JP5980176B2 - Instant hot water supply system - Google Patents

Description

  The present invention relates to an immediate hot water supply system having a function of supplying hot water immediately when a tap is opened.

  Conventionally, a plurality of water heaters for heating the hot water flowing through the forward pipe are connected in the middle of the outgoing pipe whose one end is connected to the water supply and the other end is connected to the hot water tap, and these hot water heaters are bypassed. An immediate hot water supply system is known that includes a return pipe that communicates an outgoing pipe and a circulation pump that circulates hot water in a circulation circuit including the outgoing pipe and the return pipe (see, for example, Patent Document 1).

  In the instant hot water supply system described in Patent Document 1, when the hot water tap is closed and the hot water supply is stopped, the hot water flowing through the water heater is operated while circulating the hot water in the circulation circuit by operating the circulation pump. Circulating heat insulation operation is performed to heat the As described above, the hot water in the circulation circuit is maintained in the vicinity of the set temperature by performing the circulating heat insulation operation, so that the hot water is immediately supplied from the hot water tap when the user opens the hot water tap.

  In the instant hot water supply system, the circulation pump is stopped when hot water is supplied from the tap (when hot water is supplied). Therefore, in order to detect that the hot water supply state has been reached, a first flow rate sensor that detects the flow rate of hot water flowing through the forward pipe, a second flow rate sensor that detects the flow rate of hot water flowing through the return pipe, the water supply pipe and the return pipe And a third temperature sensor provided at a junction with the pipe.

  And (a) when the detected temperature of the third temperature sensor rapidly decreases, and (b) when the difference between the detected flow rate of the first flow rate sensor and the detected flow rate of the second flow rate sensor becomes equal to or higher than a predetermined flow rate. The circulation pump is stopped.

Japanese Patent Application Laid-Open No. 2004-286397

  As described above, in the conventional immediate hot water supply system, the operation of the circulation pump is generally stopped when the hot water supply state is set. And in order to detect that it is a hot-water supply state, like the said immediate hot-water supply system, the 2nd flow sensor which detects the flow volume of the hot water which flows through a return pipe, and the 3rd provided in the junction of a return pipe and a water supply pipe When the temperature sensor is provided exclusively, there is an inconvenience that the configuration of the system becomes complicated and the cost of the system increases due to an increase in the number of components.

  The present invention has been made in view of such a background, and an object thereof is to provide an immediate hot water supply system capable of detecting the hot water supply state without providing a dedicated sensor.

The present invention has been made to achieve the above object, and the instant hot water supply system of the present invention includes:
A first forward pipe having one end connected to the water supply and the other end connected to a tap;
A return pipe communicating between one end and the other end of the first forward pipe;
Circulation connected to the middle of the first forward pipe for circulating hot water in a circulation circuit comprising a first heating section for heating the hot water flowing through the first forward pipe, and the first forward pipe and the return pipe. A first water heater comprising a pump;
A second forward pipe communicating with the upstream side and the downstream side of the first hot water heater of the first forward pipe;
A second heating unit connected in the middle of the second forward pipe for heating the hot water flowing through the second forward pipe; and a second flow rate sensor for detecting a flow rate of hot water flowing from the second forward pipe. A second water heater provided,
A check valve that allows water to flow from the second forward pipe to the second hot water heater and disables water from the second hot water heater to the second forward pipe;
When the detected flow rate of the second flow rate sensor is less than a predetermined hot water supply detection flow rate, a circulation heat retention operation for operating the first heating unit is performed in a state where the circulation pump is operated, and the second flow rate sensor When the detected flow rate is equal to or higher than the detected hot water supply flow rate, a control for executing a hot water supply operation for operating at least one of the first heating unit and the second heating unit with the circulation pump stopped. And a section.

  According to the present invention, when the circulation heat insulation operation is being performed, the second water heater is not sucked into the second heating unit by the circulation pump, and the check valve Thus, the inflow of hot water into the second water heater from the downstream side of the second forward pipe is prohibited. Therefore, if the hot-water tap is closed, the detection flow rate of the second flow rate sensor is less than the hot water supply detection flow rate.

Then, when the hot-water tap is opened, hot water flows from the second forward pipe to the hot-water tap through the second hot water supply device, so that the detected flow rate of the second flow sensor is the hot water supply. Over the detected flow rate. Therefore, when the detected flow rate of the second flow sensor becomes equal to or higher than the hot water supply detection flow rate during execution of the circulating heat insulation operation, it can be determined that the hot water tap has been opened and the hot water supply state has been entered.

  The second flow rate sensor is generally provided to prohibit heating by the second heating unit in a state where hot water is not circulating in the second water heater. Therefore, it is possible to detect the hot water supply state without providing a dedicated sensor and execute the hot water supply operation by the control unit.

Further, the second water heater is capable of passing water from the second forward pipe to the second heating part, and cannot pass water from the second forward pipe to the second heating part. Provided with a second water flow switching valve for switching between a state where water flow is impossible,
A plurality of second hot water supply units having the second water heater and the second forward pipe;
The controller is configured to allow at least one of the plurality of second water heaters to pass through the second water flow switching valve, to perform the circulation heat insulation operation, and during the execution of the circulation heat insulation operation, When the detected flow rate of the second flow rate sensor of the second water heater that is in a water flowable state becomes equal to or higher than the detected hot water flow rate, the circulating heat insulation operation is terminated and the hot water supply operation is executed.
During execution of the hot water supply operation, the number of second water heaters that are allowed to pass water is changed according to the total amount of flow detected by the second flow rate sensor of the second water heater that is allowed to pass water. It is characterized by that.

  According to this configuration, during execution of the hot water supply operation, the second hot water supply that is allowed to pass water according to the total amount of flow detected by the second flow rate sensor of the second water heater that is allowed to pass water. By changing the number of units, an efficient hot water supply operation can be performed according to the hot water flow rate.

The first water heater is capable of passing water from a first flow rate sensor that detects a flow rate of hot water flowing from the first forward pipe and from the first forward pipe to the first heating unit. A first water flow switching valve that switches between a state and a water impermeable state in which water cannot be passed from the first forward pipe to the first heating unit,
A plurality of first hot water supply units having the first water heater and the first forward pipe;
The control unit is configured to allow water to flow in accordance with a total amount of flow detected by the first flow rate sensor of the first water heater that is in a water flowable state during execution of the hot water supply operation. The number of units is changed.

  According to this configuration, during the execution of the hot water supply operation, the first hot water supply that is allowed to pass water according to the total amount of flow detected by the first flow rate sensor of the first water heater that is in a water flow enabled state. By changing the number of units, an efficient hot water supply operation can be performed according to the hot water flow rate.

The block diagram of an immediate hot water supply system (circulation heat insulation operation state). The block diagram of a hot water supply system (hot water supply operation state). Flowchart of circulating heat insulation operation. The flowchart of a hot water supply driving | operation. Explanatory drawing of the priority of each water heater.

  An embodiment of the present invention will be described with reference to FIGS. Referring to FIG. 1, an immediate hot water supply system 1 of the present embodiment is a connected hot water supply type, and includes five water heaters 10, 20, 30, 40, 50 and each water heater 10, 20, 30, 40, 50. And a remote controller 70 communicatively connected to the connection controller 60.

  Further, the immediate hot water supply system 1 includes a first outgoing pipe 2 whose one end is connected to the water supply and the other end is connected to the hot water tap 9, and a connection place between the hot water tap 9 of the first outgoing pipe 2 and the first outgoing line. A return pipe 4 communicating between the connection points of the pipe 2 and the water supply, and a return pipe provided on the return pipe 4 to allow water to pass from the return pipe 4 to the first forward pipe 2 and from the first forward pipe 2 to the return pipe 4 is provided with a check valve 5 that disables water flow to 4.

  The water heater 10 adjusts the opening degree of the first heat exchanger 11 connected in the middle of the first forward pipe 2, the first burner 12 that heats the first heat exchanger 11, and the first forward pipe 2. A first water quantity servo 13 (including the function of the first water flow switching valve of the present invention), a first flow rate sensor 14 for detecting the flow rate of hot water supplied from the first forward pipe 2, and the first forward pipe 2 A first temperature sensor 15 that detects the temperature of the flowing hot water, a circulation pump 16 that sucks hot water from the first forward pipe 2 and circulates the hot water in the circulation circuit composed of the first forward pipe 2 and the return pipe 4; And a first hot water controller 17 for controlling the operation of the water heater 10.

  The first heat exchanger 11 and the first burner 12 constitute a first heating unit of the present invention. The first hot water controller 17 is an electronic circuit unit configured by a CPU, a memory, and the like (not shown). The CPU operates a control program for the hot water heater 10 held in the memory, thereby operating the hot water heater 10. It fulfills the function of controlling. The first forward pipe 2 and the hot water heater 10 constitute a first hot water supply unit of the present invention.

  The water heater 20 is connected to a branch pipe 29 that branches from the first forward pipe 2 and communicates the upstream side and the downstream side of the water heater 10. As with the water heater 10, the water heater 20 includes a first heat exchanger 21, a first burner 22, a first water amount servo 23 (including the function of the first water flow switching valve of the present invention), a first A flow rate sensor 24, a first temperature sensor 25, a circulation pump 26, and a hot water supply controller 27 are provided.

  The first heat exchanger 21 and the first burner 22 constitute the first heating unit of the present invention. The hot water controller 27 is an electronic circuit unit configured by a CPU, a memory, and the like (not shown), and controls the operation of the water heater 20 by executing a control program for the water heater 20 held in the memory by the CPU. Fulfills the function of Further, the branch pipe 29 (corresponding to the first forward pipe of the present invention) and the water heater 10 constitute the first hot water supply unit of the present invention.

  In the following, the water heaters 10 and 20 provided with the circulation pumps 16 and 26 are referred to as P water heaters (water heaters with pumps, corresponding to the first water heater of the present invention) 10 and 20, respectively.

Next, the water heater 30 is branched from the first forward pipe 2 and connected to the middle of the second forward pipe 3 that communicates the upstream side and the downstream side of the P water heaters 10 and 20. The water heater 30 includes a second heat exchanger 31 connected in the middle of the second forward pipe 3, a second burner 32 for heating the second heat exchanger 31, and a second forward pipe for changing the opening degree of the second forward pipe. 2-water quantity servo 33 (including the function of the second water flow switching valve of the present invention), a second flow rate sensor 34 for detecting the flow rate of hot water flowing in from the second forward pipe 3, and the second forward pipe 3 flowing out. A second temperature sensor 35 that detects the temperature of the hot water and a second hot water controller 37 that controls the operation of the water heater 30 are provided. The second forward pipe 3 is provided with a check valve 6 that allows water flow from the second forward pipe 3 to the hot water heater 30 and disables water flow from the hot water heater 30 to the second forward pipe 3. It has been.

  The second heat exchanger 31 and the second burner 32 constitute a second heating unit of the present invention. The second hot water controller 37 is an electronic circuit unit that includes a CPU, a memory, and the like (not shown), and controls the operation of the water heater 30 by executing a control program for the water heater 30 held in the memory. Fulfills the function of The second forward pipe 3 and the hot water heater 30 constitute a second hot water supply unit of the present invention.

  The water heater 40 is connected in the middle of a branch pipe 49 that branches from the second forward pipe 3 and communicates the upstream side and the downstream side of the water heater 30. As with the water heater 30, the water heater 40 includes a second heat exchanger 41, a second burner 42, a second water quantity servo 43 (including the function of the second water flow switching valve of the present invention), a second A flow sensor 44, a second temperature sensor 45, and a second hot water controller 47 are provided.

  In addition, the 2nd heat exchanger 41 and the 2nd burner 42 comprise the 2nd heating part of this invention. The second hot water controller 47 is an electronic circuit unit configured with a CPU, a memory, and the like (not shown), and controls the operation of the hot water heater 40 by executing a control program for the hot water heater 40 held in the memory. Fulfills the function of Further, the branch pipe 49 (corresponding to the second forward pipe of the present invention) and the water heater 40 constitute a second hot water supply unit of the present invention.

  The water heater 50 is connected to a branch pipe 59 that branches from the second forward pipe 3 and communicates the upstream side and the downstream side of the water heaters 30 and 40. Similarly to the water heaters 30 and 40, the water heater 50 includes a second heat exchanger 51, a second burner 52, a second water amount servo 53 (including the function of the second water flow switching valve of the present invention), A second flow rate sensor 54, a second temperature sensor 55, and a hot water supply controller 57 are provided.

  The second heat exchanger 51 and the second burner 52 constitute a second heating unit of the present invention. The hot water controller 57 is an electronic circuit unit configured by a CPU, a memory, and the like (not shown), and functions to control the operation of the water heater 50 by executing a control program for the water heater 50 held in the memory. Fulfill. Further, the branch pipe 59 (corresponding to the second forward pipe of the present invention) and the water heater 50 constitute the second hot water supply unit of the present invention.

  Hereinafter, the water heaters 30, 40, and 50 that are not provided with the circulation pump are referred to as N water heaters (no-pump water heaters, corresponding to the second water heater of the present invention) 30, 40, and 50.

  The connection controller 60 is an electronic circuit unit including a CPU, a memory, and the like (not shown). The first hot water controller 17, 27 and the second hot water controller 37, 47, 57 of each hot water heater 10, 20, 30, 40, 50. Are communicated with each other to detect the operation of each water heater 10, 20, 30, 40, 50 and the state of each water heater 10, 20, 30, 40, 50.

  A remote controller 70 is connected to the connection controller 60, and the user operates the remote controller 70, so that the temperature of the hot water supplied from the hot water tap 9 (target hot water supply temperature) and the time zone during which the circulation heat insulation operation is performed (circulation) It is possible to set a heat retention time zone).

  Hereinafter, in accordance with the flowcharts shown in FIGS. 3 to 4, the execution procedure of the “circulation heat insulation operation” and the “hot water supply operation” by the connection controller 60 will be described. In addition, the structure in which the connection controller 60 performs the “circulation heat insulation operation” and the “hot water supply operation” corresponds to the control unit of the present invention.

  FIG. 3 is a flowchart of the “circulation heat retention operation”. The connection controller 60 sets the priority of each water heater 10, 20, 30, 40, 50 for circulation heat insulation operation in STEP1. The connection controller 60 sets the priority of each water heater 10, 20, 30, 40, 50 according to the setting table shown in FIG.

  As shown in FIG. 5A, in this embodiment, the connection connector No. 1-No. No. 5, no. 4 is connected to the P water heater 10. 5 is connected to the P water heater 20. 1 is connected to the N water heater 30. 2 is connected to an N water heater 40, 3 is connected to an N water heater 50.

  Then, according to the setting table of FIG. 5A, the connection controller 60 sets the priority order during the hot water supply operation in the order of P water heater 10 → P water heater 20 → N water heater 30 → N water heater 40 → N water heater 50. The priority is set in the order of increasing (priority for hot water supply operation).

  Moreover, the connection controller 60 sets the priority order in the order of the P water heaters 10, 20 → N water heater 30 → N water heater 40 → N water heater 50 in the order of circulation heat insulation operation (circulation heat insulation). Driving priority). In this case, the P water heaters 10 and 20 have the same priority.

  In subsequent STEP 2, the connection controller 60 transmits a control for instructing the valve opening of the first water quantity servos 13 and 23 for the P water heaters 10 and 20 according to the priority order. Furthermore, the connection controller 60 transmits a control signal that instructs the N water heaters 40 and 50 to close the second water amount servos 43 and 53.

Thereby, as shown in FIG.1 and FIG.5 (a), about the P water heaters 10 and 11 and the N water heater 30, the 1st water quantity servos 13 and 23 and the 2nd water quantity servo 33 have opened the valve ( passing water state, it becomes to have) indicated by open triangle in FIGS. Further, the N water heaters 40 and 50 are in a state in which the second water quantity servos 43 and 53 are closed (in a state where water cannot pass, which are indicated by black triangles in FIGS. 1 and 2 ).

  In the next STEP 3, the connection controller 60 transmits a control signal instructing the start of circulation to the first hot water supply controllers 17 and 27 of the P water heaters 10 and 20. The first hot water supply controllers 17 and 27 that have received this control signal start the operation of the circulation pumps 16 and 26, and as a result, as shown in FIG. 1, the first forward pipe 2, the branch pipe 29 and the return pipe 4. Circulation of hot water in the circulation circuit consisting of

When the detected flow rate of the first flow sensor 14 is equal to or higher than the detected hot water supply flow rate (ignition flow rate), the first hot water controller 17 controls the first burner 12 so that the detected temperature of the first temperature sensor 15 becomes the target hot water temperature. Control the firepower. Similarly, the hot water controller 27 controls the heating power of the first burner 22 so that the detected temperature of the first temperature sensor 25 becomes the target hot water temperature when the detected flow rate of the first flow sensor 24 is equal to or higher than the detected hot water flow rate. Control.

  As a result, the “circulation heat insulation operation” is started in which hot water in the circulation circuit composed of the first forward pipe 2 and the branch pipe 29 and the return pipe 4 is circulated while being heated by the P water heaters 10 and 20.

  In the next STEP 4, the connection controller 60 sends a flow sensor (first flow rate) to the first hot water controller 17, 27 and the second hot water controller 37, 47, 57 of each hot water heater 10, 20, 30, 40, 50. A control signal requesting data transmission of the detected flow rate of the sensors 14, 24 and the second flow rate sensors 34, 44, 54) is transmitted. And the data of the detected flow volume of the flow sensor (1st flow sensor 14, 24, 2nd flow sensor 34, 44, 54) is received from the 1st hot water controller 17,27 and the 2nd hot water controller 37,47,57. .

  In subsequent STEP 5, the connection controller 60 determines whether or not the circulation heat insulation condition is satisfied during the execution of the “circulation heat insulation operation”. As the circulation heat insulation condition, it is set that at least one of the following two conditions is satisfied.

(A) It is a circulation heat insulation time zone set by the remote controller 70.
(B) An operation to start circulating heat insulation was performed by the remote controller 70.

  When the circulation heat insulation condition is established, the process proceeds to STEP 6 and the connection controller 60 determines whether or not the detected flow rate of the second flow rate sensor 34 of the N water heater 30 is equal to or higher than the detected hot water flow rate.

  In STEP 6, when the detected flow rate of the second flow rate sensor 34 is less than the hot water supply detection flow rate, the hot water tap 9 is closed because no hot water is flowing from the second forward pipe 3 into the N water heater 30. Can be determined. Therefore, in this case, the process returns to STEP 5 and the connection controller 60 continues the control of the “circulation heat insulation operation”.

  On the other hand, when the detected flow rate of the second flow rate sensor 34 is equal to or higher than the hot water supply detection flow rate in STEP 6, hot water is flowing from the second forward pipe 3 into the N water heater 30, so that the hot water tap 9 is opened. Can be determined.

  Therefore, in this case, the process proceeds to STEP 7, and the connection controller 60 instructs the first hot water controller 17 of the P water heater 10 and the first hot water controller 27 of the P water heater 20 to stop the circulation pumps 16 and 26. A signal is transmitted to stop the circulation pumps 16 and 26.

  In subsequent STEP 8, the connection controller 60 sets the priority order of the water heaters 10, 20, 30, 40, 50 to the priority order for the hot water supply operation shown in FIG. In the next STEP 9, the connection controller 60 transmits a signal instructing the valve opening of the first water quantity servo 13 to the first hot water supply controller 17 of the P water heater 10 having the highest priority according to the priority order. A control signal instructing the valve closing of the water amount servos 23, 33, 43, 53 is transmitted to the first hot water controller 27 and the second hot water controllers 37, 47, 57 of the hot water heaters 20, 30, 40, 50. To do.

  As a result, only the first water amount servo 13 of the P water heater 10 is opened, and the water amount servos 23, 33, 43, 53 of the other water heaters 20, 30, 40, 50 are closed. Then, proceeding to STEP 9, the connection controller 60 shifts from “circulation heat insulation operation” to “hot water supply operation” control.

  Further, even when the circulation heat insulation operation is not established in STEP 5, the process branches to STEP 7, and the connection controller 60 shifts from “circulation heat insulation operation” to “hot water supply operation” control.

  Next, referring to FIG. 4, the execution procedure of the “hot water supply operation” by the connection controller 60 will be described.

  In STEP 20 of FIG. 4, the water amount servo (the first water amount servo 13, the first water amount servo 13, the first hot water controller 17, 27 of the P water heaters 10, 20 of priority 1 to the second hot water controller 37 of the N water heater 30 is selected. 23, a second water amount servo 33) is transmitted, and a water amount servo (second water amount servo 43) is transmitted to the second hot water controllers 47 and 57 of the P water heaters 40 and 50 having the priorities 4 to 5. , 53) is transmitted. As a result, as shown in FIG. 2, the first water amount servos 13 and 23 of the P water heaters 10 and 20 and the second water amount servo 33 of the N water heater 30 are opened, and the second water amount servos 33 of the P water heaters 40 and 50 are opened. The water quantity servos 43 and 53 are closed.

  In FIG. 2, the first water volume servos 13 and 23 and the second water volume servo 33 in the valve open state are represented by white triangles, and the second water volume servos 43 and 53 in the valve closed state are represented by black triangles. Yes. In the state of FIG. 2, hot water heated by the first heat exchangers 11, 21 of the P water heaters 10, 20 and the second heat exchanger 31 of the N water heater 30 is supplied from the hot water tap 9.

  In subsequent STEP 21, the connection controller 60 detects the first flow rate sensor for the first hot water controller 17, 27 and the second hot water controller 37, 47, 57 of the P water heater 10, 20 and the N water heater 30, 40, 50. 14 and 24 and signals for requesting data of the detected flow rates of the second flow rate sensors 34, 44 and 54, respectively.

  Then, the connection controller 60 receives the detected flow rate data of the first flow rate sensors 14, 24 and the second flow rate sensors 34, 44, 54 from the first hot water supply controllers 17, 27 and the second hot water supply controllers 37, 47, 57, respectively. It receives and recognizes the detected flow rates of the first flow sensors 14, 24 and the second flow sensors 34, 44, 54.

  In subsequent STEP 22, the connection controller 60 determines whether or not the total amount of the detected flow rate of the first flow rate sensors 14, 24 and the second flow rate sensors 34, 44, 54 is no water (the total amount of the detected flow rate is zero). To do. Then, when the total detected flow rate is not water, the process proceeds to STEP 23, and the connection controller 60 determines whether or not the hot water supply capacity is insufficient based on the total detected flow rate. In STEP 22, when the total amount of the detected flow rate is no water, the process branches to STEP 30, and the connection controller 60 determines whether or not the circulation heat insulation condition is satisfied.

  Specifically, the connection controller 60 determines that the hot water supply capacity is insufficient every time the total amount of the detected flow rate exceeds a preset threshold value in a plurality of stages, and proceeds to STEP24. And the connection controller 60 is the hot water supply with which the water quantity servo (1st water quantity servo 13,23, 2nd water quantity servo 33,43,53) is plugged about five water heaters 10,20,30,40,50. Among the water heaters, the water amount servo of the water heater with the highest priority is opened to increase the number of water heaters in the operating state (the state of heating the circulating water), and the process returns to STEP 22.

  On the other hand, if it is determined in STEP 23 that the hot water supply capacity is not insufficient, the process branches to STEP 40, and the connection controller 60 determines whether the hot water supply capacity is excessive. Specifically, the connection controller 60 has an excessive hot water supply capacity each time the total amount of the detected flow rate of the first flow rate sensors 14, 24 and the second flow rate sensors 34, 44, 54 becomes smaller than the threshold value in the plurality of stages. It judges that there exists, and progresses to STEP41.

  In the connection controller 60, the water quantity servos (first water quantity servos 13, 23, second water quantity servos 33, 43, 53) are opened for the five water heaters 10, 20, 30, 40, 50. Among the water heaters (water heaters in the operating state), the water amount servo of the water heater with the lowest priority is closed to reduce the number of water heaters in the operating state.

  If it is determined in STEP 40 that the hot water supply capacity is not excessive, the process proceeds from STEP 40 to STEP 22. In this case, the number of water heaters in the operating state is not changed.

  In addition, in this embodiment, as shown to Fig.5 (a), although the priority was continuously set with respect to P water heater 10,20 and N water heater 30,40,50, As shown in FIG. 5B, the priority order may be set by distinguishing between the P water heaters 10, 20 and the N water heaters 30, 40, 50.

  In this case, for example, when only the circulation pump 16 of the P water heater 10 is operated according to the circulation load during the circulation heat insulation operation, both the circulation pump 16 of the P water heater 10 and the circulation pump 26 of the P water heater 20 are used. It is possible to perform control to switch between the cases where the is operated. In addition, during the hot water supply operation, the N water heaters 30, 40, 50 are preferentially operated over the P water heaters 10, 20, so that the total operation time of each of the water heaters 10, 20, 30, 40, 50 is made uniform. Control can be performed.

  Moreover, although the example which provided the connection controller 60 separately from the water heaters 10, 20, 30, 40, 50 was shown in this embodiment, it has the function of the connection controller 60 in the hot water controller of one of the water heaters. The configuration may be a In this case, the remote controller is connected to the hot water supply controller.

  In the present embodiment, an instant hot water supply system including two P water heaters and three N water heaters is shown. However, if an immediate hot water system includes at least one P water heater and one N water heater, The invention can be applied.

  Moreover, although the water heater provided with the burner (a gas burner, a kerosene burner, etc.) was shown in this embodiment, you may use the water heater using other types of heat sources, such as electricity.

  DESCRIPTION OF SYMBOLS 1 ... Instant hot water supply system, 2 ... 1st forward pipe, 3 ... 2nd forward pipe, 4 ... Return pipe, 5,6 ... Check valve, 29, 39, 49, 59 ... Branch pipe, 10, 20 ... P ( Water heater, with circulation pump) 17, 27 ... First hot water controller, 30, 40, 50 ... N (without circulation pump) Water heater, 11, 12 ... First heat exchanger, 12, 22 ... First burner, 13 , 24 ... 1st water quantity servo, 14, 24 ... 1st flow sensor, 15, 25 ... 1st temperature sensor, 16, 26 ... Circulation pump, 31, 41, 51 ... 2nd heat exchanger, 32, 42, 52 ... 2nd burner, 33, 43, 53 ... 2nd water quantity servo, 34, 44, 54 ... 2nd flow sensor, 37, 47, 57 ... 2nd hot water supply controller, 60 ... Connection controller, 70 ... Remote control.

Claims (3)

A first forward pipe having one end connected to the water supply and the other end connected to a tap;
A return pipe communicating between one end and the other end of the first forward pipe;
Circulation connected to the middle of the first forward pipe for circulating hot water in a circulation circuit comprising a first heating section for heating the hot water flowing through the first forward pipe, and the first forward pipe and the return pipe. A first water heater comprising a pump;
A second forward pipe communicating with the upstream side and the downstream side of the first hot water heater of the first forward pipe;
A second heating unit connected in the middle of the second forward pipe for heating the hot water flowing through the second forward pipe; and a second flow rate sensor for detecting a flow rate of hot water flowing from the second forward pipe. A second water heater provided,
A check valve that allows water to flow from the second forward pipe to the second hot water heater and disables water from the second hot water heater to the second forward pipe;
When the detected flow rate of the second flow rate sensor is less than a predetermined hot water supply detection flow rate, a circulation heat retention operation for operating the first heating unit is performed in a state where the circulation pump is operated, and the second flow rate sensor When the detected flow rate is equal to or higher than the detected hot water supply flow rate, a control for executing a hot water supply operation for operating at least one of the first heating unit and the second heating unit with the circulation pump stopped. An instant hot water supply system characterized by comprising a part. In the instant hot water supply system according to claim 1,
The second water heater includes a water flowable state in which water can be passed from the second forward pipe to the second heating unit, and a water passage incapable of passing water from the second forward pipe to the second heating unit. A second water flow switching valve that switches between water-impossible states,
A plurality of second hot water supply units having the second water heater and the second forward pipe;
The controller is configured to allow at least one of the plurality of second water heaters to pass through the second water flow switching valve, to perform the circulation heat insulation operation, and during the execution of the circulation heat insulation operation, When the detected flow rate of the second flow rate sensor of the second water heater that is in a water flowable state becomes equal to or higher than the detected hot water flow rate, the circulating heat insulation operation is terminated and the hot water supply operation is executed.
During execution of the hot water supply operation, the number of second water heaters that are allowed to pass water is changed according to the total amount of flow detected by the second flow rate sensor of the second water heater that is allowed to pass water. Instant hot water supply system characterized by that. In the immediate hot water supply system according to claim 1 or claim 2,
The first water heater includes a first flow rate sensor that detects a flow rate of hot water flowing from the first forward pipe, and a flowable state in which water can be passed from the first forward pipe to the first heating unit. A first water flow switching valve that switches between a water non-flowable state in which water cannot be passed from the first forward pipe to the first heating unit,
A plurality of first hot water supply units having the first water heater and the first forward pipe;
The control unit is configured to allow water to flow in accordance with a total amount of flow detected by the first flow rate sensor of the first water heater that is in a water flowable state during execution of the hot water supply operation. Instant hot water supply system characterized by changing the number of units.

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