JPH06281301A - Air conditioner - Google Patents

Abstract

PURPOSE:To provide an air conditioner which achieves working efficiency in the installation by making possible the capturing and the reporting of whether a piping connection and a signal line connection are normal or not in multiple systems of refrigerating cycles arranged in an outdoor unit and room units accurately even covering the specific details of mispiping and miswiring. CONSTITUTION:Pressure sensors are provided respectively on suction pipes of compressors 4 and 5 in a plurality of systems of refrigerating cycles and temperature sensors 44 and 45 on room heat exchangers 28 and 29 respectively to monitor the results of detection of the pressure sensors and temperature sensors. Thus, it is judged whether a piping connection and signal line connection are normal or not between an outdoor unit 1 and the refrigerating cycles of room units 2 and 3. A display device 53 is provided to report the results of the judgment in terms of the contents.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-type air conditioner having one outdoor unit, a plurality of indoor units and a plurality of refrigeration cycles.

[0002]

2. Description of the Related Art One outdoor unit is equipped with a plurality of compressors and an outdoor heat exchanger, and each of a plurality of indoor units is equipped with an indoor heat exchanger, and the compressor, the outdoor heat exchanger, and the indoor heat exchange are provided. There is known an air conditioner having a plurality of refrigeration cycles connected to each other. In this type of air conditioner, it is common to make a pipe connection and a signal line connection at the time of installation in a building.

[0003]

However, as described above, in an air conditioner equipped with a plurality of indoor units and a plurality of refrigeration cycles, an inadvertent error is made when connecting pipes and signal lines during installation. May occur.

If such an erroneous connection occurs, it is naturally difficult to operate properly. That is, abnormal stop occurs due to a secondary factor such as a high pressure abnormality or a low pressure abnormality.

If the operation and the abnormal stop are repeated many times without understanding the cause, the compressor lubricating oil between the refrigeration cycles becomes uneven, and the compressor finally fails. It was

Therefore, after the installation is completed, the worker needs to operate the remote controller of each indoor unit to operate each indoor unit independently and check the pipe connection and signal line connection for correctness. However, in the above check,
The worker has to go to the installation location of each indoor unit many times, which is troublesome and very troublesome.

The present invention has been made under such circumstances, and an object of the present invention is to normally connect pipes and signal lines of a plurality of refrigeration cycles arranged in an outdoor unit and each indoor unit. Provided is an air conditioner which can accurately and accurately inform and notify even the specific contents of erroneous piping and erroneous wiring, and can improve work efficiency during installation.

[0008]

[Means for Solving the Problems] To achieve the above object, the first invention is

[0009] One outdoor unit is provided with a plurality of compressors and a plurality of outdoor heat exchangers, and a plurality of indoor units is provided with an indoor heat exchanger, respectively, and the compressor, the outdoor heat exchanger and the indoor unit are provided. In an air conditioner having a plurality of refrigeration cycles by connecting heat exchangers, a pressure sensor provided in each suction pipe of each compressor, and a temperature sensor provided in each indoor heat exchanger,

Means for monitoring the detection results of each pressure sensor and temperature sensor and determining whether or not the pipe connection and signal line connection between the outdoor unit and each indoor unit between the refrigeration cycles are normal, and the result of this determination is notified. An air conditioner characterized by comprising display means. The second invention is

A single outdoor unit is provided with a plurality of compressors and a plurality of outdoor heat exchangers, and a plurality of indoor units is provided with an indoor heat exchanger, respectively, and the compressor, the outdoor heat exchanger and the indoor unit are provided. In an air conditioner having a plurality of refrigeration cycles connected to a heat exchanger, a check mode for operating one of the refrigeration cycles and stopping the other refrigeration cycle, and a means for setting the check mode When setting, a means for detecting the suction pressure of each compressor and the temperature of each indoor heat exchanger,

By monitoring the detection results of each pressure sensor and temperature sensor, it is possible to check the normal piping connection and signal line connection between the outdoor unit and each indoor unit between the refrigeration cycle, the incorrect piping in the normal wiring, and the incorrect piping in the incorrect wiring. The air conditioner is provided with a means for judging the contents and a display means for notifying the judgment results by contents. The third invention is

A plurality of compressors and a plurality of outdoor heat exchangers are provided in one outdoor unit, and indoor side heat exchangers are provided in a plurality of indoor units, respectively, and the compressor, the outdoor heat exchanger and the indoor unit are provided. In an air conditioner having a plurality of refrigeration cycles connected to heat exchangers, the suction pressures Pa0, Pbo of the compressors and the temperatures Ta0, Tb0 of the indoor heat exchangers are set in a stopped state of each refrigeration cycle. For detecting, and storing as data sampling, means for setting a check mode for operating one of the refrigeration cycles and stopping the other refrigeration cycle, and at the time of setting this check mode,
Detecting the suction pressure Pb of the compressor in the stop side refrigeration cycle,
A means for comparing the stored suction pressure Pb0 with Pb <Pbo
Is No, means for comparing Pb> Pb0 and Pb
When> Pb0 is No, a means for detecting the temperature Tb of the indoor heat exchanger in the stop side refrigeration cycle and comparing it with the stored temperature Tb0, and when Tb <Tb0 is No, it is judged as normal wiring and normal piping (... 2) means for displaying the contents thereof, and means for judging that the gas pipes are erroneous pipes and the liquid pipes are erroneous pipes with normal wiring when Tb <Tb0 is Yes (FIG. 5) and the contents thereof. Means for displaying and Pb>
Means for comparing Tb and Tb0 when Pb0 is Yes,
When Tb <Tb0 is No, a means of judging that the gas pipe is erroneous piping with normal wiring (Fig. 3) and a means for displaying the contents, and when Tb <Tb0 is Yes, the wiring is erroneous with normal wiring and liquid pipe error. Means for judging as piping (Fig. 4), means for displaying the contents, and when Pb <Pb0 is Yes,
Means to compare Tb and Tb0 and Tb <Tbo is Yes
At this time, means for detecting the suction pressure Pa of the compressor in the driving side refrigeration cycle and comparing it with the stored temperature Pa0, Pa> P
When a0 is No, it is judged as normal piping due to incorrect wiring (... Fig. 6)
Means for displaying, and means for displaying the contents, Pa> P
When a0 is Yes, there is a means for erroneously wiring and determining that the gas pipe is erroneous piping (Fig. 7), a means for displaying the content, and a means for comparing Pa and Pa0 when Tb <Tb0 is No. , Pa> Pa 0 is Yes, miswiring causes
A means for judging that the liquid pipe is erroneous piping (Fig. 8) and a means for displaying the content thereof, and when Pa> Pa0 is No, it is judged by miswiring that the gas pipe is erroneous pipe or the liquid pipe erroneous pipe (... Fig. 9). ) And a means for displaying the contents thereof, the air conditioner.

[0014]

[Function] A plurality of refrigeration cycles are provided, one refrigeration cycle is operated, and the suction pressure sensor of each compressor and the temperature of the indoor heat exchanger are detected to detect the temperature between the outdoor unit and each indoor unit. It is determined whether the pipe connection and the signal line connection are normal, and the determination result is notified.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. As shown in FIG. 1, one outdoor unit 1
And two indoor units 2 and 3 are provided.

Two compressors 4 and 5 are arranged in the outdoor unit 1. Outdoor heat exchangers 8 and 9 are connected to the discharge parts of the compressors 4 and 5 via four-way valves 6 and 7,
Outdoor blowers 10 and 11 are arranged to face these.
The outdoor heat exchangers 8 and 9 include heating expansion valves 12 and 13, respectively.
And a parallel circuit of the check valves 14 and 15 for forming a cooling cycle, and the liquid pipe packed valves 16 and 17 are connected. Gas pipe packed valves A18, B19 are connected to the suction portions of the compressors 4, 5 via four-way valves 6, 7.

On the other hand, the indoor units 2 and 3 are provided with liquid pipe unions A20 and B21, respectively, in which expansion valves 24 and 25 for cooling and check valves 26 and 27 for forming a heating cycle are provided.
Are connected to the indoor heat exchangers 28 and 29 and the gas pipe packed valves 22A and B23.

Liquid pipe packed valve A1 of the outdoor unit 1
6, B17 and liquid pipe union A of each indoor unit 2, 3
20 and B21 are connected via connecting pipes 32 and 33, respectively. Further, the gas pipe packed valves A18 and B19 of the outdoor unit 1 and the gas pipe unions A22 and B23 of the indoor units 2 and 3 are connected via connecting pipes 34 and 35, respectively. Therefore, this air conditioner includes one outdoor unit 1 and two indoor units 2,
In this case, two heat pump refrigeration cycles will be configured. For convenience of explanation, in the drawings, the upper stage side is referred to as a unit A and the lower stage side is referred to as a unit B.

The indoor unit 1 on the unit A side has an electric parts box 36 including electric parts for drive power source and electric parts for control.
The indoor unit 1 on the B-unit side is also provided with an electrical component box 37 including similar electrical components, and is connected to each other via an in-unit wiring 46. Further, the indoor units 2 and 3 are also provided with electric component boxes 38 and 39, respectively, and are connected to each other via the crossover wires 40 and 41. The suction pipes of the compressors 4 and 5 are provided with pressure sensors 42 and 43 for detecting the suction pressure, respectively. The indoor heat exchangers 28 and 29 are provided with temperature sensors 44 and 45, respectively, which detect the heat exchanger temperatures.

Because of such an air conditioner, during the cooling operation, the refrigerant is guided in the direction indicated by the solid line arrow in the figure to form a cooling cycle, and during the heating operation, the refrigerant is directed in the direction indicated by the broken line arrow in the figure. Guided to form a heating cycle. The control circuit is shown in FIG. The outdoor unit 1 includes an outdoor control unit 50 including a microcomputer and its peripheral circuits.

In the outdoor control unit 50, the inverter circuit 5
1, 52, a notification device 53 as a notification means, and a check switch 54 for setting a check mode.
Are connected.

The inverter circuits 51, 52 rectify the voltage of the AC power supply 55 and convert it into an AC voltage of a predetermined frequency (and level) according to a command from the outdoor control unit 50, and the compressor motors 4M, 5M. Are supplied to each as drive power. The indicator 54 has two types of light emitting diodes for indicating that the piping and wiring connection are normal and that there is an error in different colors. Here, it is composed of 1 this light emitting diode which emits light indicating that it is normal, and 7 this light emitting diode which emits light indicating that it is abnormal for each type. Further, the four-way valves 6 and 7 and the pressure sensors 42 and 43 are connected to the outdoor control unit 50. The outdoor units 2 and 3 are provided with indoor control units 60 and 70 each including a microcomputer and its peripheral circuits.

Each of the indoor control units 60, 70 includes a remote control type operation unit 61, 71, indoor temperature sensors 62, 72 and the heat exchanger temperature sensor 44,
45 is connected. Then, each indoor control unit 60, 70
Has the following functional means. (1) A means for sending a command signal such as operating conditions based on the operation of the operation units 61, 71 to the outdoor control unit 50. (2) Frequency setting signal f1
, F2 to the outdoor control unit 50. (3) Indoor heat exchanger 2 detected by temperature sensors 44 and 45
A means for sending the temperatures of 8 and 29 to the outdoor control unit 50. The outdoor control unit 50 includes the following functional means.

(1) Means for controlling the number of operating compressors 4 and 5 and the operating frequency F (output frequency of the inverter circuits 51 and 52) according to the operating command and the frequency setting signal f0 from the indoor control units 60 and 70. . (2) A means for switching and controlling the four-way valves 6 and 7 according to the operation control command from the indoor control units 60 and 70.

(3) Check switch 54 when operation is stopped
A means for setting the check mode in response to the ON operation of, and starting the operation of either one of the compressors 4 or 5 (here, the compressor A on the No. A side).

(4) When this check mode is set, the detection signals of the pressure sensors 42 and 43 and the indoor control units 60 and 7
0, the detection signals of the temperature sensors 44 and 45 are received,
The presence or absence of abnormality is judged, and the display 53 is
Means to control the display of. Next, the operation of the above configuration will be described with reference to the flowchart of FIG.

When the installation of the air conditioner is completed, step 1 is reached, and while the refrigeration cycle of each system is stopped, the pressure sensors 42 and 43 cause the suction pressures Pa0 and Pb0 of the compressors 4 and 5 of the respective units. Is detected and the data sampling value Pa0 = P
It is stored as a, Pb0 = Pb.

At the same time, the temperature sensors 42 and 43 detect the temperatures Ta0 and Tb0 of the indoor heat exchangers 28 and 29 of the respective units, and store them as data sampling values Ta0 = Ta and Tb0 = Tb. In step 2, when the check switch 54 of the outdoor control unit 50 is turned on, the check mode is set.

In this check mode, one refrigerating cycle is started and the other refrigerating cycle is stopped as it is. Here, the operation of the unit A is started and the unit B is stopped as it is. In step 3, the suction pressure Pb of the compressor 5 in the stop side refrigeration cycle is compared with the stored suction pressure Pb0. That is, the comparison judgment of Pb <Pb0 is made. When Pb <Pb0 is No, it means that at least the compressor 5 on the No. B side is not operating and the wiring is normal. Moving to step 4, the comparison judgment of Pb> Pb0 is made this time.

If Pb <Pb0 is No in the previous step 3, the remaining conditions are Pb> Pbo or Pb = P
b0. That is, when the wiring is normal, the piping is normal, or the gas pipe wrong pipe and the liquid pipe wrong pipe are discriminated, and when the wiring is normal, the gas pipe wrong pipe or the liquid pipe wrong pipe is monitored.

If Pb> Pbo is No in step 4, Pb = Pb0 remains, and then the process proceeds to step 5 to detect the temperature Tb of the indoor heat exchanger in the stop side refrigeration cycle and store the stored temperature Tb0. And are compared.

That is, when Tb <Tb0 is compared, and the result is No, the refrigerant is the indoor heat exchanger 2 on the side of Unit B.
9 has not been introduced, in other words, the indoor heat exchanger 28 on the Unit A side is performing the cooling action, and it is determined that the wiring is normal and the piping is normal. The resulting signal is sent to the display unit 53, and the contents thereof are displayed. Actually, as shown in FIG. 2, the connecting wires 40 and 41 and the connecting pipes 32 to 35 are normally connected.

On the other hand, Tb <Tb0 in step 5
If the result is Yes, the temperature of the indoor heat exchanger 29 has dropped even though the wiring is normal, and it is determined that the gas pipe is erroneous and the liquid pipe is erroneous. The resulting signal is sent to the display unit 53, and the contents thereof are displayed.

Actually, as shown in FIG.
Although 0 and 41 are normally connected, the liquid pipe packed valve A16 of the outdoor unit 1 and the liquid pipe union B21 of the indoor unit 3 are connected by the wrong liquid pipe 32a, and the gas pipe packed valve A18 of the outdoor unit 1 is connected. Then, the gas pipe union B23 of the indoor unit 3 is connected by the erroneous gas pipe 35a.

Further, the liquid pipe packed valve B17 of the outdoor unit 1 and the liquid pipe union A20 of the indoor unit 2 are connected by a wrong liquid pipe 33a, and the gas pipe packed valve B19 of the outdoor unit 1 and the gas pipe of the indoor unit 2 are connected. Union A
22 is connected by an erroneous gas pipe 34a. When Pb> Pb0 is Yes in step 4 above, the process proceeds to step 6 and T
b and Tb0 are compared. That is, Tb <Tb0 is compared and judged. When Tb <Tb0 is No, it is determined that the gas pipe is erroneous pipe even though the wiring is normal, and the content is displayed on the display 53.

Actually, as shown in FIG.
41 is a normal connection, and the liquid pipe packed valve A16 of the outdoor unit 1 and the liquid pipe union A20 of the indoor unit 2 are normal crossover pipes 32, and the liquid pipe packed valve B17 of the outdoor unit 1 and the indoor unit The liquid pipe union B21 of No. 3 is connected by a normal crossover pipe 33.

On the other hand, the gas pipe packed valve A18 of the outdoor unit 1 and the gas pipe union B23 of the indoor unit 3 are connected by the wrong gas pipe 35a, and the packed valve B19 of the outdoor unit 1 and the gas pipe of the indoor unit 2 are connected. The union A22 is connected by the erroneous gas pipe 34a. Further, when Tb <Tb0 is Yes in step 6, it is judged that the liquid pipe is erroneous pipe even though the wiring is normal, and the content is displayed on the display 53.

Actually, as shown in FIG.
41 is a normal connection, and the gas pipe packed valve A18 of the outdoor unit 1 and the gas pipe union A22 of the indoor unit 2 are normal connecting pipes 34, and the gas pipe packed valve B19 of the outdoor unit 1 and the indoor unit 3 The gas pipe union B23 is connected with a normal crossover pipe 35.

On the other hand, the liquid pipe packed valve A16 of the outdoor unit 1 and the liquid pipe union B2 of the indoor unit 3
1 is connected by an erroneous liquid pipe 32a, and the packed valve B17 of the outdoor unit 1 and the liquid pipe union A2 of the indoor unit 2 are connected.
0 is connected by the erroneous liquid pipe 33a.

On the other hand, in step 3, Pb <Pb0 is Ye
When the result is s, it can be seen that miswiring is made, the compressor 4 of the unit A stops, and the compressor 5 of the unit B operates.

Then, in the state of incorrect wiring, the process proceeds to step 7 and Tb and Tb0 are compared and monitored. That is, here, in the mis-wiring state, the pipe is normal or the gas pipe mis-pipe is discriminated, and in the mis-wiring state, the liquid pipe mis-pipe, the gas pipe mis-pipe and the liquid pipe mis-pipe are discriminated.

In step 7, when Tb <Tb0 is Yes, the process proceeds to step 8 to detect the suction pressure Pa of the compressor in the operation side refrigeration cycle and compare it with the stored suction pressure Pa0.

Here, when Pa> Pa0 is No, it is determined that there is only incorrect wiring, and the refrigerant is normal piping that is guided to the indoor heat exchanger 29 of Unit B, and the content is displayed on the display 53. .

Actually, as shown in FIG. 6, the outdoor unit 1
The electric component box 36 on the unit A side is mis-wired 41a to the electric component box 39 on the indoor unit 3, and the electric component box 37 on the unit B side of the outdoor unit 1 is arranged on the electric component box 38 of the indoor unit 2.
Is erroneously wired 40a, and all the pipes constituting the refrigeration cycle are normal. In step 8, when Pa> Pa0 is Yes, it is determined that the gas pipe is erroneous due to incorrect wiring, and the content is displayed on the display 53.

As shown in FIG. 7, the outdoor unit 1 is actually used.
The electric component box 36 on the unit A side is mis-wired 41a to the electric component box 39 on the indoor unit 3, and the electric component box 37 on the unit B side of the outdoor unit 1 is arranged on the electric component box 38 of the indoor unit 2.
Is erroneously wired 40a.

The connecting pipe 32 and the connecting pipe 33 are normally connected. However, the gas pipe packed valve A18 of the outdoor unit 1 and the gas pipe union B23 of the indoor unit 3 are connected.
Are connected by the wrong gas pipe 35a, and the packed valve B19 of the outdoor unit 1 and the gas pipe union A of the indoor unit 3 are connected.
22 is connected by an erroneous gas pipe 34a. Step 7 above
Then, when Tb <Tb0 is No, the routine proceeds to step 9, where Pa and Pa0 are compared and monitored, and Pa> Pa0 is judged. When Pa> Pa0 is Yes in step 9,
In the state of incorrect wiring, it is determined that the liquid pipe is erroneous piping, and the content is displayed on the display 53.

Actually, as shown in FIG. 8, the electrical component box 36 of the outdoor unit 1 on the unit A side is erroneously wired 41a to the electrical component box 39 of the indoor unit 3, and the electrical components on the unit B side of the outdoor unit 1 are arranged. Box 37 is the electrical component box 3 of the indoor unit 2.
8 is erroneously wired 40a, but crossover pipe 34 and crossover pipe 3
No. 5 is normally connected.

However, the liquid pipe packed valve A16 of the outdoor unit 1 and the gas pipe union B22 of the indoor unit 3
Are connected by the wrong liquid pipe 32a, and the packed valve B17 of the outdoor unit 1 and the liquid pipe union A of the indoor unit 2 are connected.
20 is connected by the erroneous liquid pipe 33a. In step 9, P
When a> Pa0 is No, the mis-wiring state is determined to be gas pipe mis-wiring and liquid pipe mis-piping, and the details are displayed on the display unit 53.
Is displayed in.

Actually, as shown in FIG. 9, the electrical component box 36 of the outdoor unit 1 on the unit A side is mis-wired 41a to the electrical component box 39 of the indoor unit 3, and the electrical component box of the outdoor unit 1 on the unit B side is electrically wired. Box 37 is the electrical component box 3 of the indoor unit 2.
8 is erroneously wired 40a.

The liquid pipe packed valve A16 of the outdoor unit 1 and the liquid pipe union B22 of the indoor unit 3 are connected by the wrong liquid pipe 32a, and the gas pipe packed valve A18 of the outdoor unit 1 and the gas pipe of the indoor unit 3 are connected. The union B23 is connected by the erroneous gas pipe 35a.

Furthermore, the liquid pipe packed valve B17 of the outdoor unit 1 and the liquid pipe union A20 of the indoor unit 2 are connected by the wrong liquid pipe 33a, and the gas pipe packed valve B19 of the outdoor unit 1 and the gas pipe of the indoor unit 2 are connected. The union A22 is connected by the erroneous gas pipe 34a. In this way, if it is normal, that fact is judged, and if it is abnormal, the respective contents are judged and displayed separately for the piping abnormality and the wiring abnormality, so that the operator can work very easily.

[0052]

EFFECT OF THE INVENTION One outdoor unit and a plurality of indoor units are provided with a plurality of refrigerating cycles, the suction pressure of each compressor is detected, and the temperature of each indoor heat exchanger is detected.
Since it is determined whether the pipe connection and the signal line connection between the respective refrigeration cycles are normal, and the result of the determination is displayed,

Whether or not the piping connection and signal line connection of the refrigeration cycle of a plurality of systems are normal or not can be accurately determined, and erroneous piping can be performed.
The specific contents of miswiring can be automatically captured and notified to improve work efficiency during installation.

Therefore, as in the conventional case, the operation and the abnormal stop are repeated many times without knowing the cause of the abnormality, and the compressor lubricating oil between the refrigerating cycles is unevenly distributed, resulting in the failure of the compressor. There is an effect such as removal.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of a refrigeration cycle according to an embodiment of the present invention.

FIG. 2 is a diagram showing a refrigeration cycle configuration of normal wiring and normal piping according to the embodiment.

FIG. 3 is a view showing a refrigeration cycle configuration of normal wiring and a wrong gas pipe in the same embodiment.

FIG. 4 is a view showing a refrigeration cycle configuration of normal wiring and liquid pipe incorrect piping according to the embodiment.

FIG. 5 is a view showing a refrigeration cycle configuration of normal wiring and wrong gas pipe and wrong liquid pipe in the embodiment.

FIG. 6 is a diagram showing a refrigeration cycle configuration of incorrect wiring and normal piping in the embodiment.

FIG. 7 is a diagram showing a refrigeration cycle configuration of miswiring and gas pipe mispiped in the embodiment.

FIG. 8 is a view showing a refrigeration cycle configuration of miswiring and liquid pipe incorrect piping in the embodiment.

FIG. 9 is a view showing the miswiring and the refrigeration cycle configuration of the wrong gas pipe and wrong liquid pipe in the embodiment.

FIG. 10 is a diagram showing a configuration of a control circuit of the embodiment.

FIG. 11 is a flowchart for explaining the operation of the embodiment.

[Explanation of symbols]

4, 5 ... Compressor, 8, 9 ... Outdoor heat exchanger, 1 ... Outdoor unit, 28, 29 ... Indoor heat exchanger, 2, 3 ... Indoor unit, 42, 43 ... Pressure sensor, 44, 45 ... Temperature sensor .

Claims (3)

[Claims] 1. An outdoor unit is provided with a plurality of compressors and a plurality of outdoor heat exchangers, and a plurality of indoor units is provided with indoor heat exchangers, respectively, and the compressor and the outdoor heat exchanger are provided. In an air conditioner having a plurality of refrigeration cycles connected to the indoor heat exchanger, a pressure sensor provided in each suction pipe of each compressor, and a temperature sensor provided in each indoor heat exchanger, A means for monitoring the detection results of each pressure sensor and a temperature sensor and determining whether or not the pipe connection and signal line connection between the outdoor unit and each indoor unit between the refrigeration cycles are normal, and a display means for notifying the determination result. An air conditioner characterized by being equipped. 2. One outdoor unit is provided with a plurality of compressors and a plurality of outdoor heat exchangers, and each of the plurality of indoor units is provided with an indoor heat exchanger, and the compressor and the outdoor heat exchanger are provided. In an air conditioner equipped with a plurality of refrigeration cycles by connecting an indoor heat exchanger and a means for setting a check mode in which one refrigeration cycle is operated and the other refrigeration cycle is stopped, When setting the mode, a means for detecting the suction pressure of each compressor and the temperature of each indoor heat exchanger, and monitoring the detection results of each pressure sensor and temperature sensor, and piping between the outdoor unit and the refrigeration cycle of each indoor unit. A means for determining the normality of connection and signal line connection, erroneous piping in normal wiring, and the content of erroneous piping in erroneous wiring, and reporting the results of these determinations by content. An air conditioner characterized by comprising display means. 3. An outdoor unit is provided with a plurality of compressors and a plurality of outdoor heat exchangers, and a plurality of indoor units is provided with indoor heat exchangers, respectively, and the compressor and the outdoor heat exchanger are provided. And an indoor heat exchanger are connected, and in an air conditioner having a plurality of refrigeration cycles, the suction pressure Pa of each compressor is set to a stopped state of each refrigeration cycle.
0, Pbo, and means for detecting the temperatures Ta0, Tb0 of each indoor heat exchanger and storing them as data sampling, and means for setting a check mode for operating one refrigeration cycle and stopping the other refrigeration cycle When the check mode is set, the suction pressure Pb of the compressor in the stop side refrigeration cycle is detected, and the stored suction pressure Pb0 is detected.
And a means for comparing Pb <Pbo is No, a means for comparing Pb> Pb0, and a means for comparing Pb> Pb0 is No, the temperature Tb of the indoor heat exchanger in the stop side refrigeration cycle is detected and stored. Means for comparing with Tb0, means for judging normal wiring and normal piping when Tb <Tb0 is No (FIG. 2), and means for displaying the contents, and normal wiring when Tb <Tb0 is Yes , A means for judging that the gas pipe is erroneous pipe and the liquid pipe is erroneous pipe (... FIG. 5)
A means for displaying the contents, a means for comparing Tb and Tb0 when the above Pb> Pb0 is Yes, and a case where Tb <Tb0 is No, it is determined that the gas pipe is erroneous piping by the normal wiring (... FIG. 3). Means and means for displaying the contents thereof; When Tb <Tb0 is Yes, means for judging that the liquid pipe is erroneous piping with normal wiring (FIG. 4), means for displaying the contents, and Pb <Pb0 Is Yes, means for comparing Tb and Tb0, and means, when Tb <Tbo is Yes, means for detecting the suction pressure Pa of the compressor in the driving side refrigeration cycle and comparing it with the stored temperature Pa0; Pa> Pa0 When No, it is judged that the piping is normal due to miswiring (Fig. 6), and the means for displaying the contents, and when Pa> Pa0 is Yes, it is judged as mispiped due to miswiring (... Fig. 7) means and means for displaying the contents, When Tb <Tb0 is No, the means for comparing Pa and Pa0, and when Pa> Pa0 is Yes, means for judging that the liquid pipe is erroneous pipe due to miswiring (Fig. 8) and its contents are displayed. Means, when Pa> Pa0 is No, means for erroneously wiring to determine that the gas pipe is erroneous pipe and the liquid pipe is erroneous pipe (FIG. 9), and a means for displaying the contents. Air conditioner.