JPH08189705A - Control method of pouring hot-water for filling bath device with hot-water - Google Patents

Abstract

PURPOSE: To carry out hot-water-pouring for filling a bath device with hot-- water efficiently within a short period of time by a method wherein hot-water and water are poured together to a set water level when an amount of hot-water, which is corresponding to a reference water level slightly below the position of a circulating fitting, has been poured but the flow of water in an additional heating circulation passage can not be detected. CONSTITUTION: A control device 34 sets a reference water level slightly below the position of a circulation fitting 2 and pours hot-water to the reference water level slightly below the circulation fitting 2 when there is no remaining water (the level of water in a bathtub has not arrived at the upper position of the circulation fitting 2) upon starting the operation of automatic hot-water pouring. Thereafter, when an additional heating water conducting switch 16 is confirmed that it is put OFF, the control device 34 does not pour hot-water to the level slightly upper than the circulation fitting 2 but poures hot-water to a set level in one operation. According to this method, the filling of a bathtub with hot-water can be effected efficiently within a very short period of time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot water pouring control method for an automatic bath kettle having a reheating function and a hot water filling function.

[0002]

2. Description of the Related Art The hot water produced by a hot-water supply heat exchanger is sent to a reheating circulation path (reheating recirculation pipeline), and the hot water is dropped into the bathtub through this reheating circulation pipeline to perform automatic filling. Bath pots are widely used.

The automatic bathtub of recent years is provided with a sequence program for a storage mode and an execution mode in a controller for filling the bath, and by operating in the storage mode, the relationship between the amount of water supplied to the bathtub and the water level water pressure of the bathtub is obtained. Then, for example, the device itself creates a pouring control graph for filling the pouring as shown in FIG.
During operation in the execution mode, the bath is automatically filled with water according to the created pouring control graph.

FIG. 3 shows an example of the system configuration of an automatic bathtub having the above-described automatic filling function. In the figure, a reheating heat exchanger 7 is provided above the bath burner 6, one end of a pipe 17 is connected to the inlet side of the reheating heat exchanger 7, and the other end of the pipe 17 is circulated. It is connected to the discharge side of the pump 18. A bath temperature sensor 9 such as a thermistor for detecting the temperature of the water flow is provided in the conduit 17.

A return pipe 15 of the reheating circulation line 14 is connected to the suction side of the circulation pump 18, and the return port side (inlet side) of the return pipe 15 is connected to the side wall of the bathtub 1 via the circulation metal fitting 2. It is connected. The return pipe 15 detects the passage of water through the reheating circulation line 14, outputs an ON signal as a water passage detection signal when water passage is detected, and outputs a non-water passage when water passage is not detected. A reheating water flow switch 16 that functions as a water flow detection sensor that outputs an OFF signal as a detection signal is provided. The outlet side of the reheating heat exchanger 7 is connected to the inlet side of the outflow pipe 20 of the reheating recirculation pipeline 14.
The outlet side of is connected to the bathtub side wall via the circulation fitting 2.

A hot water supply heat exchanger 5 is provided above the hot water supply burner 4, and a water supply pipe 11 is connected to an inlet side of the hot water supply heat exchanger 5, and the water supply pipe 11 serves as a flow rate detecting means. It is connected to a water supply source such as tap water through a sensor (flow rate sensor) 10. A hot water supply pipe 12 is connected to the outlet side of the hot water supply heat exchanger 5, and the hot water supply pipe 12 is guided to a desired hot water supply place such as a kitchen.

A hot water filling pipe 21 is branched from the hot water supply pipe 12, and the hot water filling pipe 21 is connected to a duct 17 of a reheating circulation duct 14 via a pouring electromagnetic valve 24. A pressure sensor 26 as a water level detecting means of the bathtub 1 is provided between the connecting portion and the pipe line between the pouring electromagnetic valve 24.

In the figure, 33 is a gas pipe, 52 is a water inlet temperature sensor, and 53 is a hot water outlet temperature sensor.

A hot water supply operation, a reheating operation, and a pouring hot water filling operation of the automatic bath heater are performed by a control device 34, and a remote control 35 is connected to the control device 34.

In this automatic bath kettle, by opening the pouring solenoid valve 24, water enters the hot water supply heat exchanger 5 from the water supply pipe 11, and the flow sensor 10 detects the water flow through the water supply pipe 11 to supply hot water. The burner 4 burns, and the combustion thermal power heats the water passing through the hot water supply heat exchanger 5 into hot water, which passes through the hot water filling pipe 21 into the reheating circulation pipe 14 and further Return pipe 15 and forward pipe 20 of the reheating circulation line 14
It is poured into the bathtub 1 through. The operation of the hot water pouring is controlled based on the pouring control graph shown in FIG. 4 created by the control device 34 itself.

FIG. 1 shows the components of a control device 34 for pouring the molten metal, which includes a signal input section 36, a water level detection section 37, and
Water amount detector 38, pressure sensor corrector 50, pouring controller 41
And is configured. The signal input unit 36 includes a bath temperature sensor 9, a flow sensor 10, and a reheating water switch 16
, And receives signals from the pressure sensor 26 and the remote controller 35, and applies corresponding signals to the respective parts 37, 38, 41, 50. Water level detector 37
Receives the water pressure detection signal from the pressure sensor 26, detects the bath water level by pressure, and applies the detection signal to the pouring controller 41. The water amount detection unit 38 receives the flow rate detection signal from the flow sensor 10, integrates the detected flow rates to detect the amount of water poured into the bath, and adds the water amount detection signal to the pouring control unit 41. In this specification, the term "pouring water" is used as a broad concept including both the case of pouring unheated water and the case of pouring heated water into hot water.

The pressure sensor correction unit 50 connects the reheating circulation line 14 to the bathtub when the reheating recirculation line 14 is filled with hot water by a predetermined amount of water flow at the start of the pouring operation. The water level pressure at the reference point in the mouth (the reference point slightly above the circulation fitting 2) is taken in, the amount of deviation due to aging of the pressure sensor 26 is calculated, and the deviation is temperature compensated based on the temperature detected by the bath temperature sensor 9. To correct.

The pouring control section 41 contains a pouring control graph,
According to this pouring control graph, the pouring and pouring operation is controlled according to a preset pouring and pouring sequence program.

FIG. 5 specifically shows the automatic hot water filling operation of the automatic bath kettle. Next, the hot water filling operation of the bathtub will be described with reference to this flowchart. First, in step 101, when the automatic switch such as the remote control 35 is turned on, the circulation pump 18 is turned on for a short time in step 102, and in step 103, the reheating running water switch 16 is turned on.
Is turned off. At this time, for example, bathtub 1
When the water level in the bathtub 1 has not reached the water level higher than that of the circulation fitting 2, the reheating water switch 16
Is turned off, while on the other hand, when there is residual water in the bathtub 1 and the water level of the bathtub is higher than the position of the circulation fitting 2, the reheating water switch 16 is turned on, so in step 103, the reheating water switch 16 is turned on. If it is, the process proceeds to step 115, and in step 115, the reheating operation is performed.

During this reheating operation, the reheating circulation pump 18 is started with the pouring electromagnetic valve 24 closed. Then, the hot and cold water in the bathtub 1 is reheated and recirculated.
The circulating hot water flow is detected by the reheating hot water switch 16, and the control device 34 controls the combustion of the bath burner 6 to heat the circulating hot water passing through the reheating heat exchanger 7 to drive it. The burning is done. Then, when the temperature of the hot water in the bathtub 1, that is, the temperature of the hot water detected by the bath temperature sensor 9 reaches the bath set temperature, the reheating circulation pump 18 is stopped and the combustion of the bath burner 6 is stopped. Then the driving operation ends.

When the reheating operation is completed in step 115, the pressure is detected by the pressure sensor 26 in step 116, and the process proceeds to step 117.

In step 117, it is judged based on the pressure detected in step 116 whether or not the detected bath water level has reached the set water level. If the detected water level is below the set water level, in step 118 The amount of water up to the set water level is calculated based on the hot water control graph, the calculated amount of water is poured, the water pressure level of the bathtub 1 is detected again in step 119, and steps 117 to 119 are repeated until the bath water level reaches the set water level. Repeat the operation up to and pour the amount of water up to the set water level.

When it is determined in step 117 that the bath water level has reached the set water level, step 120
Then, carry out reheating by the same reheating operation as above,
In step 122, the boiling buzzer is turned on.

On the other hand, when it is judged in step 103 that the reheating water flow switch 16 is off, step 104
Then, the pouring electromagnetic valve 24 is opened, and the hot water produced on the hot water supply heat exchanger 5 side enters from the hot water filling pipe 21 into the reheating circulation pipe line 14 and from both sides of the return pipe 15 and the forward pipe 20. In bathtub 1,
A predetermined amount of pump priming water, such as 10 liters, is poured. By pouring this priming water, the reheating circulation line 14
The inside is not flooded and is filled with the pouring water.

Next, in step 105, the circulation pump 18 is again used.
Is turned on for a short time. Then, in step 106, it is judged whether or not the additional heating water switch 16 is off. The amount of priming water for the pump is set to be a bathtub water level lower than that of the circulation fitting 2. When priming water is poured while the bathtub 1 is empty, the priming water brings the bathwater level to the circulation fitting 2. Therefore, even if the circulation pump 18 is started, the bath water does not circulate in the reheating circulation pipe line 14, and the reheating water switch 16 is turned off. When the reheating water flow switch 16 is off, in step 107, in order to perform pouring to the vicinity of the circulation fitting 2,
The amount of water corresponding to the water level slightly below the circulation fitting 2 is obtained based on the pouring control graph, and this amount of water is poured.
Proceed to 8.

At step 108, the circulation pump 18 is turned on again for a short time, and at step 109, it is judged whether or not the reheating water switch 16 is off. And
When it is confirmed that the reheating water flow switch 16 is off, this time, in step 110, the bath water is poured little by little until the bath water level reaches the reference point slightly above the circulation fitting 2. Then, in step 111, the circulation pump 18 is turned on again, and the operations from step 110 to step 112 are repeated until the reheating water flow switch 16 is turned on in step 112, and in step 112, the reheating water flow switch is turned on. If it is confirmed that 16 is turned on, the water level in the bathtub 1 is detected by the pressure detection by the pressure sensor 26 in step 113, and then step 114
Proceed to.

When the automatic switch is turned on in step 101, the bath water level has not reached the position of the circulation fitting 2, but the bathtub 1 is not empty, and step 104
By pouring the priming water into the pump, the water level of the bathtub reaches the upper side of the circulation fitting 2 and, as a result, the reheating water switch 16 is turned on in step 106, or step 107
By pouring the water in the bathtub, the bathtub water level reaches the upper side of the circulation fitting 2, and when the reheating water switch 16 is turned on in step 109, the process proceeds to step 115, and the operations after step 115 are performed. I do.

At step 114, the pressure sensor correction unit 50 corrects the pressure sensor 26. This correction is performed by the water pressure detection value of the pressure sensor 26 in a normal state in which the water pressure detection value of the pressure sensor 26 does not distort during installation and construction of the appliance (automatic bathtub) (this value is stored as a judgment reference value in a memory or the like). It is performed by correcting the output of the pressure sensor 26 to a correct value, and, for example, the water level at the connection port of the reheating circulation line 14 when the pressure sensor 26 has no deviation ( When the detection output of the water level slightly above the circulation metal fitting 2) is V ₁ and when the detection output of the pressure sensor 26 this time is V ₁ + ΔV, it is determined that the deviation of ΔV has occurred, and the pressure sensor 26 detection output V ₁ + ΔV
Is corrected to V ₁ .

After the pressure sensor 26 is corrected in step 114, the process proceeds to step 117, and
The operations from 117 to step 122 are performed, and the automatic filling operation is completed.

In this kind of automatic bath pot, the step
When the boiling buzzer sounds at 122 and the reheating operation is completed, the warming mode is shifted to a predetermined time (for example, 4 hours) from the end of the reheating operation, and in this warming mode, for example, a time interval of 30 minutes or the like. Starts the reheating circulation pump 18 to circulate the hot water in the bathtub through the reheating circulation line 14, and at this time, the temperature of the hot water in the bathtub detected by the bath temperature sensor 9 exceeds a predetermined temperature with respect to the bath set temperature. When the temperature has dropped, the bath burner 6 is burned to raise the temperature of the hot water of the bathtub to a set temperature, etc. to keep the hot water of the bathtub warm.

In this warming operation, in the case of the bath apparatus having the water level holding function, during the warming mode,
Always, the bath water is monitored by the water level detection signal of the pressure sensor 26, and when the bath water level falls below the allowable range from the set water level, the amount of water shortage up to the set water level is calculated based on the water filling control data. The calculated amount of water is obtained, and the pouring electromagnetic valve 24 is opened to add the hot water on the side of the hot water supply heat exchanger 4 to perform the water level holding operation for holding the bath water level at the set water level.

[0027]

By the way, when a person uses a bath device such as the above automatic bath kettle, it is naturally desirable that the operation from the start to the end of the automatic water filling is performed quickly. There is a demand for more efficient tensioning operation.

However, conventionally, in the automatic filling operation of the automatic bath kettle, when the operation starts, the bath water level is set to the circulating metal fitting 2.
When the position has not reached, the pouring water is poured little by little to the reference water level slightly above the circulation metal fitting 2 as shown in FIG. 5, and it is confirmed that the reheating water switch 16 is turned on. When 16 is turned on, this position is used as the position of the circulation fitting 2, and the bath water level at this position is confirmed. The amount of water from the circulation fitting position (confirmed water level) to the set water level is based on the pouring control graph. Since it was sought and poured, the filling operation took a very long time, which was a problem.

The present invention has been made to solve the above-mentioned conventional problems, and an object thereof is to provide a method for controlling the pouring of a bath apparatus, which can efficiently perform the pouring of pouring in a short time. To do.

[0030]

In order to achieve the above object, the present invention is constructed as follows. That is, the present invention detects the water injection amount of the bath by the flow rate detecting means,
It is a method of pouring pouring of a bath device that detects the bath water level by means of water level detection means and pours the pouring water until the set water level is reached based on the pouring control graph showing the relationship between the bath water pouring amount and the bath water level. Then, based on the pouring control graph, a water amount corresponding to a reference water level slightly below the position of the circulating metal fitting that connects the reheating circulation path to the bathtub is obtained as the first reference water amount, and A water amount difference between the reference water amount of 1 and the set water amount corresponding to the set water level is obtained based on the pouring control graph to form a second reference water amount, and hot water of the first reference water amount is poured into the bathtub. Then, after that, try to operate the circulation pump that circulates the hot water in the bathtub through the reheating circulation path, and the running water detection sensor that detects the water flow in the reheating circulation path is outputting a non-detection signal of water flow. Confirm that the second standard amount of water Until the predetermined water level by pouring bulk water bath is configured as characterized in that the pouring of the tub.

Further, at the end of pouring into the bathtub to the set water level, the bath water level at this time is detected by the water level detecting means to form the detected water level as the heat retention reference water level, and then detected by the water level detecting means. When the water level of the detected bathtub falls below the tolerance range given in advance from the heat retention reference water level,
It is also possible to determine the amount of water shortage to the heat insulation reference water level based on the pouring control graph, and to add hot water of the water shortage to the bath to keep the bath water level at the water temperature reference water level. It has a characteristic structure.

[0032]

In the present invention having the above-described structure, the water amount corresponding to the reference water level slightly below the position of the circulating metal fitting is determined based on the pouring control graph showing the relationship between the bath water pouring amount and the bath water level. Of the reference water amount, and the difference between the first reference water amount and the set water amount corresponding to the set water level is calculated and used as the second reference water amount. And first, the first
The standard amount of hot water is poured into the bathtub, and after that, the circulation pump that circulates the hot water in the bathtub through the reheating circuit is operated, and at this time, the running water detection that detects the water flow in the reheating circuit is detected. When it is confirmed that the sensor outputs the non-detection signal of water flow, the hot water having the second reference water amount is collectively poured into the bathtub, thereby pouring the hot water into the bathtub up to the set water level. Done.

[0033]

Embodiments of the present invention will be described below with reference to the drawings. In the description of the present embodiment, the same reference numerals will be given to the same names as those in the conventional example, and the detailed description thereof will be omitted.
The bath apparatus to which the method for controlling the filling of the bath apparatus of the present embodiment is applied is an automatic bath kettle having the system configuration shown in FIG. 3, and the control unit 34 has the components shown in FIG. There is. The characteristic of the method for controlling the pouring of pouring water in the bath device of this embodiment is that it is different from the method of controlling pouring water in the conventional bath device, in which the reference water level is set slightly below the position of the circulation fitting 2, There is no residual water at the start of the automatic filling operation (circulation fitting 2
When the bath water level does not reach the upper position of the), the pouring water is poured to a reference water level slightly below the circulation fitting 2 and then, if it is confirmed that the reheating water flow switch 16 is off, circulation is performed. That is, the molten metal is not poured up to a little above the metal fitting 2, but the molten metal is collectively poured up to the set water level. In this embodiment, the pressure sensor correction unit 50 of FIG.
The control device 34 may be configured by omitting.

FIG. 2 shows a flow chart specifically showing the automatic water filling operation performed based on the method for controlling the water filling of the bath apparatus of this embodiment. The operation of the embodiment will be described. First, the operation from step 101 to step 106 is shown in FIG.
The same procedure as the automatic filling operation of the conventional example shown in FIG. 6 is performed, and when it is determined in step 106 that the reheating water flow switch 16 is off, in step 107, the position slightly below the position of the circulation fitting 2 is set. The water amount corresponding to the reference water level is obtained based on the pouring control graph as shown in FIG. 4 to form the first reference water amount, and the pouring of hot water having the first reference water amount is performed.
Then, in step 108, try to operate the circulation pump 18 for a while, and in step 109, reheat the running water switch 16
Is off, that is, the non-detection signal of water flow is output.

Then, when it is confirmed in step 109 that the reheating water flow switch 16 is off, step 109
At 118, a set water amount corresponding to the set water level is obtained based on the pouring control graph, and a water amount difference between the set water amount and the first reference water amount is obtained based on the pouring control graph to obtain a second
The amount of hot water having the second standard amount of water is collectively poured into the bathtub 1.

After the completion of the batch pouring in step 118, the operation of detecting the bath water level at this time is not performed, and in step 120, the reheating operation similar to the conventional example is performed, and the reheating operation is completed. At this time, in step 121, the bath water level at this time is detected by the pressure sensor 26 and set as the heat retention reference water level, and in step 122, the boiling buzzer is sounded and the reheating is finished.

Also in this embodiment, when the reheating water flow switch 16 is turned on in steps 103, 106, and 109, the process proceeds to step 115, and the operations from steps 115 to 117 are performed as in the conventional example. Is done.

Also in this embodiment, the warming operation of the hot water in the bathtub in the warming mode is performed in the same warming mode as in the conventional example from the end of the reheating operation in step 122 for a predetermined time. The holding operation is performed based on the warming reference water level set in step 121 of FIG. In other words, the pressure sensor is
The bathtub water is monitored by the water level detection signal of 26, and when the detected bathtub water level detected by the pressure sensor 26 falls below the warming reference water level beyond a predetermined allowable range, the hot water is kept warm based on the pouring control graph. In order to find the amount of water shortage up to the reference water level and to maintain the bathtub water level at the heat retention reference water level, hot water of the above-mentioned amount of water shortage is added to the bathtub 1 and hot water is poured.

According to this embodiment, when it is confirmed by the above operation that the reheating water flow switch 16 is off after the pouring to the reference water level slightly below the circulation fitting 2 is completed, the reference water level is responded to. The bath water of the second standard water amount from the first standard water amount to the set water amount corresponding to the set water level
In order to be poured all at once, until the bath water level reaches a little above the circulation fitting 2 and it is confirmed that the reheating and running water switch 16 is turned on, the conventional pouring operation in which pouring is done little by little Unlike the method, pouring does not take a long time. Moreover, in the present embodiment, it is possible to omit the conventional operation of confirming the water level at the position of the circulation fitting 2, so that it is possible to efficiently perform the filling and pouring in a very short time.

Further, according to the present embodiment, the water level maintaining operation allows the water level of the bathtub 1 to be constantly maintained during the heat retention mode, so that the bath user can comfortably use the bathtub 1. It will be possible. The heat retention reference water level that serves as the reference for this water level holding operation is set by detecting the bathtub water level at the end of the automatic filling operation and setting this water level as the heat retention reference water level. The setting can be easily performed, and the water level can be easily maintained based on the heat retention reference water level.

The present invention is not limited to the above-mentioned embodiments, and various embodiments can be adopted. For example, in the above embodiment, the second reference water amount is obtained when it is confirmed in step 109 that the reheating water flow switch 16 is off. However, the second reference water amount is obtained in advance before the operation of step 109. It doesn't matter.

Further, in the above embodiment, the bath water level at this time is detected at the end of the automatic filling operation, the detected water level is set as the heat retention reference water level, and during the heat retention mode based on this heat retention reference water level. I tried to keep the water level of
The water level holding operation may be performed on the basis of a preset water level, or such a water level holding operation may be omitted. However, by performing such a water level holding operation, it becomes possible for the bath user to use the bath more comfortably, so it is preferable to perform the water level holding operation.

[0043]

According to the present invention, the amount of water corresponding to the reference water level slightly below the position of the circulating metal fitting is calculated based on the pouring control graph showing the relationship between the amount of water poured into the bath and the water level of the bath. Of the first reference water amount and the water amount difference between the first reference water amount and the set water amount corresponding to the set water level are obtained as the second reference water amount, and when the hot water of the first reference water amount is poured into the bathtub, When water is not detected in the reheating circulation circuit connected to, the hot water of the second standard water amount is collectively poured into the bathtub to pour the water up to the set water level. Unlike the conventional filling method, which involves pouring little by little until reaching the position slightly above the position of the circulation fitting and confirming that water has been detected in the reheating circulation path, it takes a long time to pour. It does not take time and the water flow in the reheating circuit is detected. Since it is possible to omit the operation of detecting the bathtub water level at this time by using the bathtub water level at that time as the position of the circulation fitting, it is possible to efficiently fill the bathtub with water in a very short time. it can.

Further, when the pouring of water into the bathtub up to the set water level is completed, the bath water level at this time is detected by the water level detection means to form the detected water level as the warming reference water level, and then detected by the water level detection means. When the detected bathtub water level falls below the warming reference water level beyond a predetermined allowable range, the insufficient water amount to the warming reference water level is obtained based on the pouring control graph, and the bathtub water level is set as the warming reference water level. According to the present invention, in which hot water of the insufficient water amount is added to the bathtub to hold it, according to the present invention, it becomes possible to hold the bathtub water level when the hot water of the bathtub is kept warm with reference to the warming reference water level. Therefore, it becomes possible for a bath user to use the bath device comfortably. Moreover, the heat retention reference water level, which is the reference for performing this water level holding operation, is detected by the hot water pouring operation.
To be performed at the end of pouring into the bathtub up to the set water level,
It is possible to detect and set the heat retention reference water level very easily, and to easily perform the water level holding operation.

[Brief description of drawings]

FIG. 1 is a block configuration diagram of an example of a control unit that performs a method of controlling hot water pouring of a bath device.

FIG. 2 is a flow chart showing an example of an automatic water filling operation by the water filling filling control method for a bath device according to the present invention.

FIG. 3 is an explanatory diagram showing a system configuration of an automatic bath heater.

FIG. 4 is an explanatory diagram showing an example of a pouring control graph.

FIG. 5 is a flow chart showing an automatic filling operation by a conventional filling method of filling a bath device.

[Explanation of symbols]

 16 Reheating water switch 26 Pressure sensor 34 Controller 38 Water amount detector 41 Pouring controller

Claims (2)

[Claims] 1. The amount of pouring water in the bathtub is detected by the flow rate detecting means, the water level of the bathtub is detected by the water level detecting means, and the set water level is reached based on a pouring control graph showing the relationship between the bath water pouring amount and the bath water level. A pouring pouring control method for a bath device for pouring pouring, in which the pouring control is performed with a water amount corresponding to a reference water level slightly below the position of a circulating metal fitting that connects a reheating circulation circuit to a bathtub. First based on the graph
Of the first reference water amount and a water amount difference between the first reference water amount and the set water amount corresponding to the set water level are obtained based on the pouring control graph to form a second reference water amount, After pouring a standard amount of hot water into the bathtub, and then operating the circulation pump that circulates the hot water in the bathtub through the reheating circulation path, the running water detection sensor that detects the passage of water through the reheating circulation path A bath characterized by confirming that a non-detection signal is output, and then pouring the second standard amount of hot water into the bathtub all at once, thereby pouring the bath to the set water level. Control method for pouring of molten metal in equipment. 2. At the end of pouring the water into the bathtub up to the set water level, the bath water level at this time is detected by the water level detection means to form the detected water level as the heat retention reference water level, and then detected by the water level detection means. When the detected bath tub water level falls below the warming reference water level by exceeding the allowable range given in advance, the deficient amount of water shortage up to the warming reference water level is calculated based on the pouring control graph, and the bathtub water level is kept at the warming reference water level. The hot water pouring control method for a bath apparatus according to claim 1, wherein the hot water of the insufficient water amount is added to the bathtub to do so.