JP5428876B2 - Water heater - Google Patents

Description

  The present invention relates to a water heater provided with a water level sensor for detecting the water level of a bathtub.

  Conventionally, in a water heater provided with a water level sensor for detecting the water level of a bathtub, the water level detection circuit using the water level sensor is adjusted during trial operation of the water heater (see, for example, Patent Document 1). By adjusting such a water level detection circuit, the water level of the bathtub can be detected by one type of water level sensor regardless of the number of floors in which the bathtub is installed.

JP 63-21438 A

  However, in the prior art described in Patent Document 1, when adjusting the water level detection circuit, it is necessary to have specialized knowledge that adjustment is performed with the adjustment volume of the water level detection circuit while hot water is applied to the bathtub. For this reason, when replacing a water level sensor for reasons, such as failure, it had the subject that the expert knowledge for adjusting a water level detection circuit was also needed.

  This invention has been made to solve the above-described problems, and can be replaced with an appropriate water level sensor corresponding to the installation floor of the target bathtub without the need for expertise to adjust the water level detection circuit. An object is to provide a water heater that can be used.

  A water heater according to the present invention is a water heater capable of supplying hot water to a bathtub, is attached to a bath water flow path connected to the bathtub, and detects the water level of the bathtub based on the pressure in the bath water flow path The water level sensor and the water level sensor currently installed in the bath water channel are water level sensors for the first and second floors that emit an output voltage that is equal to or higher than a predetermined voltage under the condition that the pressure in the bath water channel is a predetermined pressure, or And a sensor type determining means for determining whether or not the water level sensor for the third floor emits an output voltage lower than the predetermined voltage under the situation where the pressure in the bath water flow path is the predetermined pressure. When the output voltage of the water level sensor is equal to or higher than the predetermined voltage when the pressure in the bath water flow path is the predetermined pressure, the currently installed water level sensor is the water level sensor for the first to second floors. If the output voltage of the water level sensor is less than the predetermined voltage when the pressure in the bath water flow path is the predetermined pressure, the currently installed water level sensor is the water sensor for the third floor. And a display means for displaying the determination result of the water level sensor type by the sensor type determination means in text or voice.

  According to the present invention, even if there is no specialized knowledge for adjusting the water level detection circuit, the water level sensor can be replaced with an appropriate water level sensor according to the installation floor number of the target bathtub.

It is the schematic which shows the whole structure of the hot water storage type water heater in Embodiment 1 of this invention. FIG. 2 is a diagram showing the head-output voltage characteristics. It is an external view of the remote controller shown in FIG. It is a flowchart which shows the process performed in Embodiment 1 of this invention. It is an external view of the remote controller in Embodiment 2 of this invention. It is a flowchart which shows the process performed in Embodiment 2 of this invention.

Embodiment 1 FIG.
Embodiment 1 of the present invention will be described below with reference to the drawings. Note that the present invention is not limited to the embodiments.

  FIG. 1 is a schematic diagram showing an overall configuration of a hot water storage type hot water heater 1 according to Embodiment 1 of the present invention. A hot water storage type water heater 1 shown in FIG. 1 has a function of boiling low-temperature water such as city water into hot water with a heat source machine and supplying hot water to a desired location, and a function of replenishing the bath water 2a in the bathtub 2. The heat pump unit 3, the tank unit 4, and the control device 5 are provided. Moreover, although the hot water storage type water heater 1 can correspond to any of the first to third floors as the installation floor number of the bathtub 2, here, a configuration in which the bathtub 2 is installed on the first floor is taken as an example. explain. Hereinafter, each component of the hot water storage type water heater 1 will be described.

  The heat pump unit 3 includes a compressor 7 for compressing a refrigerant, a heat exchanger 8 for boiling, an expansion valve 9, an evaporator 10, and a refrigerant circulation pipe 11 that connects these in an annular shape in a unit case 6. And functions as a heat source machine. On the other hand, the tank unit 4 includes a hot water storage tank 12, a water supply line 13, a hot water circulation line 14, a hot water supply line 15, a primary side circulation line 16, a secondary side circulation line 17, and an additional heat exchange. A container 18 is provided.

  The hot water storage tank 12 is a stacked hot water storage tank that stores low-temperature water supplied from the water supply pipe 13 and stores hot water boiled by the heat pump unit 3. Below the hot water storage tank 12, a water introduction port 12a to which the water supply pipe 13 is connected and a water outlet 12b to which the forward pipe 14a of the hot water circulation pipe 14 is connected are provided. At the upper part of the tank 12, a hot water inlet 12c to which the return pipe 14b of the hot water storage circulation line 14 is connected and a hot water outlet 12d to which the hot water supply pipe 15 is connected are provided. The hot water storage tank 12 is always kept full.

  The water supply pipe 13 is a pipe that supplies low-temperature water such as city water to the hot water storage tank 12, the hot water supply pipe 15, and a predetermined hot water supply destination, and the first to third water supply pipe portions 13 a to 13 c and the pressure reducing valve 19. have. The first water supply pipe section 13a connects a water source (not shown) such as a water supply and the water introduction port 12a of the hot water storage tank 12, and the second water supply pipe section 13b branches from the first water supply pipe section 13a, and the first A water supply pipe portion 13a is connected to a first mixing valve 20 and a second mixing valve 21 described later, and a third water supply pipe portion 13c branches from the first water supply pipe portion 13a and a predetermined hot water supply with the first water supply pipe portion 13a. It is configured to connect the other end. In the configuration example shown in FIG. 1, one hot water tap 22 is shown as an example of a hot water supply destination. The pressure reducing valve 19 is provided on the downstream side of the branch point of the third water supply pipe part 13c in the first water supply pipe part 13a, and is a valve for adjusting the water source water pressure to be a predetermined value or less. In FIG. 1, the flow direction of the low temperature water in the 1st water supply pipe part 13a is shown by the solid line arrow.

  The hot water storage circulation line 14 is a pipe that reaches the hot water inlet 12c of the hot water storage tank 12 from the water outlet 12b of the hot water storage tank 12 through the boiling heat exchanger 8 in the heat pump unit 3. It has an outward pipe 14a provided with a water pump 24 and a return pipe 14b. The forward pipe 14a connects the water outlet 12b and the boiling heat exchanger 8, and the return pipe 14b connects the boiling heat exchanger 8 and the hot water inlet 12c.

  The hot water supply line 15 is a hot water having a predetermined temperature as a result of the hot water stored in the upper part of the hot water storage tank 12 and the low temperature water from the water supply pipe 13 being mixed by the first mixing valve 20 or the second mixing valve 21. 1 to the third hot water supply pipe portion 15a in addition to the first mixing valve 20 and the second mixing valve 21. ~ 15c. The first hot water supply pipe portion 15a connects the hot water outlet 12d of the hot water storage tank 12 to the first and second mixing valves 20 and 21, and the second hot water supply pipe portion 15b connects to the first mixing valve 20 and the secondary side circulation line 17. The third hot water supply pipe portion 15c is configured to connect the second mixing valve 21 and the hot water tap 22 to each other. In FIG. 1, the outflow direction of hot water from the hot water tap 22 is indicated by a dashed arrow.

  The primary-side circulation pipe 16 is a pipe that reaches the lower part of the hot water storage tank 12 from the hot water outlet 12d of the hot water storage tank 12 via the heat exchanger 18 for reheating, and the forward pipe 16a and the primary side water supply And a return pipe 16b provided with a pump 25. The forward pipe 16a connects the hot water outlet 12d of the hot water storage tank 12 to the hot water inlet 18a above the reheating heat exchanger 18, and the return pipe 16b connects the hot water outlet 18b below the reheating heat exchanger 8 and the hot water storage tank. It is comprised so that the lower part of 12 may be connected. In the example shown in FIG. 1, a predetermined section on the hot water storage tank 12 side in the first hot water supply pipe section 15a also serves as a section on the hot water storage tank side in the forward pipe 16a.

  The secondary-side circulation pipe 17 is a pipe that returns from the bathtub 2 to the bathtub 2 again via the heat exchanger 18 for remedy, and the return pipe 17a provided with the secondary-side water supply pump 26 and the return pipe 17b. The forward pipe 17a connects the bathtub 2 and the bath water inlet 18d at the lower part of the heat exchanger 18 for reheating, and the return pipe 17b connects the bath outlet port 18c at the upper part of the heat exchanger 18 for hot water and the bathtub 2. It is configured.

  The memorial heat exchanger 18 heats the bath water 2a by exchanging heat between the hot water flowing through the primary circulation circuit 16 and the bath water 2a flowing through the secondary circulation circuit 17. In the example shown in FIG. 1, it is assumed that a plate-type water-water heat exchanger in which a plurality of heat transfer plates are stacked in the height direction of the heat exchanger 18 for tracking is used. In order to be able to connect each of the primary side circulation line 16 and the secondary side circulation line 17, the hot water inlet 18 a and the bath water outlet 18 c described above are provided at the upper part of the heat exchanger 18 for remedy. However, the above-described hot water outlet 18b and bath water inlet 18d are provided in the lower part.

  The second hot water supply pipe portion 15b of the hot water supply pipe line 15 has a hot water beam that opens and closes the second hot water supply pipe portion 15b in order to pour the mixed water adjusted to a predetermined temperature by the first mixing valve 20 into the bathtub 2. A solenoid valve 27 and a flow rate sensor 28 for detecting the amount of molten water poured into the bathtub 2 are installed. In addition, the return pipe 17b of the secondary side circulation pipe 17 has a flow of the bath water 2a which is sucked into the secondary side circulation pipe 17 by the secondary side water supply pump 26 via the forward pipe 17a and circulated. A circulation sensor 29 for detecting the above is attached. Further, a pressure type water level sensor for detecting the water level of the bathtub 2 based on the water pressure of the bath water 2a led from the bathtub 2 to the return pipe 17b is provided in the return pipe 17b of the secondary side circulation pipe 17. 30 is attached.

  Among the above-described constituent members constituting the tank unit 4, each of the water supply pipe 13, the hot water storage circulation pipe 14, the hot water supply pipe 15, and the secondary side circulation pipe 17 is part of the unit case 31. It extends to the outside, and the remaining components are housed in the unit case 31.

  The control device 5 includes a control device main body 5a disposed in the unit case 31 and a remote controller 5b disposed in a kitchen or bathroom and connected to the control device main body 5a by wire or wirelessly. . The control device main body 5a includes a heat pump unit 3, a first mixing valve 20, a second mixing valve 21, a hot water storage water pump 24, a primary water pump 25, a secondary water pump 26, a hot water solenoid valve 27, a flow rate. A sensor 28, a circulation switch 29, and a water level sensor 30 are connected to each other.

  The control device main body 5a controls the operation of the devices connected to the control device main body 5a in accordance with information, instructions, etc. input by the user to the remote controller 5b functioning as an input device of the control device main body 5a. Therefore, the hot water storage type hot water heater 1 operates based on the above-described information, commands, etc., input by the user to the remote controller 5b. For example, when the boiling start time input by the user to the remote controller 5b is reached, the heat pump unit 3 and the hot water storage water pump 24 are activated and the boiling operation is started under the control of the control device 5. The boiling operation is continued until it is determined from the detection result of a temperature sensor (not shown) provided in the hot water storage tank 12 that a predetermined amount of hot water is stored in the hot water storage tank 12. During this boiling operation, low-temperature water flows from the water outlet 12b at the lower part of the hot water storage tank 12 into the hot water storage circulation line 14 and is heated to hot water by the heat pump unit 3 so as to be heated at the upper part of the hot water storage tank 12 at the hot water inlet 12c. To the hot water storage tank 12.

  When the user inputs a hot water operation start command to the remote controller 5b, the hot water solenoid valve 27 provided in the second hot water supply pipe portion 15b opens under the control of the control device 5, and the second hot water supply pipe portion. The first mixing valve 20 is controlled so that the detected hot water temperature of a temperature sensor (not shown) provided in 15b becomes the hot water temperature preset by the user in the remote controller 5b. Thereby, supply of the bath water 2a to the bathtub 2 is started from the 2nd hot water supply pipe part 15b via the secondary side circulation conduit 17. Subsequently, when the flow rate sensor 28 detects that the supply amount of the bath water 2a has reached a predetermined amount, the control device 5 determines that the bath water 2a in the bathtub 2 has reached a predetermined amount, and the hot water electromagnetic wave The valve 27 is closed and the hot water operation is terminated.

  Further, when the user inputs a start command of the memorial operation to the remote controller 5b, the primary side water pump 25 and the secondary side water pump 26 are activated and the memorial operation is started under the control of the control device 5. The This chasing operation is continued, for example, until it is determined that the bath water 2a in the bathtub 2 has been heated to a predetermined temperature from the detection result of a temperature sensor (not shown) disposed in the forward pipe 17a.

  In the hot water storage type water heater 1 having the above-described configuration, as the water level sensor 30 for detecting the water level of the bathtub 2, two types of water level sensors, that is, a water level sensor 30a for the first and second floors and a water level sensor 30b for the third floor are provided. It is prepared. And the water level sensor to be used is selected according to the floor number in which the bathtub 2 is installed. For example, in the example shown in FIG. 1, since the bathtub 2 is installed on the first floor, the regular water level sensor to be provided as the water level sensor 30 is the water level sensor 30a for the first and second floors.

  In this embodiment, since it has the characteristic in the water head-output voltage characteristic of the water level sensor 30, it explains in full detail with reference to FIG. FIG. 2 is a diagram showing such a water head-output voltage characteristic, where the horizontal axis is the water head (m) applied to the water level sensor 30, and the vertical axis is the output voltage (V) of the water level sensor 30. .

  As shown in FIG. 2, the water level sensor 30a for the first and second floors is a bathtub when the bathtub 2 is installed on the second floor from the bottom surface height of the bathtub 2 when the bathtub 2 is installed on the first floor of a general house. Corresponding to the height of the upper surface of 2, the output voltage is set to change in the range of 0 m to 3 m of water head. On the other hand, the water level sensor 30b for the third floor changes the output voltage in the range from 4 m to 7 m of the water head corresponding to the height of the upper surface of the bathtub 2 when the bathtub 2 is installed on the third floor of a general house. It is set to be. In the third floor water level sensor 30b, the rate of change of the output voltage with respect to the range of water heads 4m to 7m is set to be the same as the rate of change of the output voltage with respect to the range of water head 0m to 3m in the first and second floor water level sensors 30a.

  In addition, the water level sensor 30a for the first and second floors has a voltage equal to or higher than a predetermined voltage in a state where atmospheric pressure is applied (a state in which the bath water 2a is not retained in the return pipe 17b of the secondary side circulation pipe 17). It is set to output. The other water level sensor 30b for the third floor is set so that a voltage lower than the predetermined voltage is output when atmospheric pressure is applied. The predetermined voltage here is greater than the minimum output voltage of each of the first and second floor water level sensors 30a and the third floor water level sensor 30b, and when atmospheric pressure is applied to the first and second floor water level sensors 30a. It is a voltage set in the range below the output voltage. The minimum output voltage of the water level sensor 30a for the first and second floors is not shown in FIG. 2, but is the same as the minimum output voltage of the water level sensor 30b for the third floor.

  FIG. 3 is an external view of the remote controller 5b shown in FIG. The remote controller 5b has a feature in the display unit 32, and will be described in detail with reference to FIG. The display unit 32 displays an operation setting state and an operation state of the hot water storage type water heater 1, and further includes a water level sensor type display unit 32 a that displays the type of the water level sensor 30 currently attached in characters. Yes. The remote controller 5b includes a bath automatic switch 33 for performing hot water on the bathtub 2, a hot water switch 34 for performing a bath operation, a bath water amount switch 35 for setting a hot water completion water level, and a bathtub. The bath temperature switch 36 for setting the bath water temperature in 2 and the hot water temperature switch 37 for setting the hot water temperature are provided.

  FIG. 4 is a flowchart showing processing executed to determine the type of the water level sensor 30 currently attached to the hot water storage type hot water heater 1. As shown in FIG. 4, the control device 5 first determines whether or not the hot water solenoid valve 27 is opened (step S1). As a result, when the hot water solenoid valve 27 is opened, the output voltage of the water level sensor 30 is not compared with the predetermined voltage. On the other hand, when the hot water solenoid valve 27 is not open, the water level sensor is not compared. Comparison between the output voltage of 30 and the predetermined voltage is performed (step S2).

  More specifically, in step S2, it is determined whether or not the output voltage of the water level sensor 30 currently attached is equal to or higher than the predetermined voltage. As a result, when it is determined that the detected output voltage of the water level sensor 30 is equal to or higher than the predetermined voltage, the type of the water level sensor 30 currently attached is the first or second floor water level sensor 30a, and the control device 5 (Step S3).

  On the other hand, when it is determined in step S2 that the detected output voltage of the water level sensor 30 is less than the predetermined voltage, the type of the water level sensor 30 that is currently attached is controlled as the water level sensor 30b for the third floor. It is stored in the device 5 (step S4).

  Next, it is determined whether or not the type of the water level sensor 30 stored in the control device 5 is the 1st to 2nd floor water level sensor 30a (step S5). As a result, if the type of the stored water level sensor 30 is the 1st to 2nd floor water level sensor 30a, “use the 1st to 2nd floor water level sensor” is displayed on the water level sensor type display portion 32a of the remote controller 5b. (Step S6). On the other hand, when it is determined that the type of the stored water level sensor 30 is not the first or second floor water level sensor 30a, that is, it can be determined that the stored type of the water level sensor 30 is the third floor water level sensor 30b. In this case, “use of water level sensor for the third floor” is displayed on the water level sensor type display portion 32a of the remote controller 5b (step S7).

  According to the hot water storage type water heater 1 of the present embodiment, as shown in FIG. 2, two types of water level sensors 30a and 30b in which the water head-output voltage characteristics are set are prepared, and the above FIG. By determining whether or not the output voltage of the water level sensor 30 is equal to or higher than the predetermined voltage by the processing of the flowchart shown in FIG. It can be determined whether the type of the water level sensor 30 is the 1st to 2nd floor water level sensor 30a or the 3rd floor water level sensor 30b. And according to the said process, the kind of the water level sensor 30 determined to be attached now is displayed on the water level sensor kind display part 32a of the remote controller 5b. As a result, when the user performs the replacement work of the water level sensor 30, it is only necessary to replace the water level sensor 30 in accordance with the display of the remote controller 5b, so that it is possible to replace the water level sensor 30 without specialized knowledge. .

  In addition, as described above, in the head-supply voltage characteristic shown in FIG. 2, when atmospheric pressure is applied, the water level sensor 30a for the first and second floors outputs a voltage equal to or higher than the predetermined voltage, and the water for the other third floor is supplied. The position sensor 30b is set to output a voltage lower than the predetermined voltage. Here, when the mixed water stays in the return pipe 17b, even if the water level sensor 30b for the third floor is attached, the water level is increased by applying pressure to the water level sensor 30 for the head of the mixed water. The output voltage of the sensor 30 becomes a value equal to or higher than the predetermined voltage. That is, in the case where the mixed water stays in the return pipe 17b, if the output voltage of the water level sensor 30 is compared with the predetermined voltage, the water level sensor 30b for the third floor is actually attached. Even in this case, it may be erroneously determined that the water level sensor 30a for the first or second floor is attached. On the other hand, according to the process shown in FIG. 4, when the hot water solenoid valve 27 is not opened, the output voltage of the water level sensor 30 is compared with the predetermined voltage. When the hot water solenoid valve 27 is not open, the mixed water fed from the hot water solenoid valve 27 does not stay in the return pipe 17b of the secondary-side circulation conduit 17. In such a state, the output voltage when atmospheric pressure is applied can be detected as the output voltage of the water level sensor 30. Therefore, when the hot water solenoid valve 27 is not opened by the above processing (when atmospheric pressure is applied), the type of the water level sensor 30 is determined, thereby changing the water level sensor 30b for the third floor to the water level sensor 30a for the first and second floors. It is possible to accurately determine the type of the water level sensor 30 without making a mistaken determination.

Embodiment 2. FIG.
FIG. 5 is an external view of a remote controller 5b according to the second embodiment of the present invention. The display unit 32 of the remote controller 5b of the present embodiment displays a warning level with characters that prompt the replacement of the water level sensor 30 when a water level sensor 30 of a type that does not correspond to the installation floor of the bathtub 2 is attached. It is characterized in that it includes a sensor replacement display part 32b.

  FIG. 6 is a flowchart showing a process executed in the second embodiment of the present invention in order to determine whether or not the water level sensor 30 attached to the hot water storage type water heater 1 is a regular water level sensor. As shown in FIG. 6, the control device 5 first determines whether or not the normal type of the water level sensor 30 (which should be provided according to the number of floors installed in the bathtub 2) is stored in the control device 5. (Step S10).

  As a result, when the type of the normal water level sensor 30 is stored in the control device 5, the output voltage of the water level sensor 30 when the atmospheric pressure is applied is the predetermined voltage in a state where the hot water solenoid valve 27 is not opened. It is determined whether or not this is the case (step S11). As a result, when it is determined that the output voltage of the water level sensor 30 is equal to or higher than the predetermined voltage, it can be determined that the currently installed water level sensor 30 is the water level sensor 30a for the first and second floors. In this case, it is then determined whether or not the type of the water level sensor 30 stored in the control device 5 is the 1st to 2nd floor water level sensor 30a (step S12).

  In step S12, when it is determined that the type of the water level sensor 30 stored in the control device 5 is the water level sensor 30a for the first or second floor, “1 to 1” is displayed on the water level sensor replacement display unit 32b of the remote controller 5b. "Use of water sensor for second floor" is displayed (step S13). On the other hand, when the determination in step S12 is not established, that is, when it can be determined that the type of the water level sensor 30 stored in the control device 5 is the water level sensor 30b for the third floor, the water level sensor replacement display of the remote controller 5b. The section 32b displays “Please replace with a water sensor for the third floor” (step S14).

  Moreover, when it determines with the output voltage of the water level sensor 30 being less than predetermined voltage in said step S11, it can be judged that what is currently attached is the water level sensor 30b for 3rd floors. In this case, it is then determined whether or not the type of the water level sensor 30 stored in the control device 5 is the 1st to 2nd floor water level sensor 30a (step S15).

  In step S15, when it is determined that the type of the water level sensor 30 stored in the control device 5 is the 1st to 2nd floor water level sensor 30a, the water level sensor replacement display unit 32b of the remote controller 5b displays “1 to 1”. Please replace with a water sensor for the second floor ”is displayed (step S16). On the other hand, if the determination in step S15 is not established, that is, if it can be determined that the type of the water level sensor 30 stored in the control device 5 is the water level sensor 30b for the third floor, the water level sensor replacement display of the remote controller 5b is displayed. The section 32b displays “use of water level sensor for the third floor” (step S17).

  Also in the second embodiment, as the water level sensor 30, two types of water level sensors 30a for the first and second floors and a water level sensor 30b for the third floor are prepared according to the number of installation floors of the bathtub 2, and the hot water storage water heater 1 The water level sensor 30 corresponding to the installation floor number of the bathtub 2 is attached in advance. Then, according to the process of the flowchart shown in FIG. 6 described above, it is determined whether or not the water level sensor 30 attached in advance and the replaced water level sensor 30 are the same. If it is wrong, that is, if the water level sensor 30 is replaced with a normal water level sensor 30 (stored in the control device 5) that is pre-installed in the hot water storage type hot water heater 1, the remote controller 5b is used. Is displayed to prompt the user to replace the water level sensor 30 with a regular water level sensor. As a result, when the user performs the replacement work of the water level sensor 30, it is only necessary to replace the water level sensor 30 in accordance with the display of the remote controller 5b, so that it is possible to replace the water level sensor 30 without specialized knowledge. .

  By the way, in Embodiment 1 mentioned above, the water level sensor type display part 32a is provided in the display part 32 of the remote controller 5b as a display means which displays the determination result of the type of the water level sensor 30 by a character. In the second embodiment described above, the remote controller is used as a display means for displaying, in a letter, a message that prompts the normal water level sensor 30 to be replaced when the water level sensor 30 is different from the normal water level sensor 30. The display unit 32 of 5b is provided with a water level sensor replacement display unit 32b. However, in the present invention, the display means is not limited to a means for displaying the determination result of the type of the water level sensor or prompting the replacement of the water level sensor in characters, and means for informing them by voice (for example, to the remote controller 5b). It may be a provided speaker (not shown).

  Further, in the first and second embodiments described above, the water level sensor 30 is attached to the return pipe 17b of the secondary side circulation pipeline 17. However, the bath water flow path to which the water level sensor is attached in the present invention is not limited to this, and may be, for example, the forward pipe 17 a of the secondary circulation pipe 17.

DESCRIPTION OF SYMBOLS 1 Hot water storage type hot-water supply machine 2 Bathtub 5 Control apparatus 5a Control apparatus main body 5b Remote controller 16 Primary side circulation line 17 Secondary side circulation line 30 Water level sensor 30a 1-2 level water level sensor 30b 3rd floor water level sensor 32 Remote Controller display section 32a Water level sensor type display section 32b Water level sensor replacement display section

Claims (4)

A water heater that can supply hot water to a bathtub,
A water level sensor attached to the bath water flow path connected to the bathtub and detecting the water level of the bath based on the pressure in the bath water flow path;
The water level sensor currently attached to the bath water flow path is a water level sensor for 1st or 2nd floor that emits an output voltage equal to or higher than a predetermined voltage in a situation where the pressure in the bath water flow path is a predetermined pressure, or Sensor type determination means for determining whether the water level sensor for the third floor emits an output voltage lower than the predetermined voltage under the condition that the pressure in the bath water flow path is the predetermined pressure;
When the output voltage of the water level sensor is equal to or higher than the predetermined voltage when the pressure in the bath water flow path is the predetermined pressure, the currently installed water level sensor is the sensor type determination unit. When the water level sensor is determined to be a floor water level sensor and the output voltage of the water level sensor is less than the predetermined voltage under the condition that the pressure in the bath water flow path is the predetermined pressure, the currently installed water level sensor is It is determined to be a water level sensor for the third floor,
A water heater, further comprising a notifying means for notifying the determination result of the type of the water level sensor by the sensor type determining means by text or voice.   The hot water heater according to claim 1, wherein the notification means is a character display unit provided in a remote controller for remotely controlling the hot water heater. The predetermined pressure is atmospheric pressure;
The bath water flow path functions as a flow path for supplying hot water to the bathtub,
When the hot water is supplied to the bathtub, the water heater is provided in the bath water flow path at a location upstream of the water level sensor from the water level sensor, and controls the supply of hot water to the bathtub. Further comprising
The hot water heater according to claim 1 or 2, wherein the sensor type determination unit determines the type of the water level sensor in a state where the electromagnetic valve is closed.   When the water level sensor of the type determined by the sensor type determination unit is of a different type from the normal water level sensor that should be provided in the water heater, the notification unit is replaced with the normal water level sensor. The hot water supply device according to any one of claims 1 to 3, wherein notification is made by a character or voice prompting the user.

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