JPH06174304A - Device for feeding-discharging water in hot water storage type hot water supplier - Google Patents

Abstract

PURPOSE:To prevent insects and the like from entering from a drainage outlet and a piping from being rendered to a rupture owing to freezing by draining water in the piping of a hot water supplier and water in a hot water storage tank after users of a resort apartment, etc., go back home. CONSTITUTION:A controller 8 of a wata feeding-discharging device of a hot water storage type hot water supplier is electrically connected with a concentrated control board 7 for controlling a plurality of hot water supply type hot water suppliers. The controller 8 closes a water supply solenoid valve 3 with the aid of operation from the concentrated control board 7 and closes a hot water supply motor driven valve 5 and opens a drainage motor driven valve 9, whereby all water in the piping is drained, and thereafter the drainage motor driven valve 9 is closed. Further, after the passage of a predetermined time (about 100 hours), hot water in a hot water storage tank 1 is made cold and a drainage motor driven valve 6 is opened to drain the water in the hot water storage tank 1, and thereafter (about 1 hour) the drainage motor driven valve 6 is closed, so that all water in the hot water storage hot water supplier and in the piping is drained to prevent freezing from being produced and insects and foreign matter from entering.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water supply / drainage device for a hot water storage type water heater used in resort apartments and the like.

[0002]

2. Description of the Related Art In recent years, interest in resorts has increased due to an increase in leisure time and changes in people's consciousness of life. The housing situation in the resort area is changing from a traditional cottage by house to an apartment house such as a resort condominium in terms of price, management, and enhancement of facilities. Most of the actual usage of such resort condominiums is long-term absence and irregular use of users, so from the viewpoint of safety, the hot water supply equipment of each house can be centrally controlled from the administrator's room, or can be accessed remotely using a telephone line. The operation (tele-control) has come to be performed. Electric water heaters are mainly used in such resort condominiums because they are easy to use, do not require refueling, are safe because the heat source is electricity, are easy to manage, etc. The face is raised.

The electric water heater is a water storage type hot water supply apparatus in which water is stored in a tank having a capacity of 150 to 460 liters and is heated by an electric heater. When supplying water, consider the water supply after long-term non-use and wash the inside of the hot water storage tank. Also, if you leave water in the hot water storage tank during a period when you do not use the electric water heater due to a long absence, such as a resort apartment, the water may deteriorate, and there is a risk of freezing in cold regions, etc. It is necessary to drain the water in the hot water storage tank. When draining water, consider the effect on the drainage pipe of the condominium and drain the hot water in the hot water storage tank after it has been cooled.

FIG. 3 shows a block diagram of an electric water heater in a resort condominium. Hereinafter, the system operation of the water heater in the conventional resort condominium will be described with reference to FIG. 1
Stores hot water supplied from the water source in the hot water storage tank with the heater 12 in the hot water storage tank, and the user is supplied from the hot water in the hot water storage tank 1 and the water supply source through the secondary water supply pipe in the Karan 2 Use by mixing with water. Reference numeral 3 is a water supply motor-operated valve provided in a water supply pipe for supplying water from the water supply source to the hot water storage tank 1.

Reference numeral 4-1 is a first check valve for preventing the water supplied from the water supply pipe to the hot water storage tank 1 from flowing backward. Reference numeral 5 denotes a hot water supply motor-operated valve provided in a hot water supply pipe for supplying hot water from the hot water storage tank 1 to the currant 2. Reference numeral 6 denotes a drainage electric valve provided in a drainage pipe for draining the water in the hot water storage tank 1 from the drainage port of the hot water storage tank 1. Reference numeral 7 denotes a centralized control panel which is provided in a manager's room or the like and centrally manages the water heaters of the resort condominiums.
Reference numeral 8 denotes a control device that controls the opening / closing of the water supply motor-operated valve 3, the hot water supply motor-operated valve 5, and the drainage motor-operated valve 6 according to a command from the centralized control panel 7.

FIG. 4 shows an external view of the centralized control panel 7. Thirteen
Is a power supply display means for displaying power ON / OFF of the centralized control panel 7. When the power supply display means 13 is lit,
It shows that the central control board 7 is electrically connected to the water heater for each house. Reference numeral 14 is a door-by-door water heater usage status display means for displaying the usage status of each water heater. When the door-to-door water heater usage status display means 14 is lit, it means that the water heater is being used in the displayed house.

Reference numeral 15 is a door-by-door water heater ON / OFF switching means for instructing water supply / drainage to the water heater installed in each door. When the user informs about the visitor, the water heater ON / OFF switching means 15 corresponding to the water heater of the user's house instructs the water heater to supply water. Also, when the user informs him / her of returning home, the water heater ON / OFF switching means 15 for each door instructs the water heater to drain water. That is, the administrator can operate the door-to-door water heater ON / OFF switching means 15 to give a water supply / drainage instruction to the water heater of each door.

The controller 8 receives a water supply instruction from the centralized control panel 7, closes the hot water supply electric valve 5, opens the electric water supply valve 3 and the drainage electric valve 6, and cleans the hot water storage tank 1. After washing for a certain period of time, the water supply electric valve 3 is opened, the hot water supply electric valve 5 and the drainage electric valve 6 are closed, and water is supplied into the hot water storage tank 1. During water supply, the air vent valve 11 provided in the hot water supply pipe is opened to release the air in the hot water storage tank 1 during the water supply. Water supply flow rate sensor 10-
At 1, the flow rate of the water supplied from the water supply source through the water supply pipe is detected, and the preset hot water storage amount of the hot water storage tank 1 and the full water content of the hot water storage tank 1 are detected from the water supply water amount. Electric water supply valve 3 when full water of hot water storage tank 1 is detected
And the heater 12 energizes the water in the hot water storage tank 1.

When the user uses the hot water from the hot water storage tank 1 through the hot water supply pipe to the hot water 2 and the secondary water supply pipe branched from the secondary side of the electric water supply valve 3, the hot water 2 is supplied.
Mix the water to be supplied to and use it at an appropriate temperature.

Further, when the drainage instruction is received from the centralized control panel 7, the control device 8 performs the drainage operation. Considering the influence of warm waste water in the hot water storage tank 1 on the drain pipe, etc., drainage electric valve 3, hot water supply electric valve 5, drainage electric valve 6 are closed, and hot water storage tank 1
Wait for the hot water inside to cool down. After the hot water in the hot water storage tank 1 is sufficiently cooled, the water supply electric valve 3 and the hot water supply electric valve 5 are closed, and the drainage electric valve 6 is opened to drain the water in the hot water storage tank 1. After a certain period of time, the drainage motor-operated valve 6 is closed. By closing the drainage motor-operated valve 6, foreign matter such as insects is prevented from entering the hot water storage tank 1 when it is not used for a long period of time.

[0011]

However, in such a conventional hot water storage type water heater, when the resort condominium or the like is used in a cold region, the hot water storage tank 1 can be drained, but the water supply pipe and the hot water supply pipe are provided. Since the water in the secondary water supply pipe cannot be discharged, the water in the pipe may freeze and the pipe may burst.

In order to prevent the pipe from bursting, it is necessary to either prevent the water in the pipe from freezing or drain the water in the pipe. In order to prevent the water in the pipe from freezing, a freeze prevention heater or the like must be wound around the pipe, which is very disadvantageous in terms of cost. Even if the secondary water supply pipe and the hot water supply pipe are provided with a manual drain valve (not shown) as a means for draining the water in the pipe, the user has some performance items and is not easy to use. Met.

For example, when the user forgets to open the manual drain valve when returning home as the first operation of the manual drain valve when returning from a resort condominium to his home (hereinafter referred to as returning home) Will not be drained and the pipe will burst.
Furthermore, when the user forgets to close the drainage manual valve after the drainage is finished as the second operation of the manual drainage valve when returning home, the user comes to the resort apartment next time (hereinafter referred to as Kuriso).
At times, if the manager contacts the manager and issues a water supply instruction with centralized control, water will leak from the water supply source to the manual drain valve through the secondary water supply pipe. Or from the water source to the hot water supply pipe → hot water storage tank →
Water leaks from the route of hot water supply valve → hot water supply pipe → manual drain valve. If the manual drain valve is closed during drainage, water will remain in the pipe, causing pipe rupture. In addition, the remaining water will be deteriorated, causing corrosion of the pipe. Therefore, even if the user wants to return home early, he / she must wait until the drainage is completed.

When returning home, it is necessary to open the manual drain valve, wait until the drainage is completed, and close the manual drain valve after the drainage is completed, which is inconvenient.

A first object of the present invention is to solve the above problems and to provide a water heater that drains water in a pipe and prevents the pipe from bursting, has high safety and is easy to use.

Further, as a second object, in order to provide a more convenient water heater, the completion of drainage of water in the pipe is detected to prevent foreign matter such as insects from entering.

A third object is to prevent corrosion of the pipe by preventing water below the detectable flow amount of the drainage flow sensor of the drain pipe from remaining inside the pipe after the drainage is completed.

[0018]

In order to achieve the first object of the present invention, the present invention relates to a hot water storage hot water heater and a water supply motor operated valve provided in a water supply pipe for supplying water from a water supply source to a hot water storage tank of the water warmer. And a drainage electric motor valve provided in a drainage pipe connected to the drainage outlet of the hot water storage tank, a hot water supply electric valve provided in a hot water supply pipe for supplying hot water from the hot water outlet of the hot water storage tank to Karan, and from the secondary side of the water supply electricity supply valve. A drainage motorized valve for draining water in both the branched secondary water supply pipe and the hot water supply pipe, a central control panel for centrally controlling a plurality of water heaters, and a control electrically connected to the central control panel This control device, when the water supply motorized valve is “closed”, drains water in the pipe by the water drainage motorized valve, closes the water drainage motorized valve after a certain time, and further after the certain time, the drainage motorized A control device for draining the inside of the hot water storage tank by a valve A.

In order to achieve the above second object, the present invention provides a hot water storage type water heater, a water supply motor operated valve provided in a water supply pipe for supplying water from a water supply source to a hot water storage tank of the water heater, and drainage of the hot water storage tank. A drainage electric valve provided in a drainage pipe connected to the mouth, a hot water supply electric valve provided in a hot water supply pipe for supplying hot water from the hot water outlet of the hot water storage tank to the currant, and a branch 2 from the secondary side of the water supply electric valve.
Electric water drain valve that drains water in both the next water supply pipe and the hot water supply pipe, a flow sensor that is provided in the water drain pipe to detect the flow rate of the water drain pipe, and a centralized control for controlling multiple water heaters It consists of a control panel and a control device electrically connected to the central control panel, and when the water supply motor operated valve is "closed", the control device drains the water in the pipe by the water drainage motor operated valve and controls the flow rate. The water drainage electric valve is closed when the flow rate detected by the sensor is exhausted, and a control device for draining the water in the hot water storage tank by the drainage electric motor valve after a certain period of time is further provided.

Further, in order to achieve the above-mentioned third object, according to the present invention, the water in the pipe is drained by the water drainage electric valve when the water supply electric valve is "closed" in the central control panel, The water drainage motor valve is closed after a certain time has passed since the flow rate detected by the flow sensor has disappeared, and a control device for draining the water in the hot water storage tank by the drainage motor valve after a certain time has passed.

[0021]

According to the present invention, the electric water supply valve is closed and the water drain motor valve is opened to drain the water in the pipe when the central control board is instructed to drain the water. After a certain period of time, the water drain motor valve is closed to prevent foreign matter such as insects from entering. Also,
Close the water drain motor valve to prevent water leakage due to opening the water drain motor valve at the next use.

Further, with the above structure, the drainage flow rate sensor detects the flow rate in the drainage pipe to detect the end of drainage in the pipe.

Further, water below the flow rate detectable by the drainage flow rate sensor opens the drainage motor valve for a certain period of time after the drainage flow rate sensor detects the drainage flow rate, and drains all the water in the pipe.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a controller for a water heater according to the present invention will be described below with reference to the drawings. FIG. 1 is a configuration diagram of a water supply / drainage device for a water heater according to a first embodiment of the present invention. Reference numeral 1 denotes a hot water storage tank that stores water supplied from a water supply source. 2 is a curran, which is a faucet when the user uses water (hot water) adjusted to an appropriate temperature. Reference numeral 3 denotes a water supply motor-operated valve provided in a water supply pipe for supplying water from a water supply source, and a water supply pipe for supplying water from a side (secondary side) of the hot water supply motor-operated valve 3 which is not connected to the water supply source (secondary side). , 2 of the secondary water supply pipe that supplies water to Karan 2
It is branched into two tubes.

Reference numeral 4-1 is a first check valve, in which water supplied from the water supply pipe to the hot water storage tank 1 flows back from the hot water storage tank 1 to the water supply source, the water supply pipe, and the secondary water supply pipe to the calan 2. Try not to. Reference numeral 10-1 denotes a water supply flow rate sensor 1 provided in the water supply pipe, which detects the flow amount of water supplied from the water supply source to the hot water storage tank 1 through the water supply pipe. Hot water storage tank 1
The water is supplied to the water source → the water supply motor-operated valve 3 → the water supply pipe → the water supply flow rate sensor 10-1 → the first check valve → from the water supply port in the hot water storage tank 1 and is connected to the hot water supply port of the hot water storage tank 1. The air in the hot water storage tank 1 is evacuated by the air vent valve 11 provided in the hot water supply pipe.

The water supplied into the hot water storage tank 1 is heated by the heater 1.
It is heated by 2 and becomes warm water. The hot water heated in the hot water storage tank 1 is supplied from the hot water supply pipe to the hot water supply motor operated valve 5 provided in the hot water supply pipe.
The water is supplied from the water supply source to the user by being mixed with the water supplied from the water supply source through the secondary water supply pipe so as to have an appropriate temperature.

Reference numeral 4-2 is a second check valve provided in the drain pipe connected to the hot water supply pipe. Further, 4-3 is a third check valve provided in the water drain pipe provided in the secondary water supply pipe. The second check valve 4-2 is from the water supply source to the hot water supply pipe through the drain pipe, and the third check valve 4-3 is the water to the secondary water supply pipe through the drain pipe. Each backflow is prevented, and when the water supply motor-operated valve 3 is opened, a drain pipe is taken from the water supply pipe to prevent the hot water supply pipe from flowing into the water.

Reference numeral 6 denotes a drainage motor-operated valve provided in a water distribution pipe connected to the drainage port of the hot water storage tank 1. Reference numeral 9 denotes a water draining motor valve provided on the water draining pipe in which the water draining pipe connected to the hot water supply pipe and the water draining pipe connected to the secondary water supply pipe are combined into one. Further, a water supply pipe that connects the flowing water flow rate sensor 10-1 and the first check valve 4-1 is also connected to the water drain pipe connected to one.

Reference numeral 7 is installed in a manager's room or the like, and instructs the controller 8 to supply water (hot water) / drain by contacting the user.
The control device 8 gives instructions such as opening / closing instructions of the water supply electric valve 3, the hot water supply electric valve 5, the drainage electric valve 6, and the water draining electric valve 9.

Hereinafter, description will be made based on the actual usage conditions in the resort condominium. When the user informs the manager about the visit, the manager uses the central control panel 7 to connect the electric water heater corresponding to the room owned by the user to the central control panel 7 described above.
The hot water supply instruction is performed by operating the door-to-door water heater ON / OFF switching means. When the controller 8 receives a hot water supply instruction from the centralized control panel 7, the water supply motor-operated valve 3 and the drainage motor-operated valve 6 are opened for a certain period of time to clean the hot water storage tank 1.

When the cleaning of the inside of the hot water storage tank 1 is completed, the controller 8 closes the drainage motor-operated valve 6 and the water supply motor-operated valve 3 remains open, and the water supply to the hot water storage tank 1 is started. The water supply flow rate sensor 10-1 detects the water supply flow rate, and the preset amount of water that can be stored in the hot water storage tank 1 and the flow rate and the water supplied from the water supply source through the water supply pipe are supplied. Whether the hot water storage tank 1 is full or not is determined from the time when the hot water is stored.
When the hot water storage tank 1 is filled with water, the heater 12 heats the water in the hot water storage tank 1 to warm water.

When the user uses the hot water in the hot water storage tank 1, the controller 8 is operated by operating the hot water supply switch (not shown) of the hot water heater panel (not shown) in the resort condominium.
Opens the hot water supply electric valve 5, and the hot water in the hot water storage tank 1 is supplied with hot water from the hot water storage tank 1 → hot water supply electric valve 5 → hot water supply pipe → caran 2
Hot water is supplied through the route. Also, from the water supply source to the water supply motor operated valve 3
→ Secondary water supply pipe → Water is supplied by the route of Karan 2 and Karan 2
It is mixed with the hot water supplied at.

When the user returns home and operates a water draining switch (not shown) of a water heater using panel (not shown) in the resort condominium, the control unit 8 closes the water supply motor-operated valve 3 to supply hot water. The valve 5 is opened, and the water drain motor-operated valve 9 is opened. At this time, the drainage motor-operated valve 6 remains closed. Since the water in the water supply pipe is connected to the water drain pipe, the water drain motor-operated valve 6 remains closed. Further, the water in the secondary water supply pipe is drained from the water drain motor-operated valve 9 through the water drain pipe connected to the secondary water supply pipe. Further, the hot water in the hot water supply pipe is drained from the water drain motor-operated valve 9 through the water drain pipe which is also connected to the hot water supply pipe. This will drain all the water in the pipe.

The water in the secondary water supply pipe on the upper part of the caran 2 and the hot water supply pipe in FIG. 1 can be drained by the user opening the caran 2. (These draining operations are called draining operations. The state of each motorized valve during the draining operation is
The water supply electric valve 3 is closed, the hot water supply electric valve 5 is opened, the drainage electric valve 6 is closed, and the water draining electric valve 9 is opened. ) The water draining operation ends after 1 hour, and all electric valves are closed. By closing the water drain motor valve 9, the invasion of insects from the water drain pipe is prevented.

The hot water in the hot water storage tank 1 is hot (about 85 ° C.)
Since it is boiled in the water, if it is drained as it is, it may affect the water distribution pipe. Therefore, a certain time (about 1
(00 hours), and when the hot water in the hot water storage tank 1 reaches a low temperature (about 40 ° C.), the drainage electric valve 6 is opened, and the hot water in the hot water storage tank 1 having a low temperature is drained. The drainage motor-operated valve 6 is opened after a fixed time (about 1 hour, depending on the capacity of the hot water storage tank 1). By closing the drainage motor-operated valve 6, invasion of insects and the like can be prevented as in the closing operation of the water drain motor-operated valve 9 described above.

If the user does not operate the water draining switch (not shown) of the water heater using panel (not shown) at the time of returning home, the manager's centralized control panel 7 ON / OFF
A similar operation is performed in response to a drainage instruction by operating the switching means 15, hot water in the hot water storage tank 1 and drainage in the pipe can be drained, and freeze prevention in the pipe can be performed.

FIG. 2 is a block diagram of a water supply / drainage device for a water heater according to a second embodiment of the present invention. The same numbers are given to the same components as in the first embodiment. The different point 10-2 is a drainage flow rate sensor for detecting the flow rate drained from the drain pipe.
The operation when the user comes to visit us is the same as in the first embodiment. The water draining operation when the user returns home is similar to that of the first embodiment, but the drainage flow rate sensor 10-2 is connected to the water draining tube, and the drainage pipe during the water draining operation, the secondary water supply pipe, Also, the end of drainage can be detected from the hot water supply pipe.

While the drainage flow rate of the drainage flow rate sensor 10-2 is maintained, the water supply motor-operated valve 3 and the drainage motor-operated valve 6 are closed, and the hot water supply motor-operated valve 5 and the water drain motor-operated valve 9 are opened to allow the drainage of the inside of the pipe. Therefore, it is possible to prevent the pipe from bursting due to the freezing of water in the pipe.
When the drainage flow rate of the drainage flow rate sensor 10-2 is exhausted, all the motor-operated valves are closed to eliminate an unnecessary open period of the water drainage motor-operated valve 9 to prevent insects and the like from entering the pipe.

The structure of the third embodiment is the same as that of the second embodiment, and the operation when the user visits the home is the same as that of the first and second embodiments. It is the second by the water draining action when the user comes home.
In the embodiment, the drainage flow rate sensor 10-2 cannot detect the drainage flow rate, that is, the hot water supply electric valve 5 and the water draining electric valve 9 are closed at the time when the drainage is completed. Water below the detected flow rate remains inside the pipe. Although the water remaining inside the pipe does not cause the pipe to burst due to freezing, it is not discharged by the closing of the water drain motor-operated valve 9 and deteriorates. One of the actual usage conditions of resort condominiums is that the deterioration of the residual water inside the pipe may lead to corrosion of the pipe due to long-term unused by the user.
Therefore, all the water in the pipe can be drained by opening the hot water supply motor-operated valve 5 and the water drain motor-operated valve 9 for a fixed time (about 20 minutes) from the time when the drainage flow sensor 10-2 runs out of water. You can

In any of the configurations of the present invention, even if the user forgets to operate the water draining switch when returning home, water is operated by the administrator by operating the door-to-door water heater ON / OFF switching means 15 of the centralized control panel. The pulling operation is possible.

The control device 8 uses a microcomputer to implement the above embodiment.
Alternatively, various configurations such as a discrete circuit are generally considered. Further, in the embodiment, the currant and each motor-operated valve are described at one place, but they may be provided at a plurality of places.

[0042]

As is apparent from the above embodiments, the water supply / drainage device for the hot water storage water heater according to the first embodiment of the present invention is electrically connected to the centralized control panel, and the centralized control panel electrically feeds water. When the valve is closed, the drainage motor valve drains the water in the pipe, the water drainage motor valve is closed after a certain time, and the drainage motor valve drains the water in the hot water storage tank after a certain time. By providing the drainage motorized valve for a certain period of time, the water in the pipe is drained and freezing is prevented. Furthermore, by closing after opening, insects and foreign substances can be prevented from entering, and water leakage due to opening of the drain valve at the time of next use can be prevented.

Further, the water supply / drainage device for the hot water storage type water heater of the second embodiment includes a flow rate sensor provided in the water drain pipe for detecting the flow rate of the water drain pipe, and a central control panel for centrally controlling a plurality of water heaters. , Electrically connected to the central control panel, the central control panel drains the water in the pipe when the water supply motorized valve is "closed", and the drainage motor operates when the flow rate detected by the flow sensor disappears. By closing the valve and further providing a control device that drains the water in the hot water storage tank by the drainage motor valve after a certain time, the drainage motor valve is opened until the drainage flow rate in the pipe runs out, and Drain and prevent freezing. In addition, by closing the water drainage motor valve immediately after the drainage motor valve finishes draining the inside of the pipe, invasion of insects and foreign matter is improved.

Further, the water supply / drainage device of the hot water storage type water heater of the third embodiment, when the water supply electric valve is "closed" in the central control panel,
The drainage motor valve drains the water in the pipe, the drainage motor valve is closed after a certain time after the flow rate detected by the flow rate sensor has disappeared, and the drainage motor valve drains the water in the hot water storage tank after a certain time. By installing a control device, after the drainage flow sensor detects the completion of drainage, by opening the water drain motor valve for a certain period of time, water below the flowrate that can be detected by the flowrate sensor is discharged within a certain period of time. Since the amount of water is small and does not deteriorate, the drainage pipe is not affected.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a first embodiment of the present invention.

FIG. 2 is a configuration diagram of the second embodiment.

[Figure 3] Configuration diagram of a conventional hot water storage type hot water heater for resort condominiums

FIG. 4 is an external view of a centralized control panel according to first to third embodiments of the present invention.

[Explanation of symbols]

 1 Hot Water Storage Tank 2 Caran 3 Water Supply Motorized Valve 4-1 First Check Valve 4-2 Second Check Valve 4-2 Third Check Valve 5 Hot Water Supply Motorized Valve 6 Drainage Motorized Valve 7 Central Control Panel 8 Control Device 9 Water-operated motorized valve 10-1 Water supply flow rate sensor 10-2 Drainage flow rate sensor

Claims (3)

[Claims] 1. A hot water storage type water heater, a water supply electric valve provided in a water supply pipe for supplying water from a water supply source to a hot water storage tank of the water heater, and a drainage electric valve provided in a drain pipe connected to a drain port of the hot water storage tank. , A hot water supply electric valve provided on a hot water supply pipe for supplying hot water from the hot water outlet of the hot water storage tank to the currant, and draining water in both the secondary water supply pipe branched from the secondary side of the electric water supply electric valve and the hot water supply pipe It consists of a water drainage motor valve, a centralized control panel for centrally controlling a plurality of water heaters, and a control device electrically connected to the centralized control panel. The control device controls the water supply when the water supply motorized valve is closed. A water supply / drainage device of a hot water storage water heater, wherein water in a pipe is drained by a drainage motor valve, the water drainage motor valve is closed after a certain period of time, and the water in the hot water storage tank is drained by the drainage motor valve after a certain period of time. 2. A hot water storage type water heater, a water supply electric valve provided in a water supply pipe for supplying water from a water supply source to a hot water storage tank of the water heater, and a drainage electric valve provided in a drainage pipe connected to a drainage port of the hot water storage tank. , A hot water supply electric valve provided in a hot water supply pipe for supplying hot water from the hot water outlet of the hot water storage tank to the currant, and water for draining water in both the secondary water supply pipe branched from the secondary side of the electric water supply electric valve and the hot water supply pipe A drainage motorized valve, a flow rate sensor for detecting the flow rate of the drainage pipe provided in the drainage pipe, a centralized control panel for centrally controlling a plurality of water heaters, and a control electrically connected to the centralized control panel This control device, when the water supply motorized valve "closed", the control device drains water in the pipe by the water drainage motorized valve, and closes the water drainage motorized valve when the flow rate detected by the flow rate sensor disappears, After a certain period of time, the drainage motor-operated valve Supply and discharge unit of the hot water storage type water heater to drain. 3. The water supply electric valve "closed" in the central control panel
Occasionally, the water in the pipe is drained by the water drainage motor valve, the water drainage motor valve is closed after a certain time has passed since the flow rate detected by the flow sensor has disappeared, and the drainage motor valve is used by the drainage motor valve after a certain time. The water supply / drainage device for a hot water storage water heater according to claim 2, further comprising a control device for draining the water inside.