KR101259621B1 - Water purifier and Control process of the same - Google Patents

Abstract

The water purifier according to the present invention includes a water purifying unit for purifying water; A cooling tank in which a coolant is contained; A cold water coil disposed inside the cooling tank and heat-exchanged with the coolant while passing through the purified water in the purified water unit; A compressor in which the refrigerant is compressed; A condenser for condensing the refrigerant compressed in the compressor; An expansion mechanism for expanding the refrigerant condensed in the condenser; An evaporator for evaporating the refrigerant expanded in the expansion mechanism and being disposed in the cooling tank to cool the coolant; An agitator installed in the cooling tank to stir the coolant; Including a control unit for driving the compressor first alone of the compressor and the stirrer and then driving the stirrer alone of the compressor and the stirrer, since a large amount of ice can be easily generated on the surface of the evaporator, the coolant can be stirred, There is a large number, there is an advantage that can continuously supply the cold water of the appropriate temperature range to the user.

Description

Water purifier and its operation method {Water purifier and Control process of the same}

The present invention relates to a water purifier and a method of operating the same, and more particularly, to a water purifier provided with a stirrer in a cooling tank and a method of operating the same.

In general, a water purifier is a device for filtering impurities or water supplied from a bucket by physical and chemical methods to remove impurities.

The water purifier can be supplied after cooling the purified water as well as generating the cold water at room temperature.

Recently, an ice heat storage type water purifier is used, in which a fluid in an ice storage type cooling tank is cooled by a cooling device, and a cooling tube through which the purified water passes is cooled by a fluid cooled by the cooling device.

The ice storage type water purifier is provided with a stirring device for agitating the fluid in the ice storage cooling tank to reduce the rapid freezing of the fluid contained in the ice storage cooling tank.

KR 10-2011-0001353 (2011.01.06)

The water purifier according to the related art may not produce enough ice inside the cooling tank when the stirring device is driven when the compressor is driven, and there is a problem in that the quantity of cold water that can be continuously discharged is reduced.

The present invention has been made to solve the above problems of the prior art, and an object of the present invention is to provide a water purifier and a method of operating the same that can be continuously supplied with a large amount of cold water.

Water purifier according to the present invention for solving the above problems; A cooling tank in which a coolant is contained; A cold water coil disposed inside the cooling tank and heat-exchanged with a coolant while the water purified by the clean water unit passes; A compressor in which the refrigerant is compressed; A condenser for condensing the refrigerant compressed by the compressor; An expansion mechanism for expanding the refrigerant condensed in the condenser; An evaporator configured to evaporate the refrigerant expanded by the expansion mechanism and be disposed in the cooling tank to cool the coolant; An agitator installed in the cooling tank to agitate the coolant; And a controller for driving the compressor alone among the compressor and the stirrer first, and then driving the stirrer alone among the compressor and the stirrer.

The water purifier may further include a thermistor for sensing the temperature of the coolant, and the controller may further drive the compressor for a preset time after the compressor is operated at a temperature higher than a preset temperature when the compressor operates alone. Can be stopped.

The water purifier may further include an adjusting unit for adjusting the set time, and the control unit may reset the set time when the adjusting unit is adjusted.

The water purifier may have a cold water large capacity mode capable of taking a large amount of cold water by setting the set time longer, and a power saving mode capable of saving power by setting the set time shorter than the cold water large capacity mode.

According to an aspect of the present invention, there is provided a method of operating a water purifier, including: a compressor alone driving step of driving a compressor independently of a compressor and an agitator when a coolant temperature in a cooling tank is equal to or higher than a compressor on temperature; And a stirrer sole driving step of stopping the compressor and driving the stirrer alone of the compressor and the stirrer after the compressor driving step alone.

The compressor driving step may include a compressor driving step of driving the compressor when a coolant temperature in the cooling tank is equal to or higher than a compressor on temperature; If the coolant temperature in the cooling tank during the compressor driving process is a set temperature may include a compressor additional driving process for further driving the compressor for a set time.

 The set temperature may be set lower than the compressor on temperature.

When the user variably manipulates the set time, the set time may be changed and reset.

According to the present invention, a large amount of ice is easily generated on the surface of the evaporator, and then the coolant is agitated to increase the amount of ice accumulation on the surface of the evaporator, thereby providing the user with continuous supply of cold water at an appropriate temperature range.

In addition, the user can select the cold water large capacity mode and the power saving mode has the advantage that the convenience of using the water purifier is improved.

1 is a view showing the configuration of an embodiment of a water purifier according to the present invention;
Figure 2 is a schematic perspective view of the cooling bath module shown in Figure 1,
3 is a view showing a change in power of one embodiment of the water purifier according to the present invention;
4 is a view showing a coolant temperature change of one embodiment of the water purifier according to the present invention;
FIG. 5 is a diagram illustrating power change when the stirrer is driven alone and the compressor and the stirrer are driven together, and then the compressor is stopped to drive only the stirrer alone.
6 is a diagram illustrating a change in coolant temperature when the stirrer is driven alone and the compressor and the stirrer are simultaneously driven and then the compressor is stopped to drive the stirrer alone.
7 is a flowchart illustrating an embodiment of a method of operating a water purifier according to the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a view showing a configuration of an embodiment of a water purifier according to the present invention, Figure 2 is a schematic perspective view of the cooling bath module shown in FIG.

As shown in FIG. 1, the water purifier includes a water purifying unit 2 for purifying water and a cooling tank module 4 for cooling the water purified by the water purifying unit 2. The water purifier may further include a hot water tank module 6 for heating the water purified by the water purification unit 2. The water purifier may be composed of a direct type cold / hot water purifier, in which water purified from the water purifying unit 2 may be supplied to the cooling tank module 4 and the hot water tank module 6 without passing through a separate water tank. It explains as being.

The water purification unit 2 is connected to a raw water supply source 8 such as a faucet and a raw water supply flow path 10 to purify the water supplied from the raw water supply source 8.

The water purification unit 2 may include at least one filter 12, 14, 16 through which water passes sequentially, and at least one filter 12, 14, 16 of the raw water feed passage 10. Water supply valve 18 for adjusting the water flowing toward the () may be installed.

The purified water unit 2 is connected to the purified water flow path 20 through which the purified water flowing out of the purified water unit 2 passes.

The purified water flow path 20 may be arranged to withdraw the water flowing out of the purified water unit 2 to the outside, and the hot water tank 4 and the cooling tank do not directly discharge the water flowing out of the purified water unit 2 to the outside. It is possible to arrange to guide to at least one of (6).

The purified water flow path 20 may be provided with a purified water discharge valve 24 for discharging or blocking water discharged from the purified water unit 2 to the outside when the purified water unit 2 is discharged to the outside. have.

The purified water outlet valve 24 is a solenoid valve that discharges water when a purified water extraction command is input through a purified water extraction input unit (not shown), such as a purified water extraction button, and prevents water discharge when the purified water extraction stop command is input through the purified water extraction input unit. It is possible to consist of. The purified water discharge valve 24 may be formed of a purified water discharge coke valve that is provided with a purified water discharge lever (not shown) to discharge water during operation of the purified water discharge lever.

The cooling tank module 4 includes a cooling tank 30 in which the coolant is contained, a cold water coil 32 disposed inside the cooling tank 30 and heat-exchanged with the cooling material while passing the purified water from the water purification unit 2, It may include a cooling device 34 for cooling the coolant, and a stirrer 36 installed in the cooling tank 30 to stir the coolant of the cooling tank 30.

Here, the coolant is a cold storage material that is cooled in the cooling device 34 to take heat from the cold water coil 32, and the water can be stirred by the stirrer 36 while allowing phase change into a liquid and a solid according to temperature change. Is preferably used, and water purified in the water purification unit 2 can be used as the coolant.

The cooling tank 30 is connected to the purified water flow path 20 and the cooling water purification flow path 38, and may receive purified water through the cooling water purification flow path 38. , The drain passage 40 through which water is drained to the outside may be connected to drain the coolant (ie, water) to the outside. The drain passage 40 may be provided with a drain valve 42 for adjusting the drainage of the coolant through the drain passage 40.

The cold water coil 32 is a heat exchanger tube for heat-exchanging water and coolant purified by the purified water unit 2, and may be made of stainless steel.

 The cold water coil 32 may be connected to the purified water flow path 20 and the cold water purified water flow path 44. The cooling coil 32 may be connected to a cold water discharge passage 46 arranged to withdraw water from the cooling coil 32 to the outside.

The cold water discharge channel 46 may be provided with a cold water discharge valve 48 for discharging or blocking the water leaked from the cooling coil 40 to the outside.

The cold water outlet valve 48 controls the outlet of the water cooled by the cooling coil 32. When the cold water outlet command is input through a cold water outlet input unit (not shown) such as a cold water outlet button, the water is discharged and the cold water outlet is input. When the cold water discharge stop command is input through the unit, it is possible to constitute a solenoid valve that prevents the discharge of water. The cold water discharge valve 48 may be formed of a cold water discharge coke valve that is provided with a cold water discharge lever (not shown) to discharge water when the cold water discharge lever is operated.

The water purifier may include a cold water valve 50 installed in the purified water flow path 20 to regulate a water supply to the cold water purified water flow path 44. The water purifier may include a coolant valve 52 installed in the purified water flow path 20 to regulate water supply to the coolant purified water flow path 38.

The cooling device 34 includes a compressor 60 in which the refrigerant is compressed, a condenser 62 in which the refrigerant compressed in the compressor 60 is condensed, an expansion mechanism 64 in which the refrigerant condensed in the condenser 62 is expanded, and , A refrigeration cycle circuit having an evaporator 66 in which the refrigerant expanded in the expansion mechanism 64 is evaporated, and the refrigerant may include the compressor 60, the condenser 62, the expansion mechanism 64, and the evaporator 66. Circulate

The compressor 60, the condenser 62, and the expansion mechanism 64 are disposed outside the cooling tank 30, and the evaporator 66 can directly cool the coolant in contact with the coolant in the cooling tank 30. It is arranged inside the cooling bath 30 so that.

 The evaporator 66 may have a spiral portion, a portion of which is spirally arranged inside the cooling bath 30.

The evaporator 66 is disposed to be immersed in the coolant, and serves to supply cool air to the coolant while the low temperature low pressure refrigerant passes when the compressor 60 is driven, and ice is formed on the surface of the cold water coil 32. The cold air required for production can be cooled.

The stirrer 36 may include a blade 68 capable of forming a rotational water flow in the coolant, and a motor 70 connected to the blade 68 and a rotation shaft to rotate the blade 68.

The blade 68 may be located inside the spiral of the evaporator 66, and the motor 70 may be installed on the upper portion of the cooling tank 30.

When the driving signal is input to the motor 70, the agitator 36 is rotated by the motor 70 to equalize the temperature for each height of the coolant, and increase the convective heat transfer coefficient of the cold water coil 32. Cold water production can be promoted.

The cooling tank module 4 may further include a thermistor 72 installed in the cooling tank 30 to sense the temperature of the coolant.

The thermistor 72 may be installed at a position for sensing the coolant temperature around the cold water coil 32.

As illustrated in FIG. 1, the hot water tank module 6 may be connected to the purified water flow path 20 and the hot water purified water flow path 82 to heat the water flowing through the hot water purified water flow path 82.

The hot water tank module 6 includes a hot water tank 84 containing water purified by the water purification unit 2 and a hot water heater 86 installed in the hot water tank 84 to heat the water of the hot water tank 58. It may include.

The hot water tank 84 may be provided with a thermistor 85 for sensing the water temperature in the hot water tank 84.

The hot water tank module 6 may be connected to the hot water discharge passage 88 which is arranged to withdraw water from the hot water tank 84 to the outside.

The hot water discharge passage 88 may be provided with a hot water discharge valve 90 to discharge or block the water leaked from the hot water tank module (6) to the outside.

The hot water outlet valve 90 is a solenoid valve that prevents water from being discharged when the hot water discharge command is input through a hot water discharge input unit (not shown) such as a hot water discharge button, and the hot water discharge stop command is input through the hot water discharge input unit. It is possible to consist of. The hot water discharge valve 90 may be formed of a hot water discharge coke valve installed with a hot water discharge lever (not shown) to discharge water when the hot water discharge lever is operated.

The water purifier may further include a controller 100 for controlling the cooling tank module 4. The controller 100 may control the compressor 60 and the agitator 36 according to the temperature of the thermistor 72 installed in the cooling tank 30.

On the other hand, the control unit 100 may control the hot water tank module 6 together with the cooling bath module 4. The controller 100 may control the heater 86 for hot water according to the temperature of the thermistor 85 installed in the hot water tank 84. If the temperature sensed by the thermistor 85 installed in the hot water tank 84 is equal to or lower than the heater on temperature, the controller 100 may turn on the hot water heater 86 to heat the water in the hot water tank 84. When the temperature sensed by the thermistor 85 installed in the tank 84 is equal to or higher than the heater off temperature, the hot water heater 86 may be turned off.

3 is a view showing a change in power of one embodiment of the water purifier according to the present invention, Figure 4 is a view showing a change in coolant temperature of one embodiment of the water purifier according to the present invention, Figure 5 is a compressor and stirrer while driving the stirrer alone Is a diagram showing the power change when only the stirrer is driven by driving the compressor together, and then the stirrer is driven alone. FIG. 6 drives the stirrer alone and simultaneously drives the compressor and the stirrer. It is a figure which shows the change of coolant temperature at the time of making.

3 and 4 is a period in which the compressor 60 is independently driven among the compressor 60 and the stirrer 36, and the B time in FIGS. 3 and 4 is the compressor 60 after the single drive of the compressor 60 is performed. ) And the stirrer 36 is a period for driving the stirrer 36 alone.

As shown in FIGS. 3 and 4, the controller 100 may first drive the compressor 60 alone among the compressor 60 and the agitator 36, and then drive the agitator 36 alone. That is, the controller 100 may drive the compressor 60 without driving the stirrer 36, and then stop the compressor 60 and drive the stirrer 36.

If the temperature sensed by the thermistor 32 is equal to or higher than the compressor on temperature, the controller 100 may drive the compressor 60 alone.

Here, the compressor on temperature is a temperature set for initiating cooling of the coolant, for example, may be set to 8 ° C.

When the compressor 60 is driven alone, the stirrer 36 is not driven, and the coolant is cooled by natural convection from the periphery of the evaporator 66, and ice gradually accumulates on the surface of the evaporator 66.

On the other hand, when the stirrer 36 is driven together with the drive of the compressor 60 when the compressor 60 is driven, the cold air of the evaporator 66 can be quickly transferred to the cold water coil 32 by the forced convection of the coolant, but the evaporator (66) Ice may not be generated on the surface or a small amount of ice may be generated on the surface of the evaporator 66. That is, in order to generate a large amount of ice on the surface of the evaporator 66, it is preferable not to drive the stirrer 36 when the compressor 60 is driven.

When the temperature sensed by the thermistor 72 is the set temperature Ts when the compressor 60 is driven alone, the controller 100 further drives the compressor 60 for a set time ts and then stops the compressor 60. Can be.

Here, the set temperature Ts is a temperature set for determining further driving of the compressor 60, and may be set lower than the compressor on temperature, and may be set to 6.5 ° C. when the compressor on temperature is set to 8 ° C. FIG.

When the temperature sensed by the thermistor 72 is the set temperature Ts, the control unit 100 can immediately stop the compressor 60 and drive the stirrer 36. In this case, the surface of the evaporator 66 Will no longer generate additional ice. However, if the compressor 60 is further driven during the set time ts as described above, a large amount of ice is continuously generated on the surface of the evaporator 66 for the set time ts.

When the compressor 60 is driven alone, the coolant is cooled by natural convection from the periphery of the evaporator 66 while the temperature sensed by the thermistor 72 falls nonlinearly. That is, in the initial stage of driving the compressor 60, the temperature detected by the thermistor 72 decreases at a high speed, and as time passes, the temperature detected by the thermistor 72 decreases at a relatively slow speed.

When the water purifier is set to a long set time ts, the amount of ice generated on the surface of the evaporator 66 increases, so that the cold water coil 32 can generate a large amount of cold water at an appropriate temperature, while the power consumption increases. When the set time ts is set short, power consumption is reduced, but the amount of ice generated on the surface of the evaporator 66 is relatively small, so that the cold water coil 32 can generate a small amount of cold water at an appropriate temperature range. Will be.

The water purifier can change the amount of cold water available for the user to take in by increasing or shortening the set time ts.

That is, when the set time ts is set long, a large amount of ice is generated on the surface of the evaporator 66 so that the amount of cold water at an appropriate temperature that the user can take in is increased, and the set time ts is set short. In this case, a relatively small amount of ice is generated on the surface of the evaporator 66 so that the amount of cold water at a suitable temperature that the user can take in is reduced.

The water purifier may further include an adjusting unit 110 for adjusting the setting time ts, and the control unit 100 may reset the setting time when the adjusting unit 110 is adjusted.

 The water purifier may have a cold water mass mode capable of taking a large amount of cold water by setting the set time ts long, and a power saving mode capable of saving power by setting the set time ts shorter than the cold water mass mode.

The adjusting unit 110 may be configured as a time adjusting unit for the user to adjust the set time ts by time, and may be configured as a cold water quantity adjusting unit for adjusting the size of the cold water by the user.

The adjusting unit 110 may be formed of at least one button that allows the user to directly input the set time ts, and may be made of a rotary switch that can select the set time ts among a plurality of times by rotation. The touch screen can be configured to directly input the setting time ts by touching the screen.

The adjusting unit 110 may be composed of at least one button that allows the user to directly input large, medium, and small quantities of the cold water, and may be formed of a rotary switch that can select the quantity of cold water by rotation. It is possible to make a touch screen which directly inputs the quantity of cold water by touching.

On the other hand, after the compressor 60 is further driven by the set time ts, the controller 100 stops the compressor 60 and drives the stirrer 36 with the compressor 60 stopped.

In the sole driving of the stirrer 36 of the compressor 60 and the stirrer 36, the coolant is forced convection by the stirrer 36 and the temperature sensed by the thermistor 72 falls linearly as shown in FIG. do.

Meanwhile, period C of FIGS. 5 and 6 is a period for driving the stirrer 36 alone, period D of FIGS. 5 and 6 is a period for driving the compressor 60 and the stirrer 36 together. E period in FIG. 6 is a period for driving the stirrer 36 alone. When the coolant in the cooling tank 30 is continuously generated by forced convection by the continuous driving of the stirrer 36, and the compressor 60 is driven while the stirrer 36 is continuously driven, the cooling tank 30 is stopped. The coolant temperature in the column) decreases linearly, as shown in FIG. 6 by the continued drive of the stirrer 36.

5 and 6, the large amount of ice is prevented from being produced on the surface of the evaporator 66. As shown in FIGS. On the other hand, if the user starts the intake of cold water after the sole driving of the stirrer 36 is completed, the temperature of the coolant rises linearly, and the water purifier can withdraw the cold water at an appropriate temperature only for a short time.

That is, as shown in FIGS. 4 and 5, the stirrer 36 is not driven when the compressor 60 is driven, but when the compressor 60 is stopped, the stirrer 36 is driven so that the coolant is forced convection. Is preferred.

7 is a flowchart illustrating an embodiment of a method of operating a water purifier according to the present invention.

The operation method of the water purifier according to the present invention is a compressor sole driving step (S1), S2, S3, S4, S5, and after compressor single driving step (S1), S2, S3, S4, S5. It may include a stirrer sole driving step (S6) (S7) (S8) carried out in.

Compressor alone driving step (S1) (S2) (S3) (S4) (S5) is to separate the compressor 60 of the compressor 60 and the stirrer 36 when the coolant temperature in the cooling tank 30 is equal to or higher than the compressor on temperature. Driven by

 Compressor driving step (S1) (S2) (S3) (S4) (S5) is a compressor driving process (S1) (S2) for driving the compressor (60) when the coolant temperature in the cooling tank (30) is equal to or higher than the compressor on temperature. It includes.

When the compressor 60 is driven, refrigerant is discharged from the compressor 60, and the discharged refrigerant is sequentially passed through the condenser 62, the expansion mechanism 64, and the evaporator 66, and then recovered to the compressor 60. . The coolant in the cooling tank 30 is gradually cooled during the circulation of the refrigerant as described above. Of the coolant, the coolant around the evaporator 66 freezes on the surface of the evaporator 66 and the ice thickness around the evaporator 66 gradually becomes thicker. When the compressor 60 is driven as described above, the stirrer 36 is not driven, and the evaporator 66 generates more ice than when the stirrer 36 is driven together with the compressor 60.

 Compressor alone driving step (S1) (S2) (S3) (S4) (S5) is the compressor 60 set time if the coolant temperature in the cooling tank 30 in the middle of the compressor driving process (S1) (S2) set temperature. Compressor further drive process (S3) (S4) (S5) to further drive during. Here, the set temperature is set lower than the compressor on temperature, and if the user variably manipulates the set time, the set time may be varied and reset.

In the compressor driving process (S1) (S2), the coolant temperature in the cooling tank 30 is lowered by natural convection and conduction of the coolant, and when the coolant temperature reaches the set temperature, the compressor 60 reaches the set temperature. It is further driven for a set time from the point of arrival.

 By further driving of the compressor 60, ice is further generated on the surface of the evaporator 66, and when the set time has elapsed since the coolant temperature reaches the set temperature, the compressor alone driving step S1 (S2). (S3) (S4) (S5) ends.

The stirrer alone driving step (S6), S7, and S8 stops the compressor 60 after the compressor alone driving step (S1), S2, S3, S4, and S5, and the compressor 60 and the stirrer ( The stirrer 36 in 36) is driven alone.

Here, since the stirrer sole driving step (S6) (S7) (S8) is a state in which a large amount of ice is sufficiently generated on the surface of the evaporator 66 by the sole driving of the compressor 60, by stirring the coolant to cool the cooling tank (30) This step is to level the internal temperature as a whole.

When the compressor 60 is stopped, the refrigerant no longer circulates through the compressor 60, the condenser 62, the expansion mechanism 64, and the evaporator 66, and when the stirrer 36 is driven, The coolant is stirred and forced to convection.

The cold air of ice generated on the surface of the evaporator 66 is evenly transferred to the inside of the cooling tank 30 by forced convection of the coolant, and the cold water of the cold water coil 32 is rapidly cooled by the forced coolant.

The stirrer alone driving steps S6, S7 and S8 are carried out for the stirring set time (for example, 1 minute), and the stirrer 36 is stopped when the stirring set time elapses after the start of driving.

The water purifier then waits for the cold water outlet of the user, and when the user inputs the cold water outlet through the cold water outlet input unit, the cold water in the cooling coil 32 is discharged to the outside through the cold water outlet valve 48, and at this time, the agitator 36 Can be driven while cold water is withdrawn.

In the cold water discharge as described above, even if the user inputs a large amount of cold water discharge, a large amount of ice is generated on the surface of the evaporator 66, and the user can take a large amount of cold water at an appropriate temperature.

2: water purification unit 4: cold water tank module
30: cooling tank 32: cold water coil
34: chiller 36: stirrer
48: cold water outlet valve 60: compressor
62: condenser 64: expansion mechanism
66: evaporator 68: blade
70: motor 72: thermistor
100: control unit 110: control unit

Claims (8)

A water purification unit for purifying water;
A cooling tank in which a coolant is contained;
A cold water coil disposed inside the cooling tank and heat-exchanged with a coolant while the water purified by the clean water unit passes;
A compressor in which the refrigerant is compressed;
A condenser for condensing the refrigerant compressed by the compressor;
An expansion mechanism for expanding the refrigerant condensed in the condenser;
An evaporator configured to evaporate the refrigerant expanded by the expansion mechanism and be disposed in the cooling tank to cool the coolant;
An agitator installed in the cooling tank to agitate the coolant;
A controller for driving the compressor alone among the compressor and the stirrer first, and then driving the stirrer alone among the compressor and the stirrer;
It includes a thermistor for sensing the temperature of the coolant,
And the controller is configured to stop the compressor after further driving the compressor for a predetermined time when the temperature sensed by the thermistor during the independent operation of the compressor is a set temperature. delete The method of claim 1,
The water purifier further includes a control unit for adjusting the set time,
The control unit is a water purifier for resetting the set time when the adjustment of the control unit. The method of claim 3, wherein
The water purifier has a cold water large capacity mode capable of taking a large amount of cold water by setting the set time longer, and a power saving mode capable of saving power by setting the set time shorter than the cold water large capacity mode. A compressor alone driving step of driving the compressor independently of the compressor and the stirrer when the coolant temperature in the cooling tank is equal to or higher than the compressor on temperature;
And a stirrer sole driving step of driving the stirrer alone of the compressor and the stirrer as well as stopping the compressor after the compressor driving step alone.
The compressor driving step may include a compressor driving step of driving the compressor when a coolant temperature in the cooling tank is equal to or higher than a compressor on temperature;
And a compressor additional driving step of further driving the compressor for a preset time when the coolant temperature in the cooling tank is a preset temperature during the compressor driving process. delete The method of claim 5, wherein
And the set temperature is lower than the compressor on temperature. The method of claim 5, wherein
And when the user variably manipulates the set time, the set time is changed and reset.

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