JPH0331643A - Air conditioning apparatus - Google Patents

Abstract

PURPOSE:To prevent an erroneous decision of a freezing preventing means caused by a temporary reduction in evaporation temperature when an energization is started by a method wherein in case of performing a cooling operation under a condition in which a sucking air temperature of an outdoor heat exchanger is low, an air blower arranged in the outdoor heat exchanger is stopped to increase a discharging pressure. CONSTITUTION:In case of starting a cooling operation, a sucking air temperature at an outdoor heat exchanger 3 is sensed by a temperature sensor 12, the sensed temperature is compared with a predetermined set temperature and decided. In case that the sensed temperature is lower than the set value, a compressor 1 is started while an air blower 4 provided in the outdoor heat exchanger 3 is being stopped, a discharging pressure of the compressor I after energization is sensed by a pressure sensor 11. The sensed pressure is compared with a predetermined set pressure and decided and in case that the sensed pressure is higher than the set pressure, or in case a specified time elapses from the starting of the compressor 1, the air blower 4 is operated. with such an arrangement, in case of a cooling operation in which a suction air temperature of the outdoor heat exchanger 3 is low, an amount of refrigerant flowing in an expansion mechanism 5 is increased and a temporary reduction in evaporating temperature is prevented and an erroneous decision of the freezing preventing means 24 can be avoided and a continuous operation of the compressor 1 can be carried out.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an air conditioner comprising an indoor heat exchanger, an outdoor heat exchanger, an electric expansion valve, and a compressor.

[Conventional technology]

FIG. 7 is an example of a refrigerant circuit diagram of a conventional air conditioner. In the figure, (1) is the compressor, (2) is the four-way switching valve, (
3) is an outdoor heat exchanger equipped with a blower (4), (6th is an expansion mechanism, (6) is an indoor heat exchanger with a blower (7), and (August is an accumulator). They are connected sequentially through refrigerant piping to form a refrigeration cycle.

In addition, (e) is a selection means for selecting operation or stop of the air conditioner, and (7) is for operation of the compressor (1), air blower (4J (
This is a control means for controlling the operation of 73. When the operation of the air conditioner is selected by the selection means @1, the control means (a)
The blowers (4) and (7) operate, and the compressor (1
) is activated, and the air conditioner becomes operational. When the operation of the air conditioner is no longer selected by the selection means (2),
The control means (7) causes the blower (4) (7) to stop, the compressor (1) to stop, and the air conditioner to be in a stopped state.

In addition, (to) is attached to the indoor heat exchanger (7),
This is a temperature detector that detects the evaporation temperature during cooling operation and the condensation temperature during heating operation.The slope is determined by comparing the detected temperature at the temperature sensor port during cooling operation with the preset anti-freezing temperature, and detects when the detected temperature is low. If the detected temperature is higher, the anti-freezing signal is output, and after the anti-freezing signal is output, the de-freezing temperature set higher than the anti-freezing temperature is compared with the detected temperature at the temperature sensor port, and if the detected temperature is higher, the freezing is stopped. It is a freeze determination means that outputs a release signal. The control means (7) stops the compressor (1) and the blower (4J) upon receiving the antifreeze signal 9, and operates the compressor (1) and the blower (4) upon receiving the defreezing signal. .

Since conventional air conditioners were configured as described above, for example, when turning on cooling M or during defrost operation, the compressor (
1) The high temperature and high pressure refrigerant discharged from the four-way switching valve (2)
The air is sent to the outdoor heat exchanger (3), and the air is blown tlA.
It exchanges heat with the air sent from C4) and is liquefied here.

Next, this liquefied refrigerant, that is, liquid refrigerant, is transferred to an expansion mechanism (5
) and exchanges heat with the air sent from the indoor heat exchanger (6J blower (7)) and is vaporized again.

The vaporized refrigerant is transferred to the four-way switching valve (2^) and the accumulator (
8) If it passes, compress it! (1) is inhaled.

In addition, during heating operation, the high-temperature, high-pressure refrigerant discharged from the pressure j1 unit (1) passes through the four-way switching valve +21, is sent to the indoor heat exchanger (June ζ), and is sent from the air blower f!A (7). The liquefied refrigerant, that is, the liquid refrigerant, is then depressurized in the expansion mechanism (6).The depressurized refrigerant is sent to the outdoor heat exchanger (3), where it is liquefied. (4) It exchanges heat with the air sent from the refrigerant and is vaporized again.The vaporized refrigerant passes through the four-way switching valve (2) and the accumulator (8), and then is sucked into the compression fl (1). In this way, a refrigeration cycle is formed.

[Problems to be Solved by the Invention] In the conventional air conditioner as described above, during cooling operation when the temperature of the intake air of the outdoor heat exchanger (3) is low, the discharge pressure rises until the start-up time. , expansion mechanism (5
), the amount of refrigerant flowing through the expansion mechanism (5) is small, and the evaporation temperature temporarily decreases, causing the indoor heat exchanger (6) to freeze. There was a problem that the compressor (1) would be stopped due to incorrect determination.

This invention was made in order to solve the above-mentioned problems, and is caused by freezing due to a temporary drop in evaporation temperature at the time of starting cooling operation when the temperature of the intake air of the outdoor heat exchanger (3) is low. It is an object of the present invention to provide an air conditioner in which a compressor (1) can operate continuously while preventing erroneous determination by a prevention means.

[Means for Solving the Problems] In order to achieve the following objects, the air conditioner of the present invention includes a compressor, an outdoor heat exchanger equipped with a blower, an expansion mechanism, and an indoor heat exchanger. refrigerant circuit,
A temperature detector detects the intake air temperature of the outdoor heat exchanger and 1. Compare and judge the temperature detected by the temperature detector and a preset temperature, and if the detected temperature is lower, a low outside temperature signal is sent. a pressure detector that detects the refrigerant pressure on the discharge side of the compressor I compressor, and a pressure detector that compares and determines the detected pressure of the pressure detector with a preset set pressure, and determines which one is the detected pressure. If the temperature is high, the pressure increase determination means outputs a pressure increase signal, and the low outside air temperature signal output from the outside air temperature determination means at the time of startup during cooling operation stops the blower provided in the outdoor heat exchanger. The air blower is further provided with a control means for operating the blower in response to either the pressure increase signal outputted from the pressure increase determination means or after a predetermined period of time has elapsed since the start of the compressor.

The refrigerant circuit includes a compressor, an outdoor heat exchanger equipped with a blower, an expansion mechanism, and an indoor heat exchanger, a pressure detector that detects the discharge pressure of the compressor, and a pressure detector that detects the discharge pressure of the compressor. The pressure detected by the pressure detector before startup is compared with the preset pressure of ff1l, and if the detected pressure is lower, a pressure reduction number 13 is output, and the pressure is detected after the compressor is started. a pressure determination means that compares and judges the detected pressure of the device and a second set pressure set higher than the first set pressure, and outputs a pressure increase signal if the detected pressure is higher; The blower provided in the outdoor heat exchanger is stopped by the pressure decrease signal from the pressure determination means, and the blower is stopped by either the pressure increase signal from the pressure determination means or after a certain period of time has elapsed since the start of the compressor. The above object can be achieved by providing a control means for operating the apparatus.

Furthermore, the refrigerant circuit includes a compressor, an outdoor heat exchanger, an electric expansion valve, and an indoor heat exchanger, a temperature detector that detects the temperature of air taken into the outdoor heat exchanger, and an outside air temperature determination means that compares and judges the detected temperature of the detector and a preset temperature and outputs a low outside temperature signal if the detected temperature is lower; If the outside air temperature signal is not output, the first initial opening degree is output for a certain period of time to the electric expansion valve, and if the outside air temperature determining means is outputting the low outside air temperature signal, the electric expansion valve is outputted. The above object is achieved by providing the valve with a control means for outputting the first initial opening degree for a certain period of time.

[Operation] In this invention, the temperature of the intake air of the outdoor heat exchanger is detected by the temperature sensor Cζ at the start of cooling operation, and the detected temperature is compared with a preset temperature, and the detected temperature is determined. If the pressure is low, the compressor is started with the blower installed in the outdoor heat exchanger stopped, and after startup, the pressure detector Cζ detects the discharge pressure of the compressor, and the detected pressure and the preset settings are detected. The pressures are compared and determined, and the blower is operated either when the detected pressure is higher or after a certain period of time has passed since the compressor was started.

As a result, during cooling operation when the intake air temperature of the outdoor heat exchanger is low, by stopping the blower equipped with the outdoor heat exchanger I and increasing the discharge pressure, the pressure difference before and after the expansion mechanism is increased. As the amount of refrigerant increases, the amount of refrigerant flowing through the expansion mechanism increases, thereby preventing a temporary drop in evaporation temperature, avoiding erroneous determination by the anti-freezing means, and allowing the compressor to operate continuously.

In addition, a pressure detector detects the balance pressure of the refrigerant circuit before startup, and at the time of startup of cooling operation, the detected pressure is compared with a preset first set pressure, and if the detected pressure is lower, The compressor is started with the blower installed in the outdoor heat exchanger stopped, and after startup, the discharge pressure of the compressor is detected with a pressure detector, and the detected pressure and the first set pressure are set higher than the first set pressure. The two set pressures are compared and determined, and the blower is operated either when the detected pressure is higher or after a certain period of time has passed since the compressor was started. As a result, the balance pressure of the refrigerant circuit before startup is low. During cooling operation when the temperature of the intake air of the outdoor heat exchanger is low, the blower installed in the outdoor heat exchanger is stopped to increase the discharge pressure. As a result, the pressure difference before and after the expansion mechanism increases, and the amount of refrigerant flowing through the expansion mechanism increases, which prevents a temporary drop in evaporation temperature, avoids misjudgment of the anti-freezing means, and allows the compressor to operate continuously. let

Furthermore, when the cooling operation is started, the temperature of the intake air of the outdoor heat exchanger detected by the temperature detector is compared with the preset temperature, and if the detected temperature is lower,
The compressor is started with the initial opening degree of the electric expansion valve set to the second initial opening degree, and is operated while being fixed at this opening degree for a certain period of time. As a result, during cooling operation when the intake air temperature of the outdoor heat exchanger is low, the initial opening of the electric expansion valve is increased and fixed for a certain period of time when the compressor is started, so that the air flowing through the electric expansion valve is The amount of refrigerant increases, and the amount of refrigerant supplied to the suction side of the compressor increases, thereby preventing a temporary drop in evaporation temperature, avoiding erroneous determination by the refrigeration prevention means, and allowing the compressor to operate continuously.

〔Example〕

FIG. 1 is a refrigerant circuit diagram of an air conditioner according to an embodiment of the present invention.

In FIG. 1, (1) to 3) are exactly the same as the conventional device described above. East is a pressure detector that connects to the refrigerant pipe between the compressor (1) and the four-way switching valve (2) to detect the discharge pressure of the compressor (1), and 4 is the suction of the outdoor heat exchanger (3). Temperature detector that detects air temperature, (2) is compressor (1)
(2) is an outside air controller that outputs a low outside temperature signal when the temperature detected by temperature detector 4 is lower than the preset temperature. The temperature determining means (2) is a pressure rise determining means that outputs a pressure increase signal when the pressure detected by the pressure detector east is higher than a preset set pressure.

FIG. 2 shows a flowchart of the control means (goods).

It is determined whether operation of the air conditioner is selected in step OD, and if it is selected, in step (to),
If it is not selected, proceed to step (b). In step (2), determine whether a low outside temperature signal is being output. If it is, then in step -, the compressor (1) and blower are (7) is activated, and the blower (4) is stopped. Next, in step -, it is determined whether a pressure increase signal is being outputted, and if it is being outputted, the process proceeds to step (to), and if it is not being outputted, the process proceeds to step country. In step (to), it is determined whether a certain period of time has elapsed since the compressor (1) was started, and if it has elapsed, the process proceeds to step -.
If the elapsed time has not elapsed, return to step (to). step-
Now, operate the blower (4) and return to step 0υ. In step (b), the compressor (1), blower (4), and blower (7) are stopped, and the process returns to step Op.

In the air conditioner configured as described above, when the cooling operation is started, the temperature of the intake air of the outdoor heat exchanger (3) is detected by the temperature detector 4, and the detected temperature is set in advance and the set temperature is set. If the detected temperature is lower, the compressor (1) is started with the blower (4) provided in the outdoor heat exchanger (3) stopped, and after startup, the compressor (1)
The discharge pressure is detected by the pressure detector aυ, and the detected pressure is compared with the preset set pressure,
The blower (4) is operated either when the detected pressure is higher or after a certain period of time has passed since the compressor (1) was started. As a result, during cooling operation when the intake air temperature of the outdoor heat exchanger (3) is low, the blower (4) provided in the outdoor heat exchanger (3) is stopped and the compressor (
1) By increasing the discharge pressure of the expansion mechanism (51), the pressure difference before and after the expansion mechanism (51) increases and the amount of refrigerant flowing through the expansion mechanism (51) increases, preventing a temporary drop in evaporation temperature and preventing freezing. - It is possible to avoid the erroneous determination and operate the compressor (1) continuously.

FIG. 3 shows that the refrigerant pressure before startup is detected by a pressure detector an, and when the detected pressure is lower than the first set pressure,
By stopping the blower (4) provided in the outdoor heat exchanger and starting the compressor (1) to increase the pressure on the discharge side, a drop in the evaporation temperature is prevented and the freezing prevention determination means (foundation) is activated. This is an example of an air conditioner that can avoid erroneous determinations. aη is a pressure detector that is connected to the refrigerant pipe between the compressor (1) and the four-way switching valve (2) and constantly detects the discharge pressure of the compressor (1) regardless of whether the compressor (1) is running or stopping. , (2) is the operation of the compressor (1), the blower (4)
A control means for controlling the operation of (7) is used to signal a pressure drop when the pressure detected by the pressure detector (b) before starting the compressor (1) is lower than the first set pressure set in advance. and outputs a pressure increase signal when the pressure after starting the compressor (1) detected by the pressure detector an is higher than the second set pressure, which is set higher than the first set pressure. It is a means.

FIG. 4 shows a flowchart of the control means (2).

In step (2), it is determined whether the operation of the air conditioner is selected, and if it is selected, the process proceeds to step (2), and if it is not selected, the process proceeds to step -.

In step (to), it is determined whether a pressure drop signal is being outputted, and if it is being output, the process proceeds to step (to), and if it is not being output, the process proceeds to step (to). step (to)
The compressor (1) and the blower (7) are operated, and the blower (4) is stopped. In step (good), it is determined whether a pressure increase signal is being outputted, and if it is being outputted, the process proceeds to step -, and if it is not being outputted, the process proceeds to step (to). In step (to), it is determined whether a certain period of time has elapsed since the compressor (1) was started, and if it has elapsed, the process advances to step 1, and if it has not elapsed, it returns to step -. In step -, the blower (4) is operated and step (2)
). In step (B), the compressor (1), the blower (
4) and the blower (7), and step (())
I'm back. In step ■, compressor (1), blower (4)
Then, operate the blower (7) and return to step G1).

In the air conditioner configured as described above, when starting cooling operation, pressure detector 4 detects the balance pressure of the refrigerant circuit before starting, and compares the detected pressure with the first set pressure set in advance. If the detected pressure is lower, the compressor (1) is started with the blower (4) provided in the outdoor heat exchanger (3) stopped, and after startup, the compressor (1) is
) is detected by pressure detector 4, and the detected pressure is compared with a second set pressure set higher than the first set pressure.
1) The above blower (
4) Let it run. As a result, during cooling operation when the balance pressure of the refrigerant circuit before startup is low, the blower (4) provided in the outdoor heat exchanger (3) is stopped to increase the discharge pressure of the compressor (1). So, expansion @! 11(
5) As the pressure difference before and after the expansion mechanism increases, the amount of refrigerant flowing through the expansion mechanism increases, which prevents a temporary drop in evaporation temperature, avoids misjudgment of the anti-freezing means, and increases the amount of refrigerant flowing through the expansion mechanism. 1) can be operated continuously.

In the embodiment shown in FIG. 5, at startup, the outdoor heat exchanger (3
) is lower than the preset temperature, the electric expansion valve (5a) is opened at a second initial opening for a certain period of time to prevent the evaporation temperature from decreasing; 1 shows an embodiment of an air conditioner that can avoid erroneous determination by the antifreeze determination means. In the figure,
(1)-(4) (6) (7) (8) Zeng (2) (2
) is similar to the conventional device shown in FIG. Q4 is a pressure detector connected to the refrigerant pipe between the compressor (1) and the four-way switching valve (2) to detect the discharge pressure of the compressor (1), and 4 is the outdoor heat exchanger (3) A temperature sensor (2) detects the temperature, the operation of the compressor (1), and the blower (4).
) (7) and the opening degree of the electric expansion valve (5a).

FIG. 6 shows a flowchart of the control means (b).

At step 0η, it is determined whether operation of the air conditioner has been selected, and if it has been interpreted, the process proceeds to step (), and if it has not been selected, the process proceeds to step (6).

In step (2), it is determined whether a low outside temperature signal is being outputted, and if it is being outputted, the process goes to step 1; if it is not being outputted, the process goes to step -. In step (to), the compressor (1) and the blowers (4) and (7) are operated to output the second initial opening degree. Step-in compressor (1)
and blower (4) (73) and outputs the first initial opening degree.In step (to), it is determined whether a certain period of time has elapsed since the compressor (1) was started, and if it has not elapsed. For example, proceed to step (to), and if it has elapsed, proceed to step r3
Proceed to η. In step -, it is determined whether the difference between the saturation temperature of the temperature detected by temperature detector (a) and the pressure detected by pressure detector α◆ is larger or smaller than a preset setting value, and if it is larger, step (to) is determined. If they are smaller, go to step 4; if they are equal, go back to step (2). In step (to), the opening degree of the electric expansion valve (5a) is increased, and the process returns to step c (until).

In step 4, the opening degree of the electric expansion valve (5a) is decreased and the process returns to step 6p. In the step sequence, compressor (1)
, the blower (4) and the blower (7) are stopped, and the process returns to step Op.

In the air conditioner configured as described above, the temperature of the intake air of the outdoor heat exchanger (3) is detected by the temperature sensor at the time of starting the cooling operation, and the detected temperature and the preset temperature are detected. After comparing and determining, if the detected temperature is lower, the initial opening of the electric expansion valve (5a) is set to a second initial opening that is larger than the first initial opening that is set when the detected temperature is higher. With this setting, the compressor (1) is started, and the electric expansion valve (5 m) is operated with the opening degree fixed at the opening degree C for a certain period of time. As a result, the compressor (
By increasing and fixing the initial opening of the electric expansion valve (li) for a certain period of time at the time of 1) startup, the electric expansion force increases the amount of refrigerant that is supplied to the suction side of the compressor (1). By increasing the amount of refrigerant, it is possible to prevent a temporary drop in the evaporation temperature, avoid erroneous determination by the anti-freeze means, and allow the compressor (1) to operate continuously.

〔Effect of the invention〕

Since the present invention is composed of Cζ as described above, it produces the effects described below. a refrigerant circuit composed of an outdoor heat exchanger equipped with a compressor, an air blower, an expansion mechanism, and an indoor heat exchanger; a temperature detector that detects the temperature of air sucked into the outdoor heat exchanger; an outside air temperature determining means that compares and determines the temperature detected by the detector with a preset temperature and outputs an out-of-zone 9 cm change signal if the detected temperature stage is low; and a pressure detector that detects the discharge pressure of the compressor. and a pressure increase determination means that compares and determines the detected pressure of the pressure detector with a preset set pressure and outputs a pressure increase signal if the detected pressure is higher, and a pressure increase determination means that outputs a pressure increase signal when the detected pressure is higher, and The blower provided in the outdoor heat exchanger is stopped in response to the low outside air temperature signal outputted from the temperature determining means, and the blower provided in the outdoor heat exchanger is stopped in response to the pressure increase signal from the pressure increase determining means, or either after a certain period of time has elapsed from the start of the compressor. Accordingly, a control means for operating the blower is provided.The temporary reduction in evaporation temperature at the time of starting the cooling operation when the temperature of the intake air of the outdoor heat exchanger is low1.
It is possible to prevent such erroneous determination of the anti-freezing means and to allow continuous operation of the compressor.

The refrigerant circuit includes a compressor, an outdoor heat exchanger equipped with a blower, an expansion mechanism, and an indoor heat exchanger, a pressure detector that detects the discharge pressure of the compressor, and a pressure detector that detects the discharge pressure of the compressor. The detected pressure is compared and determined with a first set pressure set in advance, and if the detected pressure is lower, a pressure drop signal is output, and the pressure is set higher than the detected pressure after starting the compressor and the first set pressure. A pressure determining means compares and determines the detected pressure with a second set pressure, and outputs a pressure increase signal when the detected pressure is higher, and the outdoor heat exchanger receives the pressure decrease signal from the pressure determining means at the time of starting the cooling operation. By providing a control means for stopping the blower provided in the compressor and operating the blower in response to either the pressure increase signal from the pressure determining means or after a certain period of time has elapsed since the start of the compressor, the pressure W3 can be reduced. It is possible to prevent erroneous determination by the anti-freeze means due to a temporary drop in evaporation temperature at the time of starting cooling operation when the balance pressure before starting the engine is low, and to allow continuous operation of the compressor.

Further, the refrigerant circuit includes a compressor, an outdoor heat exchanger, an electric expansion valve, and an indoor heat exchanger, a temperature detector that detects the temperature of air taken into the outdoor heat exchanger, and an outside air temperature determination means that compares and determines the detected temperature of the detector and a preset set temperature and outputs a low outside air temperature signal if the detected temperature is lower; A second initial opening degree is set larger than the initial opening degree, and if the outside air temperature determining means does not output the low outside air temperature signal at the time of starting the cooling operation, the electric expansion valve is set to the first initial opening degree for a certain period of time. By providing a control means for outputting a second initial opening degree for a certain period of time to the electric expansion valve when the outside air temperature determination means outputs the low outside air temperature signal, Prevents misjudgment of anti-freeze measures due to a temporary drop in evaporation temperature when starting cooling operation when the intake air temperature of the outside heat exchanger is low.
The compressor can be operated continuously.

[Brief explanation of drawings]

1, 3, and 5 are each an embodiment of the present invention Cζ
Figures M2, 4, and 6 are flowcharts showing the operation of the control means shown in Figures 1, 3, and 5, respectively, and Figure 7 is the overall configuration of a conventional air conditioner. It is a diagram. In these figures, (1) is a compressor, (3) is an outdoor heat exchanger, (4) is a blower for the outdoor heat exchanger, (6) is an expansion mechanism, (5a) is an electric expansion valve, ( Number 6 is the indoor heat exchanger, 0 is the pressure detector, 0 is the temperature detector, (goods) is the control means, ni) is the outside air temperature determination means, and (to) is the pressure rise determination means. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (3)

[Claims] (1) A refrigerant circuit composed of a compressor, an outdoor heat exchanger equipped with a blower, an expansion mechanism, and an indoor heat exchanger, a temperature detector that detects the temperature of the air sucked into the outdoor heat exchanger,
Outside air temperature determination means that compares and judges the temperature detected by the temperature detector and a preset temperature, and outputs a low outside air temperature signal if the detected temperature is lower; detects the refrigerant pressure on the discharge side of the compressor; a pressure detector that compares the detected pressure of the pressure detector with a preset set pressure and outputs a pressure increase signal if the detected pressure is higher; and a pressure increase determination means that outputs a pressure increase signal when the detected pressure is higher; stopping the blower provided in the outdoor heat exchanger based on the low outside air temperature signal output from the outside air temperature determining means;
The air blower is further provided with a control means for operating the blower in response to either the pressure increase signal output from the pressure increase determination means after the compressor is started, or after a certain period of time has elapsed since the compressor was started. harmonization device. (2) A refrigerant circuit composed of a compressor, an outdoor heat exchanger equipped with a blower, an expansion mechanism, and an indoor heat exchanger, a pressure detector that detects the refrigerant pressure on the discharge side of the compressor, and a pressure detector that detects the refrigerant pressure on the discharge side of the compressor; Comparing and determining the detected pressure of the pressure detector before startup with a preset first setting pressure, and if the detected pressure is lower, a pressure decrease signal is output, and the pressure detector detects the pressure after starting the compressor. a pressure determination means that compares and determines the detected pressure with a second set pressure set higher than the first set pressure and outputs a pressure increase signal if the detected pressure is higher; The blower provided in the outdoor heat exchanger is stopped in response to the pressure decrease signal outputted from the determination means, and the pressure increase signal outputted from the pressure determination means after the compressor is started, or the compressor An air conditioner comprising: a control means for operating the blower at any time after a predetermined period of time has elapsed from activation. (3) A refrigerant circuit consisting of a compressor, an outdoor heat exchanger, an electric expansion valve, and a nitrous inner exchanger, a temperature detector that detects the temperature of the intake air of the outdoor heat exchanger, and the temperature detector an outside air temperature determination means that compares and determines the detected temperature with a preset temperature and outputs a low outside temperature signal if the detected temperature is lower; If the signal is not output, the first initial opening degree is output for a certain period of time to the electric expansion valve, and if the outside air temperature determining means is outputting the low outside temperature signal, the electric expansion valve is outputted. An air conditioner comprising: a control means for outputting a second initial opening degree that is larger than the first initial opening degree for a certain period of time.