JP2003090602A - Heating function equipped hot water supply apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent high temperature hot water from being discharged even in a hot water supply cock being opened when a bypass control valve provided on the side of water inflow of a hot water supply circuit for mixing water is in the failure. SOLUTION: There is provided control means for prohibiting heating combustion in the arrangement of a bypass control valve 8 controlled to a 'full open' position upon heating operation, when a 'full open' position signal of the bypass control valve 8 is not detected. Consequently, the heating for a hot water supply heat exchanger 7 is eliminated, and hence even in the failure of the bypass control valve 8 high temperature hot water from a hot water supply cock 1 is prevented from being discharged.

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 device with a heating function capable of supplying hot water and heating.

[0002]

2. Description of the Related Art A conventional water heater of this type has a structure as shown in FIG. That is, during the hot water supply operation in which the heat exchanger 7 for hot water supply is heated, when the hot water tap 1 is opened, the water quantity sensor 2 detects water flow, and then the combustion fan 3 rotates,
The gas source electromagnetic valve 4 and the gas proportional valve 5 are opened, the burner 6 is ignited, and heated by the hot water supply heat exchanger 7. Here, the hot water heated by the hot water supply heat exchanger 7 is mixed with the water on the incoming side by the bypass control valve 8 provided on the incoming side of the hot water supply circuit. The mixed hot water is supplied from the hot water tap 1 via the hot water supply connection port 11 by adjusting the opening degree of the control valve 8 by the signal of the hot water discharge thermistor 10 so as to reach the hot water set temperature set by the remote control remote control 9.

Next, during the heating operation, the heating water 14 of the heating terminal 13 is circulated by the circulation pump 12 into the heating return first passage 1.
5, when the circulation is detected by the flowing water detection unit 18 through the tank 16, the heating return second passage 17, the combustion fan 3 rotates, the gas source solenoid valve 4 and the gas proportional valve 5 are opened, and the burner 6 is opened. It ignites and is heated by the heat exchanger 19 for heating, and the heating passage 2
0, it is circulated to the heating terminal 13.

[0004]

However, in the hot water supply device with a heating function, which is one of the conventional heat exchangers, the heating heat exchanger 19 is heated and the hot water supply heat exchanger 7 is also heated during the heating operation. Therefore, when the hot water temperature in the hot water supply heat exchanger 7 becomes high and the bypass control valve 8 is closed, when the hot water tap 1 is opened, the hot water is discharged.

[0005]

In order to solve the above-mentioned problems, the present invention does not detect the "full open" position signal of the bypass control valve in a configuration in which the bypass control valve is controlled to the "fully open" position during heating operation. In this case, the control means for prohibiting heating and combustion is provided.

According to the above invention, when the "full open" position signal of the bypass control valve is not detected during the heating operation, the heating combustion is prohibited, so that the hot water heat exchanger is not heated and the hot water from the hot water tap is heated. It is possible to control so that hot water is not discharged.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The invention according to claim 1 of the present invention is
A hot-water supply heat exchanger and a heating heat exchanger are installed side by side, and a heat exchanger of the type that is heated by the same burner, hot water that is provided on the water inlet side of the hot water supply circuit, and hot water that is heated by the hot water exchanger Bypass control valve that mixes water and adjusts to the set temperature set by the external input device, the heating circuit in the heating circuit, which is provided downstream of the heat exchanger, and the return of heating in which circulating water from the heating terminal flows. A passage, a circulation pump that circulates water from the heating return passage to the heat exchanger, and a flowing water detector that detects water circulation by the circulation pump. The circulation pump circulates and the flowing water detector detects circulation. However, when the bypass control valve is controlled to the "fully open" position while the heat exchanger is being heated by the burner, if the "fully open" position signal of the bypass control valve is not detected, control means for prohibiting heating combustion is provided. Equipped with heating operation If the "full open" position signal of the bypass control valve is not detected, the heating and combustion is prohibited, so that the hot water heat exchanger is not heated and it is possible to control so that hot water is not discharged from the hot water tap. Have an effect.

According to a second aspect of the present invention, there is provided a heat exchanger for hot water supply and a heat exchanger for heating, and the heat exchanger is of a system of heating with the same burner, and the heat exchanger for hot water supply provided on the water inlet side of the hot water supply circuit. The hot water heated in, and the bypass control valve that mixes the water on the inlet side to adjust the set temperature set by the external input device, the heating circuit, the heating outflow passage provided downstream of the heat exchanger,
The circulation pump is equipped with a heating return passage through which circulating water from the heating terminal flows, a circulation pump for circulating water from the heating return passage to the heat exchanger, and a running water detection unit for detecting water circulation by the circulation pump. When the circulating water is detected by the flowing water detection unit and the burner is heating the heat exchanger, the bypass control valve is not detected in the "fully open" position signal when the bypass control valve is controlled to the "fully open" position. In this case, the control means for fixing the heating combustion amount to a predetermined combustion amount is provided, and if the "full open" position signal of the bypass control valve is not detected during heating operation, the heat exchanger for hot water supply falls below a predetermined temperature. Since the heating combustion amount is controlled to be fixed to a predetermined combustion amount as described above, there is an effect that it is possible to control so that high-temperature hot water is not discharged from the hot water tap.

According to a third aspect of the present invention, a heat exchanger for hot water supply and a heat exchanger for heating are provided side by side, and the heat exchanger is of a system of heating with the same burner; The hot water heated by the heater, the bypass control valve that mixes the water on the inlet side to adjust the set temperature set by the external input device, the heating circuit, the heating outflow passage provided downstream of the heat exchanger, A heating return passage through which circulating water from the heating terminal flows,
It is equipped with a circulation pump that circulates water from the heating return passage to the heat exchanger, and a water flow detection unit that detects water circulation by the circulation pump.The circulation pump circulates and the water flow detection unit detects circulation, and the burner is used. When the bypass control valve is controlled to the "fully open" position while heating the heat exchanger, if the "full open" position signal of the bypass control valve is not detected, the heat exchange temperature sensor provided downstream of the heat exchanger. Is provided with control means for varying the heating combustion amount to a predetermined value by the signal of
When the "full open" position signal of the bypass control valve is not detected during heating operation, the heating combustion amount is set to a predetermined value by the signal from the heat exchange temperature sensor downstream of the heat exchanger so that the hot water supply heat exchanger becomes below the predetermined temperature. Since the control is variably changed to, there is an effect that the hot water can be controlled so as not to be discharged from the hot water tap.

According to a fourth aspect of the present invention, a heat exchanger for hot water supply and a heat exchanger for heating are provided side by side, and the heat exchanger is of a system of heating with the same burner, and the heat exchange for hot water supply is provided on the water inlet side of the hot water supply circuit. The hot water heated by the heater, the bypass control valve that mixes the water on the inlet side to adjust the set temperature set by the external input device, the heating circuit, the heating outflow passage provided downstream of the heat exchanger, A heating return passage through which circulating water from the heating terminal flows,
It is equipped with a circulation pump that circulates water from the heating return passage to the heat exchanger, and a water flow detection unit that detects water circulation by the circulation pump.The circulation pump circulates and the water flow detection unit detects circulation, and the burner is used. When the bypass control valve is controlled to the “fully open” position while the heat exchanger is being heated, the heating means and the heating combustion are repeatedly stopped when the “fully open” position signal of the bypass control valve is not detected. When the bypass control valve "full open" position signal is not detected during heating operation, the control to stop heating combustion and restart heating combustion at a predetermined cycle, and the heat exchanger for hot water supply The signal from the heat exchanger temperature sensor downstream of the heat exchanger so that the temperature becomes equal to or lower than the temperature of the heat exchanger, control to stop heating combustion or start heating combustion again, or a heating circuit provided downstream of the heat exchanger in the heating circuit. The signal of the heating forward temperature sensor provided in the road, has the effect of heating combustion or stopped, for performing control to start the heating combustion again, can be controlled to the high-temperature hot water from the hot-water tap is not ejected.

According to a fifth aspect of the present invention, a heat exchanger for hot water supply and a heat exchanger for heating are provided side by side, and the heat exchanger is of a system of heating with the same burner; The hot water heated by the heater, the bypass control valve that mixes the water on the inlet side to adjust the set temperature set by the external input device, and the heating circuit, in the heating circuit, is provided with the heating outflow passage provided downstream of the heat exchanger. A heating return passage through which circulating water from the heating terminal flows,
It is equipped with a circulation pump that circulates water from the heating return passage to the heat exchanger, and a water flow detection unit that detects water circulation by the circulation pump.The circulation pump circulates and the water flow detection unit detects circulation, and the burner is used. When the bypass control valve is controlled to the "fully open" position when the heat exchanger is heated, if the "fully open" position signal of the bypass control valve is not detected, the circulation auxiliary valve provided in parallel with the bypass control valve is installed. It is equipped with a control means for opening, and when the "full open" position signal of the bypass control valve is not detected during heating operation, it is the same as the bypass control valve because it controls the opening of the circulation auxiliary valve provided in parallel with the bypass control valve. Since it plays a role, it has an effect that it is possible to control so that hot water is not discharged from the hot water tap.

According to a sixth aspect of the present invention, a heat exchanger for hot water supply and a heat exchanger for heating are provided side by side, and the heat exchanger is of a system of heating with the same burner, and the heat exchange for hot water supply is provided on the inlet side of the hot water supply circuit. The hot water heated by the heater, the bypass control valve that mixes the water on the inlet side to adjust the set temperature set by the external input device, the heating circuit, the heating outflow passage provided downstream of the heat exchanger, A heating return passage through which circulating water from the heating terminal flows,
It is equipped with a circulation pump that circulates water from the heating return passage to the heat exchanger, and a water flow detection unit that detects water circulation by the circulation pump.The circulation pump circulates and the water flow detection unit detects circulation, and the burner is used. A water channel for flowing water from the hot water supply circuit to the outside of the hot water supply circuit when the "full open" position signal of the bypass control valve is not detected in the configuration in which the bypass control valve is controlled to the "fully open" position while heating the heat exchanger. It is equipped with a control means for draining the water in the hot water supply circuit by means of the drain valve installed in the hot water supply circuit. The drain valve provided in the water passage controls the drainage of the water in the hot water supply circuit.Therefore, there is no water to be heated in the heat exchanger for hot water supply, and it is possible to control so that hot water is not discharged from the hot water tap. it can It has the effect of say.

According to a seventh aspect of the present invention, a heat exchanger for hot water supply and a heat exchanger for heating are provided side by side, and the heat exchanger is of a system of heating with the same burner, and the heat exchange for hot water supply is provided on the water inlet side of the hot water supply circuit. The hot water heated by the heater, the bypass control valve that mixes the water on the inlet side to adjust the set temperature set by the external input device, and the heating circuit, in the heating circuit, is provided with the heating outflow passage provided downstream of the heat exchanger. A heating return passage through which circulating water from the heating terminal flows,
It is equipped with a circulation pump that circulates water from the heating return passage to the heat exchanger, and a water flow detection unit that detects water circulation by the circulation pump.The circulation pump circulates and the water flow detection unit detects circulation, and the burner is used. When the bypass control valve is controlled to the "fully open" position when the heat exchanger is heated, if the "full open" position signal of the bypass control valve is not detected, it is externally input that the bypass control valve has failed. In order to perform control to display to the external input device that the bypass control valve has a failure, when the "full open" position signal of the bypass control valve is not detected during heating operation. The function of notifying the user of the failure state and urging the user to be alerted that hot water may come out of the hot water tap for a while after the hot water supply is started.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. The same parts as those in the conventional example will be described with the same reference numerals.

(Embodiment 1) FIG. 1 is a block diagram of a hot water supply / room heating apparatus according to Embodiment 1 of the present invention. In the figure, during hot water supply operation, when the hot water tap 1 is opened, the water amount sensor 2 detects water flow, then the combustion fan 3 rotates, the gas source solenoid valve 4 and the gas proportional valve 5 open, and the burner 6 is ignited. It is heated in the hot water supply heat exchanger 7. Here, the hot water heated by the hot water supply heat exchanger 7 is mixed with the water on the incoming side by the bypass control valve 8 provided on the incoming side of the hot water supply circuit. The opening of the bypass control valve 8 is adjusted by the signal of the hot water discharge thermistor 10 so that the mixed hot water reaches the hot water supply set temperature set by the remote control remote control 9, and the hot water is supplied from the hot water tap 1 via the hot water supply connection port 11. .

During the heating operation, the circulation pump 12 causes the heating water 14 of the heating terminal 13 to flow into the heating return first passage 15,
Flowing water detection unit 1 through tank 16 and heating return second passage 17
When the circulation is detected at 8, the combustion fan 3 rotates,
The gas source solenoid valve 4 and the gas proportional valve 5 are opened, the burner 6 is ignited, the heating heat exchanger 19 heats the heating passage 20,
It is circulated to the heating terminal 13.

Since the heat exchanger 7 for hot water supply and the heat exchanger 19 for heating are provided side by side and heated by the same burner 6, the heating heat exchanger 19 is heated and hot water is supplied during heating operation. The heat exchanger 7 for heating is heated and the hot water temperature in the heat exchanger 7 for hot water supply is high.

At this time, even if the hot water tap 1 is opened, the bypass control valve 8 is controlled to the "fully open" position, so that the hot water in the hot water supply heat exchanger 7 is mixed with the water on the incoming side to reach a high temperature. The hot water is controlled so as not to be discharged.

Here, when the "fully open" position signal of the bypass control valve 8 is not detected, the heating combustion stopping means 23 closes the gas source solenoid valve 4 and the gas proportional valve 5 to stop the heating combustion, so that hot water supply is performed. The heat exchanger 7 for heating is not heated to a high temperature, and it is possible to control so that hot water is not discharged from the hot water tap 1.

(Embodiment 2) FIG. 2 is a block diagram of a hot water supply / room heating apparatus according to Embodiment 2 of the present invention. In the figure, when the "fully open" position signal of the bypass control valve 8 is not detected during heating operation, the heating combustion amount fixing means 24 fixes the heating combustion amount to, for example, the minimum combustion amount, or in another example. In order to control the heating combustion amount such that the heat exchanger 7 for hot water supply has a predetermined temperature, for example, 60 ° C. or less, is fixed to the predetermined combustion amount by the gas proportional valve 5, high-temperature hot water is discharged from the hot water tap 1. It is possible to control not to do so.

(Embodiment 3) FIG. 3 is a block diagram of a hot water supply / room heating apparatus according to Embodiment 3 of the present invention. In the figure, when the "full open" position signal of the bypass control valve 8 is not detected during the heating operation, the heating combustion amount varying means 25 causes heat exchange so that the hot water supply heat exchanger 7 has a predetermined temperature, for example, 60 ° C. or less. Since the heating proportional to the gas proportional valve 5 is controlled by changing the heating combustion amount to a predetermined value by the signal from the hot water outlet temperature sensor 21, it is possible to control so that hot water is not discharged from the hot water tap 1.

(Embodiment 4) FIG. 4 shows the configuration of a hot water supply / room heating apparatus according to Embodiment 4 of the present invention. When the "full open" position signal of the bypass control valve 8 is not detected during heating operation, heating combustion is stopped / restarted. The combustion means 26 controls the heating combustion to be stopped and the heating combustion to be performed again in a predetermined cycle (for example, every 60 seconds), and the hot water supply heat exchanger 7 has a predetermined temperature or lower (for example, 60 ° C. or lower). In accordance with a signal from the heat exchange temperature sensor 21 downstream of the heat exchanger, for example, control is performed to stop heating combustion at 60 ° C. or higher and restart heating combustion at 50 ° C. or lower, or the heat exchanger in the heating circuit. For example, the heating combustion temperature sensor 22 provided in the heating upstream passage provided at the downstream of the
It is possible to control so that high-temperature hot water is not discharged from the hot water tap 1 by stopping the heating combustion or performing the heating combustion again, such as the control of starting the heating combustion again at a temperature equal to or lower than 0 ° C.

(Embodiment 5) FIG. 5 is a block diagram of a hot water supply / room heating apparatus according to Embodiment 5 of the present invention. When the "full open" position signal of the bypass control valve 8 is not detected during heating operation, the circulation auxiliary valve control is performed. Since the means 27 controls the circulation auxiliary valve 28 provided in parallel with the bypass control valve 8, the circulation auxiliary valve 28 is controlled to the "fully open" position even when the hot water tap 1 is opened at this time. The hot water in the hot water heat exchanger 7 is controlled so that the hot water is not mixed with the water on the inlet side and the hot water is not discharged, and the bypass control valve 8 plays the same role as in the normal state, so that the hot water tap 1 Therefore, it is possible to control so that hot water is not discharged.

(Sixth Embodiment) FIG. 6 is a block diagram of a hot water supply / room heating apparatus according to a sixth embodiment of the present invention. When the "full open" position signal of the bypass control valve 8 is not detected during heating operation, the drain valve control means is provided. The water inside the hot water supply circuit is controlled by, for example, opening a drain valve 31 provided in a water passage 30 for flowing water from the hot water supply circuit to the outside of the hot water supply circuit or switching to a direction for forming a passage connecting the hot water supply circuit and the outside of the hot water supply circuit. It is possible to perform control so that the water is drained to the outside of the hot water supply circuit, and there is no water to be heated in the hot water supply heat exchanger, so that hot water cannot be discharged from the hot water tap 1.

(Embodiment 7) FIG. 7 is a block diagram of a hot water supply / room heating apparatus according to a seventh embodiment of the present invention. When the "full open" position signal of the bypass control valve 8 is not detected during heating operation, failure display control means is provided. 32, the fact that the bypass control valve 8 is out of order is displayed on the remote control remote control 9 (for example, 6
(Display 61) is performed to inform the user of the failure state, and it can be urged as a caution that hot water may come out of the hot water tap 1 for a while after the start of hot water use.

[0026]

As described above, according to the present invention, when the "full open" position signal of the bypass control valve is not detected during heating operation, heating combustion is prohibited or the heat exchanger for hot water supply has a predetermined temperature. The gas proportional valve is equipped with control means for adjusting the heating combustion amount and stopping combustion as shown below, and at the same time, the remote control for remote control displays the failure of the bypass control valve. Even in the case of a failure, the effect of preventing the hot water from being discharged from the hot water tap and notifying the user of the abnormality and alerting the user can be obtained.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a hot water supply device with a heating function according to a first embodiment of the present invention.

FIG. 2 is a configuration diagram showing a hot water supply device with a heating function according to a second embodiment of the present invention.

FIG. 3 is a configuration diagram showing a hot water supply device with a heating function according to a third embodiment of the present invention.

FIG. 4 is a configuration diagram showing a hot water supply / baking apparatus with a heating function according to a fourth embodiment of the present invention.

FIG. 5 is a configuration diagram showing a hot water supply device with a heating function according to a fifth embodiment of the present invention.

FIG. 6 is a configuration diagram showing a hot water supply device with a heating function according to a sixth embodiment of the present invention.

FIG. 7 is a configuration diagram showing a hot water supply device with a heating function according to a seventh embodiment of the present invention.

FIG. 8 is a configuration diagram showing a conventional hot water supply device with a heating function.

[Explanation of symbols]

6 burners 7 Hot water heat exchanger 8 Bypass control valve 10 Hot water temperature sensor 12 Circulation pump 15 heating return first passage 17 Heating return second passage 18 Running water detector 19 Heating heat exchanger 20 Heating passage 21 Heat exchanger hot water temperature sensor 28 Circulation auxiliary valve 31 drain valve

   ─────────────────────────────────────────────────── ─── Continued front page    F term (reference) 3L024 CC19 DD04 DD13 DD22 DD27                       GG04 GG05 GG28 HH14                 3L070 BB03 BC03 BC14 BC22 CC02                       DE06 DF13 DG06

Claims (7)

[Claims] 1. A heat exchanger of a type in which a hot water heat exchanger and a heating heat exchanger are provided side by side and heated by the same burner, and hot water heated by the hot water heat exchanger provided on the water inlet side of the hot water supply circuit. When,
Bypass control valve that mixes the water on the incoming side and adjusts it to the set temperature set by the external input device, the heating outward passage provided on the downstream side of the heat exchanger of the heating circuit, and the circulating water from the heating terminal A heating return passage, a circulation pump that circulates water from the heating return passage to the heat exchanger, and a running water detection unit that detects water circulation by the circulation pump, and the circulation pump circulates. When the flowing water detection unit detects circulation, and the heat exchanger is heating with the burner,
A hot water supply apparatus with a heating function, comprising control means for prohibiting heating and combustion when the bypass control valve is controlled to a "fully open" position and a "fully open" position signal of the bypass control valve is not detected. 2. A heat exchanger of the type in which a hot water heat exchanger and a heating heat exchanger are provided side by side and heated by the same burner, and hot water provided on the water inlet side of the hot water supply circuit and heated by the hot water heat exchanger. When,
Bypass control valve that mixes the water on the incoming side and adjusts it to the set temperature set by the external input device, the heating outward passage provided on the downstream side of the heat exchanger of the heating circuit, and the circulating water from the heating terminal A heating return passage, a circulation pump that circulates water from the heating return passage to the heat exchanger, and a running water detection unit that detects water circulation by the circulation pump, and the circulation pump circulates. When the flowing water detection unit detects circulation, and the heat exchanger is heating with the burner,
A hot water supply apparatus with a heating function, which is provided with a control means for fixing the heating combustion amount to a predetermined combustion amount when the bypass control valve is controlled to the "fully open" position and the "full open" position signal of the bypass control valve is not detected. 3. A heat exchanger of a type in which a hot water heat exchanger and a heating heat exchanger are provided side by side and heated by the same burner, and hot water heated by the hot water heat exchanger provided on the water inlet side of the hot water supply circuit. When,
Bypass control valve that mixes the water on the incoming side and adjusts it to the set temperature set by the external input device, the heating outward passage provided on the downstream side of the heat exchanger of the heating circuit, and the circulating water from the heating terminal A heating return passage, a circulation pump that circulates water from the heating return passage to the heat exchanger, and a running water detection unit that detects water circulation by the circulation pump, and the circulation pump circulates. When the flowing water detection unit detects circulation, and the heat exchanger is heating with the burner,
When the bypass control valve is controlled to the “fully open” position and the “fully open” position signal of the bypass control valve is not detected, the heating combustion amount is set to a predetermined value by the signal of the heat exchange temperature sensor provided downstream of the heat exchanger. A hot water supply device with a heating function equipped with a control means that can be changed to a value. 4. A heat exchanger of a type in which a hot water heat exchanger and a heating heat exchanger are provided side by side and heated by the same burner, and hot water heated by the hot water heat exchanger provided on the water inlet side of the hot water supply circuit. When,
Bypass control valve that mixes the water on the incoming side and adjusts it to the set temperature set by the external input device, the heating outward passage provided on the downstream side of the heat exchanger of the heating circuit, and the circulating water from the heating terminal A heating return passage, a circulation pump that circulates water from the heating return passage to the heat exchanger, and a running water detection unit that detects water circulation by the circulation pump, and the circulation pump circulates. When the flowing water detection unit detects circulation, and the heat exchanger is heating with the burner,
A hot water supply apparatus with a heating function, comprising control means for repeating heating and combustion and stopping heating and combustion when the bypass control valve is controlled to a "fully open" position and a "fully open" position signal of the bypass control valve is not detected. 5. A heat exchanger of a type in which a hot water heat exchanger and a heating heat exchanger are provided side by side and heated by the same burner, and hot water heated by the hot water heat exchanger provided on the water inlet side of the hot water supply circuit. When,
Bypass control valve that mixes the water on the incoming side and adjusts it to the set temperature set by the external input device, the heating outward passage provided on the downstream side of the heat exchanger of the heating circuit, and the circulating water from the heating terminal A heating return passage, a circulation pump that circulates water from the heating return passage to the heat exchanger, and a running water detection unit that detects water circulation by the circulation pump, and the circulation pump circulates. When the flowing water detection unit detects circulation, and the heat exchanger is heating with the burner,
When the bypass control valve is controlled to the “full open” position and the “full open” position signal of the bypass control valve is not detected, a heating function having a control means for opening a circulation auxiliary valve provided in parallel with the bypass control valve is provided. Water heater. 6. A heat exchanger of a type in which a hot water heat exchanger and a heating heat exchanger are provided side by side and heated by the same burner, and hot water heated by the hot water heat exchanger provided on the water inlet side of the hot water supply circuit. When,
Bypass control valve that mixes the water on the incoming side and adjusts it to the set temperature set by the external input device, the heating outward passage provided on the downstream side of the heat exchanger of the heating circuit, and the circulating water from the heating terminal A heating return passage, a circulation pump that circulates water from the heating return passage to the heat exchanger, and a running water detection unit that detects water circulation by the circulation pump, and the circulation pump circulates. When the flowing water detection unit detects circulation, and the heat exchanger is heating with the burner,
When the bypass control valve is controlled to the “fully open” position and the “fully open” position signal of the bypass control valve is not detected, the drain valve provided in the water passage for flowing water from the hot water supply circuit to the outside of the hot water supply circuit causes A hot water supply device with a heating function equipped with a control means for draining the water. 7. A heat exchanger of a type in which a hot water heat exchanger and a heating heat exchanger are installed together and heated by the same burner, and hot water heated by the hot water heat exchanger provided on the water inlet side of the hot water supply circuit. When,
Bypass control valve that mixes the water on the incoming side and adjusts it to the set temperature set by the external input device, the heating outward passage provided on the downstream side of the heat exchanger of the heating circuit, and the circulating water from the heating terminal A heating return passage, a circulation pump that circulates water from the heating return passage to the heat exchanger, and a running water detection unit that detects water circulation by the circulation pump, and the circulation pump circulates. When the flowing water detection unit detects circulation, and the heat exchanger is heating with the burner,
When the bypass control valve is controlled to the "fully open" position and the "full open" position signal of the bypass control valve is not detected, heating having a control that indicates to the external input device that the bypass control valve has failed Hot water supply device with functions.