JP2005308263A - Unnecessary water draining method for hot water supply/reheating device and its device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To actualize the drain of unnecessary water such as condensed water generated in a heat source part with heat exchange by using an existing pipe. <P>SOLUTION: Unnecessary water generated in the heat source part is stored in a drain tank, water is filled in a pipe line of a reheating circuit laid between the drain tank and a bathtub 8, and the unnecessary water in the drain tank is drained to the bathtub by using the pipe line as a siphon tube. Namely, this unnecessary water draining method is provided for a hot water supply/reheating device 2 which comprises a hot water filling means for filling hot water into the bathtub, a reheating means for heating the bathtub water being circulated through the reheating circuit into a heat exchanger with a pump, the drain tank for storing the unnecessary water generated in the heat source part, the siphon tube formed between the drain tank and the bathtub via the pipe line of the reheating circuit, a selector valve 80 installed in the siphon tube for selecting the drain tank or the bathtub, and a control part for filling the water in the pipe line of the reheating circuit and draining the unnecessary water from the drain tank to the bathtub when the selector valve selects the drain tank. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

The present invention relates to a method and apparatus for discharging unnecessary water in a hot water supply / remembrance device, and a method and apparatus for discharging unnecessary water such as condensed water generated in a heat source section by heat exchange.

  In a condensing (high efficiency) water heater used in a hot water supply / remembrance device, drain water of strong acid is generated during heat exchange. The drain water is drained by providing a dedicated drain pipe or led to the bathtub and drained together with the bathtub water.

The following prior patent documents exist regarding the drainage of this drain water.
Japanese Patent Laid-Open No. 5-52319 Japanese Patent Application Laid-Open No. Hei 6-147629 discloses that the condensed water is introduced into the hot water supply pipe using the Venturi effect, and Patent Document 2 discloses that the condensed water is naturally dropped to the bathtub. Has been.

  By the way, when condensed water is introduced into the hot water supply pipe using the Venturi effect (Patent Document 1), pressure loss of the hot water supply pipe occurs and the amount of hot water supply becomes insufficient. If drain water is naturally dropped to the bathtub (Patent Document 2), piping from the water heater to the bathtub is limited, and therefore, it may not be applicable depending on the actual installation environment.

  Moreover, in the apartment house, there may be a case where a dedicated pipe for draining drain water or the like cannot be provided, and even if the dedicated pipe can be installed, it causes an increase in equipment cost.

Then, an object of this invention is to implement | achieve wastewater drainage by utilizing existing piping.

  In order to achieve the above object, the waste water discharge method of the hot water supply / remedy device according to the present invention stores the waste water generated in the heat source section in a drain tank and is interposed between the drain tank and the bathtub. In this configuration, water is filled in a circuit pipeline, and the waste water in the drainage tank is drained into the bathtub by using the pipeline as a siphon tube.

  In order to achieve the above object, the filling of the pipe with water may be performed by pouring hot water into the bathtub or using additional circulation of bathtub water.

  In order to achieve the above object, the dilution water added to the waste water may be supplied to the drainage tank by pouring water into the bathtub or by additional circulation of bathtub water.

  In order to achieve the above object, the waste water discharge device of the hot water supply / remembrance device includes a pouring means for pouring water into the bathtub, and a reheating means for circulating the bath water to the heat exchanger by a pump through a reheating circuit. A drainage tank for storing unnecessary water generated in the heat source part, a siphon pipe configured by interposing a pipe of the memorial circuit between the drainage tank and the bathtub, and the siphon pipe installed in the siphon pipe A switching valve for switching between the drainage tank and the bathtub, and filling the pipe line of the tracking circuit with water and switching the switching valve to the drainage tank side, so that the waste water of the drainage tank is moved to the bathtub side. It is the structure provided with the control part which drains.

In order to achieve the above object, the switching valve may be configured to switch to the drain tank side during pouring of water into the bathtub or filling water by additional circulation of bathtub water.

  With the above configuration, according to the present invention, the following effects can be obtained.

  (1) Existing remedy piping can be used for wastewater drainage, so there is no need to install dedicated drainage piping.

  (2) Contributes to power saving because the height difference of apartment houses can be used and wastewater is not drained with a pump.

(3) Since unnecessary water can be diluted with water, a neutralizing agent or the like is not required, and installation of acid-resistant piping is not required, so that installation cost can be reduced.

  An embodiment of the present invention will be described with reference to FIG. FIG. 1 is a diagram showing an outline of a hot water supply / remedy device according to an embodiment of the method for discharging unused water of the hot water supply / remedy device and the apparatus.

  This hot-water supply / remembrance device 2 includes a hot-water supply heat source unit 4 for hot-water supply and a post-replacement heat source unit 6 for reheating, which are operated either in parallel operation or in a single operation. While being possible, as a function of utilizing one function by the other, the hot water heated by the hot water supply heat source section 4 is supplied to the remedy heat source section 6 side so that the hot water can be filled in the bathtub 8. The hot water supply heat source section 4 is highly efficient, and the combustion chamber 10 collects latent heat from the exhaust gas that has passed through the primary heat exchanger 12 together with the primary heat exchanger 12 that uses sensible heat from the combustion heat as a heat source. A secondary heat exchanger 14 is installed. The secondary heat exchanger 14 is provided with a drain receiver 18 that receives the drain water 16, although drain water 16 that is unnecessary water is generated due to condensation of water vapor in the exhaust gas when the latent heat is recovered.

  Water W is supplied to the hot water supply circuit 20 from a water pipe or the like connected to the water supply port 22, and the water W is guided to the secondary heat exchanger 14 side and heated by the secondary heat exchanger 14. Heated by the primary heat exchanger 12 and reaches the hot water supply port 24. A hot water tap 26 and a shower are installed at the hot water outlet 24.

  In addition, a flow rate sensor 28 for detecting the passage flow rate, a temperature sensor 30 for detecting the incoming water temperature, a bypass circuit 32, a bypass water control valve 34, a water control valve 36, and a mixed hot water temperature are provided in the pipes constituting the hot water supply circuit 20. A temperature sensor 38 to detect, a pressure relief valve 40 and the like are installed. The bypass circuit 32 and the bypass water control valve 34 of the primary heat exchanger 12 are means for increasing responsiveness to the set temperature of hot water. Further, in order to reduce the drain water 16 generated in the secondary heat exchanger 14, a bypass valve 44 is installed together with the bypass circuit 42 across the secondary heat exchanger 14.

  Further, a remedy circuit 46 is installed on the bathtub 8 side, the remedy circuit 46 and the hot water supply circuit 20 are connected by a pouring circuit 48, and the pouring circuit 48 is branched before the hot water supply port 24, This is means for pouring hot water HW obtained in the hot water supply circuit 20 into the memorial circuit 46. Such a pouring circuit 48 is provided with a pouring solenoid valve 50, a pouring amount sensor 52 for detecting the pouring amount, a check valve 54 and the like, and the hot water HW obtained on the hot water supply side is on the bathtub 8 side. Be poured into hot water. The check valve 54 constitutes means for cutting off the water supply side and the bath water.

  The drain receiver 18 and the tracking circuit 46 are connected by a drain circuit 56, and the drain water 16 in the drain receiver 18 is guided to the tracking circuit 46 through the drain circuit 56. The drain circuit 56 is provided with a drain tank 58 for storing the drain water 16 and a switching valve 60.

  The drain water 16 generated in the secondary heat exchanger 14 is guided and stored in the drain tank 58, and the drain circuit 56 and the memory circuit 46 interposed between the drain tank 58 and the bathtub 8 are used as siphon tubes. Thus, the drain water 16 is guided from the drain tank 58 to the bathtub 8. In this case, the height difference between the drain tank 58 and the bathtub 8 is configured such that, for example, the overflow surface on the bathtub 8 side is below the drain tank 58. The drain tank 58 is supplied as dilution water of the drain water 16. For example, if the switching valve 60 is opened in a state where water pressure is applied to the remedy circuit 46, bath water is supplied from the remedy circuit 46 to the drain tank 58. 62 or hot water is supplied.

  In this embodiment, the drain circuit 56 may be connected to a heating overflow tank 63 or the like installed in a heating circuit (not shown) so that the heating overflow water is guided to the drain tank 58.

  The remedy circuit 46 is formed between the heat exchanger 66 installed in the remedy combustion chamber 64 and the circulation adapter 68 of the bathtub 8. The remedy circuit 46 includes a pump 70. A water flow switch 72, temperature sensors 74 and 76, a water level sensor 78, and a switching valve 80 are installed. By switching the switching valves 60, 80, the drain water 16 in the drain tank 58 can be poured into the bathtub 8 from the outgoing pipe 82 of the tracking circuit 46 by using the siphon phenomenon due to the positional relationship between the drain tank 58 and the bathtub 8.

  A hot water supply burner 84 is installed on the side of the hot water supply combustion chamber 10 and a combustion burner 86 is installed on the side of the combustion chamber 64 for hot water supply. The fuel gas G is supplied through the fuel gas pipe 88 and the original gas solenoid valve. 90 and a gas proportional valve 92, a switching solenoid valve 94, a gas solenoid valve 96, and a switching solenoid valve 98 are installed on the hot water supply burner 84 side, and a gas solenoid valve 100 is installed on the remedy burner 86 side to switch the fuel gas G. And adjustment is possible. Accordingly, the fuel gas G is supplied to the hot water supply burner 84 and the reheating burner 86 through the gas proportional valve 92 and the like, and is combusted as necessary. Further, an air supply fan 102 that guides combustion air is provided on the combustion chamber 10 side, and a memory fan 104 is provided on the combustion chamber 64 side.

  In addition, the hot water supply / memorial device 2 is provided with a control device 106 mounted on an electrical board, and a remote control device 108 is connected to the control device 106 to enable remote operation.

  Next, the water level sensor of the drain tank 58 will be described with reference to FIG. FIG. 2 shows an outline of a drain tank provided with a water level sensor.

  The drain tank 58 is provided with water level sensors 110, 112, 114, and 116 that detect the water level of the drain water 16. Each of the water level sensors 110, 112, 114, and 116 is installed corresponding to the detection levels H, B, W, and L, L is a discharge end detection water level, W is a pre-dilution water injection water level, and B is two. The bypass heat start water level of the secondary heat exchanger 14 and H indicate the forced discharge start water level.

  Next, the control device 106 of the hot water supply / remedy device 2 will be described with reference to FIG. FIG. 3 is a block diagram showing an outline of the control device 106.

  The control device 106 is provided with a control unit 118 constituted by a microcomputer or the like. The control unit 118 receives detection signals from the water level sensors 110 to 116, the water level sensor 78, the running water switch 72, and other sensors 120. Then, the control output of the control unit 118 is applied to the switching valves 60 and 80, the bypass valve 44, the pump 70, other functional parts 122, and the like. A control unit 124 of the remote control device 108 is connected to the control unit 118, and an operation input is applied from the control unit 124, an operation unit 126 including a key switch, and the control output of the control unit 124 is a display unit 128, an alarm. It is the structure added to the machine 130 and the other apparatus which is not shown in figure.

  Regarding the hot water supply / remedy device 2 described above, the drain operation of the drain water 16 will be described together with the basic operation.

  Condensed water generated in the secondary heat exchanger 14 is received as drain water 16 by a drain receiver 18 and led from a drain circuit 56 to a drain tank 58 and stored. By switching the switching valve 60 installed between the drain tank 58 and the remedy circuit 46, the drain circuit 56 and the remedy circuit 46 reaching the bathtub 8 are communicated with each other. The switching valve 80 is used to form or close the memorial circuit 46 that returns from the bathtub 8 via the pump 70 to the bathtub 8 again. The drain water 16 in the drain tank 58 closes the switching valve 80 in a state where the outgoing pipe 82 of the remedy circuit 46 is filled with hot water, and opens the switching valve 60, that is, the drain tank 58 and the remedy through the switching valve 60. The circuit 46 is opened, and the drain water 16 in the drain tank 58 is discharged to the bathtub 8 side by a siphon phenomenon due to the positional relationship between the drain tank 58 and the bathtub 8. When the water level of the drain tank 58 decreases and reaches a predetermined water level L (FIG. 2), the switching valve 60 is closed, the connection between the remedy circuit 46 and the drain circuit 56 is shut off, and the drain water 16 is drained from the drain tank 58. Accumulate on.

  The drain water 16 in the drain tank 58 is diluted with water and discharged, and the dilution is performed by putting water in the drain tank 58 in advance. In order to put the dilution water into the drain tank 58, when there is the bathtub water 62, the pump 70 is driven, the bathtub water 62 is circulated through the memory circuit 46, and then the switching valve 60 is opened. When there is no bathtub water 62, hot water is poured into the bathtub 8, the hot water for pouring is supplied to the remedy circuit 46, and then the switching valve 60 is opened. In any case, the water in the remedy circuit 46 is supplied from the switching valve 60 into the drain tank 58 due to the water pressure in the remedy circuit 46. When the water level in the drain tank 58 reaches the water level W, the switching valve 60 is closed, and the pump 70 is stopped or the pouring is stopped.

  In this way, the drain water 16 is stored in the drain tank 58 containing the dilution water. When the water level in the drain tank 58 reaches the predetermined water level B, it approaches the upper limit water level H, so the bypass valve 44 is opened, the amount of water passing through the secondary heat exchanger 14 is reduced, and the generation of the drain water 16 is suppressed. When the drain water 16 in the drain tank 58 reaches the water level B, the circulation circuit 46 of the remedy circuit 46 is established and the pump 70 is driven. It may be determined that there is no drain water 16 and the drain water 16 may be discharged.

  The drain water 16 is preferably discharged when the bathtub water 62 is discharged from the bathtub 8 in order to prevent mixing into the bathtub water (bath water) 62. Therefore, the discharge of the bath water 62 is detected by monitoring the water level of the bath water 62 with the water level sensor 78. When the water level of the bath water 62 gradually decreases and reaches the circulation adapter 68 or less, the drain water 16 Eject operation. In addition, it is good also as a structure which provides a sensor etc. in the drainage part 69 of the bathtub 8, and detects discharge | emission of the bathtub water 62 by the signal. In addition, when filling the bathtub 8 with a predetermined time or a predetermined amount of pouring, if the water level does not rise, the plug of the drainage part 69 of the bathtub 8 is removed. Judging and draining the drain water 16 may be performed.

  As a result, waste water such as drain water 16 is discharged from the drain tank 58 to the outside of the apparatus, and waste water such as drain water 16 can be discharged without providing a dedicated drain pipe. Moreover, if the discharge is made into the structure discharged | emitted to the bathtub 8 without the bath water 62, the drain water 16 will not be used for bathing, but it is hygienic.

  Next, drainage treatment of the drain water 16 will be described with reference to FIGS. 4 and 5. 4 and 5 are flowcharts showing the waste water treatment. 4 and 5, A indicates a place where the flowcharts are connected.

  It is determined whether or not the drainage timing has arrived (step S1). The drainage timing is when the drainage part 69 of the bathtub 8 is opened, and the drainage timing is set based on the water level detection of the water level sensor 78. When the drainage timing arrives, drainage treatment (step S5 and subsequent steps) is performed regardless of the water level in the drain tank 58. If it is not the drainage timing, it is determined from the detection signal of the water level sensor 112 whether or not the water level in the drain tank 58 has reached the water level B close to the upper limit water level H (step S2). When the water level of the drain water 16 has reached the water level B, the process proceeds to step S3. Otherwise, the process proceeds to step S14.

  When the drain water 16 has reached the water level B, the bypass valve 44 is opened and water is passed through the bypass circuit 42 of the secondary heat exchanger 14 to reduce the water flow rate of the secondary heat exchanger 14 (drain water suppression Process = Step S3). As a result, the generation of drain water 16 from the secondary heat exchanger 14 is suppressed. At that time, the user can be alerted by the presentation of information by the display unit 128 or the alarm device 130.

  It is determined whether or not the water level in the drain tank 58 has reached the upper limit water level H (step S4). If the upper limit water level H has not been reached, the process proceeds to step S14. When the upper limit is reached, the process shifts to forced drainage. At that time, the user can be alerted by the presentation of information by the display unit 128 or the alarm device 130.

  It is determined whether or not the bathtub water 62 remains in the bathtub 8 (step S5). This determination is performed by driving the pump 70 of the remedy circuit 46 and referring to the output of the running water switch 72 and the output of the water level sensor 78. When the bathtub water 62 remains, the process proceeds to step S8.

  Here, an air purge of the outgoing pipe 82 of the tracking circuit 46 is performed by a pouring operation (step S6). That is, the switching valve 80 is closed, water is supplied from the pouring circuit 48 via the forward pipe 82, a path filled with the water supply to the bathtub 8 is established, and air is excluded from the inside of the pipe.

  This pouring continues until the air purge of the outgoing pipe 82 of the tracking circuit 46 is completed (step S7). The end of the air purge is determined by a predetermined amount of pouring or pouring for a predetermined time.

  If the bathtub water 62 remains in the bathtub 8 in step S5, the bathtub water 62 is circulated through the remedy circuit 46 to perform air purge of the remedy circuit 46. That is, the switching valve 80 is opened, the circulation circuit of the bathtub 8 → the switching valve 80 → the pump 70 → the bathtub 8 is established, and the air in the pipeline is removed by water flow (step S8).

  By driving the pump 70, the bathtub water 62 is circulated in the tracking circuit 46 to perform air purge (step S9). This air purge is terminated when, for example, detection of running water by the running water switch 72 continues for a predetermined time.

  The pump 70 is stopped and the switching valve 80 is closed (step S10). As a result, the memorial circuit 46 is filled with the bath water 62.

  The switching valve 60 is opened, and the drain water 16 from the drain tank 58 starts to be discharged (step S11). Since the drain tank 58 is open to the atmosphere and the position of the bathtub 8 is lower than the drain tank 58, the drain water 16 flows out of the drain tank 58 and is discharged to the bathtub 8 side.

  The drain water 16 is continuously discharged until the water level in the drain tank 58 reaches the lower limit level (water level L), and when the water level reaches the lower limit water level L, the drainage is stopped (step S12). In this case, if the drain tank 58 is drained until it is emptied, air may flow into the bathtub 8. Therefore, in particular in the case of forced drainage, the drainage is performed at the lower limit water level L in order to prevent air from entering the memorial circuit 46. Stop.

  The drainage in the drain tank 58 is finished, and the switching valve 60 of the drain circuit 56 is closed (step S13). When drain water suppression is performed in step S3, the bypass valve 44 is closed and the bypass circuit 42 of the secondary heat exchanger 14 is closed.

  Next, it is determined whether there is dilution water in the drain tank 58 (step S14). That is, it is determined whether or not the water level in the drain tank 58 has reached the water level W. Usually, immediately after drain water 16 is discharged, there is no diluted water.

  Determination of the water level of the bathtub 8, that is, whether or not the bathtub water 62 remains is determined (step S15). This determination may be made after the discharge process, by using the determination result of step S5, or by driving the pump 70 of the remedy circuit 46 and the output of the water flow switch 72 and the water level sensor 78 as in step S5. Refer to the output of. When the bathtub water 62 remains, it transfers to step S22.

  Due to the pouring operation, dilution water is supplied from the remedy circuit 46 to the drain tank 58 via the switching valve 60. First, the switching valve 80 is closed, and a route from the pouring circuit 48 to the bathtub 8 via the forward pipe 82 is established (step S16).

  The pouring is started and water pressure is applied to the switching valve 60 (step S17). Since water pressure is applied to the switching valve 60, when the switching valve 60 is switched to the open state, it flows through the memory circuit 46. Hot water flows into the drain tank 58 from the switching valve 60, and this becomes dilution water of the drain water 16 (step S18).

  Water pouring is continued until the water level in the drain tank 58 reaches the injection water level (water level W) of the dilution water (step S19), the switching valve 60 is closed, and water pouring into the drain tank 58 is stopped (step S20). Is stopped, and the waste water treatment is terminated (step S21).

  Further, when the bathtub water 62 remains in the bathtub 8 in step S15, the dilution water is supplied to the drain tank 58 from the tracking circuit 46 via the switching valve 60 by circulating the bathtub water 62 in the tracking circuit 46. Supply as. In this case, the switching valve 80 is opened, and a circulation circuit extending from the bathtub 8 to the switching valve 80 → the pump 70 → the bathtub 8 is established (step S22).

  The pump 70 is driven to circulate the bath water 62 in the remedy circuit 46, and a water pressure is applied to the switching valve 60 (step S23). Since water pressure is applied to the switching valve 60, when the switching valve 60 is opened, the circulating water flowing through the memory circuit 46 flows into the drain tank 58 from the switching valve 60 (step S24). Water injection is continued until the water level in the drain tank 58 reaches the injection water level (water level W) of the dilution water (step S25). Then, the switching valve 60 is closed, water injection into the drain tank 58 is stopped (step S26), the pump 70 is stopped, and the drainage process is ended (step S27).

  Regarding the drainage treatment of the drain water 16 described above, as shown in FIG. 6, even when the intermediate portion of the remedy circuit 46 is bent and arranged higher than the hot water supply / remedy device 2, Since the overflow water level surface 132 is set higher than the overflow water level surface 132, as shown in FIG. 7, if the forward pipe 82 is filled with, for example, the bath water 62 and air purge is performed, the drain water 16 in the drain tank 58 as shown in FIG. And the bathtub water 62 of the bathtub 8 can be connected, and the drain water 16 can be drained from the drain tank 58 to the bathtub 8 side.

  With respect to the hot water supply / memorial device 2 described above, features, modifications, and the like are listed below.

  (1) Condensing (high efficiency) Water can be drained through the remedy circuit 46 and the bathtub 8 without installing a special pipe in the drain pipe of the drain water 16 generated in the water heater. The drain water 16 stored in the drain tank 58 is poured into the bathtub 8 by applying the siphon principle using, for example, the outgoing pipe 82 of the remedy circuit 46 as a siphon pipe. For this reason, even if the pipe line in the middle is bent and piped, it does not become an obstacle to drainage.

  (2) Since dilution water is mixed into the drain water 16 in the drain tank 58, a strong acid can be converted into a weak acid. For this reason, the memory circuit 46 is not deteriorated. In addition, since the dilution water is procured from the memorial circuit 46, no special circuit is required.

  (3) If the drain tank 58 is set higher than the overflow water level surface 132 of the bathtub 8, the siphon principle is not impaired.

  (4) Since drainage of drain water 16 uses the siphon principle rather than natural fall, there are some restrictions on the height relationship between drain tank 58 and bathtub 8, but there is no difference in the height of piping routes such as ceiling piping on the way. As long as the air purge is performed, drainage can be performed efficiently.

As described above, the most preferable embodiment of the present invention has been described. However, the present invention is not limited to the above description, and is described in the claims or disclosed in the specification. It goes without saying that various modifications and changes can be made by those skilled in the art based on the gist, and such modifications and changes are included in the scope of the present invention.

The present invention allows wastewater such as condensed water generated by heat exchange to be efficiently drained from a hot water supply / remedy device, and wastewater such as drain water can be drained by utilizing existing equipment. It is a useful invention.

It is a figure which shows the hot water supply and memorial device which concerns on embodiment of this invention. It is a figure which shows arrangement | positioning of a drain tank and a water level sensor. It is a block diagram which shows the outline | summary of a control apparatus. It is a flowchart which shows the basic operation | movement of a drain discharge process. It is a flowchart which shows a drain discharge process. It is a figure which shows a piping form. It is a figure which shows the air purge process in piping. It is a figure which shows drainage of drain water.

Explanation of symbols

2 Hot water supply / remembrance device 8 Bathtub 12 Primary heat exchanger 14 Secondary heat exchanger 16 Drain water (unused water)
20 Hot water supply circuit 46 Remembrance circuit 48 Pouring circuit 56 Drain circuit 58 Drain tank 60, 80 Switching valve 62 Bath water

Claims (5)

  Waste water generated in the heat source section is stored in a drain tank, water is filled in a pipe of a memorial circuit interposed between the drain tank and the bathtub, and the pipe is used as a siphon pipe in the drain tank. The waste water of the hot water supply / remedy apparatus characterized by draining the waste water of the above to the bathtub.   2. The method of claim 1, wherein filling the pipe with water uses pouring of water into the bathtub or recirculation of bath water.   The method of claim 1, wherein the diluting water added to the waste water is supplied to the drainage tank by pouring water into the bathtub or recirculating the bath water. . Pouring means for pouring into the bathtub,
A memorial means for heating the bath water by circulating it through the memorial circuit to the heat exchanger with a pump;
A drainage tank for storing waste water generated in the heat source,
A siphon pipe constituted by interposing a pipe of the memorial circuit between the drainage tank and the bathtub;
A switching valve that is installed in the siphon pipe and switches between the drainage tank and the bathtub;
A controller that drains the waste water of the drainage tank to the bathtub side by filling the pipe of the tracking circuit with water and switching the switching valve to the drainage tank side;
An unnecessary water discharge device for a hot water supply / remembrance device.   5. The waste water discharge of the hot water supply / remaining device according to claim 4, wherein the changeover valve is switched to the drainage tank side during pouring of water into the bathtub or filling of water by additional circulation of bathtub water. apparatus.

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