JP2768148B2 - Operation control device for air conditioner - Google Patents

Operation control device for air conditioner

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Publication number
JP2768148B2
JP2768148B2 JP4169010A JP16901092A JP2768148B2 JP 2768148 B2 JP2768148 B2 JP 2768148B2 JP 4169010 A JP4169010 A JP 4169010A JP 16901092 A JP16901092 A JP 16901092A JP 2768148 B2 JP2768148 B2 JP 2768148B2
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Japan
Prior art keywords
temperature
thermo
counting
low load
load signal
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
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JP4169010A
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Japanese (ja)
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JPH0611173A (en
Inventor
世紀 井上
雅章 竹上
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ダイキン工業株式会社
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Publication of JPH0611173A publication Critical patent/JPH0611173A/en
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Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an operation control device for an air conditioner, and more particularly to a thermo-off control measure.

[0002]

2. Description of the Related Art Conventionally, air conditioners have been disclosed in
As disclosed in Japanese Patent Publication No. 0-152853, a compressor whose capacity is controlled by an inverter, a four-way switching valve,
The outdoor heat exchanger, the electric expansion valve, and the indoor heat exchanger are sequentially connected, and the frequency of the inverter is controlled based on the temperature difference between the indoor temperature and the set temperature to increase or decrease the capacity of the compressor. There is something that is.

When the temperature difference between the room temperature and the set temperature decreases, the air conditioner stops the compressor and enters a thermo-off state.

[0004]

In the above-described air conditioner, the thermo-off control is performed when the indoor temperature is lower than the set temperature by 1 ° C. during the cooling operation, and when the indoor temperature is higher by 1 ° C. than the set temperature during the heating operation. Then, the timer is operated to perform the residual operation, and when this temperature state continues for 3 minutes, the compressor is stopped.

However, normally, the temperature of the intake air of the indoor unit is controlled by regarding it as the indoor temperature, and the temperature of the intake air does not always coincide with the temperature of the entire room due to air flow distribution and the like. For example, a short circuit may occur. Therefore, if only a constant residual operation is performed as in the related art, the thermo-off may occur even though the entire room is not in a predetermined air-conditioning state, and there has been a problem that comfortable air-conditioning cannot be performed.

[0006] The present invention has been made in view of such a point, and an object of the present invention is to improve the comfort by making the thermo-off start timing variable.

[0007]

Means for Solving the Problems In order to achieve the above object, the measures taken by the present invention are to change the remaining operation time in accordance with the room temperature.

More specifically, as shown in FIG. 1, means taken by the invention according to claim 1 firstly includes a variable capacity compressor (1).
, A heat source side heat exchanger (3), an expansion mechanism (5), and a use side heat exchanger (6) are sequentially connected to an air conditioner provided with a refrigerant circuit (9). Further, a temperature detecting means (Thr) for detecting the indoor temperature is provided. Furthermore,
When a plurality of thermo-off temperatures are set with different temperature differences from the set temperature, and the room temperature detected by the temperature detecting means (Thr) reaches each thermo-off temperature when the compressor (1) has the minimum capacity, the respective thermo-off temperatures are set. A low load detecting means (11) for outputting each low load signal corresponding to the thermo-off temperature is provided. In addition, the output time of each low load signal of the low load detection means (11) is continuously counted, and the counting operation for the low load signal close to the set temperature is set to be long, and the counting operation is performed. A counting means (12) for outputting a time-up signal upon completion is provided. In addition, the counting means
Upon receiving the time-up signal of (12), the refrigerant circuit (9)
Is provided with a thermo-off means (13) for setting the thermo-off state.

The means adopted by the invention according to claim 2 is the low load detection means (11) according to the invention of claim 1.
However, a first thermo-off temperature having a small temperature difference with respect to a set temperature and a second thermo-off temperature having a large temperature difference are set, and based on a first low load signal based on the first thermo-off temperature and a second thermo-off temperature. It is configured to output a second low load signal. Meanwhile, counting means (12)
A long timer T6 that sets a long counting time to count the output time of the first low load signal, and a short timer T5 that sets a short counting time and counts one output time of the second low load signal. It is composed of

[0010]

According to the first aspect of the present invention,
First, in the refrigerant circuit (9), for example, the liquid refrigerant condensed and liquefied in the heat source side heat exchanger (3) is decompressed by the expansion mechanism (5), and then evaporated in the use side heat exchanger (6). And return to the compressor (1). During this air-conditioning operation, the temperature detecting means (Thr) constantly detects the indoor temperature, the indoor temperature detected by the temperature detecting means (Thr) is received by the low load detecting means (11), and the low load detecting means (11) receives the indoor temperature. (11) The indoor temperature is the compressor (1)
It is determined whether or not a plurality of preset thermo-off temperatures have been reached at the time of the minimum capacity. Specifically, in the invention according to claim 2, it is determined whether or not the first and second thermo-off temperatures have been reached. ing. When the room temperature reaches the first thermo-off temperature or the second thermo-off temperature, the low load detection means (11) outputs a first low load signal or a second low load signal.

When the first low load signal or the second low load signal is output, the counting means (12) starts a counting operation, and
The long timer T6 is activated for the low load signal, and the short timer T5 is activated for the second low load signal. Thereafter, when the first low-load signal or the second low-load signal is continuously output and either the long timer T6 or the short timer T5 times out, a time-up signal is output and the time-up signal is thermo-off. Means (1
3) is received and the refrigerant circuit (9) is thermo-off state. In other words, the smaller the temperature difference between the room temperature and the set temperature, the longer the operation time of the minimum capacity of the compressor (1) and the more the thermostat is turned off.

[0012]

According to the first and second aspects of the present invention, the smaller the temperature difference between the room temperature and the set temperature is, the longer the operation time until the thermo-off is made. When it is close, the residual operation can be performed for a long time, and when the room temperature is different from the set temperature, the residual operation can be performed for a short time. As a result, since the entire room can be air-conditioned to the set temperature substantially uniformly, the adverse effects of the short circuit and the airflow distribution can be eliminated, and the comfort can be improved.

[0013]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 2 shows a refrigerant piping system of an air conditioner to which the present invention is applied, which is a so-called separate type in which one outdoor unit (A) is connected to one indoor unit (B).

The outdoor unit (A) includes a scroll type compressor (1) whose operating frequency is variably adjusted by an inverter, and a cutoff as shown by a solid line in the cooling operation and a broken line in the heating operation. Replacement four-way switching valve (2)
And an outdoor heat exchanger that is a heat source side heat exchanger that functions as a condenser during cooling operation and as an evaporator during heating operation.
(3) and a decompression unit (20) for decompressing the refrigerant are arranged as main devices. The indoor unit (B) has
An indoor heat exchanger (6), which is a use side heat exchanger that functions as an evaporator during cooling operation and as a condenser during heating operation, is arranged. And the compressor (1) and the four-way switching valve
(2), the outdoor heat exchanger (3), the pressure reducing section (20), and the indoor heat exchanger (6) are sequentially connected by a pipe (8) so that heat is transferred by circulating the refrigerant. The refrigerant circuit (9) is configured.

Here, the pressure reducing section (20) includes a bridge-shaped rectifier circuit (8a) and a pair of connection points in the rectifier circuit (8a).
(P, Q) connected to a common path (8a), said common path (8a)
There is a receiver (4) for storing the liquid refrigerant, an auxiliary heat exchanger (3a) for the outdoor heat exchanger (3), and an electric expansion which is an expansion mechanism having a function of reducing the pressure of the liquid refrigerant and a function of adjusting the flow rate. Valve (5)
And are arranged in series. And the rectifier circuit (8a)
The other pair of connection points (R, S) in
The pipe (8) on the (3) side and the pipe (8) on the indoor heat exchanger (6) side are connected. Further, the rectifier circuit (8a) connects the upstream connection point (P) of the common path (8a) and the connection point (S) on the outdoor heat exchanger (3) side, and connects the rectifier circuit (8a) from the outdoor heat exchanger (3). Indoor heat exchange between a first inflow path (8b1) having a first check valve (D1) allowing only refrigerant flow to the receiver (4) and an upstream connection point (P) of the common path (8a); Indoor heat exchanger (6) by connecting to the connection point (R) on the side of the heat exchanger (6)
A second inflow path (8b2) provided with a second check valve (D2) that allows only refrigerant flow from the receiver to the receiver (4); a downstream connection point (Q) of the common path (8a); A first check valve (D3) having a third check valve (D3) connecting the connection point (R) on the side of the exchanger (6) and allowing only refrigerant to flow from the electric expansion valve (5) to the indoor heat exchanger (6); Outflow channel (8
c1), the downstream connection point (Q) of the common path (8a) and the connection point (S) on the outdoor heat exchanger (3) side, and the electric expansion valve (5) is connected to the outdoor heat exchanger (3 And a second outflow path (8c2) provided with a fourth check valve (D4) that allows only the flow of the refrigerant to (c).

The common path (8) in the rectifier circuit (8a)
a) Capillary tube (C) between both connection points (P, Q)
A liquid ring prevention bypass path (8f) is provided,
The liquid ring prevention bypass path (8f) prevents liquid ringing when the compressor (1) is stopped, while opening and closing the upper part of the receiver (4) and the downstream side of the common path (8a). A gas vent path (4a) provided with a valve (SV) is connected. The degree of pressure reduction of the capillary tube (C) is set to be sufficiently larger than that of the electric expansion valve (5), so that the refrigerant flow control function of the electric expansion valve (5) during normal operation is maintained well. It has been made possible. (F1 to F5) are filters for removing dust in the refrigerant, and (ER) is a muffler for reducing the operation noise of the compressor (1).

Further, the air conditioner is provided with sensors and the like. (Thd) is a discharge pipe sensor that is disposed on the discharge pipe of the compressor (1) and detects the discharge pipe temperature Td. Is
An outdoor suction sensor that is disposed at the air suction port of the outdoor unit (A) and detects the suction air temperature Ta, which is the outside air temperature, (Thc)
Is disposed in the outdoor heat exchanger (3), and detects an external heat exchange temperature Tc which becomes a condensing temperature during the cooling operation and becomes an evaporating temperature during the heating operation, and (Thr) is an indoor unit.
(B) an indoor suction sensor (temperature detecting means) arranged at the air suction port and detecting the suction air temperature Tr which is the indoor temperature;
(The) is disposed in the indoor heat exchanger (6), the internal heat exchange sensor that detects the internal heat exchange temperature Te that becomes the evaporating temperature during the cooling operation and becomes the condensing temperature during the heating operation, and (HPS) is the high pressure A high pressure switch that detects a refrigerant pressure and outputs a high pressure signal by being turned on by an excessive rise of the high pressure refrigerant pressure, (LPS)
Is a low-pressure switch that detects the low-pressure refrigerant pressure and turns on when a low-pressure refrigerant pressure is excessively low to output a low-pressure signal. The output signals of the sensors (Thd, to, The) and the switches (HPS, LPS) are input to a controller (10), and the controller (10) performs an air-conditioning operation based on the input signals. It is configured to control.

In the above-described refrigerant circuit (9), during the cooling operation, the liquid refrigerant condensed and liquefied in the outdoor heat exchanger (3) flows in from the first inflow passage (8b1) and the first check valve (D1). ), Is stored in the receiver (4), decompressed by the electric expansion valve (5), then evaporates in the indoor heat exchanger (6) through the first outflow path (8c1) and returns to the compressor (1). On the other hand, during heating operation,
The liquid refrigerant condensed and liquefied in the indoor heat exchanger (6) flows in from the second inflow path (8b2) and passes through the second check valve (D2) to the receiver.
After being stored in (4) and depressurized by the electric expansion valve (5),
After evaporating in the outdoor heat exchanger (3) via the outflow channel (8c2), the compressor
The cycle returns to (1).

On the other hand, the controller (10) is provided with a low load detecting means (11) for controlling the thermo-off operation, a counting means (12), and a thermo-off means (13) as features of the present invention. I have. Then, the controller (10) controls the capacity of the compressor (1) by dividing the operating frequency of the inverter into 20 steps N from zero to the maximum frequency, and setting each step N based on the discharge pipe temperature Td. It is configured to be. On the other hand, the low-load detecting means (11) is provided with a low-load detecting means (11) in which the temperature difference ΔTr with respect to the set temperature Ts is small.
A thermo-off temperature and a second thermo-off temperature having a large temperature difference ΔTr are set, and specifically, 1 to the set temperature Ts.
The first thermo-off temperature is low during cooling and high during heating.
A second thermo-off temperature that is lower during cooling by 2 ° C. and higher during heating than the set temperature Ts is set, and the indoor suction sensor (T
hr) outputs a first low-load signal when the suction air temperature Tr reaches the first thermo-off temperature, and outputs a second low-load signal when the suction air temperature Tr reaches the second thermo-off temperature. The counting means (12) counts the output time during which each low load signal of the low load detection means (11) is continuously output, and sets a long counting operation for the low load signal close to the set temperature Ts. When the counting operation is completed, a time-up signal is output. Specifically, the counting time is set to 7 minutes, and the output time during which the first low load signal is continuously output is counted. And a short timer T5 for counting the output time during which the second low load signal is continuously output with the counting time set to 3 minutes, which is short. The thermo-off means (13) is configured to, upon receiving a time-up signal from the counting means (12), put the refrigerant circuit (9) in a thermo-off state.

Next, the thermo-off control operation in the air conditioner during the heating operation will be described based on the control flow of FIG. This control flow is performed every 10 seconds. First, in step ST1, it is determined whether or not the start control completion flag F2 is set. The completion flag F2 is set when the start control is completed. Therefore, the process proceeds to step ST2 until the start control is completed, and returns after performing abnormal processing of the discharge pipe temperature Td of the compressor (1).
When the start control is completed, the completion flag F2 is set, and the process proceeds from step ST1 to step ST3 to determine whether or not the abnormality flag FTr of the indoor suction sensor (Thr) is set. If the abnormality flag FTr is set, the process directly returns to step ST2 and returns. If the abnormality flag FTr is not set, the process proceeds to step ST2.
The process proceeds from step ST3 to step ST4, where it is determined whether or not the defrost end flag FD2 is set. Since the defrost end flag FD2 is set for three minutes after the end of defrost, the defrost end flag FD2 is set. If so, the process proceeds to step ST2 and returns. On the other hand, if the defrost end flag FD2 has been reset, the process proceeds from step ST4 to step ST5.

In step ST5, since the indoor suction sensor (Thr) constantly detects the suction air temperature Tr, the low load detecting means (11) determines whether the suction air temperature Tr is equal to the set temperature.
It is determined whether or not the temperature difference ΔTr between the intake air temperature Tr and the set temperature Ts has exceeded the second thermo-off temperature higher by 2 ° C. than Ts. Until the temperature difference ΔTr exceeds the second thermo-off temperature of 2 ° C., the determination in step ST5 is NO.
Then, the process proceeds to step ST6, where the short timer T5 is reset, and the process proceeds to step ST7. Next, the low load detecting means (11) determines whether or not the temperature difference ΔTr between the intake air temperature Tr and the set temperature Ts has exceeded the first thermo-off temperature which is higher by 1 ° C. The first temperature difference ΔTr of 1 ° C.
Until the temperature exceeds the thermo-off temperature, the determination in step ST7 is NO, the process proceeds to step ST8, the long timer T6 is reset, and the process proceeds to step ST9.

Subsequently, in step ST9, it is determined whether the short timer T5 has counted 10 seconds or whether the long timer T6 has counted 20 seconds. Since both the timers T6 are in the reset state, the process directly proceeds to the step ST2 and returns. That is, the operating frequency step N of the compressor (1) is set in accordance with the current heating load so that the suction air temperature Tr becomes the set temperature Ts.

Thereafter, during the heating operation, as shown in FIG. 4, the intake air temperature Tr rises and the set temperature Ts
When the temperature difference ΔTr from the set temperature Ts exceeds the first thermo-off temperature higher by 1 ° C. (see point A), the above-mentioned step ST7 is performed.
The low load detecting means (11) detects the low load and
A low load signal is output, and the determination becomes YES. Then, the process proceeds from step ST7 to step ST10, where the long timer T6
It is determined whether or not is in the counting state, and if it is in the reset state, the process proceeds to step ST11, where the long timer T6 is started and proceeds to step ST9. To step ST9
Will be moved to.

In step ST9, it is determined whether or not the long timer T6 has counted 20 seconds as described above.
Until the 20 seconds are counted, the process directly proceeds to step ST2 and returns. On the other hand, if the long timer T6 counts 20 seconds, the determination in step ST9 becomes YES, and the process proceeds to step ST12 to operate the compressor (1). Frequency step N
Is determined to be the minimum step Nmin. And
If the operation frequency step N is not the minimum step Nmin, the process proceeds from step ST12 to step ST13, sets the thermocontrol variable dN5 to “−2” and proceeds to step ST14, and executes the short timer T5 and the long timer T6. Is reset, and the process returns to step ST2. That is, when the intake air temperature Tr rises and becomes 1 ° C. higher than the set temperature Ts, as shown in FIG. 5B, the operating frequency step N of the compressor (1) is decreased by two every 20 seconds.

When the operating frequency step N decreases, the intake air temperature Tr further increases and the set temperature
If the temperature difference ΔTr from Ts exceeds the second thermo-off temperature higher by 2 ° C., in step ST5, the low load detecting means (11)
Outputs a second low load signal, and the determination becomes YES. Then, the process proceeds from step ST7 to step ST15, and determines whether or not the short timer T5 is in a counting state. If the short timer T5 is in a reset state, the process proceeds to step ST16, starts the short timer T5, and proceeds to step ST10. Thereafter, when the short timer T5 enters the counting state, the above-described step ST15
Then, the process proceeds to step ST10, where it is determined whether or not the long timer T6 is in the counting state, and the above operation is repeated. That is, when the suction air temperature Tr rises further, it is also determined in step ST9 whether or not the short timer T5 has counted 10 seconds. Each time the short timer T5 has counted 10 seconds, the compressor (1) The operating frequency step N is reduced by two.

Thereafter, when the operating frequency step N of the compressor (1) becomes the minimum step Nmin while the suction air temperature Tr is high, in the step ST17, it is determined whether or not the short timer T5 has counted three minutes, or It is determined whether or not the long timer T6 has counted 7 minutes, and the determination is NO until the short timer T5 has counted 3 minutes or the long timer T6 has counted 7 minutes. Move and return. In other words, the compressor (1) performs a residual operation for 3 minutes or 7 minutes while keeping the minimum operation frequency step Nmin.

After performing the residual operation, the low load detecting means (11) continuously outputs the first low load signal for 7 minutes or the second low load signal for 3 minutes, and outputs the long timer T6 or the short timer. When the timer T5 expires, the determination in step ST17 becomes NO, and the process proceeds to step ST18 where the thermo-off unit (13) performs the processing of the frequency OFF circuit.
In ST19, the refrigerant circuit (9) is thermo-off (see FIG. 5C), and the process returns to the main routine.

In the above control flow, although not shown, if the state where the suction air temperature Tr is higher than the set temperature Ts by 4.5 ° C. for 30 seconds continues, the thermo-off means (13) puts the refrigerant circuit (9) into the thermo-off state. To In the above-described embodiment, the same control is performed during the cooling operation. When the suction air temperature Tr becomes lower by 1 ° C. than the set temperature Ts, the long timer T6 is set, and the suction air temperature Tr is set to the set temperature Ts. 2 for
When the temperature is lowered by ° C., the short timer T5 is operated.

Therefore, according to this embodiment, the smaller the temperature difference ΔTr between the suction air temperature Tr and the set temperature Ts, the longer the operation time until the thermo-off, so that the suction air temperature Tr becomes the set temperature. If the temperature is close to Ts, the residual operation can be performed for a long time (7 minutes). If the suction air temperature Tr is apart from the set temperature Ts, the residual operation can be performed for a short time (3 minutes). can do. As a result, the entire room can be air-conditioned to the set temperature Ts substantially uniformly, so that the adverse effects of the short circuit and the airflow distribution can be eliminated, so that the comfort can be improved.

In each of the embodiments, a separate type air conditioner has been described, but the present invention can be applied to various types of air conditioners. Further, in the invention according to claim 1, the low load detecting means (11)
May set three or more thermo-off temperatures and output three or more low load signals. At this time, the counting means (12) outputs three or more timers corresponding to the low load signal. Is provided.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of the present invention.

FIG. 2 is a refrigerant circuit diagram illustrating a refrigerant piping system of the air conditioner.

FIG. 3 is a control flow chart of thermo-off.

FIG. 4 is a characteristic diagram of suction air temperature.

FIG. 5 is a characteristic diagram of an operating frequency of a compressor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Compressor 3 Outdoor heat exchanger (heat source side heat exchanger) 5 Electric expansion valve (expansion mechanism) 6 Indoor heat exchanger (use side heat exchanger) 9 Refrigerant circuit 10 Controller 11 Low load detecting means 12 Counting means 13 Thermo-off Means T5 Short timer T6 Long timer Thr Indoor suction sensor (Temperature detecting means)

Claims (2)

    (57) [Claims]
  1. A refrigerant circuit in which a variable capacity compressor (1), a heat source side heat exchanger (3), an expansion mechanism (5), and a use side heat exchanger (6) are connected in order. 9) In the air-conditioning apparatus including: a temperature detecting means (Thr) for detecting an indoor temperature; and a plurality of thermo-off temperatures having different temperature differences with respect to a set temperature, wherein the temperature detecting means (Thr) When the detected indoor temperature reaches the respective thermo-off temperatures when the compressor (1) has the minimum capacity, the low-load detecting means (11) for outputting a low-load signal corresponding to each of the thermo-off temperatures, and the low-load detecting means The output time during which each low load signal of (11) is continuously output is counted, and the counting operation for the low load signal close to the set temperature is set long, and a time-up signal is output when the counting operation is completed. Counting means (12)
    When a time-up signal from the counting means (12) is received, a thermo-off means (13) for setting the refrigerant circuit (9) to a thermo-off state
    An operation control device for an air conditioner, comprising:
  2. 2. The operation control device for an air conditioner according to claim 1, wherein the low load detecting means includes a first thermo-off temperature having a small temperature difference with respect to a set temperature and a second thermo-off temperature having a large temperature difference. Is set, and the first
    The counting means (12) is configured to output a first low load signal based on the thermo-off temperature and a second low load signal based on the second thermo-off temperature. An air conditioner comprising: a long timer T6 for counting an output time of a load signal; and a short timer T5 for setting a short counting time and counting the output time of the second low load signal. Operation control device.
JP4169010A 1992-06-26 1992-06-26 Operation control device for air conditioner Expired - Fee Related JP2768148B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4169010A JP2768148B2 (en) 1992-06-26 1992-06-26 Operation control device for air conditioner

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4169010A JP2768148B2 (en) 1992-06-26 1992-06-26 Operation control device for air conditioner

Publications (2)

Publication Number Publication Date
JPH0611173A JPH0611173A (en) 1994-01-21
JP2768148B2 true JP2768148B2 (en) 1998-06-25

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
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Country Status (1)

Country Link
JP (1) JP2768148B2 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009041075A1 (en) 2007-09-28 2009-04-02 Daikin Industries, Ltd. Compressor operation control device and air conditioner using the same
JP6094561B2 (en) * 2014-10-31 2017-03-15 ダイキン工業株式会社 Air conditioner

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