JP2006170504A - Air conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air conditioner capable of remarkably reducing remaining of drainage water on a water receiver and preventing generation of slime and water leakage. <P>SOLUTION: This air conditioner comprises a first drain pump 1 for discharging the drainage water accumulated in the water receiver 3 to the outside of a machine, and a second drain pump mounted at a lower portion of the first drain pump 1 and discharging the drainage water remaining in the water receiver 2 without being discharged to the outside of the machine by the drain pump 1, to the outside of the machine, and the first drain pump and the second drain pump are respectively operated for a prescribed time immediately after the stop of the operation of the air conditioner and after the lapse of a prescribed time from the stop to prevent the remaining of water in the water receiver. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an air conditioner equipped with a drain pump that discharges drain water generated in association with the operation of the air conditioner.

  Conventionally, an air conditioner for discharging drain water generated with the operation of the air conditioner to the outside of the apparatus has been proposed (see, for example, Patent Document 1).

In Patent Document 1, when the air conditioner stops, the stop time is measured, and when the stop time becomes equal to or longer than the set time, the centrifugal drain pump is operated to discharge the drain water to the outside. It has become.
JP 2003-185229 A

  However, since centrifugal pumps use a mechanism to push up water using centrifugal force, the transport capacity of water is lost when the centrifugal pump is stopped, and the drain water that has not been pushed up to the distribution pipe that forms a forward gradient is gravity. Return to the water tray and stay.

  For this reason, after the cooling or dehumidifying operation is stopped, if the remaining residual water is left, it may cause slime and the like. Further, the suction port of the drain pump may be blocked by the generated slime or the like, which may cause water leakage.

  Therefore, when a small vacuum pump or the like is used for drain water treatment, water can be retained even when the pump is stopped, so backflow does not occur as described above, and residual water in the water tray can be eliminated. Therefore, it is impossible to discharge a large amount of drain water during cooling or dehumidifying operation. Therefore, water leakage may occur.

  When the existing pump is used as described above, in the drain water treatment method described in Patent Document 1, it is possible to achieve both a large amount of drain water treatment generated in the machine and elimination of the remaining water in the water tray when stopped. Can not.

  An object of the present invention is to provide an air conditioner equipped with a drain pump that can cope with the treatment of a large amount of drain water and can eliminate water remaining in a water tray when operation is stopped.

  In order to solve the above-described conventional problems, an air conditioner of the present invention includes a water tray that stores drain water condensed in a heat exchanger, a pump that discharges drain water to the outside of the machine, and a control unit that controls the pump. The drain pump is composed of a first drain pump and a second drain pump. The second drain pump is provided with a suction port below the first drain pump, and the drain water collected in the water tray is The first drain pump discharges the drain water to the outside, and the first drain pump discharges the drain water remaining in the water tray without being discharged to the outside by the second drain pump.

  As a result, it is possible to achieve both the treatment of a large amount of drain water generated in the machine and the elimination of the remaining water in the water tray when stopped.

  The air conditioner of the present invention can treat a large amount of drain water generated in the machine, and further can eliminate residual water in the water tray when the operation of the air conditioner is stopped. The occurrence of defects due to slime can also be suppressed.

  A first invention is an air conditioner equipped with a water tray for storing drain water condensed in a heat exchanger, a pump for discharging drain water to the outside of the machine, and a control means for controlling the pump, the drain pump Consists of a first drain pump and a second drain pump, and the second drain pump is provided with a suction port below the first drain pump, and by this configuration, it is condensed in a heat exchanger. Consists of a first drain pump that discharges drain water to the outside of the machine and a second drain pump that drains drain water that has not been fully drained by the first drain pump and remains in a deeper location in the water tray. Therefore, a large amount of drain water at the time of cooling or dehumidifying operation is discharged by the first drain pump (such as a centrifugal pump), and the remaining water when the cooling or dehumidifying operation is stopped is discharged by the second drain pump (vacuum pump). , It can be reliably prevented the occurrence of water leakage or slime by emissions insufficient.

  In the second invention, the second drain pump of the first invention is provided on the outdoor unit side. By making this configuration, the second drain pump can be enlarged, and the first Since the remaining water that cannot be completely discharged by the drain pump is reliably discharged by the second drain pump, the amount of remaining water can be made extremely small, and the generation of slime can be suppressed. Furthermore, in a multi-room air conditioner in which a plurality of indoor units are connected, it is not necessary to provide a second drain pump in each indoor unit, so that the same effect can be obtained at low cost.

  The third invention has three-way valves respectively on the suction side and the discharge side of the second drain pump of the first and second inventions, and one of the three-way valves is the suction side or the discharge side of the second drain pump. And the other is open to the atmosphere, and the other is connected to a container for temporarily containing water, and the container has water absorption for guiding drain water from the water tray. There are a pipe and a drain pipe for discharging to the outside of the machine. A check valve is provided in the middle of the water suction pipe and the drain pipe. By using this structure, a vacuum pump with low water resistance is used. Even if it is, since drain water can be reliably discharged without water entering the vacuum pump, generation of slime can be suppressed.

  In the fourth aspect of the invention, in particular, when the heat exchanger provided in the air conditioner unit equipped with the drain pump of the first to third aspects of the invention operates in an operation mode in which it operates as an evaporator of a refrigeration cycle, the operation is The drain pump is operated for a predetermined time immediately after the stop and every time a predetermined time elapses from the stop. With this configuration, the drain water gradually drops from the indoor heat exchanger after the indoor unit operation is stopped. Can be reliably discharged out of the machine and the remaining water in the water tray can be eliminated, so that slime can be reliably prevented.

  The fifth aspect of the invention is an air conditioner provided with automatic operation stop means for automatically stopping operation, particularly of the first to fourth aspects of the invention, and is provided in the unit of the air conditioner equipped with a drain pump. When operating in an operation mode in which the heat exchanger operates as an evaporator of the refrigeration cycle, the drain pump is set to a predetermined value immediately after the operation is stopped by the automatic operation stop means and every time a predetermined time has elapsed since the stop. With this configuration, drain water can be reliably discharged out of the machine even when the cooling or dehumidifying operation is automatically stopped (Thermo OFF), and the remaining water in the water tray can be eliminated. Therefore, generation of slime can be surely prevented.

In the sixth aspect of the invention, the operation frequency of the second drain pump is made lower than the operation frequency of the first drain pump of the first to fifth aspects of the invention. A pump that is regularly used as the first pump and is less durable than the first pump, but that can reduce the remaining amount of drain water that can be discharged, is used as the second pump as an auxiliary, and the remaining amount of drain water is surely The generation of slime can be suppressed.

  The seventh invention operates the first drain pump immediately after the operation of the air conditioner of the fourth to fifth inventions is stopped, and operates the second drain pump after a predetermined time has elapsed since the stop. With this configuration, drain water that gradually drops from the indoor heat exchanger after the indoor unit operation is stopped can be surely discharged to the outside of the machine, and the remaining water in the water tray can be eliminated. , The generation of slime can be surely prevented.

  In the eighth invention, in particular, the second drain pump of the first to seventh inventions is a vacuum pump, and the first drain pump is a vacuum pump or other pump, and a large amount during cooling or dehumidifying operation. The drain water is discharged by the first drain pump (centrifugal pump, etc.), and the remaining water when cooling or dehumidifying operation is stopped is discharged by the second drain pump (vacuum pump). Can be prevented more reliably.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is a schematic configuration diagram of an air conditioner according to a first embodiment of the present invention.

  First, the schematic structure of the air conditioner in a present Example is demonstrated. In Embodiment 1 of the present invention, a separate ceiling cassette type air conditioner will be described.

  In the indoor unit, an indoor fan and an indoor heat exchanger 4 are arranged in the wind circuit, a water tray 3 is arranged under the indoor heat exchanger 4, and the first drain pump 1 and the second drain are placed on the water tray 3. A pump suction port 6 is arranged. A drain drain main pipe 5 is connected to the discharge port of the first drain pump so that the drain water can be discharged out of the machine.

  The second drain pump system 13 includes a second drain pump 2, a drain water tank 9, a second drain pump suction side check valve 8a, a second drain pump drain side check valve 8b, and a second drain pump suction side. It comprises a three-way valve 10a, a second drain pump exhaust-side three-way valve 10b, a second drain pump intake pipe 11a, and a second drain pump exhaust pipe 11b.

  The second drain pump 2 is installed inside the indoor unit, outside the indoor unit, inside the outdoor unit, or outside the outdoor unit. The second drain pump suction port 6, the second drain pump suction side drain water pipe 7a, the second drain pump. The water intake side check valve 8a for water is connected to the water absorption side of the drain water tank 9 in order.

  Further, a drain side check valve 8b for the second drain pump, a discharge drain drain pipe 7b for the second drain pump, and a drain drain main pipe 5 are connected to the drain side of the drain water tank 9 in this order. On the exhaust side of the drain water tank 9, the second drain pump intake pipe 11 a, the second drain pump intake side three-way valve 10 a, and the suction side of the second drain pump 2 are sequentially connected.

Further, the second drain pump exhaust pipe 11 b, the second drain pump exhaust side three-way valve 10 b, and the discharge side of the second drain pump 2 are sequentially connected to the air supply side of the drain water tank 9. One of the second drain pump intake-side three-way valve 10a and the second drain pump exhaust-side three-way valve 10b is open to the atmosphere. At this time, the suction port of the second drain pump is provided below the suction port of the first drain pump. In the drain water tank 9, there is a float switch 12
Is provided.

  Next, the operation of the air conditioner according to the present embodiment will be described with reference to FIGS.

  FIG. 2 is a flowchart showing a control flow of drain water treatment in the first embodiment of the present invention.

  When the air conditioner starts cooling (or dehumidifying) operation (STEP 1), the indoor heat exchanger 4 functions as an evaporator, and the drain water generated by condensation in the indoor heat exchanger 4 is dripped onto the water tray. Therefore, the normal drain pump control (STEP 2) is performed in which the first drain pump 1 is operated for a certain time and then stopped for a certain time. At the same time, the continuation timer is cleared (STEP 3). Thereafter, it is determined whether or not the indoor unit is stopped (STEP 4). If it is operated, the process proceeds to STEP 5, and if it is stopped, the process proceeds to STEP 7.

  In STEP 5, it is determined whether or not the difference between the room temperature and the target room temperature is smaller than -3K. If the difference is smaller than −3K, the room is cooled too much, so the thermo-OFF operation for automatically stopping the compressor is started, and the process proceeds to STEP7.

  If the air conditioner is a multi-type in which a plurality of indoor units are connected to one outdoor unit, a thermo-off operation is performed to prevent refrigerant from flowing into the target indoor unit without stopping the compressor. Move to STEP7. On the contrary, if the difference is -3K or more in STEP5, the process proceeds to STEP6.

  In STEP 6, it is determined whether or not the operation mode is switched from the cooling (or dehumidification) operation to other than the cooling (and dehumidification) operation. If the cooling (or dehumidifying) operation is continued, the process returns to STEP 2, and if the operation mode is switched, the process proceeds to STEP 7. In STEP 7, it is determined whether the cooling (or dehumidification) operation has not been resumed, or whether the difference between the room temperature and the target room temperature is -3K or more. If the cooling (or dehumidifying) operation has been resumed, the process proceeds to STEP2, and if not resumed, the process proceeds to STEP8. If the difference between the room temperature and the target room temperature is -3K or more, the room is warmed, so the thermo-ON operation for automatically operating the compressor is started, and the process proceeds to STEP2. If the air conditioner is a multi-type, a thermo-ON operation is performed so that the refrigerant flows through the target indoor unit, and the process proceeds to STEP2. Conversely, if the difference remains less than −3K, the process proceeds to STEP8. In STEP8, the duration after the indoor unit operation stop, the thermo OFF or the operation mode switching is performed is counted.

  In STEP 9, if the continuation timer is 0.5 minutes or less, the first drain pump 1 is operated (STEP 20), and the process returns to STEP 7. Conversely, if the continuation timer is greater than 0.5 minutes, the process proceeds to STEP10.

  In STEP 10, if the continuation timer is 2 minutes or less, the first drain pump 1 is stopped (STEP 21), the second drain pump system 13 is operated (STEP 22), and the process returns to STEP 7. Conversely, if the continuation timer is larger than 2 minutes, the second drain pump system 13 is stopped (STEP 11), and the process proceeds to STEP 12. In STEP12, if the continuation timer is less than 90 minutes, the process returns to STEP7, and if it is 90 minutes or more, the process proceeds to STEP13.

In STEP13, if the continuation timer is 90.5 minutes or less, the first drain pump 1 is operated (STEP20), and the process returns to STEP7. Conversely, if the duration timer is greater than 90.5 minutes, the process proceeds to STEP14. In STEP 14, if the continuation timer is 92.5 minutes or less, the first drain pump 1 is stopped (STEP 21), the second drain pump 2 is operated (STEP 22), and ST
Return to EP7. Conversely, if the continuation timer is greater than 92.5 minutes, the second drain pump 2 is stopped (STEP 15), and the process proceeds to STEP 16. In STEP16, if the continuation timer is less than 180 minutes, the process returns to STEP7, and if it is 180 minutes or more, the process proceeds to STEP17.

  In STEP 17, if the continuation timer is 180.5 minutes or less, the first drain pump 1 is operated (STEP 20), and the process returns to STEP 7. Conversely, if the duration timer is greater than 180.5 minutes, the process proceeds to STEP18.

  In STEP 18, if the continuation timer is 182.5 minutes or less, the first drain pump 1 is stopped (STEP 21), the second drain pump system 13 is operated (STEP 22), and the process returns to STEP 7. Conversely, if the continuation timer is greater than 182.5 minutes, the second drain pump system 13 is stopped (STEP 19), and the process returns to STEP 7.

  FIG. 3 is a flowchart showing a control flow of the second drain pump system 13 in the first embodiment of the present invention.

  When the second drain pump system 13 starts operation (STEP 31), after the second pump timer is cleared (STEP 32), the second pump timer is increased.

  When the water in the drain water tank 9 is more than the specified amount, the float switch 12 is turned on (STEP 34), and the process proceeds to STEP 50. Conversely, if the float switch 12 is OFF (less than the specified amount), the process proceeds to STEP35.

  In STEP 35, if the second pump timer is 30 seconds or more, the process proceeds to STEP 39, and if it is less than 30 seconds, the second drain pump exhaust side three-way valve 10b is switched to the atmosphere release side (STEP 36), and the second drain pump After switching the intake side three-way valve 10a to the drain water tank side (STEP 37), the second drain pump 2 is operated (STEP 38), and the process returns to STEP 33. As a result, the inside of the drain water tank 9 starts to be evacuated, the drain side check valve 8b for the second drain pump closes, the water suction side check valve 8a for the second drain pump opens, and the drain water remaining in the water tray 3 Is guided from the second drain pump suction port 6 to the drain water tank 9 through the second drain pump suction side drain water distribution pipe 7a.

  In STEP 39, if the second pump timer is 60 seconds or more, the process proceeds to STEP 42, and if it is less than 60 seconds, the second drain pump exhaust side three-way valve 10b is switched to the drain water tank side (STEP 40). The pump intake side three-way valve 10a is switched to the atmosphere release side (STEP 41), and the process returns to STEP 33. Accordingly, in order to start pressurizing the inside of the drain water tank 9, the second drain pump water intake side check valve 8 a is closed, the second drain pump drain side check valve 8 b is opened, and the drain accumulated in the drain water tank 9. Water passes through the drain drain main pipe 5 from the second drain pump discharge side drain water pipe 7b and is drained outside the apparatus.

  In STEP42, if the second pump timer is 90 seconds or more, the process proceeds to STEP45, and if it is less than 90 seconds, the second drain pump exhaust side three-way valve 10b is switched to the atmosphere release side (STEP43), and the second drain pump The intake side three-way valve 10a is switched to the drain water tank side (STEP 44), and the process returns to STEP 3. As a result, the inside of the drain water tank 9 is evacuated again, the second drain pump drain side check valve 8b is closed, the second drain pump suction side check valve 8a is opened, and the drain remaining in the water tray 3 Water is led from the second drain pump suction port 6 to the drain water tank 9 through the second drain pump suction side drain water distribution pipe 7a.

In STEP 45, if the second pump timer is 120 seconds or longer, the second drain pump is stopped (STEP 48), and the operation of the second drain pump system is stopped (STEP 49).
Conversely, if it is less than 120 seconds, the second drain pump exhaust side three-way valve 10b is switched to the drain water tank side (STEP 46), and the second drain pump intake side three way valve 10a is switched to the atmosphere release side (STEP 47). Return to STEP3. Accordingly, in order to start pressurizing the inside of the drain water tank 9, the second drain pump water intake side check valve 8 a is closed, the second drain pump drain side check valve 8 b is opened, and the drain accumulated in the drain water tank 9. Water passes through the drain drain main pipe 5 from the second drain pump discharge side drain water pipe 7b and is drained outside the apparatus.

  In STEP50, when the water in the drain water tank 9 is more than the specified amount, the float switch 12 is turned on and the process proceeds to STEP52. Conversely, if the float switch 12 is OFF (less than the specified amount), the process proceeds to STEP 51.

  In STEP 51, if the second pump timer is 60 seconds or more, the process proceeds to STEP 42. If the second pump timer is less than 60 seconds, the second pump timer is increased (STEP 52), and the second drain pump exhaust side three-way valve 10b is connected to the drain water. Switching to the tank side (STEP 53), switching the second drain pump intake side three-way valve 10a to the atmosphere release side (STEP 54), operating the second drain pump 2 (STEP 55), and returning to STEP 50. Accordingly, in order to start pressurizing the inside of the drain water tank 9, the second drain pump water intake side check valve 8 a is closed, the second drain pump drain side check valve 8 b is opened, and the drain accumulated in the drain water tank 9. Water is discharged from the discharge drain drain pipe 7b for the second drain pump through the drain drain main pipe 5 to the outside of the apparatus, and the second drain pump having low water resistance can be protected from water.

  FIG. 4 is a timing chart when the cooling operation is stopped in the first embodiment of the present invention.

  When the cooling operation is stopped, the first drain pump 1 is operated for 30 seconds immediately after the stop, and the second drain pump system 13 is operated for 120 seconds immediately after the first drain pump 1 is stopped. Thereby, the remaining water of the water tray 3 immediately after a stop can be eliminated. Furthermore, when 90 minutes have passed since the operation stop, the first drain pump 1 is operated for 30 seconds, and the second drain pump system 13 is operated for 120 seconds immediately after the first drain pump 1 is stopped. The drain water accumulated in the indoor heat exchanger 4 can be gradually dropped onto the water tray 3 over time, and the remaining water accumulated can be eliminated. Further, when 180 minutes have passed since the operation was stopped, the first drain pump 1 is operated for 30 seconds, and immediately after the first drain pump 1 is stopped, the second drain pump system 13 is operated for 120 seconds. The drain water accumulated in 4 can be dripped gradually onto the water receiving tray 3 over time, and the remaining water accumulated can be eliminated.

  FIG. 5 is a timing chart when the cooling operation is switched to the heating operation in the first embodiment of the present invention.

  When the cooling operation is switched to the heating operation, the first drain pump 1 is operated for 30 seconds immediately after the switching, and the second drain pump system 13 is operated for 120 seconds immediately after the first drain pump 1 is stopped. Thereby, the remaining water of the water receiving tray 3 immediately after switching can be eliminated. Further, when 90 minutes have elapsed since switching, the first drain pump 1 is operated for 30 seconds, and immediately after the first drain pump 1 is stopped, the second drain pump system 13 is operated for 120 seconds. Immediately after that, the drain water accumulated in a large amount in the indoor heat exchanger 4 gradually drops to the water tray 3 over time, and the remaining water accumulated can be eliminated. Further, when 180 minutes have passed since switching, the first drain pump 1 is operated for 30 seconds, and immediately after the first drain pump 1 is stopped, the second drain pump system 13 is operated for 120 seconds. The drain water accumulated in 4 can be dripped gradually onto the water receiving tray 3 over time, and the remaining water accumulated can be eliminated.

  FIG. 6 is a timing chart when the cooling operation is automatically stopped (thermo OFF) from the cooling operation according to the first embodiment of the present invention.

  When the cooling operation is thermo OFF, the first drain pump 1 is operated for 30 seconds immediately after the thermo OFF, and the second drain pump system 13 is operated for 120 seconds immediately after the first drain pump 1 is stopped. Thereby, the remaining water of the water receiving tray 3 immediately after the thermo OFF can be eliminated. Furthermore, when 90 minutes have passed since the thermo-off, the first drain pump 1 is operated for 30 seconds, and immediately after the first drain pump 1 is stopped, the second drain pump system 13 is operated for 120 seconds. In addition, the drain water accumulated in the indoor heat exchanger 4 can be gradually dropped over the water receiving tray 3 with time to eliminate the remaining water. Furthermore, when 180 minutes have passed since the thermo-off, the first drain pump 1 is operated for 30 seconds, and immediately after the first drain pump 1 is stopped, the second drain pump system 13 is operated for 120 seconds. The drain water accumulated in 4 can be dripped gradually onto the water receiving tray 3 over time, and the remaining water accumulated can be eliminated.

  As described above, in the present embodiment, the remaining water in the water tray can be surely eliminated, and slime can be prevented from being generated.

  In the first embodiment of the present invention, the separate ceiling cassette type air conditioner has been described. However, even if it is an integral type, it is a separate wall hanging type, and drain water is guided to the outdoor unit side. It goes without saying that even the type is technically the same.

  In the first embodiment of the present invention, the intake / exhaust of the drain water tank and the intake / exhaust to the atmosphere are switched by the three-way valve, but it goes without saying that the same operation can be performed even if two or more two-way valves are used. .

  As described above, the present invention can reduce the amount of drain water remaining in the air conditioner, so that it is necessary to discharge the liquid from the inside of the apparatus equipped with a refrigeration cycle such as an air conditioner or from the inside of the apparatus. It can be applied to general equipment.

The schematic block diagram of the air conditioner in the 1st Embodiment of this invention Flow chart of drain water treatment control in the first embodiment of the present invention Flowchart of second drain pump system control in the first embodiment of the present invention Timing chart in the case of stopping from the cooling operation in the first embodiment of the present invention Timing chart when switching from cooling operation to heating operation in the first embodiment of the present invention Timing chart when the cooling operation is automatically stopped (thermo OFF) from the cooling operation in the first embodiment of the present invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 1st drain pump 2 2nd drain pump 3 Water receiving tray 4 Indoor heat exchanger 5 Drain drain main pipe 6 2nd drain pump suction port 7a 2nd drain pump suction side drain water distribution pipe 7b 2nd drain pump discharge side drain Water distribution pipe 8a Second drain pump suction side check valve 8b Second drain pump drain side check valve 9 Drain water tank 10a Second drain pump intake side three-way valve 10b Second drain pump exhaust side three-way valve 11a First drain pump 2 Drain pump intake pipe 11b 2nd drain pump exhaust pipe 12 Float switch 13 2nd drain pump system

Claims (8)

An air conditioner equipped with a water tray for storing drain water condensed in a heat exchanger, a pump for discharging the drain water to the outside of the machine, and a control means for controlling the pump, wherein the drain pump is a first An air conditioner comprising a second drain pump and a second drain pump, wherein the second drain pump is provided with a suction port below the first drain pump. The air conditioner according to claim 1, wherein the second drain pump is provided on the outdoor unit side. There are three-way valves on the suction and discharge sides of the second drain pump, one of the three-way valves is connected to the suction or discharge side of the second drain pump, and the other is opened to the atmosphere. And the other one is connected to a container for temporarily storing water, and the container has a water absorption pipe for guiding drain water from the water tray and a drain pipe for discharging it to the outside of the machine. The air conditioner according to claim 1 or 2, wherein a check valve is provided in the middle of the water absorption pipe and the drain pipe. When operating in the operation mode in which the heat exchanger provided in the air conditioner unit equipped with the drain pump operates as an evaporator of the refrigeration cycle, immediately after the operation stops and every time a predetermined time elapses from the stop The air conditioner according to any one of claims 1 to 3, wherein the drain pump is operated for a predetermined time. An air conditioner having automatic operation stop means for automatically stopping operation, wherein a heat exchanger provided in the air conditioner unit equipped with a drain pump operates as an evaporator of a refrigeration cycle 5. The drain pump is operated for a predetermined time immediately after the operation is stopped by the automatic operation stop means and every time a predetermined time elapses after the operation is stopped. The air conditioner according to any one of the above. The air conditioner according to any one of claims 1 to 5, wherein the operation frequency of the second drain pump is less than the operation frequency of the first drain pump. The first drain pump is operated immediately after the operation of the air conditioner is stopped, and the second drain pump is operated after a predetermined time has elapsed since the stop. Air conditioner. The air conditioner according to any one of claims 1 to 7, wherein the second drain pump is a vacuum pump, and the first drain pump is a vacuum pump or other pump.

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