JPH07139784A - Air conditioner - Google Patents

Abstract

PURPOSE:To perform a suitable drive by comparing detected number and detected capacities of indoor units connected to outdoor units with predetermined set number an set capacity, and detecting erroneous connections of a plurality of the outdoor units to the one indoor unit. CONSTITUTION:The number and capacities of indoor units B1-B6 connected to outdoor units A1, A2 are detected by communication through a bus communication channel C, the detected number and the detected capacity are compared with preset number and set capacity to detect presence of absence of a connecting malfunction. An erroneous connection of the units A1, A2 to one of the units A1-B6 is detected by the communication through the channel C. Thus, whether or not the connections of the units A1, A2 to the units B1-B6 are correct can be rapidly and effectively detected, the operating efficiency at the time of installing is improved, and a suitable drive can be executed.

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 a plurality of outdoor units, each of which has a plurality of indoor units connected by pipes and signal lines.

[0002]

2. Description of the Related Art There is a multi-type air conditioner in which a plurality of indoor units are connected to one outdoor unit. By using this air conditioner, a large number of rooms such as buildings can be air-conditioned at one time.

In this air conditioner, a compressor and an outdoor heat exchanger are provided in an outdoor unit, an indoor heat exchanger is provided in each indoor unit, and a compressor, an outdoor heat exchanger, and each indoor heat exchanger are connected to a refrigerant pipe. The refrigeration cycle is connected to each other to configure a refrigeration cycle, and each unit is connected to a signal line to construct an operation control system.

Recently, a large-scale air conditioning system in which a plurality of indoor units are connected to a single outdoor unit to form a single refrigeration cycle unit and a plurality of such refrigeration cycle units are provided has been introduced.

[0005]

The piping connection and the signal line connection between the outdoor unit and each indoor unit are manually performed by a worker at the time of installation in a building, but careless because of the large number of connections. , There is a concern that the pipe connection and signal line connection may be incorrect. If such an erroneous connection occurs, it is naturally difficult to operate properly.

Therefore, after installation, it is necessary to check whether or not the connection state of each part is correct one by one. However, this inspection work is troublesome for the operator, and the work takes a long time. In particular, when the number of outdoor units and indoor units is large, such as a large model having a plurality of refrigeration cycle units, the inspection is often omitted, and erroneous connection may be overlooked.

The present invention takes the above circumstances into consideration,
The purpose is to be able to quickly and surely check whether the connection between the outdoor unit and each indoor unit is correct, even if the number of units is large, without burdening the workers. (EN) It is intended to provide an air conditioner capable of improving work efficiency during installation and capable of proper operation.

[0008]

An air conditioner according to a first aspect of the present invention is an operation unit for setting the number and capacity of indoor units to be connected to each outdoor unit, and an indoor unit connected to each outdoor unit. A detecting means for detecting the number and capacity of units by communication through a bus communication line, a determining means for comparing the detected number and capacity with the set number and set capacity to determine whether there is a connection abnormality, and a plurality of units. A detection means for detecting an erroneous connection between the outdoor unit and one indoor unit by communication through a bus communication line is provided.

In the air conditioner of the second aspect of the present invention, operating means for setting the number and capacity of the indoor units to be connected to each outdoor unit and the capacity data of the indoor unit provided in each indoor unit are signaled. A means for transmitting to the outdoor unit of the connection destination by a line, and provided in each outdoor unit,
Connection is made by means of detecting the number and capacity of indoor units connected to the outdoor unit, which are provided in each outdoor unit, by a transmission signal from the indoor unit, and by comparing the detected number and capacity with the set number and set capacity. A means for determining the presence or absence of an abnormality, a means provided for each indoor unit, for determining whether there is a connection abnormality when receiving signals from a plurality of outdoor units, and each of the outdoor units when the above determination results indicate no connection abnormality. It is provided with means for sequentially operating one by one, means for detecting a change in the state of each indoor unit during operation of each outdoor unit, and means for determining the presence or absence of a connection abnormality according to the detection result.

The air conditioner of the third invention is, in addition to the configuration of the first or second invention, a plurality of remote control type operating devices connected to each indoor unit and a centralized unit commonly connected to each outdoor unit. One remote control type operation device for control and a means for displaying each judgment result provided in these operation devices are provided.

[0011]

In the air conditioner of the first invention, the number and capacity of indoor units connected to each outdoor unit are detected by communication through the bus communication line, and the number of detected units and the detected capacity and the preset number of units are set. And the set capacity are compared to determine whether there is a connection abnormality. An erroneous connection between a plurality of outdoor units and one indoor unit is detected by communication through a bus communication line.

In the air conditioner of the second invention, the connection abnormality is detected by detecting the number and capacity of the connected indoor units in each outdoor unit and comparing the detected number and capacity with a preset number and set capacity. The presence or absence of is determined. When signals are input from a plurality of outdoor units in each indoor unit, it is determined that there is a connection abnormality. When all the judgment results indicate that there is no connection abnormality, each outdoor unit is operated one by one. The state change of each indoor unit is detected during operation of each outdoor unit, and the presence or absence of connection abnormality is determined according to the detection result.

In the air conditioner of the third aspect of the invention, in addition to the operation of the first or second aspect of the invention, a plurality of remote control type operation devices that connect the respective determination results to the respective indoor units,
Also, it is displayed by one remote control type operation unit for centralized control commonly connected to each outdoor unit.

[0014]

DETAILED 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, two outdoor units A ₁ and A ₂ are prepared. Of these, the outdoor unit A
_{The first} refrigeration cycle unit is configured by connecting _three indoor units B ₁ , B ₂ , and B ₃ to 1 by refrigerant piping. Also,
The outdoor unit A ₂ has three indoor units B ₄ , B ₅ , and B
₆ is connected to the refrigerant pipe to form a second refrigeration cycle unit.

The outdoor unit A ₁ includes the compressors 1 and 2 housed in a common closed case. The compressor 1 is an inverter-driven variable capacity compressor. The compressor 2 is a commercial power source driven fixed capacity compressor.

The high pressure side pipe 4a is connected to the discharge port of the compressor 1. The high pressure side pipe 4b is connected to the discharge port of the compressor 2, and the check valve 3 is provided on the high pressure side pipe 4b. The high pressure side pipe 4 a and the high pressure side pipe 4 b are connected to the high pressure side pipe 4. The low-pressure side pipe 5 is connected to the suction ports of the compressors 1 and 2.

An outdoor heat exchanger 8 is connected to the high-pressure side pipe 4 via an oil separator 6 and a four-way valve 7. A dryer 11 is pipe-connected to the outdoor heat exchanger 8 via a check valve 9 and a liquid tank 10. An expansion valve 12 for heating is connected in parallel to the check valve 9 by piping. An outdoor fan 13 is provided near the outdoor heat exchanger 8.

A strainer 15 is connected to the low-pressure side pipe 5 via an accumulator 14 and a four-way valve 7. The oil separator 6 extracts the lubricating oil contained in the refrigerant discharged from the compressors 1 and 2. A pipe 16 for returning oil is connected from the oil separator 6 to the low-pressure side pipe 5.

One end of the cooling bypass 17 is connected to the liquid side pipe between the check valve 9 and the liquid tank 10.
The other end of the cooling bypass 17 is connected to the low pressure side pipe between the four-way valve 7 and the accumulator 14. Then, the cooling bypass 17 is provided with the flow rate adjusting valve 18.

A high pressure switch 21 and a refrigerant temperature sensor 25 are attached to the high pressure side pipe 4a. In the high pressure side pipe 4b,
The high pressure switch 22 and the refrigerant temperature sensor 26 are attached. The high pressure switches 21 and 22 are activated when the pressure of the refrigerant rises abnormally and reaches a predetermined value.

A refrigerant pressure sensor 23 is attached to the high pressure side pipe 4, and a refrigerant pressure sensor 24 and a refrigerant temperature sensor 27 are attached to the low pressure side pipe 5. The heat exchanger temperature sensor 28 is attached to the outdoor heat exchanger 8. An outdoor air temperature sensor 29 is attached to a predetermined location of the outdoor unit A ₁ .

The other outdoor unit A ₂ has the same structure. An indoor heat exchanger 33 is connected between the dryer 11 and the strainer 15 through a strainer 31 of the indoor unit B ₁ and a flow rate adjusting valve 32 by piping. An indoor fan 34 is provided near the indoor heat exchanger 33. Then, the refrigerant pressure sensor 35 and the refrigerant temperature sensor 37 are attached to the liquid side pipe between the PMV 32 and the indoor heat exchanger 33. A refrigerant pressure sensor 36 and a refrigerant temperature sensor 38 are attached to the gas side pipe connected to the indoor heat exchanger 33. An indoor temperature sensor 39 is provided in the passage of the intake air of the indoor fan 34.

Other indoor units B ₂ , B ₃ , B ₄ , B
₅ and B ₆ also have the same configuration and the same refrigerant pipe connection. That is, at the time of cooling, the four-way valve 7 is set to the neutral state, whereby the refrigerant discharged from the compressors 1 and 2 is caused to flow in the direction of the solid line arrow in the drawing to form a cooling cycle.
The outdoor heat exchanger 8 functions as a condenser, and each indoor heat exchanger 33 functions as an evaporator. Further, during heating, the four-way valve 7 is switched, whereby the refrigerant discharged from the compressors 1 and 2 is caused to flow in the direction of the broken line arrow in the drawing to form a heating cycle, and each indoor heat exchanger 33 is connected to the condenser and the outdoor. The heat exchanger 8 functions as an evaporator.

The flow rate adjusting valve 18 and each flow rate adjusting valve 3
Reference numeral 2 is a pulse motor valve whose opening continuously changes according to the number of input drive pulses. Hereinafter, the flow rate adjusting valve is abbreviated as PMV.

Further, as shown in FIG. 2, the outdoor unit A
₁ and the indoor units B ₁ , B ₂ , B ₃ are connected by a signal line (= bus communication line) C to construct a first operation control system, and the outdoor unit A ₂ and the indoor units B ₃ , B
_A second operation control system is constructed by connecting ₄ , ₅ with a signal line C.

These operation control systems perform time division data transmission / reception between the outdoor unit and each indoor unit. That is, first, a data request command is sent from the outdoor unit A ₁ to the indoor units B ₁ , B ₂ , B ₃ , and in response to the data request command, the indoor units B ₁ , B ₂ , B ₃ are sequentially transferred to the outdoor unit A _1. Data is transferred. The same applies to data transmission / reception between the outdoor unit A ₂ and the indoor units B ₃ , B ₄ , B ₅ .

Each outdoor unit has an outdoor controller 50. The outdoor control unit 50 includes a microcomputer and its peripheral circuits. The outdoor control unit 50 includes a four-way valve 7, an outdoor fan motor 13M, a PMV 18, high pressure switches 21 and 22, refrigerant pressure sensors 23 and 24, refrigerant temperature sensors 25, 26 and 27, a heat exchanger temperature sensor 28, and an outside air temperature sensor 29. , The outdoor commercial AC power supply 51, the inverter 52, and the switch 53 are connected.

The inverter 52 is connected to the power supply 51 via the power supply line in the outdoor control unit 50, rectifies the power supply voltage, and converts it into a voltage of a predetermined frequency by switching according to a command from the outdoor control unit 50. And output. This output becomes drive power for the compressor motor 1M.

The switch 53 is, for example, a contact of an electromagnetic contactor. Switch 5 on the power supply line in the outdoor control unit 50
The compressor motor 2M is connected via 3. Then, a remote control type operating device (hereinafter, abbreviated as centralized remote controller) 54 is commonly connected to the outdoor control units 50 of the outdoor units A ₁ and B ₁ , respectively.

The centralized remote controller 54 has a display 54a and a trial run switch 54b in addition to key buttons (not shown) for setting operating conditions, and is provided in a manager room or the like in the building. Further, the centralized remote controller 54 also serves as an operating unit for setting the number Ns of indoor units and the capacity Vs to be connected to the outdoor units A ₁ and A ₂ , respectively.

The indoor controller 60 comprises a microcomputer and its peripheral circuits. In this indoor control unit 60,
The PMV 32, the indoor fan motor 34M, the refrigerant pressure sensors 35 and 36, the refrigerant temperature sensors 37 and 38, the indoor temperature sensor 39, the indoor commercial AC power supply 61, and the remote control type operation device (hereinafter abbreviated as a remote controller) 62 are connected. To do. The remote controller 62 has a display 62a in addition to a key button (not shown) for setting operating conditions.

The indoor controller 60 has the following functional means. [1] Means for transmitting to the outdoor unit A data of operating conditions set by operating the key buttons of the remote controller 62.

[2] The difference ΔT between the detected temperature (intake air temperature) Ta of the indoor temperature sensor 39 and the set temperature Ts of the remote controller 62 is obtained, and the data of the required capacity corresponding to the temperature difference ΔT is sent to the outdoor unit A. Means to send.

[3] A means for controlling the opening of the PMV 32 according to the required capacity of the indoor unit. [4] During cooling, the degree of superheat of the refrigerant in the indoor heat exchanger 33 is determined from the temperature Te ₂ detected by the refrigerant temperature sensor 38 on the outlet side of the indoor heat exchanger 33 and the pressure (evaporation pressure) Pe ₂ detected by the refrigerant pressure sensor 36. Means to detect.

[5] During heating, from the temperature Te ₁ detected by the refrigerant temperature sensor 37 on the outlet side of the indoor heat exchanger 33 and the pressure (condensation pressure) Pe ₁ detected by the refrigerant pressure sensor 35, the refrigerant in the cold indoor heat exchanger 33. Means for detecting the degree of supercooling of.

[6] Means for correcting the opening degree of the PMV 32 so that the detected superheat degree and supercooling degree have respective set values. [7] Means for displaying a character indicating that there is an abnormality on the indoor side on the display 62a of the remote controller 62 when no signal is received from the outdoor unit within a predetermined time t _{1 after the} power source 61 is turned on.

[8] A means for transmitting the data of the capacity of the indoor unit to the connected outdoor unit when the trial operation mode is notified from the outdoor unit. [9] A means for fully opening the PMV 32 when a second step start command is received from the outdoor unit in the trial operation mode.

[10] A means for detecting a state change (change in at least one of temperature and pressure of the refrigerant) when the PMV 32 is fully opened. [11] A means for notifying the outdoor unit of the detected state change.

[12] A means for detecting an erroneous connection between the indoor unit and a plurality of outdoor units by communication through a bus communication line. That is, when signals are received from a plurality of outdoor units in duplicate, it is determined that there are a plurality of connected outdoor units, it is determined that there is an abnormality on the indoor side, the outdoor unit is notified of that fact, and the display of the remote controller 62 is displayed. 62a
To display characters.

The outdoor controller 50 has the following functional means. [1] A means for controlling the operating capacity of the compressors 1 and 2 (the number of operating compressors 1 and 2 and the operating frequency F of the compressor 1) according to the total required capacity of each indoor unit B.

[2] The four-way valve 7 is set to the neutral state, and the refrigerant discharged from the compressors 1 and 2 is transferred to the four-way valve 7, the outdoor heat exchanger 8, each flow rate adjusting valve 32, each indoor heat exchanger 33, and the four-way valve. 7
Means for returning to the compressors 1 and 2 through the air conditioner to execute the cooling operation.

[3] The four-way valve 7 is switched, and the refrigerant discharged from the compressors 1 and 2 is passed through the four-way valve 7, each indoor heat exchanger 33, each flow rate adjusting valve 32, the outdoor heat exchanger 8, and the four-way valve 7. Compressor 1,
A means for returning to 2 and performing heating operation.

[4] Means for executing the defrosting operation on the outdoor heat exchanger 8 according to the temperature Te detected by the heat exchanger temperature sensor 28 during heating. [5] The detected pressure Pd of the refrigerant pressure sensor 23 abnormally rises to a set value (lower than the operating points of the high pressure switches 21 and 22).
The first high pressure protection means for reducing the capacity (operating frequency F) of the compressor 1 by a predetermined value when the temperature reaches.

[6] Second high pressure protection means for stopping the operation of the compressor 1 when the high pressure switch 21 is activated and stopping the operation of the compressor 2 when the high pressure switch 22 is activated. [7] Temperature detected by refrigerant temperature sensor 25 (discharged refrigerant temperature)
When either one of Td ₁ and the temperature detected by the refrigerant temperature sensor 26 (discharged refrigerant temperature) Td ₂ rises to the set value Tdx, the PMV 18 of the cooling bypass 17 is opened and its opening is set to the higher one of Td ₁ and Td _2. Means to control according to.

[8] Means for setting the trial operation mode and sending the trial operation command to the indoor unit when receiving the trial operation mode command from the centralized remote controller 54. [9] In the trial operation mode, the number N and the capacity V of the indoor units connected to the outdoor unit are detected by the transmission signal from the indoor unit.

[10] Total value Vm of each detected capacity V and total value Vsm of each set capacity Vs in the central remote controller 54
Means to ask for each. [11] First determination means for determining the presence or absence of a connection abnormality by comparing the detected number N of connected units and the number Ns set in the central remote controller 54.

[12] Total value Vm and total value Vsm obtained above
Second judging means for judging the presence or absence of a connection abnormality by comparison with [13] Means for notifying the centralized remote controller 54 of the judgment results of the first and second judgment means, together with the presence or absence of an abnormality on the indoor side.

[14] Centralized remote controller 54 in the trial operation mode
A means for operating the compressors 1 and 2 and receiving a second step start instruction to all the connected indoor units when receiving a start instruction from the compressor.

[15] After the second step start command is transmitted, the number L of signals received from the indoor unit indicating the state change detection is compared with the number N of connected units to determine whether or not there is a connection abnormality. 3 determination means.

[16] Means for notifying the centralized remote controller 54 of the judgment result of the third judging means. On the other hand, the centralized remote controller 54 has the following functional means. [1] A means for sending a trial run mode command to each outdoor unit when the trial run switch 54b is turned on.

[2] When the determination results of the first and second determining means, which are notified from the outdoor units, are normal and there is no abnormality on the indoor side, start commands are sequentially issued to the outdoor units with a time difference. Means of sending.

[3] Means for displaying each determination result informed from each outdoor unit on the display 54a. Next, the operation of the above configuration will be described. Figure 3 shows the operation of the outdoor unit
4, the operation of the indoor unit is shown in the flowchart of FIG. 5, and the operation of the centralized remote controller 54 is shown in the flowchart of FIG.

At the time of installation, the worker manually connects the refrigerant pipes and the signal lines between each outdoor unit and each indoor unit. Then, the number of indoor units Ns and the capacity Vs to be connected to each outdoor unit are controlled by the central remote controller 54.
Set with.

When the connection work is completed and the setting of the number Ns and the capacity Vs is completed, the worker turns on the power source 51 of each outdoor unit and the power source 61 of each indoor unit, and also the trial run switch 54b of the central remote controller 54. Turn on.

When the trial run switch 54b is turned on, the trial run mode is set, and the trial run mode command is sent from the outdoor unit to each indoor unit. Each indoor unit starts the time count t at the same time when the power is turned on, and if the trial operation mode command is not received from the outdoor unit within the predetermined time t ₁ , it is determined that the signal line connection with the outdoor unit is not made. The display 62a of the remote controller 62 displays characters indicating that there is an abnormality on the indoor side.

When the test operation mode command is input from the outdoor unit to the indoor unit within the predetermined time t ₁ , the indoor unit reads the capacity data of the indoor unit from the internal memory,
Send it to the outdoor unit.

When the indoor unit receives signals from the two outdoor units in duplicate (when the two outdoor units are erroneously connected to the indoor unit), the indoor unit notifies the outdoor unit of the abnormality. , Is displayed on the display 62a of the remote controller 62 in characters.

The outdoor unit detects the number of signals (capacity data) transmitted and received from the indoor unit as the number N of connected indoor units. Further, the outdoor unit detects the capacitance V of the indoor unit connected to the outdoor unit based on the content (capacity data) of the received signal, and the total value Vm of the detected capacitances V and the central remote controller 54. The total value Vsm of each set capacity Vs is obtained.

The detected number N of connected devices is the same as the number Ns set in the central remote controller 54, and the total value Vm and the total value V
If sm is the same and there is no abnormality on the indoor side, the outdoor unit determines that the first step is normal (no connection abnormality),
This is notified to the centralized remote controller 54.

However, when the number N of connected units is different from the set number Ns, the number of connected units N is indicated by the display 54a of the central remote controller 54.
The characters are displayed with and it is determined that the first step is abnormal (there is a connection abnormality). If the total value Vm and the total value Vsm are different, or if there is an abnormality on the indoor side, it is determined that the abnormality is the first step. When the first step abnormality is determined, the centralized remote controller 54 is notified to that effect.

The central remote controller 54 has the normal first step,
The number of connected devices N and the abnormality in the first step are displayed by characters on the display 54a. Here, an example in which the pipe connection and the signal line connection are normal is shown in FIG. 7, and an example in the case of abnormal connection is shown in FIG.

That is, in the example of FIG. 8, the piping connection is normal, but the indoor unit B ₃ of the system of the outdoor unit A ₁
Is connected to the outdoor unit A ₂ which is another system by a signal line,
Moreover, the signal line connection between the outdoor unit A ₂ and the indoor unit B ₄ is forgotten.

In this case, no test operation mode command is input to the indoor unit B ₄ from either the outdoor unit A ₁ or A ₂ . Therefore, the indoor unit B ₄ determines that there is an abnormality on the indoor side and displays it with the attached remote controller 62.

The number of units to be connected to the outdoor unit A ₁ (=
Although the set number Ns) is three, the actual number N of connections detected by the outdoor unit A ₁ is two, and the two numbers do not match. Moreover, compared with the total value Vsm of the capacity of the indoor units to be connected to the outdoor unit A ₁ (= setting capacity Vs), the sum Vm of the actual volume V of the outdoor unit A ₁ is detected is reduced. Therefore, the outdoor unit A
₁ judges the connection abnormality and displays it with the centralized remote controller 54.

By looking at the remote control display, the worker recognizes that there is a connection abnormality with respect to the indoor unit B ₄ and the outdoor unit A _1, and will redo the work. Then, after the completion of this work, the trial run is performed again.

Here, it suffices if proper connection is completed.
The indoor unit B ₄ and the outdoor unit A ₁ may be erroneously connected. In this case, the set number Ns and the connected number N will match. Moreover, if the capacity of the indoor unit B ₄ is the same as the capacity of the indoor unit B ₃ , the set capacity total value Vsm and the detected capacity total value Vm in the outdoor unit A ₁ will match. In this case, it is determined that the first step is normal even though the connection is incorrect.

Therefore, when the first step is normal, the centralized remote controller 54 sequentially sends start commands with a time lag to each outdoor unit. Centralized remote control 54 for each outdoor unit
When the start command is received from the compressors 1 and 2, the compressors 1 and 2 are operated and the second step start command is sent to all the indoor units.

The indoor unit which receives the second step command fully opens the PMV 32, and the refrigerant pressure sensor 3
The detection pressure Pe _{2 of} 6 and the detection temperature Te ₁ of the refrigerant temperature sensor 37 are monitored.

When the PMV 32 is fully opened, the refrigerant flows through the indoor heat exchanger 33. Due to this circulation of the refrigerant, the detected pressure Pe ₂ of the refrigerant pressure sensor 36 and the detected temperature Te ₁ of the refrigerant temperature sensor 37 change. The indoor unit that has detected a change in at least one of the pressure and the temperature sends a change detection signal to the outdoor unit.

When the indoor unit B ₄ and the outdoor unit A ₁ are erroneously connected as in the above example, the outdoor unit
When operating A ₁ , the indoor unit B ₁ , which is the connection target,
Only the state changes in B _1, B ₂ of the B _2, B ₃ is detected, the state changes in the B ₃ is not detected.

The outdoor unit counts the number L of received change detection signals sent from each indoor unit and compares it with the set number Ns. In the above example, since L and Ns do not match, the outdoor unit determines that the second step is abnormal and displays it with the central remote controller 54.

The worker who is aware of the abnormality in the second step recognizes that the outdoor unit and the indoor unit are erroneously connected in different systems, and redoes the work. In this way, just by setting the test operation mode, it is possible to quickly and surely check whether the connection between the outdoor unit and each indoor unit is correct without burdening the workers, even if the number of connected units is large. You can Therefore, work efficiency at the time of installation can be improved and proper operation can be performed.

[0073]

As described above, the air conditioner of the first invention detects the number and capacity of the indoor units connected to each outdoor unit by communication through the bus communication line, and the detected number and detection. A configuration that compares the capacity with the preset number of units and the preset capacity to determine whether there is a connection error, and detects erroneous connection between multiple outdoor units and one indoor unit by communication via a bus communication line. Therefore, it is possible to check whether the connection between the outdoor unit and each indoor unit is correct, even if there are many units, quickly and reliably without burdening the workers. An air conditioner that can improve work efficiency and can be operated properly can be provided.

The air conditioner of the second aspect of the invention detects the number and capacity of the connected indoor units in each outdoor unit, compares the detected number and capacity with the preset number and set capacity, and detects the connection abnormality. The presence / absence of each outdoor unit is further determined, and when a reception signal is received from a plurality of outdoor units, it is determined that there is a connection abnormality, and when each determination result indicates that there is no connection abnormality, each outdoor unit is operated one by one. Since the change in the state of each indoor unit is detected during operation and whether or not there is a connection abnormality is determined based on the detection result, it is possible to determine whether the connection between the outdoor unit and each indoor unit is correct, even if the number of units is large. However, the inspection can be performed quickly and surely without imposing a burden on the operator, which improves the work efficiency during installation and is suitable. It can provide an air conditioner capable Do operation.

In the air conditioner of the third invention, in addition to the structure of the first or second invention, the judgment result is displayed by the remote control type operation device. Even if the number of units is large, it can be checked quickly and surely whether the connection of is correct, without imposing a burden on the worker, which can improve the work efficiency at the time of installation and ensure proper operation. A possible air conditioner can be provided.

[Brief description of drawings]

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

FIG. 2 is a block diagram showing a configuration of a control circuit of the same embodiment.

FIG. 3 is a flowchart for explaining the operation of each outdoor unit of the same embodiment.

FIG. 4 is a flowchart following FIG. 3;

FIG. 5 is a flowchart for explaining the operation of each indoor unit in the same embodiment.

FIG. 6 is a flowchart for explaining the operation of the centralized remote controller in the same embodiment.

FIG. 7 is a diagram showing a normal connection example according to the embodiment.

FIG. 8 is a diagram showing an abnormal connection example according to the embodiment.

[Explanation of symbols]

A ₁ , A ₂ ... Outdoor unit, B _{1 to} B ₆ ... Indoor unit, 1 ... Variable capacity compressor, 2 ... Fixed capacity compressor, 8 ... Outdoor heat exchanger, PMV (flow rate adjusting valve), 33 ... Indoor heat Exchanger, 50 ... Outdoor control unit, 54 ... Centralized remote controller, 54a ...
Display, 54b ... Trial run switch, 60 ... Indoor control unit, 62 ... Remote control, 62a ... Display.

Claims (3)

[Claims] 1. A refrigeration cycle unit is constructed by connecting a plurality of indoor units, each having an indoor heat exchanger, with a refrigerant pipe to one outdoor unit having a compressor and an outdoor heat exchanger. An operation to set the number and capacity of indoor units to be connected to each outdoor unit in an air conditioner in which multiple outdoor cycle units and each indoor unit are connected by a bus communication line for each of the multiple refrigeration cycle units Means and detecting means for detecting the number and capacity of indoor units connected to each outdoor unit by communication through a bus communication line, and comparing this detected number and capacity with the set number and set capacity, connection abnormality There is a judgment means for judging the presence / absence of the presence / absence, and an incorrect connection between plural outdoor units and one indoor unit An air conditioner characterized by comprising detection means for detecting the signal, the. 2. In an air conditioner comprising a plurality of outdoor units, each of which has a plurality of indoor units connected by pipes and signal lines, the number and capacity of the indoor units to be connected to each outdoor unit are set. Means for transmitting the capacity data of the indoor unit to each connected outdoor unit, which is provided in each indoor unit, and an indoor unit connected to the outdoor unit, which is provided in each outdoor unit The means for detecting the number and the capacity of the indoor units by the transmission signal from the indoor unit, the means for judging the presence or absence of the connection abnormality by comparing the detected number and the capacity with the set number and the set capacity are provided in each indoor unit. , A unit that determines whether there is a connection error when receiving signals from multiple outdoor units, and When there is no connection abnormality, a means for sequentially operating each outdoor unit one by one, a means for detecting a state change of each indoor unit during operation of each outdoor unit, and the presence or absence of connection abnormality depending on the detection result. An air conditioner characterized by comprising: 3. The air conditioner according to claim 1 or 2, wherein a plurality of remote control type operators connected to each indoor unit and a remote control type for centralized control commonly connected to each outdoor unit. 1. An air conditioner, comprising: one operation device of (1) and means for displaying each of the determination results provided in these operation devices.