KR940007182B1 - Apparatus for controlling air conditioner - Google Patents

Abstract

The apparatus for controlling an air conditioner comprises a select circuit for selecting either a temperature adjusting mode which determines a heating state of a heating device or a cooling state of a cooling device by a sensing temperature difference of a room temperature sensing circuit, or a manual mode which determines the heating state or the cooling state only by an operating state of the room temperature setting circuit, thereby easily checking an operating state.

Description

Control Unit of Air Conditioner

1 is a block diagram showing the functional configuration of a control apparatus for a gas hot air heater according to an embodiment of the present invention.

2 is a perspective view showing the front surface of the gas hot air heater of this embodiment.

Figure 3 is a perspective view of the back of the gas hot air heater of the present embodiment.

4 is a configuration diagram showing a schematic configuration of the gas warm air heater of this embodiment.

5 is a partial front view of a gas warm air heater showing a closed state of the damper of this embodiment.

6 is a partial front view of the gas warm air heater showing the open state of the damper of this embodiment.

Fig. 7 is a characteristic diagram showing the determination characteristic of the heating capacity in the temperature setting mode in the capability determination unit of the control device of this embodiment.

* Explanation of symbols for the main parts of the drawings

1: gas hot air heater 10: burner (heating means)

23: dummyster (room temperature detection means) 26: display device (display means)

30: control device (heater control device) 43: setting switch (room temperature setting means)

51: Connector terminal (selection means) 52: Connector terminal (inspection mode selection means)

The present invention relates to a control device for an air conditioner having a temperature setter for setting a target temperature and a display device for displaying the set temperature.

In the air conditioner, in order to obtain a suitable heating state or cooling state according to the indoor temperature, a temperature sensor for detecting the indoor temperature is provided, and the heating state of the heating means (heating amount) is based on the temperature difference between the set temperature and the detection temperature. ) Or the cooling state (cooling amount) of the cooling means is determined.

In addition, for example, in a heater equipped with a burner as a heating means, in order to obtain a safe combustion state without oxygen deficiency combustion, a proportional valve that regulates the amount of fuel gas is operated correctly to supply an appropriate amount of fuel gas. In addition, in a warm air heater, it is necessary to fine-adjust the opening degree of a closed valve in order to maintain the temperature of the heated warm air appropriately.

In addition, in the air conditioner which switches the cooling capacity by controlling the refrigerant flow rate, it is necessary to fine-tune the opening of the control valve in order to maintain the ejection temperature properly.

To this end, for example, in the case of a heater, a temperature that is unlikely to be set when a normal heating is required, in order to obtain a maximum heating amount or a minimum heating amount of the heating means conventionally regardless of the detection temperature by the temperature sensor. For example, since 26 ° C or 10 ° C is the maximum or minimum value of the set temperature by the temperature setter, when these values are set, even if the heating amount of the heating means is determined based on the detection temperature, the set temperature and the detection temperature are determined. Since the temperature difference between and is large, the minimum heating amount or the maximum heating amount is determined, and the adjustment of the opening degree of the proportional valve is made on the assumption that the proportional valve is controlled so that the minimum heating amount or the maximum heating amount can be obtained. .

On the other hand, in recent years, in the air conditioner, it is required that the width of the control amount is large from the minimum heating amount or the minimum cooling amount to the maximum heating amount or the maximum cooling amount.

However, when temperature control is performed in which the control amount is determined based on the detection temperature, the detection temperature is proliferated in accordance with the change of the indoor temperature and the control amount is likely to change accordingly. Therefore, it is fixed as an intermediate control amount between the maximum control amount and the minimum control amount. It is impossible to operate, and it is difficult to determine whether the proportional valve is driven correctly in these intermediate control amounts.

Moreover, in the air conditioner in which the width | variety of control amount, such as heating amount, was widened according to the said request, even if the opening degree of the proportional valve corresponding to a minimum control amount or a maximum control amount was obtained by performing fine adjustment, in these intermediate control amounts, In fact, it is difficult to know how the proportional valve is actually driven from the outside, and even if the driving state of the proportional valve or the like is known, it is difficult to predict whether the proportional valve is in the driving state based on what information.

An object of the present invention is to provide a control device for an air conditioner that can easily perform an inspection of an operating state or the like at the time of inspection or adjustment in a factory, or when an abnormality or the like occurs after being shipped to a product.

In order to achieve the above object, the first invention of the present invention provides room temperature setting means 43 for setting a target temperature of a room controlled by a heating means or a cooling means, and a room temperature detection means for detecting the temperature of the room ( 23. An apparatus for controlling an air conditioner having a heating apparatus comprising: a heating state of only the heating water or a cooling state of only the cooling water based on a temperature difference between a target temperature based on the room temperature setting water only and a detection temperature by the room temperature detecting means. The hot mode for determining, the manual mode for determining the heating state of the heating means or the cooling state of the cooling means only in accordance with the operating state of the room temperature setting means, and the suntec for selecting one of the manual mode and the temperature mode. The technical means is provided with a means 51, in which the operating state is controlled in accordance with the mode selected by the selection means.

The second invention of the present invention is also provided with room temperature setting means 43 for setting a target temperature in the room controlled by the heating means or the cooling means, and at least display means 26 for displaying the target temperature. In the control apparatus of an air conditioner, it is provided with the test mode selection means 52 for selecting the test mode for performing the test | inspection of an operation state, The said display means 26 is carried out, when the said test mode is not selected. The target temperature is displayed, and if the inspection mode is the selection source, the technical means for performing the inspection of the operation state is displayed by displaying the control indication value of the refilling means or the cooling means.

In the first invention of the present invention, when the manual mode is selected, the heating state or the cooling state is determined based only on the operating state, regardless of the detection temperature. Therefore, even if there is a change in the room temperature accompanying the operation of the air conditioner, the heating means or the cooling means is controlled in a constant heating state or cooling state in accordance with the operating state of the room temperature setting means.

In the second invention of the present invention, when the inspection mode is selected, the display means displays a control instruction value for heating means or cooling water only. Therefore, it is possible to easily determine whether the heating means or the cooling means is driven by the display source control instruction value.

For example, when a burner is provided as a heating means for adjusting the proportional valve for adjusting the fuel supply amount to the burner, the display source control command value and the control state of the proportional valve can be adjusted while contrasting each other. In addition, when the burner is provided with a blower, it is possible to easily check whether or not the amount of blown air by the blower corresponds to the control instruction value to the blower.

In the first invention of the present invention, the heating state of the heating means or the cooling state of the cooling means can be fixed, so that the heating state or the cooling state does not change with operation. Therefore, inspection or adjustment can be easily performed.

According to the second invention, it is easy to know how the heating means or the cooling means is controlled during the operation of the air conditioner, so that each part can be easily adjusted or inspected in response to the control state.

Next, this invention is demonstrated based on the Example of a heater.

In the stationary gas heater 1 shown in FIGS. 2 and 3, the outer casing 2 is formed of a metal plate and some members made of resin, and the outer casing 2 is formed of a plurality of inlet openings, respectively. The air inlet 3 and the inlet 4 of the combustion air are provided above the rear side, and the hot air outlet 5 for blowing the hot air is provided below the front, respectively, and the indoor air inlet 3 and the inlet ( 4) is covered with a filter 6 detachably attached to the outer casing 2.

As shown in FIG. 4, the convection duct 7 is provided in the outer casing 2, and the perfusion flow which uses the convection duct 7 as a ventilation casing near the hot air blower outlet 5 in the convection duct 7 is shown. The convection fan 8 of the type | formula is arrange | positioned, and the air inlet 4 and the hot air blower outlet 5 are respectively perverted by the upstream end and the downstream end of the convection duct 7, respectively. In addition, the convection fan 8 drives the impeller 8a disposed in the convection duct 7 by the DC motor 8b.

The hot air blower outlet 5 is provided with a damper 9 for closing a part of the hot air blower outlet 5, and rotates according to an operating state to control the blown state of the air flow passing through the convection duct 7. Here, as shown in FIG. 5, when the damper 9 closes a part of the hot air jet 5, the damper 9 closes the upper half of the hot air jet 5 and opens the hot air jet 5 when the damper 9 is opened. As shown in FIG. 6, it opens toward the outer side so that it may be in close contact with the upper end surface of the warm air jet port 5. As shown in FIG.

On the other hand, a burner 10 as a heating source is disposed on an upstream side of the convection fan 8 in the convection duct 7, and the hot combustion gas generated in the burner 10 is operated by the operation of the convection fan 8. The indoor air introduced from the indoor air inlet (3) is mixed with hot air, and is blown out from the hot air outlet (5).

In the air induction pipe 11 which guides the combustion air to the burner 10 through the intake port 4, a nozzle 13 which is a downstream end of the fuel supply path 12 for inducing fuel gas is disposed. The fuel gas blown out from (13) is introduced into the mixing chamber 14 together with the combustion air and combusted in the burner 10.

In the fuel supply passage 12, two gun valves 15 and 16 and a gas governor 17 for keeping the supply gas pressure constant are installed in order from the upstream side, and the fuel supply passage 12 includes a gas governor 17 Downstream of the main body 12a and the two bypass pipes 12b and 12c, the main pipe 12a and the two bypass pipes 12b and 12c are joined again and connected to the nozzle 13 have. The main pipe 12a is provided with a proportional valve 18 for checking the fuel gas amount, and the bypass pipe 12b is provided with a gas amount adjusting screw 19 for adjusting the minimum supply amount of fuel gas.

The bypass pipe 12c is an auxiliary fuel supply path for increasing the supply of fuel gas by a predetermined amount (for example, 15%) for rapid heating (hot desiccation) at the beginning of operation, and is open only at the beginning of operation. Bypass solenoid valve 20 is provided.

In the vicinity of the burner 10, an ignition electrode 21 for performing spark discharge for ignition and a thermocouple 22 for monitoring the combustion state of the burner 10 are provided.

In addition, the suction port 4 is provided with a dummyster 23 for detecting the room temperature.

On the upper surface of the outer casing 2 of the gas-heated air conditioner 1 having the above-described configuration, various operations described later are covered by an operation switch 24 for instructing operation start and stop and an opening / closing cover 25 made of resin. The operation display part which accommodates the several switch and the display apparatus 26 for performing the operation of this is provided, The gas-heated air heater 1 is started and stopped by the control apparatus 30 shown in FIG. Amount is controlled.

The control device 30 is composed of a microcomputer (hereinafter referred to as a "microcomputer") having various input / output circuits and a driving circuit for driving each part of the gas heater 1 by a microcomputer. The functional unit formed by the mode control unit 31, display control unit 32, setting control unit 33, operation control unit 34, capability determination unit 35, proportional valve control unit 36, fan control unit 37 And a damper control unit 38.

As an operation switch for applying an operation signal to the control device 30, in addition to the above-described operation switch 24, a display changeover switch 41, a time alignment switch 42, a setting switch 43 consisting of two switches, and two on There are timer switches 44 and 45, off timer switch 46, and economizer switch 47.

The operation purpose of each switch and the control contents of each functional unit according to the operation of each switch will be described below.

The mode control unit 31 is a function unit for setting the operation mode of the gas warm air heater 1 and the display mode of the display device 26. The mode control unit 31 connects the connector terminal 51 to the control board (not shown) in the mode control unit 31. 52) and the conduction state of the external circuits connected to the respective connector terminals 51 and 52 is changed as follows.

The connector terminal 51 has at least two connection pins, and if the pins of the connector terminals 51 are shorted by a predetermined connector or the like matched to the connector terminals 51, the mode control unit 3l is a capability determining unit. When the control unit 35 is controlled in the manual mode and the pins of the connector terminals 51 are not shorted, the capability determination unit 35 is controlled in the temperature control mode.

The mode control unit 31 switches to the temperature display mode and the time display mode according to the operation signal from the display changeover switch 41 in the temperature control mode, and is set in synchronization with the switching of each display mode. The setting mode by the switch 43 is determined.

The connector terminal 52 includes, for example, four connection pins, and the mode control unit 31 shorts each pin of the connector terminal 52 by a predetermined connector or the like matched to the connector terminal 52. The display control unit 32 is controlled to the inspection mode in accordance with the short circuit state of the connecting piece.

In this case, the connector matched to the connector terminal 52 is provided with a switching switch for closing a predetermined short circuit between each pin in advance, so that the required inspection mode can be easily selected.

The display control unit 32 selects the display contents of the display device 26 in accordance with the control state of the mode control unit 31, and simultaneously displays the selected display contents as follows.

In the present embodiment, as the display device 26, an LED composed of seven segments of four digits is mounted, and the letters corresponding to the numbers "0" to "9" and the letters "A" to "F" are represented. Display.

In the case of the temperature mode, the temperature display mode and the time display mode are switched in accordance with the switching signal from the display changeover switch 41, and in the temperature display mode, the set temperature and the detection temperature are transferred to the time alignment switch 42 in the time display mode. The present time and the present time or the set time are selected respectively.

In the manual mode, the setting switch 43 displays the capability level corresponding to each heating capability in accordance with the selection source heating capability.

In the case of the inspection mode, according to the short-circuit state of each funnel of the connector terminal 52, for example, the detection temperature by the dummyster 23, the control instruction value to the convection fan 8, the proportional valve 18 Control command value, the correction value to the convection fan 8 by the variable resistors 37a and 3cloth described later, the correction value to the proportional valve 189 by the variable resistor 36a, the output of the thermocouple 22, the timer The setting time and the like are displayed in accordance with the operation of each switch installed in the operation display unit.

In addition, the display device 26 includes LEDs indicating operation, combustion or hot desiccation, other selection states of the time alignment switch 42, operation states of the respective timer switches 44 to 46 and the saving operation switch 47. LEDs which display respectively, and LEDs which flicker when a blockage of the filter 6 is detected by a filter switch (not shown) are provided.

The setting control section 33 is a function section for controlling the setting contents by the setting switch 43 according to the setting mode. In the temperature control mode, the setting control section 33 selects the display mode selected by the display switching switch 41 in the temperature display mode. The set temperature is set, and the time selected by the time alignment switch 42 is set in the time mode.

The set temperature to be set includes "L (equivalent to about 10 ° C)", "16", "l8", ..., "26", "H (for continuous steel operation)" and 8 steps every 2 ° C. .

In addition, the setting controller 33 has a lock function for mainly fixing (locking) the set temperature, and when the two setting switches 43 are operated at the same time and their operation time is continued for 0.5 seconds or more, The temperature and the like are fixed, and the lock lamp of the display device 26 indicates that the lamp is being fixed.

When the set temperature is fixed, the set temperature is not changed even when one of the set switches 43 is operated. In addition, when the set temperature is fixed, the operation switch 24 and each timer switch also in regard to operation control. The operation for starting the operation by (44 to 46) is not accepted. In addition, if the setting switch 43 is continuously operated for two seconds or more during the fixing, the fixing is released, and the operation of each switch is received again.

The operation control unit 34 performs operation start control in a predetermined sequence according to the operation signal of the operation switch 24, starts the ignition control rule of the burner 10, and operates the operation switch 24 during combustion. Operation stop control is performed in accordance with the signal to perform predetermined fire control.

In the ignition control, the ignition detection by the thermocouple 22 is performed, and the ignition detection state is determined when the output voltage of the thermocouple 22 reaches a predetermined voltage or more. During combustion, it is judged whether or not it is settled combustion and whether or not the output voltage of the thermocouple 22 is equal to or higher than a predetermined voltage.

In this embodiment, 10 mV is the reference voltage when the heating capacity determined by the capacity determining unit 35 to be described later is less than or equal to 2, and 14 mV is the reference voltage when the heating capacity is 3 to 8 levels. Thus, the output voltage of the thermocouple 22 is compared with the reference voltage, and if it does not reach the reference voltage at this time, it is determined as an oxygen depleted combustion state or a misfired state and fire extinguishing control is performed.

Again, in this embodiment, a timer 34a having a clock function is provided, and operation control is performed not only in accordance with the operation of the operation switch 24 but also by the operation of each timer switch 44 to 46.

When each of the on timer switches 44 and 45 is operated, even if the indoor temperature reaches the set temperature at the set source setting time, the operation start operation is performed in advance of the time earlier than the set time. Is done.

When the off timer switch 46 is operated, the operation start control is performed simultaneously with the operation of the off timer switch 46 even if the operation start operation by the operation switch 24 is not performed.

In this case, when the operation is performed by the timer switches 44 to 46, the predetermined time (for example, 60 minutes) is set as the operation duration time, and the timer 34a is operated, and automatically passes after the predetermined time has elapsed. Operation stop is performed to end the operation.

In addition, after the off-timer switch 46 is operated once, the timer 34 is reset in the case of the operator again, and the operation continues for a predetermined time thereafter.

On the other hand, each set time for the timer operation control to be performed in accordance with each of the on timer switches 44 and 45 is stored in a storage device which is attached to the timer 34a, and is set by the time alignment switch 42. It is stored in each memory device selected in correspondence with the on timer switches 44 and 45, respectively.

When the above fixing is performed in the driving control unit 34, the operation for starting the operation by the driving switch 24 and the timer switches 44 to 45 is not accepted.

Therefore, only operation for stopping operation by the operation switch 24 is accepted when it is fixed during operation, and timer operation control by on-timer switches 44 and 45 is performed when being fixed during operation stop. Only in this case, operation starts before the set time, and when the timer operation control is not performed, the operation is not started at all unless the release is performed.

In the start operation control, the ignition operation of the burner 10 is performed after the prepurge is performed for 3 seconds, and in the operation stop control, the post purge is performed for 20 seconds after the fire extinguishing operation of the burner 10 is performed.

The capacity determining unit 35 determines the heating capacity, which is a reference for determining the combustion amount of the burner 10 and the applied voltage of the convection fan 8, according to the operation of the setting switch 43.

In this embodiment, eight stages from the level 1, which is the weakest heating capacity, to the cone level 8, are set in advance as heating capacity, and in the case of the temperature control mode, as shown in FIG. The heating capacity is determined from the temperature difference between the set temperature by the switch 43 and the detection temperature by the dummyster 23. When the temperature is set to "L" or "H" as the set temperature, the heating capacity is equal to the detection temperature. Regardless, it is determined to be level 8 or level 1, respectively.

In the manual mode, the heating capacity is selected in accordance with the operation of the setting switch 43 irrespective of the detection temperature of the dummyster 22.

In addition, the capacity determining unit 35 is provided with a saving operation switch 47 for preventing excessive heating according to the user's wishes. When the saving operation switch 47 is operated during operation, the saving operation lamp (not shown) At the same time, after the detection temperature by the dummyster 22 reaches the set temperature, for example, every 30 minutes elapses, the set temperature is changed as low as 1 ° C.

In this case, when the indoor heating is sufficiently performed with respect to the set temperature, the actual set temperature gradually decreases with respect to the apparent set temperature, so that the user does not need to change the set temperature newly. Consumption can be suppressed.

At the beginning of the operation, in order to facilitate ignition of the burner 10, when level 4 is determined and ignition is detected, the level 8 is determined for a predetermined time (15 minutes) thereafter, and the bias solenoid valve ( 20) is opened at the same time, rapid heating (hot desiccation) operation is performed, and after a predetermined time elapses, the rapid heating operation is terminated, and the heating capacity is determined based on the actual temperature and the detection temperature of the dummy 23. .

The proportional control unit 36 drives and controls the proportional valve 18 according to the heating capacity determined by the capability determining unit 35.

Here, in order to ensure that the current value corresponding to the determined heating capacity is surely energized, a variable resistor 36a that is adjusted by manual operation is provided, and the heating capacity determined by the correction value applied by the variable resistor 36a is synthesized. The proportional valve 18 is driven based on the value.

The fan control unit 37 drives the convection fan 8 in accordance with the heating capacity determined by the capacity determination unit 35. Here, in order to drive at a rotational speed corresponding to the determined heating capacity, the variable resistors 37a and 37b adjusted by manual operation are provided, and in the case of the determined heating capacity levels 1 and 2, they are applied by the variable resistor 37a. The voltage is applied based on the correction value and the determined heating capacity based on the synthesis source control value. In the case of levels 3 to 8, the voltage is applied based on the correction value applied by the variable resistor 37b and the control value to which the determined heating capacity is synthesized. It is applied to the motor of the convection fan 8.

As a result, even if there is a nonuniformity in the motor of the convection fan 8, an appropriate voltage corresponding to the control value is applied to obtain the optimum rotation speed from the high rotation speed to the low rotation speed corresponding to each level. Appropriate air is circulated with respect to the heating amount to ensure a comfortable hot air temperature and warm air amount for the user.

The damper control unit 38 is a function unit for driving control of the geared motor 9a provided in the damper 9, and the capacity is determined in accordance with the control state of the driving control unit 34 at the start and stop of operation. Each is controlled according to the heating capacity determined by the unit 35.

Here, it is controlled in the closed state at the beginning of the operation, and the opening area of the hot air jet port 5 is small. For this reason, since the heating capacity determined by the capability determination unit 35 is level 4 and fuel gas is supplied accordingly, the supply amount of combustion air is relatively reduced, so that the mixer becomes gas rich (rich) and ignites. Becomes easy.

The damper 9 is opened in response to metal heating within a predetermined time after the burning of the burner 10 is detected.

The damper 9 is always in a closed state at level 1 and always in an open state at level 3 or more, depending on the heating capacity determined by the capacity determining unit 35 after the metal heating is completed.

In addition, in level 2, when the heating capacity changes from the level 3 or more state to level 2, it remains as it is, and when the heating capacity changes from level 1 to level 2, it maintains the closed state as it is.

On the other hand, in the post purge which is the operation stop control, it is kept in an open state, and the amount of air passing through the convection duct 7 is increased to enable rapid cooling of the burner 10 and the convection duct 7, and post purge is performed. When it finishes, it is closed.

As a result, when the ignition operation is performed, there is no need to put it in the closed state again, and the operation starting operation such as prepurge can be started quickly.

Here, in the open state and the closed state of the damper 9, each state is detected by a position sensor 9b composed of two micro switches provided in the drive unit of the geared motor 9a, and the control indication value and the position sensor 9b. The geared motor 9a is driven when the detected state is different, and the geared motor 9a is not driven when the control command value and the detected state match.

In addition, a foreign material or the like may be mixed between the damper 9 and the hot air blower outlet 5 so that the damper 9 may not be in a correct position. For this reason, in order to protect the geared motor 9a, the damper 9, etc., the drive time of the geared motor 9a is limited to a maximum of 20 seconds, and no more drive is performed.

In the present embodiment, when the damper 9 is lit, the state change is usually completed in 5 to 5 seconds.

The gas-heated air conditioner 1 of the present embodiment having the above configuration can fix the heating capacity by shorting the connector terminal 51, so that even if the room temperature changes, adjustment or inspection is not effected. I can do it.

In this embodiment, the control terminal value of the proportional valve 18 or the convection fan 8 or the respective correction values can be displayed by shorting the connector terminal 52, so that the inspection of the operation state can be easily performed. I can do it.

Moreover, since the damper 9 is provided, the blowing amount corresponding to each combustion amount from the small combustion amount to the large combustion amount is obtained, and as a result, the warm air of a stable temperature can be blown off.

In this embodiment, the test mode and the like can be selected by shorting the two connection terminals. However, the test mode may be selected by an operation switch or a combination of operation switches provided in the heater.

In addition, in the present embodiment, it is shown that the required mode is selected by the provided circle selector switch on the connector that matches the connector terminal 52, but each time the operation switch such as the economizer switch mounted on the heater is operated, The mode may be switched. At this time, the order of switching by operation of the display switching switch 41 may be reversed.

In the present embodiment, a hot air heater is shown in which the combustion gas is mixed with the actual cooling air to blow the indoor air. (FF type) A warm air heater may be used. The fuel may be oil. Moreover, the cooling gear which blows cold air indoor may be sufficient, In this case, as a method of changing a cooling state, the rotation speed of a convection fan may be controlled. It may also be a fan for controlling the rotation speed of the refrigerant compressor.

Claims (2)

In a control apparatus of an air conditioner, comprising a room temperature setting means 43 for setting a target temperature of a room controlled by a heating means or a cooling means, and a room temperature detection means 23 for detecting the temperature of the room. A temperature mode for determining a heating state of the heating means or a cooling state of the cooling means on the basis of a temperature difference between a target temperature by the room temperature determination means and a detection temperature only by the room temperature detection number, and an operating state of the room temperature setting means. A manual mode for determining the heating state of the heating means or the cooling state of the cooling means only, and selection means 51 for selecting one of the manual mode and the temperature mode. Control device of the air conditioner, characterized in that the operating state is controlled according to the selected mode. A control apparatus for an air conditioner, comprising: a room temperature setting means 43 for setting a target temperature in a room controlled by a heating means or a cooling means; and at least a display means 26 for displaying the target temperature. And an inspection mode selecting means 52 for selecting an inspection mode for conducting inspection of an operation state, and when the inspection mode is not selected on the display means 26, the target temperature is displayed, and the inspection And when the mode is selected, the control indicator of the heating means or cooling means is displayed so that the inspection of the operation state can be performed.