JP2020012622A - Hot water system - Google Patents

Abstract

To provide a technology for determining that connection between a hot water storage unit and a second heat source unit is wrong, during air bleeding operation.SOLUTION: A hot water system includes a hot water storage unit, a first heat source unit and a second heat source unit. The hot water storage unit includes a water supply path at a lower part of a hot water storage tank, a hot water path at an upper part of the hot water storage tank, a first hot water supply path to a hot water faucet, and a hot water flow rate sensor of the hot water path. The second heat source unit includes a heating path connected to the hot water path, a second hot water supply path branched from the heating path, a third hot water supply path branched from the heating path and connected to the first hot water supply path, an opening/closing valve of the second hot water supply path, and a check valve of the third hot water supply path. The hot water system can execute air bleeding operation for bleeding air from the hot water storage tank by supplying water to the hot water storage tank from the water supply path by opening the opening/closing valve, and in the case where a detection value of the hot water flow rate sensor is equal to or less than a first predetermined value during the air bleeding operation, it determines that the connection between the hot water storage unit and the second heat source is wrong.SELECTED DRAWING: Figure 1

Description

  The technology disclosed in this specification relates to a hot water supply system.

  The hot water supply system disclosed in Patent Literature 1 includes a tank unit, a heat pump unit, and a gas heat source unit. The tank unit includes a hot water tank, and water in the hot water tank is supplied to the gas heat source unit via a hot water path connected to an upper portion of the tank. The gas heat source unit includes a heating path connected to the hot water path via a first inter-unit path, and a hot water path branched from the heating path. Thereby, the water in the hot water storage tank is heated while passing through the heating path, and is supplied to the bath tub via the hot water path.

  The tank unit has a hot water supply path connected to a hot water tap, and the hot water supply path is connected to a path branched from the heating path of the gas heat source unit via a second inter-unit path. Thereby, the water in the hot water storage tank passes through the hot water path, the heating path, and the hot water supply path, and is supplied to the hot water tap.

  As described above, the path from the tank unit to the gas heat source unit is formed by connecting the hot water path and the heating path via the first unit path, and the path branched from the heating path and the hot water supply path are connected to the second path. By connecting via the inter-unit path, a path from the gas heat source unit to the tank unit is configured. By these connections, the tank unit and the gas heat source unit are connected.

  Further, the hot water supply system disclosed in Patent Literature 1 can execute an air release operation. Specifically, the tank unit further includes a water supply path connected to a lower part of the hot water storage tank. Then, the hot water supply system opens an on-off valve provided in the hot water path, supplies water to the hot water storage tank from the water supply path, and stores the hot water through the hot water path, the heating path, and the hot water path. An air bleed operation for bleeding air from the tank can be performed.

JP-A-2006-125678

  As described above, the tank unit and the gas heat source unit are connected via the first unit path and the second unit path. However, the connection between the first unit path and the second unit path may be incorrect.

  The present specification provides a technique for determining that the connection between the hot water storage unit and the second heat source unit by the inter-unit path is incorrect during the air release operation.

  The hot water supply system disclosed in this specification includes a hot water storage unit, a first heat source unit, and a second heat source unit. The hot water storage unit includes a hot water storage tank that stores water, a water supply path connected to a lower part of the hot water storage tank, a hot water path connected to an upper part of the hot water storage tank, and a first hot water supply path connected to a hot water tap. A hot water flow sensor provided in the hot water path. The first heat source unit heats water sent from the hot water storage tank and sends out the heated water to the hot water storage tank. The second heat source unit has a heating path connected to the hot water path of the hot water storage unit, a second hot water supply path branched from the heating path, and a branched path from the heating path, and is connected to the first hot water supply path. A third hot water supply path, a heating flow rate sensor provided in the heating path, an on-off valve provided in the second hot water supply path, and a check valve provided in the third hot water supply path. Prepare. The hot water path of the hot water storage unit and the heating path of the second heat source unit are connected via a first inter-unit path, and the first hot water supply path of the hot water storage unit and the third hot water supply path of the second heat source unit are a second inter-unit path. Connected via The hot water supply system opens the on-off valve to supply water to the hot water storage tank from the water supply path, and the hot water storage tank via the hot water path, the heating path, and the second hot water supply path. An air bleeding operation for bleeding air from the first unit. If the detected value of one of the hot water flow rate sensor and the heating flow rate sensor is equal to or less than a first predetermined value during the air bleeding operation, And it is determined that the connection by the second unit path is incorrect.

  In the above configuration, when the connection between the first unit path and the second unit path is correct, when the hot water supply system performs an air bleeding operation, the air in the hot water path passes through the second hot water supply path via the heating path. Flows to As a result, one of the detection values of the hot water flow sensor provided in the hot water path and the heating flow sensor provided in the heating path becomes larger than a predetermined value. On the other hand, in the above configuration, it is assumed that the hot water path and the third hot water supply path are erroneously connected, and the first hot water supply path and the heating path are erroneously connected. In this case, when the hot water supply system performs the air release operation, the air in the hot water path is blocked by the check valve. Further, since the air in the hot water path is blocked by the check valve, no air flows in the heating path. As a result, one of the detection values of the hot water flow sensor provided in the hot water path and the heating flow sensor provided in the heating path becomes equal to or less than a predetermined value. According to the above configuration, the hot water storage unit and the second heat source unit are used during the air bleeding operation by using one of the detection values of the hot water flow sensor provided in the hot water path and the heating flow sensor provided in the heating path. It can be determined that the connection by the unit-to-unit path between is incorrect.

It is a figure which shows the structure of the hot-water supply system 10 typically. It is a flowchart which shows the operation | movement of the air removal operation of the hot-water supply system 10. It is a figure which shows the structure at the time of incorrect connection typically.

The main features of the embodiment described below are listed. The technical elements described below are independent technical elements, each exhibiting technical utility independently or in various combinations, and are not limited to the combinations described in the claims at the time of filing. Absent.
(Feature 1) In the hot water supply system, in the air bleeding operation, one of the detected values of the hot water flow sensor and the heated flow sensor is equal to or less than a first predetermined value, and the other detected value of the hot water flow sensor and the heated flow sensor is If the value is equal to or less than the second predetermined value, it may be determined that the connection between the first unit route and the second unit route is incorrect. By using the detection values of two sensors, it is possible to increase the reliability of the determination of an erroneous connection as compared with a configuration using the detection values of one sensor.
(Feature 2) The hot water storage unit may further include a cold water path that branches off from the water supply path and joins the hot water path. A chilled water flow sensor may be provided in the chilled water path. In the hot water supply system, when the detected value of one of the hot water flow rate sensor and the heated flow rate sensor is equal to or less than the first predetermined value and the detected value of the cold water flow rate sensor is equal to or less than the third predetermined value during the air release operation Alternatively, it may be determined that the connection between the first unit path and the second unit path is incorrect. If the connection between the first unit path and the second unit path is incorrect, the air flow in the hot water path is interrupted by the check valve during the air release operation, and the air flow in the cold water path is interrupted. Little air or water flows. For this reason, by using both the above one detection value and the detection value of the chilled water flow sensor, it is possible to improve the reliability of the determination of the incorrect connection as compared with the configuration using only one detection value. it can.
(Feature 3) In the hot water supply system, when the detection value of the flow rate sensor (for example, the hot water flow rate sensor) is equal to or less than a predetermined value (for example, a first predetermined value) for a predetermined period during the air release operation, The connection between the first unit path and the second unit path may be determined to be incorrect. For example, even when the detection value is less than or equal to a predetermined value, the reliability of the determination of the erroneous connection can be improved as compared with a configuration in which the erroneous connection is determined even when the detection value is intermittent.

(First embodiment)
A hot water supply system 10 according to the present embodiment will be described with reference to FIG. FIG. 1 is a system diagram of the hot water supply system 10, in which flows of water and a heat medium are indicated by arrows. As shown in FIG. 1, the hot water supply system 10 includes a hot water storage unit 20, a heat pump unit 40, and a gas heat source unit 50. Hot water supply system 10 supplies hot water to hot water tap 80 and bathtub 72. In this specification, supplying hot water to the bathtub 72 is referred to as hot water. In addition, hot water supply system 10 reheats bathtub water stored in bathtub 72.

  In the heat pump unit 40, the discharge side A of the compressor 41, the four-way valve 42, the heat medium passage 43a of the first heat exchanger 43, the expansion valve 44, the second heat exchanger 45, the four-way valve 42, and the return of the compressor 41 The side B is connected in order by a heat medium pipe 46, and the heat medium circulates in this order. The first heat exchanger 43 includes a heat medium passage 43a and a circulating water passage 43b. A fan 45a is installed near the second heat exchanger 45. The second heat exchanger 45 exchanges heat between the outside air sent by the fan 45a and the heat medium. A defrost path 47 is connected between a heat medium pipe 46 between the discharge side A of the compressor 41 and the four-way valve 42 and a heat medium pipe 46 between the expansion valve 44 and the second heat exchanger 45. ing. The defrosting path 47 is provided with a defrosting valve 47a.

  A circulation outward connection path 48 is connected to the inlet side of the circulating water flow path 43b of the first heat exchanger 43, and a circulation return path connection path 49 is connected to the outlet side. The circulation outbound connection path 48 is provided with an inlet thermistor 48a, and the circulation return path connection path 49 is provided with an outlet thermistor 49a. The inlet side thermistor 48a detects the temperature of the circulating water flowing into the circulating water channel 43b, and the outlet side thermistor 49a detects the temperature of the circulating water flowing out of the circulating water channel 43b. Further, a circulation pump 48b is provided in the circulation outbound connection path 48.

  The heat pump unit 40 includes a controller 40a. The controller 40a includes a CPU, a ROM, a RAM, and the like. Detection signals are input to the controller 40a from the inlet-side thermistor 48a and the outlet-side thermistor 49a. The controller 40a controls the operation of the compressor 41, the four-way valve 42, the expansion valve 44, the fan 45a, and the circulation pump 48b.

  Hot water storage unit 20 includes hot water storage tank 21 and mixer 24. A water supply path 22 for supplying tap water to the hot water storage tank 21 is connected to the bottom of the hot water storage tank 21. A pressure reducing valve 23 is provided near the tap water inlet 22 a of the water supply path 22. The mixing water supply path 26 of the mixer 24 is connected to the water supply path 22 downstream of the pressure reducing valve 23. The pressure reducing valve 23 adjusts the water supply pressure to the hot water storage tank 21 and the mixer 24 so as not to exceed a predetermined pressure.

  In the water supply path 22, a drain path 31 is connected to a downstream side of the connection part of the mixing water supply path 26. A drain valve 32 is provided in the middle of the drain path 31. The drain valve 32 can be manually opened and closed. When the drain valve 32 is opened, the water in the hot water storage tank 21 is drained to the outside through the drain path 31.

  One end of a circulation outward path 33 is connected to the bottom of the hot water storage tank 21, and one end of a circulation return path 34 is connected to the upper part of the hot water storage tank 21. The other end of the circulation forward path 33 is connected to a circulation forward path connection path 48 of the heat pump unit 40, and the other end of the circulation return path 34 is connected to a circulation return path connection path 49. The circulation outward path 33 is provided with an outward path thermistor 36. The outward path thermistor 36 detects the temperature of water flowing out of the hot water storage tank 21 to the circulation outward path 33.

  When the circulation pump 48b of the heat pump unit 40 is driven, water is sucked out from the lower part of the hot water tank 21 into the circulation forward path 33, flows through the circulation water flow path 43b, and returns to the upper part of the hot water tank 21 through the circulation return path 34. In this way, a circulation path between the hot water storage tank 21 and the heat pump unit 40 is configured. The circulation forward path 33, the circulation forward path connection path 48, the circulating water flow path 43b, the circulation return path connection path 49, and the circulation return path 34 are collectively referred to as a heat pump circulation path 90.

  An air release path 37 and a pressure release path 38 are connected near the hot water storage tank 21 in the middle of the circulation return path 34. The air vent path 37 is provided with an air vent valve 37a. The pressure release path 38 is provided with a relief valve 38a. The valve opening pressure of the relief valve 38 a is set slightly higher than the pressure adjustment value of the pressure reducing valve 23. When the pressure of the pressure reducing valve 23 cannot be adjusted, the relief valve 38a is opened to prevent the pressure in the hot water storage tank 21 from exceeding the pressure that can be withstand. In the hot water storage tank 21, an upper thermistor 39 is attached at a predetermined amount (for example, 30 liters) from the upper end. The upper thermistor 39 detects the temperature of the water above the hot water tank 21. In the middle of the circulation return path 34, near the hot water storage tank 21, there is a check valve 34 a that prevents the backflow in the circulation return path 34, that is, the flow of water in the circulation return path 34 from the hot water storage unit 20 toward the heat pump unit 40. Is arranged. The air vent path 37 and the pressure release path 38 are disposed closer to the heat pump unit 40 than the check valve 34a.

  The mixer 24 includes a hot water path 25, a mixing water supply path 26, a first mixing path 27, and a mixing valve 24a. The hot water path 25 is connected to an upper part of the hot water storage tank 21. The hot water path 25 is provided with a hot water flow sensor 25b and a hot water thermistor 25c. The hot water flow sensor 25b and the hot water thermistor 25c detect the flow rate and temperature of water flowing through the hot water path 25 per minute. The hot water flow sensor 25b can output a detected flow even when air flows in the hot water path 25. The hot water flow sensor 25b is, for example, an impeller flow meter. The flow rate sensors described below are the same flow rate sensors as the hot water flow rate sensor 25b unless otherwise specified. The mixing water supply path 26 is connected to the water supply path 22 as described above. In the mixing water supply path 26, a water supply flow rate sensor 26b and a water supply thermistor 26c are provided. The feedwater flow sensor 26b and the feedwater thermistor 26c detect the flow rate and temperature of tap water flowing through the mixing feedwater path 26 per minute.

  The hot water path 25 and the mixing water supply path 26 join at a mixing valve 24 a and are connected to a first mixing path 27. The mixing valve 24 a adjusts the flow rate of water or air flowing into the first mixing path 27 from the hot water path 25 and the mixing water supply path 26 by adjusting the valve opening. The mixing valve 24a is switchable between a fully open state, a half open state, and a fully closed state. Note that the valve opening of the mixing valve 24a may be linearly adjustable. When the mixing valve 24a is fully open, the mixing water supply path 26 is fully open and communicates with the first mixing path 27, and the hot water path 25 is closed and cut off from the first mixing path 27. On the other hand, when the mixing valve 24a is in the fully closed state, the mixing water supply path 26 is closed and cut off from the first mixing path 27, and the hot water path 25 is fully opened and communicates with the first mixing path 27. When the mixing valve 24a is in the half-open state, the mixing water supply path 26 is in a half-open state and communicates with the first mixing path 27, and the hot water path 25 is in a half-open state and communicates with the first mixing path 27. The first mixing path 27 includes a mixing thermistor 27a that detects the temperature of the mixed water flowing through the first mixing path 27.

  Hot water storage unit 20 further includes a hot water supply path 29 for a tap. A hot water supply thermistor 29a is provided in the hot water supply path 29 for the tap. A hot water tap 80 is connected to the end of the hot water supply path 29 for the tap. The hot water tap 80 is arranged in a bathroom, a washroom, a kitchen, or the like (in FIG. 1, these hot water taps 80 are represented by one). The middle of the first mixing path 27 and the middle of the tap hot water supply path 29 are connected by a hot water supply bypass path 28. The hot water supply bypass path 28 is provided with a bypass control valve 28a. When the bypass control valve 28a is open, the mixed water flowing through the first mixing path 27 flows from the hot water supply bypass path 28 to the tap hot water supply path 29, and when the bypass control valve 28a is closed, the mixed water flows through the first mixing path 27. The flowing mixed water flows to a second mixing path 52 of the gas heat source unit 50 described later.

  Hot water storage unit 20 includes controller 20a. The controller 20a includes a CPU, a ROM, a RAM, and the like. The controller 20a receives detection signals from the hot water thermistor 25c, the water supply thermistor 26c, the mixing thermistor 27a, the hot water thermistor 29a, the outward thermistor 36, the upper thermistor 39, the hot water flow sensor 25b, and the water supply flow sensor 26b. Further, the controller 20a controls the operations of the mixing valve 24a, the bypass control valve 28a, and the drain valve 32.

  The gas heat source unit 50 includes a water heater 51. The water heater 51 includes a heat exchanger 53 for hot water supply, a burner 54 for hot water supply, a heat exchanger 76 for additional heating, a burner 78 for additional heating, and the like. The inlet side of the hot water supply heat exchanger 53 is connected to the first mixing path 27 of the hot water storage unit 20 via the second mixing path 52. Mixed water flows into the hot water supply heat exchanger 53 through the second mixing path 52. In the second mixing path 52, a water input thermistor 52a, a hot water supply flow rate sensor 52b, and a water amount servo 52c are provided. The water input thermistor 52a and the hot water supply flow rate sensor 52b detect the temperature of water flowing through the second mixing path 52 and the flow rate per minute, respectively. The water amount servo 52c adjusts the flow rate of water flowing through the second mixing path 52. The hot water supply burner 54 is of a gas combustion type and heats the hot water supply heat exchanger 53. The outlet side of the hot water supply heat exchanger 53 is connected to the outlet side hot water supply path 55. The outlet side hot water supply path 55 branches into a hot water supply path 70 and a connection hot water supply path 60. The connection hot water supply path 60 is connected to the hot water supply path 29 for a tap of the hot water storage unit 20. The hot water flowing through the hot-water supply heat exchanger 53 is supplied from the hot-water tap 80 through the outlet-side hot-water supply path 55, the connection hot-water supply path 60, and the tap hot-water supply path 29. In the outlet-side hot water supply path 55, a can body thermistor 56 is provided near the outlet of the hot water supply heat exchanger 53, and a tapping thermistor 57 is provided downstream thereof. Hot water tapping thermistor 57 is arranged near heat exchanger 53 for hot water supply.

  The connection hot water supply path 60 is provided with a check valve 60a. The check valve 60a prevents a reverse flow in the connection hot water supply path 60, that is, a flow of water in the hot water supply path 29 from the hot water storage unit 20 toward the gas heat source unit 50.

  A heat source unit bypass path 58 is connected between the downstream side of the water amount servo 52 c in the second mixing path 52 and the can body thermistor 56 and the tapping thermistor 57 of the outlet side hot water supply path 55. A heat source unit bypass control valve 59 is provided at a connection between the second mixing path 52 and the heat source unit bypass path 58. By adjusting the opening of the heat source unit bypass control valve 59, a part of the water flowing through the second mixing path 52 flows into the heat source unit bypass path 58, and the flow rate thereof is adjusted.

  One end of a hot water path 70 is connected to the outlet side hot water supply path 55 downstream of the hot water supply thermistor 57. The other end of the hot water path 70 is connected to a bath circulation path 71. The hot water path 70 is provided with a hot water valve 70a, a hot water amount sensor 70b, and a check valve 70c. The bath circulation path 71 extends from the bathtub 72 to a junction with the hot water path 70, and from the junction with the hot water path 70 to the bathtub 72 via the reheating heat exchanger 76. An extended second flow path 76b is provided. The bath circulation path 71 circulates bath water between the bath 72 and the heat exchanger 76 for reheating. In the bath circulation path 71, a water pressure sensor 79, a bath pump 73, a water flow switch 74, a bath going thermistor 75, a reheating heat exchanger 76, and a bath returning thermistor 77 are provided in this order.

  When the hot water valve 70a is opened, the hot water flowing through the outlet-side hot water supply path 55 is supplied to the bathtub 72 from both the first flow path 76a and the second flow path 76b as indicated by the dashed arrows. The bath pump 73 allows the hot water to flow backward when not operating. The check valve 70c prevents a reverse flow in the hot water path 70, that is, a flow of water in the hot water path 70 from the gas heat source unit 50 side to the hot water storage unit 20 side.

  When the bath pump 73 is driven, the hot water in the bathtub 72 flows through the bath circulation path 71 as shown by the solid line arrow, and is heated by the gas combustion type reheating burner 78 when flowing through the reheating heat exchanger 76. Is done. The bath going out thermistor 75 detects the temperature of the bath water flowing into the bath circulation path 71 from the bath tub 72, and the bath return thermistor 77 receives the temperature of the bath water after being heated by the reheating heat exchanger 76. Is to be detected.

  The gas heat source unit 50 includes a controller 50a. The controller 50a includes a CPU, a ROM, a RAM, and the like. The controller 50a receives detection signals from a water input thermistor 52a, a can body thermistor 56, a hot water thermistor 57, a bath going out thermistor 75, a bath return thermistor 77, a hot water supply flow rate sensor 52b, a hot water quantity sensor 70b, a water flow switch 74, and a water pressure sensor 79. Is entered. The controller 50a controls the operations of the water volume servo 52c, the heat source device bypass control valve 59, the hot water valve 70a, the bath pump 73, the hot water supply burner 54, and the reheating burner 78.

  The controller 40a of the heat pump unit 40 can communicate with the controller 20a of the hot water storage unit 20. The controller 20a of the hot water storage unit 20 can communicate with the controller 50a of the gas heat source unit 50. The controller 50a of the gas heat source unit 50 can communicate with the remote controller 50b. The remote control 50b is provided with switches and buttons for operating the hot water supply system 10, a liquid crystal display for displaying the operation state of the hot water supply system 10, and the like, and inputs information set by the remote control 50b to the gas heat source unit 50. Is done. The user can set a hot water supply set temperature, a hot water set temperature, a hot water set water level, and the like using the remote controller 50b. The remote controller 50b has a built-in timer, and can hold information on the current time. When the current time is set on the remote controller 50b, a timer operation for performing the boiling operation at midnight or performing the hot water operation at a desired time can be performed.

  When the hot water supply system 10 is installed in a house, the heat pump unit 40, the hot water storage unit 20, and the gas heat source unit 50 are installed in an appropriate installation place according to the layout of the house, and paths between the units are connected. And a gas supply line to the gas heat source unit 50 are connected. Here, when connecting the hot water storage unit 20 and the gas heat source unit 50, the first mixing path 27 of the hot water storage unit 20 and the second mixing path 52 of the gas heat source unit 50 are connected via a first inter-unit path 102, The hot water supply path 29 for the tap of the hot water storage unit 20 and the connection hot water supply path 60 of the gas heat source unit 50 are connected via the second inter-unit path 104. The first inter-unit path 102 is a pipe extending from the tip of the first mixing path 27 to the outside of the hot water storage unit 20, and the second inter-unit path 104 is from the tip of the plug hot water supply path 29 to the outside of the hot water storage unit 20. It is a pipe extending. These pipes may be pipes connected to the hot water storage unit 20 from the shipping stage, or may be pipes connected to the hot water storage unit 20 by an operator during installation. When the hot water storage unit 20 is connected to the heat pump unit 40, the circulation forward path 33 and the circulation forward path connection path 48, and the circulation return path 34 and the circulation return path connection path 49 are connected via inter-unit paths (reference numerals are omitted). Is done.

  The hot water supply system 10 can perform a boiling operation, a defrosting operation, a hot water supply operation, a hot water operation, a reheating operation, and the like, as described below.

(Boiling operation)
In the boiling operation, the water stored in the hot water storage tank 21 is heated by the heat pump unit 40. In the heat pump unit 40, the heat medium that has been heated by being compressed by the compressor 41 heats the circulating water flowing through the circulating water flow path 43 b when flowing through the heat medium flow path 43 a of the first heat exchanger 43. The heat medium that has flowed out of the heat medium passage 43a is expanded and cooled by the expansion valve 44, and absorbs heat from outside air when flowing through the second heat exchanger 45 to increase the temperature. The heated heat medium flows into the compressor 41 and is compressed again to further increase the temperature. Further, in the heat pump unit 40, the circulation pump 48b is driven.

  By driving the circulation pump 48b, in the hot water storage unit 20, the water in the hot water storage tank 21 is sucked out from the bottom of the hot water storage tank 21 to the circulation forward path 33. The water sucked into the circulation outward path 33 is heated when passing through the circulating water flow path 43b of the first heat exchanger 43 of the heat pump unit 40, and the temperature rises. The warm water whose temperature has risen flows through the circulation return path 34 and is returned to the upper portion of the hot water storage tank 21. By performing this circulation, in the hot water storage tank 21, a temperature stratification in which a high-temperature layer is stacked on the cold water layer is formed. When the high-temperature hot water continues to be returned to the hot water storage tank 21, the thickness (depth) of the high-temperature layer gradually increases, and when the heat is completely stored, the high-temperature hot water is stored in the entire hot water storage tank 21. . Even if heat is not completely stored in the hot water storage tank 21, high-temperature hot water is sent out to the hot water path 25 connected to the upper part of the hot water storage tank 21 by forming the temperature stratification.

(Defrosting operation)
In the defrosting operation, the second heat exchanger 45 of the heat pump unit 40 is defrosted. As indicated by the dashed arrow, the high-temperature heat medium discharged from the compressor 41 by temporarily opening the defrost valve 47 a is caused to flow to the second heat exchanger 45 through the defrost path 47. When the high-temperature heat medium flows through the second heat exchanger 45, the second heat exchanger 45 is defrosted.

(Hot water supply operation)
When the sum of the detected flow rate of the hot water flow rate sensor 25b and the detected flow rate of the feed water flow rate sensor 26b exceeds a predetermined value, it is determined that hot water supply to the hot water tap 80 or the bathtub 72 has been started, and the hot water supply system 10 performs the heat storage hot water supply operation or heating. Perform hot water supply operation. When the detected water temperature of the upper thermistor 39 of the hot water storage tank 21 is equal to or higher than a reference temperature higher than the hot water supply set temperature set by the remote controller 50b by a certain temperature, the heat storage hot water supply operation is performed. In the heat storage / hot water supply operation, the bypass control valve 28a is opened and the water volume servo 52c is fully closed. The opening of the mixing valve 24a is adjusted so that the water temperature detected by the mixing thermistor 27a becomes the hot water supply set temperature. After the mixed water adjusted to the hot water supply set temperature flows through the first mixing path 27, the hot water is supplied from the hot water tap 80 through the hot water bypass path 28 and the hot water supply path 29 for taps.

  On the other hand, when the detected water temperature of the upper thermistor 39 is lower than the reference temperature, the heating and hot water supply operation is performed. In the heating and hot water supply operation, the bypass control valve 28a is fully closed, and the water amount servo 52c is set to a predetermined opening. Further, the opening of the mixing valve 24a is adjusted such that the water temperature detected by the mixing thermistor 27a is lower than the set hot water supply temperature by a temperature increase width by the hot water supply heat exchanger 53. The mixed water adjusted to a temperature lower than the set hot water supply temperature flows through the first mixing path 27, flows through the second mixing path 52 of the gas heat source unit 50, flows into the hot water supply heat exchanger 53, and has a hot water supply burner 54. Is heated. In the hot water supply heat exchanger 53, the water temperature detected by the can body thermistor 56 provided at the outlet of the hot water supply heat exchanger 53 is controlled to be 60 ° C. or higher. Thereby, generation | occurrence | production of the dew condensation water in piping can be suppressed. When the hot water supply set temperature is lower than 60 ° C., the opening of the heat source unit bypass control valve 59 is controlled such that the water temperature detected by the hot water supply thermistor 57 becomes the hot water supply set temperature. Part of the mixed water flowing through the second mixing path 52 flows into the outlet side hot water supply path 55 through the heat source device bypass path 58, and flows through the hot water supply heat exchanger 53 and the water of 60 ° C. or higher and the hot water supply heat exchanger 53. The low-temperature water that is not flowing is mixed with the hot water at the hot water supply set temperature. In this way, the hot water adjusted to the set hot water supply temperature is supplied from the hot water supply tap 80 through the outlet side hot water supply path 55, the connection hot water supply path 60, and the tap hot water supply path 29. Thereby, even when the hot water stored in the hot water storage tank 21 is completely consumed during the heat storage hot water supply operation, the hot water adjusted to the hot water supply set temperature can be continuously supplied.

(Hot water operation)
When the hot water supply operation is performed in the bathtub 72, the hot water supply operation is performed by replacing the hot water supply set temperature with the hot water supply set temperature. When the hot water request for the bathtub 72 is input to the remote controller 50b, the hot water valve 70a is opened to supply hot water to the bathtub 72. Hot water flowing from the outlet-side hot water supply path 55 through the hot water path 70 is supplied to the bathtub 72 through the first flow path 76a and the second flow path 76b, as shown by dashed arrows. Hot water corresponding to the hot water set temperature set by the remote controller 50b is supplied to the bathtub 72.

(Reheating operation)
When the temperature of the bathtub water stored in the bathtub 72 decreases, the bath pump 73 is operated to ignite the reheating burner 78. By this reheating operation, the bathtub water in the bathtub 72 is reheated, and returns to the hot water set temperature.

(Test run)
When the hot water supply system 10 is installed in a house as described above, a test operation such as an air release operation, a heat pump test operation, a hot water supply test operation, and a bath test operation, which will be described below, is performed. The user can use the hot water supply system 10 as usual. Hereinafter, a test operation performed in hot water supply system 10 will be described. The operator who performs the test operation may open the air release valve 37a before the start of the test operation, and may close the air release valve 37a after the end of the test operation. The trial run is started when the trial run start switch of the remote controller 50b is operated.

(Air venting operation)
In the test operation, first, an air release operation is executed. In the air venting operation, the hot water tank 21 is filled with water using water supplied from a water supply. The processing of the controller 20a of the hot water storage unit 20 executed during the air release operation will be described with reference to FIG.

  When the test run start switch is operated, in step S2, the controller 20a brings the mixing valve 24a into a half-open state. Thereby, the mixing water supply path 26 communicates with the first mixing path 27, and the hot water path 25 communicates with the first mixing path 27. Further, the controller 20a closes the bypass control valve 28a and the drain valve 32. Further, the controller 50a makes the water amount servo 52c fully open, and makes the heat source device bypass control valve 59 fully closed. Thus, in the hot water supply system 10, a path from the water supply to the hot water storage tank 21, a path from the water supply to the mixing valve 24a, and a path from the hot water storage tank 21 to the gas heat source unit 50 are communicated. Note that the controller 40a stops the circulation pump 48b. Thereby, water does not circulate in the heat pump unit 40.

  Next, in step S4, the controller 20a transmits a signal for causing the controller 50a to open the hot water valve 70a. Thereby, the controller 50a opens the hot water valve 70a, and the path from the gas heat source unit 50 to the bathtub 72 is communicated. As a result, water is supplied from the water supply to the hot water storage tank 21, and the air in the hot water storage tank 21 is separated from the hot water path 25, the first mixing path 27, the second mixing path 52, the hot water supply heat exchanger 53, and the outlet side hot water supply path 55. After passing through the hot water path 70, the air is exhausted to the bathtub 72. Note that the controller 20a starts timing when transmitting a signal for opening the hot water valve 70a.

  In step S5, the controller 20a determines whether or not the detected flow rate of the hot water flow rate sensor 25b is equal to or less than the first predetermined value for a first predetermined period (for example, 10 minutes). The first predetermined value is, for example, 0.5 liter per minute.

  For example, as shown in FIG. 1, when the hot water supply system 10 is installed in a house and the connection between the first unit path 102 and the second unit path 104 is correct, the hot water path 25 and the first mixed path 27 The air flows to the bathtub 72 via the second mixing path 52, the hot water supply heat exchanger 53, the outlet side hot water supply path 55, and the hot water path 70. As a result, the flow rate detected by the hot water flow rate sensor 25b becomes larger than the first predetermined value. On the other hand, for example, as shown in FIG. 3, when installing the hot water supply system 10 in a house, the first mixing path 27 and the connection hot water supply path 60 are incorrectly connected, and the hot water supply path 29 for stopper and the second mixing path Assume that 52 is connected incorrectly. In this case, the air in the hot water path 25 and the first mixing path 27 is blocked by the check valve 60 a of the connection hot water supply path 60. As a result, the detected flow rate of the hot water flow sensor 25b becomes substantially zero, and the detected flow rate of the hot water flow sensor 25b becomes equal to or less than the first predetermined value. In step S5, when the detected flow rate of the hot water flow rate sensor 25b is equal to or less than the first predetermined value for the first predetermined period (YES in step S5), the controller 20a determines whether the first unit path 102 and the second unit It is determined that the connection by the inter-path 104 is incorrect, and the process proceeds to step S50. In step S50, the controller 20a causes the liquid crystal display of the remote controller 50b to report erroneous connection information indicating that the connection between the first unit path 102 and the second unit path 104 is incorrect, and ends the test operation. .

  On the other hand, if it is determined in step S5 that the detected flow rate of the hot water flow rate sensor 25b is not equal to or less than the first predetermined value for the first predetermined period (NO in step S5), the controller 20a connects the first inter-unit path 102 to the first It is determined that the connection by the two-unit path 104 is correct, and the process proceeds to step S6. Note that the controller 20a starts counting time when water is detected by the feedwater flow sensor 26b. Further, the controller 20a executes a timing process according to the flow rate detected by the feedwater flow rate sensor 26b. Further, the controller 20a executes a timing process according to the flow rate detected by the hot water flow rate sensor 25b. Hereinafter, a path through which air in hot water storage tank 21 passes is referred to as an “exhaust path”. Since the mixing valve 24a is maintained in the half-open state, water is introduced into the exhaust path from the water supply via the mixing water supply path 26.

  Next, in step S6, the controller 20a determines whether or not the detected flow rate of the hot water flow rate sensor 25b is equal to or greater than the first threshold and the detected flow rate of the feed water flow rate sensor 26b is equal to or greater than the second threshold value. For example, the first threshold is 3 liters per minute and the second threshold is 2 liters per minute.

  When the detected flow rate of the hot water flow rate sensor 25b is equal to or more than the first threshold value and the detected flow rate of the water supply flow rate sensor 26b is equal to or more than the second threshold value (YES in S6), the process proceeds to step S16. On the other hand, if the detected flow rate of the hot water flow rate sensor 25b is less than the first threshold value, or if the detected flow rate of the water supply flow rate sensor 26b is less than the second threshold value (NO in S6), the process proceeds to step S8. When the detected flow rate of the hot water flow rate sensor 25b is equal to or greater than the first threshold value and the detected flow rate of the water supply flow rate sensor 26b is equal to or greater than the second threshold value, the water flows through the hot water path 25 and the mixing water supply path 26. And the water is stored in the hot water storage tank 21 to some extent.

  In step S8, the controller 20a determines whether or not the state in which the flow rate detected by the feedwater flow rate sensor 26b is less than the third threshold has continued for the second predetermined period. The third threshold is equal to or less than the second threshold, for example, 1 liter per minute. The second predetermined period changes depending on whether or not step S14 described later has been executed, that is, whether or not the mixing valve 24a has transitioned from the half-open state to the fully closed state. In step S8 before step S14 is executed, the second predetermined period is, for example, 60 minutes. In step S14, that is, in step S8 after the step of fully closing the mixing valve 24a is executed, The second predetermined period is shorter than the second predetermined period in step S8 before step S14 is executed, and is, for example, 10 minutes.

  When it is determined that the state in which the detected flow rate of the water supply flow rate sensor 26b is less than the third threshold has been continued for the second predetermined period (YES in step S8), the air venting operation is executed for a long period of time. In this case, the hot water storage tank 21 is not filled with water. In the case of YES in step S8, the controller 20a notifies the liquid crystal display of the remote controller 50b of an error indicating that the test run is not normally performed in step S10, and ends the test run. According to this configuration, the operator who performs the test operation can know that the test operation is not normally performed.

  On the other hand, when it is determined that the state in which the flow rate detected by the feedwater flow rate sensor 26b is less than the third threshold value has not been continued for the second predetermined period (NO in step S8), in step S12, the controller 20a determines the feedwater flow rate. It is determined whether or not the state where the detected flow rate of the sensor 26b is equal to or more than the third threshold has been continued for the third predetermined period. The third predetermined period is, for example, 10 minutes, and may change according to the capacity of the hot water storage tank 21. When the state in which the water supply flow rate sensor 26b is equal to or higher than the third threshold value has been continued for the third predetermined period (YES in step S12), the mixing valve 24a is half-opened, and a part of the water from the tap water is discharged. When the hot water is not supplied to the hot water storage tank 21, the water cannot be sufficiently stored in the hot water storage tank 21. If YES in step S12, in step S14, the mixing valve 24a is fully closed, and the process proceeds to step S15. On the other hand, when the state where the flow rate detected by the feedwater flow rate sensor 26b is equal to or higher than the third threshold value has not been continued for the third predetermined period (NO in step S12), the process returns to step S5.

  In step S15, the controller 20a determines whether or not the detected flow rate of the hot water flow rate sensor 25b is equal to or greater than a first threshold. When the detected flow rate of the hot water flow rate sensor 25b is equal to or more than the first threshold value (YES in S15), the process proceeds to step S16. On the other hand, if the flow rate detected by the hot water flow rate sensor 25b is not equal to or greater than the first threshold value (NO in S15), the process returns to step S8. The case where the detected flow rate of the hot water flow rate sensor 25b is equal to or more than the first threshold value is a case where water is stored in the hot water storage tank 21 to some extent.

  In step S16 executed in the case of YES in step S6 or the case of YES in step S15, controller 20a causes controller 40a to drive circulation pump 48b. That is, the circulating pump 48b is driven before the hot water storage tank 21 is filled with water to some extent and before the hot water storage tank 21 is filled with water. Thereby, water flows into the heat pump circulation path 90. As a result, the air contained in the heat pump circulation path 90 is exhausted to the bathtub 72. According to this configuration, the exhaust of the air contained in the hot water storage tank 21 and the exhaust of the air contained in the heat pump circulation path 90 can be performed simultaneously.

  Next, in step S18, the controller 20a determines that all the flow sensors disposed in the hot water supply system 10, that is, the hot water flow sensor 25b, the hot water flow sensor 26b, the hot water flow sensor 52b, and the hot water flow sensor 70b have stable detection flows. It is determined whether or not. Specifically, when the difference between the maximum value and the minimum value of the detected flow rates of the flow sensors 25b, 26b, 52b, and 70b for 30 seconds is a predetermined value, for example, 2 liters per minute or less, the controller 20a It is determined that the flow rates detected by the flow rate sensors 25b, 26b, 52b, and 70b are stable (YES in step S18), and the process proceeds to step S20. On the other hand, when any of the difference between the maximum value and the minimum value of the detected flow rate of the flow rate sensors 25b, 26b, 52b, 70b is larger than 2 liters per minute, the detection of each flow rate sensor 25b, 26b, 52b, 70b It is determined that the flow rate is not stable (NO in step S18). When any of the detected flow rates of the flow rate sensors 25b, 26b, 52b, and 70b is not stable, there is a high possibility that air remains in the path where the unstable sensor is arranged. If NO in step S18, the process proceeds to step S8.

  In step S20, the controller 20a determines whether or not the detected flow rate of the hot water flow rate sensor 25b is the fourth threshold value and has been continued for the fourth predetermined period. The fourth threshold is, for example, 3 liters per minute and may be equal to the first threshold. The fourth predetermined period is, for example, 30 seconds. When the flow rate detected by the hot water flow sensor 25b is the fourth threshold value and has been continued for the fourth predetermined period (YES in step S20), the hot water tank 21 is filled with water, and the hot water path 25 Is supplied with water. In this case, the process proceeds to S22. On the other hand, when the flow rate detected by the hot water flow rate sensor 25b is the fourth threshold value and has not been continued for the fourth predetermined period (NO in step S20), the process proceeds to S8.

  In step S22, the controller 20a adds a detection flow rate of the hot water flow rate sensor 26b to a detection flow rate of the hot water flow rate sensor 25b and subtracts a detection flow rate of the hot water supply flow rate sensor 52b (hereinafter, referred to as a “calculated value”). At the fifth threshold or less, it is determined whether or not the fifth predetermined period has been continued. The fifth threshold is, for example, 4 liters per minute. The fifth predetermined period is, for example, 30 seconds, and may be equal to the fourth predetermined period. The case where the calculated value is equal to or less than the fifth threshold value and is continued for the fifth predetermined period is when the amount of water flowing in the hot water storage unit 20 and the amount of water passing through the gas heat source unit 50 are substantially equal, that is, This is a case where the air supplied from the hot water storage unit 20 to the gas heat source unit 50 is almost exhausted. In this case, the process proceeds to S24. On the other hand, when the flow rate detected by the hot water flow rate sensor 25b is the fifth threshold value and has not been continued for the fifth predetermined period (NO in step S22), the process proceeds to S8.

  In step S24, the controller 20a continues the sixth predetermined period when the detected flow rate of the hot water flow rate sensor 25b is equal to or more than a value obtained by multiplying the detected flow rate of the feed water flow rate sensor 26b by a predetermined ratio (hereinafter, referred to as a “multiplied value”). It is determined whether or not. The predetermined ratio is, for example, 0.6. The sixth predetermined period is, for example, 30 seconds, and may be equal to the fifth predetermined period. When the flow rate detected by the hot water flow sensor 25b is equal to or more than the multiplied value and has been continued for the sixth predetermined period (YES in step S24), the amount of water supplied from the hot water storage tank 21 to the hot water path 25 and the mixing water supply from the tap water This is a case where the amount of water supplied to the passage 26 is substantially equal, that is, a case where the hot water tank 21 is filled with water. If YES in step S24, the air release operation ends. According to this configuration, the hot water tank 21 can be appropriately filled with water. On the other hand, if the detected flow rate of the hot water flow rate sensor 25b is equal to or larger than the multiplied value and has not been continued for the sixth predetermined period (NO in step S24), the process proceeds to S8. The controller 40a stops the circulation pump 48b when it determines that the air from the circulation pump 48b has ceased. That is, when it is determined that the air bleeding of the heat pump circulation path has been completed, the circulation pump 48b is stopped. Note that, in order to more reliably release air from the heat pump circulation path, the circulation pump 48b may be driven for a predetermined time after determining that the air from the circulation pump 48b has ceased. The predetermined time is a value that changes according to the length of the heat pump circulation path, and is, for example, 2 minutes.

(Heat pump trial run)
When the air release operation ends, the heat pump test operation is performed. In the heat pump test operation, the water stored in the hot water storage tank 21 is circulated and heated by the heat pump unit 40, as in the boiling operation in the normal operation. In the heat pump trial operation, it is determined whether or not heat storage in the hot water storage tank 21 by the heat pump unit 40 is normally performed.

(Test run of hot water supply)
In the hot water supply test operation, the hot water stored in the hot water storage tank 21 is adjusted to the hot water supply set temperature by the mixer 24 and supplied to the hot water tap 80 similarly to the heat storage hot water supply test operation in the normal operation. In the hot water supply test operation, it is determined whether the temperature adjustment by the mixer 24 is performed normally.

(Bath trial run)
In the bath trial operation, the same operation as the hot water operation and the reheating operation in the normal operation is performed. In the bath trial run, it is determined whether the hot water supply to the bathtub 72 at the set hot water supply temperature and the reheating of the bathtub water in the bathtub 72 are performed normally. In the bath trial operation, the size of the bathtub 72 is determined based on the amount of water supplied to the bathtub 72 obtained by integrating the flow rates detected by the hot water amount sensor 70b and the water level of the bathtub 72 calculated from the water pressure detected by the water pressure sensor 79. Is grasped.

  As is apparent from the above description, the hot water supply system 10 executes the determination in step S5 to ensure that the connection between the first unit path 102 and the second unit path 104 is incorrect during the air release operation. Can be determined. In addition, when the detected flow rate of hot water flow rate sensor 25b is equal to or less than the first predetermined value for the first predetermined period (YES in S5), hot water supply system 10 sets first inter-unit path 102 and second inter-unit path. It is determined that the connection by 104 is incorrect. Thus, even when the detected flow rate is less than or equal to the predetermined value is intermittent, the reliability of the erroneous connection determination can be improved as compared with the comparative example in which the erroneous connection is determined. In a modification, this comparative example may be adopted.

(Correspondence)
In the present embodiment, the hot water storage unit 20, the heat pump unit 40, and the gas heat source unit 50 are examples of a “hot water storage unit”, a “first heat source unit”, and a “second heat source unit”, respectively. The hot water storage tank 21, the water supply path 22, the hot water path 25, the hot water supply path 29 for the tap, and the hot water flow rate sensor 25b correspond to a “hot water tank”, a “water supply path”, a “hot water path”, a “first hot water supply path”, and a “hot water supply”, respectively. Flow sensor ". The second mixing path 52, the hot water supply heat exchanger 53, and the outlet side hot water supply path 55 are examples of a "heating path". The hot water path 70, the connection hot water supply path 60, the hot water supply flow rate sensor 52b, the hot water supply valve 70a, and the check valve 60a are respectively a “second hot water supply path”, a “third hot water supply path”, a “heating flow rate sensor”, and a “open / close”. Valve "and" check valve ". The first inter-unit path 102 and the second inter-unit path 104 are examples of the “first inter-unit path” and the “second inter-unit path”, respectively.

(Second embodiment)
The processing of the air release operation of this embodiment is the same as that of the first embodiment except for the content of step S5. In this embodiment, the controller 20a determines in step S5 that the detected flow rate of the hot water flow rate sensor 25b is equal to or less than the first predetermined value and that the detected flow rate of the hot water supply flow rate sensor 52b is equal to or less than the second predetermined value. Determine whether or not it is continuing. The second predetermined value is, for example, 0.5 liter per minute and may be equal to the first predetermined value.

  It is assumed that the connection between the unit paths 102 and 104 is incorrect as shown in FIG. In this case, the air in the hot water path 25 and the first mixing path 27 is blocked by the check valve 60 a of the connection hot water supply path 60. Further, since the air in the passages 25 and 27 is blocked by the check valve 60 a, no air flows from the connection hot water supply passage 60 to the second mixing passage 52. As a result, the detected flow rate of the hot water supply flow rate sensor 52b becomes substantially zero, and the detected flow rate of the hot water supply flow rate sensor 52b becomes equal to or less than the second predetermined value. By executing the determination in step S5, it can be determined that the connection by the inter-unit paths 102 and 104 is incorrect. Further, by determining whether or not each of the two detected flow rates of the two flow sensors is equal to or less than the predetermined value for the first predetermined period, the reliability of the determination of the erroneous connection is further improved. be able to.

  Further, as described above, the hot water flow sensor 25b is a sensor that detects the flow rate of water flowing through the hot water path 25, and is not a sensor that originally detects the flow rate of air. Therefore, even when the connection between the unit paths 102 and 104 is correct and air flows through the hot water path 25, the detected flow rate of the hot water flow sensor 25b becomes equal to or less than the first predetermined value, and the controller 20a erroneously determines that the connection is incorrect. there's a possibility that. On the other hand, in the present embodiment, by using the detection flow rates of not only one hot water flow sensor 25b but also two flow sensors 25b and 52b, the second embodiment uses the detection flow rate of one flow sensor. As compared with the first embodiment, it is possible to increase the reliability of the erroneous connection determination.

(Third embodiment)
The processing of the air release operation of this embodiment is the same as that of the first embodiment except for the content of step S5. In the present embodiment, the controller 20a determines in step S5 that the detected flow rate of the hot water flow rate sensor 25b is equal to or less than the first predetermined value and that the detected flow rate of the supply water flow rate sensor 26b is equal to or less than the third predetermined value. Determine whether or not it is continuing. The third predetermined value is, for example, 0.5 liter per minute, and may be equal to the first predetermined value.

  For example, as shown in FIG. 1, when the hot water supply system 10 is installed in a house and the connection by the inter-unit paths 102 and 104 is correct, the air in the hot water path 25 and the air in the first mixing path 27 are removed from the second mixing path. Flow to 52. Therefore, the water in the water supply path 22 flows not only in the hot water storage tank 21 but also in the mixing water supply path 26. As a result, the flow rate detected by the water supply flow rate sensor 26b becomes larger than the third predetermined value. On the other hand, it is assumed that the connection between the unit paths 102 and 104 is wrong as shown in FIG. In this case, the air in the hot water path 25 and the first mixing path 27 is blocked by the check valve 60 a of the connection hot water supply path 60. Further, the air in the passages 25 and 27 is blocked by the check valve 60a, so that the air stagnates in the warm water passage 25 and air or water flows from the mixing water supply passage 26 which merges with the warm water passage 25 to the warm water passage 25. It hardly flows. As a result, the detected flow rate of the feedwater flow sensor 26b becomes substantially zero, and the detected flow rate of the feedwater flow sensor 26b becomes equal to or less than the third predetermined value. By executing the determination in step S5, it can be determined that the connection by the inter-unit paths 102 and 104 is incorrect. Further, as described above, by determining whether or not each of the two detected flow rates of the two flow rate sensors is equal to or less than the predetermined value for the first predetermined period, it is possible to further determine the erroneous connection. Reliability can be improved.

  Further, for example, a comparative example in which it is determined in step S5 that only the flow rate detected by the feedwater flow rate sensor 26b is equal to or less than the third predetermined value is determined. In this comparative example, even if the connection between the unit paths 102 and 104 is correct, if the hot water storage tank 21 has a lower pressure than the mixing water supply path 26, water flows into the hot water storage tank 21 and the mixing water supply path 26 Water may not flow through In this case, the flow rate detected by the feedwater flow rate sensor 26b becomes equal to or less than the third predetermined value, and there is a possibility that the controller 20a is erroneously determined to be incorrectly connected. On the other hand, in the present embodiment, the configuration using the detected flow rate of one flow sensor by using the detected flow rates of the two flow rate sensors 25b and 26b (that is, the comparative example or the first embodiment) Compared with Example), it is possible to enhance the reliability of the determination of the incorrect connection.

(Correspondence)
The mixing water supply path 26 and the supply water flow sensor 26b are examples of a “cold water path” and a “cold water flow sensor”, respectively.

(Fourth embodiment)
The processing of the air release operation of this embodiment is the same as that of the first embodiment except for the content of step S5. In this embodiment, the controller 20a determines in S5 that the detected flow rate of the hot water flow rate sensor 25b is equal to or less than the first predetermined value, and that the detected flow rate of the hot water supply flow rate sensor 52b is equal to or less than the second predetermined value; It is determined whether or not the detected flow rate of the water supply flow rate sensor 26b is equal to or less than the third predetermined value for 10 minutes.

  As described above, when the connection between the unit paths 102 and 104 is incorrect, the detected flow rates of the hot water flow rate sensor 25b, the hot water flow rate sensor 52b, and the feed water flow rate sensor 26b become substantially zero, and Is less than each predetermined value. By executing the processing in step S5, it can be determined that the connection by the inter-unit paths 102 and 104 is incorrect. In particular, by using the detected flow rates of the three flow sensors 25b, 52b, and 26b, compared to the first to third embodiments that use the detected flow rates of one or two flow sensors, incorrect connection is achieved. The reliability of the judgment can be improved. Further, as described above, by determining whether or not each of the three detected flow rates of the three flow rate sensors is equal to or less than the predetermined value for the first predetermined period, it is possible to further determine the erroneous connection. Reliability can be improved.

  As mentioned above, although each Example was described in detail, these are only illustrations and do not limit a claim. The technology described in the claims includes various modifications and alterations of the specific examples illustrated above. Modifications of the above embodiments are listed below.

  In each of the above embodiments, hot water supply system 10 determines whether or not each detected flow rate of each flow sensor is equal to or less than each predetermined value for the first predetermined period. Alternatively, hot water supply system 10 may determine whether each detected flow rate of each flow rate sensor at a predetermined timing is equal to or less than each predetermined value.

  In the modification, the mixing valve 24a may not be provided. In this case, the hot water path 25 may be provided with a hot water control valve for adjusting the flow rate of the hot water flowing from the hot water storage tank 21 to the hot water path 25. Further, the mixing water supply path 26 may be provided with a water supply control valve for adjusting the flow rate of tap water flowing through the mixing water supply path 26. The controller 20a may adjust the mixing ratio in the first mixing path 27 using the hot water control valve and the water supply control valve.

10: Hot water supply system, 20: Hot water storage unit, 20a: Controller, 21: Hot water tank, 22: Water supply path, 22a: Tap water inlet, 23: Pressure reducing valve, 24: Mixer, 24a: Mixing valve, 25: Hot water path, 25b: hot water flow sensor, 25c: hot water thermistor, 26: mixing water supply path, 26b: water supply flow sensor, 26c: water supply thermistor, 27: first mixing path, 27a: mixing thermistor, 28: hot water supply bypass path, 28a: bypass Control valve, 29: hot water supply path for tap, 29a: hot water supply thermistor, 31: drain path, 32: drain valve, 33: circulation forward path, 34: circulation return path, 34a: check valve, 36: forward path thermistor, 37: air release path 37a: air vent valve, 38: pressure release path, 38a: relief valve, 39: upper thermistor, 40: heat pump unit, 40a: Troller, 41: compressor, 42: four-way valve, 43: first heat exchanger, 43a: heat medium flow path, 43b: circulating water flow path, 44: expansion valve, 45: second heat exchanger, 45a: fan, 46: heat medium pipe, 47: defrost path, 47a: defrost valve, 48: circulation forward path connection path, 48a: inlet side thermistor, 48b: circulation pump, 49: circulation return path connection path, 49a: outlet side thermistor, 50 : Gas heat source unit, 50a: controller, 50b: remote controller, 51: water heater, 52: second mixing path, 52a: incoming water thermistor, 52b: hot water supply flow sensor, 52c: water volume servo, 53: hot water supply heat exchanger, 54 : Hot water supply burner, 55: outlet side hot water supply path, 56: can body thermistor, 57: hot water supply thermistor, 58: heat source equipment bypass control valve, 59: heat source equipment bypass control valve, 60: connection hot water supply path, 6 a: check valve, 70: hot water path, 70a: hot water valve, 70b: hot water quantity sensor, 70c: check valve, 71: bath circulation path, 72: bathtub, 73: bath pump, 74: water flow switch , 75: bath going thermistor, 76: heat exchanger for reheating, 76a: first flow path, 76b: second flow path, 77: bath return thermistor, 78: burner for reheating, 79: water pressure sensor, 80: Hot water tap, 90: heat pump circulation path, 102: path between first units, 104: path between second units

Claims (4)

A hot water supply system including a hot water storage unit, a first heat source unit, and a second heat source unit,
The hot water storage unit,
A hot water storage tank for storing water,
A water supply path connected to the lower part of the hot water tank,
A hot water path connected to the top of the hot water tank,
A first hot water supply path connected to the hot water tap,
A hot water flow sensor provided in the hot water path,
With
The first heat source unit heats water sent from the hot water storage tank, and sends out the heated water to the hot water storage tank.
The second heat source unit includes:
A heating path connected to the hot water path of the hot water storage unit,
A second hot water supply path branched from the heating path;
A third hot water supply path branched from the heating path and connected to the first hot water supply path;
A heating flow sensor provided in the heating path,
An on-off valve provided in the second hot water supply path;
A check valve provided in the third hot water supply path;
With
The hot water path of the hot water storage unit and the heating path of the second heat source unit are connected via a first inter-unit path,
The first hot water supply path of the hot water storage unit and the third hot water supply path of the second heat source unit are connected via a second inter-unit path,
The hot water supply system,
Opening the on-off valve to supply water from the water supply path to the hot water storage tank, and bleed air from the hot water storage tank through the hot water path, the heating path, and the second hot water supply path. Driving can be performed,
During the air venting operation, if one of the detected values of the hot water flow rate sensor and the heating flow rate sensor is equal to or less than a first predetermined value, the connection by the first unit path and the second unit path is erroneously performed. Hot water supply system that determines that there is.   At the time of the air release operation, one of the detected values of the hot water flow sensor and the heating flow sensor is equal to or less than the first predetermined value, and the other detected value of the hot water flow sensor and the heating flow sensor is the second detection value. The hot water supply system according to claim 1, wherein when it is equal to or less than a predetermined value, it is determined that the connection between the first unit path and the second unit path is incorrect. The hot water storage unit further includes a cold water path that branches off from the water supply path and joins the hot water path,
In the cold water path, a cold water flow sensor is provided,
At the time of the air release operation, when one of the detection values of the hot water flow sensor and the heating flow sensor is equal to or less than the first predetermined value, and the detection value of the cold water flow sensor is equal to or less than a third predetermined value. The hot water supply system according to claim 1, wherein it is determined that the connection between the first unit path and the second unit path is incorrect. At the time of the air release operation, when the detection value of each flow sensor is equal to or less than each predetermined value for a predetermined period, the connection by the first inter-unit path and the second inter-unit path is incorrect. The hot water supply system according to any one of claims 1 to 3, wherein the hot water supply system determines that:

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