JP5212330B2 - Air conditioner - Google Patents

Description

  The present invention relates to an air conditioner, and more particularly, to an air conditioner including a control unit that controls an operating frequency of a compressor.

  In an air conditioner having a control unit that controls the operating frequency of the compressor, when the input current value to the compressor exceeds the first reference value, the operating frequency of the compressor is drooped, and further to the compressor A technique is known in which the operation of the compressor is stopped when the input current value exceeds a second reference value (> first reference value) (see, for example, Patent Document 1).

Japanese Patent Laid-Open No. 10-89782

  However, in the air conditioner disclosed in Patent Document 1, even when the compressor needs to be operated with a high-frequency air conditioning capability, if the input current value related to the high frequency exceeds the reference value, the compression is performed. Since the operating frequency of the machine is lowered or the operation of the compressor is stopped, the air conditioning capability is insufficient, and there is a possibility that the use comfort is lost.

  Therefore, the present invention has been made to solve the above-described problems, and an object thereof is to provide an air conditioner capable of avoiding a lack of air conditioning capability.

In order to solve the above problems, an air conditioner according to a first aspect of the present invention is an air conditioner including a control unit that controls an operating frequency of a compressor, wherein the control unit is an input related to driving of the compressor. A current value detection means for detecting a current value, a storage means for storing a threshold value of the input current value, a comparison between the input current value detected by the current value detection means and a threshold value stored in the storage means Comparing the operating means, the operating capacity changing means for dropping the operating frequency of the compressor when the input current value becomes larger than the threshold value as a result of the comparison by the comparing means, and the operation of the compressor is first. Threshold setting means for changing a threshold value stored in the storage means from a first control value to a second control value larger than the first control value at the start of heating operation after being stopped for a predetermined time or longer. Special It is a sign.

The inventors of the present application pay attention to the fact that the temperature of the electronic component, which is a component of the control unit, gradually increases, and the electronic component is defined even if the compressor is operated at a high frequency for a predetermined time from the start of the heating operation. It has been found that the compressor can be operated at a high frequency because the temperature is not reached. Therefore, in the air conditioner of the present invention, at the start of the heating operation, by performing control to set the threshold value to the second control value, the temperature of the electronic components of the control unit becomes the specified temperature after starting the heating operation. In the meantime, it becomes possible to operate the compressor at a high frequency and to avoid a shortage of air conditioning capability. Therefore, when the operation of the compressor is stopped for a long time and the room temperature is lowered, the air conditioner can perform the heating operation with the high-frequency operation capability. If the compressor operation is stopped for a long time, the temperature of the electronic components in the control unit will also decrease, so the heating operation is performed with a high-frequency operation capability using the time required for the electronic components to reach the specified temperature. It can be performed.
Further, in this air conditioner, it is not necessary to select an electronic component (an electronic component that can tolerate a high current) for operating the compressor at a high frequency, so that the cost of the product can be reduced.

  The air conditioner according to a second aspect of the invention is the air conditioner according to the first aspect of the invention, wherein the threshold value setting means is configured to start the heating operation after the defrosting operation for melting the ice attached to the outdoor heat exchanger is completed. The threshold value is changed from the first control value to the second control value.

  In the case where the room temperature is lowered due to a decrease in air conditioning capability due to the defrosting operation, this air conditioner can perform the heating operation with a high frequency operation capability.

An air conditioner according to a third aspect of the invention is the air conditioner according to the first or second aspect of the invention, further comprising an outside air temperature detecting means for detecting the outside air temperature, wherein the threshold value setting means When the outside air temperature detected by the detection unit is lower than the first predetermined temperature, the threshold value stored in the storage unit is changed from the first control value to the second control value.

  When the outside air temperature is low, the temperature rise of the electronic components in the control unit is slow. Therefore, even if the threshold is set to the second control value and the compressor is operated at a high frequency, the electronic components are kept at the specified temperature in a short time. Never reach. Accordingly, when the outside air temperature is low and it is desired to quickly raise the room temperature, it is possible to operate the compressor at a high frequency by using the time until the electronic component reaches the specified temperature.

An air conditioner according to a fourth aspect of the present invention is the air conditioner according to any one of the first to third aspects, further comprising timer means for measuring a heating operation time, and the threshold setting means is measured by the timer means. Until the heating operation time reaches the second predetermined time, the threshold is set as the second control value, and after the heating operation time measured by the timer means reaches the second predetermined time, the threshold is set as the first control value. .

  In this air conditioner, by limiting the time for which the threshold value is set to the second control value, the operation time at the high frequency operation capacity is limited, and the electronic component of the control unit reaches the specified temperature. Can be deterred.

An air conditioner according to a fifth aspect of the present invention is the air conditioner according to the fourth aspect of the present invention, further comprising an outside air temperature detecting means for detecting an outside air temperature, wherein the threshold setting means is an outside air temperature detected by the outside air temperature detecting means. Becomes higher than the second predetermined temperature, the threshold value is set as the first control value.

  In this air conditioner, when the outside air temperature becomes high and the temperature of the electronic component is likely to rise, the threshold value is set to the first control value even if the heating operation time does not reach the second predetermined time. Limit compressor operation at high frequencies. Thereby, it is possible to prevent the electronic component from reaching the specified temperature.

  As described above, according to the present invention, the following effects can be obtained.

In the first invention, at the start of the heating operation, by performing the control of setting the threshold value to the second control value, the time from the start of the heating operation until the temperature of the electronic components of the control unit reaches the specified temperature The compressor can be operated at a high frequency, and it is possible to avoid a shortage of air conditioning capability. Therefore, when the operation of the compressor is stopped for a long time and the room temperature is lowered, the air conditioner can perform the heating operation with the high-frequency operation capability. If the compressor operation is stopped for a long time, the temperature of the electronic components in the control unit will also decrease, so the heating operation is performed with a high-frequency operation capability using the time required for the electronic components to reach the specified temperature. It can be performed.
In the first invention, since it is not necessary to select an electronic component (an electronic component that can tolerate a high current) for operating the compressor at a high frequency, it is possible to reduce the cost of the product.

  Moreover, in 2nd invention, when room temperature has fallen because air-conditioning capability falls by defrost operation, heating operation can be performed with a high-frequency driving capability.

  Further, in the third invention, when the operation of the compressor is stopped for a long time and the room temperature is lowered, the heating operation can be performed with a high frequency operation capability. If the compressor operation is stopped for a long time, the temperature of the electronic components in the control unit will also decrease, so the heating operation is performed with a high-frequency operation capability using the time required for the electronic components to reach the specified temperature. It can be performed.

  When the outside air temperature is low, the temperature rise of the electronic components in the control unit is slow. Therefore, even if the threshold is set to the second control value and the compressor is operated at a high frequency, the electronic components are kept at the specified temperature in a short time. Never reach. Therefore, in the fourth invention, when the outside air temperature is low and it is desired to quickly raise the room temperature, it is possible to operate the compressor at a high frequency by using the time until the electronic component reaches the specified temperature.

  Further, in the fifth aspect of the invention, by limiting the time for which the threshold value is set to the second control value, the operation time at the high frequency driving capability is limited, and the electronic component of the control unit reaches the specified temperature. Can be suppressed.

  In the sixth invention, when the outside air temperature is high and the temperature of the electronic component is likely to rise, the threshold value is set to the first control value even if the heating operation time does not reach the second predetermined time. To limit the operation of the compressor at high frequencies. Thereby, it is possible to prevent the electronic component from reaching the specified temperature.

The refrigerant | coolant piping figure of the air conditioner which concerns on 1st Embodiment of this invention. The block diagram of the outdoor unit of the air conditioner shown in FIG. The flowchart for demonstrating the setting method of the electric current control value in the air conditioner shown in FIG. The flowchart for demonstrating the setting method of the electric current control value in the air conditioner which concerns on 2nd Embodiment of this invention. The image figure of the graph which showed the relationship between an electric current value and the temperature of an electronic component in the case where external temperature is high and low.

  Hereinafter, an embodiment of an air conditioner according to the present invention will be described based on the drawings.

(First embodiment)
<Overall configuration of air conditioner>
As shown in FIG. 1, the air conditioner 1 of the present embodiment includes an indoor unit 2 installed indoors, an outdoor unit 3 installed outdoor, and a connection pipe that connects the indoor unit 2 and the outdoor unit 3. 4 is provided. And the apparatus and valve accommodated in the indoor unit 2 and the outdoor unit 3, and the connection piping 4 are connected, and the refrigerant circuit is comprised. The refrigerant circuit mainly includes an indoor heat exchanger 20, an outdoor heat exchanger 30, a compressor 31 and an electric expansion valve 32. During the cooling operation, the high-temperature and high-pressure refrigerant discharged from the compressor 31 flows into the outdoor heat exchanger 30. The refrigerant condensed in the outdoor heat exchanger (condenser) 30 is decompressed by the electric expansion valve 32 and then flows into the indoor heat exchanger 20. Then, the refrigerant evaporated in the indoor heat exchanger (evaporator) 20 returns to the suction side of the compressor 31. In this way, the air around the indoor heat exchanger 20 is cooled and cold air is supplied indoors. Further, during the heating operation, the high-temperature and high-pressure refrigerant discharged from the compressor 31 flows into the indoor heat exchanger 20. The refrigerant condensed in the indoor heat exchanger (condenser) 20 is decompressed by the electric expansion valve 32 and then flows into the outdoor heat exchanger 30. Then, the refrigerant evaporated in the outdoor heat exchanger (evaporator) 30 returns to the suction side of the compressor 31. In this way, the air around the indoor heat exchanger 20 is heated and hot air is supplied indoors.

<Indoor unit>
The indoor unit is installed on an indoor wall surface or the like, and includes the indoor heat exchanger 20 described above and an indoor fan 21 for sending out the air heat-exchanged by the indoor heat exchanger 20 into the room.

<Outdoor unit>
The outdoor unit 3 includes an outdoor heat exchanger 30, a compressor 31 that compresses the sucked refrigerant, an electric expansion valve 32 connected to the outdoor heat exchanger 30, and an outdoor unit attached to the outdoor heat exchanger 30. A fan (propeller fan) 33, an accumulator 34 connected to the suction side of the compressor 31, and a four-way switching valve 35 connected to the discharge side of the compressor 31 are provided. The outdoor unit 3 is provided with a liquid closing valve 36 and a gas closing valve 37 to which the connection pipe 4 is connected. The outdoor unit 3 is provided with an outside air temperature sensor (outside air temperature detecting means) 38 for detecting the outside temperature.

  The outdoor unit 3 is provided with a control unit 50 that controls the operation of each actuator mounted on the indoor unit 2 and the outdoor unit 3. As shown in FIG. 2, a fan motor 33 a that drives the outdoor fan 33, a compressor 31, a four-way switching valve 35, an electric expansion valve 32, and an outside air temperature sensor 38 communicate with the control unit 50 by wire or wirelessly. Connected as possible. The control unit 50 includes a CPU (Central Processing Unit) that is an arithmetic processing unit, a control program executed by the CPU and a ROM (Read Only Memory) that stores data used for the control program, and data when the program is executed. RAM (Random Access Memory). Then, the control program stored in the ROM is read into the CPU and executed on the CPU, so that the control program executes the hardware such as the CPU, the current value detection means 51, the storage means 52, the comparison means 53, the operation. The function changing means 54, the threshold setting means 55, the timer means 56, the outside air temperature detecting means 57, and the outside air temperature detecting means 38 are made to function. The current value detection means 51 is for detecting an input current value related to driving of the compressor 31. Here, as the input current value related to the driving of the compressor 31, the value of the current flowing through the electronic component of the control unit 50 is employed. The storage means 52 stores the threshold value of the input current value described above. The comparison unit 53 compares the input current value detected by the current value detection unit 51 with the threshold value stored in the storage unit 52. As a result of the comparison by the comparison unit 53, the operation capacity changing unit 54 droops the operation frequency of the compressor 31 when the input current value becomes larger than the threshold value. And in this embodiment, the threshold value setting means 55 changes the threshold value memorize | stored in the memory | storage means 52 from the current control value A to the current control value B larger than the current control value A at the time of heating operation start. . The current control value A is a threshold value set by default, which is about 10 A, and the current control value B is a compressor when the outside air temperature is lower than a first predetermined temperature (for example, about 4 ° C.). A threshold value set at the start of heating operation after the operation of 31 has been stopped for a first predetermined time (for example, about 10 minutes) or more, and is about 14A. The timer means 56 measures the passage of time. The current control value A described above should be set at a current value at which the temperature of the electronic component does not exceed the specified value under the condition that the temperature of the electronic component rises the most when a sufficient time has elapsed since the start of operation. become.

  Next, a method for setting the current control value by the threshold setting means 55 will be described with reference to the flowchart of FIG.

  When the operation of the compressor 31 is changed from the OFF state to the ON state, it is determined whether or not the operation of the air conditioner 1 is a heating operation (step S1). Various methods such as determining whether or not the heating operation has been started can be determined by determining whether or not a signal related to a heating operation start command transmitted from a remote controller (not shown) has been received. When the heating operation is started (step S1: Yes), a time during which the operation of the compressor 31 is in an OFF state (hereinafter referred to as a compressor OFF time) is acquired (step S2). The compressor OFF time may be measured by the timer means 56 described above. In this embodiment, the acquired compressor OFF time is compared with a first predetermined time (for example, about 10 minutes) (step S3), and when the compressor OFF time is equal to or longer than the first predetermined time. Determines whether or not the outside air temperature detected by the outside air temperature sensor 38 is lower than a first predetermined temperature (for example, about 4 ° C.) (step S4). In this embodiment, when the outside air temperature is lower than the first predetermined temperature (step S4: Yes), the threshold value stored in the storage unit 52 is changed from the current control value A to the current control value B (step S5). ). On the other hand, when the compressor OFF time is shorter than the first predetermined time (step S3: No) or when the outside air temperature is equal to or higher than the first predetermined temperature (step S4: No), the threshold value stored in the storage unit 52 is set. The current control value A is maintained (step S13).

  When the threshold value is set to the current control value B, the measurement of elapsed time is started by the timer means 56 (step S6). Then, it is determined whether or not the outside air temperature detected by the outside air temperature sensor 38 is lower than a second predetermined temperature (for example, about 5 ° C.) (step S7), and when the outside air temperature is higher than the second predetermined temperature. (Step S7: Yes), the threshold value stored in the storage means 52 is returned from the current limit value B to the current control value A (Step S13).

  On the other hand, when the outside air temperature is equal to or lower than the second predetermined temperature (step S7: No), the comparison unit 53 detects the input current value related to the driving of the compressor 31 detected by the current value detection unit 51, and the storage unit 52. Is compared with the current control value B stored in (step S8). As a result of the comparison, when the input current value is larger than the current control value B (step S8: Yes), the operation capacity changing means 54 droops the operation frequency of the compressor 31 (step S9). On the other hand, if the input current value is equal to or smaller than the current control value B (step S8: No) as a result of the comparison, it is determined whether or not the operating frequency has been drooped (step S10). When the drooping of the frequency has already been performed (step S10: Yes), the drooping operation frequency is returned to the normal state (step S11), and when the drooping of the operation frequency is not performed (step S11). S10: No), the current operating frequency is maintained.

  Next, it is determined whether or not the elapsed time since the setting of the current control value B measured by the timer means 56 has exceeded a second predetermined time (for example, 60 minutes) (step S12). When the second predetermined time is exceeded (step S12: Yes), the threshold value setting means 55 changes the threshold value stored in the storage means 52 from the current control value B to the current control value A (step S13). On the other hand, when the elapsed time after setting the current control value B is equal to or shorter than the second predetermined time (step S12: No), the determination in step S7 is repeated again, and the threshold remains the current control value B. maintain.

  Next, the comparison means 53 compares the input current value related to the driving of the compressor 31 detected by the current value detection means 51 with the current control value A stored in the storage means 52 (step S14). As a result of the comparison, when the input current value is larger than the current control value A (step S14: Yes), the operation capacity changing means 54 droops the operation frequency of the compressor 31 (step S15). On the other hand, if the input current value is equal to or less than the current control value A as a result of the comparison (step S14: No), it is determined whether or not the operating frequency has been drooped (step S16). When the drooping of the frequency has already been performed (step S16: Yes), the drooping operation frequency is returned to the normal state (step S17), and when the drooping of the operation frequency is not performed (step S17). S16: No), the current operating frequency is maintained.

[Features of the air conditioner of this embodiment]
The air conditioner 1 of the present embodiment has the following characteristics.

  In the air conditioner 1 of the present embodiment, at the start of the heating operation, by performing the control of setting the threshold value to the current control value B (steps S1 and S5), the electronic of the control unit 50 is started after the heating operation is started. Until the temperature of the parts reaches the specified temperature, the compressor 31 can be operated at a high frequency, and it is possible to avoid a shortage of air conditioning capability.

  Moreover, in the air conditioner 1 of this embodiment, since it is not necessary to select the electronic component (electronic component which can accept | permit high current) for driving the compressor 31 at high frequency, the cost reduction of a product is realizable. .

  Moreover, in the air conditioner 1 of this embodiment, when the operation of the compressor 31 is stopped for a long time and the room temperature is lowered, the heating operation can be performed with a high frequency operation capability (steps S2 and S3). . If the operation of the compressor 31 is stopped for a long time, the temperature of the electronic component of the control unit 50 is also lowered. Therefore, by using the time required for the electronic component to reach the specified temperature, the high frequency operation capability is achieved. Heating operation can be performed.

  Moreover, in the air conditioner 1 of this embodiment, the threshold value is set to the current control value B when the outside air temperature is low (step S4: Yes). This generally has a relationship that the temperature of the electronic component also increases as the current value increases, but as shown in FIG. 5, the temperature of the electronic component is lower when the outside air temperature is lower even at the same current value. I pay attention to it. That is, when the outside air temperature is low, the electronic component does not reach the specified temperature in a short time even if the compressor 31 is operated at a high frequency. Therefore, in the air conditioner 1 of the present embodiment, when the outside air temperature is low and it is desired to quickly raise the room temperature, the compressor 31 is operated at a high frequency by using the time required for the electronic components to reach the specified temperature. It becomes possible.

  Moreover, in the air conditioner 1 of this embodiment, by restricting the time during which the threshold value is set to the current control value B (steps S6 and S12), the operation time with the high-frequency operation capability is limited, and the control unit 50 electronic components can be prevented from reaching a specified temperature.

  Further, in the air conditioner 1 of the present embodiment, when the outside air temperature becomes high and the temperature of the electronic component easily rises, the threshold value is set even if the heating operation time does not reach the second predetermined time. By limiting the operation of the compressor 31 at a high frequency with the first control value (steps S7 and S13), it is possible to prevent the electronic component from reaching the specified temperature.

(Second Embodiment)

  Next, a method for setting a current control value in the air conditioner according to the second embodiment of the present invention will be described with reference to the flowchart of FIG. In the first embodiment, the threshold value is changed from the current control value B to the current control value A at the start of heating operation after the compressor OFF time is stopped for the first predetermined time or longer. In the second embodiment, The threshold value is changed from the current control value A to the current control value B when the heating operation is started after the defrosting operation for thawing frost attached to the outdoor heat exchanger is completed. In addition, about the structure of the air conditioner of 2nd Embodiment, since it is the same as that of 1st Embodiment, the same number is attached | subjected and the description is abbreviate | omitted. Note that the current control value A of the present embodiment is a threshold set by default and is about 10 A, and the current control value B is when the outside air temperature is lower than a first predetermined temperature (for example, about 4 ° C.). The threshold value set at the start of the heating operation after the defrosting operation is completed, and is about 14A.

  When the defrosting operation of the outdoor heat exchanger 30 is completed, it is determined whether or not the operation of the air conditioner 1 is a heating operation (step S21). When the heating operation is started (step S21: Yes), it is determined whether or not the outside air temperature detected by the outside air temperature sensor 38 is lower than a first predetermined temperature (for example, about 4 ° C.) (step S22). In this embodiment, when the outside air temperature is lower than the first predetermined temperature (step S22: Yes), the threshold stored in the storage unit 52 is changed from the current control value A to the current control value B (step S23). ). On the other hand, when the outside air temperature is equal to or higher than the first predetermined temperature (step S22: No), the threshold value stored in the storage unit 52 is maintained as the current control value A (step S31).

  When the threshold is set to the current control value B, the measurement of the passage of time is started by the timer means 56 (step S24). Then, it is determined whether or not the outside air temperature detected by the outside air temperature sensor 38 is lower than a second predetermined temperature (for example, about 5 ° C.) (step S25), and when the outside air temperature is higher than the second predetermined temperature. (Step S25: Yes), the threshold value stored in the storage means 52 is returned from the current limit value B to the current control value A (step S31).

  On the other hand, when the outside air temperature is equal to or lower than the second predetermined temperature (step S25: No), the comparison unit 53 detects the input current value relating to the driving of the compressor 31 detected by the current value detection unit 51, and the storage unit 52. Is compared with the current control value B stored in (step S26). As a result of the comparison, when the input current value is larger than the current control value B (step S26: Yes), the operating capacity changing means 54 droops the operating frequency of the compressor 31 (step S27). On the other hand, if the input current value is equal to or less than the current control value B as a result of the comparison (step S26: No), it is determined whether or not the operating frequency has been drooped (step S28). If the drooping of the frequency has already been performed (step S28: Yes), the drooped operating frequency is returned to the normal state (step S29), and if the drooping of the operating frequency has not been performed (step S29). S28: No), the current operating frequency is maintained.

  Next, it is determined whether or not the elapsed time since the current control value B measured by the timer means 56 has exceeded a second predetermined time (for example, 60 minutes) (step S30), and the time When the second predetermined time is exceeded (step S30: Yes), the threshold value setting means 55 changes the threshold value stored in the storage means 52 from the current control value B to the current control value A (step S31). On the other hand, when the elapsed time after setting the current control value B is equal to or shorter than the second predetermined time (step S30: No), the determination in step S25 is repeated again, and the threshold remains the current control value B. maintain.

  Then, the comparison means 53 compares the input current value related to the driving of the compressor 31 detected by the current value detection means 51 with the current control value A stored in the storage means 52 (step S32). As a result of the comparison, if the input current value is larger than the current control value A (step S32: Yes), the operating capacity changing means 54 droops the operating frequency of the compressor 31 (step S33). On the other hand, if the input current value is equal to or less than the current control value A as a result of the comparison (step S32: No), it is determined whether or not the operating frequency has been drooped (step S34). When the drooping of the frequency has already been performed (step S34: Yes), the drooping operation frequency is returned to the normal state (step S35), and when the drooping of the operation frequency is not performed (step S35). S34: No), the current operating frequency is maintained.

[Features of the air conditioner of this embodiment]
The air conditioner of this embodiment has the following characteristics.

  In the air conditioner of this embodiment, the threshold value is changed from the current control value A to the current control value B at the start of the heating operation after the defrosting operation for melting the ice attached to the outdoor heat exchanger 30 is completed. When the air conditioning capacity is lowered by the defrosting operation, the room temperature is lowered, and when it is desired to quickly raise the room temperature, the heating operation can be performed with the high frequency operation capacity.

  Moreover, in this embodiment, the effect similar to above-described 1st Embodiment can be acquired other than an above-described effect.

  As mentioned above, although embodiment of this invention was described based on drawing, it should be thought that a specific structure is not limited to these embodiment. The scope of the present invention is shown not only by the above description of the embodiments but also by the scope of claims for patent, and further includes all modifications within the meaning and scope equivalent to the scope of claims for patent.

  For example, in the above embodiment, control is performed to return the current control value B to the current control value A according to the heating operation time measured by the timer means 56, but the present invention is not limited to this, and the electronic component of the control unit 50 Or the ambient temperature of the control unit 50 may be monitored, and control may be performed to return the current control value B to the current control value A when the temperature reaches a predetermined temperature.

  Moreover, in the said embodiment, when heating operation time passed predetermined time, control which returns from the current control value B to the current control value A was performed (step S6, S12), but this invention is not restricted to this, Current control value The time from B to returning to the current control value A may be adjusted by the outside air temperature. That is, when the outside air temperature is low, the temperature rise of the electronic component becomes moderate. Therefore, the time until the current control value B is returned to the current control value A is lengthened, and when the outside air temperature is high, the temperature rise of the electronic component is increased. Therefore, the time until the current control value B is returned to the current control value A is shortened.

  If this invention is utilized, the air conditioner which can avoid that air conditioning capability runs short can be obtained.

1 Air conditioner 38 Outside air temperature sensor (outside air temperature detecting means)
DESCRIPTION OF SYMBOLS 50 Control part 51 Current value detection means 52 Memory | storage means 53 Comparison means 54 Driving ability change means 55 Threshold setting means 56 Timer means

Claims (5)

In an air conditioner equipped with a control unit that controls the operating frequency of the compressor,
The controller is
Current value detecting means for detecting an input current value related to driving of the compressor;
Storage means for storing a threshold value of the input current value;
A comparison means for comparing the input current value detected by the current value detection means with a threshold value stored in the storage means;
As a result of the comparison by the comparison means, when the input current value becomes larger than the threshold value, the operating capacity changing means for drooping the operating frequency of the compressor,
The threshold value stored in the storage means is changed from the first control value to a second control value larger than the first control value at the start of heating operation after the operation of the compressor is stopped for a first predetermined time or more. An air conditioner comprising: a threshold setting unit that performs   The threshold value setting means changes the threshold value from the first control value to the second control value at the start of heating operation after the defrosting operation for thawing the ice adhering to the outdoor heat exchanger is completed. The air conditioner according to claim 1. It further comprises an outside air temperature detecting means for detecting the outside air temperature,
The threshold value setting means sets the threshold value stored in the storage means from the first control value when the outside air temperature detected by the outside air temperature detection means is lower than a first predetermined temperature at the start of heating operation. It changes to 2 control value, The air conditioner of Claim 1 or 2 characterized by the above-mentioned. It further comprises timer means for measuring the heating operation time,
The threshold setting means includes
Until the heating operation time measured by the timer means reaches the second predetermined time, the threshold value is set as the second control value, and after the heating operation time measured by the timer means reaches the second predetermined time It is characterized in that the said threshold value and said first control value, the air conditioner according to any one of claims 1-3. It further comprises an outside air temperature detecting means for detecting the outside air temperature,
The threshold setting means includes
The air conditioner according to claim 4 , wherein when the outside air temperature detected by the outside air temperature detecting means becomes higher than a second predetermined temperature, the threshold value is set as the first control value.

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