JPH10103739A - Air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable execution of a dehumidifying operation even in a state of low temperature and high humidity and also to prevent a feeling of discomfort of a resident due to hot or cold air. SOLUTION: This air conditioner is equipped with a room temperature sensor 15 detecting a room temperature and a control part 40 which enables execution of switchover to a manual operation mode wherein a heating operation is selected manually and to a dehumidification-preference automatic operation mode wherein either the heating operation or a dehumidifying operation is selected automatically on the basis of a detected value of the room temperature sensor 15, in execution of the operation, and which limits the air conditioning capacity at the time of the heating operation in the dehumidification-preference automatic operation mode to be lower than the air conditioning capacity at the time of this operation in the manual operation mode, in execution of the operation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dehumidifying method for automatically selecting one of a plurality of operating states including a dehumidifying operation based on a manual operation mode for manually selecting a heating operation and a detection value of a room temperature sensor. The present invention relates to an air conditioner that can be operated by switching to a priority automatic operation mode.

[0002]

2. Description of the Related Art In an air conditioner capable of switching operation between cooling and heating, a manual operation mode in which a user selects one of heating, cooling and dehumidification operation states. And an automatic operation mode for automatically selecting cooling, heating, or the like based on the outside air temperature or room temperature at the start of operation. In addition, in the automatic operation mode, there is a type that automatically selects ventilation and dehumidification in addition to cooling and heating. Further, when the room temperature or the like greatly changes during the operation in the automatic operation mode, there is a method in which this is detected and changed to an optimum state again. When these automatic driving modes are selected, there is no need for the user to set the driving mode, and even if the indoor or outdoor situation changes significantly during driving, the operation mode is selected and changed to an appropriate driving mode. There are advantages.

However, even if the dehumidifying operation is selected in the automatic operation mode, the main purpose is basically to make the room temperature reach the set temperature, and the room temperature is close to the set temperature and the humidity is high. Since the dehumidification operation was selected for the first time in the case, even if the operation to give priority to dehumidification under humid conditions such as during the rainy season was desired, the heating operation was not performed in the low temperature and high humidity condition where the room temperature was lowered. Selected. During this heating operation, the temperature of the air blown out of the air conditioner becomes high, and the user feels that the humidity has risen physically,
There is a problem in that the wind direction change plate faces obliquely downward and hot air blows out into the living area, thereby increasing user discomfort.

As another control example of the dehumidifying operation, a cooling operation is performed when the room temperature exceeds a target value by a predetermined value or more, and when the room temperature falls below the predetermined value, the operation returns to the dehumidifying operation. However, in this control method, there is no other way but to stop the operation in a low-temperature and high-humidity state where the room temperature is lowered, and there arises a problem that both the temperature and the humidity cannot be controlled.

Further, as another control example in the dehumidifying operation, there has been one in which the heating operation and the cooling operation are alternately performed at predetermined time intervals. However, in this method as well, the temperature of the air blown out of the air conditioner increases during the heating operation, and the user feels that the humidity has risen, and the wind direction change plate faces obliquely downward during the heating operation. There is a problem in that the discomfort of the user increases because the warm air blows out to the living area.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and enables a dehumidifying operation even in a low-temperature and high-humidity state, and can prevent occupants from feeling uncomfortable due to hot air or cold air. An object is to provide an air conditioner.

[0007]

According to the first aspect of the present invention, there is provided an air conditioner including a manual operation mode for manually selecting a heating operation and a heating operation or a dehumidifying operation based on a detection value of a room temperature sensor. It is possible to operate by switching to the dehumidifying priority automatic operation mode in which one is automatically selected, and the air conditioning capacity during the heating operation in the dehumidification priority automatic operation mode is lower than the air conditioning capacity during the heating operation in the manual operation mode. Since the control unit that operates with restriction is provided, by switching between the heating operation and the dehumidification operation in the dehumidification priority automatic operation mode, the dehumidification operation in a low-temperature and high-humidity state becomes possible.
The air-conditioning capacity (in this case, the heating capacity) is made lower than that in the normal operation by manual operation, so that it is possible to prevent the discomfort caused by the warm wind which tends to occur at low temperature and high humidity.

In the air conditioner according to the second aspect, the air conditioning capacity of the compressor is varied between a maximum value and a minimum value during a heating operation selected in the manual operation mode and the dehumidifying priority automatic operation mode. Since the maximum value of the air conditioning capacity in the dehumidifying priority automatic operation mode is limited to be lower than the maximum value of the air conditioning capacity in the manual operation mode, the same effect as that of the first aspect can be obtained.

An air conditioner according to a third aspect is configured such that the rotation speed of the compressor is varied by an inverter circuit.
By limiting the maximum rotation speed of the compressor during the heating operation selected in the dehumidifying priority automatic operation mode to be lower than the maximum rotation speed of the compressor during the heating operation selected manually,
Since the maximum value of the air-conditioning capacity in the dehumidifying priority automatic operation mode is limited to be lower than the maximum value of the air-conditioning capacity in the manual operation mode, the same effect as the first aspect can be obtained.

The air conditioner according to a fourth aspect of the present invention provides a manual operation mode for manually selecting one of a heating operation and a cooling operation, and a heating operation and a cooling operation mode based on a detection value of a room temperature sensor. It is possible to switch to the dehumidification priority automatic operation mode, which automatically selects one of the ventilation operation mode and the dehumidification operation mode, and to operate, and to set the maximum value of the air conditioning capacity of the dehumidification priority automatic operation mode to the manual operation mode. Since the operation is performed with the air-conditioning capacity restricted to be lower than the maximum value of the air conditioning capacity, the same effect as that of the first aspect can be obtained, and at the same time, various controls can be performed according to changes in the situation.

The air conditioner according to the present invention is capable of operating in a dehumidification priority automatic operation mode in which one of a heating operation and a dehumidification operation mode is automatically selected based on a detection value of a room temperature sensor, and By controlling the wind direction change plate so that the air blowing direction of the indoor unit in the heating operation is almost horizontal, warm air is not blown downward at low temperature and high humidity, preventing discomfort caused by downward warm air. can do.

According to a sixth aspect of the present invention, the air conditioner automatically selects any one of a heating operation, a cooling operation mode, a ventilation operation mode, and a dehumidification operation mode based on a detection value of a room temperature sensor. In addition to enabling operation in the operation mode, the wind direction change plate is controlled to be almost horizontal regardless of the operation state, so that even when the operation state changes variously, the air discharged from the indoor unit is directly downward. , And it becomes difficult for the hot air to hit the occupants. Therefore, it is possible to prevent discomfort caused by the hot air at low temperature and high humidity.

An air conditioner according to a seventh aspect of the present invention uses an indoor unit having an air inlet above and an air outlet below, and a tip of the wind direction changing plate at the time of heating operation and cooling operation. The position of the wind direction changing plate is set slightly higher than the horizontal line, and the tip of the wind direction change plate is further turned upward during the dehumidifying operation than during the heating operation and the cooling operation. Sometimes, the warm air does not reach the occupants, and the effect of preventing the discomfort caused by the warm air and the effect of preventing the discomfort caused by the cool air can be further enhanced.

The air conditioner according to the present invention is capable of operating in a dehumidifying priority automatic operation mode in which any one of a heating operation, a cooling operation and a dehumidification operation is automatically selected based on a detection value of a room temperature sensor. And, during the heating operation, the wind direction change plate is controlled to be substantially horizontal, and when the detection value of the room temperature sensor during the cooling operation is equal to or more than a predetermined value, the tip of the wind direction change plate is positioned slightly below the horizontal line, and is less than the predetermined value. In this case, since the tip of the wind direction change plate is positioned horizontally or slightly above the horizontal line, even if the cold air hits the occupant in a state where the cooling operation is performed at a high room temperature, it does not cause discomfort due to the cold air. Also, when the temperature rises, the cold air hardly hits the occupants, so that the discomfort caused by the warm air and the discomfort caused by the cold air can be prevented.

In the air conditioner according to the ninth aspect, when the heating operation is selected in the manual operation mode, the amount of the blown air is reduced when the blown air temperature is lower than a predetermined value. During the heating mode operation, the operation of reducing the amount of blown air is prohibited or relaxed, so that the warm air blowout accompanying the cool air blowout prevention control is eliminated, and discomfort due to warm air can be prevented.

According to a tenth aspect of the present invention, in the air conditioner, the indoor unit includes an indoor fan having a variable number of revolutions and a blown air temperature sensor for detecting a temperature of air blown from the indoor unit. When the detected temperature value is equal to or less than the predetermined value, the number of rotations of the indoor fan is reduced, so that the effect of preventing discomfort caused by the cool air can be enhanced.

In the air conditioner according to the eleventh aspect, when the temperature detected by the indoor heat exchanger temperature sensor is equal to or less than a predetermined value, the number of revolutions of the indoor fan is reduced, so that the effect of preventing discomfort caused by cold air is prevented. Can be increased.

In the air conditioner according to the twelfth aspect, when the temperature detected by the indoor heat exchanger temperature sensor is equal to or less than the first set value, the indoor fan is stopped, and the heating operation is performed during the heating operation in the dehumidifying priority automatic operation mode. When the temperature detected by the indoor heat exchanger temperature sensor is lower than the first set value, the indoor fan is stopped, so that the effect of preventing discomfort caused by the cool air can be further enhanced.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on preferred embodiments. FIG. 2 is a sectional view of the indoor unit constituting one embodiment of the present invention. In the figure,
The indoor unit 1 has a suction port 2 for indoor air on the front surface, a suction port 3 for indoor air on the upper surface, and blows air for air conditioning (cooling air, dehumidification air, heating air, etc.) on a lower front surface. It has an outlet 4.

In the indoor unit 1, the suction ports 2, 3
To the outlet 4 to form a ventilation path 5. In the ventilation path 5, a dustproof (and deodorizing) filter 6 is provided inside the suction ports 2 and 3, and a main indoor heat exchanger 8 and an auxiliary indoor heat exchanger 7 are arranged inside the filter 6. Is established. Then, a cross flow type indoor fan 9 is provided inside the two heat exchangers 7.8.

The main indoor heat exchanger 8 is divided into two and arranged in an inverted V shape so as to surround the indoor fan 9. A part of the heat exchanger 8 faces the suction port 2 on the front face, and another part faces the suction port 3 on the upper face. And between the heat exchanger suction port 3,
That is, the auxiliary indoor heat exchanger 7 is disposed at a position on the windward side above the heat exchanger 8 in the indoor air suction flow path. A drain receiving portion 19a, 1 is provided below the heat exchanger 8.
9b is formed.

When the indoor fan 9 rotates, the indoor air is sucked into the indoor unit 1 through the suction port 2 and the suction port 3, respectively. The suction air from the suction port 2 passes through the filter 6 and further flows through the heat exchanger 8 to the indoor fan 9 side. After passing through the filter 6, the suction air from the suction port 3 first passes through the auxiliary indoor heat exchanger 7, and then flows through the heat exchanger 8 toward the indoor fan 9.

In the ventilation path 5, a left and right wind direction change plate 10 is provided at a position facing the outlet 4 on the downstream side of the indoor fan 9. The left and right wind direction change plates 10 are for setting the direction of the blown wind in the left and right direction of the indoor unit 1 and are motor driven.

A plurality of, for example, a pair of upper and lower wind direction change plates 11, 11 are provided vertically below the left and right wind direction change plates 10. The upper and lower wind direction change plates (hereinafter, also simply referred to as “wind direction change plates”) 11 and 11 are driven by a single motor in conjunction with each other, and rotate counterclockwise on the drawing to rotate at the time of operation. , The direction of the blowing wind is set in the vertical direction of the indoor unit 1, and when the operation is stopped, the blower is turned clockwise to close the air outlet 4, thereby preventing dust from entering the indoor unit 1. Work.

FIG. 1 is a system diagram showing the configuration of a control system including the indoor unit 1 together with a refrigerant system. In the figure, an outdoor heat exchanger 23 is connected to the discharge side of a compressor 21 via a four-way valve 22 by piping.
, An expansion mechanism, for example, an electric expansion valve 24 is connected by piping. The degree of opening of the electric expansion valve 24 continuously changes in accordance with the number of input drive pulses.

One end of the auxiliary indoor heat exchanger 7 is connected to the motor-operated expansion valve 24 by piping, and the other end of the auxiliary indoor heat exchanger 7 is connected to the indoor heat exchanger 8 by piping. The suction port of the compressor 21 is connected to the main indoor heat exchanger 8 via the four-way valve 22 by piping.

Thus, a heat pump refrigeration cycle capable of cooling, dehumidifying, and heating is configured.

At the time of cooling, the refrigerant discharged from the compressor 21 flows from the four-way valve 22 to the outdoor heat exchanger 23, the electric expansion valve 24, the auxiliary indoor heat exchanger 7, and the main indoor heat exchanger, as indicated by solid arrows in the drawing. A cooling cycle is formed in which the refrigerant flows sequentially to the heat exchanger 8 and passes through the main indoor heat exchanger 8 and returns to the compressor 21 through the four-way valve 22. That is, the outdoor heat exchanger 23 functions as a condenser, and the auxiliary indoor heat exchanger 7 and the main indoor heat exchanger 8 function as an evaporator.

At the time of dehumidification, a dehumidification cycle in which the refrigerant flows in the same direction as during cooling is formed. The dehumidification cycle is performed so that the difference between the temperature of the auxiliary indoor heat exchanger 7 and the temperature of the main indoor heat exchanger 8 becomes a predetermined value, and the temperature of the auxiliary indoor heat exchanger 7 becomes equal to or lower than the dew point temperature. A short circuit is formed so that the air blown out from the air outlet 4 flows through the air inlet 2 as it is, and the wind direction change plates 11, 11 are controlled so that the blown air does not reach the living area. The angle and the speed of the indoor fan 9 are controlled.

During heating, the four-way valve 22 is switched so that the refrigerant discharged from the compressor 21 flows from the four-way valve 22 into the main indoor heat exchanger 8 and the auxiliary indoor heat exchanger Then, a cycle is formed in which the refrigerant sequentially flows to the electric expansion valve 24 and the outdoor heat exchanger 23 and passes through the outdoor heat exchanger 23 and returns to the compressor 21 through the four-way valve 22. That is, the auxiliary indoor heat exchanger 7 and the main indoor heat exchanger 8 function as a condenser, and the outdoor heat exchanger 23 functions as an evaporator.

As shown in both FIG. 1 and FIG. 2, a heat exchanger temperature sensor 13 is attached to a heat exchange pipe on the outlet side of the auxiliary indoor heat exchanger 7, and heat in an intermediate portion of the main indoor heat exchanger 8. A heat exchanger temperature sensor 14 is attached to the exchange pipe.

A room temperature sensor 15 is provided in a room air suction passage extending from the suction port 2 to the main indoor heat exchanger 8. Further, an outdoor fan 25 is provided near the outdoor heat exchanger 23. The outdoor fan 25 supplies outdoor air to the outdoor heat exchanger 23.

The commercial AC power supply 30 has an inverter circuit 3
1. The speed control circuits 32 and 33 and the control unit 40 are connected. Then, the control unit 40 includes an inverter circuit 31,
The speed control circuits 32 and 33, the wind direction changing plate motors 10M (not shown) and 11M, the heat exchanger temperature sensor 14, the indoor temperature sensor 15, the four-way valve 22, the electric expansion valve 24, and the light receiving unit 41 are connected.

The inverter circuit 31 rectifies the power supply voltage, converts the power supply voltage into an alternating current having a frequency (and voltage) according to a command from the control unit 40, and outputs the alternating current. This output is supplied to the compressor 21
Of the drive motor (compressor motor). Therefore, the rotation speed of the compressor 21 changes according to the output frequency of the inverter circuit 31.

The speed control circuit 32 controls the outdoor fan motor 2
By controlling the supply of the power supply voltage to 5M (for example, energizing phase control), the speed of the outdoor fan motor 25M (the amount of air blown by the outdoor fan 25) is set to a speed according to a command from the control unit 40. The speed control circuit 33 sets the supply control of the power supply voltage to the indoor fan motor 9 </ b> M (the amount of air blown by the indoor fan 9) to a speed according to a command from the control unit 40.

The light receiving portion 41 receives infrared light transmitted from a remote control type operation device (hereinafter, abbreviated as a remote control device) 42. The control unit 40 controls the entire air conditioner, and has the following main functions (a) to (l). (A) a manual operation mode for manually selecting a heating operation;
Based on the detection value of the room temperature sensor, it is possible to switch to the dehumidifying priority automatic operation mode in which one of the heating operation and the dehumidifying operation is automatically selected and to operate, and to perform the heating operation in the dehumidifying priority automatic operation mode. The air conditioner is operated with the air conditioning capacity limited to be lower than the air conditioning capacity during the heating operation in the manual operation mode. (B) In both the heating operation selected in the manual operation mode and the heating operation automatically selected in the dehumidification priority automatic operation mode, the air conditioning capacity of the compressor is varied in the range between the maximum value and the minimum value, The maximum value of the air conditioning capacity in the dehumidifying priority automatic operation mode is limited to be lower than the maximum value of the air conditioning capacity in the manual operation mode. (C) By limiting the maximum rotation speed of the compressor in the heating operation selected in the dehumidification priority automatic operation mode to be lower than the maximum rotation speed of the compressor in the heating operation selected manually, dehumidification priority automatic operation. The maximum value of the air conditioning capacity in the mode is limited to be lower than the maximum value of the air conditioning capacity in the manual operation mode. (D) a manual operation mode for manually selecting one of a heating operation and a cooling operation, and one of a heating operation, a cooling operation mode, a ventilation operation mode, and a dehumidification operation mode based on a detection value of a room temperature sensor. It is possible to operate by switching to the dehumidifying priority automatic operation mode in which one is automatically selected, and restrict the maximum value of the air conditioning capacity in the dehumidifying priority automatic operation mode to be lower than the maximum value of the air conditioning capacity in the manual operation mode. Drive. (E) The operation in the dehumidifying priority automatic operation mode in which one of the heating operation and the dehumidification operation mode is automatically selected based on the detection value of the room temperature sensor is possible, and the air blowing direction of the indoor unit in the heating operation. The wind direction change plate is controlled so that is substantially horizontal. (F) an operation in a dehumidifying priority automatic operation mode in which any one of a heating operation mode, a cooling operation mode, a ventilation operation mode, and a dehumidification operation mode is automatically selected based on a detection value of a room temperature sensor, and The wind direction changing plate of the indoor unit is controlled substantially horizontally regardless of the operation state. (G) The tip of the wind direction changing plate is positioned slightly upward from the horizontal line during the heating operation, and the tip of the wind direction changing plate is further oriented upward during the dehumidifying operation. (H) An operation in a dehumidification priority automatic operation mode in which any one of a heating operation, a cooling operation and a dehumidification operation is automatically selected based on a detection value of a room temperature sensor is possible, and the wind direction changing plate is horizontally moved during the heating operation. Or control slightly upward from horizontal,
When the detection value of the room temperature sensor during the cooling operation is equal to or more than a predetermined value, the tip of the wind direction changing plate is positioned slightly downward from the horizontal, and when the detected value is less than the predetermined value, the tip of the wind direction changing plate is horizontal or slightly upward from the horizontal. Position. (I) When the heating operation is selected in the manual operation mode,
When the temperature of the blown air is lower than a predetermined value, the blown air amount is reduced, and the operation of reducing the blown air amount is prohibited or relaxed during the heating mode operation in the dehumidifying priority automatic operation mode. (J) When the temperature detected by the indoor heat exchanger temperature sensor is equal to or less than a predetermined value, the rotation speed of the indoor fan is reduced. (K) Instead of the indoor heat exchanger temperature sensor, a blown air temperature sensor that detects the temperature of air blown from the indoor unit is used. (L) During the heating operation selected in the manual operation mode, if the temperature detected by the indoor heat exchanger temperature sensor is equal to or less than the first set value, the indoor fan is stopped, and the heating operation in the dehumidifying priority automatic operation mode is performed. Sometimes, when the temperature detected by the indoor heat exchanger temperature sensor is lower than a second set value lower than the first set value, the indoor fan is stopped.

Regarding the operation of the present embodiment configured as described above, according to the flowcharts of FIGS. 3 to 11 showing the processing procedures of the microcomputer constituting the control unit 40, also refer to the explanatory diagrams of FIGS. 12 to 15. This will be described below. In the present embodiment, the remote control device 42
In addition to the manual operation mode setting, it is possible to select a dehumidifying priority automatic operation mode in which the operation mode is automatically selected by giving priority to the dehumidifying operation. In this case, of the various operation modes m (n), the operation in which the manual ventilation operation mode is set to n = 0, the heating operation mode is set to n = 1, and the cooling operation mode is set to n = 2, and the operation is automatically selected with priority given to dehumidification. Mode m
In (n), the dehumidifying operation mode is n = 3, the blowing operation mode is n = 4, the heating operation mode is n = 5, the heating operation mode is n = 6, and the rotation speed of the compressor 21 is set according to these operation modes. The air volume of the indoor fan 9 (corresponding to the speed of the fan motor), the angle of the vertical wind direction changing plate (louver) 11, and the like are set to predetermined values. In particular, a manual operation mode is also referred to as a normal operation mode in contrast to the dehumidification priority automatic operation mode.

First, the microcomputer constituting the control unit 40 determines whether or not an operation start command has been transmitted from the remote control device 42 to the light receiving unit 41 (see FIG. 1) in the first step 101 after the power is turned on. If it has been transmitted, in step 102, it is determined whether or not the manual heating operation mode has been set.
At 103, the normal heating mode m (1) is stored.

If it is determined in step 102 that the manual heating operation mode is not set,
At 104, it is determined whether the dehumidifying priority automatic operation mode has been set. If it is determined that the operation mode is not the dehumidification priority automatic operation mode, the process proceeds to step 105, and it is further determined whether the cooling operation mode by manual setting is set. Then, the normal cooling mode m (2) is stored. If not in the cooling operation mode, it is determined to be the air blowing mode, and in step 107, the air blowing mode m (0) is stored.

Next, if it is determined in the first step 101 that the operation start command has not been transmitted, it is checked in step 108 whether or not the vehicle is currently operating. If the operation is stopped, it is further determined in step 109 whether or not an operation stop signal is received. If the operation stop signal is received, stop processing is performed in step 119, that is, the vertical wind direction shown in FIG. The air outlet 4 is closed by the change plate 11 to prevent dust from entering the interior of the indoor unit 1. Then, when the stop processing is completed, or when it is determined in step 108 that the vehicle is not driving, a standby state is set in step 111.

If the operation stop signal is not received in step 109, the operation mode at that time becomes a problem. In step 112, it is determined whether the value of n indicating the operation mode m is larger than 2. If n> 2, it is determined that the automatic operation mode is the dehumidifying priority automatic operation mode.
A set temperature determination process of 0 is executed, and when n ≦ 2, the process proceeds to an operation speed determination process of the compressor 21 shown in FIG.

Next, if it is determined in step 104 that the automatic operation mode is the dehumidifying priority automatic operation mode, the indoor fan motor 9 (FIG. 2) is driven in step 113. Then, in step 114, a timer for measuring the operation time is used. Start t1. Then, in the next step 200, a process of determining a set room temperature Tsc, which will be described in detail later with reference to FIGS. When the set room temperature Tsc is determined, the current room temperature Ta is read in step 115. Further, in step 116, the difference between the detected room temperature Ta and the set room temperature Tsc is calculated according to the difference ΔTa = Ta−Tsc.
In FIG. 12, the operation mode is determined. If the operation mode is dehumidifying heating, the operation mode m (5) is stored in step 118. If the operation mode is dehumidification, the operation mode m (5) is stored in step 119.
If (3) is stored, the operation mode m (6) is stored in step 120 for dehumidification cooling, and the operation mode m (4) is stored in step 121 for dehumidification ventilation.

FIG. 12 shows the operation mode according to the difference ΔTa = Ta−Tsc between the detected room temperature Ta and the set room temperature Tsc.
That is, one of the cooling cycle, the dehumidification cycle, the ventilation cycle, and the heating cycle is determined, and each operation mode is determined by providing a hysteresis when the temperature difference is decreasing and when it is increasing. doing. FIG. 12 also shows the number of revolutions of the compressor 21, the amount of air flow from the indoor fan, and the wind direction of the vertical wind direction change plate (louver) 11, and FIG.
This will be described with reference to FIGS.

FIG. 4 shows a process for determining the output frequency to be output by the inverter circuit 31, that is, the compressor speed. In step 131, the current room temperature Ta is read. In step 132, the detected room temperature Ta is read. ΔTa = Ta−Tsc, which is the difference between the calculated value and the set room temperature Tsc.
In FIG. 3, the operation mode m stored by the processing shown in FIG.
(N) is determined, and the result of the determination is the operation mode m of the manual ventilation.
If (0) or the dehumidifying priority cooling mode m (6), the compressor is kept stopped in step 134, and if the heating mode m (1) or the cooling mode m (2) is manually set, in step 135, According to the magnitude of the temperature difference ΔTa at that time, the compressor rotation speed rps is determined according to the relationship chart of the normal operation mode shown in FIG. 13, and further, the dehumidification mode m (3) of the dehumidification priority automatic operation and the blowing mode m (4) ) Or heating mode m (5), in step 136,
In accordance with the magnitude of the temperature difference ΔTa at that time, the compressor rotational speed rps is determined according to the relationship chart of the dehumidifying priority automatic operation mode shown in FIG.

As is clear from the relationship chart of the processing procedure shown in FIG. 4 and the dehumidifying priority automatic operation mode shown in FIG. 12 and the relationship chart of the normal operation mode shown in FIG. The compressor rotation speed during the heating operation is significantly lower than the compressor rotation speed during the heating operation in the manual operation mode.Therefore, the air conditioning capacity during the heating operation in the dehumidifying priority automatic operation mode is reduced during the heating operation in the manual operation mode. Of the air conditioner is controlled to be lower than the air conditioning capacity of the air conditioner.

In both the heating operation selected in the manual operation mode and the heating operation automatically selected in the dehumidifying priority automatic operation mode, the compressor speed is set between the maximum value and the minimum value (stop). In addition to the variable control, it is possible to perform the control in which the maximum value (28 rps) of the compressor speed in the dehumidifying priority automatic operation mode is lower than the maximum value (100 rps) of the compressor speed in the manual operation mode. Therefore, control is performed such that the maximum value of the air conditioning capacity in the dehumidifying priority automatic operation mode is limited to be lower than the maximum value of the air conditioning capacity in the manual operation mode.

FIG. 5 shows a processing procedure for determining the direction of the vertical wind direction change plate 11 in accordance with the operation mode determined as described above. In step 141, the operation mode m (n) is determined, and In the operation mode m (0) or the cooling operation mode m (2), in step 142, the vertical wind direction change plate 11 is fixed horizontally, and the heating operation mode m is manually operated.
If (1), in step 143, the vertical wind direction changing plate 11 is fixed obliquely downward, and the dehumidifying mode m of the dehumidifying priority automatic operation is set.
In the case of (3), in step 144, the vertical wind direction changing plate 11
Slightly above or above the horizontal to increase short circuit tendencies. In addition, the ventilation mode m (4) of the dehumidifying priority automatic operation,
In any of the heating modes m (5), step 14
5, the vertical direction change plate 11 is set to be horizontal or slightly upward from horizontal, and the cooling mode m (6) of the automatic operation with priority on dehumidification.
In step 146, the room temperature Ta is read in, and in step 147, it is determined whether the room temperature Ta is higher than a preset temperature Tfs (for example, 18 ° C.), and it is determined that the room temperature Ta is higher than the set temperature Tfs. For example, in step 148, the vertical wind direction changing plate 11 is fixed slightly downward from horizontal, and if it is determined that the room temperature Ta is not higher than the set temperature Tfs, the vertical wind direction changing plate 11 is horizontally or A process of slightly upward from horizontal is executed.

FIG. 14 shows the position and range of the vertical wind direction change plate in the dehumidifying priority automatic operation mode in the processing procedure shown in FIG. That is, at the time of the dehumidifying operation m (3), as shown in FIG. 7A, in order to increase the tendency of the short circuit, the upward angle α (> slightly above horizontal)
Be adjusted to the range of β), m (4) during air blowing operation or m (5) during heating operation or m during cooling operation when room temperature is low
In (6), as shown in FIG. (B), the angle is adjusted to a range of an angle β that is horizontal or slightly upward from horizontal, and during cooling operation m (6) at a high room temperature, it is shown in FIG. Is fixed at an angle β slightly downward from the horizontal.

As is clear from these descriptions, it is possible to control the indoor unit to blow out the air in a substantially horizontal direction in the heating operation in the dehumidifying priority automatic operation mode to form a short circuit.

When the three directions slightly upward from the horizontal, horizontal, and slightly downward from the horizontal are considered to be substantially horizontal, the control to make the horizontal substantially in any one of the dehumidifying priority automatic operation modes, The effect combined with the simplification of the configuration can be expected.

Further, at the time of dehumidification in the dehumidification priority automatic operation mode, it is possible to control the tip to be positioned more upward than in the heating operation.

Further, during the cooling operation in the dehumidifying priority automatic operation mode, when the detected value of the room temperature sensor is equal to or smaller than a predetermined value, the tip of the wind direction change plate is positioned slightly below the horizontal line, and the detected value of the room temperature sensor is changed to the predetermined value. When the value is equal to or more than the value, the wind direction change plate can be controlled to be horizontal or slightly upward from horizontal.

FIG. 6 shows a processing procedure for controlling the speed of the indoor fan motor 9M, that is, the air flow rate of the indoor fan 9, in accordance with the operation mode determined as described above. The temperature Tc is read from the output of the sensor 14, and the operation mode m (n) stored in the next step 152 is determined. As a result of this determination, if it is the air blowing operation mode m (0) by manual setting, the air volume F is set to the weak wind L in step 153, and if it is the manual cooling operation mode m (2) in FIG.
As shown in FIG. 3, the air volume F is determined to be any of the strong wind M, the weak wind L, and the light wind UL according to the temperature difference ΔTa. On the other hand, in the case of the heating mode m (1) by manual setting, the step
As shown in FIG. 13 at 155, the air volume F is set to any of zero off, the micro wind SUL, the micro wind UL, the light wind L, and the strong wind M according to the temperature difference ΔTa. It is determined whether the temperature Tc exceeds 35 ° C., and if it does not exceed 35 ° C., in step 157, the air volume F is set to zero off. Conversely, if the temperature exceeds 35 ° C,
At 158, it is determined whether or not the indoor heat exchanger temperature Tc exceeds 45 ° C., and if so, at step 165, the rotation speed of the indoor fan motor 9M is controlled in accordance with the determined air volume. Indoor heat exchanger temperature Tc is 4
If the temperature does not exceed 5 ° C., it is determined whether or not the set air volume at that time is larger than the ultra-small wind SUL. If so, in step 165, the rotation speed of the indoor fan motor 9M is directly controlled according to the determined air volume. Next, the dehumidification mode m (3), the ventilation mode m (4), and the heating mode m of the dehumidification priority automatic operation
(5) In the case of the cooling mode m (6), as shown in FIG.
Is set to one of the super-breeze SUL, the breeze UL, and the weak breeze L, and the processing of step 165 is executed. In the process illustrated in FIG. 6, even if the indoor heat exchanger temperature Tc is lower than the room temperature Ta, the heating mode m by the manual setting is used.
The case where the restriction on the prevention of blowing out the cold air, which is performed in the case of (1), is not performed is shown.

If the heating mode m of the dehumidifying priority automatic operation is used,
In (5), the condition for preventing cold air blowing is changed to the heating mode m.
As shown in FIG. 7, in the case of performing the operation more relaxedly than in the case of (1), in the case of the dehumidification mode m (3), the ventilation mode m (4), and the cooling mode m (6) of the dehumidification priority automatic operation. In the heating mode m (5) of the dehumidifying-priority automatic operation, the process of step 161 is executed.
As shown in FIG. 2, the air volume F is set to one of the ultra-breeze SUL, the breeze UL, and the weak breeze L according to the temperature difference ΔTa, and then the indoor heat exchanger temperature Tc is reduced to the room temperature Ta (≦ 35 ° C.). It is determined whether or not the flow rate exceeds the threshold value. If the flow rate exceeds the threshold value, the process proceeds to step 165. If not, the air volume F is set to zero off, and the process flow proceeds to the process at step 165.

Thus, as is clear from the processing charts shown in FIGS. 6 and 7 and the relation chart of the dehumidifying priority automatic operation mode shown in FIG. 12 and the relation chart of the normal operation mode shown in FIG. When the heating operation is selected in the mode, the blowing air amount is reduced when the blowing air temperature is lower than a predetermined value, and the operation of reducing the blowing air amount is prohibited or eased during the heating mode operation in the dehumidifying priority automatic operation mode. be able to.

During the heating operation selected in the manual operation mode, when the temperature detected by the indoor heat exchanger temperature sensor is equal to or less than the first set value, the indoor fan is stopped, and in the dehumidifying priority automatic operation mode. During the heating operation, when the temperature detected by the indoor heat exchanger temperature sensor is lower than a second set value that is smaller than the first set value, control to stop the indoor fan is performed.

By the way, the set temperature determining process in step 200 shown in FIG. 3 determines the room temperature set value according to the current room temperature, and sets the room temperature set value when the user feels hot or cold. Is executed in response to the output of the correction command for. 8 to 1
1 shows an example of the processing.

FIG. 8 shows a standard method of determining a set temperature according to the present embodiment. Basically, the set temperature is set to the room temperature at the start of the operation. Therefore, the room temperature set value is determined at a stage after a predetermined time has elapsed from the operation in consideration of a lack of appropriateness. That is, in step 211, the process waits until the value of the timer t1 started in step 114 of FIG. 3 has exceeded one minute. During this time, the indoor fan 9M has already been turned on in step 113, so that the heat is removed.
Average room temperature detection is possible. And step 222
Confirms that exactly one minute has elapsed, and reads the room temperature Ta in step 213, and sets the room temperature Ta as the initial room temperature Tao at the start of operation. In the subsequent step 215,
It is checked whether or not the set temperature adjustment signal ΔTs has been received from Step 2. If it has been received, the value ΔTs,
For example, 3 ° C. is directly determined as the correction value ΔTs, and subsequently, in step 217, the correction value ΔT
Correction by s, that is, the processing of Tsc = Tao + ΔTs is executed to determine the room temperature set value Tsc. Here, after a lapse of one minute from the start of operation, the processing of steps 213 and 214 is omitted, and the room temperature set value Tsc is changed only by a command from the remote controller 42.

By executing the processing shown in FIG. 8, it is possible to avoid an erroneous setting due to a heat trap which is likely to occur when the operation is restarted despite a short time after the previous operation. can do.

FIG. 9 shows another standard method for determining the set temperature of the present embodiment.
If the detected temperature at the time of a so-called short circuit is determined to be the room temperature set value, the air from the air outlet 4 of the air outlet 4 of FIG. Therefore, after 25 minutes have elapsed, the set value is set to the room temperature at that time as a reference value of the set temperature. For this purpose, in step 221, a process of waiting until the value of the timer t1 elapses 1 minute is executed. In step 222, it is confirmed that 1 minute has elapsed. In the next step 233, the initial room temperature Tao is read. In step 224, it is checked whether or not the set temperature adjustment signal ΔTs has been received from the remote control device 42. If so, the value ΔTs received in step 225 is determined as it is as a correction value. Correction of room temperature Tao by correction value ΔTs, that is, Tsc = Tao
The process of + ΔTs is executed to determine the room temperature set value Tsc.
On the other hand, after one minute has elapsed from the start of operation, step 227
Check if 25 minutes have passed since the start of the operation.
At the time when 5 minutes have elapsed, the room temperature Ta at that time is read in step 228, and in step 229, the room temperature Ta is set as the initial room temperature Tao, and the processing from step 224 onward is executed.

As a result, even in the short circuit operating state, the set room temperature can be changed to an appropriate value thereafter.

In the processes shown in FIGS. 8 and 9, the room temperature at one minute from the start of operation or the room temperature at 25 minutes has been set as the room temperature set value. Requests that the set temperature be changed because the room temperature at that time does not meet the user's wishes. Therefore, if there is a request to change the set temperature, the temperature at that time is set to the reference value. It is appropriate to use Tao.

FIG. 10 shows a part of the processing procedure focusing on this point. After receiving the set temperature adjustment signal in step 215 in FIG. 8 or step 224 in FIG. At step 232, the current room temperature Ta is read, and at step 233, the room temperature Ta is determined as the initial room temperature Tao. At step 234, the correction value for the initial room temperature Tao is determined. Correction by ΔTs, ie, Tsc = Tao + ΔTs
Is performed to determine the room temperature set value Tsc.

On the other hand, in the above-described method for determining the set room temperature, since the room temperature Ta is used as a reference, if the room temperature at the start of operation is high or low, it is possible to reach an extremely high or low temperature state by the subsequent operation. There is. FIG.
Shows a processing procedure added after executing the processing of Tsc = Tao + ΔTs in order to deal with this. That is, after the processing of step 217 shown in FIG. 8 or step 226 shown in FIG. 9 or step 234 shown in FIG.
At step 241, it is determined whether or not the initial room temperature Tao exceeds 28 ° C. If it does, the process of Tsc = 28 + ΔTs is executed, and if it does not, the correction is not performed. Next, it is determined in step 243 whether or not the initial room temperature Tao is lower than 15 ° C.
The process of sc = 15 + ΔTs is executed, and if not less, the process is terminated without performing the correction. As a result, the reference value of the set room temperature can be limited between 28 ° C. and 15 ° C.

Although the above described correction value ΔTs is described as an example of 3 ° C., this correction value ΔTs
Thus, the size and increase / decrease can be arbitrarily set. FIG. 15 is an explanatory diagram for explaining this, and the display screen 43 indicates “dry” in the dehumidifying priority automatic operation mode. If the correction value ΔTs is not transmitted, the temperature is not displayed on the display screen 43 as shown in FIG. On the other hand, when correcting the room temperature to be higher, for example, by pressing the button 44 for raising the room temperature twice in succession, the display screen 43 displays the correction value of 2 ° C. together with the symbol. Is done.
Conversely, when the room temperature is corrected to a low level, for example, if the button 45 for lowering the room temperature is pressed three times in succession, the display screen 4
3 indicates that the correction value is 3 ° C., together with a symbol for downward correction. That is, each time the room temperature rise button 44 is pressed once, the correction value displayed on the display screen 43 can be raised by 1 ° C. Conversely, each time the room temperature decrease button 45 is pressed once, the display screen 43 is raised. Can be reduced by 1 ° C.

In the above-described embodiment, in the dehumidification priority automatic operation mode, any one of cooling, dehumidification, ventilation, and heating is selected based on the difference ΔTa between the room temperature and the set temperature. Heating is not performed in a normal operation mode heating prohibited zone in which heating is not performed when the cooling load is large, or in a normal operation mode cooling prohibited zone in which cooling is not performed when the outside air temperature is low and the heating load is large. In this case, a configuration may be adopted in which an air blowing mode is selected instead of each operation state of cooling.

Further, according to the above embodiment, the air flow set value is changed by the indoor heat exchanger temperature sensor. However, instead of the indoor heat exchanger temperature sensor, the air blown from the indoor unit is changed. Even if a blow-off air temperature sensor for detecting the temperature is used, substantially the same control as described above can be performed.

[0068]

According to the first aspect of the present invention, the air conditioner is operated with the air conditioning capacity in the heating operation in the dehumidifying priority automatic operation mode limited to be lower than the air conditioning capacity in the heating operation in the manual operation mode. By switching between heating operation and dehumidification operation in the dehumidification priority automatic operation mode, dehumidification operation in low-temperature and high-humidity state becomes possible. Discomfort can be prevented.

In the air conditioner according to the present invention, the air conditioning capacity of the compressor can be varied between a maximum value and a minimum value, and the maximum value of the air conditioning capacity in the dehumidifying priority automatic operation mode can be changed in the manual operation mode. Since the limit is lower than the maximum value of
The same effect as the first aspect is obtained.

According to a third aspect of the present invention, the air conditioner has a configuration in which the rotation speed of the compressor is varied by an inverter circuit.
By limiting the maximum rotation speed to be lower than the maximum rotation speed of the compressor in the heating operation that is manually selected, the maximum value of the air conditioning capacity in the dehumidifying priority automatic operation mode is set to be larger than the maximum value of the air conditioning capacity in the manual operation mode. Therefore, the same effect as in claim 1 can be obtained.

In the air conditioner according to the fourth aspect, any one of the heating operation, the cooling operation, the air blowing operation and the dehumidification operation is selected in the dehumidification priority automatic operation mode, so that the same effect as the first aspect is obtained. At the same time, various controls can be performed according to changes in the situation.

In the air conditioner according to the fifth aspect, since the air direction changing plate is controlled so that the air blowing direction of the indoor unit in the heating operation is substantially horizontal, the warm air is blown downward at the time of low temperature and high humidity. As a result, discomfort due to downward warm air can be prevented.

In the air conditioner according to the sixth aspect, the wind direction change plate is controlled to be substantially horizontal regardless of the operation state in the dehumidifying priority automatic operation mode, so that the hot air hardly hits the occupants. There is an effect that control is simplified.

In the air conditioner according to the seventh aspect of the present invention, the short-circuit of the hot air can be provided by setting the tip of the wind direction changing plate further upward during the dehumidifying operation than in the heating operation and the cooling operation. In addition to increasing the ratio, the warm air does not reach the occupant during the dehumidifying operation, so that the effect of preventing discomfort caused by warm air and the effect of preventing discomfort caused by cool air can be further enhanced.

In the air conditioner of the present invention, the wind direction changing plate is controlled to be substantially horizontal during the heating operation, and when the detected value of the room temperature sensor is equal to or more than the predetermined value during the cooling operation, the tip of the wind direction changing plate is set to the horizontal line. Because the tip of the wind direction change plate is positioned slightly lower than a predetermined value, and the tip of the wind direction change plate is positioned slightly above the horizontal or horizontal line when the cooling operation is performed, even if the cold air hits the occupant in a high room temperature state. Without causing discomfort due to cold air, when the temperature becomes higher than this, it is difficult for the cold air to hit the occupants, so that discomfort due to warm air and prevention of discomfort due to cold air can be prevented.

In the air conditioner according to the ninth aspect, when the heating operation is selected in the manual mode, the amount of the blown air is reduced when the blown air temperature is lower than a predetermined value. During the heating mode operation, the operation of reducing the amount of blown air is prohibited or relaxed, so that the hot air blowout accompanying the cold air blowout prevention control is eliminated, and discomfort due to the warm air can be prevented.

In the air conditioner according to the tenth aspect, when the temperature detected by the blown air temperature sensor is equal to or less than a predetermined value, the number of revolutions of the indoor fan is reduced, so that the effect of preventing discomfort caused by the cool air is enhanced. be able to.

In the air conditioner according to the eleventh aspect, when the temperature detected by the indoor heat exchanger temperature sensor is equal to or less than a predetermined value, the rotational speed of the indoor fan is reduced.
The same effect can be obtained.

In the air conditioner according to the twelfth aspect, when the temperature detected by the indoor heat exchanger temperature sensor is equal to or less than the first set value during the heating operation in the manual operation mode, the indoor fan is stopped, and dehumidification is performed. During heating operation in priority automatic operation mode,
When the temperature detected by the indoor heat exchanger temperature sensor drops below a second set value lower than the first set value, the indoor fan is stopped, so that the effect of preventing discomfort caused by the cool air is reduced. Can be further enhanced.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a refrigeration cycle and a configuration of a control circuit according to an embodiment of the present invention.

FIG. 2 is a sectional view showing an internal configuration of an indoor unit constituting the embodiment shown in FIG. 1;

FIG. 3 is an exemplary flowchart showing a processing procedure of a microcomputer constituting the control unit of the embodiment shown in FIG. 1;

FIG. 4 is an exemplary flowchart showing the processing procedure of a microcomputer constituting the control unit of the embodiment shown in FIG. 1;

FIG. 5 is a flowchart showing a processing procedure of a microcomputer constituting the control unit of the embodiment shown in FIG. 1;

FIG. 6 is an exemplary flowchart showing the processing procedure of a microcomputer constituting the control unit of the embodiment shown in FIG. 1;

FIG. 7 is an exemplary flowchart showing the processing procedure of a microcomputer constituting the control unit of the embodiment shown in FIG. 1;

FIG. 8 is a flowchart showing a processing procedure of a microcomputer constituting the control unit of the embodiment shown in FIG. 1;

FIG. 9 is a flowchart showing a processing procedure of a microcomputer constituting the control unit of the embodiment shown in FIG. 1;

FIG. 10 is an exemplary flowchart showing the processing procedure of a microcomputer constituting the control unit of the embodiment shown in FIG. 1;

FIG. 11 is an exemplary flowchart showing the processing procedure of a microcomputer constituting the control unit of the embodiment shown in FIG. 1;

FIG. 12 is a diagram illustrating a difference between a room temperature and a set temperature, an operation mode, a compressor rotation speed, an indoor fan air flow rate, and directions of a vertical wind direction change plate in order to explain an operation of the control unit of the embodiment shown in FIG. The figure which shows a relationship.

FIG. 13 is a diagram showing a relationship between a difference between a room temperature and a set temperature, a compressor rotation speed, and an indoor fan air flow rate for explaining an operation of the control unit of the embodiment shown in FIG. 1;

FIG. 14 is an explanatory diagram showing a relationship between an operating state and a vertical wind direction changing plate for explaining the operation of the control unit of the embodiment shown in FIG. 1;

FIG. 15 is a plan view showing a setting state of a remote control device constituting the control unit of the embodiment shown in FIG. 1;

[Description of Signs] 1 Indoor unit 2, 3 Suction port 4 Blow-out port 8 Indoor heat exchanger 9 Indoor fan 11 Vertical air direction change plate 14 Heat exchanger temperature sensor 15 Indoor temperature sensor 21 Compressor 22 Four-way valve 23 Outdoor heat exchanger 24 Electric expansion valve 25 Outdoor fan 31 Inverter circuit 32, 33 Speed control circuit 40 Control unit 42 Controller

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Tetsuji Yamashita 8 Shinsugita-cho, Isogo-ku, Yokohama-shi, Kanagawa Inside the Toshiba Yokohama office

Claims (12)

[Claims] 1. A dehumidifying priority for automatically selecting one of a heating operation and a dehumidifying operation based on a room temperature sensor for detecting a room temperature, a manual operation mode for manually selecting a heating operation, and a detection value of the room temperature sensor. The air conditioner can be switched to the automatic operation mode and operated, and the air conditioning capacity during the heating operation in the dehumidifying priority automatic operation mode is restricted to be lower than the air conditioning capacity during the heating operation in the manual operation mode. An air conditioner comprising: a control unit; 2. The air conditioner according to claim 1, wherein the air conditioner includes a compressor having a variable air conditioning capacity, and the control unit controls the heating operation and the dehumidification selected in the manual operation mode. In any of the heating operations automatically selected in the priority automatic operation mode, while varying the air conditioning capacity of the compressor in a range between a maximum value and a minimum value, the maximum value of the air conditioning capacity in the dehumidification priority automatic operation mode is An air conditioner that varies within a limited range below the maximum value of the air conditioning capacity in the manual operation mode. 3. The air conditioner according to claim 2, wherein the control unit includes an inverter circuit that controls a rotation speed of the compressor, and wherein the heating operation is selected in the dehumidifying priority automatic operation mode. By limiting the maximum rotation speed of the compressor to be lower than the maximum rotation speed of the compressor in the manually selected heating operation, the maximum value of the air-conditioning capacity of the dehumidification priority automatic operation mode is set in the manual operation mode. An air conditioner that limits the air conditioning capacity below the maximum value. 4. A heating operation, a cooling operation, and a blowing operation based on a room temperature sensor for detecting a room temperature, a manual operation mode for manually selecting one of a heating operation and a cooling operation, and a detection value of the room temperature sensor. And the operation can be switched to the dehumidification priority automatic operation mode in which one of the dehumidification operation is automatically selected, and the maximum value of the air conditioning capacity of the dehumidification priority automatic operation mode is set to the air conditioning capacity of the manual operation mode. An air conditioner comprising: a control unit that operates at a limit lower than the maximum value of the air conditioner. 5. A room temperature sensor for detecting a room temperature, a wind direction change plate for changing an air blowing direction of an indoor unit, a manual operation mode for manually selecting a heating operation, and a detection value of the room temperature sensor. It is possible to switch to the dehumidifying priority automatic operation mode in which one of the heating operation and the dehumidifying operation is automatically selected, and to perform the operation, and the air blowing direction of the indoor unit during the heating operation in the dehumidifying priority automatic operation mode. A control unit that controls the wind direction changing plate so as to be substantially horizontal. 6. A room temperature sensor for detecting a room temperature, a wind direction changing plate for changing an air blowing direction of an indoor unit, and a heating operation, a cooling operation, a blowing operation and a dehumidifying operation based on a detection value of the room temperature sensor. An air conditioner comprising: a control unit capable of operating in a dehumidifying priority automatic operation mode in which any one of the operation modes is automatically selected, and controlling the wind direction change plate to be substantially horizontal regardless of an operation state. 7. An indoor unit provided with an air inlet above and an air outlet below the air, a room temperature sensor for detecting room temperature, and heating based on a detection value of the room temperature sensor. Operation in the dehumidification priority automatic operation mode of automatically selecting one of the operation and the dehumidification operation is possible, and during the heating operation, the tip of the wind direction change plate is positioned slightly upward from the horizontal, and during the dehumidification operation A control unit that causes the tip of the wind direction change plate to face further upward during the heating operation. 8. A room temperature sensor for detecting a room temperature, a wind direction change plate for changing an air blowing direction of the indoor unit, and one of a heating operation, a cooling operation and a dehumidifying operation based on a detection value of the room temperature sensor. The operation in the dehumidifying priority automatic operation mode for automatically selecting one is possible, and the air direction change plate is positioned horizontally or slightly upward from the horizontal during the heating operation, and the detection value of the room temperature sensor is a predetermined value during the cooling operation. A controller that positions the tip of the wind direction changing plate slightly below horizontal when the above, and positions the tip of the wind direction changing plate horizontally or slightly above horizontal when less than a predetermined value. Air conditioner. 9. The air conditioner according to any one of claims 1 to 5, wherein when the heating operation is selected in the manual operation mode, when the temperature of the blown air is lower than a predetermined value, the control unit blows the air. An air conditioner comprising means for reducing the amount of air and prohibiting or relaxing the operation of reducing the amount of blown air during a heating mode operation in a dehumidifying priority automatic operation mode. 10. The air conditioner according to claim 9, wherein the indoor unit includes an indoor fan having a variable number of revolutions, and a blown air temperature sensor for detecting a temperature of air blown from the indoor unit. The air conditioner, further comprising: a control unit configured to decrease a rotation speed of the indoor fan when a temperature detection value of the blown air temperature sensor is equal to or less than a predetermined value. 11. The air conditioner according to claim 9, wherein the indoor unit includes an indoor fan having a variable speed and an indoor heat exchanger temperature sensor for detecting a temperature of the indoor heat exchanger. The air conditioner further includes: a unit configured to reduce a rotation speed of the indoor fan when a temperature detection value of the indoor heat exchanger temperature sensor is equal to or less than a predetermined value. 12. The air conditioner according to claim 1, further comprising detecting a temperature of an indoor fan having a variable number of revolutions for changing an amount of air blown from the indoor unit and an indoor heat exchanger. An indoor heat exchanger temperature sensor, wherein during the heating operation selected in the manual operation mode, the control unit controls the indoor heat exchanger when the temperature detected by the indoor heat exchanger temperature sensor is equal to or less than a first set value. When the fan is stopped and the temperature detected by the indoor heat exchanger temperature sensor drops below a second set value lower than the first set value during the heating operation in the dehumidifying priority automatic operation mode, the room An air conditioner that stops the fan.