JPH0989281A - Solar heat warm water supplier connection unit for hot water supplier - Google Patents

Abstract

PROBLEM TO BE SOLVED: To demonstrate a proper function by connecting a solar heat warm water supplier of an existing hot water supplier by providing a solar heat warm water supplier connection unit at the junction in a water supply circuit or upstream the junction, and further providing a hot water mixer for adjusting a mixing ratio of warm water from the warm water supplier and cold water from the water supply circuit. SOLUTION: In a solar warm water supplier connection unit A for hot water supplier there are formed a warm water passage 13 extending from a warm water piping connection port 15 to a downstream side, and a water supply circuit 10 connected with a hot water supplier connection port 17 after passage through the junction 11 of a cold water passage 14 extending from time downstream side from a water supply piping connection port 16. A warm water amount adjusting valve 21 is disposed on time warm water passage, and a water supply amount adjusting valve 22 is disposed on the other cold water passage 14. A water supply mixture 2 is constructed with both adjusting valves. The warm water amount adjusting valve 21 and the water supply amount adjusting valve 22 are driven with power supply voltage from a power supply circuit 31, and are controlled with a control circuit 35 for monitoring outputs of a temperature sensor 33 and a water flow switch 32.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solar water heater connection unit for a water heater for connecting a solar water heater to an already installed water heater.

[0002]

2. Description of the Related Art There is a water heater connected to a solar water heater from the viewpoint of effectively utilizing energy resources. In this structure, tap water from the water supply circuit and hot water from the solar water heater are mixed in a hot water mixer and then boiled and supplied to the functional unit. And when you set the temperature with the hot water temperature setting device,
The mixing amount ratio of the hot water is adjusted by the hot water mixer so that the set temperature and the temperature of the mixed water become equal, and when the hot water from the solar water heater is lower than the set temperature, this is the boiling water function unit. The temperature is raised to the set temperature.

[0003]

In the above-mentioned water heater, when the temperature of the hot water supplied from the solar water heater is lower than the set temperature, a control program for heating and raising the temperature of the hot water to the set temperature, and a water / water mixer It is necessary to store a control program for controlling the water temperature in the microcomputer in the controller of the water heater body.

Therefore, in the water heater which is premised on the connection of the solar water heater, a special control program considering the use of the solar water heater and a mixing ratio of hot water from the solar water heater and cold water from the cold water circuit are set. It is necessary to manufacture a specially designed water heater that incorporates the hot water mixer to be set, and if the solar water heater is simply connected to the existing water heater having a structure that does not assume the connection of the solar water heater, the solar water heater will be When hot water having a temperature equal to or higher than the set temperature is supplied from the hot water, the hot water is directly supplied to the shower or bathtub for the bathroom, and the hot water temperature adjusting function does not work effectively. Therefore, there is a problem that the solar water heater cannot be properly connected to the existing water heater.

The present application has been made in view of the above points,
The invention of claim 1 provides a connection unit capable of connecting a solar water heater and exerting an appropriate function even in an existing water heater having a structure not premised on the connection of the solar water heater. It is an issue.

[0006]

The invention of claim 1 for solving the above problems will be described with reference to the conceptual diagram shown in FIG.
According to the invention of claim 1, "a water passage circuit (10) connecting from two inlets to a single outlet through a confluence is formed, and one of the inlets is connected to a water supply circuit (61). The water supply pipe connection port (16), the other inlet is the hot water pipe connection port (15) for connecting to the hot water circuit (51) from the solar water heater (5), and the one outlet is hot water supply. A water heater connection port (17) for connecting to the water inlet of the water heater (7), which is provided at the confluence point in the water flow circuit (10) or at its upstream side and from the solar water heater (5). A hot and cold water mixer (2) for adjusting the mixing ratio of the hot water and the cold water from the water supply circuit (61), and a water heater (7)
A mixer control means (3) connected to the output circuit of the hot water temperature setting device (71) provided in is provided, and the mixer control means (3) is
The operation of the hot water / water mixer (2) is controlled so that the set temperature of the hot water temperature setting device (71) and the temperature of the mixed water are made equal ”.

Here, as the mixer control means (3), for example, as in the invention specifying matter of the second aspect of the invention, the "water passage circuit" is used.
By comparing the output of the temperature sensor (33) that detects the temperature of the mixed water downstream of the confluence point in (10) with the set temperature of the hot water temperature setting device (71), the mixed water and the set temperature are made equal. A configuration for controlling the operation of the hot and cold water mixer (2) as described above can be employed.

As the hot water mixer (2), for example, as in the invention specifying matter of claim 3, "a cold water valve port (201) into which cold water from the water supply circuit (61) flows, and a hot water circuit ( Hot water valve inlet (203) into which hot water from
01) A mixing chamber (200) into which water from (203) flows, a heat-sensitive reaction device (26) whose output changes according to the volume change of the thermal expansion material based on the temperature in the mixing chamber (200), and the mixing chamber. The opening degree of the cold water valve opening (201) is increased and the opening degree of the hot water valve opening (203) is increased in association with the output change of the heat sensitive device (26) due to the temperature rise in (200). It is possible to employ an `` automatic mixing valve having a valve body for reducing '', and in such a case, the `` mixer control means (3) '' which is a matter of specifying the invention of the invention concerned, is A device having a function of increasing / decreasing the output of the thermosensitive device (26) so that the temperature in the mixing chamber (200) increases as the temperature rises ”can be adopted as the mixer control means (3).

Next, the operation of the above invention will be described. When connecting the solar water heater to an existing water heater having a structure that does not assume connection of the solar water heater, the water heater (7) is connected via the solar water heater connection unit for a water heater according to the invention of claim 1. To the solar water heater (5). That is, the hot water circuit (51) from the solar water heater (5) is connected to the hot water pipe connection port (15) which is one of the two inflow ports located at the upstream end of the water flow circuit (10). Then, the water supply circuit (61) is connected to the water supply pipe connection port (16) which is the other inflow port. Also, water circuit
The water heater connection port (17), which is the outlet located at the downstream end of (10), is connected to the water inlet of the water heater (7) by piping, and the hot water temperature setting device (71) provided in the existing water heater is 2) Connect the output circuit of 3) and the input part of the mixer control means (3) by wiring.

Next, the hot water supply operation will be described. Water heater
When the shower, hot water tap, water filling valve (valve for filling the bathtub), etc., located downstream of (7) are opened and the hot water supply operation starts, the water flows from the hot water pipe connection port (15). Hot water (hot water from the solar water heater (5)) and water supply connection (16)
Cold water flowing in from (the cold water from the water supply circuit (61)) is mixed in the hot water mixer (2) and then supplied to the water heater (7) via the water heater connection port (17). In this case, the mixer control means (3) connected to the output circuit of the existing hot water temperature setting device (71) provided in the hot water supply device (7) controls the temperature set by the hot water temperature setting device (71). The mixed water (water supply pipe connection port (16) and hot water pipe connection port (1
The operation of the hot water mixer (2) is controlled as follows based on the temperature of the water supplied to the downstream side of the confluence of the two circuits from 5). That is, the mixer control means (3) controls the operation of the hot water mixer (2) so that the set temperature and the temperature of the mixed water are equalized, and thereby hot water at the set temperature is obtained. Adjust the mixing ratio of hot and cold water.

As a result, the mixed water having the temperature set by the hot water temperature setting device (71) is adjusted by the hot water mixer (2) and is supplied to the hot water supply device (7), and the hot water of the set temperature is supplied by the hot water supply device. It is supplied via (7) to the shower, hot water tap, and bathtub. If the hot water supplied from the solar water heater (5) is lower than the temperature set by the hot water temperature setter (71) and the temperature of the mixed water adjusted by the hot water mixer (2) does not reach the set temperature, either. , The water having insufficient temperature (water flowing out of the hot water mixer (2)) is set to the set temperature by the inherent function of the water heater (7) connected to the downstream side of the solar water heater connection unit for hot water heater according to the present invention. It is heated up to.

[0012]

As described above, according to the invention described in claim 1, even if it is an existing water heater having a structure not premised on the connection of the solar water heater, the solar water heater can be connected. It is possible to provide a connection unit capable of exhibiting proper functions.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Next, embodiments of the invention described above will be described. As shown in Fig. 2, in the solar water heater connection unit (A) for the water heater, the hot water passage (13) extending from the hot water pipe connection port (15) to the downstream side and the water supply pipe connection port (16) to the downstream side. Pass the junction (11) of the extended cold water channel (14) and connect the water heater (1
A water circuit (10) connected to 7) is formed, and a hot water flow control valve (21) and the hot water passage (13) connected to the confluence point (11) from the hot water pipe connection port (15) are provided. A check valve (131) on the upstream side is provided, and a water supply amount control valve (2) is installed in the cold water channel (14) connecting from the other water supply pipe connection port (16) to the confluence point (11).
2) and a check valve upstream thereof are provided, and the hot water mixer (2), which is the subject matter of the invention of claim 1, is constituted by the both regulating valves (21) (22). The hot water amount control valve (21) and the water supply amount control valve (22) are driven by the power supply voltage from the power supply circuit (31), and these valves (21) and (22) are connected. It is configured to be controlled by a control circuit (35) that monitors the output of the temperature sensor (33) and the water flow switch (32) provided on the downstream side of the confluence point (11) in the water circuit (10). There is.

The hot water amount control valve (21) and the water supply amount control valve (22)
Is a pulse motor (a) which is driven by the power supply voltage from the power supply circuit (31) and whose operation is controlled by a control signal from the control circuit (35), and the rotation amount of the pulse motor (a). It is composed of a needle valve (b) whose distance from the valve seat opening (c) changes in accordance with the above. It should be noted that two sets of needle valves (b) and (b) that move in and out of the valve seat openings (c) (c) corresponding to the hot water passage (13) and the cold water passage (14) are provided in common (single It may be driven by a pulse motor (a). In this case, by connecting the pulse motor (a) and the needle valve (b) (b) via the gear mechanism, when one needle valve (b) opens, the other needle valve (b) closes. Use a valve-operated structure.

The hot water amount control valve (21) and the water supply amount control valve
The function of the control circuit (35) for controlling (22) will be described in detail after explaining the relationship between the solar water heater connection unit (A) for water heaters and the water heater (7). Next, a solar water heater is connected to the existing water heater (7) having a structure that does not require connection of the solar water heater via the solar water heater connection unit (A) for the water heater.
The work of connecting (5) will be explained.

First, the water heater connection port (17) located at the downstream end of the water flow circuit (10) and the water inlet (73) to the heat exchanger (72) in the water heater (7) are connected. Also, the hot water temperature setting device for the water heater (7)
It is incorporated in the connection terminal (75) for the water heater control circuit (74) to which the output circuit (710) of (71) is connected, and the solar water heater connection unit (A) for the water heater according to the present embodiment. Connection terminal (3 for inputting the set temperature of the control circuit (35)
Wire 51). Further, if the input part of the power supply circuit (70) of the water heater (7) and the power supply circuit (31) of the solar water heater connection unit (A) for the water heater according to the present embodiment are connected by the power supply connection cord (36), Connection with the water heater (7) is complete.

Next, the hot water circuit (51) drawn out from the water supply circuit (61) and the solar water heater (5) is separately connected to the water supply pipe connection port (16) and the hot water pipe connection port (15). Connection work is completed. Next, a control program having the contents shown in FIG. 4 is stored in the microcomputer in the control circuit (35) for controlling the hot water flow control valve (21) and the water supply flow control valve (22) described above. The operation of the solar water heater connection unit (A) for a water heater according to the above embodiment will be described with reference to FIG.

In step (ST1), the output of the water flow switch (32) is monitored. Then, the water filling valve (81) for filling the shower cock (76) and the bathtub (8) is opened to open the shower (77) and the bathtub.
When hot water supply to (8) starts, water flow in the water flow circuit (10) is detected and the water flow switch (32) outputs an ON signal. In this case, the mixed water flowing out from the hot water mixer (2) In step (ST2), the temperature detected by the temperature sensor (33), which is the temperature of, and the set temperature of the hot water temperature setting device (71) are compared. When the temperature of the mixed water is lower than the set temperature, increase the mixing amount of the hot water supplied from the solar water heater (5) or mix the cold water supplied from the water supply circuit (61). The control to reduce the amount is executed in steps (ST4) to (ST6). That is, if it is confirmed in step (ST3) that the hot water flow control valve (21) is not in the fully opened state, the opening degree of the hot water flow control valve (21) is changed to one level (for example, the maximum opening) in step (ST4). After increasing by 1/10), the control operation is returned to step (ST1) again. On the other hand, when step (ST3) is executed, the hot water flow control valve (21)
When is fully open, further judge the opening of the water supply control valve (22) in step (ST5), and if it is not fully closed, open the opening of the water supply control valve (22) by 1 After narrowing down the level (for example, 1/10 of the maximum opening) (step (ST6)),
Return control operation to step (ST1).

On the other hand, if the temperature of the mixed water flowing out from the hot water mixer (2) is not lower than the set temperature of the hot water temperature setting device (71), the control operation branches from step (ST2) to step (ST7). In step (ST7), it is further determined whether or not the temperature of the mixed water (the temperature detected by the temperature sensor (33)) is higher than the set temperature. Then, when the temperature of the mixed water is higher than the set temperature, control is performed to decrease the mixing amount of hot water from the solar water heater (5) or increase the mixing amount of cold water from the water supply circuit (61) (ST8). ) To (ST11). That is, if it is confirmed in step (ST8) that the hot water flow control valve (21) is not fully closed, the opening degree of the hot water flow control valve (21) is lowered by one level in step (ST9), and then the control operation is performed. The step
Return to (ST1). On the other hand, in step (ST8), the hot water flow control valve (2
If it is confirmed that (1) is fully closed, step (ST1
(0) determines the opening of the water supply control valve (22), and if it is not in the fully open state, increase the opening of the water supply control valve (22) by one level and then control to step (ST1) To return.

As described above, according to the above-described embodiment, the hot water from the solar water heater (5) and the cold water from the water supply circuit (61) are mixed in the hot and cold water mixer (2) to adjust the hot water. The hot water of the temperature set by the temperature setting device (71) is controlled to flow out from the solar water heater connection unit (A) for water heaters. still,
In the above embodiment, the combination of the control circuit (35) for controlling the hot and cold water mixer (2) and the temperature sensor (33) connected to the control circuit (35) is the mixer control means which is the invention specifying matter of the invention of claim 1.
It corresponds to (3).

When the temperature of the hot water supplied from the solar water heater (5) is lower than the set temperature of the hot water temperature setter (71), steps (ST1) to (ST6) are repeatedly executed, Finally, the water supply amount control valve (22) is fully closed and the warm water amount control valve (21) is fully opened. Even in this final state, the temperature detected by the temperature sensor (33) is the hot water temperature setting device (7
When the temperature becomes lower than the set temperature of 1), the gas burner (78) of the water heater (7) burns and the mixed water in a temperature insufficient state is heated and heated in the heat exchanger (72). That is, in the water heater (7), the hot water temperature detected by the hot water temperature sensor (79) arranged downstream of the heat exchanger (72) is the temperature set by the hot water temperature setter (71). Since the water heater control circuit (74) of the water heater (7) controls the combustion amount of the gas burner (78) so that it becomes equal to, the mixed water is heated up to the set temperature by the function of the water heater (7). It is heated and the hot water of that temperature is sent to the shower (77) and the bathtub (8).

In the above embodiment, the shower cock is used.
(76) and water flow switch to detect opening of the water filling valve (81)
Although (32) is provided in the solar water heater connection unit (A) for a water heater, the signal of the water flow switch (89) inserted in the water passage circuit of the water heater (7) may be used. In this case, the signal of the water flow switch (89) is taken out from the water flow switch input terminal (741) in the water heater control circuit (74) to control the solar water heater connection unit (A) for the water heater according to the present embodiment. Apply to input terminal (350) of circuit (35). That is, the terminals (741) (350) are connected by wiring. in this case,
The water flow switch (32) in this unit is unnecessary, and the number of required parts can be reduced. In the above embodiment, the power supply connection cord (36) of the solar water heater connection unit (A) for the water heater is connected to the input part of the power supply circuit of the water heater (7). (7) Power plug (P)
Alternatively, a power plug independent of the above may be provided, and electricity may be supplied from the power plug to the power circuit (31).

In the above embodiment, the hot water flow control valve (2
1) is provided in the hot water passage (13) and the water supply amount control valve (22) is provided in the cold water passage (14) to control each of these valves (21) (22).
As shown in, a hot and cold water mixer (2) having a single valve body (2b) may be provided at the confluence (11) of the hot water passage (13) and the cold water passage (14). In this case, as shown in the figure, two inlets (2b ₁ )
A rotary valve (2b) equipped with (2b ₂ ) and one outlet (2b ₃ ) is loaded in the valve casing (2a), and the rotary angle of the rotary valve (2b) is controlled by a pulse motor (not shown). By rotating the hot water circuit (1
Adjust the mixing ratio of hot water from 3) (hot water from the solar water heater (5)) and cold water from the water supply circuit (14) (tap water from the water pipe). The specific control operation for mixing hot and cold water is shown in FIG.
Is shown in the flowchart. That is, step (ST2
When the ON signal of the water flow switch (32) is confirmed in (0), the temperature of the mixed water (detected temperature of the temperature sensor (33)) is compared with the set temperature in step (ST21), and the temperature of the mixed water is set to the set temperature. If it is higher, the mixing ratio of warm water is reduced in step (ST23). That is, the rotary valve (2b) is rotated by a pulse motor (not shown) so that the opening degree of the hot water valve opening (13a) becomes small. On the contrary, when the temperature of the mixed water is lower than the set temperature, the mixing ratio of the hot water is increased in step (ST22) (the rotating valve (2b) is rotated in the opposite direction to the high temperature). When the hot water mixer (2) of FIG. 5 is used, the water flow switch (8) incorporated in the hot water heater (7) is also used as described above.
By using the output of 9), the water flow switch (32) of the solar water heater connection unit (A) for a water heater may be omitted.

The second embodiment shown in FIG. 7 is the hot water passage (13) from the hot water pipe connection port (15) and the water supply pipe connection port (16).
And an automatic mixing valve disposed at the confluence point (11) where the cold water channel (14) joins is adopted as the hot and cold water mixer (2), and the automatic mixing valve is, for example, the one in Japanese Utility Model No. 63-2705. It has been known. That is, the mixing chamber
The (200) is provided with a cold water valve body (202) for adjusting the opening degree of the cold water valve opening (201) and a hot water valve body (204) for adjusting the opening degree of the hot water valve opening (203). In addition, both of these valve bodies (202)
(204) (the set of these two valve bodies (202) and (204) corresponds to the valve body which is the subject matter of the invention of claim 3) is integrally connected so as to move up and down. Then, both valve bodies (2
02) and (204) are heat-sensitive devices (2
While being fixed to 6), the output shaft (261) of the heat sensitive device (26) is in contact with the temperature adjusting screw (27) screwed into the upper part of the hot water mixer (2). And the temperature adjusting screw (27)
The amount of screwing is adjusted by a pulse motor (29) that can rotate in the forward and reverse directions.The pulse motor (29) is the output of the hot water temperature setting device (71) provided in the existing water heater. The operation is controlled by the control circuit (35) for judging the above. Further, the output of the water flow switch (32) arranged in the vicinity of the water heater connection port (17) formed at the downstream end of the hot water mixer (2) has the same control circuit (35) as in the above-described embodiment. Is being applied to.

In this case, the rotation amount (rotation amount from the reference position) of the pulse motor (29) to be rotated corresponding to the set temperature of the hot water temperature setting device (71) is stored in the memory of the control circuit (35) in advance. It is stored in the hot water temperature setting device (7
The screwing amount of the temperature adjusting screw (27) is changed according to the set temperature of 1). As a result, the set temperature of the hot water temperature setting device (71) is converted into the screw-in amount of the temperature adjusting screw (27), which is then projected by the output shaft (261) of the heat-responsive device (26) (heat-sensitive device). The output of the response device (26)).
That is, the heat sensitive device (26) is further added by the screwing amount of the temperature adjusting screw (27) corresponding to the set temperature of the hot water temperature setting device (71) from the protruding amount of the output of the output shaft (261). It is moved to the lower side, and the output of the heat sensitive device (26) (the vertical position of the heat sensitive device (26) that changes according to the protrusion amount of the output shaft (261)) of the hot water temperature setting device (71). Increases or decreases according to the set temperature. Therefore, in this embodiment, the hot water temperature setting device (7
The combination of the control circuit (35) that determines the output of 1), the pulse motor (29) driven by this, and the temperature adjusting screw (27) controls the automatic mixing valve that is the hot and cold water mixer (2). It corresponds to the mixer control means (3) which is the matter specifying the invention of claim 3 of the invention. Then, as the set temperature of the hot water temperature setting device (71) becomes lower, the temperature adjusting screw
The rotation amount of the pulse motor (29) is set so that the screwing amount of (27) becomes large. When the screwing amount of the temperature adjusting screw (27) into the hot and cold water mixer (2) becomes large, the downward movement amount of the cold water valve body (202) and the hot water valve body (204) together with the heat sensitive device (26) becomes large. As a result, the cold water valve opening (20
The opening degree of 1) increases and the opening degree of the hot water valve opening (203) decreases. Therefore, when the set temperature of the hot water temperature setting device (71) is low, the amount of cold water flowing in from the cold water valve opening (201) with a large opening is larger than the amount of hot water flowing in from the other hot water valve opening (203). The temperature of the mixed water becomes low, and the temperature of the mixed water becomes low. Then, in accordance with the set temperature of the hot water temperature setting device (71), the cold water valve opening (201) and the hot water valve opening (203) are supplied from the hot water piping connection port (15) in a state where they are maintained at a predetermined opening. When the temperature of the hot water that is generated rises and the temperature inside the mixing chamber (200) also rises, the thermal expansion material such as thermowax filled in the heat sensitive device (26) thermally expands and the output shaft (261) protrudes. Volume, which increases the opening of the cold water valve opening (201) while increasing the hot water valve opening (201).
The opening of 3) decreases. Therefore, when the temperature of the hot water from the hot water pipe connection port (15) rises, the mixing ratio of the cold water increases, whereby the temperature of the mixed water is maintained at the set temperature. On the contrary, hot water piping connection (15)
As the temperature of the hot water supplied from the mixing chamber decreases (200)
When the temperature decreases, the amount of protrusion of the output shaft (261) becomes shorter, so the urging force of the spring (28) causes the cold water valve body (202) and the hot water valve body (204) to move upward, which causes The opening degree of the cold water valve opening (201) decreases, while the opening degree of the hot water valve opening (203) increases. Therefore, when the temperature of the hot water from the hot water pipe connection port (15) decreases, the mixing ratio of the hot water increases and the temperature of the mixed water is maintained at the set temperature.

When the set temperature of the hot water temperature setting device (71) is high, the screwing amount of the temperature adjusting screw (27) by the pulse motor (29) becomes smaller than that when the set temperature is low. It is set. As a result, the opening of the cold water valve opening (201) becomes smaller, the opening of the hot water valve opening (203) becomes larger, and the temperature of the mixed water becomes higher.
When the temperature of the hot water flowing in from 5) changes, the amount of protrusion of the output shaft (261) changes in the same manner as above depending on the temperature change, which sets the temperature of the mixed water in the mixing chamber (200). Maintained at temperature.

In the second embodiment, the output of the water flow switch (89) incorporated in the water heater (7) is used as in the first embodiment. Therefore, the water flow switch (32) of the solar water heater connection unit (A) for a water heater may be omitted.

[Brief description of drawings]

FIG. 1 is a conceptual diagram of the invention of claim 1.

FIG. 2 is an explanatory diagram of the first embodiment.

FIG. 3 is a configuration diagram of a hot water amount control valve (21) and a water supply amount control valve (22).

FIG. 4 is a control flowchart of the first embodiment.

FIG. 5 is an explanatory view of main parts showing a modified example of the hot water mixer (2).

FIG. 6 is a control flowchart when the hot water mixer (2) of FIG. 5 is used.

FIG. 7 is an explanatory view of a main part of the second embodiment.

[Explanation of symbols]

 (2) ・ ・ ・ Hot water mixer (3) ・ ・ ・ Mixer control means (5) ・ ・ ・ Solar water heater (7) ・ ・ ・ Hot water heater (10) ・ ・ ・ Water passage (26) ・ ・ ・Thermosensitive device (33) ・ ・ ・ Temperature sensor (51) ・ ・ ・ Hot water circuit (61) ・ ・ ・ Water supply circuit (71) ・ ・ ・ Hot water temperature setting device (200) ・ ・ ・ Mixing chamber (201) ・ ・・ Cold water valve (203) ・ ・ ・ Hot water valve

Claims (3)

[Claims] 1. A water supply pipe connection for forming a water passage circuit (10) from two inlets through a confluence to one outlet and connecting one of the inlets with a water supply circuit (61). mouth
(16), the other inlet is the hot water pipe connection port (15) for connecting to the hot water circuit (51) from the solar water heater (5), and the one outlet is the water heater (7) The water heater connection port (17) for connecting to the water inlet of, and the hot water from the solar water heater (5) and the hot water provided at the confluence point in the water flow circuit (10) or at the upstream side thereof. Hot and cold water mixer that adjusts the mixing ratio of cold water from the water supply circuit (61)
(2) and mixer control means (3) connected to the output circuit of the hot water temperature setting device (71) provided in the water heater (7), wherein the mixer control means (3) is the hot water A solar water heater connection unit for a water heater, which is configured to control the operation of the hot water mixer (2) so that the set temperature of the temperature setting device (71) and the temperature of the mixed water become equal. 2. The mixer control means (3) outputs the temperature sensor (33) for detecting the temperature of the mixed water downstream of the confluence point in the water flow circuit (10) and the hot water temperature setter (71). The operation of the hot and cold water mixer (2) is controlled so that the set temperature is made equal to that of the mixed water by comparing the set temperatures of 1.
Solar water heater connection unit for water heater. 3. A cold water valve opening (201) into which cold water from a water supply circuit (61) flows, a hot water valve opening (203) into which hot water from a hot water circuit (51) flows, and both valve openings ( 201) A mixing chamber (200) into which water from (203) flows, a heat-sensitive reaction device (26) whose output changes according to the volume change of the thermal expansion material based on the temperature in the mixing chamber (200), and the mixing chamber. The opening degree of the cold water valve opening (201) is increased in conjunction with a change in the output of the heat sensitive device (26) due to the temperature rise in the (200) and the hot water valve opening (20).
An automatic mixing valve equipped with a valve element that reduces the opening degree of 3) is adopted as the hot and cold water mixer (2), and the mixer control means (3) controls the hot water temperature setting device (71) as the set temperature increases. The solar water heater connection unit for a water heater according to claim 1, further comprising a function of increasing or decreasing the output of the heat sensitive device (26) so that the temperature in the mixing chamber (200) becomes high.