JP6416902B2 - Hot water storage tank unit, hot water storage type water heater, and installation method of alternative temperature sensor in hot water storage unit - Google Patents

Description

  The present invention relates to a hot water storage type water heater.

  The hot water storage type water heater disclosed in Patent Document 1 is “If the temperature thermistor arranged approximately evenly in the height direction of the hot water storage tank is defective and must be replaced, the hot water storage tank is located on the rear side of the housing. The thermistor was difficult to handle due to the fact that the thermistor was placed in the same position (paragraph 0006 of the same document), "In this way, when replacing the thermistor, a very complicated work process had to be performed. It should be noted that in the heat insulating material made of glass wool, styrene, etc., it was possible to cut out partly in the vicinity of the thermistor installation location, but the vacuum heat insulating material was formed by forming a vacuum layer inside it. The heat insulation power is maintained, and the vacuum heat insulating material itself cannot be cut (paragraph 0007 of the same document). "... hot water storage tank, a plurality of temperature thermistors arranged in the height direction of the hot water storage tank, a vacuum heat insulating material covering a side surface portion of the hot water storage tank, a ceiling heat insulating material and a bottom heat insulating material of the hot water storage tank A communication heat insulating material that is formed of a material different from the material that constitutes the vacuum heat insulating material and that has a take-out portion that covers the temperature thermistor. The configuration is adopted.

  In addition, as the details of the “extraction part”, “the extraction part 46 may enhance the heat retention effect as a structure in which one or more heat insulating materials of the same material as the communication heat insulating material 45 are packed, as shown in FIG. Alternatively, it may be configured to be openable and closable, and any configuration other than the above may be used as long as it covers the temperature thermistor 40 (paragraph 0028 of the same document). By using styrene, glass wool or the like instead of the heat insulating material, even if the temperature thermistor 40 and the extraction portion 46 come into contact with each other, the performance is not affected, and it is possible to prevent the heat insulating effect from being lowered due to the tearing of the vacuum heat insulating material. Document paragraph 0031) ".

  That is, in the hot water storage type hot water heater of Patent Document 1, the “outlet portion” is formed by packing the heat insulating material of the same material into the gap of the continuous heat insulating material such as styrene or glass wool or opening and closing it. The defective temperature thermistor (defective temperature sensor) can be exchanged from the “extraction section”.

  Further, in Patent Document 2, as shown in FIGS. 6 to 8 of the same document, a sheet metal opening 15c is provided in advance in the sheet metal member 14, and the cut-out heat insulating material 17c is taken out from the sheet metal opening 15c. After that, a hot water supply apparatus to which a replacement thermistor 25c used instead of the thermistor 20c is attached is disclosed.

Japanese Patent No. 4211786 JP 2012-97934 A

  In the hot water storage tank of the hot water storage type water heater disclosed in Patent Document 1, the “outlet portion” is formed by packing the heat insulating material of the same material into the gap of the continuous heat insulating material such as polystyrene or glass wool. That is, it is described in Patent Document 1 in the case where styrene, glass wool or the like is used for the heat insulating material, which can be performed separately from the mounting process of the communication heat insulating material to the hot water storage tank and the mounting process of the “extraction portion”. The “extraction part” can be formed by the method.

  However, as in Patent Document 1, in the “mounting portion” formed in advance, heat leaks from the periphery of the “mounting portion” instead of being integrated with the surrounding communication heat insulating material, so that the heat insulation performance of the hot water storage tank is improved. It is not preferable.

  Further, in the water heater of Patent Document 2, since a plurality of sheet metal openings 15c are provided, a foam heat insulating material is formed by injecting a liquid as a raw material of the heat insulating material after the tank body 11 is surrounded by the sheet metal member 14. Therefore, there is a problem that the heat insulation performance cannot be improved by using the foam heat insulating material that is in close contact with the tank main body 11 or the sheet metal member 14.

  The present invention provides a hot water storage type hot water heater in which a foam heat insulating material is formed by injecting a liquid as a heat insulating material around a hot water storage tank to improve the heat insulating performance of the hot water storage tank and to easily replace a defective temperature sensor. An object of the present invention is to provide a hot water storage type water heater that can achieve both heat insulation and maintainability.

To achieve the above object, in the hot water storage unit of the present invention, a hot water storage tank for storing hot water, a temperature sensor provided outside the hot water storage tank, a case surrounding the hot water storage tank, and an inlet provided in the case A hot water supply unit having a foam heat insulating material filled between the hot water storage tank and the case by being injected in a liquid state and foaming from the hot water storage tank in the vicinity of the temperature sensor and the The bonding strength of the foam heat insulating material was made weaker than the bonding strength of the hot water storage tank and the foam heat insulating material outside the vicinity of the temperature sensor.

Further, in the method of installing an alternative temperature sensor in the hot water storage unit of the present invention, a hot water storage tank for storing hot water, a temperature sensor provided outside the hot water storage tank, a case surrounding the hot water storage tank, and the case are provided. The hot water storage tank and the foam heat insulating material in the vicinity of the temperature sensor have a foam heat insulating material filled between the hot water storage tank and the case. A first step of cutting the case and the foamed heat insulating material larger than the temperature sensor, wherein the bonding force of the hot water storage tank and the foamed heat insulating material is not close to the temperature sensor. And a second step of removing the foam insulation, a third step of installing an alternative temperature sensor, and a fourth step of covering the alternative temperature sensor with the alternative foam insulation. A fifth step of fixing the alternate foam insulation in fixing tape had.

  ADVANTAGE OF THE INVENTION According to this invention, the hot water storage type water heater which was compatible with high heat insulation performance and apparatus maintenance property can be provided.

Perspective perspective view of hot water storage unit of Example 1 (before mounting of alternative temperature sensor) Perspective perspective view of the hot water storage unit of Example 1 (after mounting an alternative temperature sensor) Sectional view of the hot water storage unit of Example 1 (after mounting an alternative temperature sensor) Alternative temperature sensor mounting method to hot water storage unit of embodiment 1 How to use the extraction jig used in Example 1 Alternative temperature sensor mounting method to hot water storage unit of embodiment 2 Alternative temperature sensor mounting method to hot water storage unit of embodiment 3 Alternative temperature sensor mounting method to hot water storage unit of embodiment 4 Schematic of the hot water storage type water heater of Example 1

  Embodiments of the present invention will be described below with reference to the drawings.

  First, the outline of the hot water storage type water heater 70 of Example 1 is demonstrated using FIG. As shown here, the hot water storage type water heater 70 of the present embodiment is composed of a heat pump unit 140 that boils hot water, and a hot water storage tank unit 1 that stores boiled hot water and supplies hot water to a general hot water or a bathtub. Both units are controlled in accordance with an instruction given to the control device 155 from the remote controller 141 provided in the kitchen or bathroom.

  Inside the heat pump unit 140, a compressor 142, a water-refrigerant heat exchanger 143, an expansion valve 144, and an air-side heat exchanger 145 are housed, and these are connected by a refrigerant pipe to form a heat pump cycle. In addition, a hot water storage tank 2, a mixing valve 146, a three-way valve 147, an electromagnetic valve 149, a pressure reducing valve 150, a relief valve 151, a pump 152, and a heat exchanger 153 are accommodated in the tank unit 1. Temperature sensors 8 (8a to 8e) are provided on the surface of the hot water storage tank 2 substantially uniformly in the height direction, and details thereof will be described later.

  9 illustrates the internal structure of both units. However, as long as a heat insulating material such as hard polyurethane foam heat insulating material is used as the heat insulating material of the hot water storage tank 2, the hot water storage tank unit 1 and the heat pump unit 140 of other structures are used. May be used.

  Next, a schematic configuration of the hot water storage tank unit 1 according to the first embodiment will be described with reference to a perspective perspective view of FIG. Here, the mixing valve 146 and the three-way valve 147 shown in FIG. 9 are omitted.

  As shown in FIG. 1, a hot water storage tank unit 1 according to the present embodiment includes a hot water storage tank 2 for storing hot water, an interior body 6 and an exterior body 7 (upper surface exterior body 71, front exterior body) constituting a steel case surrounding the hot water storage tank 2. 72, a left exterior body 73, a right exterior body 74, a back exterior body 75, and a bottom exterior body 76). The interior body 6 can be exposed by removing the front exterior body 72. Further, in FIG. 1, the upper surface exterior body 71, the left surface exterior body 73, the right surface exterior body 74, the back surface exterior body 75, and the bottom surface exterior body 76 are illustrated as planar steel plates, but these are curved surfaces that protrude outwardly. A shaped steel plate may be used.

  The hot water storage tank 2 is configured by combining a stainless steel hemisphere with an upper portion and a lower portion of a stainless steel cylinder, and a part of the hot water storage tank 2 is covered with a vacuum heat insulating material 3 (first heat insulating material). Further, in the space between the hot water storage tank 2 and the interior body 6 or the exterior body 7, the liquid urethane injected from the inlet of the interior body 6 (not shown) is foamed, and the hard polyurethane foam heat insulating material 4 (second heat insulating material) is formed. The hot water storage tank 2 is insulated by a vacuum heat insulating material 3 (first heat insulating material) and a hard polyurethane foam heat insulating material 4 (second heat insulating material). In addition, although the hot water storage unit 1 provided with both the vacuum heat insulating material 3 (first heat insulating material) and the hard polyurethane foam heat insulating material 4 (second heat insulating material) is illustrated here, the vacuum heat insulating material 3 (first heat insulating material) is illustrated. ) May be omitted.

  On the other hand, the rigid polyurethane foam heat insulating material 4 (second heat insulating material) is not filled between the front exterior body 72 and the internal body 6, and a mixing valve 146, a control device 155, etc. (not shown) are arranged in this space. Has been.

  Further, the temperature sensors 8 (8a to 8e) are fixed to the positions of the heights 2a to 2e of the hot water storage tank 2 with a heat-resistant tape 82 such as an aluminum tape at substantially equal intervals. Here, the temperature sensor 8 is arranged vertically, but may be arranged horizontally. The output signals of these temperature sensors 8 (8a to 8e) are input to the control device 155 via signal lines 81 (81a to 81e) as shown in FIG. The temperature is detected. In the present embodiment, since the temperature sensor 8 is buried in the hard polyurethane foam heat insulating material 4 (second heat insulating material) and the outlet of the temperature sensor 8 is not provided, the temperature sensor 8 and other parts are also located in the vicinity. Similarly, high thermal insulation performance is ensured.

  Further, as shown in FIG. 1, the surface of the interior body 6 has a plurality of lattice-shaped grooves 61 at positions corresponding to the respective temperature sensors 8, and the interior body pieces are disposed inside each lattice-shaped groove 61. 62 is formed. Each interior body piece 62 is larger than the temperature sensor 8, and an installation space for one temperature sensor is secured corresponding to one interior body piece 62. In the example of FIG. 1, three interior body pieces 62 are provided at each height 2 a to 2 e, and three temperature sensor installation spaces are prepared for each height. In addition, although the example which shows a temperature sensor attachment position with the grid | lattice-like groove | channel 61 was demonstrated here, instead of this, a temperature sensor position is shown using a circular groove | channel, a concave shape, a convex shape, or a stamp. Also good.

  Next, an outline of a method for installing an alternative temperature sensor 9 to be used instead of the failed temperature sensor 8 will be described using the perspective perspective views of FIGS. 1 and 2 and the cross-sectional view of FIG.

  As shown in FIG. 1, when the front exterior body 72 is removed, a lattice-like groove 61 appears, from which the position of the temperature sensor 8 can be known. When the failed temperature sensor 8 can be identified, the operator removes the interior body piece 62 adjacent to the failed temperature sensor 8 and the hard polyurethane foam heat insulating material 4 (second heat insulating material) therebelow and removes the hot water storage tank 2. The surface is exposed, and an alternative temperature sensor 9 is attached thereto with heat-resistant tape 92. Then, after installing the hard polyurethane foam heat insulating material 41 (third heat insulating material) instead of the removed hard polyurethane foam heat insulating material 4 (second heat insulating material), the opening of the interior body 6 is closed with the fixing tape 5, The signal line 91 of the temperature sensor 9 is connected to the control device 155. In this way, by closing the opening of the interior body 6 with the fixing tape 5, the rigid polyurethane foam heat insulating material 41 (third heat insulating material) can be fixed, and water penetrates into the inside through the opening and hard polyurethane foam is formed. It can prevent erosion of the insulation.

  FIG. 3 which is a perspective perspective view of FIG. 2 and a cross-sectional view taken along the line AA of FIG. 2 is a diagram showing a state after the alternative temperature sensor 9 is attached by the above-described method. Here, an example in which the temperature sensors 9 are added next to all the temperature sensors 8 is shown, but an alternative temperature sensor 9 may be provided only for the failed temperature sensor 8.

  Next, the procedure for installing an alternative temperature sensor 9 next to the failed temperature sensor 8 will be described in detail with reference to FIG. First, the hard polyurethane foam heat insulating material 4 (second heat insulating material) below the groove 61 is cut (FIG. 4A). At this time, since the protective sheet 21 is attached to the surface of the hot water storage tank 2, it is possible to suppress the hot water storage tank 2 from being damaged when the hard polyurethane foam heat insulating material 4 (second heat insulating material) is cut. Next, both the trimmed interior body piece 62 and the hard polyurethane foam heat insulating material 4a are removed (FIG. 4B). At this time, if the bonding force between the hard polyurethane foam heat insulating material 4a and the protective sheet 21 is made weaker than the bonding force between the protective sheet 21 and the hot water storage tank 2, the operator can damage the hot water storage tank 2. The hard polyurethane foam heat insulating material 4a can be easily removed. Although not shown, the bonding force between the hard polyurethane foam heat insulating material 4a and the protective sheet 21 may be made stronger than the bonding force between the protective sheet and the hot water storage tank 2. In this case, when removing the hard polyurethane foam heat insulating material 4a, the protective sheet 21 can also be removed collectively, and the surface of the hot water storage tank 2 where the hard polyurethane foam heat insulating material does not remain can be exposed.

  Next, the alternative temperature sensor 9 is installed on the protective sheet 21 and fixed with heat-resistant tape 92 (FIG. 4C). Thereafter, a block-like hard polyurethane foam heat insulating material 41 (third heat insulating material) is inserted (FIG. 4 (d)). Finally, the opening of the interior body 6 is closed with the fixing tape 5, and the block-shaped hard polyurethane foam heat insulating material is filled. After 41 (third heat insulating material) is fixed (FIG. 4E), the signal line 91 of the temperature sensor 9 is connected to the control device 155 instead of the signal line 81 of the temperature sensor 8.

  In addition, in FIG.4 (d), although the example which attaches block-shaped hard polyurethane foam heat insulating material 41 (3rd heat insulating material) was shown, it replaces with this and it is made to foam by spraying liquid urethane, and hard polyurethane foam heat insulating material. 41 (third heat insulating material) may be formed. In this case, compared with the above-mentioned method, the space | gap around the temperature sensor 9 can be made smaller, and the heat insulation of the temperature sensor 9 vicinity can be made higher.

  By installing the alternative temperature sensor 9 by the method described above, the temperature of the hot water in the hot water storage tank 2 can be measured by the temperature sensor 9 instead of the failed temperature sensor 8, and the vicinity of the temperature sensor 9 is also an alternative. Since it is insulated by the hard polyurethane foam heat insulating material 41 (third heat insulating material), even after the temperature sensor 9 is added, the heat insulating performance equivalent to the original can be ensured.

  Next, with reference to FIG. 5, a method for cutting the rigid polyurethane foam heat insulating material 4 (second heat insulating material) shown in FIG. 4A will be described in detail. As shown to Fig.5 (a), in a present Example, it cuts into the interior body 6 and the hard polyurethane foam heat insulating material 4 (2nd heat insulating material) using the extraction jig | tool 40. As shown in FIG. As shown here, the extraction jig 40 has a blade having a shape matching the groove 61, that is, a blade having a shape suitable for cutting out the hard polyurethane foam heat insulating material 4a larger than the temperature sensor. By simply pressing 40 against the interior body 6, the interior body piece 62 divided by the lattice-like grooves 61 is cut out, and at the same time, the rigid polyurethane foam insulation material 4 (second insulation material) has substantially the same shape as the interior body piece 62. You can make incisions. In addition, although the interior body 6 having the grid-like grooves 61 is shown in FIG. 1 and the like, when a groove having a different shape is used, an extraction jig 40 that matches the shape may be used. For example, as shown in FIG. 5B, when the installation position of the alternative temperature sensor 9 is indicated by a circular groove, the shape of the blade of the take-out jig 40 may be circular. When the circular groove is used, the internal body piece 62 and the hard polyurethane foam heat insulating material 4 (second heat insulating material) can be cut out by rotating the take-out jig 40.

  According to the present embodiment described with reference to FIGS. 1 to 5, the high heat insulating property obtained by using the hard polyurethane foam heat insulating material 4 (second heat insulating material) and the high temperature capable of easily installing an alternative temperature sensor. A hot water storage type water heater having both maintainability can be obtained.

  In this embodiment, the temperature sensor has been described as an example. However, when replacing another sensor embedded in the hard polyurethane foam heat insulating material 4 (second heat insulating material), such as a pressure sensor or a capacitance sensor. A similar method may be used.

  In the present embodiment, the inner body piece 62 is divided by the groove 61, but the inner body piece 62 may be divided by a slit instead of the groove 61. By using the slit, compared with the case of using the groove 61, the distance that the steel plate must be cut can be shortened, and therefore the force required for the cutting operation can be further reduced. In addition, when using a slit, it cannot be overemphasized that it is necessary to block a slit so that the leakage from a slit may not occur at the time of injection of liquid urethane.

  Next, the hot water storage type water heater of Example 2 will be described with reference to FIG. The description of the same points as those of the hot water storage type water heater of Example 1 will be omitted.

  In the first embodiment, the mounting position of the alternative temperature sensor 9 is specified by the grid-shaped groove 61. However, in the present embodiment, the mounting position is not indicated by the grid-shaped groove 61, and the vicinity of the temperature sensor 8 (for example, An alternative temperature sensor 9 is attached at an arbitrary position within 30 cm in the vertical direction. In addition, since the alternative temperature sensor 9 cannot be attached by the method mentioned above to the location where the hot water storage tank 2 is covered with the vacuum heat insulating material 3 (first heat insulating material), the surface of the interior body 6 has an alternative temperature. It is desirable to attach a mark such as a character or a figure indicating a place where the sensor 9 may be attached. Needless to say, it is optimal to attach the temperature sensor 9 at the same height as the temperature sensor 8.

  As shown in FIG. 6, in this embodiment, the take-out jig 40 is pressed against the temperature sensor 8 in the vicinity of the lattice-shaped groove 61, and the interior body piece 62 and the rigid polyurethane foam heat insulating material 4 a having a desired size are attached. Cut out (FIG. 6A). Since the work after FIG.6 (b) is the same as that after FIG.4 (b), the overlapping description is abbreviate | omitted. If the surface of the hot water storage tank 2 is mirror-finished or coated with a paint that weakens the binding force, such as fluorine, silicon, or wax, the hard polyurethane foam insulation 4a that has been cut out can be easily removed. . Moreover, in FIG. 6, although the protective sheet 21 like Example 1 is not provided on the surface of the hot water storage tank 2, if it is set as the structure which provides the protective sheet 21 similarly to FIG. 4, the hard polyurethane foam heat insulating material 4a cut off will be provided. Easy to take out.

  As described above, in this embodiment, since the alternative temperature sensor 9 can be attached at an arbitrary position where the work is easy to perform, the work efficiency of installing the alternative temperature sensor 9 can be further increased.

  Next, the hot water storage type water heater of Example 3 will be described with reference to FIG. The description of the same points as those of the hot water storage type water heater of Example 1 will be omitted.

  In the first embodiment, the alternative temperature sensor 9 is provided next to the temperature sensor 8, but in this embodiment, the temperature sensor 8 is removed and the alternative temperature sensor 9 is installed at the same position.

  As shown in FIG. 7, in this embodiment, the position of the temperature sensor 8 is indicated by a lattice-like groove 61, the take-out jig 40 is pressed here, and an interior body piece 62 and a rigid polyurethane having a desired size are pressed. The foam heat insulating material 4a is cut out (FIG. 7A). At this time, the signal line 81 of the temperature sensor 8 is also disconnected. Thereafter, the failed temperature sensor 8 together with the interior piece 62 and the hard polyurethane foam heat insulating material 4a is removed (FIG. 7B), an alternative temperature sensor 9 is attached at the same position, and fixed with heat-resistant tape 92 (FIG. 7 ( c)). Since the work after the replacement temperature sensor 9 is attached (FIGS. 7D and 7E) is the same as that shown in FIGS. 4D and 4E, the redundant description is omitted. Since the temperature sensor 8 and the protective sheet 21 are not directly bonded, as can be seen from FIG. 7 (b), the resistance when removing the temperature sensor 8 together with the hard polyurethane foam heat insulating material 4a is small, and the operator can These can be easily taken out without damaging 2.

  In the present embodiment described above, since the alternative temperature sensor 9 is attached at the same position as the temperature sensor 8, the portion other than the place where the temperature sensor 8 was originally installed is not cut off. That is, the vacuum heat insulating material 3 (first heat insulating material) installed avoiding the installation location of the temperature sensor 8 is not damaged when the alternative temperature sensor 9 is installed.

  Next, the hot water storage type water heater of Example 4 will be described with reference to FIG. The description of the same points as those of the hot water storage type water heater of the third embodiment will be omitted.

  In the third embodiment, the position of the temperature sensor 8 is indicated by a grid-like groove, but in this embodiment, the position of the temperature sensor 8 is indicated by other marks (characters, marks, etc.).

  As shown in FIG. 8, in this embodiment, the lattice-shaped grooves 61 are not provided, but the position of the temperature sensor 8 is indicated by other marks, and the take-out jig 40 is pressed to a desired position. The large-sized interior body piece 62 and the hard polyurethane foam heat insulating material 4a are cut out (FIG. 8A). At this time, the signal line 81 of the temperature sensor 8 is also disconnected. Thereafter, the failed temperature sensor 8 together with the interior piece 62 and the hard polyurethane foam heat insulating material 4a is removed (FIG. 8B), an alternative temperature sensor 9 is attached at the same position, and fixed with heat-resistant tape 92 (FIG. 8 ( c)). Since the work after attaching the alternative temperature sensor 9 is the same as that shown in FIGS. 7D and 7E, the duplicated explanation is omitted.

  In the present embodiment described above, in addition to the effects obtained by the configuration of the third embodiment, since the groove 61 can be omitted, it is possible to obtain an effect that the design of the interior body 6 can be further improved.

70: Hot water storage type water heater, 1: Hot water storage tank unit, 140: Heat pump unit, 141: Remote control, 155: Control device, 2: Hot water storage tank, 6: Interior body, 61: Groove, 62: Interior body piece, 7: Exterior Body, 3: vacuum heat insulating material (first heat insulating material), 4: hard polyurethane foam heat insulating material (second heat insulating material), 41: hard polyurethane foam heat insulating material (third heat insulating material), 5: fixing tape, 8, 9 : Temperature sensor, 81, 92: Signal line, 82, 92: Heat-resistant tape, 40: Extraction jig

Claims (9)

A hot water storage tank for storing hot water,
A temperature sensor provided outside the hot water storage tank;
A case surrounding the hot water storage tank;
By injecting and foaming in a liquid state from an inlet provided in the case, a foam heat insulating material filled between the hot water storage tank and the case,
A hot water supply unit having
Coupling force between the hot water storage tank and the foam heat insulating material in the vicinity of the temperature sensor,
A hot water storage unit characterized in that it is weaker than the bonding force between the hot water storage tank and the foamed heat insulating material outside the vicinity of the temperature sensor. The hot water storage unit according to claim 1,
In the vicinity of the temperature sensor, a protective sheet is provided between the hot water storage tank and the foam insulation,
The bond strength between the protective sheet and the foam insulation is
A hot water storage unit characterized by being weaker than the bonding force between the hot water storage tank and the foamed heat insulating material. The hot water storage unit according to claim 1,
In the vicinity of the temperature sensor, a protective sheet is provided between the hot water storage tank and the foam insulation,
The bond strength between the protective sheet and the foam insulation is
A hot water storage unit, wherein the hot water storage unit is stronger than a bonding force between the hot water storage tank and the foamed heat insulating material. The hot water storage unit according to claim 1,
In the vicinity of the temperature sensor, the surface of the hot water storage unit is mirror-finished or is coated with fluorine, silicon, or wax. In the hot water storage unit according to any one of claims 1 to 4,
The hot water storage unit, wherein the case is provided with a character or a mark indicating a temperature sensor position. In the hot water storage unit according to any one of claims 1 to 5,
A hot water storage unit, wherein at least a part of the hot water storage tank is covered with a vacuum heat insulating material, and the vicinity of the temperature sensor is not covered with the vacuum heat insulating material. A hot water storage unit according to any one of claims 1 to 6,
A heat pump unit;
A hot water storage-type water heater characterized by comprising: A hot water storage tank for storing hot water, a temperature sensor provided on the outside of the hot water storage tank, a case surrounding the hot water storage tank, and injecting and foaming in a liquid state from an inlet provided in the case, A hot water storage tank and a foam heat insulating material filled between the cases, and a bonding force between the hot water storage tank and the foam heat insulating material in the vicinity of the temperature sensor is different from that in the vicinity of the temperature sensor and the hot water storage tank. It is a method of installing an alternative temperature sensor in a hot water storage unit that is weaker than the bond strength of foam insulation,
A first step of cutting the case and the foam insulation larger than the temperature sensor;
A second step of removing the cut case and foam insulation;
A third step of installing an alternative temperature sensor;
A fourth step of covering the alternative temperature sensor with an alternative foam insulation;
A fifth step of fixing the alternative foam insulation with a fixing tape;
An alternative temperature sensor installation method for a hot water storage unit. In the installation method of the alternative temperature sensor to the hot water storage unit according to claim 8,
In the first step, the signal line of the temperature sensor is cut together with the case and the foam insulation,
In the second step, the temperature sensor is removed together with the cut case and foam insulation,
In the third step, the alternative temperature sensor is installed in the hot water storage unit, wherein the alternative temperature sensor is installed at a position where the removed temperature sensor was present.

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