JP2001091012A - Control device for air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a control device to perform avoidance when a cooling operation test is not carried out, due to worsening of an environment condition during a winter season. SOLUTION: A control device for an air conditioner is constituted such that a refrigerating cycle is provided and cooling operation where a heat-exchanger on the utilizing side is operated as an evaporator and or heating operation, where a heat-exchanger on the utilization side is operated as a condenser is practicable. A control device is provided to be operated, such that when test operation at cooling operation is selected, it is decided from the environmental conditions whether cooling operation is possible, and when cooling operation is impossible, test operation by heating operation is executed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a compressor, a heat source side heat exchanger,
A refrigeration cycle in which a decompression device, a use-side heat exchanger, and a four-way switching valve are connected in a ring by a refrigerant pipe to enable a cooling operation / heating operation, and a hot water supply source and a hot water heat exchanger are connected in a ring by a hot water pipe. The present invention relates to test operation control of an air conditioner having a hot water circuit, and particularly to test operation control in winter.

[0002]

2. Description of the Related Art In a conventional air conditioner, a test operation of a hot water circuit is performed by operating a hot water supply source and checking the operation of the hot water circuit from a rise in the temperature of a hot water heat exchanger provided on the user side. The operation of the refrigeration cycle was confirmed from the temperature change of the use side heat exchanger when the heating operation / cooling operation was performed.

[0003]

In the air conditioner configured as described above, especially when a test operation of the cooling operation is performed in winter, the temperature of the use side heat exchanger acting as an evaporator is lower than a predetermined value. In that case, stop the trial run and display an error,
This was to prevent the use side heat exchanger from freezing, and the trial operation was not completed.

[0004] The test operation of the refrigeration cycle only needs to operate normally in either the cooling operation or the heating operation, and there is a problem even when a test operation of the cooling operation is requested under environmental conditions where cooling operation is impossible. This is to provide a control device that does not cause the problem.

[0005]

According to the present invention, a refrigeration cycle is constituted by using a compressor, a heat source side heat exchanger, a pressure reducing device, a use side heat exchanger, and a four-way switching valve, and the use side heat exchange is performed by the four-way switching valve. In a control device of an air conditioner configured to be able to perform a cooling operation in which a heater acts as an evaporator or a heating operation in which a use-side heat exchanger acts as a condenser, when a test operation in the cooling operation is selected, the environmental condition is reduced. It is provided with a control device that determines whether the cooling operation is possible or not and performs a test operation by the heating operation when the cooling operation is not possible.

Further, the environmental condition is to judge that the cooling operation cannot be performed when the temperature of the use side heat exchanger acting as an evaporator during the cooling operation is lower than a predetermined value.

Further, the environmental condition is to judge that the cooling operation cannot be performed when the outside air temperature is lower than a predetermined value during the cooling operation.

Further, the environmental condition is for judging that the cooling operation cannot be performed when the room temperature is lower than a predetermined value during the cooling operation.

Further, a refrigeration cycle is constituted by using a compressor, a heat source side heat exchanger, a pressure reducing device, a use side heat exchanger, and a four-way switching valve, and the four-way switching valve causes the use side heat exchanger to function as an evaporator. A cooling operation or a heating operation in which the use-side heat exchanger acts as a condenser is configured to be possible, and a hot water circuit that circulates hot water between a hot water supply source and a hot water heat exchanger is provided, and air in the conditioned room is provided. In a control unit of an air conditioner comprising the use-side heat exchanger and the hot water heat exchanger arranged in order from the windward in a single unit circulating, using hot water supplied through a hot water circuit. After performing the test operation of the heating operation, when performing the test operation of the cooling operation in which the use side heat exchanger acts as an evaporator, it is determined whether or not the cooling operation is possible from the environmental conditions, and the cooling operation is not possible. Trial run by heating operation In which a control device to perform.

Further, the environmental condition is to judge that the cooling operation cannot be performed when the temperature of the use side heat exchanger acting as an evaporator during the cooling operation is lower than a predetermined value.

Further, the environmental condition is characterized in that when the outside air temperature is lower than a predetermined value during the cooling operation, it is determined that the cooling operation cannot be performed.

Further, the environmental condition is for judging that the cooling operation cannot be performed when the room temperature is equal to or lower than a predetermined value during the cooling operation.

Further, the environmental condition is a condition for judging that the cooling operation cannot be performed when the temperature of the hot water heat exchanger disposed on the windward side of the utilization side heat exchanger acting as an evaporator during the cooling operation is lower than a predetermined value. It is.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic diagram showing a hot water circuit and a refrigeration cycle of the present invention. In this figure, 5a and 5b are indoor units provided in the conditioned room, 8 is an outdoor unit provided outdoors, 3 is a heat source side unit composed of a boiler or the like for supplying hot water, A general-purpose device having a function of circulating hot water for hot water heating in response can be used.

The heat source side unit 3 and the indoor unit 5a
And are connected by signal lines so that signals can be exchanged with each other.

Hot water from the heat source side unit 3 is supplied to a hot water pipe 12.
And the return pipe 11 constitute a circulation circuit of hot water.
A variable flow rate valve 14a and a hot water heat exchanger (radiator) 13a are connected in series in the indoor unit 5a between the second unit 2 and the return pipe 11, and the variable flow rate valve 14b and the hot water heat exchanger 13b are connected indoors. They are connected in series in the unit 5b.

The flow rate of the hot water flowing through the hot water heat exchangers 13a and 13b can be adjusted by adjusting the opening of the variable flow rate valves 14a and 14b. That is, the heating (heating) capacity can be controlled based on the load.

The conditioned air heated by the hot water heat exchangers 13a and 13b is supplied to the conditioned room by a blower (not shown) as indicated by solid arrows.

The outdoor unit 8 includes a compressor 17 (a compressor of a variable operating capacity capable of arbitrarily setting an operating capacity between a first set value and a second set value smaller than the set value). , A four-way switching valve 18, an outdoor heat exchanger 19, an electric expansion valve 20, a strainer 21, and an accumulator 23, so that the indoor heat exchanger 22 is located upstream of the hot water heat exchanger 13 b in the indoor unit 5 a. Are located.

These devices are connected in a ring by a refrigerant pipe so as to form a refrigeration cycle in which the refrigerant discharged from the compressor 17 circulates. By switching the four-way switching valve 18, the indoor heat exchanger 22 functions as an evaporator (during cooling operation) or as a condenser (during heating operation).

Therefore, when performing the cooling operation in the indoor unit 5a, the indoor heat exchanger 22 is closed by closing the variable flow rate valve 14a, operating the compressor 17 and setting the four-way switching valve 18 to the state shown by the solid line in FIG. As a result, the refrigerant evaporates, and the cooling operation of the conditioned room becomes possible.

During the heating operation, the heating operation is performed by opening the variable flow rate valve 14a and supplying hot water to the hot water heat exchanger 13a. At this time, if the compressor 17 is operated and the four-way switching valve 18 is switched to the state shown by the dotted line in FIG. 1, the refrigerant is condensed in the indoor heat exchanger 22 and the heating capacity can be increased.

By operating the refrigerant heat exchanger 22 as an evaporator and simultaneously supplying hot water to the hot water heat exchanger 13a, the dehumidification operation of the conditioned room becomes possible. That is, dehumidified air is obtained by reheating the air cooled by the evaporator and the water from which the water is condensed and removed by the hot water heat exchanger 13a.

At this time, if the opening of the flow rate variable valve 16 is adjusted to adjust the flow rate of the hot water, the amount of heating at the time of reheating can be adjusted.
The temperature of the conditioned air blown into the conditioned room during the dehumidifying operation can be adjusted.

FIG. 2 is a block diagram showing a control circuit of the indoor unit 5a. In this figure, reference numeral 25 denotes a plug, which is connected to the indoor wiring and is connected to commercial AC power (for example, 100 AC).
V). This AC power is supplied to the inside of the control circuit via the switch 26, and is supplied to the outdoor unit 8 via the normally open contact 27 a of the power relay 27 and the terminal 28. Normally open contact piece 27
a closes during operation of the air conditioner to enable operation of the outdoor unit.

Reference numeral 29 denotes a DC fan for blowing air, which circulates air in the room (the room to be conditioned) to the hot water heat exchanger 15a and the indoor heat exchanger 22. This DC fan 29
This is a brushless motor in which a DC constant voltage output from a motor power supply 30 is switched by a drive circuit 31 in accordance with the rotation angle of the rotor and a predetermined stator winding is energized to continuously rotate the rotor.

The switching in the drive circuit 31 is controlled by the microcomputer 32 (control unit), and the rotation speed of the DC fan 29 can be changed by changing the constant voltage output from the motor power supply 30. This voltage may be controlled by the microcomputer 32.

Reference numeral 33 denotes a control circuit power supply,
It supplies power to drive elements (microcomputers, relays, various sensors, etc.) other than 9, and is connected in series with a motor power supply 30 together with a fuse 34.

Reference numerals 35 and 36 denote a serial power supply and a serial circuit, respectively, which enable transmission and reception of signals to and from the microcomputer of the outdoor unit 8 via a terminal 28 and a signal line (the terminal is a common line with the power supply). A signal from the microcomputer 32 is superimposed on the constant voltage generated by the serial power supply 35 by the serial circuit 36 and output from the terminal;
It also outputs the received signal to the microcomputer 32. As a signal system for transmission and reception, a general-purpose PCM system or the like can be used, but it is not limited to this.

Reference numeral 37 denotes an interface circuit for transmitting and receiving signals to and from the heat source side unit (water heater) 3 via the signal line 7, and enables transmission and reception of signals between the microcomputer 32 and the heat source side unit 3. .

Numeral 40 denotes a storage unit which stores initial constants of the microcomputer and reads these constants when the microcomputer 32 is initialized.

Reference numeral 42 denotes a speaker, which outputs a signal reception sound, an alarm sound, and the like as necessary, and is controlled by an output from the microcomputer 32.

Reference numerals 44 and 45 denote flap motors and step motors for driving the variable flow rate valve 16, which are controlled via a drive circuit 43 by signals from the microcomputer 32. By driving the flap motor (step motor) 44, the angle of the conditioned air discharged from the indoor unit 5 to the conditioned room can be changed. Further, by driving the step motor 45, the opening degree of the flow rate variable valve 16 changes, and the flow rate of the hot water can be changed.

Reference numeral 46 denotes a display unit, which is a receiving circuit including an LED whose lighting is controlled by a signal from the microcomputer 32 and a receiving IC for receiving a wireless signal (infrared signal) from a remote controller. The signal is output to the microcomputer 32 after demodulation.

Reference numeral 47 denotes a room temperature sensor,
The sensor a is provided on the air suction side and detects the temperature of the indoor air. The output of this sensor is used for controlling the intake temperature after the microcomputer 32 performs A / D conversion.

A sensor for detecting the room temperature may be provided in a remote controller, and the temperature detected by the sensor may be received by a receiving circuit of the display unit 46 and used for operation control.

Reference numeral 48 denotes a refrigerant heat exchanger temperature sensor attached to the indoor heat exchanger 22. The temperature of the indoor heat exchanger 22 is detected, and the microcomputer 32 controls the overload state or abnormal temperature based on the detected temperature. Is what you do.

Reference numeral 49 denotes a hot water heat exchanger temperature sensor, which detects the temperature of the hot water heat exchanger 15, and the microcomputer 32 controls the overload state and abnormal temperature (freezing) based on this temperature. .

Reference numeral 50 denotes a discharge temperature sensor for detecting the temperature of conditioned air discharged from the air conditioner to the conditioned room and performing control for abnormal temperature.

Reference numeral 51 denotes a switch board, which is a switch for switching a mode during operation such as test operation / normal operation / stop, and a plurality of display LEDs for identifying a cause at the time of occurrence of an abnormality are provided nearby.

The indoor unit 5a thus configured
Receives the signal based on the operation of the remote controller (not shown), performs the air-conditioning operation, and sets the operating capacity of the compressor to the first set value and the second set value so that the optimal air-conditioning operation can be performed. It is controlled automatically between and. Such control of the driving capability is performed by a driving capability control unit configured by a program in the microcomputer 32.

The opening degree of the variable flow rate valve 14a is also determined by the heating operation /
In the dehumidifying operation or the like, control is performed so that an optimal air-conditioning operation can be performed according to the indoor load. At the same time, a signal for controlling the heat source unit 3 (start of hot water supply, change of tap water temperature, etc.) is transmitted via the interface circuit 37.

FIG. 3 is a block diagram schematically showing a control circuit mounted on the outdoor unit. The control circuit is connected to the terminal plate 28 shown in FIG.

In this figure, 62 is a power supply circuit,
The AC power of 100 V from the indoor unit obtained through the first and second terminals of the terminal plate 61 is double-voltage rectified and smoothed. The DC power output from the power supply circuit 62 is output to an inverter circuit 63 in which switching elements are connected in a three-phase bridge shape, and the three-phase AC (compressor 1)
7 uses an induction motor), or after being converted into a waveform (when the compressor 17 uses a DC brushless motor) that can energize the stator winding corresponding to the rotational position of the rotor, the compressor 17 Supplied to

Reference numeral 64 denotes a microcomputer which receives a control signal from the microcomputer 32 of the indoor unit via the third terminal of the terminal plate 61 and the serial circuit 65, and mainly controls the rotation speed of the compressor 17, switching of the four-way switching valve 18, and the like. The operation of the fan motor 66 is controlled.

Reference numeral 67 denotes an outside air temperature sensor for detecting the outside air temperature.
Are used for control and transmitted to the indoor unit 5a via a signal line.

Therefore, the outdoor unit 8 is connected to the indoor unit 5a.
Operating the compressor 17 between a first set value and a second set value (<first set value) with an operation capacity corresponding to a signal indicating the operation capacity sent from the When an abnormality occurs in the outdoor unit 8, the indoor unit 5a automatically performs a protection operation.

FIG. 4 is a flowchart showing the operation of the automatic test run performed by the hot water supply source 3. This flowchart is a subroutine showing a part of the main program for controlling the entire operation of the hot water supply source 3, and returns to the main program via "R".

In this flowchart, step S
In step 1, the “test run signal by hot water heating” is sent to the indoor unit 5a.
Output to The indoor unit 5a performs a trial operation based on the flowchart shown in FIG. 5 and returns the result (normal output / abnormal output) to the hot water supply source 3.

In step S2, the supply of hot water is started to enable the heating operation using the hot water. In step S3, based on the result of the test operation obtained from the indoor unit 5a, if "abnormal output" (No) is determined, S4, proceeding to step S5, after stopping the supply of hot water, "abnormality of hot water heating"
(Test run error) is displayed and the program returns to the main program.

If "normal output" (Yes) is determined in step S3, the process proceeds to steps S6 and S7 to stop the supply of hot water, and then a "test operation signal by heating using a heater" (heating operation by a refrigeration cycle) is sent to the room. Unit 5
Output to a.

When the "abnormal output" (No) is determined based on the result of the test operation obtained from the indoor unit 5a in step S8, the process proceeds to step S9, where the supply of hot water is stopped. (Abnormal) is displayed and the program returns to the main program.

If "normal output" (Yes) is determined in step S8, the flow advances to step S10 to output a "test operation signal by cooling" (cooling operation by refrigeration cycle) to the indoor unit 5a.

If "abnormal output" (No) is determined based on the result of the test operation obtained from the indoor unit 5a in step S11, the flow proceeds to step S12, where the supply of hot water is stopped, and then "abnormal cooling and heating" (test operation). (Abnormal) is displayed and the program returns to the main program.

"Normal output" in step S11 (Yes)
Is determined, the process proceeds to step S13 to display "end of test run", and then returns to the main program.

FIG. 5 is a flowchart showing the test operation of the indoor unit 5a, which is a subroutine that forms part of a main program for controlling the operation of the indoor unit 5a, and returns to the main program via "R". .

In step S21, step S22, and step S23, it is determined whether the test operation signal transmitted from the hot water supply source 3 is "test operation by hot water heating", "test operation by heat pump heating", or "test operation by cooling". When the "test run by hot water heating" is determined in step S21, the opening of the variable flow rate valve 14a is opened to a predetermined opening with respect to the full opening in step S24 to enable circulation of hot water to the hot water heat exchanger 13a. At this time, the direction of the conditioned air discharged from the indoor unit 5a is fixed to a predetermined direction, and the blowing amount is set to the maximum.

Next, in step S25, the hot water heat exchanger 1
It is determined whether or not the temperature of the hot water heat exchanger 13a has become equal to or higher than T0. If the temperature of the hot water heat exchanger 13a has become equal to or higher than T0, a signal indicating the end of the test run (normal end) is output in step S26. To send to.

The condition of step S25 is changed to step S2.
If it is not satisfied during the time set in step 7, step S2
Then, the process proceeds to step S8 to transmit a signal indicating a test run failure (abnormal display) to the hot water supply source 3.

In the series of test operation determinations, if the relationship between the opening of the flow rate variable valve 14a, the value of the temperature T0, and the time measured in step S27 is normal, the temperature of the hot water heat exchanger 13a is determined to be normal during this time. The opening degree of the variable flow rate valve 14a is set so that the temperature is sufficiently T0 or more. The temperature of the hot water supplied from the hot water supply source 3, the hot water heat exchanger 13
This is set based on the capacity of a and the like.

If it is determined in step S22 that "test operation using heating by heating" has been performed, the four-way switching valve 18 is switched to the heating operation side in step S29. At this time, the direction of the conditioned air discharged from the indoor unit 5a is fixed to a predetermined direction, the blowing amount is set to the maximum, and the compressor 17
The operating capacity of is the rated capacity.

Next, in step S30, it is determined whether or not the temperature of the hot water heat exchanger minus the room temperature has exceeded T1 (whether the hot water heat exchanger has been heated to a predetermined value or more by the refrigerant heat exchanger). If the temperature difference is equal to or greater than T1, step S
At 31, a signal indicating the end of test run (normal end) is transmitted to the hot water supply source 3.

The condition of step S30 is changed to step S3
If it is not satisfied during the time set in step 2, step S3
Then, a signal indicating a test run failure (abnormal display) is transmitted to the hot water supply source 3.

In the series of test operation determinations, the relationship between the operating capacity of the compressor 17, the value of the temperature T1, and the time measured in step S32 indicates that the temperature of the hot water heat exchanger 22 is normal during this time. Compressor 17
Is set based on the operating capacity (can be set arbitrarily, not limited to the rated capacity), the capacity of the refrigerant heat exchanger 22, and the like.

When the "test operation by cooling" is determined in step S23, it is first determined in step S34 whether the temperature of the hot water heat exchanger 13a is equal to or higher than T2, and when this condition is not satisfied, the flow proceeds to step S29. Proceed and perform "test operation by heapon operation".

In step S34, the outside air temperature detected by the outside air temperature sensor 67 may be used instead of the temperature of the hot water heat exchanger 13a (either the temperature of the hot water heat exchanger or the outside air temperature). May be used when the conditions are met).

It is also possible to use the room temperature or the temperature of the refrigerant heat exchanger 22. Temperature T2 is the value of hot water heat exchanger 1
3a, room temperature, about 6 to 7 degrees for the refrigerant heat exchanger 22 and about 4 to 5 degrees for the outside temperature, a value at which the refrigerant heat exchanger 22 (or hot water heat exchanger) does not freeze, and the refrigeration cycle has a low load. Is set to a value that does not result in

Next, at step S35, the four-way switching valve 18
To the cooling operation side. At this time, the indoor unit 5
The direction of the conditioned air discharged from “a” is fixed to a predetermined direction, the blowing amount is set to the maximum, and the operating capacity of the compressor 17 is the rated capacity.

Next, in step S36, it is determined whether or not the temperature of the hot water heat exchanger minus the room temperature has become T3 or less (whether the hot water heat exchanger has been cooled to a predetermined value or less by the refrigerant heat exchanger). When the temperature difference becomes equal to or less than T3, step S
At 37, a signal indicating the end of the test operation (normal end) is transmitted to the hot water supply source 3.

The condition of step S36 is changed to step S3
If the condition is not satisfied during the time set in step 8, step S3
The program then proceeds to 9 and transmits a signal indicating a test run failure (abnormal display) to the hot water supply source 3.

In the series of test operation determinations, the relationship between the operating capacity of the compressor 17, the value of the temperature T3, and the time measured in step S38 indicates that the hot water heat exchanger 22 is sufficiently operated during this time if it is normal. The cooling capacity is set based on the operating capacity (can be set arbitrarily without limitation to the rated capacity) of the compressor 17 and the capacity of the refrigerant heat exchanger 22 so as to be cooled.

In the control device configured as described above, when performing the test operation by the cooling, when the test operation of the cooling is difficult such as in winter, the test operation in the refrigeration cycle by the heat pump heating is automatically performed instead of the test operation of the cooling. You. At this time, a signal indicating the normal end of the cooling test run is transmitted to the side requesting the test run.

It is sufficient that the refrigeration cycle operates normally when the test operation of the cooling operation is performed. Similarly, if the test operation of the heapon heating is completed normally, the refrigeration cycle is also operating normally. Under environmental conditions that cannot be performed, even if the test operation is changed to the heating operation of the heapon, the same effect as that obtained when the cooling test operation is substantially completed can be obtained.

[0074]

As described above, in the control apparatus for an air conditioner of the present invention, when performing a test run by cooling, a test run by heating is replaced by a test run by heating under an environmental condition in which cooling operation cannot be performed. By doing so, the cooling test operation can be substantially ended, and the test operation abnormality due to the inability to execute the test operation can be avoided.

[0075]

[Brief description of the drawings]

[0076]

FIG. 1 is an explanatory diagram showing a refrigeration cycle and a hot water circuit of the present invention.

[0077]

FIG. 2 is a block diagram showing control of the indoor unit shown in FIG.

[0078]

FIG. 3 is a block diagram showing control of the outdoor unit shown in FIG.

[0079]

FIG. 4 is a flowchart showing the operation of the present invention.

[0080]

FIG. 5 is a flowchart showing the operation of the present invention.

[0081]

[Explanation of symbols]

 5a Indoor unit 8 Outdoor unit 13a Hot water heat exchanger 22 Indoor heat exchanger 32 Microcomputer

 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Koichi Saruhashi 2-5-5 Keihanhondori, Moriguchi-shi, Osaka F-term in Sanyo Electric Co., Ltd. 3L060 AA01 AA04 CC02 CC03 CC04 DD01 DD06 EE01 EE31

Claims (9)

[Claims] 1. A refrigeration cycle is configured using a compressor, a heat source side heat exchanger, a pressure reducing device, a use side heat exchanger, and a four-way switching valve, and the four-way switching valve causes the use side heat exchanger to function as an evaporator. In the control device of the air conditioner configured to enable the cooling operation or the heating operation in which the use-side heat exchanger acts as a condenser, whether or not the cooling operation is possible from the environmental condition when the test operation in the cooling operation is selected. The control device for an air conditioner, further comprising: a control device that determines a cooling operation and performs a test operation by a heating operation when the cooling operation is impossible. 2. The air conditioner according to claim 1, wherein the environmental condition determines that the cooling operation cannot be performed when the temperature of the use side heat exchanger acting as an evaporator during the cooling operation is lower than a predetermined value. Harmonizer control device. 3. An environmental condition for judging that cooling operation is impossible when an outside air temperature is lower than a predetermined value.
3. The control device for an air conditioner according to claim 1. 4. The control device for an air conditioner according to claim 1, wherein the environmental condition determines that the cooling operation cannot be performed when the room temperature is equal to or lower than a predetermined value. 5. A refrigeration cycle is constituted by using a compressor, a heat source side heat exchanger, a pressure reducing device, a use side heat exchanger, and a four-way switching valve, and the four-way switching valve causes the use side heat exchanger to function as an evaporator. A cooling operation or a heating operation in which the use-side heat exchanger acts as a condenser is configured to be possible, and a hot water circuit that circulates hot water between a hot water supply source and a hot water heat exchanger is provided, and air in the conditioned room is provided. In a control unit of an air conditioner comprising the use-side heat exchanger and the hot water heat exchanger arranged in order from the windward in a single unit circulating, using hot water supplied through a hot water circuit. After performing the test operation of the heating operation, when performing the test operation of the cooling operation in which the use side heat exchanger acts as an evaporator, it is determined whether or not the cooling operation is possible from the environmental conditions, and the cooling operation is not possible. At that time, a trial run by heating operation is performed. A control device for an air conditioner, comprising: 6. The air according to claim 5, wherein the environmental condition determines that the cooling operation cannot be performed when the temperature of the use side heat exchanger acting as an evaporator during the cooling operation is equal to or lower than a predetermined value. Harmonizer control device. 7. The control device for an air conditioner according to claim 5, wherein the environmental condition determines that the cooling operation cannot be performed when the outside air temperature is equal to or lower than a predetermined value during the cooling operation. 8. The control device for an air conditioner according to claim 5, wherein the environmental condition determines that the cooling operation cannot be performed when the room temperature is equal to or lower than a predetermined value. 9. The environmental condition is to judge that the cooling operation cannot be performed when the temperature of the hot water heat exchanger disposed on the lee side of the use side heat exchanger acting as an evaporator during the cooling operation is lower than a predetermined value. The control device for an air conditioner according to claim 5, wherein