JP5589876B2 - Hot water storage water heater - Google Patents

Description

  The present invention relates to a hot water storage type hot water supply apparatus.

  A hot water storage type hot water supply apparatus that stores hot water generated by the heating means in a hot water storage tank and takes out the hot water from the hot water storage tank when necessary is widely used. This hot water storage type hot water supply device has an electronically controlled mixing valve that mixes hot water supplied from a hot water storage tank with cold water supplied from a water source such as a water supply through a water supply pipe and supplies it to a faucet (including a shower). I have. The opening degree of the mixing valve (mixing ratio of hot water and cold water) is electrically controlled so that the temperature of hot water supplied to the faucet matches the temperature set by the user.

  In Patent Document 1, when a hot hot water abnormality that causes the temperature of hot water supplied to the faucet to be higher than a set temperature has occurred, the abnormality of the mixing valve is the cause, or hot water heated by sunlight is supplied. A technique for discriminating whether an abnormality is caused by being supplied to a pipe is disclosed.

JP 2006-200787 A

  Even when there is no abnormality in the mixing valve and the hot water heated by sunlight is not supplied to the water supply pipe, a high temperature hot water supply abnormality may occur. This is the case where water supply from the water supply pipe is stopped due to reasons such as regional water shutoff or a water stop cock dedicated to the water supply pipe being closed. A water supply pipe is connected to the lower part of the hot water storage tank, and the water pressure of the water source acts in the hot water storage tank. Under normal conditions, when the faucet is opened, hot water is sent from the upper part of the hot water storage tank to the mixing valve by the water pressure. However, when water supply from the water supply pipe is stopped, the water pressure of the water source does not act on the hot water storage tank, so when the faucet is opened, the hot water in the hot water storage tank is connected to the lower part of the hot water storage tank due to the siphon effect. It flows back to the supplied water supply pipe, flows through the water supply side of the mixing valve to the faucet, and may cause abnormal hot water discharge. In the conventional apparatus, when such a high temperature hot water abnormality due to the stoppage of water supply occurs, there is a problem that the mixing valve is erroneously detected as being abnormal.

  The present invention has been made to solve the above-described problems, and can determine whether the high-temperature hot water abnormality is caused by the abnormality of the mixing valve or the stop of water supply. An object is to provide a hot water storage type hot water supply apparatus.

A hot water storage type hot water supply apparatus according to the present invention is supplied from a heating means for generating hot water, a hot water storage tank for storing hot water generated by the heating means, a water supply pipe for supplying cold water from a water source to the hot water storage tank, and a hot water storage tank. A faucet side mixing valve for generating hot water by mixing hot water and cold water supplied from a water supply pipe, the hot water supplied to the faucet, a faucet side temperature detecting means for detecting the temperature of the hot water flowing to the faucet, and a faucet A mixing valve opening control means for controlling the opening of the faucet side mixing valve so that the faucet side hot water temperature detected by the side temperature detecting means matches the faucet side set temperature set by the user, and the faucet side hot water supply Abnormality detection means that detects the occurrence of high temperature hot water abnormality that is abnormally high compared to the set temperature on the faucet side, and when the abnormality detection means detects the occurrence of high temperature hot water abnormality, the abnormality of the faucet side mixing valve Due to Or generates an abnormal cause discriminating means for determining whether due to water not not water from the water supply pipe, hot water obtained by mixing a cold water supplied from the water supply pipe and hot water supplied from the hot water storage tank,該湯water bath A bath-side mixing valve, a bath-side on-off valve that opens and closes the bath-side hot water supply passage from the bath-side mixing valve to the bathtub, and a bath-side water flow detection means that detects the water flow in the bath-side hot water supply passage. The abnormality cause determination means performs an abnormality cause determination process for confirming a detection result of the bath-side water flow detection means after issuing a command to open the bath-side on / off valve. In the abnormality cause determination process, the bath-side water flow detection means When the water flow is detected, it is determined that the faucet side mixing valve is abnormal, and when the water flow is not detected by the bath-side water flow detection means, it is determined that water supply is impossible .
The hot water storage type hot water supply apparatus according to the present invention includes a heating means for generating hot water, a hot water storage tank for storing hot water generated by the heating means, a water supply pipe for supplying cold water from a water source to the hot water storage tank, and a hot water storage tank. A faucet side mixing valve that generates hot water by mixing the supplied hot water and cold water supplied from a water supply pipe, the hot water supplied to the faucet, and a faucet side temperature detecting means for detecting the temperature of the hot water flowing to the faucet; A mixing valve opening control means for controlling the opening of the faucet side mixing valve so that the faucet side hot water temperature detected by the faucet side temperature detecting means matches the faucet side set temperature set by the user, and a faucet An abnormality detection means for detecting the occurrence of a high temperature hot water discharge abnormality in which the side hot water supply temperature is abnormally higher than the set temperature on the faucet side, and a faucet side mixing valve when the occurrence of a high temperature hot water discharge abnormality is detected by the abnormality detection means Abnormally Cause determination means for determining whether or not the water supply pipe is not supplying water, and a cold water side full open detection means for detecting whether the opening of the faucet side mixing valve is fully open to the cold water side And the abnormality cause determining means is configured such that when the abnormality detecting means detects the occurrence of high temperature hot water abnormality, if the opening of the faucet side mixing valve is fully open to the cold water side, It is determined that there is a possibility, and if the opening of the faucet side mixing valve is not fully open to the cold water side, it is determined that the faucet side mixing valve is abnormal.

  According to the present invention, it is possible to prevent erroneous detection that the faucet side mixing valve is abnormal when a high temperature hot water discharge abnormality of the faucet occurs due to the inability to supply water instead of an abnormality of the faucet side mixing valve. it can.

It is a block diagram which shows the hot water storage type hot water supply apparatus of Embodiment 1 of this invention. It is a block diagram which shows the control circuit structure of the hot water storage type hot-water supply apparatus shown in FIG. It is a flowchart of the control operation | movement which the control part of the hot water storage type hot-water supply apparatus shown in FIG. 1 performs. It is a flowchart of the control operation | movement which the control part of the hot water storage type hot-water supply apparatus shown in FIG. 1 performs.

  Embodiments of the present invention will be described below with reference to the drawings. In addition, the same code | symbol is attached | subjected to the element which is common in each figure, and the overlapping description is abbreviate | omitted.

Embodiment 1 FIG.
FIG. 1 is a configuration diagram illustrating a hot water storage type hot water supply apparatus according to Embodiment 1 of the present invention. The hot water storage type hot water supply apparatus of the present embodiment shown in FIG. 1 includes a hot water storage unit A having a hot water storage tank 4 and a heat pump type heat source unit B. The hot water storage tank 4 is always maintained in a full state, and when hot water and cold water coexist, hot water can be stored on the upper layer side and cold water can be stored on the lower layer side.

  In addition to the hot water storage tank 4, the hot water storage unit A is provided with a faucet side electric hot water mixing valve 6e, a bath side electric hot water mixing valve 6f, and the like. Cold water from a water source such as tap water is supplied to the hot water storage unit A through the pressure reducing valve primary side water supply pipe 2a. The pressure reducing valve primary-side water supply pipe 2a is provided with a stop cock 1 dedicated to the water supply pipe for adjusting the amount of cold water supplied from the water source. The cold water supplied from the pressure reducing valve primary side water supply pipe 2 a is decompressed to a predetermined pressure by the pressure reducing valve 3. The cold water decompressed by the pressure reducing valve 3 is supplied to the lower part of the hot water storage tank 4 through the hot water storage tank water supply pipe 2b, or the faucet side electric hot water mixing valve 6e and the bath through the pressure reducing valve secondary side water supply pipe 2d. It is supplied to the side electric hot / cold water mixing valve 6f.

  During the boiling operation of the hot water storage tank 4, the cold water in the hot water storage tank 4 is taken out from the lower part, sent to the heat source unit B, and heated. The boiled hot water returns to the hot water storage unit A and flows into the hot water storage tank 4 from above. The heating means in the present invention is not limited to the heat pump type heat source unit B as shown in FIG. 1, but may be, for example, an electric heater type or a type of boiling water using exhaust heat of a fuel cell. Good. A heating means may be installed in the hot water storage unit A.

  A relief valve 5 that opens at a predetermined pressure is connected to the upper part of the hot water storage tank 4. During the boiling operation of the hot water storage tank 4, the cold water in the hot water storage tank 4 is heated to cause volume expansion, and the internal pressure of the hot water storage tank 4 increases. Then, the relief valve 5 is opened, and an amount of hot water corresponding to the volume expansion is drained out of the hot water storage unit A. Thereby, the excessive rise of the internal pressure of the hot water storage tank 4 can be prevented. In addition, when the internal pressure of the hot water storage tank 4 decreases due to a cause described later, the relief valve 5 is opened to suck in outside air.

  The hot water stored in the hot water storage tank 4 is supplied to the faucet side electric hot water mixing valve 6e and the bath side electric hot water mixing valve 6f through the hot water storage tank hot water supply pipe 2c. The faucet side electric hot / cold water mixing valve 6e is connected to the faucet 10 via the faucet side mixed hot water supply pipe 2e. The bath side electric hot / cold water mixing valve 6f is connected to the bathtub 11 via the bath side mixed hot water supply pipe 2f. In the bath-side mixed hot water supply pipe 2 f, an electromagnetic valve 7 is installed as a bath-side on-off valve that opens and closes depending on whether there is a hot water supply request to the bathtub 11.

  The faucet 10 is provided, for example, in a wash basin, a sink, a shower or the like. The faucet 10 only needs to be able to adjust the amount of hot water, and may be configured to be installed in parallel. The faucet 10 may have a configuration in which hot water supplied from the faucet-side electric hot / cold water mixing valve 6e is further mixed with water from a water source and discharged.

  The hot water storage unit A is further provided with a control unit 9 that controls the entire hot water storage type hot water supply apparatus. The control unit 9 includes a heat source unit B, a faucet side electric hot / cold water mixing valve 6e, a bath side electric hot water / water mixing valve 6f, an electromagnetic valve 7, and a faucet side flow sensor 12e for detecting the water flow in the faucet side mixed hot water supply pipe 2e, A bath-side flow rate sensor 12f for detecting the water flow in the bath-side mixed hot water supply pipe 2f, a tap-side temperature sensor 13e for detecting the temperature of hot water flowing through the tap-side mixed hot water supply piping 2e, and the temperature of hot water flowing through the bath-side mixed hot water supply piping 2f. Sensors such as a bathside temperature sensor 13f to be detected, a feed water temperature sensor 13a used for boiling control and hot water temperature control, a hot water storage tank hot water temperature sensor 13c used for hot water temperature control and the like are electrically connected.

  The control unit 9 can communicate with the operation unit 8 by wire or wireless. The user can perform various settings such as a hot water supply temperature by the operation unit 8. A plurality of operation units 8 may be installed in a kitchen or bathroom. The control unit 9 controls the entire hot water storage type hot water supply apparatus based on the contents set by the user through the operation unit 8. For example, when the faucet 10 is opened, the control unit 9 controls the faucet side electric motor so that the faucet side hot water supply temperature detected by the faucet side temperature sensor 13e matches the faucet side set temperature set by the user. The opening degree (mixing ratio of hot water and cold water) of the hot water mixing valve 6e is controlled. In addition, when filling the bathtub 11, the control unit 9 controls the opening degree of the bath-side electric hot / cold water mixing valve 6 f according to the filling temperature set by the user. Further, during the boiling operation of the hot water storage tank 4, the control unit 9 instructs the heat source unit B to boil up. In addition, the control circuit block diagram of this hot water storage type hot water supply apparatus is shown in FIG.

  Usually, in the hot water storage tank 4, the water pressure of the water source reduced to a predetermined pressure by the pressure reducing valve 3 acts from the hot water storage tank water supply pipe 2b. When the faucet 10 is opened, hot water is sent from the upper part of the hot water storage tank 4 to the hot water storage tank hot water supply pipe 2c by this water pressure, and is supplied to the faucet side electric hot water mixing valve 6e. However, in a state where water is not supplied from the pressure reducing valve primary side water supply pipe 2a due to the water source being cut off or the water supply pipe stop cock 1 being closed, etc. (hereinafter referred to as “no water supply”), When the faucet 10 is opened, the following phenomenon occurs.

  When water supply is not possible, the water pressure from the water source does not act on the hot water storage tank 4, so the hot water in the hot water storage tank 4 is not sent to the hot water storage tank hot water supply pipe 2c. When the faucet 10 is opened in this state, the hot water remaining in the faucet side mixed hot water supply pipe 2e is discharged, and the hot water in the hot water storage tank 4 flows back to the hot water tank water supply pipe 2b due to the siphon effect. The hot water is discharged from the faucet 10 through the cold water side of the pressure reducing valve secondary side water supply pipe 2d and the faucet side electric hot water mixing valve 6e. At this time, air is sucked in from the negative pressure operating part of the relief valve 5, and this air flows into the upper part of the hot water storage tank 4.

  As described above, when the faucet 10 is opened when water supply is not possible, hot water in the hot water storage tank 4 is discharged from the faucet 10 through the cold water side of the faucet side electric hot water mixing valve 6e. For this reason, a state in which the temperature of the hot water discharged from the tap 10 becomes abnormally higher than the set temperature on the side of the tap (hereinafter referred to as “high temperature hot water discharge abnormality”) may occur. The high temperature hot water abnormality thus generated is not caused by an abnormality (failure) of the faucet side electric hot water mixing valve 6e. Therefore, if it is detected as an abnormality of the faucet side electric hot water mixing valve 6e, a false detection occurs.

  In order to prevent the above-described erroneous detection, this hot water storage type hot water supply device is caused by an abnormality of the faucet side electric hot water mixing valve 6e when a high temperature hot water discharge abnormality occurs or due to an inability to supply water. It has the function to discriminate. FIG. 3 and FIG. 4 are flowcharts of control operations executed by the control unit 9 in order to detect a high temperature hot water abnormality and determine the cause. Hereinafter, description will be given with reference to this flowchart.

  In step S1 of FIG. 3, the presence or absence of hot water supply to the faucet 10 is determined. This determination is made based on whether or not the faucet side flow rate sensor 12e has detected a water flow. If the faucet-side flow sensor 12e has not detected a water flow, the process returns to START in the flowchart, and the determination in step S1 is repeated.

  On the other hand, when the faucet side flow sensor 12e detects a water flow, the process proceeds to step S2 and starts measuring the faucet side hot water supply time. Next, it transfers to step S3 and correct | amends the opening degree of the faucet side electric hot water mixing valve 6e. Here, the opening degree of the faucet-side electric hot / cold water mixing valve 6e is corrected based on the temperature difference between the faucet-side hot water supply temperature detected by the faucet-side temperature sensor 13e and the faucet-side set temperature set by the user via the operation unit 8. Is done. That is, when the detected faucet side hot water supply temperature is higher than the faucet side set temperature, the opening degree on the cold water side is increased to increase the mixing ratio on the cold water side. On the contrary, when the detected faucet side hot water supply temperature is lower than the faucet side set temperature, the hot water side opening degree is increased in order to increase the hot water side mixing ratio.

  Subsequently, the process proceeds to step S4, and it is determined whether or not the faucet side hot water supply time started in step S2 has reached a predetermined high temperature determination standby time. If the faucet side hot water supply time has not reached the high temperature determination standby time, the process returns to step S3. When the faucet side hot water supply time has reached the high temperature determination standby time, the process proceeds to step S5, and the high temperature determination of the faucet side hot water supply temperature is performed.

  In step S5, it is determined whether or not the faucet side hot water supply temperature detected by the faucet side temperature sensor 13e is equal to or higher than a high temperature determination threshold value set according to the faucet side set temperature. The high temperature determination threshold is, for example, a temperature that is higher than the faucet side set temperature by a predetermined allowable width. When the detected faucet side hot water supply temperature is less than the high temperature determination threshold, it is determined that the faucet side hot water supply temperature is in the normal range. In this case, the process returns to step S3. On the other hand, when the detected faucet side hot water supply temperature is equal to or higher than the high temperature determination threshold, it is determined that the faucet side hot water supply temperature is higher than the normal range. In this case, the process proceeds to step S6, and the elapse of the high temperature determination time is determined.

  In step S6, it is determined whether or not the state in which the faucet side hot water supply temperature is equal to or higher than the high temperature determination threshold is continued for a predetermined high temperature determination time. In this step S6, when the duration of the state where the faucet side hot water supply temperature is equal to or higher than the high temperature determination threshold value has not reached the high temperature determination time, the faucet side hot water supply temperature may not have yet converged, Since it cannot be determined that the hot hot water is abnormal, the process returns to step S3. On the other hand, when the duration of the state in which the faucet side hot water supply temperature is equal to or higher than the high temperature determination threshold reaches the high temperature determination time, it can be reliably determined that there is a high temperature hot water supply abnormality. In this case, it is determined that there is an abnormality in high-temperature hot water, and the process proceeds to step S7.

  When a high temperature hot water abnormality occurs due to the inability to supply water, at this time, the opening degree of the faucet side electric hot water mixing valve 6e is fully open to the cold water side (a state in which the mixing ratio on the cold water side is maximized). It is thought that. As described above, when the faucet 10 is opened when water supply is not possible, the hot water in the hot water storage tank 4 passes through the hot water storage tank water supply pipe 2b and the pressure reducing valve secondary side water supply pipe 2d. 6e is supplied to the cold water side. For this reason, in the opening correction process of the faucet-side electric hot / cold water mixing valve 6e in step S3, if the correction is made in the direction of increasing the cold water-side opening in order to lower the faucet-side hot water supply temperature, the faucet-side hot water supply temperature rises conversely. To do. Therefore, by repeatedly executing step S3, the faucet-side electric hot / cold water mixing valve 6e continues to be corrected in the direction of increasing the opening degree on the cold water side, and therefore reaches the fully open state on the cold water side.

  Conversely, if the opening of the faucet-side electric hot / cold water mixing valve 6e is not fully open to the cold water when it is determined that a high temperature hot water abnormality has occurred, there is no possibility that the cause of the high temperature hot water abnormality is the inability to supply water. Therefore, it can be determined that the cause of the high temperature hot water supply abnormality is the abnormality of the faucet side electric hot water mixing valve 6e.

  The faucet side electric hot / cold water mixing valve 6e can detect a state in which the opening degree is fully open to the cold water side (hereinafter referred to as "origin"). The origin can be detected by, for example, the rotation angle of a step motor that changes the opening of the faucet-side electric hot / cold water mixing valve 6e. In step S7, it is determined whether or not the faucet-side electric hot / cold water mixing valve 6e has detected the origin until the correction amount by the correction process in step S3 exceeds a predetermined threshold. If the faucet-side electric hot / cold water mixing valve 6e has not detected the origin, it can be reliably determined that the cause of the high-temperature hot water supply abnormality is not water supply impossible but the faucet-side electric hot / cold water mixing valve 6e is abnormal for the reasons described above. Therefore, in this case, the process proceeds to step S9, and it is determined that the faucet side electric hot / cold water mixing valve 6e is abnormal. Furthermore, it transfers to step S11, alert | reports that the faucet side electric hot / cold water mixing valve 6e is abnormal (failure) by the operation part 8, and complete | finishes a process here. This notification can prompt the user to respond to a repair request or the like. Moreover, in step S11, in order to call a user's attention with respect to high temperature hot-water supply abnormality, you may alert | report together that it is high-temperature hot-water supply abnormality.

  On the other hand, if the faucet-side electric hot / cold water mixing valve 6e detects the origin in step S7, there is a possibility that water supply is not possible due to the above-mentioned reason, but the faucet-side electric hot / cold water mixing valve 6e may be abnormal. There is also sex. In this case, the process proceeds to step S8, where it is determined that there is a possibility that water supply is not possible or there is a suspicion of abnormality in the faucet side electric hot / cold water mixing valve 6e. Furthermore, the process proceeds to step S10, and the operation unit 8 notifies that there is a suspicion of an abnormality in the hot-water hot water mixing valve 6e and an abnormality in the faucet side electric hot water mixing valve 6e in order to alert the user. In this case, the abnormality cause determination process shown in the flowchart of FIG. 4 is subsequently performed in order to reliably determine whether water supply is not possible or whether the faucet side electric hot / cold water mixing valve 6e is abnormal.

  First, in step S12 of FIG. 4, the open / close state of the electromagnetic valve 7 is confirmed. When the solenoid valve 7 is open, it can be determined that the water supply impossibility determination process has already been performed when hot water is supplied to the bathtub 11, and thus it is not necessary to perform the abnormality cause determination process. In this case, it is determined that the faucet-side electric hot / cold water mixing valve 6e is abnormal, and the process ends here.

  On the other hand, if the solenoid valve 7 is closed, the process proceeds to step S13 to start measuring the solenoid valve opening time, and the process proceeds to step S14 to open the solenoid valve 7. And it transfers to step S15, it is judged whether predetermined time passed since opening of the solenoid valve 7, and when predetermined time passes, it will transfer to step S16 and will determine the presence or absence of the bath side hot water supply. . In step S16, it is determined whether or not the bath-side flow rate sensor 12f has detected a water flow.

  When water supply is impossible, hot water does not flow into the bath-side mixed hot water supply pipe 2f even if the solenoid valve 7 is opened. Conversely, if hot water flows through the bath-side mixed hot water supply pipe 2f when the solenoid valve 7 is opened, water supply is not impossible. Therefore, when the bath-side flow rate sensor 12f detects a water flow in step S16, it is determined that the faucet-side electric hot / cold water mixing valve 6e is abnormal rather than water supply not possible, and the operation proceeds to step S17 to close the solenoid valve 7. After that, the process ends.

  On the other hand, if the bath flow rate sensor 12f does not detect the water flow in step S16, it is determined that the faucet side electric hot / cold water mixing valve 6e is not abnormal and water supply is not possible. In this case, the process proceeds to step S18 to close the solenoid valve 7, and the process further proceeds to step S19 to determine the presence or absence of the faucet side hot water supply by the faucet side flow rate sensor 12e. If the faucet side flow sensor 12e no longer detects the water flow in step S19, the process proceeds to step S20 to cancel the suspected abnormality of the faucet side electric hot / cold water mixing valve 6e, and the high temperature hot water abnormality performed in step S10. The notification to the user that there is a suspicion of abnormality of the faucet and the faucet side electric hot / cold mixing valve 6e is stopped. And it transfers to step S21, alert | reports to a user by the operation part 8 that water supply is impossible, and complete | finishes a process.

  According to the control operation described above, when a high temperature hot water abnormality occurs, it is accurately determined whether it is caused by the abnormality of the faucet side electric hot water mixing valve 6e or not due to water supply failure. Can do. For this reason, it can be reliably prevented that the faucet side electric hot / cold water mixing valve 6e is normal but the faucet side electric hot water / water mixing valve 6e is erroneously detected.

  Further, as described above, in the present embodiment, in the case of a high temperature hot water discharge abnormality due to the inability to supply water, the notification that the high temperature hot water discharge abnormality is continued while the faucet side flow rate sensor 12e detects the water flow. When the faucet side flow rate sensor 12e stops detecting the water flow, the abnormality notification is stopped. If no water supply is the cause of the high temperature hot water abnormality, there is no abnormality on the device side, and if the water supply failure is resolved, the high temperature hot water abnormality will be resolved. Otherwise, it will be misleading to the user. According to the above control, when the inability to supply water is resolved, the notification of the high temperature hot water abnormality is also canceled, so that it is possible to prevent the user from misleading due to the unnecessary abnormality notification. In addition, since the hot water discharge abnormality is notified while the hot water is being discharged from the faucet 10, the user can be alerted and the safety is excellent.

  Further, in the present embodiment, both the presence / absence of the origin detection in step S7 and the presence / absence of the bath-side hot water supply in step S16 are used together to determine whether water supply is not possible and the abnormality in the faucet-side electric hot / cold water mixing valve 6e. For this reason, more accurate discrimination becomes possible. In the present invention, the determination may be made by one of the two. That is, step S7 may be omitted, and it may be determined that water supply is not possible if there is no bath-side hot water supply in step S16, and if there is bath-side hot water supply, it may be determined that the faucet-side electric hot / cold water mixing valve 6e is abnormal. Further, the determination based on the presence or absence of the bath-side hot water supply is omitted. If the origin is detected in step S7, it is determined that water supply is not possible, and if the origin is not detected, an abnormality of the faucet-side electric hot / cold water mixing valve 6e is detected. You may make it determine.

  As mentioned above, although embodiment of the hot water storage type hot-water supply apparatus of this invention was described, this invention is not limited to said form. For example, the hot water storage unit A may have a configuration including a heat exchanger or a pump provided in the bath-side mixed hot water supply pipe 2 f for tracking hot water in the bathtub 11.

  Further, the method for notifying high temperature hot water abnormality, abnormality of faucet side electric hot water mixing valve 6e, water supply impossibility may be any method such as character guidance, alarm, voice, etc. The apparatus used for notification is limited to the operation unit 8. Instead, notification may be made using another device linked to the hot water storage type hot water supply device.

  When it is determined that the faucet side electric hot / cold water mixing valve 6e is abnormal, the record may be left in the storage device of the control unit 9. By leaving this record, it becomes possible to easily identify the faulty part at the time of repair, and to perform the repair quickly.

A Hot water storage unit B Heat source unit 1 Water supply piping dedicated stopcock 2a Pressure reducing valve primary side water supply piping 2b Hot water tank water supply piping 2c Hot water storage tank water supply piping 2d Pressure reducing valve secondary side water supply piping 2e Faucet side mixed hot water supply piping 2f Bath side mixed hot water supply piping DESCRIPTION OF SYMBOLS 3 Pressure reducing valve 4 Hot water storage tank 5 Relief valve 6e Faucet side electric hot water mixing valve 6f Bath side electric hot water mixing valve 7 Solenoid valve 8 Operation part 9 Control part 10 Faucet 11 Bath 12e Faucet side flow sensor 12f Bath side flow sensor 13a Water supply temperature sensor 13c Hot water storage tank hot water supply temperature sensor 13e Faucet side temperature sensor 13f Bath side temperature sensor

Claims (6)

Heating means for producing hot water;
A hot water storage tank for storing hot water generated by the heating means;
A water supply pipe for supplying cold water from a water source to the hot water storage tank;
A faucet-side mixing valve for producing hot water mixed with hot water supplied from the hot water storage tank and cold water supplied from the water supply pipe, and the hot water supplied to the faucet;
Faucet side temperature detecting means for detecting the temperature of hot water flowing to the faucet,
Mixing valve opening degree control means for controlling the opening degree of the faucet side mixing valve so that the faucet side hot water supply temperature detected by the faucet side temperature detecting means matches the faucet side set temperature set by the user;
An abnormality detection means for detecting occurrence of a high temperature hot water discharge abnormality in which the faucet side hot water supply temperature is abnormally higher than the faucet side set temperature;
An abnormality cause determining means for determining whether the abnormality detecting means detects the occurrence of the high temperature hot water abnormality or whether the trouble is caused by an abnormality of the faucet side mixing valve or an inability to supply water that is not supplied from the water supply pipe; ,
Generating hot water mixed with hot water supplied from the hot water storage tank and cold water supplied from the water supply pipe, and a bath-side mixing valve for supplying the hot water to the bathtub;
A bath-side on-off valve that opens and closes a bath-side hot water supply passage from the bath-side mixing valve to the bathtub;
Bath-side water flow detection means for detecting the water flow in the bath-side hot water supply passage;
Equipped with a,
The abnormality cause determination unit performs an abnormality cause determination process for confirming a detection result of the bath side water flow detection unit after issuing a command to open the bath side opening / closing valve. In the abnormality cause determination process, the bath side water flow detection is performed. A hot water storage type hot water supply apparatus that determines that the faucet side mixing valve is abnormal when a water flow is detected by the means, and determines that the water supply is impossible when no water flow is detected by the bath side water flow detection means . Heating means for producing hot water;
A hot water storage tank for storing hot water generated by the heating means;
A water supply pipe for supplying cold water from a water source to the hot water storage tank;
A faucet-side mixing valve for producing hot water mixed with hot water supplied from the hot water storage tank and cold water supplied from the water supply pipe, and the hot water supplied to the faucet;
Faucet side temperature detecting means for detecting the temperature of hot water flowing to the faucet,
Mixing valve opening degree control means for controlling the opening degree of the faucet side mixing valve so that the faucet side hot water supply temperature detected by the faucet side temperature detecting means matches the faucet side set temperature set by the user;
An abnormality detection means for detecting occurrence of a high temperature hot water discharge abnormality in which the faucet side hot water supply temperature is abnormally higher than the faucet side set temperature;
An abnormality cause determining means for determining whether the abnormality detecting means detects the occurrence of the high temperature hot water abnormality or whether the trouble is caused by an abnormality of the faucet side mixing valve or an inability to supply water that is not supplied from the water supply pipe; ,
Cold water side full open detection means for detecting whether the opening of the faucet side mixing valve is fully open to the cold water side ;
With
When the abnormality detection means detects the occurrence of the high temperature hot water abnormality and the opening of the faucet side mixing valve is fully open to the cold water side, the water supply is impossible or the It determines that there is a possibility, opening savings hot type hot water supply device you determined to be abnormal in the faucet-side mixing valve if not fully opened in cold water side of the faucet-side mixing valve. The hot water storage type hot water supply apparatus according to claim 1 or 2 , further comprising a notifying means for notifying a user of the high temperature hot water supply abnormality when the abnormality detection means detects the occurrence of the high temperature hot water abnormality. When it is determined by the abnormality cause determination means that the faucet side mixing valve is abnormal, the user is informed that a failure has occurred, and when the abnormality cause determination means determines that the water supply is impossible. The hot water storage type hot water supply apparatus according to claim 1 or 2, further comprising notification means for notifying a user that the water supply is impossible. Faucet side water flow detection means for detecting a water flow from the faucet side mixing valve toward the faucet;
When it is determined by the abnormality cause determination means that the water supply is impossible, while the water flow is detected by the faucet side water flow detection means, the user continues to inform the user of the high temperature hot water abnormality, and the faucet side water flow detection means Informing means for stopping the notification of the high temperature hot water abnormality when the water flow is not detected by,
A hot water storage type hot water supply apparatus according to claim 1 or 2 . If it is determined that the abnormality of the faucet-side mixing valve by the abnormality cause discriminating means, any one of claims 1 to 5 comprising a recording means for recording the effect that the faucet side mixing valve has abnormality Hot water storage system.

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