JPH10325558A - Auxiliary hot water supplying apparatus side hot water supply stop judging method for hot water supplying device having auxiliary hot water supplying apparatus, and hot water supplying device having auxiliary hot water supplying apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stably operate a main hot water supplying device by accurately and quickly detecting the stop of a hot water supply from an auxiliary hot water supplying apparatus. SOLUTION: In an auxiliary hot water supplying apparatus connecting unit C which connects a main hot water supplying apparatus A and a solar hot water supplying apparatus B, a mixing-adjusting valve 61 which mixes hot water supplied from the solar hot water supplying apparatus B with water supplied from a water source through a water supplying passage 80, and feeds to the main hot water supplying apparatus A, is provided. Then, the stop of a hot water supply from the solar hot water supplying apparatus B to the mixing-adjusting valve 61 is judged by monitoring the variation of a water discharging amount of the mixing- adjusting valve 61. In concrete, the on/off cycle of a minimum operation water amount detecting signal of the main hot water supplying apparatus A is monitored, and the on/off cicle of a minimum operation water amount detecting signal which is generated when a hot water supply from the solar hot water supplying apparatus B is stopped is detected, and thus, the stop of a hot water supply from the solar hot water supplying apparatus B is judged.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for judging stop of hot water supply on an auxiliary water heater side of a water heater with an auxiliary water heater and a water heater with an auxiliary water heater. The present invention relates to a technique for determining the stop of hot water supply on the auxiliary water heater by monitoring the amount of water, and a control operation at the time of stopping hot water supply from the auxiliary water heater.

[0002]

2. Description of the Related Art A hot water supply device with a solar hot water supply function in which a solar water heater (auxiliary water heater) is connected to a main water heater (main water heater) so that hot water from the solar water heater can be used as needed. (Hot water supply device with auxiliary water heater) has been conventionally provided.

In this type of water heater with a solar water heater, a main water heater and a solar water heater are connected via a solar water heater connection unit (auxiliary water heater connection unit), and the solar water heater is connected to the main water heater. The supplied hot water is supplied to a main water heater by adjusting the flow rate and the mixing ratio with water by an on-off valve and a mixing valve provided in the solar hot water supply connection unit.

[0004]

However, such a conventional hot water supply device having an auxiliary water heater has the following problems.

(1) In this type of hot water supply apparatus with a solar hot water supply function, for example, in winter when the temperature drops, the piping on the solar hot water supply side may freeze. The hot water supply sometimes stopped. The stop of the hot water supply from such a solar water heater is not limited to the case of the above-mentioned freezing of the pipe, but also occurs, for example, due to a failure of an opening / closing valve provided in the solar water heater connection unit. When the operation of the hot water supply apparatus is started in a state where the hot water supply is stopped, hot water supply from a hot water tap such as a curan causes hunting and becomes intermittent.

[0006] When the hot water supply apparatus starts hot water supply operation, as an initial operation, the mixing valve of the solar hot water supply connection unit first opens a water supply channel side (hereinafter referred to as "water side") connected to a water source such as a water supply system. In this state, the operation is started in the solar water heater side (hereinafter, referred to as “solar side”) in a fully closed state. Then, in order to raise the temperature of the water supplied to the main water heater by the mixing valve to the hot water supply set temperature, control is performed so as to open the solar-side valve and close the water-side valve. However, even if such control is performed, in a state where the hot water supply from the solar water heater is stopped, hot water is not supplied from the solar water heater even when the solar side of the mixing valve is opened, so that the main hot water supply from the mixing valve is not performed. The temperature of the water supplied to the main water heater does not increase, only the amount of water supplied to the water heater decreases. Therefore, in the mixing valve, the solar-side valve is opened and the water-side valve is controlled to be more and more closed, so that the water from the mixing valve is finally eliminated. Therefore, the main water heater becomes less than the minimum working water volume, and the mixing valve is once in the initial state (water side "open", solar side "fully closed")
Return. Thereafter, the mixing valve starts the above-described control operation again. However, as in the above-mentioned case, since water does not eventually flow out of the mixing valve, such operation is repeated thereafter, and the hot water supply from the hot-water tap is intermittent. Becomes

[0007] As described above, when the hot water supply from the solar water heater is stopped due to freezing of the piping or failure of the on-off valve, the hot water supply operation of the water heater becomes unstable.

(2) In connection with this, conventionally, as a measure against freezing of pipes, water supplied from a water source to a solar water heater is directly supplied to a main water heater only during a winter season when pipes may be frozen in advance. A device provided with a bypass pipe for supply has been proposed. This bypass pipe is provided with an on-off valve (so-called season valve) that is opened only during the winter season when freezing is expected. Since the operation of the season valve is required for the elderly, the operation is troublesome, and improvement thereof has been desired.

The present invention has been proposed in view of such a problem, and an auxiliary water heater capable of quickly and accurately detecting a stop of hot water supply from a solar water heater and stably operating a main water heater. It is an object of the present invention to provide a method for determining the stop of side hot water supply and a hot water supply device with an auxiliary hot water heater.

[0010]

Means for Solving the Problems In order to achieve the above object, the invention according to claim 1 comprises a main water heater, an auxiliary water heater for supplying hot water to the main water heater, and the main water heater. An auxiliary water heater connection unit for mixing hot water supplied from the auxiliary water heater interposed between the water heater and the auxiliary water heater with water from a water source and supplying the mixed water to the main water heater; An on-off valve capable of shutting off hot water supplied from the auxiliary water heater through the auxiliary hot water supply path, and a hot water supplied from the auxiliary water heater and a water source supplied to the downstream side of the on-off valve via the water supply path. With a supplementary water heater comprising: a mixing control valve for mixing and adjusting the water to be supplied to the water inlet of the main water heater, and an auxiliary water heater connection controller for controlling the mixing operation of hot water and water by the mixing control valve. In the water heater, the water output from the mixing control valve is monitored. And, and judging that the hot water supply from the auxiliary water heater when the fluctuations of the output water was repeated stopped.

That is, the invention according to claim 1 is:
If the hot water supply from the auxiliary water heater stops due to pipe freezing or a malfunction of the on-off valve, the water flow from the mixing control valve will be intermittent as described above. Is to determine the stop of hot water supply from the auxiliary water heater. According to actual measurements by the applicant,
Such intermittent water discharge varies depending on the type of the hot water supply device and the like, but if the same type of hot water supply device is used, it is regularly repeated at a certain fixed period, for example, about 10 seconds to 30 seconds. Etc. can be detected as different from the case where the hot water tap is repeatedly opened and closed. That is, the first aspect of the present invention determines the stop of hot water supply on the auxiliary water heater side by detecting such an intermittent repetition cycle of the water discharge amount of the mixing control valve.

Further, the invention according to claim 2 is characterized in that the monitoring of the amount of water discharged from the mixing control valve is performed by monitoring the on / off cycle of a minimum operating water amount detection signal of the main water heater. That is, in the auxiliary water heater connection unit in which the mixing control valve is disposed, although the temperature sensor for detecting the water temperature on the water discharge side of the mixing control valve is usually provided, the water amount sensor for detecting the water discharge amount on the water discharge side is not provided. In general, the intermittent water discharge cycle as described above is detected by an on / off cycle of a minimum operation water amount detection signal which is turned on when the minimum operation water amount is detected in the main water heater. .

A third aspect of the present invention is a more specific version of the second aspect of the present invention. In monitoring the on / off cycle of the minimum operating water amount detection signal,
A step of determining whether or not the off-period is performed within a predetermined time; a step of storing the period information as the minimum operating water amount detection signal data if the period is within the predetermined time; Comparing the working water amount detection signal data with the previously detected minimum working water amount detection signal data to determine whether the difference is equal to or less than a predetermined value; and It is characterized by comprising a step of counting an error counter and a step of judging that the hot water supply from the auxiliary water heater has stopped when the error counter has reached a predetermined number.

[0014] This is because when the water output from the mixing control valve is intermittent, the minimum operating water amount detection signal of the main water heater also intermittently repeats on / off. When turning on / off, first, a step is provided for determining whether or not the on / off cycle is within the same cycle as the repetition cycle that occurs when the hot water supply from the auxiliary water heater is stopped. If this is the case, the time of the cycle is stored as the minimum working water detection signal data, and the stored minimum working water detection signal data is compared with the previously detected minimum working water detection signal data to determine the difference between the two cycles. Is determined, and whether the deviation is small enough to determine a repetition period based on the same cause (within a predetermined value) or not is determined. If the deviation is equal to or smaller than a predetermined value, an error counter is counted. Te, when the count of the error counter reaches a predetermined number of times (i.e., when detected continuously) in which it is determined that the hot water supply is stopped from the auxiliary water heater to. In other words, according to the third aspect, when the minimum operating water amount detection signal is turned on / off, a signal which is considered to be caused by the stoppage of the hot water supply from the auxiliary water heater is selected from the on / off signals. By comparing with what was done,
It is determined whether the ON / OFF of the minimum operating water amount detection signal is in the same cycle as that of the previous operation. Is to judge.

According to a fourth aspect of the present invention, in monitoring the ON / OFF cycle of the minimum operating water amount detection signal, it is determined whether or not the ON / OFF cycle has been performed within a predetermined time. Storing the cycle information as the minimum operating water amount detection signal data when the time is within the predetermined time, and adding the stored minimum operating water amount detection signal data and the past minimum operating water amount detection signal data to obtain a minimum. Calculating the operation water amount detection signal addition data;
Comparing the calculated minimum working water amount detection signal addition data with reference data set in advance to determine whether or not the difference is equal to or less than a predetermined value; and the difference between the cycles is equal to or less than a predetermined value. In this case, the method comprises a step of counting an error counter and a step of determining that the hot water supply from the auxiliary water heater has stopped when the error counter has reached a predetermined number.

That is, the invention according to claim 4 provides:
For example, when an element such as a pressure pump is interposed between the auxiliary water heater connection unit and the main water heater, the ON / OFF cycle of the minimum operating water amount detection signal of the main water heater is determined by an intermediate pressure pump or the like. In this case, hunting on the water outlet side of the mixing control valve cannot be accurately detected even if the detected minimum operating water amount detection signal data is compared with the previous minimum operating water amount detection signal data. . Therefore, in the invention of claim 4, in order to absorb such a delay of the on / off cycle, several times of the past minimum operation water amount detection data are combined (added) and the minimum operation water amount detection signal addition data is added. In addition, the minimum working water amount detection signal addition data is compared with reference data set in advance according to the number of additions to determine whether or not the same cycle is repeated. If it is determined that the same cycle is repeated, it is determined that the hot water supply from the auxiliary water heater is stopped when the repetition reaches a predetermined number.

According to a fifth aspect of the present invention, in monitoring the on / off cycle of the minimum operating water amount detection signal, it is determined whether or not the on / off cycle has been performed within a predetermined time, and the cycle is determined. Storing the cycle information as the minimum operating water amount detection signal data when the time is within the predetermined time, and comparing the stored minimum operating water amount detection signal data with the previously detected minimum operating water amount detection signal data. Determining whether the difference is equal to or less than a predetermined value, and comparing the water inlet water temperature and the outlet water temperature of the mixing control valve when the difference between the cycles is equal to or less than the predetermined value. A step of determining whether or not the temperature difference is within a predetermined value; a step of counting an error counter when the temperature difference is within a predetermined value; Hot water supply from the auxiliary water heater characterized by comprising the step of determining to be stopped.

That is, according to the fifth aspect of the present invention, up to the point where the minimum operating water amount detection signal data is compared with the previously detected data, it is the same as the third aspect of the present invention. Thereafter, a step of comparing the water inlet water temperature and the outlet water temperature of the mixing control valve to determine whether or not the temperature difference is within a predetermined value is added. This is because when the supply of hot water from the auxiliary water heater is stopped, hot water is not supplied to the mixing control valve, so that a temperature change occurs between the water inlet temperature and the outlet water temperature of the mixing control valve. Therefore, this point is added as a condition for determining the stop of hot water supply from the auxiliary water heater. Therefore, according to the fifth aspect of the present invention, it is possible to more accurately determine the stop of the hot water supply than in the case of the third or fourth aspect.

According to a sixth aspect of the present invention, there is provided the auxiliary hot water supply side hot water supply stop judging method according to any one of the first to fifth aspects, wherein the auxiliary hot water supply side hot water supply stop determination is performed before the judgment of the auxiliary hot water supply side hot water supply stop. A step is provided for determining whether or not the water inlet water temperature of the mixing control valve has reached a predetermined temperature. Depending on the result of the determination, different auxiliary values having different set values in each step of the auxiliary hot water supply side hot water supply stop determination method are provided. The method is characterized by selecting and using a hot water supply side hot water supply stop determination method.

That is, in the invention according to claim 6, prior to the determination of the stop of hot water supply from the auxiliary water heater, the step of determining whether or not the water inlet water temperature of the mixing control valve has reached a predetermined temperature. With this provision, for example, when the inlet water temperature is low and the possibility of freezing of the pipe on the auxiliary water heater side is high, the freezing of the pipe is discovered earlier by setting the number of times of the error counter to be smaller than the normal case. It is possible to do.

According to a seventh aspect of the present invention, there is provided a water heater with an auxiliary water heater, wherein the hot water supply from the auxiliary water heater is determined by the auxiliary water heater side hot water supply stop judging method according to any one of the first to fifth aspects. When the supply is determined to be stopped, a control structure is provided for fixing the mixing control valve by opening the water side. Therefore, in the water heater with the auxiliary water heater according to claim 7, even if the supply of hot water from the auxiliary water heater is stopped, the water side of the mixing control valve is fixed in an open state, so that the water of the mixing control valve is discharged. Hot water can be supplied stably without being intermittent.

An eighth aspect of the present invention provides a method for judging a stop of hot water supply from an auxiliary water heater by the auxiliary hot water supply side hot water supply stop judging method according to any one of the first to fifth aspects. The mixing control valve is characterized in that the mixing control valve is fixed with the water side opened and an alarm display request signal is sent to an external alarm means. Therefore, according to the invention as set forth in claim 8, when the supply of hot water from the auxiliary water heater is stopped, the apparatus user can immediately recognize the stop of the hot water supply from the auxiliary water heater, and the piping can be frozen or opened and closed. Necessary measures can be taken promptly for a valve failure.

According to a ninth aspect of the present invention, there is provided a hot water supply apparatus with an auxiliary hot water supply device, wherein the auxiliary hot water supply side hot water supply stop determination method according to any one of the first to fifth aspects described above,
If it is determined that the hot water supply from the auxiliary water heater is stopped, the water side of the mixing control valve is opened and fixed, and a second error counter is counted. When the number of times has reached the number of times, it is finally determined that the supply of hot water from the auxiliary water heater has stopped, and an alarm display request signal is sent to an external alarm means, and the second error counter does not reach the predetermined number of times. And a control structure for releasing a fixed state in which the water side of the mixing control valve is opened when the minimum operating water amount detection signal is turned off.

That is, the invention according to claim 9 provides:
First, when it is determined that the hot water supply from the auxiliary water heater is stopped, the mixing control valve is fixed at the water side open to stabilize the water flow from the mixing control valve, and an alarm display request is issued until the second error counter reaches a predetermined number. No signal is sent. When the minimum operating water amount detection signal is turned off in a state where the second error counter does not reach the predetermined number of times, the fixing of the mixing control valve on the water side is released to return to the normal operation. Has adopted. This is because in the case of pipe freeze in winter, the minimum working water detection signal is turned off before finally determining the stop of hot water supply from the auxiliary water heater, because the pipe may freeze during the night but melt during the day. In this case, by returning to the normal operation, the auxiliary water heater can be used during the day, and the determination of the stop of the hot water supply from the auxiliary water heater side is performed in two stages. Judgment becomes possible.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a method for judging stop of hot water supply on the auxiliary water heater side and a water heater with auxiliary water heater in the water heater with auxiliary water heater according to the present invention will be specifically described below with reference to the drawings.

Embodiment 1 FIG. 1 shows an overall configuration of a hot water supply device with a solar hot water supply function (a hot water supply device with an auxiliary water heater) according to the present invention, in which a main water heater A and a solar water heater (auxiliary water heater) are shown. B and a solar water heater connection unit (auxiliary water heater connection unit) C as main parts.

The main water heater A mainly heats the hot water supplied from the solar hot water supply connection unit C to the hot water supply set temperature as needed and supplies the hot water to the hot water supply curn 22b, the bathtub 44 and the like. It has a water inlet 21 and a hot water outlet 22 connected to the heat exchange can 10 and a main controller 30 for controlling the main water heater A as a main part. The heat exchange can 10 of the main water heater A is an instantaneous heat exchange can and includes a burner 11 and a finned heat exchanger in which the water inlet 21 and the outlet 22 are connected. An exchange coil 23 is provided,
The hot water supply circuit 20 is constituted by the water inlet 21, the hot water outlet 22, and the heat exchange coil 23.

The water supply passage 21 of the hot water supply circuit 20 is provided with a pump 21a, a water flow switch 21b, a water amount sensor 21c, and a water temperature sensor 21d. A tapping temperature sensor 22a is provided in tapping path 22 of hot water supply circuit 20, and a tapping water curn 22b is provided at an end of tapping path 22. In addition, a bypass 24 having a control valve 24a is provided from the water inlet 21 to the hot water outlet 22 to finely adjust the temperature of the hot water flowing out of the hot water supply curn 22b.

The hot water supply path 22 is provided with a bath drop-off path 25 for supplying hot water to a bathtub 44. The bath drop-off path 25 is provided with a drop-off opening / closing valve 25a. A bath reheating circuit 40 for reheating the hot water (bath water) in the bathtub 44 is connected to the heat exchange can 10. The bath reheating circuit 40 includes a forward path 41 for transporting the bath water heated from the heat exchange can 10 to the bath 44, a return path 42 for returning the bath water from the bath 44 to the heat exchange can 10, Can 10
And a heat exchange coil 43 for performing heat exchange and heating of bathtub water inside the bath.
The hopper receiving part 41 which receives the hot water dropped from 5
a and a three-way switching valve 41b. further,
The return path 42 is provided with a circulation pump 42a, a bath temperature sensor 42b, and a water flow switch 42c.

The main controller 30 inputs information from the sensors of the main water heater A and a command from the remote controller 50 to control the operation of the main water heater A and determine whether to stop the hot water supply from a solar water heater described later. To do
It is composed of a microcomputer. The main controller 30 is a known communication means such as a modem so that the main controller 30 can communicate with the remote controller 50 and with a solar hot water supply connection controller (auxiliary hot water supply connection controller) 60 of the solar hot water connection unit C described later. And mutually exchange information between them. The main controller 30, the remote controller 50, and a solar hot water connection controller 60 of a solar hot water connection unit C described later.
Are connected by wires via communication transmission lines 101 and 102, and can communicate in both directions.

The solar hot water supply connection unit C is for connecting a solar hot water supply path 70 from the solar hot water supply B to the main hot water supply A side, and includes a mixing control valve 61 in addition to the solar hot water supply connection controller 60. Have. The mixing control valve 61 has a solar hot water supply path 7 from the solar hot water heater B.
0 is connected to a water supply passage 80 from a water source such as a water supply, and the water supply passage 21 extends from the mixing control valve 61 to the main water heater A. More specifically, the solar hot water supply connection unit C has a connection port (solar hot water supply) for connecting the solar hot water supply path 70, the water supply path 80, and the piping of the water inlet path 21 of the main water heater A to the unit C. A water inlet 91, a water supply port 92, and a water outlet 93) are provided, and the pipes constituting the solar hot water supply path 70 and the like are connected to these connection ports by connection means (not shown) such as a pipe joint. ing. Note that 94, 95 shown in FIG.
Indicates a water inlet on the main water heater A side and a water outlet on the solar water heater B side, respectively.

Then, the solar hot water connection unit C
An on-off valve 62 constituted by an electromagnetic on-off valve or the like is provided in the solar hot water supply path 70, and the hot water from the solar water heater B can be shut off by fully closing the on-off valve 62. I have.

The solar hot water supply path 70 is provided with a solar hot water temperature sensor 63 for detecting the temperature of the hot water supplied from the solar water heater B. A water supply temperature sensor 64 for detecting the temperature of water supplied from a water source is provided.
Is provided with a hot water temperature sensor 65 for detecting the temperature of the water flowing out of the mixing control valve 61. The temperature information detected by these temperature sensors 63, 64, 65 is input to the solar hot water supply connection controller 60.

The solar hot water supply connection controller 60 controls the operation of the solar hot water connection unit C, and comprises a microcomputer.
A known communication means such as a modem is provided so as to be able to communicate with the main controller 30 and the like. The mixing ratio of the mixing control valve 61 is adjusted based on information such as the detected temperature information and the control information received from the main controller 30, and the opening and closing operation of the on-off valve 62 can be controlled. In addition, the solar hot water supply connection controller 60 includes a storage unit such as a RAM for storing minimum operating water amount detection data (not shown), which will be described later.

On the other hand, the solar water heater B is a device for supplying hot water using solar heat and has a known structure. That is, it has a solar heat exchanger 71, a hot water storage tank 72, and the like in addition to the solar hot water supply path 70, and a part of the water supply path 80 is branched and connected to the hot water storage tank 72. A hot water supply path 70 extends. And the solar heat exchanger 7
The medium heated in 1 is introduced into the hot water storage tank 72 and heat exchange heats the water in the hot water storage tank 72 to generate hot water. The hot water in the hot water storage tank 72 passes through the solar hot water supply path 70 and is connected to the solar hot water supply connection unit. C.

Next, the basic hot water supply operation of the hot water supply apparatus with the solar hot water supply function configured as described above will be described first with reference to the flowchart of FIG. 2, and thereafter, the hot water supply stop on the auxiliary hot water supply side according to the present invention will be described. The determination method will be described.

A. Basic supply of hot water supply equipment with solar hot water supply function
Hot water operation: (1) First, after confirming that the power of the main water heater A and the solar water heater B is turned on, the power supply (not shown) of the solar water heater connection unit C is turned on to operate the solar water heater connection unit C. In a possible state, and the remote control 5
0 is turned on (step S in FIG. 2)
1). Thereby, based on the instruction of remote controller 50, the hot water supply operation switch on information and the hot water supply set temperature information are communicated from main controller 30 to solar hot water supply connection controller 60.

(2) At this time, the on-off valve 62 for shutting off the flow of water from the solar water heater B is in a fully closed state, and the mixing control valve 61 is in a fully open state on the water side (water supply passage 80 side). Therefore, at this time, the mixing operation of the solar hot water and the water by the mixing control valve 61 is not performed at this time.

(3) Then, the user of the apparatus opens the hot water supply curan 22b on the main hot water supply A side or the drop-off opening / closing valve 25a for automatic hot water supply, for example, and the water flow switch 21b of the main hot water supply A turns on the main hot water supply. When the flow of water equal to or greater than the minimum operating water amount of the water heater A is detected, the minimum operating water amount detection signal (MOQ signal) on the main water heater A side is turned on (step S3 in FIG. 2). This MOQ signal is a signal that is sent out when the minimum operating water amount required to operate the main water heater A is detected. In the present embodiment, as described later, the main water heater A
The operation of the on-off valve 62 and the mixing control valve 61 is controlled using the MOQ signal of the above. Note that this MOQ
The signal generating circuit is a known circuit that is generally provided in a general hot water supply device.

(4) Then, the MOQ signal of the main water heater A is
Similarly to the ON information of the hot water supply operation switch, the main controller 30 of the main water heater A communicates with the solar hot water connection controller 60 of the solar hot water connection unit C.
When this MOQ signal is turned on, the solar hot water connection unit C opens the on-off valve 62 based on a command from the solar hot water connection controller 60 and starts to receive solar hot water from the solar hot water heater B, The control for the control valve 61 is started (step S4 in FIG. 2).

The mixing control valve 61 is controlled by the hot water supply set temperature information received by the solar hot water connection controller 60, the solar hot water temperature information from the solar hot water temperature sensor 63, and the water supply temperature information from the hot water temperature sensor 64. It is performed based on. That is, the solar hot water supply connection controller 60, based on these information,
The mixing ratio of the mixing control valve 61 is calculated in order to set the temperature of the solar hot water to be sent to the main water heater A to the hot water supply set temperature, and the calculated mixing ratio is used as an operation command as the mixing control valve 61.
To communicate.

The solar hot water connection controller 60
If the temperature of the hot water supply can be adjusted to the hot water supply set temperature using the solar hot water in the calculation of the mixing ratio, that is, if the solar hot water temperature is higher than the hot water set temperature, the main controller 30 A signal indicating that the operation is unnecessary (combustion operation unnecessary command signal) is returned. When the main controller 30 receives this combustion operation unnecessary command signal,
The main water heater A does not perform the combustion operation, and starts hot water supply only with the hot water supplied from the solar hot water supply connection unit C. That is, in the present embodiment, when there is no return of the combustion operation unnecessary signal from the solar hot water supply connection controller 60, or when the solar hot water temperature is lower than the hot water supply set temperature, a signal requesting the combustion operation from the solar hot water connection controller 60 is issued. The main controller 3 only when
Since 0 causes the burner 11 of the heat exchange can 10 of the main water heater A to perform the combustion operation, the main water heater A can perform the efficient combustion operation without waste.

Even when the main water heater A does not initially perform the combustion operation, if the hot water set temperature is changed during the operation of the present apparatus, the changed hot water set temperature information is sent from the main controller 30. Since the information is communicated to the solar hot water connection controller 60 and the information is shared between the main controller 30 and the solar hot water connection controller 60, the solar hot water connection controller 60 controls the mixing control valve 61 based on the new hot water supply set temperature. Control is performed, and if necessary, the main water heater A also starts the combustion operation.

(5) If the MOQ signal of the main water heater A is not turned on while the hot water supply operation switch is turned on, the on-off valve 62 of the solar hot water supply connection unit C is fully closed and the mixing adjustment is performed. The valve 61 continues the standby state when the water side is fully opened (step S5 in FIG. 2).

When a non-heated water supply request (water request signal), that is, water is requested by the remote controller 50, the main controller 30 communicates the water request signal to the solar hot water supply connection controller 60. The solar hot water supply connection controller 60 that has received the water request signal controls the operation of the mixing control valve 61 so as to be in the water side fully open state. Therefore, even when the solar water heater B is connected to the main water heater A, it is possible to appropriately supply water according to a request of the device user.

B: For hot water supply stop determination method on auxiliary water heater side
Operation at the time of hot water supply stop determination: Next, the method of determining hot water supply stop on the auxiliary water heater side and the control operation at the time of hot water supply stop determination in the hot water supply device with solar hot water supply function according to the present invention will be described.

That is, as described above, when the hot water supply from the solar water heater B is stopped due to the freezing of the piping of the solar water heater B or the failure of the on-off valve 62, the water from the water source is supplied from the mixing control valve 61. Is intermittently flooded. Therefore, in the hot water supply device with a solar hot water supply function according to the present invention, the intermittent outflow is detected by the solar hot water supply connection controller 60, and the stop of the hot water supply on the solar hot water supply side is determined in the following procedure.

(1) When the hot water supply operation switch of the remote control 50 is turned on while the hot water supply from the solar water heater is stopped (step S1 in FIG. 3), first, the MOQ signal in the main water heater A is turned on. Is determined (step S2 in FIG. 3). That is, by determining whether the MOQ signal is on or off, it is determined whether or not the main hot water supply A has detected the flow of water equal to or greater than the minimum operating water amount. If there is water flow, the process proceeds to the next step S3. If there is no water flow, the process returns to step S2.

(2) When the MOQ signal is on, M
It is determined whether or not the ON / OFF of the OQ signal has been performed within a predetermined time. More specifically, first, in step S3 of FIG. 3, it is determined whether three seconds or more have elapsed since the last time the MOQ signal was turned on, and in the subsequent step S4 of FIG. It is determined whether or not the time is within 25 seconds from the time when. This is because when the supply of hot water from the solar water heater is stopped, M
Since the OQ signal repeats on / off at a constant cycle, the time interval from the previous MOQ signal on to the current MOQ signal on is detected, and the cycle of the MOQ signal on / off is accompanied by the stoppage of the hot water supply. Is determined. Here, the detection of the MOQ signal ON / OFF cycle is set to 3 seconds or more and 25 seconds or less because the hot water supply apparatus used when the applicant experimented on the present invention is as follows.
This is because it has been found that the ON / OFF of the MOQ signal is repeated in this range in the case of stopping the supply of hot water on the solar side, and this numerical value can be appropriately set for each hot water supply device actually used.

(3) If it is determined in steps S3 and S4 in FIG. 3 that the ON / OFF of the MOQ signal has been performed within the above-described predetermined time, then in step S5 in FIG. The solar hot water supply connection controller 6 has an ON / OFF cycle as the minimum operating water amount detection signal data (hereinafter, referred to as MOQ signal data) ta (second).
0 is stored in a RAM (not shown).

(4) Next, in step S6 in FIG. 3, the stored MOQ signal data ta and the previously detected R
The signal is compared with the MOQ signal data tb stored in the AM,
It is determined whether the deviation is equal to or less than a predetermined value (1 second in the illustrated example). Here, the difference between the two data ta and tb is determined to determine whether or not the cycle of ta and the cycle of tb are the same cycle. In the illustrated example, the predetermined value is set to 1 second. This is because if the error is within this range, even if it is determined that the cycle is the same, there is little error in determining whether to stop the hot water supply on the solar water heater side. Therefore, this numerical value can be appropriately changed within a range that does not cause an error in the determination of the stop of the hot water supply on the solar water heater side.

(5) If it is determined that the deviation is within one second, the error counter is counted in the subsequent step S7 in FIG.

(6) When the count of the error counter reaches a predetermined number (10 times in the illustrated example) (step S8 in FIG. 3), it is determined in the following step S9 in FIG. 3 that the hot water supply on the solar water heater side is stopped. With, for example,
An alarm display request signal is transmitted to an alarm unit (not shown) of the main water heater A, an alarm unit of the remote controller 50, and the like. That is, the reason why the error counter reaches the predetermined number is as shown in FIG.
This is because the ON / OFF of the MOQ signal indicating the stop of the hot water supply on the solar water heater side detected in steps S2 to S6 is continuously detected for a certain period. In such a case, the piping on the solar water heater side is used. This is because it is determined that freezing or the failure of the on-off valve 62 has occurred.

The steps S3, S4, S6 in FIG.
If a negative determination is made in step (1), it is determined that the ON / OFF cycle of the MOQ signal is not constant, so the count of the error counter is canceled (reset) in step S10 in FIG. If the MOQ signal is turned off in this state, the process returns to step S2 in FIG.
It waits until the signal is turned on (that is, until intermittent water discharge occurs again) (step S11 in FIG. 3). The same applies to the case where the error counter does not count the predetermined number of times in step S8 in FIG.

As described above, in this embodiment, by monitoring the ON / OFF cycle of the MOQ signal of the main water heater A, the amount of water discharged from the mixing control valve 61 is monitored, and the fluctuation is determined by a predetermined value. When repeated in a cycle, the stop of the hot water supply on the solar water heater side is determined. Therefore, when monitoring the water flow rate of the mixing control valve 61, it is possible to determine the stop of the hot water supply without requiring a water flow sensor for detecting the water flow rate on the water discharge side of the mixing control valve 61.
In detecting the OFF cycle, the predetermined time is 3 seconds or more and 25 times or more.
Since the time is set to be short within seconds (FIG. 3, step S3,
Even when a hot water tap such as a curan is opened and closed, it is possible to reliably determine the stop of hot water supply on the solar water heater side without erroneous detection.

Although not shown, when the supply of hot water from the solar water heater is determined to be stopped, the mixing control valve 61 is controlled so that the water side is opened and fixed, as described later. A constant amount of water can be stably supplied to the main water heater by eliminating intermittent water discharge on the side. Thus, the main water heater performs the combustion operation, so that the hot water set by the remote controller 50 can be supplied in a stable state.

Embodiment 2 In the second embodiment of the present invention, when determining whether to stop the hot water supply on the solar water heater side in the water heater with the solar water heater function of the first embodiment, the water inlet water temperature of the mixing control valve 61 is determined. This is a result of adding the temperature difference of the water outlet temperature to the determination element. Specifically, the determination of the stop of the hot water supply on the solar water heater side is performed according to the flowchart shown in FIG.

(1) First, when the hot water supply operation switch of the remote controller 50 is turned on while the hot water supply from the solar water heater is stopped (step S1 in FIG. 4),
It is determined whether or not the MOQ signal in main water heater A is on (step S2 in FIG. 4). If the MOQ signal is on, whether or not the on / off of the MOQ signal has been performed within a predetermined time period Is determined (step S3 in FIG. 4).
S4) The same as in the first embodiment.

(2) If it is determined in steps S3 and S4 in FIG. 4 that the ON / OFF cycle of the MOQ signal is within a predetermined time, the flow proceeds to step S5 in FIG. The inlet water temperature and the outlet water temperature are compared, and it is determined whether or not the temperature difference between the two is within a predetermined value (3 ° C. in the illustrated example). This is because, as described above, in the state where the hot water supply from the auxiliary water heater is stopped, almost no temperature change occurs between the water inlet temperature of the mixing control valve 61 and the outlet water temperature of the outlet side. This is because if there is no large difference between the two temperatures, it can be determined that there is no hot water supply from the solar water heater. The reason why the predetermined value is set to 3 ° C. is that the mixing control valve 61
If the hot water is supplied from the solar water heater side, the water supplied from the water supply passage 80 is considered to cause a certain temperature change (temperature rise) when passing through the mixing control valve 61. In this case, it is not to determine that the hot water supply from the solar water heater is stopped, and the specific numerical value here can be appropriately changed according to the hot water supply temperature of the auxiliary water heater B or the like. The water inlet temperature and the water outlet temperature of the mixing control valve 61 are detected by the feed water temperature sensor 64 and the hot water temperature sensor 65, respectively.

(3) If the deviation between the water-side water inlet temperature and the water-side water outlet temperature is within 3 ° C., in the subsequent step S6 in FIG. 4, the ON / OFF cycle of the MOQ signal detected this time is changed. The MOQ signal data ta (second) is stored in the RAM in the solar hot water supply connection controller 60.

(4) Thereafter, the stop of the hot water supply from the solar water heater is determined by the same method as in the first embodiment, and an alarm display request signal is sent to an external alarm means. (See steps S7 to S10 in FIG. 4). Further, as in the first embodiment, the error counter is reset in a predetermined case (step S11 in FIG. 4), and returns to the initial state when the MOQ signal is turned off (step S12 in FIG. 4).

As described above, in the hot water supply apparatus with the solar hot water supply function shown in the second embodiment, when the stop of the hot water supply from the solar water heater side is determined, the water supply of the mixing control valve 61 is determined in addition to the determination method of the first embodiment. By considering the temperature difference between the side inlet water temperature and the outlet water outlet temperature, it is possible to expect an improvement in the accuracy of the determination of stopping the hot water supply from the solar water heater than in the first embodiment.

Embodiment 3 In the third embodiment according to the present invention, when determining whether to stop the hot water supply on the solar water heater side in the hot water supply apparatus with solar hot water supply function of the first embodiment, first the hot water supply is performed according to a normal procedure. When it is determined that the supply is stopped, only the control for stabilizing the intermittent water supply of the mixing control valve 61 is performed once, and then, when the stop of the hot water supply from the solar water heater is determined to be further continued, the first time. Then, it is determined that the final supply of hot water from the solar water heater is to be stopped and an alarm display request signal is transmitted.

(1) That is, the operation of the hot water supply apparatus with solar hot water supply function according to the third embodiment will be described with reference to the flowchart of FIG. 5. First, the hot water supply from the solar hot water supply side is stopped. In this state, when the hot water supply operation switch of the remote controller 50 is turned on (step S5 in FIG. 5).
1) It is determined whether or not the MOQ signal in the main water heater A is on (step S2 in FIG. 5). If the MOQ signal is on, the on / off of the MOQ signal is continued in steps S3 and S4 in FIG. Is determined within a predetermined time. If an affirmative determination is made in steps S3 and S4 in FIG. 5, the ON / OFF cycle of the MOQ signal detected this time is stored as MOQ signal data ta (second) in the RAM in the solar water hot water supply connection controller 60. At the same time (step S5 in FIG. 5), it is compared with the previously detected MOQ signal data tb, and when the deviation is equal to or smaller than a predetermined value (step S6 in FIG. 5), the first error counter is counted (FIG. 5). 5 step S7), it is determined whether the value reaches a predetermined number of times (three times in the illustrated example) (step S8 in FIG. 5), as in the first embodiment.

However, this embodiment is different from the first embodiment in that the error counter is composed of a first error counter and a second error counter, and the count of the first error counter is different from that of the first embodiment. The number is set to three, which is smaller than that in the first embodiment. this is,
In the present embodiment, as will be described later, the final determination of the stoppage of the hot water supply from the solar water heater is left to the counting result of the second error counter.
Since the counting by the error counter is performed exclusively for controlling the mixing control valve 61, the number of times of counting is reduced, and the mixing control valve 61 is controlled as early as possible to stabilize the hot water supply operation.

(2) That is, in the present embodiment, when the count of the first error counter reaches a predetermined value, the mixing control valve 61 is fixed with the water side open as shown in step S9 in FIG. At the same time, the second error counter is counted. The reason why the mixing control valve 61 is fixed on the water side is as follows.
When the first error counter reaches the predetermined value in step S8 in FIG. 5 described above, it is temporarily determined that the hot water supply from the solar water heater is stopped, and the water side of the mixing control valve 61 is opened and fixed. This is for stabilizing the amount of water discharged from the mixing control valve 61 to a constant state.

(3) Then, in step S10 of FIG. 5, it is determined whether or not the count of the second error counter has reached a predetermined number (10 in the illustrated example), and it is determined that the count has reached the predetermined number. Only when this occurs, it is finally determined that the hot water supply from the solar water heater has been stopped, and an alarm display request signal is sent to an external alarm means (step S1 in FIG. 5).
1).

(4) Steps S3 and S3 in FIG.
If a negative judgment is made in 4, S6, the first
And the second error counter is reset (step S12 in FIG. 5). When the result in steps S8 and S10 in FIG. 5 is negative and the MOQ signal is off (step S13 in FIG. 5), the water side of the mixing control valve 61 fixed by opening the water side in step S9 in FIG. The open fixing is canceled, and the mixing control valve 61 is returned to the normal state (step S14 in FIG. 5), and the normal hot water supply operation is enabled.

As described above, the stoppage of the hot water supply from the solar water heater is determined in two stages because the stoppage of the hot water supply from the solar water heater side is caused by, for example, freezing of the piping, and the nighttime temperature decreases. When hot water is supplied, the hot water supply is stopped.However, as the temperature rises during the day, the frozen water in the piping may be thawed and the hot water supply from the solar water heater may be restarted. When the pipe is frozen at night, the mixing control valve 61 is fixed to the water side in step S9 in FIG. 5 to supply water from the water source to the main water heater A, and the water in the pipe is drained. 5, a negative determination is made in step S10 of FIG. 5 to cancel the water-side fixing of the mixing control valve 61, thereby enabling normal use. Moreover, in the present embodiment, the stop of the hot water supply is determined in two stages as described above. Therefore, even when the pipe is not frozen, the stop of the hot water supply can be determined more accurately than in the case of the first embodiment without erroneous determination.

Embodiment 4 In the fourth embodiment of the present invention, hot water from the solar hot water supply connection unit C is supplied between the solar hot water supply connection unit C and the main hot water supply unit A of the hot water supply device with a solar hot water supply function. This figure shows a method for determining the stop of hot water supply from the solar water heater when a pressurizing unit D is provided to supply the hot water to the main water heater A. Particularly, in the fourth embodiment, the hot water supply from the solar water heater is shown. At the time of the stop determination, the water supply temperature of the water inlet channel 80 is detected, and the possibility of pipe freezing is determined from the water supply temperature, and different determination methods are used.

That is, in the fourth embodiment, as shown in FIG. 6, a pressurizing pump 110, a check valve 111, an accumulator 112, a pressure switch A pressurizing unit D having a 113 and a flow switch 114 is interposed, and the water from the solar hot water supply connection unit C is pressurized by the pressurizing means such as the pump 110 and the accumulator 112 and supplied to the main water heater A. Have been. Therefore, in the fourth embodiment, the first embodiment
Even when the ON / OFF cycle of the MOQ signal is detected as in the cases of (3) to (3), the ON / OFF timing of the MOQ signal itself does not coincide with the intermittent water discharge timing from the mixing control valve 61. ON / OFF cycle comparison (t
a) and tb), it is not possible to accurately detect the stoppage of hot water supply from the solar water heater.

Therefore, in the fourth embodiment, when determining whether or not the ON / OFF cycle of the detected MOQ signal is the same as the ON / OFF cycle of the previous MOQ signal, a predetermined past For a plurality of times (for example, FIG. 8
In step S4, the last five MOQ signal data ta
Is added to the minimum working water amount detection signal addition data (hereinafter, M
OQ signal addition data) is stored as Da, and this is compared with reference data Ds (for example, 60 seconds in step S5 in FIG. 8) set in advance according to the number of additions, so that the pressurizing means is interposed. To absorb the timing shift of the MOQ signal due to the above. That is, in the fourth embodiment, when detecting the ON / OFF cycle of the MOQ signal, the shift of the ON / OFF cycle caused by the presence of the pressurizing unit is considered in advance, and the MOQ signal data ta to be detected is divided into a plurality of times. The addition is intended to reduce the influence of the deviation. The reference data Ds set here measures the ON / OFF cycle of the MOQ signal generated when the hot water supply from the solar water heater is stopped, and includes an allowable error in the cycle. Is multiplied according to the number of additions.

The method for determining the stop of hot water supply on the solar water heater side in the hot water supply device with solar water heater function according to the fourth embodiment and the operation for determining the stop of hot water supply will be described below with reference to FIG.
A description will be given based on the flowchart shown in FIG.

(1) First, when the hot water supply operation switch of the remote controller 50 is turned on while the hot water supply from the solar water heater is stopped (step S1 in FIG. 7), the MOQ signal in the main water heater A Is turned on (step S2 in FIG. 7).

(2) Next, in step S3 in FIG. 7, it is determined whether or not a jumper is set so that the mixing control valve 61 is fixed to the water side. This takes into account a hot water supply device that has a jumper setting to set the mixing control valve 61 to be fixed to the water side in advance when there is a high possibility of pipe freezing in winter, etc. The mode is switched to the water-side fixed mode in step S5, and the following operations are not performed. On the other hand, when the setting of the jumper is not fixed on the water side, or when there is no such setting of the jumper, the process proceeds to the subsequent step S4 in FIG.

(3) FIG. 7 In step S4, it is determined whether or not the feed water temperature detected by the feed water temperature sensor 64 has reached a predetermined temperature (7 ° C. in the illustrated example). In the illustrated example, it is determined whether the temperature is equal to or lower than 7 ° C., and if the determination is negative, the process proceeds to the flowchart of FIG. 8, and if the determination is affirmative, the process proceeds to the flowchart of FIG. Here, the reason why the predetermined temperature is set to 7 ° C. is that the applicant has determined that if the temperature of the water flowing through the water supply channel 80 is 7 ° C. or less, the pipe may be frozen. Therefore, the predetermined temperature can be freely set and changed within a range in which there is a possibility that the pipe may be frozen.

(4) Next, when the temperature is equal to or higher than 7 ° C. in step S7 in FIG. 7, that is, when the determination in step S7 is negative,
In subsequent steps S1 and S2 in FIG.
It is determined whether the ON / OFF of the Q signal has been performed within a predetermined time. If the determination is affirmative, the ON / OFF cycle of the currently detected MOQ signal is stored as MOQ signal data ta (step in FIG. 8). S3).

(5) In the subsequent step S4 in FIG. 8, the past five times including the MOQ signal data ta detected this time are
The MOQ signal data of the number of times is added and stored as MOQ signal addition data Da.

(6) Thereafter, in step S5 in FIG.
The MOQ signal addition data Da is compared with the reference data Ds (60 seconds in the illustrated example), and when it is determined that the data is equal to or smaller than the reference data Ds, the mixing control valve 61 is fixed at the water side fully open in the subsequent step S6 in FIG. At the same time, an operation command to close the on-off valve 62 is issued, and the second error counter is counted. Here, the mixing control valve 61 is fixed to be fully open on the water side and the second error counter is counted as in the case of the third embodiment. In the fourth embodiment, the stop of the hot water supply from the solar water heater is determined based on the MOQ signal addition data added in step S5 in FIG.
No error counter is provided. Here, the reference data Ds is set to 60 seconds, but it is a matter of course that this numerical value can be appropriately changed according to the number of times of addition of the MOQ signal data.

(7) When the second error counter has counted a predetermined number of times (10 times in the illustrated example), it is finally determined that the on-off valve 62 has failed, and an alarm display request signal indicating the failure is issued. It is sent (step S8 in FIG. 8). The reason why the failure of the on-off valve 62 is determined here is that it is determined in step S4 in FIG. 7 that there is no possibility of freezing of the pipe. On the other hand, if the second error counter does not reach the predetermined number, the process proceeds to step S9 in FIG.
It is determined whether the time from when the signal is once turned off to when it is turned on again is within 3 minutes (from step S9 to step S9 in FIG. 8).
11) If it is determined that the MOQ signal has been turned off for 3 minutes or more, the mixing control valve 61 and the on-off valve 62 are returned to the normal state, and the process returns to step S2 in FIG. The reason for determining whether or not the MOQ signal has been off for 3 minutes or more is that if the state where the MOQ signal is off continues for a long time, it is not necessary to consider the shift caused by the pressurizing means. is there. Therefore, this numerical value can be appropriately changed.

(8) If a negative determination is made in step S1 in FIG. 8, the storage as MOQ signal data is not performed (step S12 in FIG. 8), and a negative determination is made in step S5 in FIG. MO
When the Q signal is turned off, the process returns to step S2 in FIG. 7 (step S13 in FIG. 8). Also, if a negative determination is made in step S2 in FIG. 8, it is determined in step S14 in FIG. 8 whether or not the previous MOQ signal is turned on for 30 seconds or more. Since it is determined that the OFF cycle is not within the predetermined time, the second error counter is reset (step S15 in FIG. 8), and the current MOQ
The signal data is stored as 60 seconds (FIG. 8, step S
16), and proceed to step S4 in FIG. Therefore, in this case, the determination in the following steps S4 and S5 in FIG.
Seconds, the process proceeds to step S13, and M
When the OQ signal is turned off, the process returns to step S2 in FIG.

(9) On the other hand, if it is determined in step S4 in FIG. 7 that the water supply temperature of the water supply channel 80 is 7 ° C. or less,
It proceeds to the flowchart of FIG. The procedure shown in FIG. 9 is basically the same as the procedure shown in the flowchart in FIG. 8 described above. However, the reason why the hot water supply from the solar water heater is stopped when the supply water temperature is 7 ° C. or less is the on-off valve. Since the possibility of freezing of the pipe is higher than that of the failure of the on-off valve 62 (that is, the on-off valve 62 is not often out of order), the failure determination of the on-off valve 62 as shown in FIG. No request signal is sent. Therefore, the following description focuses on differences from the flowchart of FIG.

First, when it is determined that the water supply temperature of the water supply passage 80 is not higher than 7 ° C., the second error counter is reset in step S1 in FIG. This is to return the count of the second error counter to the initial state since the failure determination of the on-off valve 62 is not performed when the supply water temperature is 7 ° C. or lower.

Then, from step S2 to step S2 in FIG.
4 up to the step S4 in FIG.
At 5, the past MOQ signal data including the present time is added (the added MOQ signal data here is Db).
Here, the MOQ signal data t in step S5 in FIG.
The reason why the number of times a is added to the past two times is that the possibility of pipe freezing is high when the feedwater temperature is 7 ° C or less.
This is because by reducing the number of additions, it is possible to detect the stoppage of the hot water supply earlier than usual. Therefore, in the subsequent step S6 in FIG. 9, the MOQ signal addition data Db
The reference data Ds to be compared with the case of FIG.
Set as short as seconds.

If it is determined by the comparison with the reference data Ds in step S6 in FIG. 9 that the supply of hot water from the solar water heater is stopped, the mixing control valve 61 is fixed at the water side fully open in step S7 in FIG. At the same time, a control operation of closing the on-off valve 62 is performed. Here, since the failure determination of the on-off valve 62 is not performed as described above, the count of the second error counter is not performed in step S7 in FIG. Therefore, if the stop of hot water supply from the solar water heater is detected when the feed water temperature is 7 ° C. or less,
Only the operation of stabilizing the water discharge amount on the water discharge side of the mixing control valve 61 is performed, and stable water supply becomes possible by the main water heater A performing the combustion operation.

Other operations in steps S8 to S13 in FIG. 9 are the same as those in FIG.

As described above, according to the present embodiment, the case where the possibility of freezing of the pipe is high and the case where the possibility of freezing of the pipe are low are determined by different settings, so that an appropriate auxiliary water heater side suitable for the environment in which the water heater is used. Of hot water supply can be judged and MOQ
Since the determination of the hot water supply stop on the auxiliary water heater side is performed by adding the signal data, the hot water supply stop determination can be accurately performed even if a pressurizing unit or the like is interposed.

The above-described embodiment merely shows a preferred embodiment of the present invention, and the present invention is not limited to this, and various design changes can be made within the scope.

For example, in the second embodiment, the temperature difference between the water inlet temperature and the water outlet temperature is added as a judgment element to the judgment method of the first embodiment. The present invention can be appropriately combined, for example, the control operation at the time of hot water supply stop determination of the auxiliary water heater shown in the third embodiment can be applied to other embodiments. .

In the above embodiment, a solar water heater is used as the auxiliary water heater. However, other types of water heaters can be used as the auxiliary water heater, and the main hot water heater can be used as an alarm means. Although the remote controller 50 of the water heater A is used, it is also possible to use alarm means such as a home controller in home automation which is separate from the water heater.

Further, the heat exchange can 10 of the main water heater A has
It is not always necessary to connect a bath heating facility such as the bath reheating circuit 40. On the other hand, the main water heater A may be provided with another heating circuit or other circuits.

Further, in this embodiment, the heat exchange can 10 is of an instant heating type, but may be a so-called semi-hot water storage type heat exchange can. In this case, hot water supply circuit 2
Instead of the heat exchange coil 23 of 0, a relatively small hot water tank, that is, a semi-hot water tank is arranged, and the water in the hot water tank is heated and used for hot water supply. The heat exchange coil 43 and the like of the other bath reheating circuit 40 are heat-exchanged and heated by the hot water in the semi-hot water storage tank.

The burner 11 may be an oil burner or a gas burner. The type of burner does not matter.

[0094]

As described above in detail, according to the auxiliary hot water supply side hot water supply stop judging method of the hot water supply device with the auxiliary hot water supply device according to the present invention, the hot water supply to the mixing control valve due to the freezing of the pipe or the failure of the open / close valve. The outage can be determined accurately and quickly.

According to the auxiliary hot water supply side hot water supply stop judging method according to the sixth aspect, in winter when pipe freezing is anticipated, a different auxiliary hot water supply side hot water supply stop judging method can be employed. In addition, an appropriate determination method can be adopted by predicting the cause of stopping hot water supply from the auxiliary water heater.

Furthermore, according to the water heater with the auxiliary water heater according to the seventh aspect, it is possible to stabilize the intermittent water discharge caused by the stop of the hot water supply from the auxiliary water heater, and to provide the season valve which has been required so far. In addition, according to the invention as set forth in claim 8, when the stop of hot water supply from the auxiliary water heater is determined, an alarm display request signal is sent to an external alarm means. The stoppage of hot water supply from the auxiliary water heater can be immediately recognized, and the failure can be quickly detected and resolved.

Further, according to the hot water supply apparatus with the auxiliary water heater according to the eighth aspect, the determination of the stop of the hot water supply from the auxiliary water heater is performed in two stages, so that the more accurate determination of the stop of the hot water supply can be performed. When the hot water supply stop determination is made, the mixing control valve is fixed to the water side, so that stable hot water supply can be performed.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of a hot water supply apparatus with a solar hot water supply function to which an auxiliary hot water supply side hot water supply stop determination method according to an embodiment of the present invention is applied.

FIG. 2 is a flowchart illustrating a basic hot water supply operation of the hot water supply apparatus with a solar hot water supply function.

FIG. 3 is a flowchart illustrating a first embodiment of an auxiliary hot water supply side hot water supply stop determination method in the hot water supply device with a solar hot water supply function.

FIG. 4 is a flowchart illustrating a second embodiment of an auxiliary hot water supply side hot water supply stop determination method in the hot water supply device with a solar hot water supply function.

FIG. 5 is a flowchart illustrating a third embodiment of an auxiliary hot water supply side hot water supply stop determination method in the hot water supply device with a solar hot water supply function.

6 is a configuration diagram showing a schematic configuration of a pressurizing unit installed in the hot water supply device with a solar hot water supply function in FIG. 1;

FIG. 7 is a part of a flowchart for explaining a fourth embodiment of the present invention for explaining an auxiliary hot water supply side hot water supply stop judging method in a hot water supply device having a solar hot water supply function provided with the pressurizing unit.

8 is a flowchart showing another part of the flowchart of FIG. 7;

FIG. 9 is a flowchart showing another part of the flowchart of FIG. 7;

[Explanation of symbols]

Reference Signs List A main water heater B solar water heater (auxiliary water heater) C solar water heater connection unit (auxiliary water heater connection unit) 10 heat exchange can body 20 water heater circuit 21 water inlet channel 22 water outlet channel 30 main controller 40 hot water recirculation circuit 50 remote controller Reference Signs List 60 Hot water supply connection controller 61 Mixing control valve 62 Open / close valve 63, 65 Solar hot water temperature sensor 64 Water supply temperature sensor 70 Solar hot water supply path (auxiliary hot water supply path) 80 Water supply path ta, tb Minimum operating water amount detection signal data Da, Db Minimum operating water amount Detection signal addition data Ds reference data

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Yoshihiko Tanaka 93rd Edocho, Chuo-ku, Kobe-shi, Hyogo Inside Noritz Co., Ltd.

Claims (9)

[Claims] 1. A main water heater, an auxiliary water heater for supplying hot water to the main water heater, and hot water supplied from the auxiliary water heater interposed between the main water heater and the auxiliary water heater. An auxiliary water heater connection unit that mixes with water from a water source and supplies the main water heater with the auxiliary water heater connection unit, wherein the auxiliary water heater connection unit is capable of shutting off hot water supplied from the auxiliary water heater through an auxiliary hot water supply path; A mixing control valve for mixing and controlling the hot water supplied from the auxiliary water heater and the water supplied from the water source via the water supply path to the downstream side of the valve, and sending the mixed water to the water supply path of the main water heater. An auxiliary water heater with an auxiliary water heater connection controller that controls a mixing operation of hot water and water by the mixing control valve, wherein an amount of water discharged from the mixing control valve is monitored, If the fluctuation is repeated, hot water supply from the auxiliary water heater Auxiliary water heater hot-water supply stop determination method auxiliary water heater with a hot water supply apparatus characterized by but is determined to be stopped. 2. The auxiliary water heater according to claim 1, wherein the water output of the mixing control valve is monitored by monitoring an on / off cycle of a minimum operation water amount detection signal of the main water heater. A method for determining the stop of hot water supply on the auxiliary water heater side of the water heater. 3. A step of determining whether or not the on / off cycle is performed within a predetermined time when monitoring the on / off cycle of the minimum operating water amount detection signal, and the cycle is within the predetermined time. Storing the cycle information as the minimum operating water amount detection signal data, and comparing the stored minimum operating water amount detection signal data with the previously detected minimum operating water amount detection signal data, and determining that the difference is equal to or less than a predetermined value. Determining whether the period is equal to or less; counting an error counter when the difference between the cycles is equal to or less than a predetermined value; and supplying hot water from the auxiliary water heater when the error counter reaches a predetermined number. 3. The method for judging stop of hot water supply on the auxiliary water heater side of the water heater with auxiliary water heater according to claim 2, comprising the step of judging that the water heater is stopped. 4. A step of judging whether or not the on / off cycle has been performed within a predetermined time when monitoring the on / off cycle of the minimum operating water amount detection signal, and the cycle is within the predetermined time. Storing the cycle information as the minimum operating water amount detection signal data, and adding the stored minimum operating water amount detection signal data and the past minimum operating water amount detection signal data to obtain the minimum operating water amount detection signal addition data. Calculating, and comparing the calculated minimum working water amount detection signal addition data with predetermined reference data to determine whether the difference is equal to or less than a predetermined value. Counting an error counter when the error counter value is equal to or less than a predetermined value, and stopping the hot water supply from the auxiliary water heater when the error counter reaches a predetermined number. 3. The method for judging stop of hot water supply on the auxiliary water heater side of the hot water supply device with auxiliary water heater according to claim 2, comprising the step of determining that there is a hot water supply. 5. A step of monitoring whether or not the on / off cycle of the minimum operating water amount detection signal is performed within a predetermined time, wherein the cycle is within the predetermined time. Storing the cycle information as minimum operating water amount detection signal data, and comparing the stored minimum operating water amount detection signal data with the previously detected minimum operating water amount detection signal data. Determining whether or not the cycle difference is less than or equal to a predetermined value, and comparing the water-side water inlet temperature and the water-side water outlet temperature of the mixing control valve and comparing the temperature difference within a predetermined value. A step of determining whether or not there is an error counter; a step of counting an error counter when the temperature difference is within a predetermined value; and a step of counting hot water from the auxiliary water heater when the error counter reaches a predetermined number. 3. The method for judging stop of hot water supply on the auxiliary water heater side of the water heater with auxiliary water heater according to claim 2, comprising the step of judging that the supply is stopped. 6. The auxiliary hot water supply side hot water supply stop judging method according to any one of claims 1 to 5, wherein prior to the judgment of the auxiliary hot water supply side hot water supply stop, water mixing of the mixing control valve is performed. A step of determining whether the temperature has reached a predetermined temperature is provided. Depending on a result of the determination, the auxiliary hot water supply side hot water supply stop determination method having different set values in each step of the auxiliary hot water supply side hot water supply stop determination method is provided. And determining whether to stop using the auxiliary water heater of the water heater with the auxiliary water heater. 7. When it is determined that the hot water supply from the auxiliary water heater is stopped by the auxiliary water heater-side hot water supply stop determination method according to any one of claims 1 to 5, A water heater with an auxiliary water heater, comprising a control structure for fixing the mixing control valve by opening the water side. 8. When the auxiliary hot water supply side hot water supply stop judging method according to any one of claims 1 to 5 determines that hot water supply from the auxiliary hot water heater is stopped, the mixing control valve is set to water. A hot water supply device with an auxiliary water heater, characterized by having a control structure for opening and fixing the side and transmitting an alarm display request signal to an external alarm means. 9. A case where it is determined that the hot water supply from the auxiliary water heater is once stopped by the auxiliary hot water supply side hot water supply stop determination method according to any one of claims 1 to 5. The water side of the mixing control valve is opened and fixed.
When the second error counter reaches a predetermined number of times, it is finally determined that the supply of hot water from the auxiliary water heater is stopped, and an alarm display request signal is sent to external alarm means. A control mechanism for releasing the fixed state in which the water side of the mixing control valve is opened when the minimum operating water amount detection signal is turned off in a state where the second error counter has not reached the predetermined number of times. A hot water supply device with an auxiliary water heater.