JPH10332186A - Air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To control an indoor temperature appropriately, by controlling the amount of wind of an indoor blower according to the difference between the temperature of indoor air and a set indoor temperature, and at the same time setting the amount of wind larger in a heating-cooling automatic operation mode than in a normal operation mode. SOLUTION: An indoor temperature sensor 13 for detecting an indoor temperature Ta is provided at the suction wind path of indoor air being formed by an indoor blower. An automatic amount-of-wind control means controls the amount of wind (namely speed) of the indoor blower according to a difference ΔT between a detection temperature Ta of the indoor temperature sensor 13 and a set indoor temperature Ts of a remote controller 22 and at the same time sets the amount of wind larger in a cooling-heating automatic operation mode than in a normal operation mode, thus achieving a proper indoor temperature control and at the same time saving energy in the cooling-heating automatic operation mode.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner having a heat pump type refrigerating cycle capable of cooling and heating.

[0002]

2. Description of the Related Art A cooling / heating automatic operation mode in which one of cooling and heating operations is automatically selected and executed, and one of cooling and heating operations selectively executed in response to an external request There is an air conditioner having a function of a normal operation mode to perform the operation and an automatic air flow control function of controlling a flow rate of an indoor blower in accordance with a difference between a room temperature and a set room temperature. As for the air volume control, as the indoor temperature approaches the set indoor temperature and the temperature difference becomes smaller, the air volume of the indoor blower is reduced.

[0003]

Generally, in the cooling / heating automatic operation mode, an energy-saving operation in which the air conditioning capacity is smaller than that in the normal operation mode is required. However, the air volume control of the indoor blower is the same regardless of the difference between the cooling / heating automatic operation mode and the normal operation mode. Therefore, it is difficult to appropriately control the indoor temperature only by reducing the air conditioning capacity in the cooling / heating automatic operation mode. Becomes

[0004] The present invention has been made in view of the above circumstances,
An object of the present invention is to provide an air conditioner capable of energy-saving operation in a cooling / heating automatic operation mode while enabling appropriate indoor temperature control. Another object of the present invention is to provide an air conditioner that can reliably avoid an abnormal increase in the high-pressure side pressure of the refrigeration cycle during heating.

[0005]

Means for Solving the Problems First Invention (Claim 1)
Air conditioners are equipped with a compressor, an outdoor heat exchanger, an indoor heat exchanger, and an indoor blower with a variable air volume, and the air conditioner capable of cooling and heating automatically operates either cooling or heating. Operating means in a cooling / heating automatic operation mode to be selectively selected and executed; operating means in a normal operation mode to selectively execute one of a cooling operation and a heating operation in response to an external request; and a temperature of indoor air. And an air temperature of the indoor blower is controlled in accordance with a difference between a detected temperature of the indoor temperature sensor and a set indoor temperature, and the air volume value is set to be lower in the cooling / heating automatic operation mode than in the normal operation mode. Automatic air volume control means for setting a large value.

That is, in the air conditioner of the first invention,
The air volume of the indoor blower is controlled according to the difference between the indoor air temperature and the set indoor temperature. However, the airflow value is set larger in the cooling / heating automatic operation mode than in the normal operation mode.

[0007] The air conditioner of the second invention (claim 2) is:
In the first invention, the automatic air volume control means divides a difference between the detected temperature of the indoor temperature sensor and the set indoor temperature into a plurality of zones and assigns an air flow value to each of the zones, and at least a part of these zones. Means for setting the airflow value of the zone (1) in the cooling / heating automatic operation mode larger than in the normal operation mode.

[0008] An air conditioner according to a third invention (claim 3) is:
In the first or second invention, the automatic air volume control means comprises:
The minimum airflow value in the cooling / heating automatic operation mode is set to be larger than the minimum airflow value in the normal operation mode.

An air conditioner according to a fourth invention (claim 4) is:
In the first or second invention, the automatic air volume control means comprises:
The maximum airflow value in the cooling / heating automatic operation mode is set to be larger than the maximum airflow value in the normal operation mode.

An air conditioner according to a fifth invention (claim 5) is
In the fourth invention, a heat exchanger temperature sensor for detecting the temperature of the indoor heat exchanger is provided, and the automatic air volume control means sets the maximum air volume value at the time of heating in the cooling / heating automatic operation mode to the detected temperature of the heat exchanger temperature sensor. Set variably according to.

[0011] An air conditioner according to a sixth invention (claim 6) is:
An air conditioner that includes a compressor, an outdoor heat exchanger, an indoor heat exchanger, and a variable air volume blower, and that can perform cooling and heating. A heat exchanger temperature sensor for detecting the temperature, and a detected temperature of the indoor temperature sensor at the time of heating or higher,
When the temperature detected by the heat exchanger temperature sensor exceeds a predetermined value,
Control means for limiting the minimum air flow of the indoor blower to a predetermined value or more.

An air conditioner according to a seventh aspect of the present invention (claim 7) is:
In a sixth aspect, the control means performs restriction for a predetermined time. An air conditioner according to an eighth aspect of the present invention (claim 8)
In the invention, the control means sets the limit to 1 every operation start.
Do it twice.

[0013] An air conditioner according to a ninth invention (claim 9) is:
A heat exchanger temperature that detects the temperature of the indoor heat exchanger in an air conditioner that has a refrigeration cycle that connects a compressor, an outdoor heat exchanger, an indoor heat exchanger, etc., and circulates refrigerant, and that can cool and heat. A sensor, when heating, when the detected temperature of the heat exchanger temperature sensor is equal to or higher than a predetermined value, high-pressure protection means for performing a measure for suppressing the high-pressure side pressure of the refrigeration cycle, and the predetermined value of the high-pressure protection means And control means for setting the detected temperature of the heat exchanger temperature sensor to be lower than the set value when the detected temperature is lower than the set value.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 2, a heat pump type refrigeration cycle is mounted on the outdoor unit X and the indoor unit Y.

Reference numeral 1 denotes a variable capacity compressor. An outdoor heat exchanger 3 is connected to a discharge port of the compressor 1 via a four-way valve 2 by piping. An indoor heat exchanger 5 is connected to this outdoor heat exchanger 3 via a pressure reducer, for example, an expansion valve 4 via a pipe, and the indoor heat exchanger 5 is connected via a four-way valve 2 to a suction port of the compressor 1. .

An outdoor blower 6 is provided near the outdoor heat exchanger 3. The outdoor blower 6 circulates outside air through the outdoor heat exchanger 3. In the vicinity of the indoor heat exchanger 5, a variable-speed indoor blower 7 is provided. The indoor blower 7 circulates indoor air through the indoor heat exchanger 5.

The indoor heat exchanger 5 is provided with a heat exchanger temperature sensor 12 for detecting the temperature (condenser temperature) Tc of the indoor heat exchanger 5 during heating. An indoor temperature sensor 13 for detecting the indoor air temperature Ta is provided in an indoor air intake air path formed by the indoor blower 7.

FIGS. 3 and 4 show specific examples of the indoor unit Y. FIG. FIG. 3 is a side view of the inside of the housing of the indoor unit Y, and FIG. 4 is a view of the inside of the housing of the indoor unit Y from above. That is, the housing 50 of the indoor unit Y is embedded in the opening of the ceiling surface S. The lower surface of the housing 50 is flush with the ceiling surface S, and the lower surface thereof is provided with an air inlet 51 substantially at the center, and a plurality of air outlets 52 are provided at positions surrounding the air inlet 51. Is done. A ventilation space is formed in the housing 50 from the air suction port 51 to each of the air suction ports 52, and the indoor blower 7 (and the indoor blower motor 7) is formed in the ventilation space.
M) is provided. The indoor heat exchanger 5 is disposed at a position surrounding the indoor blower 7 in the ventilation space.

When the indoor blower 7 operates, indoor air is sucked into the housing 50 from the air suction port 51, and is blown into the room from each air outlet 52 through the indoor heat exchanger 5. A filter 53 is provided inside the air suction port 51,
An indoor temperature sensor 13 is attached to an air passage between the filter 53 and the indoor blower 7. A heat exchanger temperature sensor 12 is attached to the indoor heat exchanger 5.

FIG. 1 shows the control circuit. The indoor control unit 20 of the indoor unit Y is connected to the commercial AC power supply 30. And
The outdoor control unit 40 of the outdoor unit X is connected to the indoor control unit 20 via the power line ACL and the serial signal line SL.

The indoor control unit 20 comprises a microcomputer and its peripheral circuits. In this indoor control unit 20,
Light receiving unit 21, speed control circuit 23, heat exchanger temperature sensor 1
2, and the indoor temperature sensor 13 are connected. And
The outdoor blower motor 7M is connected to the speed control circuit 23.

The light receiving section 21 receives infrared light transmitted from a remote control device (hereinafter abbreviated as a remote controller) 22. The speed control circuit 23 controls the speed (that is, the air volume) of the indoor blower motor 7M to another stage. Specific means of speed control may be any of phase control of an AC motor, inverter drive control using a DC motor and an inverter circuit, and tap switching control.

The outdoor controller 40 comprises a microcomputer and its peripheral circuits. In this outdoor control unit 40,
The four-way valve 2, the inverter circuit 41, and the outdoor blower motor 6M are connected. Then, in the inverter circuit 41,
The compressor motor 1M is connected.

The inverter circuit 41 includes a power line ACL
Rectified, converted to a voltage of a frequency (and level) according to a command from the outdoor control unit 40, and output. This output is supplied to the compressor motor 1M as drive power.

The indoor control unit 20 and the outdoor control unit 40 control the air conditioner while mutually performing power supply voltage synchronized data transfer through the serial signal line SL. [1] ~
[9] is provided.

[1] The refrigerant discharged from the compressor 1 flows in the direction of the solid line arrow shown in FIG. 2, thereby forming a cooling cycle, and the outdoor heat exchanger 3 is used as a condenser and the indoor heat exchanger 5 is used as an evaporator. A means for functioning and performing a cooling operation (and a dry operation).

[2] The refrigerant discharged from the compressor 1 is caused to flow in the direction of the dashed arrow shown in FIG. 2 by switching the four-way valve 2, thereby forming a heating cycle and causing the indoor heat exchanger 5 to operate as a condenser and outdoor heat exchanger. Means for causing the heater 3 to function as an evaporator and performing a heating operation.

[3] During cooling and heating, the difference ΔT between the detected temperature Ta of the indoor temperature sensor 13 and the set temperature Ts of the remote controller.
As the air-conditioning load, and the output frequency (the operating frequency of the compressor 1) F of the inverter circuit 41 according to the temperature difference ΔT.
Means to control.

[4] An operating means in a cooling / heating automatic operation mode for automatically selecting and executing one of the cooling and heating operations. [5] Operating means in the normal operation mode for selectively executing either one of the cooling and heating operations in response to an external request by operating the remote controller 22.

[6] Detected temperature Ta of the indoor temperature sensor 13
The air volume (that is, the speed) of the indoor blower 7 is controlled in accordance with the difference ΔT between the air temperature and the indoor temperature Ts set by the remote controller 22, and the air volume value is set to be larger in the automatic cooling / heating operation mode than in the normal operation mode. Air volume control means.

[7] At the time of heating, when the detected temperature Ta of the indoor temperature sensor 13 is equal to or higher than a predetermined value (for example, 25 ° C.) and the detected temperature Tc of the heat exchanger temperature sensor 12 is equal to or higher than a predetermined value (for example, 30 ° C.), Control means for limiting the minimum air volume of the blower 7 to a predetermined value or more;

[8] During heating, when the detected temperature Tc of the heat exchanger temperature sensor 12 exceeds a predetermined value (for example, either 56 ° C. or 58 ° C.), a measure for suppressing the high pressure side pressure of the refrigeration cycle ( High-pressure protection means for performing operating frequency reduction of the compressor 1 or release control of a refrigerant bypass from a high-pressure side to a low-pressure side.

[9] The predetermined value of the high-pressure protection means is set to a set value (for example, the detection temperature Tc of the heat exchanger temperature sensor 12).
The control means sets the temperature as high as 58 ° C when the temperature is equal to or higher than 40 ° C, and sets the temperature as low as 56 ° C when the detected temperature Tc is lower than the set value (40 ° C).

Next, the operation of the above configuration will be described with reference to the flowcharts of FIGS. In the normal operation mode (NO in step 101) and when the automatic air volume mode is not set (NO in step 102), the air volume of the indoor blower 7 is set according to a command from the remote controller 22 (step 10).
3).

In the normal operation mode (NO in step 101),
In the automatic air volume mode (YES in step 102) and during cooling (NO in step 104), the temperature difference ΔT (= Ta−Ts)
The air flow rate of the indoor blower 7 is set by comparing the air flow rate setting condition Bc in FIG.
).

For example, if the temperature difference ΔT is + 1 ° C. or more, the large air volume H due to the high speed operation of the indoor blower motor 7, and if the temperature difference ΔT is less than + 1 ° C. and more than + 0.5 ° C., the middle (upper) speed of the indoor blower motor 7 When the middle air volume (high) M + and the temperature difference ΔT due to the operation are less than + 0.5 ° C. and 0 ° C. or more, the middle air volume M and the temperature difference ΔT due to the medium speed operation of the indoor blower motor 7 are 0.
When the temperature is lower than −0.5 ° C. and higher than −0.5 ° C., the small air volume (high) L + and the temperature ΔT due to the low (up) speed operation of the indoor blower motor 7 are −
When the temperature is lower than 0.5 ° C., the small air volume L due to the low speed operation of the indoor blower motor 7 is set, and when the thermo-off (operation is interrupted), the small air volume UL due to the ultra low speed operation of the indoor fan motor 7 is set.

In the normal operation mode (NO in step 101),
In the automatic air volume mode (YES in step 102) and during heating (YES in step 104), the air volume of the indoor blower 7 is set by comparing the temperature difference ΔT with the normal heating air volume setting condition Bh in FIG. Is performed (step 106).

For example, if the temperature difference ΔT is less than −1 ° C., the large air volume H due to the high speed operation of the indoor blower motor 7, and if the temperature difference ΔT is −1 ° C. or more and less than −0.5 ° C., Above) Medium air volume (high) M + due to speed operation and temperature difference ΔT of −0.5 ° C. or more and less than 0 ° C., medium air volume M and temperature difference ΔT due to medium speed operation of indoor blower motor 7 are 0.
When the temperature is not lower than + ° C. and lower than + 0.5 ° C., the small air volume (high) L + and the temperature ΔT due to the low (up) speed operation of the indoor blower motor 7 are +
When the temperature is 0.5 ° C. or more, the small air volume L due to the low speed operation of the indoor blower motor 7 is set, and the micro air volume UL due to the ultra low speed operation of the indoor blower motor 7 when the thermo-off (operation is interrupted) is set.

On the other hand, in the cooling / heating automatic operation mode (step 10
1), and in the air volume automatic mode (YES in step 107).
) And during cooling (NO in step 108), the temperature difference ΔT
The air flow rate of the indoor blower 7 is set by contrasting the cooling air flow rate setting condition Ac for automatic cooling and heating in FIG. 7 (step 10).
9).

For example, if the temperature difference ΔT is + 1 ° C. or more, a large air volume (high) H due to the maximum speed operation of the indoor blower motor 7
+, When the temperature difference ΔT is less than + 1 ° C. and more than + 0.5 ° C., the medium air volume (high) M + by the inside (upper) speed operation of the indoor blower motor 7; when the temperature difference ΔT is less than + 0.5 ° C. and more than 0 ° C., the room When the middle air flow (high) M + and the temperature difference ΔT due to the middle (upper) speed operation of the blower motor 7 are less than 0 ° C. and −0.5 ° C. or more, the middle air volume M and the temperature ΔT due to the middle speed operation of the indoor blower motor 7 are − If the temperature is less than 0.5 ° C, the indoor blower motor 7
The small air volume (high) L + due to the low (up) speed operation is set.

In the cooling / heating automatic operation mode (YE of step 101)
S), in the automatic air volume mode (YES in step 107) and during heating (YES in step 108), the temperature difference ΔT is compared with the heating air volume setting condition Ah in automatic cooling / heating in FIG.
Further, the air volume of the indoor blower 7 is set by comparing the detected temperature Tc of the heat exchanger temperature sensor 13 with the air volume setting condition C (step 110).

For example, if the temperature difference ΔT is less than -1 ° C., the large air volume (high) H due to the maximum speed operation of the indoor blower motor 7
+, When the temperature difference ΔT is −1 ° C. or more and less than −0.5 ° C., the medium air volume (high) M + by the inside (upper) speed operation of the indoor blower motor 7, and the temperature difference ΔT is −0.5 ° C. or more and 0 ° C. If the temperature is less than 0 ° C. and less than + 0.5 ° C., the middle air volume M and the temperature ΔT of the indoor blower motor 7 due to the medium speed operation are less than + 0.5 ° C. Is + 0.5 ° C or higher, the indoor blower motor 7
The small air volume (high) L + due to the low speed operation is set.

However, in this case, as for the large air volume (high) H + at the maximum air volume value, the temperature difference ΔT is −1 ° C.
If the detected temperature Tc of the heat exchanger temperature sensor 13 is in the Q zone of 47 ° C. or more, the temperature is set as it is, but the detected temperature Tc is in the P zone of less than 47 ° C., as shown in FIG. The house is changed and set to the large air volume H one rank lower.

During cooling (NO in step 111),
The indoor blower 7 is operated with the set air volume (YES in step 117). During heating (YES in step 111),
When the detected temperature Ta of the indoor temperature sensor 13 is 25 ° C. or more (YES in step 112), the detected temperature Tc of the heat exchanger temperature sensor 13 is 30 ° C. or more (YES in step 113), and the set air volume for the indoor blower 7 is If it is less than a predetermined value, for example, less than [low wind (high) L +] (YES in step 114), the indoor blower 7 is forcibly operated with [low wind (high) L +] (YES in step 115). This air volume restriction is performed only for a predetermined time and once each time the operation is started.

If the set airflow for the indoor blower 7 is equal to or more than [weak wind (high) L +] (NO in step 114), the indoor blower 7 is operated at the set airflow (step 117).
YES).

However, the detected temperature T of the room temperature sensor 13
a is 25 ° C. or more (YES in step 112), if the detected temperature Tc of the heat exchanger temperature sensor 13 is less than 30 ° C. (step 112).
(NO at 113), the indoor blower 7 is operated at the set air volume (YES at step 117).

At the start of heating (when restarting operation after thermo-off,
The detected temperature Ta of the room temperature sensor 13 is lower than 25 ° C. (including when returning to operation after defrosting) (YES in step 112).
If the detected temperature Tc of the heat exchanger temperature sensor 13 is lower than 30 ° C. (NO in step 113), the indoor blower is in a standby state until the detected temperature Tc of the heat exchanger temperature sensor 13 reaches 30 ° C. Operation 7 is suspended.

By the way, the cooling air volume setting condition B at the normal time
c, the cooling air volume setting condition Ac during automatic cooling and heating, the heating air volume setting condition Bh during normal operation, and the heating air volume setting condition Ah during automatic cooling and heating are the difference ΔT between the room temperature Ta and the set room temperature Ts.
Is divided into a plurality of zones, and the airflow value is assigned to each of these zones, and the airflow values of at least some of these zones are set to be larger in the cooling / heating automatic operation mode than in the normal operation mode. That is, the minimum airflow value in the cooling / heating automatic operation mode is set to be larger than the minimum airflow value in the normal operation mode. The maximum airflow value in the cooling / heating automatic operation mode is set to be larger than the maximum airflow value in the normal operation mode.

As described above, the temperature difference Δ corresponding to the air conditioning load
By controlling the air volume of the indoor blower 7 in accordance with T and setting the air volume value in the cooling / heating automatic operation mode to be larger than that in the normal operation mode, the air conditioning capacity for performing energy-saving operation in the cooling / heating automatic operation mode is set. Even when the (operating frequency of the compressor 1) is set to be small, the reduced air conditioning capacity can be compensated for by the increased air volume of the indoor blower 7,
Therefore, appropriate room temperature control is possible.

Further, under the air flow setting conditions in the cooling / heating automatic operation mode, the amount of decrease in the air flow value is set smaller as the indoor temperature Ta approaches the set indoor temperature Ts, and the minimum air flow value is made larger than that in the normal operation mode. Since the setting is made, the room temperature Ta can be quickly converged to the set room temperature Ts.

Further, during heating in the cooling / heating automatic operation mode,
If the detected temperature Tc of the heat exchanger temperature sensor 13 is in the Q zone of 47 ° C. or higher, the large air volume (high) H + at the maximum air flow value is set as it is, but the P zone in which the detected temperature Tc is lower than 47 ° C. Is set to the large air volume H one rank lower, the temperature of the air blown into the room can be maintained at an optimal predetermined temperature or higher.

During heating, the room temperature Ta is as high as 25 ° C. or more,
Moreover, under the condition that the heat exchanger temperature Tc is 30 ° C. or more, if the air volume of the indoor blower 7 is small, the high pressure side pressure of the refrigeration cycle rises abnormally, and accordingly, the heat exchanger temperature Tc becomes a predetermined value (for example, 56 ° C. or The temperature rises above 58 ° C.) and the high-pressure protection means (reducing the operating frequency of the compressor 1 and the release control of the refrigerant bypass from the high-pressure side to the low-pressure side) are activated (step 120), and in the worst case, the high-pressure switch (Not shown) may be activated to stop the operation, but under such conditions, the minimum air flow of the indoor blower 7 is limited to a predetermined value or more, so before the high-pressure protection function is activated. It is possible to suppress an increase in the high pressure side pressure. Unnecessary stoppage of operation due to the operation of the high-pressure switch can be avoided, so that efficient air-conditioning without interruption is possible, and it is possible to contribute to improvement of the energy saving effect.

Further, by limiting the minimum air volume of the indoor blower 7 to a predetermined value or more, the followability of the rise of the heat exchanger temperature Tc to the rise of the high pressure side pressure is improved, and the high pressure protection function can be properly operated. is there.

In particular, when the heat exchanger temperature Tc is 40 ° C. or higher, the higher value of 58 ° C. is selected (YES in step 118, step 119) as the predetermined value which is the operating point of the high-pressure protection means. When Tc is less than 40 ° C., for example, when the heat exchanger temperature Tc cannot keep up with the increase in the high-pressure side pressure, such as when heating is started (when operation is resumed after thermo-off and operation is restored after defrosting). In the situation, the lower 56 ° C is selected (YES in step 118, step 120), so even if the follow-up is slow, the high-pressure protection function must be activated even if the high-pressure side pressure rises abnormally. Can be. The present invention is not limited to the above embodiment, and various modifications can be made without changing the gist.

[0055]

As described above, according to the present invention,
The air volume of the indoor blower is controlled according to the difference between the indoor air temperature and the set indoor temperature, and the air volume value is set to be larger in the cooling / heating automatic operation mode than in the normal operation mode. It is possible to provide an air conditioner capable of performing energy-saving operation in a cooling / heating automatic operation mode while enabling temperature control.

Further, according to the present invention, when the indoor temperature is equal to or higher than a predetermined value and the temperature of the indoor heat exchanger is equal to or higher than a predetermined value during heating, the minimum air volume of the indoor blower is limited to a predetermined value or more. An air conditioner that can reliably avoid an abnormal increase in the high-pressure side pressure of the refrigeration cycle during heating can be provided.

[Brief description of the drawings]

FIG. 1 is a block diagram of a control circuit according to one embodiment.

FIG. 2 is a configuration diagram of a refrigeration cycle of the embodiment.

FIG. 3 is an exemplary cross-sectional view of the configuration of the indoor unit of the embodiment, viewed from the side.

FIG. 4 is a cross-sectional view of the configuration of the indoor unit of the embodiment, viewed from above.

FIG. 5 is a flowchart for explaining the operation of the embodiment.

FIG. 6 is a flowchart following FIG. 5;

FIG. 7 is a view showing air volume setting conditions during cooling in the embodiment.

FIG. 8 is a diagram showing air volume setting conditions during heating in the embodiment.

FIG. 9 is a diagram showing air volume setting conditions during heating in the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Variable capacity compressor 3 ... Outdoor heat exchanger 5 ... Indoor heat exchanger 7 ... Indoor blower 12 ... Heat exchanger temperature sensor 13 ... Indoor temperature sensor 20 ... Indoor control part 23 ... Speed control circuit 40 ... Outdoor control part 41 ... Inverter circuit.

Claims (9)

[Claims] 1. A compressor, an outdoor heat exchanger, an indoor heat exchanger,
An air conditioner having an indoor fan with variable air flow and capable of cooling and heating, operating means in a cooling and heating automatic operation mode for automatically selecting and executing one of cooling and heating operations, and cooling and heating. Operating means in a normal operation mode for selectively performing either one of the operations in response to an external request; an indoor temperature sensor for detecting the temperature of indoor air; a detected temperature of the indoor temperature sensor and a set indoor temperature And an automatic air volume control means for controlling the air volume of the indoor blower in accordance with the difference, and setting the air volume value in the cooling / heating automatic operation mode to be larger than that in the normal operation mode. Air conditioner. 2. The automatic air flow control means according to claim 1, wherein the automatic air flow control means divides a difference between the detected temperature of the indoor temperature sensor and the set indoor temperature into a plurality of zones and assigns an air flow value to each of the zones. Means for setting the airflow value of at least some of the zones in the cooling / heating automatic operation mode to be larger than in the normal operation mode. 3. The air conditioner according to claim 1, wherein the automatic air volume control means sets the minimum air volume value in the cooling / heating automatic operation mode to be larger than the minimum air volume value in the normal operation mode. . 4. The air conditioner according to claim 1, wherein the automatic air volume control means sets a maximum air volume value in a cooling / heating automatic operation mode to be larger than a maximum air volume value in a normal operation mode. . 5. The heat exchanger according to claim 4, further comprising a heat exchanger temperature sensor for detecting a temperature of the indoor heat exchanger, wherein the automatic air volume control means determines a maximum air volume value during heating in a cooling / heating automatic operation mode by the heat exchanger. An air conditioner characterized by being variably set according to a temperature detected by a temperature sensor. 6. A compressor, an outdoor heat exchanger, an indoor heat exchanger,
An air conditioner that includes an indoor blower having a variable air flow and capable of cooling and heating; an indoor temperature sensor that detects a temperature of indoor air; a heat exchanger temperature sensor that detects a temperature of the indoor heat exchanger; and heating. At the time, the detected temperature of the room temperature sensor is a predetermined value or more,
An air conditioner comprising: a control unit that limits a minimum air volume of the indoor blower to a predetermined value or more when a temperature detected by the heat exchanger temperature sensor is equal to or higher than a predetermined value. 7. The air conditioner according to claim 6, wherein the control means performs the restriction for a predetermined time. 8. The air conditioner according to claim 6, wherein the control means performs the restriction once each time the operation is started. 9. An air conditioner comprising a refrigeration cycle for connecting a compressor, an outdoor heat exchanger, an indoor heat exchanger and the like to circulate a refrigerant, and capable of cooling and heating, wherein the temperature of the indoor heat exchanger is A heat exchanger temperature sensor for detecting; and a high-pressure protection unit for performing a measure for suppressing a high-pressure side pressure of the refrigeration cycle when a temperature detected by the heat exchanger temperature sensor becomes a predetermined value or more during heating. An air conditioner comprising: control means for setting the predetermined value of the high-pressure protection means to be lower when the temperature detected by the heat exchanger temperature sensor is lower than a set value than when the detected temperature is equal to or higher than the set value.