JP6394147B2 - Water heater - Google Patents

Description

  The present invention increases the temperature of the water supply to a predetermined high temperature by heat exchange heating with the combustion heat in the can, and the generated hot water to the hot water tap and the like, and the hot water supply path to the bathtub It is possible to supply in two directions, and hot water in the bathtub is heated up and chased by hot water hot water (hereinafter referred to as “hot water hot water”) through the hot water hot water path to the bathtub after filling. For hot water heaters with a hot water hot water function that can play the same role as watering, avoiding inconveniences when hot water supply is started through a general hot water supply path during hot water hot water operation (in case of hot water interruption) Related to technology.

  In Patent Document 1, a hot water heater with a high temperature hot water hot water function is provided that raises the temperature of hot water in the bathtub and provides the same effect as reheating by hot hot water hot water flowing through the hot water hot water channel to the bathtub after hot water filling. Has been proposed. In such a water heater with a high temperature hot water supply function, if a hot water supply interruption occurs during execution of a high temperature hot water supply operation in which hot water is poured into the bathtub through the high temperature hot water supply channel, the high temperature hot water supply operation is interrupted (stopped). Therefore, priority is given to hot water operation. However, in the transition period from the hot water supply operation to the hot water supply operation, a part of the high temperature hot water remaining in the can such as a heat exchanger flows to the high temperature hot water supply channel side, while the rest branches to the general hot water supply channel side. Will flow.

  For this reason, conventionally, the proposal for avoiding the inconvenience of high temperature hot water flowing to the general hot water supply path side has been made. For example, in Patent Document 2, when the use of hot water supply is started during the execution of the high-temperature hot water supply operation, the temperature detection value at the heat exchanger outlet is reduced to a predetermined value or less until the hot water temperature to the general hot water supply path decreases. It has been proposed to open and close the on-off valve intervened in the high-temperature hot water runway until it drops (see, for example, claim 1 or claim 2 of the same document). .

Japanese Patent No. 3994920 Japanese Patent No. 2909417

  By the way, when hot water is supplied through a general hot water supply channel, the hot water heated in the can body is mixed with bypass water from the water supply channel at a predetermined mixing ratio to adjust the temperature to a predetermined set hot water temperature and then supply hot water. Things have been done. That is, water can be mixed at a predetermined mixing ratio by branching the bypass passage so that the can body is bypassed from the middle of the water supply passage and merged with the general hot water supply passage, and a bypass flow rate adjustment valve is interposed ( (See, for example, paragraph 0026 of FIG. 1 and FIG. 1). Therefore, in order to avoid high temperature hot water flowing into the general hot water supply passage in the transition period of switching from the high temperature hot water supply operation to the hot water supply operation, It is conceivable that the regulating valve is fully opened so that a sufficient amount of bypass water can be mixed even if high-temperature hot water flows into the general hot water supply path during the transition period. By doing in this way, the hot water tap etc. is opened slightly and a small amount of hot water supply flow rate passes through the general hot water supply path, so that the hot water hot water operation is not interrupted, Even if a situation of branching into the general hot water supply path occurs, it is possible to avoid high-temperature hot water from flowing to the hot water tap as it is due to the sufficient amount of mixed water of bypass water.

  However, even if the bypass flow control valve is converted and controlled to the fully open position in advance, the bypass flow control valve has become unable to be driven due to the occurrence of a failure, or is converted into a required open state due to occurrence of a step-out. There is a possibility that there is a problem that it has not been performed or has been performed. In addition, although the bypass flow rate adjusting valve normally converts to the fully opened position, there is a possibility that the internal flow of the bypass water itself may be difficult due to clogging of dust or the like. If such a problem occurs, not only in the transition period of the switching, but also during the hot water supply operation, there is a possibility that the high temperature hot water flows to the hot water tap side as it is, even though it is a minute amount.

  The present invention has been made in view of such circumstances, and the object of the present invention is to interrupt the hot water supply operation when a hot water supply interruption occurs during the execution of the high temperature hot water operation or during the execution. It is an object of the present invention to provide a water heater that can reliably prevent high-temperature hot water from flowing to the hot water tap side through a general hot water supply path in a transition period in which it is stopped and switched to hot water supply operation.

In order to achieve the above-mentioned object, in the present invention, a hot water supply passage for pouring hot water into a bathtub and a hot water tap for hot water supply are provided on the outlet side of the can body for receiving and heating water supplied from the water supply passage. And the general hot water supply path is configured to be able to mix water through the bypass path branched from the water supply path with respect to the hot water heated by the can body, and the bypass path has a mixed water ratio. The following specific items were provided for a water heater provided with a bypass flow rate adjusting valve for changing and adjusting the pressure. That is, a control means for performing hot hot water hot water operation control for pouring predetermined high temperature hot water through the high temperature hot water hot water passage, and as the bypass flow rate adjusting valve, the opening degree of the valve body is changed by drive control of the stepping motor. In addition, the position signal is output to the control means when the valve body is in the fully open position. When the high temperature hot water supply operation is requested as the control means, the stepping motor is driven and controlled so that the valve body of the bypass flow rate adjusting valve is driven to the closed side by a predetermined amount, and then is driven to the fully opened position. When the pre-start process for determining and detecting that the position signal has changed between the non-output state and the output state is executed, and the change cannot be detected by the pre-start process, It was set as the structure which does not perform hot water supply with respect to a road (Claim 1).

For the present invention, since prior to running the insert hot water for hot feed molten metal passage, and drives and controls the bypass flow rate adjustment valve to a fully open position of the valve body as before starting treatment, if loosening of the interrupt hot water usage and water tap Even if high-temperature hot water flows from the can into the general hot water supply path due to generation or the like, the temperature can be lowered by a sufficient amount of mixed water from the bypass path. As a result, it is possible to reliably prevent the hot water from flowing from the general hot water supply channel to the hot water tap side as it is or when the hot water is maintained at a considerably high temperature when the interrupt hot water supply is used. In addition, the position signal changes between the non-output state and the output state, rather than determining / detecting that the bypass flow control valve is set to the fully open position only by the output of the position signal. Therefore, it is possible to determine and confirm that the bypass flow rate adjusting valve has been set to the fully open position by eliminating occurrence of erroneous determination due to failure such as disconnection. possible and that Do not. At this time, since the valve body of the bypass flow rate adjustment valve is driven to the closed side by a predetermined amount and then driven to the fully open position, the current position of the valve body may be unknown or a failure may have already occurred. Can be considered.

  In the present invention, when there is a request for a high-temperature hot water supply operation as the control means, it is determined whether or not a feed water flow rate greater than a predetermined flow rate is generated for the can body, and generation of a feed water flow rate greater than a predetermined flow rate is generated. When it detects, it can be set as the structure which does not perform the hot water supply with respect to the said high temperature hot water supply path (Claim 2). By doing so, it is possible to reliably confirm that hot water supply is not currently used before starting the hot water supply hot water operation. Is possible.

  Further, in the present invention, a hot water supply temperature sensor interposed in a general hot water supply path located downstream from the joining portion with the bypass path is provided, and the high temperature hot water supply path is controlled by the high temperature hot water supply operation control as the control means. The temperature detected by the hot water supply temperature sensor is monitored during execution of the hot water through, and if a predetermined judgment temperature or higher is detected, execution of the hot water through the high temperature hot water passage is forcibly stopped. (Claim 3). By doing so, even when a small amount of flow is generated on the hot-water tap side, even if the bypass flow rate adjustment valve is normally set at the predetermined open side position, it is caused by malfunction such as dust clogging. Therefore, it is possible to reliably avoid high-temperature hot water flowing to the hot water tap side due to a situation where the mixed water is insufficient.

  In this case, a hot water supply path for branching from the general hot water supply path at a position downstream of the hot water supply temperature sensor and pouring into the bathtub, and a hot water electromagnetic valve for opening and closing the hot water supply path are provided. As the control means, when there is a request for a hot water supply hot water operation, the pouring solenoid valve is temporarily opened to temporarily pour or pour low temperature hot water or water into the bathtub. Alternatively, the hot water supply to the high temperature hot water supply passage can be performed after the start pretreatment for filling the general hot water supply passage at the hot water supply temperature sensor position with low temperature hot water or water by pouring water (invoice). Item 4). By doing in this way, it is possible to avoid in advance the occurrence of an erroneous determination that may occur when a relatively high temperature hot water remains in the piping at the position where the hot water supply temperature sensor is interposed for some reason. . In other words, by performing the pre-start process, it becomes possible to fill the piping at the position where the hot water supply temperature sensor is interposed with low temperature hot water or water. This makes it possible to avoid the occurrence of erroneous determination.

In order to achieve the above object, in another invention, a hot water supply passage for pouring hot water into a bathtub and hot water supply to a hot water tap on the hot water outlet side of the can body for receiving and heating water supplied from the water supply passage. And the general hot water supply path is configured to be able to mix water through the bypass path branched from the water supply path with respect to the hot water heated by the can body, and the bypass path is mixed. In a water heater provided with a bypass flow rate adjustment valve for changing and adjusting the water ratio,
A hot water supply temperature interposed between the control means for performing hot hot water hot water operation control for pouring predetermined high temperature hot water through the high temperature hot water supply path, and a general hot water supply path located downstream from the junction with the bypass path and a sensor, and a pouring passage for pouring the bathtub branches from general hot water supply passage downstream position than the hot water temperature sensor, and further comprising a pouring solenoid valve for opening and closing switching the Chuyuro As the bypass flow rate adjusting valve, the opening degree of the valve body is changed and adjusted by drive control of the stepping motor, and a position signal is output to the control means when the valve body is at a predetermined open position. Configure. Then, as the previous SL control means, when a request for high temperature feed water operation, the stepping motor drive control and drives and controls the valve body of the bypass flow rate adjusting valve to the predetermined opening-side position, the position When the pre-start process for determining and detecting that the signal has changed between the non-output state and the output state is executed, and the change cannot be detected by this pre-start process, is configured not to perform the hot water, in addition, during the execution of the pointing water through the hot feed molten metal passage by the high temperature feed water operation control, if prior Symbol predetermined judgment temperature or higher is detected by the hot water temperature sensor, If the hot water supply temperature sensor detects a temperature equal to or higher than the predetermined determination temperature even if the hot water supply solenoid valve detects that the hot water supply temperature sensor still detects the hot water supply temperature, Through the road It was forced to configuration for stopping the execution of the pointing water (claim 5). Ri by the so doing, the sheet when the hot water faucet in a minute amount in the side stream is occurring, the bypass flow rate adjustment valve is even set to a predetermined opening-side position correctly, malfunctions occur such as dust clogging It is possible to reliably avoid high-temperature hot water from flowing toward the hot water tap due to the fact that the mixed water is inadequate due to the above. In addition, after the hot water is poured into the bathtub temporarily, the hot water is forcibly stopped if the detection still exceeds the judgment temperature. It is possible to forcibly stop the hot water supply after reliably determining that the problem is caused by malfunction such as clogging of dust.

In addition, since the bypass flow rate adjustment valve is driven and controlled to the specified open position as a pre-start process before hot water supply to the hot water hot water supply path, if interrupted hot water is used, hot water tap looseness, etc. Even if hot water flows from the can into the general hot water supply passage, the temperature can be lowered by a sufficient amount of mixed water from the bypass passage. As a result, it is possible to reliably prevent the hot water from flowing from the general hot water supply channel to the hot water tap side as it is or when the hot water is maintained at a considerably high temperature when the interrupt hot water supply is used. Moreover, it is not determined or detected that the bypass flow rate adjusting valve is set to the open position only by the output of the position signal, but between the non-output state and the output state. Judgment / detection is made when there is a change, eliminating erroneous judgments caused by faults such as disconnection, and making sure that the bypass flow control valve is reliably set to the open position. It becomes possible. Ki out to the fully open position of the valve body as a predetermined open-side position in the invention according to according claim 5, as the control means, when a request for high temperature feed water operation, the stepping motor drive control to The valve body of the bypass flow rate adjusting valve can be configured to be driven and controlled to the fully opened position after being driven to the closed side by a predetermined amount (Claim 6). By doing so, even if the generally hot water path hot water flows, the water mixture a sufficient amount of water from the bypass passage, that sufficiently Do can flow to the hot-water tap side in terms of reduced temperature . In addition, it may be considered that the current position of the valve body is unknown or a failure has already occurred.

As described above, according to one of the water heater of claims 1 to 4, the drive before performing the pointing water to high feed molten metal passage, a bypass flow rate adjustment valve to a fully open position as the start pretreatment Therefore, even if high-temperature hot water flows from the can body to the general hot water supply path due to the use of interrupted hot water supply or the occurrence of loosening of the hot-water tap, the temperature can be lowered by a sufficient amount of mixed water from the bypass path. it can. Thereby, when interruption hot water supply use arises, it can prevent reliably that high temperature hot water flows into the hot-water tap side from a general hot water supply path as it is, or with a fairly high temperature state maintained. Moreover, the position signal has changed between the non-output state and the output state, rather than being judged / detected only by the output of the position signal that the bypass flow control valve has been set to the fully open position. Therefore, it is possible to confirm and confirm that the bypass flow rate adjustment valve has been set to the fully open position by eliminating the occurrence of misjudgment caused by failure such as disconnection. ing to. At this time, since the valve body of the bypass flow rate adjustment valve is driven to the closed side by a predetermined amount and then driven to the fully open position, the current position of the valve body may be unknown or a failure may have already occurred. Can be considered.

  According to the water heater of claim 2, when there is a request for high-temperature hot water supply operation as a control means, it is determined whether or not a water supply flow rate of a predetermined flow rate or more is generated in the can body, and a water supply of a predetermined flow rate or higher is determined. When the occurrence of flow rate is detected, it is ensured that hot water supply is not currently used before starting the hot water supply operation by adopting a configuration that does not execute hot water supply to the hot water supply passage. In addition to being able to confirm, the high temperature hot water supply operation can be started after confirmation.

  Moreover, according to the hot water heater of the third aspect, the hot water supply temperature sensor provided in the general hot water supply passage located downstream of the joining portion with the bypass passage is provided. A configuration in which the temperature detected by the hot water supply temperature sensor is monitored during the hot water supply passage through the high temperature hot water supply passage, and the hot water supply passage through the high temperature hot water supply passage is forcibly stopped if a temperature above a predetermined judgment temperature is detected. Therefore, even if the bypass flow rate adjustment valve is normally set to the predetermined open position when there is a small amount of flow on the hot-water tap side, it will be mixed due to malfunctions such as dust clogging. It is possible to reliably avoid high-temperature hot water flowing toward the hot water tap due to insufficient water.

  In this case, a hot water supply path for branching from the general hot water supply path located downstream of the hot water supply temperature sensor and pouring water into the bathtub, as in the water heater of claim 4, and an opening / closing switch for switching the hot water supply path. When there is a request for high-temperature hot water supply operation as a control means, the hot water solenoid valve is temporarily opened to temporarily pour low temperature hot water or water into the bathtub. Or after pouring water and performing the pre-start process for filling the general hot water supply path at the hot water supply temperature sensor position with the low-temperature hot water or water by this pouring or water injection, the hot water supply to the high-temperature hot water supply path is executed. As a result, it is possible to avoid in advance the occurrence of a misjudgment that may occur when a relatively high temperature of hot water remains in the piping at the position where the hot water supply temperature sensor is interposed for some reason. In other words, by performing the pre-start process, the piping at the position where the hot water temperature sensor is interposed can be filled with low temperature hot water or water, and the temperature monitoring by the hot water temperature sensor during the subsequent hot water hot water operation can be accurately performed. As a result, the occurrence of erroneous determination can be reliably avoided.

Furthermore, according to the water heater of claim 5, the hot water temperature sensor interposed in the general hot water path located downstream from the joining portion with the bypass path, and the general hot water path positioned downstream from the hot water temperature sensor And a pouring solenoid valve for opening and closing the pouring passage, and a hot water temperature sensor detects a temperature equal to or higher than a predetermined judgment temperature as a control means. If the hot water supply temperature sensor detects a temperature equal to or higher than the predetermined judgment temperature even after pouring, the hot water supply channel is opened. since the execution of the pointing water was forcibly configured to stop through, if the small amount of flow occurs in the hot-water tap side, the bypass flow rate adjusting valve is set to a predetermined opening-side position correctly However, mixed water due to malfunctions such as clogging of garbage Due to have fallen enough situation, high-temperature hot water it is possible to reliably avoid that will flow to the water tap side. In addition, after the hot water is poured into the bathtub temporarily, the hot water is forcibly stopped if the detection still exceeds the judgment temperature. It is possible to forcibly stop the hot water supply after reliably determining that the problem is caused by malfunction such as clogging of garbage.

In addition, since the bypass flow rate adjustment valve is driven and controlled to the specified open position as a pre-start process before hot water supply to the hot water hot water supply path, if interrupted hot water is used, hot water tap looseness, etc. Even if hot water flows from the can into the general hot water supply passage, the temperature can be lowered by a sufficient amount of mixed water from the bypass passage. As a result, it is possible to reliably prevent the hot water from flowing from the general hot water supply channel to the hot water tap side as it is or when the hot water is maintained at a considerably high temperature when the interrupt hot water supply is used. Moreover, it is not determined or detected that the bypass flow rate adjusting valve is set to the open position only by the output of the position signal, but between the non-output state and the output state. Judgment / detection is made when there is a change, eliminating erroneous judgments caused by faults such as disconnection, and making sure that the bypass flow control valve is reliably set to the open position. It becomes possible. Then, according to the water heater of claim 6, by the fully open position of the valve member as the predetermined opening-side position, even in general hot water path high temperature fluidity, mixing a sufficient amount of water from the bypass passage it can be water, ing so as to be able to flow to the hot-water tap side in terms of sufficiently lowered temperature. In addition, it may be considered that the current position of the valve body is unknown or a failure has already occurred.

It is a schematic diagram of the water heater which concerns on embodiment of this invention. It is a block block diagram of the controller which performs the operation control of the water heater of FIG. It is a flowchart which shows the whole high temperature hot water operation control by the hot water control part of FIG. It is a flowchart which shows the specific content of the pre-start process 1 of FIG. It is a flowchart which shows the specific content of the pre-start process 2 of FIG. It is a flowchart which shows the specific content of the pre-start process 3 of FIG. It is a flowchart which shows the specific content of the hot water supply path | route temperature monitoring process of FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows a water heater 1 according to the present invention. The water heater 1 is configured with a high-temperature hot-water supply function, and in the can 2, water from the water supply passage 3 is supplied at a predetermined high temperature (for example, 80 ° C. in the case of high-temperature hot water and 75 in the case of hot water supply, for example). The hot water discharged from the hot water supply passage 4 after heat exchange heating to [° C.] can be branched and supplied to the general hot water supply passage 5 leading to the hot water tap 51 and the like and the hot water supply passage 7 directly leading to the bathtub 6. Yes. The general hot water supply path 5 is connected so that the downstream end of the bypass path 8 joins at a midway position thereof. Through this bypass path 8, water having a predetermined flow rate diverted from the water supply path 3 by the bypass flow rate adjustment valve 81. Can be introduced. By mixing a predetermined amount of hot water in the general hot water supply channel 5 by mixing ratio control based on the opening degree control of the bypass flow rate adjustment valve 81, the hot water supply temperature to the hot water tap 51 (or the pouring channel 9) (or The pouring temperature is adjusted to a predetermined set hot water supply temperature (or set pouring temperature) of 40 ° C., for example. Further, a pouring passage 9 is branched from the general hot water supply passage 5 located downstream from the joining position of the bypass passage 8, and the downstream end of the pouring passage 9 is connected to the bathtub 6, and the set pouring temperature is set. The hot water adjusted in temperature can be poured into the bathtub 6 for filling. The downstream end of the high temperature hot water supply passage 7 is connected in the middle of the pouring passage 9 so that the high temperature hot water flowing into the high temperature hot water supply passage 7 is supplied to the bathtub 6 through the downstream side of the pouring hot water passage 9. It has become so. By performing this, the hot hot water is heated to raise the temperature of the hot water in the bathtub 6 after filling and plays a role equivalent to reheating. Hereinafter, each component will be described in detail.

  The can body 2 receives combustion air supplied from the blower fan 21 and fuel gas supplied from the fuel supply system 22 and burns, and heat exchange heat-heated by the combustion heat of the combustion burner 23. The devices 24 and 25 are built in. The combustion burner 23 is configured such that, for example, three regions can be burned independently or in any combination, and as a heat exchanger, a main heat exchanger 24 for heat exchange heating by sensible heat of combustion gas and The auxiliary heat exchanger 25 for preheating by recovering the latent heat of the combustion exhaust gas after passing through the main heat exchanger 24. The inlet of the auxiliary heat exchanger 25 is connected to the downstream end of the water supply channel 3 that is connected to a water pipe or a water tank and supplies clean water, and after passing through the auxiliary heat exchanger 25, the main heat exchanger The hot water heated and exchanged while passing through 24 is discharged to the upstream end of the hot water outlet 4 connected to the outlet of the main heat exchanger 24. In addition, the point provided with two types of thing 24 and 25 as a heat exchanger, the point provided with three area | regions in which the combustion burner 23 can be independently burned, etc. are not essential in this invention. The present invention can be applied as long as it can be heated by receiving water.

  In the water supply path 3, a can body flow rate sensor 31 for detecting a water supply flow rate of water supplied to the can body 2 on the downstream side (can body 2 side) from the branch position of the bypass path 8 and a water supply temperature thereof are detected. The feed water temperature sensor 32 is interposed. And the can body temperature sensor 41 for detecting the tapping temperature of the hot water heated by the heat exchange heat in the can body 2 is interposed in the tapping channel 4.

  In the general hot water supply path 5, a check valve 52 is interposed at an upstream position of the joining position of the bypass path 8, while an excessive outflow occurs at a branch position of the pouring passage 9 downstream of the joining position. A hot water supply flow rate adjustment valve 53, also called a prevention valve, is interposed, and at a position upstream thereof, a hot water supply temperature sensor 54 that detects a hot water supply temperature supplied to the hot water tap 51 or the pouring channel 9, and a hot water supply flow rate that detects the hot water supply flow rate. Sensors 55 are respectively interposed.

  The hot water supply passage 7 is constituted by an electromagnetic on-off valve that is kept in a closed state in a non-energized state and is switched to open when energized. A valve 71 and a hot water flow rate adjusting valve 72 capable of changing and adjusting the hot water flow rate by adjusting the opening degree are respectively provided. Since the hot water solenoid valve 71 and the hot water flow rate adjustment valve 72 are installed independently of each other, for example, even if a power failure occurs, the hot water hot water passage 7 is reliably blocked and the bathtub 6 It is possible to prevent the hot water from flowing to the side. That is, for example, when both the opening / closing function and the flow rate adjusting function of the hot water supply passage 7 are realized by one device using a flow rate adjusting valve with a closing function, a power failure occurs during the hot water supply operation. If one occurs, there may be an inconvenience that it remains open. On the other hand, as described above, the hot water solenoid valve 71 and the hot water flow rate adjustment valve 72 are installed independently of each other, so that the hot water solenoid valve 71 is controlled to be in an open state and the hot water hot water operation is in progress. Even if there is a power failure, the hot water solenoid valve 71 can be automatically returned to the closed state, and the high temperature hot water channel 7 can be reliably switched to the shut-off state.

  The bypass flow rate adjustment valve 81 is an on-off valve whose opening degree is changed and adjusted by drive control of the stepping motor. When the stepping motor is rotated, for example, in the forward direction, the opening degree of the bypass flow rate adjustment valve 81 is increased and the passing flow rate is increased. When it is increased and rotated in the reverse direction, the opening degree is reduced and the passage flow rate is reduced. A step number obtained by dividing a rotation angle of a stepping motor for driving the valve body of the bypass flow rate adjusting valve 81 from a fully open position to a fully closed position by a basic angle is referred to as a step number. The controller 10 controls the drive amount of the stepping motor by controlling the required number of steps from the step) to the fully closed position step number (for example, 3400 steps), whereby the opening degree of the bypass flow rate adjustment valve 81 is predetermined. The opening can be adjusted. Further, the stepping motor is provided with a limiter (full open limiter) at at least one valve opening position in the open / close range (fully open position to fully closed position) of the valve body of the bypass flow rate adjusting valve 81, for example, the fully open position. An open limiter signal (position signal) is output to the controller 10 by controlling the valve body of the flow rate adjusting valve 81 to the fully open position.

  Further, the pouring passage 9 has a pouring electromagnetic valve 91 constituted by an electromagnetic on-off valve for switching whether or not the pouring is performed by pouring by opening and closing, and pouring for detecting the pouring flow rate. A flow sensor 92 is interposed. Further, the pouring channel 9 has a vacuum breaker 93 for destroying the negative pressure and preventing the back flow and a path to the bathtub 6 on the downstream side of the merging position at the downstream end of the high temperature hot water channel 7. A bath path temperature sensor 94 for detecting the temperature (flow path temperature) of the flowing hot water is interposed. This bath path temperature sensor 94 is for detecting the temperature of hot water flowing to the bathtub 6 side through the high temperature hot water supply path 7, and therefore is not at the pouring path 9 but at an appropriate place of the high temperature hot water supply path 7, for example, pouring water. It is also possible to interpose at a position upstream of the joining position with the passage 9 and downstream of the hot water solenoid valve 71.

  A stirring adapter 61 is installed in the bathtub 6, and the downstream end of the pouring channel 9, that is, the downstream end of the high-temperature hot water supply channel 7 is connected to the stirring adapter 61. And the stirring adapter 61 takes in the hot water in the bathtub 6, mixes with high temperature hot water, and stirs it, and then makes it discharge in the bathtub 6. At this time, the temperature of the hot water in the bathtub 6 taken in is detected by the bathtub temperature sensor 62 and is output to the controller 10 via the bathroom remote controller 102.

  In the above water heater, hot water supply control for executing hot water supply to the hot water tap 51 at a predetermined set hot water temperature, hot water control for the bathtub 6 and hot water in the bathtub 6 after hot water is poured. Various operation controls including hot water control that performs the same function as reheating, such as output of input setting signals and operation signals from various remote controllers such as the kitchen remote controller 101 and bathroom remote controller 102, various temperature sensors, etc. In response to the detection signal output from the controller 10, the controller (control means) 10 executes it. For such operation control, the controller 10 includes a hot water supply control unit 103 (see FIG. 2) that performs hot water supply control, a hot water control unit 104 that performs hot water control, and a hot water control unit that performs high temperature hot water operation control. The hot water supply control unit 105 further includes a pre-start processing unit 106, a hot water supply path temperature monitoring processing unit 107, and the like. The controller 10 is mainly configured by a microcomputer including a CPU, a rewritable memory, an input / output interface, and the like, and performs the hot water supply control and hot water control based on programs and various data stored in the memory. ing.

  For example, when the hot-water tap 51 is opened by the user and the hot-water supply flow rate sensor 55 detects a predetermined minimum operating flow rate (MOQ) in a state where high-temperature hot-water supply operation control is not being performed, A combustion system composed of the fuel supply system 22 is operated to discharge hot water having a predetermined high temperature (for example, 60 to 75 ° C.) for hot water supply to the hot water supply passage 4 and the general hot water supply passage 5, while the detected water supply temperature by the water supply temperature sensor 32 Based on the detected hot water temperature detected by the can body temperature sensor 41, the detected hot water temperature detected by the hot water temperature sensor 54, and the set hot water temperature input and set in the remote controllers 101, 102, the mixing ratio control by the bypass flow rate adjustment valve 81, and the hot water flow rate adjustment valve The opening degree control of 53 is performed. As a result, hot water whose temperature is adjusted to a predetermined set hot water supply temperature (for example, 40 ° C.) is supplied to the hot-water tap 51. For example, when the amount of mixed water is increased by the mixing ratio control of the bypass flow rate adjusting valve 81, the high temperature hot water from the can body 2 is adjusted to a lower temperature side. Further, for example, when the hot water supply tap 51 is opened to the maximum side and falls into a large flow rate water supply state, even if the combustion system is heated and controlled at the maximum capacity, the heat exchangers 24 and 25 cannot raise the temperature to a predetermined temperature. The hot water supply flow rate adjusting valve 55 is throttled by a predetermined amount to ensure a temperature rise to a predetermined temperature.

  The hot water filling control unit 104 opens the hot water solenoid valve 91 when, for example, a hot water filling switch or automatic bath switch of the bathroom remote control 102 is turned on by the user, and in the same way as the hot water supply control of the hot water supply control unit 103, combustion The combustion operation of the systems 22 and 23 and the opening control of the bypass flow rate adjustment valve 81 and the hot water supply flow rate adjustment valve 53 are performed, and the temperature is adjusted to the set pouring temperature (set hot water filling temperature) set and input to the bathroom remote controller 102. The hot water is poured into the bathtub 6.

  Hereinafter, the hot water hot water operation control by the hot water controller 105 will be described in detail with reference to FIGS. As shown in FIG. 3, when the trigger for starting the hot water hot water operation control is turned on (YES in step S1), first, a pre-start process (step S2) is executed, and this pre-start process is completed. After that (YES in step S3), the hot water supply operation control is executed (step S4).

  There are the following triggers for starting the hot water hot water operation control. For example, after the hot water filling control is executed and the hot water filling is completed in the bathtub 6, for example, a reheating switch (a switch for heating the hot water supply hot water) of the bathroom remote controller 102 is turned ON by the user, and the ON operation is performed. When a signal is output to the controller 10 and the hot water filling is completed and the heat insulation switch of the bathroom remote control 102 is turned on by the user, a predetermined time (for example, 20 minutes) for performing the heat insulation operation has elapsed. Or when the bath automatic switch of the remote control 101, 102 is turned ON by the user, it has been detected that there is remaining hot water up to the previous time in the bathtub 6 and that the temperature has dropped below a predetermined temperature, The hot water hot water operation control is executed by using the request for the high temperature hot water hot water operation as a trigger.

  As the pre-start process, three types of pre-start processes 1 to 3 are provided, and these can be processed in parallel, or can be processed in a predetermined order. The pre-start process 1 is a process for ensuring that the bypass flow rate adjustment valve 81 is always set to the fully open position in advance when hot hot water is supplied. Specifically, as shown in FIG. 4, first, the bypass flow rate adjustment valve 81 is driven to the fully open position (step S11). At this time, considering that the current position is unknown or that a failure has already occurred, the first position is driven to the closed side and then the fully opened position is driven. Then, it is determined whether or not the output of the open limiter signal has changed from the non-output state to the output state until then (step S12), and if the change from the non-output state to the output state is detected, the bypass flow rate adjustment valve 81 is Assuming that the fully opened position is set, the pre-start process 1 is completed and the process proceeds to the next. If such a change does not occur, an error process is performed (step S13).

  Here, it is not determined / detected only that there is an output of the open limiter signal, but it is determined that there is a change between a state where there is no open limiter signal (non-output state) and a state where there is an output (output state). -The reason for detecting is to prevent misjudgment caused by the occurrence of failure such as disconnection. That is, when it reaches the fully open position, for example, when it is connected to the ground and an open limiter signal corresponding to this is output, it is determined that the fully open position has been reached only on the condition that there is an open limiter signal output. This is because an erroneous determination may occur due to a failure such as a disconnection. Therefore, by determining that the fully open position has been reached when the change between the non-output state and the output state has occurred as described above, it is possible to eliminate the occurrence of erroneous determination caused by a failure such as disconnection. It can be confirmed that the flow rate adjustment valve 81 is reliably set to the fully open position. Then, if the bypass flow rate adjustment valve 81 is reliably set to the fully open position, even if high-temperature hot water flows from the hot water supply path 4 to the general hot water supply path 5 due to use of interrupted hot water supply or occurrence of loosening of the hot water tap 51, The temperature can be lowered by a sufficient amount of mixed water from the bypass passage 8, and when hot water use is interrupted, the hot water remains as it is or is maintained at a fairly high temperature, and the hot water tap 51 is connected from the general hot water passage 5. It can be reliably prevented from flowing to the side. As the error process, even if a warning is displayed on the remote controllers 101 and 102 to indicate that an abnormality has occurred in the bypass flow rate adjustment valve 81, and a trigger for starting high-temperature hot water operation control is established, The execution of the high-temperature hot water hot water operation control is forcibly prohibited, and a warning is similarly displayed.

  The pre-start process 2 is a pre-process for reliably avoiding an erroneous determination in a process performed by the hot water supply path temperature monitoring processing unit 107 described later. The hot water supply temperature sensor 54 detects a temperature equal to or higher than a predetermined determination temperature (a temperature that is too high as the hot water supply temperature; for example, 45 ° C.), as will be described later with respect to the hot water supply path temperature monitoring processing unit 107. This is a false determination that may occur if hot water happens to remain at the location of the hot water supply temperature sensor 54 in performing safety processing that forcibly stops or prohibits execution of high-temperature hot water hot water operation control. This is pre-processing for avoiding the occurrence. Specifically, as shown in FIG. 5, first, after outputting a combustion inhibition command or a combustion reduction command for suppressing the combustion amount to a rather low level to the hot water supply control unit 103 (step S21), The valve 91 is opened and converted (step S22). Thereby, if water or low temperature water flows with respect to the general hot water supply path 5 and the pouring path 9, and this passes predetermined amount (it is YES at step S23), the pouring electromagnetic valve 91 will be closed-converted (step S24), and it will start As the preprocessing 2 is completed, the process proceeds to the next. The predetermined amount can be set based on the amount corresponding to the piping capacity of the hot water supply passage 4 and the general hot water supply passage 5 from the heat exchanger 24 in the can body 2 to the hot water supply temperature sensor 54. Thereby, the temperature of the hot water at the position of the hot water supply temperature sensor 54 can be reliably maintained lower than the determination value, and the possibility of the occurrence of the erroneous determination can be reliably avoided.

  In the case of the pre-start process 2 described above, the control for filling at least the general hot water supply path 5 up to the position of the hot water temperature sensor 54 with water or low-temperature water is uniformly executed as the pre-start process of the hot water supply operation control. However, the present invention is not limited to this, and the pre-start process 2 can be executed only when the hot water supply temperature sensor 54 detects a detected temperature equal to or higher than a predetermined determination value. As the determination value, a temperature that is too high as the hot water supply temperature (for example, 45 ° C. or more) can be set as described above. Thus, by performing the pre-start process 2 only when the hot water temperature sensor 54 detects a detected temperature that is equal to or higher than a predetermined determination value, a pre-process is performed in advance to avoid the possibility of erroneous determination. It can be done only when necessary.

  The pre-start process 3 is a process for confirming that hot water supply is not currently used before starting the hot water supply hot water operation. For this reason, as shown in FIG. 6, after confirming that the can flow sensor 31 has not detected a flow rate higher than MOQ (minimum operating flow rate; for example, 2 L / min) (NO in step S31), the next The process proceeds to. If the can body flow sensor 31 detects a flow rate equal to or higher than the MOQ in step S31 (YES in step S31), the hot water supply control unit 103 performs the hot water supply control by stopping the subsequent start of the high temperature hot water supply operation control. Prioritize execution of the hot water supply hot water operation control until use of the hot water supply ends (YES in steps S32 and S33). Then, monitoring by the can body flow sensor 31 in step S33 is continued, and after confirming that the detected value is less than the MOQ (NO in step S33), the process proceeds to the next process.

  In addition to the above pre-start process, the following process can be added as a pre-start process for the hot water supply flow rate adjustment valve 53. That is, the hot water supply flow rate adjustment valve 53 is changed to a state in which the hot water supply flow rate adjustment valve 53 is throttled to a predetermined set opening degree, and is kept on standby. As this standby position (predetermined set opening degree of the hot water supply flow rate adjustment valve 53), an opening degree corresponding to the central position between the fully open and fully closed state can be set. That is, by restricting the hot water supply flow rate adjustment valve 53 and setting the bypass flow rate adjustment valve 81 to the fully open position by the above-described pre-start process 1, a situation where high temperature hot water flows down to the hot water supply tap 51 side is more reliably generated. Avoid it.

  Basic hot water control (step S4-1) and hot water supply interruption processing (step S4-3) in the high-temperature hot water operation control (YES in step S3, S4) executed after completion of the above pre-start processes 1-3. ) Is briefly described below.

  As basic hot water control (step S4-1), the hot water solenoid valve 71 is switched open to start the combustion operation of the combustion systems 22 and 23, and the opening degree of the hot water flow rate adjustment valve 72 is changed and adjusted. The hot water flow rate control is executed so as to be constant at a hot water flow rate (for example, 4 L / min). As the hot water flow rate control, the opening degree of the hot water flow rate adjustment valve 72 can be feedback-controlled based on the detected flow rate output from the can flow rate sensor 31 so that the hot water flow rate becomes the predetermined value. This hot water supply is continued while confirming that the hot water supply is not being used, for example, by detecting that the detected flow rate of the hot water supply flow sensor 55 is zero, until the termination condition of the hot water supply operation is satisfied. Then, the hot water switch of the bathroom remote controller 102 is turned off, the hot hot water amount based on the integration of the detected hot water flow rate value has reached the set hot water amount, If the hot water hot water operation end condition is satisfied, that is, the hot water temperature is raised to a predetermined temperature, the combustion operation of the combustion systems 22 and 23 is stopped, and then the hot water solenoid valve 71 is closed and controlled. Then, the hot water bath operation is terminated. At this time, after the combustion operation is stopped, the hot water solenoid valve 71 is maintained in an open state until a predetermined short time (for example, 10 to 20 seconds) elapses, and the hot water supply to the bathtub 6 side is continued. After confirming that the detected temperature at the installation position of the path temperature sensor 94 has decreased to a predetermined set temperature (for example, 40 to 45 ° C.), the hot water solenoid valve 71 is closed and controlled to perform high temperature hot water operation. It can be made to end.

  On the other hand, in the hot water supply interruption process (step S4-3) performed in parallel with the basic hot water control (step S4-1), the detection value of the hot water supply flow sensor 55 is continuously monitored. When the flow rate is detected and the start of hot water supply use is detected, the hot water supply operation is interrupted, thereby giving priority to hot water supply control by the hot water supply control unit 103. In the transition period from the interruption of the high-temperature hot water supply operation to the start of the hot water supply control, control for the next transition period can be interposed. For example, while maintaining the hot water solenoid valve 71 in the open state and maintaining the opening degree of the hot water flow rate adjustment valve 72 at the control opening degree (immediate opening degree) immediately before the use of the hot water supply is started, A reduction process is performed and hot water supply to the bathtub 6 side is continued. That is, the amount of combustion in the combustion systems 22 and 23 is reduced or the combustion is stopped, and hot water having a temperature equal to or lower than the hot water supply temperature or equal to the hot water supply temperature is discharged to the hot water outlet 4. After this is continued for a short time (for example, 10 to 20 seconds) until the temperature detected by the bath path temperature sensor 94 decreases to the set temperature set as the decreased temperature as described above, the hot water solenoid valve 71 is turned on. The high temperature hot water supply operation is interrupted by closing control and the hot water supply control unit 103 is shifted to normal hot water supply control. When it is determined that the use of hot water supply is stopped based on the detected flow rate of the hot water supply flow rate sensor 55, the hot water supply operation is restarted again.

  The hot water supply path temperature monitoring process (step S4-2) performed in parallel with the basic hot water control (step S4-1) and the hot water supply interruption process (step S4-3) focuses on the following points. Is what you do. That is, although the process for confirming that the bypass flow rate adjusting valve 81 has been set to the fully open position and has been set to the fully open position has been completed by the pre-start process 1, the bypass flow rate adjusting valve 81 is driven. Considering the countermeasures when sufficient water content cannot be secured due to causes other than malfunction of the system and control system. Specifically, even if the bypass flow rate adjustment valve 81 is correctly controlled to the fully open position in the pre-start process 1, dust clogging or the like occurs in the passage or the like in the bypass flow rate adjustment valve 81. Therefore, the valve body is correctly set to the fully open position. However, it is assumed that there will be a situation where the passage of bypass water is hindered and securing a sufficient amount of mixed water is hindered, and the flow of hot water to the hot water tap 51 side caused by such a situation is avoided. Is to do. For this reason, the hot water supply path temperature monitoring process (step S4-2) monitors the temperature detected by the hot water supply temperature sensor 54 during the high temperature hot water supply operation, and a predetermined determination temperature (a temperature that is too high as the hot water supply temperature; On the condition that a temperature of 45 ° C. or higher is detected, the error processing is forcibly stopped or prohibited from being executed. Note that the condition of temperature detection above the determination temperature is not instantaneously satisfied, but is determined to be satisfied by continuing for a predetermined time, and the hot water supply operation control is forcibly stopped or prohibited. . The predetermined time can be 3 to 25 seconds.

  On the other hand, from the viewpoint that the malfunction caused by the clogging of dust is not irrecoverable, the error processing is not executed immediately, but relatively hot water near the hot water supply temperature sensor 54 is used for the time being. Since there is a possibility of recovery by discharging to the side, error processing can be executed on condition that the temperature detection above the determination temperature is repeated a plurality of times (for example, twice). As an example of this, as shown in FIG. 7, first, after confirming that the hot water supply operation is currently being performed (YES in step S41), whether or not the temperature detected by the hot water supply temperature sensor 54 is equal to or higher than the determination temperature. Is determined (step S42). If the detected temperature equal to or higher than the determination temperature continues for the predetermined time (YES in step S42), if it is the first time (NO in step S43), the pouring electromagnetic valve 91 is opened and the predetermined amount is set. The water is poured into the bathtub 6 until it flows (NO in step S44 and step S45). Here, the predetermined amount is an amount corresponding to the piping capacity of the hot water supply path 4 and the general hot water supply path 5 from the heat exchanger 24 in the can body 2 to the hot water supply temperature sensor 54 as in the case of the pre-start process 2. The detection of passage of a predetermined amount can be obtained by integrating the detection values of the pouring flow rate sensor 92. When a predetermined amount of pouring is finished (YES in step S45), the pouring electromagnetic valve 91 is closed and the process proceeds. By this pouring, if there is no dust clogging in the bypass flow rate adjustment valve 81 and the bypass passage 8 and the bypass water flows normally, the hot water that has been sufficiently mixed and cooled down passes through the position of the hot water supply temperature sensor 54. If the pouring solenoid valve 91 is closed and converted, the low temperature hot water should stay in the hot water supply temperature sensor 54 position. On the other hand, while the high-temperature hot water supply operation is continued (YES in step S41), if detection of the determination temperature or higher by the hot-water supply temperature sensor 54 continues again for a predetermined time (YES in step S42), this is the second detection ( YES in step S43), it is determined that the mixed water from the bypass path 8 is insufficient due to the occurrence of clogging of dust and the like, and the error processing is executed (step S47). Of course, in this error processing, in addition to forcibly stopping the hot water hot water operation control, a warning display to the remote controllers 101 and 102 can be added. Instead of the predetermined amount of passage in step S45, detection with the hot water supply temperature sensor 54 being lower than the determination temperature can be used as a determination condition. If the hot water supply temperature sensor 54 detects a temperature lower than the determination temperature, the hot water solenoid valve 91 in step S46 is closed and converted. Alternatively, instead of detecting the predetermined amount of passage or detection below the determination temperature, an elapsed time corresponding to any one of these is set, and the elapsed time corresponding to any of these is set, and the elapsed time corresponding to the time is measured by a timer, whereby the pouring electromagnetic valve 91 is closed and converted. It can also be done.

  By the above hot water supply path temperature monitoring process (step S4-2), the following effects can be obtained. That is, if the hot water supply operation is in progress, the high temperature hot water supply operation is controlled so that the hot water supply hot water is passed through the high temperature hot water supply passage 9 and the use of the hot water supply is stopped. In principle, the hot water does not flow into the general hot water supply channel 5 and the inside of the general hot water supply channel 5 remains stationary. For example, a flow rate less than the MOQ flows to the hot water tap 51 side. It is conceivable that there is a situation in which the high-temperature hot water flows into the general hot water supply path 5. Even in this case, if the bypass flow rate adjustment valve 81 is in the fully open position and the bypass passage 8 can normally pass water, the hot water passing through the hot water supply temperature sensor 54 position due to sufficient mixed water should be low-temperature water. is there. However, if the hot water supply temperature sensor 54 detects a temperature equal to or higher than the above-described determination value, the bypass flow rate adjustment valve 81 is in the fully open position, but a sufficient amount of mixed water can be secured due to dust clogging or the like. It is determined that there is a possibility of being in an incapable state, and processing for countermeasures is executed. As described above, first, the molten metal solenoid valve 91 is opened and converted to a trial flow to the bathtub 6 side, and if the detection above the determination temperature is resolved, it is determined that the temporary malfunction has been resolved, If a detection temperature equal to or higher than the determination temperature is generated again, it is possible to avoid a possibility that hot hot water flows to the hot water tap 51 side by executing error processing.

  When the pre-start process 2 is executed, the hot water supply path temperature monitoring process includes the basic process, that is, if a temperature equal to or higher than the determination temperature is continuously detected for a certain period of time, the hot water supply operation control is immediately performed. It is possible to execute error processing such as forcibly stopping. By executing the pre-start process 2, the hot water temperature in the pipe at the position of the hot water temperature sensor 54 is reliably maintained in a predetermined low temperature state in advance, so that the hot water temperature sensor 54 determines as described above during hot water execution. When a temperature equal to or higher than the temperature is detected, even if error processing is immediately executed, forced stop due to erroneous determination can be avoided. On the other hand, when the hot water supply path temperature monitoring process as shown in FIG. 7 is executed, the pre-start process 2 can be omitted. That is, when the hot water supply path temperature monitoring process as shown in FIG. 7 is executed, the temperature detected by the hot water supply temperature sensor 54 is further monitored after discharging to the bathtub 6 through the pouring channel 9 just in case. This is because it is possible to reliably avoid occurrence of inconvenience due to dust clogging and the like while avoiding forced stop due to erroneous determination.

  Further, the stepping motor that opens and closes the valve body of the bypass flow rate adjusting valve 81 is provided with a limiter at a predetermined open side position within the open / close range of the valve body, and the limiter is controlled by controlling the valve body at the open side position. A signal (position signal) may be output to the controller 10. In this case, as the pre-start process 1, the bypass flow rate adjustment valve 81 can be set to the open position instead of the fully open position. At this time, when the current position is unknown, for example, it is driven slightly to the closed side, or is driven to the open side position after driving to the fully closed position, and there is no limiter signal during this drive. It can be determined and confirmed that the state changes from the (non-output state) to a certain state (output state). In this case, although the amount of mixed water is slightly smaller than the fully opened position, a considerably large amount of mixed water is still ensured, so that the same effect as when the bypass flow rate adjusting valve 81 is set to the fully opened position can be obtained. it can. In this case, as the predetermined open side position, a predetermined opening position selected from a range from an intermediate position (for example, a central position) between the fully closed position and the fully open position to the fully open position can be set. .

DESCRIPTION OF SYMBOLS 1 Hot water heater 2 Can body 3 Water supply path 5 General hot water supply path 6 Bathtub 7 High temperature hot water supply path 8 Bypass path 51 Hot water tap 54 Hot water supply temperature sensor 81 Bypass flow control valve 91 Pouring solenoid valve 10 Controller (control means)
105 Hot water control unit (control means)
106 Pre-start processing unit

Claims (6)

A hot water supply passage for pouring hot water into the bathtub and a general hot water supply passage for supplying hot water to the hot water tap are branched at the hot water outlet side of the can body for receiving and heating water from the water supply passage, The passage is configured such that water can be mixed through the bypass passage branched from the water supply passage with respect to the hot water heated by the can body, and the bypass passage includes a bypass flow rate adjusting valve for changing and adjusting the water mixture ratio. In the water heater
Control means for performing high-temperature hot-water supply operation control for pouring a predetermined high-temperature hot water through the high-temperature hot-water supply passage,
The bypass flow rate adjusting valve is configured to change and adjust the opening degree of the valve body by drive control of the stepping motor, and to output a position signal to the control means when the valve body is in the fully open position,
The control means drives and controls the stepping motor to drive to the fully open position after driving the valve body of the bypass flow rate adjusting valve by a predetermined amount when there is a request for hot water supply operation, When the pre-start process for determining and detecting that the position signal has changed between the non-output state and the output state is executed, and the change cannot be detected by this pre-start process, Configured to not run hot water,
A water heater characterized by that. The water heater according to claim 1,
The control means determines whether or not a feed water flow rate equal to or higher than a predetermined flow rate is generated for the can when a request for hot water supply hot water operation is required, and detects the occurrence of a feed water flow rate equal to or higher than a predetermined flow rate. Is a water heater configured not to perform hot water supply to the high-temperature hot water supply channel. The water heater according to claim 1 or 2,
A hot water supply temperature sensor interposed in a general hot water supply path at a position downstream of the junction with the bypass path;
The control means monitors the temperature detected by the hot water supply temperature sensor during execution of hot water through the high temperature hot water supply passage by high temperature hot water supply operation control, and if a predetermined judgment temperature or more is detected, the high temperature hot water supply water passage is detected. A water heater, configured to forcibly stop running hot water through. The water heater according to claim 3,
A pouring passage for branching from a general hot water supply path located downstream of the hot water supply temperature sensor and pouring into a bathtub, and a pouring solenoid valve for opening and closing the pouring path,
When there is a request for hot water supply hot water operation, the control means temporarily converts the pouring solenoid valve to temporarily pour or pour low temperature hot water or water into the bathtub. Alternatively, hot water supply configured to execute hot water supply to the high temperature hot water supply passage after performing pre-start processing for filling the general hot water supply passage at the hot water supply temperature sensor position with low temperature hot water or water by pouring water vessel. A hot water supply passage for pouring hot water into the bathtub and a general hot water supply passage for supplying hot water to the hot water tap are branched at the hot water outlet side of the can body for receiving and heating water from the water supply passage, The passage is configured such that water can be mixed through the bypass passage branched from the water supply passage with respect to the hot water heated by the can body, and the bypass passage includes a bypass flow rate adjusting valve for changing and adjusting the water mixture ratio. In the water heater
A hot water supply temperature interposed between the control means for performing hot hot water hot water operation control for pouring predetermined high temperature hot water through the high temperature hot water supply path, and a general hot water supply path located downstream from the junction with the bypass path a sensor, e Preparations and pouring passage for pouring the bathtub branches from general hot water supply passage downstream position than the hot water temperature sensor, and a pouring solenoid valve for opening and closing switching this Chuyuro,
The bypass flow rate adjusting valve is configured such that the opening degree of the valve body is changed and adjusted by drive control of a stepping motor, and a position signal is output to the control means when the valve body is in a predetermined open position. And
Before SL control means, when a request for high temperature feed water operation, the drives and controls the stepping motor to the valve body of the bypass flow rate adjusting valve driving control until the predetermined open side position, the position signal is not Execute pre-start processing to determine and detect that there has been a change between the output state and the output state, and if the change cannot be detected by this pre-start processing, execute hot water for the high temperature hot water channel It is configured so as not to, in addition, during the execution of the pointing water through the hot feed molten metal passage by the high temperature feed water operation control, if prior Symbol predetermined judgment temperature or higher is detected by the hot water temperature sensor, the pouring If the solenoid valve is temporarily opened to temporarily pour water into the bathtub, and the molten water temperature sensor still detects the temperature above the predetermined judgment temperature, Hot spring fruit Forcibly that is configured to stop the,
Hot water supply device, characterized in that. The water heater according to claim 5 ,
Said predetermined open side position Ri fully open position der of the valve body, wherein, when a request for high temperature feed water operation, own the valve body of the bypass flow rate adjusting valve the stepping motor drive control to A water heater that is configured to drive and control to a fully open position after driving to a closed side only for a fixed amount .

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