KR100286552B1 - Controlling Apparatus and Method For Power-Saving Operation Of Air Conditioner - Google Patents

Abstract

The present invention relates to a power saving operation control device and a method of an air conditioner, and performs a cooling operation by circulating a refrigerant in the order of a compressor, an outdoor heat exchanger, a main capillary tube, and an indoor heat exchanger, and performs heat exchange in the outdoor heat exchanger. An air conditioner having an outdoor fan for circulating outdoor air so as to circulate the air, wherein the auxiliary capillary tube expands the refrigerant condensed in the outdoor heat exchanger together with the main capillary tube, and the refrigerant condensed in the outdoor heat exchanger flows into the auxiliary capillary tube. A solenoid valve for opening / closing and controlling the refrigerant flow, an operation operation means for inputting a set temperature and a power saving operation signal, an indoor temperature sensing means for sensing an indoor temperature, and a power saving operation signal input from the operation operation means. By comparing the room temperature detected by the sensing means and the set temperature input by the operation operation means Control means for controlling the solenoid valve on / off and at the same time control the compressor and the outdoor fan in two stages, if the indoor temperature is less than the set temperature, the compressor and the outdoor fan to operate low and at the same time the inlet side of the auxiliary capillary By opening the refrigerant to flow through the main capillary and the auxiliary capillary tube to reduce the interruption of the outdoor unit increases the power saving effect.

Description

Control device for power saving operation of air conditioner and its method {Controlling Apparatus and Method For Power-Saving Operation Of Air Conditioner}

The present invention relates to an air conditioner, and in particular, by comparing the indoor temperature and the set temperature, controlling the compressor and the outdoor fan in two stages, and controlling the length of the capillary tube in two stages to control the power saving operation of the air conditioner. And to a method thereof.

In general, air conditioners are classified into various types according to their function or configuration of the unit. In terms of function, air conditioners can be classified into cooling only, cooling and dehumidification only, and cooling and heating. It is divided into an integrated type that is installed in a window and the like and a separate type that separates and installs a cooling device on the indoor side and a heat dissipation and compression device on the outdoor side.

The separate type air conditioner includes a multi type for air conditioning a plurality of indoor spaces by connecting two or more indoor units to one outdoor unit.

In the conventional separate type air conditioner, as shown in FIG. 1, the indoor unit 10 installed indoors and the outdoor unit 20 installed outdoors operate as one system, and heating and cooling operations as necessary. Can be.

The outdoor unit 20 includes a compressor 30 for compressing a refrigerant into a gaseous state of high temperature and high pressure, and a gas refrigerant compressed at high temperature and high pressure in the compressor 30 by heat exchanged with air blown by the outdoor fan 41 to form a low temperature. An outdoor heat exchanger (40) for cooling and condensing with a high pressure liquid refrigerant, and a capillary tube (50) for decompressively expanding the low temperature and high pressure liquid refrigerant cooled and condensed in the outdoor heat exchanger (40) with a low temperature and low pressure free refrigerant which is easy to evaporate. The indoor unit 10 converts the low-temperature low-pressure free refrigerant having passed through the capillary tube 50 into a completely low-temperature, low-pressure full-gas refrigerant while evaporating by heat exchange with air blown by the indoor fan 61. An indoor heat exchanger (60) is installed.

In the air conditioner configured as described above, a user operates a key operation unit provided on a control panel of a remote controller or indoor unit 10 (not shown) and presses an operation / stop key (hereinafter referred to as an operation key), and then selects a desired operation mode ( For example, when the cooling) and the set temperature (Ts) and the set air volume are input, the indoor unit 10 starts to operate. First, the indoor fan 61 is rotated according to the set air volume so that the indoor air enters the indoor unit 10. Begins to inhale.

At this time, when the temperature of the indoor air sucked into the indoor unit 10 is detected by a temperature sensor (not shown) in the indoor unit 10, the indoor unit 10 compares the set temperature Ts with the room temperature Tr to determine the room temperature ( When Tr is higher than the set temperature Ts, as shown in Fig. 2, the compressor 30 and the outdoor fan 41 are turned on.

When the compressor 30 is turned on, a refrigerant cycle is made in the solid arrow direction of FIG. 1. When the high temperature and high pressure gas refrigerant discharged from the compressor 30 of the outdoor unit 20 flows into the outdoor heat exchanger 40, In the outdoor heat exchanger (40), the gas refrigerant compressed at high temperature and high pressure is condensed by forced cooling by heat exchange with air blown by the outdoor fan (41), and the low temperature and high pressure liquid refrigerant condensed in the outdoor heat exchanger (40). Is introduced into the capillary 50.

The low temperature and high pressure liquid refrigerant introduced into the capillary tube 50 is expanded into a low temperature low pressure free refrigerant which is easy to evaporate, and flows into the indoor heat exchanger 60 installed in the indoor unit 10, and the refrigerant in the indoor heat exchanger 60. Evaporates and evaporates to remove heat from the air blown by the indoor fan 61 to cool the indoor air, and then discharges the cooled air (cold air) to the room to perform a cooling operation. The indoor heat exchanger 60 The low-temperature low-temperature gas refrigerant is cooled into the compressor 30 again and converted into a high-temperature high-pressure refrigerant gas by the adiabatic compression action of the compressor 30 to repeat the refrigerant cycle described above.

When the cooling operation is performed for a predetermined time as described above, since the temperature of the indoor air is gradually lowered, when the room temperature Tr falls below the set temperature Ts by detecting the changing room temperature Tr at this time, it is shown in FIG. As shown in FIG. 2, when the compressor 30 and the outdoor fan 41 of the outdoor unit 20 are turned off and the room temperature Tr rises to the set temperature Ts + 0.5 ° C., the outdoor unit 20 is shown in FIG. 2. The compressor 30 and the outdoor fan 41 are turned on again to perform the cooling operation.

However, in the conventional air conditioner configured as described above, the indoor temperature Tr is controlled to 0.5 ° C based on the set temperature Ts so that the compressor 30 and the outdoor fan 41 of the outdoor unit 30 are frequently interrupted to operate. There is a problem that the efficiency is lowered, the instantaneous operating current suddenly rises when the compressor 30 is turned on / off and power consumption rises.

Accordingly, the present invention has been made in order to solve the above-mentioned conventional problems, and when the indoor temperature is above the set temperature, the compressor and the outdoor fan motor are operated at high and at the same time the inlet side of the auxiliary capillary tube is closed to cool the main capillary tube. It improves cooling ability by flowing through it, and if the indoor temperature is below the set temperature, operates the compressor and the outdoor fan motor low, and opens the inlet side of the auxiliary capillary tube so that the refrigerant flows through the main capillary tube and the auxiliary capillary tube. It is to provide a power saving operation control device and method of the air conditioner to increase the power saving effect by reducing the intermittent control.

In order to achieve the above object, the air conditioner operation control apparatus for an air conditioner according to the present invention performs a cooling operation by circulating a refrigerant in the order of a compressor, an outdoor heat exchanger, a main capillary tube, and an indoor heat exchanger, and heat exchange is performed in the outdoor heat exchanger. An air conditioner having an outdoor fan for circulating outdoor air, wherein the auxiliary capillary tube expands the refrigerant condensed in the outdoor heat exchanger together with the main capillary tube, and the refrigerant condensed in the outdoor heat exchanger is transferred to the auxiliary capillary tube. A solenoid valve for opening and closing the refrigerant flow to be introduced, an operation operation means for inputting a set temperature and a power saving operation signal, an indoor temperature sensing means for sensing an indoor temperature, and a power saving operation signal input from the operation operation means; The indoor temperature sensed by the temperature sensing means and the set temperature input by the operation operation means Compared to the on / off control of the solenoid valve and characterized in that the control means for controlling the compressor and the outdoor fan in two stages.

In addition, the power saving operation control method of the air conditioner according to the present invention performs the cooling operation by circulating the refrigerant in the order of the compressor, the outdoor heat exchanger, the main capillary tube and the indoor heat exchanger, the outdoor fan to perform heat exchange in the outdoor heat exchanger In the operation method of the air conditioner to circulate the outdoor air by the operation, the operation operation step of inputting the set temperature and power saving operation signal, the indoor temperature sensing step of detecting the indoor temperature, and the power saving operation signal from the operation operation step If it is input, the temperature discriminating step for comparing and discriminating the indoor temperature detected in the indoor temperature sensing step and the set temperature input in the operation operation step, and if the indoor temperature is above the set temperature in the temperature discriminating step, the compressor and the outdoor fan The solenoid valve is turned on so that the refrigerant condensed in the outdoor heat exchanger passes through the main When the room temperature is lower than the set temperature in the cooling operation step and the temperature discriminating step, the compressor and the outdoor fan are turned low, and the solenoid valve is turned off so that the refrigerant condensed in the outdoor heat exchanger It is characterized by consisting of a power saving operation step of performing a power saving operation by passing through a capillary tube.

1 is a refrigerant cycle diagram of a conventional air conditioner,

2 is a driving load state diagram according to a set temperature compared to a conventional room temperature;

3 is a refrigerant cycle diagram of an air conditioner according to the present invention;

4 is a control block diagram of an apparatus for controlling power saving operation of an air conditioner according to an embodiment of the present invention;

5 is a driving load state diagram according to the set temperature compared to the room temperature according to the present invention;

6a and 6b is a flow chart showing the operation procedure of the power saving operation control of the air conditioner according to the present invention,

<Explanation of symbols for main parts of drawing>

30: compressor 40: outdoor heat exchanger

41: outdoor fan 60: indoor heat exchanger

70: capillary capillary 80: auxiliary capillary capillary

90: solenoid valve 102: operation operation means

104: control means 108: compressor driving means

110: outdoor fan motor driving means 114: solenoid valve driving means

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

3 is a refrigerant cycle diagram of an air conditioner according to the present invention, in which the same parts as those in the conventional construction are denoted by the same reference numerals.

As shown in FIG. 3, in an air conditioner having an indoor unit 10 and an outdoor unit 20, the outdoor unit 20 includes a compressor 30 for compressing a refrigerant into a gaseous state of high temperature and high pressure, and the compressor ( The outdoor heat exchanger (40) for cooling and condensing the gas refrigerant compressed at high temperature and high pressure with air blown by the outdoor fan (41) to cool and condensing the liquid refrigerant with low temperature and high pressure (30), and cooling the outdoor heat exchanger (40). The main capillary tube 70 decompresses and expands the condensed low temperature high pressure liquid refrigerant into a free low temperature low pressure free refrigerant which is easy to evaporate, and the main capillary tube 70 is connected to both ends of the main capillary tube 70 during power saving operation. It is connected to one side of the auxiliary capillary tube 80 for decompressively expanding the low-temperature, high-pressure liquid refrigerant cooled and condensed by the outdoor heat exchanger 40 to a low-temperature low-pressure free refrigerant, and the outdoor heat exchanger during power saving operation. The refrigerant condensed at 40 is cooled. A solenoid valve 90 is installed to control the flow of the refrigerant to flow into the auxiliary capillary tube 80 to control the length of the capillary tube in two stages. The indoor unit 10 has a low temperature and low pressure passing through the capillary tube 50. An indoor heat exchanger (60) is provided, which converts the free refrigerant into air that is blown by the indoor fan (61) and converts it into a refrigerant gas in a completely gaseous state at low temperature and low pressure.

A circuit block diagram for controlling the power saving operation of the air conditioner configured as described above will be described with reference to FIG.

As shown in FIG. 4, the power supply means 100 converts a commercial AC voltage supplied from an AC power supply terminal (not shown) into a predetermined DC voltage required for the operation of the air conditioner, and outputs the same. Has a plurality of function keys for inputting the operation mode (automatic, cooling, dehumidification, blowing, heating, etc.) of the air conditioner, the set air volume, and the set temperature (Ts), as well as the operation / stop of the air conditioner. And a power saving operation key for inputting a power saving operation key and a power saving operation stop.

And, the control means 104 is applied to the DC voltage output from the power supply means 100 to initialize the air conditioner, as well as the air conditioning in accordance with the operation selection signal input by the operation operation means (102) As a microcomputer for controlling the overall operation of the machine, the control means 104 compares the indoor temperature (Tr) and the set temperature (Ts) during the power saving operation to two stages of the compressor (30) and the outdoor fan motor (111). At the same time as controlling the control of the solenoid valve 90 to open and close the flow of the refrigerant flowing into the auxiliary capillary tube (80).

The indoor temperature detecting means 106 is sucked into the indoor unit 10 to control the indoor temperature to the temperature Ts set by the user by the driving operation means 102 to perform cooling operation and power saving operation of the air conditioner. The temperature (Tr) of indoor air is detected

In addition, the compressor driving means 108 compares the temperature Ts set by the user by the driving operation means 102 and the room temperature Tr sensed by the room temperature sensing means 106 during the power saving operation. According to the control signal output from the control means 104 to control the compressor 30 in two stages (high or low), the outdoor fan motor driving means 110 to the operation operation means 102 during power saving operation The outdoor heat exchanger receives a control signal output from the control means 104 according to a comparison result of the temperature Ts set by the user and the indoor temperature Tr detected by the indoor temperature sensing means 106. The outdoor fan motor 111 is controlled in two stages (high or low) so as to blow the air heat-exchanged at 40) to the outside to drive the outdoor fan 41.

The indoor fan motor driving means 112 receives the control signal output from the control means 104 according to the air volume set by the user by the driving operation means 102 and the heat exchanged in the indoor heat exchanger 60 ( Drive the indoor fan 61 by controlling the rotation speed of the indoor fan motor to blow cold or warm air into the room.

In addition, in the drawing, the solenoid valve driving means 114 has a temperature Ts set by the user by the driving operation means 102 and the room temperature Tr sensed by the indoor temperature detecting means 106 during power saving operation. Drive control of the solenoid valve 90 by receiving the control signal output from the control means 104 to open and close the flow of the refrigerant flowing into the auxiliary capillary tube 80 to adjust the length of the capillary tube in two stages according to the comparison result. In addition, the display means 116 displays the operation selection mode (automatic, cooling, dehumidifying, blowing, heating, etc.) input by the driving operation means 102 under the control of the control means 104, The operation state of the air conditioner is displayed.

Hereinafter, the operation and effect of the power saving operation control device and method of the air conditioner configured as described above will be described.

6A and 6B are flowcharts showing the operation procedure of the power saving operation control of the air conditioner according to the present invention. In Figs. 6A and 6B, S denotes a step.

First, when power is applied to the air conditioner, the power supply means 100 converts a commercial AC voltage supplied from an AC power terminal (not shown) into a predetermined DC voltage required for driving the air conditioner, thereby driving each circuit and control means ( Output to 104).

Therefore, in step S1, the DC voltage output from the power supply means 100 is input from the control means 104 to initialize the air conditioner.

At this time, when the user operates the operation operation means 102 and presses the operation key, and inputs the operation mode (for example, cooling), the set temperature Ts, and the set air volume of the desired air conditioner, the operation operation means 102. ), An operation start signal (hereinafter referred to as an operation signal) and an operation selection signal are input to the control means 104.

Accordingly, in step S2, the control means 104 determines whether the driving signal is input from the driving operation means 102, and maintains the air conditioner in the operation standby state when the driving signal is not input (NO). The operation of step S2 and below is repeated.

As a result of the discrimination in step S2, when the operation signal is input (YES), the air conditioner compares the set temperature Ts with the room temperature Tr as shown in FIG. If the temperature Tr is higher than the set temperature Ts, the compressor 30 and the outdoor fan 41 are turned on. If the room temperature Tr is lower than the set temperature Ts, the compressor 30 and the outdoor fan 41 are turned off. When the indoor temperature Tr rises to the set temperature Ts + 0.5 ° C., the compressor 30 and the outdoor fan 41 are turned on again to perform a general cooling operation for performing indoor cooling.

In the normal cooling operation as described above, in step S4, the power saving operation key of the operation operation means 102 is turned on to determine whether the power saving operation signal is input from the operation operation means 102 to the control means 104, and then the power saving operation is performed. If no signal is input (NO), the flow returns to step S3 to repeat the operation of step S3 and below.

As a result of the discrimination in step S4, when the power saving operation signal is input (YES), the control means 104 drives the indoor fan motor to drive the control signal for driving (on) the indoor fan 61. Output to the means 112.

Therefore, the indoor fan motor driving means 112 receives the control signal output from the control means 104 in accordance with the set air volume to control the rotation speed of the indoor fan motor to drive the indoor fan 61.

When the indoor fan 61 is driven, the indoor air starts to be sucked into the indoor unit 10. At this time, the indoor temperature sensing means 106 detects the temperature Tr of the indoor air sucked into the indoor unit 10.

Accordingly, in step S6, the control means 104 receives the analog data of the room temperature Tr sensed by the room temperature sensing means 106 and converts it into digital, and then the room temperature Tr and the set temperature Ts. ) To determine if the room temperature (Tr) is greater than the set temperature (Ts).

As a result of the determination in step S6, if the room temperature Tr is not greater than the set temperature Ts (NO), the operation of step S6 or less is repeated while continuously detecting the room temperature Tr, and If the temperature Tr is greater than the set temperature Ts (YES), the controller 104 proceeds to step S7 and the control means 104 generates a control signal for operating the compressor 30 and the outdoor fan motor 111 high. Output to the driving means 108 and the outdoor fan motor driving means (110).

Therefore, the compressor driving means 108 receives the control signal output from the control means 104 and operates the compressor 30 in a high state, as shown in FIG. 5, and in the outdoor fan motor driving means 110. Receiving the control signal output from the control means 104, the outdoor fan 41 is operated in a high state, as shown in FIG.

Subsequently, when the control means 104 outputs a control signal for driving the solenoid valve 90 to the solenoid valve driving means 114 in step S8, the solenoid valve driving means 114 outputs from the control means 104. The solenoid valve 90 is turned on (closed) by receiving a control signal to close the inlet side of the auxiliary capillary tube 80 to block the flow of the refrigerant flowing into the auxiliary capillary tube 80.

Accordingly, when the high temperature and high pressure gas refrigerant discharged from the compressor 30 flows into the outdoor heat exchanger 40 in step S9, the outdoor heat exchanger 40 stores the gas refrigerant compressed to high temperature and high pressure in the outdoor fan 41. By heat exchanged by the air blown by the forced cooling to condense, the low-temperature, high-pressure liquid refrigerant condensed in the outdoor heat exchanger 40 is introduced into the main capillary tube (70).

The low temperature and high pressure liquid refrigerant introduced into the main capillary 70 is expanded into a low temperature low pressure free refrigerant which is easy to evaporate, and flows into the indoor heat exchanger 60 installed in the indoor unit 10. In the indoor heat exchanger 60, When the refrigerant evaporates and vaporizes, the heat is removed from the air blown by the indoor fan 61, and the indoor air is cooled. Then, the cooled air (cold air) is discharged to the room to perform a cooling operation, and the indoor heat exchanger ( The low-temperature low-temperature gas refrigerant cooled at 60) is introduced into the compressor 30 again and converted into a high-temperature high-pressure refrigerant gas by the adiabatic compression action of the compressor 30, and repeating the refrigerant cycle along the solid arrow direction of FIG. Since indoor cooling is performed, the cooling effect is increased.

When the cooling operation is performed for a predetermined time as described above, since the indoor temperature Tr gradually decreases, the changing indoor temperature Tr is sensed at this time, and in step S10, it is determined whether the indoor temperature Tr is below the set temperature Ts. When the room temperature Tr is not equal to or lower than the set temperature Ts (NO), the above cooling operation is performed while the above-described operation is performed repeatedly.

As a result of the determination in step S10, when the indoor temperature Tr is equal to or lower than the set temperature Ts (YES), the control means 104 moves the compressor 30 and the outdoor fan motor 111 low. The control signal for operating the output to the compressor driving means 108 and the outdoor fan motor driving means (110).

Therefore, the compressor driving means 108 receives the control signal output from the control means 104 and operates the compressor 30 in a low state as shown in FIG. 5, and in the outdoor fan motor driving means 110. In response to the control signal output from the control means 104, the outdoor fan 41 is operated in a low state as shown in FIG.

Subsequently, when the control means 104 outputs a control signal for driving the solenoid valve 90 to the solenoid valve driving means 114 in step S12, the solenoid valve driving means 114 outputs from the control means 104. The solenoid valve 90 is turned off (opened) in response to the control signal, and the inlet side of the auxiliary capillary tube 80 is opened to allow the refrigerant to flow into the auxiliary capillary tube 80, thereby increasing the length of the capillary tube.

Accordingly, when the high temperature and high pressure gas refrigerant discharged from the compressor 30 flows into the outdoor heat exchanger 40 in step S13, the outdoor heat exchanger 40 stores the gas refrigerant compressed to high temperature and high pressure in the outdoor fan 41. Heat-exchanged by air blown by the forced cooling to condense, and the low-temperature, high-pressure liquid refrigerant condensed in the outdoor heat exchanger 40 is introduced into the main capillary 70 and at the same time through the solenoid valve 90 through the auxiliary capillary tube (80) Inflow).

The low-temperature, high-pressure liquid refrigerant introduced into the main capillary tube 70 and the auxiliary capillary tube 80 is expanded into a low-temperature low-pressure free refrigerant which is easy to evaporate, and flows into the indoor heat exchanger 60 installed in the indoor unit 10, and the indoor In the heat exchanger (60), when the refrigerant evaporates and vaporizes, the heat is removed from the air blown by the indoor fan (61) to cool the indoor air, and then the cooled air (cold air) is discharged to the room to perform the cooling operation. The low-temperature, low-pressure gas refrigerant cooled by the indoor heat exchanger (60) is introduced into the compressor (30) again and converted into a refrigerant gas of high temperature and high pressure by the adiabatic compression action of the compressor (30) in the dotted arrow direction of FIG. As a result, the cooling cycle is performed repeatedly to cool the room, thereby realizing power saving operation.

At the time of power saving operation as described above, in step S14, the power saving operation key of the driving operation means 102 is turned off to determine whether the power saving operation off signal is input from the operation operation means 102 to the control means 104, and the power saving operation is performed. If no OFF signal is input (NO), the flow returns to step S6 to repeat the operation of step S6 and below.

As a result of the discrimination in step S14, when the power save operation off signal is input (YES), the flow advances to step S15, where the air conditioner returns to the normal operation mode before the power save operation and ends the operation.

According to the power saving operation control apparatus and method of the air conditioner according to the present invention as described above, when the indoor temperature is above the set temperature, the compressor and the outdoor fan motor are operated high and the inlet side of the auxiliary capillary tube is closed. The refrigerant flows through the main capillary to improve the cooling capacity. When the indoor temperature is below the set temperature, the compressor and the outdoor fan motor are operated low and the inlet side of the auxiliary capillary tube is opened to allow the refrigerant to flow through the main capillary tube and the auxiliary capillary tube. It is effective to increase the power saving effect by reducing the interruption of the outdoor unit to flow through.

Claims (4)

In an air conditioner having an outdoor fan for circulating the refrigerant to perform a cooling operation in the order of a compressor, an outdoor heat exchanger, a main capillary and an indoor heat exchanger, and circulates the outdoor air so that heat exchange is performed in the outdoor heat exchanger. An auxiliary capillary tube for expanding the refrigerant condensed in the outdoor heat exchanger together with the main capillary tube; Solenoid valve for opening and closing the refrigerant flow so that the refrigerant condensed in the outdoor heat exchanger flows into the auxiliary capillary; Operation operation means for inputting a set temperature and a power saving operation signal; Indoor temperature sensing means for detecting the indoor temperature, When the power saving operation signal is input from the operation operation means, the solenoid valve is controlled to be turned on or off based on the indoor temperature detected by the indoor temperature detection means and the set temperature input by the operation operation means. Power-saving operation control device of the air conditioner, characterized in that the control means for controlling the outdoor fan in two stages of low or high. The method of claim 1, The control means for controlling the power saving operation of the air conditioner, characterized in that for operating the compressor and the outdoor fan high if the room temperature detected by the room temperature sensing means is higher than the set temperature input by the operation operation means. . The method of claim 1, The control means for controlling the power saving operation of the air conditioner, characterized in that for operating the compressor and the outdoor fan low if the indoor temperature detected by the indoor temperature sensing means is less than the set temperature input by the operation operation means. . In a method of operating an air conditioner in which a refrigerant is circulated in the order of a compressor, an outdoor heat exchanger, a main capillary, and an indoor heat exchanger to perform cooling operation, and circulate outdoor air by an outdoor fan so that heat exchange is performed in the outdoor heat exchanger. , An operation operation step of inputting a set temperature and a power saving operation signal; An indoor temperature sensing step of detecting an indoor temperature; A temperature discriminating step of comparing and discriminating the indoor temperature detected in the indoor temperature sensing step and the set temperature input in the driving operation step when the power saving operation signal is input from the driving operation step; In the temperature discriminating step, if the indoor temperature is higher than the set temperature, the compressor and the outdoor fan are operated at a high temperature, and the solenoid valve is turned on to cool the condensed refrigerant in the outdoor heat exchanger to pass through the main capillary to perform a cooling operation. Wow, In the temperature discriminating step, when the indoor temperature is lower than the set temperature, the compressor and the outdoor fan are operated low, and the solenoid valve is turned off to allow the refrigerant condensed in the outdoor heat exchanger to pass through the main capillary and the auxiliary capillary to perform power saving operation. Power saving operation control method of the air conditioner, characterized in that consisting of a power saving operation step.