JPH0791711A - Equipment for detecting and shutting off leakage of water and method for detecting leakage of water - Google Patents

Abstract

PURPOSE:To exclude fluctuation of a water pressure and thereby to determine a leakage of water efficiently by a method wherein control valves are provided on the inflow and outflow sides of pipings for cold and hot water provided for air conditioners, water leakage measuring sections are set thereby, a pressure drop in these sections is detected and occurrence of the leakage of water is determined on the basis of the detection. CONSTITUTION:The inflow and outflow sides of a cooling coil 4a for each of a plurality of AHU(air handling unit) 4 being air conditioners are connected to a supply water pipe 2a and return water pipe 3a for cold water, while the inflow and outflow sides of a heating coil 4b are connected to a supply water pipe 2b and a return water pipe 3b for hot water. In a system constructed as stated above, control valves V1 and V2 are provided for inflow-side and outflow-side connection pipes of the AHU 4 respectively and thereby water leakage measuring sections 7 are provided. On the other hand, pressure sensors S1 and S2 are provided for the inflow-side and outflow-side connection pipes of the control valves V1 and V2 respectively. In a controller 5, occurrence of a leakage of water is determined from a value of drop of a pressure on the basis of the respective detection signals of the pressure sensors S1 and S2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water leakage detection shutoff device and a water leakage detection method, and more particularly to a fan coil unit (FCU) and an air handling unit (A) installed in a building or the like.
The present invention relates to a shutoff device for detecting leakage of cold and hot water pipes arranged in an air conditioner such as HU) and a detection method thereof.

[0002]

2. Description of the Related Art In a device for cooling and heating pipes using cold and hot water for cooling and heating, if a water leak occurs and is left unattended, the building will deteriorate and become unusable in some cases. You will fall. Therefore, there is known a device for detecting water leakage when the air conditioner, the pipe, etc. are corroded or damaged or the fluid leaks, by decreasing the flow rate of the fluid or the pipe internal pressure or increasing the differential pressure. Further, there is also known a means for closing the electromagnetic valve at a specific location in response to a signal from a water leak sensor provided at a critical location such as a pipe.

[0003]

However, the flow rate,
The flow velocity, pressure, and differential pressure vary widely, and changes due to air conditioner and piping leaks are diverse, and devices that detect this and block the flow path must operate in response to different conditions. I have to. Further, the above-mentioned water leakage sensor can detect only water leakage at the location where the sensor is arranged. Therefore, in order to improve the effectiveness of water leakage detection, it is necessary to provide a sensor everywhere in the pipeline.

The present invention has been developed in view of the above-mentioned problems, and detects water leakage in a pipe in which a plurality of AHUs using cold / hot water are installed and outputs failure information instantaneously. , It is an object of the present invention to provide a water leakage detection shutoff device and method for preventing accidents due to water leakage.

[0005]

[Means for Solving the Problems] In order to achieve the above object, a control valve is provided on the inflow side and the outflow side of a pipe for cold and hot water in which an air conditioner such as FCU or AHU is disposed on the way to measure water leakage. A section is formed, pressure detection means is arranged in this water leakage measurement section, the output of this pressure detection means is connected to a controller, and the presence or absence of water leakage is detected by the pressure drop value in the water leakage measurement section. The configuration is characterized by that.
In this case, the above-mentioned controller has at least one system each of a pressure measuring unit, a comparison calculation unit, a time measuring unit, a valve control unit and an input / output unit, which are electronic circuits using a microcomputer, contact points or Is preferably composed of a non-contact sequence control circuit network, and a plurality of controllers are connected to the centralized supervisory control device.

Further, control valves are provided on the inflow side and the outflow side of the cold / hot water pipe in which an air conditioner such as an FCU or AHU is installed on the way to form a water leak measuring section, and when a water leak is detected, the air conditioner is used. While operating, close the control valve to seal cold / hot water, and after a certain period of time, open only the inflow side control valve to reseal cold / hot water and measure the pressure in the leak measurement section after resealing. Therefore, the water leakage detection method is adopted, which is characterized by detecting the water leakage. In this water leakage detection method, it is preferable to control the resealing time depending on the magnitude of the initial pressure during resealing. In addition, a control valve is provided on the inflow side and the outflow side of the cold / hot water pipe in which an air conditioner such as FCU or AHU is disposed on the way to form a leak measurement section,
It is also possible to adopt a leak detection method characterized by closing the outflow side control valve at the time of leak detection and closing the inflow side control valve after a certain period of time to measure the pressure in the leak measuring section. . In this case, water leakage can be detected by the same method even when the air conditioner is not operating.

In each of the water leak detection methods described above, the plurality of controllers connected to the centralized monitoring control device are
It is preferable to detect water leakage individually or simultaneously by a control signal from the centralized monitoring control device. If water leakage is not detected during pressure measurement, the controller opens both control valves described above and automatically returns.On the other hand, if water leakage is detected, the centralized monitoring controller or controller is reset manually. If both or both of the control valves are configured to open and return, and any or all of the control valves do not operate, the controller outputs a failure occurrence signal corresponding to the valve that did not operate, and the failure occurrence signal Is output, it is preferable to manually reset the centralized monitoring controller or controller to operate the control valve.

[0008]

Since the present invention has the above-described configuration and method, when the centralized monitoring control device reaches a predetermined time, the controller (microcomputer) is instructed to start water leakage detection, and the valve control unit of the controller A valve closing signal is output via the input / output unit, and control valves provided in the inflow side and outflow side pipes of an air conditioner such as FCU or AHU are closed to form a water leakage measurement section. The water temperature of the cold and warm water enclosed in this water leakage measurement section shifts to the temperature in the atmosphere with the passage of time and its pressure also fluctuates, and is stable at a certain water pressure when there is no water leakage. At this time, the pressure detection means outputs a detection signal according to the water pressure in the leak measurement section, and this pressure detection signal is measured by the pressure measurement section via the input / output section of the controller, and this measurement value is set to the initial value. Take in as.

After that, the timer section of the controller measures the time for an arbitrary time, and after the lapse of the arbitrary time, measures the water pressure in the water leakage measuring section again. This measurement result is sent to the comparison calculation unit and is compared and calculated with the previously obtained initial value.When this calculation result falls below a predetermined fixed value, the controller determines that water leakage has occurred, and water leakage detection A signal is output to notify the centralized monitoring and control device that water has leaked. In this case, while measuring the water pressure in the leak measurement section, if the air blower means (fan, etc.) of the air conditioner is in the operating state, the heat exchange of the cold / hot water enclosed in the cooling coil or the heating coil in the air conditioner can be performed. It can be accelerated and the fluctuation of water pressure can be made more prominent. In addition, the air conditioner can perform water leak determination in the operating state or the stopped state.

As a result of measuring the water pressure in the water leakage measuring section, if no water leakage is detected, the valve control unit of the controller outputs a valve opening signal via the input / output unit to open each control valve and restore the original state. Return to. However, when water leakage is detected, each control valve is not reset. In this case, after the pipe line is appropriately repaired, the centralized monitoring control device or controller is manually reset, and each control valve is opened by this reset signal to restore the original state. Also, to form the above-mentioned water leakage measurement section,
When opening or returning each control valve, if either or both of the control valves did not operate, the input / output part of the controller did not operate. Judge as a failure. Then, the controller outputs, via the input / output unit, a failure occurrence signal corresponding to the control valve that did not operate to the centralized supervisory control device to notify the system that a failure has occurred. In this case, after the control valve is appropriately repaired in the same manner as described above, the centralized monitoring control device or controller is manually reset, and each control valve is opened by this reset signal to return to the original state.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the water leak detection shutoff device and the water leak detection method to which the present invention is applied will now be described in detail with reference to the drawings. FIG. 1 to FIG. 3 are diagrams showing the configuration of the water leakage detection shutoff device according to the present embodiment and the state of connection to the piping system. On each floor of an arbitrary n-story building, one or more AHUs (air handling units) 4 including, for example, a fan section, a cooling coil section, a heating coil section, a filter section, etc. are installed.
The inflow side of the HU4 is connected to the water pipe 2 via a connecting pipe,
The outflow side is connected to the return water pipe 3 via a connection pipe. In addition,
In this embodiment, an air handling unit is used as an air conditioner for explanation, but the present invention is not limited to this and the FCU is not limited to this.
It may be a (fan coil unit).

The circulation of cold and hot water to the AHU 4 on each floor is performed by the heat source device 1 including a water pump, etc., but the water supply pipe 2 and the return pipe 3 through which the cold and warm water is guided to each floor are shown in FIG. As described above, the circulation of cold water and the circulation of hot water are guided by the pipes of different systems. That is, the cooling coil 4 of the AHU 4
The inflow side of a is connected to the cold water supply pipe 2a, and the outflow side of the cooling coil 4a is connected to the cold water return pipe 3a.
The inflow side of the heating coil 4b of the HU 4 is connected to the hot water supply pipe 2b, and the outflow side of the heating coil 4b is the hot water return pipe 3b.
Connected to. In this embodiment, two AHUs 4 are provided for each floor, but any number of AHUs 4 may be used. When a plurality of AHUs 4 are installed in this way, each AHU 4 must be connected in parallel.

A water leakage detection / interruption device is provided in the above AHU4 piping system. As shown in the respective drawings, the water leakage detection shutoff device of the present embodiment has control valves V1 (V1 ') and V2 (V2') connected to a controller 5 via valve control lines 10 (10 ') and 11 (11'). Are electrically connected, and pressure sensors S1 (S1 ') and S2, which are pressure detecting means, are connected via signal lines 8 (8') and 9 (9 ').
(S2 ') is electrically connected. Control valve V1 (V
1 ') is provided in the inflow side connection pipe of AHU4, and the control valve V2 (V2') is provided in the outflow side connection pipe of AHU4, and a water leakage measurement section 7 (7 ') is formed. Further, in the water leakage measurement section 7 (7 ′), the control valve V1
A pressure sensor S1 (S
1 ') is provided, and a pressure sensor S2 (S2') is provided at the inflow side connecting pipe of the control valve V2 (V2 ').

By the way, the controller 5 of this embodiment is constituted by a microcomputer 500 as shown in FIG. This microcomputer 500
The mutual operation of the hardware and software configures a pressure measuring unit 501, a comparison calculation unit 502, a valve control unit 503, a time measuring unit 504, and the like, and an input / output unit 505 is connected to the microcomputer 500. It The input / output unit 505 is connected to the centralized monitoring control device 6, and the control valves V1 (V1 ′) and V2 described above are also connected.
(V2 ') and pressure sensors S1 (S1') and S2 (S
2 ') is connected, an operation display unit 506 indicating the operation state of the controller 5 is connected, and further, a reset switch 507 for returning the control valves V1 (V1') and V2 (V2 ') is connected. ing. in this way,
The input / output unit 505 of this embodiment includes all interfaces such as an AD converter and various drivers.

As described above, the controller 5 connected to the piping system of the AHU 4 on each floor is electrically connected to the central monitoring control device 6 through the control line 12, and according to the instruction of the central monitoring control device 6. Leakage in the piping system on each floor is detected. In this embodiment, since the controller 5 connected to the piping system of the AHU 4 on each floor is so-called intelligent, detailed data on the result of water leak detection on each floor, system failure, etc. is sent to the centralized supervisory controller 6. On the contrary, the controller 5 connected to the piping system of the AHU 4 on each floor can be controlled simultaneously or individually by operating the centralized supervisory controller 6.

As described above, the water leakage detection shutoff device of this embodiment is an intelligent controller 5 on each floor.
Since the centralized monitoring and control device 6 is remotely controlled, the method for detecting water leakage, etc.
It is largely controlled by the software installed in 00. The method of water leak detection in this embodiment is shown in the flowchart of FIG.

First, the water leakage detection and shutoff device of this embodiment is provided with a method in which the controller 5 provided on each floor independently monitors the presence or absence of water leakage in the piping system of the AHU 4. In addition, there is also a method of receiving a command from the centralized monitoring control device 6 and monitoring the presence or absence of water leakage in the piping system of the AHU 4 installed on each floor every scheduled time. In this case, the control valve V1 (V1 ') and Both of V2 (V2 ') are closed to form a leak measuring section 7 (7'), and after a certain time, only the control valve V1 (V1 ') is once opened to leak measuring section 7
Cold and hot water is sealed again in (7 ') to monitor the presence or absence of leakage. Further, similarly to the method described above, there is a method of receiving a command from the centralized monitoring control device 6 and monitoring the presence or absence of water leakage in the piping system of the AHU 4 installed on each floor at every scheduled time. Valve V2 (V2 ')
The control valve V1 (V1 ') is closed after a fixed time after closing, and the presence or absence of water leakage in the water leakage measurement section 7 (7') is monitored.

Next, the operation of this embodiment will be described with reference to the flowchart of FIG. In this flowchart,
Pa is a reference set pressure value in the water leakage measurement section 7 (7 ′), Pb is a reference set pressure value on the inflow side during normal operation of the AHU4, and Pc is a reference set pressure on the outflow side during normal operation of the AHU4. It is a value. P1 and P2
Are pressure sensors S1 (S1 ′) and S2 (S
2 ′), and t1, t2, and t3 are time values used by the clock unit 504 of the controller 5. In this embodiment, the variables Pa, Pb and Pc are
By applying a value slightly lower than the standard value obtained in the normal case where water is not leaking, the controller 5 avoids making an erroneous decision. The variables Pa, Pb, and Pc have different cold and hot water source pressures on each floor of the building. For this reason,
Although it is necessary to change the set value for each controller 5, all the numerical values relating to the above variables can be changed to arbitrary values by a command from the centralized monitoring control device 6.

First, the controller 5 is always responsive to the command from the centralized monitoring control device 6 to constantly detect the pressure sensor S1 (S1 ').
And the pressure detection signals sent from S2 (S2 '). With this pressure detection signal, the pressure is measured by the pressure measuring unit 501 via the input / output unit 505 of the microcomputer 500, and P1 and P2 are obtained as measured values. Then, the measured values P1 and P2 are compared with the reference set pressure values Pb and Pc which are the reference set pressure values in the comparison calculation unit 502.

As a result of the comparison calculation, the measured values P1 and P2 are P
When the values of b and Pc are less than the values, the controller 5 determines that water leakage has occurred, and the valve control unit 503 sets the input / output unit 50.
A valve closing signal is output via 5 and each control valve V1
(V1 ′) and V2 (V2 ′) are closed, and the centralized monitoring and control device 6 is notified that water leakage has occurred. At this time, the lamps, LEDs, etc. provided in the operation display unit 506 also display according to the state. However, each control valve V1 may be changed depending on other conditions instructed by the centralized monitoring controller 6.
When (V1 ') and V2 (V2') are closed, these processes are not performed.

In this way, when the piping system of the AHU 4 is cut off due to water leakage, the piping system is appropriately repaired to eliminate the cause of the water leakage, and then the central monitoring control device 6 or the controller 5 is manually reset. The valve control unit 503 of the microcomputer 500 is the input / output unit 50.
A valve opening signal is output via 5 and each control valve V1
(V1 ′) and V2 (V2 ′) are opened, and the microcomputer 500 informs the centralized supervisory controller 6 that the normal operation is restored.

Next, the centralized monitoring controller 6 instructs the microcomputer 500 of the controller 5 to start the water leakage detection at a predetermined time. When the microcomputer 500 receives the water leakage detection start command, the valve control unit 503 outputs a valve closing signal via the input / output unit 505, and the control valve V1 (V1) provided on the connection pipes on the inflow side and the outflow side of the AHU4. ') And V2 (V2') are closed to form a water leakage measurement section 7 (7 '). Then, the clock unit 504 of the microcomputer 500 clocks an arbitrary time given by the variable t1, for example, 90 seconds. During this time, the cold / hot water in the cooling coil 4a or the heating coil 4b of the AHU 4 shifts to the temperature in the atmosphere and its pressure fluctuates with the lapse of time, and usually stabilizes at a certain constant water pressure.

When the time measurement is completed, the valve control unit 503 of the microcomputer 500 once opens the control valve V1 (V1 ') provided in the connection pipe on the inflow side of the AHU 4 to cool or warm water in the water leakage measurement section 7 (7'). Is closed again, and the control valve V1 (V1 ′) is closed again. At this time, the re-encapsulation time for re-sealing the cold / hot water in the water leakage measurement section 7 (7 ′) can be appropriately changed depending on the magnitude of the initial pressure in the water leakage measurement section 7 (7 ′). Leakage measurement section 7
When the cold / hot water is sealed again in (7 ′), the pressure measuring unit 501 of the microcomputer 500 causes the pressure sensor S1
The water pressure in the water leakage measurement section 7 (7 ') is measured by the pressure detection signals of (S1') and S2 (S2 '), and this measured value is taken as the initial value of the variables P1 and P2. But,
At this time, if the measured values P1 and P2 are too low, it is determined that there is water leakage or device failure, and the centralized monitoring and control device 6 is informed that water leakage or other abnormality has occurred.

Then, the clock unit 504 of the microcomputer 500 uses an arbitrary time given by the variable t2, for example, 6
Time measurement is performed for 0 seconds, and after the time measurement, water leakage measurement section 7 (7 ')
Measure the water pressure again. This measurement result is sent to the comparison calculation unit 502 of the microcomputer 500 and is compared with the previously obtained initial values P1 and P2. This calculation result is a constant value given by the variable Pa, for example, the initial value 1
When it falls below / 2, it is determined that water leakage has occurred, and the controller 5 outputs a water leakage detection signal to notify the centralized monitoring controller 6 that water leakage has occurred. Water leakage is detected,
Control valve V1 after the AHU4 piping system is shut off
The method of restoring (V1 ′) and V2 (V2 ′) is as described above, and therefore its explanation is omitted. In addition, leak measurement section 7
As a result of measuring the water pressure at (7 ′), if no water leak is detected, the valve control unit 5 of the microcomputer 500
03 outputs a valve opening signal via the input / output unit 505 to open each control valve V1 (V1 ') and V2 (V2') to restore the original state.

In addition to the above-described water leakage detection method, this embodiment has a subroutine for another water leakage detection method that operates as follows. According to this, as described above, the centralized monitoring control device 6 instructs the microcomputer 500 of the controller 5 to start the water leakage detection at a predetermined time, and the valve control unit 503 of the microcomputer 500 causes the input / output unit to operate. A valve closing signal is output via 505 to close the control valve V2 (V2 ') provided in the connection pipe on the outflow side of the AHU4. Then, the process shifts to the subroutine processing, and the time measuring unit 50 of the microcomputer 500
4 measures the arbitrary time given by the variable t3, for example, 90 seconds. When the time measurement ends, the microcomputer 50
The valve control unit 503 of 0 outputs a valve closing signal via the input / output unit 505, closes the control valve V1 (V1 ′) provided in the connection pipe on the inflow side of the AHU 4, and measures the water leakage measurement section 7
(7 ') is formed. After that, the process returns to the main routine to perform the above-described water leak detection process.

When measuring the water pressure in the water leakage measuring section 7 (7 '), if the fan 4c of the AHU 4 is in an operating state, the cooling coil 4a and the heating coil 4b in the AHU 4 will be operated.
The heat exchange of the cold and warm water enclosed in is promoted, and the fluctuation of the water pressure can be made more remarkable. Therefore, the water pressure in the water leakage measurement section 7 (7 ′) can be stabilized in a short time, so that even if the source pressure of the cold / hot water supplied is low as in the upper floors of the building, the controller 5 changes the water temperature. It is possible to easily determine whether the water pressure is changed due to water leakage or the water pressure is changed due to water leakage. But AH
Since the fan 4c of U4 does not necessarily have to be operated, the fan 4c can be stopped if necessary.

The above-mentioned water leak measuring section 7 (7 ') is formed, and each control valve V1 (V1') and V2 (V2 ').
When one or both of the control valves V1 (V1 ') and V2 (V2') do not operate when opening and returning, the input / output unit 505 of the microcomputer 500 does not operate. V1 ') or V2 (V
2 ') receives a signal for opening degree information output, the control valve V1
It is determined to be a failure of (V1 ') or V2 (V2'). Then, the microcomputer 500 outputs a failure occurrence signal corresponding to the control valve V1 (V1 ') or V2 (V2') which did not operate to the centralized monitoring controller 6 via the input / output unit 505, and the system Informs you that a failure has occurred. In this case, the control valve V1 (V
1 ') or V2 (V2') is appropriately repaired, and then the central monitoring controller 6 or the controller 5 is manually reset to control valves V1 (V1 ') and V1.
2 (V2 ') is released to restore the original state.

As described above, in each of the water leak detection methods of this embodiment described above, when forming the water leak measuring section 7 (7 '), cold and hot water is refilled or the control valve V1 (V1').
And the closing order of V2 (V2 ') has a special feature,
Water leakage can be effectively detected even if the measurement conditions are not constant. Moreover, this embodiment can be implemented at a very low cost because it is composed of only general and inexpensive members.

[0029]

As is apparent from the above description, according to the water leakage detection shutoff device and the water leakage detection method of the present invention, the water pressure fluctuation due to the water temperature change in the water leakage measurement section can be effectively eliminated to efficiently detect the water leakage. It is possible to carry out the above, and it is possible to detect the water leak of the pipe in which the AHU is installed, and it is possible to deal with it instantly.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing a piping system of an AHU installed on each floor of a building.

FIG. 2 is a detailed view of the AHU piping system.

FIG. 3 is a schematic diagram showing a configuration of a controller.

FIG. 4 is a flowchart showing operations of water leakage detection and interruption.

[Explanation of symbols]

 4 AHU 5 controller 6 centralized monitoring control device 7 water leakage measurement section 500 microcomputer 501 pressure measuring unit 502 comparison operation unit 503 valve control unit 504 timing unit 505 input / output unit 506 operation display unit 507 reset switch S1, S2 pressure sensor V1, V2 Control valve

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kazuo Asada 4-1-1, Honmachi, Chuo-ku, Osaka City, Osaka Prefecture Takenaka Corporation, Osaka Main Store 4th-13th Takenaka Corporation Osaka Main Store (72) Inventor Akira Nakamori 4th-13th Honmachi, Chuo-ku, Osaka City, Osaka Prefecture Takenaka Corporation Osaka Main Store (72) Inventor Azuma Azuma Shin, Takenaka Engineering Co., Ltd. Osaka Main Store

Claims (10)

[Claims] 1. A leak measurement section is formed by providing control valves on the inflow side and the outflow side of a pipe for cold and hot water in which an air conditioner such as an FCU or an AHU is disposed on the way, and a pressure detection is performed in this leak measurement section. Means for arranging means, the output of this pressure detecting means is connected to a controller, and the presence or absence of water leakage is detected by the drop value of the pressure in the water leakage measuring section. 2. The above controller has at least one system each of a pressure measuring unit, a comparison operation unit, a time measuring unit, a valve control unit, and an input / output unit, which are electronic circuit networks using a microcomputer. The water leakage detection / interruption device according to claim 1, which is constituted by a contact or non-contact sequence control circuit network. 3. The water leakage detection / interruption device according to claim 1, wherein a plurality of controllers are connected to the centralized monitoring control device. 4. A water leakage measuring section is formed by providing a control valve on the inflow side and the outflow side of a pipe for cold and hot water in which an air conditioner such as FCU or AHU is arranged on the way to form a water leak measuring section. While operating, close the control valve to seal cold / hot water, and after a certain period of time, open only the inflow side control valve to reseal cold / hot water and measure the pressure in the leak measurement section after resealing. A leak detection method characterized in that the leak is detected accordingly. 5. The water leakage detection method according to claim 4, wherein the resealing time is controlled according to the magnitude of the initial pressure at the time of resealing. 6. A control valve is provided on the inflow side and the outflow side of a pipe for cold and hot water in which an air conditioner such as FCU or AHU is disposed on the way to form a leak measuring section, and an outflow side control valve is detected when a leak is detected. Is closed, and the pressure in the water leakage measurement section is measured by closing the inflow side control valve after a lapse of a certain time. 7. The water leakage detection according to claim 4, 5 or 6, wherein a plurality of controllers connected to the centralized monitoring control device detect water leakage individually or simultaneously by a control signal of the centralized monitoring control device. Method. 8. If water leakage is not detected during pressure measurement, the controller opens both control valves described above and automatically returns. On the other hand, if water leakage is detected, the centralized monitoring controller or controller is manually operated. The water leakage detection method according to claim 4, wherein the control valve is reset and the control valves of both of them are opened to return to the original state. 9. The water leakage detection method according to claim 4, wherein when any or all of the control valves do not operate, the controller outputs a failure occurrence signal corresponding to the valve that did not operate. . 10. The water leakage detection method according to claim 4, wherein when a failure occurrence signal is output, the centralized monitoring controller or controller is manually reset to operate the control valve.