JPH0518584A - Controlling method for air conditioner - Google Patents

Abstract

PURPOSE:To perform operating capacity of an air conditioner to a maximum limit at the time of turning ON an electric heater by incorporating two or more electric heaters in an indoor unit. CONSTITUTION:In a method for controlling an air conditioner containing two or more electric heaters in an indoor unit to turn ON, OFF the heaters as required, a total current sensor 3 for detecting a total operating current value of the conditioner, is provided. Preparation data (heater preparing bits) for turning ON the heater, data (heater bits) indicating ON/OFF state of the heater, and data (total current bits A, B) of the detected total operating current value, are transmitted from a controller 1 in the indoor unit, received by a controller 2 in an outdoor unit, and an operating frequency of a compressor is so controlled that the total current value becomes a predetermined value or less at least at the time of turning ON the heater and the total current value falls within a normal value range (a range in which the operating performance of the conditioner can be performed) after a predetermined time is elapsed from the time of turning ON the heater.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used in an inverter type air conditioner in which a plurality of electric heaters are built in an indoor unit, and when the electric heaters are in the ON state, the operation loss of the compressor is reduced and the operation capacity is reduced. The present invention relates to a control method for an air conditioner that maximizes the above.

[0002]

2. Description of the Related Art Conventionally, in this type of air conditioner, it takes time from power-on to obtaining hot air at a set temperature during heating operation, for example. For the purpose of compensating for the drawback, for example, the indoor unit has 2
Two electric heaters are built in, and these electric heaters are automatically turned on and off not only when the heating operation is started but also when necessary (for example, during defrosting).

If, for example, a PTC semiconductor heater (ceramic heater) having an excellent rising characteristic is used as the electric heater, the temperature of the warm air blown out at the start of the heating operation can be promptly increased particularly in the case of an air conditioner adopting an inverter system. It has the advantage that it can be raised.

[0004]

By the way, the above-mentioned PCT
The semiconductor heater has, for example, the current characteristics shown in FIG. 8, and its current value becomes maximum immediately after the power is turned on (immediately after it is turned on), and when two PCT semiconductor heaters are turned on, the current is doubled. become.

Therefore, in the above air conditioner control method, when the PCT semiconductor heater is turned on, the current limit value on the outdoor unit side is lowered by the maximum current value of the PCT semiconductor heater, that is, in the normal value range ( It is set lower than the range where the operating capacity of the air conditioner can be maximized.

However, during the ON state of the PCT semiconductor heater, the current limit value on the outdoor unit side is set lower than the normal value range, that is, by the maximum current value of the PCT semiconductor heater, the compressor is operated. Since the driving ability is suppressed, the operating ability of the air conditioner cannot be maximized, which may affect the maintenance of indoor comfort.

The present invention has been made in view of the above problems, and an object thereof is to keep the total operating current value within the range of the normal value when the electric heater is in the ON state to suppress the loss of the operating capacity of the compressor. An object of the present invention is to provide an air conditioner capable of maximizing the operating capacity of the machine.

[0008]

In order to achieve the above object, the present invention has a plurality of electric heaters incorporated in an indoor unit,
In the method for controlling an air conditioner of the inverter type, which controls the compressor of the outdoor unit to a target rotation speed while turning on and off the electric heaters as necessary, the above-mentioned air conditioning It has a total current sensor that detects the total operating current of the machine, and obtains the preparation data for turning on the electric heater in the indoor unit, the data of the on / off state of the electric heater, and the detected total The current value data, the preparation data, and the electric heater ON / OFF state data are transmitted to the outdoor unit, and the outdoor unit uses the data to perform the above-mentioned comprehensive operation during a predetermined time after the electric heater is turned ON. The rotational speed of the compressor is variably controlled so that the current value is kept below a predetermined value, and after the predetermined time has passed, the total current value is kept within the normal value range. The rotational speed of the compressor variable control to be summarized in that to the target rotational speed.

[0009]

With the above construction, when it is necessary to turn on one of the two electric heaters and turn on the other electric heater, for example, the control unit of the indoor unit outputs the operation total current. Value data (total current bit), preparation data (heater preparation bit), and electric heater on / off data (heater bit) are transmitted.

In the control unit of the outdoor unit, the operating frequency (rotational speed) of the compressor is lowered by the received data so that the total operating current value becomes equal to or less than a predetermined value before the electric heater is turned on. . As a result, even if the electric heater is turned on, the total operating current value does not exceed the maximum allowable current value.

Also, after a lapse of a predetermined time from turning on the electric heater, the other electric heater is turned on at the indoor unit side. That is, since the current consumption of one of the electric heaters is stabilized at a low value (shown in FIG. 8) after the elapse of the predetermined time, even if the other electric heater is turned on, the total operating current value is the maximum. This is because the allowable current value is never exceeded.

Furthermore, after a lapse of a predetermined time from turning on the other electric heater, the operating frequency of the compressor is increased so that the total operating current value is within the range of the normal value, that is, the operation of the air conditioner concerned. It is made possible to exert maximum capacity.

Therefore, when the electric heater is turned on, the total operating current value does not exceed the maximum permissible current value, and the current limit value of the outdoor unit is not set below the range of the normal value, that is, the total operating current. Since the operating frequency of the compressor is variable so that the current value is within the range of its normal value, the operating loss of the compressor can be eliminated and the operating capacity of the air conditioner is maximized. Can be made.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIGS. In FIG. 1, the inverter type air conditioner is of a split type that is divided into an indoor unit and an outdoor unit, and an indoor unit control unit 1 that controls the indoor unit.
And an outdoor unit controller 2 for controlling the outdoor unit.

On the indoor unit side, a total current sensor (for example, CT) 3 for detecting a total operating current value (hereinafter, referred to as total current value) I of the air conditioner, and, for example, turned on when the power is turned on or when necessary. The first and second electric heaters (including PCT semiconductor (ceramics) heaters, hereinafter referred to as heaters) 4,5 for warming the air blown into the room, and the first and second heaters 4,5. It is provided with first and second switches 6 and 7 for turning on and off.

It should be noted that, in the indoor unit controller 1, the first unit
And the second switches 6 and 7 are turned on and off, and power is supplied to the first and second heaters 4 and 5 through the switches.

The outdoor unit side is provided with a compressor 8 for supplying air having a set temperature to the room, and the outdoor unit control section 2 is provided.
The compressor 8 is controlled by an inverter, and the compressor 8
The operating frequency of is controlled variably.

Further, the necessary control signal (serial signal) is exchanged between the indoor unit control section 1 and the outdoor unit control section 2 as in the conventional case, and the indoor unit control section 1 receives the total current. Data of the total current value detected by the sensor 3 (2 bits, hereinafter referred to as total current bits A and B) and heater preparation data for turning on the first and second heaters 4 and 5 (1 bit (PH ), Hereinafter referred to as a preparation bit) and heater data (1 bit (HT), hereinafter referred to as a heater bit) indicating its on / off state, and the generated 4-bit data (serial signal) is controlled as above. It transmits to the outdoor unit control part 2 with a signal.

The contents of the total current bits A and B are shown in Table 1 below, for example.

[0020]

[Table 1] In addition, the outdoor unit control unit 2 that receives the 4-bit data
Then, according to Table 2 below, that is, the operating frequency of the compressor 8 (the number of rotations of the motor) is variably controlled according to the preparation bit, the heater bit, and the total current bits A and B, and the capacity of the air conditioner is maximized. It is possible to demonstrate.

[0021]

[Table 2] Next, a control method applied to the air conditioner having the above configuration will be described with reference to the time chart diagrams of FIGS. 2 to 7.
First, in the indoor unit control unit 1, it is necessary to turn on the first heater 4 and then turn on the second heater 5 due to the difference between the temperature detected by the indoor temperature sensor and the set temperature of the remote controller. It is assumed that it is determined that the two heaters are turned on. In this case, as shown in Table 2, the heater mode is sequentially changed to "a", "b", and "c". As already known, the indoor unit control unit 1 transmits the data of the target frequency of the compressor 8 to the outdoor unit control unit 2 according to the indoor temperature and the set temperature, as is already known.

At this time, as shown in FIG. 2, in the indoor unit control section 1, the heater mode "a", for example, the first heater 4 is used.
When the preparation bit for turning on is set to the “L” level (shown in (a) of the same figure) and the operating capacity of the air conditioner is maximized, that is, the total current sensor 3 detects the total. The current value I is within the normal value range, for example, 18 A or more,
Within the range of 19A or less, the total current bit A is "L".
At the level, the total current bit B is set to the “H” level (shown in Table 1).

Then, as shown in Table 2, the outdoor unit controller 2 which has received the above-mentioned preparatory bit / heater bit "H" and "L" levels changes the current operating frequency of the compressor 8 every 0.4 seconds. , For example, by 1 Hz (shown in (h) of the figure).

When the total current value I decreases to 18 A or less (shown in FIG. 9 (g)), the total current bit A,
Since B becomes "H" and "L", the operating frequency is continuously decreased by 1 Hz every 0.4 seconds in the outdoor unit control section 2, and the heater mode "a" in Table 2 causes The operating frequency of the compressor 8 is lowered until the total current value I drops to 12A.

When the total current value I reaches 12 A (shown in (g) of the figure), the total current bits A and B are "H" and "L".
Since the total current value I does not exceed the maximum allowable current value even when the heater is turned on, the first heater 4 is turned on by the indoor unit controller 1 (shown in FIG. "H" level), that is, the heater bit is set to "L" (shown in FIG. With these bits, the outdoor unit controller 2 controls the current operating frequency of the compressor 8 to be maintained as it is (shown in (h) of the figure).

When the first heater 4 is turned on, the air sucked in the indoor unit is warmed, and as shown in Table 2, the heater mode enters "b" (shown in Table 2), while the total current value is increased. I rises, but the preparation bit and heater bit remain "L" and "L", and the total current value I is 19A.
Unless the above, the total current bits A and B are "H" and "L".
(Or “H”, “H” or “L”, “H”), the operating frequency of the compressor 8 is maintained as it is (shown in FIG. 6 (h)), and the total current value I is maximum. I try not to exceed the allowable current value.

At this time, the total current value I rises by the current consumption of the first heater 4, but the current consumption of this heater is a low value after a certain period of time (for example, one minute) due to its characteristics. Even if the second heater 5 is turned on after the lapse of 1 minute, the total current value I does not exceed the maximum allowable current value. So the first
The second heater 5 is turned on when one minute has passed from the time when the heater 4 was turned on (shown in (f) of the same figure).

When the second heater 5 is turned on, that is, the two heaters are turned on, the wind sucked in the indoor unit is further warmed, and the preparation bit is set to "H". Goes into “c” (shown in Table 2), while the total current value I rises (shown in FIG. 6 (g)), the second heater 5 is turned on for a predetermined time (for example, 3).
If the total current value I is not equal to or more than 19 A until the time (0 seconds) elapses, the current operating frequency of the compressor 8 is maintained as it is (shown in (h) of the figure).

In addition, 30 seconds after the second heater 5 is turned on.
After a lapse of seconds, the total current bits A, B from the indoor unit controller 1
Based on (“H”, “L”), for example, every 0.8 seconds,
Until the operating frequency of the compressor 8 is increased by 1 Hz and the total current value I is within the range of 18 A or more and 19 A or less,
The operating frequency is increased (shown in (h) of the figure).

At this time, if the total current value I is 19 A or more, the total current bits A and B become "L" and "L" so that the total current value I does not exceed the maximum allowable current value. Therefore, conversely, the current operating frequency is decreased by 1 Hz every 0.8 seconds.

When the total current value I is in the range of 18 A or more and 19 A or less, the operating capacity of the air conditioner can be maximized, so that the current operating frequency is maintained.

When the total current value I becomes 12 A or less, the total current bits A and B become "H" and "H", and the current operating frequency is 0. Every 4 seconds, it is increased by 1 Hz.

Thereafter, the release operation is performed so that the total current value I falls within the range of 18 A or more and 19 A or less, the first and second heaters 4 and 5 are in the ON state, and the compression is performed. The loss of operating ability of the machine 8 can be suppressed.

Thus, the first and second heaters 4,
In the ON state of No. 5, when the total current value I is low, the operating frequency increase interval of the compressor 8 is shortened, that is, when the total current value I is high, the operating frequency increase interval is increased, That is, since the frequency is slowly increased, it is not necessary to set the current limit value of the outdoor unit to be less than the normal value range, and the total current value I is the maximum allowable current even when the consumption current of the electric heater fluctuates. Since the value does not exceed the value and can be within the normal value range, the loss of the operating capacity of the compressor 8 can be suppressed, and thus the operating capacity of the air conditioner can be maximized. be able to.

As shown in FIG. 3, in the indoor unit controller 1,
It is assumed that it is determined that only one heater, for example, the second heater 5 of the two heaters that are actually on should be turned off.

In this case, the first and second heaters 4 and 5 are in the ON state, that is, the preparation bit is at the "H" level and the heater bit is at the "L" level ((a) in the figure). And (b)), when the second heater 5 is turned off (shown in (f) of the same figure), the total current value I decreases by the current consumption of the second heater 5, Release operation is performed.

Then, in order to set the operating frequency of the compressor 8 to the target frequency, the operating frequency is increased,
The operating frequency is variably controlled so that the total current value I falls within the range of 18 A or more and 19 A or less.

For example, as shown in FIGS. 7C and 7D, when the total current bits A and B are both at "L" level, that is, when the total current value I exceeds 19A, The operating frequency is lowered so that the total current value I does not exceed the maximum allowable current value. Further, when the total current bit A becomes "H" level and the total current bit B becomes "L" level, that is, when the total current value I becomes 18 A or less, the operating capacity of the compressor 8 is lowered. In order to prevent this, the operating frequency is increased.

As shown in FIG. 4, in the indoor unit controller 1,
For example, it is assumed that when the first heater 4 is on and the second heater 5 is off, it is determined that the second heater 5 also needs to be turned on. That is, as shown in Table 2, the heater mode is changed from "f" to "g".

In this case, since the preparation bit is set to the "L" level and the heater bit is kept at the "L" level, the heater mode "f" is entered. At this time, the total current value I is 12 A or more. In some cases, the operating frequency of the compressor 8 is decreased by 1 Hz every 0.4 seconds.

When the total current value I is 12 A or less, the total current value I does not exceed the maximum allowable current value even when the second heater 5 is turned on, so that the operating frequency is maintained as it is. To be

When the total current value I decreases and becomes 12 A or less (shown in FIG. 6 (g)), the total current bits A and B both become "H" and "H", so that the operating frequency is the current state. To be maintained. At the same time as maintaining the current operating frequency, the second heater 5 is turned on (shown in FIG. 4 (f)), and at this time the preparation bit is set to "H".
Enter heater mode "g". That is, the total current value I is 1
This is because the total current value I does not exceed the maximum permissible current value even if the second heater 5 is turned on as long as it drops to 2A.

Further, when the second heater 5 is turned on, the total current value I sharply rises due to its characteristics and then stabilizes to a small value. Therefore, 30 seconds have elapsed since the second heater 5 was turned on. Until then, unless the total current value I is 19 A or more, the operating frequency is maintained as it is (shown in (h) of the same figure). As a result, the total current value I increases by the current consumption of the second heater 5, but does not exceed the maximum allowable current value.

When 30 seconds have passed since the second heater 5 was turned on and the current consumption of the second heater 5 was stabilized to a small value, in order to maximize the operating capacity of the air conditioner, The current operating frequency is increased.

At this time, the total current value I is 12 A or more, 18
Within the range of A or less (total current bits A, B;
"H", "L"), that is, when the total current value I is high to some extent, the current operating frequency is increased by 1 Hz, that is, slowly, every 0.8 seconds.

When the total current value I is 12 A or less,
The operating frequency is 1 Hz every 0.4 seconds so that the operating capacity of the air conditioner is maximized as quickly as possible.
One by one, that is, it rises fast.

When the total current value I is within the range of 18 A or more and 19 A or less, the operating capacity of the air conditioner can be maximized, so that the operating frequency is maintained as it is.

When the total current value I is 19 A or more,
The operating frequency is decreased by 1 Hz every 0.8 seconds so that the total current value I does not exceed the maximum allowable current value.

In this way, like the above, the total current value I is set within the range of 18 A or more and 19 A or less.
The release operation is performed.

As shown in FIG. 5, in the indoor unit control section 1,
For example, when the heating operation is started, the first and second temperatures are detected due to the difference between the temperature detected by the indoor temperature sensor and the set temperature of the remote controller.
It is assumed that it is determined that the heaters 4 and 5 of 1 must be turned on at the same time. That is, as shown in Table 2, this is the case of the heater mode “h”.

In this case, when the power is turned on, the heater bit is set to the "L" level, and the first and second heaters 4 and 5 are
Is turned on. On the other hand, the compressor 8 is controlled to the target operating frequency.

Then, the total current value I rises from 0 A, but since it is initially 12 A or less, the total current bit A,
Since B becomes "H" and "H", the operating frequency of the compressor 8 is increased by 1 Hz every 0.4 seconds, and quickly approaches the target frequency.

The total current value I is 12 A or more, 18 A
When it falls within the following range, the total current bit A,
Since B is changed from "H", "H" level to "H", "L" level, its operating frequency is 1H every 0.8 seconds.
Each z, that is, slowly raised. That is, the current consumption of the first and second heaters 4 and 5 may cause the total current value I to sharply increase and exceed the maximum allowable current value.

Since the current consumption of the first and second heaters 4 and 5 rises to a predetermined value due to their characteristics, the operating frequency of the compressor 8 is kept to a predetermined value (for example, 1 minute from the time when they are turned on). (58 Hz), the operating frequency is maintained as it is even though the total current bits A and B are at "H" and "L" levels.

After the lapse of one minute, the current consumption of the first and second heaters 4 and 5 stabilizes at a small value.
The operating frequency is increased again according to the heat mode “h”.

At this time, the total current value I is 12 A or more,
In the range of 18 A or less (total current bits A, B;
"H""L"), the frequency is increased by 1 Hz every 0.8 seconds. When the total current value I is as low as 12 A or less (total current bits A and B; "H" and "H"), the operating frequency of the air conditioner is 0 so that the operating capacity of the air conditioner can be promptly maximized. Every 1 second, the frequency is increased by 1 Hz.

When the total current value I rises and falls within the range of 18 A or more and 19 A or less (total current bit A,
B; "L", "H"), the operating frequency is maintained as it is,
And as already explained, the operating frequency is raised or lowered by the total current value I, that is, the total current value I is set to 18
Since it falls within the range of A or more and 19 A or less, the release operation is performed.

As shown in FIG. 6, in the indoor unit controller 1,
For example, it is assumed that it is determined that only one of the first and second heaters 4 and 5 needs to be turned on due to the difference between the temperature detected by the indoor temperature sensor and the set temperature of the remote controller. That is, as shown in Table 2, the heater mode is changed from "d" to "e".

In this case, in the indoor unit controller 1, for example, when the preparation bit is set to the "L" level to turn on the first heater 4, the heater mode "d" is entered. At this time,
When the total current value I is 12 A or more, that is, within the range of 12 A or more and 18 A or less (total current bits A and B;
"H", "L") or within the range of 18A or more and 19A or less (total current bits A, B; "L",
"H"), the operating frequency of the compressor 8 is 1H every 0.4 seconds.
It is descended by z.

When the total current value I is 19 A or more, even if the first heater 4 is turned on, the maximum allowable current value is not exceeded, so that the operating frequency is maintained as it is. .

Due to the drop in the operating frequency, the total current value I
Becomes 12A or less (total current bit A, B; “H”,
"H"), the first heater 4 is turned on, and the heater mode enters "e".

Then, the total current value I sharply rises to 12
Since it falls within the range of A or more and 18 A or less (total current bits A, B; “H”, “L”), the operating frequency is the current status until 30 seconds elapse after the first heater 4 is turned on. To be maintained. That is, the current consumption of the first heater 4 is initially large, and when the operating frequency is increased, the total current value I
May exceed the maximum allowable current value.

After the lapse of 30 seconds, the second heater 5
Since the current consumption is stabilized at a small value, the operating frequency is increased by 1 Hz every 0.8 seconds if the total current value I is within the range of 12 A or more and 18 A or less.

When the total current value I is 12 A or less,
The operating frequency is increased by 1 Hz every 0.4 seconds so that the operating capacity of the air conditioner can be promptly maximized.

If the total current value I is in the range of 18 A or more and 19 A or less, the operating frequency of the air conditioner is maintained because the operating capacity of the air conditioner can be maximized.

When the total current value I is 19 A or more,
The operating frequency is decreased by 1 Hz every 0.8 seconds so that the total current value I does not exceed the maximum allowable current value.

Then, the total current value I rises to 18 A
Above, within the range of 19A or less (total current bit A,
B "L", "H"), its operating frequency is maintained as it is, and, as already explained, its total current value I is 18A.
As described above, the release operation is performed within the range of 19A or less.

As shown in FIG. 7, in the indoor unit controller 1,
For example, it is assumed that it is determined that the first heater 4 in the on state is turned off, that is, all the heaters are in the off state, based on the difference between the temperature detected by the indoor temperature sensor and the set temperature of the remote controller.

In this case, when the first heater 4 is turned off, the total current value I is reduced by the current consumption of the first heater 4, but the total current value I is in the range of 18 A or more and 19 A or less. The release operation is performed so as to fit inside.

At this time, the total current value I is 18 A or more, 19
If it is in the range of A or less, the total current value I falls within the range of 18 A or less and 12 A or more by turning off the first heater 4, so that the total current bit A is “H” and the total current bit B is It becomes "L".

Then, the outdoor unit controller 2 compresses the total current bits A and B ("H" and "L") so that the total current value I falls within the range of 18A or more and 19A or less. Control is performed with the operating frequency of the machine 8 as the target frequency. That is, until the total current value I reaches 18A,
The operating frequency is increased and the total current value I is 19
When it exceeds A, the operating frequency is lowered.

In the above embodiment, the case where the number of built-in electric heaters is two has been described, but even if there are two or more heaters, the operating method of the air conditioner can be improved by applying the above control method. You can make the most of it.

[0073]

As described above, according to the present invention, two electric heaters are built in the indoor unit, the electric heaters are turned on and off as needed, and the compressor of the outdoor unit is rotated at the target speed. In a method of controlling an air conditioner of an inverter system that maintains the room at a preset temperature by controlling the number of the air conditioners, a total current sensor for detecting the total operating current of the air conditioner is provided, and from the control unit of the indoor unit. At least the preparation data for turning on the electric heater is obtained, and the preparation data, the status data of the electric heater and the data of the detection operation total current value are transmitted, and the control unit of the outdoor unit that receives these data. Before turning on the electric heaters, the total operating current value should be below a predetermined value.
In addition, the operating frequency of the compressor (so that the operating capacity of the air conditioner can be maximized) falls within the normal range of the operating total current value after a lapse of a predetermined time from turning on the electric heaters. Since the number of revolutions is controlled, it is not necessary to set the current limit value on the outdoor unit side to a value that is reduced by the maximum current value of the electric heater, and even when the current consumption changes when the electric heater is turned on. Since the operating total current value can be maintained within the normal value range, that is, at a high value, the compressor operating loss can be eliminated, that is, the operating capacity of the air conditioner can be maximized. Therefore, the operation efficiency can be improved.

[Brief description of drawings]

FIG. 1 is a schematic block diagram of an air conditioner to which an embodiment of the present invention is applied and to which a control method is applied.

FIG. 2 is a time chart diagram for explaining a control method of the air conditioner shown in FIG.

FIG. 3 is a time chart diagram for explaining a control method of the air conditioner shown in FIG.

FIG. 4 is a time chart diagram for explaining a control method of the air conditioner shown in FIG. 1.

FIG. 5 is a time chart diagram for explaining a control method of the air conditioner shown in FIG. 1.

FIG. 6 is a time chart diagram for explaining a control method of the air conditioner shown in FIG. 1.

FIG. 7 is a time chart diagram for explaining a control method of the air conditioner shown in FIG. 1.

FIG. 8 is a current characteristic graph diagram of an electric heater (PTC semiconductor ceramics heater).

[Explanation of symbols]

1 Indoor unit control unit 2 Outdoor unit control unit 3 Total current sensor (CT) 4 First heater unit (PCT semiconductor heater; ceramics heater) 5 Second heater unit (PCT semiconductor heater; ceramics heater) 6, 7 Switch 8 Compressor

Claims (2)

[Claims] 1. An indoor unit is provided with a plurality of electric heaters, the electric heaters are turned on and off as necessary, and a compressor of an outdoor unit is controlled to a target rotation speed to bring a room to a set temperature. In a control method of an inverter type air conditioner for maintaining, a total current detection means for detecting an operating total current of the air conditioner is provided, and preparation data for turning on the electric heater in the indoor unit, The data of the ON / OFF state of the electric heater is obtained, and the data of the detected total current value, the preparation data, and the data of the ON / OFF state of the electric heater are transmitted to the outdoor unit, and the outdoor unit uses the data. ,
Before the electric heater is turned on, the rotation speed of the compressor is variably controlled so as to keep the total current value below a predetermined value during a predetermined time period, and after the predetermined time period, the total current value is normally set. A method for controlling an air conditioner, wherein the number of revolutions of the compressor is variably controlled to the target number of revolutions so as to fall within a range of values. 2. The number of the electric heaters is two, and when one electric heater is turned on and one electric heater is further turned on after a predetermined time has passed, after turning on the first electric heater, After a lapse of a predetermined time, the total operating current value is suppressed to a predetermined value or less, the next electric heater is turned on, and after the lapse of a predetermined time from the turning on of the electric heater, the total current value is kept within a normal value range. The method for controlling an air conditioner according to claim 1, wherein.