JP2003269795A - Preheating water supply type hot water supply control method and preheating water supply type hot water supply system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a preheating water supply type hot water supply control method continuing a hot water supply operation even when there are something wrong or abnormal in temperature sensors. <P>SOLUTION: After hot water from a preheating water supply pipe 9 and cold water from a non-preheating water supply pipe 10 are variably mixed and controlled its temperature, the mixed water is allowed to enter in an inflow pipe 4, heated by a heat exchanger 2, and delivered to a hot water delivery pipe 6. When a hot water temperature sensor 13 and a cold water temperature sensor 14 used for controlling the temperature are broken down or abnormal, the hot water flow in the mixing control valve 7 is fully closed, the cold water flow is fully opened, and the hot water delivery control itself is continued based on an inflow temperature sensor 15. When the hot water temperature sensor and the inflow temperature sensor are broken down or abnormal, the hot water flow is fully closed, the cold water flow is fully opened, and the hot water delivery control itself is continued using the detection value of the cold water temperature sensor as the inflow temperature. When the hot water temperature sensor and the cold water temperature sensor are broken down or abnormal, the hot water delivery control may be continued, while continuously adjusting the temperature by increasing/decreasing the control mixing rate right before the breakdown according to the change in the detection value of the inflow temperature sensor. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention supplies not only ordinary cold water such as tap water to hot water supply equipment but also hot water preheated by using an external heat source, and mixing and adjusting both to adjust the temperature ( The present invention relates to a preheated water supply type hot water supply control method, a preheated water supply type hot water supply control device, and the like when water is supplied to a heating portion after temperature adjustment), and particularly hot water supply can be continued even if various detecting means fail.

[0002]

2. Description of the Related Art Conventionally, in order to use hot water heated by an external heat source such as a solar water heater for hot water supply, the hot water is supplied to a hot water supply device and auxiliary heating is performed by the hot water supply device before hot water supply. A system (for example, a water heater with a water supply preheating function) is known. That is, the energy required for heating in the water heater (fuel if combustion heating)
In order to save electricity, hot water that has been preheated is supplied to the hot water supply device (preheated water supply). In this system, normally, both cold water supply such as tap water (non-preheated water supply) and the above preheated water supply are received, and the temperature is controlled to a predetermined temperature by mixing them. Hot water discharge control is performed in which the hot water is poured into the heating unit and the hot water of the hot water supply temperature (set hot water temperature) desired by the user is discharged by the heating operation in the heating unit.

The temperature control described above detects both the temperature of the non-preheated feed water and the temperature of the preheated feed water and the temperature after the temperature control (after mixing) by temperature detecting means such as a thermistor, and based on these three detected temperatures. This is performed by controlling the mixing ratio of the non-preheated feed water and the preheated feed water so that the water temperature to be introduced into the heating section after temperature control falls within a predetermined temperature range. Further, in the above hot water discharge control, the hot water discharge temperature (hot water supply temperature) is set on the basis of the detected values of the water temperature (the temperature after the mixing) and the water flow rate of water entering the heating section, and the set hot water temperature. It is performed by controlling the heating operation (combustion operation in the case of combustion heating) so as to reach the tapping temperature.

Then, the temperature detecting means has a failure abnormality (for example, a failure such as a short or open of the thermistor).
When the above occurs, the temperature control is disabled and the hot water discharge control is disabled, so that the safety control for forcibly stopping the hot water supply operation itself is executed.

[0005]

However, in the above-mentioned conventional control, when a failure abnormality occurs in the detecting means, the hot water supply operation is stopped by the safety control. Therefore, the hot water supply is used until the failure abnormality is repaired. Will be impossible. For this reason, it is inconvenient for the user and has a difficulty in terms of usability.

The present invention has been made in view of such circumstances, and an object thereof is to supply hot water even if a failure abnormality occurs in the temperature detecting means for detecting basic data for control. A preheating water supply type hot water supply control method and a preheating water supply type hot water supply system capable of continuing operation.

[0007]

In order to achieve the above object, the present invention provides basic data of temperature control in the case of performing hot water discharge control when receiving mixed water temperature-controlled by temperature control. Even when a failure abnormality occurs in the temperature detecting means for detecting, the situation in which the hot water discharge control is disabled due to the temperature control uncontrollable is avoided, and the temperature control control mode is switched according to the failure abnormality, and the hot water is discharged. The control can be continued. Specifically, regarding the preheating water supply type hot water supply control method, when a failure abnormality occurs, the first invention in which the temperature control is switched so that only the non-preheated water supply is allowed to enter uniformly and the control responsiveness even if the failure abnormality occurs Inferiorly, there is a second invention that switches to continue temperature control anyway, and there are third and fourth inventions regarding a preheated water supply type hot water supply system to which these preheated water supply type hot water supply control methods are applied.

Specifically, in the first aspect of the invention, the temperature of the water entering the heating portion is adjusted to a predetermined temperature by controlling the mixing ratio of the two types of feed water, that is, preheated feed water and non-preheated feed water. While performing the temperature control, the mixed water temperature-controlled by this temperature control is introduced into the heating section, and the heating operation in the heating section for this entering water is controlled to control the heating operation in the heating section to perform the tapping control. The following specific items are provided for the preheating water supply type hot water supply control method. That is,
Any of first temperature detecting means for detecting the temperature of the preheated feed water, second temperature detecting means for detecting the temperature of the non-preheat feed water, and third temperature detecting means for detecting the mixed water temperature after mixing. When a failure abnormality occurs in any of the above, the water supply from the preheated water supply side is forcibly stopped and the mixture ratio control by the temperature control is switched so that only the water supply from the non-preheated water supply side enters the heating section. (Claim 1).

In the above temperature control, the mixture flow rate ratio is adjusted by adjusting the opening on the preheated water supply side and the opening on the non-preheated water supply side using a mixing adjustment valve to control the mixture ratio. Alternatively, the mixture ratio may be controlled by adjusting the respective openings of the two feed water flow rate adjusting valves provided in both the preheated feed water and non-preheated feed water supply pipes. Also,
When the temperature detecting means is composed of a thermistor, the resistance value output by the short or open failure of the thermistor becomes zero or infinity, or the temperature detecting means is generated. This is the case when the output signal from is out of the normal range or an abnormal value output is detected. These points are the same in the following second and third inventions.

According to the first aspect of the present invention, when a failure abnormality occurs in any of the first to third temperature detecting means, the control of the mixing ratio in the temperature control control fully closes the preheating feed water (mixing ratio 0%). )
Then, the non-preheated feed water is fully opened (mixing ratio 100%), and only the non-preheated feed water is switched to enter the heating section.
Therefore, in tap water control, normal water (non-preheated water supply)
The hot water discharge is continued by the control of heating only the heated hot water to a predetermined hot water temperature. That is, the hot water discharge control is performed using the detected value of the normal water temperature described above as the incoming water temperature in the hot water discharge control, not the detected value of the temperature of the mixed water in which the preheated supply water is mixed. This makes it possible to continue using hot water without interrupting the hot water supply operation.

As a concrete continuation method of the above hot water discharge control, for example, when the occurrence of the malfunction is one or both of the first and second temperature detecting means other than the third temperature detecting means, The hot water discharge control may be performed using the temperature detected by the third temperature detecting means as the incoming water temperature (claim 2). That is, if the third temperature detecting means for detecting the temperature of the mixed water after the temperature control is normal, the temperature of the non-preheated feed water after switching to only the non-preheated feed water is the third temperature.
Since the temperature is detected by the temperature detecting means, if hot water discharge control is performed using this detected temperature as the incoming water temperature, even if a failure abnormality occurs in the temperature detecting means, hot water can be discharged at the set hot water temperature as usual, and the hot water supply operation can be performed. It becomes possible to continue.

Alternatively, for example, when the occurrence of the failure abnormality is one or both of the first and third temperature detecting means other than the second temperature detecting means, the temperature detected by the second temperature detecting means is introduced. The hot water discharge control may be performed as the temperature (claim 3). That is, if the second temperature detecting means for detecting the temperature of the non-preheated feed water is normal, the temperature itself of the non-preheated feed water after being switched to only the non-preheated feed water is detected by the second temperature detection means. Therefore, if hot water discharge control is performed with the detected temperature as the incoming water temperature, hot water can be discharged at the set hot water temperature as usual even if a failure abnormality occurs in the temperature detecting means, and the hot water supply operation can be continued.

In the second aspect of the invention, temperature control is performed to control the temperature of the water entering the heating unit to a predetermined temperature by controlling the mixing ratio of the two types of preheated feed water and non-preheated feed water. On the other hand, the preheated water supply type hot water supply control in which the mixed water temperature-controlled by this temperature control is introduced into the heating section, and the heating operation in the heating section for this incoming water is controlled to bring out the hot water to a predetermined hot water temperature. The following specific items were prepared for the method. That is, of the first temperature detecting means for updating and storing the mixing ratio controlled by the temperature control and detecting the temperature of the preheated feed water, and the second temperature detecting means for detecting the temperature of the non-preheated feed water. When a failure abnormality occurs in either one or both of them, the mixing ratio stored before the failure abnormality occurs is increased / decreased and adjusted according to the change in the temperature detected by the third temperature detecting means for detecting the mixed water temperature after mixing. Thus, the temperature control is switched to continue the temperature control (claim 4).

In the second aspect of the present invention, the control mixture ratio by the temperature control is constantly updated and stored, and when a failure abnormality occurs in at least one of the first and second temperature detecting means, the third temperature detecting means. The temperature control is switched to the temperature control based on the above, and the temperature control is continued. That is, the temperature of the mixed water is stored by the third temperature detecting means before the failure abnormality occurs according to the change in the temperature of the mixed water after the mixing, and the mixing ratio is adjusted to decrease, thereby causing the temperature of the mixed water to fail. The temperature control is performed so that the temperature is kept constant at the previously detected temperature. Therefore, the followability (control responsiveness) of the temperature control may be slightly inferior to that before the occurrence of the failure abnormality, but the water supply to the heating unit using the preheated water supply is continued and the third temperature control is performed. The hot water discharge control in which the temperature detected by the detection means is the incoming water temperature makes it possible to accurately continue hot water discharge at a predetermined hot water temperature without interrupting the hot water supply operation.

In the above first and second inventions,
When the failure abnormality has occurred, the notification means may also notify that the failure abnormality has occurred (claim 5). By doing this,
While notifying the user that a malfunction has occurred in the temperature detection means and taking countermeasures against it, it is possible to continue using the hot water for the user until the malfunction is repaired, thus increasing convenience. It will be possible.

In the third aspect of the preheated water supply type hot water supply system, the hot water supply is configured so that the water supply to the upstream side of the water supply pipe is introduced into the heating section and the water is heated in the heating section to be discharged. The hot water supply unit is assumed to be connected to the upstream side of the water filling line of the device, which is connected with a preheated water supply unit that receives two kinds of water supply of preheated water supply and non-preheated water supply, mixes them with variable mixing ratio, and then supplies water. Is provided with a water inlet temperature detecting means for detecting the water inlet temperature from the water inlet pipe, and a hot water outlet control means for controlling the hot water outlet to a predetermined hot water temperature based on the water inlet temperature detected by the water inlet temperature detecting means. It is assumed that Further, the preheated water supply unit includes temperature control mixing means for mixing two kinds of water supply of the preheated water supply and the non-preheated water supply with a variable mixing ratio, and a first temperature detecting means for detecting the temperature of the preheated water supply.
A temperature detecting means and a second means for detecting the temperature of the non-preheated feed water
Mixing is performed by controlling the mixing ratio by the temperature detecting means, the third temperature detecting means for detecting the temperature of the mixed water after mixing, and the temperature adjusting and mixing means based on at least both the detected temperatures of the preheated feed water and the non-preheated feed water. Continuing the hot water discharge control when a failure abnormality occurs in any one of the temperature control means for controlling the temperature so that the temperature of the mixed water afterwards becomes a predetermined temperature and any one of the first to third temperature detecting means. An abnormal time control means for performing an abnormal time process for performing the operation is provided. Then, as the abnormal time control means, a configuration in which the mixing ratio control by the temperature control means is switched so that the water supply from the preheated water supply side is forcibly stopped and only the water supply from the non-preheated water supply side is supplied to the water inlet conduit. (Claim 6).

According to the third aspect of the present invention, the preheated water supply function for injecting the mixed water after temperature control using the preheated water supply can be imparted to the hot water supply device only by connecting the preheated water supply unit to the hot water supply device. It will be possible. Therefore, it is possible to easily attach the preheating water supply function even if it is installed in the factory in advance or installed in the existing water heater afterwards. Moreover, since the preheating water supply unit is provided with the abnormal temperature control means in addition to the temperature adjustment control means, a failure abnormality has occurred in the temperature detection means only on the side of the preheating water supply unit without modifying the original water heater. The control can be switched at this time, and the hot water supply operation in the hot water supply device can be continued. Then, the control method according to the first aspect of the invention is surely carried out by the processing by the abnormality control means when the failure abnormality occurs, and the action of the first aspect of the invention is surely obtained.

Further, the fourth aspect of the preheating water supply type hot water supply system
In the invention of, the water supply to the upstream side of the water inlet pipe to the heating portion, and the heating portion is heated in the heating portion to the hot water supply device configured to discharge hot water, the upstream side of the water filling line of the water heater, It is assumed that a preheating water supply unit that receives two types of preheated water supply and non-preheated water supply and mixes the water at a variable mixing ratio and then supplies the water is connected, and the hot water supply device detects the temperature of the water input from the water input conduit. The inlet water temperature detecting means and the outlet hot water control means for controlling the outlet hot water to reach a predetermined outlet water temperature based on the inlet water temperature detected by the inlet water temperature detecting means. Further, the preheating water supply unit includes temperature control mixing means for mixing the two types of water supply of the preheating water supply and the non-preheating water supply in a variable mixing ratio, a first temperature detecting means for detecting the temperature of the preheating water supply, Second temperature detecting means for detecting the temperature of the non-preheated feed water, third temperature detecting means for detecting the temperature of the mixed water after mixing, and the temperature adjusting and mixing means based on both the detected temperatures of the preheated feed water and the non-preheated feed water. Temperature control means for controlling the temperature of the mixed water after mixing to a predetermined temperature by controlling the mixing ratio according to, and storage means for storing and updating the mixing ratio controlled by the temperature control means. An abnormality control means for performing abnormality processing for continuing the hot water discharge control when a failure abnormality occurs in one or both of the first and second temperature detection means, To do. Then, as the abnormal time control means, increase / decrease adjustment of the mixing ratio stored by the storage means before the occurrence of the failure abnormality is performed according to the change in the temperature detected by the third temperature detection means or the incoming water temperature detection means. Thus, the temperature control by the temperature control means is continued (Claim 7).

According to the fourth aspect of the invention, as in the third aspect of the invention, the preheating water supply unit is simply connected to the hot water supply apparatus, and even if the water heater is installed in the factory in advance, the hot water supply apparatus is retrofitted to the existing water supply apparatus. It is also possible to easily add the preheating water supply function, and it is possible to switch the control when a failure abnormality occurs in the temperature detecting means only on the preheating water supply unit side without modifying the original water heater. It is possible to continue the hot water supply operation in the hot water supply device. Then, the control method according to the second aspect of the invention is reliably carried out by the processing by the abnormality control means upon occurrence of the failure abnormality, and the effect of the second aspect of the invention is surely obtained.

Furthermore, in each of the above-mentioned third and fourth inventions, an informing means is further provided, and the abnormal time control means is
It is also possible to add a configuration in which when the abnormality process is performed, the notification means also notifies that the failure abnormality has occurred (claim 8). By doing so, the user can be informed that a temperature abnormality has occurred in the temperature detection means and taken countermeasures, but the user can continue to use the hot water until the failure is repaired. It becomes possible to improve convenience.

[0021]

As described above, according to the preheating water supply type hot water supply control method according to any one of claims 1 to 3 or claim 5 belonging to the first invention, the first to third temperatures are provided. Even if a failure abnormality occurs in any of the detecting means, the hot water supply operation can be continued without interrupting the hot water supply operation by switching the temperature control.

In particular, according to Claim 2 or Claim 3, it is possible to specify a specific method as the hot water discharge control for continuing the use of the hot water supply, and as usual even if a failure abnormality occurs in the temperature detecting means. Hot water supply operation can be reliably continued by hot water discharge at a predetermined hot water temperature.

Claim 4 or Claim 5 belonging to the second invention
According to the preheating water supply type hot water supply control method described above, the temperature control is switched by the control method different from the first invention, even if a failure abnormality occurs in any of the first to third temperature detecting means. As a result, it is possible to continue using hot water without interrupting the hot water supply operation and still continue to enter the heating portion using the preheated water supply.

In particular, according to claim 5, in the above first and second inventions, when the failure abnormality occurs,
The notification means informs the user that a failure abnormality has occurred in the temperature detection means and takes countermeasures for it, while allowing the user to continue using hot water until the failure is repaired for convenience. Can be increased.

Claim 6 or claim 8 belonging to the third invention
According to the preheated water supply type hot water supply system, a preheated water supply function for injecting the mixed water after the temperature control using the preheated water supply into the hot water supply device is incorporated by simply connecting the preheated water supply unit to the hot water supply device in advance or by retrofitting. be able to. Moreover, the abnormal-time control means provided in the preheating water supply unit can switch the control when a failure abnormality occurs in the temperature detecting means only on the preheating water supply unit side without modifying the control part on the hot water supply device side. become able to. As a result, the effect of the first aspect of the present invention can be reliably obtained.

Claim 7 or claim 8 belonging to the fourth invention
According to the preheated water supply type hot water supply system of claim 6, similarly to claim 6, the preheated water supply unit is connected to the hot water supply device in advance or by retrofitting, and the mixed water after the temperature control using the preheated water supply to the hot water supply device is performed. A preheated water supply function for entering water can be incorporated. Moreover, the abnormal-time control means provided in the preheating water supply unit can switch the control when a failure abnormality occurs in the temperature detecting means only on the preheating water supply unit side without modifying the control part on the hot water supply device side. become able to. As a result, the effect of the second aspect of the invention can be reliably obtained.

In particular, according to claim 8, while notifying the user that a failure abnormality has occurred in the temperature detecting means and taking countermeasures against it, the user's hot water is supplied until the failure is repaired. It becomes possible to continue the use and improve convenience.

[0028]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

<First Embodiment> FIG. 1 shows a hot water supply apparatus 1 with a preheated water supply function, which is equipped with a preheated water supply type hot water supply control apparatus for carrying out the preheated water supply type hot water supply control method of the present invention.

This hot water supply apparatus 1 with a preheated water supply function has a heat exchanger 2 constituting a heating section, a combustion burner 3 for heating the heat exchanger 2 with combustion heat, and water to be heated for the heat exchanger 2. A water inlet conduit 4 for entering water and a hot water outlet conduit 6 for tapping hot water heated by the heat exchanger 2 toward a hot water tap 5.
And the mixing control valve 7 arranged at the upstream end of the water inlet pipe 4.
And a preheating water supply pipe line 9 connected to an external heat source (for example, a solar water heater) 8 for supplying hot water preheated by the external heat source 8 to the mixing control valve 7, and a water pipe connected to a water pipe or the like. A non-preheated water supply pipe line 10 for supplying water to the mixing control valve 7 is provided. Then, the feed flow rate of hot water (preheat feed water) from the preheat feed water pipe 9 and the feed water flow of cold water (non-preheat feed water) from the non-preheat feed water pipe 10 are set at a predetermined mixing ratio in the mixing control valve 7. Is controlled so that the mixed water whose temperature is adjusted to a predetermined temperature is introduced into the water inlet pipe line 4. In FIG. 1, reference numeral 11 is a bypass pipe, and 12 is a flow rate adjusting valve for adjusting the bypass flow rate through which the bypass pipe 11 passes.

A hot water temperature sensor 13 as first temperature detecting means for detecting the temperature of the hot water is provided in the preheating water supply line 9.
A cold water temperature sensor 14 as a second temperature detecting means for detecting the temperature of the cold water is interposed in the non-preheated water supply pipe line 10, and the mixing control valve 7 is installed in the water intake pipe line 4.
The water temperature sensor 15 as the third temperature detecting means for detecting the water temperature of the water mixed into the heat exchanger 2 and the water flow rate sensor 16 for detecting the water flow rate are installed. A hot water outlet temperature sensor 17 for detecting the hot water temperature of the hot water tap 5 heated by the heat exchanger 2 is provided in the hot water outlet pipe 6.
Each of the temperature sensors 13, 14, 15 and 17 is composed of a thermistor, and detects each temperature based on a change in each resistance value.

The mixing control valve 7 controls the mixing ratio for adjusting the temperature to a predetermined temperature, and the combustion burner 3 for discharging hot water at the set hot water temperature set by the user on the remote controller 18a, for example. The combustion control is controlled by the controller 18 including the preheated water supply type hot water supply control device.

As shown in FIG. 2, the controller 18 includes a temperature control unit 181 as a temperature control unit, an abnormal time control unit 182a as an abnormal time control unit, and a hot water control unit 183a as a hot water control unit. I have it. The temperature control unit 181 controls the mixing ratio of the mixing control valve 7 to control the temperature of water entering the water inlet conduit 4 to a predetermined temperature. The normal time control of the mixture ratio is FF (feed forward) control based on both the detected temperatures of the hot water temperature sensor 13 and the cold water temperature sensor 14, and FB in which the detected temperature of the incoming water temperature sensor 15 is also added to both detected temperatures.
(Feedback) control.

The abnormal condition control section 182a includes a hot water temperature sensor 13, a cold water temperature sensor 14, and an incoming water temperature sensor 15.
When the occurrence of a failure abnormality is detected in any of the above, in order to forcibly switch the normal control of the mixture ratio in the temperature control unit 181 and to notify the remote controller 18a as the notification means of the occurrence of the failure abnormality. The abnormal time processing of outputting the display signal of is performed. That is, in this abnormal time processing, the output signal (resistance value) from any one or more of the three temperature sensors 13, 14, 15 deviates extremely from the original normal sensor output range. When it is detected, it is determined that a failure abnormality has occurred, and the mixing ratio by the mixing control valve 7 is switched so that the preheating water supply conduit 9 side is fully closed and the non-preheating water supply conduit 10 side is fully opened. That is,
This is to uniformly switch the mixing ratio of 0% hot water to 100% cold water so as to supply only cold water to the water inlet pipe line 4, in other words, stop the temperature control by the temperature control unit 181. This is to switch to cold water only.

The hot water outlet control unit 183a controls the temperature of the hot water discharged by heat exchange heating in the heat exchanger 2 by the remote controller 18.
Hot water discharge control is performed to control the operation of the combustion system 19 including the combustion burner 3 and a fuel supply system (not shown) so that the set hot water temperature is set by a or the like. The normal hot water discharge control is FF control based on the detected water temperature detected by the water temperature sensor 15 and the detected water flow rate detected by the water flow rate sensor 17, and FB control in which the detected temperature of the hot water temperature sensor 17 is also added to both detection values. Done by. When the hot water after heating in the heat exchanger 2 is mixed with the water entering from the bypass pipe 11 by adjusting the opening degree of the flow rate adjusting valve 12, immediately after the hot water is discharged from the heat exchanger 2. Hot water discharge control is performed in consideration of the detected temperature from the can body temperature sensor 20 that detects the hot water discharge temperature and the like.

When the normal control of the mixture ratio by the temperature control unit 181 is switched by the abnormal condition processing by the abnormal condition control unit 182a, the hot water discharge control unit 183a receives the information signal and controls the hot water discharge. It is designed to switch and continue as follows. This hot water control unit 1
Switching of 83a is performed according to the following various cases.

That is, when the incoming water temperature sensor 15 is normal and one or both of the hot water temperature sensor 13 and the cold water temperature sensor 14 has a malfunction abnormality, the cold water temperature is normally detected by the incoming water temperature sensor 15. As in the normal hot water discharge control described above, the hot water discharge control is continued with the detected temperature detected by the hot water temperature sensor 15 as the detected hot water temperature. Further, when the cold water temperature sensor 14 is normal and one or both of the incoming water temperature sensor 15 and the hot water temperature sensor 13 has a malfunction abnormality, the cold water temperature is normally detected by the cold water temperature sensor 14, so that the above-mentioned normal operation is performed. In the hot water discharge control, the temperature detected by the cold water temperature sensor 14 is used as the detected water temperature, and the above hot water control is continued. Furthermore, when a failure abnormality occurs in all of the hot water temperature sensor 13, the cold water temperature sensor 14, and the incoming water temperature sensor 15, the temperature detected by the cold water temperature sensor 14 before the failure abnormality occurs is fixedly substituted as the detected incoming water temperature. The above-mentioned tapping control is continued.

According to the above, even if any of the hot water temperature sensor 13, the cold water temperature sensor 14 and the incoming water temperature sensor 15 has a failure abnormality, the normal hot water temperature control becomes impossible and the hot water discharge control is also performed. Unlike the conventional one in which the hot water supply operation itself is forcibly stopped because it becomes impossible, it is possible to continue the hot water supply control and continue the hot water supply operation. As a result, the hot water supply by the user can be continued and the convenience can be greatly improved. Moreover, since the failure abnormality occurrence is displayed on the remote controller 18a to notify the user in synchronization with the execution of the abnormality processing by the abnormality time control unit 182a, the user can be prompted to repair the failure abnormality. it can. And if the malfunction is fixed,
The temperature control unit 181 and the hot water discharge control unit 183a will each return to normal control.

<Second Embodiment> This second embodiment is the first embodiment as the contents of the abnormal time process of the abnormal time control unit 182a and the contents of the hot water discharge control at the time of executing the abnormal time process in the first embodiment. The content is different from the form. Only this point is different from the first embodiment, and other configurations are the same as those of the first embodiment. Therefore, only different points will be described in the following description.

That is, the abnormal time control unit 182b in the second embodiment is provided with a storage unit (not shown) as a storage means, and this storage unit sequentially outputs the mixing ratio in the normal control by the temperature control unit 181. I am supposed to update my memory. When a failure abnormality is detected in one or both of the hot water temperature sensor 13 and the cold water temperature sensor 14, the normal control of the mixing ratio in the temperature control controller 181 is switched and the remote controller 18a is controlled. Abnormality processing for outputting a display signal for notifying the occurrence of a failure abnormality is performed. In this abnormal condition processing, the control mixture ratio (immediately preceding mixture ratio) immediately before the failure abnormality occurs is read from the storage unit, and this immediately preceding mixture ratio is used as a change in the detected water temperature detected by the water temperature sensor 15 (detected water mixture temperature). The temperature control is continuously executed by changing and adjusting accordingly.
That is, the hot water supply is not stopped as in the first embodiment, but the hot water supply is continued to use the hot water. Specifically, if the detected water temperature rises from the value before the failure occurs, the flow rate of the cold water (the opening degree of the non-preheated water supply pipe 10 side) is correspondingly increased, while the detected water flow is increased. If the temperature becomes lower, the flow rate of hot water (opening on the side of the preheating water supply pipe 9) is relatively increased correspondingly so that the detected water temperature becomes constant at the value before the failure occurs. Change the mixing ratio immediately before.

Therefore, in this second embodiment, since the temperature control itself is continued, the hot water outlet control unit 183b in the second embodiment has a failure abnormality even if the abnormality control processing is executed by the abnormality control unit 182b. It is only necessary to continue the hot water discharge control at the same time as before the occurrence of the above, and it is not necessary to switch the hot water discharge control unlike the hot water discharge control unit 183a of the first embodiment. The normal hot water discharge control by the hot water discharge control unit 183b is the same as that described in the first embodiment.

Based on the above, even when a failure abnormality occurs in the hot water temperature sensor 13 or the cold water temperature sensor 14, as in the first embodiment, the conventional hot water supply operation itself is forcibly stopped. Unlike the above, as a result that the hot water discharge control can be continued, the hot water supply by the user can be continued and the convenience can be greatly improved, and further, the remote controller 18a displays a failure abnormality occurrence to notify the user of the failure abnormality. Can prompt repair. Then, if the failure abnormality is repaired, the temperature control unit 181 returns to the normal mixture ratio control. In addition, in the second embodiment, even if the above-mentioned malfunction occurs, the hot water supply from the preheating water supply pipe 9 can be used for entering the heat exchanger 2, and the fuel in the combustion burner 3 can be used. A reduction in consumption can be continuously obtained.

<Third Embodiment> FIG. 3 shows an example in which a preheating water supply function is additionally provided to a combined water heater having a bath reheating function and a hot water heating function as an embodiment of the preheating water supply type hot water supply system of the present invention. . In the third embodiment, a preheated water supply type hot water supply system is configured by connecting a preheated water supply unit 200 to the combined hot water supply device 100. In the combined hot water supply device 100 shown in the figure, 21 is a hot water supply circuit, 22 is a heating circuit, 23 is a reheating circuit, and 24
Is a controller that controls the operation of each of these circuits. A control part associated with the preheat water supply unit 200 is newly attached to the controller 24. In the composite hot water supply device 100, the hot water of the heating circuit 22 and the hot water of the reheating circuit 23 are added when the bath is heated. It is of a type in which hot water in the reheating circuit 23 is heated to perform reheating by performing heat exchange between the two. Less than,
Each of the main constituent elements 21, 22, 22 of the composite water heater 100
23 and 24 will be briefly described, and the preheating water supply unit 200 will be described in detail.

(Compound Hot Water Supply Device) The hot water supply circuit 21 supplies a hot water heat exchanger 31, a hot water supply combustion burner 32 disposed below the heat exchanger 31, and a fuel gas to the combustion burner 32. A fuel supply system 33 for hot water supply and a blower fan 34 for supplying combustion air to the combustion burner 32.
And a hot water supply inlet pipe 35 and a hot water outlet pipe 36 which are connected to the hot water heat exchanger 31 so as to communicate with each other.

Then, the upstream end 351 of the water inlet pipe 35
While the incoming water from the water is heated by the hot water supply combustion burner 32 while passing through the hot water supply heat exchanger 31, the hot water discharged through the hot water supply pipe 36 is supplied to the hot water tap 37 of the kitchen or the predetermined reheating circuit 23. It is designed to be supplied to the hot water supply area of. In the hot water supply water pipe 35, a water flow rate sensor 38 as a water flow rate detecting means for detecting a water flow rate into the hot water heat exchanger 31, and a water temperature sensor 39 as a water temperature detecting means for detecting a water temperature. The hot water supply pipe 36 for hot water supply is provided with a hot water temperature sensor 40 as a hot water temperature detecting means for detecting the hot water temperature. Each of the above temperature sensors is composed of a thermistor.

The heating circuit 22 includes the heating heat exchanger 41.
And a heating combustion burner 42 for heating the same, a heating fuel supply system 43 for supplying fuel gas to the combustion burner 42 from the same fuel source as the fuel supply system 33, and combustion air for the combustion burner 42. Blower fan 4 for heating to supply
4 and the heating circulation flow path 4 passing through the heating heat exchanger 41.
5 and.

The heating circulation passage 45 has an expansion tank 46 as a hot water storage tank interposed in the middle thereof, a heating water inlet pipe line 47 extending from the expansion tank 46 to the heating heat exchanger 41, and A heating hot water outlet pipe 48 extending from the heating heat exchanger 41 to the expansion tank 46 is provided. Water is supplied to the expansion tank 46 through a water injection conduit 49 branched from a preheated water supply conduit 72, which will be described later, and water is replenished. Further, a heating circulation pump 50 for circulating the hot water in the expansion tank 46 through the heating circulation passage 45 and the like is installed in the heating water inlet pipe 47, and the heating hot water outlet pipe 48 is provided with the heating circulation pump 50. The heat exchanger 56 for reheating, which will be described later, is arranged so as to pass therethrough.

An upstream end of a low temperature heating pipe 51 is branched and connected to an intermediate position of the heating water inlet pipe line 47, and is not shown in the drawing through a thermal valve 52 connected to a downstream end of the low temperature heating pipe 51. The low temperature water is supplied to the low temperature terminal radiator such as the floor heating radiation panel.

An upstream end of a high temperature heating pipe 53 is branched and connected to the heating hot water outlet pipe 48, and the high temperature heating pipe 53 is connected.
A circulation pipe to a high temperature terminal radiator (not shown) is connected to the downstream connection end 531 on the downstream side of the hot water to circulate and supply the high temperature water, and the low temperature water after heat radiation is connected to the upstream connection end 5 of the heating return pipe 54.
It is supposed to be returned from 41.

A hot valve 55 for bath is provided in the hot water outlet pipe 48, and the hot water in the hot water outlet pipe 48 is closed by closing the hot valve 55. By flowing only to 53 and opening, the hot water of the heating hot water outlet pipe 48 flows to the later-described reheating heat exchanger 56 and is circulated.

The reheating circuit 23 includes a reheating heat exchanger 56 and a reheating circulation channel 5 passing through the heat exchanger 56.
7, a reheating circulation pump 58 for circulating hot water through the circulation flow path 57, and a pouring pipe line 59 branched from the hot water supply pipe 36 for pouring hot water into the circulation flow line 57. ing.

The above-mentioned reheating circulation passage 57 is a bath return pipe 6 extending from a bath (not shown) to the reheating heat exchanger 56.
0, and a bath outflow pipe 61 extending from the reheating heat exchanger 56 to the bath. The circulating pump 57 is operated to circulate the hot and cold water in the bathtub with the reheating heat exchanger 56, and the reheating heating is performed by the heat exchange heating in the heat exchanger 56.

(Preheating Water Supply Unit) Preheating Water Supply Unit 2
00 is a mixing control valve 71, a preheating water supply pipe line 72 connected to one of the inlet side of the mixing control valve 71, a non-preheating water supply pipe line 73 connected to the other of the inlet side, and the above mixing. Mixed water supply pipe line 74 connected in communication with the outlet side of the control valve 71
And a connection pipe part 75 branched from the middle of the preheating water supply pipe 72 and connected to the water injection pipe 49.

A connection fitting 721 with a check valve is provided at the upstream end of the preheated water supply pipe 72, and a hot water temperature sensor 76 as a first temperature detecting means for detecting the temperature of hot water which is preheated water is provided on the way. Is provided. Similarly, a connection fitting 731 with a check valve is similarly provided at the upstream end of the non-preheated water supply pipe 73, and a cold water as a second temperature detecting means for detecting the temperature of the cold water which is the non-preheated water is provided on the way. A temperature sensor 77 is provided. Furthermore, the mixed water supply pipe 7
4, a mixing temperature sensor 78 as a third temperature detecting means for detecting the temperature of the mixed water is arranged. Each of the temperature sensors 76, 77, and 78 is composed of a thermistor as in the first embodiment, and detects the temperature based on the change in the output resistance value.

An external heat source similar to that of the first embodiment is connected to the connecting fitting 721, the hot water is supplied from the external heat source, and a water pipe or the like is connected to the connecting fitting 731 so that the cold water ( Tap water) is being supplied. In addition, the downstream end 741 of the mixed water supply pipe line 74
Is connected to the upstream end 351 of the water inlet pipe 35 of the hot water supply circuit 21.

(Controller) On the other hand, with the attachment of the preheated water supply unit 200 to the composite hot water supply apparatus 100, the unit side control device 201 (see FIG. 4) attached to the preheated water supply unit 200 is the original unit of the composite hot water supply apparatus 100. It is attached to the controller 24 equipped with the water heater control device 101. That is, the unit-side control device 201 includes a temperature control unit 202 as a temperature control unit,
An abnormal condition control unit 203a serving as an abnormal condition control means is provided, and the temperature control unit 202 controls the mixing ratio in the mixing control valve 71 to control the water supply temperature to the mixed water supply pipe line 74 to a predetermined temperature. It is designed to control the temperature. The normal control of the mixture ratio is FF (feed forward) control based on both the detected temperatures of the hot water temperature sensor 76 and the cold water temperature sensor 77, and FB (feedback) in which the detected temperature of the mixed temperature sensor 78 is also added in addition to both detected temperatures. Feedback) control is performed. In addition, when the abnormality control unit 103a detects the occurrence of a failure abnormality in any of the hot water temperature sensor 76, the cold water temperature sensor 77, and the mixing temperature sensor 78, the mixing ratio of the temperature adjustment control unit 202 is normal. The control is forcibly switched, and an abnormal condition process of outputting a display signal for notifying the remote controller 24a of the occurrence of a failure abnormality is performed.

In this abnormal condition processing, the output signal (resistance value) from any one or more of the three temperature sensors 76, 77, 78 described above extremely deviates from the original normal sensor output range. When it is detected, it is determined that a failure abnormality has occurred, and the mixing ratio by the mixing control valve 71 is switched so that the preheating water supply pipe line 72 side is fully closed and the non-preheating water supply pipe line 73 side is fully opened. In other words, 0% warm water: 100% cold water
The cold water is supplied only to the mixed water feed water 74 by uniformly changing the mixing ratio to the cold water. In other words, only the cold water is stopped by stopping the temperature control based on the normal time control by the temperature control controller 202. It is to switch to water supply.

The hot water supply apparatus side control device 101 uses the hot water supply circuit 21 as hot water discharge control means 1
02, a heating control unit using the heating circuit 22, and a reheating control unit using the reheating circuit 23. It should be noted that FIG. 4 shows only the hot water outlet control unit 102 in this.

The hot water supply control unit 102 burns the hot water on the hot water supply side so that the hot water discharged to the hot water supply pipe 36 by heat exchange heating in the hot water supply side heat exchanger 31 becomes the set hot water temperature set by the remote controller 24a or the like. Burner 32 and fuel supply system 33
Hot water discharge control is performed to control the operation of the combustion system 210 including the above. This hot water discharge control is performed by FF control based on the detected water temperature detected by the water temperature sensor 39 and the detected water flow rate from the water flow rate sensor 38, and FB control in which the detected temperature of the hot water temperature sensor 40 is also added to both detection values. Be seen. When the hot water after heating in the heat exchanger 31 is mixed with the incoming water from the bypass pipe and then the hot water is discharged, the hot water temperature immediately after the hot water is discharged from the heat exchanger 31 is detected and detected. Hot water discharge control is performed in consideration of the temperature.

In the case of this embodiment, the combined water heater 1
No. 00 hot water supply device side control device 101 is the combined hot water supply device 100
Is completed as the control for the unit of the preheating water supply unit 200.
Since it is assumed that No. 1 is newly attached, the combined water heater 100 side is provided with the incoming water temperature sensor 39, and the preheating water supply unit 200 side is also the same target as the above incoming water temperature sensor 39 (mixed water supply). The mixed temperature sensor 78 for detecting the temperature of 1) is provided redundantly. Then, in the unit side control device 201, the mixing temperature sensor 7
While using the temperature detected by 8, the water heater side controller 1
In 01, the temperature detected by the water temperature sensor 39 is used. Therefore, the mixed temperature sensor 78
When the preheating water supply unit 200 is configured by omitting the above, the hot water supply side control device 1 is connected to the unit side control device 201.
A signal acquisition terminal for reading the temperature detected by the water temperature sensor 39 from 01 may be provided.

According to the above, even when a failure abnormality occurs in one or more of the hot water temperature sensor 76, the cold water temperature sensor 77, and the mixed temperature sensor 78 on the side of the preheating water supply unit 200, a normal abnormality occurs. Hot water supply control on the side of the hot water supply device side control device 101 is different from the conventional one in which the temperature control is disabled and the hot water supply device side control device 101 is also unable to control the hot water supply process. Can be continued to continue the hot water supply operation. As a result, the hot water supply by the user can be continued and the convenience can be greatly improved. Moreover,
Since the failure abnormality occurrence is displayed on the remote controller 24a to notify the user in synchronization with the execution of the abnormality processing by the abnormality control unit 203a, the user can be prompted to repair the failure abnormality. Then, if the failure abnormality is repaired, the temperature control unit 202 returns to the normal control. In addition, the preheating water supply unit 2 does not have to include the control elements for achieving the above-described effects in the control device 101 of the combined water heater 100 in advance, and even if it is attached later.
It is possible to realize it by simply attaching the control device 201 of No. 00 to the controller 24.

<Fourth Embodiment> In this fourth embodiment, the contents of the abnormal time processing of the abnormal time control unit 203a in the third embodiment described above are different from those in the third embodiment. Only in this respect, unlike the third embodiment,
Since other configurations are the same as those of the third embodiment, only different points will be described below.

That is, the abnormal time control unit 203b in the fourth embodiment is provided with a storage unit (not shown) as a storage means, and this storage unit sequentially outputs the mixing ratio in the normal control by the temperature control unit 202. I am supposed to update my memory. When a failure abnormality is detected in one or more of the hot water temperature sensor 76, the cold water temperature sensor 77, and the mixing temperature sensor 78, the normal control of the mixing ratio in the temperature control unit 202 is performed. At the same time as switching, abnormal time processing for outputting a display signal for notifying the occurrence of a failure abnormality to the remote controller 24a is performed.

In the case of this abnormal condition processing, the control mixing ratio (immediate mixing ratio) immediately before the failure abnormality occurs is read from the storage unit, and the immediately preceding mixing ratio is changed and adjusted according to the change in the mixing temperature after mixing. Thus, the mixing temperature is controlled so as to be kept as constant as possible before the failure occurs. That is, if the mixing temperature becomes higher than the value before the occurrence of the failure, the mixing flow rate of the cold water in the mixing control valve 71 (the opening degree on the non-preheating water supply conduit 73 side) is relatively increased correspondingly, If the mixing temperature becomes low, the mixing flow rate of the warm water in the mixing control valve 71 (the opening degree on the side of the preheating water supply pipe 72) is relatively increased correspondingly.

Specifically, it is set whether the temperature detected by the mixing temperature sensor 78 or the temperature detected by the water temperature sensor 39 is used as the mixing temperature depending on the pattern of the failure abnormality. That is, when the failure abnormality occurs in one or both of the hot water temperature sensor 76 and the cold water temperature sensor 77 other than the mixed temperature sensor 78, the temperature detected by the mixed temperature sensor 78 is used as the mixed temperature to detect the above abnormal time. Perform processing. Further, when the occurrence of the failure abnormality also includes the mixed temperature sensor 78, the abnormal temperature process is performed by using the temperature detected by the water temperature sensor 39 (see the arrow indicated by the alternate long and short dash line in FIG. 4) as the mixed temperature. To do so. That is, in this case, the water temperature sensor 39
Is used as the third temperature detecting means.

Therefore, in the fourth embodiment, even if the temperature sensor 76, 77, 78 has a failure abnormality, the hot water supply control is different from the conventional one in which the hot water supply operation itself is forcedly stopped. As a result, the hot water supply by the user can be continued and the convenience can be greatly improved, as in the third embodiment. Furthermore, as in the second embodiment, even if a failure abnormality occurs, the temperature control itself can be continued. Therefore, the supply of hot water from the preheating water supply pipe line 72 should be used for entering the heat exchanger 31. Therefore, the fuel consumption of the combustion burner 32 can be continuously reduced. In addition, the control for this purpose is not incorporated in the control device 101 of the combined water heater 100 in advance, and the preheating water supply unit 200 can be installed even if it is installed later.
It can be realized only by attaching the control device 201 of 1 to the controller 24.

<Other Embodiments> In the above-described first to fourth embodiments, an example in which the mixing control valves 7 and 71 are used as the temperature adjusting and mixing means has been shown, but the present invention is not limited to this, and for example, the preheating water supply pipe line 9 is used. ，
72 and the non-preheated water supply pipes 10 and 73 are respectively provided with flow rate adjusting valves, and one set of flow rate adjusting valves is used as the temperature adjusting and mixing means to control the mixing ratio by changing and adjusting the combination of both flow rate adjustments. You may

In the third and fourth embodiments described above, an example was described in which the combined water heater 100 was used as the water heater to which the preheated water supply unit 200 was attached, but the present invention is not limited to this, and preheated water is used. A hot water supply system other than the combined hot water supply device 100 may be attached to the preheated water supply unit 200 to configure the preheated water supply type hot water supply system as long as the hot water supply is performed by using the hot water supply system.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing a preheating water supply type hot water supply apparatus to which the first and second embodiments of the present invention are applied.

FIG. 2 is a block diagram showing contents of a controller of the first and second embodiments.

FIG. 3 is a schematic diagram showing a preheating water supply type hot water supply system according to third and fourth embodiments.

FIG. 4 is a block diagram showing contents of a controller according to third and fourth embodiments.

[Explanation of symbols]

2,31 heat exchanger (heating part) 3,32 Combustion burner (heating part) 13,76 Hot water temperature sensor (first temperature detection means) 14,77 Cold water temperature sensor (second temperature detection means) 15 Water temperature sensor (third temperature detecting means) 78 Mixed temperature sensor (third temperature detecting means) 18a, 24a remote controller (informing means) 35 water line 39 Water temperature sensor (water temperature detection means) 7,71 Mixing control valve (temperature control mixing means) 100 combined water heater (hot water heater) 200 preheating water supply unit 102 Hot water discharge control unit (hot water control means) 181,202 Temperature control unit (temperature control means) 182a, 182b Abnormal control unit (abnormal control means) 183a, 183b Hot water discharge control unit (hot water control means) 203a, 203b Abnormal control unit (abnormal control means)

Claims (8)

[Claims] 1. A temperature control for controlling the temperature of the water entering the heating unit to a predetermined temperature by controlling the mixing ratio of two types of preheated feed water and non-preheated feed water. A preheating water supply type hot water supply control method for performing hot water discharge control in which mixed water whose temperature is controlled by the temperature control is introduced into the heating unit, and the heating operation in the heating unit for this water input is controlled to bring out the hot water to a predetermined hot water temperature. Of the first temperature detecting means for detecting the temperature of the preheated feed water, the second temperature detecting means for detecting the temperature of the non-preheat feed water, and the third temperature detecting means for detecting the mixed water temperature after mixing. When a failure abnormality occurs in any of them, the mixing ratio control by the temperature control is switched so that the water supply from the preheated water supply side is forcibly stopped and only the water supply from the non-preheated water supply side is allowed to enter the heating section. Characterized by Preheated water supply type hot water supply control method. 2. The preheating water supply type hot water supply control method according to claim 1, wherein the occurrence of the malfunction is one or both of the first and second temperature detection means other than the third temperature detection means. In the preheating water supply type hot water supply control method, the hot water supply control is performed by using the temperature detected by the third temperature detection means as the water inlet temperature. 3. The preheating water supply type hot water supply control method according to claim 1 or 2, wherein the failure abnormality is generated by both the first and third temperature detecting means other than the second temperature detecting means. A preheating water supply type hot water supply control method in which the hot water discharge control is performed using the temperature detected by the second temperature detection means as the incoming water temperature when either one or both of them. 4. The temperature control is performed to control the temperature of the water entering the heating unit to a predetermined temperature by controlling the mixing ratio of the two types of preheated feed water and non-preheated feed water. A preheating water supply type hot water supply control method for performing hot water discharge control in which mixed water whose temperature is controlled by the temperature control is introduced into the heating unit, and the heating operation in the heating unit for this water input is controlled to bring out the hot water to a predetermined hot water temperature. Which of the first temperature detecting means for updating and storing the mixing ratio controlled by the temperature control and detecting the temperature of the preheated feed water and the second temperature detecting means for detecting the temperature of the non-preheated feed water is performed. When a failure abnormality occurs in one or both of them, the mixing ratio stored before the failure abnormality occurs is increased / decreased and adjusted according to the change in the temperature detected by the third temperature detecting means for detecting the mixed water temperature after mixing. Switch temperature control to Preheating feedwater type hot water supply control method characterized by so as to continue the temperature control Te. 5. The preheating water supply type hot water supply control method according to any one of claims 1 to 4, wherein when the failure abnormality occurs, the notification means also notifies that the failure abnormality has occurred. Preheating water supply hot water control method. 6. An upstream side of a water filling line of a hot water supply device configured to feed water supplied to an upstream side of a water inlet pipe to a heating unit and heat the water inlet at the heating unit to discharge hot water. A preheating water supply unit that receives two types of water, preheated water supply and non-preheated water supply, mixes the water with a variable mixing ratio and then supplies the water, is connected to the hot water supply device, and the hot water supply device detects the water input temperature from the water intake pipe. The preheated water supply unit includes a temperature detection means and a hot water discharge control means for controlling hot water discharge to a predetermined hot water discharge temperature based on the water temperature detected by the water temperature detection means, and the preheated water supply unit includes the preheated water supply and the non-preheated water supply. And temperature control mixing means for mixing two types of feed water in a variable mixing ratio, first temperature detecting means for detecting the temperature of the preheated feed water, and second temperature detecting means for detecting the temperature of the non-preheat feed water. The temperature of the mixed water after mixing By controlling the mixing ratio by the temperature adjusting and mixing means based on both the third temperature detecting means to be output and at least the detected temperatures of the preheated feed water and the non-preheated feed water, the temperature of the mixed water after mixing becomes a predetermined temperature. Abnormality control means for controlling temperature control and abnormal time control means for performing abnormal time processing for continuing the hot water discharge control when a failure abnormality occurs in any of the first to third temperature detection means And the abnormal time control means forcibly stops the water supply from the preheated water supply side and controls the mixing ratio control by the temperature control means so that only the water supply from the non-preheated water supply side is supplied to the water inlet conduit. A preheating water supply type hot water supply system characterized by being configured to be switched. 7. An upstream side of a water filling line of a hot water supply device configured to feed water to the upstream side of the water inlet pipe to a heating unit and heat the water inlet at the heating unit to discharge hot water. A preheating water supply unit that receives two types of water, preheated water supply and non-preheated water supply, mixes the water with a variable mixing ratio and then supplies the water, is connected to the hot water supply device, and the hot water supply device detects the water input temperature from the water intake pipe. The preheated water supply unit includes a temperature detection means and a hot water discharge control means for controlling hot water discharge to a predetermined hot water discharge temperature based on the water temperature detected by the water temperature detection means, and the preheated water supply unit includes the preheated water supply and the non-preheated water supply. And temperature control mixing means for mixing two types of feed water in a variable mixing ratio, first temperature detecting means for detecting the temperature of the preheated feed water, and second temperature detecting means for detecting the temperature of the non-preheat feed water. The temperature of the mixed water after mixing By controlling the mixing ratio of the temperature-controlled mixing means based on both the third temperature detecting means to be output and the detected temperatures of the preheated feed water and the non-preheated feed water, the temperature of the mixed water after mixing becomes a predetermined temperature. Failure abnormality in one or both of the temperature control means for controlling the temperature, the storage means for storing and updating the mixture ratio controlled by the temperature control means, and both of the first and second temperature detecting means. And an abnormal time control means for performing an abnormal time process for continuing the hot water discharge control when the occurrence of the above occurs, the abnormal time control means is provided for detecting the temperature detected by the third temperature detecting means or the incoming water temperature detecting means. The preheating supply is characterized in that the temperature control by the temperature control means is continued by increasing / decreasing and adjusting the mixing ratio stored by the storage means before occurrence of a failure abnormality according to the change. Equation hot water supply system. 8. The preheating water supply type hot water supply system according to claim 6 or 7, further comprising: an alarm means, wherein the abnormal time control means causes an abnormal failure by the alarm means when performing abnormal time processing. A preheating water supply type hot water supply system that is configured to also notify that it has been done.