JP3983571B2 - Air conditioner - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an air conditioner that performs thermo-off control during heating operation.
[0002]
[Prior art]
In a wall-mounted separate air conditioner or an integrated air conditioner, there are conventionally two types of operation control when performing so-called thermo-off, in which operation is interrupted during heating operation. Drive the blower while the compressor is stopped, keep the air flowing, start the compressor again when the thermo is turned on again, and raise the room temperature (hereinafter referred to as hot key press operation). The compressor and the blower are stopped and the compressor is forcibly turned on in order to detect the room temperature every certain period of time, and the room temperature is detected only when the room temperature is lowered. When the air blower is continuously driven and the room temperature is high, there is a method of stopping the compressor and the air blower again (hereinafter referred to as hot keep operation).
[0003]
The advantage of hot key press operation is that the compressor starts at a good timing, so that complicated control is unnecessary. Disadvantages are that a wind with a cool wind feeling is generated regardless of which direction the air is directed by wind direction control, and the user's feeling of use deteriorates.
[0004]
On the other hand, the advantage of hot-keeping operation is that the compressor is always started to generate warm wind, so that no uncomfortable feeling like cold wind is generated. Disadvantages are that the room temperature is measured while starting the compressor, regardless of the room temperature, even if the room gets too warm or the doors and windows open and the temperature suddenly drops. It can be said that the compressor is stopped until room temperature detection is performed at regular intervals.
[0005]
[Problems to be solved by the invention]
In any case where the above-described operation control is performed, when the air volume is automatically operated, when the heating operation is performed after the thermo-off, the operation is performed with a light wind so that the room temperature does not increase excessively. For this reason, it is difficult for hot air to reach the floor from an air conditioner mounted on a high wall. If such a situation continues, although the room temperature itself is high, the floor is cold, so that a feeling of use may be remarkably deteriorated. In particular, the above situation is likely to occur when the thermo-off control is started before the floor is warmed.
[0006]
As a specific example, there may be mentioned a case where the set temperature and the room temperature are close at the start of operation. That is, since the room temperature is close to the set temperature, in the case of automatic wind direction and automatic air volume, start from a state where the wind speed is weak. At this time, the wind direction is directed downward, and is directed to send warm air to the floor. However, because the air volume is small, the warm air whose specific gravity is lighter than the surrounding air rises before it reaches the floor, and the floor itself does not warm so much. Then, the set temperature is reached immediately, and the thermo-off control is started from this point, but the floor remains cold.
[0007]
In such a case, if the floor is to be warmed in subsequent operation control, the user can only change the setting such as manually increasing the air volume, and the operation is troublesome.
[0008]
In particular, in a type of air conditioner in which the operation frequency of the compressor cannot be controlled (hereinafter referred to as a normal type), during hot keep operation, the room temperature tends to rise too much when the heat load is light. This is because the operating frequency of the compressor cannot be controlled, so it must be controlled by the operating time of the compressor, but in order to ensure the reliability of the compressor, it is necessary to keep operating for a certain time after starting once. This is because the operation time becomes longer than necessary.
[0009]
In view of the above, an object of the present invention is to provide an air conditioner that can eliminate indoor temperature unevenness while preventing an excessive increase in room temperature.
[0010]
[Means for Solving the Problems]
The problem-solving means according to the present invention includes a control device that drives and controls the compressor and the blower based on the set temperature and the detected room temperature, and the control device compresses the compressor when the room temperature exceeds the set temperature during heating operation. Performs a thermo-off to stop the machine and the blower, and performs a normal operation to drive the compressor and the blower when detecting the room temperature at the time of the thermo-off, but forcibly operation that has intermittently enhanced the driving ability than the normal operation and the normal operation It has a means to perform either of these. For example, normal operation is intermittently performed at the time of thermo-off, and forced operation is performed when normal operation is performed a predetermined number of times.
[0011]
Normal operation and forced operation are performed when the room temperature is measured, and are performed at regular intervals. When the thermostat is off, the room temperature is higher than the set temperature. Therefore, as the normal operation, an operation with a reduced driving capacity is performed so that the warm air does not spread.
[0012]
At this time, the room temperature is high, but the temperature near the floor may be low. Therefore, since the normal operation is intermittently performed when the thermo-off is performed, the forced operation is performed instead of the normal operation at an arbitrary timing. Then, the blown warm air reaches the floor, the floor is warmed, and the temperature unevenness in the room is eliminated.
[0013]
Moreover, it is good to perform forced operation as the first driving | running after starting thermo-off. In the situation where the thermo-off is performed immediately after the heating operation, the vicinity of the floor is often not sufficiently heated. In such a case, if forced operation is performed for the first time, warm air can be blown out toward the floor, the vicinity of the floor can be quickly heated, and a comfortable indoor environment can be obtained.
[0014]
And when the ventilation means which changes the direction of the wind blown off by the air blower is provided, the control device, when performing normal operation or forced operation, the air blowing means so that the warm air above is directed to the wind toward the floor It shall have a means to actuate.
[0015]
By changing the direction of the wind during operation, the warm air is reliably blown toward the floor. Accordingly, warm air does not stay upward, the temperature near the floor is increased, and the temperature unevenness in the room can be reliably eliminated.
[0016]
Further, the control device includes means for operating the air blowing means so that the wind direction returns to the state before the operation when the normal operation or the forced operation is stopped. When the operation is stopped and the thermo-ON is performed as it is, the desired heating operation is not performed if the wind direction remains changed. However, by returning the wind direction to the original state, even if the heating operation is started immediately, the operation as desired by the user can be performed, and a user-friendly air conditioner can be realized.
[0017]
Here, as the forced operation, it is assumed that the air volume is higher than that in the normal operation, or the operation frequency of the compressor is higher than that in the normal operation. Further, the air volume and the operating frequency may be increased. These may be selected depending on the type of the air conditioner.
[0018]
In addition, the control device includes means for lowering the set temperature when the room temperature is higher than the set temperature by a predetermined temperature or more when the thermo is off. When the room temperature rises by performing normal operation or forced operation, normal temperature control cannot be performed. In such a state, it is an effective control method to lower the set temperature. That is, when the set temperature is lowered, the temperature at which the thermo-on is performed is also lowered, and as a result, the thermo-off period is lengthened. Therefore, the room temperature decreases during this period, and an unnecessary temperature increase can be suppressed.
[0019]
Instead of lowering the set temperature as described above, when the room temperature is higher than the set temperature by a predetermined temperature, the interval for performing the normal operation may be increased. By increasing the operation interval, the factor for raising the room temperature is reduced, and the room temperature can be lowered.
[0020]
In addition, the control device includes means for raising the set temperature when the room temperature is lower than the set temperature by a predetermined temperature. When the thermal load increases due to a decrease in the outside air temperature or the like and the room temperature decreases too much, particularly when the set temperature is changed as described above, the set temperature is changed to be increased. For example, by raising the temperature to the original set temperature, the start of the thermo-on can be accelerated, and a decrease in room temperature can be suppressed.
[0021]
As described above, by changing the set temperature according to the state of the room temperature when the thermo-off is performed, it is possible to perform fine temperature control and suppress temperature fluctuations to be small.
[0022]
DETAILED DESCRIPTION OF THE INVENTION
(First embodiment)
The air conditioner of the first embodiment is a separate normal type in which an indoor unit is attached to a wall surface of a room. In addition, when an air conditioner is an integral type, it is attached to a window. As shown in FIG. 1, the air conditioner includes a control unit 4 for controlling driving of the compressor 1, the indoor fan (blower) 2, the louver 3, and the like.
[0023]
The control unit 4 composed of a microcomputer performs an air conditioning operation based on input signals from the operating condition input means 5 and the temperature detection means 6. In general, the operation condition input means 5 comprises a remote controller, and sets operation conditions such as operation on / off, wind direction, air volume, set temperature, and operation selection. The temperature detection means 6 is a room temperature sensor that detects the room temperature, a temperature sensor that detects the temperature of the heat exchanger, and a temperature sensor that detects the outdoor temperature.
[0024]
The control unit 4 obtains necessary information such as room temperature, outside air temperature, heat exchanger temperature and the like from an input signal from the temperature detection means 6 and the compressor 1, the indoor fan 2, and the outdoor fan according to the set operating conditions. The louver 3 and the like are driven. Then, during the heating operation, it is determined whether or not the room temperature has reached the set temperature. When the set temperature is exceeded, the thermo-off is performed by the hot keep operation that stops the compressor 1 and the indoor fan 2. Further, when the room temperature is lowered to the set temperature, a thermo-on for driving the compressor 1 and the indoor fan 2 is performed.
[0025]
The compressor 1 in the normal type air conditioner is driven and controlled only on / off. The indoor fan 2 is subjected to three-stage switching control, and the air volume is determined in the order of strong wind, weak wind, and light wind. The louver 3 is a blowing means that automatically changes the angle by a motor and changes the wind direction.
[0026]
In addition, the control unit 4 detects the room temperature when the thermo-off is performed by the hot keep operation, and performs normal operation for driving the compressor 1 and the indoor fan 2 in order to eliminate room temperature unevenness while preventing the room temperature from being excessively increased. One of the forced operation and the forced operation with higher driving ability than the normal operation is performed. This control will be described with reference to FIGS.
[0027]
Heating operation is started and the room temperature is detected by a room temperature sensor. The operation is continued until the room temperature reaches the set temperature. When the room temperature reaches the set temperature, the thermo-off is performed and the compressor 1 and the indoor fan 2 are stopped. Then, after a predetermined time has elapsed, for example, after about 3 minutes, the compressor 1 and the indoor fan 2 are driven in order to detect the first room temperature. At this time, the wind direction is set to be about 50 ° below the horizontal. The presence or absence of a change in the wind direction is determined according to the state of the louver 3 at the start of thermo-off, and the louver 3 is activated. That is, depending on the operating conditions, the angle of the louver 3 may not be directed downward. In this state, the louver 3 is forcibly adjusted to the specified angle. Note that this angle of 50 ° is an example, and the optimum angle varies depending on the size of the room, the capacity of the air conditioner, and the air volume, so that the warm air above can be delivered to the floor. You only have to set it.
[0028]
In the first operation, the forced operation is performed by setting the air volume to a strong wind and a wind stronger than the light wind. At this time, there is a high possibility that the floor has not yet been heated, and even if the air volume is increased, there is no problem. By strengthening the wind, the warm air reaches the floor, the indoor air is circulated, and the temperature unevenness in the room is eliminated. Since there is a problem of feeling of use such as noise, a wind of a weak wind level that is stronger than a light wind is preferable in actual use.
[0029]
After the operation for about 3 minutes, the room temperature is measured by the room temperature sensor, and the next operation content is determined based on the detected room temperature. For example, when the room temperature is still higher than the set temperature, it is determined that the thermo-off is continued. In this case, the driving of the compressor 1 and the indoor fan 2 is stopped again, and when the wind direction is changed, the louver 3 is returned to the original state.
[0030]
As for the method for determining the next operation content, as shown in FIG. 3, there is a thermo-on / off-line corresponding to the set temperature, and the next operation content is determined depending on whether the room temperature exceeds the thermo-on / off-line. . When the room temperature is higher than the set temperature, that is, in the region above the thermo on / off line, the thermo is off. Here, a switching line is set above the thermo-on / off-line to switch the contents of the hot keep operation. The switching line is set according to the operation switching temperature that is higher than the set temperature by a predetermined temperature. The area between the switching line and the thermo on / off line is the hot keep 1 area, and the area above the switching line is hot. This is the keep 2 area.
[0031]
In the hot keep 1 area, the operation is stopped for about 3 minutes, and in the hot keep 2 area, the operation is stopped for about 6 minutes. That is, when the room temperature is in the hot keep 2 region, the temperature is much higher than the set temperature, so that the time until the room temperature approaches the set temperature is longer than when the room temperature is in the hot keep 1 region. Therefore, it is not necessary to measure the room temperature in a short time, and the timing for performing the next normal operation can be delayed. Thus, by adjusting the timing so that the normal operation interval becomes longer, an excessive temperature rise can be prevented and the room temperature can be controlled. In addition, by not performing the operation at short intervals, unnecessary operation time can be reduced and energy saving can be achieved.
[0032]
Here, in the case of a normal type air conditioner, since the heat load is light when the outside air temperature is high, the room temperature may rise at a stretch of about 6 ° C. in one operation. Therefore, it is determined how much higher the room temperature is than the set temperature. When the room temperature is higher than the set change temperature, the control unit 4 changes the set temperature so as to lower it. When the room temperature is below the set change temperature, the set temperature is not changed.
[0033]
That is, a correction line is set above the thermo-on / off-line and switching line, and when the room temperature becomes higher than the correction line, the set temperature is changed. The correction line is set according to a setting change temperature higher than the set temperature and the operation switching temperature, for example, (set temperature + 3 ° C.). If the room temperature rises beyond the correction line, the set temperature is lowered by 1 to 2 ° C. Since the thermo-on / off-line is also lowered by changing the set temperature in this way, it is obvious that the thermo-off control is executed early. Therefore, an increase in room temperature can be suppressed.
[0034]
In addition, when the thermo-off is continued, it is checked how many times the above operation has been performed. When the operation is performed a specific number of times, for example, once, after a predetermined stop time has elapsed, the compressor 1 and the indoor fan 2 are driven again to perform room temperature detection. At this time, normal operation is performed with the wind direction facing downward and the air volume being light, and the warm air is prevented from circulating in the room so as to suppress the rise in room temperature as much as possible.
[0035]
When the above operation is repeated a specific number of times, for example, twice or more, forcible operation is performed after a predetermined stop time has elapsed, and the indoor fan 2 is driven with strong wind. When the floor is sufficiently warm, as shown in FIG. 4 (b), even if it is a breeze, the wind reaches from the indoor unit 7 to the far side of the floor, but when the floor is not warm, FIG. ) As shown in the figure, the warm air rises up. If a sensor capable of detecting the floor temperature is provided, the temperature can be controlled. However, since the cost increases, it is not generally provided. Therefore, even if the temperature distribution of the floor is not known, by performing forced operation with a strong wind, the floor is not warmed as shown in FIG. However, it can deliver hot air to a distant place and eliminate uneven temperature in the room.
[0036]
The room temperature is measured, and when the detected room temperature becomes lower than the set temperature, it is determined that the thermo-ON is performed. At this time, it is checked whether a change to lower the set temperature has been made. When this change is not made, the operation is continued as it is, and the heating operation is performed until the thermo is turned off again. The air volume control is a normal control in the heating operation. When the thermo-on is performed, the louver 3 is operated so that the wind direction returns to the original set state.
[0037]
By the way, when the heat load increases such that the outside air temperature decreases and the room temperature decreases, the room temperature may decrease too much. When the thermostat is turned off by changing the setting temperature to be lower, if the above situation occurs, it becomes difficult to control the room temperature to the original setting temperature. Therefore, the control unit 3 determines whether the room temperature is lower than the setting change release temperature. If the room temperature is lower, the control unit 3 raises the setting temperature and changes it back. If the room temperature is higher than the setting change release temperature, the heating operation is continued.
[0038]
That is, the correction cancellation line is set below the thermo-on / offline, and the set temperature is changed when the room temperature becomes lower than the correction cancellation line. The correction release line is set according to a setting change release temperature lower than the set temperature, for example, (set temperature-3 ° C.). The setting change release temperature is set to a temperature lower than the changed setting temperature. If the room temperature falls too low beyond the correction release line, the correction of the set temperature is canceled and the original set temperature is restored. Thereafter, the thermostat is turned on, the compressor 1 and the indoor fan 2 are continuously operated, and the heating operation is performed under the operation condition corresponding to the set temperature. This makes it possible to establish temperature control that can cope with a wider range of thermal load fluctuations.
[0039]
(Second Embodiment)
The air conditioner of the present embodiment is a type that can vary the operating frequency of the compressor 1 by an inverter circuit (referred to as an inverter type). The control unit 4 intermittently performs a normal operation when the thermostat is off, and performs a forced operation instead of the normal operation when the normal operation is performed a predetermined number of times. Other configurations are the same as those in the above embodiment.
[0040]
As shown in FIG. 5, when the heating operation is started and the detected room temperature becomes higher than the set temperature, the thermo-off is performed. The compressor 1 and the indoor fan 2 are driven to detect the room temperature after a certain time has elapsed since the start of the thermo-off. At this time, the air volume is a slight wind, and the operating frequency of the compressor 1 is a normal operating frequency, for example, an operating frequency during heating operation. The room temperature is measured after the normal operation for about 3 minutes, and the next operation content is determined based on the detected room temperature.
[0041]
When the room temperature is below the set temperature, the thermo is turned on and the operation is continued. When the room temperature is higher than the set temperature, it is checked whether normal operation has been performed a predetermined number of times. When the normal operation is performed less than a predetermined number of times, for example, only once, the thermo-off is continued. The driving of the compressor 1 and the indoor fan 2 is stopped again, and a normal operation is performed after a certain period of time to detect the room temperature.
[0042]
When the normal operation is repeated a predetermined number of times, for example, twice or more, and the thermo-off is continuously performed, the forced operation is performed. In the forced operation, the air volume is increased or decreased, and the operation frequency of the compressor 1 is set higher than that during normal operation. Thereafter, the above operation is repeated.
[0043]
In this way, by applying the forced operation during the normal operation, the warm air blown from the indoor unit reaches the floor to warm the vicinity of the floor. Therefore, circulation of indoor air is promoted, temperature unevenness can be eliminated while suppressing an increase in indoor temperature, and a comfortable indoor environment can be obtained.
[0044]
(Third embodiment)
In the control part 4 of this embodiment, when room temperature is higher than setting change temperature, it changes so that setting temperature may be lowered | hung. Other configurations and operations are the same as those of the second embodiment.
[0045]
As shown in FIG. 6, when thermo-off is performed, normal operation is performed and the room temperature is detected. Then, the detected room temperature is determined, and as a result, it is determined whether or not to continue the thermo-off. When the thermo-off is continued, it is determined whether the room temperature is higher than the set change temperature (set temperature + 3 ° C.). When the room temperature is higher than the set change temperature, lower the set temperature. Thereafter, the thermo on / off is determined based on the changed set temperature. When the room temperature becomes lower than the setting change temperature and it is determined that the thermo-ON is performed, the heating operation is performed as it is.
[0046]
When the heat load is light, such as when the outside air temperature is high, the room temperature may rise even if the compressor 1 is driven at, for example, the lowest operating frequency in normal operation when the thermostat is off. In such a case, by changing the setting temperature so as to decrease, the thermo-ON timing can be delayed, and the increase in the room temperature can be suppressed.
[0047]
(Fourth embodiment)
In the control part 4 of this embodiment, after changing so that setting temperature may be lowered | hung, when room temperature falls too much from setting temperature, it changes so that setting temperature may be raised. Other configurations and operations are the same as those of the third embodiment.
[0048]
As shown in FIG. 7, when the thermo-off is performed, the normal operation is performed, and if it is determined to perform the thermo-on based on the detected room temperature, it is determined whether or not the set temperature has been changed. If not changed, the thermo-on is performed as it is. If it has been changed, when the room temperature drops below the setting change release temperature lower than the set temperature, the set temperature is returned to the original set temperature, and then the thermo-ON is performed. When the room temperature is higher than the setting change release temperature, the thermo-ON is performed with the set temperature as it is. At this time, the heating operation is performed based on the changed set temperature.
[0049]
Thus, even if the room temperature greatly decreases during the thermo-off, the room temperature can be rapidly increased by performing the thermo-on by increasing the set temperature. Therefore, by controlling the operation by changing the set temperature, it is possible to perform temperature control that can cope with large fluctuations in the heat load.
[0050]
(Fifth embodiment)
In the control part 4 of this embodiment, thermo-off is performed and forced operation is performed as the operation at the time of the first room temperature detection. As this forced operation, the air volume is made strong or weak and the operating frequency of the compressor 1 is made higher than during normal operation. Other configurations and operations are the same as those of the second embodiment.
[0051]
As shown in FIG. 8, after the thermo-off is started, the first operation is set to forced operation. Thereafter, the normal operation is performed, and the normal operation is continuously performed a predetermined number of times. When the thermo-off is continuously performed, the forced operation is performed.
[0052]
By making forced operation the first operation when the thermo is off, warm air is supplied toward the floor, so that the floor is warmed when the thermo-off is performed in a state where the room temperature is high but the floor is not yet warm. It can work effectively and can realize a comfortable indoor environment.
[0053]
(Sixth embodiment)
The control unit of the present embodiment changes the wind direction when performing forced operation. Other configurations and operations are the same as those of the second embodiment.
[0054]
As shown in FIG. 9, when the forced operation is performed after the normal operation is continued a predetermined number of times when the thermo is off, the louver 3 is operated so that the air volume is increased and the warm air is directed toward the floor. That is, the wind direction is forced downward. When the forced operation ends, the louver 3 is returned to the original state.
[0055]
In this way, even when the wind direction is set manually rather than automatically, the effect of increasing the air volume can be increased by warm air blowing toward the floor by forcibly changing the wind direction. Uneven temperature can be reliably eliminated.
[0056]
In addition, this invention is not limited to the said embodiment, Of course, many corrections and changes can be added to the said embodiment within the scope of the present invention. For example, normal operation and forced operation may be performed alternately. At this time, in order to suppress the rise in temperature, the drive of the compressor is minimized and the air volume is increased. Moreover, you may make it determine the timing which performs forced operation according to room temperature. In other words, the frequency of forced operation is increased as the room temperature is higher than the set temperature, so that warm air reaches the floor to warm the vicinity of the floor.
[0057]
In the inverter-type air conditioner, those in the second to sixth embodiments may be combined. For example, when the second and third embodiments are combined, the result is as shown in FIG. When the second, third, and fourth embodiments are combined, the result is as shown in FIG. When the second, third, and sixth embodiments are combined, the result is as shown in FIG. When the second, third, fourth, and sixth embodiments are combined, the result is as shown in FIG. When the second, third, and fifth embodiments are combined, the result is as shown in FIG. When the second, third, fourth, and fifth embodiments are combined, the result is as shown in FIG. When the second, third, fifth, and sixth embodiments are combined, the result is as shown in FIG. When the second, third, fourth, fifth, and sixth embodiments are combined, the result is as shown in FIG. Moreover, also in a normal type air conditioner, you may each carry out independently like 2nd Embodiment-6th Embodiment, and you may combine each as mentioned above.
[0058]
【The invention's effect】
As is apparent from the above description, according to the present invention, in the normal operation that is intermittently performed during the thermo-off, the hot air is circulated indoors by performing a forced operation with a higher driving ability than the normal operation. And uneven temperature in the room can be eliminated. At this time, by adjusting the direction of the wind so that the warm air reaches the floor, the warm air spreads far away, and there is no situation where the floor is left cold despite the high room temperature. And a comfortable indoor environment can be obtained.
[0059]
Also, if the room temperature rises too much or falls too much when the thermostat is off, the temperature fluctuation can be kept small by changing the set temperature. Therefore, temperature control that can cope with a wide range of thermal load fluctuations can be established, and energy saving operation with less on / off can be performed.
[Brief description of the drawings]
FIG. 1 is a diagram showing the configuration of a control device for an air conditioner according to the present invention.
FIG. 2 is a flowchart at the time of thermo-off of the first embodiment.
FIG. 3 is a diagram showing a thermoline during heating operation.
FIG. 4 is a diagram showing the flow of air in the room
FIG. 5 is a flowchart at the time of thermo-off of the second embodiment.
FIG. 6 is a flowchart at the time of thermo-off of the third embodiment.
FIG. 7 is a flowchart at the time of thermo-off of the fourth embodiment.
FIG. 8 is a flowchart at the time of thermo-off of the fifth embodiment.
FIG. 9 is a flowchart at the time of thermo-off of the sixth embodiment.
FIG. 10 is a flowchart at the time of thermo-off when the second and third embodiments are combined.
FIG. 11 is a flowchart at the time of thermo-off when the second, third, and fourth embodiments are combined.
FIG. 12 is a flowchart at the time of thermo-off when the second, third, and sixth embodiments are combined.
FIG. 13 is a flowchart at the time of thermo-off when the second, third, fourth, and sixth embodiments are combined.
FIG. 14 is a flowchart at the time of thermo-off when the second, third, and fifth embodiments are combined.
FIG. 15 is a flowchart at the time of thermo-off when the second, third, fourth and fifth embodiments are combined;
FIG. 16 is a flowchart at the time of thermo-off when the second, third, fifth and sixth embodiments are combined;
FIG. 17 is a flowchart at the time of thermo-off when the second, third, fourth, fifth and sixth embodiments are combined.
[Explanation of symbols]
1 Compressor
2 Indoor fans
3 louvers
4 Control unit
5 Operating condition input means
6 Temperature detection means

Claims (8)

Provided with a control device that drives and controls the compressor and the blower based on the set temperature and the detected room temperature. When the room temperature exceeds the set temperature during the heating operation, a thermo-off is performed to stop the compressor and the blower. An air conditioner that performs a normal operation for driving the compressor and the blower to detect room temperature sometimes, and the control device intermittently increases the operation capacity compared to the normal operation and the normal operation when the thermo is off. Characterized in that it has means for performing either forced operation, means for detecting the room temperature after normal operation or after forced operation when the thermo is off, and means for lowering the set temperature when the detected room temperature is higher than the set temperature. Air conditioner to do. Controller, usually when ambient temperature detected at or after the forced operation after the operation only a predetermined temperature lower than the set temperature, the air conditioner according to claim 1, characterized in that it comprises a means for raising the set temperature during thermo-off. 3. The air conditioner according to claim 1 , wherein the control device includes means for performing a forced operation when the normal operation is continuously performed a predetermined number of times when the thermostat is off . Blower means for changing the direction of the wind blown out by the blower is provided, and the control device operates the blower means so that the warm air above is directed toward the floor when performing normal operation or forced operation. The air conditioner according to any one of claims 1 to 3, wherein the air conditioner is provided. 5. The air conditioner according to claim 4 , wherein the control device has means for operating the air blowing means so that the wind direction returns to the state before the operation when the normal operation or the forced operation is stopped. The air conditioner according to any one of claims 1 to 5 , wherein the control device performs a forced operation as an initial operation after the thermo-off is started. The air conditioner according to any one of claims 1 to 6 , wherein the forced operation has a higher air volume than that in the normal operation. The air conditioner according to any one of claims 1 to 7 , wherein in the forced operation, the operation frequency of the compressor is set higher than in the normal operation.

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