JP3145158B2 - Temperature controller - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention selectively controls a cooling operation for operating a compressor when a temperature detected by a temperature sensor exceeds a predetermined temperature, and a heating operation for operating the compressor when the temperature falls below a predetermined temperature. The present invention relates to a temperature control device that can be used and controls a temperature near a set temperature.

[0002]

2. Description of the Related Art Conventionally, in this type of apparatus, setting of an off-point set temperature and an on / off temperature difference of a compressor, switching of a cooling / heating switch or switching of an output contact (a contact is set to b
Contact) to perform temperature control during cooling and during heating. Then, the ON temperature is determined by an OFF point set temperature + an ON / OFF temperature difference in the case of the cooling setting, and the OFF point set temperature−the ON / OFF temperature difference in the case of the heating setting. There is a method in which the point set temperature is set to the on temperature, and the off temperature is determined by the difference between the off point set temperature and the on / off temperature.

[0003]

As described above, conventionally, switching between cooling and heating is performed by a switch method or a reverse contact method of an output contact. When either one is used, the switching between the cooling and the heating is performed normally, but when both the switchings are used, the reverse is reversed, the original is left as it is, and confusion occurs for the user performing the setting. It was often.

Accordingly, the present invention has been made in view of the above-mentioned conventional problems, and provides a temperature control device which eliminates the necessity of manually setting cooling and heating separately and which can eliminate confusion caused by the manual setting operation. That is the task.

[0005]

In order to solve the above-mentioned problems, a temperature control device according to the present invention comprises a display 12 which constantly displays the present temperature as shown in the basic configuration diagram of FIG.
Storage means 20c1 and 20c2 for rewritably storing the OFF-point set temperature and the ON-point set temperature;
Setting temperature changing means 20d for changing the OFF point setting temperature and the ON point setting temperature stored in 0c1 and 20c2
A display control means 20e for temporarily displaying the set temperature to be changed on the display during the setting temperature changing operation by the set temperature changing means 20d; and a magnitude of the off-point set temperature and the on-point set temperature. And a cooling / heating setting means 20f for setting a difference between cooling and heating.

The set temperature changing means 20d includes means 20d1 for simultaneously changing the other set temperature in the same direction by the same amount when one of the preset off-point set temperature or on-point set temperature is changed by the means. Features.

[0007]

In the above arrangement, the set temperature changing means changes the off-point set temperature and the on-point set temperature stored in the storage means in a rewritable manner, and changes the set temperature by the set temperature changing means. Temporarily during the operation, the display control means 20e displays the set temperature to be changed on the display 12 which constantly displays the current temperature.
The set temperature can be confirmed by the display on the display 12 during the changing operation. In addition, the cooling / heating setting means 20f automatically sets the cooling and heating according to the magnitude of the off-point set temperature and the on-point set temperature stored in the storage means 20c1 and 20c2. It is not necessary to set another type of heating, and confusion caused by manual setting can be prevented.

Also, the means 20d1 of the set temperature changing means 20d simultaneously changes the other set temperature in the same direction by the same amount when one of the preset off-point set temperature or the on-point set temperature is changed. When one of the set temperature or the ON point set temperature is changed, the other set temperature is automatically set, and the OFF point set temperature and ON point set temperature can be set separately. However, the setting work is reduced.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 2 is a schematic external view showing an embodiment of a temperature control device according to the present invention. In FIG. 2, reference numeral 11 denotes a case in which an electric circuit of the device is housed, and a liquid crystal display ( A display 12 such as an LCD (LCD) and an operation unit 13 are provided. The display 12 has a temperature display section 12a for digital display of 3 digits of 7 segments, a setting display section 12b for displaying "SET", "OFF", and "ON" at the time of temperature setting, and "OFF" at the time of operation. , "O
An operation display section 12c for displaying the lighting of "N" and a decimal display section 12d for displaying the lighting of ".5" are provided. The operation unit 13 includes a function switch operation button 13a, an up switch operation button 13b, and a down switch operation button 13c.

FIG. 3 is a diagram showing a configuration of an electric circuit accommodated in the case 11. In FIG. 3, reference numeral 20 denotes a microcomputer which is supplied with a constant voltage from a power supply circuit 21 and operates according to a predetermined control program. (CP
U), the CPU 20 includes a temperature sensor 22 for detecting the temperature of the space whose temperature is being adjusted, and the operation unit 13.
Function switch 131 and up switch 1 which are turned on by operating the operation buttons 13a to 13c, respectively.
32, the down switch 133, the display 12,
A non-volatile memory 23 composed of an E ² PROM capable of holding stored contents without a backup power supply and an output relay circuit 24 are connected.

The CPU 20 includes an A / D conversion circuit 20a for converting a temperature detection signal input from the temperature sensor 21 into a digital signal, and a ROM 2 storing the control program.
0b and a ROM 20c for storing various data generated in the course of signal processing.

The 7-segment display section 12 of the display 12
In a, the current temperature detected by the temperature sensor 22 is always displayed. The non-volatile memory 23, which can retain the stored contents even if the power is turned off due to a power failure or the like, stores an off-point set temperature, an on-point set temperature, and an on / off temperature difference that is a difference between these temperatures. Is done. Output relay circuit 2
4 is an on / off output for starting and stopping the compressor,
It has a cooling / heating switching output for outputting a switching signal for turning on / off an electromagnetic valve for switching a refrigerant circuit between a cooling operation and a heating operation.

The CPU 20 determines that the cooling operation is performed when the ON point set temperature is set higher than the OFF point set temperature, and determines that the heating operation is performed when the ON point set temperature is set lower than the OFF point set temperature. A switching signal is output to the cooling / heating switching output, and a difference between the two temperatures is set as an on / off temperature difference, and an ON / OFF signal is output to the ON / OFF output according to the current temperature during each operation to start / stop the compressor.

When the operation button 13a of the function switch 131 is turned on, the off-point set temperature blinks on the 7-segment display section 12a of the display 12 which has been displaying the detected temperature, and the setting display section 12b
"SET" and "OFF" are displayed. The operation button 1 of the function switch 131 is again displayed during the blinking display.
When the 3a is turned on, the ON-point set temperature is blinked on the 7-segment display section 12a of the display 12, and "SET" and "ON" on the setting display section 12b are lit. Therefore, the operation button 1 of the function switch 131
Each set temperature can be confirmed by repeating the ON operation of 3a. The blinking display is continued for a fixed time of, for example, 3 seconds after the operation of the operation button 13a of the function switch 131 is stopped, and then returns to the display of the original current temperature.

The operating button 13a of the function switch 131 is turned on to display the off-point set temperature on the 7-segment display section 12a of the display 12 which has been displaying the detected temperature up to that time, and the setting display section 12b "S
In a state where "ET" and "OFF" are lit and displayed, the operation button 13a of the function switch 131 is continuously pressed and the operation buttons 13b and 13c of the up switch 132 or the down switch 133 are turned on, so that the display unit 12 is turned on.
The off-point set temperature indicated by a can be changed. When the operation button 13a of the function switch 131 is released when the desired off-point set temperature is reached, the off-point set temperature displayed on the display unit 12a is stored in the nonvolatile memory 23. The temperature flashes for 3 seconds.

The details of the operation outlined above are described in the CPU 2
FIG. 4 shows work performed according to a predetermined program 0
This will be described below with reference to the main flowchart of FIG. CP
U20 starts operation in response to power-on, and performs an initializing process for setting various initial values in the first step S1. In this initialization process, an area 20c1 to 20c3 for storing an off-point set temperature, an on-point set temperature, and an on-off temperature difference as shown in FIG. Area 20c4, pointer area 20c5, switch input present, function switch IN, setting, switch checking, switch pressing, flags 20c6 to 20c11 during automatic return timer
Is set to the initial value.

Thereafter, the process proceeds to step S2, where a switch process is performed. In this switch processing, as shown in the flowchart of FIG. 6, it is determined whether or not the switch input flag is set in step S2a.
When this determination is NO, the process returns to the original main flowchart. If the determination in step S2a is YES, the process proceeds to step S2b to reset the switch input presence flag, and then proceeds to step S2c, where it is determined whether the function switch 131 is on. If the determination in step S2c is NO, step S2d
To determine whether or not the up switch 132 is on. If the determination in step S2d is NO, the process proceeds to step S2e to determine whether or not the down switch 133 is on, and determines in step S2e. NO
In the case of, the process returns to the main flowchart.

If the determination in step S2c is YES, the process proceeds to step S2f, in which the function switch I
After setting the N flag, the process proceeds to step S2g, where the function switch process is performed, and then the process returns to the main flowchart. When the determination in step S2d is YES, the process proceeds to step S2h to perform an up switch process, and when the determination in step S2e is YES, the process proceeds to step S2i to perform a down switch process and returns to the main flowchart. The details of the function switch processing 2g, the up switch processing 2h, and the down switch processing 2i will be described later.

After the switch process in step S2, the process proceeds to step S3 to perform a timer process. In this timer process, as shown in the flowchart of FIG. 7, it is determined in step S3a whether or not the automatic return timer flag is set. If the determination in step S3a is NO, the process returns to the main flowchart. Step S3a
When the determination in step S3b is YES, the process proceeds to step S3b to determine whether or not the function switch IN flag is set. When the determination in step S3b is YES, the process returns to the main flowchart, and when the determination is NO, the process proceeds to step S3c. In step S3c, the timer counts down, and then proceeds to step S3d to determine whether there is a borrow output. This step S3
When the determination of d is YES, the process proceeds to step S3e to reset the flag during the automatic return timer, and then proceeds to step S3e.
After resetting the setting flag in f, the process returns to the main flowchart. If the determination in step S3d is NO, the process returns to the main flowchart.

After the timer process in step S3, the process proceeds to step S4 through various steps, where a display switching process is performed. In this display switching process, as shown in the flowchart of FIG. 8, it is determined whether or not the setting flag is set in step S4a. If the determination in step S4a is NO, the process proceeds to step S4b to display the current temperature on the display. Then, the display is returned to the display section 12a of FIG. If the determination in step S4a is YES, the process proceeds to step S4c to determine whether or not the content of the pointer is "3".
If the determination is YES, the process proceeds to step S4d to display the off-point set temperature on the display section 12a of the display 12, and then returns to the main flowchart. When the determination in step S4c is NO, the process proceeds to step S4e to determine whether or not the content of the pointer is "2".
When the determination at 4e is YES, the on-point set temperature is displayed on the display section 12a of the display 12, and then the process returns to the main flowchart. When the determination in step S4e is NO, other processing is performed, and the process returns to the main flowchart.

In the process of steps S2 to S4, a timer interrupt process S5 is performed at regular intervals. In this timer interrupt processing S5, as shown in the flowchart of FIG. 9, it is determined whether or not the switch-pressing flag is set in step S5a, and if the determination in step S5a is YES, the process proceeds to step S5b to increase. Then, it is determined whether the down switch has not been pressed for a while, and it is determined that neither the up switch nor the down switch has been pressed. If the determination in step S5b is YES, the process proceeds to step S5c to reset the switch pressing flag, and then proceeds to step S5d. If the determination in step S5b is NO, step S5c is skipped and the process proceeds to step S5d. Step S5
In d, it is determined whether or not the function switch has been pressed for a while. If the determination in step S5d is NO, the process returns to the main flowchart. If the determination is YES, the process proceeds to step S5e to reset the function switch IN flag. And the next step S
At 5f, a setting value memory process for writing the setting value to the nonvolatile memory 23 is performed, and then the process returns to the main flowchart.

If the determination in step S5a is NO, the process proceeds to step S5g, where it is determined whether the switch check flag is set. If the determination is YES, the process proceeds to step S5h to determine whether the same switch has been pressed for a while. Determine whether or not. If the determination in step S5h is YES, the process proceeds to step S5i to set a switch input presence flag, proceeds to the next step S5g, sets switch data in a predetermined area of the RAM 20c, and further proceeds to the next step S5k. After the pressing flag is set, the process proceeds to step S5m. If the determination in step S5h is YES, steps S5i to S5k are skipped and the process proceeds to step S5m, where the switch check flag is reset, and the process returns to the main flowchart.

If the determination in step S5g is NO, the process proceeds to step S5n, where it is determined whether or not the switch is pressed. If the determination is YES, step S5n is performed.
Proceeding to 5p, it is determined whether the switch is a valid switch. If the determination in step S5p is YES, the process proceeds to step S5q to set a switch check flag. In the next step S5r, the switch input is stored once and the process returns to the main flowchart. On the other hand, if the determinations in steps S5n and S5p are NO, step S5
Skip q and S5r and return to the main flowchart.

Next, details of the function switch processing in step S2g will be described. In this function switch process, as shown in FIG. 10, it is determined whether or not the setting flag is set in step S2g1, and if this step S2g1 is YES, the process proceeds to step S2g2, where the pointer is decremented by one, and then step S2g3 To determine whether there is a borrow output. If the determination in step S2g3 is YES, the process proceeds to step S2g4 to reset the setting flag, and then returns to the main flowchart.

If the determination in step S2g1 is NO, the flow advances to step S2g5 to set the setting flag, and then to step S2g6, where "3" is set in the pointer. Thereafter, the flow proceeds to step S2g7, sets the flag during the automatic return timer, and returns to the main flowchart.

The details of the up-switch process in step S2h will be described. In this up switch process, it is determined whether or not the setting flag is set in step S2h1. If the determination in step S2h1 is NO, the process immediately returns to the main flowchart, and if the determination is YES, the process proceeds to step S2h2. It is determined whether the function switch IN flag is set or not. If this determination is NO, the process returns to the main flowchart.

If the determination in step S2h2 is YES and the function switch IN flag is set, the flow advances to step S2h3 to determine whether or not the content of the pointer is "3". When the determination in step S2h3 is YES, the process proceeds to step S2h4 to determine whether the off-point set temperature is equal to or lower than a predetermined upper limit temperature. When the determination in step S2h4 is NO, the process returns to the main flowchart.
Proceed to 2h5. In step S2h5, the off-point set temperature is increased by 1 ° C., and then the process proceeds to step S2h6, where the on-point set temperature is increased by 1 ° C., and the process returns to the main flowchart.

When the determination in step S2h3 is NO, the process proceeds to step S2h7, where it is determined whether or not the content of the pointer is "2". This step S2h7
If the determination is YES, the process proceeds to step S2h8 to determine whether or not the on-point set temperature is equal to or lower than a predetermined upper limit temperature. When the determination in step S2h8 is NO, the process returns to the main flowchart, and when the determination is YES, the process proceeds to step S2h9. In step S2h9, the on-point set temperature is raised by 1 ° C., and then in step S2h10.
To calculate the ON / OFF temperature difference from the absolute value of the difference between the OFF point set temperature and the ON point set temperature. Then, step S2h1
The process proceeds to step 1, where the cooling operation and the heating operation are determined based on the level of the off-point set temperature and the on-point set temperature, and then the process returns to the main flowchart. In the above determination, cooling is determined when the off point is smaller than the on point, and heating is determined when the off point is greater than the on point. When the determination in step S2h7 is NO, other processing is performed, and then the process returns to the main flowchart.

The down switch process in step S2i is performed by executing the same flowchart as the above up switch process, and the "lower limit temperature" and "lower limit temperature" in steps S2h4 and S2h8 in the flowchart of FIG. And step S2h
5, S2h6 and S2h9 “1 ° C up” to “1 °
This is performed according to the flowchart changed to “C down”.

As is clear from the flowchart described above, when none of the function switch 131, the up switch 132, and the down switch 133 is turned on, the determination in step S2a in the flowchart of FIG. The process proceeds to step S3a in the flowchart of FIG. The determination in step S3a is also N
O and proceeds to the flowchart of FIG.
Since the determination at 4a is NO, the current temperature is displayed on the display unit 12a of the display unit 12 at step S4b. In the course of the above-described operation, the timer interrupt processing of the flowchart of FIG. 9 is performed. However, the determinations in steps S5a, S5g, and S5n are NO, and the processing is merely skipped.

When the operation button 13a of the function switch 131 is turned on in the above-mentioned state, that is, in a state where the current temperature is displayed on the display section 12a of the display 12,
If the determination in step S5n in the flowchart of FIG. 9 is YES
And the process proceeds to step S5q via step S5p,
Here, the switch check flag is set, and the switch input is stored once in step S5r.
When the switch check flag is set in step S5q, the determination in step S5g is YES.
And the process proceeds to step S5h, where it is determined whether the same switch has been pressed for a while, and the process proceeds to step S5i to set a switch input presence flag. In the next step S5j, the switch data is stored in the RAM 20.
Then, the flag is stored in the predetermined area of step c, and the switch pressing flag is set in the next step S5k, and the switch checking flag is reset in step S5m.

When the switch input flag is set in step S5i, step S2a is performed.
Is YES, the process proceeds to step S2b, where the switch input flag is reset, and then the process proceeds to step S2b.
2c, but after step S2c, step S2
Proceeding to f, the function switch IN flag is set, and then the function switch processing of step S2g is performed. Step S2 in the function switch process
In step g5, the setting flag is set, and the next step S
In step 2g6, "3" is set in the pointer, and the next step S
At 2g7, the flag during the automatic return timer is set.

By setting the setting flag in step S2g5 and setting "3" to the pointer in step S2g6, the process proceeds to step S4d via steps S4a and S4c, where the off-point set temperature is displayed on the display unit 12a of the display unit 12. Flashes on the display. Thereafter, when the ON operation of the operation button 13a of the function switch 131 is stopped, the determination in step S5d becomes YES, the function switch IN flag is reset in the next step S5e, and the process proceeds to step S5f, where the set value in the RAM 20c is stored in a nonvolatile manner. Overwrite (overwrite) a predetermined area of the memory 23. When the function switch IN flag is reset in step S5e, the process proceeds to step S3c via steps S3a and S3b, where a timer of, for example, 3 seconds is counted down.

The down-counting of this timer is continued until a borrow output is output and the determination in step S3d becomes YES. If the determination in step S3d becomes YES, the automatic reset timer flag and the setting flag are reset in steps S3e and S3f. I do. By resetting the setting flag, the determination in step S4a becomes NO, and the process proceeds to step S4b, where the current temperature is displayed on the display section 12a of the display 12.

If the operation button 13a of the function switch 131 is turned on again before the determination in step S3d becomes YES, the determination in step S5n becomes YES and the above-described operation is repeated, and the process proceeds to step S2g via step S2f. Is performed again, and in step S2g2, the content of the pointer becomes -1.
Will be done. The content of the pointer is -1 so that step S4e becomes YES, and in step S4f, the ON-point set temperature blinks on the display unit 12a of the display unit 12, and the operation button 13a of the function switch 131 is turned on. When stopped, the current temperature is displayed on the display unit 12a of the display unit 12 after a certain period of time, as in the case described above.

As described above, the function switch 13
If, for example, the operation button 13b of the up switch 132 is turned on while the first operation button 13a is being turned on, the determination in step S5n becomes YES and the same operation as described above is performed thereafter. Operation button 1
3b is turned on, the determination in step S2d is Y
It becomes ES and performs the up-switch processing of step S2h. In the up switch processing, steps S2h1 through S2h1
After 2h3, the process proceeds to step S2h5 or S2h9. In the former case, the off-point set temperature of the predetermined area in the RAM 20c is increased by 1 ° C. in step S2h5, and the on-point set temperature is increased by 1 ° C. in step S2h6. In this case, the on-point set temperature is increased by 1 ° C. in step S2h9, the difference between the set temperatures of the off-point and on-point, ie, the on-off temperature difference is calculated in step S2h10, and step S2h9 is performed.
At 2h11, it is determined whether the air conditioner is cooling or heating based on the magnitude relationship between the set temperatures of the off point and the on point. Down switch 13
When the third operation button 13c is turned on, the same operation as in the case of the up switch described above is performed.

According to the embodiment of the present invention described above, C
The PU 20 alternately flashes the OFF point set temperature and the OFF point set temperature on the display 12 displaying the current temperature every time the function switch 131 is turned on. Alternatively, by turning on the down switch 133, the set temperature of the off point or the on point displayed on the display 12 at that time is raised or lowered. Then, when the function switch 131 is turned off, the off-point or on-point set temperature at that time is stored in the nonvolatile memory 23 as a new set temperature, and the display on the display 12 is returned to the original current temperature display after a fixed time.

Then, an on / off temperature difference is obtained from the difference between the set temperatures of the off point and the on point, and the difference between cooling and heating is determined based on the magnitude of the difference. Therefore, there is no need for a means for setting the cooling / heating operation. In addition, confusion due to cooling / heating settings can be prevented.

When the off-point set temperature is changed by raising or lowering the temperature, the on-point set temperature is also raised or lowered at the same time, so that the on-point set temperature is also set. However, when the on / off temperature difference is fixed and used, the work of setting the off-point set temperature does not deteriorate the temperature setting workability.

When the operation button 13a of the function switch 131 is turned on during the blinking display, the display 7
The on-point set temperature blinks on the segment display section 12a, and “SET” and “ON” on the setting display section 12b are displayed.
Is displayed, and in this state, the operation button 13a of the up switch 132 or the down switch 133
The on-point set temperature displayed on the display unit 12a can be changed by turning on the switch 13c. Then, when the desired ON-point set temperature is reached, the operation button 13a of the function switch 131 is released, and the ON-point set temperature displayed on the display unit 12a is stored in the nonvolatile memory 23. After flashing the temperature for a certain period of seconds, the display returns to the original display of the detected temperature. Therefore, when the operation button 13a of the function switch 131 is turned on, the up switch 13 is turned on.
By turning on the operation buttons 13b and 13c of the 2 or the down switch 133, the off-point set temperature and the on-point set temperature stored in the nonvolatile memory 23 can be changed.

When the off-point set temperature is changed by pressing and holding the operation button 13a of the function switch 131 to perform an up or down operation, the on-point set temperature is also increased or decreased in accordance with the increase or decrease of the off-point set temperature. When the temperature is lowered and the ON / OFF temperature difference is fixed, the ON point set temperature can be automatically set up and down with the change of the OFF point set temperature without setting the ON point set temperature.

In the embodiment described above, the RAM 2
The off-point set temperature area 20c1 and the on-point set temperature area 20c2 in 0c function as storage means for rewritably storing the off-point set temperature and the off-point set temperature. Further, a fan cushion switch 131, an up switch 132, a down switch 133, and a step S2
g and the CPU 20 performing the up-switching process in step S2h and the down-switching process in step S2i are provided in the areas 20c1 and 20c.
2 serves as set temperature changing means 20d for changing the set off point temperature and the set off point temperature stored in No. 2.

Further, the CPU 20 executing the display switching process in step S4 serves as display control means 20e for displaying the set temperature to be changed on the display 12 temporarily during the work of changing the set temperature by the set temperature changing means 20d. ing. Furthermore, the CPU 2 executing step S2h11
0 is a cooling / heating setting means 20f that sets the distinction between cooling and heating according to the magnitude of the off-point set temperature and the on-point set temperature.
I'm working. Further, the CPU 20 executing step S2h6 serves as a unit 20d1 for simultaneously changing the other set temperature in the same direction by the same amount when one of the preset off-point set temperature or the on-point set temperature is changed by the set temperature changing unit 20d. ing.

In the above embodiment, the RAM 20c
The function switch 131, the up switch 132, and the down switch 133 are used to change the off-point set temperature and the off-point set temperature stored in the storage unit composed of Although the operation buttons 13a, 13b and 13c are provided on the case panel, any other means can be used as the operation section of the set temperature changing means.

[0045]

As described above, according to the present invention, cooling and heating are automatically set according to the magnitude of the stored OFF point setting temperature and ON point setting temperature. Therefore, it is not necessary to set another for heating and heating, and confusion caused by manual setting can be prevented.

Further, the off-point set temperature and the off-point set temperature stored in a rewritable manner are changed, and the setting for temporarily changing the present temperature, which is always displayed, during the work of changing the set temperature. Since the temperature is displayed, it is possible to reliably change the temperature while checking the set temperature.

Further, when one of the preset OFF-point setting temperature and the ON-point setting temperature is changed, the other setting temperature is automatically set, so that the task of setting the temperature can be reduced. The effect is obtained.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a basic configuration of a temperature control device according to the present invention.

FIG. 2 is a schematic external view showing an embodiment of a temperature control device according to the present invention.

FIG. 3 is a diagram showing an electric circuit in a case in FIG. 2;

FIG. 4 is a main flowchart showing work performed by a CPU in FIG. 3;

FIG. 5 is a diagram showing an area in a RAM in FIG. 3;

FIG. 6 is a flowchart showing details of one step in FIG. 4;

FIG. 7 is a flowchart showing details of another step in FIG. 4;

FIG. 8 is a flowchart showing details of still another step in FIG. 4;

FIG. 9 is a flowchart showing details of another step in FIG. 4;

FIG. 10 is a flowchart showing details of one step in FIG. 6;

FIG. 11 is a flowchart showing details of another step in FIG. 6;

[Explanation of symbols]

12 display 20c1, 20c2 storage means (RAM) 20d set temperature change means (function switch, up switch, down switch, CP
U) 20e Display control means (CPU) 20f Cooling / heating setting means (CPU) 20d1 Means (CPU)

Claims (2)

(57) [Claims] 1. An indicator for constantly displaying a current temperature, a storage means for rewritably storing an OFF point set temperature and an ON point set temperature, and an OFF point set temperature and an ON point set stored in the storage means. Set temperature changing means for changing the temperature; display control means for displaying the set temperature to be changed on the display temporarily while the set temperature is changed by the set temperature changing means; and the off-point set temperature. A cooling / heating setting means for setting a cooling / heating setting according to a magnitude of a temperature and an ON-point set temperature. 2. The apparatus according to claim 1, wherein said set temperature changing means includes means for simultaneously changing the other set temperature in the same direction by the same amount when one of the preset off-point set temperature or on-point set temperature is changed by said means. The temperature control device according to claim 1, wherein: