KR101783221B1 - Control Method of Hybrid Type Water Supply System - Google Patents

Abstract

The present invention relates to a method of controlling a hybrid-type water supply system which calculates a discharge amount of reservoir water to maintain the quality of the reservoir water stored in a water tank, thereby maximizing energy reduction of the water supply system and allowing water to be supplied in a stable manner. The method comprises: a discharge start-up step in which a reservoir water control part determines whether a discharge start-up time is reached, and a reservoir water single supply mode is started when the discharge start-up time is determined to be reached; a flow rate estimating step in which a total power consumption of a reservoir water pump unit is obtained in real-time while segment power of the reservoir water pump unit, dynamic pressure power consumption at the maximum revolutions, and a measurement value of the flow rate at the maximum revolutions are inputted to the reservoir water control part, and the total power consumption and the measurement value are substituted into a following formula to calculate a current flow rate; a flow rate calculation step in which a current discharge amount is calculated from the current flow rate and then is added to an cumulative discharge amount; a discharge amount determination step in which the cumulative discharge amount is compared with a target discharge amount and steps from the flow rate estimating step to the flow rate calculation step are repeated until the cumulative discharge amount reaches the target amount; and a discharge completion step in which the reservoir water single supply mode is ended when the cumulative discharge amount reaches the target discharge amount, the discharge start-up time is set to a next discharge start time, and the cumulative discharge amount is initialized.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a hybrid water supply system,

The present invention relates to a control method of a hybrid water supply system, and more particularly, to a method of controlling a hybrid water supply system by integrating the discharge amount of water to maintain a good water quality in a water tank, thereby maximizing energy saving of the water supply system, And a control method of the hybrid water supply system.

Prior to this description, 'constant' means water introduced directly into the water supply system through the external water piping, and 'water storage' means tap water introduced into the water supply system once it is stored in the water tank Leave.

The water supply of the water supply is wide, and it is difficult to supply water at a constant pressure due to a large deviation of the water pressure depending on the amount of water required. Also, there is a problem that the number of stages is frequently generated due to various reasons such as breakage of the water pipe.

Therefore, in large buildings where water consumption is concentrated, a water tank facility with a water tank and a pump as the basic configuration is constructed for stable water supply or for emergency water supply or fire fighting water for a single water tank, and a water tank is firstly stored After that, water is supplied to each place of use.

However, since the water in the water tank is supplied to the user in a state in which the water pressure for water transfer is removed, much power is consumed for the operation of the pump, and the water quality deteriorates as the storage period is prolonged.

In order to solve this problem, a hybrid water supply system has been disclosed in which a single supply or a mixed supply of a constant water and a low water water is selectively performed. In order to maximize energy savings but prevent water quality deterioration of the water, constant water supply But the reservoir stored in the tank must be efficiently discharged (supplied to the user).

In the conventional hybrid water supply system technology which suggests a discharge method of the water, the water supply system disclosed by the present applicant is disclosed in Korean Patent No. 10-1704385 (registered on February 21, 2017).

In the above-described prior art, a reservation supply mode is set for water quality management of a water tank, and water is discharged according to a set time, day of week, or date.

On the other hand, a water tank water supply control device in which water is replenished through a pressure gauge provided in a water tank, although not a hybrid water supply system, is disclosed in Korean Registered Utility Model No. 20-0368336 (registered on November 10, 2004) Fig. 2 is an installation view of the water tank water supply control device. Fig.

1, the water tank water supply control device includes a float valve 3 provided for opening and closing the water supply pipe 2 in the water supply pipe 2 of the water tank 1, The controller 5 recognizes the start of the water supply through the pressure gauge 4 when the water supply is started while the water inlet 3 is lowered due to the drop of the water level, The conventional method in which the water is replenished only by the displacements of the ports by operating the motor pump 6 to replenish the water in the water tank 1 makes it possible to start the motor pump 6 frequently to improve the problem of frequent failure Respectively.

However, the above two prior arts have only a slight aspect to satisfy both energy saving and water deterioration prevention. That is, in the case of the conventional hybrid water supply system, the water is discharged at a predetermined time without grasping the discharge amount of the water, so that when the water demand is small, the water is excessively discharged and water quality deterioration may occur. On the contrary, There is a problem that unnecessary operation of the low-water-consumption pump, which consumes much energy, leads to waste of energy.

On the other hand, in the case of the water tank water supply control device, there is a similar aspect to the present invention which will be described later in that a pressure gauge 4 is provided in the water tank 1. However, this is a constitution for replenishment, It is possible to reduce power consumption due to the nature of simple replenishment of water without knowing it, and at the same time, there is a limit to use it as a purpose of preventing deterioration of water quality.

KR 10-1704385 B1 2017.02.02. KR 20-0368336 Y1 Nov. 10, 2004.

A problem to be solved by the present invention is to provide a control method of a hybrid water supply system including a method of integrating the flow rate of the water discharged from the water tank so that a predetermined amount can be discharged at a predetermined time.

According to another aspect of the present invention, there is provided a control method for a hybrid water supply system, comprising: a constant water supply mode in which a constant water pump unit under the control of a constant control unit is operated to supply only a constant to a use place; And a mixed water supply mode in which a constant water supply mode and a water storage control unit supply mutual information and a constant water supply and a water storage water supply to the use place are selectively performed, and a control method of the hybrid water supply system A discharge start step of starting the water supply single supply mode when the storage control unit detects whether or not the discharge start time has arrived; The total power consumption of the water storage pump unit is obtained in real time in a state where the disconnection power of the water storage pump unit, the dynamic pressure power consumption at the maximum number of revolutions, and the measured value of the flow rate at the maximum number of revolutions are inputted to the water storage control unit, The flow rate estimation step for calculating the current flow rate by substituting the measured value into the following equation

; Calculating a current discharge amount from the current flow amount, and adding the current discharge amount to the cumulative discharge amount; A discharge amount determination step of comparing the cumulative discharge amount with a target discharge amount and repeating the flow amount accumulation step in the flow amount estimation step until the target discharge amount is reached; And a discharge water quality management mode including a water discharge single supply mode end when the accumulated discharge amount reaches the target discharge amount, a discharge start time point to set the discharge start time point as a next discharge start point and initialize the accumulated discharge amount, .

In the control method of the hybrid water supply system of the present invention, when the number of the constants is confirmed, the single water supply mode is performed, or when the discharge pipe pressure of the water pump unit or the water storage pump unit drops, The constant pump unit or the water storage pump unit that is in a stopped state is operated to prevent the discharge pipe pressure from being lowered or the pressure of the discharge pipe is lowered in a state in which mutual information can not be exchanged, And an emergency supply mode in which the constant pump unit under control and the stationary pump unit in standstill can be operated independently to prevent the discharge pipe pressure from dropping.

The control method of a hybrid water supply system of the present invention is characterized in that when the water storage controller determines that the water pressure falls below a reference value during the execution of the single water supply mode, And a constant supply restriction mode in which the mode is executed.

In the control method of the hybrid water supply system of the present invention, when the water pressure control unit confirms that a direct water pressure equal to or higher than the set pressure is applied, the water control unit notifies the constant control unit of the fact that the constant water inflow amount And a high-pressure prevention mode in which the inflow of the constant is blocked while the low-pressure single supply mode is being executed.

According to the control method of the hybrid water supply system of the present invention, it is possible to maximize the energy saving through the water quality deterioration prevention through the water quality management mode in which the target discharge amount can be estimated by calculating the flow rate of the water discharged from the water tank in real time In addition, the water supply is stably performed through the emergency supply mode, the constant supply restriction mode, and the high pressure prevention mode, thereby improving the usability of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a view showing a water tank water supply control device as a prior art. Fig.
BACKGROUND OF THE INVENTION 1. Field of the Invention [0002] The present invention relates to a hybrid water supply system,
3 is a flowchart showing a control method of a hybrid watering system according to the present invention.
4 is a graph for explaining the correlation between the current flow rate, the number of revolutions, and the total power consumption in the control method of the hybrid watering system according to the present invention.

Prior to the description of the present invention, a hybrid water supply system for implementing the control method of the present invention will be described.

2 is a block diagram illustrating a water supply system for implementing a control method of a hybrid water supply system according to the present invention.

2, the hybrid water supply system includes a water inlet pipe unit 10 directly connected to the water main pipe A, a constant pump unit 20 connected to the water inlet pipe unit 10 on the suction side, A constant water discharge pipe section 30 connected to the discharge side of the pump unit 20, a constant control section 40 for controlling the water pump unit 20, a water storage inflow pipe section 50 connected directly to the water tank B, A water discharge pump unit 60 connected to the water discharge pipe unit 50 and a water discharge pipe unit 70 connected to the discharge side of the water storage pump unit 60. The water storage unit 70, And a control unit 80.

One end of the constant discharge pipe 31 of the constant discharge pipe portion 30 and one end of the water discharge pipe 71 of the water discharge pipe portion 70 are connected to the use pipe main pipe C so that a constant, Water is supplied to the user.

The water inlet pipe 11 is connected to the water main pipe A. The water inlet pipe 11 is connected to the water main pipe A at one end and the other end is connected to the water main pipe A, 13, a motor-operated valve 15, a first valve 17, and a constant intake-air pressure sensor 19.

The water pressure sensor 13, the electromotive valve 15, the first valve 17 and the constant intake pressure sensor 19 are sequentially disposed on the basis of the water main pipe A. The constant water inlet pipe 11, The suction side of the constant booster pump 21 of the constant pump unit 20 is connected between the closed end of the first pump 17 and the first valve 17. [

The direct water pressure sensor 13 measures the direct water pressure of the main water pipe A and transfers it to the water storage control unit 80. The electric valve 15 is connected to the PID control unit 40 of the constant control unit 40 So that the inflow amount of the water flowing into the water inlet pipe (11) from the main water pipe (A) is controlled.

The first valve 17 is normally closed so that low water flows into the constant inlet pipe 11 or conversely the constant water is prevented from flowing into the low oil inlet pipe 51 of the water storage pipe section 50, 20, it is opened when it is necessary to supply a constant to the place of use through the water storage pump unit 60.

The constant suction pressure sensor 19 measures the suction pipe pressure of the constant inlet pipe 11 and transmits it to the constant control unit 40.

Here, the direct water pressure means the water pressure of the main water pipe A, and the suction pipe pressure means the water pressure in the suction side pipe of the pump, and the discharge pipe pressure to be described below means the water pressure in the discharge side pipe of the pump.

When the first valve 17 is closed and the discharge of the water pump unit 20 is shut off when the hydraulic valve 15 is fully opened, And the suction pipe pressure in the suction side piping of the constant booster pump 21 have the same value.

2 is a manual valve that is closed when it is necessary to shut off the inflow of water for maintenance of the water supply system. Reference numeral b denotes a pressure It is a tank.

The constant pump unit 20 is configured to discharge the water flowing through the constant inlet pipe 11 to the constant discharge pipe section 30 and is constituted by a plurality of constant booster pumps 21, (Hereinafter referred to as " operation information ") is provided to the constant control unit 40. The constant control unit 40 controls the constant control unit 40 based on the PID control.

The constant discharge piping section 30 includes a constant discharge pipe 31 connected to the discharge side of the constant booster pump 21 and a second valve 33 provided in the constant discharge pipe 31 and a constant discharge pressure sensor 35, .

One end of the water discharge pipe 31 is closed and the other end thereof is connected to the main pipe C.

The second valve 33 is provided in the constant discharge pipe 31 adjacent to the main pipe C where it is to be used and is always in an opened state except for the case where it is necessary to shut off the water flow for maintenance or the like.

The discharge pressure sensor 35 measures the discharge pipe pressure of the constant discharge pipe 31 and transfers it to the constant control unit 40.

As described above, the constant control unit 40 controls the amount of opening and closing of the electric valve 15, communicates with the water storage control unit 80 in order to exchange information necessary for water supply system control, Each constant booster pump 21 of the constant pump unit 20 can be individually controlled so as to control the number of pumps, and their operation information is collected.

The low water inflow pipe section 50 has a low water inflow pipe 51 whose one end is connected to the water tub B and the other end which is connected to the constant inflow pipe 11 through the first valve 17, And a check valve 53 and a low-water suction pressure sensor 55 provided in the water supply pipe.

The check valve 53 and the low water suction pressure sensor 55 are sequentially disposed in the low-water inlet 51 on the basis of the water tank B and are connected to the check valve 53 and the first valve 17, The suction side of the water booster pump 61 of the unit 60 is connected.

The check valve 53 prevents the reverse flow of the water flowing into the low-water-inlet pipe 51 from the water tank B, and the low-water suction pressure sensor 55 measures the suction pipe pressure of the low- To the control unit (80).

The water storage pump unit 60 includes a plurality of water storage booster pumps 61 for discharging water flowing through the low-water-supply inlet pipe 51 to the water storage and discharge pipe unit 70, ) Is activated by the PID control of the storage controller 80, and the operation information is provided to the storage controller 80.

The water discharge piping section 70 is connected to the discharge side of the water booster pump 61 and includes a water discharge pipe 71 for guiding water to be discharged to the main pipe C for use, A discharge pressure sensor 73 and a third valve 75.

One end of the water discharge pipe (71) is plugged and the other end is connected to the use pipe (C).

The third valve 75 is provided in the water discharge pipe 71 adjacent to the use place main pipe C and is used when it is necessary to shut off the water flow for maintenance reasons as in the case of the second valve 33 But is always kept open.

The water discharge pressure sensor 73 measures the discharge pipe pressure of the water discharge pipe 71 and transfers it to the water storage control unit 80.

The water storage control unit 80 measures the water pressure through the water pressure sensor 13 and communicates with the constant control unit 40 to exchange information necessary for the water supply system control. In addition, it is possible to individually control each of the water booster pumps 61 of the water storage pump unit 60 so as to control the number of pumps operated according to the amount of water demanded by the user, while collecting the operation information thereof, Water quality management mode to be described later.

Hereinafter, a control method of the hybrid water supply system of the present invention will be described.

FIG. 3 is a flowchart illustrating a control method of a hybrid watering system according to the present invention. FIG. 4 is a graph for explaining a correlation between a current flow rate, the number of revolutions, and total power consumption in the control method of the hybrid watering system according to the present invention. to be.

2 to 4, the control method of the hybrid watering system of the present invention supplies water to a user using a constant single supply mode, a single water supply mode and a mixed water supply mode as basic modes, The low water quality management mode, the emergency supply mode, the constant supply restriction mode, and the high pressure prevention mode are performed.

First, the three basic modes will be briefly described. The constant single supply mode is a mode in which only a constant is supplied to the place of use under the control of the constant control unit 40, and the single water supply mode is controlled by the saving control unit 80 In the mixed water supply mode, when the water supply is not smooth during the operation in the single single supply mode or the single water supply mode, the constant control unit 40 and the water saving control unit 80 exchange information through a constant It is a mode to supply the reservoir to the place of use together.

The water storage water quality management mode is a supply mode performed for prevention of deterioration of the water quality of the storage water and supplies a certain amount (hereinafter referred to as a 'target discharge amount') of the water storage tank B to a use place through a single water supply mode. And is repeatedly performed every predetermined time (hereinafter referred to as " discharge start time ").

Usually, the water replenishment of the water tank B is performed independently of the control method of the present invention by the water supply device provided in the water tank B. When there is no water replenishment during the execution of the water storage water quality management mode, ), The suction piping pressure is linearly decreased, so that it is possible to easily finish the operation of the water quality control mode by judging whether or not the measured value has reached the suction piping pressure corresponding to the target discharge amount.

In the present invention, the discharge start step (S10), the flow rate estimation step (S20), the flow rate accumulation step (S30), and the flow rate accumulation step (S30) , A discharge amount determination step (S40), and a discharge completion step (S50).

Here, the time interval between the start of the discharge is determined as the time when the water quality of the water is lowered below the reference level when the water in the water tank (B) is left without replenishing water. Since the progress of water quality deterioration is different depending on the season, .

In addition, the water quality standards may be adopted by law, such as 'drinking water quality standards' or 'groundwater quality standards'.

In the discharge starting step (S10), the storage control unit (80) checks whether or not the discharge start time has come, and if it arrives, the storage single supply mode is started.

In the flow rate estimation step (S20), the current flow rate (Qx) is estimated through the superposition principle and the Bernoulli principle.

In other words, the proportional relationship between the flow ratio and the power ratio can be summarized as follows: the ratio of the flow rate of the pump to the flow rate ratio is proportional to the ratio of the flow rate to the power ratio, and the pressure ratio (positive maintenance) have.

Therefore, the equation for estimating the current flow rate Qx is as follows.

Here, Qmax is the maximum flow rate at the maximum rotational speed of the pump, Px is the total power consumption at the current rotational speed, Pxd is the dynamic pressure power consumption at the current rotational speed, Pmaxd is the dynamic pressure consumption at the maximum rotational speed Po is the breakdown power at the current revolution, Pmax is the total power consumption at the maximum revolution, and Pmaxo is the breakdown power at the maximum revolution.

Further, the breakdown power is the power consumption consumed in generating the positive pressure as the pump power consumption in the state where the discharge flow rate of the pump is zero. Therefore, a value (Px - Po) obtained by subtracting the current breakdown power from the current total power consumption of the pump operating at the current rotation speed is consumed in the current flow rate (Qx) discharge as the current dynamic pressure consumption power (Pxd) (Pmax - Pmaxo) obtained by subtracting the breakdown power at the maximum number of revolutions from the total consumed power at the maximum revolutions is the dynamic pressure power consumption (Pmaxd) consumed for discharging the flow rate (Qmax) at the maximum revolutions.

This is shown in the graph of the number of revolutions and the power consumption as shown in FIG.

Here, A is a measure of the power consumption of the water booster pump 61 while changing the number of revolutions in a state in which water is discharged as a total power consumption line, and B is a discrete power line, The total power consumption of the water booster pump 61 is measured and obtained.

Therefore, in the state where the sensed power Po at the current rotational speed, the dynamic pressure power consumption Pmaxd at the maximum rotational speed, and the measured value of the flow rate Qmax at the maximum rotational speed are preliminarily input to the water saving control unit 80 The total power consumption of the water booster pump 61 is checked in real time and the current flow rate Qx is calculated from the above equation.

In the flow rate accumulating step S30, the current flow rate Qx obtained through the flow rate estimating step S20 is multiplied by a time interval corresponding to the repetition period of the flow rate estimating step S20 to calculate the current discharge amount, and then adds the current discharge amount to the cumulative discharge amount .

In the discharge amount determination step S40, if the accumulated discharge amount is compared with the target discharge amount and the flow rate is less than the target discharge amount, the flow rate accumulation step (S30) is repeated in the flow rate estimation step (S20) S50).

In the discharge completion step S50, the water storage control unit 80 terminates the water supply single supply mode, notifies the constant control unit 40 that the constant single supply mode is executed, sets the discharge start time as the next discharge start time, The accumulated discharge amount is initialized to complete the operation of the water quality management mode.

The emergency supply mode is a mode in which a constant is short-circuited or a discharge piping pressure is lowered, which is performed when the information exchange between the constant control unit 40 and the water storage control unit 80 is smooth, to be.

In the case of a constant number of stages, the storage control unit 80 can determine whether the storage unit 80 is singular by measuring the pressure of the linear pressure sensor 13, and if the number of plates is confirmed, the storage single supply mode is performed.

In the case where the constant pump control unit 40 and the low water control unit 80 are smoothly exchanged, the failure of some of the pumps of the constant pump unit 20 during the execution of the single water supply mode, When the decrease is recognized through the constant discharge pressure sensor 35, the constant control unit 40 informs the water storage control unit 80 to perform the mixed water supply mode.

The second valve 33 and the third valve 75 are opened and the water discharge pipe 31 is opened as described above when the discharge piping pressure drops and communication failure occurs between the constant control unit 40 and the water storage control unit 80. [ The same discharge piping pressure is measured in each of the discharge pressure sensors 35 and 73 while the control units 40 and 80 independently control the pump units 20 and 60 So that the discharge pipe pressure drop is prevented.

In the case of constant water supply mode, even if the water pressure drops below the standard value, if the water supply is restricted for the stable water supply of the user, water supply to other uses may be inhibited. In order to prevent this, When the supply mode or the direct water pressure falls excessively below the reference value, the single water supply mode is executed.

That is, when it is detected that the water pressure is lowered below the reference value through the water pressure sensor 13, the water storage pump unit 60 is operated to supply the water to the place of use, while the water pump unit 20 Is instructed to the constant control unit 40 so that the mixed water supply mode is executed as a result.

The high pressure prevention mode is a supply mode for preventing water from being supplied to a use place at a high pressure higher than a set pressure. When it is confirmed that a direct pressure higher than a set pressure is applied through the direct pressure sensor 13, 40). During the execution of the constant single supply mode or the mixed water supply mode, the degree of opening of the electric valve 15 is controlled so that the suction pipe pressure in the constant inlet pipe 11 is reduced. During the execution of the single water supply mode The electric valve 15 is closed.

Here, the set pressure is a reference pressure for stably supplying water to the place of use, and is usually set by adding 1 to 1.5 bar at the maximum head for supplying water to the place of use.

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 limited to the disclosed exemplary embodiments, but, on the contrary, It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

10: Constant inlet pipe section
11: Constant inlet pipe 13: Direct pressure sensor
15: electric valve 17: first valve
19: Constant suction pressure sensor
20: Constant pump unit
21: Constant booster pump
30: Constant discharge piping section
31: Constant discharge pipe 33: Second valve
35: Constant discharge pressure sensor
40:
50: Water-saving inflow pipe section
51: Low Feeding Intake 53: Check Valve
55 Water intake pressure sensor
60: Water pump unit
61: Water booster pump
70: Water discharge pipe section
71: water discharge tube 73: water discharge pressure sensor
75: third valve
80:

Claims (4)

The constant water supply mode in which the constant pump unit 20 under the control of the constant control unit 40 is operated to supply only the constant to the place of use and the water supply pump unit 60 under the control of the water storage control unit 80 are operated, A hybrid water supply system control method in which a mixed water supply mode in which a constant water supply mode for supplying tens of thousands of water and a constant water supply mode for supplying tens and hundreds of water and a constant water and a water storage are simultaneously performed through mutual information exchange between the constant control unit 40 and the water storage control unit 80 In this case,
A discharge start step (S10) of starting the water supply single supply mode when the storage control unit (80) detects whether or not the discharge start time has arrived;
The storage control unit 80 is provided with a storage capacity control unit 80 for storing the segregation power Po at the current revolutions of the water storage pump unit 60, the dynamic pressure power consumption Pmax- Pmaxo at the maximum revolutions, and the flow rate Qmax at the maximum revolutions A flow rate estimating step of calculating a current flow rate Qx by obtaining the total power consumption Px of the water storage pump unit 60 in a state in which the measured value is preliminarily inputted and substituting the measured power value into the following equation S20)

;
A flow rate accumulating step (S30) of calculating a current discharge amount from the current flow rate (Qx) and adding the current discharge amount to the cumulative discharge amount;
A flow rate determination step (S40) of repeating the flow rate integration step (S30) in the flow rate estimation step (S20) until the cumulative discharge amount is compared with the target discharge amount and the target discharge amount is reached; And
A discharge completion step (S50) of finishing the water supply single supply mode when the accumulated discharge amount reaches the target discharge amount, setting the discharge start time as the next discharge start time, and initializing the accumulated discharge amount;
And a water quality management mode in which the water quality of the hybrid water supply system is controlled.
The method according to claim 1,
When the number of constants is confirmed, the single water supply mode is performed, or when the pressure of the discharge pipe of the water pump unit 20 or the water storage pump unit 60 drops, the information between the constant control unit 40 and the water storage control unit 80 The constant pump unit 20 or the water storage pump unit 60 which are in a stopped state through the exchange can be operated to prevent the discharge pipe pressure from being lowered, or when the discharge pipe pressure falls in a state where mutual information can not be exchanged, The emergency supply mode in which the water supply pump 40 or the water storage control unit 80 is under the self-control and independently operates the water pump unit 20 or the water storage pump unit 60 in the stopped state to prevent the drop of the discharge pipe pressure is included And a control unit for controlling the hybrid water supply system.
The method according to claim 1,
When the water-saving control unit 80 detects that the water pressure drops below the reference value during the execution of the single water supply mode, the water supply control unit 80 changes the water supply restriction mode so that the mixed water supply mode or the water- Wherein the hybrid water supply system includes a hybrid water supply system.
The method according to claim 1,
The storage control unit 80 informs the constant control unit 40 of the fact that a direct pressure equal to or higher than the set pressure is applied, and allows the inflow amount of the constant to be lowered during the execution of the single water supply mode or the mixed water supply mode, And a high-pressure prevention mode in which the inflow of the constant is blocked during execution.

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