JPH0763447A - Refrigerating cycling apparatus - Google Patents

Abstract

PURPOSE:To protect a compressor by making a start-up pattern at the start-up of a refrigerating cycling apparatus into a low-speed start-up. CONSTITUTION:For example, in the case of a cooling operation, a refrigerant of high pressure and high temperature is conducted to an outdoor heat exchanger 3 where a refrigerant gas is liquefied to discharge heat of condensation outdoor. The gas further liquefied is made into a gas-liquid two-phase refrigerant of low pressure and low temperature by a decompression device 4 to be conducted to an indoor heat exchanger 7 where the refrigerant absorbs heat from an indoor air to evaporate to be made into a gas refrigerant of low temperature and low pressure. Thus a cooling operation is performed. Then a refrigerating cycling operation is performed, in which the refrigerant is fed into a suction port 1a of a compressor 1 through a four-way valve 2. In this case, a low-speed start-up operation is performed to start up the compressor 1 while putting hours therein. Accordingly, it is possible to protect the compressor 1 against abnormal heating due to ill installation or the like.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to cost reduction and high reliability of a protection device for an inverter-driven compressor used in a refrigeration cycle device.

[0002]

2. Description of the Related Art FIG. 6 shows a conventional refrigeration cycle apparatus disclosed in, for example, Japanese Patent Laid-Open No. 3-20579 (conventional example 1). A refrigeration cycle apparatus in which a compressor 1, a condenser 3, a pressure reducer 4, and an evaporator 7 for converting a low-temperature low-pressure gas refrigerant into a high-temperature high-pressure gas refrigerant are connected in sequence has pressure detection means for detecting the pressure state of the low-temperature low-pressure gas refrigerant. .

The refrigeration cycle apparatus configured as described above will be described below. 6, a compressor 1 for compressing a low-temperature low-pressure gas refrigerant into a high-temperature high-pressure gas refrigerant, a condenser 3 for converting the high-temperature high-pressure gas refrigerant into a high-temperature high-pressure liquid refrigerant, and a decompressor 4 for converting the high-temperature high-pressure liquid refrigerant into a low-temperature low-pressure two-phase refrigerant. In the refrigeration cycle apparatus in which the evaporator 7 for changing the low-temperature low-pressure two-phase refrigerant to the low-temperature low-pressure gas refrigerant is sequentially connected, the pressure switch 24 for detecting the low-pressure is provided. The pressure switch 24 is turned on when the refrigerant pressure is equal to or higher than the set value and is turned off when the refrigerant pressure is equal to or lower than the set value, and the control unit 9 continuously detects the ON / OFF state of the pressure switch 24, and judges whether or not the refrigerant is insufficient and the compressor Control 1 Further, even if the compressor 1 is in vacuum operation due to forgetting to open the stop valve due to improper installation, the pressure switch 24 can protect the compressor 1.

As another conventional example (conventional example 2),
An air conditioner has been proposed which includes a check switch for checking the installation status after installation in a plurality of multi-system type air conditioners in one outdoor unit having a compressor and an outdoor heat exchanger (special feature: Kaihei 4-
No. 273942).

[0005]

Since the conventional refrigeration cycle apparatus is constructed as described above, it has the following problems. Since a low pressure switch is used as a protection measure during abnormal low pressure operation such as gas shortage or improper installation when the stop valve is forgotten to be opened, there is a problem that cost is high and workability during manufacturing deteriorates. Example 1). As a means for detecting improper installation, it is necessary to provide a miswiring check switch and a temperature sensor in the indoor heat exchanger, and it is costly because a complicated control means must be provided. However, there is a problem in reliability because there is no guarantee that it will be used reliably, and there is a problem that it is not suitable for refrigeration cycle devices such as room air conditioners, which are sold a lot (conventional example 2).

It is an object of the present invention to provide a refrigeration cycle device which can protect a compressor in an inverter-driven refrigeration cycle device at low cost and with high reliability.

[0007]

A refrigeration cycle apparatus according to claim 1 is a compressor for compressing a refrigerant and driven by an inverter, a condenser for condensing a gas refrigerant into a liquid refrigerant, and a two-phase liquid refrigerant. In a refrigeration cycle apparatus in which a decompressor that changes to a refrigerant and an evaporator that changes the two-phase refrigerant to a gas refrigerant are sequentially connected, the compressor has a start pattern at the time of starting the refrigeration cycle apparatus set to low speed operation start. Is characterized by.

The refrigeration cycle apparatus of claim 2 is the same as that of claim 1.
In the refrigeration cycle apparatus described above, the compressor is characterized in that a coating material having good heat transfer characteristics is provided between the surface portion of the compressor container to which the abnormality detection sensor is attached and the heating source during abnormal operation.

A refrigeration cycle apparatus according to a third aspect of the present invention includes a compressor that compresses a refrigerant and is driven by an inverter, a condenser that condenses a gas refrigerant into a liquid refrigerant, and a pressure reducer that converts the liquid refrigerant into a two-phase refrigerant. In a refrigeration cycle apparatus in which an evaporator that converts the two-phase refrigerant into a gas refrigerant is sequentially connected, the compressor once performs a high-speed operation start after the start-up pattern when the refrigeration cycle apparatus is started, and then a low-speed operation start. It is characterized by changing to.

The refrigeration cycle apparatus of claim 4 is the same as that of claim 1.
In the refrigeration cycle apparatus described, a stop valve for installation, a means for detecting the temperature of an abnormality detection sensor and a discharge refrigerant temperature sensor provided in the compressor, and the temperature of the abnormality detection sensor is the temperature of the discharge refrigerant temperature sensor. When the height is higher, it is provided with means for determining the failure to open the stop valve and means for displaying the information about the opening of the stop valve on the indoor display section.

[0011]

In the refrigeration cycle apparatus of the first aspect, abnormal heating of the compressor due to improper installation can be detected at low cost, and the compressor can be protected.

According to the refrigeration cycle apparatus of the second aspect, an abnormality of the compressor can be detected promptly, the reliability of the compressor protection is improved, and the comfort is improved.

In the refrigeration cycle apparatus according to the third aspect of the present invention, the speed at which the cool air is blown out during the cooling operation and the speed at which the warm air is blown out during the heating operation are increased, and the comfort is further improved.

In the refrigeration cycle apparatus according to the fourth aspect of the present invention, it is possible to determine abnormal stoppage of the compressor due to forgetting to open the stop valve, and it is possible to easily inform the user of installation failure information from the indoor side.

[0015]

【Example】

Example 1. Embodiment 1 of the present invention will be described below with reference to FIG. A compressor 1 for compressing a low-temperature low-pressure gas refrigerant into a high-temperature high-pressure gas refrigerant, a condenser for converting the high-temperature high-pressure gas refrigerant into a high-temperature high-pressure liquid refrigerant, a decompressor 4 for converting the high-temperature high-pressure liquid refrigerant into a low-temperature low-pressure two-phase refrigerant, and a low-temperature low-pressure refrigerant In a refrigeration cycle apparatus (hereinafter referred to as an air conditioner) in which an evaporator that changes a two-phase refrigerant to a low-temperature low-pressure bus refrigerant is sequentially connected, the compressor 1 is driven by an inverter and is capable of variable speed up to a maximum operating frequency of 120 HZ,
An abnormality detection sensor 15 for detecting an abnormality of the compressor 1 is installed outside the compressor container on the surface of the compressor container. In addition, the indoor control unit 10 collectively controls information such as a relay circuit for sending power to the outdoor unit, operating conditions of cooling or heating, and indoor set temperature. The outdoor control unit 9 controls the operating frequency of the compressor 1 based on the signal sent from the indoor control unit 10, and also controls switching of the four-way valve 2 and the like. Further, the outdoor control unit 9 is the compressor 1
As a startup pattern of, a startup pattern for high-speed startup and a startup pattern for low-speed startup are stored.

The operation of the air conditioner shown in FIG. 1 will be described in detail. First, the flow of the refrigerant during the cooling operation will be described. The low-pressure low-temperature gas refrigerant is supplied to the suction port 1 of the compressor 1.
It is sucked into the compression element part from b, compressed here to a high-pressure high-temperature gas refrigerant, and guided to the four-way valve 2 from the discharge port 1a of the compressor 1. In the cooling operation, the high-pressure and high-temperature refrigerant is guided to the outdoor heat exchanger 3, where the gas refrigerant is liquefied,
The heat of condensation is released to the outside of the room. Further, the liquefied high-pressure refrigerant becomes a low-temperature low-pressure gas-liquid two-phase refrigerant by the pressure reducer 4 and is guided to the indoor heat exchanger 7. Here, heat is absorbed from the air in the room and the refrigerant evaporates to become a low-temperature low-pressure gas refrigerant. That is, the cooling operation is performed. Then, the refrigeration cycle operation is performed in which the refrigerant is sent through the four-way valve 2 to the suction port 1a of the compressor 1.
Next, the flow of the refrigerant during the heating operation will be described. In this case, by switching the four-way valve 2 and reversing the flow direction of the refrigerant between indoor and outdoor, only the indoor heat exchanger 7 functions as a condenser and the outdoor heat exchanger 3 functions as an evaporator. The description is omitted because it is similar to that during the cooling operation. Further, in the arrows shown in FIG. 1, the solid line indicates the flow direction of the refrigerant during the cooling operation, and the broken line indicates the flow direction of the refrigerant during the heating operation.

The start-up operating frequency pattern of the inverter for driving the compressor 1 has two patterns, that is, an operating frequency pattern that rapidly rises to a specified operating frequency (usually the maximum operating frequency) and an operating frequency pattern that gradually rises slowly. It is stored in the outdoor control unit 9 and used properly depending on the case. Next, the operating frequency pattern when starting the compressor 1 will be described with reference to FIG. Original power supply (outlet) 11
When is turned on from OFF (step 100), the signal of check mode = 1 is stored in the outdoor control unit 9 (step 101). When the main body power supply 14 or the remote control power supply 13 of the air conditioner is turned on (step 102), the air conditioner is activated. At this time, when the check mode = 1, the low speed start-up operation mode is set and the detection mode for improper installation is automatically entered (steps 104 and 105). If the check mode is 0, normal startup is started and high-speed startup operation is performed (step 108). In the case of the normal start-up operation, cool air is rapidly blown out during the cooling operation and warm air is rapidly blown out during the heating operation, so that comfort is improved. Next, the necessity of the slow start operation will be described. Due to improper installation, if the gas side 5b of the stop valve is left open for cooling operation, or if the liquid side 5a of the stop valve is left open for cooling operation, or if the liquid side 5a of the stop valve is opened When the heating operation is performed in a state of being forgotten, the suction port 1b of the compressor 1 gradually becomes a vacuum state and the compressor 1 performs the vacuum operation. Generally, the heat generation of the compressor 1 is cooled by the circulation of the refrigerant, but when the vacuum operation is performed, the winding 18 of the motor and the bearing 1
9 and the compression element portion 17 are insufficiently cooled, resulting in damage. When the protection due to the abnormal heating is performed outside the compressor container, it takes time for the heating part in the compressor container to transfer heat to the outside of the compressor container. Therefore, when the high-speed start-up operation is performed, the compressor is damaged before the heat is transferred to the abnormality detection sensor 15 provided outside the compressor container. Therefore, it is necessary to perform the low-speed start-up operation and start the compressor over time. Become. Generally, a high-pressure shell type compressor 1 in which the pressure inside the compressor container is high
The motor winding 18 is more likely to be damaged than the compression element portion 17 is damaged, and in the case of the low pressure shell type compressor 1 in which the pressure inside the compressor container is low, the compression element portion 17 is easily damaged. Here, the low-pressure shell type compressor 1 will be described as an example.
Next, the operation contents during the low speed start-up operation will be described. Before starting the low speed start-up operation, the check time is set to 0 (step 10).
4). Then, when the low speed start operation is started, the operating frequency of the compressor 1 is slowly increased at 1HZ every 3 seconds. Therefore,
Although the blowing speeds of the cold air and the hot air blown out to the indoor unit are reduced, the protection of the compressor 1 shown below is given priority. When the low speed start-up operation is started, the temperature of the abnormality detecting thermostat 15 is detected to detect the abnormality of the compressor 1, and it is detected whether the temperature becomes 120 ° C. or higher (step 106). Here, the compressor 1 is 1
When the temperature is 20 ° C. or higher, the outdoor control unit 9 issues a command to stop the compressor 1 and stops the compressor 1 to protect it (step 107). Here, when the abnormality detection thermometer is 120 ° C. or lower, the outdoor control unit 9 reads the operating frequency (step 1
09). If the operating frequency is 60 HZ or less, the check time is not counted, the check time is set to 0, and the low speed start operation is continued. If the vehicle is operating at 60 Hz or higher, the check time is counted (step 110). If the check time exceeds 10 minutes, the installation status is judged to be normal, and the check mode =
It is set to 0 (step 112). This check mode = 0
Is stored in the outdoor control unit 9 unless the main power source is turned off. Therefore, when the air conditioner body 14 or the remote control power source 13 is turned on next time, the normal startup operation is performed. That is, the low speed operation is performed only when the main power supply 11 is turned on and the main body power supply 14 is turned on to start the air conditioner.
Since FF is performed, it is possible to protect the compressor at the time of improper installation, etc., with almost no loss of comfort.

Next, the work for installing the air conditioner by the installation operator will be described by taking a room air conditioner in which the indoor unit and the outdoor unit are separated as an example. First, the indoor unit and the outdoor unit are installed in predetermined places, and the piping of the indoor unit is exposed to the outside of the room. Next, flaring processing connection is performed between the indoor unit and the outdoor unit by the extension pipes 6a and 6b. Further, the power supply wiring 16 and the signal wiring 16 of the indoor unit and the outdoor unit are connected. Next, an air purging operation is performed in which the air in the indoor side pipe and the air in the extension pipes 6a and 6b is discharged to the outside of the pipe by the refrigerant filled in the outdoor unit.
After that, the stop valves 6a, 6 on the liquid side and the gas side of the outdoor unit
Fully open b, and the installation work is completed. When the installer completes the installation, the installer normally turns on the main power
Turn on the main body power to start the air conditioner,
Make sure that cold or hot air is blown out from the indoor unit. Therefore, when the installation is completed and the air conditioner is started, the system is in the low-speed startup operation mode that automatically detects abnormalities such as improper installation. Therefore, even if the air conditioner is started with the stop valves 6a and 6b left open due to improper installation. ,
The compressor 1 can be protected without being damaged.

Example 2. In the first embodiment, when the outlet power supply is turned on from off, the compressor 1 is operated at a low speed to detect an abnormality in the compressor 1. At this time, an abnormality is detected in order to facilitate detection of abnormal heating of the compressor 1. Detection sensor 15
The abnormality of the compressor 1 may be quickly detected by coating the compressor container, which connects the surface of the compressor container to which is attached and the heating source during abnormal operation, with a material having good heat transfer characteristics.

Next, a second embodiment will be described. The interior of the compressor container that connects the surface of the compressor container with the abnormality detection sensor 15 to the heating source during abnormal operation is coated with a material with good heat transfer characteristics in order to quickly detect abnormality in the compressor 2
3 is performed (Fig. 3). Others are the same as those of the refrigeration cycle apparatus shown in the first embodiment, and the description thereof is omitted. Next, the low speed operation of the second embodiment will be described. Check time = 0 before starting low-speed startup operation. Then, when the low speed start-up operation is started, the operating frequency of the compressor is slowly increased at 1 HZ for 1 second. In Example 1, the operating frequency of the compressor 1 was increased at 3 seconds 1 HZ during low-speed operation, but the compressor container that connects the surface of the compressor container to which the abnormality detection sensor 15 is attached and the heating source during abnormal operation Is coated with a material having good heat transfer characteristics for quickly detecting abnormality of the compressor 1 23
As a result, the operating frequency rises faster. Therefore, the cooling air speed in the cooling operation and the warm air speed in the heating operation also increase, so that comfort is improved accordingly. Others are the same as those in the first embodiment, and the description thereof will be omitted.

Example 3. In Example 1, in the low speed start-up operation when the main power supply (outlet power supply) was turned on, the operating frequency of the compressor 1 was increased at a constant speed. At this time, however, the high-speed start-up operation was performed once. May be changed to a slow start operation.

Next, a detailed description of the third embodiment will be given. When the main power supply 11 (outlet power supply) is turned on and the main body power is turned on and the air conditioner is started, a low speed start operation is performed, but the operation frequency is 1 second at the same start speed as the high speed start operation for about 30 seconds. Start up every 10HZ, then 6
When the operating frequency rises to 0HZ, constant speed operation is performed for about 30 seconds. After that, the operating frequency is increased to a low speed at 1 second 1HZ. Here, the reason why the high-speed start-up operation is performed up to about 60 HZ is that, according to the research conducted by the applicant, the compression element portion 17 and the bearing portion 19 have a small amount of heat generation even if vacuum operation is performed at an operating frequency of about 60 HZ. If it takes about 30 minutes, there will be no problem, so high-speed start-up operation is performed at the beginning of start-up. In order to raise the maximum operating frequency to 120 HZ, it takes about 6 minutes in the starting pattern of the first embodiment and about 2 minutes in the second embodiment, but in the present starting pattern, it is raised to 120 HZ which is the maximum operating frequency. The start-up time can be greatly reduced to about 1 minute and 30 seconds (Fig. 4). Therefore, the time when the cool air blows in the cooling operation and the warm air blows out in the heating operation can be shortened, so that the comfort is improved even when the main power source is started from OFF to ON.

Example 4. In the first embodiment, only the abnormality detection sensor 15 provided on the surface of the compressor container is used as protection against forgetting to open the stop valve, but if the discharge refrigerant temperature sensor 48 shown in FIG. It can be more clearly determined that the compressor has stopped abnormally due to forgetting to open it. Next, the detailed operation will be described. It has already been described that the compressor 1 is heated and damaged when the compressor 1 is started by forgetting to open the stop valve, but since the refrigerant does not flow at this time, the temperature of the discharge refrigerant temperature sensor 48 is stored in the compressor container. The temperature is lower than that of the provided abnormality detection sensor 15. According to the applicant's study, the temperature of the discharged refrigerant temperature sensor unit 48 is lower than the temperature of the abnormality detection sensor 15 by about 40 deg. Therefore, the discharge refrigerant temperature sensor 4
If 8 and the abnormality detection sensor 15 are used together, it is possible to accurately perform protection by distinguishing between compressor protection stop during overload operation of the compressor 1 and failure to forget to open the stop valve. Hereinafter, description will be given when the discharge refrigerant temperature sensor 48 and the abnormality detection sensor 15 are used together. When the compressor 1 is started and the abnormality detection sensor 15 becomes 120 ° C. or higher, the outdoor control unit 9 detects the discharge refrigerant temperature sensor unit 48 and if it is 90 ° C. or lower, it is determined that the compressor 1 is due to forgetting to open the stop valve. Then, the abnormal signal is transferred to the indoor control unit 10.
Next, the indoor control unit 10 displays a message of forgetting to open the stop valve on the display unit 47, and indicates installation failure information from the indoor side. Further, when the abnormality detection sensor 15 is 120 ° C. or higher and the discharge refrigerant temperature sensor 48 is 90 ° C. or higher, it is determined that the compressor protection is stopped in the overload operation, and the abnormality signal is transferred to the indoor control unit 10, The control unit 10 causes the display unit 47 to display a message of stopping overload operation protection of the compressor 1. The other operations are the same as those in the first embodiment, and the description thereof will be omitted.

[0024]

According to the refrigeration cycle apparatus of the present invention, a compressor for compressing a refrigerant and driven by an inverter, a condenser for condensing a gas refrigerant into a liquid refrigerant, and a decompression for converting the liquid refrigerant into a two-phase refrigerant. In a refrigeration cycle apparatus in which a compressor and an evaporator that converts the two-phase refrigerant into a gas refrigerant are sequentially connected, the compressor has a configuration in which the start pattern at the time of starting the refrigeration cycle apparatus is a low-speed operation start, It is possible to detect abnormal heating of the compressor due to improper installation at low cost and protect the compressor.

The refrigeration cycle apparatus of claim 2 is the same as that of claim 1.
In the refrigeration cycle apparatus described, since the compressor is configured to include a coating material having good heat transfer characteristics between the surface portion of the compressor container to which the abnormality detection sensor is attached and the heating source during abnormal operation, compression is performed. The abnormality of the machine can be detected quickly, the reliability of the compressor protection is improved and the comfort is improved.

A refrigeration cycle apparatus according to a third aspect of the present invention includes a compressor that compresses a refrigerant and is driven by an inverter, a condenser that condenses a gas refrigerant into a liquid refrigerant, and a pressure reducer that converts the liquid refrigerant into a two-phase refrigerant. In the refrigeration cycle apparatus in which an evaporator that changes the two-phase refrigerant into a gas refrigerant is sequentially connected, the compressor once performs a high-speed operation start after the start-up pattern when the refrigerant cycle apparatus is started, and then a low-speed operation start. Since the configuration is changed to, the speed at which the cool air is blown out during the cooling operation and the speed at which the warm air is blown out during the heating operation are increased, and comfort is further improved.

The refrigeration cycle apparatus of claim 4 is the same as that of claim 1.
In the refrigeration cycle apparatus described, a stop valve for installation, a means for detecting the temperature of an abnormality detection sensor and a discharge refrigerant temperature sensor provided in the compressor, and the temperature of the abnormality detection sensor is the temperature of the discharge refrigerant temperature sensor. When it is higher, it has a means for judging that the stop valve is not opened properly and a means for displaying the stop valve open information on the indoor display section. It is possible to determine the stop and easily inform the user of the installation failure information from the indoor side.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a refrigeration cycle apparatus according to a first embodiment of the present invention.

FIG. 2 is a flowchart showing a starting pattern of the compressor of the refrigeration cycle apparatus according to Embodiment 1 of the present invention.

FIG. 3 is a configuration diagram of a compressor of a refrigeration cycle device according to Embodiment 2 of the present invention.

FIG. 4 is an operating frequency characteristic diagram at the time of starting the compressor of the refrigeration cycle apparatus according to Examples 1 to 3 of the present invention.

FIG. 5 is a configuration diagram of essential parts of a refrigeration cycle apparatus according to Embodiment 4 of the present invention.

FIG. 6 is a configuration diagram of a conventional refrigeration cycle apparatus.

[Explanation of symbols]

 1 Compressor 1a Discharge port of compressor 1b Intake port of compressor 2 Four-way valve 3 Outdoor heat exchanger 4 Pressure reducer 5a Stop valve (liquid side) 5b Stop valve (gas side) 6a Extension pipe (liquid side) 6b Extension pipe (Gas side) 7 Indoor heat exchanger 8 Accumulator 9 Outdoor control unit 10 Indoor control unit 11 Outlet power supply 12 Remote control receiver 13 Remote control 14 Main body switch 15 Abnormality detection sensor 16 Indoor / outdoor power supply and signal connection cable 17 Compressor compression element section 18 Motor 19 Bearing 20 Main shaft 21 Oil pump 22 Terminal part 23 Heat transfer characteristic improving coating material (copper material) 24 Pressure switch 25, 26 Check valve 27 Heating expansion valve 28 Check valve 29 Liquid tank 30, 31, 32 Electric Type Flow control valve 33, 34, 35 Check valve 36, 37, 38 Heat exchange temperature sensor 3 9 Outdoor control unit 40 Multi-control unit 41, 42, 43 Indoor control unit 44, 45 Inverter circuit 46 Wrong wiring check switch 47 Display unit

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toshihiro Tanaka 3-18-1 Oga, Shizuoka City Mitsubishi Electric Corporation Shizuoka Manufacturing (72) Inventor Tatsuya Mochizuki 3-18-1 Oka Shizuoka Mitsubishi Electric Corporation Shizuoka Plant (72) Inventor Kenji Matsuda 3-18-1 Oga, Shizuoka City Mitsubishi Electric Co., Ltd.Shizuoka Plant (72) Inventor Takami Takatsuki 3-18-1 Oka, Shizuoka Mitsubishi Electric Co., Ltd. Shizuoka Inside the factory

Claims (4)

[Claims] 1. A compressor for compressing a refrigerant, driven by an inverter, and a condenser for condensing a gas refrigerant into a liquid refrigerant,
In a refrigeration cycle apparatus in which a decompressor that changes the liquid refrigerant into a two-phase refrigerant and an evaporator that changes the two-phase refrigerant into a gas refrigerant are sequentially connected, the compressor has a starting pattern at the time of starting the refrigeration cycle apparatus. A refrigeration cycle device characterized by being started at a low speed. 2. The compressor is provided with a coating material having good heat transfer characteristics between the surface of the compressor container to which the abnormality detection sensor is attached and the heating source during abnormal operation. The refrigeration cycle device described. 3. A compressor that compresses refrigerant and is driven by an inverter, and a condenser that condenses gas refrigerant into liquid refrigerant.
In a refrigeration cycle apparatus in which a decompressor that changes the liquid refrigerant into a two-phase refrigerant and an evaporator that changes the two-phase refrigerant into a gas refrigerant are sequentially connected, the compressor has a starting pattern at the time of starting the refrigeration cycle apparatus. After performing high-speed operation start once,
A refrigeration cycle device characterized by being changed to low speed operation start. 4. A stop valve for installation, means for detecting the temperature of an abnormality detection sensor and a discharge refrigerant temperature sensor provided in the compressor, and the temperature of the abnormality detection sensor is higher than the temperature of the discharge refrigerant temperature sensor. The refrigeration cycle apparatus according to claim 1, further comprising: a unit that determines that the stop valve has not been opened properly and a unit that displays the stop valve open information on an indoor display unit.