ES2402983T3 - Air conditioning apparatus - Google Patents

Abstract

An air conditioning apparatus (100) layeredAn air conditioning apparatus (100) capable of the air conditioning operation and dz of the air conditioning operation and provided with a drain pan (9) that collects the tray (9) drainage that collects the condensed water (13) generated in the condensed water exchanger (13) generated in the heat exchanger as drainage water (12), comprising: heat as drainage water (12), which it comprises: a drain pump (10) that drains the water (12) a drain pump (10) that drains the drain water (12) collected in the drain pan (9); and drain collected in the drain pan (9); and a controller (60) that controls the pump (10) of a controller (60) that controls the drain pump (10), characterized in that said drainage controller, characterized in that said controller compares a rotation speed of the pump (10) For a rotation speed of the drain pump (10) with a predetermined reference value of drain with a predetermined reference value of the drift speed, and determines the display of the drift speed, and determines the presence or absence of a fault symptom of drainage nce or absence of a symptom of drain drain of the drain pump (10) based on the result of the drain pump (10) based on the result of the comparison. the comparison.

Description

Air conditioning apparatus

Background of the invention

one.

 Field of the Invention The present invention relates to an air conditioning apparatus.

2.

 Description of the related technique

Conventionally, several types of air conditioning apparatus have been proposed in which a water level detection unit detects the level of water in a drain pan that collects drained water generated in a heat exchanger, and in which operates a drain pump to drain the drain water depending on the level of water detected (for example, see patent literature 1).

The air conditioner may have a drain fault caused by a higher viscosity of the drain water, a drain pump failure and foreign substances stuck in a drain line connected to the drain pump during operation. In such a case, in an air conditioning apparatus such as that described in the patent literature 1, when the water level in the drain pan increases and the water level detection means detects that the water level has exceeded At a predetermined level, operation stops depending on the detected result, to prevent the overflow of the drainage water from the drainage tray.

Reference List

Patent Bibliography

Patent Bibliography 1: Publication of an unexamined Japanese patent application number 5-141686 (for example, figure 1).

In the technology described in patent literature 1, a user recognizes a drain failure because the air conditioning apparatus stops its operation due to the drain failure, and then the drain pump must be repaired. Therefore, maintenance management is arduous and takes a considerable amount of time until the air conditioning apparatus is repaired.

JP 2008 096002 is the closest prior art for claims 1 and 4 and describes the preamble of claims 1 and 4.

Compendium of the invention

To solve the problems described above, it is an object of the invention to disclose an air conditioning apparatus, which facilitates maintenance management by means of detecting a symptom of drainage failure.

An air conditioning apparatus according to the invention is described in claims 1 and 4.

According to the air conditioning apparatus of the invention, since the symptom of drainage failure is detected, the user can easily manage the maintenance of the air conditioning apparatus.

Brief description of the drawings

Figure 1 is a diagram showing in synthesis a configuration of an air conditioning apparatus according to embodiment 1 of the invention;

Figure 2 is a diagram showing in synthesis a configuration of an air conditioning apparatus according to embodiment 2 of the invention; Y

Figure 3 shows an example circuit of an engine of a drain pump in the air conditioning apparatus shown in Figure 2.

Description of preferred embodiments

Embodiments of the invention will now be described with reference to the drawings. Embodiment 1 Figure 1 is a diagram showing in synthesis a configuration of a conditioning apparatus 100 of

air according to embodiment 1 of the invention. In the following drawings, including Figure 1, the dimensional relationships of each component may be different from the actual relationships. The air conditioning apparatus 100 includes a function to detect a symptom of drainage failure and request the user to perform maintenance in advance. In other words, the air conditioning apparatus 100 is capable of requesting the user to perform maintenance before the air conditioning apparatus 100 is damaged due to a drainage failure preventing the air conditioning operation.

[Coolant cycle setup of air conditioning unit 100]

First, a configuration of the refrigerant cycle of the air conditioning apparatus 100 will be described.

The air conditioning apparatus 100 includes an indoor unit 101 and an outdoor unit 102.

The indoor unit 101 includes at least one indoor heat exchanger 2. An internal fan 3 is arranged in the vicinity of the internal heat exchanger 2.

The internal heat exchanger 2 is configured to function as an evaporator that cools the air at the time of the cooling operation, and to function as a condenser (radiator) that heats the air at the time of the heating operation. The internal heat exchanger 2 can be, for example, a fin and tube fin heat exchanger, consisting of a transfer tube and multiple fins.

The indoor fan 3 is configured to absorb indoor air into the indoor unit 101 and supply as air conditioner air that has exchanged heat with the refrigerant in the indoor heat exchanger 2, to an area subject to air conditioning. The indoor fan 3 includes a fan or the like that is capable of modifying the air flow to be conditioned, to be supplied to the indoor heat exchanger 2.

The outdoor unit 102 includes at least one condenser 4, an outdoor heat exchanger 5 and a regulating device 7. An outdoor fan 6 is arranged in the vicinity of the outdoor heat exchanger 5.

The capacitor 4 is a capacitor capable of varying its operating capacity and, for example, can be a positive displacement compressor driven by a motor (not shown) controlled by an inverter. The condenser 4 is arranged between the external heat exchanger 5 and the internal heat exchanger 2.

The external heat exchanger 5 is configured to function as a condenser (radiator) and transfers heat to the air at the time of the cooling operation, and to function as an evaporator by cooling the air at the time of the heating operation. The external heat exchanger 5 can be, for example, a fin and cross fin type tube heat exchanger, consisting of a transfer tube and multiple fins.

The outdoor fan 6 is configured to absorb outside air to the outdoor unit 102 and expel air that has exchanged heat with the refrigerant in the outdoor heat exchanger 5 to the outside. The external fan 6 is arranged in the external heat exchanger 5 and is composed of the fan or the like, which is capable of modifying the air flow to be supplied to the external heat exchanger 5.

The regulating device 7 is capable of modifying the degree of opening of the regulator, and is configured to regulate the flow rate of the refrigerant flowing into the refrigerant cycle. The regulating device 7 is arranged between the external heat exchanger 5 and the internal heat exchanger 2.

In addition, as shown in Figure 1, the condenser 4, the external heat exchanger 5, the regulating device 7 and the internal heat exchanger 2 are connected in series in a circular path by coolant tubes 103 and constitute the cycle of the refrigerant. Therefore, the air conditioning apparatus 100 is configured to carry out the cooling or heating operation by circulating the refrigerant in the refrigerant cycle. While the refrigerant cycle is shown in Figure 1 at the time of a cooling operation, it goes without saying that the operation can be properly switched to a heating operation using a four-way valve (not shown).

In the air conditioning apparatus 100, condensed water 13 is formed on the surface of the internal heat exchanger 2 due to the increase in the surface temperature in the internal heat exchanger 2, especially at the time of the cooling operation, and collect in a drain pan 9 as drain water 12. The drain water 12 collected in the drain pan 9 is arranged to be properly drained by a drain pump 10, so that the drain water 12 is prevented from overflowing from the drain pan 9 and falling into a subject area to air conditioning (not shown, for example, a room). Next, the configuration of the indoor unit 101 (separate configuration of the refrigerant cycle) will be described.

[Configuration of the indoor unit 101 (separate configuration of the refrigerant cycle)] As shown in Figure 1, the indoor unit 101 includes the drain pan 9, the drain pump 10, a speed sensing device 16 of rotation, a water level detection device 11, a drain conduit 22, a controller 60 and a display unit 70, apart from the fan 3, described above.

The drain pan 9 is configured to collect the condensed water 13 formed on the inner heat exchanger 2 as drain water 12. The drainage water 12 of the drainage tray 9 increases in the amount corresponding to the condensed water 13 that falls from the internal heat exchanger 2, and decreases in the amount drained by the drain pump 10. The position for mounting the drain pan 9 may be under the internal heat exchanger 2, substantially in the perpendicular direction, as shown in Figure 1.

The drain pump 10 is configured to drain the drain water 12 from the drain pan 9, outwardly from the indoor unit 101. The position for mounting the drain pump 10 may be on the drain pan 9, substantially in the perpendicular direction, as shown in Figure 1. The drain pump 10 includes a housing 20, a motor 17, a shaft 18 and a rotor 21.

The wrapping body 20 is formed with an inlet opening 14 to suction the drain water 12 and a discharge opening 15 to drain the drain water 12. The housing 20 is also provided with the rotor

21. The inlet opening 14 is configured to suck the drain water 12 collected in the drain pan 9 into the housing 20. The inlet opening 14 is preferably arranged, for example, in a position in front of a bottom surface of the drain pan 9, as shown in Figure 1. The discharge opening 15 is configured to drain outside the casing body 20 the drain water 12 suctioned to the casing body 20. The discharge opening 15 is connected to the drain conduit 22.

Motor 17 is configured to rotate shaft 18 by the power supplied thereto. Motor 17 is connected to a power source (not shown). The motor 17 is also controlled by the controller 60, in the same way as the indoor fan 3.

Shaft 18 is configured to connect motor 17 and rotor 21 and transmit a rotational force of motor 17 to rotor 21. In other words, since shaft 18 is connected to rotor 21, rotor 21 is configured to rotate together with the axial rotation of the shaft 18.

The rotor 21 is configured to, by its own rotation, suction the drain water 12 through the inlet opening 14 to the enclosure 20 and to drain the sucked drain water 12 from the discharge opening 15. Since the rotor 21 is substantially disk-shaped and its center is fixed to be concentric with the axis 18, the rotor 21 rotates together with the rotation of the axis 18.

The rotation speed detection device 16 is configured to detect the rotation speed of the axis 18. The rotation speed detection device 16 is configured to send to the controller 60 the rotation speed of the detected axis 18, as data A of the rotation speed. The rotation speed detection device 16 is also preferably mounted, for example, next to the axis 18. The description will be made with the air conditioning apparatus 100 using a system with a magnet (not shown) coupled to the axis 18, wherein the rotation speed of the axis 18 is detected by the device 16 for detecting the rotation speed by detecting the change in the magnetic field generated by the rotation of the magnet. The method of detecting the rotation speed of the axis 18 is not specifically limited to the system described above.

The water level detection device 11 is configured to detect the water level of the drain water 12 collected in the drain tray 9. The water level detection device 11 is configured to send to the controller 60 the level of water detected in the drain water 12 of the drain pan 9, as water level data C. The water level detection device 11 is preferably mounted, for example, on the drain pan 9 in the perpendicular direction. Since the water level of the drain pan 9 can be detected by the rotation speed detection device 16 by detecting the rotation speed of the axis 18, the water level detection device 11 may not be provided.

The drain conduit 22 is configured to drain the drain water 12 drained from the discharge opening 15 to the outside of the indoor unit 101. The drain conduit 22 is connected at one end thereof to the discharge opening 15, and the other end of the drain conduit 22 is preferably located, for example, outside the area subject to air conditioning (for example, outside) .

The controller 60 is configured to control the rotations of the indoor fan 3 and the motor 17 and the display of the display unit 70. The controller 60 receives the rotation speed data A from the rotation speed detection device 16 and sends a signal A2 indicative of the drain failure to control the display unit 70 based on the speed data A rotation. More specifically, the controller 60 is configured to determine whether or not there is a drain failure symptom based on the rotation speed data A, and if it determines that there is a drain failure symptom, it sends signal A2 indicative of drain failure to display unit 70. The signal A2 indicative of drain failure is a control signal to be displayed in the display unit 70 in order to notify the user of the fact that there is a drain failure symptom of the drain pump 10.

The controller 60 receives the water level data C from the water level detection device 11, and sends a repair indication signal C2 to control the display unit 70 and a stop signal D to control the indoor fan 3 and condenser 4 based on data C of the water level. More specifically, the controller 60 determines whether or not the water level is above a predetermined level based on the data C of the water level, and if it determines that it is above a predetermined water level, sends the signal C2 of the repair indication to the display unit 70 and sends the stop signal D to the indoor fan 3 and to the condenser 4.

The repair indication signal C2 is a control signal to be displayed in the display unit 70 in order to notify the user about the fact that the water level of the drain water 12 in the drain pan 9 is above the predetermined level. In addition, the stop signal D is a control signal to stop the operations of the indoor fan 3 and the condenser 4 in order to prevent the drain water 12 from the drain tray 9 from leveling up and overflowing from the tray 9 drainage

The display unit 70 is configured to receive the drain fault indication signal A2 and the repair indication signal C2 from the controller 60, so that it notifies the user about the drain failure symptom of the drain pump 10 and requests the user to perform maintenance in advance, or notifies the user of the fact that maintenance is required when the water level of the drain water 12 of the drain tray 9 has increased to a level above the predetermined value. Although the description is made with the display unit 70 arranged in the indoor unit 101, it can be arranged in a remote control (not shown). It is also possible to request the user to perform the maintenance or to notify about the fact that maintenance is required using a voice or similar sound, and therefore the display unit 70 does not have to be arranged.

[Function description]

Next, the treatment of the drainage water 12 in the cooling operation of the air conditioning apparatus 100 will be described.

When the cooling operation begins, the surface temperature of the internal heat exchanger 2 decreases. Next, the air sucked to the indoor unit 101 by the indoor fan 3 is sent to the indoor heat exchanger 2 and cooled therein. When the temperature of the cooled air reaches the dew point or lower, condensed water 13 is formed on the surface of the internal heat exchanger 2 from the air humidity, and is collected in the drain pan 9 as drain water 12 . The drain water 12 collected in the drain pan 9 is properly drained by the drain pump 10. At this time, if the drainage path becomes clogged, the viscosity of the drainage water 12 increases or the drainage capacity of the drainage pump 10 decreases, the rotation speed of the axis 18 decreases correspondingly.

The rotation speed detection device 16 detects the rotation speed of the axis 18, and sends the rotation speed data A based on the rotation speed of the axis 18 to the controller 60. When the controller 60 determines that the data A of the rotation speed contain a symptom of drain failure, the controller 60 sends signal A2 indicating drain drain to the display unit 70. The display unit 70 displays an indication that notifies the user about the fact that there is a drain failure symptom of the drain pump 10, upon receipt of the signal A2 indicating drain failure. When the drain pump 10 shows a drain failure symptom, the display unit 70 detects the symptom and asks the user to perform maintenance in advance, as described above.

If the water level of the drain water 12 of the drain pan 9 increases to the predetermined value, the controller 60 sends the stop signal D to the indoor fan 3 and to the condenser 4 to stop the operations of the indoor fan 3 and the condenser 4, and sends the repair indication signal C2 to the display unit 70 to cause the display unit 70 to notify the user about the fact that maintenance is required.

[Drain Failure]

Drainage failure is a phenomenon in which the amount of water drained by the drainage pump 10 decreases due to a blockage in the drainage path (the casing 20 and the drainage duct 22) (drain state S1) , an increase in the viscosity of the drainage water 12 (drain state S2) or a drop in the drain capacity of the drain pump 10 (drain state S3). In the air conditioning apparatus 100, the controller 60 compares the rotation speed of the axis 18 with the predetermined reference fault of the rotation speed V and determines the presence or absence of a drain failure symptom (any of state S1 drain to drain state S3) of drain pump 10, based on the result of the comparison. If it determines that a drain failure symptom is present, the controller 60 controls the display unit 70 to display that a drain failure symptom exists, so that the user is notified.

When the motor 17 is driven at a uniform voltage, there may be a case in which the rotational speed that determines the drain failure symptom may change, due to the distance from the inlet opening 14 to the bottom surface of the tray 9 drainage, or the length (fluid load) of the drainage conduit 22 or the like. In such a case, the reference value of the rotation speed V can be calculated from the rotation speed of the air conditioning apparatus 100 when initially installed and operating normally.

There is also a case in which the rotation speed that determines the symptom of drainage failure can vary when the components constituting the drain pump 10 are replaced or when the drain conduit 22 is replaced. In such a case, the controller 60 may be configured to be able to determine and modify (update) the predetermined reference value of the rotation speed V.

It is also possible to configure the controller 60 to be able to increase the output of the motor 17 by increasing the voltage supplied from the power supply to the motor 17 when the controller 60 determines that there is a drain failure symptom. By means of increasing the output of the motor 17 in this way, the time margin can be extended until a drainage state S4 is reached in which the drainage water 12 of the drainage tray 9 becomes substantially non-drainable ( reduction of drainage capacity to an unacceptable or lower value).

In addition, two reference values of the rotation speed V can be arranged, so that the controller 60 is able to determine the drainage state S4 in which the drainage can no longer be achieved, as well as the symptom of drainage failures (state S1 drain to state S3 drain) of the drain pump. By using the two reference values of the rotation speed V in this way, the controller 60 determines that the state is the drain state S4 when the rotation speed of the axis 18 drops to a value lower than a second value of reference of the speed of rotation V2. Next, the controller 60 can control the display unit 70 to visualize the fact that the state is the drain state S4, so that the user is notified. When it determines that the drain pump 10 is in the drain state S4, the controller 60 will control the operation of the indoor fan 3 and the condenser 4 to stop it (stopping the air conditioning operation). Therefore, it goes without saying that the water level detection device 11 is no longer necessary because the air conditioning apparatus 100 determines the shutdown of the operation, not depending on the water level of the water drainage water 12 the drain pan 9 detected by the water level detection device 11, but based on the rotation speed of the rotation speed detection device 16.

The controller 60 can be configured to compare the rotation speed of the axis 18 with a series of predetermined reference values of rotation speed, and determine the presence or absence of only one symptom between the drainage states S1 to S4, based on the result of the comparison. By contrast, the controller 60 can be configured to compare the rotation speed of the axis 18 with a single predetermined reference value of the rotation speed, and determine the presence or absence of symptoms of several of the drainage states, based on the result of the comparison. (The number of reference values of the rotation speed, to be provided, is not specifically limited.)

[Advantages of the air conditioning unit 100]

Since the air conditioning apparatus 100 is configured to detect the drain failure symptom by detecting the rotation speed of the drain pump 10, the user can easily control the air conditioning apparatus 100. Furthermore, since the air conditioning apparatus 100 is configured to detect the drain failure symptom of the drain pump 10, it goes without saying that the number of inspection occasions of the drain pump 10 can be reduced.

Realization 2

Fig. 2 is a diagram showing in synthesis a configuration of an air conditioning apparatus 200 according to embodiment 2. Fig. 3 shows an example of a circuit diagram of the engine 17 of the drain pump 10 in the apparatus 200 of air conditioning shown in Fig. 2. In embodiment 2, the same parts as embodiment 1 are indicated by the same reference numbers, and the different points to embodiment 1 are mainly described.

As shown in Figure 3, a controller 201 is connected to an inverter circuit 202 configured to control the rotation speed of the motor 17 and to a current sensor 205 configured to measure the value of the current supplied to the motor. The current sensor 205 can be of a type that is mounted in a K position of the wiring in which it detects the current from the change of the magnetic flux. As shown in Figure 2, the controller 201 receives a value of the current F from the current sensor 205, and sends the signal A2 indicative of drain failure to the display unit 70 based on the current value F.

As the drain failure progresses, the controller 201 increases the switching frequency of the inverter circuit 202, carrying out a feedback control to prevent the rotation of the motor 17. In other words, the current supplied to the pump 10 drainage increases when the drain failure progresses.

In addition, the value of the current F supplied to the motor 17 changes appropriately, so that the symptoms of the drainage states S1 to S4 can be determined by detecting the change in the value of the current F. In other words, in the conditioning apparatus 200 of air, the controller 201 compares the value of the current F supplied to the motor 17 with the predetermined reference value of the current I and determines the presence or absence of the drain failure symptom (any of the drain state S1 to the state S3 of drain) of the drain pump 10 based on the result of the comparison. If it determines that a drain failure symptom is present, the controller 201 controls the display unit 70 to display that a drain failure symptom exists, so that the user is notified. Although the inverter circuit 202 is described as being arranged in the controller 201, the mounting position is not limited.

When the motor 17 is driven at a uniform voltage, there may be a case in which the value of the current that determines the drain failure symptom may change, due to the distance from the inlet opening 14 to the bottom surface of the tray 9 drain, or the length (fluid load) of the drain conduit 22 or the like. In such a case, the reference value of the value of the current I can be calculated from the value of the current of the air conditioning apparatus 200 when it is initially installed and operates normally.

There is also a case in which the value of the current that determines the symptom of drain failure can change when components constituting the drain pump 10 are replaced or when the drain conduit 22 is replaced. In such a case, the controller 201 may be configured to be able to determine and change (update) the predetermined reference value of the current I value.

It is also possible to configure the controller 60 to increase the output of the motor 17 by increasing the voltage supplied from the power supply to the motor 17 when the controller 201 determines that there is a drain failure symptom. By means of increasing the output of the motor 17 in this way, the time margin can be extended until a drainage state S4 is reached in which the drainage water 12 of the drainage tray 9 becomes substantially non-drainable ( reduction of drainage capacity to an unacceptable or lower value).

In addition, two reference values of the current I can be provided, so that the controller 201 is capable of determining the drainage state S4 in which the drainage ceases to be achieved, as well as the symptom of drainage failures (drainage state S1 to drain state S3) of the drain pump. By using the two reference values of the current I in this way, the controller 201 can determine that the state is the drain state S4 when the value of the current F increases to a value greater than a second reference value of current I2. Next, the controller 201 can control the display unit 70 to visualize the fact that the state is the drain state S4, so that the user is notified. When it determines that the drain pump 10 is in the drain state S4, the controller 201 will control the operation of the indoor fan 3 and the condenser 4 to stop it (stopping the air conditioning operation). Therefore, it goes without saying that the water level sensing device 11 is no longer necessary because the air conditioning apparatus 200 determines to stop operation, not based on the water level of the water drainage water 12 the drain pan 9 detected by the water level detection device 11, but based on the current value F supplied to the drain pump 10.

The controller 201 can be configured to compare the current value F of the current supplied to the drain pump 10 with a series of predetermined reference values of the current I and to determine the presence or absence of any symptoms between states S1 to S4 drainage, based on the result of the comparison. In contrast, controller 201 can be configured to compare the current value F for the current supplied to the drain pump 10 with a single predetermined reference value of current I, and determine the presence or absence of symptoms of a series of states of drainage based on the result of the comparison. (The number of reference values of the current I to be provided is not specifically limited.)

[Advantages of the air conditioning unit 200]

Since the air conditioning apparatus 200 is configured to detect the drain failure symptom by detecting the value of the current supplied to the drain pump 10, the user can easily manage the maintenance of the air conditioning apparatus 200. Furthermore, since the air conditioning apparatus 200 is configured to detect the drain failure symptom of the drain pump 10, it goes without saying that the number of inspection occasions of the drain pump 10 can be reduced.

It goes without saying that the contents described in embodiments 1 and 2 can be properly combined.

List of reference signs

2 indoor heat exchanger, 3 indoor fan, 4 condenser, 5 outdoor heat exchanger, 6 outdoor fan, 7 regulator device, 9 drain pan, 10 drain pump, 11 water level sensing device, 12 drain water , 13 condensed water, 14 inlet opening, 15 discharge opening, 16 rotational speed detection device, 17 motor, 18 axis, 20 enclosure, 21 rotor, 22 drain pipe, 60 controller, 70 display unit , 100 air conditioning apparatus, 101 indoor unit, 102 outdoor unit, 103 refrigerant tubes, 200 air conditioning apparatus, 201 controller, 202 inverter circuit, 205 current sensor, A rotation speed data, A2 signal of drain fault indication, C water level data, C2 repair indication signal, D stop signal, S1 drain status, S2 drain status, S3 drain status, S4 drain status, V value reference of the rotation speed, V2 second reference value of the rotation speed, I reference value of the current, I2 second reference value of the current, F current value, K wiring.

Claims (10)

1. An air conditioning apparatus (100) capable of air conditioning operation and provided with a drain pan (9) that collects the condensed water (13) generated in the heat exchanger as water (12) drainage, comprising: a drain pump (10) that drains the drain water (12) collected in the drain pan (9); Y a controller (60) that controls the drain pump (10), characterized in that said controller compares a rotation speed of the drain pump (10) with a predetermined reference value of the rotation speed, and determines the presence or absence of a symptom of drain failure of the drain pump (10) based on the result of the comparison.

2.

 The air conditioning apparatus (100) according to claim 1, wherein the controller (60) calculates the reference value of the rotation speed from the rotation speed of the drain pump (10) when the apparatus (100) air conditioning is initially installed and works normally.

3.

 The air conditioning apparatus (100) according to claim 1 or 2, wherein the controller (60) is capable of changing the reference value of the rotation speed.

Four.

 An air conditioning apparatus (200) capable of the air conditioning operation and provided with a drain pan (9) that collects the condensed water (13) generated in the heat exchanger as water

(12) drainage, comprising: a drain pump (10) that drains the drain water (12) collected in the drain pan (9); Y a controller (201) that controls the drain pump (10), characterized in that said controller compares a value of the current supplied to the drain pump (10) with a predetermined reference value of the current, and determines the presence or absence of a symptom of drain failure of the drain pump (10) based on the result of the comparison. 5. The air conditioning apparatus (200) according to claim 4, wherein the controller (201) calculates the reference value of the current from the current value of the drain pump (10) when the apparatus (200) air conditioning is initially installed and works normally.

6.

 The air conditioning apparatus (200) of claim 4 or 5, wherein the controller (201) is capable of changing the reference value of the current.

7.

 The air conditioning apparatus (200) of any one of claims 1 to 6, wherein when the controller (201) determines that there is a drain failure symptom of the drain pump (10), the controller

(201) performs a control to increase the rotation speed of the drain pump (10).

8.

The air conditioning apparatus (100) according to any one of claims 1 to 3, wherein the controller (60) stops the air conditioning operation when the rotation speed of the drain pump (10) is below a second reference value of the rotation speed that is less than said reference value of the rotation speed.

9.

 The air conditioning apparatus (200) according to any one of claims 4 to 6 or claim 7 when it depends on claims 4 to 6, wherein the controller (201) stops the air conditioning operation when the current value of the drain pump (10) is greater than a second current reference value that is greater than said current reference value.

10.

 The air conditioning apparatus (100, 200) according to any one of claims 1 to 9, wherein when the controller (60, 201) determines that there is a symptom of drainage failure of the drain pump (10), The controller carries out the notification of the drain failure symptom.