JP2011214748A - Water heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water heater made compact by using hot water for reheating bathtub water and enhancing reliability of reheating operation by hot water.SOLUTION: The water heater includes: a heat exchange means (bath heat exchanger 56) exchanging heat between hot water (HW) and bathtub water (BW); a circulating pump (62) installed in a circulation passage (hot water circulation passage 5) for making the hot water flow in the heat exchange means and making the hot water flow in the circulation passage (hot water circulation passage 5); and a control part (control device 82) supplying water to the circulation passage and performing intermittent operation of the pump during the water supply, when electric current made to flow in a drive motor of the pump (62) is less than a reference value.

Description

The present invention relates to a hot water supply apparatus having a reheating function using hot water of bathtub water, for example, a hot water supply apparatus including a hot water circulation path and a circulation pump on the hot water supply path side.

  In addition to drinking hot water and bathtub hot water supply, the hot water supply device is used for reheating heating of bathtub water, hot water heating, and the like to achieve multi-functionality.

  With regard to this hot water supply device, a single heating path is formed by a hot water supply heat exchanger and a latent heat recovery heat exchanger, and the heat of the circulating water in the heating path is supplied to the bath circuit, so that the hot water supply heat exchanger and the latent heat recovery are provided. It is known that a use side heat exchanger that is not related to a heat exchanger is configured (Patent Document 1).

In warm water heating, a circulation pump is installed in a circulation circuit for circulating hot water. In this heating water circulation pump, during the heating operation, the motor drive current is detected by the pump current detection circuit, and when the current value exceeds the upper limit value, it is determined that the motor is overloaded or the motor is locked and the heating operation is performed. It is known that when it is stopped and less than the lower limit value, it is judged as an idling state and the heating operation is stopped (Patent Document 2).

JP 2006-057984 A JP 2006-329460 A

  By the way, in the bath circuit (Patent Document 1) that supplies the amount of heat using the circulating water in the heating path, the circulating water stays in the pipe line when the bath water is not added. In the heating circulation path, the operation is stopped if there is an abnormality in the circulation pump (Patent Document 2), but maintenance is required to shift the motor drive current to a normal value.

Therefore, an object of the present invention is to provide a hot water supply apparatus that uses hot water for bath water pursuit and that has a compact apparatus and improved reliability of the chasing operation.

  The hot water supply apparatus of the present invention that has solved the above problems is provided with heat exchange means for exchanging heat of hot water into bathtub water, and a circulation path for flowing the warm water to the heat exchange means, and flowing the warm water to the circulation path A circulation pump, and a controller that supplies water to the circulation path when the current flowing through the motor that drives the pump is less than a reference value, and intermittently operates the pump during the water supply.

Moreover, this hot water supply apparatus may be configured such that high-temperature water is periodically poured from the hot-water supply circuit into the circulation path, and the accumulated water in the circulation path is replaced with the high-temperature water.

  According to the present invention, the following effects can be obtained.

  (1) Since the bath water can be heated (reheated) with the heat of hot water, the heat exchange means can be miniaturized and the hot water supply apparatus can be made compact.

  (2) Air (air) that has entered the circulation path of hot water can be removed, and problems due to residual air can be prevented.

  (3) Residual water in the circuit can be removed and the circuit can be kept clean.

(4) The idle operation time of the circulation pump in the circulation path can be shortened, and the durability of the circulation pump can be improved.

It is a figure which shows an example of the hot-water supply apparatus which concerns on 1st Embodiment. It is a figure which shows the structural example of a control apparatus. It is a flowchart which shows the air bleeding operation | movement at the time of automatic driving | operation. It is a flowchart which shows a memorial operation. It is a flowchart of the air bleeding operation at the first time of the memorial operation. It is a flowchart of the air bleeding operation at the first time of the memorial operation. It is a flowchart of the air bleeding operation after the second memorial operation. It is a flowchart of air bleeding at the time of normal use. An example of the internal structure of the bath hot-water supply apparatus which concerns on 2nd Embodiment is shown, (A) is a figure which shows the internal structure seen from the front side, (B) is a figure which shows the internal structure seen from the side surface side. . It is a figure which shows the example of installation of the hot-water supply apparatus which concerns on 3rd Embodiment.

[First Embodiment]

  The first embodiment will be described with reference to FIG. FIG. 1 shows an example of a bath water heater.

  This bath hot water supply device 2 is an example of the hot water supply device of the present invention, and as shown in FIG. 1, a hot water supply function unit 3, a pouring function unit 4, a hot water supply circuit 5, and a bath water replenishment function unit. 6 and a drain recovery / discharge function unit 8.

  The hot water supply function unit 3 is a function unit that heat-exchanges the heat of the combustion exhaust 10 to the clean water W to discharge hot water HW. When the hot water tap is opened by a shower or the like in the hot water supply pipe 12, clean water W flows into the water supply pipe 16. The clean water W flowing into the water supply pipe 16 is detected by the incoming water temperature sensor 17 and the water supply flow rate by the flow rate sensor 20. These pieces of detection information are transmitted to the control device 82, and the plurality of burners 22 are ignited. The burner 22 burns the fuel gas G, and produces combustion exhaust 10 in the combustion chamber 24. The combustion exhaust 10 flows upstream from the combustion chamber 24 along with the supply air from the supply fan 14 with the burner 22 side upstream.

  The clean water W flows to the sensible heat exchanger 30 through the latent heat exchanger 28 and is exchanged with the heat of the combustion exhaust 10. The latent heat exchanger 28 is a means for exchanging the latent heat of the combustion exhaust 10 to the clean water W, and the sensible heat exchanger 30 is a means for exchanging the sensible heat of the combustion exhaust 10 to the clean water W. The hot water HW on the outlet side of the sensible heat exchanger 30 is detected by a tapping temperature sensor 18 on the outlet side of the sensible heat exchanger 30. When the detected temperature is higher than the target temperature, the bypass water control valve 32 in the bypass circuit installed between the water supply pipe 16 and the hot water supply pipe 12 is opened, and the clean water W and the hot water HW are mixed. And control the temperature of the hot water hot water HW to the target temperature. The temperature of the hot water HW is detected by a temperature sensor 36 in the hot water supply pipe 12. Hot spring water HW is provided for shower water or the like.

  The opening degree of the water control valve 34 is determined by the control device 82 with reference to the temperature detected by the temperature sensor 36. Thereby, the amount of clean water W required for the temperature detected by the temperature sensor 36 to reach the target temperature is supplied to the hot water supply pipe 12.

  In the burner 22, the burner 22 is switched by opening and closing the hot water supply solenoid valves 42, 44, 46 on the condition that the original gas solenoid valve 40 in the gas supply pipe 38 is open, and the gas proportional valve 48 is switched. The supply amount of the fuel gas G, that is, the combustion amount is controlled according to the opening degree.

  The hot water supply function unit 4 includes the hot water supply function of the hot water supply function unit 3 described above, and is a functional unit for pouring hot water HW obtained by heat exchange of the hot water supply function into the bathtub 50, and is added to the hot water supply pipe 12. This is realized through a pouring pipe line 54 connecting the culvert pipe line 52. When the pouring solenoid valve 64 in the pouring pipe line 54 is opened, the hot water HW flowing through the hot water feeding pipe 12 flows into the memorial pipe line 52 through the pouring pipe line 54, and enters the bathtub 50 through the chasing pipe line 52. It is poured. The pouring amount is detected by a pouring amount sensor 58. A check valve 60 is installed in the pouring pipe 54 to prevent the bathtub water BW from flowing into the water W side.

  The hot water supply circulation path 5 includes the hot water supply function of the hot water supply function unit 3 described above, and is branched downstream of the sensible heat exchanger 30 in the hot water supply pipe 12, and the circulation pump 62 (DC motor / non-self-priming) Type) and a bath heat exchanger 56 and a circuit that joins the water supply pipe line 16 that is upstream of the latent heat recovery heat exchanger 28. This hot water supply circulation path 5 is an example of a circulation path for circulating high-temperature water HHW that is a heat medium for heating the bath water BW.

  The circulation pump 62 is configured as a non-self-priming type using a direct current (DC) motor as a drive source. The hot water supply circuit 5 is a circuit for supplying the hot water HHW heated by the hot water supply function unit 3 to a bath heat exchanger 56 that heats the bath water BW described later. The temperature control of the high-temperature water HHW is performed by the feed water temperature sensor 26 in the feed water pipe 16 and the hot water temperature sensor 18 in the hot water feed pipe 12.

  The bathtub water tracking function unit 6 is a function unit that exchanges heat with the bath heat exchanger 56 through which the hot water HHW flows as described above. When the controller 82 is instructed to remedy the bath water BW, the bath pump 68 is driven. The bath water BW flows from the bathtub 50 to the memorial pipeline 52 by driving the bath pump 68 and circulates to the memorial heat exchanger 66. The flow of the bathtub water BW is detected by the water flow switch 70, and the temperature of the bathtub water BW is detected by the bath sensor 72. When the water flow switch 70 does not detect the bath water BW, it is determined that there is no remaining hot water, and the operation is shifted to the pouring operation.

  The detection information is transmitted to the control device 82, whereby the circulation pump 62 is driven and the hot water supply function unit 3 starts operating. Combustion control is started by detecting the temperatures of the feed water temperature sensor 26 in the feed water pipe 16 and the hot water temperature sensor 18 in the hot water supply pipe 12. The hot water HHW heated by the hot water supply function unit 3 passes through the hot water supply circuit 5 and is supplied to the bath heat exchanger 56. On the other hand, the bath water BW is circulated by the bath pump 68 and is heat-exchanged by the heat exchanger 66 for reheating, and the temperature of the bath water BW is a bath temperature sensor 72 in the retreat pipeline 52 on the bathtub 50 side. The detected information is taken into the control device 82, and abnormal heating or the like is determined. When the temperature detected by the bath temperature sensor 72 reaches the reheating target temperature, the circulation pump 62 of the hot water supply circuit 5 and the burner 22 of the hot water supply function unit 3 are stopped, and the bath pump 68 is stopped to complete the reheating.

  The drain recovery / discharge function unit 8 recovers the drain 74 generated in the latent heat recovery heat exchanger 28 for hot water supply or pouring by a drain receiver 76 installed on the lower side of the heat exchanger, and a neutralizer 78. It is a functional part that leads to the outside and discharges from the overflow 80 to the outside. In the latent heat recovery heat exchanger 28 that recovers the latent heat of the combustion exhaust 10, the heat exchange condenses the water vapor of the combustion exhaust 10 and generates a strongly acidic drain 74.

  Next, the control device 82 will be described with reference to FIG. FIG. 2 shows an example of the control device. The control device 82 is configured by a computer and includes a control unit 83. The control unit 83 includes a CPU (Central Processing Unit) 84, a storage unit 85 including a ROM (Read-Only Memory) 86, a RAM (Random-Access Memory) 88, a timer 90, and the like. The CPU 84 executes a control program stored in the ROM 86, and generates a control output by processing such as calculation using the detected temperature as control information. The RAM 88 forms a program execution area. The timer 90 is an example of a time measuring unit, and generates time information for time control.

  The controller 83 includes a hot water temperature sensor 18, a water flow switch 70, other sensors 91 (water temperature sensor 17 and the like), a pouring solenoid valve 64, a circulation pump 62, a bath pump 68, and other functional units 93 (bypass water). Control valve 32 etc.) are connected. The circulation pump 62 includes a motor current detection unit 63, and the detected motor current is applied to the control unit 83. Instead of the motor current detection unit 63, a drive pulse detection unit may be provided and the detection pulse may be taken into the control unit 83.

  A bathroom remote control device 94 and a kitchen remote control device 95 are connected to the control device 82 by wire or wirelessly. These remote control devices 94 and 95 are user operation devices, each including a control unit 96, an operation unit 98, another display unit 100, and a voice notification unit 101, and are installed in the user's living area. . The operation unit 98 includes a tracking switch 99.

  The control unit 96 receives an operation input from the operation unit 98 and notifies the control device 82 of control information based on the operation input. The operation unit 98 includes a keyboard, a touch sensor, and the like. The control unit 96 is configured by a computer and includes a CPU 102, a ROM 104, a RAM 106, and the like (not shown). The CPU 102 executes a control program stored in the ROM 104 and generates a control output. The RAM 106 constitutes a program execution area. The control unit 96 cooperates with the control device 82, outputs a control command to the control device 82, receives output information from the control device 82, and provides a presentation output indicating a control state or the like to the other display unit 100.

  The display unit 100 performs a visible display based on the presentation output provided from the control unit 96 based on the display control of the control unit 96. In this case, either one or both of the display unit 100 and the voice notification unit 101 constitute an alarm generation unit.

  Next, referring to FIG. 3 and FIG. 4 for the air bleeding operation during automatic operation. FIG. 3 shows an example of the processing procedure of the air bleeding operation during automatic operation, and FIG. 4 shows an example of the processing procedure of the chasing operation.

  In the air venting, when water is drained from the pipe of the hot water supply circulation path 5 (after completion of the trial run or freeze prevention operation) or air is separated by combustion, the air is accumulated in the pipe. This is done to prevent a decline in the circulation capacity of the plant. This air bleeding is automatically started after this operation with the operation (automatic, slimy) of the remote control device 94 without requiring an artificial operation.

  Therefore, in this processing procedure, as shown in FIG. 3, after the construction is completed, “first power-on operation” is executed. When the automatic switch of the operation unit 98 of the remote controller 94 is pressed, the bypass water control valve 32 is “fully closed” (steps S11 and S12).

  (1) Pouring operation and bleeding operation

  When the pouring solenoid valve 64 is “open” (step S13), the pouring amount sensor 58 is turned on (step S14), and the clean water is poured into the bathtub 50 through the retrace outlet and the return port. At the same time, the circulation pump 62 rotates and the hot water supply circulation path 5 is filled with the clean water W. At this time, in order to surely vent the air, the operation of the circulation pump 62 is intermittently performed, for example, ON / OFF is repeated five times (step S15). In this case, the ON time of the circulation pump 62 is a fixed time, for example, 7 seconds, and the OFF time is a fixed time, for example, 5 seconds. The intermittent operation may be performed for a certain time, for example, 1 minute. For example, when 10 [liter] of pouring is completed as a predetermined amount of pouring (step S16), the pouring electromagnetic valve 64 is closed to complete air bleeding (step S17). That is, the air accumulated in the hot water supply circuit 5 is discharged to the bathtub 50 through the hot water supply line 12, the pouring line 54, and the memorial line 52. At this time, combustion is not performed for energy saving.

  In addition, in this processing procedure, the pouring solenoid valve 64 is closed (step S19), whether the flow rate sensor 20 is OFF (step S20), and whether the flow rate sensor 20 is turned OFF continuously is, for example, 2 times or less. (Step S21), an alarm is generated when it is not twice or less (step S22), and if the flow sensor 20 is OFF twice or less continuously, the pouring solenoid valve 64 is opened (step S23). Execute. The alarm is generated by the voice notification unit 101.

  Further, after the bath pump 68 is turned on, after determining whether or not the water flow switch (SW) 70 is turned off (step S18), the bath pump is turned off (step S24), and the hot water solenoid valve 64 is "opened" again. (Step S25), [hot water supply operation] is performed (step S26), and hot water is poured up to a set amount (step S27). If the set amount has been reached (YES in step S27), the pouring solenoid valve 64 is closed (step S28), and the chasing operation (FIG. 4) (step S29) is performed to determine whether the set temperature is exceeded ( Step S30), automatic completion notification (step S31), and automatic lamp display (step S32) are executed.

  (2) Remembrance operation (during automatic operation)

  In this chasing operation, it is confirmed that the air is completely vented from the hot water supply circulation path 5 (steps S41 to S51). First, the bath pump 68 and the circulation pump 62 are driven, and the current value flowing through the circulation pump 62 is measured. This current value is compared with a threshold value for air bleeding determination, and when the current value is equal to or less than the threshold value, circulation pump priming is performed. If it is equal to or greater than the threshold, it is determined that air is not mixed, and the air supply fan 14, igniter, source gas solenoid valve 40, hot water supply solenoid valve 42, 44, 46, and gas proportional valve 48 are turned on. Combustion is performed (steps S52 to S55). Moreover, while the bath combustion display time is turned on, the igniter is turned off after a certain time, for example, 3 [seconds] (step S56, step S57). Thereafter, proportional control is performed (step S58). The threshold value of the current value may be determined, for example, as 130 [mA] as an average value by taking a sample of the current value during normal operation of the circulation pump 62.

  The difference between the “second and subsequent power-on” operation and the “first-time power-on operation” is that the “power-on first operation” (1) The hot water pouring operation was performed while the power was turned off. From the second time onward, only the hot water pouring operation (hot water supply operation) is performed without operating the circulation pump 62 in step S15.

  In this memorial operation, after the bath pump is turned on, the rotation judgment of the circulation pump 62 (step S41). If there is rotation (NO in step S41), after a predetermined time, for example, 20 [seconds], the voice notification unit 101 (Step S42), and if there is a current after the circulation pump current determination (step S43) (NO in step S43), an alarm is generated after a predetermined time, for example, 20 seconds (step S43). S44). After the circulation pump is turned on (step S45), the rotation of the circulation pump 62 is determined (step S46). If there is no rotation (NO in step S46), an alarm is generated after a predetermined time, for example, 20 seconds (step S46). S47).

  If the circulating pump 62 rotates and the motor current of the circulating pump 62 is not a predetermined value, for example, 130 [mA] or more (NO in step S48), the priming water is supplied to the circulating pump 62 after a predetermined time, for example, 20 [seconds]. Supply (step S49), determination of whether the supply frequency is less than 2 (step S50), if it is 2 times or more, alarm generation processing is executed (step S51).

  Next, FIG. 5 and FIG. 6 are referred to regarding the air bleeding operation at the first time of the memorial operation. 5 and 6 show an example of the processing procedure of the air bleeding operation at the first time of the memorial operation.

  This processing procedure is a “first time when power is turned on”, and is a procedure in the case where the bath is filled with water in advance.

  When the tracking switch 99 of the operation unit 98 of the remote control device 94 is pushed, the bath pump 68 is driven (step S62) as the tracking lamp is turned on (step S61). The bath water BW flows from the bathtub 50 to the memorial pipeline 52 by driving the bath pump 68, and returns to the bathtub 50 through the bath heat exchanger 56. In this case, as the operations described above, rotation monitoring of the circulation pump 62 (step S63), alarm generation in the case of abnormality (step S64), motor current monitoring of the circulation pump 62 (step S65), alarm generation in the case of abnormality (Step S66) is performed.

  (3) Air bleeding check operation

  The circulation pump 62 is rotated (step S67), and it is checked whether or not past air venting (air purge) has been performed (step S70). Air bleeding is the operation exemplified in step S15 in FIG. If the air is not removed, the current value for determining whether or not the current value of the circulation pump 62 is normal is checked (step S71). When the current value is greater than or equal to the threshold value, combustion of the burner 22 is started, and remedy is performed (steps S81 to S87).

  If it is equal to or less than the threshold, the hot water solenoid valve 64 is opened (step S73), the circulation pump 62 is turned on / off (step S75), and air is vented. When the bypass water control valve 32 is “fully closed” (step S 72) and the pouring electromagnetic valve 64 is “open” (step S 73), the pouring amount sensor 58 is turned on (step S 74), and the water is traced back. The hot water is poured into the bathtub 50 through the mouth and the return port. At this time, combustion is not performed. In order to release air reliably, the circulation pump 62 is repeatedly turned ON / OFF five times (step S75). In the meantime, for example, 10 [liter] is poured as a fixed amount of pouring (step S76). The ON time of the circulation pump is set as a fixed time, for example, 7 seconds, and the OFF time is set as a fixed time, for example, 5 seconds. This ON-OFF is repeated for 1 minute, and a fixed amount, for example, 10 [liter]. Pour hot water.

  (4) Motor current check operation

  Again, the current value for determining whether or not the current value of the circulation pump 62 is normal is checked (step S77). If it is equal to or greater than the threshold value, combustion of the burner 22 is started and remedy. If it is equal to or lower than the threshold value, the hot water is poured again to irrigate the circulation pump 62 (step S80), and it is rechecked whether it is equal to or higher than the threshold value. If it is equal to or greater than the threshold value, it is chased. If it is equal to or less than the threshold value (NO in step S77), the number of times is monitored (step S78). An alarm is set (step S79).

  Next, FIG. 7 will be referred to for the second bleeding operation of the memorial operation. FIG. 7 shows an example of the processing procedure of the second bleeding operation of the chasing operation.

  This processing procedure (steps S91 to S110) is a process after the second power-on, and the difference from the first power-on is that the processes (3) and (4) of the air purge are not performed. The other flows are the same.

  Next, FIG. 8 is referred about operation | movement at the time of normal driving | operation. FIG. 8 shows an example of an operation processing procedure during normal operation.

  This processing procedure (steps S111 to S124) is a processing procedure for bleeding air during normal use. When the hot water W is heated and circulated to the bath heat exchanger 56 at the time of remembrance, air may be separated from the hot water W in the hot water supply circuit 5, and air may accumulate in the hot water supply circuit 5 or the circulation pump 62. Therefore, air is removed every day when hot water is used.

  The previous air bleed operation (hot water supply circulation) is stored, and after 24 hours have elapsed, a timer is used to perform the air bleed operation.

  Whether 24 hours have passed since the previous bleed operation (step S111), whether more than 10 minutes have passed since the combustion stopped (step S112), whether hot water supply, automatic, or warm operation is being performed (step S113) (flow rate) Whether the sensor 20 is ON). If the operation is performed, the operation moves to the air bleeding operation. If not, wait for hot water supply operation.

  The presence / absence of rotation of the circulation pump 62 is detected by a motor rotation pulse (step S114) and a current value (step S117). Next, the circulation pump 62 is turned on (step S119), a rotation pulse of the motor is detected (step S120), and it is confirmed whether the circulation pump 62 is operating normally.

  When it is detected by the flow sensor 20 that hot water has been supplied (bleeded out) for 5 [liters] or more (step S122), a hot water supply operation check is performed (step S123). The hot water supply operation refers to determining whether a hot water tap is being used or whether an automatic or slimy operation is being performed. Actually, when the difference between the flow rate sensor 20 and the pouring amount sensor 58 is 4 [liter] or more, it is determined that hot water is being used. That is, they are used simultaneously. Therefore, when the hot water supply operation is YES, the hot water tap or the like is tightened, and the circulation pump 62 continues to rotate until the difference becomes 3 [liter]. Further, when the hot water supply operation is NO, it is determined that the operation of the automatic warming is performed and the air venting is completed, the circulation pump 62 is stopped (step S124), and the air venting is finished.

[Second Embodiment]

  FIG. 9 is referred to for the second embodiment. FIG. 9 shows an example of the internal structure of the bath water heater 2, (A) shows the internal structure seen from the front, and (B) shows the internal structure seen from the side. 9, the same parts as those in FIG. 1 are denoted by the same reference numerals.

  The bath water heater 2 includes a rectangular casing 200, a bath heat exchanger 56 is disposed on the back side thereof, and an exhaust hole 202 is disposed on the front side.

  In this bath water heater 2, since the heat exchanger that uses the conventional combustion exhaust for heat exchange is changed to the bath heat exchanger 56 that exchanges the heat of hot water into the bath water BW, the bath heat exchanger 56 is made compact. At the same time, there is no need to install the bath heat exchanger 56 in the exhaust passage of the combustion air. The degree of freedom of the arrangement position of the bath heat exchanger 56 is high. Therefore, the heat exchangers 28 and 30 are arranged at desired positions in the housing 200 with a margin. For this reason, the housing 200 is made compact.

[Third Embodiment]

  The third embodiment will be described with reference to FIG. FIG. 10 is a diagram illustrating an installation example of a bath water heater.

  In this installation example, as shown in FIG. 10, a bathtub 50 is disposed in the bathroom 300, and in this case, the bathtub 50 is installed in the vicinity of the wall portion 302 of the bathroom 300. A hot water supply apparatus installation chamber 304 partitioned by a wall 302 is formed at a position adjacent to the bathroom 300, and the bath hot water supply apparatus 2 is installed adjacent to the wall 302 in the hot water supply apparatus installation chamber 304. Since the bath heat exchanger 56 is configured to exchange heat of the high-temperature water HHW into the bath water BW, the bath water heater 2 is reduced in size and size by the downsizing, and the installation area and installation space are reduced. Has contributed to

  The features and advantages of the first, second, and third embodiments described above are listed as follows.

  (1) Since the bath water can be heated (reheated) with the heat of hot water, the heat exchange means can be miniaturized and the hot water supply apparatus can be made compact.

  (2) Air (air) that has entered the circulation path of hot water can be removed, and problems due to residual air can be prevented.

  (3) Residual water in the circuit can be removed and the circuit can be kept clean.

  (4) The idle operation time of the circulation pump in the circulation path can be shortened, and the durability of the circulation pump can be improved.

  (5) When a predetermined operation is performed, the current value of the DC motor that drives the circulation pump is monitored, and when the current value is less than the lower limit value of the normal value range set in advance, it is determined that the engine is idling. Performs air bleeding and normal circulation.

  (6) In conventional equipment, two direct heating type heat exchangers for hot water supply and reheating are necessary, and when making the equipment highly efficient, the number of parts increased, which prevented compactness. In this bath hot water supply device 2, by having a hot water supply circulation circuit by the circulation pump 62, the memory heat exchanger can be made compact, and the hot water supply device can be made compact.

  (7) A threshold value is provided for the current value of the circulation pump as a countermeasure against air biting (air intrusion) when circulating hot water with a circulation pump or draining equipment, and it is possible to deal with problems caused by air leakage by using an air bleeding sequence. .

  (8) The current value of the pump is detected during circulation pump operation. When air is generated in the circulation circuit, the current value of the pump decreases. By setting a threshold value for the current value and performing an air venting operation in the circuit, it is possible to eliminate a failure factor that affects the device performance due to air biting.

  (9) In the operation operation such as the automatic operation operation, the circulating pump is operated and the clean water is circulated in the bath circuit, so that the stagnant water is not generated and can be kept clean.

  (10) A pre-check is performed to detect idle operation of the circulating pump when performing automatic operation, etc., and air venting is performed during idle operation, so that the circulation operation of the pump can be performed smoothly.

  (11) Since the circulation pump is a DC motor and is not self-priming, the idle operation time is reduced by performing the idle operation check, so that the durability of the pump is improved.

  (12) After the initial test run or after draining water to prevent freezing, the pump is automatically primed, so that it is not necessary to fill water manually.

[Other Embodiments]

  In the above embodiment, alarm generation is executed by the voice notification unit 101, but the present invention is not limited to this. The display unit 100 may be used for generating an alarm.

As described above, the most preferable embodiment and the like of the present invention have been described. However, the present invention is not limited to the above description, and is described in the claims or disclosed in the specification. It goes without saying that various modifications and changes can be made by those skilled in the art based on the above gist, and such modifications and changes are included in the scope of the present invention.

DESCRIPTION OF SYMBOLS 2 Bath water heater 3 Hot-water supply function part 4 Hot-water supply function part 5 Hot-water supply circulation path 6 Bath water tracking function part 10 Combustion exhaust 12 Hot-water supply line 14 Supply air fan 16 Supply water line 17 Incoming water temperature sensor 18 Hot water temperature sensor 20 Flow rate sensor 24 Combustion chamber 26 Feed water temperature sensor 28 Latent heat exchanger 30 Sensible heat recovery heat exchanger

Claims (2)

Heat exchange means for exchanging heat of hot water into bathtub water;
A circulation pump installed in a circulation path for flowing the warm water to the heat exchange means and flowing the warm water to the circulation path;
When the current flowing through the motor that drives the pump is less than a reference value, the controller supplies water to the circulation path, and intermittently operates the pump during the water supply;
A hot water supply apparatus comprising:   The hot water supply apparatus according to claim 1, wherein hot water is periodically poured into the circulation path from a hot water supply circuit, and the accumulated water in the circulation path is replaced with the high temperature water.

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