined temperature If it is within (T) is configured to include the step (S60) for determining the pipe temperature sensor 108, 109 as bad.

Here, the temperature comparison step (S30) is for checking whether the pipe temperature sensors 108 and 109 are normally installed, and the temperature detected by the refrigerant pipe when the pipe temperature sensors 108 and 109 are normally installed. Denotes a difference between the room temperature and the predetermined temperature (T) or more.

That is, when the multi-type air conditioner is driven by a heating cycle, the refrigerant supplied to the indoor heat exchanger 51 is formed at a temperature higher than an indoor temperature and supplied to the indoor heat exchanger 51 when driven by a cooling cycle. The coolant is formed at a temperature lower than the room temperature and supplied.

Thus, in the temperature comparison step (S30), it is checked whether the pipe temperature sensors 108 and 109 are normally operated by comparing the temperature difference.

In particular, the temperature comparison step (S30) compares the difference between each of the pipe temperature sensors 108, 109 of the inlet / outlet of the indoor heat exchanger 51 and the room temperature.

More preferably, as shown in FIG. 3, after the temperature comparison step S30, the compressors 62 and 63 are driven for a predetermined time (S40), and the temperature comparison step S50 is performed again. It is determined whether the pipe temperature sensors 108 and 109 are defective.

When the pipe temperature sensors 108 and 109 are determined to be defective (S60), an error signal regarding the pipe temperature sensor 108 and 109 failure is sent to a display device installed in an indoor unit or an outdoor unit of a multi-type air conditioner. (S70)

When the compared temperature difference is greater than the predetermined temperature T in the temperature comparison step S30 or S50, the pipe temperature sensors 108 and 109 are determined to be normal.

Next, the detection method of the multi-type air conditioner incorrect wiring communication line according to the present invention is the rest after the temperature comparison step (S30) (S50) in the pipe temperature sensor failure detection method of the multi-type air conditioner as shown in FIG. A communication line checking step (S100) of determining an incorrect connection of a communication line by determining whether a temperature change occurs in any one of the indoor unit 12, 13, and 14 indoor pipe temperature sensors 118, 128, 138, 119, 129, 139, and the remaining pipes. When the temperature change occurs in any one of the temperature sensors 118, 128, 138 (119, 129, 139), determining that the communication line is incorrectly wired (S110), and an error caused by the error of the communication line in the display device of the indoor unit or the outdoor unit of the multi-type air conditioner. It is configured to further include the step (S120).

Here, the communication line checking step (S100) is an indoor unit (11) (12) (13) (14) and an indoor unit (11) (controlled according to the received signals) in which the respective pipe temperature sensors (108, 118, 128, 138) (109, 119, 129, 139) are installed. 12) (13) (14) to check if they match.

Thus, when there is no temperature change in the pipe temperature sensors 108 and 109 of the indoor unit 11 which is operated when any one of the indoor units 11, 12, 13 and 14 is operated by the user's operation, After receiving the temperature from the pipe temperature sensors 118, 128, 138 (119, 129, 139) of the remaining indoor units 12, 13, 14, the room temperature of each room where the remaining indoor units 12, 13, 14 are installed and the remaining pipe temperature. The temperature received from the sensors 118, 128, 138 (119, 129, 139) is compared to determine whether the temperature difference is greater than or equal to a predetermined size.

Thus, if the difference between the pipe temperature sensor and the room temperature sensors 56, 57, 58 in each of the indoor units 12, 13, 14, respectively, is compared to a predetermined temperature T or more, Judging by the wiring.

That is, in this case, the indoor unit 11 that is operated transmits various indoor data to the indoor unit 21, but the indoor unit 21 is connected to any one of the remaining indoor units 12, 13 and 14 because a communication line is incorrectly connected. By operating the indoor unit 12, 13, 14 of the room not intended by the user to operate the unintentional room is cooled / heated.

Therefore, in the communication line checking step (S100), it is possible to check the connection state of the communication line by comparing the remaining pipe temperature sensor with each room temperature.

More preferably, in the case of the multi-type air conditioner miswiring communication line detection method, it is preferable that the installation is performed in the process of checking after installing the multi-type air conditioner.

Therefore, the detection method of the multi-type air conditioner incorrect wiring communication line according to the present invention compares the difference between the temperature of the room where the indoor unit is operated and the temperature received from the pipe temperature sensor of the indoor unit to be operated. It is effective to judge indoor unit piping temperature sensor as bad.

In addition, the detection method of the multi-type air conditioner incorrect wiring communication line according to the present invention is a communication line when the temperature difference received from the pipe temperature sensor in which the indoor temperature of any one of the remaining indoor units and the remaining indoor units is installed at a communication line checking step is greater than or equal to a predetermined size. There is an effect that can be confirmed that the indoor unit is not intended because of the wrong wiring.

Therefore, the detection method of the multi-type air conditioner incorrect wiring communication line according to the present invention has an effect of more easily confirming the installation state of the multi-type air conditioner by comparing the temperature difference between the indoor unit piping temperature sensor and the room.

In addition, the pipe temperature sensor failure detection method of the air conditioner according to the present invention compares the temperature received from the pipe temperature sensor of the indoor unit with the room temperature to detect a bad or incorrect installation of the pipe temperature sensor to the pipe temperature sensor failure. This is effective in preventing the compressor of the outdoor unit from being excessively driven.

Claims (7)

When the multi-type air conditioner including a plurality of indoor units 11, 12, 13, 14 each having an indoor heat exchanger 51 is operated by cooling or heating (S10), The temperature received from the indoor temperature sensor 55 installed in one indoor unit 11 of the plurality of indoor units 11, 12, 13, 14 and the indoor heat exchanger 51 of the indoor unit 11. Comparing the temperature difference between the temperatures received from the pipe temperature sensors 108 and 109 installed at the inlet or outlet side of the step (S30); When the temperature difference between the room temperature sensor 55 and the pipe temperature sensor 108, 109 in the temperature comparison step (S30) is within a predetermined temperature (T), In the plurality of indoor units 11, 12, 13, 14, the indoor temperature sensors 56, 57, installed in each indoor unit 12, 13, 14 except for the one indoor unit 11. 58 and the temperature difference between the pipe temperature sensors 118, 128, 138, 119, 129, and 139 provided at the inlet side or the outlet side of the indoor heat exchanger 51 of the remaining indoor units 12, 13, 13, respectively. Communication method of the multi-type air conditioner incorrect wiring communication line including a communication line checking step (S100) to check the incorrect wiring. The method according to claim 1, If the temperature difference in the communication line check step (S100) is more than a predetermined temperature (T), determining that the communication line is incorrectly connected (S110). The method according to claim 2, In the detecting method of a miswired communication line of the multi-type air conditioner, if it is determined that the communication line is miswired in the communication line checking step (S100), displaying an error according to the miswired line on at least one of an indoor unit or an outdoor unit. Multi-type air conditioner mis-wire communication line detection method further comprising (S120). The method according to claim 1, In the communication line check step (S100), when the temperature difference is within a predetermined temperature (T), the multi-type air conditioner incorrect wiring communication line is determined to be a bad pipe temperature sensor. The method according to claim 1, When the temperature difference in the temperature comparison step (S30) is within a predetermined temperature (T), a multi-type air conditioner incorrect wiring communication line for performing the temperature comparison step (S50) at least once more after a predetermined time elapsed. The method according to any one of claims 1 to 5, In the temperature comparison step (S30), the pipe temperature sensor is installed at the inlet side and the outlet side of the indoor heat exchanger of the indoor unit, respectively, the comparison of the temperature difference between the inlet side pipe temperature sensor and the room temperature sensor, And a multi-type air conditioner incorrect wiring communication line which is respectively performed between the outlet pipe temperature sensor and the room temperature sensor. When the multi-type air conditioner including a plurality of indoor units 11, 12, 13 and 14 each having an indoor heat exchanger 51 is operated by cooling or heating (S10), The temperature received from the indoor temperature sensor 55 installed in one indoor unit 11 of the plurality of indoor units 11, 12, 13, 14 and the indoor heat exchanger 51 of the indoor unit 11. Comparing the temperature difference between the temperatures received from the pipe temperature sensors 108 and 109 installed at the inlet or outlet side of the step (S30); When the temperature difference between the room temperature sensor 55 and the pipe temperature sensors 108 and 109 is within a predetermined temperature T in the temperature comparison step S30, the pipe temperature sensors 108 and 109 are defective. Defective detection method of the pipe temperature sensor of the air conditioner comprising the step (S60).

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