KR100244315B1 - Air conditioner controller and control method therefor - 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 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 a heating operation, and the Calculating a temperature difference between the set temperature input by the operation operation means and the room temperature detected by the room temperature sensing means, and counting the time at which the room pipe temperature detected by the indoor pipe temperature sensing means reaches a predetermined temperature Control means for controlling the driving of the electric heater and the electric heater to perform heating operation according to the control of the control means. It consists of a heater drive means for driving the temperature difference between the set temperature and the room temperature, and calculates the time the indoor piping temperature reaches a predetermined temperature to control the operation of the electric heater to reduce the power saving and frequent compressor on / off Improves comfort

Description

Heating controller and method of air conditioner

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner equipped with an auxiliary electric heater, and more particularly, to a heating control apparatus and a method of an air conditioner for efficiently controlling the operation of an electric heater according to an indoor temperature and an indoor piping 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 is also used for 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.

Accordingly, the present invention has been made in order to solve the above-mentioned problems, and calculates the temperature difference between the set temperature and the room temperature, and controls the operation of the electric heater by counting the time at which the indoor piping temperature reaches a predetermined temperature. It is an object of the present invention to provide a heating control apparatus and a method of an air conditioner that improves comfort by reducing savings and frequent compressor on / off.

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 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 a heating operation; Compute the temperature difference between the set temperature input by the driving operation means and the room temperature sensed by the room temperature sensing means, and count the time at which the indoor pipe temperature sensed by the indoor pipe temperature sensing means reaches a predetermined temperature. Control means for controlling the driving of the electric heater, and performing heating operation according to the control of the control means. It is characterized by being a heater driving means for driving an electric heater.

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. A cycle operation step of operating a heating cycle by driving a compressor, an outdoor fan, and a four-way valve if the temperature is higher, a time discrimination step of determining whether the driving time of the compressor has elapsed a predetermined time, and the indoor piping temperature is within the predetermined time. A second temperature discriminating step of determining whether or not a predetermined temperature has been reached; and a first heating for driving by heating the electric heater and the indoor fan if the indoor piping temperature does not reach the second predetermined temperature within a predetermined time in the second temperature discriminating step. A second heating step of heating only the indoor fan when the indoor piping temperature reaches a second predetermined temperature within a predetermined time in the heating step and the second temperature discriminating step; It characterized by comprising.

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 drawing>

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 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 for controlling 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 counts the time at which the indoor piping temperature Tip reaches a predetermined temperature. To control the operation of the electric heater 27.

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. Detects the passing refrigerant temperature and outputs it to the control means 104.

In addition, the heater driving means 120 is a control signal output from the control means 104 to increase the temperature of the air discharged through the discharge port 7 in accordance with the room temperature (Tr) and the indoor piping temperature (Tip) Drive the electric heater 27, and the compressor drive means 122 is a room (Ts) set by the user by the operation operation means 102 and the room sensed by the room temperature sensing means 106 The compressor 33 is drive-controlled by receiving a control signal output from the control means 104 in accordance with the difference in 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 discrimination in step S4, when the temperature difference between the set temperature Ts and the room temperature Tr is equal to or greater than the predetermined temperature T1 (YES), the control means 104 proceeds to step S5. And a driving signal of the compressor 33 to determine the operating frequency of the compressor 33 and the rotation speed of the outdoor fan motor 125 according to the difference between the set temperature Ts and the compressor driving means 122. And an 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. 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).

At this time, the control means 104 starts to count the drive time of the compressor 33 by the built-in timer in step S6, and in step S7 the drive time that has been countered has passed a predetermined time t2 (about 30 seconds). Determine whether or not.

As a result of the determination in step S7, when the predetermined time t2 has elapsed (YES), the indoor piping temperature Tip has not reached the predetermined temperature T3 within the predetermined time t2 (the outdoor temperature is Low level), the control means 104 transmits a control signal for driving the electric heater 27 and the indoor fan 23 to the heater driving means 120 and the indoor fan motor driving means 126. Output

Accordingly, the heater driving means 126 supplies the power voltage applied to the electric heater 27 under the control of the control means 104 to drive the electric heater 27, and in the indoor fan motor driving means 126. The indoor fan 23 is driven by controlling the rotation speed of the indoor fan motor 21 according to the set air volume.

On the other hand, when the determination result in step S7 indicates that the predetermined time t2 has not elapsed (NO), the control means 104 proceeds to step S8 and the indoor piping temperature sensed by the indoor piping temperature sensing means 108 is performed. The analog data of the temperature (Tip) is input and converted into digital to determine whether the indoor piping temperature (Tip) is above a predetermined temperature (T3; preheating piping temperature for preventing cold air discharge at the initial heating stage, about 32 ° C).

As a result of the determination in step S8, 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, and the air flow is awaited at step S6. The operation returns to the step S6 or less.

On the other hand, when the determination result in step S8 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 does not cause cold air to be discharged into the room, and the control means 104 proceeds. ) 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, in step S10, 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 ) 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, the difference between the set temperature (Ts) and the room temperature (Tr) is 4 ℃ or more, the indoor piping temperature (Tip) does not reach the predetermined temperature (T3) within a predetermined time (t2), the electric heater 27 is driven If so, 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.

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, so the flow proceeds to step S11, 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 determination in step S11, 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 S10 and continues the heating operation while the step S10 is continued. If the temperature difference between the room temperature Tr and the set temperature Ts is equal to or greater 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. 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).

At this time, in step S43, the control means 104 determines whether the indoor pipe temperature detected by the indoor pipe temperature detecting means 108 is greater than or equal to the predetermined temperature T3, and the indoor pipe temperature Tip is a predetermined temperature. If it is less than (T3) (NO), it is determined that it is a temperature condition in which cold air can be discharged into the room, and the flow returns to step S43 while waiting for the blowing operation to repeat the operation of step S43 or less.

As a result of the discrimination in step S43, when the indoor piping temperature Tip is equal to or higher than the predetermined temperature T3 (YES), it is determined that the temperature condition does not cause cold air to be discharged into the room, and the control means 104 proceeds to step S44. The control signal for driving the indoor fan 23 is output to the indoor fan motor driving means 126.

Therefore, the indoor fan motor driving means 126 controls the number of revolutions of the indoor fan motor 21 according to the set wind volume, and drives the indoor fan 23 to repeat the operation of step S10 or less. .

According to the heating control apparatus and method of the air conditioner according to the present invention as described above, the temperature difference between the set temperature and the room temperature is calculated, and the time for which the indoor piping temperature reaches a predetermined temperature is counted. Operation is controlled to reduce power and reduce frequent compressor on / off, improving comfort.

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; Compute the temperature difference between the set temperature input by the operation operation means and the room temperature sensed by the room temperature sensing means, and the indoor pipe temperature sensed by the indoor pipe temperature sensing means within a predetermined driving time of the compressor is cold wind. Control means for determining whether the prevention temperature has been reached and outputting a control signal, and a control signal from the control means According to the present invention, the control unit comprises a heater driving means for driving the electric heater. When the temperature does not reach the prevention temperature, the heating control device of the air conditioner, characterized in that the heating operation is performed by operating the electric heater with the indoor fan. 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; Compute the temperature difference between the set temperature input by the operation operation means and the room temperature sensed by the room temperature sensing means, and the indoor pipe temperature sensed by the indoor pipe temperature sensing means within a predetermined driving time of the compressor is cold wind. Control means for determining whether the prevention temperature has been reached and outputting a control signal, and a control signal from the control means According to the present invention, the control unit comprises a heater driving means for driving the electric heater. Heating control device for an air conditioner, characterized in that the heating operation is performed by operating only the indoor fan when the temperature is reached. A heater drive temperature discrimination step for determining whether the temperature difference between the set temperature and the room temperature is equal to or higher than the heater drive temperature; A cycle operation step of operating, a time discrimination step of determining whether the driving time of the compressor has passed a predetermined driving time for raising the temperature of an indoor heat exchanger, and the driving time of the compressor in the time discriminating step does not pass a predetermined driving time If not, the cold wind prevention temperature determination step for determining whether the indoor piping temperature has reached the cold wind prevention temperature, and if the indoor piping temperature does not reach the cold wind prevention temperature within a predetermined driving time in the cold wind prevention temperature determination step together with the electric heater and the indoor fan In the first heating step of the heating operation by driving, and the indoor ship in the cold wind prevention temperature discrimination step The second heating control method of the air conditioner, characterized in that step consisting of heating to the temperature is the predetermined drive time heating operation by driving only the indoor fan reaches a temperature in the cool air prevention.

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