Hot water system

Abstract

To provide a hot water supply system that can properly fill water in a plurality of circuits.SOLUTION: A hot water supply system operates a water-supply booster pump 37 in filling water, executes a water-supply tank mode of filling water from a water-supply tank 2 to a water-supply circuit, a hot-water storage tank 6, and a hot-water supply outgoing pipe 71, and then executes a heating circuit mode of operating the water-supply booster pump 37 and heating circulation pumps 51, 52 to fill water in a heating circulation circuit, thereby properly filling water in respective circuits.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a hot water supply system, and more particularly to a hot water supply system in which water filling is performed during a test run. [Background technology]

[0002] A hot water supply system is known that includes a water supply device, a hot water storage device, a heating heat source, a water supply pump provided in a circuit connecting the water supply device and the hot water storage device, and a circulation pump provided in a circuit connecting the hot water storage device and the heating heat source, and that stores hot water heated by the heating heat source in a hot water storage tank and supplies the stored hot water to a hot water dispensing terminal (for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Special Publication No. 59-18613 Summary of the Invention [Problem to be solved by the invention]

[0004] In the hot water supply system described above, after installation is complete, it is necessary to properly fill the hot water storage device and the circuits connected to it with water. However, when multiple pumps are installed in multiple circuits as in Patent Document 1, even if the multiple pumps are operated simultaneously from the start of water filling, water filling may not be performed properly. If the heating heat source is operated without proper water filling, there is a risk of dry heating. Furthermore, if air remains in the circuit, the pump will run idle, reducing the pump's durability.

[0005] The present invention is intended to solve the above-mentioned problems, and an object of the present invention is to provide a hot water supply system in which water is appropriately filled in a plurality of circuits. [Means for solving the problem]

[0006] According to the present invention, A heating source; a hot water storage tank for storing hot water heated by a heating heat source; a heating circulation circuit that connects the heating heat source and the hot water storage tank and circulates hot water between the heating heat source and the hot water storage tank; a heating circulation pump provided in the heating circulation circuit; A hot water supply pipe connected to the hot water storage tank and supplying hot water from the hot water storage tank to the hot water outlet terminal; a water supply tank that receives water supplied from a water supply source; a water supply circuit connected to the heating circulation circuit and supplying water from the water supply tank to the heating heat source, the hot water storage tank, and the hot water outlet terminal; a water supply pressure pump provided in the water supply circuit; A control device that controls water filling during trial operation, The hot water supply system is configured such that, when filling the water tank with water, the control device operates a water supply pressure pump to execute a water supply tank mode in which water is filled from the water supply tank to the water supply circuit, hot water storage tank, and hot water supply supply pipe, and then operates the water supply pressure pump and heating circulation pump to execute a heating circuit mode in which water is filled into the heating circulation circuit.

[0007] According to the hot water supply system, when filling the tank with water, the water supply pressure pump is operated to fill the water supply circuit, hot water storage tank, and hot water supply pipe from the water supply tank, and the water supply pressure mode is first executed, so the water supply is filled by operating only the water supply pressure pump without operating the heating circulation pump. As a result, water is supplied from the water supply circuit to the large-capacity hot water storage tank, and the hot water storage tank and the hot water supply pipe connected to the hot water storage tank are filled with water, so air can be smoothly removed from the piping and the hot water storage tank.

[0008] Furthermore, according to the hot water supply system, since the water supply circuit is connected to the heating circulation circuit, if the water supply tank mode is executed and the water supply circuit is properly filled with water, the water supply pressure pump is operated to supply water to the water supply circuit, while the heating circulation pump provided in the heating circulation circuit is operated, thereby filling the heating circulation circuit with water and removing air from the piping.

[0009] Preferably, the hot water supply system further comprises: a hot water return pipe connected to the hot water storage tank and returning the hot water supplied from the hot water storage tank to the hot water outlet terminal; a hot water circulation circuit connected to the hot water supply pipe and the hot water return pipe, which circulates hot water between the hot water storage tank and the hot water outlet terminal; An instant hot water circulation pump provided in the instant hot water circulation circuit, The control device is configured to execute the water supply tank mode and the heating circuit mode when filling the water tank with water, and then to execute the instant hot water circuit mode by operating the water supply pressure pump and the instant hot water circulation pump to fill the instant hot water circulation circuit with water, or After the water supply tank mode is executed, the water supply pressure pump and the instant hot water circulation pump are operated to execute the instant hot water circuit mode in which water is filled in the instant hot water circulation circuit, and further the heating circuit mode is executed.

[0010] According to the hot water supply system, the water supply circuit, the hot water storage tank, the heating circuit, and the instant hot water circulation circuit formed by connecting the hot water supply pipe and the hot water return pipe must be filled with water. However, since the water supply tank mode is first executed, the hot water supply pipe can be filled with water. Furthermore, since the hot water supply pipe and the hot water return pipe of the instant hot water circulation circuit are connected, if the hot water supply pipe is properly filled with water, the instant hot water circulation pump provided in the instant hot water circulation circuit can be operated while the water supply pressure pump is operated to supply water to the water supply circuit, thereby filling the instant hot water circulation circuit with water and removing air from the piping. Furthermore, according to the hot water supply system, since the water supply circuit is connected to the heating circuit, if the water supply circuit is properly filled with water, regardless of whether the instant hot water circulation circuit is filled with water or not, the water supply pressure pump can be operated to supply water to the water supply circuit while the heating circulation pump provided in the heating circuit can be operated to fill the heating circulation circuit with water and remove air from the piping.

[0011] Preferably, in the hot water supply system, The control device is configured to disable some functions of the hot water supply system if water filling is not performed in at least one of the modes for a predetermined lower limit execution time or longer for each mode.

[0012] According to the above-mentioned hot water supply system, if water filling in at least one mode is not performed for at least the specified minimum execution time for each mode, some functions of the hot water supply system are disabled, thereby reliably preventing the heating source or pump from being operated when air has not been sufficiently removed from the piping.

[0013] Preferably, the hot water supply system further comprises: a pressure detection means for detecting the water pressure in the water supply circuit; a low water level detection means for detecting a predetermined low water level in the water supply tank; The control device operates the water supply pressure pump when the water pressure in the water supply circuit is less than a predetermined operation start pressure in each mode, When a low water level is detected while the water supply pressure pump is operating, the water supply pressure pump is stopped even if the water pressure is below the operation start pressure.

[0014] According to the hot water supply system, in each mode, the water supply pressure pump is continuously operated as long as the water pressure in the water supply circuit is below a predetermined operation start pressure, thereby enabling smooth water filling.

[0015] On the other hand, when water is supplied from the water supply tank to the water supply circuit, even if there is a shortage of water in the water supply tank and air enters the water supply circuit from the water supply tank, the water pressure will be below the start pressure, so the water supply pressure pump will continue to operate, and there is a risk of it running idly.

[0016] However, according to the above-mentioned hot water supply system, when a low water level is detected while the water supply booster pump is operating in each mode, the water supply booster pump is stopped even if the water pressure is below the start pressure, thereby preventing air from entering the water supply circuit from the water supply tank when the water in the water tank decreases, and reliably preventing idling. [Effects of the Invention]

[0017] As described above, according to the present invention, it is possible to provide a hot water supply system in which water is appropriately filled in a plurality of circuits. [Brief explanation of the drawings]

[0018] [Figure 1] FIG. 1 is a schematic diagram showing an example of a hot water supply system according to an embodiment of the present invention. [Figure 2] FIG. 2 is a table showing the water filling mode and other settings set by switch operation in the hot water supply system according to the embodiment of the present invention. [Figure 3] FIG. 3 is a flowchart showing a part of the water filling control operation in the hot water supply system according to the embodiment of the present invention. [Figure 4] FIG. 4 is a flowchart showing a part of the water filling control operation in the hot water supply system according to the embodiment of the present invention. [Figure 5] FIG. 5 is a flowchart showing a part of the water filling control operation in the hot water supply system according to the embodiment of the present invention. [Figure 6] FIG. 6 is a flowchart showing a part of the water filling control operation in the hot water supply system according to the embodiment of the present invention. [Figure 7] FIG. 7 is a flowchart showing the control operation of the water supply pressure pump in the hot water supply system according to the embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0019] Hereinafter, a hot water supply system according to an embodiment of the present invention will be described. FIG. 1 is a schematic diagram showing an example of a hot water supply system according to this embodiment. This hot water supply system can be used in commercial facilities such as hair salons. The hot water supply system includes a hot water pressurized tank unit 1 and a heat source unit 500. The hot water pressurized tank unit 1 supplies cold water and hot water to multiple hot water outlet terminals 400, such as showers and faucets. The heat source unit 500 includes a first gas heat source unit 501 and a second gas heat source unit 502, which are heating heat sources. The hot water pressurized tank unit 1 includes a water supply tank 2 that receives primary water supply and a hot water storage tank 6 that stores hot water heated by the first and second gas heat source units 501 and 502. The hot water supply system may include one or three or more gas heat source units as a heating heat source, and may use a heat pump, electric heater, or the like instead of the gas heat source units.

[0020] The first and second gas heat source units 501, 502 are gas water heaters, and although not shown, have a heating unit in the housing that has a gas burner, a heat exchanger, etc. The first and second gas heat source units 501, 502 and the hot water storage tank 6 are connected by a heating circulation circuit consisting of a heating supply pipe 40 that sends hot water from the hot water storage tank 6 and water from the water supply tank 2 to the first and second gas heat source units 501, 502, and a heating return pipe 44 that returns the hot water heated in the first and second gas heat source units 501, 502 to the hot water storage tank 6.

[0021] One end of the heating supply pipe 40 is connected to the bottom of the hot water storage tank 6, and the other end is branched into a first heating supply pipe 41 and a second heating supply pipe 42 so as to be connected to a first gas heat source unit 501 and a second gas heat source unit 502. The heating return pipe 44 is formed by joining a first heating return pipe 45 and a second heating return pipe 46, each of which has one end connected to the gas heat source units 501, 502, and the other end is connected to the top of the hot water storage tank 6. A heating supply temperature sensor 50 is disposed in the heating supply pipe 40 upstream of the branch point of the first and second heating supply pipes 41, 42 and downstream of the junction with the water supply pipe 3, which will be described later.

[0022] A first heating circulation pump 51 and a second heating circulation pump 52 are provided in the first and second heating supply pipes 41 and 42, respectively, and check valves 53 and 54 are provided downstream of the first and second heating circulation pumps 51 and 52. Therefore, by operating the first and second heating circulation pumps 51 and 52 and the first and second gas heat source units 501 and 502, hot water heated by the first and second gas heat source units 501 and 502 is stored in the hot water storage tank 6. The first and second heating circulation pumps 51 and 52 are connected to a hot water supply control device C, and their operation, stop, and rotation speed are controlled by control signals from the hot water supply control device C. In addition, the heat source unit controllers C1 and C2 of the first and second gas heat source units 501 and 502 are connected to the hot water supply control device C, and the operation of the first and second gas heat source units 501 and 502 is controlled by control signals from the hot water supply control device C. The detection signal of the detected temperature detected by the heating supply temperature sensor 50 is output to the hot water control device C, and detection signals such as the detected temperature detected by various sensors not shown in the figure arranged in the gas heat source machines 501 and 502 are output to the heat source machine control devices C1 and C2.

[0023] An under-tank temperature sensor 55 for detecting the temperature of the hot water supplied from the hot water storage tank 6 to the heating supply pipe 40, and a valve 56 are installed upstream of the junction with the water supply pipe 3 in the heating supply pipe 40 connected to the lower part of the hot water storage tank 6. A detection signal of the detected temperature detected by the under-tank temperature sensor 55 is output to the hot water supply control device C. The valve 56 can be opened and closed manually, but it may also be configured so that its opening and closing is controlled by a control signal from the hot water supply control device C.

[0024] The hot water storage tank 6 is made of a corrosion-resistant metal (e.g., stainless steel), and its periphery is covered with a heat insulating material (not shown). The capacity of the hot water storage tank 6 in this embodiment is, for example, 50 L. The lower part of the hot water storage tank 6 is connected to the previously described heating supply pipe 40 and a hot water supply return pipe 72 that returns hot water from the hot water outlet terminal 400 (described later). The upper part of the hot water storage tank 6 is connected to the previously described heating return pipe 44 and a hot water supply supply pipe 71 that connects to the hot water outlet terminal 400 (described later). The hot water storage tank 6 is equipped with a first hot water temperature sensor 61, a second hot water temperature sensor 62, and a third hot water temperature sensor 63, which detect the temperature of the hot water inside, attached in this order from top to bottom at a predetermined interval. The hot water supply pressurization tank unit 1 also includes an outside air temperature sensor 80 below the hot water storage tank 6 for detecting the outside air temperature. The temperature signals detected by these temperature sensors 61, 62, 63, and 80 are output to the hot water supply control device C.

[0025] An automatic air vent valve 57 for venting air from the hot water storage tank 6 and a heated return temperature sensor 58 for detecting the temperature of the hot water flowing into the hot water storage tank 6 are installed in the heated return pipe 44 connected to the top of the hot water storage tank 6. A detection signal of the detected temperature detected by the heated return temperature sensor 58 is output to the hot water supply control device C.

[0026] A substantially rectangular box-shaped water supply tank 2 is disposed above the hot water storage tank 6 to supply water to the gas heat source units 501 and 502, the hot water storage tank 6, and the hot water outlet terminal 400. In this embodiment, the capacity of the water supply tank 2 is, for example, 45 L. A primary water supply pipe 10, through which city water flows, is connected to the top of the water supply tank 2, and a water supply pipe 3 is connected to the bottom of the water supply tank 2. The primary water supply pipe 10 branches into two pipes, a first primary water supply pipe 11 and a second primary water supply pipe 12, which are connected to the water supply tank 2. The first and second primary water supply pipes 11 and 12 are respectively provided with, in order from upstream, a first governor 13, a second governor 14, a first water supply solenoid valve 15, and a second water supply solenoid valve 16. The first and second water supply solenoid valves 15 and 16 are connected to the hot water supply control device C and are controlled to open and close by control signals from the hot water supply control device C. In this way, by connecting multiple primary water supply pipes 11, 12 to the water supply tank 2, pressure loss can be reduced and water can be supplied to the water supply tank 2 in a short time. Although not shown, a portion of the water supply tank 2 is open to the atmosphere.

[0027] The water supply tank 2 has an opening in one side wall below the connection ports for the first and second primary water supply pipes 11, 12 and above the connection port for the water supply pipe 3. An overflow pipe 200 is connected to the opening in this side wall. On the other side wall of the water supply tank 2, an overfloat sensor 22, a Hi float sensor 23, a Low float sensor 24, and a low water level float sensor 25 are arranged in this order from top to bottom at predetermined intervals to detect the water level in the water supply tank 2. Although not shown, a substantially U-shaped trap pipe (not shown) is arranged in the water supply tank 2. One end of the trap pipe 2 is connected to the overflow pipe 200, and the other end is at approximately the same height as the overfloat sensor 22 and opens upward. Therefore, excess water is discharged to the outside through the trap pipe and the overflow pipe 200. Water level detection signals detected by the float sensors 22, 23, 24, and 25 are output to the hot water supply control device C.

[0028] One end of the water supply pipe 3 is connected to the bottom of the water supply tank 2, and branches upstream into a first water supply pipe 31 and a second water supply pipe 32 so that water flows in parallel. A water supply booster pump 37 is installed upstream of the branch point between the first water supply pipe 31 and the second water supply pipe 32. The water supply booster pump 37 is connected to the hot water supply control device C, and its operation, stoppage, and rotation speed are controlled by control signals from the hot water supply control device C.

[0029] The first water supply pipe 31 is provided with, from upstream to downstream, a check valve 33 and a pressure sensor (pressure detection means) 35 for detecting water pressure. The second water supply pipe 32 is provided with, from upstream to downstream, a check valve 34 and a water volume sensor (water volume detection means) 36 for detecting water flow rate. While it is possible to incorporate a pressure sensor and a water volume sensor in a single water passage without providing parallel water passages, pressure loss can be reduced by forming water passages so that water flows in parallel and incorporating a pressure sensor and a water volume sensor in each passage. Although the water flow rate differs in each passage, if the pressure loss is known, the water flow rate of the entire water supply pipe 3 can be calculated from the water flow rate detected by the water volume sensor 36. The detection signals of the detected pressure detected by the pressure sensor 35 and the detected flow rate detected by the water volume sensor 36 are output to the hot water supply control device C.

[0030] The first water supply pipe 31 and the second water supply pipe 32 join at a junction downstream of the pressure sensor 35 and the water volume sensor 36, and the other end of the water supply pipe 3 is connected to a junction with a heating supply pipe 40 connected to the bottom of the hot water storage tank 6. The water supply pipe 3 also branches into a water supply pipe 38 connected to the hot water outlet terminal 400 downstream of the junction of the first and second water supply pipes 31 and 32. Therefore, in this embodiment, by operating the water supply pressure pump 37, water is supplied to the hot water storage tank 6, the gas heat source units 501 and 502, and the hot water outlet terminal 400, and the water supply pipe 3, including the first and second water supply pipes 31 and 32 and the water supply pipe 38, constitutes a water supply circuit. The water supply pipe 38 branches into multiple parts depending on the number of showers and faucets in the hot water outlet terminal 400. A check valve 39 is provided in the water supply pipe 3 downstream of the branch point of the water supply outflow pipe 38.

[0031] One end of the hot water return pipe 72 is connected to the bottom of the hot water storage tank 6, and the other end is connected to the hot water supply pipe 71 at the hot water outlet terminal 400. An instant hot water circulation pump 73 is installed in the hot water return pipe 72, and an instant hot water return temperature sensor 74 and a check valve 75 are installed downstream of the instant hot water circulation pump 73. Therefore, in this embodiment, by operating the instant hot water circulation pump 73, hot water is circulated between the hot water storage tank 6 and the hot water outlet terminal 400, and the hot water supply pipe 71 and the hot water return pipe 72 connecting the hot water storage tank 6 and the hot water outlet terminal 400 constitute an instant hot water circulation circuit.

[0032] To summarize the main operational controls in the hot water supply system of this embodiment, when the hot water tap of the hot water outlet terminal 400 is opened and the water supply pressure pump 37 starts operating, if the temperature of the hot water detected by the third hot water storage temperature sensor 63 is higher than the predetermined hot water storage start temperature, water is supplied from the water supply tank 2 to the hot water storage tank 6 via the water supply pipe 3 and the heating supply pipe 40 below the tank connected to the hot water storage tank 6 without operating the first and second heating circulation pumps 51, 52, and the hot water in the hot water storage tank 6 is supplied to the hot water outlet terminal 400 via the hot water supply supply pipe 71. Furthermore, as the temperature of the hot water decreases due to the supply of water into the hot water storage tank 6, when the temperature of the hot water detected by the third hot water storage temperature sensor 63 falls below the hot water storage start temperature, the first and second heating circulation pumps 51, 52 begin operating, hot water is supplied from the bottom of the hot water storage tank 6 to the heating supply pipe 40, the water from the water supply tank 2 and the hot water from the hot water storage tank 6 are mixed and supplied to the first and second gas heat source units 501, 502. The hot water heated to a predetermined hot water outlet temperature in the first and second gas heat source units 501, 502 is then returned to the hot water storage tank 6 via the heating return pipe 44. Furthermore, hot water is sent from the hot water storage tank 6 to the hot water supply supply pipe 71, and hot water is supplied to the hot water outlet terminal 400 via the hot water supply supply pipe 71 (hot water outlet control).

[0033] Furthermore, when all hot water outlet terminals 400 are closed and the temperature of the hot water detected by the third hot water storage temperature sensor 63 falls below the hot water storage start temperature, the first and second heating circulation pumps 51, 52 begin to operate, the hot water in the hot water storage tank 6 is supplied to the first and second gas heat source units 501, 502, and the hot water heated to a predetermined hot water outlet temperature in the first and second gas heat source units 501, 502 is returned to the hot water storage tank 6, thereby maintaining the temperature of the hot water in the hot water storage tank 6 (hot water storage control).

[0034] In addition, when all hot water outlet terminals 400 are closed and a predetermined instant hot water start time has elapsed and the temperature of the hot water stagnating in the hot water supply pipe 71 and the hot water return pipe 72 has dropped, the instant hot water circulation pump 73 begins to operate, and hot water is circulated between the hot water storage tank 6 and the hot water outlet terminals 400 via the hot water supply pipe 71 and the hot water return pipe 72 (instant hot water control).

[0035] In the above-mentioned operation control, the first and second heating circulation pumps 51, 52 are operated simultaneously or individually depending on the amount of hot water used at the hot water outlet terminal 400 and the setting of the instant hot water control, and accordingly the first and second gas heat source units 501, 502 are also operated simultaneously or individually.

[0036] The hot water supply system includes a hot water supply control device C provided in the hot water supply pressurized tank unit 1, heat source machine control devices C1 and C2 provided in the first and second gas heat source machines 501 and 502, and a remote control R for a user to perform operations related to the operation of the hot water supply system. The hot water supply control device C and the heat source machine control devices C1 and C2 are connected to each other by wire or wirelessly so that they can communicate with each other, and the hot water supply control device C and the remote control R are connected to each other by wire or wirelessly so that they can communicate with each other.

[0037] The remote control R is a terminal device configured to instruct the hot water supply control device C on operational information such as turning the power of the hot water supply system on and off, the hot water storage temperature setting for the hot water in the hot water storage tank 6 (the hot water outlet temperature of the hot water dispensed from the first and second gas heat source units 501, 502 in hot water outlet control and hot water storage control), and setting the water pressure mode in response to the user's operation of an operation switch (not shown). The remote control R is equipped with a display that displays various information about the hot water supply system. Note that a mobile terminal such as a smartphone or tablet terminal connected to the hot water supply control device C so as to be able to communicate with it can be used instead of or together with the remote control R.

[0038] The hot water supply control device C and the heat source machine control devices C1 and C2 each consist of one or more electronic circuit units including a CPU, ROM, RAM, interface circuitry, etc. The memory stores various operation programs and various data such as setting values ​​for executing the operation programs.

[0039] The hot water supply control device C receives detection signals from the various sensors (temperature sensors 50, 55, 58, 61, 62, 63, 74, 80, pressure sensor 35, water volume sensor 36, float sensors 22-25) as well as operation information from a remote control R. Furthermore, the heat source machine control devices C1, C2 receive detection signals from various sensors (not shown) provided in the first and second gas heat source machines 501, 502, and output control signals to the hot water supply control device C. The hot water supply control device C controls the operation of the entire hot water supply system by controlling the operation of the gas heat source machines 501, 502, various pumps 37, 51, 52, 73, water supply solenoid valves 15, 16, etc.

[0040] Although not shown, the hot water supply control device C has an operation board equipped with a plurality of tactile switches (registered trademark) and a display unit as an operation unit for performing water filling and other operations during a test run. In this embodiment, each time the operator presses the tactile switch for water filling, a corresponding operation signal is generated, and the water filling shown in Figure 2 is performed. Details of the control operation for water filling will be described later, but to summarize the modes executed by switch operation, when the tactile switch is first pressed, the water filling operation program is started, and water filling in water supply tank mode is first performed. In this water supply tank mode, operation of the first and second water supply solenoid valves 15, 16 and operation of the water supply pressure pump 37 are enabled, and a predetermined message (e.g., "1-A") indicating that water supply tank mode is being executed is displayed on the display unit. By enabling the operation of the first and second water supply solenoid valves 15, 16, the opening and closing of the first and second water supply solenoid valves 15, 16 is controlled by a control signal from the hot water supply control device C, and by enabling the operation of the water supply pressure pump 37, the operation, stopping, and rotation speed of the water supply pressure pump 37 are controlled by a control signal from the hot water supply control device C. When the tactile switch is pressed a second time, water filling in the instant hot water circuit mode is performed. In this instant hot water circuit mode, the operation of the first and second water supply solenoid valves 15, 16 and the operation of the water supply pressure pump 37 are enabled, the instant hot water circulation pump 73 is operated, and a predetermined display (e.g., "1-b") indicating that the instant hot water circuit mode is being executed is displayed on the display unit. When the tactile switch is pressed a third time, water filling in the heating circuit mode is performed. In this heating circuit mode, the operation of the first and second water supply solenoid valves 15, 16 and the operation of the water supply pressure pump 37 are enabled, the first and second heating circulation pumps 51, 52 are activated, and a predetermined display (e.g., "1-C") indicating that the heating circuit mode is being executed is displayed on the display unit.When the tactile switch is pressed a fourth time, if the execution time of each mode (i.e., the interval between pressing the tactile switch) is at least a predetermined minimum execution time, the test run is deemed complete, and a predetermined message (e.g., "End") indicating the completion of the test run is displayed on the display for a predetermined time. If the execution time of any one mode is less than the predetermined minimum execution time, the test run is deemed incomplete, and a predetermined message (e.g., "CL") indicating the incomplete test run is displayed on the display for a predetermined time, and water filling is terminated. Therefore, in this embodiment, the hot water supply control device C constitutes a control device that controls water filling during the test run. Note that, to avoid incorrect operation, the tactile switch may be pressed continuously for a certain period of time to generate an operation signal. Furthermore, the minimum execution time for each mode may be the same or different.

[0041] Before normal operation such as hot water discharge control and hot water storage control is performed, the hot water supply system is filled with water as a trial run. When installing the hot water supply system in a facility, the hot water supply pressurized tank unit 1 and the heat source unit 500 are each installed in an appropriate location, and then piping is connected between the water supply source and the hot water supply pressurized tank unit 1, between the hot water supply pressurized tank unit 1 and the heat source unit 500, and between the hot water supply pressurized tank unit 1 and the hot water discharge terminal 400, and power supply lines are connected to each unit. Then, once the workers have completed the preparation work for the trial run, water is filled as a trial run.

[0042] 3 to 7 show the processing of the hot water supply control device C when water filling is performed. In this embodiment, water filling is performed in the order of the water supply tank mode, instant hot water circuit mode, and heating circuit mode during trial operation, as described above, but water filling can also be performed in the order of water supply tank mode, heating circuit mode, and instant hot water circuit mode. Furthermore, if other circuits are provided, water filling in the other circuits can be performed before or after the instant hot water circuit mode or heating circuit mode as long as the water supply tank mode is performed first.

[0043] After the operator opens all of the hot water outlet terminals 400, when the tactile switch is pressed for the first time (step S1), a trial run completion flag F (described later) is reset (F=0) (step S2), the trial run is in an incomplete state, and the water supply tank mode is initiated (step S3). Then, the predetermined display described above is displayed on the display unit, the operation of the first and second water supply solenoid valves 15, 16 is enabled, the first and second water supply solenoid valves 15, 16 are opened, and water is supplied to the water supply tank 2 (step S4). During water filling, the first and second water supply solenoid valves 15, 16 are closed when the high float sensor 23 is turned on, stopping the supply of water to the water supply tank 2, and are controlled so that either or both of them are opened when the low float sensor 24 is turned off, supplying water to the water supply tank 2.

[0044] When the Hi float sensor 23 turns on (Yes in step S5), a timer is started to count a predetermined lower limit execution time (e.g., one minute). Next, the operation of the water supply pressure pump 37 is enabled, and the water supply pressure pump 37 is operated at a predetermined rotation speed to start supplying water from the water supply tank 2 to the water supply circuit (step S6). As a result, water is supplied from the water supply circuit to the hot water storage tank 6 via the heating supply circuit 40 below the tank, and further water is supplied from the hot water storage tank 6 to the hot water supply supply pipe 71, thereby filling the water supply circuit, the hot water storage tank 6, the hot water supply supply pipe 71, and the water supply supply pipe 38 with water. Note that the water supply circuit and the heating circulation circuit are connected at the confluence of the heating supply pipe 40 below the hot water storage tank 6, but because the heating circulation pumps 51 and 52 provided in the heating circulation circuit are not operated, water is not filled up to the heating circulation circuit downstream of the heating circulation pumps 51 and 52 in the water supply tank mode.

[0045] 7, in this embodiment, when the operation of the water supply pressure pump 37 is enabled during water filling, the water supply pressure pump 37 is controlled so that it operates if the Hi float sensor 23 turns on (steps S71 to S72) and stops if the low water level float sensor 25 turns off (steps S73 to S74). This makes it possible to prevent air from entering the water supply circuit from the water supply tank 2.

[0046] Although not shown, in this embodiment, the water supply pressure booster pump 37 is controlled so that, when enabled, it activates when the water pressure in the water supply circuit detected by the pressure sensor 35 falls below a predetermined activation pressure (e.g., 135 kPa) and stops when the water pressure remains at or above a predetermined stop pressure (e.g., 180 kPa) for a predetermined duration (e.g., 5 seconds). This allows water to be continuously supplied from the water supply tank 2 to the water supply circuit while the circuit is open, ensuring smooth water filling. Furthermore, the water supply pressure booster pump 37 is prevented from operating for a long period of time while the circuit is closed, reducing the load on the pump. If the water supply pressure booster pump 37 is enabled after the Hi float sensor 23 turns on at the start of water filling, it is possible to prevent hunting, which occurs when the water supply pressure booster pump 37 repeatedly starts and stops within a short period of time due to a lack of water in the water supply tank 2 causing the low water level float sensor 25 to turn off.

[0047] 3, if the minimum execution time elapses (Yes in step S7) without the tactile switch being pressed a second time (No in step S9) during execution of the water tank mode, the execution history of the water tank mode is stored in memory (step S8). Then, if the tactile switch is pressed a second time (Yes in step S9) after the minimum execution time has elapsed (Yes in step S7), the water tank mode is ended (step S10).

[0048] On the other hand, if the tactile switch is pressed a second time (Yes in step S9) before the minimum execution time has elapsed (No in step S7), the execution history of the water supply tank mode is not stored in the memory, and the water supply tank mode is terminated (step S10).

[0049] Depending on the length of the hot water return pipe 73, while the water tank mode is running, before the tactile switch is pressed a second time, the operator checks that water is filled up to the hot water outlet terminal 400, closes the hot water outlet terminal 400, opens the drain valve (not shown) of the instant hot water return pipe 72, and closes the drain valve when water is filled up to the middle of the hot water return pipe 72. The drain valve is located, for example, near the instant hot water circulation pump 73.

[0050] When the operator presses the tactile switch a second time (Yes in step S9) as described above and the instant hot water circuit mode is initiated (step S20), the display unit displays the predetermined message, the water supply solenoid valves 15 and 16 and the water supply pressure pump 37 continue to operate, and the instant hot water circulation pump 73 is activated (step S21). A timer is also started to count the minimum execution time (e.g., one minute). At this time, the hot water supply terminal 400 is closed, but the heating circuit is not filled with water. Therefore, the pressure in the heating circuit is lower than that in the water supply circuit and the instant hot water circulation circuit. The hot water return pipe 72 is connected to the hot water storage tank 6. Therefore, the air in the heating circuit acts as a buffer, preventing the water pressure in the water supply circuit, detected by the pressure sensor 35, from rising above the stop pressure even when the water supply pressure pump 37 and the instant hot water circulation pump 73 are activated. Therefore, air in the piping can be sent to the hot water storage tank 6, allowing the instant hot water circulation circuit to be filled with water without having to open the circuit. Depending on the amount of air in the hot water storage tank 6, air is discharged from an automatic air vent valve 57 provided in the hot water storage tank 6.

[0051] As with the water supply tank mode, if the tactile switch is not pressed a third time during execution of the instant hot water circuit mode (No in step S24) and the minimum execution time has elapsed (Yes in step S22), the execution history of the instant hot water circuit mode is stored in memory (step S23). If the tactile switch is pressed a third time (Yes in step S24) after the minimum execution time has elapsed (Yes in step S22), the instant hot water circuit mode is terminated (step S25).

[0052] On the other hand, if the tactile switch is pressed a third time (Yes in step S24) before the lower limit execution time has elapsed (No in step S22), the execution history of the instant hot water circuit mode is not stored in memory, and the instant hot water circuit mode is terminated (step S25).

[0053] When the operator presses the tactile switch a third time (Yes in step S25), the instant hot water circulation pump 73 is stopped (step S26), and the heating circuit mode is initiated (step S40). When the heating circuit mode is initiated, the display unit displays the predetermined message, the water supply solenoid valves 15 and 16 and the water supply pressure pump 37 continue to operate, and the first and second heating circulation pumps 51 and 52 are activated (step S41). A timer is also started to count the minimum execution time (e.g., one minute). This causes water to be supplied from the water supply circuit to the heating circulation circuit, filling the heating circulation circuit with water. As mentioned above, the hot water storage tank 6 is equipped with the automatic air vent valve 57, so air can be vented through the automatic air vent valve 57 without opening the hot water outlet terminal 400. However, the hot water outlet terminal 400 may be opened before starting the heating circuit mode. In addition, during normal operation after the trial run is completed, when water is supplied to the gas heat source units 501, 502 at a rate equal to or greater than the specified ignition flow rate, heating control is performed in the gas heat source units 501, 502.However, since there is no need to supply hot water from the gas heat source units 501, 502 when filling with water, in the heating circuit mode, water filling is performed without operating the gas heat source units 501, 502.

[0054] As with the water tank mode and the instant hot water circuit mode, if the tactile switch is not pressed a fourth time during the execution of the heating circuit mode (No in step S44) and the minimum execution time has elapsed (Yes in step S42), the execution history of the heating circuit mode is stored in memory (step S43). Then, if the tactile switch is pressed a fourth time (Yes in step S44) after the minimum execution time has elapsed (Yes in step S42), the heating circuit mode is terminated (step S45).

[0055] On the other hand, if the tactile switch is pressed a fourth time (Yes in step S44) before the lower limit execution time has elapsed (No in step S42), the execution history of the heating circuit mode is not stored in the memory, and the heating circuit mode is terminated (step S45).

[0056] When the operator presses the tactile switch a fourth time as described above (Yes in step S44), the first and second heating circulation pumps 51, 52 are stopped (step S46). Note that the operation of the first and second water supply solenoid valves 15, 16 is enabled, but as described above, if the Hi float sensor 23 turns on, the first and second water supply solenoid valves 15, 16 are closed, and the supply of water to the water supply tank 2 is stopped. Also, the operation of the water supply pressure pump 37 is enabled, but as described above, if the water pressure in the water supply circuit exceeds the stop pressure, the water supply pressure pump 37 is stopped.

[0057] Next, it is determined whether or not there is an execution history for each mode, and if there is an execution history for all modes (Yes in step S60), water filling has been performed for at least the predetermined minimum execution time in each mode, so it is determined that the test run is complete, the display unit displays the predetermined test run completion message described above, and the test run completion flag F is set (F=1) (steps S61-S62). This allows various functions of the hot water supply system to be enabled after water filling has been performed.

[0058] On the other hand, if there is no execution history of any one of the modes (No in step S60), there is a possibility that water filling was not performed properly in one of the modes, so it is determined that the trial run is incomplete, the display unit shows the predetermined trial run incomplete message described above, and the value of the trial run completion flag F remains F = 0 (steps S63 to S64). If the trial run completion flag F is not set, after water filling is performed, at least some functions such as the anti-freeze control that circulates hot water and keeps the pipes warm using a heater, and the hot water discharge control, hot water storage control, and instant hot water control described above are disabled, and operation of the gas heat source units 501, 502 and various pumps 37, 51, 52, 73, etc. is prohibited.

[0059] As described above in detail, according to this embodiment, when filling the water tank, water is supplied to the water supply tank 2 and the water supply pressure pump 37 is operated to fill the water supply circuit, the hot water storage tank 6, and the hot water supply feed pipe 71 from the water supply tank 2. Therefore, water filling is performed by operating only the water supply pressure pump 37 without operating the heating circulation pumps 51 and 52. As a result, water is supplied intensively from the water supply circuit to the large-capacity hot water storage tank 6, and water is filled into the hot water storage tank 6 and the hot water supply feed pipe 71 connected to the hot water storage tank 6. This allows smooth bleeding of air in the piping and the hot water storage tank 6. Furthermore, according to this embodiment, since the water supply circuit is connected to the heating circulation circuit, once the water supply tank mode is executed and the water supply circuit is properly filled with water, the water supply pressure pump 37 is operated to supply water to the water supply circuit, while the heating circulation pumps 51 and 52 provided in the heating circulation circuit are operated, thereby filling the heating circulation circuit with water and bleeding of air in the piping.

[0060] Furthermore, according to this embodiment, the instant hot water circulation circuit still needs to be filled with water. However, since the water tank mode is first executed, at least the hot water supply pipe 71 can be filled with water. Furthermore, since the hot water supply pipe 71 and the hot water return pipe 72 of the instant hot water circulation circuit are connected, if the hot water supply pipe 71 is properly filled with water, the instant hot water circulation pump 73 provided in the instant hot water circulation circuit can be operated while the water pressure pump 37 is operated to supply water to the water circuit, thereby filling the instant hot water circulation circuit with water and removing air from the piping. Furthermore, according to this embodiment, since the water supply circuit is connected to the heating circulation circuit, if the water supply circuit is properly filled with water, regardless of whether the instant hot water circulation circuit is filled with water or not, the heating circulation pumps 51 and 52 provided in the heating circulation circuit can be operated while the water pressure pump 37 is operated to supply water to the water circuit, thereby filling the heating circulation circuit with water and removing air from the piping.

[0061] Furthermore, according to this embodiment, the water supply tank mode, heating circuit mode, and instant hot water circuit mode each have a predetermined minimum execution time, so that in each mode, the various pumps 37, 51, 52, and 73 are operated to fill the circuit with water for at least the minimum execution time. Furthermore, according to this embodiment, if water filling is not performed for at least the predetermined minimum execution time in at least one mode, the trial run is deemed incomplete and some functions of the hot water supply system are disabled, so that it is possible to reliably prevent the gas heat source units 501 and 502 and the pumps 37, 51, 52, and 73 from being operated in a state in which air has not been sufficiently purged from the piping.

[0062] Furthermore, according to this embodiment, in the water supply tank mode, heating circuit mode, and instant hot water circuit mode, if the water pressure in the water supply circuit is below a predetermined operation start pressure, the water supply pressure pump 37 is continuously operated, thereby enabling smooth water filling.

[0063] On the other hand, when water is supplied to the water supply circuit from the water supply tank 2, even if there is a shortage of water in the water supply tank 2 and air enters the water supply circuit from the water supply tank 2, the water pressure will be less than the start pressure, so the water supply pressure pump 37 will continue to operate, and there is a risk of it running idly.

[0064] However, according to this embodiment, when a low water level is detected while the water supply booster pump 37 is operating in each mode, the water supply booster pump 37 is stopped even if the water pressure is below the start pressure, thereby preventing air from entering the water supply circuit from the water supply tank 2 when the water in the water supply tank 2 decreases, and reliably preventing the water supply booster pump 37 from running idly.

[0065] As described above, according to this embodiment, it is possible to provide a hot water supply system that can appropriately fill a plurality of circuits with water. [Explanation of symbols]

[0066] 2 water tanks 25 Low water level float sensor 3 Water supply pipe 35 Pressure Sensor 37 Water supply pressure pump 6 Hot water tank 40 Heating supply pipe 44 Heat return pipe 51,52 Heating circulation pump 71 Hot water supply pipe 72 Hot water return pipe 501,502 Gas heat source machine C. Hot water control device

Claims

1. A heating source; a hot water storage tank for storing hot water heated by a heating heat source; a heating circulation circuit that connects the heating heat source and the hot water storage tank and circulates hot water between the heating heat source and the hot water storage tank; a heating circulation pump provided in the heating circulation circuit; A hot water supply pipe connected to the hot water storage tank and supplying hot water from the hot water storage tank to the hot water outlet terminal; a water supply tank that receives water supplied from a water supply source; a water supply circuit connected to the heating circulation circuit and supplying water from the water supply tank to the heating heat source, the hot water storage tank, and the hot water outlet terminal; a water supply pressure pump provided in the water supply circuit; a hot water return pipe connected to the hot water storage tank and returning the hot water supplied from the hot water storage tank to the hot water outlet terminal; a hot water circulation circuit connected to the hot water supply pipe and the hot water return pipe, which circulates hot water between the hot water storage tank and the hot water outlet terminal; an instant hot water circulation pump provided in the instant hot water circulation circuit; A control device that controls water filling during trial operation, The control device is configured to, when filling with water, operate the water supply pressure pump to execute a water supply tank mode in which water is filled from the water supply tank to the water supply circuit, hot water storage tank, and hot water supply supply pipe, then operate the water supply pressure pump and heating circulation pump to execute a heating circuit mode in which water is filled in the heating circulation circuit, and further, after executing the water supply tank mode and heating circuit mode, operate the water supply pressure pump and instant hot water circulation pump to execute an instant hot water circuit mode in which water is filled in the instant hot water circulation circuit, or The hot water supply system is configured such that, when filling with water, a water supply tank mode is executed by operating a water supply pressure pump to fill water from a water supply tank to a water supply circuit, a hot water storage tank, and a hot water supply supply pipe, and then an instant hot water circuit mode is executed by operating a water supply pressure pump and an instant hot water circulation pump to fill water in the instant hot water circulation circuit, and further, after the water supply tank mode and instant hot water circuit mode are executed, a heating circuit mode is executed by operating a water supply pressure pump and a heating circulation pump to fill water in the heating circulation circuit.

2. The hot water supply system according to claim 1, The hot water supply system is configured such that the control device disables some functions of the hot water supply system if water filling is not performed for a predetermined minimum execution time or longer in at least one mode.

3. A heating heat source; a hot water storage tank for storing hot water heated by a heating heat source; a heating circulation circuit that connects the heating heat source and the hot water storage tank and circulates hot water between the heating heat source and the hot water storage tank; a heating circulation pump provided in the heating circulation circuit; A hot water supply pipe connected to the hot water storage tank and supplying hot water from the hot water storage tank to the hot water outlet terminal; a water supply tank that receives water supplied from a water supply source; a water supply circuit connected to the heating circulation circuit and supplying water from the water supply tank to the heating heat source, the hot water storage tank, and the hot water outlet terminal; a water supply pressure pump provided in the water supply circuit; A control device that controls water filling during trial operation, The control device is configured to, when filling with water, operate the water supply pressure pump to execute a water supply tank mode in which water is filled from the water supply tank to the water supply circuit, the hot water storage tank, and the hot water supply supply pipe, and then operate the water supply pressure pump and the heating circulation pump to execute a heating circuit mode in which water is filled in the heating circulation circuit; The hot water supply system is configured such that the control device disables some functions of the hot water supply system if water filling is not performed in at least one mode for a predetermined minimum execution time or longer for each mode.

4. The hot water supply system according to any one of claims 1 to 3 further comprises: a pressure detection means for detecting the water pressure in the water supply circuit; a low water level detection means for detecting a predetermined low water level in the water supply tank; The control device operates the water supply pressure pump when the water pressure in the water supply circuit is less than a predetermined operation start pressure in each mode, A hot water supply system configured to stop the water supply booster pump when a low water level is detected while the water supply booster pump is operating, even if the water pressure is below the operation start pressure.

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