JPH0229539A - Control method for hot water supply apparatus - Google Patents

Abstract

PURPOSE:To prevent wasting of a large quantity of hot water by stopping hot water supply regardless of the water level in a bath tub when a specified period of time elapses since start of hot water supply to the bath tub. CONSTITUTION:When the temperature and water level are set by a temperature setting device 20 and a water level setting device 22 respectively, and a hot water supply switch 21 is ON, a control circuit 17 is put into operation. A burner 4 starts burning in response to the signal, and water flows along a hot water supply pipe 2 and is heated by a hot water supply heat exchanger 3. A first inlet 10a of a three-way switching valve 10 is opened, and a second inlet 10b is closed. And, a pump 14 begins to operate to feed water stored in a cistern 5 through a portion of an additional heating pipe 6 to a bath tub. A timer circuit T begins to count time simultaneously with switch-on. In case the limit time elapses before the water level reaches the specified one, the timer circuit T is reset, and a control circuit 17 is brought into operation to change over the hot water supply circuit to the circulation circuit and to stop burning in a hot water supply apparatus 1.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a method of controlling a water heater that fills a bathtub with hot water.

(b) Conventional technology JP-A-62-108957 discloses that a temperature sensor and a water level sensor are installed in the piping connected to the bathtub, and when the bathtub is filled with hot water, the temperature detected by the temperature sensor and the bathtub detected by the water level sensor are An automatic hot water bath device has been disclosed that automatically controls hot water supply and reheating based on the water level and automatically supplies hot water up to a set water level.

(c) Problems to be Solved by the Invention In the above conventional technology, when the bathtub is filled with hot water, for example, if the user forgets to close the drain or the drain is not closed securely. However, there was a problem in that the hot water supplied to the bathtub flowed out of the drain, and the hot water did not accumulate in the bathtub, resulting in the hot water being wasted.

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for controlling a hot water supply device that can significantly reduce the amount of hot water that is wasted when filling a bathtub with hot water, and that can reliably fill the bathtub with hot water. shall be.

(d) Means for Solving the Problems In order to solve the above problems, the present invention provides a hot water supply circuit (2) that supplies hot water to the bathtub (7), a water supply circuit (2) that detects the water level of the bathtub (7), and a hot water supply circuit that detects the water level of the bathtub (7). A water level detector (16) that outputs a signal when the water level reaches a set water level is provided, and when the bathtub (7) is filled with hot water, hot water is supplied to the bathtub (7) via the hot water supply circuit (2). , in a method of controlling a water heater that stops supplying hot water to a bathtub (7) based on a signal from a water level detector (16) when the water level of the bathtub (7) reaches a set water level,
To provide a method for controlling a hot water supply device that stops supplying hot water to a bathtub (7) regardless of the water level in the bathtub (7) when a predetermined time has elapsed from the start of hot water supply to the bathtub (7).

Also, a hot water supply circuit (2) that supplies hot water to the bathtub (7), a circulation circuit (6) that heats hot water in the bathtub (7), and a hot water supply circuit (2) that supplies hot water to the bathtub (7);
A water level detector (16) that detects the water level of control of a water heater that supplies hot water to the bathtub (7) via the water heater and stops supplying hot water to the bathtub (7) based on a signal from the water level detector (16) when the water level of the bathtub (7) reaches a set water level. In the method, when a predetermined period of time has elapsed from the start of hot water supply to the bathtub (7),
The flow of hot water is switched from the hot water supply circuit (2) to the circulation circuit (6), and when hot water from the bathtub (7) flows into the circulation circuit (6), the flow of hot water is switched from the circulation circuit (6) to the hot water supply circuit (2). The present invention provides a method for controlling a hot water supply apparatus that switches the hot water supply to the bathtub (7), restarts the hot water supply, and stops the hot water supply to the bathtub (7) when hot water does not flow through the circulation circuit (6).

Furthermore, there is provided a method for controlling a water heater that stops supplying hot water to a bathtub (7) regardless of the water level in the bathtub (7) when hot water flows through the circulation circuit (6) and a predetermined period of time has elapsed since hot water supply was resumed. It is something to do.

(*) Even if the water level in the bathtub (7) has not reached the set water level after a predetermined period of time has passed since hot water supply to the bathtub (7) has started, the hot water supply to the bathtub (7) will be stopped. , bathtub (7)
Even if the water level in the bathtub (7) does not reach the set water level due to forgetting to plug the bathtub (7), it is possible to prevent a large amount of hot water supplied to the bathtub (7) from being wasted.

Furthermore, when a predetermined period of time has elapsed since the start of hot water supply to the bathtub (7) and the flow of hot water is switched from the hot water supply circuit (2), the circulation circuit (
When hot water flows from the bathtub (7) in step 6), the flow of hot water is switched from the circulation circuit (6) to the hot water supply circuit (2) and hot water supply is resumed. It also becomes possible to reliably supply hot water. Also, when hot water does not flow into the circulation circuit (6), the water level detector (1)
Since hot water supply to the bathtub (7) is stopped even if no signal is output from the bathtub (7), it is possible to prevent a large amount of hot water supplied to the bathtub (7) from being wasted.

Furthermore, the flow of hot water is from the hot water supply circuit (2) to the circulation circuit (6).
), hot water flows through the circulation circuit (6), and when a predetermined period of time has elapsed since hot water supply was restarted, the hot water flows into the bathtub (7).
) The hot water supply to the bathtub (7) will stop even if the water level in the bathtub (7) has not reached the set water level, so even if the stopper of the bathtub (7) is incomplete, a large amount of hot water will be supplied to the bathtub (7). This makes it possible to prevent waste from being wasted.

(F) Example Hereinafter, an example of the present invention will be described in detail based on the drawings.

In Fig. 1, (1) is a water heater, (2) is a hot water supply pipe (hot water supply circuit), (3) is a hot water heat exchanger installed in the middle of the hot water supply pipe (2), and (4) is a hot water supply heat exchanger installed in the middle of the hot water supply pipe (2). > is burna, <5)
(S) is a temperature detector which temporarily stores hot water whose temperature has been increased in the hot water heat exchanger (3). (7) is a bathtub with a drain port (7A) on the bottom, and (6) is a bathtub with a drain port (7A) on the bottom.
) is the reheating pipe (circulation circuit) connected to the reheating pipe (6), and there is a reheating heat exchanger (8) in the middle of the reheating pipe (6).
) are connected. Further, (9) is a burner that heats the heat exchanger (8). Then, the heat exchanger (8) and the bathtub (
A three-way switching valve (switching device) (10) is provided in the middle of the return pipe (26) between the
A hot water supply pipe (2) is connected to. Also, in the middle of the outgoing pipe (13) between the heat exchanger (8) and the bathtub (7), there is a bomb 14) and a running water switch (running water detector) (15).
) is provided. Furthermore, a water level detector (16) is connected to the bathtub (7).

Figure 2 is a block diagram of the control device for the water heater;
In the figure, the same parts as in FIG. 1 are given the same reference numerals, and detailed explanations are omitted. (17) is a control circuit for the water heater, and this control circuit (17) is provided with a timer circuit (T). Further, (18) is a remote control provided in a bathtub etc., and (20> is a temperature setting section provided in this remote control (18). Also, (21), (22) and (2)
3) are a hot water filling switch, a water level setting section, and a reheating switch provided on the remote control (18), respectively.

The operation of the water heater will be described below.

To fill the bathtub (7) with hot water, the user sets the hot water temperature and water level using the temperature setting section (20) and water level setting section (22), and turns on the hot water filling switch (21). The circuit 17) operates. Then, the control circuit (1
The burner (4) starts combustion based on the signal from 7), and water flows into the hot water supply piping 2〉, and this water is heated in the hot water supply heat exchanger (3〉). Switching valve (1
The first inlet (10a) of 0) opens and the second inlet (10b) opens.
) closes. Also, the pump (14) starts operating and the temperature rises in the hot water heat exchanger (3), and the hot water stored in the distiller (5) passes through the three-way switching valve (10) and follows the direction shown by the solid arrow. It flows into the bathtub via the negative part of the fire piping (6). At this time, the control circuit (17) operates based on the signal from the temperature detector (S) installed in the hot water supply pipe (2) and the signal from the temperature setting section (20), and the combustion is controlled based on a signal from the control circuit (17), and the temperature of the hot water supplied to the bathtub (7) is maintained at approximately the set temperature.Also, at the same time as the hot water filling switch (21) is turned on, the control circuit ( The timer circuit (T) of 17) starts counting.

Time has passed since hot water filling started, and the timer circuit (
Before T) counts up, that is, the hot water filling time limit (
For example, if the water level detector (16) detects that the water level in the bathtub (7) has reached the set water level before 35 minutes (for example, 35 minutes) have elapsed, the control circuit (17) is activated and the pump (14) is activated. When the operation is stopped, combustion in the burner (4) is also stopped.

Further, if the hot water filling time limit elapses after the water filling starts and before the water level of the bathtub (7) reaches the set water level, the timer circuit (T) is reset and the control circuit (17) works. Then, the three-way switching valve (10) operates based on the signal from the control circuit (17), closes the first inlet (10a) and opens the second inlet (10b), switching from the hot water supply circuit to the circulation circuit. will be held. Further, combustion in the water heater (1) is stopped based on a signal from the control circuit (17). On the other hand, the pump (14) continues to operate.

Here, the user forgot to close the drain port (7A) with the stopper (7a), and the hot water supplied to the bathtub (7) leaked from the drain port (7A).
A), and the water level in the bathtub (7) is rising to the return pipe (2).
If the hot water does not reach the suction port (26A) of 6), hot water will not circulate through the reheating pipe (6) regardless of the operation of the pump (14). Therefore, the running water switch (15) is off, and the control circuit (17) operates based on the signal from the running water switch (15), and the pump (14) and burner (
4), the pump (14) stops operating,
Burner (4) stops combustion.

Also, if the drain port (7A) of the bathtub (7) is not closed securely, or if the set water level of the bathtub (7) is high, for example, the capacity of the set water level is 2001. Hot water filling capacity is 542/lll1n
Therefore, if it takes approximately 40 minutes to fill the bathtub with hot water,
) When the hot water filling time limit has elapsed before the water level reaches the set water level, the three-way switching valve (10) is switched and the burner (4) is stopped in the same way as described above. When the water level of the bathtub (7) is above the suction port (8A) as shown by the dashed line (28) in FIG. 1, the reheating pipe (6) is operated by the pump (14). ) hot water circulates. Therefore, the running water switch (15) is turned on, the control circuit (17) operates based on the signal from the running water switch (15), and outputs a signal to the three-way switching valve (10). The first inlet (10a) of 10) opens, and the second
The inlet (10b) is closed.

Further, the timer circuit (T) of the control circuit (17) starts counting, and the burner (4) starts combustion.

Then, the hot water is supplied to the hot water supply pipe (2) and the reheating pipe (
6) is again supplied to the bathtub (7).

After that, when time passes and the set water level of the bathtub (7) is high, and the water level of the bathtub (7) reaches the set water level before the hot water filling time limit elapses, the water level detector (16) A control circuit (17) operates based on a signal from. Then, the pump (14) stops operating and the water heater (1) stops burning.

Also, for example, if the drain port (7A) is not closed securely, there is a lot of hot water leaking from the drain port (7A), and the water filling time limit has elapsed before the water level in the bathtub (77) reaches the set water level. , ``The control circuit (17) operates based on the signal from the timer circuit (T). Then, the combustion of the burner (4) is stopped, and the operation of the pump (14) is also stopped.

Thereafter, when the user turns on the reheating switch (23) of the remote control (18) because the temperature of the hot water in the bathtub (7) has decreased over time, the control circuit (17) is activated. Then, as the pump (14) starts operating, the burner (9) starts combustion, the hot water in the bathtub (7) circulates as shown by the broken line arrow in Figure 1, and the reheating operation is performed. be exposed.

According to the embodiment of the present invention, when the bathtub (7) is filled with hot water, if the drain port (7A) of the bathtub (7) is not closed with the stopper (7a), the hot water is poured into the bathtub (7). The time limit for filling the bathtub with hot water elapses before the water level in the bathtub (7) reaches the set water level, and the timer circuit ('I') operates. Then, when the three-way switching valve (10) is switched by a signal from the control circuit (17), hot water does not flow into the reheating pipe (6), so the water flow switch (15) does not detect water flow and control Since the circuit (17) operates and stops supplying hot water to the bathtub (7), it is possible to prevent a large amount of hot water supplied to the bathtub (7) from being wasted.

In addition, when the hot water filling time limit has elapsed from the start of hot water filling, if the water flow switch (15) detects that hot water is flowing into the reheating pipe (6), it will stop supplying hot water to the bathtub (7). Even if the set water level of the bathtub (7) is high and the time required for filling with hot water is longer than the water filling time limit, hot water can be supplied to the bathtub (7) up to the set water level.

Furthermore, for example, the drain port (7A) of the bathtub (7) is connected to the stopper (7a).
) is not securely closed, hot water is leaking from the drain (7A), and when the hot water filling time limit has elapsed from the start of hot water filling and the three-way switching valve (10) is switched, the water level in the bathtub (7) is higher than the suction port (8A), the water switch (15) detects the flow of hot water, the control circuit (17) operates, and the hot water filling operation is restarted again, when the hot water filling time limit has elapsed. If the water level in the bathtub (7) has not reached the set water level, the control circuit (17) is activated and the hot water filling operation is forcibly stopped.
If there is a leak of hot water from the bathtub (7
), the hot water supply to the bathtub (7) can be stopped.
It determines whether the hot water filling time will be longer due to a high water level setting or when the water level in the bathtub (7) will be delayed due to a leak of hot water, and if there is a leak of hot water, hot water will be automatically supplied. This prevents a large amount of hot water supplied to the bathtub (7) from being wasted.

(G) Effects of the Invention The present invention is a method for controlling a hot water supply device configured as described above, in which the hot water filling operation is automatically stopped when a predetermined period of time has elapsed from the start of hot water filling when filling a bathtub with hot water. For,
To prevent a large amount of hot water supplied to a bathtub from being wasted due to forgetting to plug the bathtub stopper, etc.

Also, for example, if the set water level of the bathtub is high and it takes a long time to fill the hot water, and the flow of hot water is switched from the hot water supply circuit to the circulation circuit, and hot water flows into the circulation circuit, the hot water filling operation will start again and the setting will change. You can fill it with hot water up to the water level.

Furthermore, since the hot water filling operation is stopped when hot water does not flow through the circulation circuit, it is possible to prevent a large amount of hot water from being wasted due to forgetting to plug in the bathtub or the like.

Furthermore, if a predetermined amount of time has passed since hot water filling started, the hot water supply circuit is switched to the circulation circuit, and then the water level in the bathtub does not reach the set water level even after a predetermined amount of time has passed since hot water filling started. Since the hot water filling operation is automatically stopped, it is possible to prevent a large amount of hot water supplied to the bathtub from being wasted due to hot water filling continuing for a long time due to hot water leaking from the bathtub.

[Brief explanation of the drawing]

1 to 3 show an embodiment of the present invention, in which FIG. 1 is a schematic block diagram of a water heater, FIG. 2 is a schematic block diagram of a control device for the water heater, and FIG. is a flowchart for explaining the operation of the control device of the hot water supply device. (2)...Hot water supply circuit (hot water supply piping), (3)...
Heat exchanger, (6)...circulation circuit (reheating piping),
(7)...Bathtub, (10)...Switching device (three-way switching valve), (15)...Flowing water detector (flowing water switch)
, (16)...Water level detector, (T)...Timer device (timer circuit).

Claims (1)

[Scope of Claims] 1. A hot water supply circuit that supplies hot water to a bathtub, and a water level detector that detects the water level of the bathtub and outputs a signal when the water level of the bathtub reaches a set water level, and fills the bathtub with hot water. In a method for controlling a water heater that supplies hot water to a bathtub via a hot water supply circuit and stops supplying hot water to the bathtub based on a signal from a water level detector when the water level in the bathtub reaches a set water level, A method of controlling a hot water supply device, characterized in that hot water supply to a bathtub is stopped when a predetermined time has elapsed from the start of hot water supply, regardless of the water level in the bathtub. 2. The bathtub is equipped with a hot water supply circuit that supplies hot water to the bathtub, a circulation circuit that heats the hot water in the bathtub, and a water level detector that detects the water level in the bathtub and outputs a signal when the water level in the bathtub reaches a set water level. In a control method for a water heater, which supplies hot water to a bathtub via a hot water supply circuit when filling with hot water to the bathtub, and stops supplying hot water to the bathtub based on a signal from a water level detector when the water level in the bathtub reaches a set water level. When a predetermined period of time has elapsed since the start of hot water supply to the bathtub, the flow of hot water is switched from the hot water supply circuit to the circulation circuit, and when hot water from the bathtub flows into the circulation circuit, the flow of hot water is switched from the circulation circuit to the hot water supply circuit, and hot water supply is resumed. A method of controlling a hot water supply apparatus, characterized in that the hot water supply to the bathtub is stopped when hot water does not flow through the circulation circuit. 3. The hot water supply device according to claim 2, characterized in that hot water flows through the circulation circuit and hot water supply to the bathtub is stopped when a predetermined period of time has elapsed after hot water supply is resumed, regardless of the water level in the bathtub. Control method.