KR20120110731A - Ice making method and ice making water purifier and ice making hot and cold water dispenser using thereof - Google Patents

Abstract

PURPOSE: An ice making method, an ice maker using the same, and a hot and cold water dispenser with the ice maker are provided to make a large amount of uniform ice regardless of a temperature change. CONSTITUTION: An ice maker using an ice making method comprises a water purification tank(10), a cold water tank(20), a purified water supply valve(12), and an ice making unit(30). The purified water supply valve supplies purified water from the water purification tank to the cold water tank. The ice making unit makes ice using a part of the cold water supplied from the cold water tank and cools the other part of the cold water. [Reference numerals] (AA) Precipitation filter; (BB) Pre-carbon filter; (CC) Membrane filter; (DD) Post-carbon filter

Description

Ice making method and ice making machine using ice making method and the ice-cold water purifier {Ice making method and ice making water purifier and ice making hot and cold water dispenser using YOO}

The present invention relates to an ice making method and an ice water purifier and an ice cold water dispenser using the ice making method, and more particularly, an ice making method capable of producing uniform ice and an ice water purifier and an ice making method using the ice making method. It relates to a cold and hot water machine.

In general, ice water purifiers and ice cold and hot water dispensers can produce ice as well as cold water.

The ice purifier includes a filter unit 40 for purifying raw water, a purified water tank 10 for storing purified water, a cold water tank for storing cold water, and an ice making unit 30 for producing ice. Moreover, the hot water tank which stores hot water as needed is provided. In addition, the ice cold and hot water dispenser is a device that omitted the configuration to purify the raw water in the ice water purifier.

The ice purifier and ice cold water dispenser solved the hassle of using ice by separating water from the ice tray after freezing the water in the ice tray of the refrigerator.

However, if the user intakes cold water while the ice is being produced inside the ice purifier or ice cold water dispenser, the full water level of the cold water tank is released and water at room temperature flows into the cold water tank, and the ice making unit 30 has a temperature due to the introduced water. Since the ice is produced by the elevated cold water, there is a problem such that very small unfinished ice is produced or only a small amount of ice is produced than the ice used in food or drink.

In addition, there is a problem that the size of the ice and the amount of ice to be produced varies depending on the place where the ice water purifier or ice cold water heater is installed or the temperature change.

The present invention has been conceived to solve the above-described problems, preventing the production of unfinished ice and a small amount of ice, and an ice making method that can produce a large amount of uniform ice and an ice water purifier using the ice making method and It is an object to provide an ice cold and hot water machine.

In order to achieve the above object, an ice water purifier or ice cold water machine according to a preferred embodiment of the present invention, a purified water tank, a cold water tank having a cold water intake port, a purified water feed valve for supplying purified water in the purified water tank to the cold water tank, and the And an ice making unit for ice-making a portion of the cold water supplied from the cold water tank and cooling the remainder, wherein different ice making requirements are predetermined according to the ambient temperature, and cold water of less than a certain capacity from the cold water tank during the ice making operation of the ice making unit. When water is taken out, the purified water feed valve is opened after the ice making operation is performed for the ice making demand time.If the cold water withdraws a certain capacity from the cold water tank during the ice making operation of the ice making unit, the purified water feed valve is discharged from the moment when the water intake exceeds the specific capacity. Open.

Preferably, when less than a certain capacity of cold water is withdrawn from the cold water tank during the ice making operation of the ice making unit, a defrosting operation is performed in the ice making unit with the opening of the purified water feed valve.

Preferably, when cold water of a certain capacity or more is withdrawn from the cold water tank during the ice making operation of the ice making unit, a deicing operation is performed when cold water of the specific capacity or more is withdrawn from the cold water tank after a time when ice larger than unfinished ice is formed by the ice making unit. If ice water larger than the specific capacity is withdrawn from the cold water tank before the time when ice larger than the unfinished ice is formed by the ice making unit, the defrosting operation is not performed.

Here, it is preferable that the cold water of a specific volume or more is cold water of 30%-70% of the total capacity of a cold water tank.

Preferably, when the temperature of the cold water in the cold water tank is higher than the upper limit of the deicing temperature, the deicing operation is performed by calculating the elapse of the deicing request time based on the time when the temperature of the cold water drops to the upper limit of the deicing temperature.

Ice making method according to a preferred embodiment of the present invention, the step of setting the ice making time according to the ambient temperature; And determining whether the cold water is taken over a specific capacity from the cold water tank during the ice making operation of the ice making unit.

Preferably, if cold water of less than a specific capacity is taken out during the ice making operation, the purified water feed valve is opened after the ice making operation is performed for the required ice making time, and the defrosting operation is performed together with the opening of the purified water feed valve.

Preferably, the ice making method further comprises the step of opening the purified water feed valve from the moment when the water intake exceeds a certain capacity, if the cold water withdraws the specific capacity during the ice making operation.

Preferably, the ice making method further comprises determining whether ice larger than unfinished ice is formed by the ice making unit.

In addition, preferably, when ice larger than the unfinished ice is formed, the ice-breaking operation is performed, and when ice larger than the unfinished ice is not formed, the ice-breaking operation is not performed.

According to the present invention, it is possible to prevent the production of unfinished ice and trace ice, and to produce a large amount of uniform ice.

In addition, it is possible to provide a constant ice making method and an ice water purifier and an ice cold water heater using the above-mentioned ice making method without changing the size of the generated ice and the amount of ice according to the place where the ice water purifier or the ice cold water heater is installed or the temperature change. .

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate preferred embodiments of the invention and, together with the description of the invention given above, serve to further the understanding of the technical idea of the invention, And should not be construed as interpretation.
1 is a main configuration of the ice water purifier according to the present invention.
2 is a flow chart of the ice making method according to the invention.

Hereinafter, an ice making method and an ice water purifier and an ice cold / hot water ice maker using the ice making method and the ice making method according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

The terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms and the inventor may appropriately define the concept of the term in order to best describe its invention It should be construed as meaning and concept consistent with the technical idea of the present invention. Therefore, the embodiments described in the specification and the drawings shown in the drawings are only the most preferred embodiment of the present invention and do not represent all of the technical idea of the present invention, various modifications that can be replaced at the time of the present application It should be understood that there may be equivalents and variations.

In the drawings, the size of each component or a specific portion constituting the components is exaggerated, omitted, or schematically illustrated for convenience and clarity of description. Therefore, the size of each component does not entirely reflect the actual size. In the following description, it is to be understood that the detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

1 is a main configuration of the ice water purifier 50 according to the present invention, Figure 2 is a flow chart of the ice making method according to the present invention.

The ice water purifier 50 includes a filter unit 40, a purified water tank 10 for storing purified water purified by the filter unit 40, a cold water tank 20 for storing cold water, and the purified water tank 10. Water supply valve 12 for supplying purified water into cold water tank 20, circulation pump 15 for supplying cold water in cold water tank 20 to ice making unit 30, and cold water tank 20 And an ice making unit 30 for ice-making a portion of the cold water and cooling the rest.

The filter unit 40 purifies raw water such as tap water and the like, and may be formed of conventional filters such as a precipitation filter and a carbon filter.

The purified water generated by the filter 40 is stored in the purified water tank 10. However, some of the purified water generated by the filter unit 40 may be stored in the purified water tank 10, and the remaining purified water may be stored in the hot water tank (not shown). The normal temperature purified water is heated by hot water by a common heating member installed in the hot water tank, and is supplied to the user through a hot water intake valve (not shown).

Preferably, the water level tank 10 is provided with a water level detecting member 18 for detecting the water level. When the water level detecting member 18 detects that the water level has reached a predetermined level, for example, the purified water supply is blocked to prevent the purified water from being supplied to the purified water tank 10.

The water at room temperature is supplied to the user through the purified water intake valve 16.

The purified water feed valve 12 supplies water from the purified water tank 10 to the cold water tank 20, and a solenoid valve or the like is usually used.

An ice grill 28 installed to be inclined above the cold water tank 20 is disposed, and a circulation pump 15 is disposed inside or outside the cold water tank 20. Preferably, the cold water tank 20 is provided with a cold water level sensor for detecting the water level, and a cold water temperature sensor for detecting the temperature. The cold water stored in the cold water tank 20 is supplied to the user through the cold water intake valve 26.

The ice grill 28 is composed of a plurality of grids, and the distance between adjacent grids is narrower than the size of the ice to be manufactured, so that the ice produced in the ice making unit 30 to be described later falls on the ice grill 28 and the cold water tank ( 20) is moved along the slope to the ice reservoir 2 without falling into it. In addition, the remaining water used for ice making or cold water cooled by the ice making unit 30 passes between the grids of the ice grill 28 and is stored in the cold water tank 20.

The circulation pump 15 moves the purified water stored in the cold water tank 20 to the place where the ice making unit 30 is located through the cold water supply pipe 14.

The ice making unit 30 includes an evaporator 22, a plurality of protrusion shaped evaporation fingers 24 protruding from the evaporator 22, and a nozzle assembly 25. One end of the nozzle assembly 25 is connected to the cold water supply pipe 14, and is wider than the diameter of the evaporation finger 24 to surround the evaporation finger 24 with a predetermined distance from the outer circumferential surface of each evaporation finger 24. It is a plate-shaped structure with a through hole formed. Cold water flows inside the nozzle assembly 25, and a water spray nozzle is formed in a through hole surrounding the evaporation finger 24, and the cold water is injected to the evaporation finger 24.

The low-temperature liquid refrigerant flows into the evaporator 22, and when cold water is injected into the evaporation finger 24, the injected cold water becomes colder cold water or ice. On the other hand, the liquid refrigerant flowing into the evaporation finger 24 gets heat from the cold water injected into the evaporation finger 24 and exits the evaporator 22 in the gas state. Repeating this process produces cold water or ice.

In addition to the above-described ice making unit 30, an immersion type ice making unit in which the evaporation finger 24 is immersed in the drip tray containing water to produce ice or cold water may be used. Published in 10-0729962.

The ice cold and hot water purifier 52 is a device in which the purified water tank 10 and the filter unit 40 are omitted from the above-described ice water purifier 50, and a separate water reservoir (not shown) containing water in a drinkable state is a purified water tank. 10 and the filter unit 40 is installed to replace, the configuration of such a cold and hot water heater is published in Korea Patent No. 10-0853445. The rest of the configuration is the same as the above-described ice water purifier 50.

Therefore, the description of the control method and the like not directly related to the mechanical structure of the purified water tank 10, the filter unit 40 and the water reservoir (not shown) is similarly applied not only to the ice water purifier 50 but also to the ice cold and hot water heater 52. Make it clear that it can be applied.

Hereinafter, the opening time control and the defrosting control of the purified water feed valve 12 according to the intake amount of the cold water and the intake point will be described.

Prior to the description, the ice making operation refers to an operation of making ice with the ice making unit 30 or cooling cold water at least in the cold water tank 20 more coldly, and the de-icing operation refers to a refrigerant to remove the ice from the ice making unit 30. To stop the flow of water and drive the heater installed in the ice making unit 30 to drop the ice suspended on the evaporation finger 24 or to flow the refrigerant flowing in the ice making unit 30 in the reverse direction to cool the gas in the hot state Is transferred to heat to the evaporation finger 24 to drop the ice suspended on the evaporation finger 24.

Ice that is generally convenient for the user to use is about 10 grams of ice, and the time required to perform an ice making operation to manufacture the ice (hereinafter referred to as 'ice making time') is an ice water purifier ( 50) depends on the temperature at which the site is installed (hereafter referred to as 'ambient temperature').

That is, different ice making requirements are determined in advance according to the ambient temperature, and the following Table 1 shows an example of the ice making request time for each ambient temperature.

Ambient temperature (° C) Ice making time required (minutes) 3 ° C or less 8.5 3 ° C above 6 ° C 8.5 6 ° C and below 9 ° C 9.0 9 ° C and below 12 ° C 9.0 12 ° C above 15 ° C 9.0 15 ° C above 18 ° C 9.5 18 ° C above 21 ° C 10.5 21 ° C above 24 ° C 11.0 24 ° C above 26 ° C 12.0 26 ° C above 28 ° C 13.0 28 ° C above 30 ° C 14.0 Above 30 ° C Below 33 ° C 15.0 33 ° C above 35 ° C 16.0 Above 35 ° C Below 37 ° C 17.5 Above 37 ° C Below 39 ° C 18.0 Above 39 ° C Below 41 ° C 19.0 41 ° C above 42 ° C 21.0 Above 42 ° C Below 43 ° C 22.5 43 ° C above 45 ° C 24.0 45 ° C above 46 ° C 26.0 Above 46 ° C Below 47 ° C 28.0 Above 47 ° C 30.0

The present invention controls the opening timing of the purified water feed valve 12 differently depending on whether cold water of less than a certain capacity or cold water of more than a specific capacity is taken out from the cold water during the ice making operation of the ice making unit 30. The specific capacity is determined based on the percentage of the cold water intake amount in the capacity of the entire cold water tank 20, and is set to a value within 30% to 70%, preferably 40%. For example, when the total capacity of the cold water tank is 1500 ml, the specific volume is set to a value within 450 ml to 1050 ml, preferably 600 ml.

Referring to <Table 1>, the case where the ambient temperature is more than 24 ℃ and less than 26 ℃, the ice making time required 12 minutes, the total capacity of the cold water cold water tank is 1500ml, the specific capacity is 600ml by way of example.

When cold water of less than 600 ml, which is a specific capacity, is taken out of the cold water tank 20 for 12 minutes during which the ice making operation is performed in the ice making unit 30, the purified water feed valve 12 during the ice making operation for 12 minutes, which is an ice making request time. Is not open. After the completion of the ice making operation is completed, the purified water feed valve 12 is opened and purified water flows into the cold water tank 20 from the purified water tank 10, and the defrosting operation is performed with the opening of the purified water feed valve 12. However, the fact that the ice-breaking operation is performed together with the opening of the purified water feed valve 12 means that the ice-breaking operation includes both the moment performed immediately before and immediately after or immediately after the purified water feed valve 12 is opened. .

That is, when cold water of less than 600 ml, which is a specific capacity, is collected, the purified water is not supplied to the cold water tank 20 during the ice making operation. Thus, the temperature of the cold water inside the cold water tank 20 does not rise, and thus the ice making operation is completed. Since the water supplied to the ice making unit 30 is maintained at a sufficiently low temperature in producing ice, ice that has been molded to approximately 10 g weight can be produced.

On the other hand, in the case where cold water with a specific capacity of 600 ml or more is withdrawn from the cold water tank 20 for 12 minutes during which the ice making operation is performed in the ice making unit 30, the purified water feed valve 12 is opened from the moment when the water intake amount exceeds 600 ml. This is because the purified water must be continuously introduced into the cold water tank 20 to stably produce cold water. In this case, unlike the case where less than 600ml of cold water is taken out, there are two control methods.

That is, if the ice water intake exceeds a certain capacity after the time when ice larger than the unfinished ice is formed by the ice making unit 30, the de-icing operation is performed, and before the time when ice larger than the unfinished ice is formed by the ice making unit 30. If the amount of water intake already exceeds a certain capacity, the ice-breaking operation is not performed.

Whether ice larger than the unfinished ice is manufactured by the ice making unit 30 may be determined as a time required to manufacture ice during ice making time. For example, if ice was produced for a period of 80% or more of the ice making time, it can be said that ice larger than unfinished ice was produced. What percentage of the ice making time is used to determine the criterion for determining whether the ice is unfinished or not depends on how even ice is produced. Thus, in addition to 90% of the ice making request time, 70% of the ice making request time, other numerical ranges may be set as a criterion for determining whether or not ice is unfinished.

Hereinafter, the description will be made as an example based on whether 80% of the ice making time is determined as an unfinished ice or not.

During the ice making operation, if about 80% of the ice making time has elapsed and the cold water is taken in a specific volume of 600 ml or more, since about 80% of the ice making time has already elapsed, the ice produced by the ice making unit 30 It is larger than unfinished ice and is equivalent to the finished ice (hereinafter referred to as quasi-normal ice). Therefore, in this case, the ice-breaking operation is performed, and quasi-normal ice is loaded into the ice reservoir 2.

If water flows into the cold water tank 20 from the purified water tank 10 during the ice making operation, the temperature of the water in the cold water tank 20 rises so as not to make ice, and even after the ice making operation continues, the size of the ice is increased. Rather than growing, rather than melting the ice produced to reduce the size of the ice will occur. For this reason, the semi-normal ice is defrosted, and only cold water is produced without making ice for the remaining ice making time.

During the deicing operation, if cold water of 600 ml or more, which is a specific volume, is taken out before about 80% of the ice making time has elapsed, since about 80% of the ice making time has not elapsed, the ice produced by the ice making unit 30 It still exists in an unfinished ice state. Therefore, in this case, if the defrosting operation is performed, a problem may occur in which unfinished ice is loaded in the ice storage 2. For this reason, unfinished ice produced by cold water, which does not perform a defrosting operation, and whose temperature has risen high enough to make ice, is melted. That is, when about 80% of the ice making time has elapsed, when cold water of 600 ml or more having a specific capacity is withdrawn, only cold water is produced as a result of the ice making operation, and ice is not produced.

The procedure of opening time control and defrosting control of the purified water feed valve 12 according to the intake amount of the cold water and the intake time point described above will be described with reference to FIG. 2. Is described as an example.

First, the ice making time is set according to the ambient temperature. That is, since the ambient temperature is 25 ° C, the ice making time is set to 12 minutes.

Next, a step of determining whether cold water of a predetermined capacity or more is withdrawn during the ice making operation is performed. For example, if less than 600 ml of cold water is taken out for 12 minutes, the purified water feed valve 12 is opened after the ice making operation is performed for 12 minutes, and the ice making operation is completed by performing the ice making operation. On the other hand, if more than 600ml of cold water is withdrawn for 12 minutes, the purified water feed valve 12 is opened from the moment over 600ml and enters the next step.

Only in the case where cold water with a specific capacity or more is taken out during the ice making operation, determining whether ice larger than unfinished ice is formed by the ice making unit 30 is performed. For example, if 600 ml of cold water is withdrawn after 9.6 minutes (80% of ice making time required) has elapsed, it is determined that ice larger than unfinished ice is formed by the ice making unit 30, and the ice making operation is performed. If more than 600ml of cold water is taken out, it is determined that the unfinished ice is formed by the ice making unit 30 and the ice-making operation is not performed.

The above-mentioned ice making request time is a value set on the basis of the case where the temperature of cold water is 2.5 degrees C or less. However, in the case where the temperature of the cold water is 2.5 ° C. or more, ice is not generated even if cold water is supplied to the ice making unit 30. Is consumed to lower the temperature of the cold water to 2.5 ° C. and eventually run out of time spent in actual deicing, resulting in unfinished ice.

Therefore, it is necessary to modify the control method of performing ice making only for a predetermined time set according to the ambient temperature. Therefore, when the temperature of the cold water is higher than the upper limit of the ice making temperature, it is preferable to perform the ice making operation by calculating the elapse of the ice making request time based on the point where the temperature of the cold water falls to the upper limit of the ice making temperature.

Here, the ice making temperature is illustrated as 2.5 ℃, it is obvious that it may be slightly higher or lower depending on the performance of the ice making unit (30). In addition, an error may occur between the measured cold water temperature and the actual cold water temperature supplied to the actual ice making unit 30 according to the position of the sensor measuring the temperature of the cold water. Tends to be measured higher than the cold water temperature supplied to. For example, when the measured cold water temperature is 2.0 ° C, the temperature of the cold water actually supplied to the ice making unit 30 may be 2.5 ° C. In consideration of such an error, a control for calculating the elapse of the ice making request time on the basis of the measured time point of the temperature of the cold water dropped to 2.0 ° C. may be performed.

Measuring the elapse of ice making time using the starting point of the ice making time calculation as an ice making temperature is called crystal ice making operation, and the frequency of incomplete ice can be drastically reduced by this ice making operation.

In order to determine the amount of cold water intake, a water level sensor (not shown) in the cold water tank 20 may be used, but a method of multiplying the elapsed time by calculating the flow rate at which the cold water intake valve 26 exits during opening may be used. . That is, if 20 ml of cold water is taken out per second when the cold water intake valve 26 is opened, it may be determined that more than 600 ml of cold water has been taken out after 30 seconds of the time when the cold water intake valve 26 is opened.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not to be limited to the details thereof and that various changes and modifications will be apparent to those skilled in the art. And various modifications and variations are possible within the scope of the appended claims.

2: ice cellar 10: water purification tank
12: purified water supply valve 14: cold water supply pipe
15: circulation pump 16: water purification intake valve
18: water level detection member 20: cold water tank
22: evaporator 24: evaporation finger
25 nozzle assembly 26 cold water intake valve
28: ice grill 30: ice making unit
40: filter part 50: ice water purifier
52: ice cold water heater

Claims (15)

A purified water tank, a cold water tank, a purified water feed valve for supplying purified water in the purified water tank to a cold water tank, and an ice making unit for deicing a portion of the cold water supplied from the cold water tank and cooling the rest;
Different ice making time is determined according to the ambient temperature.
If less than a certain capacity of cold water is withdrawn from the cold water tank during the ice making operation of the ice making unit, the purified water feed valve is opened after the ice making operation is performed for the ice making request time, and cold water with a specific capacity or more is withdrawn from the cold water tank during the ice making operation of the ice making unit. The ice water purifier, characterized in that the water supply valve is opened from the moment when the water intake exceeds the specified capacity. The method of claim 1,
The ice water purifier, characterized in that the defrosting operation is performed in the ice making unit with the opening of the purified water feed valve when cold water of less than a specific capacity is taken out from the cold water tank during the ice making operation of the ice making unit. The method of claim 1,
When cold water of a certain capacity or more is withdrawn from the cold water tank during the ice making operation of the ice making unit,
If ice larger than the unfinished ice is withdrawn from the cold water tank after the time when ice is formed by the ice making unit, a defrosting operation is performed, and from the cold water tank before the time when ice larger than unfinished ice is formed by the ice making unit. Ice water purifier, characterized in that the ice-free operation is not performed if the cold water is withdrawn above a certain capacity. The method of claim 1,
The specific capacity is ice water purifier, characterized in that 30% to 70% of the total capacity of the cold water tank. The method of claim 1,
When the temperature of the cold water in the cold water tank is higher than the upper limit of the deicing temperature, the ice making operation is performed by calculating the elapse of the deicing request time from the point of time when the temperature of the cold water falls to the upper limit of the deicing temperature. Ice water purifier. A purified water tank, a cold water tank, a purified water feed valve for supplying purified water in the purified water tank to a cold water tank, and an ice making unit for deicing a portion of the cold water supplied from the cold water tank and cooling the rest;
Different ice making time is determined according to the ambient temperature.
If less than a certain capacity of cold water is withdrawn from the cold water tank during the ice making operation of the ice making unit, the purified water feed valve is opened after the ice making operation is performed for the ice making request time, and cold water with a specific capacity or more is withdrawn from the cold water tank during the ice making operation of the ice making unit. Ice cold water heater, characterized in that the purified water feed valve is opened from the moment when the water intake exceeds the specified capacity. The method according to claim 6,
An ice cold water heater characterized in that, during the deicing operation of the ice making unit, cold water of less than a specific capacity is taken out from the cold water tank, a defrosting operation is performed in the ice making unit together with opening of the purified water feed valve. The method according to claim 6,
When cold water of a certain capacity or more is withdrawn from the cold water tank during the ice making operation of the ice making unit,
If ice larger than the unfinished ice is withdrawn from the cold water tank after the time when ice is formed by the ice making unit, a defrosting operation is performed, and from the cold water tank before the time when ice larger than unfinished ice is formed by the ice making unit. Ice-cold water heater, characterized in that the ice-free operation is not performed if the cold water is more than a certain capacity. The method according to claim 6,
The specific capacity of the ice cold water heater, characterized in that 30% to 70% of the total capacity of the cold water tank. The method according to claim 6,
When the temperature of the cold water in the cold water tank is higher than the upper limit of the deicing temperature, the ice making operation is performed by calculating the elapse of the deicing request time from the point of time when the temperature of the cold water falls to the upper limit of the deicing temperature. Ice cold water heater. Setting an ice making time according to an ambient temperature; And
Determining whether the cold water is taken out of the specific capacity from the cold water tank during the ice making operation of the ice making unit. The method of claim 11,
If the cold water is less than the specified capacity during the deicing operation, after performing the deicing operation for the deicing request time, the purified water feed valve is opened, the ice making method characterized in that the defrosting operation is performed with the opening of the purified water feed valve. The method of claim 11,
If the cold water withdraw more than a certain capacity during the deicing operation, further comprising the step of opening the water supply valve from the moment when the water intake exceeds a certain capacity. The method of claim 13,
Determining whether ice larger than unfinished ice is formed by the ice making unit. 15. The method of claim 14,
If ice larger than the unfinished ice is formed, the ice-making operation is performed, if the ice larger than the unfinished ice is not formed ice-making method characterized in that not performed.

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