JP2009024912A - Operating device for water heater - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent unintended switching of hot water supply and water supply, and to improve operability in an operating device for a water heater comprising a heat exchanger applying a burner as a heat source. <P>SOLUTION: Stopper mechanisms 16c, 18e are constituted to permit pressing operation of an operation knob 16 from a returning-way position to a going-way position at a water supply position, and to prevent the operation knob 16 from rotated from the water supply position within a temperature adjustment angle range in a state of existing in the going-way position. A state that a gas valve 70 is closed, is kept, and a water stop valve 50 is opened when the operation knob 16 is pressed and operated, and the operation knob 16 exists in the going-way position in the water supply position, and the water stop valve 50 is closed when the operation knob 16 is pressed and operated, and exists in the returning-way position at the water supply position. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an operating device for a water heater provided with a heat exchanger using a burner as a heat source.

  Conventionally, as an operation device for a water heater equipped with a heat exchanger that uses a burner as a heat source, an operation knob that can be pushed and rotated from a backward movement position to a forward movement position, and a first push operation of the operation knob. And a push-push mechanism that is locked at the forward movement position and returns to the backward movement position after the second pushing operation, and the operation knob is located at the rotation position within a predetermined temperature control angle range and is the first time. The water stop valve provided in the water passage passing through the heat exchanger is opened when the forward movement position is present by pushing the gas, and the gas valve provided in the gas supply passage for supplying the fuel gas to the burner is opened. The temperature of the hot water is adjusted by changing the amount of water passing through the heat exchanger or the amount of combustion of the burner by turning the operation knob at the forward movement position within the temperature adjustment angle range. What has been made known is known.

  In addition, there is also known one that sets a rotation position out of the temperature adjustment angle range of the operation knob as a water discharge position where water is discharged without being heated by a heat exchanger. In this case, when the hot water temperature is adjusted within the temperature adjustment angle range, the operation knob may be accidentally turned too much to switch to the water discharge position unintentionally. In order to prevent this, a stopper mechanism is provided to prevent the operation knob from being turned to the water discharge position when it is in the forward movement position, and the operation knob is discharged from the temperature adjustment angle range only when it is in the reverse movement position. It can be rotated to a position (see, for example, Patent Document 1).

  In the thing of patent document 1, if an operation knob is rotated to a water discharge position, the interlock mechanism which opens a water stop valve will operate | move in response to rotation to a water discharge position, a water stop valve will be opened and water will be discharged. The Then, the water stop valve is closed and stopped by the interlocking mechanism by rotating the operation knob to the temperature adjustment range.

  Also, if the user pushes the control knob when the control knob is at the water discharge position, the control knob moves to the forward movement position, the gas valve is opened, the burner is burned, and the intention is made from the water discharge to the hot water. It will switch without. Therefore, in Patent Document 1, the stopper mechanism is configured so that the movement of the operation knob at the water discharge position is prevented from moving to the forward movement position, and the gas control valve is opened by accidentally pressing the operation knob at the time of water discharge. Is prevented.

However, in the configuration as described above, when the hot water is discharged, the operation knob at the forward movement position is returned to the backward movement position by pressing again, whereas the operation knob is adjusted from the discharge position at the time of water discharge. The water will be stopped by rotating the temperature angle range. Accordingly, there is a problem in that the water stop operation differs between the time of water discharge and the time of water discharge, and the user is likely to make a mistake in the water stop operation and the operability is poor.
No. 7-3240

  In view of the above, an object of the present invention is to provide an operation device for a water heater that prevents unintentional switching between hot water and discharged water and has improved operability.

  In order to achieve the above object, the present invention provides an operation device for a water heater including a heat exchanger having a burner as a heat source, wherein the operation device can be pushed from a backward movement position to a forward movement position and can be rotated. And a push-push mechanism that locks the knob in the forward movement position after the first push operation, and returns to the backward movement position after the second push operation, and the operation knob has a predetermined temperature adjustment angle range The water stop valve provided in the water passage that passes through the heat exchanger is opened and water is passed through the heat exchanger when it is in the rotational position and in the forward movement position by the first pushing operation, and the burner The gas valve provided in the gas supply passage to the valve is opened, the burner is burned and the hot water is discharged, and the operation knob located at the forward movement position is rotated within the temperature adjustment angle range so that the heat exchanger The hot water temperature is adjusted by changing the amount of water flow or the burner combustion amount, and adjusting the operation knob. Stopper mechanism that prevents the pivoting position deviating from the angular range from being set as a draining position where water is discharged without heating with a heat exchanger and the operation knob is in the forward movement position. And the operation knob that can be rotated from the temperature adjustment angle range to the water discharge position only when in the backward movement position is improved as follows.

  That is, in the operation device for the water heater of the present invention, the stopper mechanism allows the push operation from the backward movement position of the operation knob at the water discharge position to the forward movement position, and the operation knob is in the forward movement position. It is configured to prevent rotation from the water discharge position to the temperature adjustment angle range, and when the operation knob is in the forward movement position by pushing the operation knob at the water discharge position, the gas valve is kept closed. At the same time, the water stop valve is opened, and the operation knob is pushed and operated at the water discharge position, so that the water stop valve is closed when the operation knob is in the backward movement position.

  According to such a configuration, both the water stop operation at the time of pouring water and the time of water discharge are performed by returning from the forward movement position to the backward movement position by the pressing operation of the operation knob. Can be improved. When the operation knob is in the forward movement position, the stopper mechanism prevents the rotation from the temperature adjustment angle range to the water discharge position and the rotation from the water discharge position to the temperature adjustment angle range. Thereby, even if the operation knob is erroneously rotated at the forward movement position, it is possible to prevent unintentional switching between water discharge and hot water discharge.

  1 and 2, reference numeral 1 denotes a water heater body composed of a back plate 1a and a front cover 1b. The main body 1 includes a gas burner 2, a heat exchanger 3 using the burner 2 as a heat source, a water pipe joint 4 disposed at the lower end, a water system valve unit 5 connected to the water pipe joint 4, and a lower end. A gas pipe joint 6 and a gas valve unit 7 as a gas supply path connected to the gas pipe joint 6 are provided.

  On the downstream side of the water system valve unit 5, a heat exchange water channel 8 and a bypass water channel 9 as a water flow channel passing through the heat exchanger 3 are connected. The downstream end of the heat exchanger water channel 8 and the downstream end of the bypass water channel 9 are joined at a mixing unit 10 provided at the lower end center of the water heater body 1. A tapping head 11 is connected to the mixing unit 10 via a flexible tube 12.

  As schematically shown in FIG. 3, the gas system valve unit 7 includes a gas valve 70 including a solenoid valve, a water pressure responsive valve 71, a gas governor 72, and a gas amount adjusting valve 73 in order from the upstream side. Is provided.

  Further, as shown in FIG. 4, the water system valve unit 5 is provided with a water stop valve 50, a water governor 51, and a water amount adjustment valve 52 in order from the upstream side. The water stop valve 50 includes a diaphragm valve 50c that closes a valve hole 50b formed in a partition member 53 that defines the valve chamber 50a of the water stop valve 50 and the water governor 51 that are connected to the water pipe joint 4, and a diaphragm valve 50c. And a pilot valve 50e provided in the back pressure chamber 50d.

  The diaphragm valve 50c is formed with an orifice hole 50f that communicates the valve chamber 50a and the back pressure chamber 50d, and a pilot hole 50g that communicates the back pressure chamber 50d and the water governor 51. The pilot valve 50e is biased toward the diaphragm valve 50c by a spring 50h, and the pilot hole 50g is normally closed by the pilot valve 50e. When the pilot valve 50e is retracted against the spring 50h to open the pilot hole 50g, the pressure in the back pressure chamber 50d decreases, and the diaphragm valve 50c retracts due to the pressure difference with the valve chamber 50a. Then, the valve hole 50 b is opened and water is passed through the water governor 51.

  The water governor 51 includes a valve body 51d inserted in a valve seat member 51c that defines a primary pressure chamber 51a and a secondary pressure chamber 51b, and a diaphragm 51e connected to the valve body 51d on the secondary pressure chamber 51b side. Is provided. The back pressure chamber 51f defined by the diaphragm 51e communicates with a negative pressure outlet 55a of a venturi 55 provided in a connection portion 54 connected to the upstream end of the heat exchange water channel 8 through a communication hole 55b. When water is passed by opening the water stop valve 50, the negative pressure generated in the venturi 55 causes the diaphragm 51e to bend toward the back pressure chamber 51f, and the water pressure responsive valve 71 is opened via the rod 51g interlocking with the diaphragm 51e. The

  The water amount adjustment valve 52 includes a cylindrical valve body 52b that is rotatably attached to a cylindrical valve chamber 52a that communicates with the water governor 51 on the back side in FIG. As shown in FIG. 5, the valve body 52 b has a valve hole 52 c facing the connection portion 54 connected to the heat exchange water passage 8 and a valve hole 52 d facing the connection portion 56 connected to the upstream end of the bypass water passage 9. The water flow amount to the heat exchange water channel 8 and the bypass water channel 9 can be increased or decreased by the rotation of the valve body 52b.

  The gas amount adjusting valve 73 is operated via a pinion 15 that engages with the fan-shaped rack 14 at the upper end of the lever 13 shown in FIG. On the other hand, the water stop valve 50 and the water amount adjustment valve 52 are operated by the single operation knob 16, and the operation devices of the water stop valve 50 and the water amount adjustment valve 52 will be described in detail below.

  The water system valve unit 5 is disposed such that the shaft portion 52e of the valve body 52b of the water amount adjusting valve 52 faces forward and the operation rod 50i connected to the pilot valve 50e of the water stop valve 50 faces laterally outward. As shown in FIGS. 5 and 6, the operating device is attached to a U-shaped mounting bracket 17 fixed to the front surface of the water system valve unit 5.

  As shown in FIG. 7, the operating device includes an operation knob 16, a base board 18 screwed to the front end of the mounting bracket 17, and a rotating member held by the base board 18 so as to be rotatable about an axis in the front-rear direction. 19, a reciprocating member 20 that is reciprocally held in the front-rear direction on the base board 18, a slider 21 that is slidably engaged with the rotating member 19 in the front-rear direction, and a lever pivotally attached to the mounting bracket 17 22.

  The rotating member 19 includes a cylindrical portion 19a that is rotatably fitted in a circular hole 18a formed in the base board 18, claw portions 19b formed at a plurality of locations around the front end of the cylindrical portion 19a, and a rear portion of the cylindrical portion 19a. When the cylindrical portion 19a is fitted in the circular hole 18a, the claw portion 19b engages with the front edge of the circular hole 18a and the flange portion 19c is on the back surface of the base board 18. The rotating member 19 is prevented from coming off from the base board 18 by abutting. The rear portion of the rotating member 19 is formed in a bottomed square tube portion 19d, and the square tube is formed with a slider 21 formed in a square tube shape interposed between the rear end of the square tube portion 19d and a spring 21a. By inserting it into the part 19d, the slider 21 is prevented from rotating around the rotating member 19 and is slidably engaged in the front-rear direction.

  Further, between the rotating member 19 and the slider 21, a heart-shaped cam groove 230 formed on one side surface of the slider 21 and a slit 19 i having one end formed on one side surface of the rectangular tube portion 19 d of the rotating member 19. The engagement arm 231 is engaged with the cam groove 230 and the other end is inserted and supported in a groove portion 19j formed on the rear end surface of the rotating member 19, and one end of the engagement arm 231 is cam groove. A push-push mechanism 23 including a ring-shaped spring 232 that is urged inward so as to be pushed into 230 is provided. The ring-shaped spring 232 is mounted so as not to be displaced in the front-rear direction between the flange 233a on the outer periphery of the rear portion of the rectangular tube portion 19d and the claw portion 233b on the rear side.

  The reciprocating member 20 is formed in a cylindrical shape surrounding the rectangular tube portion 19d, and a pair of guide sleeves 20a, 20a extending forward is integrally formed at two places around the outer periphery thereof, and both sleeves 20a, 20a are formed. Is inserted into a pair of guide bars 18b, 18b extending rearward and integrally projecting from the back surface of the base board 18, and thus the reciprocating member 20 is prevented from rotating with respect to the base board 18 and can be reciprocated back and forth. To be able to support.

  Further, a flange portion 20b is formed at the front end of the reciprocating member 20, and a claw portion 21b that protrudes outward is formed in the slider 21 through a slit groove 19e formed in the rotating member 19 in the front-rear direction. Then, by engaging the claw portion 21b with the flange portion 20b, the slider 21 and the reciprocating member 20 can be connected in the front-rear direction while permitting relative rotation of the slider 21.

  When assembling the operating device, the slider 21 is inserted into the rotating member 19 and then the push-push mechanism 23 is assembled. Next, the claw portion 21b is engaged with the flange portion 20b so that the slider 21 and the reciprocating member 20 are connected. Link. In this connection, the reciprocating member 20 is extrapolated to the rotating member 19 so that the notch 20c of the flange portion 20b matches the claw portion 21b, and then the reciprocating member 20 is rotated to rotate the claw portion 21b. And the flange portion 20b is engaged.

  Next, the cylindrical portion 19a is fitted in the circular hole 18a, and the guide sleeve 20a is fitted on the guide bar 18b. According to this, the reciprocating member 20 is prevented from rotating with respect to the base board 18, and on the other hand, the stopper 19 f protruding from the rotating member 19 and the pair of receiving portions 18 c and 18 d protruding from the back surface of the base board 18. 8, the rotation range of the rotation member 19 is restricted as shown in FIG. 8, and the claw portion 21 b of the slider 21 that is prevented from rotating by the rotation member 19 is aligned with the notch 20 c of the flange portion 20 b of the reciprocating member 20. Until the slider 21 and the reciprocating member 20 are not disconnected.

  A pair of guide bars 19g, 19g projecting forward of the cylindrical portion 19a is projected on the rotating member 19, and a shaft portion 21c extending forward is projected on the slider 21. A central boss hole 16a and a pair of boss holes 16b and 16b on both sides thereof are formed on the inner surface, and both guide bars 19g and 19g are slidably inserted into the boss holes 16b and 16b. The shaft portion 21c is fitted inside, and thus the operation knob 16 is engaged with the rotary member 19 so that it can be relatively moved in the front-rear direction, and the slider 21 is moved backward by the pushing operation of the operation knob 16. I was moved forward.

  After assembling the operating device as described above, the base board 18 is screwed to the mounting bracket 17, and according to this, the rotating member 19 is disposed coaxially with the water amount adjusting valve 52. As shown in FIG. 5, a shaft portion 19 h having a modified cross section extending rearward is projected from the rear end of the rotating member 19, and a hole having a modified cross section formed in the shaft portion 52 e of the valve body 52 b of the water amount adjusting valve 52. The shaft portion 19h is fitted, and the rotating member 19 and the valve body 52b of the water amount adjustment valve 52 are directly connected.

  Further, a convex portion 20 d protruding from the rear end of the reciprocating member 20 contacts one end of the lever 22, and the water stop valve 50 is opened via the lever 22 by the backward movement of the reciprocating member 20. . The lever 22 is composed of an L-shaped lever having an intermediate portion pivotally supported on the mounting bracket 17 via a pivot 22a. The other end of the lever 22 is connected to a pilot valve 50e of the water stop valve 50 as shown in FIG. When the lever 22 is swung counterclockwise in FIG. 6 by the rearward movement of the reciprocating member 20, the pilot valve 50e is moved to the spring 50h. The water stop valve 50 is opened by pulling it against. The lever 22 is biased by the spring 22b in the closing direction of the water stop valve 50, that is, clockwise in FIG. In the figure, reference numeral 22c denotes a relief hole formed at one end of the lever 22 for the guide bar 18b and the guide sleeve 20a.

  Further, the base board 18 is provided with a first switch SW1 interlocked with the rotating member 19 and a second switch SW2 interlocked with the reciprocating member 20. The first switch SW1 functions as a power switch of the combustion control circuit. As shown in FIG. 8, the first switch SW1 is turned on when the switch lever SW1a is pushed up by the flange portion 19c of the rotating member 19, and the rotating member 19 is stopped. When 19f is rotated to one rotation end position where it abuts on the receiving portion 18c, the switch lever SW1a falls into the notch portion 19h of the flange portion 19c so that the first switch SW1 is turned off.

  The second switch SW2 functions as an ignition switch. As shown in FIG. 9, the second switch SW2 includes a switch lever SW2a that cooperates with a cam projection 20e formed on one guide sleeve 20a of the reciprocating member 20, and reciprocates. It turns on when the switch lever SW2a is pushed up by the cam projection 20e by the backward movement of the member 20.

  Further, as shown in FIG. 3, a third switch SW <b> 3 that interlocks with the water pressure responsive valve 71 is provided. The third switch SW3 functions as an opening switch of the gas valve 70, and cooperates with the outer end piece 71a of the water pressure responsive valve 71 that contacts the rod 51g of the water governor 51 to open the water pressure responsive valve 71. Turned on at the time of valve.

  When the second switch SW2 and the third switch SW3 are turned on while the first switch SW1 is turned on, the gas valve 70 is opened and the igniter 25 (see FIG. 1) attached to the gas burner 2 is activated. Then, the gas burner 2 is ignited. After ignition, the gas valve 70 is held open by a signal from the frame rod 24 attached to the gas burner 2 for a certain period, and then the gas valve 70 is held open by the output of the thermocouple 26 for flame detection. Note that a thermocouple 27 for detecting lack of oxygen attached to the heat exchanger 3 is connected to the thermocouple 26 with a reverse polarity. When there is no oxygen, the output of the thermocouple 26 is offset by the output of the thermocouple 27, The gas valve 70 is closed.

  In the state where the first switch SW1 is turned off, even if both the second and third switches SW2 and SW3 are turned on, the gas valve 70 is not opened and the igniter 25 is not operated. The turning position where the first switch SW1 is turned off is set as the water discharge position of the operation knob 16. Further, the rotation range in which the first switch SW1 is turned on is set as the temperature adjustment angle range of the operation dial 16.

  As shown in FIG. 10, the operation knob 16 is provided with a convex portion 16c protruding backward, and the base board 18 is provided with a convex portion 18e protruding forward. The convex portion 16c has a convex portion 18e at a position (a position between the temperature adjustment angle range and the water discharge position) where the operation knob 16 is rotated to switch between hot water and water discharge when the operation knob 16 is in the forward movement position. It abuts and prevents further rotation of the operation knob 16. Moreover, the convex part 16c does not contact | abut with the convex part 18e, when the operation knob 16 exists in a backward movement position, and accept | permits the rotation which switches a hot water and a water discharge.

  Further, the convex portion 16c and the convex portion 18e rotate when the operation knob 16 is in the water discharge position so as to allow the operation knob 16 to be pushed from the backward movement position to the forward movement position at the water discharge position. It is arranged so that the position is shifted in the direction.

  Next, the operation of the water heater will be described. When the operation knob 16 is pushed within a temperature control angle range other than the water discharge position, the reciprocating member 20 is moved backward via the slider 21, and the second switch SW2 is turned on by this forward movement and the lever 22 is moved. Then, the water stop valve 50 is opened and water is passed through the heat exchanger 3. As a result of this water flow, the water pressure responsive valve 71 is opened via the rod 51g of the water governor 51, the third switch SW3 is turned on, the gas valve 70 is opened, and the igniter 25 is activated to operate the gas burner. 2 is ignited and hot water is discharged. Thereafter, even if the pressing of the operation knob 16 is released, the operation knob 16 is locked at the forward movement position by the push-push mechanism 23 via the slider 21 and the reciprocating member 20, and the hot water is continuously discharged.

  When the operation knob 16 is rotated within the temperature adjustment angle range, the valve body 52b of the water amount adjustment valve 52 is rotated through the rotation member 19, the amount of water flow to the heat exchanger 3 is increased or decreased, and the temperature of the hot water is increased. Change. Thus, the tapping temperature can be adjusted by turning the operation knob 16 within the temperature adjustment angle range. At this time, even if it is intended to rotate the operation knob 16 to the water discharge position outside the temperature adjustment range, the protrusion 16c provided on the operation knob 16 and the protrusion 18e provided on the base board 18 come into contact with each other, and the water discharge position. Rotation to is prevented.

  When the water is discharged, the operation knob 16 is returned to the backward movement position and then rotated to the water discharge position. Then, the operation knob 16 is pressed and locked at the forward movement position. In this state, the water stop valve 50 is opened, but the first switch SW1 is turned off and the gas valve 70 remains closed. Therefore, water is discharged without being heated by the heat exchanger 3.

  At this time, even if the operation knob 16 is to be rotated within the temperature adjustment angle range, the convex portion 16c and the convex portion 18e come into contact with each other, and the rotation into the temperature adjustment angle range is prevented. That is, in the operating device of the embodiment, the convex portion 16c and the convex portion 18e constitute the stopper mechanism of the present invention.

  As a result, when the operation knob 16 is in the forward movement position, the stopper mechanism prevents the rotation from the temperature adjustment angle range to the water discharge position and the rotation from the water discharge position to the temperature adjustment angle range. Even if the operation knob 16 is erroneously rotated at the moving position, it is possible to prevent unintentional switching between the water and the hot water.

  In order to stop water discharge, the operation knob 16 may be pressed again to return to the return movement position. Thereby, the water stop valve 50 is closed via the lever 22, and the water flow to the heat exchanger 3 is blocked.

  In the above-described embodiment, the gas burner 2 is directly ignited by the igniter 25 when water is passed through the heat exchanger 3. However, the gas burner 2 is provided with a normal fire burner that is ignited even when the burner 2 is extinguished. Then, the gas burner 2 may be transferred and ignited from the normal fire burner. In this case, the second and third switches SW2 and SW3 are not necessary. When the water discharge position is set, a gas valve that is closed when the first switch SW1 is turned off is connected to a water pressure responsive valve in a passage portion connected to the main burner on the downstream side of the branch portion of the gas supply path to the normal fire burner. Insert in series.

  In the above embodiment, the gas amount adjusting valve 73 is operated by the lever 13, but an interlocking mechanism for operating the gas amount adjusting valve 73 in conjunction with the rotating member 19 is provided to provide a single operation knob 16. Thus, both the water amount adjusting valve 52 and the gas amount adjusting valve 73 may be operated via the rotating member 19.

  In the operation device according to the embodiment, the water stop valve 50 is opened and closed by the lever 22, but the water stop valve 50 may be opened and closed by using a motor instead of the lever 22. In this case, the motor is operated so that the water stop valve 50 is opened while the operation knob 16 is in the forward movement position, and the water stop valve 50 is closed while the operation knob 16 is in the backward movement position. A switch or the like for operating the motor may be provided.

  As is clear from the above description, according to the operation device for the water heater of the embodiment, both the water stop operation at the time of the hot water and the time of the water discharge are returned from the forward movement position to the backward movement position by the pressing operation of the operation knob 16. Therefore, the water stop operation is the same, and the operability can be improved.

The front view of an example of the water heater which comprises the operating device of this invention. The right view of FIG. The figure which showed typically the gas type | system | group valve unit of the water heater. The cutting front view of the water-system valve unit of a water heater. The side view of the water-system valve unit of the state which assembled a part of operating device. VI-VI sectional view taken on the line of FIG. The perspective view which decomposes | disassembles and shows embodiment of the operating device of this invention. The figure explaining ON / OFF operation | movement of a 1st switch. The figure explaining ON / OFF operation | movement of a 2nd switch. The perspective view which shows a part of operating device of embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Water heater body, 2 ... Gas burner, 3 ... Heat exchanger, 50 ... Water stop valve, 51 ... Water governor, 52 ... Water quantity control valve, 7 ... Gas system valve unit (gas supply path), 70 ... Gas valve 8 ... Heat exchange channel (water channel), 16 ... Operation knob, 16c ... Projection (stopper mechanism), 18 ... Base panel, 18e ... Projection (stopper mechanism), 23 ... Push-push mechanism.

Claims (1)

An operation device for a water heater equipped with a heat exchanger using a burner as a heat source. The operation knob can be pushed from the backward movement position to the forward movement position and can be rotated, and the first operation of the operation knob. And a push-push mechanism that is locked at the forward movement position and returns to the backward movement position after the second pushing operation, and the operation knob is located at the rotation position within a predetermined temperature control angle range and is the first time. The water stop valve provided in the water passage that passes through the heat exchanger is opened and water is passed through the heat exchanger when it is in the forward movement position by pushing the gas, and the gas valve provided in the gas supply passage to the burner is When the valve is opened and the burner is burned and the hot water is discharged, the amount of water flow to the heat exchanger or the burner combustion amount is changed by turning the operation knob located in the forward movement position within the temperature adjustment angle range. The hot water temperature is adjusted, and the rotating position outside the temperature control angle range of the operation knob It is set as a water discharge position where water flows out without being heated by the exchanger, and a stopper mechanism is provided to prevent the operation knob from being turned to the water discharge position in the forward movement position. In what enables the operation knob to rotate from the temperature adjustment angle range to the water discharge position,
The stopper mechanism allows the operation knob to be pushed from the backward movement position to the forward movement position at the water discharge position, and can be rotated from the water discharge position to the temperature adjustment angle range with the operation knob at the forward movement position. Configured to prevent
When the operation knob is pushed and operated at the water discharge position and the operation knob is in the forward movement position, the gas valve is kept closed and the water stop valve is opened, and the operation knob is operated by pressing the operation knob at the water discharge position. An operating device for a water heater, wherein the water stop valve is closed when the valve is in the reverse operation position.

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