JPH0765793B2 - Multi-type air conditioner - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a multi-type air conditioner configured by connecting a plurality of indoor units to one outdoor unit.

(Prior Art) As a conventional example of the above-mentioned multi-type air conditioner, for example, an apparatus described in JP-A-62-134436 can be cited. The device connects a discharge pipe and a suction pipe of a compressor installed in an outdoor unit to a four-way switching valve, and further connects an outdoor heat exchanger and a liquid pipe to one connection port of the four-way switching valve in sequence. Gas pipes were respectively connected to the other connection ports, and the ends of the gas pipes were connected to four gas branch pipes, and the ends of the liquid pipes were connected to the electric expansion valve.
A configuration in which each of the indoor heat exchangers, which are respectively installed in the four indoor units, is connected in parallel to each other by branching into the liquid branch pipes and between the gas branch pipe and the liquid branch pipe. Has been done. Transmission lines for transmitting various signals are respectively connected between the outdoor unit and the indoor units.

(Problems to be solved by the invention) By the way, the connection between the outdoor unit and each indoor unit is performed by laying connection pipes at the installation site. At this time, the gas branch pipe and the liquid branch pipe are connected. When a plurality of piping connection ports on the outdoor unit side, which are formed by a pair of and, are erroneously connected to each indoor unit, there is a problem that a great deal of labor is required for the confirmation work. Since the gas side and the liquid side have different pipe diameters, there is no risk of confusion between them, but since the gas side and the liquid side use connecting pipes with the same pipe diameter, the outdoor unit On the side, it is not possible to sufficiently confirm from which indoor unit the connecting pipe is connected. Therefore, as shown in FIG. 8, for example, each gas side port 52 to 54 and each liquid side port of the outdoor unit 51 are 55 ~
Each of the indoor units 6 arranged in the room A, the room B, and the room C in the three sets of connection ports 58, 59, and 60, which are each pair with 57.
When connecting the indoor heat exchangers 64, 65, 66 of 1, 62, 63,
According to the installation work specifications, as shown by the broken line in the figure, the indoor heat exchanger 64 of the room A, the second connection port 59 are connected to the first connection port 58.
Although the room heat exchanger 65 of the room B is connected to the room B and the room heat exchanger 66 of the room C is connected to the third connection port 60, for example, as shown by the solid line in the figure, room A The indoor heat exchanger 64 causes erroneous piping such as being connected to the gas side port 53 of the second connection port 59 and the liquid side port 57 of the third connection port 60. Similarly, an erroneous connection also occurs with the transmission line.

In such an erroneous piping and erroneous connection state, for example, when only the operation switch of the indoor unit 61 of the room A is turned ON to start the cooling test operation, the outdoor unit side has the first connection port 58.
Although the operation is performed by opening the electric expansion valve provided in the liquid branch pipe leading to the room, since the refrigerant that has passed through the electric expansion valve is not supplied to the indoor unit 61, the cold air in the room A Is not obtained, and it is detected that erroneous piping is occurring.In this case, check the indoor heat exchanger in the other room that causes a temperature drop and check the connection state of the liquid side communication piping. Will be required. Further, even after the liquid side communication pipe is corrected to the normal connection state, the opening degree of the electric expansion valve described above is based on the refrigerant temperature after evaporation detected in the gas branch pipe communicating with the first connection port on the outdoor unit side. The control (superheat control) is performed. At this time, since the refrigerant from the chamber A is not circulated in the gas branch pipe, the superheat control is not normally performed. Abnormality will occur. As a result, it is necessary to further investigate which gas branch pipe is causing the temperature drop and correct the gas side connecting pipe.
It takes a considerable amount of time and a large number of people to perform the confirmation work to check the correspondence between the operating conditions of the outdoor side and the indoor side while sequentially performing the trial operation for each room. ing.

The present invention has been made in view of the above, and an object thereof is to provide a multi-type air conditioner that can eliminate the need for checking work for erroneous piping and erroneous connection as described above.

(Means for Solving the Problems) Therefore, as shown in FIG. 1, a multi-type air conditioner according to the present invention has a compressor 1 and an outdoor connected to one of a discharge side and a suction side of the compressor 1. A heat exchanger 7 and a liquid pipe 11 having one end connected to the outdoor heat exchanger 7 are provided at the other end thereof with a plurality of liquid branch pipes 17 each having an opening / closing valve 23 interposed therebetween.
1 to 17-4, and the other end of the gas pipe 6 whose one end is connected to the other of the discharge side and the suction side of the compressor 1 is branched into a plurality of gas branch pipes 19-1 to 19-4. The liquid branch pipes 17-1 to 17-4 and the gas branch pipe 19-1 to 1 of the outdoor unit X
19-4 is a multi-type air conditioner in which the indoor heat exchangers 22 of the plurality of indoor units A to D are respectively connected, and the refrigerant discharged from the compressor 1 is exchanged with the outdoor heat exchanger. Each indoor heat exchanger 22 and each gas branch pipe 19-1 to 19-during a refrigerant circulation cycle in which the refrigerant is circulated to the heat exchanger 7 and the indoor heat exchanger 22.
Heat exchanger temperature detecting means for detecting temperature changes of 4 respectively
31 and the gas branch pipe temperature detection means 32, based on the detection signal of each of the temperature detection means 31, 32 in the refrigerant operation cycle during the trial operation performed by opening any one of the on-off valves 23 A signal processing means 45 for determining which indoor unit A to D the liquid branch pipes 17-1 to 17-4 and the gas branch pipes 19-1 to 19-4 are connected to is provided, and the signal processing means at the time of the test operation is provided. The storage means 46 for storing the determination result of 45 is provided, and the operation control means 47 for the normal operation is provided by the data of the storage means 46.

(Operation) In the above multi-type air conditioner, each liquid branch pipe 17-1
-17-4 are provided to open any one of the open / close valves 23 to cool the refrigerant discharged from the compressor 1, for example, from the outdoor heat exchanger 7 side to the indoor heat exchanger 22. When performing a trial operation in the refrigerant circulation cycle at the time, it is connected to the indoor heat exchanger 22 and the indoor heat exchanger 22 connected to the liquid branch pipe in which the open / close valve 23 is opened. Refrigerant circulates through the gas branch pipes, and therefore, only the indoor heat exchanger 22 and the gas branch pipes through which the refrigerant flows decrease in temperature (in the case of a circulation cycle during heating, a temperature rises). Indoor heat exchangers that change 22
And the gas branch pipes are detected by the temperature detecting means 31 and 32, and the liquid processing pipes 17-1 are detected by the signal processing means 45 based on the detected signals.
17-4 and gas branch pipes 19-1 to 19-4 are connected to which indoor units A to D, and the result of this judgment is stored in the storage means 46.

On the other hand, during normal operation, the operation control means 47 controls the outdoor unit X on the basis of the data stored in the storage means 46 obtained during the trial operation. Therefore, normal normal operation can be performed without performing confirmation work for incorrect piping and incorrect connection.

(Example) Next, a specific example of the multi-type air conditioner of the present invention will be described in detail with reference to the drawings.

FIG. 2 shows a refrigerant circuit diagram of a multi-type air conditioner configured by connecting one outdoor unit X to first to fourth indoor units A to D. A compressor 1 is installed in the outdoor unit X, and a discharge pipe 2 and a suction pipe 3 of the compressor 1 are connected to a four-way switching valve 4, and the four-way switching valve 4 is further connected to a first gas. The pipe 5 and the second gas pipe 6 are connected. An outdoor heat exchanger 7 is provided in the first gas pipe 5.
Is connected to the outdoor heat exchanger 7, and a liquid pipe 11 in which a first electric expansion valve 8, a liquid receiver 9 and a liquid closing valve 10 are sequentially provided in the outdoor heat exchanger 7.
Are further connected. The compressor 1 has an inverter 12 for controlling its rotation speed. An accumulator 13 is provided in the suction pipe 3 and a gas shutoff valve 14 is provided in the second gas pipe 6, while an outdoor fan 15 is attached to the outdoor heat exchanger 7.

The tip of the liquid pipe 11 has first to fourth liquid side pipe connection ports.
16-1 to 16-4 are branched into first to fourth liquid branch pipes 17-1 to 17-4, respectively, and the tip of the second gas pipe 6 is connected to the first to fourth gas sides. Piping connection port 18-1 to 18
First to fourth gas branch pipes 19-1 respectively connected to
It is branched to 19-4. And the liquid side pipe connection ports 16-1 to 16-4 and the gas side pipe connection ports 18-1 to 18-1
The indoor heat exchangers (first to fourth indoor units A to D) respectively connected to the 18-4 with the liquid side connecting pipes 20 ... 20 and the gas side connecting pipes 21. 1
22 are shown connected to each other in parallel. A second electric expansion valve (open / close valve) 23 ... 23 is provided in each of the liquid branch pipes 17-1 to 17-4. Each of the indoor units A to D is composed of the indoor heat exchanger 22 and the indoor fan 24.

In the cooling operation in the air conditioner having the above configuration, the four-way switching valve 4 is positioned at the switching position shown by the solid line in the figure, and the refrigerant discharged from the compressor 1 is transferred from the outdoor heat exchanger 7 serving as a condenser to the evaporator. It is carried out by circulating the heat to each indoor heat exchanger 22 ,. At this time, the first electric expansion valve 8 is fully opened, and the superheat degree of the refrigerant is controlled by each of the second electric expansion valves 23. The second electric expansion valve 23 corresponding to the indoor unit in the cooling stop room is fully closed. In order to control the degree of superheat during the cooling operation, the heat exchanger temperature sensor (heat exchanger temperature detecting means) 31 including a thermistor or the like for detecting the temperature of each indoor heat exchanger 22 as the refrigerant evaporation temperature Each gas branch pipe 19 has a gas branch pipe temperature sensor (gas branch pipe temperature detecting means) 32 that is attached to the exchangers 22 ... 22 and detects the temperature of the gas branch pipes 19-1 to 19-4 as the superheated temperature of the evaporating refrigerant. It is attached to -1 to 19-4. Further, each of the indoor units A to D is further provided with a room temperature sensor 33 for detecting the indoor temperature.

On the other hand, in the heating operation, the four-way switching valve 4 is switched to the switching position shown by the broken line in the drawing, and the refrigerant discharged from the compressor 1 is transferred from the indoor heat exchanger 22 serving as a condenser to the outdoor heat exchanger 7 serving as an evaporator. It is carried out by diversion. In this case, the first electric expansion valve 8 controls the degree of superheat of the evaporated refrigerant. The second electric expansion valves 23 ... 23 control the amount of refrigerant distributed to the indoor heat exchangers 22 so that the condensed refrigerant temperature at the outlets of the indoor heat exchangers 22 becomes the same temperature. Each of the above-mentioned second electric expansion valves 23
.. Performed by controlling the opening of 23. In addition, the second electric expansion valve 23 corresponding to the indoor unit of the stop room has a predetermined stop opening degree (an opening degree capable of flowing a slight amount of refrigerant commensurate with natural heat dissipation in order to prevent liquid return to the compressor 1). ). In order to perform the superheat control during the heating operation, an outdoor heat exchanger temperature sensor 34 for detecting the temperature of the outdoor heat exchanger 7 as a refrigerant evaporation temperature is attached to the outdoor heat exchanger 7, A suction pipe temperature sensor 35 for detecting the overheat temperature of the evaporated refrigerant is attached to the suction pipe 3. Further, in order to detect the temperature of the condensed refrigerant at the outlet of each indoor heat exchanger 22, the liquid branch pipe temperature sensors 36, ...
It is attached to -4.

Further, in the above apparatus, in the trial run at the end of the installation work, even if the connecting pipes 20 and 21 for connecting the outdoor unit X and the indoor units A to D are connected in any connection state, the outdoor unit X side during the trial run. In FIG. 3, there is provided an operation control function of performing an operation according to the connection order of the connecting pipes 20 and 21, and a control block diagram thereof is shown in FIG. In addition,
Details of the operation control function will be described in detail with reference to control flowcharts of FIGS. 5 to 7 described later. In FIG. 3, reference numeral 41 denotes an outdoor control device provided in the outdoor unit X, and a microcomputer or the like can be used as the outdoor control device. In this outdoor control device 41, as shown in FIG. 1, when the operation switch is turned ON by the user on each of the indoor units A to D, the above-described cooling operation or heating operation is controlled in a steady state. The operation control means 47 for operation is provided, and the operation control unit at the time of test operation for performing a test operation in an arbitrary pipe connection state
42 and signal processing means 45 for determining an arbitrary pipe connection state at the time of test operation are provided. The signal processing means 45 includes heat exchanger temperature sensors 31 ... 31 and room temperature sensors 33.
.33 and the temperature detected by each gas branch pipe temperature sensor 32..32 are input, and the determination result by the signal processing means 45 is stored in the storage means 46. There is. On the other hand, during a normal steady operation, the data in the storage means 46 is output to the operation control means 47, and the operation control means 47 operates the compressor 1, switches the four-way switching valve 4, and First and second electric expansion valves 8, 23
..23 opening / closing control is performed.

In FIG. 4 showing a state in which the pipe connecting step capable of starting the test operation is completed, the 18th to 4th liquid side pipe ports are shown.
16-1 to 16-4 and gas side piping connection port 18-1 to 1-
4 are arranged in pairs in the first to fourth groups 48-1 to 48-4, and the transmission lines 44 of the indoor units A to D are connected to the groups 48-1 to 48-4, respectively. Connector 49-1
~ 49-4 are provided. And the communication pipe 20,
21 and the transmission line 44 are connected to the above ports and connectors in any order. Further, the indoor heat exchanger temperature sensors 31, ... 31 of the indoor units A to D are sequentially connected to DCn (n = 1 to 1).
The number of 4) is given, and the gas branch pipe temperature sensor 32 ・
・ DGn (n = 1 to 4) is sequentially assigned to 32.

Further, the outdoor control device 41 can be switched between a trial operation mode for checking the connection state of piping and wiring and a normal operation mode for normal operation. The switching control of both modes will be described with reference to FIG. In FIG. 5, first, in step S1, it is determined whether or not the operation is switched to the trial operation mode. If it is the trial operation mode, the process proceeds to step S2. If it is not the trial operation mode, the normal operation control step S3 is performed.
Go to. When it is determined that the operation mode is the trial operation mode, the process proceeds from step S2 to step S4, and the connection state of the piping and wiring shown in FIG. 4 is stored in step S4. Next, in step S5, it is determined whether or not the storage process is completed. If it is completed, the process proceeds to step S3 of the normal operation control, and if it is not completed, the process returns to step S2.

During the trial operation, the trial operation operation control unit 42 first turns off the four-way switching valve 4 to bring it to the switching position during the cooling operation described above, and fully opens the first electric expansion valve 8. Next, for example, the outdoor unit X among the four second electric expansion valves 23 is controlled by the operation control unit during trial operation 42.
Connection port 16-1 of group 48-1 assumed to be for room A in
The second electric expansion valve 23 communicating with the second electric expansion valve 23 is opened, and the other second electric expansion valves 23 are kept fully closed. Then, the operation of the compressor 1 is started at a predetermined inverter frequency. As a result, the operation in a cooling cycle in which the refrigerant discharged from the compressor 1 during the test operation circulates from the outdoor heat exchanger 7 side to the indoor heat exchanger 22 is started. This second electric expansion valve 23..23
In the open / closed state, the refrigerant flows from the liquid branch pipe 17-1 only to the liquid side pipe connection port 16-1 of the group 48-1 which is assumed to be for the room A on the outdoor unit X side in FIG. Then, in step S10 of FIG. 6 showing the details of the pipe wiring determination processing in step S2, the connection port 16-1
It is determined whether or not the second electric expansion valves 23, ..., 23 are controlled to be opened / closed by the outdoor control device 41 so that the refrigerant is allowed to flow only to the open state. If the open / close state is set, the process proceeds to the next step S11. In step S10, the group 48-1 assumed to be used for room A
The operating state of the outdoor unit X in which the refrigerant flows through the liquid branch pipe 17-1 is described as “A room operation”.

By the way, in the cooling cycle in which the second electric expansion valves 23 ... 23 are opened and closed as described above, the outdoor heat exchanger 7 shown in FIG.
The high-temperature high-pressure liquid refrigerant condensed in 1. becomes low-temperature low-pressure liquid refrigerant when passing through the opened second electric expansion valve 23, and is connected to the first liquid branch pipe 17-1 via the liquid-side communication pipe 20. It flows into the indoor heat exchanger 22 and evaporates. As a result, the indoor heat exchanger 22 changes to a low temperature state. Then, the evaporative refrigerant is supplied from the indoor heat exchanger 22 to the gas side communication pipe.
It is returned to the compressor 1 via a gas branch pipe connected by 21. At this time, the gas branch pipe through which the evaporated refrigerant passes also changes to a low temperature state. Therefore, in which indoor unit the indoor heat exchanger 22 is connected to the first liquid branch pipe 17-1, and which indoor heat exchanger 22 is further connected to any of the gas branch pipes 19-1 to 19-4. Which of the indoor heat exchangers 22 and the gas branch pipes 19-1 to 19-4 causes a temperature decrease during the cooling cycle operation is sequentially determined by the both temperature detecting means 3
It is possible to determine which indoor unit A to D is connected to which port and connector by detecting the detected signal by 1, 32 and determining the detected signal by the signal processing means 45.

This pipe wiring determination processing will be described in the connection state of FIG. 4. When the refrigerant flows through the liquid branch pipe 17-1 of the group 48-1, the liquid side pipe connection port 16-1 of the group 48-1 is connected. Refrigerant flows through the connected liquid side communication pipe 20 to, for example, the indoor unit C for room C, and the signal from the sensor 31 of the indoor unit C having the number DC3 is transmitted by the transmission line 44 to the connection connector 49-of the group 48-4. 4 is input to the outdoor control device 41 of the outdoor unit X. At the same time, the refrigerant expanded in a gaseous state through the gas side communication pipe 21 of the indoor unit C returns to the outdoor unit X through the gas side pipe connecting port 18-2 of the group 48-2. At this time, the gas branch pipe temperature sensor 32 with the number DG2 becomes the lowest temperature.

In the first stage of the trial operation as described above, the above steps
In S11, the number DGn of the coldest sensor 32 in each gas branch pipe temperature sensor 32 ... 32 is detected. For example, in the connection state of FIG. 4, the sensor 32 with the number DG2 has the lowest temperature, and its detection signal is input to the outdoor control device 41. Next step
In S12, the gas side pipe connection port 18-2 corresponding to the detected number DG2 is determined to be for the indoor unit C. That is, in step S12, it is determined that the refrigerant sent from the group 48-1 of the outdoor unit X, which is assumed to be for room A, returns to the connection port 18-2 via the indoor unit C, and Is described in step S12 as "the No. DGn is for room A".

Then, in step S13, each heat exchanger temperature sensor 31.
・ Detect the number DCn of the coldest sensor 31 out of 31.
For example, in the connection state of FIG. 4, the sensor 31 with the number DC3 is detected. That is, on the indoor unit X side, the refrigerant flowing out from the connection port 16-1 of the group 48-1 supposed to be for room A flows into the indoor unit C, and the detection signal from the sensor 31 of this number DC3 is transmitted by the transmission line 44. Therefore, in step S14, the outdoor control device 41 puts the connection connector 49-4 of the indoor unit C into the connection connector 49-4 having the lowest detected temperature. Sensor
Detects that the signal from 31 is input. In addition, in step S14, it is said that "No.
It is for room use. "

As a result, the outdoor control device 41 is connected to the connection port of the group 48-1.
16-1 and the connection port 18-2 of the group 48-2 and the connection connector 49-4 of the group 48-4 are controlled as one set, and these connection ports 16-1, 18-2 and the connection connector 49- In step 4, the state in which the indoor unit C is operation-controlled can be confirmed.

When the outdoor unit X is not operated so that the refrigerant flows through the connection port 16-1 of the group 48-1 in step S10, the process proceeds from step S10 to step S15. At this time, from the liquid branch pipe 17-2 of the group 48-2, which is assumed to be for room B, on the side of the outdoor unit X to be next determined, to the connection port.
The opening / closing control of the four second electric expansion valves 23, ..., 23 is performed so that the refrigerant flows only to 16-2, and steps S11 to S in FIG. 6 are performed.
The same determination process as 14 is performed. Therefore, each group 48-2 to 48
-4 by sequentially repeating the above determination processing, the remaining connection ports 16-2 to 48-4 of each group 48-2 to 48-4
Which indoor unit A, B or D the refrigerant flowing from 16-4
Connection port 18 of which group 48-1, 48-3, 48-4
-1 or 18-3, 18-4 is returned to the outdoor unit X, and signals from each transmission line 44 are connected to any of the connectors 49-1 to 49-3.
Is input to each group of outdoor unit X 48-
The determination of 2 to 48-4 is performed in the same manner as above. This is described in step S15 as "determining each room in the same manner as room A".

After performing the above-described test operation, as shown in step S20 of FIG. 7, the data obtained by the determination process of all the groups 48-1 to 48-4 is stored in the storage means 46 (FIG. 1). When the normal operation mode is switched to the normal operation mode, it is determined in step S1 in FIG. 5 that the operation mode is not the trial operation mode, the process proceeds from step S1 to step S3, and the operation control means 47 stores the data stored in the storage means 46. Based on this, normal operation control is performed. Therefore, the second electric expansion valves 23, ... 23 of the outdoor unit X can be handled in accordance with the arbitrarily connected connection state without performing the laborious work of confirming the connection state of the piping and wiring as in the conventional case.
And the like are controlled so as to flow a predetermined refrigerant into each group 48-1 to 48-4, which eliminates the need for troublesome piping and wiring connection work.

In the above description, a multi-type air conditioner that connects four indoor units A to D has been described as an example, but the present invention is also applied to a multi-type air conditioner configured by other connected numbers. be able to. Further, in the above, the trial operation is performed in the cooling circulation cycle, but in some cases, it is also possible to detect the temperature rise change of the indoor heat exchanger and the gas branch pipe as the heating circulation cycle.

(Effects of the Invention) As described above, in the multi-type air conditioner of the present invention, the indoor heat exchanger and the gas branch pipe that cause a temperature change at the time of test operation are detected by the both temperature detecting means, and a signal is output based on this detection signal. The processing means can determine which indoor unit each liquid branch pipe and gas branch pipe is connected to, and the determination result can be stored in the storage means.

On the other hand, at the time of normal operation, the operation control means can control the operation of the outdoor unit based on the data stored in the storage means obtained at the time of the trial operation described above, and it is possible to perform confirmation work for incorrect piping and incorrect connection. Also enables normal normal operation.

[Brief description of drawings]

FIG. 1 is a functional block diagram of the present invention, and FIG. 2 is a refrigerant circuit diagram of a multi-type air conditioner according to an embodiment of the present invention.
FIG. 3 is an operation control block diagram of the air conditioner at the time of test operation, FIG. 4 is a structural schematic diagram showing a connection state at the time of test operation, FIG. 5 is a control flowchart in the control device, and FIG. Process control flow chart,
FIG. 7 is a control flowchart of the storage process, and FIG. 8 is a schematic diagram showing an example of erroneous piping between the outdoor unit and the indoor unit. 1 ... Compressor, 6 ... Second gas pipe, 7 ... Outdoor heat exchanger, 11 ... Liquid pipe, 17-1 to 17-4 ... Liquid branch pipe, 19-1 to
19-4 …… Gas branch pipe, 22 …… Indoor heat exchanger, 23 …… Second
Electric expansion valve (open / close valve), 31 ... Heat exchanger temperature sensor (heat exchanger temperature detecting means), 32 ... Gas branch pipe temperature sensor (gas branch pipe temperature detecting means), 45 ... Signal processing means, 46 ... Storage means, 47 ... Operation control means, X ... Outdoor unit, A
~ D …… Indoor unit.

Claims (1)

[Claims] 1. A compressor (1) and an outdoor heat exchanger (7) connected to one of a discharge side and a suction side of the compressor (1), and the outdoor heat exchanger (7). ), The other end of the liquid pipe (11) is connected to a plurality of liquid branch pipes (17-1 to 17-4) each having an opening / closing valve (23), and the compressor (1). The other end of the gas pipe (6) whose one end is connected to the other of the discharge side or the suction side of the plurality of gas branch pipes (19-1 to 19-1
19-4) and the liquid branch pipes (17-1 to 17-4) and the gas branch pipe (19) of the outdoor unit (X) respectively branched and configured.
-1 to 19-4), a plurality of indoor units (A to
A multi-type air conditioner in which each indoor heat exchanger (22) of D) is connected, wherein the refrigerant discharged from the compressor (1) is transferred to the outdoor heat exchanger (7) and the indoor heat exchanger. (twenty two)
Heat exchanger temperature detecting means (31) and gas branch pipe for detecting temperature changes of the indoor heat exchanger (22) and the gas branch pipes (19-1 to 19-4) during the refrigerant circulation cycle of circulating the gas to the The temperature detecting means (32) is provided, and at the same time, the temperature detecting means (31), (3) in the refrigerant operation cycle at the time of trial operation performed by opening any one of the on-off valves (23).
Based on the detection signal of 2), each of the above liquid branch pipes (17-1 to 17-
4) and a signal processing means (45) for determining which indoor unit (A to D) the gas branch pipes (19-1 to 19-4) are connected to, and a signal processing means (45) at the time of the test operation. A multi-type air conditioner characterized in that a storage means (46) for storing the determination result of (1) is provided, and an operation control means (47) that normally operates according to the data of the storage means (46) is provided.