JP2018123991A - Air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air conditioner capable of determining whether a connection of refrigerant piping or a connection of wiring is correctly made without reference to a difference in heat exchange quantity of an indoor heat exchanger of each indoor unit.SOLUTION: A CPU 210 fully opens only an expansion valve 100a corresponding to an indoor unit 5a after taking in and storing a before-determination heat exchange temperature TBE of each indoor unit, and also drives an indoor fan 54a at a determination-time face rotating speed Rf=Rfd extracted by referring to a piping/wiring connection table 400. Then the CPU 210 takes in an after-full-opening heat exchange temperature TAFa from the indoor unit 5a a predetermined time tp after the indoor fan 54a is actuated at the determination-time fan rotating speed Rfd, and then determines whether the temperature difference obtained by subtracting the after-full-opening heat exchange temperature TAFa from the before-determination heat exchange temperature TBEa is equal to or larger than a threshold temperature difference Tth. The CPU 210 makes a correct/incorrect determination OK when the temperature difference is equal to or larger than the threshold temperature difference Tth or a correct/incorrect determination NG when the temperature difference is smaller than the threshold temperature difference Tth.SELECTED DRAWING: Figure 4

Description

  The present invention relates to an air conditioner in which an outdoor unit and a plurality of indoor units are connected by a refrigerant pipe.

  An air conditioner composed of one outdoor unit and a plurality of indoor units is connected to the outdoor unit and each indoor unit by a refrigerant pipe composed of a liquid pipe having a gas pipe and an expansion valve. Each indoor unit and each expansion valve are connected to each other by wiring. In such an air conditioner, it is necessary to check whether or not the connection of the refrigerant pipe or the connection of the wiring is correct after installation.

  Patent Document 1 discloses a multi-type air conditioner in which one outdoor unit and at least two indoor units are connected by a refrigerant pipe or wiring consisting of a liquid pipe having a gas pipe and an expansion valve. A method for determining whether or not the connection or the wiring connection is correct is disclosed. Specifically, in the correctness determination at the time of cooling operation, all the liquid temperatures and each indoor unit are installed after a certain time has elapsed since all the expansion valves except one of the expansion valves are fully closed. All room temperatures in the room are detected, and the temperature difference between the room temperature and the liquid temperature in each indoor unit is calculated. Since the liquid temperature of the indoor unit corresponding to the expansion valve that is not fully closed is lower than the room temperature, the temperature difference between the room temperature and the liquid temperature in the indoor unit becomes large. Therefore, by checking whether the indoor unit with the largest temperature difference between the room temperature and the liquid temperature corresponds to an expansion valve that is fully closed, the connection of either the refrigerant pipe or the wiring is It can be determined whether it is wrong.

  On the other hand, in the correctness / incorrectness determination during the heating operation, first, after all the expansion valves are opened and the refrigeration cycle is stabilized, the indoor heat exchanger temperature (hereinafter referred to as heat exchange temperature) of each indoor unit is detected. Thereafter, only one of the expansion valves is fully closed, and after a certain period of time, all the heat exchange temperatures are detected, and heat exchange in each indoor unit before and after only one of the expansion valves is fully closed. Each temperature difference is calculated. In the indoor unit corresponding to the expansion valve that is fully closed, the heat exchange temperature decreases. Therefore, by confirming whether the indoor unit with the largest temperature difference between the heat exchange temperatures before and after only one expansion valve is fully closed corresponds to the expansion valve that is fully closed. It can be determined whether or not any one of the refrigerant pipe and the wiring is wrongly connected.

JP 2012-17886 A

  In the multi-type air conditioner described in Patent Document 1, during the heating operation, whether or not the refrigerant pipes are connected or the wirings are connected is determined based on the change in the heat exchange temperature. At this time, the indoor heat exchanger is larger than other indoor heat exchangers, and the size of the indoor heat exchanger is the same as other indoor units, but the refrigerant pipe connected to the outdoor unit is different from the other indoor units. Compared to other indoor units, indoor heat exchangers are longer indoor units, for example, indoor units that are connected by refrigerant pipes that are four times longer than the shortest refrigerant pipe (for example, 5 m). Since there is little heat exchange amount (the amount of heat exchanged between the refrigerant and room air per unit time), the change in heat exchange temperature after the expansion valve is fully closed becomes slow.

  In the air conditioner in which there is an indoor unit with a small amount of heat exchange as compared with other indoor units as described above, whether the refrigerant pipe connection or the wiring connection in the heating operation described in Patent Document 1 is correct or incorrect is determined. When the temperature difference in the heat exchange temperature before and after closing the expansion valves in all the indoor units is fully closed with the expansion valve corresponding to the indoor unit having a small heat exchange amount being detected, the temperature difference in the indoor unit is small. There is a possibility that a large difference from a temperature difference in other indoor units does not occur, and there is a possibility that correctness / incorrectness determination of refrigerant pipe connection or wiring connection cannot be performed.

  The present invention solves the above-described problems, and is an air conditioner that can determine whether a refrigerant pipe is connected or a wiring is connected correctly regardless of a difference in heat exchange amount in an indoor heat exchanger of each indoor unit. The purpose is to provide.

  In order to solve the above problems, an air conditioner of the present invention includes an outdoor unit, a plurality of indoor units, a number of flow rate adjusting units corresponding to the number of the plurality of indoor units, and a control unit. . The outdoor unit and the plurality of indoor units and the flow rate adjusting means are connected by refrigerant piping, the outdoor unit and the plurality of indoor units are connected by the indoor unit wiring, and the outdoor unit and the flow rate adjusting means are connected by the flow rate adjusting means wiring. . The plurality of indoor units have an indoor heat exchanger, an indoor fan, and a heat exchange temperature detecting means for detecting a heat exchange temperature that is the temperature of the indoor heat exchanger.

  When the heat exchange amount in the indoor heat exchanger of at least one indoor unit is different from the heat exchange amount of the indoor heat exchanger in another indoor unit, the control means is configured to connect the refrigerant pipe, the indoor unit wiring, and the flow rate adjusting unit wiring. When performing correct / incorrect determination to determine whether the connection is correct or not, all the flow rate adjusting means are opened to perform heating operation, and the pre-determination heat exchange temperature that is the heat exchange temperature of each indoor heat exchanger after the heating operation state is stabilized. To detect. In addition, after detecting the pre-determination heat exchange temperature, the control unit closes one specific flow rate adjusting unit and sets the indoor fan of the indoor unit corresponding to the flow rate adjusting unit to the heat of the indoor heat exchanger of the indoor unit. When a predetermined time has elapsed after driving with the fan speed at the time of determination, which is the speed corresponding to the exchange amount, the total heat exchange temperature of the indoor heat exchanger of the indoor unit corresponding to the fully closed flow rate adjusting means The heat exchange temperature is detected after closing. The control means has a predetermined temperature difference obtained by subtracting the post-closed heat exchanger temperature from the pre-determined heat exchanger temperature of the indoor unit corresponding to the flow rate adjusting means that is fully closed among the plurality of pre-determined heat exchanger temperatures. If the temperature difference is not less than the threshold temperature difference, the refrigerant pipe, the indoor unit wiring, and the flow rate adjusting means wiring are correctly connected. It is determined that any one connection is incorrect.

  The air conditioner of the present invention configured as described above performs the correctness / incorrectness determination of refrigerant pipe connection or wiring connection as the air volume by the indoor fan according to the heat exchange amount in the indoor heat exchanger of each indoor unit. Regardless of the amount of heat exchange in the heat exchanger, it is possible to determine whether the refrigerant pipe connection or the wiring connection is correct.

It is explanatory drawing of the air conditioning apparatus which is embodiment of this invention, (A) is a refrigerant circuit figure, (B) is a block diagram which shows the wiring connection of an outdoor unit control means and each indoor unit. It is a determination time indoor fan rotation speed table in the embodiment of the present invention. It is a piping and wiring connection determination table in the embodiment of the present invention. It is a flowchart which shows the process in connection with the correctness determination of the connection of piping and wiring at the time of heating operation in embodiment of this invention.

  Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. As an embodiment, an explanation will be given by taking as an example an air conditioner in which three indoor units are connected in parallel to one outdoor unit by refrigerant piping and wiring, and all the indoor units can simultaneously perform a cooling operation or a heating operation. . The present invention is not limited to the following embodiments, and can be variously modified without departing from the gist of the present invention.

  As shown in FIG. 1 (A), the air conditioner 1 in the present embodiment includes one outdoor unit 2 having three liquid side shutoff valves 26a to 26c and three gas side shutoff valves 27a to 27c. It has an expansion valve box 100 including a total of three indoor units of three indoor units 5a to 5c and three expansion valves 100a to 100c. Although details will be described later, the heat exchange amounts in the indoor heat exchangers of the indoor units 5a to 5c are different, the heat exchange amount of the indoor unit 5c is the smallest, and the heat exchange amount of the indoor unit 5b is the largest. And the heat exchange amount of the indoor unit 5a is the amount between the indoor unit 5b and the indoor unit 5c. The outdoor unit 2, the indoor units 5a to 5c, and the expansion valve box 100 are refrigerant pipes including three liquid pipes 8a, 8b, 8c and three gas pipes 9a, 9b, 9c, and the first wiring. The first branch wirings 250aa to 250ac, the second wiring 250b, and the second branch wirings 250ba to 250bc are connected in parallel.

  Specifically, one end of the liquid pipe 8a is connected to the liquid pipe connection part 52a of the indoor unit 5a, and the other end of the liquid pipe 8a is connected to the liquid side closing valve 26a of the outdoor unit 2. One end of the liquid pipe 8b is connected to the liquid pipe connecting portion 52b of the indoor unit 5b, and the other end of the liquid pipe 8b is connected to the liquid side closing valve 26b of the outdoor unit 2. One end of the liquid pipe 8c is connected to the liquid pipe connection portion 52c of the indoor unit 5c, and the other end of the liquid pipe 8c is connected to the liquid side closing valve 26c of the outdoor unit 2. The expansion valve 100a of the expansion valve box 100 is provided in the liquid pipe 8a, the expansion valve 100b is provided in the liquid pipe 8b, and the expansion valve 100c is provided in the liquid pipe 8c.

  One end of the gas pipe 9a is connected to the gas pipe connection part 53a of the indoor unit 5a, and the other end of the gas pipe 9a is connected to the gas side closing valve 27a of the outdoor unit 2. Further, one end of the gas pipe 9b is connected to the gas pipe connection part 53b of the indoor unit 5b, and the other end of the gas pipe 9b is connected to the gas side closing valve 27b of the outdoor unit 2. One end of the gas pipe 9c is connected to the gas pipe connection portion 53c of the indoor unit 5c, and the other end of the gas pipe 9c is connected to the gas side closing valve 27c of the outdoor unit 2.

  As described above, the indoor units 5a to 5c are connected to the outdoor unit 2 by the liquid pipes 8a to 8c provided with the expansion valves 100a to 100c and the gas pipes 9a to 9c, respectively, and the refrigerant circuit of the air conditioner 1 10 is configured.

  One end of the first wiring 250a is connected to the communication unit 230 of the outdoor unit control means 200 of the outdoor unit 2 described later, and the other end of the first wiring 250a is connected to one end of each of the first branch wirings 250aa to 250ac. ing. The other end of the first branch wiring 250aa is the control means (not shown) of the indoor unit 5a, the other end of the first branch wiring 250ab is the control means (not shown) of the indoor unit 5b, and the other end of the first branch wiring 250ac is the room. It is connected to control means (not shown) of the machine 5c. The first wiring 250a and the first branch wirings 250aa to 250ac are the indoor unit wiring of the present invention.

One end of the second wiring 250b is connected to the communication unit 230 of the outdoor unit control means 200, and the other end of the second wiring 250b is connected to one end of each of the second branch wirings 250ba to 250bc. The other end of the second branch wiring 250ba is connected to the expansion valve 100a, the other end of the second branch wiring 250bb is connected to the expansion valve 100b, and the other end of the second branch wiring 250bc is connected to the expansion valve 100c. The second wiring 250b and the second branch wirings 250ba to 250bc are the expansion valve box wiring of the present invention.
<Configuration of outdoor unit 2>

  First, the outdoor unit 2 will be described. The outdoor unit 2 includes a compressor 21, a four-way valve 22, an outdoor heat exchanger 23, three expansion valves 24a to 24c, an accumulator 24, an outdoor fan 25, and the three liquid-side closing valves described above. 26a to 26c, three gas side closing valves 27a to 27c, and an outdoor unit control means 200. And these each apparatus except the outdoor fan 25 and the outdoor unit control means 200 are mutually connected by each refrigerant | coolant piping explained in full detail below, and the outdoor unit refrigerant circuit 20 which makes a part of refrigerant circuit 10 is comprised. Yes.

  The compressor 21 is a variable capacity compressor that can be driven with a motor (not shown) whose rotation speed is controlled by an inverter to vary the driving capacity. A refrigerant discharge port of the compressor 21 and a port a of the four-way valve 22 are connected by a discharge pipe 41. The refrigerant suction side of the compressor 21 and the refrigerant outlet side of the accumulator 24 are connected by a suction pipe 42.

  The four-way valve 22 is a valve for switching the direction in which the refrigerant flows, and includes four ports a, b, c, and d. As described above, the port a and the refrigerant discharge port of the compressor 21 are connected by the discharge pipe 41. The refrigerant outlet 43 is connected to the port b and one refrigerant inlet / outlet of the outdoor heat exchanger 23. The port c and the refrigerant inflow side of the accumulator 24 are connected by a refrigerant pipe 46. One end of the outdoor unit gas pipe 45 is connected to the port d.

  One end of each of the three outdoor unit gas distribution pipes 45 a to 45 c is connected to the other end of the outdoor unit gas pipe 45. The other end of the outdoor unit gas distribution pipe 45a is connected to the gas-side closing valve 27a. The other end of the outdoor unit gas distribution pipe 45b is connected to the gas side shut-off valve 27b. The other end of the outdoor unit gas distribution pipe 45c is connected to the gas side closing valve 27c.

  The outdoor heat exchanger 23 exchanges heat between the outside air taken into the outdoor unit 2 from the suction port (not shown) and the refrigerant by the rotation of the outdoor fan 25. As described above, one refrigerant inlet / outlet of the outdoor heat exchanger 23 and the port b of the four-way valve 22 are connected by the refrigerant pipe 43. One end of the outdoor unit liquid pipe 44 is connected to the other refrigerant inlet / outlet of the outdoor heat exchanger 23. The outdoor heat exchanger 23 functions as a condenser when the refrigerant circuit 10 is in a cooling cycle, and functions as an evaporator when the refrigerant circuit 10 is in a heating cycle.

  One end of each of the three outdoor unit liquid distribution tubes 44 a to 44 c is connected to the other end of the outdoor unit liquid tube 44. The other end of the outdoor unit liquid distribution pipe 44a is connected to the liquid side closing valve 26a. The other end of the outdoor unit liquid distribution pipe 44b is connected to the liquid side closing valve 26b. The other end of the outdoor unit liquid distribution pipe 44c is connected to the liquid side closing valve 26c.

  As described above, in the accumulator 24, the refrigerant inflow side and the port c of the four-way valve 22 are connected by the refrigerant pipe 46, and the refrigerant outflow side and the refrigerant suction port of the compressor 21 are connected by the suction pipe 42. The accumulator 24 separates the inflowing refrigerant into a gas refrigerant and a liquid refrigerant and causes the compressor 21 to suck only the gas refrigerant through the suction pipe 42.

  The outdoor fan 25 is a propeller fan formed of a resin material disposed in the vicinity of the outdoor heat exchanger 23, and the outdoor fan 25 is rotated by a fan motor (not shown) so as to be provided in the outdoor unit 2 (not shown). Outside air is taken into the interior of the outdoor unit 2 from the suction port, and the outside air heat-exchanged with the refrigerant flowing in the outdoor heat exchanger 23 is discharged to the outside of the outdoor unit 2 from a blower outlet (not shown) provided in the outdoor unit 2.

  In addition to the configuration described above, the outdoor unit 2 is provided with various sensors. As shown in FIG. 1A, a discharge pipe 41 includes a high-pressure sensor 31 that detects the pressure of refrigerant discharged from the compressor 21, and a discharge temperature sensor that detects the temperature of refrigerant discharged from the compressor 21. 33 is provided.

  Near the refrigerant inflow side of the accumulator 24 in the refrigerant pipe 46, there are a low pressure sensor 32 that detects the pressure of the refrigerant sucked into the compressor 21 and a suction temperature sensor 34 that detects the temperature of the refrigerant sucked into the compressor 21. Is provided.

  A refrigerant temperature sensor 35 that detects the temperature of the refrigerant flowing into the outdoor heat exchanger 23 when the outdoor heat exchanger 23 functions as an evaporator is provided in the vicinity of the outdoor heat exchanger 23 in the outdoor unit liquid pipe 44. ing. In addition, an outdoor air temperature sensor 38 that detects the temperature of the outside air flowing into the outdoor unit 2, that is, the outside air temperature, is provided near the suction port (not shown) of the outdoor unit 2.

  Between the expansion valve 24a and the liquid side closing valve 26a in the outdoor unit liquid distribution pipe 44a, a liquid side temperature sensor 36a for detecting the temperature of the refrigerant flowing through the outdoor unit liquid distribution pipe 44a is provided. Between the expansion valve 24b and the liquid side closing valve 26b in the outdoor unit liquid distribution pipe 44b, a liquid side temperature sensor 36b for detecting the temperature of the refrigerant flowing through the outdoor unit liquid distribution pipe 44b is provided. Between the expansion valve 24c and the liquid side closing valve 26c in the outdoor unit liquid distribution pipe 44c, a liquid side temperature sensor 36c for detecting the temperature of the refrigerant flowing through the outdoor unit liquid distribution pipe 44c is provided.

  Further, the outdoor unit 2 is provided with an outdoor unit control means 200 which is a control means of the present invention. The outdoor unit control means 200 is mounted on a control board stored in an electrical component box (not shown) of the outdoor unit 2, and as shown in FIG. 1B, a CPU 210, a storage unit 220, a communication unit 230, The sensor input unit 240 is provided.

  The storage unit 220 includes a ROM and a RAM, and includes detection values corresponding to control programs for the outdoor unit 2 and detection signals from various sensors, driving states of the compressor 21 and the outdoor fan 25, the indoor unit 5a and the indoor unit. Operation information (including operation / stop information, set temperature information, etc.) transmitted from 5b and 5c is stored. As described above, the communication unit 230 is connected to the indoor unit 5a to the indoor unit 5c by the first wiring 250a and the first branch wirings 250aa to 250ac, and is connected to the expansion valve by the second wiring 250b and the second branch wirings 250ba to 250bc. The expansion valves 100 a to 100 c of the box 100 are connected. That is, the communication unit 230 communicates with the indoor units 5a to 5c via the first wiring 250a and the first branch wirings 250aa to 250ac, and via the second wiring 250b and the second branch wirings 250ba to 250bc. It is an interface for transmitting a signal to the expansion valve box 100. The sensor input unit 240 captures detection results from various sensors of the outdoor unit 2 and outputs them to the CPU 210.

The CPU 210 fetches detection values from various sensors periodically (for example, every 30 seconds) via the sensor input unit 240, and from the indoor units 5a to 5c via the first wiring 250a and the first branch wirings 250aa to 250ac. A signal including an operation state indicating operation start / stop and operation information (set temperature, indoor temperature, etc.) transmitted via the communication unit 230 is input. The CPU 210 controls the drive of the compressor 21 and the outdoor fan 25 based on the various pieces of input information, and expands the expansion valve 100a of the expansion valve box 100 via the second wiring 250b and the second branch wirings 250ba to 250bc. Adjust the opening of ~ 100c.
<Configuration of expansion valve box 100>

Next, the expansion valve box 100 will be described. The expansion valve box 100 includes three expansion valves 100a to 100c. The expansion valve 100a is provided in the liquid pipe 8a, the expansion valve 100b is provided in the liquid pipe 8b, and the expansion valve 100c is provided in the liquid pipe 8c. Yes. The expansion valve 100a includes a second wiring 250b and a second branch wiring 250ba, the expansion valve 100b includes a second wiring 250b and a second branch wiring 250bb, and the expansion valve 100c includes a second wiring 250b and a second branch wiring 250bc. It is connected to the communication unit 230 of the outdoor unit 2. The expansion valves 100a to 100c are electronic expansion valves driven by a pulse motor (not shown), and the number of pulses given to the pulse motor transmitted from the outdoor unit 2 via the second wiring 250b and the second branch wirings 250ba to 250bc. The amount of refrigerant flowing through each of the indoor units 5a to 5c is adjusted by adjusting the respective opening degrees.
<Configuration of indoor units 5a to 5c>

  Next, the indoor units 5a to 5c will be described. The indoor units 5a to 5c include indoor heat exchangers 51a to 51c, liquid pipe connection parts 52a to 52c, gas pipe connection parts 53a to 53c, and indoor fans 54a to 54c. These constituent devices other than the indoor fans 54 a to 54 c are connected to each other through refrigerant pipes that will be described in detail below, thereby constituting indoor unit refrigerant circuits 50 a to 50 c that form part of the refrigerant circuit 10.

  As described above, the indoor units 5a to 5c have different heat exchange amounts in the indoor heat exchangers 51a to 51c, but the indoor units 5a to 5c all have the same configuration except for the heat exchange amount. In the following description, only the configuration of the indoor unit 5a will be described, and description of the configuration of the indoor units 5b and 5c will be omitted. In FIG. 1A, the numbers assigned to the constituent devices of the indoor unit 5a are changed from “a” to “b” or “c”, respectively, so that the configurations of the indoor units 5b and 5c corresponding to the constituent devices of the indoor unit 5a are obtained. It becomes a device.

The indoor heat exchanger 51a exchanges heat between the refrigerant and indoor air taken into the indoor unit 5a from a suction port (not shown) provided in the indoor unit 5a by rotation of the indoor fan 54a. One refrigerant inlet / outlet of the indoor heat exchanger 51a and the liquid pipe connecting portion 52a are connected by an indoor unit liquid pipe 71a. The other refrigerant inlet / outlet of the indoor heat exchanger 51a and the gas pipe connecting portion 53a are connected by an indoor unit gas pipe 72a. Each refrigerant pipe is connected to the liquid pipe connecting part 52a and the gas pipe connecting part 53a by welding, a flare nut or the like.
The indoor heat exchanger 51a functions as an evaporator when the indoor unit 5a performs a cooling operation, and functions as a condenser when the indoor unit 5a performs a heating operation.

  The indoor fan 54a is a cross flow fan formed of a resin material disposed in the vicinity of the indoor heat exchanger 51a, and is rotated by a fan motor (not shown) to enter the indoor unit 5a from the suction port (not shown). Air is taken in and the indoor air heat-exchanged with the refrigerant in the indoor heat exchanger 51a is supplied to the room from an unillustrated air outlet provided in the indoor unit 5a.

  In addition to the configuration described above, the indoor unit 5a is provided with the following sensors. The indoor heat exchanger 51a is provided with a heat exchange temperature sensor 61a that detects the temperature of the indoor heat exchanger 51a, that is, the heat exchange temperature. Also, an indoor temperature sensor 62a for detecting the temperature of indoor air flowing into the indoor unit 5a, that is, the indoor temperature, is provided near the suction port (not shown) of the indoor unit 5a.

  Moreover, although illustration and detailed description are abbreviate | omitted, the indoor unit 5a is provided with the indoor unit control means. The indoor unit control means includes a CPU, a storage unit, a communication unit, and a sensor input unit. The storage unit includes a ROM and a RAM, and stores a control program for the indoor unit 5a, detection values corresponding to detection signals from various sensors, a control state of the indoor fan 54a, and the like. The communication unit is connected to the communication unit 230 of the outdoor unit 2 through the first wiring 250a and the first branch wiring 250aa, and communicates with the outdoor unit 2 through the first wiring 250a and the first branch wiring 250aa. Interface.

The sensor input unit captures detection results of various sensors of the indoor unit 5a and outputs them to the CPU. The CPU takes in the detection result of each sensor of the indoor unit 5a described above via the sensor input unit. In addition, the CPU captures a signal related to control transmitted from the outdoor unit 2 via the communication unit, the first wiring 250a, and the first branch wiring 250aa. Further, the CPU performs drive control of the indoor fan 54a based on the acquired detection result and control signal. Further, the CPU calculates a temperature difference between the set temperature set by the user by operating a remote controller (not shown) and the room temperature detected by the room temperature sensor 62a, and the required capacity based on the calculated temperature difference is transmitted to the communication unit. And transmitted to the outdoor unit control means 200 of the outdoor unit 2 through the first wiring 250a and the first branch wiring 250aa.
<Operation of Refrigerant Circuit 10>

  Next, the flow of the refrigerant and the operation of each part in the refrigerant circuit 10 when the air-conditioning apparatus 1 of the present embodiment performs the air conditioning operation will be described with reference to FIG. In the following description, the case where the indoor units 5a to 5c perform the heating operation will be described, and the detailed description will be omitted when the air conditioner 1 performs the cooling operation. Moreover, the arrow in FIG. 1 (A) has shown the flow of the refrigerant | coolant at the time of the heating operation in the refrigerant circuit 10. FIG.

  When the air conditioner 1 performs the heating operation, the four-way valve 22 is in the state indicated by the solid line in FIG. 1A, that is, the port a and the port d of the four-way valve 22 communicate with each other, and the port b and the port c. Is switched to communicate. Thereby, the refrigerant circuit 10 enters a state in which the refrigerant flows in the direction indicated by the arrow in FIG. 1A, the outdoor heat exchanger 23 functions as an evaporator, and the indoor heat exchangers 51a to 51c each function as a condenser. It becomes a heating cycle.

  When the compressor 21 is started in the state of the refrigerant circuit 10 as described above, the high-pressure refrigerant discharged from the compressor 21 flows into the four-way valve 22 from the discharge pipe 41 and flows through the outdoor unit gas pipe 45 from the four-way valve 22. To the outdoor unit gas distribution pipes 45a to 45c. The refrigerant branched into the outdoor unit gas distribution pipes 45a to 45c flows into the gas pipes 9a to 9c via the gas side closing valves 27a to 27c.

  The refrigerant flowing through the gas pipe 9a flows into the indoor unit 5a through the gas pipe connection part 53a of the indoor unit 5a. The refrigerant flowing into the indoor unit 5a flows through the indoor unit gas pipe 72a, flows into the indoor heat exchanger 51a, and condenses by exchanging heat with the indoor air taken into the indoor unit 5a by the rotation of the indoor fan 54a. To do. Moreover, the refrigerant | coolant which flows through the gas pipe 9b flows in into the indoor unit 5b via the gas pipe connection part 53b of the indoor unit 5b. The refrigerant flowing into the indoor unit 5b flows through the indoor unit gas pipe 72b and flows into the indoor heat exchanger 51b, and condenses by exchanging heat with the indoor air taken into the indoor unit 5b by the rotation of the indoor fan 54b. To do. And the refrigerant | coolant which flows through the gas pipe 9c flows in into the indoor unit 5c via the gas pipe connection part 53c of the indoor unit 5c. The refrigerant flowing into the indoor unit 5c flows through the indoor unit gas pipe 72c and flows into the indoor heat exchanger 51c, and condenses by exchanging heat with the indoor air taken into the indoor unit 5c by the rotation of the indoor fan 54c. To do.

  Thus, the indoor heat exchangers 51a to 51c each function as a condenser, and the indoor air that has exchanged heat with the refrigerant in the indoor heat exchangers 51a to 51c enters the room from the outlets of the indoor units 5a to 5c (not shown). By blowing out, each room in which the indoor units 5a to 5c are installed is heated.

  The refrigerant that has flowed out of the indoor heat exchanger 51a flows through the indoor unit liquid pipe 71a, and flows out to the liquid pipe 8a through the liquid pipe connecting portion 52a. The refrigerant flowing through the liquid pipe 8a is decompressed by the expansion valve 100a, flows into the outdoor unit 2 through the liquid side closing valve 26a, and flows into the outdoor unit liquid distribution pipe 44a from the liquid side closing valve 26a. In addition, the refrigerant that has flowed out of the indoor heat exchanger 51b flows through the indoor unit liquid pipe 71b, and flows out to the liquid pipe 8b through the liquid pipe connecting portion 52b. The refrigerant flowing through the liquid pipe 8b is decompressed by the expansion valve 100b, flows into the outdoor unit 2 through the liquid side closing valve 26b, and flows into the outdoor unit liquid distribution pipe 44b from the liquid side closing valve 26b. And the refrigerant | coolant which flowed out from the indoor heat exchanger 51c flows through the indoor unit liquid pipe 71c, and flows out into the liquid pipe 8c through the liquid pipe connection part 52c. The refrigerant flowing through the liquid pipe 8c is decompressed by the expansion valve 100c, flows into the outdoor unit 2 through the liquid side closing valve 26c, and flows into the outdoor unit liquid distribution pipe 44c from the liquid side closing valve 26c.

  The refrigerant flowing through each of the outdoor unit liquid distribution pipes 44 a to 44 c merges in the outdoor unit liquid pipe 44. The refrigerant merged in the outdoor unit liquid pipe 44 flows through the outdoor unit liquid pipe 44 and flows into the outdoor heat exchanger 23. The refrigerant flowing into the outdoor heat exchanger 23 evaporates by exchanging heat with the outside air taken into the outdoor unit 2 by the rotation of the outdoor fan 25.

  The refrigerant that flows out of the outdoor heat exchanger 23 into the refrigerant pipe 43 flows in the order of the four-way valve 22, the refrigerant pipe 46, the accumulator 28, and the suction pipe 42, and is sucked into the compressor 21 and compressed again.

When the air conditioner 1 performs the cooling operation, the CPU 210 indicates the state where the four-way valve 22 is indicated by a broken line, that is, the port a and the port b of the four-way valve 22 communicate with each other, and the port c and the port d communicate with each other. Switch to Thereby, the refrigerant circuit 100 becomes a cooling cycle in which the outdoor heat exchanger 23 functions as a condenser and the indoor heat exchangers 51a to 51c each function as an evaporator.
<Correcting of refrigerant piping and wiring connections>

  Next, with reference to FIGS. 2 to 4, the refrigerant circuit 10 is used as a heating cycle in the air-conditioning apparatus 1 of the present embodiment, the refrigerant pipes 8 a to 8 c are connected, the wiring 250 is connected, or the wirings 250 a to 250 d. A method for determining whether or not the connection is correct (hereinafter simply referred to as “correction determination” unless otherwise required) will be described. Here, the correct / incorrect determination of the connection means that the outdoor unit 2 and each of the indoor units 5a to 5c have the refrigerant pipes 8a to 8c, the first wiring 250a and the first branch wirings 250aa to 250ac, the first, as shown in FIG. It is to determine whether or not the two wirings 250b and the second branch wirings 250ba to 250bc are connected. In other words, whether or not any one of the refrigerant pipes 8a to 8c, the first wiring 250a and the first branch wirings 250aa to 250ac, the second wiring 250b and the second branch wirings 250ba to 250bc is erroneously connected. It is to judge.

  The specific method of correct / incorrect determination is as follows. When the air conditioner 1 is installed in winter or in a cold region, first, the refrigerant circuit 10 is set to a heating cycle, the compressor 21 is started at a predetermined speed, and the indoor fans 54a to 54c are started at a predetermined speed. The expansion valves 100a to 100c are each set to a predetermined opening to stabilize the refrigerant circuit 10.

  The predetermined rotation speed of the compressor 21 is, for example, the respective condensation temperatures (detectable by the heat exchange temperature sensors 61a to 61c) in the indoor heat exchangers 51a to 51c functioning as condensers at room temperature (the indoor temperature sensor 62a). The number of rotations is a temperature of + 15 ° C. The predetermined number of rotations of the indoor fans 54a to 54c is such that the condensation temperature in the indoor heat exchangers 51a to 51c can be set to room temperature + 15 ° C. and frost formation does not occur in the outdoor heat exchanger 23 functioning as an evaporator. The rotation speed is low. Moreover, the predetermined opening degree of the expansion valves 100a to 100c is, for example, an opening degree intermediate between full opening and full closing. The refrigerant circuit 10 is stabilized when, for example, the condensation temperature reaches room temperature + 15 ° C. and 5 minutes have elapsed.

  If the refrigerant circuit 10 is stabilized, the heat exchange temperature sensors 61a to 61c of the indoor units 5a to 5c at this time detect heat exchange temperatures (hereinafter referred to as pre-judgment heat exchange temperatures), and then the expansion valves 100a to 100c. Any one of them is fully closed, and the indoor fans 54a to 54c of the indoor units 5a to 5c corresponding to the fully closed expansion valves 100a to 100c are determined from the determination-time indoor fan rotation speed table 300 shown in FIG. The extracted number of rotations.

  Here, the determination-time indoor fan rotation speed table 300 is obtained by performing a test or the like in advance and stored in the storage unit 220 of the outdoor unit control means 200, and is connected to the outdoor unit 2 ( The indoor fan rotation speed at the time of correct / incorrect determination (hereinafter referred to as the determination rotation speed Rf (unit: rpm)) is determined in accordance with the heat exchange amount of the indoor unit (assumed to be referred to as the heat exchange amount Ha). It is a thing.

  The heat exchange amount Ha means the amount of heat exchanged between the refrigerant and the room air per unit time in the indoor heat exchanger, and the amount of refrigerant flowing in is the same and the size of the indoor heat exchanger is different. When the indoor heat exchanger has the same size and the length of the refrigerant pipe connected to the outdoor unit is different for each indoor unit, and the amount of refrigerant flowing into each indoor unit is different, the heat exchange amount Ha There is a difference. Therefore, when the amount of refrigerant and the amount of air flowing into each indoor heat exchanger are the same, the indoor heat exchanger with a small heat exchange amount Ha has a heat exchange temperature higher than that of an indoor heat exchanger with a large heat exchange amount Ha. The amount of change per unit time is small.

  Based on the above, the determination-time indoor fan rotation speed table 300 is set so that the determination-time fan rotation speed Rf increases as the heat exchange amount Ha decreases. Specifically, the fan rotation speed Rf at the time of determination when the heat exchange amount Ha is the smallest value A is the largest value Rfa, and the determination is made as the heat exchange amount Ha increases from A → D. The hour fan rotational speed Rf is determined so as to decrease from Rfa → Rfd. The determination fan rotation speeds Rf when the heat exchange amount Ha is larger than the value D are all the same Rfd. This is because, when performing correctness determination, it is known that correctness determination can be performed for indoor units in which the heat exchange amount Ha is greater than D without determining the fan rotation speed Rf during determination to be equal to or greater than Rfd.

  Further, after any of the expansion valves 100a to 100c is fully closed, this state is maintained for a predetermined time (for example, 5 minutes, hereinafter referred to as a predetermined time tp). During the predetermined time tp, in the indoor heat exchangers 51a to 51c corresponding to any of the expansion valves 100a to 100c that are fully closed, the heat exchange temperatures detected by the heat exchange temperature sensors 61a to 61c are the expansion valves 100a to 100c. This is the time required to decrease due to the interruption of the refrigerant inflow due to any full closure of 100c, which is obtained in advance through a test or the like and stored in the storage unit 220.

  If the amount of air flowing into the indoor heat exchanger with a small heat exchange amount Ha is the same as that of the indoor heat exchanger with a large heat exchange amount Ha, before and after the expansion valve is fully closed in the indoor heat exchanger with a small heat exchange amount Ha The degree of decrease in the heat exchange temperature is smaller than the degree of decrease in the heat exchange temperature before and after the expansion valve is fully closed in the indoor heat exchanger having a large heat exchange amount Ha. However, as described above, if setting is made so that the fan rotation speed Rf at the time of determination increases as the heat exchange amount Ha decreases, an indoor heat exchanger with a large heat exchange amount Ha even in an indoor heat exchanger with a small heat exchange amount Ha. The degree of decrease in the heat exchange temperature before and after the fully closed expansion valve can be obtained.

  After one of the expansion valves 100a to 100c is fully closed and a predetermined time tp has elapsed, the heat exchange temperature sensors 61a to 61c of the indoor units 5a to 5c corresponding to the fully closed expansion valves 100a to 100c are used. The detected heat exchange temperature (hereinafter referred to as heat exchange temperature after full closure) is taken in, and a temperature difference is calculated by subtracting the heat exchange temperature after full closure from the heat exchange temperature before judgment of the indoor unit. And if this temperature difference is more than a predetermined threshold temperature difference (for example, 5 ° C., hereinafter referred to as threshold temperature difference Tth), the indoor heat exchangers 51a to 51c corresponding to the fully closed expansion valves 100a to 100c. Since it is considered that the heat exchange temperature after the fully closed state is greatly reduced due to a decrease in the amount of refrigerant flowing into the 51c, between the expansion valves 100a to 100c that are fully closed and the indoor units 5a to 5c that incorporate the heat exchange temperature. It can be determined that the refrigerant piping and wiring connections are correct.

  On the contrary, after one of the expansion valves 100a to 100c is fully closed and the predetermined time tp has elapsed, the heat exchange of the indoor units 5a to 5c corresponding to the fully closed expansion valves 100a to 100c is performed. If the temperature difference obtained by subtracting the fully-closed heat exchange temperature detected by the temperature sensors 61a to 61c from the pre-determination heat exchange temperature of the indoor unit is less than a predetermined threshold temperature Tth difference, the indoor heat exchanger of the indoor unit The amount of refrigerant flowing into the indoor unit 5a is not changed, that is, the expansion valve corresponding to the indoor unit is not fully closed, or the indoor units 5a to 5a are not corresponding to the fully closed expansion valves 100a to 100c. Since it is considered that the heat exchange temperature of 5c is taken in, either the refrigerant piping or the wiring between the expansion valves 100a to 100c that are fully closed and the indoor units 5a to 5c that take in the heat exchange temperature is incorrect. Determined Kill.

  In the air-conditioning apparatus 1 of the present embodiment, the correct / error determination result described above is stored in the storage unit 220 as the piping / wiring connection determination table 400 shown in FIG. In the piping / wiring connection determination table 400, for each of the indoor units 5a to 5c, the heat exchange amount Ha, the fan rotation speed Rf during determination, the heat exchange temperature before determination (hereinafter referred to as the heat exchange temperature TBE before determination (unit: ° C.)) Description: When it is necessary to refer to the indoor units 5a to 5c individually, they are described as TBEa to TBEc), heat exchange temperature after full closure (hereinafter, heat exchange temperature TAF (unit: ° C) after full closure). 5a to 5c are described as TAFa to TAFc), and the determination result is stored.

  In the piping / wiring connection determination table 400 described above, the heat exchange amount Ha is a value stored by the operator when the air conditioner 1 is installed. The determination-time fan rotation speed Rf refers to the determination-time indoor fan rotation speed table 300, extracts the determination-time fan rotation speed Rf corresponding to the stored heat exchange amount Ha of the indoor units 5a to 5c, It memorize | stores for every machine 5a-5c. The determination-time fan rotation speed Rf is not stored as a value extracted by referring to the determination-time indoor fan rotation speed table 300 as in the present embodiment, but is input by the operator in the same manner as the heat exchange amount Ha. May be stored. When the indoor unit connected to the outdoor unit 2 is known in advance, the heat exchange amount Ha and the determination-time fan rotation speed Rf may be stored in advance when the outdoor unit 2 is shipped.

  On the other hand, the pre-determination heat exchange temperature TBE, the fully-closed heat exchange temperature TAF, and the determination result are stored for each of the indoor units 5a to 5c by making a correct / incorrect determination, and the pre-determination heat exchange temperature TBE is the expansion valve 100a. Is the detected value of the heat exchange temperature sensors 61a to 61c at a predetermined opening degree before the fully closed state of 100c, and the heat exchange temperature TAF after the fully closed state is a heat exchange temperature sensor 61a to 61c after the expansion valves 100a to 100c are fully closed. Is the detected value. Further, the determination result is stored as a result determined to be “OK” or “NG” depending on the result of comparing the temperature difference obtained by subtracting the heat exchange temperature TAF after fully-closed from the heat exchange temperature TBE before judgment and the threshold temperature difference. It is what is done.

  In the piping / wiring connection determination table 400 according to the present embodiment, as an example, for the indoor unit 5a, the heat exchange amount Ha is D, and the determination fan rotation speed Rf is determined by referring to the determination indoor fan rotation speed table 300. Rfd which is the rotation speed corresponding to the exchange amount Ha = D, the heat exchange temperature TBE before judgment is 30 ° C., the heat exchange temperature TAF after full closure is 22 ° C., the heat exchange temperature TBE before judgment and the heat exchange temperature TAF after full closure Since the temperature difference is 8 ° C. and larger than the threshold temperature difference Tth of 5 ° C., the determination result is “OK”. That is, the refrigerant pipes and wiring connections in the outdoor unit 2, the indoor unit 5a, and the expansion valve 100a are correct (as shown in FIG. 1, the outdoor unit 2 and the indoors are connected by the liquid pipe 8a, the first wiring 250a, and the first branch wiring 250aa. The machine 5a also shows the case where the outdoor unit 2 and the expansion valve 100a are connected by the second wiring 250b and the second branch wiring 250ba).

  For the indoor unit 5b, the heat exchange amount Ha is E, the fan rotation speed Rf at the time of determination is Rfd, which is the rotation speed corresponding to the heat exchange amount Ha = E with reference to the indoor fan speed table 300 at the time of determination, and before the determination. The heat exchange temperature TBE is 30 ° C., the heat exchange temperature TAF after full closure is 28 ° C., and the temperature difference between the heat exchange temperature TBE before judgment and the heat exchange temperature TAF after full closure is 2 ° C., which is a threshold temperature difference Tth of 5 ° C. Since it is small, the determination result is “NG”.

  Furthermore, for the indoor unit 5c, the heat exchange amount Ha is B, and the determination fan rotation speed Rf is Rfb, which is the rotation speed corresponding to the heat exchange amount Ha = B with reference to the determination indoor fan rotation speed table 300, determination. The pre-heat exchange temperature TBE is 30 ° C., the heat exchange temperature TAF after full closure is 29 ° C., the temperature difference between the heat exchange temperature TBE before judgment and the heat exchange temperature TAF after full closure is 1 ° C., and the threshold temperature difference Tth is 5 ° C. Since it is smaller, the determination result is “NG”.

  That is, in the indoor unit 5b and the indoor unit 5c, the liquid pipe 8b and the liquid pipe 8c are not connected as shown in FIG. 1 (the outdoor unit 2 and the indoor unit 5c are connected by the liquid pipe 8b, and the liquid pipe 8c Or the first branch wiring 250ab and the first branch wiring 250ac are erroneously connected (the outdoor branch 2 and the indoor unit 5c are connected by the first branch wiring 250ab, The outdoor unit 2 and the indoor unit 5b are connected by the first branch wiring 250ac), or the second branch wiring 250bb and the second branch wiring 250bc are erroneously connected (the outdoor unit 2 and the expansion valve by the second branch wiring 250bb). 100c is connected, and the outdoor unit 2 and the expansion valve 100b are connected by the second branch wiring 250bc), and the connection of either the refrigerant pipe or the wiring in the indoor unit 5b and the indoor unit 5c is incorrect. Yes.

As described above, when correct / incorrect determination is performed using the temperature difference between the pre-determination heat exchange temperature TBE and the post-full-close heat exchange temperature TAF, which are the heat exchange temperatures before and after the expansion valves 100a to 100c are fully closed, The determination-time indoor fan rotation speed table 300 shown in FIG. 2 is used to select a determination-time fan rotation speed Rf according to the heat exchange amount Ha of the indoor units 5a to 5c. Thereby, even if there is a difference in the heat exchange amount Ha of the indoor heat exchangers 51a to 51, if the connection of the refrigerant piping and wiring is correct, the indoor heat exchangers 51a to 51 before and after the expansion valves 100a to 100c are fully closed. The heat exchange temperatures at all change in the same way. Therefore, it is possible to reliably determine whether the refrigerant pipe and the wiring are connected correctly.
<Flow of correct / incorrect determination processing>

  Next, processing when performing correctness determination in the heating operation will be described with reference to FIG. In FIG. 4, ST represents a process step, and the number following this represents a step number. Further, FIG. 4 mainly illustrates the processing related to the present invention, and other processing, for example, control related to the pressure and temperature of the refrigerant circuit 10 mainly performed by the outdoor unit 2 (outdoor unit control means 200). Description of the processing related to the general control of the air conditioner 1 will be omitted.

  When the CPU 210 of the outdoor unit control means 200 starts the right / wrong determination, the compressor 21 is started at a predetermined rotational speed, and the predetermined rotational speed that is the rotational speed when each of the indoor fans 54a to 54c is started with respect to the indoor units 5a to 5c. An indoor fan activation signal including is transmitted (ST1). As described above, the predetermined rotational speed of the compressor 21 is the rotational speed at which the condensation temperature in the indoor heat exchangers 51a to 51c functioning as a condenser becomes a temperature of room temperature + 15 ° C. Moreover, each predetermined rotation speed of indoor fan 54a-54c can make the condensation temperature in indoor heat exchanger 51a-51c be room temperature +15 degreeC, and frost formation does not generate | occur | produce in the outdoor heat exchanger 23 which functions as an evaporator. The rotation speed is low.

  Next, the CPU 210 transmits an opening degree signal including a predetermined opening degree to the expansion valves 100a to 100c of the expansion valve box 100 (ST2). As described above, the predetermined opening degree of the expansion valves 100a to 100c is an intermediate opening degree between full opening and full closing.

  Next, CPU 210 determines whether or not the refrigeration cycle is stable (ST3). As described above, the refrigeration cycle is stable when the condensation temperature reaches room temperature + 15 ° C. and 5 minutes have elapsed. The CPU 210 has a timer function (not shown), takes in the high pressure detected by the high-pressure sensor 31 via the sensor input unit 240, and when the condensation temperature calculated using the taken-in high pressure reaches room temperature + 15 ° C. Start measurement and check if 5 minutes have passed since the condensation temperature reached room temperature + 15 ° C. In addition, CPU210 will reset a timer, if the said timer measurement is complete | finished.

  If the refrigeration cycle is not stable (ST3-No), the CPU 210 returns to ST3 and waits for the refrigeration cycle to stabilize. If the refrigeration cycle is stabilized (ST3-Yes), the CPU 210 uses the pre-determination heat exchange temperature TBE (TBEa to TBEc) that is the heat exchange temperature of the indoor units 5a to 5c detected by the heat exchange temperature sensors 61a to 61c. The included signal is received from the indoor units 5a to 5c (ST4). The CPU 210 stores the pre-determination heat exchange temperatures TBEa to TBEc included in the received signal in the piping / wiring connection determination table 400 in the storage unit 220 in association with the indoor units 5a to 5c.

  Next, the CPU 210 transmits a fully closed signal including that the expansion valve is fully closed toward the expansion valve 100a corresponding to the indoor unit 5a (ST5). Here, the fully closed signal includes the number of pulses (0 pulse) corresponding to the fully closed state of the expansion valve 100a.

  Next, the CPU 210 transmits a signal including the fan rotation speed Rf = Rfd at the time of determination of the indoor unit 5a extracted with reference to the piping / wiring connection table 400 to the indoor unit 5a, and starts timer measurement ( ST6).

  Next, CPU 210 determines whether or not a predetermined time tp has elapsed since the processing of ST6 was started (ST7). If the predetermined time tp has not elapsed (ST7-No), the CPU 210 returns the process to ST7.

  If the predetermined time tp has elapsed (ST7-Yes), the CPU 210 resets the timer and receives a signal including the fully-closed heat exchange temperature TAF transmitted from any of the indoor units 5a to 5c ( ST8). The CPU 210 extracts the post-fully-closed heat exchange temperature TAF from the signal and stores it as the post-fully-closed heat exchange temperature TAFa in the piping / wiring connection determination table 400 in the storage unit 220 in association with the indoor unit 5a.

  Next, the CPU 210 reads the pre-judgment heat exchange temperature TBEa and the fully-closed heat exchange temperature TAFa from the storage unit 220, and the temperature difference obtained by subtracting the post-closed heat-exchange temperature TAFa from the pre-judgment heat exchange temperature TBEa is the threshold temperature difference. It is determined whether it is equal to or greater than Tth (ST9).

  If the temperature difference is equal to or greater than the threshold temperature difference Tth (ST9-Yes), the CPU 210 indicates the correct / incorrect determination result, that is, the outdoor unit 2 and the indoor unit 5a, and the outdoor unit 2 and the expansion valve 100a are shown in FIG. Thus, it is determined that the liquid pipe 8a, the first wiring 250a, the first branch wiring 250aa, the second wiring 250b, and the second branch wiring 250ba are correctly connected, and the process proceeds to ST12. On the other hand, if the temperature difference is less than the threshold temperature difference Tth (ST9-No), the CPU 210 sets NG as a result of the correctness determination, that is, the liquid that connects the outdoor unit 2 and the indoor unit 5a and the outdoor unit 2 and the expansion valve 100a. It is determined that any of the tube 8a, the first wiring 250a, the first branch wiring 250aa, the second wiring 250b, and the second branch wiring 250ba is incorrect, and the process proceeds to ST12.

  For the processing after ST12, the CPU 210 executes the same processing as the above-described ST5 to ST11 for the indoor unit 5b (processing corresponding to ST12 to ST18), and then performs the same processing as ST5 to ST11 for the indoor unit 5c. (Processing corresponding to ST19 to ST25). The correctness / incorrectness determination process for each of the indoor units 5b and 5c is the same as that for the indoor unit 5a, and a description thereof will be omitted.

CPU210 which completed the process of ST24 or ST25 complete | finishes the process regarding a correct / incorrect determination.

  In the embodiment of the present invention described above, only the heat exchange temperature TAF after full closing of the indoor units 5a to 5c corresponding to the fully closed expansion valves 100a to 100c is detected, and only the indoor unit before the determination heat exchange is detected. Whether the temperature TBE and the heat exchange temperature TAF after full closure are obtained is compared with the threshold temperature difference Tth to make a correct / incorrect determination. However, the present invention is not limited to this. After any of the expansion valves 100a to 100c is fully closed, all the post-closed heat exchange temperatures TAF are detected, and all the indoor units 5a to 5c detect the heat exchange temperature TBE before the determination and the total heat exchange temperature TBE. After obtaining the temperature difference of the heat exchange temperature TAF after closing and confirming whether the indoor unit with the largest temperature difference corresponds to an expansion valve that is fully closed, the temperature difference is referred to as a threshold temperature difference Tth. You may compare.

  As described above, in the air conditioner 1 of the present invention, when the refrigerant circuit 10 is used as a heating cycle and the correctness determination of the connection of the refrigerant piping and wiring is performed, the determination according to the heat exchange amount Ha of the indoor units 5a to 5c. The indoor fans 54a to 54c are driven at the hour fan rotational speed Rf. Thereby, in the indoor heat exchangers 51a to 51c, correctness / incorrectness can be determined as the air volume according to the heat exchange amount Ha, so that the heat exchange temperatures in the indoor heat exchangers 51a to 51 are all before and after the expansion valves 100a to 100c are fully closed. In other words, since the temperature difference between the pre-determining heat exchange temperature TBE and the fully-closed heat exchange temperature TAF can be set to an appropriate value in each of the indoor units 5a to 5c, the indoor unit 5a having any heat exchange amount Ha. Even if ˜5c is connected to the outdoor unit 2, the correctness / incorrectness determination can be performed.

DESCRIPTION OF SYMBOLS 1 Air conditioning apparatus 2 Outdoor unit 5a-5c Indoor unit 21 Compressor 23 Outdoor heat exchanger 51a-51c Indoor heat exchanger 54a-54c Indoor fan 61a-61c Heat exchange temperature sensor 100 Expansion valve box 100a-100c Expansion valve 200 Outdoor Machine control unit 210 CPU
220 Storage Unit 240 Sensor Input Unit 250a First Wiring 250aa-250ac First Branch Wiring 250b Second Wiring 250ba-250bc Second Branch Wiring 300 Indoor Fan Rotation Speed Table 400 Judgment / Wiring Combination Determination Table Ha, Haa-Hac Heat Exchange amount Rf, Rfa to Rfc Indoor fan speed TBE, TBEa to TBEc Heat exchange temperature before judgment TAF, TAFa to TAFc Heat exchange temperature after full closure Tth threshold temperature tp Predetermined time

Claims (1)

An air conditioner having an outdoor unit, a plurality of indoor units, a number of flow rate adjusting units corresponding to the number of the plurality of indoor units, and a control unit,
The outdoor unit, the plurality of indoor units and the flow rate adjusting means are connected by a refrigerant pipe,
The outdoor unit and the plurality of indoor units are connected by indoor unit wiring,
The outdoor unit and the flow rate adjusting means are connected by a flow rate adjusting means wiring,
The plurality of indoor units have an indoor heat exchanger, an indoor fan, and a heat exchange temperature detecting means for detecting a heat exchange temperature that is a temperature of the indoor heat exchanger,
The control means includes
When the heat exchange amount in the indoor heat exchanger of at least one indoor unit is different from the heat exchange amount of the indoor heat exchanger in another indoor unit, the refrigerant pipe, the indoor unit wiring, and the flow rate adjusting unit wiring are connected When performing correct / incorrect judgment,
All the flow rate adjusting means are opened to perform the heating operation, and the pre-determination heat exchange temperature that is the heat exchange temperature of each indoor heat exchanger after the heating operation state is stabilized,
After detecting the pre-determination heat exchange temperature, the specific one flow rate adjusting unit is closed and the indoor fan of the indoor unit corresponding to the flow rate adjusting unit is set according to the heat exchange amount of the indoor heat exchanger of the indoor unit. When it is driven at the fan rotation speed at the time of determination that is the rotation speed and the predetermined time elapses, the heat exchange temperature after full closing, which is the heat exchange temperature of the indoor heat exchanger of the indoor unit corresponding to the flow adjustment means that is fully closed Detect
A temperature difference obtained by subtracting the post-fully closed heat exchanger temperature from the pre-determined heat exchanger temperature of the indoor unit corresponding to the fully closed flow rate adjusting means among the plurality of pre-determined heat exchanger temperatures is a predetermined threshold temperature. If the difference is greater than or equal to the difference, the refrigerant pipe, the indoor unit wiring, and the flow rate adjusting unit wiring are correctly connected, and if the temperature difference is less than the threshold temperature difference, the refrigerant pipe, the indoor unit wiring, and the flow rate adjustment. Determining that any one of the means wirings is in error;
An air conditioner characterized by that.

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