JP3242048B2 - Water heater - Google Patents

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 for supplying hot water to a bathtub or a kitchen.

[0002]

2. Description of the Related Art For example, in an instant gas hot water supply apparatus, a hot water supply heat exchanger that is heated by a hot water supply burner and raises the temperature of water supplied from a water supply pipe, and a flow rate of fuel gas supplied to the hot water supply burner is adjusted. A hot water supply combustion fan that supplies combustion air to the hot water supply burner, a hot water supply temperature sensor that detects the temperature of hot water supplied from the hot water supply heat exchanger through a hot water supply pipe, and a heat exchanger. And a flowing water sensor for detecting the presence or absence of flowing water passing through the water.

[0003] In such a gas hot water supply apparatus, a user opens a callan or the like connected to the tip of a hot water supply pipe,
When water supply to the heat exchanger is started and flowing water passing through the heat exchanger is detected by the flowing water sensor, the hot water supply burner is activated in response to the detection of the flowing water, and the water in the heat exchanger is heated. Be started. Then, the supply flow rate of the fuel gas to the hot water supply burner is adjusted by the gas proportional valve so that the detection temperature of the hot water supply temperature sensor matches the predetermined target hot water supply temperature, and the rotation speed of the hot water supply fan is changed. The supply flow rate of the combustion air to the hot water supply burner is adjusted, and the combustion amount of the hot water supply burner is adjusted.

[0004] Here, the combustion of the hot water supply burner is started when the user opens the callan and the flowing water sensor detects flowing water passing through the heat exchanger, as described above. Therefore, the hot water that passes through the heat exchanger and is heated from the heat exchanger is actually supplied from the heat exchanger in addition to the water remaining in the hot water supply pipe from the heat exchanger to the heat exchanger, and also stays in the heat exchanger. It is after the water that was being supplied from Kallang.
For this reason, there is a time delay from when the user opens the curan to when the hot water is actually supplied to the curan, which is inconvenient to use.

[0005] In order to reduce such a time delay from the opening of the curan to the start of hot water supply, a heat exchange temperature sensor for detecting the temperature of hot water near the outlet from the heat exchanger to the hot water supply pipe is provided. Even when the hot water supply is stopped (when running water is not detected by the running water sensor), a heat retention control for intermittently operating the hot water supply burner is performed so that the temperature detected by the heat exchange temperature sensor is maintained in a predetermined range. A gas hot water supply device is known (JP-A-9-243169, etc.).

As described above, by performing the heat retention control for keeping the hot water in the heat exchanger within a predetermined temperature range in advance, the hot water is supplied from when the user opens the curan to when the hot water is supplied to the curan. The amount of water to be supplied can be limited to the water staying in the hot water supply pipe from the heat exchanger to the curan, so that the delay time until hot water is supplied to the curan is shorter than when the heat retention control is not performed. be able to.

Incidentally, in addition to the hot water supply, in order to perform additional heating of the hot water in the bathtub or hot water floor heaters, if another heating means is provided in addition to the hot water supply means having the above-described hot water supply function, In order to reduce the installation sparseness, the hot water supply means and the heating means are arranged in an integrated housing, and the combustion exhaust gas of the hot water supply means and the combustion exhaust gas of the heating means are provided in the housing. It is conceivable to adopt a configuration in which the exhaust gas is discharged from the collective exhaust pipe.

[0008] With this configuration, even if only the hot water supply burner or only the heating burner of the heating means is burned alone, a hot water supply combustion fan for supplying combustion air to the hot water supply burner. And a heated combustion fan for supplying combustion air to the heated burner.

[0009] This is because, for example, when the heating burner is burned, the hot water supply combustion fan is operated together with the heating combustion fan to generate an air flow from the hot water supply combustion fan toward the collective exhaust port. This is a process for preventing the exhaust gas from flowing back to the hot water supply burner side. By this processing, it is possible to prevent the combustion exhaust gas flowing from the heating burner toward the collective exhaust port from flowing toward the hot water supply burner, being sucked into the hot water supply combustion fan again, and deteriorating the combustion state of the hot water supply burner.

[0010] However, the inventors of the present application disclose a hot water supply apparatus in which the hot water supply means and the other heating means are arranged in an integral housing and the hot water supply combustion fan and the heating combustion fan are operated together. Has found that the following disadvantages occur when performing the above-mentioned heat retention control.

That is, when the hot water supply means executes the heat retention control and the hot water supply burner is operating intermittently, the heating burner starts combustion and when the hot water supply combustion fan operates together with the heating combustion fan, the hot water supply combustion fan The outside air sucked from the outside of the housing hits the hot water supply heat exchanger. Therefore, especially when the outside air temperature is low, the temperature of the hot water that has stayed and kept warm in the hot water supply heat exchanger rapidly decreases.

Therefore, in the heat retention control, the time during which the temperature of the hot water in the hot water supply heat exchanger falls from the upper limit to the lower limit of the predetermined temperature range is shortened. Therefore, it has been found that the interval for operating the hot water supply burner to keep the temperature of the hot water in the hot water supply heat exchanger becomes short, and there is a disadvantage that the consumption of fuel gas in the heat retention control increases.

[0013]

SUMMARY OF THE INVENTION An object of the present invention is to provide a hot water supply apparatus which solves the above disadvantages and prevents a large amount of fuel gas from being consumed during heat retention control.

[0014]

In order to achieve the above object, the present invention provides a hot water supply heat exchanger for heating water supplied by a water supply pipe by a hot water supply burner, and adjusting a fuel supply amount to the hot water supply burner. Fuel supply adjusting means, a hot water supply combustion fan for supplying combustion air to the hot water supply burner, a hot water supply pipe from which hot water heated by the hot water supply heat exchanger is discharged, and a temperature of hot water supplied from the hot water supply pipe. Hot water supply means having a hot water supply temperature sensor for detecting, a heat exchange temperature sensor for detecting the temperature of hot water near the outlet of the hot water supply heat exchanger, and a flowing water sensor for detecting the presence or absence of flowing water passing through the hot water supply heat exchanger; A heating means having a heating burner for heating an object to be heated other than water supplied from the water supply pipe; a heating combustion fan for supplying combustion air to the heating burner; the hot water supply means and the heating means And store the said A casing having a collective exhaust port for collecting and discharging the combustion exhaust gas of the hot water burner and the combustion exhaust gas of the heating burner; and operating the heating burner under predetermined conditions. And a heating control means for performing heating control for operating both the hot water supply combustion fan and the hot water supply combustion fan, so that a temperature detected by the hot water supply temperature sensor matches a predetermined hot water supply target temperature when flowing water is detected by the flowing water sensor. Hot water supply control for adjusting the combustion amount of the hot water supply burner by the fuel supply adjusting means; and when the flowing water sensor does not detect flowing water, the temperature detected by the heat exchange temperature sensor becomes lower than a predetermined heat retention start temperature. And a hot water supply control means for performing heat retention control for operating the hot water supply burner for a heating time determined according to a predetermined heat retention target temperature. In location, the hot water supply control means by the heating control means, when the heating control is being executed, and inhibits the execution of the heat keeping control.

According to the present invention, the hot water supply control means prohibits the execution of the heat retention control when the heating control is being executed. Therefore, the heating burner is operated, the heating combustion fan and the hot water supply combustion fan are both operated, and the hot water in the hot water supply heat exchanger is rapidly cooled by blowing air from the hot water supply combustion fan. No heat retention control is performed.

Thus, in the heat retention control, the time for decreasing the temperature of the hot water in the hot water supply heat exchanger from the heat retention target temperature to the heat retention start temperature is shortened, and the hot water supply burner is frequently operated, so Can be prevented from being consumed.

[0017] The hot water supply control means may include: when the heating control is started by the heating control means while the hot water supply burner is operating during execution of the heat retention control;
When the operation of the hot water supply burner is stopped, the heat retention control is interrupted, and after the heating control is terminated, the heat retention control is restarted.When the heat retention control is being performed and the hot water supply burner is not operating, When the heating control is started by the heating control means, the heat retention control is immediately interrupted, and after the heating control is completed, the heat retention control is restarted.

According to the present invention, the hot water supply control means suspends the heat retention control when the heating control is started during the execution of the heat retention control, and executes the heat retention control after the heating control is completed. To resume. Therefore, the heating control is started, and the heat retention control is not continued in a state where the hot water in the hot water supply heat exchanger is rapidly cooled by the blowing from the hot water supply combustion fan, and as described above, It is possible to prevent a large amount of fuel from being consumed.

[0019]

FIG. 1 shows an example of an embodiment of the present invention.
This will be described with reference to FIGS. 1 is an overall configuration diagram of the hot water supply apparatus of the present invention, FIG. 2 is an external view of a remote controller provided in the hot water supply apparatus shown in FIG. 1, and FIGS. 3 to 6 are operation flowcharts of the hot water supply apparatus shown in FIG. .

Referring to FIG. 1, hot water supply apparatus 1 comprises hot water supply means 2 and additional heating means 3 (corresponding to the heating means of the present invention), and is provided by controller 4 with hot water supply means 2 and additional heating means 3.
Is controlled.

The hot water supply means 2 includes a hot water supply heat exchanger 6 heated by a hot water supply burner 5 operated by a control signal from the controller 4, a water supply pipe 7 connected to a water supply pipe (not shown) and supplying water to the hot water supply heat exchanger 6. A water quantity servo 8 for adjusting the opening of the water supply pipe 7 according to a control signal from the controller 4, a water supply temperature sensor 9 for detecting the temperature of the supplied water and outputting it to the controller 4, and a running water passing through the hot water heat exchanger 6. Running water sensor 1 that detects presence and outputs to controller 4
0, a hot water supply pipe 11 from which hot water heated by the hot water supply heat exchanger 6 is supplied, a bypass pipe 12 for mixing a part of water supplied to the water supply pipe 7 into the hot water supply pipe 11, and a bypass by a control signal from the controller 4 A bypass servo 13 for adjusting the opening of the pipe 12; a controller 4 for detecting the temperature of hot water in a hot water supply pipe 25 downstream of a junction of the hot water supply pipe 11 and the bypass pipe 12;
, A heat exchange temperature sensor 15 that detects the temperature of the hot water near the outlet of the hot water supply heat exchanger 6 and outputs it to the controller 4, and a gas supply pipe 16. There are provided hot water supply gas electromagnetic valves 18 and 19 which are opened and closed, and a hot water supply gas proportional valve 20 (corresponding to fuel supply adjusting means of the present invention) whose opening is adjusted by a control signal from the controller 4.

The rotation speed of the hot water supply means 2 is varied by a control signal from the controller 4, and a hot water supply combustion fan 21 for supplying combustion air to the hot water supply burner 5, and a control signal from the controller 4 via an igniter 23. And a hot water supply ignition plug 22 for applying a high voltage to the hot water supply burner 5 and a hot water supply frame rod 24 for detecting a combustion state of the hot water supply burner 5 and outputting the combustion state to the controller 4.

On the other hand, the reheating unit 3 comprises a bath heat exchanger 4 which is heated by a bath burner 40 (corresponding to a heating burner of the present invention) which is operated by a control signal from the controller 4.
1. A circulating pump 44 for circulating hot water in a bathtub 42 through a circulation path 43 and a bath heat exchanger 41 according to a control signal from the controller 4, and a bath for detecting the temperature of the hot water in the bathtub 42 and outputting it to the controller 4. Temperature sensor 45, circulation path 43
A water flow switch 46 for detecting the presence or absence of a water flow inside and outputting to the controller 4, a bath gas solenoid valve 47 provided in the gas supply pipe 16 and opened and closed by a control signal from the controller 4, and a constant supply amount of fuel gas. A gas governor 48 for keeping the

The reheating unit 3 has a rotation speed variable according to a control signal from the controller 4, and a bath combustion fan 49 (corresponding to a heating combustion fan of the present invention) for supplying combustion air to the bath burner 40. A high voltage is applied from the igniter 23 according to a control signal from the controller 4, and a bath ignition plug 50 for igniting the bath burner 40 and a combustion state of the bath burner 40 are detected.
And a bath frame rod 51 for outputting to the bathroom.

The circulation path 43 includes a pouring solenoid valve 52 which is opened and closed by a control signal from the controller 4, and a bath hot water supply pipe 5.
It is connected to the hot water supply pipe 25 via a three-way valve 54. Thereby, hot water is supplied from hot water supply means 2 to bathtub 42 by opening pouring electromagnetic valve 52. 56 is bathtub 4
A flow rate sensor 57 detects the flow rate of hot water supplied to the bath 2 and outputs it to the controller 4. Reference numeral 57 denotes a water level sensor that detects the water level of the hot water in the bathtub 42 by hydrostatic pressure and outputs the same to the controller 4.
Reference numeral 27 denotes a pressurized safety valve and a water drainage tap used to release the pressure when the pressure in the hot water supply heat exchanger 6 rises and to drain the water in the hot water supply heat exchanger 6 and the hot water supply pipe 11.

The controller 4 includes a hot water supply control means 31 and a reheating control means 32 (corresponding to the heating control means of the present invention), and is constituted by a CPU, a ROM, a RAM, and the like. The hot water supply means 2 and the additional heating means 3 are controlled according to the mode.

The hot water supply means 2 and the additional heating means 3 are arranged in an integral housing 80, and the exhaust gas of the hot water supply means 2 and the additional exhaust gas of the additional heating means 3 are provided in the housing 80. It is configured to discharge from the exhaust port 81.

When burning the bath burner 40, the additional heating control means 32 operates the hot water supply combustion fan 21 together with the bath combustion fan 49. As a result, as shown in FIG. 1, when only the bath burner 40 is burned, an air flow (white arrow) from the hot water supply combustion fan 21 toward the exhaust port 83 of the hot water supply means 2 is generated, and the additional heating means 3 is heated. The combustion exhaust gas discharged from the exhaust port 82 is prevented from flowing back to the hot water supply burner 5.

Next, referring to FIG.
An operation switch 60 for instructing an operation start and an operation stop of the entire hot water supply apparatus 1, and a predetermined amount of hot water supplied to the bathtub 42;
An automatic switch 61 for instructing the start of automatic operation for performing additional heating up to a predetermined boiling temperature after the hot water supply, and a hot water supply pipe 25;
Hot water supply temperature switch 62 for setting a hot water supply target temperature to
A clock setting switch 63 for specifying a clock time setting mode for setting the time of the internal clock; a reservation setting switch 64 for specifying a reservation time setting mode for setting the reservation time for the automatic operation; a clock time setting mode and a reservation time setting In the mode, an hour setting switch 65, a minute setting switch 66 for setting each time, a reservation operation switch 67 for setting the reservation for the automatic operation, and a heat retaining function for keeping the temperature of hot water in the hot water supply heat exchanger 6 within a predetermined range. It has a heat retention switch 68 for instructing execution of operation, and a display unit 69 for displaying hot water supply temperature, time, and the like.

The user operates the operation switch 6 of the remote controller 30.
When 0 is operated, the entire hot water supply apparatus 1 starts operating, and the operation lamp 70 built in the operation switch 60 is turned on.
In this state, when the user opens the callan 26 connected to the tip of the hot water supply pipe 25, water supply to the water supply pipe 7 is started,
The flowing water sensor 10 detects flowing water. Controller 4
When the start of water supply to the water supply pipe 7 is recognized based on the output from the flowing water sensor 10, the hot water supply combustion fan 21 is operated, the original gas solenoid valve 17, the hot water supply gas solenoid valves 18, 19 are opened, and the igniter A high voltage is applied to 23 and a spark discharge is generated in the hot water supply ignition plug 22 to perform the ignition processing of the hot water supply burner 5.

When the hot water supply control means 31 provided in the controller 4 recognizes from the output of the hot water supply frame rod 24 that the hot water supply burner 5 has been ignited, the detected temperature of the hot water supply temperature sensor 14 and the remote control 30 are used. The hot water gas proportional valve 20 is adjusted so that the set hot water supply target temperature matches.
Hot water supply control is performed to adjust the opening degree of the hot water supply combustion fan 21, the opening and closing of the hot water supply gas solenoid valves 18 and 19, the opening degree of the water volume servo 8, and the opening degree of the bypass servo 13. As a result, hot water at the temperature set by the user is supplied from the curan 26.

In the hot water supply control, the target combustion amount of the hot water supply burner 5 is determined so that the outlet temperature of the hot water from the heat exchanger 6 becomes higher than the target hot water supply temperature. The opening degree of the hot water supply gas proportional valve 20, the rotation speed of the hot water supply combustion fan 21, and the opening and closing of the hot water supply gas solenoid valves 18 and 19 are controlled in accordance with the amount.

When the user operates the automatic switch 61 of the remote controller 30, the controller 4 starts the above-mentioned automatic operation, and opens the pouring solenoid valve 52 first. By opening the pouring solenoid valve 52, water supply to the water supply pipe 7 is started,
The hot water supply burner 5 is ignited in the same manner as when the user opens the curran 26 described above, and the hot water supply pipe 11 is supplied with the hot water supply electromagnetic valve 52, the bath hot water supply pipe 53, the three-way valve 54, and the circulation path 4.
The hot water supply at the hot water supply target temperature is started via 3.

The controller 4 accumulates the amount of hot water supplied to the bathtub 42 based on the output from the flow rate sensor 56, and closes the pouring solenoid valve 52 when the accumulated value reaches the filling level.
The supply of a predetermined amount of hot water (hot water) to the bathtub 42 ends.

After completion of filling the bath tub 42, the controller 4 detects the temperature of the hot water in the bath tub 42 based on the output of the bath temperature sensor 45. If the detected temperature is lower than the boiling temperature, the boiling temperature Until the hot water in the bathtub 42 is heated.

In order to increase the temperature, the additional heating control means 32 provided in the controller 4 operates the bath pump 44 to circulate the hot water in the bathtub 42 through the circulation path 43 and to heat the bath combustion fan 49. The hot gas supply fan 21 and the hot water supply combustion fan 21 are operated to open the original gas solenoid valve 17 and the bath gas solenoid valve 47, and apply a high voltage to the bath ignition plug 50 via the igniter 23 to generate spark discharge. Forty ignition processes are performed.

When the additional heating control means 32 recognizes from the output of the bath frame rod 51 that the bath burner 40 has been ignited, the temperature detected by the bath temperature sensor 45 reaches the boiling temperature. Until the above, the combustion of the bath burner 40 is continued. As a result, the temperature of the hot water in the bathtub 42 is raised to the boiling temperature (additional heating).

Note that the additional heating control means 32 keeps the temperature of the hot water in the bathtub 42 substantially at the boiling temperature for four hours after the hot water in the bathtub 42 reaches the boiling temperature. Thus, the bath heat keeping operation of intermittently burning the bath burner 40 is performed. Then, during the bath heat keeping operation, the heat keeping mark 72 is displayed on the display section 69 of the remote controller 30.

When the user operates the automatic switch 61 of the remote controller 30 and recognizes from the output of the water level sensor 57 that the bathtub 42 is already filled with water, the controller 4 sets the bathtub. 42 is not filled, but only additional heating up to the above-mentioned boiling temperature is performed.

When the user operates the reservation operation switch 67, the reservation operation is set, and the reservation mark 71 is displayed on the display section 71 of the remote controller 30. The reservation setting switch 64, the hour switch 65, and the minute switch 6
The automatic operation described above is executed when the preset reservation time is reached in 6.

Next, when the user operates the heat retention switch 68, the hot water supply control means 31 sets the temperature of the hot water in the hot water supply heat exchanger 6 within a predetermined temperature range for a predetermined time (for example, one hour). Execute the heat retention control. This heat retention control is a process for reducing the time (delay time) from when the user opens the curan 26 to when the hot water is actually supplied to the curan 26.

As described above, the hot water supply burner 5 is ignited when the flowing water sensor 10 recognizes the start of supplying water to the heat exchanger 6. And at this time, hot water supply pipe 2
5, the water stays in the hot water supply pipe 11 and the heat exchanger 6. Therefore, the hot water is supplied from the curan 26 after the water staying in the hot water supply pipe 25, the hot water supply pipe 11, and the heat exchanger 6 is supplied. The length of the pipe in the hot water supply heat exchanger 6 is, for example, 2.5 m.

Therefore, by keeping the temperature of the hot water in the hot water supply heat exchanger 6 in advance, the amount of water to be supplied before the hot water supply is started can be reduced to only the amount of water retained in the hot water supply pipe 25 and the hot water supply pipe 11. The delay time from when the user opens the curran 26 to when the hot water supply is actually started can be reduced.

Hereinafter, the processing content of the heat retention control by the hot water supply control means 31 will be described in detail with reference to the flowcharts of FIGS.

Referring to FIG. 3, when the user operates the heat retention switch 68 in STEP1, the reception lamp 73 built in the heat retention switch 68 is turned on in STEP2. Then, hot water supply control means 31 executes STEP 3 subroutine A.

Although the details of the execution contents of the subroutine A will be described later, when the additional heating of the hot water in the bathtub 42 by the additional heating control means 32 is being executed, the hot water supply control means 31 continues until the additional heating is completed. It does not proceed thereafter and does not start the heat retention control.

As described above, when additional heating is performed and the bath burner 40 is burning, the hot water supply combustion fan 21 is also operated together with the bath combustion fan 49 to prevent the backflow of the combustion exhaust gas. In this case, since the outside air sucked from the intake port 84 by the hot water supply combustion fan 21 hits the hot water supply heat exchanger 6, especially when the outside air is at a low temperature, the temperature of the hot water retained in the hot water supply heat exchanger 6 rapidly decreases. I do.

Therefore, when the heat retention control is started in this state, the hot water supply burner 5 must be frequently burned in order to keep the hot water in the hot water supply heat exchanger 6 within the predetermined temperature range.
The consumption of fuel gas becomes large. Therefore, the hot water supply control means 4 stands by without starting the heat retention control when the additional heating is being performed, thereby preventing a large amount of fuel gas from being consumed by the heat retention control.

Subsequently, it is determined in STEP 4 whether or not 5 minutes have elapsed since the combustion of the hot water supply burner 5 was stopped. During the set time of 5 minutes, the temperature of the hot water in the hot water supply heat exchanger 6 becomes uniform after the combustion of the hot water supply burner 5 stops, and the temperature of the hot water in the hot water supply heat exchanger 6 and the heat exchange temperature sensor 15 Is the time that is assumed to be required to match.

Then, hot water supply control means 31 determines in STEP 5
Is determined based on the hot water temperature detected by the hot water temperature sensor 9 and the hot water target temperature set by the hot water temperature switch 62 of the remote controller 30. . In hot water supply apparatus 1 of the present embodiment, hot water supplied from hot water supply heat exchanger 6 via hot water supply pipe 11 and water supplied from water supply pipe 8 via bypass pipe 12 have hot water supply target temperatures. And supplied to the hot water supply pipe 25. Therefore, it is necessary to determine the warming start temperature of the hot water in the hot water supply heat exchanger 6 and a warming target temperature, which will be described later, according to both the hot water supply temperature and the hot water supply target temperature.

If the temperature of the hot water in the hot water supply heat exchanger 6 detected by the heat exchange temperature sensor 15 is equal to or higher than the heat retention start temperature in STEP 6, the process branches to STEP 21 to control the remote controller 3
In the display section 69 of 0, an OK mark 74 indicating that the hot water in the hot water supply heat exchanger 6 is maintained in the range from the heat retention start temperature to the heat retention target temperature is displayed. The hot water supply from the hot water supply heat exchanger 6 and the hot water supply from the bypass pipe 12 depend on the detection value of the supply water temperature by the supply water temperature sensor 53 and the detection value of the temperature of the hot water in the hot water supply heat exchanger 6 by the heat exchange temperature sensor 15. The temperature when the water supply is mixed is adjusted so as to match the hot water supply target temperature.

On the other hand, in STEP 6, the heat exchange temperature sensor 15
If the temperature of the hot water in the hot water supply heat exchanger 6 detected by the above is lower than the heat retention start temperature, the process proceeds to STEP 7 for the first time since the heat retention switch 73 is operated or the first time since the hot water supply control is stopped. If, STEP8
To clear the counter variable C. The function of the counter C will be described later.

At STEP 9, it is detected whether or not water exists in the hot water supply heat exchanger 6. In the present embodiment, the presence / absence of water is detected by using a thermistor for the heat exchange temperature sensor 15 and applying a high voltage to the thermistor to cause self-heating by applying a high voltage to the thermistor. The temperature decrease rate of the thermistor after the application of water is stopped depends on whether the thermistor is in water (there is water in the hot water supply heat exchanger 6) or in the air (there is no water in the hot water supply heat exchanger 6). This is done using different things.

If it is determined in STEP 9 that there is water in the hot water supply heat exchanger 6, STEP 10 to STEP 11
Then, the heat retention target temperature, which is the temperature at which the combustion of the hot water supply burner 5 is stopped, is determined according to the heat retention start temperature.

Then, in STEP 12, the combustion time T of the hot water supply burner 5 required to raise the temperature of the hot water in the hot water supply heat exchanger 6 from the heat retention start temperature to the heat retention target temperature is calculated. The calculation of the combustion time T is based on the hot water supply gas solenoid valve 1.
The opening of the hot water supply gas proportional valve 20 is performed based on the heating amount of the hot water supply burner 5 when the opening degree of the hot water supply gas proportional valve 20 is set to the minimum opening degree at which the hot water supply burner 5 can burn.

Next, in STEP 13, the hot water supply gas solenoid valve 1
8 and 19 are both opened, and the combustion of the hot water supply burner 5 is started in a state where the opening degree of the hot water supply gas proportional valve 20 is set to the minimum opening degree at which the combustion of the hot water supply burner 5 is possible. In this way, by burning the entire hot water supply burner 5 with the combustion amount being minimized, the temperature of the hot water in the hot water supply heat exchanger 6 is prevented from rising rapidly,
The variation in the temperature of the hot water in the hot water supply heat exchanger 6 is reduced, and the hot water supply burner 5 is prevented from frequently repeating combustion and stop of combustion.

Next, at STEP 14, a timer T for starting the combustion time T calculated at STEP 12 as a set time is started, and S
Wait for the timer T to expire at TEP15,
In step 16, the combustion of the hot water supply burner 5 is stopped, and
If the OK mark 74 is not displayed on the display section 69 in step 17, the OK mark 74 is displayed in step 18 and the ST
Return to EP4.

Thereafter, the processing of STEP4 to STEP18 is repeated, and when the temperature detected by the heat exchange temperature sensor 15 becomes lower than the heat retention start temperature in STEP6, STEP13 to STEPS
The hot water supply burner 5 is operated in TEP16. This allows
The temperature of the hot water in the hot water supply heat exchanger 6 is maintained within the range from the heat retention start temperature to the heat retention target temperature.

When the temperature detected by the heat exchange temperature sensor 15 is equal to or higher than the heat retention start temperature in STEP 6, it is not necessary to burn the hot water supply burner 5, so the process branches to STEP 21 and the OK mark 74 is displayed on the display section 69. And STEP2
In step 2, the opening degree of the bypass servo 13 is adjusted according to the temperatures detected by the heat exchange temperature sensor 15 and the feed water temperature sensor 9.

Next, the processing contents of the subroutine A will be described with reference to FIGS. In STEP 49 of FIG. 5, during the heat retention control, the reheating control means 32 causes the
It is confirmed whether or not the reheating of the hot water in the inside has been started. When the start of the reheating is confirmed, the process branches to STEP70 in FIG. In this step 49, the hot water supply combustion fan 21 operates in conjunction with the operation of the bath burner 40, and the hot water in the hot water supply heat exchanger 6 is cooled by the blowing from the hot water supply combustion fan 21 in the same manner as in the above-described processing in STEP 1. This is a process for prohibiting the execution of the heat retention control in the process.

If the hot water supply burner 5 is burning in STEP 70, the hot water supply control means 31 stops the combustion of the hot water supply burner 5 in STEP 71. Then, in STEP 72, S
The heat retention start temperature is determined in the same manner as in TEP5. The following S
In step 73, the temperature detected by the heat exchange temperature sensor 15 is set to STE.
If the temperature is equal to or higher than the heat retention start temperature determined in P72, ST
The process branches to the EP 80 to display an OK mark 74 on the display unit 69 of the remote controller 30. Then, the end of the additional heating is confirmed in STEP 81, or until the temperature detected by the heat exchange temperature sensor becomes lower than the heat retention start temperature in STEP 73, STEP 73,
The loop of 80 and 81 is repeatedly executed, during which the heat retention control is interrupted. Then, hot water supply control means 31
When it is confirmed at 81 that the reheating is stopped, the process proceeds to STEP 4 to restart the heat retention control.

On the other hand, if the temperature detected by the heat exchange temperature sensor is lower than the heat retention start temperature in STEP 73,
74 turns off the OK mark on the display section 69 of the remote controller 30
Then, STEP75 is repeatedly executed until the end of the additional heating is confirmed, and during this time, the heat retention control is interrupted. STEP7
When the end of the reheating is confirmed in step 5, as in step 81, the process proceeds to step 4 to restart the heat retention control.

Next, STEP 50 in FIG. 5 is a detection unit for detecting the OFF operation of the heat retention switch 68. When the user operates the heat retention switch 68 to OFF, the process branches to STEP 60, and when the hot water supply burner 5 is burning, STEP 64 is performed. To stop the combustion of the hot water supply burner 5. Then, in step 61, the display of the OK mark on the display unit 69 is turned off, and in step 62, the reception lamp 73 built in the heat insulation switch 68 is turned off, and the heat insulation control ends.

STEP 51 is an opening / closing detection section for the curan 26. When the user opens the curan 26 and detects water supply to the water supply pipe by the output of the water flow sensor 10, the hot water supply control means 31 returns to a standby state described later in STEP 65. The flag F is reset (F = 0), a one-hour timer described later is reset in STEP 66, and the hot water supply control described above is performed in STEP 67 until the stop of water supply is detected from the output of the water flow sensor 10 in STEP 68.

STEP 52 is a determination section for determining whether or not a standby flag F indicating that a one-hour timer described later has timed out is set (F = 1). If the standby flag F is set (F = 1) If it is, S
The process branches to TEP50 to execute a wait loop of STEP50 to STEP52.

STEP 53 is a one-hour timer activation judging section. This one-hour timer manages one hour, which is the execution time of the heat retention control. If the one-hour timer is not operating in STEP53, the one-hour timer is started in STEP54. That is, when the subroutine A is first executed after the heat switch 68 is operated, and when ST
Water supply is detected in EP51 and STEP65 to STEP6
When the subroutine A is first executed after the hot water supply operation of No. 7 is completed, the one-hour timer is started.

In the flowcharts of FIGS. 3 and 4, the subroutine A is sequentially executed in each waiting loop.
When the one-hour timer times out in step 5, ST
In EP56, the presence or absence of combustion of the hot water supply burner 5 is determined, and when the hot water supply burner 5 is burning, the combustion of the hot water supply burner 5 is stopped in STEP 67. Subsequently, in step 57, the standby flag F is set (F = 1), and in step 58, the display of the OK mark 74 on the display unit 69 is turned off to notify the user that the one-hour heat retention control has been completed.
Returning to step 50, a wait loop of STEP50 to STEP52 is executed.

Incidentally, STEP 24 in the flowchart of FIG.
Step 28 is a process for dealing with water leakage.
That is, when the tenth combustion of the hot water supply burner 5 becomes necessary before the one-hour timer expires, the temperature of the hot water in the hot water supply heat exchanger 6 rapidly drops, and the water is supplied to the hot water supply pipe 11 or the like. Since there is a leak point, the hot water supply heat exchanger 6
It is determined that water is being supplied to
The process branches to STEP26, prohibits the heat retention control, and proceeds to STEP27.
The display of the OK mark 74 on the display unit 69 is turned off.

In the present embodiment, a hot water supply device using a gas burner as hot water supply burner 5 and bath burner 40 has been described, but a hot water supply using a burner, such as a kerosene burner, whose combustion air is supplied by a combustion fan. The present invention can be applied to a device.

Although the example in which the hot water supply means 2 and the additional heating means 3 are arranged in the same housing 80 has been shown, in addition to the additional heating means 3, heating means for circulating hot water to the floor heating device, etc. The present invention is also applicable to a hot water supply apparatus in which other types of heating means and hot water supply means 2 are arranged in the same housing.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of a hot water supply device of the present invention.

FIG. 2 is an external view of a remote controller provided in the water heater shown in FIG.

FIG. 3 is an operation flowchart of the water heater shown in FIG. 1;

FIG. 4 is an operation flowchart of the water heater shown in FIG. 1;

FIG. 5 is an operation flowchart of the water heater shown in FIG. 1;

FIG. 6 is an operation flowchart of the water heater shown in FIG. 1;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Hot water supply apparatus, 2 ... Hot water supply means, 3 ... Additional heating means, 4 ... Controller, 5 ... Hot water supply burner, 6 ... Hot water supply heat exchanger, 7 ...
Water supply pipe, 8: water quantity servo, 9: water supply temperature sensor, 10 ...
Running water sensor, 11: hot water supply pipe, 12: bypass pipe, 13 ...
Bypass servo, 14 hot water supply temperature sensor, 15 heat exchange temperature sensor, 16 gas supply pipe, 17 original gas solenoid valve, 1
8, 19: hot water supply gas solenoid valve, 20: hot water supply gas proportional valve, 2
DESCRIPTION OF SYMBOLS 1 ... Hot-water supply combustion fan, 22 ... Hot-water supply ignition plug, 23 ... Igniter, 24 ... Hot-water supply frame rod, 25 ... Hot-water supply piping, 26 ... Karan, 27 ... Overpressure safety valve and drain valve, 30 ...
Remote controller, 31: Hot water supply control means, 32: Additional heating control means, 40: Bath burner, 41: Bath heat exchanger, 42: Bathtub, 43: Circulation path, 44: Circulation pump, 45: Bath temperature sensor, 46: Water flow Switch, 47 ... bath gas solenoid valve,
48: bath gas governor, 49: bath combustion fan, 50 ...
Bath ignition plug, 51: bath frame rod, 52: pouring solenoid valve, 53: bath water pipe, 54: three-way valve, 56: flow rate sensor, 57: water level sensor, 80: housing, 81: collective exhaust port, 84 … Inlet

Continuation of the front page (56) References JP-A-62-261857 (JP, A) JP-A-60-165460 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) F24H 1 / 10 302 F24H 1/46

Claims (2)

(57) [Claims] 1. A hot water supply heat exchanger for heating water supplied by a water supply pipe by a hot water supply burner, a fuel supply adjusting means for adjusting a fuel supply amount to the hot water supply burner, and supplying combustion air to the hot water supply burner. A hot water supply combustion fan, a hot water supply pipe from which hot water heated by the hot water supply heat exchanger is discharged, a hot water supply temperature sensor for detecting a temperature of hot water supplied from the hot water supply pipe, and a vicinity of an outlet of the hot water supply heat exchanger. Hot water supply means having a heat exchange temperature sensor for detecting the temperature of hot water, and a flowing water sensor for detecting the presence or absence of flowing water passing through the hot water supply heat exchanger; and other heated objects other than water supplied from the water supply pipe. A heating unit having a heating burner for heating an object, a heating combustion fan for supplying combustion air to the heating burner, the hot water supply unit and the heating unit are housed, and the combustion exhaust gas of the hot water supply burner; Burner burnout A housing having a collective exhaust port that collects and discharges the heat, a heating control that operates the heating burner under predetermined conditions, and operates both the heating combustion fan and the hot water supply combustion fan during operation of the heating burner. Heating control means for performing the combustion of the hot water supply burner so that the detected temperature of the hot water supply temperature sensor matches a predetermined hot water supply target temperature when flowing water is detected by the flowing water sensor. Hot water supply control to adjust the amount, and when running water is not detected by the running water sensor, when the temperature detected by the heat exchange temperature sensor is lower than a predetermined warming start temperature,
And a hot water supply control means for performing heat retention control for operating the hot water supply burner for a heating time determined according to a predetermined heat retention target temperature, wherein the hot water supply control means comprises: When the heating control is being executed, the execution of the heat retention control is prohibited. 2. The hot water supply control means controls the operation of the hot water supply burner when the heating control is started by the heating control means while the hot water supply burner is operating during the execution of the heat retention control. After stopping, suspending the heat retention control, resuming the heat retention control after the heating control is completed, and when the hot water supply burner is not operating during execution of the heat retention control, the heating control means The hot water supply apparatus according to claim 1, wherein when the heating control is started, the heat keeping control is immediately interrupted, and the heat keeping control is restarted after the heating control is finished.