JPH0621710B2 - Hot water supply device and hot water supply heat retention device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention is to connect a return hot water pipe to a hot water supply pipe from the hot water heater to the hot water tap near the hot water tap, and circulate the hot water to the hot water bottle by the return hot water pipe. The present invention relates to a hot water supply apparatus and a hot water supply heat retention apparatus for keeping hot water in a hot water supply pipe when water is stopped by supplying water so that hot water having a desired temperature can be supplied from a hot water tap even at the initial stage of hot water supply.

More specifically, a water supply pipe for supplying water from a water supply source to a heat exchanger for heating water, a first water amount detection sensor for detecting the amount of water supplied to the heat exchanger by the water supply pipe, and the heat A burner for heating the exchanger, a first controller for making the burner in a combustion state only when the amount of water detected by the first water amount detection sensor is equal to or more than a set amount of water, and hot water for supplying hot water from the heat exchanger to a hot water tap. A return hot water provided with a water heater equipped with a pipe and connected to the water supply pipe and a portion of the hot water supply pipe near the hot water tap to form a circulation passage for circulating water supply from the hot water supply pipe to the water supply pipe. A pipe is provided, a pump is provided in the return hot water pipe, an electric heater for heating the circulating water circulating in the circulation passage is provided, and a temperature detection sensor for detecting the temperature of the circulating water circulating in the circulation passage is provided, Based on the information of the temperature detection sensor Hot water supply apparatus provided with a second controller for automatically switching the electric heater in the heating operation state heating and stopped state, and to thermal insulation apparatus for useful hot water to form such a water heater.

[Conventional technology]

Conventionally, as shown in FIG. 3, a pump for the return hot water pipe (31)
(P ') is formed as a constant speed rotary type, and a water amount detection sensor (S ₄ ) for the first controller (C ₃ ) that operates the burner (1) of the water heater (B)
Is arranged upstream of the connection between the water supply pipe (32) and the inner return hot water pipe (31), and the pump (P ′) is constantly rotated at a constant speed.
The burner (1) is controlled by the controller (C ₃ ) and the second controller (C ₄ )
Therefore, the electric heater (H) is automatically switched between the heating operation state and the heating stop state as described below.

(A) At start-up Although the pump (P ') is in the operating state, the hot water tap (6) is closed and the flow rate detected by the water amount detection sensor (S ₄ ) is
The burner (1) is maintained in a digested state by the first controller (C ₃ ) because the amount of water is less than the set amount of water set to prevent overheating of the heat exchanger. On the other hand, since the temperature detected by the temperature detection sensor (S ₅ ) is less than the set temperature, the electric heater (H) is brought into the heating operation state by the second controller (C ₄ ) and circulated by the pump (P ′). Water is heated by an electric heater (H).
Then, when the temperature detected by the temperature detection sensor (S ₅ ) exceeds the set temperature, the electric heater (H) is turned on by the second controller (C ₄ ).
Is in a heating stopped state.

(B) When keeping warm The electric heater (H) is automatically switched between the heating operation state and the heating stop state by the second controller (C ₄ ) based on the information from the temperature detection sensor (S ₅ ), and the pump (P ′ The temperature of the water circulated by) is maintained at the set temperature.

(C) Hot water supply When the hot water tap (6) is opened and water is supplied from the water supply pipe (32) to the water heater (B), the flow rate detected by the water amount detection sensor (S ₄ ) exceeds the set water amount. the first controller by (C ₃₎ burner (1) is in the combustion state, the hot water of a predetermined temperature is supplied to the water heater (B) from hot water plug (6). At this time, hot water having a predetermined temperature maintained by the electric heater (H) is supplied even in the initial stage of hot water supply.

[Problems to be Solved by the Invention]

However, since the pump (P ') is constantly rotating at a constant speed, the pump is designed to speed up the temperature rise of the circulating water at startup.
Increasing the amount of water supplied to (P ') unnecessarily increases the power consumption by the pump (P') during heat retention, and the heat exchanger dissipates heat when the burner (1) is consumed, which is contrary to the heating action. Since it works, the amount of heat released due to the water circulation increases, the power consumption by the electric heater (H) increases, and the operating cost becomes expensive and the operating cost is wasted.

An object of the first invention is to make it possible to speed up the temperature rise of circulating water at the time of start-up, and to reduce power consumption during operation and waste.

An object of the second invention is to easily and inexpensively remodel an existing hot water supply facility having no heat insulation means into a heat insulation function excellent in startup performance and operating cost according to the first invention. The point is to provide a heat retaining device for hot water supply, which can carry out remodeling work and is effective in reducing the selling price of the hot water supply device.

[Means for Solving the Problems]

The characteristic configuration of the first invention is that the first water amount detection sensor for the first controller, which makes the burner in a combustion state only when the amount of water supplied to the water heater is equal to or more than the set water amount, is The second water amount detection sensor is provided on the downstream side of the connection portion with the hot water pipe and upstream of the connection portion, and the pump of the return hot water pipe is at a large flow rate state equal to or more than the set water amount and Provided is a water supply amount changing means for switching between a small flow rate state less than a set water amount and a stopped state, and an operation section for switching the electric heater between a heating operation state and a heating stopped state, and an electric power supply pipe line from the water heater to the hot water tap. In a second controller for the heater, first determining means for determining that the second water amount detection sensor has detected a water amount equal to or greater than the set water amount, and the second water amount detection sensor detects a water amount less than the set water amount. And the above Second determination means for determining that the temperature detection sensor has detected a temperature not lower than the set temperature on the high temperature side and not lower than the set temperature on the low temperature side, and the second water amount detection sensor detects a water amount less than the set water amount and detects the temperature. A third determination means for determining that the sensor has detected a temperature lower than the low temperature side set temperature is provided, and the second controller is configured to detect that the second water amount detection sensor has detected a water amount equal to or greater than the set water amount. When the first determination means makes a determination, the water amount changing means is instructed to the stop state, the operation unit is instructed to the heating stop state, and the second water amount detection sensor is less than the set water amount. The second condition is that the amount of water is detected and the temperature detection sensor detects a temperature that is lower than or equal to the high temperature-side set temperature and higher than or equal to the low temperature-side set temperature.
When the determination means makes a determination, it instructs the water flow rate change means to the small flow rate state, instructs the operation section to the heating operation state, and instructs the water flow rate conversion means to the small flow rate state. And in the state of instructing the heating operation state to the operation unit, when the temperature detection sensor detects a temperature of the high temperature side set temperature or more, while instructing the water flow rate changing unit to the small flow rate state, Instructing the operation unit to stop the heating,
And when the third determination means determines that the second water amount detection sensor detects a water amount less than the set water amount and the temperature detection sensor detects a temperature less than the low temperature side set temperature, the water supply amount Instructing the changing means of the large flow rate state,
In addition, when the water flow rate conversion unit is instructed to the large flow rate state, the operation unit is instructed to be in the heating stopped state, and the operation is as follows.

[Work]

 That is, the hot water supply device operates as follows.

(B) At startup Since the tap is closed, the amount of water detected by the second water amount detection sensor becomes less than the set water amount, and the temperature detected by the temperature detection sensor becomes less than the low temperature side set temperature. Therefore, since the third determination means determines that the second water amount detection sensor has detected the water amount less than the set water amount and the temperature detection sensor has detected the temperature less than the low temperature side set temperature, the second control means changes the water supply amount. Instructing the means of large flow rate,
The pump operates at high flow rate. Therefore, the amount of water detected by the first water amount detection sensor becomes equal to or higher than the set flow rate by the water circulation by the pump, the burner is put into a combustion state by the first controller, and the circulating water is heated by the water heater.

In the state in which the water flow rate changing means is instructed to the large flow rate state, the second control means instructs the operation section to stop heating, so that the electric heater is in a heating stop state.

When the second determination means determines that the second water amount detection sensor detects a water amount less than the set water amount and the temperature detection sensor detects a temperature not higher than the high temperature side set temperature and not lower than the low temperature side set temperature, the second control is performed. The means instructs the water flow rate changing means to indicate the small flow rate state and also instructs the operation section to indicate the heating operation state. Therefore, the pump is switched to the small flow rate state and the electric heater is in the heating operation state. That is, the amount of circulating water by the pump becomes less than the set amount of water, the burner is extinguished by the first controller, and the circulating water is heated by the electric heater instead of the water heater.

Further, when the temperature detection sensor detects a temperature equal to or higher than the set temperature on the high temperature side by the heating by the electric heater, the second control unit instructs the operation unit to stop the heating, so that the electric heater is stopped.

(B) When keeping warm The electric heater second controller automatically switches between the heating operation state and the heating stop state by the information from the temperature detection sensor, and the water circulated by the pump is kept warm.

(C) Hot water supply When the tap is opened, water is supplied from the water supply line to the water heater,
The amount of water detected by the first and second water amount detection sensors is equal to or greater than the set amount of water. Therefore, the burner is put into a combustion state by the first controller. Further, since the first determination means determines that the second water amount detection sensor has detected the water amount which is equal to or more than the set water amount, the second controller instructs the water supply amount changing means to the stop state and the heating stop state to the operation part. Therefore, the pump is stopped and the electric heater is stopped heating. At this time, the hot water kept warm by the electric heater is supplied at the initial stage of hot water supply.

The low temperature side set temperature is appropriately set as the lowest temperature in the allowable temperature range of the hot water when hot water is supplied from the hot water tap at the initial stage of hot water supply, and the high temperature side set temperature is appropriately set as the highest temperature in the allowable temperature range.

In short, at the start-up, the pump is set to a large flow rate and heated by the water heater, so that the temperature of the circulating water can be raised quickly, and at the same time, the pump can be set to a small flow rate state to reduce the power consumption of the pump. The amount of heat released due to water circulation can be reduced, and the electricity consumption by the electric heater for heat retention can be reduced.

Further, since the electric heater is stopped when the burner is in a combustion state at the time of rising and during hot water supply, and the pump is stopped during hot water supply, the power consumption can be further reduced.

Further, since the burner of the water heater is ignited and extinguished by the first water amount detection sensor and the first controller by changing the flow rate of the pump, a control system for the water heater and a control system for the pump and the electric heater are independently formed. In addition, it is easy to form the heat insulation part in a unit different from the water heater, and it is advantageous in terms of cost and construction to remodel the existing hot water supply equipment that does not have heat insulation means to one that has a heat insulation function. Convenient in providing the unit.

[Means for Solving the Problems]

A characteristic configuration of the second invention is that the water heater has a water supply pipe to a heat exchanger for heating water, a first water amount detection sensor for detecting a water supply amount to the heat exchanger by the water supply pipe, A burner for heating the heat exchanger, a first controller for making the burner in a combustion state only when the amount of water detected by the first water amount detection sensor is equal to or more than a set amount of water, and a hot water supply pipe from the heat exchanger, To the water supply pipe, the second pipe connection to the water supply pipe of the water heater, the third pipe connection to the return hot water pipe near the tap, the fourth pipe to the water supply pipe of the water heater Connection part, a fifth pipe connection part for the hot water supply pipe to the hot water tap, a second water amount detection sensor provided in the hot water supply pipe line from the first pipe connection part to the second pipe connection part, and the first pipe connection part Only flow from the side to the second pipe connection side Check valve, a pump provided in a return hot water pipe from the third pipe connecting portion to the second pipe connecting portion, a temperature detecting sensor, and the third pipe connecting portion side to the second pipe connecting portion side. A check valve that allows only flow, an electric heater provided in the hot water supply pipe line from the fourth pipe connection portion to the fifth pipe connection portion, a large flow state in which the pump is equal to or more than the set water amount and less than the set water amount Based on the information from the water flow rate changing means for switching between the small flow rate state and the stop state, the operation section for switching the electric heater between the heating operation state and the heating stop state, and the second water amount detection sensor and the temperature detection sensor, A unit is provided with a second controller for instructing the large flow rate state, the small flow rate state or the stopped state to the water supply amount changing means, and for instructing the heating operation state or the heating stopped state to the operation unit, The second A first determining means for determining in the controller that the second water amount detection sensor has detected a water amount greater than or equal to the set water amount; and a second water amount detection sensor for detecting a water amount less than the set water amount and detecting the temperature. Second determining means for determining that the sensor has detected a temperature not lower than the high temperature set temperature and not lower than the low temperature set temperature, and the second water amount detection sensor detects a water amount less than the set water amount and the temperature detection sensor is A third determination unit that determines that a temperature lower than the low temperature side set temperature is detected is provided, and the second controller is configured to detect that the second water amount detection sensor detects a water amount equal to or more than the set water amount. When the determination means determines, the water amount changing means is instructed to the stop state, the operation unit is instructed to the heating stop state, and the second water amount detection sensor is the set water. Wherein that amount of water detected and the temperature detection sensor of less than detects a low temperature side set temperature or higher in the following high temperature side set temperature second
When the determination means makes a determination, it instructs the water flow rate change means to the small flow rate state, instructs the operation section to the heating operation state, and instructs the water flow rate change means to the small flow rate state. And in the state of instructing the heating operation state to the operation unit, when the temperature detection sensor detects a temperature of the high temperature side set temperature or more, while instructing the water flow rate changing unit to the small flow rate state, Instructing the operation unit to stop the heating,
And when the third determination means determines that the second water amount detection sensor detects a water amount less than the set water amount and the temperature detection sensor detects a temperature less than the low temperature side set temperature, the water supply amount Instructing the changing means of the large flow rate state,
In addition, when the water flow rate changing unit is instructing the large flow rate state, the operation unit is instructed to the heating stop state, and the operation is as follows.

[Work]

That is, when modifying the existing hot water supply equipment without the heat retention means, the existing hot water heater can be used as it is, and the hot water supply equipment having the heat insulation function can be obtained by the work of the following (a) to (d).

(A) A water supply source is connected to the first pipe connection part, and a water supply pipe of an existing water heater separated from the water supply source is connected to the second pipe connection part.

(B) Extend the return hot water pipe connected to the hot water supply pipe near the existing hot water tap to near the hot water insulation device.

(C) Connect the return pipe to the third pipe connection.

(D) Separate the existing hot water supply pipe, connect the hot water supply pipe on the water heater side to the fourth pipe connection, and connect the hot water supply pipe on the hot water tap side to the fifth pipe connection.

When the hot water supply warming device is attached to the existing hot water supply equipment as described above, it operates as described in detail in the section of [Operation] of the first aspect of the present invention to exert the warming function and to improve the startup performance and the power consumption. Sufficient savings can be achieved.

In short, the existing hot-water supply equipment that does not have the heat-retaining means can be easily and inexpensively modified by using the existing water heater as it is.

Also, on the manufacturer side, it is sufficient to manufacture many kinds of water heaters that do not have a heat retaining function and one or several kinds of heat retaining devices for hot water supply. It is possible to reduce the total cost of manufacturing, and the selling price of the water heater can be sufficiently reduced.

〔The invention's effect〕

As a result, not only can hot water of a desired temperature be supplied even in the initial stage of tapping, but the temperature rise of the circulating water at startup is fast, and
It has become possible to provide a high-performance hot-water supply heat insulation device with higher performance and less consumption of expensive electric power and waste.

In addition, it is possible to provide a useful and novel hot water supply heat retaining device which is advantageous in terms of cost and construction in modifying the existing hot water supply device to such an excellent hot water supply device and which is effective in reducing the price of the hot water supply device. It became so.

〔Example〕

 Next, examples will be shown.

As shown in Fig. 1, the instantaneous combustion type water heater (B) has a water supply pipe (4) for a heat exchanger for heating water and a water supply pipe (4) for connecting the heat exchanger to the heat exchanger. A first water amount detection sensor (S ₁ ) for detecting the water supply amount, and a burner (1) for heating the heat exchanger.
And the combustion valve (V ₃ ) of the burner (1) is opened only when the amount of water detected by the first water amount detection sensor (S ₁ ) is equal to or more than the set amount of water, and the burner (1) is burned by the spark plug (24). 1 controller (C ₁ ) and a hot water supply pipe (13) from the heat exchanger.

The hot water supply warming device (A) that is connected to the water supply source (2), the water heater (B) and the hot water tap (6) has the following components (a) to (n). It is prepared as a unit.

(A) First piping connection (3) to the water supply source (2) such as water supply (b) Second piping connection to the water supply pipe (4) of the water heater (B)
(5) (C) Third for the return hot water pipe (7) from near the tap (6)
Piping connection (8) (d) 4th piping connection (1) to the hot water supply pipe (13) of the water heater (B)
4) (e) Fifth piping connection to hot water supply pipe (15) to tap (6)
(16) (f) A second water amount detection sensor (S) provided upstream of the connection part of the return hot water pipe among the water supply pipes from the first pipe connection part (3) to the second pipe connection part (5). ₂ ) and a check valve (V ₁ ) (g) that allows only flow from the first pipe connection (3) side to the second pipe connection (5) side. 2 Return to the piping connection (5) From the pump (P) and temperature detection sensor (S ₃ ) provided in the hot water pipe to the third piping connection (8) side to the second piping connection (5) side Check valve (V ₂ ) (h) that allows only flow of water (h) The water flow rate changing means that switches the pump (P) to a large flow rate state above the set water volume, a small flow rate state below the set water volume, and a stopped state (9) (I) Electric heater provided in the buffer tank (17) provided in the hot water supply pipe line from the fourth pipe connection part (14) to the fifth pipe connection part (16)
(H) and its electric heater (H) to switch between heating operation state and heating stop state (10) (d) Second guess detection sensor (S ₂ ) and temperature detection sensor (S)
Based on the information from ₃ ), the water flow rate changing means (9) is instructed of the large flow rate state, the small flow rate state or the stop state,
In addition, in the second controller (C ₂ ) and the second controller (C ₂ ) for instructing the operation unit (10) to the heating operation state or the heating stop state, as shown in FIG.
Or a third determining means is provided.

(a) First determination means (19) for determining that the second water amount detection sensor (S ₂ ) has detected a water amount greater than or equal to the set water amount (b) The second water amount detection sensor (S ₂ ) is less than the set water amount Second determination means (20) (c) for determining that the temperature detection sensor (S ₂ ) has detected a temperature equal to or lower than the high temperature-side set temperature and equal to or higher than the low temperature-side set temperature (S ₂₎ ) Detects the amount of water less than the set amount of water, and the temperature detection sensor (S ₃ ) determines that the temperature of the low temperature side is less than the set temperature. Third determination means (21) Further, the second controller (S ₂ ) Is configured as follows as shown in FIG.

(a) When the first judging means (19) judges that the second water quantity detecting sensor (S ₂ ) has detected the water quantity equal to or more than the set water quantity, the water quantity changing means (9) is instructed to stop and A command for instructing the operation unit (10) to stop heating is sent to the output circuit (18a). (B) The second water amount detection sensor (S ₂ ) detects a water amount less than the set water amount and the temperature detection sensor ( When the second determination means (20) determines that S ₃ ) has detected a temperature higher than the low temperature side set temperature and higher than the low temperature side set temperature, the water flow rate change means (9) is instructed of the small flow rate state and A command for instructing the heating operation state to the operation unit (10) is transmitted to the output circuit (18b).

(c) Temperature detection while sending a command to the output circuit (18b) to instruct the water flow rate changing means (9) to stop the small flow rate and to instruct the operating section (10) to perform the heating operation. Sensor (S ₃ )
When the temperature detected is higher than the set temperature on the high temperature side, the flow rate change means (9) is instructed to the small flow rate state and the operation part (1
(0) indicates the heating stop state. (D) The second water amount detection sensor (S ₂ ) has detected a water amount less than the set water amount and the temperature detection sensor (S ₃ ) has detected a temperature lower than the low temperature side set temperature. When the third determining means (21) determines that the water supply amount changing means (9) issues a command to the output circuit (18c) to instruct the water supply amount changing means (e). When a command to instruct the output circuit (18c) to instruct the
Instructing the heating stop state in (10) In short, for the hot water supply to the water heater (B), the operation is performed as described in the paragraphs (a) to (c) of the column of "action" for the first invention. It is constructed so that a heat insulation function can be added by assembling the heat insulation device (A).

[Another embodiment]

 Next, another embodiment will be described.

In the hot water supply device according to the first aspect of the present invention, the water heater (B) and the hot water supply heat retention device (A) may be formed as an integrated unit.

The hot water supply device or the hot water supply heat retention device (A) may be a wall-mounted type or a stationary type.

The first and second water amount detection sensors (S ₁ ) and (S ₂ ) can be selected from well-known appropriate ones such as a water flow switch, and the temperature detection sensor (S ₃ ) can also be selected from well-known appropriate ones such as a thermistor. it can.

In order to form the water flow rate changing means (9) of the pump (P),
Configure so that the number of revolutions of (P) can be changed, or that the number of operating multiple pumps (P) arranged in parallel is changed.

The hardware and software of the first and second controllers (C ₁ ) and (C ₂ ) can be changed appropriately. For example, the difference between the high temperature set temperature and the low temperature set temperature can be freely selected.

The specific configuration of the target water heater (B) does not matter. For example, the fuel may be city gas, natural gas, propane, heavy oil, kerosene, or the like.

The taps (6) are not limited in the number of installations, hot water supply targets, and the like.

It should be noted that reference numerals are added to the claims for convenience of comparison with the drawings.

BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1 and 2 show an embodiment of the present invention, FIG. 1 is a conceptual diagram of a hot water supply apparatus, and FIG. 2 is a block diagram illustrating a control system. FIG. 3 is a conceptual diagram of a conventional example. (1) …… Burner, (2) …… Water supply source, (3) …… First piping connection, (4) …… Water supply pipe, (5) …… Second piping connection, (6) …… Hot water tap, (7) …… Return hot water pipe, (8) …… Third pipe connection part, (9) …… Water supply amount changing means, (10) …… Operation part, (13) …… Hot water pipe, ( 14) …… 4th pipe connection part, (15) …… hot water supply pipe, (16) …… fifth pipe connection part, (19) …… first judgment means, (20) …… second judgment means, ( 21) ...... third judging means, (B) ...... water heaters, (C ₁₎ ...... first controller, (C ₂₎ ...... second controller, (H) ...... electric heater, (P ) …… Pump, (S ₁ ) …… First water amount detection sensor, (S ₂ ) …… Second water amount detection sensor, (S ₃ ) …… Temperature detection sensor, (V ₁ ), (V ₂ ) …… Check valve.

Claims (2)

[Claims] 1. A water supply conduit for supplying water from a water supply source (2) to a heat exchanger for heating water, and a first water amount detection sensor for detecting the amount of water supplied to the heat exchanger by the water supply conduit. (S ₁ ) and
A burner (1) for heating the heat exchanger, and a first controller (C ₁ ) for putting the burner (1) into a combustion state only when the amount of water detected by the first water amount detection sensor (S ₁ ) is equal to or more than a set amount of water.
And a water heater (B) equipped with hot water pipes (13), (15) for supplying hot water from the heat exchanger to the hot water tap (6), and the water supply pipe line and the hot water pipe (15) A return hot water pipe (7) is provided which forms a circulation path for circulating water from the hot water supply pipe (15) to the hot water supply pipe, which is connected to the portion close to the hot water tap (6) of A pump (P) is provided in the passage (7), an electric heater (H) for heating the circulating water circulating in the circulating passage is provided, and a temperature detection sensor (S ₃ for detecting the temperature of the circulating water circulating in the circulating passage is provided. ) Is provided, and a second controller (C ₂ ) that automatically switches the electric heater (H) between a heating operation state and a heating stop state based on information from the temperature detection sensor (S ₃ ) is provided. Therefore, the first water amount detection sensor (S ₁ ) is arranged on the downstream side of the connection part with the return hot water pipe (7) in the water supply pipe, and the second water amount detection sensor (S ₁ ) is arranged on the upstream side. ₂ ) The pump (P) is provided with a water supply amount changing means (9) for switching the pump (P) to a large flow state above the set water amount, a small flow state below the set water amount and a stopped state, and a heating operation state and heating stop of the electric heater. An operating unit (10) for switching to a state is provided, and the second controller (C ₂ ) is configured to determine that the second water amount detection sensor (S ₂ ) has detected a water amount equal to or greater than the set water amount. (19), the second water amount detection sensor (S ₂ ) detects a water amount less than the set water amount, and the temperature detection sensor (S ₃ ) detects a temperature higher than the high temperature side set temperature and higher than the low temperature side set temperature. The second determination means (20) for determining that the second water amount detection sensor (S ₂ ) detects a water amount less than the set water amount and the temperature detection sensor (S ₃ ) is less than the low temperature side set temperature. Third judging means for judging that the temperature is detected
(21) is provided, and the first controller (19) determines that the second controller (C ₂ ) detects that the second water amount detection sensor (S ₂ ) detects a water amount equal to or more than the set water amount. At this time, the water supply amount changing means (9) is instructed to the stop state, the operation unit (10) is instructed to the heating stop state, and the second water amount detection sensor (S ₂ ) is When the second determination means (20) determines that the temperature detection sensor (S ₃ ) has detected a water amount less than the set water amount and the temperature detection sensor (S ₃ ) has detected a temperature above the low temperature side set temperature and above, The water flow rate changing means (9) is instructed to the small flow rate state, the operation section (10) is instructed to the heating operation state, and the water flow rate changing means (9) is instructed to the small flow rate state. And the temperature detection sensor (S ₃ ) is set to the high temperature side while instructing the heating operation state to the operation unit (10). When a temperature equal to or higher than the temperature is detected, the water flow rate changing means (9) is instructed to the small flow rate state, the operation section (10) is instructed to the heating stop state, and the second water volume detection is performed. The third determination means (21) indicates that the sensor (S ₂ ) has detected a water amount less than the set water amount and the temperature detection sensor (S ₃ ) has detected a temperature less than the low temperature side set temperature.
When it is determined that the water flow rate changing means (9) is instructing the large flow rate state and the water flow rate changing means (9) is instructing the large flow rate state, the operation unit ( 10) A hot water supply device configured to instruct the heating stop state. 2. A water heater (B) detects a water supply pipe (4) to a heat exchanger for heating water and a water supply amount to the heat exchanger by the water supply pipe (4). The detection sensor (S ₁ ), the burner (1) that heats the heat exchanger, and the burner (1) is put into a combustion state only when the water amount detected by the first water amount detection sensor (S ₁ ) is equal to or more than the set water amount. A first controller (C ₁ ) and a hot water supply pipe (13) from the heat exchanger, a first pipe connecting part (3) to a water supply source (2), the water heater
The second pipe connection (5) to the water supply pipe (4) in (B), the third pipe connection (8) to the return hot water pipe (7) near the tap (6), the water heater ( B) a fourth pipe connection portion (14) to the hot water supply pipe (13), a fifth pipe connection portion (16) to the hot water supply pipe (15) to the hot water tap (6), and a first pipe connection portion (3) ) From the second pipe connection part (5) to the second water amount detection sensor (S ₂ ) provided in the water supply pipe and the first pipe connection part (3) side to the second pipe connection part (5) side Check valve (V
₁ ), the third pipe connecting part (8) to the second pipe connecting part
Return to (5) Pump (P), temperature detection sensor (S ₃ ) provided in the hot water pipe and flow from the side of the third pipe connection (8) to the side of the second pipe connection (5) Non-return valve (V ₂ ) that allows only the above, an electric heater (H) provided in the hot water supply pipe line from the fourth pipe connection portion (14) to the fifth pipe connection portion (16), and the pump (P) A water flow rate changing means (9) for switching a large flow rate state above the set water volume to a small flow rate state below the set water volume and a stop state, and an operation section for switching the electric heater (H) between a heating operation state and a heating stop state ( 10), and based on the information from the second water amount detection sensor (S ₂ ) and the temperature detection sensor (S ₃ ), the water flow rate changing means (9) is set to the large flow state, the small flow state or the indicates the stopped state, and, equipped with a second controller to instruct the heating operation state or the heating stop state to the operating unit (10) and (C ₂₎ to the unit, the The second controller (C _2), and the second water amount detection sensor (S ₂₎ is first determining means for determining the detection of the more water the setting water (19), the second water amount detection sensor (S ₂ ) a second judging means (20) for judging that the water amount less than the set water amount is detected and the temperature detection sensor (S ₃ ) has detected a temperature not lower than the high temperature side set temperature and not lower than the low temperature side set temperature. Third determination means for determining that the second water amount detection sensor (S ₂ ) detects a water amount less than the set water amount and the temperature detection sensor (S ₃ ) detects a temperature less than the low temperature side set temperature
(21) is provided, and the first controller (19) determines that the second controller (C ₂ ) detects that the second water amount detection sensor (S ₂ ) detects a water amount equal to or more than the set water amount. At this time, the water supply amount changing means (9) is instructed to the stop state, the operation unit (10) is instructed to the heating stop state, and the second water amount detection sensor (S ₂ ) is When the second determination means (20) determines that the temperature detection sensor (S ₃ ) has detected a water amount less than the set water amount and the temperature detection sensor (S ₃ ) has detected a temperature above the low temperature side set temperature and above, The water flow rate changing means (9) is instructed to the small flow rate state, the operation section (10) is instructed to the heating operation state, and the water flow rate changing means (9) is instructed to the small flow rate state. And the temperature detection sensor (S ₃ ) is set to the high temperature side while instructing the heating operation state to the operation unit (10). When a temperature equal to or higher than the temperature is detected, the water flow rate changing means (9) is instructed to the small flow rate state, the operation section (10) is instructed to the heating stop state, and the second water volume detection is performed. The third determination means (21) indicates that the sensor (S ₂ ) has detected a water amount less than the set water amount and the temperature detection sensor (S ₃ ) has detected a temperature less than the low temperature side set temperature.
When it is determined that the water flow rate changing means (9) is instructing the large flow rate state and the water flow rate changing means (9) is instructing the large flow rate state, the operation unit ( A hot water warming device configured to instruct 10) the heating stopped state.