Water heater remote control

Abstract

To suppresses radio interference from external devices.SOLUTION: A water heater remote control 10 includes a remote control board 11 on which an intercom circuit 12 is mounted, a wireless communication control unit 15 that controls wireless communication, and a wireless radio wave source 16 having an antenna 17 that outputs radio waves. The wireless communication control unit 15 and the wireless radio wave source 16 are located on the front side of the remote control board 11, and the intercom circuit 12 is located on the back side of the remote control board 11. A shielding member 20 that blocks radio waves is located around at least the area of the remote control board where the wireless communication control unit and the wireless radio wave source are located and in a portion corresponding to the back side.SELECTED DRAWING: Figure 2C

Description

Technical Field

[0001] The present invention relates to a water heater remote control.

Background Art

[0002] Conventionally, there is a system for remotely operating a water heater installed outdoors with a water heater remote control installed indoors, such as in a kitchen (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, as will be described below, the conventional water heater remote control described in Patent Document 1 is susceptible to interference from radio waves output from an external device, and there is a concern that noise may occur in the intercom voice between the built-in remote controls.

[0005] Hereinafter, referring to FIG. 8, the problems of the conventional water heater remote control will be described. FIG. 8 is an explanatory diagram of the problems of the conventional water heater remote control 10Old. For example, as shown in FIG. 8, the conventional water heater remote control 10Old is installed on a wall surface such as in a kitchen, and furthermore, an external device such as an indoor intercom 120 having an intercom function may be installed on a wall surface near any of its top, bottom, left, or right. In this case, the conventional water heater remote control 10Old may be affected by interference from radio waves output from the indoor intercom 120, and noise may occur in the intercom between the built-in remote controls.

[0006] The present invention has been made to solve the above-described problems, and a main object thereof is to provide a water heater remote control that suppresses radio wave interference from an external device.

Means for Solving the Problems

[0007] To achieve the above objective, the present invention provides a water heater remote control comprising: a remote control board on which an intercom circuit is mounted; a wireless communication control unit for controlling wireless communication; and a radio wave source having an antenna for emitting radio waves, wherein the wireless communication control unit and the radio wave source are arranged on the front side of the remote control board, the intercom circuit is arranged on the rear side of the remote control board, and a shielding member for blocking radio waves is arranged around the area where the wireless communication control unit and the radio wave source are provided and in the area corresponding to the rear side of the remote control board. Other methods will be described later. [Effects of the Invention]

[0008] According to the present invention, radio wave interference from external devices can be suppressed. [Brief explanation of the drawing]

[0009] [Figure 1] This is a configuration diagram of a water heater system including a water heater remote control according to the embodiment. [Figure 2A] This is a front view of the water heater remote control according to the first embodiment. [Figure 2B] This is a rear view of the water heater remote control according to the first embodiment. [Figure 2C] This is a side view of the water heater remote control according to the first embodiment. [Figure 3A] This is a front view of the water heater remote control according to the second embodiment. [Figure 3B] This is a rear view of the water heater remote control according to the second embodiment. [Figure 3C] This is a side view of the water heater remote control according to the second embodiment. [Figure 4A] This is a front view of a water heater remote control with a wireless communication board according to the second embodiment positioned at the front. [Figure 4B] This is a rear view of a water heater remote control with a wireless communication board according to the second embodiment positioned at the front. [Figure 4C]It is a side view of a hot water supply machine remote control with a wireless communication board according to the second embodiment arranged forward. [Figure 5A] It is a front view of a hot water supply machine remote control of the third embodiment. [Figure 5B] It is a front view of a wireless communication board (separate board) of a hot water supply machine remote control of the third embodiment. [Figure 5C] It is a side view of a hot water supply machine remote control of the third embodiment. [Figure 6A] It is a front view of a hot water supply machine remote control of the fourth embodiment. [Figure 6B] It is a rear view of a hot water supply machine remote control of the fourth embodiment. [Figure 6C] It is a side view of a hot water supply machine remote control of the fourth embodiment. <000也0079> [Figure 7] It is a configuration diagram of a hot water supply machine system of a modified example. [Figure 8] It is an explanatory diagram of problems of a conventional hot water supply machine remote control. <00也0084>

Embodiments for Carrying Out the Invention

[0010] Hereinafter, embodiments of the present invention (hereinafter referred to as "the present embodiment") will be described in detail with reference to the drawings. Note that each figure only schematically shows the present invention to such an extent that it can be sufficiently understood. Therefore, the present invention is not limited only to the illustrated examples. Also, in each figure, common components and similar components are denoted by the same reference numerals, and redundant descriptions thereof are omitted.

[0011] Note that since there are also the following problems in a conventional hot water supply machine remote control, the present embodiment is also intended to provide a hot water supply machine remote control that can solve the following problems.

[0012] (1) Among conventional water heater remote controls, there are some that are installed on the wall surface in the kitchen or the like, separated from external devices such as the indoor door phone 120 (Fig. 8), so that no noise occurs in the intercom voice between the built-in remote controls. For the water heater remote control with this configuration, there is a problem that sufficient space for installation separated from external devices such as the indoor door phone 120 (Fig. 8) must be secured.

[0013] (2) Among conventional water heater remote controls, in order to eliminate the need to secure sufficient space on the wall surface in the kitchen or the like, an opening is provided on the wall surface, a switch box is installed inside the opening, a wireless adapter for wireless connection is installed in the switch box, and the water heater remote control is housed in the opening of the switch box. And the water heater remote control with this configuration reduces radio wave interference by performing control such as stopping the wireless output during intercom calls. However, the following problems can be considered for the water heater remote control with this configuration. If the switch box is installed arbitrarily, a case where it is not installed is assumed. At this time, there is no place to fix the wireless adapter for wireless connection, and it is conceivable that the wireless adapter is suspended inside the wall. In that case, there is a risk that stress will be applied to the connection cord, and disconnection or communication abnormality may occur. On the other hand, when a switch box is provided, means for fixing the wireless adapter inside the box is required. Although the fixing member uses an adhesive tape and the fixing position is specified, assuming a case where it is arranged at an unintended position due to poor construction, the radio wave intensity of the wireless adapter may decrease. On the other hand, when replacing the water heater, it may be necessary to newly provide a switch box on the wall surface. In view of the problems related to the installation of the switch box, etc., it is also necessary to consider a method for fixing the wireless adapter. Depending on the installation location, it is assumed that the wireless adapter may be affected by radio wave interference from metal members, reinforcing bars, steps, and various external devices inside the wall of the customer's house, and if the radio wave intensity of the wireless adapter decreases, it is considered that it will be very difficult to identify the cause.

[0014] <Configuration of a water heater system including a water heater remote control> The configuration of the water heater system 1000, including the water heater remote control 10 according to this embodiment, will be described below with reference to Figure 1. Figure 1 is a configuration diagram of the water heater system 1000, including the water heater remote control 10 according to this embodiment.

[0015] In the example shown in Figure 1, the water heater system 1000 includes a water heater 100, a water heater remote control 10, a wireless router 110, a network N1, a server S1, and a smartphone 111.

[0016] The water heater 100 is a residential appliance that heats water and supplies it to the public. In this embodiment, the explanation will assume that the water heater 100 is configured as a heat pump water heater that utilizes not only electricity but also ambient heat.

[0017] The water heater remote control 10 is a remote control (remote controller) for remotely operating the water heater 100. The water heater remote control 10 mainly consists of a bathroom remote control (not shown) installed on the bathroom wall and a kitchen remote control (not shown) installed on the kitchen wall. The bathroom remote control and kitchen remote control are each provided with dedicated buttons (not shown) (operation button, water temperature adjustment button, and call button). The call button is pressed when a user communicates with the bathroom remote control and the kitchen remote control. The water heater remote control 10 has a remote control board 11 as described later and a wireless communication board 14 as described later. The wireless communication unit 14 may be a board.

[0018] The wireless router 110 is a device that relays communications based on a predetermined communication protocol installed in the customer's premises. In other words, the wireless router 110 has the function of connecting the wireless communication unit 14, described later, to the network N1.

[0019] The smartphone 111 is a terminal device owned by the customer that communicates with the server S1 via the network N1 or communicates directly with the wireless communication unit 14 described later (e.g., via Bluetooth communication). The water heater remote control 10 may remotely operate the water filling operation and temperature adjustment, etc., based on the operation of the smartphone 111. The water heater system 1000 may also have a tablet device (not shown) or other electronic device instead of the smartphone 111.

[0020] Server S1 manages data related to the water heater 100, and also has the function of communicating with smartphone 111 via network N1, and communicating with wireless communication unit 14 sequentially via network N1 and wireless router 110.

[0021] <Configuration of the water heater remote control> The water heater system 1000 can use, for example, the water heater remote control 10A of the first embodiment to the water heater remote control 10E of the fourth embodiment, as shown in Figures 2A to 2C, as the water heater remote control 10. The configurations of the water heater remote control 10A of the first embodiment to the water heater remote control 10E of the fourth embodiment will be described below with reference to Figures 2A to 2C.

[0022] (First embodiment) Figures 2A and 2C show the front view, rear view, and side view of the water heater remote control 10A of the first embodiment, respectively.

[0023] As shown in Figures 2A and 2B, the water heater remote control 10A of the first embodiment includes a remote control circuit board 11, a display unit 13, a wireless communication control unit 15, a wireless radio wave source 16, and a shielding member 20.

[0024] The remote control board 11 is a circuit board on which an intercom circuit 12, a display unit 13, a wireless communication control unit 15, a wireless radio wave source 16, and other components are mounted. The intercom circuit 12 is a circuit that performs voice communication and includes a microphone and speaker (not shown). In this embodiment, the remote control board 11 has a rectangular shape and has a display unit 13 in the upper left corner. The display unit 13 is the part that displays information related to the water heater 100. In this embodiment, the explanation will be given assuming that the display unit 13 is a liquid crystal display.

[0025] The wireless communication unit 14 includes a wireless communication control unit 15 and a radio wave source 16. The wireless communication control unit 15 is a component that controls wireless communication. The radio wave source 16 is a component that outputs radio waves. The radio wave source 16 has an antenna 17 that inputs and outputs radio waves. In this embodiment, the radio wave source 16 is mounted on the remote control board 11.

[0026] The shielding member 20 is a member that blocks radio waves coming from the inside and outside. Examples of radio wave blocking members include aluminum, copper, silver, iron, stainless steel, beryllium steel, permalloy with high magnetic permeability, rubber-based resin members that mix conductive materials such as silicon-based or glass particles with silver plating, and shielding paints that mix magnetic materials or dielectric materials. The shielding member 20 may also be a shielding cover (metal shield) that shields a part of the electronic components with the same member. In this embodiment, the explanation assumes that the shielding member 20 is composed of a copper foil pattern 21, which is a type of metal foil pattern. A metal foil pattern is a member formed planarly to block radio waves coming from the inside and outside, and for example, it may be formed as a solid coating (i.e., completely covered without gaps) or a mesh (pattern laid in a grid) to block radio waves. In this embodiment, it is assumed that the remote control board 11 is configured as a double-sided board, but the remote control board 11 may be configured as a multilayer board having a copper foil pattern 21 as the shielding member 20 in the inner layer. The shielding member 20 may be composed of a three-dimensionally formed metal shield that blocks radio waves coming from both the inside and the outside.

[0027] As shown in Figures 2A and 2B, in this embodiment, the wireless communication control unit 15 and the radio wave source 16 are located on the front side of the remote control board 11, and the intercom circuit 12 is located on the rear side of the remote control board 11. The copper foil pattern 21 is arranged to block radio waves coming from the inside (output from the radio wave source) and the outside (see the three lines shown in Figure 2C) around or on the rear side of the area on the remote control board 11 where the wireless communication control unit 15 and the radio wave source 16 are located. In this embodiment, the copper foil pattern 21 (shielding member 20) is laid to surround the wireless communication control unit 15 and the radio wave source 16 located on the front side of the remote control board 11 on the same plane. The copper foil pattern 21 (shielding member 20) is formed on the rear side of the remote control board 11 so as to cover the area on the front side where the wireless communication control unit 15 and the radio wave source 16 are located.

[0028] As shown in Figure 2C, an opening 90op is formed in the wall 90 of the kitchen, etc. The opening 90op is a hole through which a remote control cord (not shown), which is a power line for connecting the water heater remote control 10A to the power supply (not shown), is inserted from the wall 90, and a hole of a similar size is also provided in the remote control mounting plate 91. The remote control mounting plate 91 is a member that supports the water heater remote control 10A and is fixed to the wall 90 with a number of screws (not shown). The remote control mounting plate 91 has a remote control locking part 92. The remote control locking part 92 is a component that supports the back of the water heater remote control 10A. The remote control locking part 92 is configured to protrude from the remote control mounting plate 91 toward the front side and supports the water heater remote control 10A from the rear side. The remote control mounting plate 91 can determine the mounting location of the water heater remote control 10A.

[0029] (Second example) Figures 3A (Figure 4A) to 3C (Figure 4C) are the front view, rear view, and side view, respectively, of the water heater remote control 10B (10C) of the second embodiment. As shown in Figures 3A (Figure 4A) to 3C (Figure 4C), the water heater remote control 10B (10C) of the second embodiment differs from the water heater remote control 10A of the first embodiment (Figures 2A to 2C) in the following respects. (Difference B) The water heater remote control 10B (10C) of the second embodiment has the wireless communication unit 14 arranged on a separate circuit board. The water heater remote control 10C has an opening 11op in the remote control circuit board 11, and a wireless communication circuit board 14a on which a wireless communication control unit 15 and a wireless radio wave source 16 are mounted as a separate circuit board inside the opening 11op. The wireless communication circuit board 14a is positioned so as to be substantially flush with the surface of the remote control circuit board 11.

[0030] The differences between Figures 3A to 3C and Figures 4A to 4C are as follows. The remote control 10C has a wireless communication board 14a, on which the wireless communication control unit 15 and the wireless radio wave source 16 are mounted on the front side, positioned so that its surface is in front of the surface of the remote control board 11. In contrast to the configuration in which the wireless communication board 14a (Figures 4A to 4C) is placed inside the opening 11op of the remote control board 11, the wireless communication board 14a (Figures 5A to 5C) is placed without providing an opening 11op in the remote control board 11.

[0031] (Third embodiment) Figure 5A is a front view of the water heater remote control 10D of the third embodiment. Figure 5B is a rear view of the wireless communication board 14b (separate board) of the water heater remote control 10D of the third embodiment. Figure 5C is a side view of the water heater remote control 10D. As shown in Figures 5A to 5C, the water heater remote control 10D of the third embodiment differs from the water heater remote control 10A of the first embodiment (Figures 2A to 2C) in the following respects. (Difference D) The water heater remote control 10D of the third embodiment includes a wireless communication board 14b on which a wireless radio wave source 16 and an antenna 17 are mounted on the front side, and the wireless communication board 14b is positioned at a distance from the wireless communication control unit 15 and is connected to the wireless communication control unit 15 via a cable 18. In this embodiment, the wireless communication board 14b is assumed to be positioned on the upper right side of the front of the water heater remote control 10D. However, it may also be provided with multiple fixing parts (not shown) that can be used to position it in other locations. When a contractor installs the water heater remote control 10D at a customer's home, the wireless communication board 14b may be arbitrarily repositioned to a location with minimal radio wave interference, depending on the location of external devices such as an in-house door phone 120 (Figure 8) that are placed around it.

[0032] (Fourth embodiment) Figures 6A to 6C are the front view, rear view, and side view, respectively, of the water heater remote control 10E of the fourth embodiment. As shown in Figures 6A to 6C, the water heater remote control 10E of the fourth embodiment differs from the water heater remote control 10C of the second embodiment (Figures 4A to 4C) in the following respects. (Difference E) The water heater remote control 10E of the fourth embodiment is equipped with a radio wave absorbing sheet 26 on the back side of the intercom circuit 12, and is positioned behind the back of the remote control circuit board 11. The water heater remote control 10E has a wireless communication board 14a on which the wireless communication control unit 15 and the wireless radio wave source 16 are mounted, positioned behind the back of the remote control board 11. The radio wave absorbing sheet 26 is provided so as to cover the back of the intercom circuit 12, thereby suppressing interference from radio waves output from the wireless communication board 14a. In this embodiment, the intercom circuit 12, which is susceptible to radio wave interference, is assumed, but the radio wave absorbing sheet 26 may also be provided on other circuits on the remote control board 11 (display, button input, communication circuit, etc.).

[0033] The water heater remote control 10A of the first embodiment can solve the aforementioned problems of conventional water heater remote controls, as described below. The same applies to the water heater remote controls 10A, 10B, 10C, 10D, and 10E of the other embodiments.

[0034] (1) Conventional water heater remote controls need to be installed at a distance from external devices such as the in-house door phone 120 (Figure 8), but the water heater remote control 10A of the first embodiment can suppress interference from radio waves emitted from the in-house door phone 120. (2) Conventional water heater remote controls require consideration of the installation of a wireless adapter for wireless connection, such as the possibility of disconnection of the connection cord or communication abnormalities depending on the presence or absence of a switch box, the possibility of reduced radio wave strength due to the fixed position of the wireless adapter, and the impact of the placement of the water heater remote control. However, with the water heater remote control 10A of the first embodiment, the wireless communication unit 14 is installed inside the water heater remote control 10A, so there is no need to consider concerns regarding the installation of the wireless adapter.

[0035] The present invention is not limited to the embodiments described above, and includes various modifications. For example, the embodiments described above are described in detail for the purpose of clearly illustrating the present invention, and are not necessarily limited to those having all the configurations described. Furthermore, it is possible to replace some of the configurations of the embodiments with other configurations, and it is also possible to add other configurations to the configurations of the embodiments. In addition, it is possible to add, delete, or replace some of the configurations of each configuration with other configurations.

[0036] For example, the water heater system can be configured as shown in Figure 7. Figure 7 is a diagram of a modified water heater system 1000. In the modified water heater system 1000 shown in Figure 7, the water heater remote control 10 is installed in the kitchen and the bathroom. Hereinafter, the water heater remote control 10 installed on the kitchen wall will be referred to as the "kitchen remote control 101A," and the water heater remote control 10 installed in the bathroom will be referred to as the "bathroom remote control 101B."

[0037] The kitchen remote control 101A and the bathroom remote control 101B are composed of one of the water heater remote controls 10A of the first embodiment to the water heater remote controls 10E of the fourth embodiment, as shown in Figures 2A to 6C.

[0038] The kitchen remote control 101A includes an intercom circuit 12 and a wireless communication control unit 15. The intercom circuit 12 includes a control unit 51, a communication unit 52, a microphone 53, an amplification unit 54, an audio output unit 56, and a speaker 57. The intercom circuit 12 also includes an FM modulation / demodulation unit 58, a bandpass filter 59, and a variable resistor 70.

[0039] The control unit 51 is a component that controls the overall operation of the intercom circuit 12. The communication unit 52 is a component that communicates with the outside. The microphone 53 is an input means for audio signals. The amplification unit 54 is a component that amplifies the audio signal input from the microphone 53. The audio output unit 56 is a component that outputs the audio signal to the speaker 57. The speaker 57 is an output means for audio signals. The FM modulation / demodulation unit 58 is a component that modulates or demodulates the audio signal using FM. The bandpass filter 59 is a component that blocks signals of any frequency. The variable resistor 70 is a component that changes the resistance value of the amplification unit 54.

[0040] The bathroom remote control 101B has an intercom circuit 60. The intercom circuit 60 has the same components as the intercom circuit 12 of the kitchen remote control 101A, and includes a control unit 61, a communication unit 62, a microphone 63, an amplification unit 64, an audio output unit 66, and a speaker 67. The intercom circuit 60 also includes an FM modulation / demodulation unit 68, a bandpass filter 69, and a variable resistor 70.

[0041] Furthermore, the intercom circuit 12 of the kitchen remote control 101A has a receiver / transmitter switching unit 55 that switches between receiving and transmitting. Furthermore, the intercom circuit 60 of the bathroom remote control 101B includes a voice detection unit 65a that detects sound, and a switch 65b that outputs the sound signal to the voice output unit 66 when the voice detection unit 65a detects a sound signal.

[0042] Furthermore, the control unit 51 of the intercom circuit 12 of the kitchen remote control 101A, via the wireless communication control unit 15, performs predetermined communication between a terminal device such as a smartphone 111 (Figure 1) and the server S1 via the network N1.

[0043] The water heater system 1000 also includes a kitchen remote control 101A, a bathroom remote control 101B, and a main circuit board 80. The main circuit board 80 is a circuit board on which circuits for controlling a heat pump unit (not shown) that produces hot water and a hot water storage tank unit (not shown) that mixes hot water and cold water and adjusts it to a suitable temperature are mounted. The main circuit board 80 is connected to the kitchen remote control 101A via cable K1 and is also connected to the bathroom remote control 101B. The kitchen remote control 101A and the bathroom remote control 101B are also interconnected. The main circuit board 80 includes a control unit 81 and a communication unit 82. The control unit 81 executes a predetermined program and controls the hot water storage tank unit based on signals received from the kitchen remote control 101A and the bathroom remote control 101B via the communication unit 82.

[0044] In the modified water heater system 1000, the kitchen remote control 101A and the bathroom remote control 101B are composed of one of the water heater remote controls 10A of the first embodiment to the water heater remote control 10E of the fourth embodiment, as shown in Figures 2A to 6C. Therefore, in the modified water heater system 1000, the shielding member 20 (Figures 2A to 2C) can suppress interference between the intercom circuit 12 from radio waves from internal wireless communication and radio waves from external devices. In addition, the modified kitchen remote control 101A and bathroom remote control 101B are equipped with microphone signal amplifiers 54 and 64 and a variable resistor 70, and increasing the resistance value of the variable resistor 70 amplifies the microphone signals 53 and 63. As a result, the signal source becomes larger relative to the noise generated, improving the S / N ratio and suppressing the generation of noise. Therefore, this modified version makes it possible to suppress noise even more than in embodiments 1 to 4. [Explanation of Symbols]

[0045] 10, 10A, 10B, 10C, 10D, 10E, 10Old Water heater remote control (communication device for water heaters) 11 Remote control circuit board 11op opening 12 Intercom Circuit 13 Display section 14. Wireless Communication Section 14a, 14b Wireless communication board 15 Wireless Communication Control Unit 16 Radio wave source 17 Antenna 18 Cables 20 Shielding member 21 Copper foil pattern (metal foil pattern) 26 Radio wave absorbing sheet 51, 61, 81 Control Unit 52, 62, 82 Communications Department 53,63 Mike 54,64 Amplifier section 55. Receive / Transmit Switching Unit 56,66 Audio output section 57,67 speakers 58,68 FM Modulation / Demodulation Section 59,69 Bandpass Filter 60 Intercom Circuit 65a Voice detection unit 65b switch 70 Variable resistor 80 Main board 90 Wall 90op opening 91 Remote control mounting plate 92 Remote control locking part 100 water heaters 101A Kitchen Remote Control 101B Bathroom Remote Control 110 Wireless router (information gathering device) 111 Smartphone 120 Indoor Doorbell (Intercom) 1000 Water Heater System N1 Network S1 Server

Claims

1. A remote control board with an intercom circuit implemented, A wireless communication control unit that controls wireless communication, A radio source having an antenna that emits radio waves, The wireless communication control unit and the wireless radio wave source are arranged on the front side of the remote control board. The intercom circuit is located on the back side of the remote control board. A water heater remote control characterized in that a shielding member for blocking radio waves is arranged around and on the back of the remote control circuit board, at least in the area where the wireless communication control unit and the wireless radio wave source are provided.

2. In the water heater remote control according to claim 1, The water heater remote control is characterized in that the shielding member is a metal foil pattern formed planarly around and behind the wireless communication control unit and the wireless radio wave source of the remote control circuit board, so as to block radio waves arriving from the inside and outside.

3. In the water heater remote control according to claim 1, The water heater remote control is characterized in that the shielding member is a three-dimensionally formed metal shield that blocks radio waves arriving from the inside and outside to the surroundings and back side of the wireless communication control unit and the wireless radio wave source of the remote control circuit board.

4. In the water heater remote control according to claim 1, The wireless communication control unit and the wireless radio wave source are mounted on a separate circuit board, The water heater remote control is characterized in that the separate circuit board is positioned such that its surface is substantially in the same plane as the surface of the remote control circuit board.

5. In the water heater remote control according to claim 1, The wireless communication control unit, the wireless radio wave source, and the shielding member are mounted on a separate circuit board, The water heater remote control is characterized in that the aforementioned separate circuit board is positioned so that its surface is in front of the surface of the remote control circuit board.

6. A remote control board with an intercom circuit implemented, A wireless communication control unit that controls wireless communication, A radio source having an antenna that emits radio waves, The wireless communication control unit and the wireless radio wave source are arranged on the front side of the remote control board. The intercom circuit is located on the back side of the remote control board. The antenna and the radio wave source are mounted on a separate circuit board, different from the remote control board, and are positioned at a distance from the wireless communication control unit. A water heater remote control characterized in that a shielding member for blocking radio waves is arranged around and on the back of at least the area on the separate circuit board where the antenna and the radio wave source are provided.

7. In the water heater remote control according to claim 6, The water heater remote control is characterized in that the shielding member is a metal foil pattern formed planarly around and behind the wireless communication control unit and the wireless radio wave source on the separate substrate, so as to block radio waves arriving from the inside and outside.

8. In the water heater remote control according to claim 6, The water heater remote control is characterized in that the shielding member is a three-dimensionally formed metal shield that blocks radio waves arriving from the inside and outside to the surroundings and back of the wireless communication control unit and the wireless radio wave source on the separate circuit board.

9. In the water heater remote control according to claim 1 or claim 6, The intercom circuit is equipped with a radio wave absorbing sheet on its rear side, The water heater remote control is characterized in that the wireless communication control unit and the wireless radio wave source are positioned behind the back of the remote control circuit board.

10. In the water heater remote control according to claim 1 or claim 6, The water heater remote control is characterized in that the intercom circuit comprises a microphone, an amplification unit for amplifying the signal from the microphone, and a variable resistor for adjusting the signal amplification of the amplification unit.

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