JP7693031B2 - Air Conditioning System - Google Patents

Description

The present disclosure relates to an air conditioning system equipped with an auxiliary heater to compensate for the lack of heating capacity due to the refrigeration cycle.

Conventionally, air conditioners are known that are equipped with a heater for auxiliary heating to compensate for the lack of heating capacity due to the refrigeration cycle. For example, Patent Document 1 discloses an air conditioner that includes a heater built into the indoor unit or a heater provided outside the indoor unit for auxiliary heating, and an indoor temperature detector that is provided in the indoor unit and detects the indoor temperature in the air-conditioned area, and that controls the compressor rotation speed and the heater operation and stopping based on the indoor temperature detected by the indoor temperature detector.

JP 2015-210048 A

However, in the air conditioner described in Patent Document 1, the heater is controlled based on the indoor temperature detected by an indoor temperature detector provided in the indoor unit. Therefore, if the indoor temperature detector breaks down and is unable to obtain the indoor temperature, the air conditioner described in Patent Document 1 has the problem that it cannot control the heater appropriately, and there is a risk that the indoor temperature will drop below the set temperature.

The present disclosure has been made in consideration of the above, and aims to provide an air conditioning system that is equipped with an external heater for auxiliary heating and can appropriately control the external heater even if an indoor temperature detection unit provided in the indoor unit of the air conditioner fails.

In order to solve the above-mentioned problems and achieve the object, the air conditioning system according to the present disclosure includes an air conditioner having a refrigeration cycle in which an indoor unit provided in a room that is an air-conditioned area and an outdoor unit provided outdoors are connected by a refrigerant pipe that circulates a refrigerant. The air conditioning system includes an external heater provided in the room, an external indoor temperature detection unit provided outside the indoor unit in the room and detecting an external detected indoor temperature that is the indoor temperature of the room detected outside the indoor unit, and a communication relay unit that relays communication between the external indoor temperature detection unit and the indoor unit. The indoor unit has an internal indoor temperature detection unit that detects an internal detected indoor temperature that is the indoor temperature of the room detected in the indoor unit, an operation determination unit that determines whether the internal indoor temperature detection unit is operating normally, and a heater control unit that controls the external heater based on the internal detected indoor temperature when it is determined that the internal indoor temperature detection unit is operating normally, and controls the external heater based on the external detected indoor temperature acquired from the external indoor temperature detection unit via the communication relay unit when it is determined that the internal indoor temperature detection unit is not operating normally. The operation determination unit determines whether the external indoor temperature detection unit is operating normally when it is determined that the internal indoor temperature detection unit is not operating normally. The heater control unit controls the external heater based on a corrected indoor temperature obtained by correcting the external detected indoor temperature based on a predetermined correction value when it is determined that the internal indoor temperature detection unit is not operating normally and further determined that the external indoor temperature detection unit is operating normally.

The air conditioning system disclosed herein has an external heater for auxiliary heating, and has the advantage of being able to appropriately control the external heater even if the indoor temperature detection unit installed in the indoor unit of the air conditioner fails.

FIG. 1 is a schematic diagram showing a configuration of an air conditioning system according to a first embodiment. A refrigerant circuit diagram showing a refrigeration cycle of an air conditioning system according to a first embodiment. A functional block diagram showing a functional configuration of an air conditioning system according to a first embodiment. FIG. 1 is a block diagram showing a functional configuration of an indoor unit of an air conditioner according to a first embodiment. FIG. 1 is a block diagram showing a functional configuration of a remote controller for an air conditioner according to a first embodiment. FIG. 1 is a block diagram showing a functional configuration of an external heater according to a first embodiment; FIG. 1 is a block diagram showing a functional configuration of an external indoor temperature sensor according to a first embodiment; 1 is a flowchart showing the procedure of the operation of the air conditioning system according to the first embodiment. A functional block diagram showing a functional configuration of an air conditioning system according to a second embodiment. 11 is a flowchart showing the procedure of the operation of the air conditioning system according to the second embodiment. FIG. 1 is a diagram showing a configuration in which each function of a control unit according to a first embodiment is realized by hardware. FIG. 1 is a diagram showing a configuration in which each function of a control unit according to a first embodiment is realized by software.

Below, the air conditioning system according to the embodiment is described in detail with reference to the drawings.

Embodiment 1.
Fig. 1 is a configuration diagram showing a schematic configuration of an air conditioning system 100 according to embodiment 1. Fig. 2 is a refrigerant circuit diagram showing a refrigeration cycle of the air conditioning system 100 according to embodiment 1. Fig. 3 is a functional block diagram showing a functional configuration of the air conditioning system 100 according to embodiment 1.

1 and 3, the air conditioning system 100 according to the first embodiment includes an air conditioner 10 having an indoor unit 11 installed indoors and an outdoor unit 12 installed outdoors, a refrigerant pipe 14 for circulating a refrigerant between the indoor unit 11 and the outdoor unit 12, a remote controller 13 for transmitting control instructions to the indoor unit 11 for the air conditioner 10, an external heater 15 installed indoors, an external indoor temperature sensor 16 for detecting the indoor temperature, which is the temperature of the indoor air, which is the air inside the room, and a wireless repeater 17 for relaying communication between the indoor unit 11 and the external indoor temperature sensor 16. The outdoor unit 12 is capable of communicating with the indoor unit 11 via a communication line (not shown). Hereinafter, the remote controller may be referred to as a remote control.

The air conditioner 10 forms one complete refrigeration cycle with the indoor unit 11 and the outdoor unit 12. The air conditioner 10 uses the refrigerant circulating between the indoor unit 11 and the outdoor unit 12 through the refrigerant pipe 14 to transfer heat between the air inside the room, which is the area to be air-conditioned, and the air outside the room, thereby realizing air conditioning for the room. That is, the indoor unit 11 and the outdoor unit 12 are connected by the refrigerant pipe 14, and the pressure of the refrigerant flowing through the refrigerant pipe 14 is changed by the compressor 1, which will be described later, provided in the outdoor unit 12, to perform air conditioning by absorbing and releasing heat from the refrigerant.

As shown in Fig. 2, the indoor unit 11 is equipped with an indoor heat exchanger 4 that constitutes a refrigeration cycle. Also, as shown in Fig. 2, the outdoor unit 12 is equipped with a compressor 1, an outdoor heat exchanger 2, an expansion valve 3, a four-way valve 5, and an outdoor air temperature sensor 6 that constitute a refrigeration cycle. The refrigeration cycle of the air conditioner 10 is formed by sequentially connecting the compressor 1, the four-way valve 5, the outdoor heat exchanger 2, the expansion valve 3, and the indoor heat exchanger 4 by refrigerant pipes 14. The indoor unit 11 and the outdoor unit 12 are also connected to each other by communication lines (not shown).

An external heater 15 is connected to the indoor unit 11 to assist the heating of the air conditioner 10. Here, the external heater 15 is an external heater that is provided outside the air conditioner 10 and independent of the air conditioner 10, in the room that is the area to be air-conditioned. In other words, the indoor unit 11 has a configuration that allows the external heater 15 to be connected.

An outdoor air temperature sensor 6 is attached to the outdoor unit 12 as an outdoor air temperature detector. The outdoor air temperature sensor 6 detects the outdoor air temperature as the temperature of the outdoor air. Information on the outdoor air temperature detected by the outdoor air temperature sensor 6 is transmitted to the air conditioning control unit 118 described later.

The four-way valve 5 is a valve for switching the direction of refrigerant flow. During heating operation, the four-way valve 5 connects the discharge side of the compressor 1 to the indoor heat exchanger 4, and sets the refrigerant flow path to connect the suction side of the compressor 1 to the outdoor heat exchanger 2. During heating operation, the indoor heat exchanger 4 functions as a refrigerant condenser and heats the air in the room.

In the refrigerant circuit configured in this manner, during heating operation, the refrigerant circulates through the path indicated by the solid arrows in Figure 2.

During heating operation, the high-temperature, high-pressure refrigerant discharged from the compressor 1 passes through the four-way valve 5 and flows into the indoor heat exchanger 4 mounted in the indoor unit 11. Here, the refrigerant that flows into the indoor heat exchanger 4 condenses by exchanging heat with the air drawn in by the indoor unit 11. The refrigerant that flows out of the indoor heat exchanger 4 expands in the expansion valve 3 and flows into the outdoor heat exchanger 2 in a low-temperature, low-pressure state. Here, the refrigerant that flows into the outdoor heat exchanger 2 evaporates by exchanging heat with the air drawn in by the outdoor unit 12, passes through the four-way valve 5, and is drawn back into the compressor 1.

Figure 4 is a block diagram showing the functional configuration of the indoor unit 11 of the air conditioner 10 according to embodiment 1. The indoor unit 11 has an indoor unit air conditioning unit 111, an indoor unit blower 112, an internal room temperature sensor 113, an operation determination unit 114, a heater control unit 115, an indoor unit memory unit 116, an indoor unit communication unit 117, and an air conditioning control unit 118.

The indoor unit air conditioning section 111 has the air conditioning function of a typical indoor unit of an air conditioner. The indoor unit air conditioning section 111 is equipped with an indoor heat exchanger 4 that exchanges heat between the air taken in by the indoor unit 11 and the refrigerant flowing in the refrigerant circuit, a blower fan that sends the conditioned air that has been heat exchanged in the indoor heat exchanger 4 from the indoor unit 11 to the room, and an air direction adjustment section that adjusts the direction in which the conditioned air is sent out from the indoor unit 11. The air taken in by the indoor unit 11 is the indoor air of the room in which the indoor unit 11 is installed.

The indoor unit blower 112 forms an airflow that passes through the indoor heat exchanger 4. That is, the indoor unit blower 112 forms an airflow that takes in indoor air from the room to the indoor heat exchanger 4, that is, an airflow that supplies indoor air to the indoor heat exchanger 4.

The internal indoor temperature sensor 113 is built into the indoor unit 11 and is an internal indoor temperature detection unit that detects the indoor temperature, which is the temperature of the indoor air, which is the air inside the room that is the area to be air-conditioned, inside the air conditioner 10 at a predetermined period. The internal indoor temperature sensor 113 transmits information on the detected indoor temperature to the air conditioning control unit 118. The indoor temperature detected by the internal indoor temperature sensor 113 is the internal detected indoor temperature, which is the indoor temperature detected in the indoor unit 11.

The operation determination unit 114 determines whether the internal indoor temperature sensor 113 is operating normally based on information on the first indoor temperature Ta, which is the indoor temperature detected by the internal indoor temperature sensor 113. The operation determination unit 114 determines whether the internal indoor temperature sensor 113 is operating normally by comparing the first indoor temperature Ta acquired from the internal indoor temperature sensor 113 with a predetermined normal range of indoor temperatures.

The normal range of indoor temperatures is a temperature threshold range for the operation determination unit 114 to determine whether the internal indoor temperature sensor 113 is normal or not by comparing it with the first indoor temperature Ta indicated in the information on the first indoor temperature Ta, and is the range of indoor temperatures detected by the internal indoor temperature sensor 113 when the internal indoor temperature sensor 113 is operating normally. Information on the normal range of indoor temperatures is determined in advance and stored in the operation determination unit 114. Note that information on the normal range of indoor temperatures may be stored in the indoor unit memory unit 116.

In addition, the operation determination unit 114 determines whether the second indoor temperature Tb, which is the indoor temperature detected by the external indoor temperature sensor 16, is a normal value. The operation determination unit 114 determines whether the second indoor temperature Tb is a normal value by comparing the second indoor temperature Tb indicated in the information on the second indoor temperature Tb acquired from the external indoor temperature sensor 16 with the normal range of the indoor temperature described above.

The heater control unit 115 controls the external heater 15 based on the result of the determination by the operation determination unit 114 as to whether or not the internal indoor temperature sensor 113 is operating normally. In other words, when the air conditioning control unit 118 is controlling the heating operation of the air conditioner 10, the heater control unit 115 controls the operation of the external heater 15 based on the result of the determination as to whether or not the internal indoor temperature sensor 113 is operating normally.

When the operation determination unit 114 determines that the internal indoor temperature sensor 113 is operating normally, the heater control unit 115 controls the operation of the external heater 15 based on the first indoor temperature Ta, which is the indoor temperature detected by the internal indoor temperature sensor 113. When the operation determination unit 114 determines that the internal indoor temperature sensor 113 is not operating normally, the heater control unit 115 controls the operation of the external heater 15 based on the second indoor temperature Tb, which is the indoor temperature detected by the external indoor temperature sensor 16.

In addition, the heater control unit 115 corrects the second indoor temperature Tb based on the tendency of the error between the first indoor temperature Ta and the second indoor temperature Tb to calculate the corrected indoor temperature T_hosei. The corrected indoor temperature T_hosei is a correction value of the indoor temperature used to control the operation of the external heater 15 in order to suppress or eliminate the influence of the error between the first indoor temperature Ta and the second indoor temperature Tb and control the operation of the external heater 15 when the heater control unit 115 controls the operation of the external heater 15 based on the second indoor temperature Tb.

The indoor unit memory unit 116 is a memory unit that stores information such as various control setting values and programs for controlling the operation of the air conditioner 10. The indoor unit memory unit 116 is a non-volatile memory unit and is composed of a semiconductor storage medium such as a flash memory.

The indoor unit communication unit 117 communicates with an external communication unit, which is a communication unit provided in each component other than the air conditioner 10 in the air conditioning system 100. That is, the indoor unit communication unit 117 communicates with a remote control communication unit 134 (described later) of the remote control 13, a communication unit (not shown) of the outdoor unit 12, and an external heater communication unit 152 (described later) of the external heater 15. The indoor unit communication unit 117 transmits information received from the external communication unit to the air conditioning control unit 118. The communication method between the external communication unit and the indoor unit communication unit 117 may be wired communication, or wireless communication using Wi-Fi (registered trademark) (Wireless Fidelity) or Bluetooth (registered trademark), etc.

The air conditioning control unit 118 is a control unit that controls the overall operation of the air conditioner 10, and controls the operation of the indoor unit 11 and the outdoor unit 12 to control the operation of the air conditioner 10. In other words, the air conditioning control unit 118 operates the compressor 1 provided in the outdoor unit 12 based on the set temperature set in the air conditioning control unit 118, the indoor temperature, and the outdoor temperature, to perform cooling or heating operation.

The remote control 13 is an operating device for the air conditioner 10 that transmits control instruction information for the air conditioner 10 to the indoor unit 11 to control the operation of the air conditioner 10. FIG. 5 is a block diagram showing the functional configuration of the remote controller 13 of the air conditioner 10 according to the first embodiment. The remote control 13 comprises a remote controller operating unit 131, a remote controller display unit 132, a remote controller memory unit 133, a remote controller communication unit 134, and a remote controller control unit 135. Each of the components of the remote control 13 described above is capable of transmitting and receiving information to and from each other.

The remote control operation unit 131 accepts setting operations related to air conditioning of the air conditioner 10 requested by the user. In other words, the remote control operation unit 131 is an interface for remotely controlling the operation of the air conditioner 10, and accepts operations related to the operation of the air conditioner 10 from the user. When the remote control operation unit 131 accepts an operation from the user, it outputs information corresponding to the user's operation to the remote control control unit 135 as operation information.

The remote control operation unit 131 is configured to allow the user to arbitrarily select various functions related to the air conditioning operation of the air conditioner 10, such as starting the operation of the air conditioner 10, stopping the operation of the air conditioner 10, selecting the operation mode of the air conditioner 10 including automatic wind direction tracking control, changing the set temperature, changing the set humidity, setting the air volume, setting the wind direction, and changing the settings of prohibited operations. Selection of the operation mode of the air conditioner 10 includes selection of the external heater heating operation mode, which is a heating operation operation mode that uses the external heater 15 based on the set temperature and indoor temperature set by the user, and selection of the normal heating operation mode, which is a heating operation operation mode that does not use the external heater 15.

The remote control display unit 132 is a display unit that displays various information, and displays information and status required for air conditioning by the air conditioner 10, such as the set temperature and operation mode of the air conditioner 10, and switches and displays screens corresponding to operations on the remote control operation unit 131.

The remote control memory unit 133 stores various information necessary for air conditioning processing in the air conditioner 10, and temporarily or long-term stores information such as the setting contents to be displayed on the remote control display unit 132 and image data related to the setting contents.

The remote control communication unit 134 is capable of bidirectional communication of information with the indoor unit communication unit 117 of the indoor unit 11. Note that communication with the indoor unit communication unit 117 may be wireless communication or wired communication.

The remote control control unit 135 controls the operation of the entire remote control 13. The remote control control unit 135 controls the remote control 13 based on operation information transmitted from the remote control operation unit 131. The remote control control unit 135 also transmits the operation information transmitted from the remote control operation unit 131 to the air conditioning control unit 118 of the indoor unit 11. The remote control control unit 135 has a clock function.

The external heater 15 is an auxiliary heater for heating to compensate for the lack of heating capacity due to the refrigeration cycle in the air conditioner 10. The external heater 15 is provided outside the indoor unit 11 in the room, which is the area to be air-conditioned by the air conditioner 10. FIG. 6 is a block diagram showing the functional configuration of the external heater 15 according to the first embodiment. The external heater 15 comprises a heater unit 151, an external heater communication unit 152, and an external heater control unit 153. The components of the external heater 15 can exchange information with each other.

The heater section 151 has a heating function to heat the air.

The external heater communication unit 152 communicates with the indoor unit communication unit 117 of the indoor unit 11.

The external heater control unit 153 is a control unit that controls the overall operation of the external heater 15. The external heater control unit 153 controls the operation of the heater unit 151 in accordance with the control of the indoor unit 11.

The external indoor temperature sensor 16 is arranged outside the air conditioner 10 indoors, and is an external indoor temperature detection unit that detects the indoor temperature, which is the temperature of the indoor air, which is the air inside the room, which is the area to be air-conditioned, outside the air conditioner 10 at a predetermined period. The external indoor temperature sensor 16 is provided outside the indoor unit 11 in the room, which is the area to be air-conditioned by the air conditioner 10. The external indoor temperature sensor 16 transmits information on the detected indoor temperature to the air conditioning control unit 118. The indoor temperature detected by the external indoor temperature sensor 16 is the external detected indoor temperature, which is the indoor temperature detected outside the indoor unit 11.

Figure 7 is a block diagram showing the functional configuration of the external indoor temperature sensor 16 according to embodiment 1. The external indoor temperature sensor 16 has an external sensor detection unit 161 and an external sensor communication unit 162.

The external sensor detection unit 161 detects the indoor temperature, which is the temperature of the indoor air in the area to be air-conditioned, at a predetermined period.

The external sensor communication unit 162 performs wireless communication with the wireless repeater 17. The external sensor communication unit 162 transmits information on the indoor temperature detected by the external sensor detection unit 161 to the wireless repeater 17, and transmits the information on the indoor temperature via the wireless repeater 17 to the indoor unit communication unit 117 of the indoor unit 11.

The wireless repeater 17 is a communication repeater that relays communication between the external sensor communication unit 162 of the external indoor temperature sensor 16 and the indoor unit communication unit 117 of the indoor unit 11 by wireless communication. The wireless repeater 17 receives indoor temperature information transmitted from the external sensor communication unit 162 and transmits the indoor temperature information to the indoor unit communication unit 117. Note that a communication repeater that relays communication between the external sensor communication unit 162 of the external indoor temperature sensor 16 and the indoor unit communication unit 117 of the indoor unit 11 by wired communication may be used instead of the wireless repeater 17.

Next, the operation of the air conditioning system 100 according to the first embodiment will be described. Figure 8 is a flowchart showing the procedure for the operation of the air conditioning system 100 according to the first embodiment.

In step S110, information on the first indoor temperature Ta, which is the indoor temperature detected by the internal indoor temperature sensor 113, is acquired by the operation determination unit 114. Specifically, the operation determination unit 114 acquires information on the first indoor temperature Ta, which is information on the indoor temperature detected by the internal indoor temperature sensor 113, from the internal indoor temperature sensor 113. The information on the first indoor temperature Ta can be said to be information on the internal detected indoor temperature acquired by the internal indoor temperature sensor 113.

The internal indoor temperature sensor 113 detects the indoor temperature, which is the temperature of the indoor air, which is the air inside the room that is the air-conditioning target area, at a predetermined period. The internal indoor temperature sensor 113 transmits information on the detected indoor temperature, a first indoor temperature Ta, to the air conditioning control unit 118. When the air conditioning control unit 118 receives the information on the first indoor temperature Ta transmitted from the internal indoor temperature sensor 113, it transmits the information on the first indoor temperature Ta to the operation determination unit 114. The operation determination unit 114 acquires the information on the first indoor temperature Ta by receiving the information on the first indoor temperature Ta transmitted from the air conditioning control unit 118.

In step S120, it is determined whether the internal indoor temperature sensor 113 is normal. Specifically, the operation determination unit 114 determines whether the internal indoor temperature sensor 113 is normal. The operation determination unit 114 determines whether the internal indoor temperature sensor 113 is normal by comparing the first indoor temperature Ta indicated in the information on the first indoor temperature Ta acquired from the internal indoor temperature sensor 113 with a predetermined normal range of indoor temperatures.

The operation determination unit 114, for example, compares the first indoor temperature Ta with the lower limit of the normal range of indoor temperatures and the upper limit of the normal range of indoor temperatures, and determines whether "lower limit of the normal range of indoor temperatures ≦ first indoor temperature Ta ≦ upper limit of the normal range of indoor temperatures".

When the first indoor temperature Ta is outside the normal range of indoor temperatures, the operation determination unit 114 determines that the internal indoor temperature sensor 113 is not operating normally and determines that the internal indoor temperature sensor 113 is not normal.

When the first indoor temperature Ta is within the normal range of indoor temperatures, the operation determination unit 114 determines that the internal indoor temperature sensor 113 is operating normally and determines that the internal indoor temperature sensor 113 is normal. When the operation determination unit 114 determines that the internal indoor temperature sensor 113 is normal, it transmits sensor normality determination information indicating that the internal indoor temperature sensor 113 is normal and information on the first indoor temperature Ta to the heater control unit 115 and the air conditioning control unit 118. The heater control unit 115 and the air conditioning control unit 118 receive the sensor normality determination information and information on the first indoor temperature Ta transmitted from the operation determination unit 114.

If it is determined that the internal room temperature sensor 113 is normal, the answer is Yes in step S120 and the process proceeds to step S130. If it is determined that the internal room temperature sensor 113 is not normal, the answer is No in step S120 and the process proceeds to step S150.

In step S130, it is determined whether an external heater ON condition, which is a condition for turning on the external heater 15, is satisfied. Specifically, the heater control unit 115 determines whether the external heater ON condition is satisfied.

Examples of the external heater on condition include a number of detailed external heater on conditions, such as the air conditioner 10 being in heating operation, the air conditioner 10 being in heating operation in external heater heating operation mode, and the temperature difference between the set temperature of the heating operation and the room temperature being equal to or greater than a predetermined temperature difference set value. The detailed external heater on conditions are determined in advance and stored in the heater control unit 115. The detailed external heater on conditions may also be stored in the indoor unit memory unit 116.

Here, when the process proceeds from step S120 to step S130, the detailed external heater on condition described above, "the temperature difference between the set temperature for heating operation and the indoor temperature is equal to or greater than a predetermined temperature difference set value," is changed to the detailed external heater on condition, "the temperature difference between the set temperature for heating operation and the first indoor temperature Ta is equal to or greater than a predetermined temperature difference set value."

The temperature difference setting value is a temperature difference threshold that the heater control unit 115 uses to determine whether the external heater on condition is met by comparing the temperature difference between the heating operation set temperature and the indoor temperature.

The heater control unit 115 can determine whether the air conditioner 10 is currently in heating operation by acquiring information on the current operation mode of the air conditioner 10 from the air conditioning control unit 118. The heater control unit 115 can also acquire information on the set temperature of the current heating operation of the air conditioner 10 from the air conditioning control unit 118, and calculate the temperature difference between the set temperature and the first indoor temperature Ta by comparing the set temperature information with the first indoor temperature Ta. The heater control unit 115 can then determine whether the temperature difference between the set temperature of the heating operation and the first indoor temperature Ta is equal to or greater than a predetermined temperature difference set value by comparing the calculated temperature difference with the temperature difference set value.

When the heater control unit 115 determines that all of the multiple detailed external heater on conditions are satisfied, it determines that the external heater on condition is satisfied. When the heater control unit 115 determines that any of the multiple detailed external heater on conditions is not satisfied, it determines that the external heater on condition is not satisfied.

If it is determined that the external heater ON condition is satisfied, the answer is Yes in step S130 and the process proceeds to step S140. If it is determined that the external heater ON condition is not satisfied, the answer is No in step S130 and the process proceeds to step S180.

In step S140, the external heater 15 is turned on. Specifically, the heater control unit 115 turns on the external heater 15 to operate the external heater 15. This completes a series of processes for controlling the external heater 15.

In step S180, the external heater 15 is turned off. Specifically, the heater control unit 115 turns off the external heater 15 to stop the external heater 15. Note that if the external heater 15 has already been turned off, control to turn off the external heater 15 is not performed, and the series of processes for controlling the external heater 15 is terminated.

In step S150, information on the second indoor temperature Tb, which is the indoor temperature detected by the external indoor temperature sensor 16, is acquired by the operation determination unit 114. Specifically, the operation determination unit 114 acquires information on the second indoor temperature Tb, which is information on the indoor temperature detected by the external indoor temperature sensor 16, from the external indoor temperature sensor 16. The information on the second indoor temperature Tb can be said to be information on the external detected indoor temperature acquired by the external indoor temperature sensor 16.

The external indoor temperature sensor 16 detects the indoor temperature, which is the temperature of the indoor air, at a predetermined cycle. The external indoor temperature sensor 16 transmits information on the detected indoor temperature, the second indoor temperature Tb, to the air conditioning control unit 118 of the indoor unit 11 via the wireless repeater 17. That is, the external sensor detection unit 161 of the external indoor temperature sensor 16 detects the indoor temperature of the room, which is the air conditioning target area, at a predetermined cycle. The external sensor communication unit 162 of the external indoor temperature sensor 16 transmits information on the second indoor temperature Tb, which is information on the indoor temperature detected by the external sensor detection unit 161, to the wireless repeater 17.

When the wireless repeater 17 receives information on the second indoor temperature Tb transmitted from the external sensor communication unit 162, it transmits the information on the second indoor temperature Tb to the indoor unit communication unit 117 of the indoor unit 11. When the indoor unit communication unit 117 receives information on the second indoor temperature Tb transmitted from the wireless repeater 17, it transmits the information on the second indoor temperature Tb to the air conditioning control unit 118. When the air conditioning control unit 118 receives information on the second indoor temperature Tb transmitted from the indoor unit communication unit 117, it transmits the information on the second indoor temperature Tb to the operation determination unit 114. The operation determination unit 114 acquires information on the second indoor temperature Tb by receiving the information on the second indoor temperature Tb transmitted from the air conditioning control unit 118.

In step S160, it is determined whether the second indoor temperature Tb is a normal value. Specifically, the operation determination unit 114 determines whether the second indoor temperature Tb is a normal value. The operation determination unit 114 determines whether the second indoor temperature Tb is a normal value by comparing the second indoor temperature Tb indicated in the information on the second indoor temperature Tb acquired from the external indoor temperature sensor 16 with a predetermined normal range of indoor temperatures. The normal range of indoor temperatures is the same temperature range as the normal range of indoor temperatures in step S120 described above. In addition, the determination of whether the second indoor temperature Tb is a normal value can be made in the same manner as in step S120 described above.

The operation determination unit 114 determines that the second indoor temperature Tb is not a normal value when the second indoor temperature Tb is outside the normal range of indoor temperatures.

The operation determination unit 114 determines that the second indoor temperature Tb is a normal value when the second indoor temperature Tb is within the normal range of indoor temperatures. When the operation determination unit 114 determines that the second indoor temperature Tb is a normal value, it transmits temperature normality determination information indicating that the second indoor temperature Tb is normal and information on the second indoor temperature Tb to the heater control unit 115 and the air conditioning control unit 118. The heater control unit 115 and the air conditioning control unit 118 receive the temperature normality determination information and information on the second indoor temperature Tb transmitted from the operation determination unit 114.

If it is determined that the second room temperature Tb is a normal value, i.e., if it is determined that the second room temperature Tb indicated in the information on the second room temperature Tb is a normal value, the answer is Yes in step S160 and the process proceeds to step S170. If it is determined that the second room temperature Tb is not a normal value, i.e., if it is determined that the second room temperature Tb indicated in the information on the second room temperature Tb is not a normal value, the answer is No in step S160 and the process proceeds to step S180.

In step S170, the corrected indoor temperature T_hosei is calculated by correcting the second indoor temperature Tb. Specifically, the heater control unit 115 corrects the second indoor temperature Tb indicated in the information on the second indoor temperature Tb to calculate the corrected indoor temperature T_hosei. The heater control unit 115 adds a correction value γ, which is determined in advance based on the tendency of the error between the first indoor temperature Ta and the second indoor temperature Tb, to the second indoor temperature Tb to calculate the corrected indoor temperature T_hosei.

The corrected indoor temperature T_hosei is the indoor temperature obtained by correcting the indoor temperature indicated by the second indoor temperature Tb, taking into account the tendency of the error between the first indoor temperature Ta and the second indoor temperature Tb. The corrected indoor temperature T_hosei is indoor temperature information corrected to bring the second indoor temperature Tb closer to the first indoor temperature Ta at the same time that the indoor temperature is detected by the external indoor temperature sensor 16 when the internal indoor temperature sensor 113 is operating normally.

The correction value γ is a correction value added to the second indoor temperature Tb to correct the second indoor temperature Tb and calculate the corrected indoor temperature T_hosei. The correction value γ is determined in advance based on a combination of indoor temperatures, each consisting of an indoor temperature detected by the external indoor temperature sensor 16 and an indoor temperature detected by the internal indoor temperature sensor 113, which are detected at the same time, and is stored in the heater control unit 115. The information on the correction value γ may be stored in the indoor unit memory unit 116.

For example, assume that the second room temperature Tb tends to be detected as a temperature γ lower than the first room temperature Ta. In this case, the heater control unit 115 calculates the second room temperature Tb + correction value γ to calculate the corrected room temperature T_hosei in order to bring the room temperature indicated by the second room temperature Tb closer to the room temperature that would be indicated by the first room temperature Ta at the same time that the room temperature is detected by the external room temperature sensor 16 if the internal room temperature sensor 113 is operating normally.

After calculating the corrected indoor temperature T_hosei, the operation determination unit 114 transmits the corrected indoor temperature T_hosei to the heater control unit 115 and the air conditioning control unit 118. The heater control unit 115 and the air conditioning control unit 118 receive the corrected indoor temperature T_hosei transmitted from the operation determination unit 114.

After the calculation of the corrected indoor temperature T_hosei, the process proceeds to step S130. In step S130, as described above, it is determined whether the external heater on condition, which is the condition for turning on the external heater 15, is satisfied. If the process proceeds from step S170 to step S130, the information on the corrected indoor temperature T_hosei is used in place of the information on the first indoor temperature Ta in the determination in step S130 in the process in step S130 described above.

For example, the detailed external heater on condition shown in step S130 above, "the temperature difference between the set temperature for heating operation and the indoor temperature is equal to or greater than a predetermined temperature difference set value," is changed to the detailed external heater on condition, "the temperature difference between the set temperature for heating operation and the corrected indoor temperature T_hosei is equal to or greater than a predetermined temperature difference set value."

The above-mentioned series of processes is performed at a predetermined period during operation of a predetermined air conditioner 10.

As described above, the air conditioning system 100 according to the first embodiment includes an internal indoor temperature sensor 113 and an external indoor temperature sensor 16 built into the indoor unit 11 as indoor temperature sensors for detecting the indoor temperature of the area to be air-conditioned. The indoor unit 11 is capable of acquiring information on the second indoor temperature Tb, which is information on the indoor temperature detected by the external indoor temperature sensor 16, via the wireless repeater 17.

This allows the air conditioning system 100 to obtain the indoor temperature from the external indoor temperature sensor 16, which is located indoors away from the indoor unit 11. Even if the internal indoor temperature sensor 113 built into the indoor unit 11 fails, the air conditioning system 100 can normally and appropriately control the operation of the external heater 15 using the information on the second indoor temperature Tb obtained from the external indoor temperature sensor 16.

In addition, the air conditioning system 100 can suppress or eliminate the influence of the error between the indoor temperature detected inside the indoor unit 11 by the internal indoor temperature sensor 113 built into the indoor unit 11 and the indoor temperature detected outside the indoor unit 11 by the external indoor temperature sensor 16 by presetting a correction value γ for correcting the information of the second indoor temperature Tb to calculate the corrected indoor temperature T_hosei.

Therefore, according to the air conditioning system 100 of embodiment 1, an external heater 15 for auxiliary heating and an external indoor temperature sensor 16 are provided, and the system is configured so that the indoor temperature can be detected not only from inside the indoor unit 11 but also from outside the indoor unit 11. This has the effect of enabling the external heater 15 to be appropriately controlled even if the internal indoor temperature sensor 113 provided in the indoor unit 11 of the air conditioner 10 fails.

Embodiment 2.
In the above-described embodiment 1, a case has been described in which one external indoor temperature sensor 16 is installed in the room which is the area to be air-conditioned. In embodiment 2, a case will be described in which multiple external indoor temperature sensors 16 are installed in the room which is the area to be air-conditioned, and the operation determination unit 114 acquires information on the second indoor temperature Tb, which is information on the external detected indoor temperature, from the external indoor temperature sensor 16 with a higher priority.

Figure 9 is a functional block diagram showing the functional configuration of the air conditioning system 100a according to the second embodiment. The air conditioning system 100a according to the second embodiment differs from the air conditioning system 100 according to the first embodiment in that it has a plurality of external indoor temperature sensors 16 that detect the indoor temperature, which is the temperature of the indoor air. That is, the air conditioning system 100a according to the second embodiment includes an air conditioner 10 having an indoor unit 11 and an outdoor unit 12, a refrigerant pipe 14, a remote controller 13, an external heater 15, external indoor temperature sensors 16a, 16b, and 16c, which are the external indoor temperature sensors 16, and a wireless repeater 17. In addition, in Figure 9, the same symbols as those in the first embodiment are used for the configurations similar to those in the first embodiment.

The external indoor temperature sensor 16a, the external indoor temperature sensor 16b, and the external indoor temperature sensor 16c have the same configuration and function as the external indoor temperature sensor 16 of the air conditioning system 100 according to the first embodiment described above. That is, the external indoor temperature sensor 16a, the external indoor temperature sensor 16b, and the external indoor temperature sensor 16c are arranged outside the indoor unit 11 of the air conditioner 10 indoors, similar to the external indoor temperature sensor 16 of the air conditioning system 100 according to the first embodiment described above. And, the external indoor temperature sensor 16a, the external indoor temperature sensor 16b, and the external indoor temperature sensor 16c detect the second indoor temperature Tb, which is the indoor temperature, outside the air conditioner 10 at a predetermined period, similar to the external indoor temperature sensor 16 of the air conditioning system 100 according to the first embodiment described above, and transmit information on the second indoor temperature Tb to the indoor unit 11.

Next, the operation of the air conditioning system 100a according to the second embodiment will be described. Figure 10 is a flowchart showing the procedure of the operation of the air conditioning system 100a according to the second embodiment. Note that in the flowchart shown in Figure 10, the same step numbers are used for steps that are the same as those in the flowchart shown in Figure 8.

First, steps S110 and S120 described in the flowchart of Figure 8 of embodiment 1 above are performed.

If it is determined that the internal room temperature sensor 113 is normal, the answer is Yes in step S120 and the process proceeds to step S130. If it is determined that the internal room temperature sensor 113 is not normal, the answer is No in step S120 and the process proceeds to step S210.

In step S210, the priority number of the external indoor temperature sensor 16 from which the operation determination unit 114 acquires the second indoor temperature Tbk is set to 1. Specifically, the operation determination unit 114 sets the priority number k of the external indoor temperature sensor 16 from which the operation determination unit 114 acquires the second indoor temperature Tbk to 1. Then, proceed to step S220.

Each of the multiple external indoor temperature sensors 16 constituting the air conditioning system 100a is assigned a priority order P in advance. The priority order P is the order in which the operation determination unit 114 acquires the second indoor temperature Tbk from the multiple external indoor temperature sensors 16 when the result in step S120 is No and it is determined that the internal indoor temperature sensor 113 is not normal. Here, the priority order P of the external indoor temperature sensor 16a is the highest, followed by the external indoor temperature sensor 16b and the external indoor temperature sensor 16c.

The priority order P for the multiple external indoor temperature sensors 16 is determined in advance and stored in the operation determination unit 114. The priority order P for the multiple external indoor temperature sensors 16 may be stored in the indoor unit memory unit 116. The priority order P for the multiple external indoor temperature sensors 16 stored in the operation determination unit 114 can be changed using the remote control 13.

The priority order number k is a number indicating the priority order P of each of the multiple indoor external temperature sensors 16. A priority order number from 1 to n is set for each of the multiple indoor external temperature sensors 16, where n is the number of indoor external temperature sensors 16 constituting the air conditioning system 100a. Here, the priority order numbers 1 to 3 are set for the three indoor external temperature sensors 16, that is, the indoor external temperature sensor 16a, the indoor external temperature sensor 16b, and the indoor external temperature sensor 16c, in order of decreasing priority order P. That is, the priority order number 1 is set for the indoor external temperature sensor 16a. The priority order number 2 is set for the indoor external temperature sensor 16b. The priority order number 3 is set for the indoor external temperature sensor 16c.

The priority order number k for the multiple external indoor temperature sensors 16 is predetermined and stored in the operation determination unit 114. The priority order number k for the multiple external indoor temperature sensors 16 may be stored in the indoor unit memory unit 116. Furthermore, the priority order number k for the multiple external indoor temperature sensors 16 stored in the operation determination unit 114 can be changed in accordance with the change in priority order P when the priority order P is changed using the remote control 13 as described above.

The second indoor temperature Tbk is the second indoor temperature Tb detected by the external indoor temperature sensor 16 having priority number k.

In step S220, information on the second indoor temperature Tbk is acquired from the external indoor temperature sensor 16 with priority number k among the information on the second indoor temperature Tb detected by the multiple external indoor temperature sensors 16. Specifically, the operation determination unit 114 acquires information on the second indoor temperature Tbk, which is information on the second indoor temperature Tb, from the external indoor temperature sensor 16 with priority number k among the information on the second indoor temperature Tb detected by the multiple external indoor temperature sensors 16. If the process proceeds from step S210 to step S220, k is set to 1 in step S210, so the operation determination unit 114 acquires information on the second indoor temperature Tb1 from the external indoor temperature sensor 16a, which is the external indoor temperature sensor 16 with priority number = 1. Then, the process proceeds to step S230.

In step S230, it is determined whether the second indoor temperature Tbk is a normal value. Specifically, the operation determination unit 114 determines whether the second indoor temperature Tbk is a normal value. If the process proceeds in the order of step S210 → step S220 → step S230, k is set to 1 in step S210, so the operation determination unit 114 determines whether the indoor temperature indicated by the second indoor temperature Tb1 is a normal value.

The operation determination unit 114 determines whether the second indoor temperature Tbk is a normal value by comparing the indoor temperature indicated in the information on the second indoor temperature Tbk acquired from the external indoor temperature sensor 16 with a predetermined normal range of indoor temperatures. The normal range of indoor temperatures is the same temperature range as the normal range of indoor temperatures in steps S120 and S160 described in embodiment 1. In addition, the determination of whether the second indoor temperature Tbk is a normal value can be made in the same manner as in step S120 described above.

If it is determined that the second room temperature Tbk is a normal value, i.e., if it is determined that the second room temperature Tbk indicated in the information on the second room temperature Tbk is a normal value, the answer is Yes in step S230 and the process proceeds to step S240. If it is determined that the second room temperature Tbk is not a normal value, i.e., if it is determined that the second room temperature Tbk indicated in the information on the second room temperature Tbk is not a normal value, the answer is No in step S230 and the process proceeds to step S250.

In step S240, the second indoor temperature Tb used to control the external heater 15 is determined to be the second indoor temperature Tbk. Specifically, the operation determination unit 114 determines the second indoor temperature Tb used to control the external heater 15 to be the second indoor temperature Tbk, and sets the second indoor temperature Tbk = the second indoor temperature Tb. If the process proceeds in the order of step S210 → step S220 → step S230 → step S240, k is set to 1 in step S210, so the operation determination unit 114 determines the second indoor temperature Tb to be the second indoor temperature Tb1. Then, proceed to step S170.

In step S250, the priority number k of the second indoor temperature Tbk is incremented by 1, and the priority number k is set to k = k + 1. That is, the priority number of the external indoor temperature sensor 16 from which the operation determination unit 114 acquires information on the second indoor temperature Tbk among the multiple external indoor temperature sensors 16 is incremented by 1 and set. Specifically, the priority number of the external indoor temperature sensor 16 from which the operation determination unit 114 acquires information on the second indoor temperature Tbk among the multiple external indoor temperature sensors 16 is incremented by 1 and set.

That is, when the operation determination unit 114 determines that the second indoor temperature Tbk acquired from the external indoor temperature sensor 16 having the highest priority among the multiple external indoor temperature sensors 16 is abnormal, it changes the priority number k of the second indoor temperature Tbk so that the second indoor temperature Tbk is acquired from the external indoor temperature sensor 16 having the lowest priority. Then, the operation proceeds to step S260.

In step S260, it is determined whether the value of the priority order number k set in step S250 is equal to or less than n, which is the number of external indoor temperature sensors 16 that constitute the air conditioning system 100a. Specifically, the operation determination unit 114 determines whether the value of k = k + 1 newly set in step S250 is equal to or less than n, which is the number of external indoor temperature sensors 16 that constitute the air conditioning system 100a.

If it is determined that the value of k is less than or equal to n, the answer is Yes in step S260 and the process returns to step S220. If it is determined that the value of k is greater than n, the answer is No in step S260 and the process proceeds to step S180.

In steps S130, S140 and S180, the processing described in embodiment 1 above is performed.

As described above, the air conditioning system 100a of embodiment 2 has the same configuration and functions as the air conditioning system 100 of embodiment 1 described above, and therefore has the same effects as the air conditioning system 100 of embodiment 1.

In addition, the air conditioning system 100a according to the second embodiment is configured such that, when there are multiple external indoor temperature sensors 16, a priority can be set for each of the multiple external indoor temperature sensors 16. Then, when it is determined that the second indoor temperature Tbk acquired from the external indoor temperature sensor 16 having a high priority among the multiple external indoor temperature sensors 16 is abnormal, the operation determination unit 114 can acquire the second indoor temperature Tbk from the external indoor temperature sensor 16 having a low priority.

As a result, in the air conditioning system 100a, it is possible to prevent the multiple second indoor temperatures Tb acquired from the multiple external indoor temperature sensors 16 from competing with each other in the indoor unit 11 and interfering with the control of the external heater 15 in the indoor unit 11, and it is possible to appropriately control the external heater 15. And in the air conditioning system 100a configured in this manner, if there is even one external indoor temperature sensor 16 that can detect a normal value among the multiple external indoor temperature sensors 16 that detect the indoor temperature in the air conditioning system 100a, it is possible to normally control the operation of the external heater 15 without turning off the external heater 15.

Next, the hardware configuration of each of the control units 80 according to the first embodiment will be described. The control unit 80 according to the first embodiment corresponds to each of the air conditioning control unit 118 of the indoor unit 11 of the air conditioner 10, the remote control control unit 135 of the remote control 13, and the external heater control unit 153 of the external heater 15 according to the first embodiment. Each function of the control unit 80 according to the first embodiment is realized by a processing circuit. The processing circuit may be dedicated hardware, or may be a processing device that executes a program stored in a storage device.

When the processing circuit is a dedicated hardware, the processing circuit may be a single circuit, a composite circuit, a programmed processor, a parallel programmed processor, an application specific integrated circuit, a field programmable gate array, or a combination of these. Figure 11 is a diagram showing a configuration in which the functions of the control unit 80 according to the first embodiment are realized by hardware. The processing circuit 81 incorporates a logic circuit 81a that realizes the functions of the control unit 80.

When the processing circuit 81 is a processing device, the functions of the control unit 80 are realized by software, firmware, or a combination of software and firmware.

Figure 12 is a diagram showing a configuration in which the functions of the control unit 80 according to the first embodiment are realized by software. The processing circuit 81 has a processor 811 that executes the program 81b, a random access memory 812 that the processor 811 uses as a work area, and a storage device 813 that stores the program 81b. The processor 811 deploys the program 81b stored in the storage device 813 on the random access memory 812 and executes it, thereby realizing the functions of the control unit 80. The software or firmware is written in a program language and stored in the storage device 813. The processor 811 can be exemplified by a central processing unit, but is not limited to this. The storage device 813 can be a semiconductor memory such as a RAM (Random Access Memory), a ROM (Read Only Memory), a flash memory, an EPROM (Erasable Programmable Read Only Memory), or an EEPROM (registered trademark) (Electrically Erasable Programmable Read Only Memory). The semiconductor memory may be a non-volatile memory or a volatile memory. Further, in addition to a semiconductor memory, a magnetic disk, a flexible disk, an optical disk, a compact disk, a mini disk, or a DVD (Digital Versatile Disc) can be applied to the storage device 813. The processor 811 may output data such as a calculation result to the storage device 813 for storage, or may store the data in an auxiliary storage device (not shown) via the random access memory 812. By integrating the processor 811, the random access memory 812, and the storage device 813 on one chip, the functions of the control unit 80 can be realized by a microcomputer.

The processing circuit 81 realizes the functions of the control unit 80 by reading and executing the program 81b stored in the storage device 813. It can also be said that the program 81b causes the computer to execute the procedures and methods for realizing the functions of the control unit 80.

In addition, the processing circuit 81 may be configured to realize some of the functions of the control unit 80 using dedicated hardware and some of the functions of the control unit 80 using software or firmware.

Thus, the processing circuit 81 can realize each of the above-mentioned functions through hardware, software, firmware, or a combination of these.

The configurations shown in the above embodiments are merely examples, and may be combined with other known technologies, or the embodiments may be combined with each other. Also, parts of the configurations may be omitted or modified without departing from the spirit of the invention.

1 Compressor, 2 Outdoor heat exchanger, 3 Expansion valve, 4 Indoor heat exchanger, 5 Four-way valve, 6 Outdoor air temperature sensor, 10 Air conditioner, 11 Indoor unit, 12 Outdoor unit, 13 Remote controller, 14 Refrigerant pipe, 15 External heater, 16, 16a, 16b, 16c External indoor temperature sensor, 17 Wireless repeater, 80 Control unit, 81 Processing circuit, 81a Logic circuit, 81b Program, 100, 100a Air conditioning system, 111 Indoor unit air conditioning unit, 112 Indoor unit blower, 113 Internal indoor temperature sensor, 114 Operation determination unit, 115 Heater control unit, 116 Indoor unit memory unit, 117 Indoor unit communication unit, 118 Air conditioning control unit, 131 Remote controller operation unit, 132 Remote controller display unit, 133 Remote controller memory unit, 134 Remote controller communication unit, 135 remote controller control unit, 151 heater unit, 152 external heater communication unit, 153 external heater control unit, 161 external sensor detection unit, 162 external sensor communication unit, 811 processor, 812 random access memory, 813 storage device.

Claims (4)

An air conditioner having a refrigeration cycle in which an indoor unit installed in a room which is an air-conditioned area and an outdoor unit installed outdoors are connected by a refrigerant pipe that circulates a refrigerant;
an external heater provided within the chamber;
An external indoor temperature detection unit that is provided outside the indoor unit in the room and detects an external detected indoor temperature, which is the indoor temperature of the room detected outside the indoor unit;
A communication relay unit that relays communication between the external indoor temperature detection unit and the indoor unit;
Equipped with
The indoor unit includes:
An internal indoor temperature detection unit that detects an internal detected indoor temperature, which is the indoor temperature detected in the indoor unit;
an operation determination unit that determines whether the internal room temperature detection unit is operating normally;
a heater control unit that controls the external heater based on the internal detected indoor temperature when it is determined that the internal indoor temperature detection unit is operating normally, and controls the external heater based on the external detected indoor temperature acquired from the external indoor temperature detection unit via the communication relay device when it is determined that the internal indoor temperature detection unit is not operating normally;
having
The operation determination unit determines whether the external indoor temperature detection unit is operating normally when it is determined that the internal indoor temperature detection unit is not operating normally,
When it is determined that the internal indoor temperature detection unit is not operating normally and further when it is determined that the external indoor temperature detection unit is operating normally, the heater control unit controls the external heater based on a corrected indoor temperature obtained by correcting the external detected indoor temperature based on a predetermined correction value.
Air conditioning system. The operation determination unit is
When the internal detected indoor temperature is within a predetermined normal range of indoor temperatures, it is determined that the internal indoor temperature detection unit is operating normally;
When the internal detected indoor temperature is outside the normal range of the indoor temperature, it is determined that the internal indoor temperature detection unit is not operating normally.
The air conditioning system of claim 1 . The correction value is a value determined in advance based on combined information of indoor temperatures detected at the same time by the indoor temperature detected by the external indoor temperature detection unit and the indoor temperature detected by the internal indoor temperature detection unit.
3. An air conditioning system according to claim 1 or 2. A plurality of the external indoor temperature detection units are provided, and a priority order of the order in which the external detected indoor temperatures are acquired by the operation determination unit is preset.
When it is determined that the external detected indoor temperature acquired from the external indoor temperature detection unit having the higher priority among the plurality of the external indoor temperature detection units is abnormal, the operation determination unit acquires the external detected indoor temperature from the external indoor temperature detection unit having the lower priority.
An air conditioning system according to any one of claims 1 to 3.

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