JPH0875226A - Multi-type air-conditioning machine - Google Patents

Abstract

PURPOSE: To provide a multi-type air-conditioning machine capable of deciding whether an outdoor machine is connected correctly to respective indoor machines or not. CONSTITUTION: The control unit 8 of an outdoor machine 50 starts a compressor and opens only a motor-driven valve 4A. Subsequently, the connection judging unit 8a of the control unit 8 judges that refrigerant pipelines 11, 12 between indoor machines 5A, 5B, 5C, which are corresponding to the opened motor-driven valves 4A, 4B, 4C, and the outdoor machine 50 are connected correctly when a low-pressure switch 7 is not operated after a predetermined period of time has elapsed. On the other hand, when the low-pressure switch 7 is operated, it is judged that the refrigerant pipelines 11, 12 between the indoor machines 5A, 5B, 5C, corresponding to the opened motor-driven valves 4A, 4B, 4C, and the outdoor machine 50 are not connected yet. In the same manner, the motor- driven valve 4A is closed and only the motor-driven valve 4B is opened to detect the non-connection. Further, the motor-driven valve 4B is closed and only the motor-driven valve 4C is opened to detect the non-connection in the same manner.

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 constructed by connecting a plurality of indoor units to one outdoor unit.

[0002]

2. Description of the Related Art Conventionally, as a multi-type air conditioner, there is one described in JP-A-2-97848. This multi-type air conditioner is configured by connecting a plurality of indoor units A, B, C, D to one outdoor unit X, as shown in FIG. 6 (a). In the multi-type air conditioner, four refrigerant pipes 41 for circulating a refrigerant between the outdoor unit X and each indoor unit A, B, C, D, the outdoor unit X and each indoor unit A, B, C, Four signal wirings 40 for transmitting control signals to and from D are provided in correspondence with each other.

FIG. 7 is a circuit diagram of the multi-type air conditioner, in which the liquid pipe 20 and the gas pipe 21 constitute a refrigerant pipe 41 shown in FIG. 6 (a). When the multi-type air conditioner is to be cooled, the four-way switching valve 102 is set to the switching position shown by the solid line in the figure, and the fan 35 is rotated.
Then, the refrigerant discharged from the compressor 101 is supplied to the outdoor heat exchanger 103 serving as a condenser, the first electric valve 108, and the second electric valve 2
3A, 23B, 23C, and 23D, each indoor heat exchanger 22 used as an evaporator, and the accumulator 106 are made to flow. At this time, on the outdoor unit X side, the first electric valve 108 is fully opened, and the gas pipes 19A, 19B, 19C, 1 in the outdoor unit X are opened.
9D temperature sensors 32A, 32B, 32 respectively provided
Based on the outputs of C and 32D, the second electric valves 23A and 23
Superheat control is performed with B, 23C and 23D. Note that the second electric valve corresponding to the indoor unit in the cooling stop room is fully closed.

On the other hand, when performing heating operation of the multi-type air conditioner, the four-way switching valve 102 is positioned at the switching position shown by the broken line in the figure, and the refrigerant discharged from the compressor 101 serves as a heat exchanger for indoor heat exchange. Device 22, second electric valve 23A, 23B,
23C, 23D, the first electric valve 108, the outdoor heat exchanger 103 serving as an evaporator, and the accumulator 106. In addition, 31 is a temperature sensor that detects the temperature of the indoor heat exchanger 22, 33 is a temperature sensor that detects the room temperature of each room, 34 is a temperature sensor that detects the temperature of the outdoor heat exchanger, and 37 is the outside air temperature. The temperature sensor is shown.

In the multi-type air conditioner having the above structure,
When performing a trial run at the end of the installation work, as shown in FIG. 6A, the refrigerant pipe 41 connecting the outdoor unit X and each indoor unit A, B, C, D, the outdoor unit X and each indoor unit A, It is determined whether or not the signal wirings 40 connecting B, C and D are correctly connected to each other. For example, as shown in FIG.
Since the signal wiring 40 to be connected to the indoor unit A may be connected to the indoor unit B and the signal wiring 40 to be connected to the indoor unit B may be connected to the indoor unit C due to incorrect wiring, the connection confirmation is performed. . That is, the indoor units A, B, C, D are sequentially set to the cooling operation mode and operated, and the temperature sensors 32A, 32B, provided in the gas pipes 19A, 19B, 19C, 19D in the outdoor unit X are arranged. Based on the output of 32C, 32D,
The determination is made by detecting which of the gas pipes 19A, 19B, 19C, 19D the temperature drops.

[0006]

By the way, in the above-mentioned multi-type air conditioner, the temperature sensors 32A, 32B, 32C,
Based on 32D, gas pipes 19A, 19B, 19C, 1
Since it is detected that the temperature of 9D is lowered, it takes time to detect miswiring. Therefore, when the refrigerant pipe 41 is not connected to the indoor unit that should be connected to the outdoor unit X, the compressor 101 is pumped down when the indoor unit that is not connected is detected, and the reliability of the compressor 101 decreases. There is a problem of being damaged.

Therefore, an object of the present invention is to determine whether or not the outdoor unit and each indoor unit are properly connected, and to prevent pump down of the compressor even if there is an unconnected indoor unit. To provide a machine.

[0008]

In order to achieve the above object, a multi-type air conditioner according to claim 1 includes a compressor, an outdoor heat exchanger connected to the compressor, and the outdoor heat exchanger. An outdoor unit having a plurality of electric valves, one end of which is connected via a branched refrigerant pipe, and a control unit for controlling the compressor and controlling the opening and closing of the plurality of electric valves, and the outdoor unit described above. A plurality of indoor units each having an indoor heat exchanger, one end of which is connected to the other ends of the plurality of motor-operated valves via a refrigerant pipe, and the other end of which is connected to the compressor via a refrigerant pipe. In a type air conditioner, a low pressure switch that operates when the refrigerant pressure on the suction side of the compressor is below a predetermined value, and the control means opens only one of the plurality of electric valves, and After starting, the above-mentioned low When the switch does not operate, it is determined that the indoor unit corresponding to the opened electric valve and the outdoor unit are correctly connected, while when the low pressure switch operates, the indoor unit corresponding to the opened electric valve It is characterized in that it is provided with a connection discriminating means for discriminating that the machine and the outdoor unit are not connected.

The multi-type air conditioner according to claim 2 is
A compressor, an outdoor heat exchanger connected to the compressor, a plurality of electric valves connected at one end via a refrigerant pipe branched to the outdoor heat exchanger, and controlling the compressor and An outdoor unit having a control means for controlling the opening and closing of a plurality of electric valves, one end is connected to the other end of the plurality of electric valves of the outdoor unit via a refrigerant pipe, respectively, the other end via a refrigerant pipe. In a multi-type air conditioner comprising a plurality of indoor units each having an indoor heat exchanger connected to the compressor, and a signal wiring connecting the plurality of indoor units to the outdoor unit,
A temperature sensor provided in the plurality of indoor units to detect the temperature of the indoor heat exchanger, and an initial value of the temperature of the indoor heat exchanger detected by the temperature sensor and the temperature sensor for each of the plurality of indoor units. Corresponding to the indoor unit of the integrated value obtained by integrating the temperature difference with the temperature of the indoor heat exchanger detected by the temperature difference integrating means for obtaining integrated values respectively for a predetermined period. When the integrated value is equal to or more than a predetermined value, it is determined that the signal wiring between the outdoor unit and the indoor unit is properly connected, while when the integrated value is less than the predetermined value, the outdoor unit and the indoor unit And a connection discriminating means for discriminating that the signal wiring is not connected.

The multi-type air conditioner according to claim 3 is
A compressor, an outdoor heat exchanger connected to the compressor, a plurality of electric valves connected at one end via a refrigerant pipe branched to the outdoor heat exchanger, and controlling the compressor and An outdoor unit having a control means for controlling the opening and closing of a plurality of electric valves, one end is connected to the other end of the plurality of electric valves of the outdoor unit via a refrigerant pipe, respectively, the other end via a refrigerant pipe. In a multi-type air conditioner comprising a plurality of indoor units each having an indoor heat exchanger connected to the compressor, and a signal wiring connecting the plurality of indoor units to the outdoor unit,
A low pressure switch that operates when the refrigerant pressure on the suction side of the compressor is less than or equal to a predetermined value, a temperature sensor that is provided in the plurality of indoor units and detects the temperature of the indoor heat exchanger, and a plurality of the indoor units. In the temperature difference integrating means for obtaining the integrated value obtained by integrating the temperature difference between the initial value of the temperature of the indoor heat exchanger detected by the temperature sensor and the temperature of the indoor heat exchanger detected by the temperature sensor for a predetermined period, respectively. If the control means opens only one of the plurality of electric valves and the low pressure switch does not operate after a predetermined time has elapsed after starting the compressor, the control means corresponds to the opened electric valve. While determining that the indoor unit and the outdoor unit are properly connected,
When the low-pressure switch operates, it is determined that the indoor unit and the outdoor unit corresponding to the opened electric valve are not connected, and the indoor unit out of the integrated values integrated by the temperature difference integrating unit. When the integrated value corresponding to the machine is a predetermined value or more, it is determined that the signal wiring between the outdoor unit and the indoor unit is correctly connected, while when the integrated value is less than the predetermined value, the outdoor unit And a connection discriminating means for discriminating that the signal wiring to the indoor unit is not connected.

The multi-type air conditioner of claim 4 is
In the multi-type air conditioner according to claim 2 or 3, the temperature difference between the initial value of the temperature of the indoor heat exchanger detected by the temperature sensor and the temperature of the indoor heat exchanger detected by the temperature sensor. And a fan control means for stopping the fans of the plurality of indoor units while integrating the difference.

[0012]

According to the multi-type air conditioner of claim 1,
After installation work or the like, the control means opens only one of the plurality of electric valves to start the compressor.
After that, when the low pressure switch does not operate after a predetermined time elapses, the connection determining means determines that the indoor unit and the outdoor unit corresponding to the opened electric valve are correctly connected, while the low pressure switch operates. In this case, it is determined that the indoor unit and the outdoor unit corresponding to the opened electric valve are not connected. Then, the control means sequentially closes the opened electric valve and then opens only one of the other electric valves, and the connection determination means similarly determines the connection state between the outdoor unit and the indoor unit. . Therefore, by using the above-mentioned low-voltage switch, it is possible to detect the non-connection promptly as compared with the case where the temperature decrease of the refrigerant pipe is detected.

Therefore, it is possible to determine whether or not the outdoor unit and each indoor unit are connected, and by detecting in a short time, the compressor goes into a pump down state when the indoor unit to be connected is not connected. Can be prevented.

Further, according to the multi-type air conditioner of the second aspect, the temperature difference integrating means sets the initial value of the temperature of the indoor heat exchanger detected by the temperature sensor for each of the plurality of indoor units. An integrated value obtained by integrating the temperature difference with the temperature of the indoor heat exchanger detected by the temperature sensor for at least a predetermined period is obtained. When the connection determining means determines that the indoor unit corresponding to the opened electric valve and the outdoor unit are correctly connected, it corresponds to the indoor unit of the integrated values accumulated by the temperature difference integrating means. When the integrated value to be
While it is determined that the signal wiring between the outdoor unit and the indoor unit is properly connected, when the integrated value is less than the predetermined value, it is determined that the signal wiring between the outdoor unit and the indoor unit is not connected. .

Therefore, it is possible to determine whether or not the signal wiring connecting the outdoor unit and each indoor unit is properly connected. Even if the temperature difference is small, the integrated value based on the temperature difference can be increased to improve the accuracy of detecting the connection state of the signal wiring between the outdoor unit and the indoor unit. Further, since the integrated value of the temperature difference is larger than that of detecting the connection state between the outdoor unit and the indoor unit based on the temperature difference, even if the temperature change of the indoor heat exchanger is gentle, The connection detection time can be shortened.

According to the multi-type air conditioner of the third aspect, after the installation work or the like, the control means opens only one of the plurality of electric valves to start the compressor. After that, when the low pressure switch does not operate after a predetermined time elapses, the connection determining means determines that the indoor unit and the outdoor unit corresponding to the opened electric valve are correctly connected, while the low pressure switch operates. In this case, it is determined that the indoor unit and the outdoor unit corresponding to the opened electric valve are not connected. Then, the control means sequentially closes the opened electric valve and then opens only one of the other electric valves, and the connection determination means similarly determines the connection state between the outdoor unit and the indoor unit. . Therefore, by using the low-pressure switch, the disconnection can be detected promptly as compared with the case where the temperature decrease of the refrigerant pipe is detected. Further, the temperature difference integrating means, for each of the plurality of indoor units, the temperature difference between the initial value of the temperature of the indoor heat exchanger detected by the temperature sensor and the temperature of the indoor heat exchanger detected by the temperature sensor. An integrated value obtained by integrating for a predetermined period is obtained. When the connection determining means determines that the indoor unit corresponding to the opened electric valve and the outdoor unit are correctly connected, it corresponds to the indoor unit of the integrated values accumulated by the temperature difference integrating means. When the integrated value is equal to or more than a predetermined value, it is determined that the signal wiring between the outdoor unit and the indoor unit is correctly connected, while when the integrated value is less than the predetermined value, the outdoor unit and the indoor unit It is determined that the signal wiring is not connected.

Therefore, it can be determined whether the refrigerant pipes connecting the outdoor unit and each indoor unit and the signal wiring are correctly connected to each other, and by detecting in a short time, the indoor unit to be connected is not found. It can prevent the compressor from being pumped down when connected. Even if the temperature difference is small, the accuracy of detecting the connection state between the outdoor unit and the indoor unit can be improved by increasing the integrated value based on the temperature difference. Further, since the integrated value of the temperature difference is larger than that of detecting the connection state between the outdoor unit and the indoor unit based on the temperature difference, even if the temperature change of the indoor heat exchanger is gentle, The connection detection time can be shortened.

According to the multi-type air conditioner of the fourth aspect, in the multi-type air conditioner of the second or third aspect, the fan control means controls the temperature of the indoor heat exchanger detected by the temperature sensor. The fans of the plurality of indoor units are stopped while the temperature difference integrating means integrates the temperature difference between the initial value of the temperature and the temperature of the indoor heat exchanger detected by the temperature sensor.
Therefore, while the temperature difference integrating means integrates the temperature difference, the heat exchange of the indoor heat exchanger of the indoor unit is hardly performed, and the temperature of the indoor heat exchanger detected by the temperature sensor is when the fan is rotating. Will be lower than.

Therefore, the temperature difference between the initial value of the temperature of the indoor heat exchanger and the temperature of the indoor heat exchanger becomes large, and the integrated value based on the temperature difference also becomes large, further improving the detection accuracy of the unconnected state. it can.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A multi-type air conditioner of the present invention will be described in detail below with reference to an embodiment.

FIG. 1 is a circuit diagram of a multi-type air conditioner according to an embodiment of the present invention, in which 1 is a compressor, 2 is a four-way valve connected to the discharge side of the compressor 1, and 3 is a compressor. Four way valve 2
The outdoor heat exchangers 4A, 4B, 4C connected with the motor-operated valves 5A, 5B, 5C, one end of which is connected to the other end of the outdoor heat exchanger 3 via the refrigerant pipes 10A, 10B, 10C respectively, This is an indoor unit in which one ends are connected to the other ends of the motor-operated valves 4A, 4B, 4C via a refrigerant pipe 11. The other ends of the indoor units 5A, 5B, 5C are connected to the compressor 1 via a refrigerant pipe 12 and refrigerant pipes 13A, 13B, 13C. The suction side of the compressor 1 and the four-way valve 2 are connected by a refrigerant pipe 14, and the accumulator 6 is arranged in the refrigerant pipe 14. A low pressure switch (LPS) 7 is connected between the compressor 1 and the accumulator 6 of the refrigerant pipe 14 via a refrigerant pipe 14a. Then, the signal wiring 15 from each indoor unit 5A, 5B, 5C is connected to the control unit 8 as a control means for receiving the operation signal from the low pressure switch 7 and outputting the control signal to the motor operated valves 4A, 4B, 4C. are doing. Denoted by 9 is a solenoid valve for defrost disposed between the other end of the outdoor heat exchanger 3 and the four-way valve 2, 55A, 55B, 55C are refrigerant pipes 13A, 13B,
A temperature sensor for detecting the temperature of 13C, a temperature sensor 56 for detecting the temperature of the outdoor heat exchanger 3, a temperature sensor 57 for detecting the ambient temperature, and a temperature sensor 58 for detecting the discharge pipe temperature of the compressor 1. is there. The compressor 1 and the four-way valve 2
, The outdoor heat exchanger 3, the motor-operated valves 4A, 4B, 4C, the low pressure switch 7, the defrost electromagnetic valve 9, and the temperature sensor 55.
The outdoor unit 50 is constituted by A, 55B, 55C, 56, 57 and 58.

The indoor units 5A, 5B and 5C are connected to the motor-operated valves 4A, 4B and 4C of the outdoor unit 50 at one end via a refrigerant pipe 11 and the other end via a refrigerant pipe 12 to the outdoor unit. 5
Indoor heat exchanger 51 connected to 0, and indoor heat exchanger 51
Temperature sensor 52 for detecting the temperature of the indoor heat exchanger, a temperature sensor 53 for detecting the indoor temperature, a temperature sensor 54 for detecting the refrigerant temperature of the refrigerant pipe 12 on the indoor heat exchanger 51 side, and a fan for the indoor heat exchanger 51. 55 and 55 respectively.

The control unit 8 of the outdoor unit 50 includes a connection determination unit 8a as a connection determination unit, a temperature difference integration unit 8b as a temperature difference integration unit, and a fan control unit 8c as a fan control unit. Have After starting the compressor 1, the connection determination unit 8a of the control unit 8 determines whether or not the outdoor unit 50 is connected to the indoor units 5A, 5B, and 5C based on the operation of the low-voltage switch 7. Further, the temperature difference integrating unit 8b of the control unit 8 receives a signal indicating the temperature of the indoor heat exchanger 51 detected by the temperature sensor 52 from the indoor units 5A, 5B, 5C, and receives the indoor units 5A, 5B, The temperature difference between the initial value of the temperature of the indoor heat exchanger 51 of 5C and the temperature of the indoor heat exchanger 51 is integrated for a predetermined time, and the integrated value of each temperature difference is obtained. further,
When detecting disconnection between the outdoor unit 50 and the indoor units 5A, 5B, 5C, the fan control unit 8c of the control unit 8 turns the fans 55 of all the indoor units 5A, 5B, 5C to detect the temperature difference. Integrating part 8b
Is the initial value of the temperature of the indoor heat exchanger 51 and the indoor heat exchanger 51.
The fans 55 of all the indoor units 5A, 5B, 5C are stopped during the predetermined period in which the temperature difference from the temperature is accumulated.

In the multi-type air conditioner having the above structure,
After the installation work or the like, as shown in FIGS. 2A to 2M, the unconnected state between the outdoor unit 50 and the indoor units 5A, 5B, 5C is detected. Hereinafter, a case where the refrigerant pipes of the indoor units 5A and 5C and the outdoor unit 50 are correctly connected and the refrigerant pipes of the indoor unit 5B and the outdoor unit 50 are not connected will be described. The indoor units 5A, 5B and 5C are assumed to be installed in rooms A, B and C, respectively.

First, the control unit 8 of the outdoor unit 50 opens the motor-operated valve 4A of the A port and starts the compressor 1 at a predetermined operating frequency (target frequency) (FIGS. 2 (a) and 2 (b)). , (e)). At this time, as shown in FIG. 2 (i), the fans 55 of all the indoor units 5A, 5B, 5C are turned to start forced air blowing. Then, after the timer time of the unconnection detection prohibition timer TK1A (shown in FIG. 2 (h)) has elapsed, the connection determination means 8a of the control unit 8 causes the operation signal of the low-voltage switch 7 (within the timer time of the unconnection determination timer TK2 ( 2 (d)) is determined. In this case, the refrigerant pressure on the suction side of the compressor 1 (shown in FIG. 2 (c)) is not a low pressure below a predetermined value, and the low-pressure switch 7 is not operating, so that the connection determining means 8a causes the motor-operated valve 4a to operate. It is determined that the indoor unit 5A and the outdoor unit 50 of the corresponding room A are properly connected via the refrigerant pipes 11 and 12. Then, the fan control unit 8c stops the fans 55 of all the indoor units 5A, 5B, 5C.
Then, within the timer time of the next connected room detection timer TK3, the temperature difference integration unit 8b of the control unit 8 causes the initial value of the temperature DCA and the temperature D of the indoor heat exchanger 51 of the indoor unit 5A.
The integrated value of the temperature difference from CA (shown in FIG. 2 (j)), the initial value of the temperature DCB of the indoor heat exchanger 51 of the indoor unit 5B and the temperature DCB (FIG. 2).
(shown in (k)) and the initial value and temperature DCC of the temperature DCC of the indoor heat exchanger 51 of the indoor unit 5C (see FIG. 2).
(indicated in (m)) and the integrated value of the temperature difference. And
The connection discriminating means 8a of the control unit 8 uses the initial value of the temperature DCA and the temperature DCA of the indoor heat exchanger 51 of the indoor unit 5A of the room A.
It is determined that the indoor unit 5A is correctly connected to the A port, assuming that only the integrated value of the temperature difference from (shown in FIG. 2 (j)) is equal to or greater than the predetermined value. Note that the unconnection detection prohibition timer TK1A
This prevents erroneous detection when starting the compressor.

Next, the control unit 8 of the outdoor unit 50 closes the A-port electric valve 4A and opens the B-port electric valve 4B, and the fan control unit 8c controls all the indoor units 5A, 5B, 5C. The fan 55 is rotated to forcibly blow air (shown in FIGS. 2 (e), 2 (f) and 2 (i)). Then, after the elapse of the timer time of the unconnection detection prohibition timer TK1B (shown in FIG. 2 (h)), the connection determination means 8a of the control unit 8
Determines the operation signal (shown in FIG. 2D) of the low-voltage switch 7 within the timer time of the unconnection determination timer TK2. In this case, since the indoor unit 5B is not connected to the B port of the outdoor unit 50, the refrigerant pressure on the suction side of the compressor 1 (shown in FIG. 2 (c)) becomes a low pressure below a predetermined value, Low voltage switch 7
Works. Therefore, the connection determining unit 8a of the control unit 8 determines that the outdoor unit 50 and the indoor unit 5B are not connected, and the connection determining unit 8a does not integrate the temperature difference.

Next, the control section 8 of the outdoor unit 50 closes the B-port electric valve 4B and opens the C-port electric valve 4C.
(Shown in FIGS. 2 (f) and 2 (g)). Then, after a lapse of the timer time of the unconnection detection prohibition timer TK1C (shown in FIG. 2 (h)), the connection determination means 8a of the control unit 8 causes the operation signal of the low voltage switch 7 (within the timer time of the unconnection determination timer TK2). 2 (d)) is determined. In this case, since the C port of the outdoor unit 50 and the indoor unit 5C are connected, the refrigerant pressure on the suction side of the compressor 1 (shown in FIG. 2 (c)) is not below a predetermined value, and the low pressure switch 7 is Since it is not operating, the connection determining means 8a determines that the indoor unit 5C of the C chamber corresponding to the motor-operated valve 4c and the outdoor unit 50 are correctly connected via the refrigerant pipes 11 and 12. Then, the fan control unit 8c controls all the indoor units 5A,
After the 5B and 5C fans 55 are stopped, the temperature difference integrating unit 8b of the control unit 8 causes the initial temperature DCA of the indoor heat exchanger 51 of the indoor unit 5A to start within the timer time of the next connected room detection timer TK3. Value and integrated value of temperature difference between temperature DCA (shown in FIG. 2 (j)), temperature DCB of indoor heat exchanger 51 of indoor unit 5B
Initial value of the temperature DCB (shown in FIG. 2 (k)) and the initial value of the temperature DCC of the indoor heat exchanger 51 of the indoor unit 5C and the temperature DCC (shown in FIG. 2 (m)) And the integrated value of the temperature difference between and. Then, the connection determination means 8 of the control unit 8
a is the temperature DCC of the indoor heat exchanger 51 of the indoor unit 5C in the C room
It is determined that the indoor unit 5C is properly connected to the C port on the assumption that the integrated value of the temperature difference between the initial value of the temperature and the temperature DCC (shown in FIG. 2 (j)) is greater than or equal to a predetermined value.

The operation of the unconnected detection process of the control unit 8 of the outdoor unit 50 will be described below with reference to the flowcharts of FIGS. 3, 4 and 5.

First, in FIG. 3, when the outdoor unit 50 and the indoor units 5A, 5B, 5C are turned on and started, it is determined in step S1 whether or not the function of erroneous pipe miswiring is confirmed, and erroneous pipe misoperation is determined. If the wiring function is not confirmed, step S1
On the other hand, when the function of the incorrect pipe miswiring is confirmed, the process proceeds to step S2 to perform the process of detecting the incorrect pipe miswiring, that is, the unconnection. That is, it is determined whether or not the erroneous pipe miswiring function performed when the power is turned on is selected by a selection switch (not shown) or the like.

Next, in step S2, the compressor 1 of the outdoor unit 50 is turned on. Next, in step S3, all rooms A, B,
The fan 55 of the indoor unit 5A, 5B, 5C of C is turned on. Then, in step S4, initial values DCAZ, DCBZ, D
The temperature DCA, DCB, DCC of the indoor heat exchanger 51 in CCZ
Is set and initialized, and flags 1 and 2 described later are set to 0.

Next, in step S5, the A of the outdoor unit 50 is
Open the motorized valve 4A of the port and operate the motorized valves 4B and 4C of the other ports.
Is closed and the unconnection detection prohibition timer TK1A is started. Next, in step S6, the unconnection detection prohibition timer TK1
After counting A, the process proceeds to step S7, and it is determined whether or not the count of the unconnection detection prohibition timer TK1A has ended. Then, in step S7, the unconnection detection prohibition timer T
If the count of K1A has not ended, step S6
Returning to step S3, the unconnection detection prohibition timer TK1A is counted again. On the other hand, if the counting of the unconnection detection prohibition timer TK1A has ended, the process proceeds to step S8.

Next, in step S8, the unconnected judgment timer T
Start K2. Then, in step S9, it is determined whether or not the low-voltage switch 7 is operating. If the low-voltage switch 7 is operating, the process proceeds to step S10, the flag 1 is set to 1, and the low-voltage switch 7 is operating. If not, step S10 is skipped.

Next, in step S11, the unconnection determination timer TK2 is counted, and the process proceeds to step S12. Then, in step S12, it is determined whether or not the count of the unconnection determination timer TK2 has ended, and the unconnection determination timer TK
If the count of 2 has not ended, the process returns to step S11, while if the count of the unconnection determination timer TK2 has ended, the process proceeds to step S13 shown in FIG. next,
In step S13, it is determined whether the low-voltage switch 7 is operating. If the low-voltage switch 7 is operating, the process proceeds to step S14, where the flag 2 is set to 1 and the low-voltage switch 7 is not operating. , Step S14 is skipped. Then, the process proceeds to step S15, and flag 1 = 1
And it is determined whether or not flag 2 = 1, and flag 1 =
If 1 and flag 2 = 1, the process proceeds to step S16, where it is determined that the A port is not connected, while flag 1
= 1 and flag 2 = 1 are not satisfied, the process proceeds to step S21 shown in FIG.

Next, in step S21, the connected room detection timer TK3 is started. Then, in step S22, the fans 55 of all the indoor units 5A, 5B, 5C are turned off, and the integrated value Δ
DCAA, ΔDCAB, and ΔDCAC are set to 0.

Next, in step S23, the temperature sampling timer THHK is started. Next, step S24.
, The temperature sampling timer TTHK is counted, and the process proceeds to step S25, the connected room detection timer TK
Count three. Then, in step S26, it is determined whether or not the count of the temperature sampling timer THHK has ended, and if the count of the temperature sampling timer THHK has ended, the process proceeds to step S27,
If the temperature sampling timer THHK has not finished counting, the process returns to step S24. Next, step S
At 27, the integrated value ΔDCAA = ΔDCAA + (DCAZ−DCA) integrated value ΔDCAB = ΔDCAB + (DCBZ−DCB) integrated value ΔDCAC = ΔDCAC + (DCAZ−DCC) is calculated.

Then, in step S28, it is determined whether or not the integrated value ΔDCAA is equal to or more than a predetermined value ΔDC1,
If the integrated value ΔDCAA is greater than or equal to the predetermined value ΔDC1, the process proceeds to step S29, and it is assumed that the indoor unit 5A in the room A is connected to the port A. On the other hand, in step S28, the integrated value Δ
If DCAA is less than the predetermined value ΔDC1, step S30
Proceed to.

Next, at step S30, the integrated value ΔDC is obtained.
It is determined whether AB is a predetermined value ΔDC1 or more, and the integrated value Δ
If DCAB is greater than or equal to the predetermined value ΔDC1, step S31
It is assumed that the indoor unit 5B in the room B is connected to the A port. On the other hand, in step S30, the integrated value ΔDCAB
Is less than the predetermined value ΔDC1, the process proceeds to step S32.

Next, at step S32, the integrated value ΔDC is obtained.
It is determined whether AC is a predetermined value ΔDC1 or more, and the integrated value Δ
If DCAC is greater than or equal to the predetermined value ΔDC1, step S33
It is assumed that the indoor unit 5C in the room C is connected to the port A. On the other hand, in step S32, the integrated value ΔDCAC
Is less than the predetermined value ΔDC1, the process proceeds to step S34.

Then, in step S34, it is determined whether or not the count of the connected room detection timer TK3 has ended. If the count of the connected room detection timer TK3 has ended, the process proceeds to step S35, and the connected room is not found. On the other hand, if the connection room detection timer TK3 has not been counted, the process returns to step S23 and steps S23 to S34 are repeated. Next, returning to step S3, similar processing is performed for the B port and the C port. In this case, in step S5, the A port motorized valve 4A
Instead of opening only the B-port motorized valve 4B, or only the C-port motorized valve 4C is opened, and in steps S29, S31, and S33, it is assumed that the B-port is connected to the A port. It shall be connected to the port or C port.

In this way, each of A, B, C for which the connection room has been determined
Either A, B, or C room corresponds to the port. Also,
If any one of the A, B, and C ports has an undetermined connection room, the port is associated with the undetermined connection room. Furthermore, when two or more connection rooms of the above A, B, and C ports are undetermined, the connection room is undetermined port,
Integrated value ΔDCAA, ΔDC when the port is not connected
Corresponds to the undetermined connection room with the largest AB, ΔDCAC. However, when two or more ports correspond to one room, the detection errors are all set to the initial state (A port is room A, B port is room B, and C port is room C).

Further, the control unit 8 of the outdoor unit 50 performs transmission via each of the indoor units 5A, 5B, 5C and the signal wiring 15 and detects a transmission failure. When one of the rooms has a poor transmission and one of the A, B, and C ports is undecided, the undecided room is associated with the undecided port. In addition, when the above-mentioned two rooms have poor transmission and any two of the A, B, and C ports are unconfirmed, the two uncommitted connection rooms are not confirmed in order from the A port side. Correspond the room from room A side. If the number of rooms with poor transmission does not match the number of ports with undecided connection rooms among the A, B, and C ports, all are in the initial state (A port is A room, B port is B room, C port is Room C).

Further, the outdoor unit 50 is provided with display LEDs 1, 2, and 3 (not shown) corresponding to the A, B, and C rooms, respectively, to correspond to the room determined during the above-described unconnected detection processing. LE to do
Turn on one of D1, 2, and 3 for about 3 seconds. At this time, for a transmission failure or unconnected room, one of the display unit LEDs 1, 2, and 3 corresponding to the room is blinked, and the defective room is also displayed. Therefore, the detection result can be easily confirmed by displaying the connection room determined during the detection process. In addition, when the forced operation is performed after all the connected rooms are determined, one of the display LEDs 1, 2, and 3 corresponding to the room in operation is turned on to display the room in the forced operation.

In this way, after the installation work of the multi-type air conditioner and the like, the compressor 1 is started and at the same time one of the motor-operated valves 4A, 4B, 4C is opened in order to prohibit the unconnection detection. When the low-pressure switch 7 does not operate after the timer time of the timers TK1A, TK1B, TK1C has elapsed, the indoor units 5A, 5B, 5C and the outdoor unit 5 corresponding to the opened motor operated valves 4A, 4B, 4C are opened.
0 is correctly connected through the refrigerant pipes 11 and 12, while the low-pressure switch 7 operates, the indoor units 5A, 5B, 5C and the outdoor units corresponding to the open electric valves 4A, 4B, 4C It is determined that the refrigerant pipes 11 and 12 with the machine 50 are not connected. Therefore, the outdoor unit 50 and each indoor unit 5
It is possible to determine whether or not the refrigerant pipes 11 and 12 connecting A, 5B and 5C are connected. In addition, the indoor unit 5A to be connected,
When 5B and 5C are not connected, the low-voltage switch 7 promptly detects the disconnection, so that the compressor 1 can be prevented from entering the pump-down state.

Further, the connection discriminating unit 8a of the control unit 8 of the outdoor unit 50 uses the integrated value ΔDC integrated by the temperature difference integrating unit 8b.
By determining whether or not AA, ΔDCAB, ΔDCAC are greater than or equal to a predetermined value ΔDC1, the outdoor unit 50 and each indoor unit 5A,
It is possible to determine whether or not the refrigerant pipes 11 and 12 connecting the 5B and 5C and the signal wiring 15 are correctly connected to each other. The initial values of the temperatures DCA, DCB, DCC of the indoor heat exchanger 51 of the indoor units 5A, 5B, 5C and the temperature DC
Even if the temperature difference between A, DCB, and DCC is small, the integrated values ΔDCAA, ΔDCAB, and ΔDCAC are large, so
The accuracy of detecting the connection state between the outdoor unit 50 and the indoor units 5A, 5B, 5C can be improved. Further, since the integrated value based on the temperature difference becomes faster than the case where the connection state is simply detected by using the temperature difference, the outdoor unit can be operated even when the temperature change of the indoor heat exchanger 51 is gentle. It is possible to shorten the detection time of the connection state between the indoor unit 50 and each indoor unit 5A, 5B, 5C.

The fan control section 8c of the control section 8 of the outdoor unit 50 starts the compressor 1 by the control section 8 and sequentially opens only one of the motor-operated valves 4A, 4B, 4C. , The fan 5 provided in each of the indoor units 5A, 5B, 5C
Turn 5 to start blowing. Then, the fan control unit 8c determines the temperature difference between the temperatures DCA, DCB and DCC of the indoor heat exchanger 51 and the initial values of the temperatures DCA, DCB and DCC of the indoor heat exchangers 51 of the indoor units 5A, 5B and 5C. The temperature difference integrating section 8b
All the fans 55 of the indoor units 5A, 5B, and 5C are stopped within the timer time of the connected room detection timer TK3 that is accumulated by.
Therefore, while the temperature difference integration unit 8b integrates the temperature difference, the heat exchange of the indoor heat exchanger 51 of the indoor units 5A, 5B, 5C is hardly performed, and the temperature DCA of the indoor heat exchanger 51,
DCB and DCC are lower than when the fan 55 is rotating. Therefore, the temperature D of the indoor heat exchanger 51
Initial value of CA, DCB, DCC and temperature DCA, DCB, DC
As the temperature difference from C increases, the integrated value ΔDCAA,
ΔDCAB and ΔDCAC also increased, and the above outdoor unit 5
It is possible to further improve the detection accuracy of the connection state between 0 and each indoor unit 5A, 5B, 5C.

In the above embodiment, the three indoor units 5A, 5B, 5C were connected to the outdoor unit 50, but the number of indoor units is not limited to this, and it goes without saying that two or more indoor units may be connected. is there.

Further, in the above embodiment, the control unit 8 as the control unit of the outdoor unit 50 has the connection determination unit 8a as the connection determination unit, the temperature difference integration unit 8b as the temperature difference integration unit, and the fan as the fan control unit. Although the control unit 8c is provided,
Connection determination means, temperature difference integration means, and fan control means may be provided separately from the control means.

Although the low-voltage switch 7 is used in the above embodiment, a pressure sensor may be used instead of the low-voltage switch.

[0049]

As is apparent from the above, the multi-type air conditioner according to the invention of claim 1 is provided with a compressor, an outdoor heat exchanger connected to the compressor, and a refrigerant pipe in the outdoor heat exchanger. An outdoor unit having a plurality of electrically operated valves, one end of which is connected via a plurality of electrically operated valves, and a control unit which controls the opening and closing of the plurality of electrically operated valves while controlling the compressor, and a refrigerant pipe at the other end of the plurality of electrically operated valves of the outdoor unit. In a multi-type air conditioner having a plurality of indoor units having indoor heat exchangers, one end of which is connected to each other via a refrigerant pipe and the other end of which is connected to the compressor, A low-pressure switch that operates when the refrigerant pressure is equal to or lower than a predetermined value is provided, and the connection determination means controls the control means to open only one of the motor-operated valves, and the low pressure after a predetermined time has elapsed after starting the compressor. If the switch does not operate While determining that the indoor unit and the outdoor unit are properly connected, when the low-pressure switch operates, it is determined that the indoor unit and the outdoor unit corresponding to the opened electric valve are not connected. Is.

Therefore, according to the multi-type air conditioner of the first aspect of the invention, it can be determined whether or not the outdoor unit and each indoor unit are connected. Further, by using the low-pressure switch, as compared to detecting the temperature drop of the refrigerant pipe, it is possible to quickly detect the disconnection, so if there is an outdoor unit and an indoor unit not connected, pump down the compressor. Can be prevented.

In the multi-type air conditioner of the present invention as defined in claim 2, the compressor, the outdoor heat exchanger connected to the compressor, and the refrigerant pipe branched to the outdoor heat exchanger are connected to one end. An outdoor unit having a plurality of electrically operated valves connected to each other and a control means for controlling the compressor and controlling the opening and closing of the plurality of electrically operated valves; and a refrigerant at the other end of the plurality of electrically operated valves of the outdoor unit. A plurality of indoor units each having an indoor heat exchanger, one end of which is respectively connected via a pipe and the other end of which is connected to the compressor through a refrigerant pipe; and the plurality of indoor units are connected to the outdoor unit. In a multi-type air conditioner equipped with signal wiring, a plurality of indoor units are provided with temperature sensors for detecting the temperature of the indoor heat exchanger, and the temperature difference integrating means is provided for each indoor unit with the indoor heat detected by the temperature sensor. Room where the initial temperature of the exchanger and the temperature sensor detected The integrated value obtained by integrating the temperature difference with the temperature of the heat exchanger for a predetermined period is obtained, and the connection determining means determines that the opened electric valve and the indoor unit corresponding to the electric valve are correctly connected. In this case, when the integrated value corresponding to the indoor unit among the integrated values integrated by the temperature difference integrating means is equal to or more than a predetermined value, it is determined that the signal wiring between the outdoor unit and the indoor unit is properly connected. When the integrated value is less than the predetermined value, it is determined that the signal wiring between the outdoor unit and the indoor unit is not connected.

Therefore, according to the multi-type air conditioner of the second aspect of the present invention, it can be determined whether or not the signal wiring connecting the outdoor unit and each indoor unit is properly connected. Even if the temperature difference is small, the integrated value can be increased to improve the accuracy of detecting the connection state of the signal wiring between the outdoor unit and the indoor unit. Further, since the integrated value of the temperature difference is larger due to the temperature difference, the time for detecting the signal wiring connection state between the outdoor unit and the indoor unit can be shortened.

Further, the multi-type air conditioner of the third aspect of the present invention has one end through a compressor, an outdoor heat exchanger connected to the compressor, and a refrigerant pipe branched to the outdoor heat exchanger. An outdoor unit having a plurality of electrically operated valves connected to each other and a control means for controlling the compressor and controlling the opening and closing of the plurality of electrically operated valves; and a refrigerant at the other end of the plurality of electrically operated valves of the outdoor unit. A plurality of indoor units each having an indoor heat exchanger, one end of which is respectively connected via a pipe and the other end of which is connected to the compressor through a refrigerant pipe; and the plurality of indoor units are connected to the outdoor unit. In a multi-type air conditioner equipped with signal wiring, a low-pressure switch that operates when the refrigerant pressure on the suction side of the compressor is below a predetermined value is provided, and a temperature sensor that detects the temperature of the indoor heat exchanger in a plurality of indoor units The temperature difference integrating means is provided for each indoor unit. Temperature sensor detects the temperature difference between the initial temperature of the indoor heat exchanger detected by the temperature sensor and the temperature of the indoor heat exchanger detected by the temperature sensor for a predetermined period of time. If only one of the multiple motorized valves is opened and the low pressure switch does not operate after a specified time has elapsed after starting the compressor, the indoor unit and outdoor unit corresponding to the opened motorized valve are When the low pressure switch operates while determining that they are connected, it is determined that the indoor unit and the outdoor unit corresponding to the opened electric valve are not connected, and the opened electric valve and its electric When it is determined that the indoor unit corresponding to the valve is correctly connected, when the integrated value corresponding to the indoor unit among the integrated values integrated by the temperature difference integrating means is a predetermined value or more, the outdoor unit and the indoor unit Signal wiring to the machine While determined to have been properly connected, when the cumulative value is less than the predetermined value, the signal wiring between the outdoor unit and the indoor unit is to determine that the unconnected.

Therefore, according to the multi-type air conditioner of the third aspect of the present invention, it is possible to determine whether the refrigerant pipes connecting the outdoor unit and the indoor units and the signal wirings are correctly connected. Further, by using the low-pressure switch, as compared to detecting the temperature drop of the refrigerant pipe, it is possible to quickly detect the disconnection, so if there is an outdoor unit and an indoor unit not connected, pump down the compressor. Can be prevented. Even if the temperature difference is small, the integrated value can be increased to improve the accuracy of detecting the connection state between the outdoor unit and the indoor unit. Further, since the integrated value of the temperature difference is larger due to the temperature difference, the time for detecting the connection state between the outdoor unit and the indoor unit can be shortened.

According to a fourth aspect of the present invention, there is provided the multi-type air conditioner according to the second or third aspect, wherein the fan control means includes the indoor heat detected by the temperature sensor by the temperature difference integrating means. While integrating the temperature difference between the initial value of the temperature of the exchanger and the temperature of the indoor heat exchanger detected by the temperature sensor, the fans of the plurality of indoor units are stopped.

Therefore, according to the multi-type air conditioner of the invention of claim 4, the temperature difference between the initial value of the temperature of the indoor heat exchanger and the temperature of the indoor heat exchanger becomes large, and integration is performed according to the temperature difference. Since the value becomes large, it is possible to reliably detect the connection state of the signal wiring between the outdoor unit and the indoor unit.

[Brief description of drawings]

FIG. 1 is a circuit diagram of a multi-type air conditioner according to an embodiment of the present invention.

FIG. 2 is a diagram showing an operation of each part of the multi-type air conditioner.

FIG. 3 is a flowchart showing an operation of a non-connection detection process of a control unit of the outdoor unit of the multi-type air conditioner.

FIG. 4 is a flowchart showing an operation of a non-connection detection process of a control unit of the outdoor unit of the multi-type air conditioner.

FIG. 5 is a flowchart showing an operation of a non-connection detection process of the control unit of the outdoor unit of the multi-type air conditioner.

FIG. 6 is a diagram showing a manner of associating a refrigerant pipe and a signal wiring of the multi-type air conditioner.

FIG. 7 is a circuit diagram of a conventional multi-type air conditioner.

[Explanation of symbols]

1 ... Compressor, 2 ... Four-way valve, 3 ... Outdoor heat exchanger, 4A, 4B,
4C ... motorized valve, 5A, 5B, 5C ... indoor unit, 6 ... accumulator, 7 ... low pressure switch, 8 ... control unit, 8a ... connection discriminating unit, 8b ... temperature difference integrating unit, 8c ... fan control unit, 9 ... defrost Solenoid valve, 50 ... Outdoor unit, 51 ... Indoor heat exchanger,
52 ... Temperature sensor, 53 ... Temperature sensor, 54 ... Temperature sensor, 55 ... Fan.

Claims (4)

[Claims] 1. A compressor (1), an outdoor heat exchanger (3) connected to the compressor (1), and a refrigerant pipe (10A, 10B,) branching to the outdoor heat exchanger (3). 10C) and a plurality of electrically operated valves (4A, 4B, 4C) whose one ends are connected to each other, and the plurality of electrically operated valves (4A, 4B, 4C) for controlling the compressor (1).
An outdoor unit (5) having a control means (8) for controlling opening and closing of (C).
0) and the plurality of motor-operated valves (4A, 4B,
4C) one end is connected to the other end via a refrigerant pipe (11), and the other end is connected to the compressor (1) via a refrigerant pipe (13A, 13B, 13C) to the indoor heat exchanger ( 51) In a multi-type air conditioner having a plurality of indoor units (5A, 5B, 5C) each having a low pressure switch () operated when the refrigerant pressure on the suction side of the compressor (1) is below a predetermined value. 7) and the control means (8) opens only one of the plurality of motor-operated valves (4A, 4B, 4C), and after starting the compressor (1), after a predetermined time elapses. When the low pressure switch (7) does not operate, it is determined that the indoor unit (5A, 5B, 5C) corresponding to the opened motor operated valve (4A, 4B, 4C) and the outdoor unit (50) are properly connected. While judging, the above low-voltage switch
When (7) operates, the open motorized valve (4A, 4B, 4C) above
Corresponding to the indoor unit (5A, 5B, 5C) and the outdoor unit (5
0) and a connection discriminating means (8a) for discriminating that they are not connected to each other. 2. A compressor (1), an outdoor heat exchanger (3) connected to the compressor (1), and a refrigerant pipe (10A, 10B, branching to the outdoor heat exchanger (3). 10C) and a plurality of electrically operated valves (4A, 4B, 4C) whose one ends are connected to each other, and the plurality of electrically operated valves (4A, 4B, 4C) for controlling the compressor (1).
An outdoor unit (5) having a control means (8) for controlling opening and closing of (C).
0) and the plurality of motor-operated valves (4A, 4B,
4C) one end is connected to the other end via a refrigerant pipe (11), and the other end is connected to the compressor (1) via a refrigerant pipe (13A, 13B, 13C) to the indoor heat exchanger ( 51) each having a plurality of indoor units (5A, 5B, 5C), and the plurality of indoor units (5
Signal wiring (1) that connects A, 5B, 5C) to the outdoor unit (50)
And a temperature sensor (52) provided in the plurality of indoor units (5A, 5B, 5C) for detecting the temperature of the indoor heat exchanger (51), and For each of the plurality of indoor units (5A, 5B, 5C), the initial value of the temperature of the indoor heat exchanger (51) detected by the temperature sensor (52) and the indoor heat exchanger (detected by the temperature sensor (52) ( 5
1) Temperature difference integrating means (8b) for obtaining integrated values obtained by integrating the temperature difference with the temperature for a predetermined period (TK3), and the room among the integrated values integrated by the temperature difference integrating means (8b) When the integrated value corresponding to the unit (5A, 5B, 5C) is greater than or equal to a predetermined value, the outdoor unit (50) and the indoor unit (5A, 5B,
5C) and the signal wiring (15) is correctly connected, while the integrated value is less than the predetermined value, the outdoor unit (50) and the indoor unit (5A, 5B, 5C) Connection discriminating means for discriminating that the above-mentioned signal wiring (15) is not connected
A multi-type air conditioner comprising (8a). 3. A compressor (1), an outdoor heat exchanger (3) connected to the compressor (1), and a refrigerant pipe (10A, 10B, branching to the outdoor heat exchanger (3). 10C) and a plurality of electrically operated valves (4A, 4B, 4C) whose one ends are connected to each other, and the plurality of electrically operated valves (4A, 4B, 4C) for controlling the compressor (1).
An outdoor unit (5) having a control means (8) for controlling opening and closing of (C).
0) and the plurality of motor-operated valves (4A, 4B,
4C) one end is connected to the other end via a refrigerant pipe (11), and the other end is connected to the compressor (1) via a refrigerant pipe (13A, 13B, 13C) to the indoor heat exchanger ( 51) each having a plurality of indoor units (5A, 5B, 5C), and the plurality of indoor units (5
Signal wiring (1) that connects A, 5B, 5C) to the outdoor unit (50)
And a plurality of indoor units (5A, 5B, 5A, 5B, 5), 5), a low pressure switch (7) that operates when the refrigerant pressure on the suction side of the compressor (1) is below a predetermined value. 5C) for detecting the temperature of the indoor heat exchanger (51) and the temperature sensor (52) for each of the plurality of indoor units (5A, 5B, 5C). The initial value of the temperature of the indoor heat exchanger (51) and the indoor heat exchanger (5 detected by the temperature sensor (52).
The temperature difference integrating means (8b) for obtaining integrated values of the temperature difference from the temperature of 1) for a predetermined period (TK3) and the control means (8) include the plurality of electric valves (4A, 4B, 4C). If the low pressure switch (7) does not operate after a predetermined time elapses after opening only one of the above and starting the compressor (1), the opened electric valve (4A, 4B, 4C) While determining that the indoor unit (5A, 5B, 5C) corresponding to the above and the outdoor unit (50) are correctly connected, the low-voltage switch
When (7) operates, the open motorized valve (4A, 4B, 4C) above
Corresponding to the indoor unit (5A, 5B, 5C) and the outdoor unit (5
0) is not connected and the indoor unit out of the integrated value integrated by the temperature difference integrating means (8b).
When the integrated value corresponding to (5A, 5B, 5C) is greater than or equal to the specified value,
While determining that the signal wiring (15) between the outdoor unit (50) and the indoor units (5A, 5B, 5C) is correctly connected, while the integrated value is less than the predetermined value, the outdoor unit
The signal wiring (1) between the (50) and the indoor unit (5A, 5B, 5C)
A multi-type air conditioner comprising: a connection determining means (8a) for determining that 5) is not connected. 4. The multi-type air conditioner according to claim 2, wherein the temperature difference integrating means (8b) detects the initial value of the temperature of the indoor heat exchanger (51) detected by the temperature sensor (52). And a fan that stops the fan (55) of the plurality of indoor units (5A, 5B, 5C) while integrating the temperature difference between the temperature of the indoor heat exchanger (51) detected by the temperature sensor (52) and the temperature of the indoor heat exchanger (51). A multi-type air conditioner comprising a control means (8c).