JP6910474B2 - Air conditioner - Google Patents

Description

The present invention relates to an air conditioner provided with a filter that removes foreign matter from the return air from the living room space in which the indoor unit blows out the air conditioner.

Conventionally, the method of detecting clogging such as dirt in the filter arranged in the space where the air conditioner is installed is by visual inspection or from the measured temperature and the motor rotation speed of the suction temperature sensor of the indoor unit of the air conditioner. What is calculated is known (see, for example, Patent Document 1).

Japanese Patent No. 3972723

In air conditioners used in business hotels and the like, it is common to apply a ceiling-embedded indoor unit. Ceiling-embedded indoor units are often installed in the ceiling pocket, which is inside the ceiling with the suction port lowered. The ceiling-embedded indoor unit uses a ceiling chamber type as a suction method, and takes in outside air from an outside air intake port opened inside the ceiling pocket through a duct leading from the outside to ventilate.

In the case of a conventional air conditioner, clogging of the filter is often visually determined. Here, in an air conditioner installed in a business hotel or the like, when the filter is clogged, the amount of outside air flowing in from the outside air intake port or the gap leading to the ceiling pocket increases. As a result, the suction temperature sensor built into the ceiling-embedded indoor unit cannot accurately measure the temperature of the living room space, which is an air-conditioned space. Alternatively, the suction temperature sensor significantly deteriorates the followability of the measured temperature with respect to the temperature of the living room space. Therefore, in the air conditioner, the control of the indoor temperature of the living room space becomes unstable. On the other hand, it is necessary for the operator to frequently clean the filter and to increase the frequency of visual inspection by the operator so that the filter is not clogged.

An object of the present invention is to solve the above problems, and an object of the present invention is to provide an air conditioner capable of easily mechanically determining clogging of a filter and allowing an operator to clean the filter at an appropriate timing. ..

The air conditioner according to the present invention is provided on the indoor unit, a filter that is arranged outside the suction port of the indoor unit and removes foreign matter from the return air from the living room space where the indoor unit blows out the harmonized air, and the suction port. an outside air intake port for supplying the outside air, is disposed inside the suction port, and the outside air from the outside air intake port, and return air from the residence chamber space via said filter, based on the suction of the pre-conditioning The difference between the measurement temperature of the first temperature sensor for measuring the temperature of air, the second temperature sensor arranged in the living room space, the measurement temperature of the first temperature sensor, and the measurement temperature of the second temperature sensor is equal to or larger than the threshold value. A control unit having a clogging determination unit for determining that clogging of the filter has occurred, and the control unit performs air conditioning by comparing the set temperature with the measurement temperature of the first temperature sensor. It has a normal operation unit and a thermo-off operation detection unit that detects a thermo-off operation that switches to a blower operation when the measurement temperature of the first temperature sensor reaches a set temperature, and the clogging determination unit detects the thermo-off operation. Immediately after the unit detects the start of the thermo-off operation, if the difference is equal to or greater than the threshold value, it is determined that the filter is clogged .

According to the air conditioner according to the present invention, if the difference between the measurement temperature of the first temperature sensor and the measurement temperature of the second temperature sensor is equal to or larger than the threshold value, the clogging determination unit for determining that the filter is clogged is provided. It has a control unit. Therefore, the clogging of the filter can be easily determined mechanically, and the operator can clean the filter at an appropriate timing.

It is a refrigerant circuit diagram which shows the air conditioner which concerns on Embodiment 1 of this invention. It is the schematic which shows the installation environment of the indoor unit which concerns on Embodiment 1 of this invention. It is a functional block diagram which shows the function necessary for the clogging detection control of the filter of the air conditioner which concerns on Embodiment 1 of this invention. It is a flowchart which shows the clogging detection control of the filter of the air conditioner which concerns on Embodiment 1 of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In each figure, those having the same reference numerals are the same or equivalent thereof, and they are common in the entire text of the specification. Further, in the cross-sectional view, hatching is omitted as appropriate in view of visibility. Furthermore, the forms of the components shown in the full text of the specification are merely examples and are not limited to these descriptions.

Embodiment 1.
<Structure of air conditioner 100>
FIG. 1 is a refrigerant circuit diagram showing an air conditioner 100 according to a first embodiment of the present invention. In the air conditioner 100 shown in FIG. 1, the outdoor unit 101 and the indoor unit 102 are connected by a gas refrigerant pipe 103 and a liquid refrigerant pipe 104.

The outdoor unit 101 includes a compressor 105, a four-way valve 106, an outdoor heat exchanger 107, and an expansion valve 108.

The compressor 105 compresses and discharges the sucked refrigerant. The compressor 105 may arbitrarily change the operating frequency by, for example, an inverter circuit or the like, and change the capacity for delivering the refrigerant per unit time of the compressor 105.

The four-way valve 106 is a valve that switches the flow of the refrigerant depending on, for example, the cooling operation and the heating operation.

The outdoor heat exchanger 107 exchanges heat between the refrigerant and the outdoor air. The outdoor heat exchanger 107 functions as a condenser during the cooling operation to condense and liquefy the refrigerant. The outdoor heat exchanger 107 functions as an evaporator during the heating operation to evaporate and vaporize the refrigerant.

The expansion valve 108 is a flow rate control valve, and reduces the pressure of the refrigerant to expand it. When the expansion valve 108 is composed of, for example, an electronic expansion valve, the opening degree can be adjusted based on an instruction from a control device (not shown) or the like.

The indoor unit 102 has an indoor heat exchanger 109. The indoor heat exchanger 109 exchanges heat between, for example, air to be air-conditioned and a refrigerant. The indoor heat exchanger 109 functions as an evaporator during the cooling operation to evaporate and vaporize the refrigerant. The indoor heat exchanger 109 functions as a condenser during the heating operation to condense and liquefy the refrigerant.

By configuring the air conditioner 100 as described above, the flow of the refrigerant can be switched by the four-way valve 106 of the outdoor unit 101, and cooling operation or heating operation can be realized.

<Installation environment of indoor unit 102>
FIG. 2 is a schematic view showing an installation environment of the indoor unit 102 according to the first embodiment of the present invention. As shown in FIG. 2, the indoor unit 102 is arranged in a ceiling pocket 111, which is in a descending ceiling separated from a living room space 110 in which the indoor unit 102 blows out conditioned air.

The indoor unit 102 is arranged inside the suction port 102a and has a first temperature sensor 112 that measures the temperature of the suction air before harmonization. The first temperature sensor 112 is arranged on the upstream side in the air flow direction with respect to the indoor heat exchanger 109 and the blower fan 113 in the indoor unit 102.

A filter 114 capable of allowing air to pass through is arranged in the partition portion between the living room space 110 and the ceiling pocket 111. The filter 114 is detachably attached to the vent 115. The filter 114 is arranged outside the suction port 102a of the indoor unit 102, and removes foreign matter from the return air from the living room space 110 where the indoor unit 102 blows out conditioned air. The filter 114 is an air filter that collects foreign matter and causes clogging.

The ceiling pocket 111 is provided with an outside air intake port 117 via a duct 116 that communicates from the outside. The outside air intake port 117 supplies outside air to the suction port 102a of the indoor unit 102.

A remote controller 119 connected to the indoor unit 102 via a communication line 118 is arranged in the living room space 110. The remote controller 119 adjusts the set temperature. The set temperature may be set from other than the remote controller 119. The remote controller 119 is provided with a second temperature sensor 120. The second temperature sensor 120 may be separate from the remote controller 119 as long as it is arranged in the living room space 110 and is connected to the indoor unit 102 via a communication line.

The indoor unit 102 is provided with a control unit 121 that controls clogging of the filter 114, which is a feature of the first embodiment described later. Although the details will be described later, the control unit 121 has a clogging determination unit 126. The clogging determination unit 126 determines that the filter 114 is clogged when the difference between the measurement temperature T1 of the first temperature sensor 112 and the measurement temperature T2 of the second temperature sensor 120 is equal to or greater than the threshold value α. The control unit 121 is a processing circuit including a microcomputer provided with a CPU, a ROM, a RAM, an I / O port, and the like.

<Functional configuration of control unit 121>
FIG. 3 is a functional block diagram showing a function required for clogging detection control of the filter 114 of the air conditioner 100 according to the first embodiment of the present invention. In addition, among the functions of the air conditioner 100, only the functions necessary for performing clogging detection control of the filter 114, which is a feature of the first embodiment described later, will be described here. As another function, the air conditioner 100 can control a compressor 105, a four-way valve 106, an expansion valve 108, and the like for performing air conditioning in a cooling operation or a heating operation.

The air conditioner 100 has a first temperature sensor 112 and a control unit 121 in the indoor unit 102. The first temperature sensor 112 measures the suction air temperature of the indoor unit 102.

The air conditioner 100 has a second temperature sensor 120, a display unit 122, and an operation unit 123 on the remote controller 119. The second temperature sensor 120 measures the room temperature of the living room space 110. The display unit 122 displays an alarm or displays an operation result. The operation unit 123 is operated by the user to set the set temperature.

The control unit 121 of the indoor unit 102 includes a temperature difference calculation unit 124, a thermo-off operation detection unit 125, a clogging determination unit 126, an alarm issuing unit 127, a clogging operation unit 128, and a normal operation unit 129. include.

The temperature difference calculation unit 124 calculates the difference between the measurement temperature T1 of the first temperature sensor 112 and the measurement temperature T2 of the second temperature sensor 120 to calculate the absolute value difference value ΔT = | T1-T2 |. do.

The thermo-off operation detection unit 125 detects that the operation of the air conditioner 100 is switched to the blower operation when the measurement temperature T1 of the first temperature sensor 112 reaches the set temperature. The set temperature is set by operating the operation unit 123 provided on the remote controller 119. The thermo-off operation itself may be controlled by a control device (not shown) such as an outdoor unit 101.

Immediately after the thermo-off operation detection unit 125 detects the start of the thermo-off operation, the clogging determination unit 126 has a difference ΔT between the measurement temperature T1 of the first temperature sensor 112 and the measurement temperature T2 of the second temperature sensor 120 of the threshold α or more. If this is the case, it is determined that the filter 114 is clogged.

The alarm issuing unit 127 issues an alarm when the clogging determining unit 126 determines that the filter 114 is clogged. The alarm issuing unit 127 may display a clogging alarm of the filter 114 on the display unit 122 of the remote controller 119. Further, the alarm issuing unit 127 may notify the administrator of the clogging alarm of the filter 114 via the communication network.

When the clogging determination unit 126 determines that the filter 114 is clogged, the clogging operation unit 128 compares the set temperature set by the remote controller 119 with the measurement temperature T2 of the second temperature sensor 120 for air conditioning. To carry out. That is, when the filter 114 is clogged, the clogging operation unit 128 air-conditions by the measurement temperature T2 of the second temperature sensor 120 provided in the remote controller 119 arranged in the living room space 110 to be actually air-conditioned. implement.

The normal operation unit 129 performs air conditioning by comparing the set temperature set by the remote controller 119 at the normal time with the measured temperature T1 of the first temperature sensor 112. That is, the normal operation unit 129 performs air conditioning by the measurement temperature T1 of the first temperature sensor 112 that measures the suction air temperature of the indoor unit 102 in order to improve the efficiency of air conditioning control when the filter 114 is not clogged. ..

<Clogged detection control of filter 114>
FIG. 4 is a flowchart showing clogging detection control of the filter 114 of the air conditioner 100 according to the first embodiment of the present invention. The clogging detection control routine of the filter 114 is repeatedly executed at predetermined intervals.

As a premise that the control shown in FIG. 4 is performed, the air conditioner 100 performs air conditioning in a cooling operation or a heating operation. At this time, the indoor unit 102 sucks the air in the living room space 110 from the vent 115 in which the filter 114 is arranged. Further, the indoor unit 102 sucks the outside air from the outside air intake port 117 through the duct 116. Then, the indoor unit 102 blows out the conditioned air that has been heat-exchanged with the refrigerant by the indoor heat exchanger 109 from the outlet 130 to the living room space 110.

The set temperature of the living room space 110 is set by operating the operation unit 123 of the remote controller 119. In the control unit 121, the measurement temperature T1 of the first temperature sensor 112 that measures the suction air temperature of the indoor unit 102 in order to improve the efficiency of air conditioning control when the normal operation unit 129 is not clogged with the filter 114 during normal operation. Air conditioning is carried out by.

In step S101, the control unit 121 receives the measured temperature T1 of the first temperature sensor 112. After this process, the process proceeds to step S102.

In step S102, the control unit 121 receives the measured temperature T2 of the second temperature sensor 120. After this process, the process proceeds to step S103.

In step S103, the temperature difference calculation unit 124 of the control unit 121 calculates the difference between the measurement temperature T1 of the first temperature sensor 112 and the measurement temperature T2 of the second temperature sensor 120, and calculates the difference between the absolute values ΔT =. | T1-T2 | is calculated. After this process, the process proceeds to step S104.

In step S104, has the thermo-off operation detection unit 125 of the control unit 121 started the thermo-off operation in which the operation of the air conditioner 100 is switched to the blower operation when the measurement temperature T1 of the first temperature sensor 112 reaches the set temperature? Detect whether or not. When it is detected in step S104 that the thermo-off operation has started, the process proceeds to step S105. If it is not detected in step S104 that the thermo-off operation has started, the process proceeds to step S110.

Here, the ceiling pocket 111 and the living room space 110 are connected to each other via a vent 115. Therefore, ΔT becomes smaller as the air conditioning operation time elapses, and becomes the minimum when the measurement temperature T1 reaches the set temperature. The thermo-off operation is an operation in which the operation is switched to the ventilation operation when the measured temperature T1 reaches the set temperature.

In step S105, immediately after the start of the thermo-off operation, the clogging determination unit 126 of the control unit 121 has a threshold value α of the difference value ΔT between the measurement temperature T1 of the first temperature sensor 112 and the measurement temperature T2 of the second temperature sensor 120. It is determined whether or not it is the above. If ΔT ≧ threshold value α in step S105, the process proceeds to step S106. If ΔT <threshold value α in step S105, the process proceeds to step S110.

Immediately after the start of the thermo-off operation, if ΔT <threshold value α, there is no discrepancy between the measured temperature T1 and the measured temperature T2. It is determined that there is no deviation and there is no clogging of the filter 114.

On the other hand, when the filter 114 attached to the vent 115 is clogged, the amount of outside air taken in from the outside air intake port 117 increases in the indoor unit 102 due to the difference in pressure loss. In addition, in the indoor unit 102, the amount of return air taken into the living room space 110 from the vent 115 is reduced. Therefore, the temperature inside the ceiling pocket 111 becomes close to the outside air temperature, and ΔT gradually increases regardless of the cooling / heating air conditioning operation. In other words, the temperature of the ceiling pocket 111 is closer to the outside air temperature than the room temperature of the living room space 110. Therefore, it can be determined that the filter 114 is clogged by determining ΔT ≧ threshold value α.

In step S106, the clogging determination unit 126 of the control unit 121 determines that the filter 114 is clogged. After this process, the process proceeds to step S107.

In step S107, the alarm issuing unit 127 of the control unit 121 issues an alarm when the clogging determining unit 126 determines that the filter 114 is clogged. The alarm issuing unit 127 may display a clogging alarm of the filter 114 on the display unit 122 of the remote controller 119. Further, the alarm issuing unit 127 may notify the administrator of the clogging alarm of the filter 114 via the communication network. The alarm issuing unit 127 displays, for example, a filter cleaning sign on the remote controller 119. After this process, the process proceeds to step S108.

In step S108, when the clogging operation unit 128 of the control unit 121 determines that the clogging determination unit 126 has clogged the filter 114, the second temperature sensor 120 sets the set temperature set by the remote controller 119. Air conditioning is carried out in comparison with the measured temperature T2 of. That is, when the filter 114 is clogged, the clogging operation unit 128 air-conditions by the measurement temperature T2 of the second temperature sensor 120 provided in the remote controller 119 arranged in the living room space 110 to be actually air-conditioned. implement. This prevents the room temperature of the living room space 110 from deviating significantly from the set temperature. Then, overcooling or overheating is suppressed. After this process, the process proceeds to step S109.

Here, when the measured temperature T2 of the second temperature sensor 120 is used as the detected room temperature, ΔT increases even if the thermo-on operation accompanied by the cooling / heating air-conditioning control is continued from the thermo-off operation state which is the ventilation operation. Continue. Therefore, the control unit 121 may determine that the filter 114 is clogged even when the start of thermo-on operation is detected and ΔT ≧ threshold value α.

In step S109, the control unit 121 performs air conditioning in the thermo-off operation and the thermo-on operation, and determines whether or not the clogging of the filter 114 is cleared. Specifically, it is determined whether or not ΔT <threshold value α is satisfied while performing air conditioning. When the clogging of the filter 114 is cleared in step S109, the process proceeds to step S110. If the clogging of the filter 114 is not cleared in step S109, the process returns to step S107.

In step S110, the normal operation unit 129 of the control unit 121 compares the set temperature set by the remote controller 119 at the normal time with the measurement temperature T1 of the first temperature sensor 112 to perform air conditioning. That is, the normal operation unit 129 performs air conditioning by the measurement temperature T1 of the first temperature sensor 112 that measures the suction air temperature of the indoor unit 102 in order to improve the efficiency of air conditioning control when the filter 114 is not clogged. ..

As described above, the first temperature sensor 112 of the indoor unit 102 and the second temperature sensor 120 built in the remote controller 119 are divided into the ceiling pocket 111 and the living room space 110 via the vent 115 to which the filter 114 is attached. Will be installed. Therefore, when the filter 114 is clogged, the amount of outside air taken in from the duct 116 to the outside air intake port 117 increases, and a temperature difference occurs between the ceiling pocket 111 and the living room space 110. In view of this phenomenon, clogging of the filter 114 can be detected.

Therefore, the clogged state of the filter 114 independent of the indoor unit 102 can be detected, the operator can clean the filter 114 at an appropriate timing, and the filter 114 can be kept clean. In addition, it is possible to prevent a decrease in air conditioning capacity due to clogging of the filter 114.

<Effect of Embodiment 1>
According to the first embodiment, the air conditioner 100 includes an indoor unit 102. The air conditioned device 100 is arranged outside the suction port 102a of the indoor unit 102, and includes a filter 114 that removes foreign matter from the return air from the living room space 110 where the indoor unit 102 blows out conditioned air. The air conditioner 100 includes an outside air intake port 117 that supplies outside air to the suction port 102a. The air conditioning device 100 is arranged inside the suction port 102a and includes a first temperature sensor 112 that measures the temperature of the suction air before harmonization. The air conditioner 100 includes a remote controller 119 that adjusts the set temperature. The air conditioner 100 includes a second temperature sensor 120 arranged in the living room space 110. The air conditioner 100 determines that the filter 114 is clogged when the difference ΔT between the measured temperature T1 of the first temperature sensor 112 and the measured temperature T2 of the second temperature sensor 120 is equal to or greater than the threshold value α. A control unit 121 having a determination unit 126 is provided.

According to this configuration, if the difference ΔT between the measurement temperature T1 of the first temperature sensor 112 and the measurement temperature T2 of the second temperature sensor 120 is equal to or greater than the threshold value α, it is determined that the filter 114 is clogged. A control unit 121 having a determination unit 126 is provided. As a result, it is possible to indirectly determine the clogging of the filter 114 installed at a location independent of the indoor unit 102 and away from the indoor unit 102. Therefore, the clogging of the filter 114 can be easily determined mechanically, and the operator can clean the filter 114 at an appropriate timing.

According to the first embodiment, the indoor unit 102 is arranged in the ceiling pocket 111 separated from the living room space 110. The filter 114 is arranged so as to allow air to communicate freely in the partition portion between the living room space 110 and the ceiling pocket 111. The outside air intake port 117 is provided in the ceiling pocket 111 via a duct 116 that communicates from the outside.

According to this configuration, the clogging determination unit 126 is partitioned from the measurement temperature T1 of the first temperature sensor 112 arranged inside the suction port 102a of the indoor unit 102 arranged in the ceiling pocket 111 and the ceiling pocket 111. When the difference ΔT with the measurement temperature T2 of the second temperature sensor 120 arranged in the living room space 110 is equal to or greater than the threshold value α, it can be determined that the filter 114 is clogged. Therefore, the clogging of the filter 114 can be easily determined mechanically, and the operator can clean the filter 114 at an appropriate timing.

According to the first embodiment, the air conditioner 100 includes a remote controller 119 that adjusts the set temperature. The second temperature sensor 120 is provided on the remote controller 119.

According to this configuration, the second temperature sensor 120 is integrated with the remote controller 119, and if the remote controller 119 is arranged in the living room space 110, it is not necessary to arrange the remote controller 119 individually. This facilitates the installation work of the air conditioner 100.

According to the first embodiment, the control unit 121 has a normal operation unit 129 that performs air conditioning by comparing the set temperature set by the remote controller 119 or the like at the normal time with the measurement temperature T1 of the first temperature sensor 112.

According to this configuration, the normal operation unit 129 can perform air conditioning by comparing the set temperature set by the remote controller 119 or the like at the normal time with the measurement temperature T1 of the first temperature sensor 112. As a result, the air conditioner 100 can efficiently and comfortably perform air conditioning in normal times.

According to the first embodiment, the control unit 121 has a thermo-off operation detection unit 125 that detects a thermo-off operation that switches to a blower operation when the measurement temperature T1 of the first temperature sensor 112 reaches a set temperature. Immediately after the thermo-off operation detection unit 125 detects the start of the thermo-off operation, the clogging determination unit 126 determines that the filter 114 is clogged if the difference ΔT is equal to or greater than the threshold value α.

According to this configuration, immediately after the start of the thermo-off operation, the measured temperature T1 of the first temperature sensor 112 arranged inside the suction port 102a of the indoor unit 102 arranged in the ceiling pocket 111 is the living room space 110 to be air-conditioned. The set temperature is reached. In this case, normally, the measured temperature T1 of the first temperature sensor 112 and the temperature of the living room space 110 to be air-conditioned should match. However, if the difference ΔT between the measured temperature T1 of the first temperature sensor 112 and the measured temperature T2 of the second temperature sensor 120 immediately after the start of the thermo-off operation is equal to or greater than the threshold α, it is actually arranged in the living room space 110. The measured temperature T2 of the second temperature sensor 120 provided on the remote control 119 deviates from the measured temperature T2 of the first temperature sensor 112. That is, the measured temperature T1 of the first temperature sensor 112 arranged inside the suction port 102a of the indoor unit 102 arranged in the ceiling pocket 111 is clogged with the filter 114, and the amount of outside air taken in from the outside air intake port 117 is large. It can be judged that the number has increased. Therefore, the clogging determination unit 126 can determine that the filter 114 is clogged in this case.

According to the first embodiment, the control unit 121 has an alarm issuing unit 127 that issues an alarm when the clogging determining unit 126 determines that the filter 114 is clogged.

According to this configuration, the alarm issuing unit 127 issues an alarm so that the operator can immediately confirm the clogged state of the filter 114. Therefore, the clogging of the filter 114 can be easily determined mechanically, and the operator can clean the filter 114 at an appropriate timing.

According to the first embodiment, when the clogging determination unit 126 determines that the filter 114 is clogged, the control unit 121 measures the set temperature set by the remote controller 119 or the like by the second temperature sensor 120. It has a clogging operation unit 128 that performs air conditioning as compared with the temperature T2.

According to this configuration, when the clogging determination unit 126 determines that the filter 114 is clogged and the measurement temperature T1 of the first temperature sensor 112 detects the room temperature of the living room space 110, it is accurate. Room temperature cannot be detected. Therefore, the air conditioner 100 may perform overcooling or overheating air conditioning. Therefore, when the clogging determination unit 126 determines that the filter 114 is clogged, the measurement temperature T2 of the second temperature sensor 120 provided in the remote control 119 arranged in the living room space 110 to be actually air-conditioned. This allows the air conditioning to be continued, and while the efficient control of the air conditioning is sacrificed, the deviation of the room temperature measurement can be prevented, and the comfort of the living room space 110 can be maintained preferentially.

100 Air conditioner, 101 Outdoor unit, 102 Indoor unit, 102a suction port, 103 Gas refrigerant pipe, 104 Liquid refrigerant pipe, 105 Compressor, 106 Four-way valve, 107 Outdoor heat exchanger, 108 Expansion valve, 109 Indoor heat exchanger , 110 Living room space, 111 Ceiling pocket, 112 1st temperature sensor, 113 blower fan, 114 filter, 115 vent, 116 duct, 117 outside air intake, 118 communication line, 119 remote control, 120 2nd temperature sensor, 121 control unit , 122 display unit, 123 operation unit, 124 temperature difference calculation unit, 125 thermo-off operation detection unit, 126 clogging determination unit, 127 alarm issuing unit, 128 clogging operation unit, 129 normal operation unit, 130 outlet.

Claims (5)

Indoor unit and
A filter that is placed outside the suction port of the indoor unit and removes foreign matter from the return air from the living room space where the indoor unit blows out conditioned air.
An outside air intake port that supplies outside air to the suction port and
It is disposed inside the suction port, and the outside air from the outside air intake port, and return air from the residence chamber space via said filter, based on the first temperature to measure the temperature of suction air before conditioning With the sensor
The second temperature sensor arranged in the living room space and
A control unit having a clogging determination unit that determines that clogging of the filter has occurred when the difference between the measurement temperature of the first temperature sensor and the measurement temperature of the second temperature sensor is equal to or greater than a threshold value.
Equipped with a,
The control unit
A normal operation unit that performs air conditioning by comparing the set temperature with the measured temperature of the first temperature sensor, and
With the thermo-off operation detection unit that detects the thermo-off operation that switches to the ventilation operation when the measurement temperature of the first temperature sensor reaches the set temperature.
Have,
The clogging determination unit determines that the filter is clogged if the difference is equal to or greater than the threshold value immediately after the thermo-off operation detection unit detects the start of the thermo-off operation.
Air conditioner. The indoor unit is arranged in a ceiling pocket separated from the living room space, and conditioned air is blown from the ceiling pocket to the living room space.
The filter is arranged so that air can be freely communicated in the partition portion between the living room space and the ceiling pocket, and the return air from the living space is taken into the ceiling pocket.
The air conditioner according to claim 1, wherein the outside air intake port is provided in the ceiling pocket via a duct leading from the outside. Equipped with a remote control to adjust the set temperature
The air conditioner according to claim 1 or 2, wherein the second temperature sensor is provided on the remote controller. The air conditioner according to any one of claims 1 to 3 , wherein the control unit has an alarm issuing unit that issues an alarm when the clogging determining unit determines that the filter is clogged. .. When the clogging determination unit determines that the filter is clogged, the control unit compares the set set temperature with the measurement temperature of the second temperature sensor to perform air conditioning. The air conditioner according to any one of claims 1 to 4 , which has a part.

Images