JPH11141983A - Water heater and water heating composite apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water heater having an excellent functionality and for shortening a delay until a supply of hot water desired by a user is stably continued as short as possible by rapidly starting a combustion of a gas burner without inconvenience such as an excess ignition sound or the like of the burner after starting water flow of a hot water supply tube. SOLUTION: A negative pressure eliminating valve opening operation for opening a hot water supply solenoid valve 17 or 18 of a downstream side of a governor proportional solenoid valve 16 for a predetermined time to obviate a negative pressure generated at a position between a main solenoid valve 15 of a gas supply tube 6 and the valve 16 during stopping of water flow of a hot water supply tube 4 is periodically executed at a predetermined time interval. When the water flow of the tube 4 is started, combustion of a gas burner 5 is immediately started in response to it. At the time of starting the water flow during the negative pressure eliminating valve opening operation, a process of negative pressure eliminating valve opening operation is interrupted, and the combustion of the gas burner 5 is immediately started while the valve 17 or 18 remains open as it is.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot water supply apparatus and a combined hot water supply apparatus.

[0002]

2. Description of the Related Art In a hot water supply device or a hot water supply combined device including the hot water supply device as a part of a system (for example, a system in which a hot water supply device is combined with a bath reheating device, a heating device, or the like), a user is required to use the system. When a hot water supply pipe such as a kitchen or a bathroom is opened to start flowing water through a hot water supply pipe, it is detected by a flow sensor such as a flow rate sensor or a water flow switch, and the heat provided in the middle of the hot water supply pipe in response to the detection. It is generally known that a heating means such as a gas burner for heating an exchanger is operated to heat water flowing through a hot water supply pipe to supply hot water.

In this type of hot water supply apparatus (including a hot water supply apparatus of a combined hot water supply apparatus), the hot water desired by the user is discharged to the curan side as quickly as possible after the water supply of the hot water supply pipe is started. Is desired.

For this reason, in recent years, even during the stoppage of water supply to the hot water supply pipe (while the hot water supply operation is stopped), the heating means is appropriately operated to keep the temperature of the water in the hot water supply pipe in the heat exchanger.
It is known that hot water desired by a user is discharged as quickly as possible when the user starts water supply through a hot water supply pipe (for example, see Japanese Patent Application Laid-Open No. 9-24316).

On the other hand, in a hot water supply apparatus using a gas burner as the heating means, a gas supply pipe for supplying a fuel gas to the gas burner is provided with a first gas supply pipe in order from the upstream side.
An opening / closing solenoid valve (base valve), a governor proportional solenoid valve and a second opening / closing solenoid valve (hot water supply solenoid valve) are interposed. The first and second opening / closing solenoid valves supply and shut off fuel gas to the gas burner. It is customary to control the combustion operation of the gas burner by adjusting the amount of fuel gas supplied to the gas burner by the governor proportional solenoid valve.

In the hot water supply combined device, fuel gas is supplied to a gas burner (hereinafter, referred to as a gas burner for another device) related to a combustion device such as a bath reheating device and a heating device other than the hot water supply device. Gas supply pipe is branched from the gas supply pipe between the first opening / closing solenoid valve and the governor proportional solenoid valve (hereinafter, this branched gas supply pipe is referred to as
In this case, the gas supply pipe for another device) is provided with a governor proportional solenoid valve and a third on-off solenoid valve for controlling the combustion operation of the gas burner for another device in this order from the upstream side. It is generally equipped.

In the hot water supply apparatus provided with the governor proportional solenoid valve in the gas supply pipe as described above, the water supply of the hot water supply pipe of the hot water supply apparatus in which the combustion operation of the gas burner is stopped is stopped. Is the fuel present at the inlet side (primary side) of the governor proportional solenoid valve by the diaphragm (which is made of resin material such as rubber) built in the governor proportional solenoid valve during the combustion operation of all gas burners is stopped. The gas is gradually absorbed over time, and as a result, a negative pressure is generated in the gas supply pipe between the governor proportional solenoid valve and the first opening / closing solenoid valve (base valve), and the valve body of the governor proportional solenoid valve is It is known that a state where the valve is largely operated toward the valve opening side is obtained.

In such a state, the first and second opening / closing solenoid valves are operated to the valve-opening side according to the flow of water through the hot water supply pipe of the hot water supply device to supply fuel to the gas burner of the hot water supply device. When the gas burner is started to start the combustion operation, excessive fuel gas is supplied at the start of the combustion of the gas burner, which may cause a loud ignition sound.

For this reason, in this type of hot water supply apparatus, when the flow of water through the hot water supply pipe is started, the opening / closing operation of the second opening / closing solenoid valve on the downstream side (secondary side) of the governor proportional solenoid valve (second opening / closing solenoid valve). By opening the gas passage in the governor proportional solenoid valve to the atmosphere for a predetermined time (for example, about 1.5 seconds) through the second on-off solenoid valve and the gas burner. To eliminate the negative pressure. And
After the negative pressure state is eliminated by performing the opening / closing operation of the second opening / closing solenoid valve in this manner, the first opening / closing solenoid valve and the second opening / closing solenoid valve are operated to the valve opening side to supply the fuel to the gas burner of the water heater. Is started, and the combustion operation of the gas burner is started.

After the second opening / closing solenoid valve is opened for a predetermined time in order to eliminate the negative pressure, the first opening / closing solenoid valve is operated to the opening side while the second opening / closing solenoid valve is kept open. In some cases, the combustion operation of a gas burner is started.

[0011] Further, since the above-mentioned negative pressure does not occur rapidly after the combustion of the gas burner is stopped in response to the stop of the flow of water through the hot water supply pipe, the negative pressure is not generated within a predetermined time (for example, 8 hours) after the stop of the combustion. When the water supply of the hot water supply pipe is resumed within (minutes), combustion of the gas burner is restarted without performing the opening / closing operation of the second opening / closing solenoid valve as described above. When the flow of water is resumed, the second open / close solenoid valve is opened for a predetermined time to eliminate the negative pressure state, and then the combustion of the gas burner is started.

However, as described above, before the gas burner of the hot water supply apparatus starts burning, the operation of opening the second opening / closing solenoid valve for a predetermined time to eliminate the negative pressure is performed. Until the combustion of the gas burner starts, a delay occurs by adding the time required for the opening and closing operation of the solenoid valve and the predetermined time, and as a result, water flowing through the hot water supply pipe without being heated or water that is underheated is not heated. When the amount of water has increased and the water supply of the hot water supply pipe has started, a delay is likely to occur before the tapping of hot water desired by the user is continuously performed.

[0013] Incidentally, in the case where the gas burner is appropriately burned while the water supply of the hot water supply pipe is stopped to keep the temperature of the water in the hot water supply pipe in the heat exchanger, heat exchange is started immediately after the water supply of the hot water supply pipe is started. Although the hot water kept warm at the place of the vessel comes out,
Thereafter, during the above-mentioned opening and closing operation of the second opening and closing solenoid valve, the water that has entered the hot water supply pipe at the location of the heat exchanger is discharged in a non-heated state or under-heated state, so that the tapping of the hot water desired by the user is performed. There will be a delay until the operation is performed stably and continuously.

[0014]

SUMMARY OF THE INVENTION In view of the above background, the present invention provides a method for quickly starting combustion of a gas burner without inconvenience such as an excessive ignition sound of a gas burner after starting water supply through a hot water supply pipe. It is an object of the present invention to provide a hot water supply apparatus and a hot water supply combined apparatus which can minimize a delay until hot water is stably and continuously supplied and which has excellent functionality.

[0015]

To achieve the above object, a water heater according to the present invention has a gas burner for heating water flowing through a hot water supply pipe via a heat exchanger, and a gas supply for supplying fuel gas to the gas burner. A first opening / closing solenoid valve, a governor proportional solenoid valve, and a second opening / closing solenoid valve, which are interposed in order from the upstream side of the pipe, and a fuel gas to the gas burner by opening each of the solenoid valves while water flows through the hot water supply pipe. In the hot water supply device, comprising: an operation control means for performing the combustion of the gas burner while supplying the water, the operation control means comprises: Means are provided for periodically performing a negative pressure releasing valve opening operation of opening the second on-off solenoid valve for a predetermined time at a predetermined time interval in order to release a negative pressure generated at a location between the proportional solenoid valve and the valve. With, at least When the start timing of the water flow of the hot water supply pipe is different from the timing of the negative pressure eliminating valve opening operation, characterized in that immediately allowed to initiate combustion of the gas burner according to the start of water passage of the fed-water pipe.

According to the hot water supply apparatus of the present invention, while the water supply through the hot water supply pipe is stopped, the second open / close electromagnetic valve downstream of the governor proportional electromagnetic valve is opened by the operation control means for a predetermined time. Negative pressure is generated in the gas supply pipe between the governor proportional solenoid valve and the first opening / closing solenoid valve on the upstream side by periodically performing the negative pressure releasing valve opening operation at predetermined time intervals. (The negative pressure is caused by the absorption of fuel gas by the diaphragm of the governor proportional solenoid valve.) Further, in this case, by appropriately setting the predetermined time interval for performing the negative pressure releasing valve opening operation, after the water supply of the hot water supply pipe is stopped, the negative pressure release of the second opening / closing solenoid valve is first performed. The negative pressure is large until the valve opening operation is performed or between the time when the negative pressure releasing valve opening operation is performed at some point during the water stoppage and the next time the negative pressure releasing valve opening operation is performed. It doesn't matter. In other words, by performing the negative pressure release valve opening operation periodically at a predetermined time interval during the stoppage of the water supply of the hot water supply pipe (while the combustion of the gas burner is stopped), even if the negative pressure is generated, The negative pressure is always canceled when the pressure is sufficiently small, and at any time during the stoppage of the water supply of the hot water supply pipe (while the combustion of the gas burner is stopped), the connection between the governor proportional solenoid valve and the first opening / closing solenoid valve is stopped. The negative pressure as described above does not occur excessively between them. Therefore, in the present invention, combustion of the gas burner is started immediately in response to the start of water supply of the hot water supply pipe at least when the start timing of water supply through the hot water supply pipe is different from the timing of the negative pressure release valve opening operation. That is, according to the present invention, as described above, an excessive negative pressure does not occur between the governor proportional solenoid valve and the first opening / closing solenoid valve during the stoppage of water supply through the hot water supply pipe, so that the water supply through the hot water supply pipe does not occur. Start timing is different from the timing of the negative pressure releasing valve opening operation (in this case, the second opening / closing solenoid valve is closed at the time of starting water supply), the first time immediately after the start of water supply through the hot water supply pipe, the first. Even if the opening / closing solenoid valve, the second opening / closing solenoid valve and the governor proportional solenoid valve are opened to start combustion of the gas burner while supplying fuel gas to the gas burner, excessive fuel gas is not supplied to the gas burner. Also, no loud ignition sound of the gas burner is generated. Then, by immediately starting the combustion of the gas burner in response to the start of water supply through the hot water supply pipe, heating of the water flowing through the hot water supply pipe is started almost at the same time as the start of water supply. Hot water supply is performed promptly after water supply starts.

Therefore, according to the hot water supply apparatus of the present invention, after starting the water supply through the hot water supply pipe, the combustion of the gas burner is started immediately without causing inconvenience such as an excessive ignition sound of the gas burner.
It is possible to minimize the delay until the tapping of hot water desired by the user is performed as much as possible, and it is possible to provide a hot water supply device having excellent functionality.

In the hot water supply apparatus of the present invention, each time the operation of the gas burner changes from the combustion state to the fire extinguishing state, the operation control means defines the timing of performing the negative pressure relieving valve opening operation based on the fire extinguishing time. Start timing at a predetermined time interval. That is, during the combustion of the gas burner,
Since the fuel gas flows through the gas supply pipe, no negative pressure is generated in the gas pipe between the governor proportional solenoid valve and the first opening / closing solenoid valve. Therefore, every time the gas burner changes from the combustion state to the fire extinguishing state, by starting timing of the predetermined time interval that defines the timing of performing the negative pressure releasing valve opening operation based on the fire extinguishing time, the hot water supply pipe is started. The cancellation of the negative pressure during the stoppage of the flow of water can be performed at an optimum timing.

Further, in the hot water supply apparatus of the present invention, the start timing of the flow of water through the hot water supply pipe happens to be during the negative pressure eliminating valve opening operation. Since such a situation is stochastically small, after performing the negative pressure elimination valve opening operation completely,
That is, after the second opening / closing solenoid valve is opened for the predetermined time, each of the solenoid valves may be opened to start the combustion of the gas burner, but preferably, the operation control means includes the hot water supply When the start timing of water supply through the pipe is during the negative pressure release valve opening operation, the process of the negative pressure release valve opening operation is immediately interrupted in response to the start of water supply through the hot water supply pipe,
The combustion of the gas burner is started while the second on-off solenoid valve is kept open.

In this way, even if the start timing of water supply through the hot water supply pipe happens to be during the negative pressure relief valve opening operation, combustion of the gas burner is immediately started in response to the start of water supply through the hot water supply pipe. It is possible to reduce the delay from the start of the operation until the tapping of hot water desired by the user is performed.
Therefore, in combination with the case where the start timing of water supply and the timing of the negative pressure elimination valve opening operation are different, when the water supply of the hot water supply pipe is started at any time, the combustion of the gas burner is immediately started. This can effectively reduce the delay until the hot water desired by the user is supplied. Further, as described above, since the negative pressure is not excessively generated at the time of the negative pressure releasing valve opening operation, the negative pressure releasing valve opening operation is interrupted and the combustion of the gas burner is started as described above. However, no loud ignition sound of the gas burner is produced by the negative pressure.

In the hot water supply apparatus of the present invention as described above, the operation control means includes the gas burner for keeping the temperature of the water in the hot water supply pipe in the heat exchanger at a predetermined temperature while the flow of water through the hot water supply pipe is stopped. It is particularly preferable to provide a means for intermittently performing the combustion of the gas, and to perform the negative pressure elimination valve-opening operation in a state in which the combustion of the gas burner is stopped while the flow of water through the hot water supply pipe is stopped.

That is, by keeping the water in the hot water supply pipe in the heat exchanger by appropriately burning the gas burner while the hot water supply pipe is stopped, the water is kept at an early stage after the start of the water supply. The hot water that has been discharged flows out, and the gas burner starts burning almost at the same time as the flow of water.Therefore, after the hot water that has been kept warm at the heat exchanger, it is newly placed in the hot water supply pipe at the heat exchanger. The incoming water is quickly heated and discharged in the process of flowing through the hot water supply pipe of the heat exchanger. Therefore, after the continuous and stable supply of hot water desired by the user is started, hot water can be discharged very quickly. In this case, even when the water is stopped, when the gas burner is burned, the negative pressure does not occur during the combustion. Perform in a stopped state.

Next, in order to achieve the above object, the combined hot water supply apparatus of the present invention has a first gas burner for heating water flowing through a hot water supply pipe via a heat exchanger, and a hot water supply apparatus having a first gas burner. A combustion device having a second gas burner for heating an object to be heated other than water, and a first opening / closing solenoid valve which is interposed in order from an upstream side of a gas supply pipe for supplying a fuel gas to the first gas burner A water supply governor proportional solenoid valve and a second opening / closing solenoid valve, and a branch from the gas supply pipe between the first opening / closing solenoid valve and the hot water supply governor proportional solenoid valve to supply fuel gas to the second gas burner. A gas supply pipe for another device, a governor proportional solenoid valve and a third opening / closing solenoid valve for another device which are sequentially interposed from the upstream side of the gas supply pipe for another device, and passing water through the hot water pipe of the water heater. The first opening / closing solenoid valve, hot water supply governor With the proportional solenoid valve and the second on-off solenoid valve opened, fuel gas is supplied to the first gas burner and combustion of the first gas burner is performed. A hot water supply combined apparatus comprising: an operation governor for opening a governor proportional solenoid valve for equipment and a third opening / closing solenoid valve to perform combustion of the second gas burner while supplying fuel gas to the second gas burner. The control unit is configured to control the first opening / closing solenoid valve of the gas supply pipe, the governor proportional solenoid valve for hot water supply, and the other while the water supply of the hot water supply pipe of the hot water supply device is stopped and the operation of the combustion device is stopped. In order to eliminate the negative pressure generated between the governor proportional solenoid valves for the device, a negative pressure canceling opening operation of opening at least one of the second on-off solenoid valve and the third on-off solenoid valve for a predetermined time is required. Means for periodically performing water supply at a time interval of at least, and at least when the start timing of water supply through the hot water supply pipe is different from the timing of the negative pressure elimination valve opening operation, The combustion of the first gas burner is started immediately.

According to the combined hot water supply apparatus of the present invention, when the water supply of the hot water supply pipe of the hot water supply apparatus is stopped and the operation of the combustion device is stopped, the second on-off solenoid valve and the third open / close valve are connected.
By periodically performing a negative pressure releasing valve opening operation of opening at least one of the opening and closing solenoid valves for a predetermined time at predetermined time intervals, the first opening and closing valve, the governor proportional solenoid valve for hot water supply and another Even if a negative pressure is generated in the gas supply pipe between the governor proportional solenoid valve for equipment and the gas supply pipe (the negative pressure is caused by the absorption of fuel gas by the diaphragm of the governor proportional solenoid valve for hot water supply or the governor proportional solenoid valve for another equipment). Occurs), which is eliminated. That is, in the hot water supply combined device of the present invention, the location between the first opening / closing valve and the governor proportional solenoid valve for hot water supply and the location between the first opening / closing valve and the governor proportional solenoid valve for another device are different from those for the other device. Since they are in communication with each other via the gas supply pipe, the negative pressure elimination valve opening operation of at least one of the second opening / closing solenoid valve on the water heater side and the third opening / closing solenoid valve on the combustion device side is predetermined. The negative pressure is eliminated by periodically performing the above-mentioned time intervals. In addition, similarly to the above-described hot water supply device, by appropriately setting the predetermined time interval for performing the negative pressure releasing valve opening operation, the negative pressure releasing valve opening operation is not performed when the negative pressure releasing valve opening operation is not performed. The pressure does not become excessively large, and therefore, the negative pressure does not become excessively large at any time while the water supply of the hot water supply pipe is stopped and the operation of the combustion equipment is stopped. And since the negative pressure does not become excessive in this way, when the start timing of the water supply of the hot water supply pipe is different from the timing of the negative pressure elimination valve opening operation, the water supply of the hot water supply pipe is performed. Even if the combustion of the first gas burner is started immediately upon the start, no loud ignition sound is generated at the time of the combustion. Then, in response to the passage of water through the hot water supply pipe, the first
By starting the combustion of the gas burner, the heating of the water flowing through the hot water supply pipe of the hot water supply device is started almost simultaneously with the start of water supply, and the tapping of hot water desired by the user is quickly performed after the start of water supply. .

Therefore, according to the hot water supply combined system of the present invention, after the water supply of the hot water supply pipe is started, the combustion of the gas burner is started immediately without causing inconvenience such as an excessive ignition sound of the gas burner, and the hot water desired by the user is discharged. A delay until hot water is supplied can be reduced as much as possible, and a hot water supply combined device having excellent functionality can be provided.

In this combined hot water supply apparatus of the present invention, the operation control means changes the state in which one of the first and second gas burners is burning from the state in which both the first and second gas burners are extinguished. Every time, the timing of the predetermined time interval that defines the timing for performing the negative pressure releasing valve opening operation is started. That is, when any one of the first and second gas burners is burning, the negative pressure does not occur. Therefore, each time the first and second gas burners are extinguished from the state in which one of the first and second gas burners is burning, the timing for performing the negative pressure releasing valve opening operation is defined. By starting the time measurement at the predetermined time interval, the negative pressure can be eliminated at an optimal timing while the water supply of the hot water supply pipe is stopped and the operation of the combustion equipment is stopped.

In the combined hot water supply apparatus according to the present invention, the opening / closing solenoid valve for performing the negative pressure elimination valve opening operation is the third opening / closing solenoid valve, and the operation control means includes: When the start timing of the water is the halfway timing of the negative pressure releasing valve opening operation, the processing of the negative pressure releasing valve opening operation is immediately interrupted in response to the start of the flow of the hot water supply pipe, and the third
It is preferable to start the combustion of the first gas burner while closing the on-off electromagnetic valve.

In this way, even in a situation where the start timing of water supply through the hot water supply pipe happens to be halfway through the negative pressure relief valve opening operation, the start of water supply through the hot water supply pipe is immediately performed. It is possible to reduce the delay from the start of combustion of the first gas burner of the hot water supply device to the start of hot water discharge desired by the user. In this case, as described above, since the excessive negative pressure does not occur during the negative pressure releasing valve opening operation, the second opening / closing solenoid valve or the like is opened immediately upon the start of water supply through the hot water supply pipe. Even if the supply of the fuel gas to the first gas burner is started in a state, no excessive fuel gas is supplied to the first gas burner. Therefore, the combustion start of the first gas burner can be smoothly performed without generating a loud ignition sound. Furthermore, by closing the third on-off solenoid valve in parallel with the combustion start operation of the first gas burner, the supply of the fuel gas to the second gas burner of the combustion equipment can be interrupted without any trouble. Further, when the combustion device is a device that is used less frequently than a hot water supply device such as, for example, a bath reheating device, the third device that controls supply of fuel gas to a second gas burner of the combustion device is used. By performing the negative pressure relieving valve opening operation by the on-off solenoid valve, the life of the hot water supply combined device can be extended.

The opening / closing solenoid valve for performing the negative pressure elimination valve opening operation is a second opening / closing electromagnetic valve on the side of the hot water supply device, and the start timing of water supply to the hot water supply pipe of the hot water supply device is determined by the start timing of the negative pressure elimination valve opening operation. During the process, as in the case of the above-described hot water supply apparatus of the present invention, the operation of releasing the negative pressure of the second opening / closing solenoid valve is interrupted, and while the second opening / closing solenoid valve is kept open, the hot water supply pipe is closed. You may make it start combustion of a 1st gas burner immediately according to water flow.

In the hot water supply combined device of the present invention as described above,
As in the case of the above-described hot water supply apparatus of the present invention, the operation control means is configured to maintain the temperature of the water in the hot water supply pipe in the heat exchanger at a predetermined temperature while stopping the flow of water through the hot water supply pipe. Means for intermittently performing combustion of a gas burner, wherein the negative pressure release valve is opened when combustion of the first gas burner is stopped while water supply to a hot water supply pipe of the water heater is stopped and operation of the combustion device is stopped. The operation is performed.

As a result, as with the above-described hot water supply apparatus of the present invention, the hot water desired by the user can be supplied very quickly after the start of continuous and stable tap water supply. Note that, in this case, the negative pressure releasing valve opening operation is, of course, performed in a state where the combustion of the first gas burner is stopped while the flow of water through the hot water supply pipe of the water heater is stopped and the operation of the combustion device is stopped. .

[0032]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, an embodiment of a combined hot water supply apparatus according to the present invention will be described with reference to FIGS. FIG. 1 is an overall system configuration diagram of a combined hot water supply apparatus of the present embodiment, FIG.
FIG. 3 is a sectional view of the governor proportional solenoid valve provided in the apparatus of FIG.
FIG. 4 is a block diagram of a control system of the apparatus of FIG. 1, and FIG.
6 is a flowchart for explaining the operation of the device of FIG.

Referring to FIG. 1, a combined hot water supply apparatus according to the present embodiment includes a hot water supply apparatus 1 for supplying hot water to a kitchen, a bathroom, and the like, and a bath reheating apparatus, for example, a combustion apparatus for boiling hot water in bathtub A. Device 2.

The hot water supply apparatus 1 includes a hot water supply pipe 4 provided through a heat exchanger 3 provided in the main body 1a, and a main body for heating water flowing through the hot water supply pipe 4 through the heat exchanger 3. Part 1
Hot water supply gas burner 5 housed in a (first gas burner)
A gas supply pipe 6 for supplying fuel gas to the hot water supply gas burner 5 and a heat exchanger for mixing a part of water flowing toward the heat exchanger 3 with the hot water flowing out of the heat exchanger 3. And a bypass pipe 7 branched from the hot water supply pipe 4 upstream of the hot water supply pipe 3 and joined to the hot water supply pipe 4 downstream of the heat exchanger 3.

An upstream end of the hot water supply pipe 4 is connected to a water pipe (not shown), and a downstream end of the hot water supply pipe 4 is provided with a curan 8 provided in a kitchen or a bathroom.
(Hot-water tap). And in hot water supply pipe 4,
On the upstream side of the branch point with the bypass pipe 7 (on the upstream side of the heat exchanger 3), a water flow sensor 9 for detecting whether or not water flows through the hot water supply pipe 4 and the amount of water flow, and a flow of water through the hot water supply pipe 4 And a water supply temperature sensor 11 for detecting a supply water temperature (a temperature of water flowing into the heat exchanger 3 and the bypass pipe 7). At the downstream side (downstream side of the heat exchanger 3) of the junction point of (1), the temperature of the hot water flowing to the Karan 8 side (the temperature of the hot water formed by joining the water flowing out of the heat exchanger 3 with the water flowing through the bypass pipe 7) is detected. The hot water temperature sensor 12 for performing the operation is provided.

Further, the hot water supply pipe 4 has a heat exchange temperature for detecting the temperature of the hot water flowing out of the heat exchanger 3 near the outlet of the heat exchanger 3 on the upstream side of the junction with the bypass pipe 7. A sensor 13 is provided.
A bypass servo valve 14 for adjusting the amount of water flowing therethrough is provided.

The gas supply pipe 6 is provided in order from the upstream side.
An original electromagnetic valve 15 as a first opening / closing electromagnetic valve, a governor proportional electromagnetic valve 16 for hot water supply, and a pair of hot water supply electromagnetic valves 17 and 18 as a second opening / closing electromagnetic valve are provided.

In this case, in this embodiment, the hot water supply gas burner 5 is constituted by two burner groups 20 and 21 each including a plurality of burners 19. The gas supply pipe 6 is provided downstream of the governor proportional solenoid valve 16 with a sub pipe 22 for supplying fuel gas to the burner group 20.
And a sub pipe 23 for supplying fuel gas to the burner group 21
And the hot water supply solenoid valves 17 and 18 are provided in the sub pipes 22 and 23, respectively.

In this embodiment, the hot water supply gas burners 5 are classified into two burner groups 20 and 21 and the hot water supply solenoid valves 17 and 18 are provided for each of the burner groups 20 and 21 in the present embodiment. Hot water supply solenoid valve 1
By opening only one of the burners 7 and 18, the burner group 2
0, 21 or both of the hot water supply solenoid valves 17, 18 are opened to burner groups 20, 21.
By burning both of them, the combustion capacity of the hot water supply gas burner 5 can be switched.

In addition to the heat exchanger 3 and the hot water gas burner 5, the hot water gas burner 5
Hot water supply fan 24 for supplying combustion air to
A flame rod 25 for detecting the presence / absence of combustion flame of the hot water gas burner 5 (detection of ignition / non-ignition) and an ignition plug 26 for igniting the hot water gas burner 5 are provided.

The bath reheating device 2 is connected to the bath A for circulating and heating the hot water in the bath A, and via a heat exchanger 27 provided in the main body 2a of the bath reheating device 2. A pipe 28, a bath gas burner 29 (second gas burner) housed in the main body 2a for heating hot water in a bathtub flowing through the pipe 28 through the heat exchanger 27, and a bath gas burner. 29 is provided with a gas supply pipe 30 (gas supply pipe for another device) for supplying a fuel gas.

The hot water in the bathtub A is supplied to the circulation
8, a water flow switch 32 for detecting the presence or absence of water flow in the circulation path 28, and a circulation path 2
A bath temperature sensor 33 for detecting the temperature of the hot water flowing in the bath 8 (the temperature of the hot water in the bathtub A) is provided.

A gas supply pipe 30 for supplying a fuel gas to the bath gas burner 29 is provided at a location between the main solenoid valve 15 and the hot water supply governor proportional solenoid valve 16 and is branched from the gas supply pipe 6. A bath governor proportional solenoid valve 34 and a bath solenoid valve 35 serving as a third opening / closing solenoid valve are interposed in order from the upstream side.

In addition to the heat exchanger 27 and the bath gas burner 29, a bath combustion fan 36 for supplying combustion air to the bath gas burner 29 and a bath gas burner 29 Flame rod 3 for detecting the presence / absence of a combustion flame (ignition / non-ignition)
7. An ignition plug 38 for igniting the bath gas burner 29 is provided.

In FIG. 1, reference numeral 39 denotes a high voltage applied to the spark plug 26 of the hot water supply device 1 and the spark plug 38 of the hot water reheating device 2 to apply the spark plugs 26, 38 It is an igniter for generating spark discharge.

Here, the structure of the hot water supply governor proportional solenoid valve 16 and the bath governor proportional solenoid valve 34 will be briefly described with reference to FIG. deep.

Referring to FIG. 2, the governor proportional solenoid valve 16 for hot water supply and the governor proportional solenoid valve 34 for bath are both of the same structure and have a known basic structure.
, A coil housing 42 attached to the open end (upper end) of the main case 41, and the main case 41 at the position of the open end of the main case 41. And a substantially annular diaphragm 43 interposed between the coil accommodating portion 42 and the coil accommodating portion 42. The diaphragm 43 is formed of an elastic resin material such as rubber.

The valve body 40 is vertically movable between a valve seat 44 provided on the inner peripheral portion of the main body case 41 and a projection 45 protruding from the bottom of the main body case 41. Thereby, the opening between the valve seat 44 and the valve seat 44 can be adjusted.

An inlet for allowing fuel gas to flow into a space formed in the main body case 41 between the valve body 40 and the diaphragm 43 above the valve body 40 is provided on a side portion near the opening end of the main body case 41. A side opening (primary side opening) 46 is formed,
Although not shown in the lower part of the main body case 41,
An outlet side opening (secondary side opening) for allowing fuel gas to flow out of a space formed in the main body case 41 below the valve body 40 is formed. In the hot water supply governor proportional solenoid valve 16, the inlet-side opening 46 and the outlet-side opening are located upstream (original solenoid valve 15) and downstream (the hot water supply) of the gas supply pipe 6 (see FIG. 1), respectively. Solenoid valves 17 and 18)
Similarly, in the bath governor proportional solenoid valve 34, the inlet-side opening 46 and the outlet-side opening are respectively located upstream (the original solenoid valve 1) of the gas supply pipe 30 (see FIG. 1).
5 side) and the downstream side (bath solenoid valve 35 side).

A shaft 47 extending upward from the valve 40 toward the open end of the main body case 41 is attached to the axis of the valve body 40. The upper portion of the shaft 47 is provided with a diaphragm. 43 through the central hole of the coil housing 4
2 protrudes into The inner peripheral edge of the diaphragm 43 is fixed to the shaft 47 via auxiliary members 48 and 49, and the outer peripheral edge of the diaphragm 43 is
1 and is fixed to the main body case 41 side via auxiliary members 50 and 51 between the coil accommodating portion 42.

The coil accommodating portion 42 has a plunger 52 disposed concentrically with the shaft 47 by contacting a lower end surface of the shaft 47 with a portion protruding above the diaphragm 43.
And a screw 5 screwed toward the plunger 52 at the upper end surface of the plunger 52 and the upper end of the coil accommodating portion 42.
3 and an electromagnetic coil 5 wound around the plunger 52.
, And the plunger 52 includes the electromagnetic coil 5.
5 when energized, the valve element 40 is lowered by the magnetic force of the electromagnetic coil 55 by an amount corresponding to the energized amount, and the valve body 40 is depressed.
Thereby, the valve element 40 is operated to the valve opening side at an opening degree corresponding to the amount of current supplied to the electromagnetic coil 55.

By adjusting the amount of compression of the spring 54 by the screw 53, the minimum opening of the valve body 40 is adjusted.
It is open to the atmosphere side (outside the coil accommodating portion 42) through a hole (not shown). In the figure, reference numeral 56 denotes a cancel spring for canceling the elastic force acting on the valve body 40 from the diaphragm 43 when the electromagnetic coil 55 is not energized.

The governor proportional solenoid valve 16 having the above structure
In the bath governor proportional solenoid valve 34, the amount of electricity supplied to the electromagnetic coil 55 is controlled during the combustion of the hot water supply gas burner 5 and the combustion of the bath gas burner 29, respectively. (Not shown)
The secondary pressure of the fuel gas flowing in the main body case 41 (pressure of the fuel gas on the downstream side of the valve body 40) is controlled toward the hot water supply gas burner 5 and the bath gas burner 29. The supply is controlled.

The governor proportional solenoid valve 16 having such a structure
In the bath governor proportional solenoid valve 34, the combustion of both the hot water supply gas burner 5 and the bath gas burner 29 is stopped (all of the original solenoid valve 15, the hot water supply solenoid valves 17, 18 and the bath solenoid valve 35 are closed). In this state, the fuel gas in the main body case 41 on the inlet side opening 46 side is gradually absorbed by the diaphragm 43, so that the governor proportional solenoid valve 16, the bath governor proportional solenoid valve 34, and the original solenoid valve 15 A negative pressure is gradually generated in the gas supply pipes 6 and 30 during the period. When the negative pressure increases, the diaphragm 43 bends toward the valve body 40, and the valve body 40 moves toward the valve opening side (the side where the degree of opening increases).

On the other hand, referring to FIG. 3, in the hot water supply combined system of the present embodiment, in addition to the above-described configuration, a controller 5 for controlling the operations of the hot water supply device 1 and the bath reheating device 2 is provided.
7 (operation control means), and a remote controller 58 for the user to instruct the controller 57 on desired operation of the hot water supply device 1 and the bath reheating device 2.

In this case, the remote controller 58 is provided with a main operation switch 59 for instructing the controller 57 to start and stop the entire hot water supply multifunction device, and the controller 57 performs a warming operation control of the hot water supply device 1 described later. The controller 57 controls the warming switch 60 for closing, the temperature setting switch 61 for instructing the controller 57 of the target hot water temperature of the hot water supply device 1, and the operation of boiling the hot water in the bathtub A by the bath reheating device 2. Operation switch 62 and the like are provided.

The controller 57 is constructed using a microcomputer, and its main functional configuration is a hot water supply side control means 63a for controlling the operation of the hot water supply apparatus 1,
Bath-side control means 63b for controlling the operation of bath reheating device 2
They are roughly divided into

The hot water supply side control means 63a includes a command given from the remote controller 58 and the water amount sensor 9, the water supply temperature sensor 11, and the tap water temperature sensor 1 provided in the water heater 1 as described above.
2. Based on the detection outputs of various sensors such as the heat exchange temperature sensor 13 and the frame rod 25, and based on the operation state of the bath reheating device 2 provided from the bath-side control means 63b, the original solenoid valve 15 and the governor for hot water supply are proportional. Solenoid valve 16, hot water supply solenoid valve 1
The required operation of the hot water supply apparatus 1 is performed by controlling the operations of the hot water supply fan 7, 7, the hot water supply combustion fan 24, the water quantity servo valve 10, the bypass servo valve 14, and the igniter 39.

Similarly, the bath-side control means 63b receives commands from the remote controller 58 and the water flow switch 32 and the bath temperature sensor 3 provided in the bath reheating device 2 as described above.
3. Based on the detection outputs of various sensors such as the frame rod 37, and the operation state of the hot water supply apparatus 1 provided from the hot water supply side control means 63a, the original solenoid valve 15, the bath governor proportional solenoid valve 34, the bath solenoid valve 35 By controlling the operation of the circulation pump 31, the bath combustion fan 36, and the igniter 39, the required operation of the bath reheating device 2 is performed.

Next, the operation of the hot water supply combined system of the present embodiment will be specifically described. First, the basic operation of the water heater 1 will be described with reference to FIGS.
For example, when the user opens the curan 8 and starts water supply through the hot water supply pipe 4 in a state where the main operation switch 59 is turned ON, the controller 57 detects this by the output of the water amount sensor 9, and At this time, the hot water supply side control means 63a of the controller 57 performs a process for igniting the hot water gas burner 5. This ignition process is performed by the hot water supply combustion fan 24.
With the main solenoid valve 15, the governor proportional solenoid valve 16 for hot water supply, and the hot water supply solenoid valves 17, 18 opened, the igniter 39 is operated while supplying combustion air and fuel gas to the hot water gas burner 5. This is done by causing a spark discharge in the spark plug 26.

Subsequently, the hot water supply side control means 63a of the controller 57 checks the ignition of the hot water gas burner 5 based on the output of the frame rod 25, and then detects the water amount sensor 9, the hot water temperature sensor 11, the hot water temperature sensor 12, and the heat exchange temperature. Sensor 13
In accordance with the detected output of the hot water supply, the combustion amount of the hot water gas burner 5 is controlled by controlling the hot water supply governor proportional solenoid valve 16 and the hot water supply combustion fan 24, and the combustion capacity of the hot water supply gas burner 5 is switched by opening and closing the hot water supply electromagnetic valves 17, 18; Water quantity servo valve 10
Adjustment of total water flow through hot water supply pipe 4 by bypass, bypass servo valve 1
4 adjusts the amount of water flowing through the bypass pipe 7 so that the outlet temperature detected by the outlet temperature sensor 12 can be adjusted by the remote controller 5.
The operation of the water heater 1 is controlled so as to match the target hot water temperature instructed by the temperature setting switch 61 of FIG.

When the flow of water through the hot water supply pipe 4 is stopped, the controller 57 detects this by the output of the water quantity sensor 9, and at this time, the hot water supply side control means 63 a
5. The energization of the governor proportional solenoid for hot water supply and the hot water supply solenoid valves 17 and 18 is stopped, and they are operated to the valve closing side (however,
While the bath gas burner 29 of the bath reheating device 2 is burning, the original solenoid valve 15 is kept in the open state), and the hot water supply combustion fan 24 is stopped to extinguish the hot water supply gas burner 5.

Further, when the heat retention switch 60 of the remote controller 58 is turned ON, the controller 5
7 is provided with the hot water supply device 1 as described above.
In addition to the operation control described above, a warming operation control as described below is performed.

That is, the heat keeping operation control is performed by the hot water supply pipe 4.
After the water supply is stopped, the hot water supply pipe 4
As soon as water flow is resumed, Kallang 8
In order to supply hot water at a target hot water temperature or a hot water temperature close to the target hot water, the hot water supply gas burner 5 is intermittently fired at an appropriate timing while the hot water supply pipe 4 is stopped from flowing. This is a control process for heating and keeping the water in the hot water supply pipe 4 of the exchanger 3. More specifically, the hot water supply side control means 63a of the controller 57 controls the hot water supply pipe 4 of the heat exchanger 3 according to the target hot water temperature, the temperature detected by the hot water temperature sensor 11 and the like while the hot water supply pipe 4 is stopped. The target warming temperature of the hot water in the hot water and the timing at which combustion of the hot water gas burner 5 is started (in this embodiment, the detected temperature of the heat exchange temperature sensor 13 corresponds to the target hot water temperature and the detected temperature of the hot water temperature sensor 11). A predetermined temperature (corresponding to a temperature lower than the target heat retention temperature) determined accordingly, and a time for continuing the combustion are determined, and the combustion of the hot water gas burner 5 (more specifically, the ignition and combustion of the hot water gas burner 5) is accordingly performed. , Fire extinguishing is repeated) so that the temperature of the hot water in the hot water supply pipe 4 of the heat exchanger 3 is kept in a range near the target heat retaining temperature. Further, in this case, when the flow of water through the hot water supply pipe 4 is resumed, the hot water supply pipe 4 of the heat exchanger 3 that has been kept warm as described above.
Since the hot water in the water merges with the water flowing through the bypass pipe 7 and flows out to the curan 8 side, the opening degree of the bypass servo valve 14 is adjusted so that the hot water temperature after the merging becomes the target hot water temperature. Keep it.

When the hot water supply gas burner 5 is burned as described above while the hot water supply pipe 4 is stopped, in order to prevent a rapid rise in the temperature of the hot water in the hot water supply pipe 4 of the heat exchanger 3. The hot water supply gas burner 5 burns with the minimum combustion amount (the opening degree of the hot water supply governor proportional solenoid valve 16 is the minimum opening degree at which the hot water supply gas burner 5 can burn). Further, the ignition process and the fire extinguishing process during the combustion operation of the hot water supply gas burner 5 during the stoppage of the water supply are performed in the same manner as the start and stop of the water supply described above.

By performing such heat keeping operation control while the water supply of the hot water supply pipe 4 is stopped, when the water supply of the hot water supply pipe 4 is restarted,
Before the water newly flowing into the hot water supply pipe 4 of the heat exchanger 3 passes through the heating and flows out to the curan 8 side, the hot water kept in the hot water supply pipe 4 of the heat exchanger 3 flows to the hot water 8 side. To do
Hot water desired by the user flows out to the Karan 8 side in a short time after the start of water supply.

Next, the basic operation of the bath reheating device 2 will be described. For example, when the bath operation switch 62 is turned on while the bathtub A is being heated, the bath-side control means 63b of the controller 57 determines the temperature of the hot water in the bathtub A based on the output of the bath temperature sensor 33. If the hot water temperature is lower than the predetermined boiling temperature, the circulation pump 31
Is activated and the bath gas burner 29 is ignited. In this ignition process, the bath combustion fan 36 is operated, and the original solenoid valve 15, the bath governor proportional solenoid valve 3
4 and the bath solenoid valve 35 is opened to supply combustion air and fuel gas to the bath gas burner 29 while operating the igniter 39 to generate a spark discharge in the spark plug 38.

Subsequently, the bath-side control means 63 b checks the ignition of the bath gas burner 29 by the output of the frame rod 37, and then, in accordance with the detection output of the bath temperature sensor 33,
The control of the bath governor proportional solenoid valve 34 and the bath combustion fan 36 controls the amount of combustion of the bath gas burner 29 while controlling the combustion of the bath gas burner 29 by the bath temperature sensor 33.
Until it reaches the boiling temperature.

When the temperature detected by the output of the bath temperature sensor 33 reaches the boiling temperature, the bath-side control means 63b sends a signal to the original solenoid valve 15, the proportional governor for bath governor 34 and the solenoid valve 35 for bath. The energization is stopped, and they are operated to the valve closing side (however, the original solenoid valve 15 is kept open while the hot water gas burner 5 of the hot water supply device 1 is burning).
Further, by stopping the bath combustion fan 36, the bath gas burner 29 is extinguished and the circulation pump 31 is turned off.
To stop.

The operation of the bath reheating device 2 described above is repeated every time the temperature detected by the output of the bath temperature sensor 33 falls below a temperature slightly lower than the boiling temperature. The temperature of the hot water inside is kept at a temperature near the boiling temperature.

The operation described above is a basic operation of the combined hot water supply apparatus of the present embodiment. In the present embodiment, the controller 57 stops the water supply of the hot water supply pipe 4 for performing the above-described heat retaining operation control of the hot water supply apparatus 1. When both the hot water supply gas burner 5 and the bath gas burner 29 are extinguished, the gas supply pipe 6 is connected between the governor proportional solenoid valve 16 and the bath governor proportional solenoid valve 34 and the original solenoid valve 15 as described above. Bath reheating device 2 to eliminate the negative pressure gradually generated in 30
The process of opening the bath solenoid valve 35 periodically for a predetermined period of time (hereinafter referred to as negative pressure elimination control process) is performed as follows.

That is, referring to FIG.
7 judges whether any of the hot water supply gas burner 5 and the bath gas burner 29 is burning (STEP 4).
1) When any of them is burning, the standby state of the negative pressure elimination control process is set. This is hot water supply gas burner 5
When any one of the bath gas burners 29 is burning, the negative pressure does not occur because the fuel gas flows through the gas supply pipe 6 or 30. In this case, the combustion of the hot water supply gas burner 5 and the bath gas burner 29 is performed as described above.

In such a standby state, when the controller 57 determines that neither the hot water supply gas burner 5 nor the bath gas burner 29 is burning, that is, when both the gas burners 5 and 29 are in the fire extinguishing state, A first timer for measuring a time interval (for example, 10 minutes) for opening the bath solenoid valve 35 to eliminate the negative pressure is started (STEP 4-2).

Next, controller 57 determines whether or not there is a request for combustion of hot water gas burner 5, that is, hot water supply device 1.
Is the timing to start the combustion of the hot water gas burner 5 in order to keep the hot water in the hot water supply pipe 4 of the heat exchanger 3 as described above, or the time when the water supply of the hot water supply pipe 4 is started. A determination is made (STEP 4-3). If it is any of these timings (there is a request for combustion of the hot water supply gas burner 5), the hot water supply side control means 63a immediately performs the ignition processing of the hot water supply gas burner 5 (the original electromagnetic valve 15, the hot water supply After that, the governor proportional solenoid valve 16 and the hot water supply solenoid valves 17 and 18 are opened, the combustion of the hot water gas burner 5 is started, and the first timer is reset (STEP 4-4).
The process returns to the process from P4-1.

If it is determined in STEP 4-3 that there is no request for combustion of the hot water supply gas burner 5, that is, it is not time to start the combustion of the hot water supply gas burner 5 for keeping the temperature while the water supply of the hot water supply pipe 4 is stopped. In this case, controller 57 further determines whether or not there is a request for combustion of bath gas burner 29, that is, whether or not it is time to perform the above-described boiling of hot water in bathtub A (STE).
P4-5). When there is a request for combustion of the bath gas burner 29, the bath-side control means 63b controls the ignition processing of the bath gas burner 29 (the original solenoid valve 15, the bath governor proportional solenoid valve 34, and the bath solenoid valve 35) as described above. After the bath gas burner 29 starts burning, the first timer is reset (STE).
P4-6), and returns to the processing from STEP 4-1.

On the other hand, if it is determined in STEP 5 that there is no request for combustion of the bath gas burner 29 (in this case, there is no request for combustion of the hot water supply gas burner 5), it is determined whether the first timer started in STEP 4-2 has timed out. (ST
In EP4-7), when the first timer is counting, the determination process from STEP4-3 is repeated.

If the first timer has timed out in STEP 4-7, that is, neither the hot water supply gas burner 5 nor the bath gas burner 29 generates a combustion request during the counting of the first timer, and both gas burners 5, 29 Is kept in the fire extinguishing state, the controller 57
The processing of TEP4-8 is performed, the first timer is reset, the timing of a second timer different from the first timer is started, and the bath of the bath reheating device 2 is further removed to eliminate the negative pressure. An operation for opening the solenoid valve 35 for a predetermined time (for example, 1.0 second) (hereinafter, this operation is referred to as a negative pressure releasing valve opening operation) is started. Here, the second timer is a timer for measuring a predetermined time during which the bath solenoid valve 35 is maintained in the open state in the negative pressure releasing valve opening operation.

Next, the controller 57 proceeds to the STEP 57
As in the case of 4-3, it is determined whether or not there is a request for combustion of the hot water supply gas burner 5 (STEP 4-9). If there is a request for combustion, the processing of STEP 4-10 is performed, and then S
It returns to the processing from TEP4-1. That is, STE
If there is a request to burn the hot water gas burner 5 in P4-9, the hot water supply side control means 63a immediately ignites the hot water gas burner 5 (the original solenoid valve 15, the governor proportional solenoid valve 16 for hot water supply, the hot water supply solenoid valve 17, 18 is opened)
To start the combustion of the hot-water supply gas burner 5, and at the same time, interrupt the processing of the negative pressure releasing valve opening operation, and instruct the bath-side control means 63b to close the bath electromagnetic valve 35, After further resetting the second timer,
The process returns to the process from STEP 4-1.

If there is no request to burn the hot water supply gas burner 5 according to the judgment in STEP 4-9 (when the water supply to the hot water supply pipe 4 is stopped and it is not the time to start the combustion of the hot water supply gas burner 5 for keeping the temperature). Is the controller 57
Determines whether or not there is a request for combustion of the bath gas burner 29 (STEP 4-11). After the bath-side control means 63b performs the ignition process of the bath gas burner 29 with the valve 35 kept open, and further resets the second timer (STEP 4).
-12), returning to the processing from STEP 4-1.

On the other hand, if it is determined in STEP 4-11 that there is no request for combustion of the bath gas burner 29 (in this case, there is no request for combustion of the hot water supply gas burner 5), it is determined whether the second timer has timed out. (STEP4-13) If the second timer is counting, the above STEP4-9 is executed.
Is repeated.

When the second timer has timed out in STEP 4-13, that is, during the time counting of the second timer (while the bath solenoid valve 35 is open), the combustion request for both the hot water supply gas burner 5 and the bath gas burner 29 is made. Does not occur and both gas burners 5 and 29 are kept in the fire extinguishing state, the controller 57 performs the processing of STEP 4-14 and closes the bath solenoid valve 35 by the bath-side control means 63b. The second timer is reset while the negative pressure releasing valve opening operation is terminated.
It returns to the process from.

By the negative pressure elimination control processing described above,
When the hot water supply gas burner 5 and the bath gas burner 29 are in a fire extinguishing state while the water supply of the hot water supply pipe 4 is stopped,
At the time interval of the time counted by the first timer, the bath solenoid valve 35 is opened for a predetermined time (time measured by the second timer), and the bath solenoid valve 35 is opened periodically. In this case, when the bath solenoid valve 35 is opened, the governor proportional solenoid valve for hot water supply 1
6 and the bath governor proportional solenoid valve 34 and the original solenoid valve 15, even if a negative pressure is generated in the gas supply pipes 6 and 30, the negative pressure is generated in the bath solenoid valve 35 and the bath. Since the air is opened to the atmosphere via the gas burner 29, the negative pressure is eliminated. By performing such opening of the bath solenoid valve 35 (opening operation for eliminating negative pressure) on a regular basis, the negative pressure which can be generated when both the hot water supply gas burner 5 and the bath gas burner 29 are extinguished is: At any point during the fire extinguishing state, it can always be sufficiently small. In addition, the first timer for measuring the time interval for performing the negative pressure releasing valve opening operation includes the hot water supply gas burner 5 and the bath gas burner 2.
9, since the timing is started from the time when both the fires are extinguished, that is, from the time when the negative pressure can be generated, it is ensured that the time measured by the first timer is appropriately set. It is possible to prevent a large negative pressure from being generated at any time in the fire extinguishing state of the gas burners 5, 29.

In the negative pressure elimination control process, for example, the passage of water through the hot water supply pipe 4 is started while the first timer is counting (at this time, the bath solenoid valve 35 is closed) and the combustion of the hot water gas burner 5 is started. As soon as a request arises, the hot water supply gas burner 5
And the combustion of the hot water supply gas burner 5 is started. Further, during the counting of the second timer, that is,
During the negative pressure relieving valve opening operation in which the bath solenoid valve 35 is opened, for example, when water supply of the hot water supply pipe 4 is started and a combustion request of the hot water gas burner 5 occurs, the negative pressure relieving valve is immediately opened. At the same time as the operation processing is interrupted and the bath solenoid valve 35 is closed, the ignition processing of the hot water supply gas burner 5 is performed and the combustion of the hot water supply gas burner 5 is started.

Therefore, even when the hot water supply pipe 4 is started to flow at any time when the hot water supply gas burner 5 and the bath gas burner 29 are in the fire extinguishing state, the combustion of the hot water supply gas burner 5 is immediately started. You.

In this case, when the water supply of the hot water supply pipe 4 is stopped and both the hot water supply gas burner 5 and the bath gas burner 29 are extinguished, the negative pressure releasing valve opening operation is performed as described above to open the gas supply pipes 6, 30. A large negative pressure does not occur inside the hot water supply gas burner 5 while the hot water supply gas burner 5 is burning for the heat keeping operation control or while the bath gas burner 29 is burning while the water supply is stopped. As a matter of course, a negative pressure does not occur. Therefore, even when the hot water supply gas burner 5 starts burning immediately as described above when the water supply through the hot water supply pipe 4 is started, a problem such as a loud ignition sound may occur. Therefore, combustion of the hot water supply gas burner 5 can be started.

[0086] When the hot water supply pipe 4 is thus started to be supplied with water, the combustion of the hot water supply gas burner 5 is started immediately as described above, whereby the hot water supply pipe 4 of the heat exchanger 3 of the hot water supply apparatus 1 is started.
Heating of the newly flowing water starts almost simultaneously with the start of the flow of water, and the required temperature rise of the water is promptly performed.

Therefore, the flow of water through the hot water supply pipe 4 causes the heat exchanger 3
The water newly flowing into the hot water supply pipe 4 reaches the target hot water temperature or a temperature close to the target hot water temperature including the water flowing into the hot water supply pipe 4 of the heat exchanger 3 immediately after the start of water supply, and flows out to the Karan 8 side. I do. For this reason, after the start of water supply, the time until the water newly flowing into the hot water supply pipe 4 of the heat exchanger 3 continuously becomes the hot water desired by the user and flows out to the Karan 8 side can be substantially minimized. . Moreover, in the present embodiment, the water staying in the hot water supply pipe 4 of the heat exchanger 3 during the stoppage of the water supply is heated and kept warm by the warming operation control. The temperature of the water newly flowing into the hot water supply pipe 4 of the heat exchanger 3 is raised, and the hot water kept in the hot water supply pipe 4 of the heat exchanger 3 during the stoppage of the water supply before the hot water is discharged to the Karan 8 side. The hot water is discharged to the Karan 8 side at the target hot water temperature or a temperature close to the target hot water temperature.

Thus, according to the present embodiment, the hot water supply pipe 4
After the start of water supply, the delay time until the hot water desired by the user stably and continuously flows out to the Karan 8 side can be made extremely short, and the use of the water heater 1 is excellent. It can be.

In the present embodiment, a combined hot water supply device having a bath reheating device 2 as a combustion device other than the hot water supply device 1 has been described. The present invention can be applied to a hot water supply device.

Further, in the present embodiment, the operation of releasing the negative pressure by opening the bath solenoid valve 35 is described. However, the operation is performed by opening one or both of the hot water supply solenoid valves 17 and 18. It may be. In such a case, the gas supply pipes 6, 30 are provided between the original solenoid valve 15 and the governor proportional solenoid valve 16 for hot water supply and the governor proportional solenoid valve 34 for bath.
Even if a negative pressure is generated in the inside, the location where the negative pressure is generated is opened to the atmosphere side through the hot water supply solenoid valves 17 and / or 18 and the hot water supply gas burner 5, so that the negative pressure is eliminated. .
However, since the hot water supply device 1 is generally used more frequently than the hot water reheating device 2, if the negative pressure release valve opening operation is performed by one or both of the hot water supply electromagnetic valves 17 and 18 of the hot water supply device 1, the hot water supply electromagnetic There are many opportunities to open and close the valves 17 and / or 18. Therefore, in order to uniformly extend the overall life of the combined hot water supply device, the negative pressure eliminating valve opening operation as in the above-described embodiment is performed by the bath electromagnetic device of the bath reheating device 2 that is used less frequently than the hot water supply device 1. Preferably, it is performed by a valve 35.

Next, an embodiment of the hot water supply apparatus of the present invention will be described with reference to FIGS. FIG. 5 is an overall system configuration diagram of the hot water supply apparatus of the present embodiment, and FIG. 6 is a flowchart for explaining the operation of the main part of the hot water supply apparatus.

Referring to FIG. 5, the hot water supply apparatus of the present embodiment has the same configuration as hot water supply apparatus 1 of the combined hot water supply apparatus shown in FIG. 1, and the hot water supply combined apparatus of FIG. This is a mechanical configuration in which the configuration related to the device 2 is removed. Therefore, in FIG. 5, the mechanical configuration of the hot water supply apparatus of the present embodiment is the same as that of the hot water supply apparatus 1 of the hot water supply combined apparatus of FIG.
The same reference numerals are given and the description is omitted here.

In FIG. 5, reference numeral 64 denotes a controller (operation control means) for controlling the operation of the water heater of the present embodiment, and 65 denotes a controller for instructing a desired operation of the water heater to the controller 64. Remote controller.

In this case, the remote controller 65 is provided with the remote controller 58 shown in FIG.
It is the same as that of the first embodiment,
A main operation switch 66 for instructing the controller 64 to stop, a heat insulation switch 67 for causing the controller 64 to perform the heat insulation operation control as described in relation to the hot water supply combined device, and a controller 64 for setting a target hot water temperature desired by the user. Is provided with a temperature setting switch 68 for instructing the temperature setting.

The controller 64 has basically the same function as the hot water supply side control means 63a of the controller 57 shown in FIG. , Water supply sensor 9, water supply temperature sensor 11, tap water temperature sensor 12, heat exchange temperature sensor 13, based on the detection output of various sensors such as frame rod 25, the original solenoid valve 15, governor proportional solenoid valve 16 for hot water supply, hot water supply solenoid valve 17, 18, hot water supply combustion fan 24,
By controlling the operations of the water amount servo valve 10, the bypass servo valve 14, and the igniter 39, the required operation of the water heater 1 is performed.

Next, the operation of the hot water supply apparatus of this embodiment will be specifically described.

First, in the hot water supply apparatus of the present embodiment, the basic operation in the state where the main operation switch 66 of the remote controller 65 is turned ON and the state where the heat retention switch 67 is turned ON are the same as the above-described hot water supply complex. The operation is performed in exactly the same manner as the hot water supply device 1 of the device.

That is, when the water supply through the hot water supply pipe 4 is started, the hot water supply gas burner 5 is ignited by the control processing of the controller 64 to start burning, and the temperature detected by the hot water temperature sensor 12 is set by the remote controller 65. Adjustment of the combustion amount of the hot water supply gas burner 5 and the water flow amount of the bypass pipe 7 is performed so as to match the hot water temperature. And hot water pipe 4
Is stopped, the hot water supply gas burner 5 is extinguished.

Further, when the heat retaining switch 67 is turned on, the above-described heat retaining operation control is performed while the water supply of the hot water supply pipe 4 is stopped. That is, while the hot water supply pipe 4 is stopped flowing water, the hot water in the hot water supply pipe 4 of the heat exchanger 3 is kept warm by intermittently performing the combustion of the hot water supply gas burner 5 at a required timing.

On the other hand, in the hot water supply apparatus of the present embodiment, the controller 64 controls the governor proportional electromagnetic when the hot water supply gas burner 5 is extinguished while the hot water supply pipe 4 for controlling the warming operation of the hot water supply apparatus 1 is stopped. A negative pressure gradually generated in the gas supply pipe 6 between the valve 16 and the original solenoid valve 15 (this negative pressure is applied to the governor proportional solenoid valve 16 while the hot water supply gas burner 5 is extinguished).
Of the hot water supply solenoid valves 17 and 18 (for example, the hot water supply solenoid valve 17 in the present embodiment) is periodically set to a predetermined value in order to eliminate the fuel gas absorbed by the diaphragm 43 (see FIG. 3). The negative pressure elimination control process for opening the valve hourly is performed as follows.

That is, referring to FIG. 6, controller 64 determines whether or not hot water supply gas burner 5 is burning (STEP 6-1). Since no negative pressure is generated in the inside, a standby state of the negative pressure elimination control process is set.

In such a standby state, when the controller 64 determines that the hot-water supply gas burner 5 is not burning, that is, when the hot-water supply gas burner 5 is in a fire-extinguishing state, the controller 64 supplies the hot-water supply electromagnetic wave to eliminate the negative pressure. A first timer for measuring a time interval (for example, 10 minutes) for opening the valve 17 is started (STEP 6-2).

Next, controller 64 determines whether or not there is a request for combustion of hot water gas burner 5, that is, hot water supply device 1.
Is the timing to start the combustion of the hot water gas burner 5 in order to keep the hot water in the hot water supply pipe 4 of the heat exchanger 3 as described above, or the time when the water supply of the hot water supply pipe 4 is started. A determination is made (STEP 6-3). If it is any of these timings (there is a request for combustion of the hot water supply gas burner 5), the ignition processing of the hot water supply gas burner 5 is immediately performed (the original solenoid valve 15, the hot water supply governor proportional solenoid valve 16, and the hot water supply solenoid valve). 17 and 18 are opened), the combustion of the hot water gas burner 5 is started, and the first timer is reset (STEP 6-4).
The process returns to the process from STEP 6-1.

If it is determined in STEP 6-3 that there is no request for combustion of the hot water supply gas burner 5, that is, it is not time to start the combustion of the hot water supply gas burner 5 for keeping the temperature while the water supply of the hot water supply pipe 4 is stopped. In this case, the controller 64 determines whether or not the time of the first timer started in STEP 6-2 has expired (STEP 6-5).
Is repeated.

When the time of the first timer has expired in STEP 6-5, that is, when the request for combustion of the hot water gas burner 5 has not been made during the counting of the first timer and the hot water gas burner 5 is kept in the fire extinguishing state, Is the controller 6
4 performs the processing of STEP 6-6, resets the first timer, starts the timing of a second timer different from the first timer, and furthermore, the hot water supply solenoid valve 17 for eliminating the negative pressure. Is opened for a predetermined time (for example, 1.0 second). The second timer is a timer for measuring a predetermined time during which the hot-water supply electromagnetic valve 17 is kept in the open state in the negative pressure releasing valve opening operation.

Next, the controller 64 executes the above-mentioned STEP.
As in the case of 6-3, it is determined whether or not there is a request for combustion of the hot water gas burner 5 (STEP 6-7). If there is a request for combustion, the process of opening the negative pressure elimination valve is interrupted and the hot water supply is stopped. While the solenoid valve 17 is kept in the open state, the hot water supply gas burner 5 is ignited (for example, the original solenoid valve 15 and the hot water governor proportional solenoid valve 16 are opened) to perform the hot water supply gas burner 5.
Is started, the second timer is reset (STEP 6-8), and thereafter, the process returns to STEP 1.

In this case, at the time of interrupting the processing of the negative pressure releasing valve opening operation, the original electromagnetic valve 15 and the governor proportional electromagnetic valve 16 for hot water supply are kept open without closing the hot water supply electromagnetic valve 17. By performing the ignition process of the hot water supply gas burner 5 with the valve opened, the hot water supply gas burner 5 can be quickly ignited.

On the other hand, if it is determined in STEP 6-7 that there is no request for burning the hot water gas burner 5, it is determined whether or not the second timer has expired (STEP 6-9).
If the timer is counting, the determination processing from STEP 6-7 is repeated. When the second timer has timed out in STEP 6-9, that is, during the time counting of the second timer (while the hot water supply electromagnetic valve 17 is being opened), no combustion request for the hot water gas burner 5 is generated, and the hot water gas burner 5 is extinguished. If held in the state, the controller 64
The processing of TEP6-10 is performed, the hot water supply electromagnetic valve 17 is closed to end the negative pressure releasing valve opening operation, the second timer is reset, and thereafter, the processing returns to STEP1.

By the negative pressure elimination control process described above,
When the hot-water supply pipe 4 is stopped and the hot-water supply gas burner 5 is in a fire extinguishing state, the hot-water supply electromagnetic valve 17 is opened for a predetermined time (time-measurement time of the second timer) at intervals of the time measured by the first timer. The solenoid valve 17 is opened periodically. In this case, when the hot water supply electromagnetic valve 17 is opened, even if a negative pressure is generated in the gas supply pipe 6 between the governor proportional electromagnetic valve 16 and the original electromagnetic valve 15, the location where the negative pressure is generated may occur. The negative pressure is eliminated by being opened to the atmosphere side through the hot water supply electromagnetic valve 17 and the hot water supply gas burner 5. And
Opening of such hot water supply electromagnetic valve 17 (opening operation to eliminate negative pressure)
Is periodically performed, the negative pressure that can be generated in the fire-extinguishing state of the hot water supply gas burner 5 can always be sufficiently small at any point in the fire-extinguishing state. Moreover,
The first timer for measuring the time interval for performing the negative pressure releasing valve opening operation starts the timing from the time when the hot water supply gas burner 5 is extinguished, that is, from the time when the negative pressure can be generated. By appropriately setting the time measured by the first timer, it is possible to reliably prevent a large negative pressure from being generated at any time in the fire extinguishing state of the hot water supply gas burner 5.

In the negative pressure elimination control process, for example, during the time counting by the first timer (at this time, the hot water supply electromagnetic valves 17 and 18 are closed), for example, the water supply through the hot water supply pipe 4 is started and the hot water supply gas burner 5 is started. When the combustion request is made, the hot water supply gas burner 5 is immediately ignited, and the combustion of the hot water supply gas burner 5 is started.

Further, during the time counting by the second timer, that is, during the negative pressure releasing valve opening operation in which the hot water supply electromagnetic valve 17 is opened, for example, the flow of water through the hot water supply pipe 4 is started and the hot water supply gas burner 5 is turned on. When a combustion request occurs, the processing of the negative pressure release valve opening operation is immediately interrupted, and the hot water supply gas burner 5 is ignited while the hot water supply electromagnetic valve 17 is kept in the open state. Combustion is started.

Therefore, no matter what time the hot water supply gas burner 5 is extinguished, and at any point in time when the hot water supply pipe 4 starts to flow water, the ignition processing of the hot water supply gas burner 5 is immediately performed, and the combustion of the gas burner 5 is started. Starts.

In this case, when the hot water supply gas burner 5 is extinguished while the hot water supply pipe 4 is stopped flowing water, the negative pressure releasing valve opening operation may cause a large negative pressure in the gas supply pipe 6 as described above. In addition, since the hot water supply gas burner 5 does not generate the negative pressure while the combustion is being performed for the heat retention operation control while the water supply is stopped, the hot water supply gas Even if the combustion of the hot water supply gas burner 5 is started immediately upon the start of the water, the combustion of the hot water supply gas burner 5 can be started without generating a problem such as a loud ignition sound.

[0114] When the hot water supply pipe 4 is thus started to be supplied with water, the combustion of the hot water supply gas burner 5 is immediately started as described above. The time required for the water newly flowing into the hot water supply pipe 4 of the heat exchanger 3 to become the hot water continuously desired by the user and to flow out to the curan 8 side can be substantially minimized. Moreover, also in the present embodiment, the water staying in the hot water supply pipe 4 of the heat exchanger 3 during the stoppage of the water supply is heated and kept warm by the warming operation control. As a result, the temperature of the water newly flowing into the hot water supply pipe 4 of the heat exchanger 3 is increased, and the hot water that has been kept warm in the hot water supply pipe 4 of the heat exchanger 3 during the stoppage of the water supply before the hot water flows out to the curran 8 side. Reaches the target hot water temperature or a temperature close to the target hot water temperature and flows out to the Karan 8 side.

Thus, according to the hot water supply apparatus of the present embodiment, the delay time until the hot water desired by the user stably and continuously flows out to the curan 8 after the water supply of the hot water supply pipe 4 is started is extremely reduced. The length of the hot water supply device can be shortened, and the usability of the hot water supply device can be improved.

In the present embodiment, the negative pressure releasing valve opening operation is performed by opening the hot water supply solenoid valve 17, but may be performed by opening the hot water supply solenoid valve 18, or alternatively, the hot water supply solenoid valve may be opened. The opening may be performed by alternately opening the valves 17 and 18 or simultaneously opening both of them.

Further, in the above-described embodiment of the combined hot water supply apparatus and the embodiment of the hot water supply apparatus, while the water supply of the hot water supply pipe 4 is stopped,
Although an example in which the water in the hot water supply pipe 4 of the heat exchanger 3 is kept warm is shown, the present invention can also be applied to a combined hot water supply apparatus or a hot water supply apparatus that does not keep such heat.
That is, even when the water in the hot water supply pipe 4 of the heat exchanger 3 is not kept warm, the negative pressure elimination control processing is performed in the same manner as in the above-described embodiments while the water supply of the hot water supply pipe 4 is stopped. By that
Immediately upon the start of water flow, the hot water supply gas burner 5 can be ignited and its combustion can be started immediately (there is no need to perform negative pressure elimination processing when the hot water supply gas burner 5 burns). After the start, the time until the hot water desired by the user flows out can be minimized.

Further, in the above-described embodiment of the combined hot water supply apparatus and the embodiment of the hot water supply apparatus, the hot water supply gas burner 5 for keeping the hot water in the hot water supply pipe 4 of the heat exchanger 3 during the negative pressure releasing valve opening operation. When the combustion request of the hot water supply device or the combustion request of the bath gas burner 29 in the combined hot water supply device is generated, the processing of the negative pressure release valve opening operation is interrupted. Compared with the case where water is started, generally, the degree of request for promptness of the combustion start of the hot water supply gas burner 5 and the bath gas burner 29 is low, and the time of the normal negative pressure release valve opening operation (time measured by the second timer). It doesn't have to be that long. Therefore, during the negative pressure release valve opening operation,
When a request for combustion of the hot water supply gas burner 5 or a request for combustion of the bath gas burner 29 occurs to keep the temperature of the hot water in the hot water supply pipe 4 of the heat exchanger 3, the processing of the negative pressure releasing valve opening operation is interrupted. Until the second timer times out, and then the hot water gas burner 5 and the bath gas burner 29
May be started.

[Brief description of the drawings]

FIG. 1 is an overall system configuration diagram of an embodiment of a combined hot water supply apparatus of the present invention.

FIG. 2 is a block diagram of a control system of the combined hot water supply apparatus of FIG. 1;

FIG. 3 is a sectional view of a governor proportional solenoid valve provided in the hot water supply combined device of FIG. 1;

FIG. 4 is a flowchart for explaining the operation of the main part of the combined hot water supply apparatus of FIG. 1;

FIG. 5 is an overall system configuration diagram of an embodiment of the hot water supply apparatus of the present invention.

FIG. 6 is a flowchart for explaining the operation of the main part of the hot water supply apparatus of FIG. 5;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Hot water supply apparatus of a combined hot water supply apparatus, 2 ... Bath reheating apparatus (combustion equipment), 3 ... Heat exchanger, 4 ... Hot water supply pipe, 5 ... Hot water supply gas barber (first gas burner), 6 ... Gas supply pipe, 15 ... yuan Solenoid valve (first open / close solenoid valve), 16 ... governor proportional solenoid valve for hot water supply, 17, 18 ... hot water supply solenoid valve (second open / close solenoid valve), 29
... bath gas burner (second gas burner), 30 ... gas supply pipe (gas supply pipe for another device), 34 ... bath governor proportional solenoid valve (governor proportional solenoid valve for another device), 35 ... bath solenoid valve (third open / close) Solenoid valves), 57, 64 ... Controller (operation control means).

Claims (8)

[Claims] 1. A gas burner for heating water flowing through a hot water supply pipe via a heat exchanger, a first opening / closing solenoid valve disposed in order from an upstream side of a gas supply pipe for supplying a fuel gas to the gas burner, and a governor. Hot water supply comprising a proportional solenoid valve and a second on-off solenoid valve, and operation control means for performing combustion of the gas burner while supplying the fuel gas to the gas burner with the respective solenoid valves opened while water flows through the hot water supply pipe. In the apparatus, the operation control means may be configured to eliminate the negative pressure generated at a location between the first opening / closing solenoid valve and the governor proportional solenoid valve of the gas supply pipe during the stoppage of water supply of the hot water supply pipe. Means for periodically performing a negative pressure releasing valve opening operation of opening the second on-off solenoid valve for a predetermined time at predetermined time intervals;
When at least the start timing of water supply through the hot water supply pipe is different from the timing of performing the negative pressure elimination valve opening operation, combustion of the gas burner is started immediately in response to the start of water supply through the hot water supply pipe. apparatus. 2. The method according to claim 1, wherein the operation control means starts timing of the predetermined time interval defining the timing of performing the negative pressure releasing valve opening operation every time the gas burner changes from the combustion state to the fire extinguishing state. The hot water supply apparatus according to claim 1, wherein 3. The operation control means according to claim 1, wherein when the start timing of water supply through said hot water supply pipe is during said negative pressure eliminating valve opening operation.
The process of the negative pressure releasing valve opening operation is immediately interrupted in response to the start of water flow through the hot water supply pipe, and the combustion of the gas burner is started while the second opening / closing solenoid valve is kept open. The hot water supply device according to claim 1 or 2, wherein 4. The means for intermittently burning the gas burner so as to keep the temperature of the water in the hot water supply pipe in the heat exchanger at a predetermined temperature while stopping the flow of water through the hot water supply pipe. The hot water supply apparatus according to any one of claims 1 to 3, further comprising: performing the negative pressure relieving valve opening operation in a state in which combustion of the gas burner is stopped while the flow of water through the hot water supply pipe is stopped. 5. A hot water supply device having a first gas burner for heating water flowing through a hot water supply pipe via a heat exchanger, and a second gas burner for heating an object to be heated other than the water flowing through the hot water supply pipe. A first opening / closing solenoid valve, a hot water supply governor proportional solenoid valve, and a second hot water supply governor which are sequentially interposed from the upstream side of a gas supply pipe for supplying fuel gas to the first gas burner.
An on-off solenoid valve, and a gas supply pipe for another device branched from the gas supply pipe between the first on-off solenoid valve and the hot water supply governor proportional solenoid valve to supply fuel gas to the second gas burner; A governor proportional solenoid valve and a third on-off solenoid valve for another device which are sequentially interposed in the gas supply pipe for another device from the upstream side thereof,
The first opening / closing solenoid valve during the passage of water through the hot water supply pipe of the hot water supply device;
With the governor proportional solenoid valve for hot water supply and the second on-off solenoid valve opened, the first gas burner is supplied while supplying the first gas burner with the fuel gas.
While burning the gas burner, while the combustion device is operating, the first open / close solenoid valve, the governor proportional solenoid valve for another device and the third open / close solenoid valve are opened to supply fuel gas to the second gas burner. A hot water supply combined device having operation control means for performing combustion of the second gas burner, wherein the operation control means is configured to stop water supply to a hot water supply pipe of the water heater and to stop operation of the combustion device. In order to eliminate a negative pressure generated at a location between the first on-off solenoid valve of the gas supply pipe and the governor proportional solenoid valve for hot water supply and the governor proportional solenoid valve for another device, the second on-off solenoid valve and Means for periodically opening at a predetermined time interval a negative pressure releasing valve opening operation for opening at least one of the third opening / closing solenoid valves for a predetermined time; A combined hot water supply apparatus according to claim 1, wherein when the timing is different from the timing of the negative pressure releasing valve opening operation, the combustion of the first gas burner is started immediately in response to the start of water flow through the hot water supply pipe. 6. The operation control means includes means for controlling the negative pressure each time one of the first and second gas burners changes from a burning state to a state in which both the first and second gas burners are extinguished. The combined hot water supply apparatus according to claim 5, wherein the timing of the predetermined time interval that defines the timing at which the cancellation valve opening operation is performed is started. 7. The on / off solenoid valve for performing the negative pressure elimination valve opening operation is the third on / off solenoid valve, and the operation control means includes:
When the start timing of water supply through the hot water supply pipe of the hot water supply device is in the middle of the negative pressure release valve opening operation, the processing of the negative pressure release valve opening operation is immediately interrupted in response to the start of water supply through the hot water supply pipe. The combined hot water supply apparatus according to claim 5 or 6, wherein combustion of the first gas burner is started while closing the third opening / closing solenoid valve. 8. The operation control means intermittently controls the combustion of the first gas burner so as to keep the temperature of the water in the hot water supply pipe in the heat exchanger at a predetermined temperature while the water supply of the hot water supply pipe of the hot water supply apparatus is stopped. And means for performing the negative pressure elimination valve-opening operation in a state in which combustion of the first gas burner is stopped while the flow of water through the hot water supply pipe of the water heater is stopped and the operation of the combustion equipment is stopped. The hot water supply device according to any one of claims 5 to 7, wherein: