JP2003214703A - Hot/cold water mixing unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To effectively use warm water from a warm water supply device even if a warm water temperature detected in a hot/cold water mixing unit and a warm water temperature stored in the warm water supply device are different, in a hot/cold water mixing unit 1 for connecting the warm water supply device 5 such as a solar water heater to an auxiliary heat source machine 7 such as a water heater. <P>SOLUTION: If a warm water temperature detected by a warm water temperature sensor is not higher than a reference temperature set higher by a given temperature α than a cold water temperature detected by a cold water temperature sensor, a mixing control means of the hot/cold water mixing unit 1 operates a warm water side of a hot/cold water mixer 3 in a valve opening direction. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention connects, for example, a hot water supply device including a solar water heater using natural energy or a water heater using various kinds of waste heat to an auxiliary heat source device such as a water heater. It is a technology relating to the effective use of hot water from a hot water supply device in a hot water mixing unit.

[0002]

2. Description of the Related Art As shown in the schematic view of FIG. 1, in order to extract hot water of a desired temperature regardless of the weather, a solar water heater 5 which is the hot water supply device and a water heater which is an auxiliary heat source device. A solar hot water supply system in which 7 and 7 are connected by a hot and cold water mixing unit 1 is known.

Such a solar hot water supply system is intended to reduce the combustion amount of the hot water supply device 7 as much as possible by effectively utilizing the hot water of the solar water from the solar water heater 5 to obtain an energy saving advantage. Therefore, the hot and cold water mixing unit 1 determines the mixing ratio of the hot and cold solar water, and controls the operation of the hot and cold water mixer 3 so that this mixing ratio is achieved.

Specifically, when the hot water temperature of the solar water is higher than the hot water set temperature, the hot water mixer 3 is controlled so as to adjust the mixed water of the hot water set temperature which does not need to be heated in the water heater 7. is doing. On the other hand, when the solar hot water temperature is lower than the hot water set temperature, the hot water is mixed and adjusted so that the mixed water of the mixing target temperature obtained by subtracting the rising temperature at the time of the minimum combustion of the water heater 7 from the hot water set temperature is adjusted. The mixer 3 is controlled.

[0005]

However, as described above, there are cases where the hot and cold water mixer 3 cannot mix and adjust the mixed water having the mixing target temperature. That is, the case where the mixing target temperature is higher than the solar hot water temperature and the cold water temperature (mixing target temperature> solar hot water temperature, cold water temperature) or low (target mixing temperature <solar hot water temperature, cold water temperature) can be considered. In such a case, the conventional hot and cold water mixing unit 1
Controls the operation of the hot water mixer 3 such that one of the solar hot water temperature and the cold water temperature having a temperature close to the mixing target temperature is fully opened and the other is fully closed.

For example, the cold water temperature in the summer hot water may be relatively high during the first use in the morning when the solar hot water in the solar hot water pipe 56 is cold. At this time, when the mixing target temperature is higher than the solar hot water temperature and the cold water temperature and the solar hot water temperature is lower than the cold water temperature (mixing target temperature> cold water temperature> solar hot water temperature), the conventional hot and cold water mixing unit 1
The cold water side of the mixing valve is fully opened and the solar hot water side is fully closed, and the cold water in the cold water circuit 15 is sent to the water heater 7.

That is, the hot and cold water mixing unit 1 of this example recognizes the solar hot water temperature detected by the hot water temperature sensor 19 provided in the hot water circuit 14 as the solar hot water temperature of the solar water heater 5. . Therefore, for example, when the low temperature solar hot water cooled in the solar hot water pipe 56 connecting the solar water heater 5 and the hot water mixing unit 1 is passed at the beginning of the operation of the hot water mixing unit 1, The hot and cold water mixing unit 1 recognizes this low temperature solar hot water temperature as the solar hot water supplied from the solar water heater 5 and controls the mixing of the hot and cold water mixer 3.

Specifically, the solar hot water temperature in the solar water heater 5 is 60 ° C., the cold water temperature is 20 ° C., and the solar hot water cooled to 18 ° C. is stored in the solar hot water pipe 56. In this case, if the hot water supply temperature of the water heater 7 is set to 50 ° C and the operation is started, the hot water circuit 14 is set to 18 ° C.
The hot water mixing unit 1 recognizes that the solar hot water temperature of the solar water heater 5 is 18 ° C. Then, the hot and cold water mixing unit 1 has the target mixing temperature higher than the solar hot water temperature and the cold water temperature and the solar hot water temperature lower than the cold water temperature based on the respective detected values (mixing target temperature> cold water temperature> solar hot water temperature). If it is determined that the cold water side of the mixing valve is fully opened and the solar hot water side is fully closed, the operation control of the hot and cold water mixer 3 is performed.

When the solar hot water side of the mixing valve is completely closed in this way, the hot solar hot water of the solar water heater 5 will not be taken into the hot / water mixing unit 1 by any time. False recognition of the hot and cold water mixing unit 1 is not corrected. Therefore, even though the mixed water of the hot water set temperature of 50 ° C. can be mixed and adjusted from the hot water of 60 ° C. in the hot water storage tank 51, the cold water of 20 ° C. is continuously heated in the water heater 7, which is a hot and cold water mixing unit. The result is contrary to the energy saving, which is the purpose of 1.

The present invention has been made in view of the above circumstances. "A cold water circuit whose upstream end is a water inlet connected to a water supply pipe from a water source, and an upstream end is a hot water pipe from a hot water supply device. And a hot water circuit that is the hot water inlet connected to the hot water circuit and a mixture that extends from the confluence of the cold water circuit and the hot water circuit and that has a downstream end that serves as the hot water outlet for sending the mixed water at the confluence to the auxiliary heat source machine. A water circuit comprising a water circuit, a hot and cold water mixer for adjusting the mixing ratio of the cold water and the hot water at the confluence point, a cold water temperature sensor for detecting the temperature of cold water flowing through the cold water circuit, and hot water flowing through the hot water circuit. In a hot and cold water mixing unit including a hot water temperature sensor that detects a temperature and a controller that controls the operation of the hot and cold water mixing unit ”,
An object of the present invention is to enable effective use of hot water from a hot water supply device even when the hot water temperature detected in the hot water mixing unit and the hot water temperature stored in the hot water supply device are different.

[0011]

[Means for Solving the Problems] * 1 Technical means of the present invention for solving the above-mentioned problems are as follows: "In the controller, the hot water temperature detected by the hot water temperature sensor is detected by the cold water temperature sensor. And a mixing control means for operating the hot water side in the hot water mixer in the valve opening direction when the temperature is equal to or lower than a reference temperature that is set higher than the cold water temperature by a predetermined temperature.

According to this, when the hot water temperature detected at the initial stage of the operation is lower than the cold water temperature, the main hot water / water mixing unit is irrespective of the mixing target temperature or the hot water set temperature.
The hot water side of the hot water mixer is forcibly opened to preferentially use the hot water. Therefore, the hot water cooled in the pipe can be quickly discharged and the high-temperature hot water of the hot water supply device can be quickly taken into the hot water mixing unit.

Even when the hot water temperature is higher than the cold water temperature, if the hot water temperature is lower than the reference temperature, the same operation as described above is performed. Therefore, in the conventional case, when the target mixing temperature or the hot water set temperature is lower than the cold water temperature,
Although cold water was used with the cold water side fully open and the hot water side fully closed, the main water mixing unit opens the hot water side and preferentially uses the hot water from the hot water supply device. Further, when the target mixing temperature or the hot water set temperature is between the hot water temperature and the cold water temperature, conventionally, the hot water and the cold water were mixed to adjust the mixed water. Hot water is preferentially used as well.

Here, the reference temperature is set higher than the cold water temperature by an allowable fluctuation temperature in the hot water supply system using the hot water mixing unit. Specifically, when a water heater is used as the auxiliary heat source device,
It is desirable that the reference temperature is set to a temperature that is higher than the cold water temperature by about 2 to 3 ° C.

* In the item 1 of paragraph 2, "the mixing control means fixes the hot water side of the hot water mixer to a predetermined set opening when the hot water temperature is equal to or lower than the reference temperature". To do.

According to this, the flow rate of the hot water flowing into the hot water mixer can be restricted. Therefore, when the temperature of the hot water taken into the hot water mixing unit suddenly rises during operation, the hot water side is operated in the valve closing direction to suppress the inflow of hot water into the hot water mixer and the rapid rise in the mixed water temperature. You can This prevents hot hot water from being emitted from the auxiliary heat source device, and provides a good feeling to the user.

Here, the predetermined set opening is the flow rate of hot water flowing from the hot water circuit to the hot water mixer so that the hot water mixer can control the hot water mixer to suppress the sharp rise of the mixed water temperature when the hot water sharply rises. Is set to limit.

* 3 In item 1 or 2, "the reference temperature is lower than the cold water temperature by an allowable temperature difference as a temperature fluctuation of hot water taken out from the auxiliary heat source device connected to the hot water mixing unit. It is set to a high temperature ”.

According to this, if the hot water temperature is equal to or lower than the reference temperature, even if the hot water is conventionally preferentially used when the cold water side is fully opened and the hot water side is fully closed, the auxiliary heat source unit can be used. The temperature fluctuation of the hot water discharged can be suppressed to a small level. Therefore, the user's feeling of use is not impaired, and there is no danger of hot water discharge, which is safe.

[0020]

The present invention having the above-mentioned structure has the following unique effects. The hot and cold water mixing unit of the present invention,
When the hot water temperature is lower than the cold water temperature, and when the hot water temperature is higher than the cold water temperature and is equal to or lower than the reference temperature,
Since the hot water is preferentially used regardless of the mixing target temperature and the hot water set temperature, the hot water from the hot water supply device is quickly taken into the main hot water mixing unit. Therefore, even if the hot water temperature recognized in the main hot water / water mixing unit and the hot water temperature stored in the hot water supply device at the beginning of operation are different, the recognition error of the main hot water / water mixing unit can be quickly corrected to save energy. Since the appropriate operation control can be performed according to the purpose, the hot water of the hot water supply device can be effectively used.

Here, since the water supplied to the hot water supply device and the cold water taken in the cold water circuit are usually supplied from the same water source, when the hot water temperature is lower than the cold water temperature,
Unconditionally preferentially using hot water will not significantly impair the purpose of energy saving.

According to the item (2), it is possible to prevent hot hot water from being discharged from the auxiliary heat source device due to a rapid rise in the temperature of the hot water taken into the hot water mixing unit, and the user feels good.

According to the item (3), when the hot water temperature is lower than the reference temperature, the fluctuation of the hot water discharge temperature from the auxiliary heat source machine can be suppressed to a small level, so that the user's feeling of use is not impaired and the hot water discharge is high. It is safe without the danger of.

[0024]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. In the following embodiments, a solar hot water supply system that uses a hot and cold water mixing unit that is an example of the present invention to connect a solar water heater that is a hot water supply device to a water heater that is an auxiliary heat source device will be described as an example. . A schematic diagram of this solar hot water supply system is shown in FIG. First, the configuration of each part of this solar hot water supply system will be described.

* Solar Water Heater 5 The solar water heater 5 is a heat collector 50 installed on the roof or roof of a building to absorb solar heat, a hot water storage tank 51 for storing hot solar water, the heat collector 50 and hot water storage. A heat storage circulation path 52, which is formed so as to circulate between the tank 51 and filled with a liquid medium for transmitting solar heat. The heat storage circulation path 52 is provided with a cistern 53 and a circulation pump 54 for circulating the liquid medium, and a solar water supply pipe 55 for supplying cold water from a water source such as water supply to the bottom of the hot water storage tank 51. Water tap 57
A drainage circuit 58 comprising a is connected to the bottom. The hot water storage tank 51 is provided on the top of the hot water storage tank 51.
A solar hot water pipe 56 for extracting the solar hot water inside is connected.

When the circulation pump 54 is driven to circulate the liquid medium in the heat storage circulation path 52, the heat collector 50 is collected.
The liquid medium heated by the solar heat inside is moved to the hot water storage tank 51. The liquid medium that has moved into the hot water storage tank 51 exchanges heat with the stored hot water, whereby the water in the hot water storage tank 51 is heated and solar hot water is produced.

* Water heater 7 The water heater 7 has a water heater main body 70 having a heat exchanger 73 heated by a gas burner (not shown), and various operation / display units electrically connected to the water heater main body 70. A remote controller 71 provided with an operation switch, a bath water filling switch, a hot water temperature setting unit, a combustion display unit, etc., is connected to the remote controller by a wiring cable 78, and also has a hot water tap 85 and a bath 81.
A hot water supply controller 72 is provided for performing combustion control so that the hot water discharge temperature becomes the hot water discharge set temperature.

In the water pipe 74 in the water heater body 70,
A water inlet pipe 76 for taking in the mixed water sent out from the hot and cold water mixing unit 1, a hot water outlet pipe 84 having the hot water outlet faucet 85 at its tip, and a forward pipe 82 used for filling and reheating the bath 81. The return pipes 83 are respectively connected.

Hot / Water Mixing Unit 1 As shown in FIG. 1, the hot / water mixing unit 1 has a hot water circuit 14 having an upstream end connected to a solar hot water pipe 56 of the solar water heater 5, and an upstream end having the solar hot water. Water supply pipe 59 branched from the solar water supply pipe 55 of the water heater 5, and a cold water circuit 15 extending from the confluence of the hot water circuit 14 and the cold water circuit 15 and having a downstream end connected to the water heater 7 A water flow circuit 2 comprising a mixed water circuit 29 connected to 76, and a hot and cold water mixer 3 for adjusting the mixing ratio of hot and cold solar water flowing into the mixed water circuit 29 to obtain mixed water of a predetermined temperature. , A unit controller 11 for controlling the operation of the hot and cold water mixing unit 1, and the hot and cold water mixing unit 1
A main power supply 100 for supplying electric power is provided.

The solar hot water circuit 14 has a drain plug 21 with a filter which also has a function of removing the hot water from the upstream end in order, and a vacuum for sucking the outside air and adjusting the internal pressure when the internal pressure of the hot water storage tank 51 drops. A breaker 12, a check valve 13, and a solar hot water temperature sensor 19 that detects the temperature of the hot solar water flowing through the hot water circuit 14 are provided. The unit controller 11 controls the intake of hot solar water into the hot water circuit 14 and the stop of the intake.

The cold water circuit 15 has a drain plug 3 with a filter which also has a function of removing dust from the water in order from the upstream end.
0, a check valve 22 and a cold water temperature sensor 23 for detecting the temperature of the cold water flowing through the cold water circuit 15.

In the mixed water circuit 29, the hot and cold water mixer 3, the water amount sensor 32, and the mixed water temperature sensor 33 are arranged in this order from the upstream end.
Further, there is provided a pressure relief valve / water drain plug 35 which opens to release the pressure when the water pressure in the mixed water circuit 29 excessively rises.

The hot and cold water mixer 3 has a hot water mixing valve 25 provided at a connection point between the hot water circuit 14 and the mixed water circuit 29.
And a cold water mixing valve 24 provided at a connection point between the cold water circuit 15 and the mixed water circuit 29. The hot water mixing valve 25 and the cold water mixing valve 24 are configured to be advanced and retracted according to the rotation of a motor whose operation is controlled by a control signal from the unit controller 11.

The unit controller 11 determines the mixing ratio of the solar hot water and the cold water from the hot water temperature of the solar water and the cold water temperature, the set hot water temperature of the remote controller 71, and the flow rate of the mixed water. 3. The mixing control unit 111 that controls the operation of No. 3, the first solar hot water temperature determination unit 112 that determines whether the solar hot water is lower than the reference temperature, and the solar hot water is higher than the reference temperature. In this case, a second solar hot water temperature determination unit 113 and the like for determining whether or not the solar hot water is lower than the hot water outlet set temperature is provided.

Further, the unit controller 11 of this example
Is connected to the remote controller 71 by a communication line 77,
A communication unit 114 is provided for receiving various kinds of information such as hot water discharge set temperature of the remote controller 71 and operation mode information such as automatic filling of the bath 81.

* Operation of Hot / Water Mixing Unit 1 Next, a specific operation of the hot / water mixing unit 1 will be described below with reference to the flowchart of FIG.

When the hot water supply to the hot water tap 85 or the bath 81 is started and the water flow in the mixed water circuit 29 is detected by the signal from the flow rate sensor 32 in step S1, the unit controller 11 makes the Intake of solar hot water from the solar water heater 5 into the hot water circuit 14 is started.

In response to this, in step S2, the solar hot water temperature detected by the hot water temperature sensor 19 in the first solar hot water temperature determination unit 112 is the reference temperature (cold water temperature + α).
A determination is made as to whether it is: In this example, the predetermined temperature α is the water heater 7 of this solar water heating system.
Temperature that can be tolerated as temperature fluctuation of hot water discharged from the water (temperature that does not impair the user's feeling of use), α = 3 ° C
Is set to. In practice, the mixed conditioned mixed water is
After being discharged from the mixed water circuit 29 to the water heater 7 through the water inlet pipe 76, the hot water is discharged through the water pipe 74 in the water heater 7, so that the hot water caused by the temperature difference of 3 ° C. during mixing adjustment Fluctuations in temperature will be less than 3 ° C.

If the first solar hot water temperature determination unit 112 determines that the solar hot water temperature is equal to or lower than the reference temperature (cold water temperature + α), the process proceeds to step S3, where the mixing target temperature and the hot water set temperature are related. Instead, control is performed to fix the hot water mixing valve 25 of the hot water mixer 3 to a predetermined set opening. At this time, the cold water mixing valve 24
Is adjusted to an appropriate opening according to the set opening of the hot water mixing valve. In this example, the set opening is set to an opening that can limit the flow rate of the solar hot water flowing through the hot water circuit 14 to 14 liters / minute. The flow rate of the solar hot water of 14 liters / minute is the hot water mixing valve 25 and the cold water mixing valve 24 when the solar hot water suddenly rises to a virtual maximum temperature (for example, 80 ° C.) assumed to be supplied from the solar water heater 5. The flow rate that can suppress the temperature rise of the mixed water mixed and adjusted by the hot water mixer 3 to a predetermined temperature (for example, 3 ° C.) or less is experimentally obtained.

On the other hand, the first solar hot water temperature determination unit 112.
When it is determined that the solar hot water temperature is higher than the reference temperature (cold water temperature + α) in step S4, the process proceeds to step S4,
The second solar hot water temperature determination unit 113 determines whether the solar hot water temperature is equal to or lower than the hot water outlet set temperature.

Then, the second solar hot water temperature determination unit 11
When it is determined in 3 that the solar hot water temperature is lower than or equal to the hot water outlet set temperature, the process proceeds to step S5, and the mixture target obtained by subtracting the temperature rising when the water heater 7 operates at the lowest combustion from the hot water outlet set temperature. The operation control of the hot water mixer 3 is performed so as to mix and adjust the temperature of the mixed water.

The second solar hot water temperature determination unit 113 is also provided.
When it is determined that the solar hot water temperature is higher than the hot water set temperature, the operation proceeds to step S6, and the operation control of the hot water mixer 3 is performed so as to mix and adjust the mixed water having the hot water set temperature.

For example, as in the above-mentioned conventional example, at the beginning of the operation of this solar hot water supply system, the solar hot water pipe 5
When the solar hot water cooled to the cold water temperature or less in 6 is taken into the hot water / water mixing unit 1, the hot water / water mixing unit 1 determines that the solar hot water temperature is lower than the cold water temperature, and the above steps S1 to S3. To execute.
That is, the hot water mixing valve 25 of the hot water mixer 3 is opened to a predetermined set opening degree to preferentially use the hot water of the solar system. Therefore, the low-temperature solar hot water in the solar pipe 56 is taken into the hot / water mixing unit 1 and used for adjusting the mixing of the mixed water.

When all the low-temperature solar hot water in the solar pipe 56 is discharged and the high-temperature solar hot water in the solar water heater 5 is subsequently taken into the hot-water mixing unit 1, the hot-water mixing unit 1 Judges that the solar hot water temperature is higher than the reference temperature (cold water temperature + α), and executes step S5 or step S6 through step S2 and step S4 described above. That is, when the solar hot water temperature is higher than the hot water set temperature, the mixed water having the hot water set temperature is mixed and adjusted, and when the solar hot water temperature is lower than the hot water set temperature, it is calculated from the water heater 7. Adjust the mixing water of the mixing target temperature.

As described above, this hot and cold water mixing unit 1
When the solar hot water temperature is equal to or lower than the reference temperature (cold water temperature + α), the hot water mixing valve 25 of the hot water mixer 3 is always forcibly opened regardless of the target mixing temperature or the set hot water temperature. Since the solar hot water is preferentially used, the solar hot water of the solar water heater 5 can be taken in quickly.
As a result, as described above, even when the hot and cold water mixing unit 1 erroneously recognizes the temperature of the solar hot water, the error can be corrected quickly and appropriate operation control can be performed. Therefore, the solar hot water of the solar water heater 5 can be controlled. Can be effectively used to obtain energy saving benefits.

Further, in the hot and cold water mixing unit 1 of this example, when the temperature of the hot water of the solar is equal to or lower than the reference temperature (cold water temperature + α), the hot water mixing valve 25 changes the flow rate of the hot water of the solar water in the hot water circuit 14 to 14 l / min. The hot water mixing valve 25 is fixed even if the temperature of the hot water of the solar battery suddenly rises during the operation of the solar hot water supply system because the fixed opening is limited to
Can be promptly operated in the valve closing direction and the cold water mixing valve 24 can be operated in the valve opening direction to prevent the temperature of the mixed water from rising sharply. Therefore, the temperature fluctuation of the hot water discharge temperature from the water heater 7 is small, the user feels good and the risk of hot hot water discharge is low.

Further, the reference temperature (cold water temperature + α)
Is set to a temperature higher than the cold water temperature by a temperature α = 3 ° C. which does not impair the user's feeling of use as the temperature fluctuation of the hot water discharged from the water heater 7, so that the hot water of the solar water is preferentially used. By doing so, the hot water discharge temperature of the water heater 7 does not rise significantly, so that the user feels good and the risk of high temperature hot water discharge is low and safe.

Other Embodiments The present invention is not limited to the above embodiments. For example, in the above example, when the solar hot water temperature is equal to or lower than the reference temperature (cold water temperature + α), the hot water mixing valve 25 is fixed to a predetermined set opening degree.
In the case of the above conditions, the operation control of the hot water mixer 3 may be performed so that the hot water mixing valve 25 is fully opened and the cold water mixing valve 24 is fully closed. However, in the case of performing such operation control, it is desirable to use the hot and cold water mixing mixer 3 having a configuration capable of suppressing a rapid rise in the temperature of the mixed water during a rapid rise in the temperature of the solar hot water for the convenience and safety of the user. .

In the above example, the solar water heater 5 is used as the hot water supply device, but the hot water supply device is not limited to this, and other hot water supply devices such as water heaters utilizing various waste heats are used. May be Similarly, the auxiliary heat source device is not limited to the water heater 7 in the above-described example.

The presence / absence and flow rate of the mixed water flowing through the mixed water circuit 29 are detected by the flow rate sensor 32 arranged in the mixed water circuit 29. The value detected by the flow rate sensor disposed inside the unit controller 1 via the cable 77.
It may be received by the communication unit 114 of No. 1 and judged based on the detected value.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an overall configuration of a solar hot water supply system according to an embodiment of the present invention.

FIG. 2 is a flowchart showing an operation of the hot and cold water mixing unit according to the embodiment of the present invention.

[Explanation of symbols]

(1) ・ ・ ・ Hot water mixing unit (11) ・ ・ ・ Unit controller (111) ・ ・ ・ Mixing controller (112) ・ ・ ・ First solar hot water temperature determination unit (113) ・ ・ ・ Second solar hot water temperature determination unit (114) ・ ・ ・ Communication section (14) ・ ・ ・ Hot water circuit (15) ・ ・ ・ Cold water circuit (16) ・ ・ ・ Hot water entrance (17) ・ ・ ・ Water inlet (18) ・ ・ ・ Hot water outlet (19) ・ ・ ・ Hot water temperature sensor (2) ・ ・ ・ Water circuit (23) ・ ・ ・ Cold water temperature sensor (29) ・ ・ ・ Mixed water circuit (3) ・ ・ ・ Hot water mixer (32) ・ ・ ・ Water sensor (33) ・ ・ ・ Mixed water temperature sensor (5) ... Solar water heater (56) ・ ・ ・ Solar hot water piping (7) ・ ・ ・ Water heater (71) ・ ・ ・ Remote control (72) ・ ・ ・ Hot water controller (76) ・ ・ ・ Inlet piping

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Kinji Mori             Rinnai 2-26, Fukuzumi-cho, Nakagawa-ku, Nagoya-shi             Within the corporation (72) Inventor Yukihiro Suzuki             Rinnai 2-26, Fukuzumi-cho, Nakagawa-ku, Nagoya-shi             Within the corporation F term (reference) 3L024 CC05 DD03 DD04 DD22 DD24                       GG03 GG05

Claims (3)

[Claims] 1. A cold water circuit having an upstream end serving as a water inlet connected to a water supply pipe from a water source, and a hot water circuit having an upstream end serving as a hot water inlet connected to a hot water pipe from a hot water supply device,
A water passage circuit comprising a mixed water circuit extending from the confluence point of the cold water circuit and the hot water circuit and having a downstream end serving as a hot water outlet for delivering the mixed water at the confluence point to the auxiliary heat source machine; and the confluence point. In, a hot water mixer for adjusting the mixing ratio of the cold water and the hot water, a cold water temperature sensor for detecting the temperature of cold water flowing through the cold water circuit, a hot water temperature sensor for detecting the temperature of hot water flowing through the hot water circuit, and this hot water mixing unit In a hot and cold water mixing unit including a controller for controlling the operation of the controller, the controller is a reference temperature at which the hot water temperature detected by the hot water temperature sensor is set to be higher than the cold water temperature detected by the cold water temperature sensor by a predetermined temperature. If
The hot and cold water mixing unit comprises mixing control means for operating the hot water side in the valve opening direction in the hot and cold water mixer. 2. The hot and cold water mixing unit according to claim 1, wherein the mixing control means fixes the hot water side of the hot and cold water mixer to a predetermined set opening when the hot water temperature is equal to or lower than the reference temperature. A hot and cold water mixing unit. 3. The hot and cold water mixing unit according to claim 1 or 2, wherein the reference temperature is the temperature difference allowable as a temperature fluctuation of hot and cold water taken out from an auxiliary heat source device connected to the hot and cold water mixing unit. A hot and cold water mixing unit characterized by being set to a temperature higher than the cold water temperature.