KR20120042653A - Hot water supplying equipment - Google Patents

Abstract

PURPOSE: A hot-water supply device is provided to set silver ion concentration of the hot-water randomly by changing the operating time of a silver ion generator. CONSTITUTION: A hot-water supply device comprises a silver ion generator(50), a setting unit and a control unit. The silver ion generator comprises silver material electrodes installed in a hot-water supply path. The silver ion generator operates with generating the silver ion into the hot-water when the hot-water is supplied. The configuration method establishes the concentration of the silver ion included in the warm water of the predetermined amount. The setting unit sets the silver ion concentration included in the hot-water. The control unit controls operation of the silver ion generator based on the silver ion concentration set by the setting unit.

Description

Hot water supply device {HOT WATER SUPPLYING EQUIPMENT}

The present invention relates to a hot water supply device.

A hot water supply device for supplying hot water to a place of use, comprising a hot water storage tank, supplying hot water in the hot water storage tank to a bath, a hot water supply device, and a silver ion generator installed in a hot water supply pipe. Is known.

The silver ion generator includes a pair of silver electrodes facing each other in a hot water supply pipe, and a current flows through the hot water between the two electrodes by applying a voltage between these electrodes, thereby causing the current to flow from one silver electrode to the other. Generates silver ions moving to the silver electrode.

The silver ions are supplied to the bath with hot water. The silver ion exhibits high antibacterial activity. In addition, the antibacterial activity varies depending on the concentration of silver ions contained in the warm water.

Japanese Laid-Open Patent Publication No. 2006-145113

In general, a hot water supply device having a silver ion generator is provided with a control means for controlling the silver ion generator so that the concentration of the silver ions contained in the hot water after receiving the bath water becomes a certain concentration.

Here, the higher the concentration of silver ions contained in the hot water, the higher the antibacterial activity of the hot water is, and the control means of a general hot water supply device controls the silver ion generator so that the hot water has a high concentration of silver ions exhibiting high antibacterial activity. It is set to.

However, when the silver ion concentration exhibiting high antimicrobial power is used, the silver ion source of the silver ion generator is consumed severely, and the silver ion source is consumed even when the user does not need the high silver ion concentration. As a result, the user frequently exchanges the silver ion generating source of the silver ion generator, so that an unnecessary exchange cost is required.

Embodiment of this invention considered the said situation, The objective is to provide the hot water supply apparatus which a user can selectively use the hot water of optimal silver ion concentration.

The hot water supply device according to the embodiment of the present invention includes a silver ion generator provided with a silver electrode provided in a hot water supply path, which is operated at the time of supply of hot water to generate silver ions in the hot water, and a silver contained in a predetermined amount of hot water. Setting means for setting the concentration of the ions, and control means for controlling the operation of the silver ion generator based on the concentration of the silver ions set by the setting means.

  Thereby, the hot water supply device which can arbitrarily set the silver ion concentration of hot water by changing the operation time of a silver ion generator can be provided.

1 is a diagram showing the configuration of a hot water supply device according to an embodiment of the present invention.
2 is a perspective view showing the configuration of a storage tank and a peripheral portion of the hot water supply device according to the embodiment of the present invention.
3 is a block diagram showing a main part of a control unit of a hot water supply device according to an embodiment of the present invention.
4 is a diagram showing an operating time of a silver ion generator when the silver ion concentration according to the second embodiment of the present invention is set to 0.05 ppm.
5 is a flowchart for explaining the operation of the hot water supply device according to the second embodiment of the present invention.
Fig. 6 is a diagram showing other operating time of the silver ion generator when the silver ion concentration according to the second embodiment of the present invention is set to 0.05 ppm.
Fig. 7 is a diagram showing the operating time of the silver ion generator when the silver ion concentration according to the second embodiment of the present invention is set to 0.025 ppm.
FIG. 8 is a diagram showing an operating time of a silver ion generator when the silver ion concentration according to the second embodiment of the present invention is set to 0.0125 ppm.
9 is a diagram showing a display example of a display portion of an manipulator for operating a hot water supply device according to an embodiment of the present invention.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the drawings.

In FIG. 1, "1" is a hot water supply unit, and is connected to a water supply source (not shown) through the water supply pipe 2. The water in the water supply pipe 2 is decompressed by the pressure reducing valve 3 on the water supply pipe 2 and is led to the water supply pipe 4, and the water in the water supply pipe 4 is transferred to the storage tank 10 through the non-return valve 5. Led to the bottom. In addition, a part of the water depressurized by the pressure reducing valve 3 is led to the mixing faucet 12 through the water supply pipe 6 and the non-return valve 7 on the water supply pipe 6.

The mixing faucet 12 is connected to the upper portion of the hot water storage tank 10 through the hot water supply pipe 11, and the outlet of the mixing faucet 12 is the hot water supply pipe (hot water supply path) 13, the hot water supply pipe 13. It is connected to the bathtub 20 via the hopper 14 of the upper phase, the silver ion generator 50, and the flowmeter 30 which is a flow measuring means which measures a flow volume.

The flowmeter 30 is a flow measurement means for measuring the flow rate of the hot water passing through the hot water supply pipe 13 and the silver ion generator 50.

The first of the tub heat exchanger 17 through the hot water pipe 15 and the circulation pump 16 on the hot water pipe 15 at a position downstream from the installation portion of the silver ion generator 50 in the hot water supply pipe 13. The inlet of the flow path is connected, and the outlet of the first flow path is connected to the bath 20 through the hot water pipe 18.

That is, a portion of the hot water pipe 13 connected to the bath 20, the hot water pipe 15, the circulation pump 16, the first flow path of the bath heat exchanger 17, and the hot water pipe 18 are connected to the bath ( 20) a heat insulating flow path is formed for warming (also referred to as warming up again) the hot water.

An inlet of the second flow path of the bath heat exchanger 17 is connected to the hot water pipe 11 through a hot water pipe 31 and a non-return valve 32 on the hot water pipe 31, and the outlet of the second flow path is a hot water pipe. Reference numeral 33 and a circulation pump 34 on the hot water pipe 33 are connected to the upper portion of the hot water storage tank 10.

The mixing faucet 37 is connected to the hot water supply pipe 11 through the hot water supply pipe 35 and the check valve 36 on the hot water supply pipe 35, and the outlet of the mixing faucet 37 is connected through the hot water supply pipe 38. It is branched to a kitchen, a sink, a shower in a bathroom, and the like. Water mixed with the pressure reducing valve 3 in the water supply pipe 2 is guided to the mixing faucet 37, and the water is mixed with hot water from the hot water supply pipe 35.

An inlet of the water heat exchanger 82 of the heat source unit 80 is connected to the lower portion of the hot water storage tank 10 through a hot water pipe 41 and a circulation pump 42 on the hot water pipe 41. The outlet of the exchanger 82 is connected to the downstream position of the circulation pump 34 in the hot water pipe 33 through the hot water pipe 43.

The hopper 14 includes on-off valves 14a and 14b, check valves 14c and 14e and a flow sensor (flow detection means) 14d. The flow sensor (flow detection means) 14d detects the flow of hot water in the hot water supply pipe 13.

The heat source unit 80 transfers the refrigerant discharged from the compressor 81 to the compressor 81 through the water heat exchanger 82, the expansion valve 83, and the air heat exchanger 84, as indicated by the broken arrow in FIG. 1. It has a heat pump type refrigeration cycle to return, and also has the heat source unit control part 90, receives heat from outside air (it heat-exchanges and absorbs heat), and receives the received heat from the hot water exchanger 82 of hot water (hot water). Hot water guided from the pipe 41).

In addition, a hot water supply unit control unit 60 is provided in the hot water supply unit 1, and a remote control manipulator (hereinafter referred to as a remote controller) 70 and a heat source unit of the heat source unit 80 in the hot water supply unit control unit 60. The control unit 90 is connected.

The remote controller 70 may be installed near the bathtub 20, and may set operating conditions for the hot water supply unit 1 and the heat source unit 80. In addition, the remote control 70 is provided with a liquid crystal display 71 and an operation unit 72 as setting means for setting the silver ion concentration by the user.

The structure of the hot water storage tank 10 and its periphery is shown in FIG. The hot water supply unit control part 60 is attached to the side part of the hot water storage tank 10.

The main part of the hot water supply unit control part 60 is shown in FIG.

The hot water supply unit control unit 60 is a driving circuit connected to a power supply terminal 61 connected to a commercial AC power supply AC, an electricity supply path 62 to the power supply terminal 61, and a relay contact 65a on the electricity supply path 62. The furnace 63, the main control unit 64, the relay 65 connected to the main control unit 64, and the timer 66 connected to the main control unit 64 are provided. The remote control unit 70 and the heat source unit control unit 90 are connected to the main control unit 64. The silver ion generator 50 is connected to the drive circuit 63.

The drive circuit 63 drives the silver ion generator 50. The silver ion generator 50 has a pair of silver electrodes 51 and 52 opposed to each other disposed in the hot water supply pipe 13, and applies a voltage from the drive circuit 63 to each other of the electrodes 51 and 52. It operates by flowing a current through hot water between the positive electrodes 51 and 52, thereby generating silver (Ag) ions which are about to move from one silver electrode 51 to the other silver electrode 52.

The silver ions are supplied to the bath 20 together with the hot water in the hot water supply pipe 13. In addition, in the section from the installation position of the silver ion generator 50 to the connection part of the hot water pipe 15 at least in the hot water supply pipe 13, for example, an aluminum three-layer pipe that is subjected to insulation treatment for preventing a short circuit is used. .

The main control section 64 has the following means (1) to (7) as main functions.

(1) Control means for instructing the heat source unit control unit 90 of the heat source unit 80 to operate on during a predetermined time period, for example, a late night power time zone, and to operate (on) the circulation pump 42.

(2) Open control means for opening / closing valves 14a and 14b of hopper 14 when hot water supply (including bath water receiving and hot water replenishment) to bathtub 20 is instructed by operation of remote controller 70.

(3) means for counting the operating time T of the ion generator 50 by the timer 66.

(4) A setting control for operating the operation unit 72 to set the silver ion concentration, and to set (control) the silver ion generator operating time Ts based on the silver ion concentration set for the set bath water receiving amount La. Way.

(5) Immediately after the bath receiving operation is started, the relay 65 is operated to close the relay contact 65a, thereby energizing the silver ion generator 50 to operate the silver ion generator 50, and If the silver ion generator total operating time Ta according to the silver ion concentration is exceeded, the relay 65 is released to open the relay contact 65a, thereby interrupting the energization to the silver ion generator 50 to thereby prevent the silver ion generator from Energization control means for stopping the operation of (50).

(6) The open / close valve of the hopper 14 is detected (integrated) from the start of the operation of the hot water passing through the flowmeter 30 and the accumulated flow rate L reaches the set bath water receiving amount La. Closing control means for closing the 14a, 14b.

(7) Notification means for displaying on the liquid crystal display section 71 of the remote control unit 70 the silver ion concentration set by the operation of the operation unit 72, and the effect and precautions due to the silver ion concentration.

Next, the operation of the silver ion generator 50 will be described.

The silver ion generator 50 of this embodiment has a current value set so that the silver ion concentration becomes 0.05 ppm when it operates for about 30 l of hot water for 1 minute. The relationship between the operating time T and the silver ion concentration is changed by the current value.

Table 1 shows the relationship between the total operating time Ta of the silver ion generator 50 and the silver ion concentration with respect to the amount of bath water received in the bath 20.

As the user manipulates the operation unit 72 provided in the remote controller 70, the operation time of the silver ion generator 50 is set. The silver ion concentration of hot water can be set in three stages of 0.05 ppm, 0.025 ppm, and 0.0125 ppm.

Here, the operating time of the silver ion generator 50 shown in Table 1 is the total operating time Ta for the set amount of bath water received. For example, when the amount of bath water received is 130 l, if the total operating time Ta of the silver ion generator 50 is 4 minutes, the hot water having a silver ion concentration of 0.05 ppm becomes 2 minutes, and the total operating time Ta is 2 minutes. In this case, the silver ion concentration becomes 0.025 ppm, and when the total operating time Ta is 1 minute, the silver ion concentration becomes 0.0125 ppm.

The bath receiving operation for obtaining hot water of silver ion concentration of Table 1 is demonstrated.

In the late-night power time zone, the compressor 81 of the heat source unit 80 operates (on), and the refrigerant discharged from the compressor 81 passes through the water heat exchanger 82, the expansion valve 83, and the air heat exchanger 84. Circulated.

In connection with this, the circulation pump 42 operates (on), and the hot water at the lower portion of the hot water storage tank 10 passes through the hot water pipe 41 and flows into the water heat exchanger 82 to be heated. The hot water flowing out of the water heat exchanger 82 is supplied to the upper portion of the hot water storage tank 10 through the hot water pipe 43 and the hot water pipe 33. In this way, hot water is stored in the hot water storage tank 10.

When the bath water receiving operation is started by the operation of the remote controller 70, the opening / closing valves 14a and 14b of the hopper 14 are opened, and the hot water in the hot water storage tank 10 is supplied with the hot water supply pipe 11 and the mixed tap water. 12, the hot water supply pipe 13 and the silver ion generator 50 are supplied to the bath 20 to receive the bath water.

Here, the silver ion generator 50 is operated for the period of the silver ion generator total operation time Ta with respect to the bath water receiving amount La set from the start of bath water receiving operation, and then the silver ion generator 50 is operated. Stop and get bath water Driving continues. Then, the bath water is received until the accumulated flow rate L reaches the set bath water receiving amount La.

Thereby, after completion of the bath water receiving operation, hot water having a silver ion concentration set in the bath 20 is received.

In this way, the silver ion concentration of the hot water in the bath 20 can be arbitrarily set by changing the operation time of the silver ion generator 50 without changing the current value supplied to the silver ion generator 50.

Next, 2nd Embodiment is described using FIGS. 4-8.

1 to 3 in the second embodiment is the same as the first embodiment. The main control section 64 has the same functions (1) to (4), (6), and (7) as the first bath water receiving form, and controls the energization of the following (5A) instead of the energization control means (5). Means are provided.

(5A) Whenever the flowmeter 30 serving as the flow measurement means detects that the accumulated flow rate L of hot water has reached a predetermined amount, the relay 65 is operated to close the relay contact 65a. Thus, the silver ion generator 50 is energized to operate the silver ion generator 50.

When the operation time Ts of the silver ion generator according to the amount of bath water is exceeded, the relay 65 is released to open the relay contact 65a, thereby interrupting the energization of the silver ion generator 50 and Energization control means for repeating stopping the operation of the ion generator (50).

Specifically, the operating time Ts is a time for operating the silver ion generator 50 each time the water supply amount 30 l of the bath water is supplied, and within the period in which the hot water of the bath water amount La set in the tub 20 is stored. Therefore, the silver ion generator 50 repeatedly operates at the operating time Ts, and the operating time of the silver ion generator 50 as a whole almost coincides with the total operating time Ta.

For example, in the case of 130 L of bath water receiving amount, it becomes as shown with the graph of FIG. 4 and FIG. That is, as shown in FIG. 4, when the concentration is 0.05 ppm, the operating time Ts of the silver ion generator 50 is set to 1 minute, and the silver ion generator 50 is operated for 1 minute every 30 l hot water. The total operating time (Ta) is about 4 minutes until 130 l is heated.

For example, the operation | movement when the amount of bath water receiving 130l and the set silver ion concentration is 0.05 ppm by operation of the remote control 70 by the flowchart of FIG. 5 is demonstrated.

When the hot water supply (receiving the bath water) to the bathtub 20 is instructed by the operation of the remote controller 70, n = 1 is set (step 101), the opening / closing valves 14a and 14b of the hopper 14 are opened, and hot water The hot water in the storage tank 10 is supplied to the bath 20 through the hot water supply pipe 11, the mixing faucet 12, the hot water supply pipe 13, and the silver ion generator 50. At this time, the flow of hot water is detected by the flow sensor 14d, and the measurement of the accumulated flow rate L of the hot water passing through the flowmeter 30 is started (step 102).

Next, it is determined whether or not the integrated flow rate L has reached 30 l x n (step 103). Here, since the first time is n = 1, step 103 determines whether or not 30 l has been reached, and then the determination value of the integrated flow rate L changes as the value of n increases.

If the accumulated flow rate L reaches 30 l × n (YES in step 103), the accumulated flow rate L determined to have reached 30 l × n exceeds the target bath water receiving amount 130 l (La). It is judged whether or not (step 104), and if not exceeded (NO in step 104), the operation of the silver ion generator 50 is started (step 106). That is, the relay 65 operates to close the relay contact 65a, and the driving circuit 63 operates to close the silver ion generator 50.

At the same time as the operation of the silver ion generator 50, the timer 66, which is a counting means, starts counting the operating time Ts of the silver ion generator (step 106).

In step 107, it is determined whether the operating time Ts of the silver ion generator 50 has passed one minute Tsa.

If the operating time Ts is less than 1 minute (NO in step 107), the process returns to step 104 where the operation of the ion generator 50 is continued.

When the operating time Ts passes one minute Tsa, which is a predetermined time (YES in step 107), the operation of the silver ion generator is stopped (step 108). That is, the relay 65 is released and the relay contact 65a is opened. By the opening, the operation of the driving circuit 63 and the silver ion generator 50 is stopped.

Thereafter, n = n + 1 is set (step 109), the flow returns to step 103, and the integration flow rate L proceeds to the processing of the next value n + 1. That is, if the accumulated flow rate L reaches 60 l (30 l × 2) (YES in step 103), and the accumulated flow rate L does not exceed the set amount of bath water receiving capacity 130 l (La) (step No at 104), the silver ion generator 50 is operated again and the timer 66 restarts the measurement of the operating time Ts of the silver ion generator 50 (step 106).

While confirming that the accumulated flow rate L has not reached 130 l (La) until the operating time Ts is further 1 minute (Tsa) (NO in step 104), the ion generator 50 is turned on. The operation continues (No in step 107). Then, when the operating time Ts exceeds one minute Tsa (YES in step 107), the clocking by the timer 66 ends and the operation of the silver ion generator 50 ends (step 108). ). The cumulative flow rate L then proceeds to processing of the next value (n = n + 1) (step 109).

The above process is repeated until the integrated flow rate L reaches the set bath water receiving amount 130 l (La).

When the accumulated flow rate L reaches 130 l (La) of the set amount of bath water received by measurement of the flowmeter 30 (YES in step 104), the opening / closing valves 14a and 14b of the hopper 14 are closed. Hot water supply to the bathtub 20 is stopped (step 105). Moreover, as shown in the graph of FIG. 6, even if the operation time T of a silver ion generator does not reach a target, operation | movement of the silver ion generator 50 is stopped.

The operation of the silver ion generator 50 is stopped even when the bath receiving operation is forcibly terminated by the user operating the remote controller 70.

Here, as described above, the operating time Tsa of the silver ion generator 50 is 1 minute when a silver ion concentration of 0.05 ppm of hot water is obtained, but as shown in FIG. 7, the silver ion concentration is 0.025 ppm. In this case, the operating time Tsa is set to 30 seconds, and when the silver ion concentration as shown in Fig. 8 is 0.0125 ppm, the operating time Tsa is set to 15 seconds.

In addition, bath water receiving amount La is set by operation of the remote control 70.

Here, in the above-described embodiment, the silver ion generator 50 is operated for Tsa every time the accumulated flow rate L increases by 30 l when the set silver ion concentration is 0.05 ppm. For example, the accumulated flow rate L Whenever l) increases by 15 l, the silver ion generator 50 may be operated for Tsb minutes. In this case, the operating time Tsb of the silver ion generator 50 may be Tsa / 2.

In addition, when the bath water receiving amount is not set and the water level sensor (not shown) detects the target water level, if step 104 of the flowchart of FIG. 5 is changed to determine whether or not the value detected by the water level sensor exceeds the target water level. Other steps may be the same as the flowchart of FIG. 5.

As described above, silver ions are applied to the hot water supplied to the bath 20 by the bath water receiving operation. The antibacterial activity of the warm water supplied to the bath 20 by the silver ions can be increased, and the growth of various germs can be suppressed.

As in the second embodiment, by dispersing the silver ion generator 50 at a predetermined flow rate within the period during which the hot water is being applied, hot water having a silver ion concentration closer to the target concentration even when the bath water receiving operation is stopped on the way. It is possible to obtain a fine silver ion concentration control.

In addition, in any of the first and second embodiments, when the warming of the hot water in the bathtub 20 is instructed by the operation of the remote controller 70, the circulation pumps 16 and 34 are driven to operate the hot water in the bathtub 20. The hot water supply pipe 13, the hot water pipe 15, the first flow path of the tub heat exchanger 17, the hot water pipe 18 circulates through, and the hot water in the hot water storage tank 10 is hot water supply pipe 11 And circulates through the hot water pipe 31, the second flow path of the bath heat exchanger 17, and the hot water pipe 33. At this time, the heat of the hot water passing through the second flow path of the bath heat exchanger 17 is transferred to the hot water of the bathtub circulation passing through the first flow path. In this way, the hot water in the bathtub 20 is kept warm.

As described above, the user can arbitrarily set the silver ion concentration by the operation of the remote controller 70, and can obtain hot water having the necessary silver ion concentration according to the use situation.

This prevents the bath from blacking out by the use of high concentration (0.05 ppm) of silver ion hot water, suppresses the consumption of the silver ion generating source, and provides a low concentration (0.025 ppm) of the silver ion generator when the user wants to obtain proper antibacterial activity. , 0.0125 ppm).

In addition, when hot water having a silver ion concentration of 0.05 ppm or more that exhibits high antibacterial activity against ringworm is required, the user may set the silver ion generator to operate at a high concentration (0.05 ppm).

FIG. 9A illustrates the overall view of the remote controller 70. In FIG. 9B, the liquid crystal display unit 71 is a notification means for indicating and displaying silver ion concentration, efficacy and precautions at the concentration. Some enlarged views of) are shown.

When the user sets the concentration of silver ions by operating the operation unit 72 of the remote controller 70, the liquid crystal display 71 displays the set silver ion concentration, the efficacy and precautions at the set silver ion concentration, Information is provided for the user.

Based on this information, the user can arbitrarily select the required silver ion concentration, and can select the silver ion concentration according to an individual use situation.

Here, the silver ion concentration displayed on the liquid crystal display unit 71 is not limited to display by a numerical value such as 0.05 ppm, but may be display by words indicating the degree of high or low.

In addition, displays such as silver ion concentration, efficacy, and precautions may be alternately displayed in consideration of the size of the display of the liquid crystal display 71, the point of viewability, and the like.

In the above-described embodiment, the operation unit 71 for setting the concentration of silver ions and the liquid crystal display unit 71 as a notification unit are provided in the remote control unit 70, which is a remote control operation unit for operating and setting the bath water receiving operation. May be installed in the remote control device for ion setting.

The notifying means is not limited to visually notifying like the liquid crystal display 71, but may be audibly by voice such as a speaker.

In the above embodiment, the case where the silver ion generator 50 is installed in the hot water supply path to the bathtub 20 has been described as an example, but the same applies to the case where the silver ion generator 50 is installed in the hot water supply path to the kitchen or washroom. It is possible to implement. In addition to the hot water, the silver ion generator 50 may be installed in the supply path of the tap water to perform the same in the case of antibacterial tap water.

In addition, this invention is not limited to the said embodiment as it is, In an implementation step, a component can be modified and actualized in the range which does not deviate from the summary. Moreover, various inventions can be formed by combining suitably the several component disclosed in the said embodiment. You may delete some components from all components.

1: hot water supply unit 2, 4, 6: water supply pipe
3: pressure reducing valve 10: storage tank
11, 13, 35, 38: hot water supply pipe 12, 37: mixing faucet
14: Hopper 14a, 14b: on-off valve
14d: flow sensor (flow detection means) 30: flow meter
15, 18, 33, 41, 43: hot water pipes 16, 34, 42: circulation pump
17: bath heat exchanger 50: silver ion generator
51 and 52: silver electrode 60: hot water supply unit control unit
64: main controller 65: relay
66: timer 80: heat source unit
81: compressor 82: water heat exchanger
84: air heat exchanger 70: remote control
71: liquid crystal display unit 90: heat source unit control unit

Claims (3)

A silver ion generator provided with a silver electrode provided in a hot water supply path and operating at the time of supply of hot water to generate silver ions in the hot water,
Setting means for setting a concentration of silver ions contained in a predetermined amount of hot water, and
And control means for controlling the operation of the silver ion generator based on the concentration of silver ions set by the setting means. The method of claim 1,
Time means for indicating an operating time of the silver ion generator;
And a flow rate measuring means for measuring the flow rate of the hot water passing through the silver ion generator,
And the control means controls the operation of the silver ion generator in accordance with the operation time of the silver ion generator and the flow rate measured by the flow rate measuring means. The method according to claim 1 or 2,
The setting means is a hot water supply device characterized in that it comprises a notification means for notifying at least one of the concentration of the silver ions being set, efficacy and precautions.

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