KR100239541B1 - Heatig control apparatus and method for air conditioner - Google Patents

Abstract

The present invention relates to a heating control apparatus and a method of an air conditioner, comprising: an indoor heat exchanger for heat-exchanging air blown by an indoor fan, and an electric heater for raising an indoor discharge temperature of the air heat-exchanged in the indoor heat exchanger. An air conditioner comprising: an operation operation means for inputting a set temperature, an indoor temperature detection means for detecting an indoor temperature, an outdoor temperature detection means for detecting an outdoor temperature, a set temperature input by the operation operation means and the Control means for calculating the temperature difference between the indoor temperature detected by the indoor temperature sensing means, and controlling the driving of the electric heater according to the outdoor temperature detected by the outdoor temperature sensing means, and heating operation according to the control of the control means It consists of a heater driving means for driving the electric heater to perform, calculates the temperature difference between the set temperature and the room temperature, To sense the temperature, so controlling the operation of the electric heater to improve comfort, reduce power consumption and frequent compressor on / off.

Description

Heating controller and method of air conditioner

The present invention relates to an air conditioner equipped with an auxiliary electric heater, and more particularly, to a heating control device and a method of an air conditioner for efficiently controlling the operation of an electric heater according to an indoor temperature and an outdoor temperature during a heating operation.

In the conventional air conditioner, as shown in FIG. 1, a suction grill member 5 having a plurality of suction ports 3 through which indoor air is sucked is installed at the front lower part of an indoor main body 1 (hereinafter, referred to as a main body). In addition, a discharge port 7 is formed on the front surface of the main body 1 to discharge the air sucked through the suction port 3 and heat-exchanged with cold or warm air to the room.

In addition, the discharge port 7 is provided with a vertical wind vane 9 for adjusting the direction of the air discharged into the room through the discharge port 7 up and down and the left and right wind vane 11 for adjusting the left and right, the main body On the front surface of (1), the cover member 13 is fixed to the interior of the indoor unit and protects the interior. At the lower side of the cover member 13, the operation mode of the air conditioner (automatic, cooling) , Dehumidification, blowing, heating, etc.) and a start / stop of operation, and an operation unit 15 for adjusting the air volume and the air direction of the air discharged through the discharge port 7.

As shown in FIG. 2, a filter member 17 is installed inside the suction grill member 5 to filter foreign substances such as dust floating in the indoor air sucked through the suction port 3. Inside the filter member 17, a straight indoor heat exchanger 19 is installed to heat-exchange the indoor air filtered by the filter member 17 to cold or warm air by latent heat of evaporation of the refrigerant.

In addition, the upper part of the indoor heat exchanger 19 sucks indoor air through the suction port 3 and simultaneously discharges air heat-exchanged in the indoor heat exchanger 19 to the room through the discharge port 7. A blower fan 23 (hereinafter, referred to as an indoor fan) that rotates as the fan motor 21 is driven is installed, and the suction port is provided at the same time as the indoor fan 23 is covered with an outer side of the indoor fan 23. The duct member 25 which guides the flow of the air which is sucked in through (3) and discharged to the said discharge port 7 is provided.

In addition, an upper portion of the indoor fan 23 is provided with an electric heater 27 for raising the temperature of the air discharged through the discharge port 7 during the heating operation when the outdoor temperature is low.

When the air conditioner configured as described above is an inverter air conditioner that also serves as both heating and cooling, the four-way valve 31 is turned on during heating so that the refrigerant is shown in the dotted line in FIG. → indoor heat exchanger (19) → expansion valve (35) → heating expansion valve (37) → outdoor heat exchanger (39) → four-way valve (31) → compressor (33).

On the other hand, during cooling, the four-way valve 31 is turned off, so that the refrigerant is shown by the solid line in FIG. 3, and the compressor 33 → four-way valve 31 → outdoor heat exchanger 39 → one-way valve 38 → expansion. The valve (35) → the indoor heat exchanger (19) → the four-way valve (31) → the compressor (33).

At this time, the four-way valve 31 adjusts the flow path so that the refrigerant circulates in a solid line when off, and adjusts the flow path so that the refrigerant circulates in a dotted line when on.

In the air conditioner for both cooling and heating configured as described above, when the user operates the remote controller or the control unit 15 to select a desired operation mode (for example, cooling) and turns on the operation key, the indoor fan motor 21 is driven. As the indoor fan 23 rotates, the indoor air is sucked into the main body 1 through the suction port 3.

The set temperature Ts when the set temperature Ts is lower than the room temperature Tr by comparing the temperature Tr of the indoor air sucked through the suction port 3 with the set temperature Ts. ) And the operating frequency of the compressor 33 is determined according to the difference between the room temperature Tr and the compressor 33.

When the compressor 33 is driven, as the refrigerant is shown by the solid line in FIG. 3, the compressor 33 → the four-way valve 31 → the outdoor heat exchanger 39 → the one-way valve 38 → the expansion valve 35. → the indoor heat exchanger (19) → the four-way valve (31) → the compressor (33) is circulated in order to begin to cool the indoor heat exchanger (19).

Therefore, the indoor air sucked into the main body 1 through the suction port 3 passes through the indoor heat exchanger 19, and is heat-exchanged with cold air by the latent evaporation of the refrigerant flowing in the indoor heat exchanger 19, The cold air heat exchanged in 19 is guided to the upper part and discharged into the room through the discharge hole 7, and the cold air discharged through the discharge hole 7 is inclined to the wind direction angle of the upper and lower wind vanes 9 and the left and right wind vanes 11. As the wind direction is adjusted up and down or left and right according to the indoor cooling.

On the other hand, during heating, the heating cycle and the electric heater 27 are simultaneously operated only when the set temperature Ts is higher than the room temperature Tr by comparing the set temperature Ts with the room temperature Tr. If the set temperature Ts is higher than the room temperature Tr, only the heating cycle is operated.

That is, when the difference between the set temperature Ts and the room temperature Tr is less than 4 ° C., only the compressor 33 is driven, and if it is 4 ° C. or more, the compressor 33 and the electric heater 27 are driven.

When the compressor 33 is driven, the refrigerant is shown by the dotted line in Fig. 3, the compressor 33 → four-way valve 31 → indoor heat exchanger 19 → expansion valve 35 → heating expansion valve 37 ) → the outdoor heat exchanger (39) → four-way valve (31) → the compressor (33) in order to circulate in the room heat exchanger (19) starts to heat, at this time depending on the temperature of the indoor heat exchanger (19) changes The drive of the fan 23 is controlled.

If the temperature of the indoor heat exchanger 19 is lower than a predetermined temperature (about 32 ° C.), the indoor fan 23 is stopped to prevent cold air from being discharged to the room during the initial heating. If the temperature is above a predetermined temperature (about 32 ° C.), the indoor fan 23 is driven.

When the indoor fan 23 is driven, the indoor air sucked into the main body 1 through the suction port 3 passes through the indoor heat exchanger 19 while the warm air is caused by the latent heat of evaporation of the refrigerant flowing in the indoor heat exchanger 19. Heat exchanged by the heat exchanger, and the warm air heat-exchanged in the indoor heat exchanger 19 is guided to the upper portion and discharged into the room through the discharge hole 7, and the warm air discharged through the discharge hole 7 is the up-down wind vane 9 and the left-right wind direction Air conditioning is performed up and down or left and right according to the wind direction angle of the wing 11 to perform the indoor heating.

On the other hand, if the electric heater 27 is driven to the difference between the set temperature (Ts) and the room temperature (Tr) 4 ℃ or more, since the warm air heat exchanged in the indoor heat exchanger 19 is heated while passing through the electric heater 27 The temperature of the air discharged through the discharge port 7 rises to a temperature sufficient for heating. At this time, when the room temperature Tr becomes 1 ° C or more higher than the set temperature Ts, both the heating cycle and the electric heater 27 are stopped. And return to heating standby.

By the way, in the conventional heating and cooling air conditioner, the electric heater 27 is mounted so that the discharge temperature of the air discharged through the discharge port 7 during heating operation when the outdoor temperature is low rises to a temperature sufficient for heating. If the outdoor temperature is higher than the predetermined temperature, the electric heater 27 is operated unnecessarily even though only the heating cycle can produce a sufficient discharge temperature, causing frequent compressor 33 on / off due to waste of power and excessive discharge temperature. There was a problem with breaking.

Therefore, the present invention has been made to solve the above-mentioned problems, and calculates the temperature difference between the set temperature and the room temperature, and detects the outdoor temperature to control the operation of the electric heater to reduce power and frequent compressor on / off. It is an object of the present invention to provide a heating control device and a method of an air conditioner, thereby improving comfort.

In order to achieve the above object, a heating control apparatus of an air conditioner according to the present invention includes an indoor heat exchanger for heat-exchanging air blown by an indoor fan, and an electric heater for raising an indoor discharge temperature of air heat-exchanged in the indoor heat exchanger. An air conditioner comprising: an operating operation means for inputting a set temperature, an indoor temperature sensing means for sensing an indoor temperature, an outdoor temperature sensing means for sensing an outdoor temperature, a set temperature input by the operating operation means, and Control means for calculating a temperature difference between the indoor temperatures detected by the indoor temperature sensing means, and controlling driving of the electric heater according to the outdoor temperature detected by the outdoor temperature sensing means, and heating according to the control of the control means Characterized in that the heater driving means for driving the electric heater to perform the operation.

In addition, the heating control method of the air conditioner according to the present invention comprises a first temperature discrimination step of determining whether the temperature difference between the set temperature and the room temperature is more than the first predetermined temperature, and the temperature difference is first predetermined in the first temperature discrimination step. If the temperature is higher than the second temperature determination step of determining whether the outdoor temperature is less than the second predetermined temperature, and if the outdoor temperature is less than the second predetermined temperature in the second temperature determination step, the heating cycle and the electric heater are operated at the same time for heating. In the first heating step and the second temperature discriminating step, when the outdoor temperature is greater than or equal to the second predetermined temperature, the second heating step is performed by heating only the heating cycle.

1 is a perspective view showing an indoor unit of a conventional air conditioner,

2 is a longitudinal sectional view showing an indoor unit of a conventional air conditioner;

3 is a cooling / heating cycle diagram of a conventional air conditioner,

4 is a control block diagram of a heating control device of an air conditioner according to an embodiment of the present invention;

5a and 5b is a flow chart showing the operation sequence of the heating control of the air conditioner according to the present invention.

<Explanation of symbols for main parts of the drawings>

3: inlet port 7: outlet port

23: indoor fan 27: electric heater

104: control means 106: room temperature detection means

108: indoor piping temperature sensing means 110: outdoor temperature sensing means

120: heater driving means 122: compressor driving means

124: outdoor fan motor driving means 126: indoor fan motor driving means

128: four-way valve driving means 130: display means

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

About the same part as a conventional structure, the description which overlaps by specifying the same name and the same code | symbol is abbreviate | omitted.

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. Is the operation mode of the air conditioner (automatic, cooling, dehumidification, blowing, heating, etc.) and the air volume (strong wind, weak wind, breeze, etc.) and the air direction, set temperature (Ts), air of the air discharged through the discharge port (7) By inputting the operation / stop of the conditioner, the operation operation means 102 is an infrared ray transmitted from a remote control unit in accordance with a key operation of an operation unit 15 provided on the control panel of the main body 1 and a remote controller (not shown). The remote control signal receiver 103 is configured to receive a signal.

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 that controls the overall operation of the machine, the control means 104 calculates a temperature difference between the set temperature Ts and the room temperature Tr, and controls the operation of the electric heater 27 according to the outdoor temperature To. To control.

The indoor temperature detecting means 106 is sucked through the inlet port 3 to control the indoor temperature to the temperature Ts set by the user by the driving operation means 102 to perform the heating operation of the air conditioner. The temperature Tr of the indoor air is sensed, and the indoor pipe temperature detecting means 108 controls the pipe temperature of the indoor heat exchanger 19 that changes during the heating operation of the air conditioner, that is, the indoor heat exchanger 19. Sensing the refrigerant temperature passing through, the outdoor temperature detecting means 110 detects the temperature (To) of the outdoor air that changes during the heating operation of the air conditioner and outputs it to the control means (104).

In addition, the heater driving means 120 is a control output from the control means 104 to increase the indoor discharge temperature of the air discharged through the discharge port 7 in accordance with the room temperature (Tr) and the outdoor temperature (To) The electric heater 27 is driven and controlled by the signal, and the compressor driving means 122 is sensed by the temperature Ts set by the user by the driving operation means 102 and the room temperature sensing means 106. Drive control of the compressor 33 receives the control signal output from the control means 104 in accordance with the difference of the room temperature (Tr).

The outdoor fan motor driving means 124 is controlled according to the difference between the temperature Ts set by the user by the driving operation means 102 and the room temperature Tr sensed by the indoor temperature sensing means 106. Receiving a control signal output from the means 104 to drive the outdoor fan by controlling the rotation speed of the outdoor fan motor 125 to blow the air heat-exchanged in the outdoor heat exchanger 39 to the outside, and drive the indoor fan motor The means 126 receives the control signal output from the control means 104 according to the air volume set by the user by the operation operation means 102 (air or cold air heat exchanged in the indoor heat exchanger 19). It drives the indoor fan 23 by controlling the rotation speed of the indoor fan motor 21 to blow the air into the room.

Four-way valve driving means 128 receives the control signal output from the control means 104 to convert the flow of the refrigerant in accordance with the operating conditions (cooling or heating) input by the operation operation means 102 four-way valve The driving means 31 is controlled to be turned on / off, and the display means 130 controls the operation selection mode (automatic, cooling, dehumidification, air blowing, etc.) input by the driving operation means 102 under the control of the control means 104. Display the temperature and time).

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

5A and 5B are flowcharts showing the operation sequence of the heating control of the air conditioner according to the present invention, in which S denotes a step (STEP) in FIGS. 5A and 5B.

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, the user operates the operation operation means 102 to input a desired operation mode (for example, heating), a set temperature (Ts), and a set air volume of the air conditioner, and then presses the operation key. From the 102, an operation selection signal and an operation start signal (hereinafter referred to as operation 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 an operation signal is input (YES), the control means 104 determines whether the operation condition input by the operation operation means 102 is a heating operation, in step S3. If it is not the heating operation (NO), the process proceeds to step S31, returns to the step S3 while performing the cooling or dehumidifying operation of the air conditioner, and repeats the operation of step S3 or less.

As a result of the discrimination in step S3, in the case of heating operation (YES), the control means 104 proceeds to step S4 to perform the heating operation of the air conditioner, and the control means 104 detects the indoor temperature detected by the room temperature sensing means 106. The analog data of the temperature Tr is input and converted into digital to calculate the temperature difference between the set temperature Ts and the room temperature Tr, and then the temperature difference between the set temperature Ts and the room temperature Tr is the predetermined temperature T1; Approx. 4 ° C) or higher.

As a result of the determination in step S4, when the temperature difference between the set temperature Ts and the room temperature Tr is equal to or higher than the predetermined temperature T1 (YES), the control means 104 proceeds to step S5. It receives the analog data of the outdoor temperature (To) sensed by 110 and converts it to digital to determine whether the outdoor temperature (To) is less than a predetermined temperature (T2; about 10 ℃).

As a result of the discrimination in step S5, when the outdoor temperature To is less than the predetermined temperature T2 (YES), the flow advances to step S6, and the control means 104 determines the difference between the room temperature Tr and the set temperature Ts. The operating frequency of the compressor 33 and the rotation speed of the outdoor fan motor 125 are determined according to the control signal for driving the compressor 33 and the outdoor fan. The compressor driving means 122 and the outdoor fan motor driving means 124. At the same time, the control signal for driving the electric heater 27 and the four-way valve 31 is output to the heater driving means 120 and the four-way valve driving means 128.

Therefore, the compressor driving means 122 drives the compressor 33 according to the operating frequency determined by the control means 104, and in the outdoor fan motor driving means 124 according to the rotation speed determined by the control means 104, In the four-way valve drive means 128, the four-way valve 31 is turned on under the control of the control means 104, so that the refrigerant flows from the compressor 33 to the four-way valve 31 to the indoor heat exchanger 19. Expansion valve (35) → heating expansion valve (37) → outdoor heat exchanger (39) → four-way valve (31) → compressor (33) in order to circulate in order to start heating the indoor heat exchanger (19).

Then, the heater driving means 120 drives the electric heater 27 by supplying a power supply voltage applied to the electric heater 27 under the control of the control means 104, and proceeds to step S7, the control means 104 is Pre-heating piping to prevent the cold air discharge at the initial temperature (T3) by converting the indoor piping temperature (Tip) to a predetermined temperature by receiving the analog data of the indoor piping temperature (Tip) sensed by the indoor piping temperature detection means 108 Temperature, about 32 ° C) or higher.

As a result of the determination in step S7, when the indoor piping temperature Tip is less than the predetermined temperature T3 (NO), it is determined that it is a temperature condition in which cold air can be discharged to the room, Repeat the operation.

On the other hand, when the determination result in step S7 indicates that the indoor piping temperature Tip is higher than or equal to the predetermined temperature T3 (YES), it is determined that the temperature condition is such that no cold air is discharged to the room, and the control means 104 is executed. ) Outputs a control signal for driving the indoor fan 23 to the indoor fan motor driving means 126.

Therefore, the indoor fan motor driving means 126 drives the indoor fan 23 by controlling the rotation speed of the indoor fan motor 21 according to the set air volume.

When the indoor fan 23 is driven, the refrigerant compressed by the compressor 33 into the gas of high temperature and high pressure flows into the indoor heat exchanger 19 through the four-way valve 31 and the indoor heat exchanger 19 in step S9. ) Heat exchanges the gas refrigerant compressed to high temperature and high pressure with air blown by the indoor fan 23 and cools the refrigerant to room temperature and high pressure refrigerant. Heats through the warm air while passing.

The air heat-exchanged with the warm air in the indoor heat exchanger 19 is moved upward and downward or left and right depending on the wind direction angles of the upper and lower wind vanes 9 and the left and right wind vanes 11 rotatably installed at the discharge port 7. Heat the room while adjusting.

At this time, if the temperature difference between the set temperature (Ts) and the indoor temperature (Tr) is 4 ℃ or more, and the outdoor heater (To) is driven below the predetermined temperature (T2), the indoor heat exchanger (19) Since the warm air heat exchanged in the heat is heated while passing through the electric heater 27, the temperature of the air discharged through the discharge port 7 rises to a temperature sufficient for heating.

In addition, the low temperature and high pressure liquid refrigerant liquefied in the indoor heat exchanger (19) passes through an expansion valve (35) and a heating expansion valve (37) to expand to the evaporation pressure, and is decompressed to a low temperature low pressure free refrigerant to reduce the temperature of the outdoor heat exchanger ( 39).

Therefore, the outdoor heat exchanger (39) receives the low-temperature low-pressure free refrigerant decompressed by the expansion valve (35) and the heating expansion valve (37), and heats and cools the air blown by the outdoor fan by heat of latent evaporation of the refrigerant. The low temperature low pressure gas refrigerant cooled by the outdoor heat exchanger (39) is sucked back into the compressor (33) through the four-way valve (31), and as shown by the dotted line in FIG. Perform indoor heating.

As described above, when the heating operation is performed for a predetermined time, the room temperature Tr gradually rises, and therefore, the process proceeds to step S10, where the room temperature detecting means 106 detects the changing room temperature Tr at this time, and the control means 104. ) Calculates the temperature difference between the room temperature Tr and the set temperature Ts detected by the room temperature sensing means 106, and then the temperature difference between the room temperature Tr and the set temperature Ts is a predetermined temperature T4; , 1 ° C) or higher.

As a result of the discrimination in step S10, when the temperature difference between the room temperature Tr and the set temperature Ts is less than the predetermined temperature T4 (NO), the process returns to the step S9 and continues the heating operation while the step S9 is continued. If the temperature difference between the room temperature Tr and the set temperature Ts is equal to or higher than the predetermined temperature T4 (YES), the control means 104 returns to the compressor 33, The outdoor fan, the four-way valve 31, the indoor fan 23, and the electric heater 27 are all turned off, and the heating operation is stopped to return to the step S4 to return to the heating standby state in which the operation of the step S4 or less is repeatedly performed. .

On the other hand, when the determination result in step S4 indicates that the temperature difference between the set temperature Ts and the room temperature Tr is less than the predetermined temperature T1 (when NO), the control means 104 proceeds to step S41. It is determined whether Ts) is greater than or equal to the room temperature Tr. When the set temperature Ts is less than or equal to the room temperature Tr (NO), the flow returns to step S4 to repeat the operation of step S4 or less.

As a result of the discrimination in step S41, when the set temperature Ts is equal to or higher than the room temperature Tr (YES), the flow advances to step S42, and the control means 104 determines the difference between the room temperature Tr and the set temperature Ts. The operating frequency of the compressor 33 and the rotation speed of the outdoor fan motor 125 are determined according to the control signal for driving the compressor 33 and the outdoor fan. The compressor driving means 122 and the outdoor fan motor driving means 124. ) And a control signal for controlling the four-way valve 31 to the four-way valve driving means (128).

Therefore, the compressor driving means 122 drives the compressor 33 according to the operating frequency determined by the control means 104, and in the outdoor fan motor driving means 124 according to the rotation speed determined by the control means 104, In the four-way valve drive means 128, the four-way valve 31 is turned on under the control of the control means 104, so that the refrigerant flows from the compressor 33 to the four-way valve 31 to the indoor heat exchanger 19. Since the expansion valve 35 → the heating expansion valve 37 → the outdoor heat exchanger 39 → the four-way valve 31 → the compressor 33 is circulated, the indoor heat exchanger 19 starts to heat, and the flow proceeds to step S7. The operation of step S7 or less is repeated.

According to the heating control apparatus and method of the air conditioner according to the present invention as described above, by calculating the temperature difference between the set temperature and the room temperature, and by sensing the outdoor temperature to control the operation of the electric heater, power saving and frequent There is an effect of improving the comfort by reducing the compressor on / off.

Claims (3)

An air conditioner having an indoor heat exchanger for heat-exchanging air blown by an indoor fan, and an electric heater for heating the air heat-exchanged in the indoor heat exchanger to increase the indoor discharge temperature, the air conditioner controlling the heating of the air conditioner. The apparatus includes an operation operation means for inputting a set temperature, an indoor temperature sensing means for sensing an indoor temperature, an indoor piping temperature sensing means for sensing a temperature of the indoor heat exchanger which changes during heating operation according to the operation of a compressor; A control signal for calculating a temperature difference between a set temperature input by the driving operation means and an indoor temperature detected by the indoor temperature sensing means, and driving the electric heater according to the outdoor temperature detected by the outdoor temperature sensing means Control means for outputting a heater drive means for driving an electric heater in accordance with a control signal from the control means; The control means outputs a control signal for simultaneously operating the electric heater and the heating cycle when the temperature difference between the set temperature and the indoor temperature is equal to or greater than the heater driving temperature and the outdoor temperature is less than the hot air discharge temperature. Heating control device of air conditioner. An air conditioner having an indoor heat exchanger for heat-exchanging air blown by an indoor fan, and an electric heater for heating the air heat-exchanged in the indoor heat exchanger to increase the indoor discharge temperature, the air conditioner controlling the heating of the air conditioner. The apparatus includes an operation operation means for inputting a set temperature, an indoor temperature sensing means for sensing an indoor temperature, an indoor piping temperature sensing means for sensing a temperature of the indoor heat exchanger which changes during heating operation according to the operation of a compressor; A control signal for calculating a temperature difference between a set temperature input by the driving operation means and an indoor temperature detected by the indoor temperature sensing means, and driving the electric heater according to the outdoor temperature detected by the outdoor temperature sensing means Control means for outputting a heater drive means for driving an electric heater in accordance with a control signal from the control means; And the control means outputs a control signal for operating only the heating cycle when the temperature difference between the set temperature and the indoor temperature is equal to or higher than the heater driving temperature but the outdoor temperature is higher than the hot air discharge temperature. Device. Heater drive temperature discrimination step for determining whether the temperature difference between the set temperature and the room temperature is higher than the heater drive temperature, and if the temperature difference is higher than the heater drive temperature in the heater drive temperature discrimination step, the hot air discharge to determine whether the outdoor temperature is below the warm air discharge temperature In the temperature discrimination step and the hot air discharge temperature determination step, when the outdoor temperature is less than the hot air discharge temperature, the first heating step for heating by operating the heating cycle and the electric heater at the same time, and the outdoor air temperature during the hot air discharge temperature determination step The heating control method of the air conditioner comprising a second heating step of heating by operating only the heating cycle if the temperature is higher.

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