JP2007139265A - Operation control method and program for multiple type air conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a comfortable air-conditioned environment when an automatic operation mode is set. <P>SOLUTION: The operation control method for the multiple type air conditioner has a process of acquiring an indoor temperature of each place installed with an indoor unit, a process of detecting the number of indoor units with indoor temperatures that is more than a cooling change-over threshold determined on the basis of a set temperature when a heating operation mode is selected as a present operation mode, a process of changing the present operation mode to a cooling operation mode when the detected number is a predetermined number or more, a process of determining the indoor temperature on the basis of the set temperature and detecting the number of indoor units being a heating change-over threshold or less, lower than the cooling change-over threshold, when the cooling operation mode is selected as the present operation mode, and a process of changing the present operation mode to the heating operation mode when the detected number is a predetermined number or more. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an operation control method and program for a multi-type air conditioner.

  An air conditioner that performs indoor heating and dehumidification and dehumidification (hereinafter collectively referred to as “air conditioning”) has a configuration in which an indoor unit and an outdoor unit are connected by a refrigerant pipe and electrical wiring. Such an air conditioner uses a heat pump that forms a refrigerant circulation circuit with a compressor, an outdoor heat exchanger, a throttle mechanism, an indoor heat exchanger, and a four-way valve as main components, and is sent from the compressor. The desired air conditioning operation is performed by switching the circulation direction of the refrigerant by operating the four-way valve.

  In such an air conditioner, a multi-type air conditioner having a configuration in which a plurality of indoor unit units are connected to a set of outdoor unit is known. In the multi-type air conditioner, there are a type in which various indoor units can perform automatic cooling / heating automatic operation, and a type in which different indoor units can simultaneously perform automatic cooling / heating automatic operation control. In the former multi-system, each indoor unit can be operated in different modes.However, in the latter multi-system, all indoor units need to be operated in the same cooling or heating operation mode. The problem of how to decide arises. In particular, in the automatic operation mode in which operation is performed by automatically determining one of the cooling operation mode and the heating operation mode, different judgments may be made in each indoor unit. Therefore, automatic operation control in a multi-type air conditioner was considered difficult.

As a method for solving such a problem, for example, one of a plurality of indoor units is set as a master unit, the other indoor units are set as slave units, and the operation mode of the indoor unit of the slave unit is set as the indoor unit of the master unit. An operation control method for avoiding a collision of the operation modes between the indoor units by unifying the operation modes of all the indoor units by always operating in accordance with the operation mode is known (for example, Patent document 1 etc.).
JP 7-12393 A

  However, in the operation control method disclosed in Patent Document 1, the operation mode of all the indoor units of the slave units is determined according to the operation mode of the indoor unit of the master unit. Even in a case where the indoor environment in which the child machine is installed and the indoor environment in which the child device is installed are greatly different, air conditioning is performed in an operation mode corresponding to the indoor environment of the parent device. For this reason, there was a problem that a comfortable air-conditioning environment could not be provided in the room where the handset was installed.

  The present invention has been made in order to solve the above-described problems. When the automatic operation mode is set, the multi-type air conditioning can provide a comfortable air-conditioning environment by selecting a suitable operation mode. It is an object of the present invention to provide a machine operation control method and program.

In order to solve the above problems, the present invention employs the following means.
The present invention is used in a multi-type air conditioner including an outdoor unit and a plurality of indoor units that are connected to the outdoor unit and operated in the same operation mode, and an automatic operation mode and a set temperature are set. A multi-type air conditioner operation control method that selectively selects a heating operation mode and a cooling operation mode, and performs operation control while switching the operation mode to be selected. When the heating operation mode is selected as the current operation mode, and the room temperature is equal to or higher than the cooling switching threshold determined on the basis of the set temperature. The process of detecting the number of indoor units, and when the detected number is greater than or equal to a predetermined number, the current operation mode is switched to the cooling operation mode. And when the cooling operation mode is selected as the current operation mode, the room temperature is determined based on the set temperature and is equal to or lower than the heating switching threshold lower than the cooling switching threshold. Provided is an operation control method for a multi-type air conditioner having a process of detecting the number of units and a process of switching a current operation mode to the heating operation mode when the detected number is equal to or greater than a predetermined number. .

According to the above-described invention, when the heating operation mode is selected, when there are a predetermined number or more of indoor units whose indoor temperature is equal to or higher than the cooling switching threshold, the cooling operation mode is switched to. When the mode is selected, when there are a predetermined number of indoor units whose indoor temperature is equal to or lower than the heating switching threshold, the mode is switched to the heating operation mode. Therefore, the heating operation mode and the cooling operation mode are selected according to the room temperature. Can be implemented while switching at a suitable timing. This makes it possible to provide a comfortable air-conditioning environment while controlling the operation of a plurality of indoor units in the same operation mode.
The predetermined number is an arbitrary number of 1 or more. The smaller the predetermined number is set, the more frequently the operation mode is switched.

  The present invention is used in a multi-type air conditioner including an outdoor unit and a plurality of indoor units that are connected to the outdoor unit and operated in the same operation mode, and an automatic operation mode and a set temperature are set. A multi-type air conditioner operation control method that selectively selects a heating operation mode and a cooling operation mode, and performs operation control while switching the operation mode to be selected. The process of acquiring the room temperature of each place where the is installed, the process of detecting the number of indoor units that the room temperature is equal to or higher than the cooling switching threshold determined based on the set temperature, and the room temperature, A process of detecting the number of indoor units that are determined based on the set temperature and that are equal to or less than the heating switching threshold that is smaller than the cooling switching threshold; The number of indoor units whose indoor temperature is equal to or higher than the cooling switching threshold is compared with the number of indoor units whose indoor temperature is equal to or lower than the heating switching threshold, and according to the comparison result, the cooling operation mode and the There is provided a multi-type air conditioner operation control method including a process of selecting one of heating operation modes.

  According to the above invention, the number of indoor units whose indoor temperature is equal to or higher than the cooling switching threshold and the number of indoor units whose indoor temperature is equal to or lower than the heating switching threshold are detected. The operation mode is selected. For example, if the number of indoor units whose room temperature is equal to or higher than the cooling switching threshold is greater than the number of indoor units whose room temperature is equal to or lower than the heating switching threshold, the cooling operation mode is selected. Is selected. As described above, when the indoor units that require the heating operation and the indoor units that require the cooling operation coexist, priority can be given to the operation with a large number of required units, thereby increasing the overall requirement satisfaction. As a result, more room temperatures can be brought close to the set temperature in a balanced manner.

  The present invention is used in a multi-type air conditioner including an outdoor unit and a plurality of indoor units that are connected to the outdoor unit and operated in the same operation mode, and an automatic operation mode and a set temperature are set. A multi-type air conditioner operation control method that selectively selects a heating operation mode and a cooling operation mode, and performs operation control while switching the operation mode to be selected. A process of obtaining the indoor temperature of each place where the temperature is set, a process of calculating a difference between the lowest indoor temperature and the set temperature as a heating determination value, and the highest indoor temperature and the set temperature. The process of calculating the difference as a cooling determination value, and when the heating determination value is larger than the cooling determination value, the heating operation mode is selected, and the cooling determination value is It provides a method for controlling the operation of the multi-type air conditioner and a process of selecting the cooling operation mode is greater than tufts determination value.

  According to the above invention, the operation mode is selected based on the room temperature farthest from the set temperature. For example, when the room temperature farthest from the set temperature is lower than the heating switching threshold, the heating operation mode is selected, and when the room temperature farthest from the set temperature is higher than the cooling switching threshold, The operation mode is selected. As a result, the room temperature farthest from the set temperature can be quickly brought close to the set temperature.

  In the above invention, the process of comparing each room temperature and a cooling switching threshold value determined based on the set temperature, each room temperature and the cooling temperature threshold value defined based on the set temperature, and Each of the heating switching threshold values smaller than each other, and when all the indoor temperatures are equal to or higher than the heating switching threshold value and lower than the cooling switching threshold value, the currently selected operation mode is maintained. You may make it do.

  In this way, when the room temperature is concentrated near the set temperature and the variation is small, the currently selected operation mode is maintained, so the air conditioning can be performed efficiently without switching unnecessary operation modes. Can be performed.

  The present invention is used in a multi-type air conditioner including an outdoor unit and a plurality of indoor units that are connected to the outdoor unit and operated in the same operation mode, and an automatic operation mode and a set temperature are set. A multi-type air conditioner operation control method that selectively selects a heating operation mode and a cooling operation mode, and performs operation control while switching the operation mode to be selected. The process of acquiring the room temperature of each place where the air conditioner is installed, the process of comparing the room temperature and the cooling switching threshold determined based on the set temperature, the room temperature, and the set temperature And the room that is equal to or lower than the heating switching threshold and the process of comparing the heating switching threshold smaller than the cooling switching threshold. When at least one of the temperature and the indoor temperature that is equal to or higher than the cooling switching threshold exists, a difference between the indoor temperature that is equal to or lower than the heating switching threshold and the set temperature is calculated, and the difference is further calculated. The cooling switching is performed when at least one of the process of calculating the heating determination value by integrating, the room temperature that is not more than the heating switching threshold, and the room temperature that is not less than the cooling switching threshold exists. The process of calculating the difference between the indoor temperature that is equal to or higher than the threshold and the set temperature, and further calculating the cooling determination value by integrating the difference, and heating when the heating determination value is greater than the cooling determination value Operation control of a multi-type air conditioner having a process of selecting an operation mode and selecting a cooling operation mode when the cooling determination value is larger than the heating determination value The law provides.

  According to the above invention, an indoor unit whose indoor temperature is equal to or higher than the cooling switching threshold is detected, and in each detected indoor unit, the difference between the indoor temperature and the set temperature is calculated, and this difference is integrated. Thus, a cooling determination value that is a required degree of cooling operation is calculated. Similarly, an indoor unit whose indoor temperature is equal to or lower than the heating switching threshold is detected, and in each detected indoor unit, a difference between the indoor temperature and the set temperature is calculated, and further, the difference is integrated, thereby heating. A heating determination value that is a required degree of operation is calculated. Then, the cooling determination value and the heating determination value are compared, and the operation mode belonging to the larger value is selected. Thus, since the integrated value of the difference between the room temperature and the set temperature is used as the cooling determination value and the heating determination value, air conditioning that further reflects the indoor environment can be performed. Thereby, effective air conditioning can be realized and a more comfortable environment can be provided to the user.

  The present invention is used in a multi-type air conditioner including an outdoor unit and a plurality of indoor units that are connected to the outdoor unit and operated in the same operation mode, and an automatic operation mode and a set temperature are set. A multi-type air conditioner operation control program for selectively selecting a heating operation mode and a cooling operation mode, and performing operation control while switching the operation mode to be selected. A step of obtaining the indoor temperature of each place where the indoor unit is installed, and a cooling switching threshold value in which the indoor temperature is determined based on the set temperature when the heating operation mode is selected as the current operation mode The step of detecting the number of indoor units as described above, and if the detected number is equal to or greater than a predetermined number, the current operation mode is changed to the cooling mode. When the cooling operation mode is selected as the current operation mode and the step of switching to the operation mode, the room temperature is determined based on the set temperature and lower than the heating switching threshold value that is lower than the cooling switching threshold value Multi-type air conditioning for causing a computer to execute a step of detecting the number of indoor units, and a step of switching the current operation mode to the heating operation mode when the detected number is equal to or greater than a predetermined number A machine operation control program is provided.

  The present invention is used in a multi-type air conditioner including an outdoor unit and a plurality of indoor units that are connected to the outdoor unit and operated in the same operation mode, and an automatic operation mode and a set temperature are set. A multi-type air conditioner operation control program for selectively selecting a heating operation mode and a cooling operation mode, and performing operation control while switching the operation mode to be selected. Acquiring the indoor temperature of each place where the indoor unit is installed, detecting the number of indoor units whose indoor temperature is equal to or higher than a cooling switching threshold determined based on the set temperature, and the indoor temperature Is determined based on the set temperature, and is an indoor unit table that is equal to or less than the heating switching threshold value that is smaller than the cooling switching threshold value. Comparing the number of indoor units whose indoor temperature is equal to or higher than the cooling switching threshold and the number of indoor units whose indoor temperature is equal to or lower than the heating switching threshold, and according to the comparison result, An operation control program for a multi-type air conditioner for causing a computer to execute the step of selecting one of the cooling operation mode and the heating operation mode is provided.

  The present invention is used in a multi-type air conditioner including an outdoor unit and a plurality of indoor units that are connected to the outdoor unit and operated in the same operation mode, and an automatic operation mode and a set temperature are set. A multi-type air conditioner operation control program for selectively selecting a heating operation mode and a cooling operation mode, and performing operation control while switching the operation mode to be selected. A step of respectively acquiring a room temperature of each place where an indoor unit is installed, a step of calculating a difference between the lowest room temperature and the set temperature as a heating determination value, and the highest room temperature and the set temperature. Calculating the difference between the cooling determination value and the heating operation mode when the heating determination value is greater than the cooling determination value Provides operation control program of a multi-type air conditioner for executing the steps of the cooling judgment value selects the cooling operation mode is greater than the heating judgment value to the computer.

  The present invention is used in a multi-type air conditioner including an outdoor unit and a plurality of indoor units that are connected to the outdoor unit and operated in the same operation mode, and an automatic operation mode and a set temperature are set. A multi-type air conditioner operation control program for selectively selecting a heating operation mode and a cooling operation mode, and performing operation control while switching the operation mode to be selected. Obtaining each room temperature at each location where an indoor unit is installed, comparing each room temperature with a cooling switching threshold determined on the basis of the set temperature, each room temperature, and A step of comparing each of the heating switching threshold values that are determined with reference to a set temperature and that is smaller than the cooling switching threshold value; When at least one of the room temperature that is not more than the replacement threshold and the room temperature that is not less than the cooling switching threshold exists, the difference between the room temperature that is not more than the heating switching threshold and the set temperature is calculated. Further, there is at least one of the step of calculating the heating determination value by integrating the differences, the room temperature that is not more than the heating switching threshold, and the room temperature that is not less than the cooling switching threshold. A step of calculating a difference between the indoor temperature that is equal to or higher than the cooling switching threshold and the set temperature, and calculating a cooling determination value by integrating the difference; and the heating determination value is the cooling determination Selecting a heating operation mode when greater than a value, and selecting a cooling operation mode when the cooling determination value is greater than the heating determination value; Providing operation control program of a multi-type air conditioner to be executed by a computer.

  Advantageous Effects of Invention According to the present invention, there is an effect that a comfortable air conditioning environment can be provided by selecting a suitable operation mode when the automatic operation mode is set.

  Hereinafter, an embodiment in which an operation control method for a multi-type air conditioner according to the present invention is applied to an air conditioning free multi-air conditioner will be described with reference to the drawings.

  First, the configuration of the air conditioning free multi air conditioner and each operation pattern will be described using FIGS. 1 to 6, and then the operation control method related to the present invention will be described using FIGS. 7 to 16.

FIG. 1 shows a schematic configuration of an air conditioning free multi-air conditioner (air conditioner).
The air conditioning free multi-air conditioner has one outdoor unit (outdoor unit) 1 and a plurality of indoor units (indoor units) 3a to 3g (hereinafter, all indoor units are simply denoted by “3”, When a unit is shown, reference numerals “3a”, “3b”, etc. are attached.), And a high-pressure gas pipe 5, a low-pressure gas pipe 7 and a liquid pipe 9 are connected. Further, between the outdoor unit 1 and the indoor unit 3, the flow dividing controllers 46 a to 46 d for switching the high pressure gas pipe 5 and the low pressure gas pipe 7 (hereinafter, when all the flow dividing controllers are shown, the symbol “46” is simply used. The reference numerals “46a”, “46d”, and the like are attached to each branch controller.). In FIG. 1, reference numerals 100a to 100d denote remote controllers.

  A plurality of indoor units 3 can be connected to each shunt controller 46. In FIG. 1, four indoor units 3a to 3d are connected to the shunt controller 46a, and indoor units 3e to 3g are connected to the shunt controllers 46b to 46d. The case where one each is connected is shown as an example.

  In the air conditioning free multi-air conditioner, the indoor units 3a to 3d, 3e, 3f, and 3g connected to the different diversion controllers 46a to 46d can be operated in different operation modes, as will be described later. On the other hand, indoor units connected to the same diversion controller 46, for example, indoor units 3a to 3d connected to the same diversion controller 46a in FIG. 1, are required to operate in the same operation mode. For example, when the indoor unit 3a is in the heating mode, the other indoor units 3b to 3d are also required to operate in the heating mode.

  Next, the configuration of the air conditioning free multi-air conditioner will be described more specifically with reference to FIGS. 2 to 6. In FIG. 1, four indoor units are connected to the flow dividing controller 46 a, but in FIGS. 2 to 6, only one is shown in a simplified manner.

The outdoor unit 1 includes, for example, two compressors 10 and, for example, two outdoor heat exchangers 12.
The outdoor heat exchanger 12 exchanges heat with outdoor air, and operates as a condenser or an evaporator depending on the state of the refrigerant passing therethrough. Between the outdoor heat exchangers 12a and 12b and the liquid pipe 9 between the receivers 23 and in the vicinity of the outdoor heat exchangers 12a and 12b, outdoor expansion valves (expansion valves) 11a and 11b, respectively. (Hereinafter, when referring to both outdoor expansion valves, the symbol “11” is simply attached, and when referring to each outdoor expansion valve, the symbol “11a” or “11b” is attached.). An electronic expansion valve is used as the outdoor expansion valve 11.

  Outdoor expansion valve bypass pipes 16a and 16b for bypassing the outdoor expansion valves 11a and 11b are provided, and the refrigerant flow from the outdoor heat exchangers 12a and 12b to the receiver 23 is allowed in the bypass pipes 16a and 16b. , Check valves 19a and 19b are provided to prevent the reverse flow. The outdoor expansion valve bypass pipe 16a connected to one first outdoor heat exchanger 12a is provided with a bypass cutoff valve 21 that is an electromagnetic valve upstream of the check valve 19a.

The pipes connected to the receiver 23 side of the outdoor expansion valves 11 a and 11 b join at the junction 9 a of the liquid pipe 9.
Each of the outdoor heat exchangers 12a and 12b includes a liquid pipe side temperature sensor 30a and 30b provided on the liquid pipe 9 side, and a four-way valve side temperature sensor 32a provided on the outdoor four-way valve 14a and 14b side, respectively. 32b is provided.
In addition, an outdoor temperature sensor 34 that measures the outdoor temperature, that is, the outdoor temperature, is provided in the vicinity of the outdoor heat exchangers 12a and 12b.

A scroll compressor is preferably used for each of the compressors 10a and 10b. Two of these compressors 10a and 10b may be operated simultaneously depending on the required capacity, or only one unit may be operated and the other unit may be used as a backup.
The refrigerant compressed by the compressor 10 becomes a high-pressure gas refrigerant and is discharged to the high-pressure gas pipe 5. The high pressure gas pipe 5 is provided with a high pressure sensor PSH for measuring the pressure of the discharged refrigerant. The discharge pipes of the compressors 10a and 10b are provided with discharge pipe temperature sensors 36a and 36b for measuring the discharge pipe temperature.

  For example, R410A is used as the refrigerant used in the air conditioning free multi air conditioner according to the present embodiment. This R410A has a density 1.4 (5 ° C.) times that of conventional refrigerants R22 and R407C, and is a high-density and high-pressure refrigerant capable of 1.6 (5 ° C.) times higher pressure. It has the advantages of exhibiting high refrigeration capacity and low pressure loss.

  The high-pressure gas pipe 5 positioned in the outdoor unit 1 branches at branch points 5a and 5b, and the branch pipes 6a and 6b are connected to the outdoor four-way valves 14a and 14b at the high-pressure gas pipe port 14-1. . The outdoor four-way valves 14a and 14b include an outdoor heat exchanger side port 14-2 connected to the outdoor heat exchangers 12a and 12b, and low pressure gas branch pipes 15a and 15b branched at a branch point 7d of the low pressure gas pipe 7, respectively. Low pressure gas pipe side port 14-3 connected to 15b, and bypass pipe side port 14-4 connected to low pressure gas branch pipes 15a, 15b via strainers 17a, 17b and capillary tubes 18a, 18b. Yes.

  The low-pressure gas pipe 7 located in the outdoor unit 1 is connected to the compressors 10 a and 10 b via the accumulator 20. The liquid refrigerant collected in the accumulator 20 is returned to the compressors 10a and 10b through the liquid refrigerant return lines 22a and 20b. A low pressure sensor PSL and a suction pipe temperature sensor 38 for measuring the low pressure of the system are provided upstream of the accumulator 20 (that is, the suction pipe). The low pressure sensor PSL measures the refrigerant gas pressure sucked into the compressor 10.

  In the outdoor heat exchangers 12a and 12b, the liquid pipe 9 is connected to the side opposite to the side connected to the outdoor side four-way valves 14a and 14b. The liquid pipe 9 in the outdoor unit 1 includes a receiver 23 that stores the liquid refrigerant and a supercooler 25 that supercools the refrigerant that flows through the liquid pipe 9 during the cooling operation. The subcooler 25 takes out a part of the liquid refrigerant flowing through the liquid pipe 9 and supercools the liquid refrigerant flowing through the liquid pipe 9 with the refrigerant that is expanded and vaporized by the expansion valve 25a and cooled. The gas refrigerant used for subcooling and vaporized is returned to the accumulator 20.

A plurality of indoor units 3 are provided, and the configuration of each indoor unit 3 is the same.
The indoor unit 3 includes an indoor heat exchanger 40 that exchanges heat with room air. The indoor heat exchanger 40 is provided with temperature sensors 33 and 35 for measuring the temperature before and after the indoor heat exchanger 40. In the vicinity of the indoor heat exchanger 40, an indoor temperature sensor 37 for measuring the indoor temperature is provided.
An indoor expansion valve 42 is provided in the liquid refrigerant branch pipe 44 connecting the indoor heat exchanger 40 and the liquid pipe 9.

The shunt controller 46 has the following configuration.
The shunt controller 46 includes an indoor four-way valve 48. The indoor-side four-way valve 48 includes a high-pressure gas pipe port 48-1 connected to the high-pressure gas branch pipe 5c branched from the main pipe of the high-pressure gas pipe 5, and the indoor heat exchanger side connected to the indoor heat exchanger 40 side. The port 48-2, the low-pressure gas pipe port 48-3 connected to the indoor-side low-pressure gas branch pipe 7c branched from the main pipe of the low-pressure gas pipe 7, and the midway position 49 of the indoor-side low-pressure gas branch pipe 7c merge. A low-pressure bypass pipe port 48-4 connected to the low-pressure bypass pipe 50.

  The indoor four-way valve 48 communicates the high-pressure gas pipe port 48-1 and the indoor heat exchanger-side port 48-2 during heating operation, and the low-pressure gas pipe port 48-3 and the low-pressure bypass pipe port 48-4. Communicate with. The indoor four-way valve 48 communicates the high-pressure gas pipe port 48-1 and the low-pressure bypass pipe port 48-4 during cooling operation, and the indoor heat exchanger-side port 48-2 and low-pressure gas pipe port 49. -3.

A high-pressure gas branch pipe open / close valve 52 is provided in the high-pressure gas branch pipe 5 c upstream of the indoor side four-way valve 48. A high-pressure gas branch pipe bypass passage 54 is formed so as to bypass the high-pressure gas branch pipe on-off valve 52, and a first capillary tube 55 is provided in the high-pressure gas branch pipe bypass passage 54.
A second capillary tube 57 is provided in the low pressure bypass pipe 50 on the downstream side of the indoor side four-way valve 48.

  There is a high-low pressure bypass between the high-pressure gas branch pipe 5c upstream of the high-pressure gas branch pipe bypass passage 54 and the indoor low-pressure gas branch pipe 7c downstream of the low-pressure bypass pipe 50 (downstream of the midway position 49). A tube 58 is provided. The high / low pressure bypass pipe 58 is provided with a high / low pressure bypass pipe open / close valve 60 and a third capillary tube 62 in order from the high pressure gas branch pipe 5c side toward the indoor side low pressure gas branch pipe 7c side.

As shown in FIG. 3, the above-described air conditioning free multi air conditioner includes an outdoor control device CL <b> 1 that controls the outdoor unit 1 including the compressor 10 and the outdoor heat exchanger 12, and an indoor heat exchanger 40 and a shunt controller 46. And an indoor control device CL2 for controlling the unit 3. The indoor control device CL2 is provided for each branch controller. In the present embodiment, one unit is provided for each of the indoor units 3a to 3d, and one unit is provided for each of the indoor units 3e, 3f, and 3g. The outdoor control device CL1 and the indoor control device CL2 communicate with each other.
In FIG. 3, the same components as those used in FIG. 2 are denoted by the same reference numerals, and the description thereof is omitted. Further, although two outdoor heat exchangers 12a and 12b, compressors 10a and 10b, and outdoor four-way valves 14a and 14b are shown in FIG. 2, only one is shown in FIG. 3 in a simplified manner. ing.

The outdoor control device CL1 includes a control unit 70 and an input unit 72.
The control unit 70 calculates each control value based on the data obtained from the input unit 72. This control value is sent to each control device such as the outdoor expansion valve 11a, the outdoor fan F1, the outdoor four-way valve 14a, and the compressor 10a. Each calculation result of the control unit 70 is sent to the input unit 82 of the indoor control device CL2.
The input unit 72 includes a liquid pipe side temperature sensor 30a provided in the outdoor heat exchanger 12a, a four-way valve side temperature sensor 32a, an outdoor temperature sensor 34 provided in the vicinity of the outdoor heat exchanger 12a, and a discharge from the compressor 10a. Output values of the discharge pipe temperature sensor 36a, the high pressure sensor PSH provided in the pipe, the low pressure sensor PSL provided on the upstream side of the accumulator 20, and the suction pipe temperature sensor 38 are input.

The indoor control device CL1 includes a control unit 80 and an input unit 82.
The control unit 80 calculates each control value based on the data obtained from the input unit 82. This control value is sent to control devices such as the indoor expansion valve 42, the indoor fan F2, and the indoor side four-way valve 48 of the shunt controller 46. Each calculation result of the control unit 80 is sent to the input unit 72 of the outdoor control device CL1.
The output values of the temperature sensors 33 and 35 and the indoor temperature sensor 37 provided in the indoor heat exchanger 40 are input to the input unit 82.

Next, the operation of the entire heating / cooling free multi air conditioner having the above configuration will be described according to each operation pattern.
As will be described below, the air conditioning free multi air conditioner according to the present embodiment appropriately changes the operation of each of the outdoor heat exchangers 12a and 12b by the outdoor control device CL1 in accordance with the required condensation capacity and evaporation capacity. Is.

[All air-conditioning operation]
First, the operation when the cooling operation is selected in all the indoor units 3 will be described with reference to FIG. In this case, the two outdoor heat exchangers 12a and 12b operate as condensers.
The high-pressure gas refrigerant compressed by the compressor 10a branches at the branch points 5a and 5b of the high-pressure gas pipe 5, and flows to the outdoor four-way valves 14a and 14b. On the other hand, a part (very small amount) of the high-pressure gas refrigerant flows to the indoor unit 3 through the high-pressure gas pipe 5 connected to the indoor unit 3. In the outdoor four-way valves 14a and 14b (which may be used in two units), the high pressure gas pipe port 14-1 and the outdoor heat exchanger side port 14-2 communicate with each other, and the low pressure gas pipe side port 14-3 The bypass pipe side port 14-4 is in communication. In this case, the outdoor four-way valves 14a and 14b, which are electromagnetic valves, are turned off without being conducted.

  Therefore, the high-pressure gas refrigerant that has flowed into the high-pressure gas pipe port 14-1 passes through the outdoor heat exchanger side port 14-2 and is guided to the outdoor heat exchangers 12a and 12b. On the other hand, the low pressure gas pipe side port 14-3 and the bypass pipe side port 14-4 of the outdoor four-way valves 14a and 14b are communicated with each other, and the flow path passing between the outdoor low pressure gas branches 15a and 15b is a closed loop. Therefore, the high pressure gas refrigerant does not flow into the outdoor low pressure gas branch pipes 15a and 15b, and the low pressure gas refrigerant does not flow from the branch point 7d of the low pressure gas pipe 7. However, the inside of the outdoor low-pressure gas branch pipes 15a and 15b is filled with the low-pressure gas refrigerant.

The high-pressure gas refrigerant that has flowed into the outdoor heat exchangers 12a and 12b exchanges heat with the outside air to dissipate heat and is condensed and liquefied. In this case, both the outdoor expansion valves 11a and 11b are fully opened.
The condensed and liquefied high-pressure liquid refrigerant passes through the receiver 23, is supercooled by the supercooler 25, and then is guided to the indoor unit 3 through the liquid pipe 9. In addition, since the liquid pipe 9 connecting the outdoor unit 1 and the indoor unit 3 may exceed 100 m in length (may not exceed), it is supercooled in this manner in the liquid pipe 9. It is desirable to avoid evaporation of the liquid refrigerant. The expansion valve 25a of the subcooler 25 is PI-controlled by the outdoor control device CL1.

  The high-pressure liquid refrigerant flowing into the indoor unit 3 is branched into the liquid refrigerant branch pipe 44 connected to each indoor unit 3, and then is throttled and expanded by the indoor expansion valve 42 of each indoor unit 3. Thereafter, the liquid refrigerant evaporates in the indoor heat exchanger 40, takes heat from the indoor air, and cools it. The vaporized low-pressure gas refrigerant flows into the indoor side four-way valve 48 of the shunt controller 46. The indoor-side four-way valve 48 communicates the high-pressure gas pipe port 48-1 and the low-pressure bypass pipe port 48-4, and communicates the indoor heat exchanger-side port 48-2 and the low-pressure gas pipe port 49-3. ing. Therefore, the low-pressure gas refrigerant from the indoor heat exchanger 40 flows through the indoor-side four-way valve 48 to the indoor-side low-pressure gas branch pipe 7c, and then passes through the low-pressure gas pipe 7 that is the main pipe to the outdoor unit 1. Led.

In the shunt controller 46, the following refrigerant flow is formed for the high-pressure gas refrigerant. The high-pressure gas refrigerant that has flowed from the high-pressure gas pipe 5 through the high-pressure gas branch pipe 5c branched to each indoor unit 3 has the high-pressure gas branch pipe on-off valve 52 closed, so that the high-pressure gas branch pipe bypass passage 54 is closed. And the pressure is reduced by the first capillary tube 55. The decompressed gas refrigerant passes through the indoor side four-way valve 48 and flows into the low pressure bypass pipe 50, and is throttled by the second capillary tube 57 and the flow rate is adjusted, and then is passed to the indoor side low pressure gas branch pipe 7 c at the midway position 49. Join.
On the other hand, the high / low pressure bypass pipe on / off valve 60 of the branch controller 46 is closed, so that the high pressure gas refrigerant does not flow through the high / low pressure bypass pipe 58.

The low-pressure gas refrigerant flowing into the outdoor unit 1 through the low-pressure gas pipe 7 is returned to the compressor 10a after gas-liquid separation by the accumulator 20.
Thus, in the all-cooling all-unit operation, since the required condensation capacity is large, the two outdoor heat exchangers 12a and 12b are operated as condensers (COND 100%).

[Cooling mainly (interim period: within outdoor fan control range)]
FIG. 4 shows a case where the cooling-dominant operation is performed in an intermediate period such as spring or autumn in which the number of indoor units 3 that perform the cooling operation is larger than the number of indoor units 3 that perform the heating operation. ing. In addition, the outdoor temperature is not too low as in winter (for example, about −5 ° C.), and an outdoor fan (not shown) provided in the outdoor heat exchangers 12a and 12b is operated or stopped (or the rotational speed of the outdoor fan is controlled). This is the case in a range where the condensation capacity can be controlled by.

In this operation pattern, since the required cooling capacity is not large as in the summer, and the required condensation capacity is relatively small (for example, 50% of the capacity), the second outdoor heat exchanger 12b is stopped. The stop of the second outdoor heat exchanger 12b is performed as follows.
The outdoor four-way valve 14b connected to the second outdoor heat exchanger 12b is switched (is connected to the outdoor four-way valve 14b and turned ON), and the high-pressure gas pipe port 14-1 and the outdoor heat exchanger side port 14-2 are connected. , The high pressure gas pipe port 14-1 and the bypass pipe side port 14-4 are communicated, and the outdoor heat exchanger side port 14-2 and the low pressure gas pipe side port 14-3 are communicated. This prevents the high-pressure gas discharged from the compressor 10a from flowing into the second outdoor heat exchanger 12b. Further, the outdoor expansion valve 11b connected to the second outdoor heat exchanger 12b is fully closed.

  The outdoor expansion valve 11a on the downstream side of the other first outdoor heat exchanger 12a is fully opened, and the bypass cutoff valve 21 provided in the outdoor expansion valve bypass pipe 16a is also opened.

The shunt controller 46 of the indoor unit 3a that performs the heating operation is operated as follows.
The indoor side four-way valve 48 of the shunt controller 46 communicates the high pressure gas pipe port 48-1 and the indoor heat exchanger side port 48-2, and the low pressure gas pipe port 48-3 and the low pressure bypass pipe port 48-4. And communicate with. Therefore, the high-pressure gas refrigerant is led to the indoor heat exchanger 40 through the indoor side four-way valve 48, and is condensed and liquefied by the indoor heat exchanger 40 to give heat to the indoor air to perform heating. The high-pressure liquid refrigerant liquefied by the indoor heat exchanger 40 passes through the liquid refrigerant branch pipe 44 and joins the liquid pipe 9 that is the main pipe.

  In this operation pattern, the first outdoor heat exchanger 12a operates as a condenser, and the second outdoor heat exchanger 12b does not operate as a condenser or an evaporator. Therefore, the outdoor heat exchanger 12 as a whole is 50%. It is operating as a condenser.

[All-heating all-unit operation]
Next, the operation when the heating operation is selected in all the indoor units 3 as in winter will be described with reference to FIG. In this case, the two outdoor heat exchangers 12a and 12b operate as an evaporator.

  The high-pressure gas refrigerant compressed by the compressor 10 a is guided to the indoor unit 3 through the high-pressure gas pipe 5. A small portion of the high-pressure gas refrigerant branches at the branch points 5a and 5b of the high-pressure gas pipe 5 and flows into the outdoor four-way valves 14a and 14b. The outdoor four-way valves 14a and 14b communicate with a high-pressure gas pipe port 14-1 and a bypass pipe-side port 14-4, and also with an outdoor heat exchanger-side port 14-2 and a low-pressure gas pipe-side port 14-3. Are communicated (the outdoor four-way valve 14 is turned on and turned on). Therefore, the high-pressure gas refrigerant that has flowed into the outdoor four-way valves 14a and 14b passes through the bypass pipe side port 14-4 and is depressurized by the capillary tubes 18a and 18b, and then flows into the outdoor low-pressure gas branch pipes 15a and 15b. Join. The low-pressure gas refrigerant in the outdoor low-pressure gas branch pipes 15a and 15b passes through the accumulator 20 and is returned to the compressor 10a again. The low-pressure gas refrigerant guided from the outdoor heat exchangers 12a and 12b also flows to the outdoor low-pressure gas branch pipes 15a and 15b via the outdoor four-way valves 14a and 14b.

  The high-pressure gas refrigerant guided to the indoor unit 3 by the high-pressure gas pipe 5 passes through each high-pressure gas branch pipe 5 c and flows into each branch controller 46. The indoor side four-way valve 48 of the shunt controller 46 communicates the high pressure gas pipe port 48-1 and the indoor heat exchanger side port 48-2, and the low pressure gas pipe port 48-3 and the low pressure bypass pipe port 48-4. And communicate with. Therefore, the high-pressure gas refrigerant is led to the indoor heat exchanger 40 through the indoor side four-way valve 48, and is condensed and liquefied by the indoor heat exchanger 40 to give heat to the indoor air to perform heating. The high-pressure liquid refrigerant liquefied by the indoor heat exchanger 40 passes through the liquid refrigerant branch pipe 44 and joins the liquid pipe 9 that is the main pipe. The high-pressure liquid refrigerant is guided to the outdoor unit 1 by the liquid pipe 9.

  The liquid refrigerant sent from the indoor unit 3 via the liquid pipe 9 is decompressed by the outdoor expansion valve 11 located on the upstream side of the outdoor heat exchanger 12. Each outdoor expansion valve 11 is PI-controlled by the outdoor control device CL1. The low-pressure liquid refrigerant decompressed by the outdoor expansion valve 11 is sent to the outdoor heat exchanger 12. The low-pressure liquid refrigerant evaporates by taking heat from the outside air in the outdoor heat exchanger 12 to become a low-pressure gas refrigerant. As described above, the low-pressure gas refrigerant is guided to the outdoor four-way valves 14a and 14b, and then returned to the compressor 10a through the low-pressure gas branch pipes 15a and 15b.

  In the case of this operation pattern, the outdoor heat exchanger 12 is used as an evaporator that operates between 0 to 100% of the capacity as a whole.

[Heating main (interim period)]
As shown in FIG. 6, the number of indoor units 3 for which the heating operation is selected is larger than the number of indoor units 3 for which the cooling operation is selected, and the operation is performed in an intermediate period such as spring or autumn. The pattern is shown.
In this operation pattern, the evaporation capacity is not required as in winter (for example, about 0 to 50% of the capacity). Accordingly, the first outdoor heat exchanger 12a is operated as an evaporator by adjusting the opening degree (PI control) so that the outdoor expansion valve 11a operates as a throttle valve, while the second outdoor heat exchanger 12b is operated outdoors. The expansion valve 11b is fully closed so that it does not operate as an evaporator or a condenser. In the case of this operation pattern, the outdoor heat exchanger 12 is used as an evaporator that operates between 0 to 50% of the capacity as a whole.

  In addition, in the air conditioning free multi air conditioner, in addition to the above operation patterns, the operation pattern is similar to the operation pattern related to “cooling subject (intermediate period: within outdoor fan control range)” shown in FIG. The operation pattern in which the condenser capacity required for the cooler 12 is smaller, the number of indoor units 3 performing the cooling operation and the number of heating operations are equal, and each indoor heat exchanger 40 is balanced with a small capacity. During cooling / heating balance operation and when the outside air temperature is low as in winter, the operation pattern is performed during the cooling / heating balance when the number of indoor units 3 performing cooling operation is equal to the number of heating operations. It is possible to drive according to the driving pattern.

Next, operation control of the indoor units 3a to 3d connected to the same shunt controller 46a among the plurality of indoor units 3a to 3g shown in FIG.
That is, in the above description, in the air conditioning free multi-air conditioner according to the present embodiment, the operation is described based on the respective operation patterns between the indoor units 3a to 3d, 3e, 3f, and 3g connected to the respective diversion controllers 46a to 46d.
On the other hand, in the following, the operation of each indoor unit 3a to 3d corresponding to the lower layer will be described. In the air conditioning free multi air conditioner according to the present embodiment, the indoor units 3a to 3d connected to the same shunt controller 46a are always operated in the same operation mode. Hereinafter, the operation of each indoor unit in each operation mode, that is, the “heating operation mode”, the “cooling operation mode”, and the “automatic operation mode” will be described.
Further, the operation control of the indoor units 3a to 3d described below is performed by the indoor control device CL2 shown in FIG.

[1: Heating operation mode]
First, in the remote control 100a shown in FIG. 1, when the “heating operation mode” is set as the operation mode and “ST” is set as the set temperature, all the indoor units 3a to 3d are installed with their own units. A heating operation or a heating standby operation is performed in relation to the room temperature of the room. Here, the indoor temperature is measured by, for example, the indoor temperature sensor 37 for measuring the indoor temperature provided in the vicinity of the indoor heat exchanger 40, the temperature sensor 33 provided in the vicinity thereof, the temperature sensor 35, or the like. The measured value is adopted.

  Specifically, as shown in FIG. 7, when the room temperature Th is equal to or lower than the heating switching threshold (ST−α) lower than the set temperature ST by a specified value α, the heating operation is performed. The heating switching threshold is a value that is arbitrarily set in a range lower than the set temperature. This heating operation refers to, for example, a state in which the refrigerant is flowing through the indoor exchanger 40 (see FIG. 3 and the like) and the indoor fan F2 is rotating.

  Then, by performing the heating operation, the room temperature Tho gradually increases, and when the first threshold value (ST + β) higher than the set temperature ST by the specified value β is reached, in order to prevent further increase in the room temperature Tho, Switch from heating operation to heating standby operation. The heating standby operation refers to, for example, an operation in which the heating capacity is reduced by stopping the operation of the indoor fan F2 in a state where the refrigerant flows into the indoor heat exchanger 40 (see FIG. 3 and the like). Here, the first threshold is a value that is arbitrarily set in a range that is higher than the set temperature ST and lower than a cooling switching threshold (ST + α) described later.

  Then, by performing the heating standby operation, the room temperature gradually decreases, and when the second threshold value (ST-β) lower than the set temperature ST by the specified value β is reached, in order to prevent further temperature decrease. , Resume heating operation. Here, the second threshold value is a value that is arbitrarily set in a range that is lower than the set temperature ST and higher than the above-described heating switching threshold value (ST-α).

  As described above, when the “heating operation mode” is set by the remote controller 100a, the air conditioning is performed while appropriately switching between the heating operation and the heating standby operation according to the relationship between the room temperature Tho and the set temperature ST. By doing so, the temperature rise in the room is suppressed, and the room temperature is prevented from rising more than the set temperature. In addition, the switching frequency of the operation is reduced by providing hysteresis to the timing for switching from the heating operation to the heating standby operation and the timing for switching from the heating standby operation to the heating operation.

[2: Cooling operation mode]
Next, in the remote control 100a shown in FIG. 1, when the “cooling operation mode” is set as the operation mode and “ST” is set as the set temperature, all the indoor units 3a to 3d are installed. Cooling operation or cooling standby operation is performed in relation to the room temperature of the room. Here, the room temperature is the same as that in the heating operation described above.

  Specifically, as shown in FIG. 8, when the room temperature Th is equal to or higher than the cooling switching threshold (ST + α) higher than the set temperature ST by a specified value α, the cooling operation is performed. This cooling operation refers to, for example, a state in which the refrigerant is flowing through the indoor exchanger 40 (see FIG. 3 and the like) and the indoor fan F2 is rotating. The cooling switching threshold (ST + α) is a value that is arbitrarily set in a range higher than the set temperature.

  Then, when the cooling operation is performed, the indoor temperature Tho gradually decreases, and when the third threshold value (ST-β) lower than the set temperature ST by the specified value β is reached, in order to prevent the indoor temperature Tho from further decreasing. In addition, the cooling operation is switched to the cooling standby operation. The cooling standby operation refers to, for example, an operation in which the cooling capacity is reduced by stopping the operation of the indoor fan F2 in a state where the refrigerant flows into the indoor heat exchanger 40 (see FIG. 3 and the like). Here, the third threshold value is a value that is arbitrarily set in a range that is lower than the set temperature ST and higher than the above-described heating switching threshold value (ST-α).

  Then, by performing the cooling standby operation, the room temperature gradually rises, and when the fourth threshold value (ST + β) higher than the set temperature ST by the specified value β is reached, in order to prevent further temperature rise, Resume operation. Here, the fourth threshold value is a value that is arbitrarily set in a range that is higher than the set temperature ST and lower than the above-described cooling switching threshold value (ST + α).

  As described above, when the “cooling operation mode” is set by the remote controller 100a, air conditioning is performed while appropriately switching between the cooling operation and the cooling standby operation according to the relationship between the room temperature Tho and the set temperature ST. By doing so, it is possible to prevent the indoor temperature from dropping more than the set temperature by suppressing the temperature drop in the room. Further, by providing hysteresis to the timing for switching from the cooling operation to the cooling standby operation and the timing for switching from the cooling standby operation to the cooling operation, the frequency of switching the operation is reduced.

[3-1: Automatic operation mode]
Next, the case where “automatic operation mode” is set as the operation mode and “ST” is set as the set temperature in the remote controller 100a shown in FIG. 1 will be described.
In the automatic operation mode, air conditioning is performed while switching between the heating operation mode and the cooling operation mode described above in accordance with the operation state of each of the indoor units 3a to 3d, the room temperature, and the like. Thus, in the automatic operation mode, a suitable air conditioning environment is provided by switching the heating operation mode and the cooling operation mode at an appropriate timing according to the air conditioning state.
Hereinafter, this will be described in detail with reference to FIG.

FIG. 9 shows a control flow in the automatic operation mode according to one embodiment of the present invention. In the present embodiment, the indoor control device CL2 shown in FIG. 3 repeatedly executes the control flow shown in FIG. 9 at a predetermined timing, thereby realizing the operation control of each indoor unit 3a to 3d in the automatic operation mode. Let
First, in step SA1 of FIG. 9, it is determined whether the heating operation mode is selected as the operation mode. As a result, when the heating operation mode is selected, the process proceeds to step SA2, and it is determined whether or not all the indoor units 3a to 3d are in the above-described heating standby operation (see FIG. 7). As a result, if there is even one indoor unit that is not performing the heating standby operation, that is, if there is even one indoor unit that is in the heating operation, the operation mode is not switched, that is, Then, the operation in the currently selected heating operation mode is maintained, and the process is terminated.

  On the other hand, if all of the indoor units 3a to 3d are in the heating standby operation, the process proceeds to step SA3, and whether there is an indoor unit whose indoor temperature Tho is equal to or higher than the cooling switching threshold (ST + α) (see FIG. 8). Determine. As a result, when there is no indoor unit that is equal to or greater than the cooling switching threshold, the process is terminated without switching the operation mode, that is, while maintaining the selection of the heating operation mode.

  On the other hand, in step SA3, when there is an indoor unit whose indoor temperature Th is equal to or higher than the cooling switching threshold, the process proceeds to step SA4, the operation mode is switched to the cooling operation mode, and the process is terminated. As a result, all the indoor units 3a to 3d are operated in the cooling operation mode shown in FIG.

  Next, in step SA1 of FIG. 9, when the heating operation mode is not selected as the current operation mode, that is, when the cooling operation mode is selected as the current operation mode, the process proceeds to step SA5, and all It is determined whether the indoor units 3a to 3d are performing the above-described cooling standby operation (see FIG. 8). As a result, if there is even one indoor unit that is not in the cooling standby operation, the operation in the currently selected cooling operation mode is maintained without switching the operation mode, and the process is terminated. To do.

  On the other hand, if all the indoor units are in the cooling standby operation in step SA5, the process proceeds to step SA6, and there is an indoor unit whose indoor temperature Tho is equal to or lower than the heating switching threshold (ST-α) (see FIG. 7). It is determined whether or not. As a result, when there is no indoor unit that is equal to or less than the heating switching threshold, the process is terminated without switching the operation mode, that is, while maintaining the selection of the cooling operation mode.

  On the other hand, in step SA6, when there is an indoor unit whose indoor temperature Th is equal to or lower than the heating switching threshold, the process proceeds to step SA7, the operation mode is switched to the heating operation mode, and the process is terminated. Thereby, in all the indoor units 3a to 3d, the operation in the heating operation mode shown in FIG. 7 is performed.

As described above, according to the operation control method according to the present embodiment, when the heating operation mode is selected, when there is an indoor unit whose indoor temperature is equal to or higher than the cooling switching threshold, the operation mode is Similarly, when the cooling operation mode is selected and the cooling operation mode is selected, the operation mode is switched to the heating operation mode when there is an indoor unit whose indoor temperature is equal to or lower than the heating switching threshold. Depending on the temperature, the heating operation mode and the cooling operation mode can be switched at a suitable timing.
This makes it possible to provide a comfortable air-conditioning environment while controlling the operation of a plurality of indoor units in the same operation mode.

Further, for example, as shown in FIGS. 10A to 10C, when the heating operation mode is selected, the indoor temperature is equal to or higher than the first threshold value (see FIG. 7) in all indoor units. Thus, the heating standby operation is performed in all the indoor units 3a to 3d (see FIG. 10A), and then the indoor temperature Tho of one or more indoor units further increases, and the cooling switching threshold (ST + α) When it becomes above, it will switch from heating operation mode to cooling operation mode (refer FIG.10 (b)).
As a result, in the cooling operation mode, the cooling operation is performed until the indoor temperature Th becomes equal to or lower than the third threshold value (ST-β) (see FIG. 8), and therefore all the indoor units are arranged. The temperature of the indoor environment can be lowered (see FIG. 10C).
Thereby, the indoor unit farthest from the set temperature can be brought closer to the set temperature more quickly. Even when the cooling operation mode is selected, the same effect can be obtained by switching to the heating operation mode at the same timing.

  In the present embodiment, the operation mode is switched when there is one or more indoor units whose indoor temperature ST is equal to or higher than the cooling switching threshold (ST + α) in step SA3 in FIG. Instead, in step SA3, when the room temperature ST becomes equal to or higher than the cooling switching threshold (ST + α) in all indoor units, the operation mode may be switched from heating to cooling. Similarly, also in step SA6 of FIG. 9, when the room temperature ST becomes equal to or lower than the heating switching threshold (ST-α) in all the indoor units, the operation mode may be switched from cooling to heating.

  According to such a control method, the operation mode is not switched until the room temperature ST in all the indoor units is equal to or higher than the cooling switching threshold (ST + α) or equal to or lower than the heating switching threshold (ST−α). It becomes. Therefore, since the frequency of switching the operation mode can be reduced, it is possible to efficiently perform air conditioning when there is no change in the temperature condition in which the indoor unit is installed.

  Further, instead of the above example, a predetermined number of indoor units in which the room temperature ST is equal to or higher than the cooling switching threshold (ST + α) or equal to or lower than the heating switching threshold (ST−α) (in this embodiment, two or three). Stand) or more, the operation mode may be switched.

[3-2: Automatic operation mode]
Next, another embodiment of the automatic operation mode described above will be described with reference to FIG.
First, in step SB1 of FIG. 11, it is determined whether the heating operation mode is selected as the operation mode. As a result, when the heating operation mode is selected, the process proceeds to step SB2, and the room temperature Tho of the room in which each of the indoor units 3a to 3d is installed is equal to or higher than the heating switching threshold (ST-α) (FIG. 7). Reference). As a result, when there is at least one indoor unit whose indoor temperature Tho is equal to or lower than the heating switching threshold, the operation mode is not switched, that is, the operation in the currently selected heating operation mode is maintained. The process is terminated.

  On the other hand, if all the indoor units are equal to or higher than the heating switching threshold value, the process proceeds to step SB3 to check whether there is an indoor unit whose indoor temperature Tho is equal to or higher than the cooling switching threshold value (ST + α) (see FIG. 8). judge. This process is the same as step SA3 shown in FIG. As a result, when there is no indoor unit that is equal to or greater than the cooling switching threshold, the process is terminated without switching the operation mode, that is, while maintaining the selection of the heating operation mode. On the other hand, when there is an indoor unit whose indoor temperature Th is equal to or higher than the cooling switching threshold, the process proceeds to step SB4, the operation mode is switched to the cooling operation mode, and the process is terminated.

  Next, in step SB1 of FIG. 11, when the heating operation mode is not selected as the current operation mode, that is, when the cooling operation mode is selected as the current operation mode, the process proceeds to step SB5. It is determined whether or not the room temperature Tho of the room in which the indoor units 3a to 3d are installed is equal to or lower than the cooling switching threshold (ST + α) (see FIG. 8). As a result, when there is at least one indoor unit whose indoor temperature Tho is equal to or higher than the cooling switching threshold, the operation mode is not switched, that is, the operation in the currently selected cooling operation mode is maintained. The process is terminated.

  On the other hand, if all the indoor units are equal to or lower than the cooling switching threshold, the process proceeds to step SB6 and whether there is an indoor unit whose indoor temperature Tho is equal to or lower than the heating switching threshold (ST-α) (see FIG. 7). Determine whether. Since this process is the same as step SA6 shown in FIG. 9, the description thereof is omitted. As a result, when there is no indoor unit whose room temperature is equal to or lower than the heating switching threshold, the process is terminated without switching the operation mode, that is, while maintaining the selection of the cooling operation mode. On the other hand, when there is an indoor unit whose indoor temperature Tho is equal to or lower than the heating switching threshold, the process proceeds to step SB7, the operation mode is switched to the heating operation mode, and the process ends.

  As described above, according to the operation control method according to the present embodiment, for example, when the heating operation mode is selected, as shown in FIG. Even when the indoor unit having the indoor temperature ST equal to or higher than the cooling switching threshold (ST + α) is present, the heating operation mode is switched to the cooling operation mode.

Thereby, in the cooling operation mode, as shown in FIG. 12B, the cooling operation is performed for the indoor unit whose indoor temperature Tho is equal to or higher than the third threshold value (ST-β) (see FIG. 8). As a result, the indoor temperature can be lowered, and the indoor unit having a temperature equal to or lower than the third threshold value can be prevented from further temperature drop by performing the cooling standby operation. As a result, the variation in the indoor temperature between the indoor units can be reduced, and the indoor unit farthest from the set temperature ST can be brought closer to the set temperature ST earlier.
Even when the cooling operation mode is selected, the same effect can be obtained by switching to the heating operation mode at the same timing.

[3-3: Automatic operation mode]
Next, another embodiment of the automatic operation mode described above will be described with reference to FIG.
First, in step SC1 of FIG. 13, it is determined whether or not the heating operation mode is selected as the operation mode. As a result, when the heating operation mode is selected, the process proceeds to step SC2, and it is determined whether or not there is an indoor unit whose indoor temperature Tho is equal to or higher than the cooling switching threshold (ST + α). As a result, if there is no indoor unit whose indoor temperature Tho is equal to or higher than the cooling switching threshold (ST + α), the operation mode is not switched, that is, the operation in the currently selected heating operation mode is maintained. The process is terminated.

  On the other hand, if there is an indoor unit whose room temperature Tho is equal to or higher than the cooling switching threshold (ST + α), the process proceeds to step SC3, where the number Nc (hereinafter simply referred to as “number Nc”) and the room temperature Tho are heated. The number Nw of indoor units (hereinafter simply referred to as “number Nw”) that is equal to or less than the switching threshold (ST−α) is obtained and compared. As a result, when the number Nc is equal to or less than the number Nw, the operation is not switched, that is, the operation in the currently selected heating operation mode is maintained, and the process is terminated.

  On the other hand, if the number Nc is larger than the number Nw in step SC3, the process proceeds to step SC4, the operation mode is switched to the cooling operation mode, and the process is terminated. As a result, all the indoor units 3a to 3d are operated in the cooling operation mode shown in FIG.

  Next, in step SC1 of FIG. 13, when the heating operation mode is not selected as the current operation mode, that is, when the cooling operation mode is selected as the current operation mode, the process proceeds to step SC5. It is determined whether or not there is an indoor unit whose temperature Th is equal to or lower than the heating switching threshold (ST-α). As a result, if there is no indoor unit whose indoor temperature Tho is equal to or lower than the heating switching threshold (ST-α), the operation mode is not switched, that is, the operation in the currently selected cooling operation mode is maintained. Then, the process ends.

  On the other hand, if there is an indoor unit whose room temperature Th is equal to or lower than the heating switching threshold (ST-α), the process proceeds to step SC6, where the number Nw and the number Nc are obtained and compared. As a result, when the number Nw is equal to or less than the number Nc, the operation is not switched, that is, the operation in the currently selected cooling operation mode is maintained, and the process is terminated. On the other hand, when the number Nw is larger than the number Nc in step SC6, the process proceeds to step SC7, the operation mode is switched to the heating operation mode, and the process is terminated. Thereby, in all the indoor units 3a to 3d, the operation in the heating operation mode shown in FIG. 7 is performed.

  As described above, according to the operation control method according to the present embodiment, for example, when the heating operation mode is selected, as shown in FIG. Even in the case where the indoor temperature is increased in other indoor units that are not performing the heating operation and becomes equal to or higher than the cooling switching threshold, the indoor temperature Tho is The number Nw of indoor units below the heating switching threshold is compared with the number Nc of indoor units whose indoor temperature Tho is above the cooling switching threshold. If the number Nc is greater than the number Nw, the operation mode is switched from heating to cooling. It will be.

As a result, in the cooling operation mode, as shown in FIG. 14B, the cooling operation is performed for the indoor unit whose indoor temperature Tho is equal to or higher than the third threshold value (ST-β) (see FIG. 8). The indoor temperature can be lowered by this, and for the indoor unit that is equal to or lower than the third threshold value (ST-β) (see FIG. 8), the cooling standby operation is performed, so that the further temperature drop Can be prevented. As a result, the variation in the indoor temperature between the indoor units can be reduced, and the indoor unit farthest from the set temperature ST can be brought closer to the set temperature ST earlier.
Also, the same effect can be obtained when the cooling operation mode is selected.

[3-4: Automatic operation mode]
Next, another embodiment of the automatic operation mode described above will be described with reference to FIG.
First, in step SD1 of FIG. 15, it is determined whether the heating operation mode is selected as the operation mode. As a result, when the heating operation mode is selected, the process proceeds to step SD2, and it is determined whether or not there is an indoor unit whose indoor temperature Tho is equal to or higher than the cooling switching threshold (ST + α). As a result, if there is no indoor unit whose indoor temperature Tho is equal to or higher than the cooling switching threshold (ST + α), the operation mode is not switched, that is, the operation in the currently selected heating operation mode is maintained. The process is terminated.

  On the other hand, if there is an indoor unit in which the room temperature Th is equal to or higher than the cooling switching threshold (ST + α) in step SD2, the process proceeds to step SD3, and the difference ΔTc (hereinafter “ "Cooling determination value") is calculated, and a difference ΔTw (hereinafter referred to as "heating determination value") between the currently lowest indoor temperature Thomin and the set temperature ST is calculated and compared. As a result, when the cooling determination value ΔTc is equal to or less than the heating determination value ΔTw, the operation is not switched, that is, the operation in the currently selected heating operation mode is maintained, and the process is terminated. To do.

  On the other hand, when the cooling determination value ΔTc is larger than the heating determination value ΔTw in step SD3, the process proceeds to step SD4, the operation mode is switched to the cooling operation mode, and the process ends. As a result, all the indoor units 3a to 3d are operated in the cooling operation mode shown in FIG.

  Next, in step SD1 of FIG. 15, when the heating operation mode is not selected as the current operation mode, that is, when the cooling operation mode is selected as the current operation mode, the process proceeds to step SD5, where It is determined whether or not there is an indoor unit whose temperature Th is equal to or lower than the heating switching threshold (ST-α). As a result, if there is no indoor unit whose indoor temperature Tho is equal to or lower than the heating switching threshold (ST-α), the operation mode is not switched, that is, the operation in the currently selected cooling operation mode is maintained. Then, the process ends.

  On the other hand, when there is an indoor unit whose indoor temperature Tho is equal to or lower than the heating switching threshold (ST-α), the process proceeds to step SD6, and the heating determination value ΔTw is calculated by the same calculation method as in step SD3 described above. Then, the cooling determination value ΔTc is calculated and compared. As a result, when the heating determination value ΔTw is equal to or less than the cooling determination value ΔTc, the operation is not switched, that is, the operation in the currently selected cooling operation mode is maintained, and the process is terminated. To do.

  On the other hand, if the heating determination value ΔTw is greater than the cooling determination value ΔTc in step SD6, the process proceeds to step SD7, the operation mode is switched to the cooling operation mode, and the process is terminated. As a result, all the indoor units 3a to 3d are operated in the cooling operation mode shown in FIG.

  As described above, according to the operation control method according to the present embodiment, for example, when the heating operation mode is selected, as shown in FIG. In other indoor units that are not performing heating operation, if the indoor temperature is very high and exceeds the cooling switching threshold, the highest indoor The difference ΔTc between the temperature Thomax and the set temperature ST is calculated as a cooling determination value, and the difference ΔTw between the currently lowest indoor temperature Thomin and the set temperature ST is calculated as a heating determination value, and these are compared. As a result, when the cooling determination value ΔTc is larger than the heating determination value ΔTw, the operation mode is switched from heating to cooling.

As a result, in the cooling operation mode, as shown in FIG. 16B, the cooling operation is performed for the indoor unit whose indoor temperature Tho is equal to or higher than the third threshold value (ST-β) (see FIG. 8). The indoor temperature can be lowered by this, and for the indoor units that are equal to or less than the third threshold value (ST-β), the cooling standby operation is performed to prevent further temperature drop. It becomes possible. As a result, the variation in the indoor temperature between the indoor units can be reduced, and the indoor unit farthest from the set temperature ST can be brought closer to the set temperature ST earlier.
Also, the same effect can be obtained when the cooling operation mode is selected.

In the present embodiment, in step SD3 and step SD6 in FIG. 15, the difference ΔTc between the highest indoor temperature Thomax and the set temperature ST is compared with the difference ΔTw between the lowest indoor temperature Tmin and the set temperature ST. However, instead of this, the following method may be adopted.
That is, when there are a plurality of indoor units whose indoor temperature Tho is equal to or higher than the cooling switching threshold, all the indoor temperatures Tho that are equal to or higher than the cooling switching threshold are extracted, and the difference between the extracted indoor temperature Tho and the set temperature ST is calculated. Calculate each. Then, an integrated value ΣΔTc of the calculated difference ΔTc is obtained and used as a cooling determination value. Similarly, all the indoor temperatures Tho that are equal to or lower than the heating switching threshold are extracted, and the difference between these and the set temperature ST is calculated, and the calculated results are integrated to obtain an integrated value ΣΔTw, which is used as the heating determination value. To do. Then, by comparing the cooling determination value ΣΔTc and the heating determination value ΣΔTw, it is determined whether or not to switch the operation mode.

  According to such an operation control method, an indoor unit whose indoor temperature is equal to or higher than the cooling switching threshold value is detected, and in each detected indoor unit, a difference between the indoor temperature and the set temperature is calculated. Is integrated to calculate a cooling determination value that is a required degree of cooling operation. Similarly, an indoor unit whose indoor temperature is equal to or lower than the heating switching threshold is detected, and in each detected indoor unit, a difference between the indoor temperature and the set temperature is calculated, and further, the difference is integrated, thereby heating. A heating determination value that is a required degree of operation is calculated. Then, the cooling determination value and the heating determination value are compared, and the operation mode belonging to the larger value is selected. Thus, since the integrated value of the difference between the room temperature and the set temperature is used as the cooling determination value and the heating determination value, air conditioning that further reflects the indoor environment can be performed. Thereby, effective air conditioning can be realized and a more comfortable environment can be provided to the user.

In each of the above-described embodiments, processing by hardware is assumed, but it is not necessary to be limited to such a configuration. For example, a configuration in which software is separately processed based on output signals from each sensor is also possible.
In this case, the indoor control device CL2 includes a main storage device such as a CPU and a RAM, and a computer-readable recording medium on which a program for realizing all or part of the operation control method described above is recorded. .
The CPU reads out the program recorded in the storage medium and executes information processing / arithmetic processing, thereby realizing the same processing as that of the indoor control device CL2.
Here, the computer-readable recording medium means a magnetic disk, a magneto-optical disk, a CD-ROM, a DVD-ROM, a semiconductor memory, or the like. Alternatively, the computer program may be distributed to the computer via a communication line, and the computer that has received the distribution may execute the program.
In each of the above-described embodiments, the case where each control process is performed by the indoor control device CL2 has been described. Instead, for example, the outdoor control device CL1 (see FIG. 3), the remote controller 100a (FIG. 1). In addition, by mounting processing functions realized by the indoor control device CL2 on external devices other than these devices, the operation control methods according to the above-described embodiments can be realized also by these. good.

As mentioned above, although embodiment of this invention was explained in full detail with reference to drawings, the specific structure is not restricted to this embodiment, The design change etc. of the range which does not deviate from the summary of this invention are included.
For example, in the above-described embodiment, the case where the operation control method of the present invention is applied to the operation control of a plurality of indoor units connected to the same shunt controller in the air conditioning free multi air conditioner has been described. The operation control method of the type air conditioner is not limited to the above example, and can also be applied to a normal multi-type air conditioner that does not have a shunt controller. That is, the operation control method for the multi-type air conditioner according to the present embodiment is suitable as operation control for a plurality of indoor units that are connected to the same outdoor unit and are forced to operate in the same operation mode. It is.

It is a figure which shows the whole schematic structure of the air conditioning free multi air conditioner which concerns on one Embodiment of this invention. It is a figure which shows the whole schematic structure of the air conditioning free multi air conditioner which concerns on one Embodiment of this invention, and is the figure which showed the driving | running pattern of all the air_conditioning | cooling operation. It is the figure which showed the control block of the air conditioning free multi air conditioner concerning one Embodiment of this invention. It is the schematic block diagram which showed the cooling main operation | movement in the intermediate | middle period, and showed the operation pattern within the control range of the outdoor fan. It is the schematic block diagram which showed the driving | running pattern of all the heating all unit driving | operations. It is the schematic block diagram which showed the driving | running pattern of the heating main driving | operation in the intermediate period. It is the figure shown about the heating operation mode which concerns on one Embodiment of this invention. It is the figure shown about the cooling operation mode which concerns on one Embodiment of this invention. It is the figure which showed the operation control procedure about the automatic operation mode which concerns on one Embodiment of this invention. It is the figure which showed the effect at the time of implementing the operation control procedure about automatic operation mode shown in FIG. It is the figure which showed the operation control procedure about the automatic operation mode which concerns on other embodiment of this invention. It is the figure which showed the effect at the time of implementing the operation control procedure about automatic operation mode shown in FIG. It is the figure which showed the operation control procedure about the automatic operation mode which concerns on other embodiment of this invention. It is the figure which showed the effect at the time of implementing the operation control procedure about the automatic operation mode shown in FIG. It is the figure which showed the operation control procedure about the automatic operation mode which concerns on other embodiment of this invention. It is the figure which showed the effect at the time of implementing the operation control procedure about automatic operation mode shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Outdoor unit 3a thru | or 3g Indoor unit 5 High pressure gas pipe 7 Low pressure gas pipe 9 Liquid pipe 46a thru | or 46d Split flow controller 100 Remote control CL1 Outdoor control apparatus CL2 Indoor control apparatus

Claims (9)

When used in a multi-type air conditioner that includes an outdoor unit and a plurality of indoor units that are connected to the outdoor unit and operated in the same operation mode, when the automatic operation mode and the set temperature are set , An operation control method for a multi-type air conditioner that selectively selects a heating operation mode and a cooling operation mode, and performs operation control while switching the operation mode to be selected,
Acquiring each room temperature at each location where each indoor unit is installed;
When the heating operation mode is selected as the current operation mode, a process of detecting the number of indoor units whose indoor temperature is equal to or higher than a cooling switching threshold determined based on the set temperature;
A process of switching the current operation mode to the cooling operation mode when the detected number is equal to or greater than a predetermined number;
When the cooling operation mode is selected as the current operation mode, the number of indoor units whose room temperature is determined based on the set temperature and is lower than the heating switching threshold lower than the cooling switching threshold is The process of detecting,
A method of controlling the operation of a multi-type air conditioner, comprising: switching the current operation mode to the heating operation mode when the detected number is equal to or greater than a predetermined number. When used in a multi-type air conditioner that includes an outdoor unit and a plurality of indoor units that are connected to the outdoor unit and operated in the same operation mode, when the automatic operation mode and the set temperature are set , An operation control method for a multi-type air conditioner that selectively selects a heating operation mode and a cooling operation mode, and performs operation control while switching the operation mode to be selected,
Acquiring each room temperature at each location where each indoor unit is installed;
Detecting the number of indoor units in which the indoor temperature is equal to or higher than a cooling switching threshold determined based on the set temperature;
A step of detecting the number of indoor units, the indoor temperature being determined with reference to the set temperature and being equal to or less than a heating switching threshold that is smaller than the cooling switching threshold;
The number of indoor units whose indoor temperature is equal to or higher than the cooling switching threshold is compared with the number of indoor units whose indoor temperature is equal to or lower than the heating switching threshold, and according to the comparison result, the cooling operation mode and the A method for controlling the operation of a multi-type air conditioner, comprising: selecting one of heating operation modes. When used in a multi-type air conditioner that includes an outdoor unit and a plurality of indoor units that are connected to the outdoor unit and operated in the same operation mode, when the automatic operation mode and the set temperature are set , An operation control method for a multi-type air conditioner that selectively selects a heating operation mode and a cooling operation mode, and performs operation control while switching the operation mode to be selected,
Acquiring each room temperature at each location where each indoor unit is installed;
Calculating a difference between the lowest indoor temperature and the set temperature as a heating determination value;
Calculating a difference between the highest indoor temperature and the set temperature as a cooling determination value;
Selecting the heating operation mode when the heating determination value is larger than the cooling determination value, and selecting the cooling operation mode when the cooling determination value is larger than the heating determination value. Harmonic machine operation control method. A process of comparing each room temperature and a cooling switching threshold determined based on the set temperature,
A process of comparing each room temperature with a heating switching threshold that is determined with reference to the set temperature and is smaller than the cooling switching threshold;
The operation of the multi-type air conditioner according to claim 3, wherein when all the indoor temperatures are not less than the heating switching threshold and not more than the cooling switching threshold, the currently selected operation mode is maintained. Control method. When used in a multi-type air conditioner that includes an outdoor unit and a plurality of indoor units that are connected to the outdoor unit and operated in the same operation mode, when the automatic operation mode and the set temperature are set , An operation control method for a multi-type air conditioner that selectively selects a heating operation mode and a cooling operation mode, and performs operation control while switching the operation mode to be selected,
Acquiring each room temperature at each location where each indoor unit is installed;
A process of comparing each room temperature and a cooling switching threshold determined based on the set temperature,
A process of comparing each room temperature with a heating switching threshold that is determined with reference to the set temperature and is smaller than the cooling switching threshold;
The difference between the indoor temperature that is not more than the heating switching threshold and the set temperature when there is at least one of the indoor temperature that is not more than the heating switching threshold and the indoor temperature that is not less than the cooling switching threshold And further calculating the heating determination value by integrating the difference, and
The difference between the indoor temperature that is equal to or higher than the cooling switching threshold and the set temperature when at least one of the indoor temperature that is equal to or lower than the heating switching threshold and the indoor temperature that is equal to or higher than the cooling switching threshold exists. And further calculating the cooling determination value by integrating the difference,
Selecting a heating operation mode when the heating determination value is larger than the cooling determination value, and selecting a cooling operation mode when the cooling determination value is larger than the heating determination value. Operation control method. When used in a multi-type air conditioner that includes an outdoor unit and a plurality of indoor units that are connected to the outdoor unit and operated in the same operation mode, when the automatic operation mode and the set temperature are set An operation control program for a multi-type air conditioner for selectively selecting a heating operation mode and a cooling operation mode, and performing operation control while switching the operation mode to be selected,
Obtaining each room temperature of each place where each said indoor unit is installed;
When the heating operation mode is selected as the current operation mode, detecting the number of indoor units whose indoor temperature is equal to or higher than a cooling switching threshold determined based on the set temperature;
A step of switching the current operation mode to the cooling operation mode when the detected number is equal to or greater than a predetermined number;
When the cooling operation mode is selected as the current operation mode, the number of indoor units whose room temperature is determined based on the set temperature and is lower than the heating switching threshold lower than the cooling switching threshold is Detecting step;
A multi-type air conditioner operation control program for causing a computer to execute a step of switching the current operation mode to the heating operation mode when the detected number is equal to or greater than a predetermined number. When used in a multi-type air conditioner that includes an outdoor unit and a plurality of indoor units that are connected to the outdoor unit and operated in the same operation mode, when the automatic operation mode and the set temperature are set An operation control program for a multi-type air conditioner for selectively selecting a heating operation mode and a cooling operation mode, and performing operation control while switching the operation mode to be selected,
Obtaining each room temperature of each place where each said indoor unit is installed;
Detecting the number of indoor units in which the room temperature is equal to or higher than a cooling switching threshold determined based on the set temperature;
Detecting the number of indoor units whose indoor temperature is not more than a heating switching threshold that is determined based on the set temperature and is smaller than the cooling switching threshold; and
The number of indoor units whose indoor temperature is equal to or higher than the cooling switching threshold is compared with the number of indoor units whose indoor temperature is equal to or lower than the heating switching threshold, and according to the comparison result, the cooling operation mode and the An operation control program for a multi-type air conditioner for causing a computer to execute the step of selecting one of the heating operation modes. When used in a multi-type air conditioner that includes an outdoor unit and a plurality of indoor units that are connected to the outdoor unit and operated in the same operation mode, when the automatic operation mode and the set temperature are set An operation control program for a multi-type air conditioner for selectively selecting a heating operation mode and a cooling operation mode, and performing operation control while switching the operation mode to be selected,
Obtaining each room temperature of each place where each said indoor unit is installed;
Calculating a difference between the lowest indoor temperature and the set temperature as a heating determination value;
Calculating a difference between the highest indoor temperature and the set temperature as a cooling determination value;
Selecting the heating operation mode when the heating determination value is larger than the cooling determination value, and selecting the cooling operation mode when the cooling determination value is larger than the heating determination value. Operation control program for multi-type air conditioner. When used in a multi-type air conditioner that includes an outdoor unit and a plurality of indoor units that are connected to the outdoor unit and operated in the same operation mode, when the automatic operation mode and the set temperature are set An operation control program for a multi-type air conditioner for selectively selecting a heating operation mode and a cooling operation mode, and performing operation control while switching the operation mode to be selected,
Obtaining each room temperature of each place where each said indoor unit is installed;
Comparing each of the room temperature and a cooling switching threshold determined based on the set temperature,
Comparing each of the room temperatures with a heating switching threshold value that is determined on the basis of the set temperature and that is smaller than the cooling switching threshold value;
The difference between the indoor temperature that is not more than the heating switching threshold and the set temperature when there is at least one of the indoor temperature that is not more than the heating switching threshold and the indoor temperature that is not less than the cooling switching threshold And further calculating the heating determination value by integrating the difference, and
The difference between the indoor temperature that is equal to or higher than the cooling switching threshold and the set temperature when at least one of the indoor temperature that is equal to or lower than the heating switching threshold and the indoor temperature that is equal to or higher than the cooling switching threshold exists. And further calculating the cooling determination value by integrating the difference, and
Selecting the heating operation mode when the heating determination value is larger than the cooling determination value, and selecting the cooling operation mode when the cooling determination value is larger than the heating determination value. Multi-type air conditioner operation control program.

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