JP2897565B2 - Water heater control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for supplying water to a water heater, draining water, and draining piping.

[0002]

2. Description of the Related Art In recent years, in houses that are not continuously used, such as resort condominiums, water heaters in each house have been intensively controlled from a manager's office for safety. The period during which a water heater is used in a place such as a resort apartment is often a limited period such as a weekend. Therefore, when the water heater is not used, the water of the water heater is drained to prevent deterioration of the water quality. Therefore, when using a water heater, water supply to the water heater and an operation command for the heating device are performed by remote control from a caretaker room or the like.

[0003] Conventionally, this type of water heater control device performs water supply and drainage to and from the water heater by a method as disclosed in Japanese Patent Application Laid-Open No. Hei 1-305253. Hereinafter, the method will be described with reference to FIG.

FIG. 9 is a configuration diagram of a conventional water heater. 1
Is a water heater, 2 is a water supply electric valve provided on a water supply pipe for supplying water to the water heater 1, 3 is a water discharge electric valve provided on a drain pipe for draining water in the water heater, 4 is a hot water supply pipe 5 is a first air intake valve provided in the secondary water supply pipe,
6 is a second intake valve provided on the hot water supply pipe, 7 is a control device for controlling the water supply valve 2 and the drain valve 3, 8 is a remote control panel electrically connected to the control device 7, and 9 is a secondary water supply pipe Is a mixing tap for mixing the water with the hot water from the hot water supply pipe to discharge the hot water, 10 is a first drain tap provided on the secondary water pipe, and 11 is a second drain tap provided on the hot water pipe.

FIG. 10 is an external view of a remote control panel 8 of a conventional water heater. Reference numeral 12 denotes a use switch, 13 denotes a stop switch, 14 denotes a use indicator lamp, and 15 denotes a stop indicator lamp.

The operation of the water heater configured as described above will be described. The remote control panel 8 is installed in a manager's room or the like of the resort condominium, and when the manager receives a report from the resort condominium user to visit the resort condominium, he presses the use switch 12 of the remote control panel 8. The control device 7
When the use switch 12 is pressed, the use indicator lamp 14 is turned on, a closed output is provided to the electric drain valve 3, and an open output is provided to the electric water supply valve 2. By these actions, water is supplied to the water heater 1 and the secondary water supply pipe and the hot water supply pipe. In the case of a hot water storage type water heater such as an electric water heater, since the hot water must be boiled by the time the user comes to the villa, after the hot water tank is filled with water, the control device 7 controls the heating device (not shown). Is activated.

[0007] When the manager receives a report from the resort condominium user on returning home, he presses the stop switch 13 of the remote control panel 8. The control device 7 includes a stop switch 13
Is detected, the use indicator lamp 14 is turned off, and the stop indicator lamp 15 is turned on. Further, the heating device (not shown) is stopped to output a closed output to the electric water feed valve 2 and, after a lapse of a predetermined time until the hot water in the water heater cools, to output an open output to the electric water drain valve 3, Drain the water heater.

In such a conventional water heater, in order to drain the piping around the water heater in order to prevent freezing, a stop instruction is given by the remote operation panel 8, and then the first water heater is provided in the secondary water supply pipe. Drain plug 10 and second drain plug 11 provided on the hot water supply pipe
open. When the first drain valve 10 is opened, the first intake valve 5 is opened.
Sucks air, and the water in the secondary water supply pipe is drained by the first drain plug 10.
Can be pulled out of When the second drain plug 11 is opened, the second intake valve 6 sucks air, and hot water in the hot water supply pipe can be drained from the second drain plug 11.

[0009]

In such a conventional water heater, however, the drainage of the pipe can be performed by the above-described procedure. However, after the drainage is completed, the first drainage plug 1 is stopped.
0 and the second drain plug 11 had to be closed.

If the user returns home after forgetting to close the first drain plug 10 or the second drain plug 11, the manager remotely operates the next time the user comes to the villa. Pressing the use switch 12 on the panel 8 causes the following problems. That is, since the control device 7 performs an open output to the electric water feed valve 2, the water supplied from the water supply pipe passes through the hot water supply valve 2, enters the water heater 1, and passes through the second water drain valve 11 through the hot water supply pipe.
Water keeps flowing. Further, the water supplied from the water supply pipe passes through the electric water supply valve 2 and the water continues to flow from the first drain valve 10 through the secondary water supply pipe.

Therefore, even if the user wants to return home early, the user must wait until draining is completed, which is inconvenient.

Further, even if the first drain plug 10 and the second drain plug 11 are closed after the drain is completed, the following problems still remain. When the user presses the use switch 12 on the remote control panel 8 the next time the user visits the villa, the control device 7 outputs an open output to the feed water motorized valve 2, so that the water supplied from the feed water pipe is Electric motor for water supply 2
To the water heater 1 through the hot water supply pipe, flows to the mixing tap 9 through the hot water supply pipe, and the water supplied from the water supply pipe flows to the mixing tap 9 through the secondary water supply pipe through the water supply electric valve 2. Therefore, the secondary water supply pipe and the hot water supply pipe are frozen before the user comes to the villa after the water supply. In order to prevent freezing, it is necessary to take measures such as winding an anti-freezing heater around the secondary water supply pipe and the hot water supply pipe, and the installation work for the anti-freezing heater and the electricity cost of the anti-freezing heater are burdensome.

A first object of the present invention is to provide a water heater control device which solves the above-mentioned problems, is easy to use for draining pipes for preventing freezing, and can sufficiently drain pipes for preventing freezing. Aim.

A second object of the present invention is to provide a water heater control device which is easy to use for draining pipe water and is easy to manage when centrally managing the water heater as in a resort apartment.

A third object of the present invention is to provide a control device for a water heater that allows a drainage instruction to be issued at a plurality of locations, and that can reliably issue the drainage instruction.

[0016]

In order to achieve the first object, the present invention provides a water supply motorized valve provided on a water supply pipe to a water heater, a water supply motorized valve provided on a water discharge pipe of a water heater, A secondary water supply electric valve provided on a secondary water supply pipe branched from a secondary side of the water supply electric valve, a hot water supply electric valve provided on a hot water supply pipe of the water heater,
A water drainage electric valve connected to both the secondary water supply pipe and the hot water supply pipe and provided on a water drainage pipe for discharging water in the pipe, the electric power supply water supply valve, the electric power drainage valve, the electric power supply valve for secondary water supply, A control device for controlling the hot water supply electric valve and the water drainage electric valve,
The control device is electrically connected to a remote control panel, and when a water supply instruction is given by operating the remote control panel, the water supply electric valve is opened and the secondary water supply electric valve and the hot water supply electric valve are closed. When water supply is instructed on the remote control panel for use of hot water after water supply, the electric water supply valve, the secondary water supply electric valve, and the hot water supply electric valve are opened. When a water drainage instruction is given by an operation, the water supply electric valve is closed, and the control device of the water heater is provided for opening the water drainage electric valve, the secondary water supply electric valve and the hot water supply electric valve. .

In order to achieve the second object, the present invention provides a water supply electric valve provided on a water supply pipe to a water heater, a water discharge electric valve provided on a water discharge pipe of the water heater, and the electric water supply valve. The secondary water supply electric valve provided on the secondary water supply pipe branched from the secondary side, the hot water supply electric valve provided on the hot water supply pipe of the water heater, and the water in the pipe connected to both the secondary water supply pipe and the hot water supply pipe are discharged. A water drainage electric valve provided in the drainage pipe for performing, a control device for controlling the water supply electric valve, the drainage electric valve, the secondary water supply electric valve, the hot water supply electric valve, and the water drainage electric valve, The control device is electrically connected to a central control panel for centrally controlling a plurality of water heaters, and is also electrically connected to individual operation panels provided for each of the plurality of water heaters. Until the control device opens the electric water supply valve, the operation by the individual operation panel is performed. Those having a control device for a water heater that does not accept.

In order to achieve the third object, the present invention relates to a water supply electric valve provided in a water supply pipe to a water heater, a water discharge electric valve provided in a water supply water drain pipe, and two of the water supply electric valve. The secondary water supply electric valve provided on the secondary water supply pipe branched from the secondary side, the hot water supply electric valve provided on the hot water supply pipe of the water heater, and the water in the pipe connected to both the secondary water supply pipe and the hot water supply pipe are discharged. A water drainage electric valve provided in the drainage pipe for performing, a control device for controlling the water supply electric valve, the drainage electric valve, the secondary water supply electric valve, the hot water supply electric valve, and the water drainage electric valve, The control device is electrically connected to a central control panel that centrally controls a plurality of water heaters, and is also electrically connected to individual operation panels provided for each of the plurality of water heaters, so that the central control panel and the individual operation Drain water to drain water from the piping according to the water drain instruction of one of the panels And opens the valve operating, in which a control device of the water heater to close the water supply electric valve.

[0019]

According to the present invention, when water supply is instructed by operating the remote control panel, the electric valve for water supply is opened and the electric valve for secondary water supply and the electric valve for hot water supply are closed. Prevents water from flowing out of the drain plug even if it is left open.
In the downstream side of the next water supply electric valve and the hot water supply pipe, the downstream side of the hot water supply electric valve is prevented from freezing.

Further, since the operation by the individual operation panel is not accepted until the control device opens the electric water supply valve by the water supply instruction of the centralized control panel, the water heater can be managed by the centralized control panel.

In addition, the electric valve for draining is opened and the electric valve for water supply is closed in order to drain water from the pipe in accordance with the instruction for draining either the centralized control panel or the individual operation panel. However, even if the user forgets the drainage instruction, the centralized control panel can issue the drainage instruction and prevent damage to the piping due to freezing.

[0022]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of a control device for a water heater according to the present invention.

FIG. 1 is a configuration diagram of a water heater according to a first embodiment of the present invention. Reference numeral 21 denotes a water heater, reference numeral 22 denotes a water supply motorized valve provided on a water supply pipe for supplying water to the water heater 1, reference numeral 23 denotes a motorized drainage valve provided on a drainage pipe for draining water from the water heater,
Is a secondary water supply electric valve provided on a secondary water supply pipe on the secondary side of the electric water supply electric valve 22, 25 is a hot water supply electric valve provided on a hot water supply pipe, and 26 is a water drain provided on a water drain pipe for draining piping. Motorized valve, 27
Is an air release valve with a negative pressure operated valve provided on the hot water supply pipe, 28 is a first intake valve provided on the secondary water supply pipe, and 29 is a second intake valve provided on the hot water supply pipe.
Is a control device for controlling the water supply valve 22, the drain valve 23, the secondary water supply electric valve 24, the hot water supply electric valve 25, and the water removal electric valve 26, and 31 is a remote controller electrically connected to the control device 30. An operation panel, 32 is a mixing tap for mixing the water of the secondary water supply pipe with the hot water of the hot water supply pipe to supply hot water, 33 is a first drain plug provided on the secondary water supply pipe, and 34 is a second drain plug provided on the hot water supply pipe. Drain stopper, 35
Is a water-supply-side drainage pipe branched from between the electric water supply valve 22 and the secondary water-supply electric valve 24 and connected to the electric water drainage valve 26; A pipe, 37 is a first check valve provided on a pipe branched from the water supply drainage pipe 35 and connected to the water heater 1, and 38 is a branch from the water supply drainage pipe 35 to the first check valve 37. A second check valve 39 provided on the downstream side is a third check valve provided on the hot water supply drainage pipe 36.

FIG. 2 is an external view of the remote control panel 31 according to the first embodiment of the present invention. Reference numeral 51 denotes a water supply switch, 52 denotes a use switch, 53 denotes a water drain switch, 54 denotes a water supply display switch, 55 denotes a use display switch, and 56 denotes a water drain display switch.

The operation of the water heater control device having such a configuration will be described with reference to FIG. FIG. 3 is an operation flowchart of the control device 30 according to the first embodiment of the present invention. In step 60, the process waits until the water supply switch 51 is turned on. When the user of the resort condominium contacts the manager and the manager turns on the water supply switch 51, the control device 30 detects that the water supply switch 51 has been turned on and proceeds to step 6.
The program proceeds to 1 to perform an open output to the feed water electric valve 22. Closed output is performed for the drainage electric valve 23, the secondary water supply electric valve 24, the hot water supply electric valve 25, and the water drainage electric valve 26. In this state, the water that has entered from the water supply pipe is supplied to the water heater 21 through the electric water supply valve 22 and further through the first check valve 37. When water is supplied to the water heater 21, the pressure in the water heater 21 increases, so that the air release valve 27 with the negative pressure operated valve bleeds air, and the water heater 1 is filled with water. When the water heater 21 is full, water flows out to the hot water supply pipe, but does not flow downstream from the hot water supply electric valve 25 because the hot water supply electric valve 25 is closed. Also, since the secondary water supply electric valve 24 is closed,
Water does not flow downstream of the next water supply electric valve 24. Therefore,
Even if the first drain plug 33 and the second drain plug 34 are kept open, the water will not flow.

At this time, since the electric water supply valve 22 is open, water flows into the water supply drainage pipe 35.
The flow of water is stopped by the sixth and third check valves 39. The control device 30 turns on the water supply display lamp 54.
Further, in the case of a hot water storage type water heater such as an electric water heater, the control device 30 activates a heating device (not shown) to boil the hot water before the arrival of the user.

In step 62, the process waits until the use switch 52 is turned on. When the user arrives at the resort apartment, the user first contacts the first drain plug 33 and the second drain plug.
Is closed, and the use switch 52 is turned on.
The control device 30 detects that the use switch 52 is turned on, and proceeds to step 63, where the electric water supply valve 22, the secondary electric water supply valve 24,
An open output is performed to the hot water supply electric valve 25. Electric drainage valve 2
3. A closed output is provided to the electric drain valve 26. Also,
The control device 30 turns off the water supply display lamp 54 and turns on the use display lamp 55. In this state, since the hot water supply electric valve 25 and the secondary water supply electric valve 24 are open, hot water and water are supplied to the mixing tap 32, and hot water can be used.

At this time, water flows into the hot water supply drainage pipe 36, but the flow of water is stopped by the electrically driven drainage valve 26 and the second check valve 38. If the use switch 52 is turned on without closing the first drain plug 33 and the second drain plug 34, water flows out from the first drain plug 33 and the second drain plug 34. However, at this time, since the user is present in the room, the user immediately notices that the first drain plug 33 and the second drain plug 34 are present.
Can be closed.

In step 64, the process waits until the drain switch 53 is turned on. When the user returns from the resort apartment, first, the drain switch 53 is turned on. The control device 30 detects that the drain switch 53 is turned on, and proceeds to step 65, in which the secondary water supply electric valve 24, the hot water supply electric valve 25,
An open output is performed to the electric water drain valve 26. Electric motor for water supply 2
2. A closed output is performed for the drainage electric valve 23. Further, the control device 30 turns off the use indicator lamp 55 and turns on the drain indicator lamp 56. In this state, since the electric water supply valve 22 is closed, the water supply is stopped, and the electric water drain valve 26 and the electric secondary water valve 24 are opened. Through the second check valve 38, and is discharged from the electric motor 26. Since the secondary water supply electric valve 24 is open, water can be drained not only on the downstream side (secondary side) but also on the upstream side (primary side) of the secondary water supply electric valve 24. At this time, since the first intake valve takes in air,
The water in the secondary water pipe is discharged smoothly. The hot water staying in the hot water supply pipe is also drained by the electric valve 26 and the hot water supply electric valve 25.
Is opened, the water passes through the hot water supply drainage pipe, passes through the third check valve, and is discharged from the electric draining valve 26. Since the hot water supply electric valve 25 is open, water can be drained not only on the downstream side (secondary side) but also on the upstream side (primary side) of the hot water supply electric valve 25. Also at this time, the second intake valve 29 similarly sucks air,
Hot water in the hot water supply pipe is discharged smoothly.

However, since the vertical pipe portion of the secondary water supply pipe and the hot water supply pipe near the mixing tap 32 cannot be drained, the user opens the first drain tap 33 and the second drain tap 34 to drain the water. I do. The first drain plug 33 and the second drain plug 34 do not need to be closed when draining is completed, and may be left open.

In step 66, the process waits for the lapse of time t1. The time t1 may be set to a time sufficient for draining water. If the time t1 has elapsed, the process proceeds to step 67, where the control device 30 determines whether the electric water supply valve 22 and the electric water discharge valve 2
(3) Close output is performed for the secondary water supply electric valve 24, the hot water supply electric valve 25, and the water removal electric valve 26, and the water removal is completed.

In step 68, the process waits for the time t2 to elapse. The time t2 may be set to a time sufficient for cooling the hot water in the water heater 21 together with the time t1. t
If two hours have elapsed, the process proceeds to step 69, where the control device 30
Performs an open output to the drainage electric valve 23, performs a closed output to the water supply electric valve 22, the secondary water supply electric valve 24, the hot water supply electric valve 25, and the water drainage electric valve 26, and outputs Drain the water.

In step 70, the process waits for the time t3 to elapse. The time t3 may be set to a time sufficient for draining the water in the water heater 21. If the time t3 has elapsed, the process proceeds to step 71, in which the control device 30 outputs a closed output to the electric water supply valve 22, the drainage electric valve 23, the secondary water supply electric valve 24, the hot water supply electric valve 25, and the water removal electric valve 26. Then, the drainage in the water heater 21 is completed.

As described above, when water supply is instructed by operating the remote control panel 31, the controller 30 controls the water supply electric valve 2
2 and the secondary water supply electric valve 24 and the hot water supply electric valve 2
By closing 5, even if the first drain plug 33 and the second drain plug 34 are in the open state, the water does not keep flowing. Furthermore, since the secondary water supply electric valve 24 and the hot water supply electric valve 25 are closed, the secondary water supply pipe 2
Water does not flow downstream of the next water supply electric valve 24 and downstream of the hot water supply electric valve 25. Therefore, the secondary water supply pipe and the hot water supply pipe on the downstream side of the secondary water supply electric valve 24 and the hot water supply electric valve 25 are prevented from freezing after the water supply instruction is given on the remote control panel 31 and before the use instruction is given. can do.

When a water draining instruction is given by operating the remote control panel 31, the control device 30 opens the electric water draining valve 26 and opens the secondary water supply electric valve 24 and the hot water supply electric valve 25. Water can also be drained from the pipes on the upstream side of the secondary water supply electric valve 24 and the hot water supply electric valve 25. Therefore, freezing of the piping can be prevented. Further, at this time, the first drain plug 33 and the second drain plug 34 do not need to be closed when draining is completed, and may be left open. Therefore, the resort condominium user needs to wait until the drain is completed. It is easy to use because you can return home immediately.

FIG. 4 is a configuration diagram of a water heater according to a second embodiment of the present invention. The same components as those in the first embodiment are given the same numbers. Reference numeral 45 denotes a water supply motorized valve, which uses a three-way valve. The three ports of the electric water supply valve 45 are connected to a water supply pipe, a secondary water supply pipe, and a water supply drainage pipe 46, respectively. A connecting pipe 47 connects the secondary side of the first check valve and the drainage motorized valve 23. In the second embodiment, the water supply electric valve 45 is a three-way valve in order to omit the second check valve 38 and the third check valve 39 used in the first embodiment. The electric water drain valve 26 has a hot water supply drainage pipe 3 branched from the hot water supply pipe.
Only 6 is connected, and the water supply drainage pipe is not connected.

The operation is almost the same as in the first embodiment. When water supply is instructed by the remote control panel 31, the water supply motorized valve 45 connects the water supply pipe to the secondary water supply pipe. In addition, remote control panel 3
When draining is instructed in step 1, the water supply motorized valve 45 communicates the secondary water supply pipe with the water supply drainage pipe 46 to drain the water from the secondary water supply pipe. The electric drain valve 26 drains the hot water supply pipe.

As described above, according to the second embodiment, the water supply electric valve 45 is a three-way valve, so that the second check valve 38 and the third check valve used in the first embodiment are used. 39 can be omitted, the first
The same effect as that of the embodiment is exhibited.

FIG. 5 is a configuration diagram of a water heater according to a third embodiment of the present invention. The same components as those in the first and second embodiments are given the same numbers. In the third embodiment, similarly to the second embodiment, the electric water supply valve 45 is a three-way valve, and the electric water drain valve 26 is connected to only the hot water supply drainage pipe 36 branched from the hot water supply pipe. Although the pipes are not connected, the secondary water supply pipe and the hot water supply pipe are provided on the lower surface so as to serve as underfloor pipes. Further, a water heater intake valve 82 is provided in the middle of the pipe from the secondary water supply pipe to the water heater 21. Further, instead of the remote control panel 31, a central control panel 80 and an individual control panel 81 are electrically connected to the control device 30. Centralized control panel 80 is connected to control devices for a plurality of water heaters. In addition, the individual operation panel 81
It is provided corresponding to each of the plurality of water heaters.

FIG. 6 is an external view of a centralized control panel 80 according to a third embodiment of the present invention. A central control switch 83 is a central control switch for room 101 of the resort apartment building in this example. Reference numeral 84 denotes a centralized control lamp, which is turned on when the control device 30 in the room 101 is in a state of supplying or using water in this example.

FIG. 7 is an external view of an individual operation panel 81 according to a third embodiment of the present invention. Reference numeral 85 denotes an individual operation switch, which in this example is an individual operation switch provided in room 101 of the resort apartment building. Reference numeral 86 denotes an individual operation lamp, which is turned on when the control device 30 in the room 101 is in use in this example.

The operation is almost the same as that of the second embodiment,
The difference will be mainly described with reference to FIG. FIG. 8 is an operation flowchart of the control device 30 according to the third embodiment of the present invention. First, at step 90, the control device 30 waits for the central control switch 83 to be operated. In FIG.
The switch is abbreviated as SW. Step 90
Does not accept the individual operation switch 85. Step 9
If the central control switch 83 is operated at 0, the control device 3
If it is 0, it is determined that the water supply instruction has been received, and the process proceeds to step 91. In step 91, the same operation as step 61 in FIG.
Water is supplied to 1 (water supply state). The control device 30 turns on the central control lamp 84 and keeps the individual operation lamp 86 off. In step 91, “water supply electric valve 45
“Open” indicates a state in which the three-way valve of the electric water supply valve 45 connects the water supply pipe to the secondary water supply pipe. Incidentally, "water supply electric valve 45 → closed" indicates a state in which the secondary water supply pipe and the water supply drainage pipe 46 are communicated.

After the water supply state is established in step 91, the operation of the individual operation switch 85 is accepted in step 92. The user of the resort apartment operates the individual operation switch 85 after arriving at the resort apartment, and the control device 3
If 0 is detected that the individual operation switch 85 has been operated, it is determined that a use instruction has been received, and the process proceeds to step 93 to be in a use state. The control device 30 turns on the individual operation lamp 86 while keeping the central control lamp 84 turned on.

After the operation state is set in step 93, the operation of the central control switch 83 is accepted in step 94, and
Further, in step 95, the operation of the individual operation switch 85 is accepted. If either the central control switch 83 or the individual operation switch 85 has been operated, step 96
To drain the water. The control device 30 turns off the central control lamp 84 and the individual operation lamp 86.

When draining is instructed by the central control switch 83 of the central control panel 80 or the individual operation switch 85 of the individual operation panel 81, the water retained in the vertical pipe of the hot water supply pipe at the mixing tap 32 is supplied to the second intake valve. 29 is discharged from the water drainage motor valve 26 by sucking air. In addition, mixing tap 32
Residual water in the vertical pipe of the secondary water supply pipe of the part is supplied to the secondary water supply electric valve 24 from the mixing tap 32 side in the opposite direction to the normal flow of water by the first intake valve 28 sucking air. It flows to the valve 45 side, and is discharged via the feed water electric valve 45. Therefore, the first drain plug 28 and the first drain plug 29 used in the first and second embodiments are not required. After step 97, the operation is the same as in the second embodiment.

As described above, according to the third embodiment, the first drain plug 33 and the second drain plug 34 used in the first embodiment and the second embodiment are not required. Therefore, if the drainage is instructed by the centralized control panel 80 or the individual operation panel 81, the control device 30 automatically drains the water, so that the resort condominium user does not need to operate the drainage plug and is very convenient. It is. Furthermore, even if the resort apartment user forgets the drainage instruction on the individual operation panel 81 and returns home, if the manager checks the central control lamp 84 of the central control panel 80 and lights it, the drainage instruction is given. Since it is determined that the drainage has not been performed, the manager issues a drainage instruction on the central control panel 80, and the control device 30 can drain the water.

Further, water supply is instructed by the central control panel 80,
Until the control device 30 opens the electric water supply valve, the operation of the individual operation panel 81 is not accepted.
By the time the user operates 0, the resort condominium user cannot use the water heater 21 by operating the individual operation panel without permission. Therefore, it is easy for the manager to manage the water heater 21.

It should be noted that, as the control device 30 for realizing the above-described embodiment, various types of configurations such as a configuration using a microcomputer or a configuration using a discrete circuit are generally considered.

Although the mixing tap and the drain tap are described in one place in the embodiment, a plurality of places may be used.

The same effect can be obtained when the mixing tap 32 or a normal faucet is used instead of the drain tap without using the first drain tap 33 and the second drain tap 34. Needless to say.

[0051]

As is apparent from the above embodiments, the control device for a water heater according to the present invention is electrically connected to a remote control panel, and when a water supply instruction is given by operating the remote control panel, the water supply is controlled. When the electric valve is opened, the secondary water supply electric valve and the hot water supply electric valve are closed, and when the use instruction is given on the remote control panel for use of hot water after water supply, the water supply electric valve and the secondary water supply are used. The electric valve and the hot water supply electric valve are opened, and when a drainage instruction is given by operating the remote control panel, the water supply electric valve is closed and the water drainage electric valve and the secondary water supply electric valve are closed. Opening the hot water supply electric valve has the following effects. (1) When water supply is instructed by operating the remote control panel,
The control device opens the water supply electric valve and closes the secondary water supply electric valve and the hot water supply electric valve, so that water does not flow even when the drain plug is in the open state. Further, since the secondary water supply electric valve and the hot water supply electric valve are closed, water does not flow downstream of the secondary water supply electric valve in the secondary water supply pipe and downstream of the hot water supply electric valve in the hot water supply pipe. Therefore, it is possible to prevent the secondary water supply pipe and the hot water supply pipe on the downstream side of the secondary water supply electric valve and the hot water supply electric valve from freezing after the water supply instruction is given by the remote control panel and before the user gives the use instruction. can do. (2) When the drainage is instructed by operating the remote control panel, the control device opens the electric valve for draining water and opens the electric valve for secondary water supply and the electric valve for hot water supply, whereby the electric valve for secondary water supply and hot water supply are opened. Water can be drained from the pipe upstream of the motor-operated valve. Therefore, the freezing of the piping can be prevented over a wide range. Further, at this time, the drain plug does not need to be closed when draining is completed, and may be left open, so that the user can return home immediately without having to wait until the drain is completed, which is convenient.

Further, the water heater control device of the present invention is electrically connected to a central control panel for centrally controlling a plurality of water heaters, and electrically connected to individual operation panels provided for each of the plurality of water heaters. Connected, since the operation by the individual operation panel is not accepted until the control device opens the water supply motorized valve according to the water supply instruction of the centralized control panel, the user can operate the centralized control panel without permission. Even when the individual operation panel is operated, the hot water heater cannot be used, and the manager can easily manage the hot water heater.

The water heater control device of the present invention is electrically connected to a central control panel for centrally controlling a plurality of water heaters, and also electrically connected to individual operation panels provided for each of the water heaters. According to one of the draining instructions of the centralized control panel and the individual operation panel, the drainage electric valve is opened to drain the water in the pipe and the water supply electric valve is closed. Even if the operator forgets the drainage instruction on the operation panel and returns home, the manager can issue a drainage instruction on the centralized control panel and the control device can drain the water, so it is possible to reliably prevent the piping from freezing. it can.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a water heater according to a first embodiment of the present invention.

FIG. 2 is an external view of a remote control panel according to the first embodiment.

FIG. 3 is an operation flowchart of the control device according to the first embodiment;

FIG. 4 is a configuration diagram of a water heater according to the second embodiment.

FIG. 5 is a configuration diagram of a water heater according to the third embodiment.

FIG. 6 is an external view of a centralized control panel according to the third embodiment.

FIG. 7 is an external view of an individual operation panel according to the third embodiment.

FIG. 8 is an operation flowchart of the control device according to the third embodiment.

FIG. 9 is a configuration diagram of a conventional water heater.

FIG. 10 is an external view of the remote control panel.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 21 Hot water supply device 22 Electric motor valve for water supply 23 Electric motor valve for drainage 24 Electric motor valve for secondary water supply 25 Electric motor valve for hot water supply 26 Electric valve for draining water 30 Control device 31 Remote control panel 33 First drain valve 34 Second drain valve 80 Centralized control Panel 81 Individual operation panel

Continuation of the front page (56) References JP-A-1-305253 (JP, A) JP-A-3-28662 (JP, A) JP-A-6-174305 (JP, A) JP-A-1-112365 (JP) , U) (58) Field surveyed (Int.Cl. ⁶ , DB name) F24H 1/18 301 F24H 9/16

Claims (3)

(57) [Claims] 1. A water supply electric valve provided in a water supply pipe to a water heater, a water discharge electric valve provided in a water discharge pipe of the water heater, and a secondary water supply pipe branched from a secondary side of the water supply electric valve. A secondary water supply motorized valve, a hot water supply motorized valve provided on a hot water supply pipe of the water heater, and a water drainage motor provided on a drainage pipe connected to both the secondary water supply pipe and the hot water supply pipe for discharging water from the pipe. A valve, a control device for controlling the water supply electric valve, the drainage electric valve, the secondary water supply electric valve, the hot water supply electric valve, and the water drainage electric valve, wherein the control device is electrically connected to a remote control panel. When water supply is instructed by operating the remote control panel, the electric valve for water supply is opened and the electric valve for secondary water supply and the electric valve for hot water supply are closed. When the use instruction is given on the operation panel, the water supply electric valve and the secondary water supply electric valve are The hot water supply electric valve is opened,
A control device for a water heater that closes the electric valve for water supply and opens the electric valve for water drainage, the electric valve for secondary water supply, and the electric valve for hot water supply when a water drainage instruction is issued by operating the remote control panel. 2. A water supply motorized valve provided on a water supply pipe to the water heater, a drainage motorized valve provided on a water discharge pipe of the water heater, and a secondary water supply pipe branched from a secondary side of the water supply motorized valve. A secondary water supply motorized valve, a hot water supply motorized valve provided on a hot water supply pipe of the water heater, and a water drainage motor provided on a drainage pipe connected to both the secondary water supply pipe and the hot water supply pipe for discharging water from the pipe. A valve, a control device for controlling the water supply electric valve, the drainage electric valve, the secondary water supply electric valve, the hot water supply electric valve, and the water drainage electric valve, wherein the control device centrally controls a plurality of water heaters. It is electrically connected to the central control panel and also electrically connected to the individual operation panels provided in each of the plurality of water heaters. Until the control device opens the electric water supply valve by the water supply instruction of the central control panel. A control device for a water heater that does not accept an operation by the individual operation panel. 3. A water supply motorized valve provided in a water supply pipe to the water heater, a drainage motorized valve provided in a drainage pipe of the water heater, and a secondary water supply pipe branched from a secondary side of the water supply motorized valve. A secondary water supply motorized valve, a hot water supply motorized valve provided on a hot water supply pipe of the water heater, and a water drainage motor provided on a drainage pipe connected to both the secondary water supply pipe and the hot water supply pipe for discharging water from the pipe. A valve, a control device for controlling the water supply electric valve, the drainage electric valve, the secondary water supply electric valve, the hot water supply electric valve, and the water drainage electric valve, wherein the control device centrally controls a plurality of water heaters. It is electrically connected to the centralized control panel and also electrically connected to the individual operation panels provided for each of the plurality of water heaters. Hot water supply to open the electric water drain valve and close the electric water supply valve to drain water Machine control device.