JP6514936B2 - Thermal equipment - Google Patents

Description

  The present invention relates to thermal equipment.

  Patent Document 1 discloses a hot water storage device capable of automatically watering a circulating heating circuit at the time of a test operation. Patent Document 2 discloses a hot water storage hot water supply apparatus capable of automatically watering a circulating heating circuit in parallel with water filling of a hot water storage tank at the time of test operation.

JP, 2013-210117, A JP, 2013-224797, A

  In the thermal equipment provided with a tank for storing water, a heating device for heating water, a circulation path for circulating water between the tank and the heating device, and a control device, freezing of piping is not performed when winter is not used for a long time The user may drain the water to prevent it. In addition, in such a thermal device, after water filling at the time of construction, there is also a case where a construction company once drains water. In such a thermal device, if the heating device starts heating before draining again after draining, the heating device may become empty and damage the device. is there.

  The present specification provides a thermal device that can prevent the heating device from being exhausted.

The thermal apparatus disclosed herein comprises a control unit having a tank for storing water, a heating unit for heating water, a circulation path for circulating water between the tank and the heating unit, and a non-volatile storage unit. Controller is a feasible the water filling operation for performing water filling to the circulation path and the tank, the non-volatile storage device, be capable of storing that the drainage from the circulation path is performed, when the power is turned on When it is stored that the non-volatile storage device has been drained, it is configured to prohibit the heating of the water by the heating device until the completion of the water filling operation.

In the above thermal device, when the non-volatile storage device in the control device stores that the water has been drained, the heating device does not start until the completion of the water filling operation, thus preventing the heating device from being idle can do.

  The above thermal device is capable of performing a drainage operation for draining water from the circulation path, and the control device is configured to perform the drainage operation on the non-volatile storage device when the thermal device performs the drainage operation. It may be stored that the drainage has been performed.

  According to such a configuration, since the water removal operation is almost automatic, the operation can be simplified and the water can be reliably removed. In addition, since the control device automatically stores in the non-volatile storage device that drainage has been performed, there is no need for the user or the contractor to input to the control device that drainage has been performed.

  In the above thermal device, the control device prohibits the heating of the water by the heating device until the predetermined time elapses, when the non-volatile storage device does not store that the water is drained when the power is turned on. You may

Even when drainage is not stored in the non-volatile storage device, the user or the contractor may actually perform drainage manually. According to such a configuration, the heating device does not start heating water for a certain period of time, even when the non-volatile storage device does not store that drainage has been performed when the power is turned on. It is possible to prevent When the user or the contractor manually drains the water, it is considered that the user or the contractor will perform the water filling operation without much time after turning on the power, so the water by the heating device If the heating is inhibited for a predetermined time (for example, the time required for the completion of the water filling operation to be performed by the manual water filling operation) , it is possible to prevent the heating device from being exhausted.

  According to the thermal device disclosed in the present specification, it is possible to prevent the heating device from being blown up.

The schematic diagram of the hot-water supply system 10. FIG. FIG. 7 is a flowchart showing an operation of the hot water supply system 10 when the water removal mode is selected. FIG. 7 is a flowchart showing an operation of the hot water supply system 10 when the power is turned on.

(Example) The hot water supply system 10 of an Example is demonstrated with reference to drawings. FIG. 1 is a schematic view of the hot water supply system 10, and the flows of water and refrigerant are indicated by arrows. As shown in FIG. 1, the hot water supply system 10 includes a tank unit 20, a heat pump unit 40, and a gas heat source unit 50. The hot water supply system 10 supplies hot water to the hot water supply tap 80 and the bathtub 72. In the present specification, hot water supply to the bathtub 72 is referred to as hot water. In addition, the hot water supply system 10 discharges the bathtub water stored in the bathtub 72.

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

  A circulation forward path 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. An inlet side thermistor 48 a is provided in the circulation forward path connection path 48, and an outlet side thermistor 49 a is provided in the circulation return path connection path 49. The inlet side thermistor 48a detects the temperature of the circulating water flowing into the circulating water flow path 43b, and the outlet side thermistor 49a detects the temperature of the circulating water flowing out of the circulating water flow path 43b. Further, a circulation pump 48 b and a water drainage path 90 are provided in the circulation forward path connection path 48. The drainage path 90 is provided with a drainage valve 90a. When the drain valve 90 a is opened, the water present in the circulation forward connection path 48 is drained to the outside through the water drain path 90.

  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 also controls the operation of the compressor 41, the four-way valve 42, the expansion valve 44, the fan 45a, the circulation pump 48b, and the drainage valve 90a. The controller 40a is provided with a preparation operation switch 40c for starting the preparation operation of the heat pump unit 40.

  The tank unit 20 includes a hot water storage tank 21 and a 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. In the vicinity of the tap water inlet 22 a of the water supply path 22, a pressure reducing valve 23 and a water removing path 104 are provided. The mixing water supply path 26 of the mixer 24 is connected to the water supply path 22 at the downstream side of the pressure reducing valve 23. A water supply control valve 26 a is provided in the mixing water supply path 26. The pressure reducing valve 23 regulates the water supply pressure to the hot water storage tank 21 and the mixer 24. When the hot water in the hot water storage tank 21 decreases or the water supply control valve 26 a opens, the downstream pressure of the pressure reducing valve 23 decreases. The pressure reducing valve 23 opens when the downstream pressure decreases, and tries to maintain the pressure at a predetermined pressure regulation value. Therefore, when the hot water in the hot water storage tank 21 decreases or the water supply control valve 26a of the mixer 24 is opened, tap water is supplied to these. Moreover, the drainage path 104 is provided with a drainage valve 104a. When the drain valve 104 a is opened, the water present in the water supply path 22 is drained to the outside through the water drain path 104.

  In the water supply path 22, a drainage path 31 is connected to the downstream side of the connection portion of the mixing water supply path 26. A drainage valve 32 is provided in the middle of the drainage path 31. The drain valve 32 can be opened and closed manually. 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 the circulation forward path 33 is connected to the bottom of the hot water storage tank 21, and one end of the 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 the 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 the circulation return path connection path 49. In the circulation forward path 33, an outward trip thermistor 36 and a water drain path 106 are provided. The outward path thermistor 36 detects the temperature of the water flowing out of the hot water storage tank 21 to the circulation outward path 33. The water drain path 106 is provided with a drain valve 106 a. When the drain valve 106 a is opened, the water present in the circulation forward path 33 is drained to the outside through the drain path 106.

  When the circulation pump 48b of the heat pump unit 40 is driven, water is sucked from the lower part of the hot water storage tank 21 to the circulation forward passage 33, and this water flows through the circulating water flow passage 43b and is returned to the upper part of the hot water storage tank 21 through the circulation return passage 34. Thus, a circulation path between the hot water storage tank 21 and the heat pump unit 40 is configured.

  In the middle of the circulation return path 34, the water removal path 108, the air removal path 37, and the pressure release path 38 are connected. An air vent valve 37 a is provided in the air vent path 37. The pressure release path 38 is provided with a relief valve 38 a. The valve opening pressure of the relief valve 38 a is set to be slightly larger than the pressure adjustment value of the pressure reducing valve 23. When the pressure regulation of the pressure reducing valve 23 becomes impossible, the relief valve 38a is opened to prevent the pressure in the hot water storage tank 21 from exceeding the pressure that can withstand pressure. 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 thereof. The upper thermistor 39 detects the water temperature in the upper portion of the hot water storage tank 21. The drainage path 108 is provided with a drainage valve 108 a. When the drain valve 108 a is opened, the water present in the circulation return path 34 is drained to the outside through the drain path 108.

  The mixer 24 includes a hot water path 25, a mixing water supply path 26 and a first mixing path 27. The hot water path 25 is connected to the upper portion of the hot water storage tank 21. The hot water path 25 is provided with a hot water control valve 25a, a hot water flow sensor 25b, and a hot water thermistor 25c. The hot water control valve 25 a adjusts the flow rate of hot water flowing from the hot water storage tank 21 to the hot water path 25. The hot water flow rate sensor 25 b and the hot water thermistor 25 c detect the flow rate and temperature of the hot water flowing through the hot water path 25. The mixing water supply path 26 is connected to the water supply path 22 as described above. The mixing water supply path 26 is provided with the above-described water supply control valve 26a, a water supply flow rate sensor 26b, and a water supply thermistor 26c. The water supply control valve 26 a adjusts the flow rate of tap water flowing through the mixing water supply path 26. The feed water flow rate sensor 26 b and the feed water thermistor 26 c detect the flow rate and temperature of the tap water flowing through the mixing feed water path 26.

  The hot water path 25 and the mixing water supply path 26 join together and are connected to the first mixing path 27. The first mixing path 27 is provided with a mixing thermistor 27 a that detects the temperature of the mixed water flowing through the first mixing path 27.

  The tank unit 20 further includes a first hot water supply path 29. In the first hot water supply path 29, a water removal path 100, a hot water supply thermistor 29a, and a water removal path 102 are provided. A drainage valve 100 a is provided in the drainage path 100. When the drain valve 100 a is opened, the water present in the second hot water supply path 55 and the first hot water supply path 29 is drained to the outside through the water drain path 100. Further, the drainage path 102 is provided with a drainage valve 102 a. When the drain valve 102 a is opened, the water present in the hot water supply bypass path 28 and the first hot water supply path 29 is drained to the outside through the water drain path 102. A hot water supply tap 80 is connected to the tip of the first hot water supply path 29. The hot water supply tap 80 is disposed in a bathroom, a washroom, a kitchen or the like (in FIG. 1, the plurality of hot water supply taps 80 are represented by one). The hot water supply bypass path 28 connects the middle of the first mixing path 27 and the middle of the first hot water supply path 29. A bypass control valve 28 a is provided in the hot water supply bypass path 28. 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 first hot water supply path 29, and when the bypass control valve 28a is closed, the first mixing path 27 The mixed water that has flowed flows to a second mixing path 52 of the gas heat source unit 50 described later. On the side of the first mixing path 27 where the first mixing path 27 is connected to the second mixing path 52, there is a water removal path 98. A drainage valve 98a is provided in the drainage path 98. When the drain valve 98 a is opened, the water present in the first mixing path 27 and the second mixing path 52 is drained to the outside through the water draining path 98.

  The tank unit 20 includes a controller 20a. The controller 20a includes a CPU, a ROM, a RAM, and the like. Detection signals are input to the controller 20a from the hot water thermistor 25c, the water supply thermistor 26c, the mixing thermistor 27a, the hot water supply thermistor 29a, the forward path thermistor 36, the upper thermistor 39, the hot water flow sensor 25b, and the water supply flow sensor 26b. The controller 20a also includes a warm water control valve 25a, a water supply control valve 26a, a bypass control valve 28a, a drainage valve 32, an air vent valve 37a, a drainage valve 98a, a drainage valve 100a, a drainage valve 102a, a drainage valve 104a, a drainage valve 106a, drainage Control the operation of the valve 108a.

  The gas heat source unit 50 includes a water heater 51. The water heater 51 includes a hot water supply heat exchanger 53, a hot water supply burner 54, a reheating heat exchanger 76, a reheating burner 78, and the like. The inlet side of the hot water supply heat exchanger 53 is connected to the first mixing path 27 of the tank unit 20 via the second mixing path 52. The mixed water flows into the hot water supply heat exchanger 53 through the second mixing path 52. The second mixing path 52 is provided with a water removal path 96, a water inlet thermistor 52a, a hot water detection sensor 52b, and a water level servo 52c. A drainage valve 96 a is provided in the drainage path 96. When the drain valve 96 a is opened, the water present in the second mixing channel 52 is drained to the outside through the water draining channel 96. The incoming water thermistor 52a and the hot water detection sensor 52b respectively detect the temperature and flow rate of the water flowing through the second mixing path 52. The water amount servo 52 c adjusts the flow rate of water flowing through the second mixing path 52. The hot water supply burner 54 is 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 first hot water supply path 29 via the second hot water supply path 55. The hot water having flowed through the hot water supply heat exchanger 53 is supplied with hot water from the hot water supply tap 80 through the second hot water supply path 55 and the first hot water supply path 29. In the second hot water supply path 55, a can body thermistor 56 is provided in the vicinity of the outlet of the hot water supply heat exchanger 53, and a hot water discharge thermistor 57 is provided downstream thereof. The hot water discharge thermistor 57 is disposed in the vicinity of the hot water supply heat exchanger 53.

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

  A drain path 94 is provided downstream of the hot water discharge thermistor 57 of the second hot water supply path 55. The water drain path 94 is provided with a drain valve 94 a. When the drain valve 94 a is opened, the water present in the second hot water supply passage 55 and the hot water passage 70 is discharged to the outside through the water discharge passage 94. Further, one end of a hot water passage 70 is connected to the downstream side of the hot water discharge thermistor 57. The other end of the hot water passage 70 is connected to a return flow passage 76 a of a bath circulation passage 71 described later. The hot water passage 70 is provided with a hot water valve 70 a and a hot water amount sensor 70 b. The bath circulation path 71 includes a return flow path 76a extending from the bath tub 72 to the reheating heat exchanger 76, and a forward flow path 76b extending from the reheating heat exchanger 76 to the bath tub 72. The bath circulation path 71 circulates bath water between the bath 72 and the reheating heat exchanger 76. In the bath circulation path 71, a bath pump 73, a water pressure sensor 79, a water flow switch 74, a bath return thermistor 75, a reheating heat exchanger 76, and a bath passing thermistor 77 are sequentially provided.

  When the hot water filling valve 70a is opened, the hot water flowing through the second hot water supply path 55 is supplied to the bath tub 72 from both the return flow path 76a and the forward flow path 76b, as indicated by the broken arrows. When not operating, the bath pump 73 allows the hot water to flow backward.

  When the bath pump 73 is driven, the hot water in the bath tub 72 flows through the bath circulation path 71 as indicated by the solid arrows, and when it flows through the reheating heat exchanger 76, it is heated by the gas combustion reheating burner 78. Be done. The bath return thermistor 75 is for detecting the temperature of the bath water flowing into the bath circulation path 71 from the bath 72, and the bath going thermistor 77 is the temperature of the bath water after being heated by the reheating heat exchanger 76. To detect

  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 includes detection signals from an incoming water thermistor 52a, a can thermistor 56, an outgoing water thermistor 57, a bath return thermistor 75, a going bath thermistor 77, a hot water sensor 52b, a hot water amount sensor 70b, a water flow switch 74, and a water pressure sensor 79. Is input. The controller 50a controls the operation of the water amount servo 52c, the heat source bypass control valve 59, the hot water valve 70a, the bath pump 73, the hot water supply burner 54, the refueling burner 78, the drainage valve 94a, and the drainage valve 96a.

  The controller 40 a of the heat pump unit 40 can communicate with the controller 20 a of the tank unit 20. The controller 20 a of the tank unit 20 can communicate with the controller 50 a of the gas heat source unit 50. The controller 50a of the gas heat source unit 50 can communicate with the remote control 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, etc., and the information set by the remote control 50b is input to the gas heat source unit 50. Be done. The user can use the remote control 50b to set the hot water supply setting temperature, the hot water setting temperature, the hot water setting water level or the like, and start the water removal operation. Further, a timer is incorporated in the remote control 50b, and information of the current time can be held. When the current time is set to the remote control 50b, a timer operation can be performed such that the heating operation is performed in the late-night time zone, or the hot water pouring operation is performed at a desired time.

  In the hot water supply system 10, as described below, a boiling operation, a defrosting operation, a hot water supply operation, a hot water operation, a reheating operation, a water removal operation, and the like can be performed.

(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, when the refrigerant compressed and heated by the compressor 41 flows through the refrigerant passage 43a of the first heat exchanger 43, it heats circulating water flowing through the circulating water passage 43b. The refrigerant flowing out of the refrigerant flow path 43 a is expanded and cooled by the expansion valve 44, and when flowing through the second heat exchanger 45, the refrigerant absorbs heat from the outside air and rises in temperature. The temperature-increased refrigerant flows into the compressor 41 and is further compressed as it is compressed. Further, in the heat pump unit 40, the circulation pump 48b is driven.

  In the tank unit 20, the water in the hot water storage tank 21 is sucked from the bottom of the hot water storage tank 21 to the circulation forward path 33 by driving the circulation pump 48b. The water sucked into the circulation forward path 33 is heated when passing through the circulating water flow path 43 b of the first heat exchanger 43 of the heat pump unit 40 and rises in temperature. The warm water whose temperature has risen flows through the circulation return path 34 and is returned to the top of the hot water storage tank 21. By this circulation being performed, in the hot water storage tank 21, a temperature stratification in which a high temperature layer is stacked on the low temperature layer is formed. When hot water of high temperature continues to be returned to the hot water storage tank 21, the thickness (depth) of the high temperature layer gradually increases, and in the state where the heat is completely stored, high temperature hot water is stored in the entire hot water storage tank 21. . Even if heat storage is not completely performed 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 broken arrows, the defrost valve 47a is temporarily opened so that the high temperature refrigerant discharged from the compressor 41 flows to the second heat exchanger 45 through the defrost path 47. As the high temperature refrigerant 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 water supply flow rate sensor 26b exceeds a predetermined value, it is determined that hot water supply to the hot water supply valve 80 or the bathtub 72 is started, and the hot water supply system 10 performs heat storage hot water 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 which is higher by a predetermined temperature than the hot water supply setting temperature set by the remote control 50b, 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 amount servo 52c is fully closed. Further, the opening degree of the hot water control valve 25a and the opening degree of the water supply control valve 26a are adjusted so that the water temperature detected by the mixing thermistor 27a becomes the hot water supply set temperature. The mixed water adjusted to the hot water supply setting temperature flows through the first mixing path 27, and is then supplied with hot water from the hot water supply tap 80 through the hot water supply bypass path 28 and the first hot water supply path 29.

  On the other hand, when the detected water temperature of the upper thermistor 39 is less 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 28 a is fully closed, and the water amount servo 52 c is set to a predetermined opening degree. Further, the opening degree of the hot water control valve 25a is set to the opening degree of the water supply control valve 26a so that the water temperature detected by the mixing thermistor 27a becomes lower than the hot water supply set temperature by the temperature rising range by the hot water supply heat exchanger 53. adjust. The mixed water adjusted to a temperature lower than the hot water supply set temperature flows through the first mixing path 27, flows through the second mixing path 52 of the gas heat source unit 50, and flows into the hot water supply heat exchanger 53. It is heated by In the hot water supply heat exchanger 53, the water temperature detected by the can thermistor 56 provided at the outlet of the hot water supply heat exchanger 53 is controlled to be 60 ° C. or higher. Thereby, it can suppress that dew condensation water generate | occur | produces in piping. When the hot water supply set temperature is lower than 60 ° C., the opening degree of the heat source machine bypass control valve 59 is controlled such that the water temperature detected by the hot water discharge thermistor 57 becomes the hot water supply set temperature. A portion of the mixed water flowing through the second mixing path 52 flows into the second hot water supply path 55 through the heat source machine bypass path 58 and flows through the hot water supply heat exchanger 53 with the water of 60 ° C. or more and the hot water supply heat exchanger 53 The low temperature water which does not flow is mixed and it becomes the warm water of hot water supply set temperature. In this manner, the hot water whose temperature is adjusted to the hot water supply set temperature is supplied from the hot water supply plug 80 through the second hot water supply path 55 and the first hot water supply path 29. Thus, even when the hot water stored in the hot water storage tank 21 is consumed during the heat storage and hot water supply operation, the hot water whose temperature is controlled to the hot water supply set temperature can be continuously supplied.

(Hot water operation)
When the hot water operation is performed on the bathtub 72, the hot water supply temperature setting is replaced with the hot water temperature setting temperature, and the above-described heating and hot water supply operation is performed. When the hot water request of the bathtub 72 is input to the remote control 50b, the hot water valve 70a is opened to supply hot water to the bathtub 72. The hot water having flowed from the second hot water supply passage 55 through the hot water passage 70 is supplied to the bathtub 72 through the return flow passage 76a and the forward flow passage 76b, as indicated by the broken arrows. Hot water corresponding to the hot water setting temperature set by the remote control 50 b is supplied to the bathtub 72.

(Repulse operation)
If the temperature of the bath water stored in the bath 72 decreases, the bath pump 73 is operated to ignite the reheating burner 78. By this reheating operation, the bathtub water of the bathtub 72 is repelled and returns to the hot water setting temperature.

(Draining operation)
When the hot water supply system 10 is not used for a long time in winter, if water remains in the piping, the piping may be frozen. So, in the hot water supply system 10 of a present Example, the water removal operation which drains water in piping is possible. When the start of the water removal operation is instructed via the remote control 50b, the hot water supply system 10 performs the operation shown in FIG.

  In step S10, the controller 50a operates the bath pump 73. Thereby, the water present in the bath circulation path 71 can be flowed to the bath 72, and the water is drained from the drainage plug (not shown) of the bath 72. After the bath pump 73 is actuated and the first predetermined time has elapsed, the controller 50a stops the bath pump 73. The first predetermined time is, for example, 60 seconds.

  In step S12, the controller 50a confirms whether the state in which the water flow is not detected by the water flow switch 74 continues for a second predetermined time. If the water in the bath circulation path 71 is completely drained by driving the bath pump 73 for 60 seconds in step S10, the water flow switch 74 does not detect the water flow. Therefore, if a state where no water flow is detected by the water flow switch 74 continues for 10 seconds, the controller 50a determines that all the water in the bath circulation path 71 has been drained.

  If, in step S12, the state in which the water flow is not detected by the water flow switch 74 does not continue for 10 seconds, that is, it is considered that water remains in the bath circulation path 71, the process returns to step S10, and the controller 50a again performs bath pump Drive 73. Thereby, the water in the bath circulation path 71 is drained from the drainage plug (not shown) of the bath 72.

  In step S14, the controller 50a fully closes the water amount servo 52c if the water amount servo 52c is open, and opens the water filling valve 70a if the water filling valve 70a is closed. As a result, the water present in the second mixing path 52, the heat exchanger 53, the heat source machine bypass path 58, and the second hot water supply path 55 on the downstream side of the water amount servo 52c flows through the hot water path 70 and the bath circulation It flows into the bathtub 72 through the path 71.

  Next, in step S16, the controller 50a determines whether the amount of water passing through the hot water passage 70 detected by the hot water amount sensor 70b (hereinafter, "hot water flow rate") satisfies a certain condition. This condition is for confirming the presence or absence of the water flow toward the bath circulation path 71 via the filling path 70. As an example of this condition, for example, (1) when the state where the rate exceeds 2 liters per minute continues for 5 seconds, or (2) when the state where the hot water flow rate is not 0 continues for 20 seconds, etc. It can be mentioned.

  If, in step S16, the above conditions (1) and (2) are satisfied, the second mixing path 52 downstream of the water quantity servo 52c, the inside of the heat exchanger 53, the heat source machine bypass path 58, and the second hot water supply path Since it is necessary to drain the water that has flowed into the bath circulation path 71 via the water filling path 70 from 55, the process returns to step S10 again, and the controller 50a drives the bath pump 73 to drain water in the bath circulation path 71. Will do.

  Temporarily, when not satisfy | filling the conditions of said (1) or (2) in step S16, the 2nd mixing path 52 more downstream than water quantity servo 52c, The inside of the heat exchanger 53, the heat source machine bypass path 58, 2nd hot water supply It is considered that no water remains in the path 55, the hot water path 70, and the bath circulation path 71. In this case, the process proceeds to step S18.

  In step S18, the controller 20a, the controller 40a and the controller 50a automatically open the air vent valve 37a, the drain valve 90a, 94a, 96a, 98a, 100a, 102a, 104a, 106a, 108a, and the water of the entire hot water supply system 10 Make a withdrawal. When the air vent valve 37a and the drain valves 90a, 94a, 96a, 98a, 100a, 102a, 104a, 106a and 108a are manually opened and closed valves, the controller 50a releases the air in the remote control 50b in step S18. Guidance may be displayed that prompts the user to open the valve 37a, the drain valve 90a, 94a, 96a, 98a, 100a, 102a, 104a, 106a, 108a.

  In step S20, the controller 50a displays on the remote control 50b that the water removal operation has ended normally. Then, the controller 50a stores, in the non-volatile storage device 50d, that the water removing operation has ended normally. Thereafter, even if the system power is turned off by the user, the information stored in the non-volatile storage device 50d is retained.

(Test run of hot water supply system 10)
When installing the hot water supply system 10 in a house, after installing the heat pump unit 40, the tank unit 20 and the gas heat source unit 50 to an appropriate installation place according to the layout of the house, connect the piping between the units, The power supply line is connected to the gas heat source unit 50 and the gas supply line is connected to the gas heat source unit 50. Then, if it is confirmed that there is no abnormality by performing the preparation operation such as the water filling operation, the heating test operation, the hot water supply test operation, and the bath test operation as described below, the user uses the hot water supply system 10 as usual. can do. Hereinafter, the preparation operation performed by the hot water supply system 10 will be described. The trial operation is started when the trial operation start switch of the remote control 50b is operated.

(Water filling operation)
In the trial operation, first, the water filling operation is performed. In the water filling operation, the water storage tank 21 is filled with water using water supplied from a water supply.

  When the trial operation start switch is operated, the controller 20a opens the hot water control valve 25a and the water supply control valve 26a at a predetermined opening degree. Thus, the mixing water supply path 26 is in communication with the first mixing path 27, and the hot water path 25 is in communication with the first mixing path 27. Further, the controller 20a closes the bypass control valve 28a and the air vent valve 37a. Further, the controller 50a fully opens the water amount servo 52c and fully closes the heat source machine bypass control valve 59. The controller 40a stops the circulation pump 48b. Thus, water does not circulate in the heat pump unit 40.

  Then, the controller 50a opens the hot water valve 70a. 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 supplied to the hot water passage 25, the first mixing passage 27, the second mixing passage 52, the hot water heat exchanger 53, and the second hot water passage 55 , Passes through the hot water passage 70 and is exhausted to the bathtub 72. Water is also supplied to the pipes of the tank unit 20 and the gas heat source unit 50.

  Thereafter, when the detected flow rate of the hot water flow rate sensor 25b or the water supply flow rate sensor 26b is equal to or more than a predetermined amount, that is, water is stored to a certain extent in the hot water storage tank 21, the controller 40a drives the circulation pump 48b. At this time, the controller 20a opens the air vent valve 37a of the tank unit 20. Thus, water is also supplied to the circulation forward passage 33, circulation forward passage connection passage 48, circulating water passage 43b, circulation return passage connection passage 49, and circulation return passage 34, and the air in these pipes is exhausted from the air vent valve 37a. As a result, the piping of the heat pump unit 40 is also filled with water.

  When the controller 20a determines that the water storage tank 21 is filled with water, the controller 20a ends the water filling operation.

(Boiling test run)
In the boiling test run, 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 boiling test run, it is determined whether heat storage to the hot water storage tank 21 by the heat pump unit 40 is normally performed.

(Hot water trial run)
In the hot water supply test run, 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 the hot water supply plug 80 is heated similarly to the thermal storage hot water supply test run in normal operation. In the hot water supply test, it is determined whether the temperature adjustment by the mixer 24 is properly performed.

(Bath trial run)
In the bath trial operation, the same operation as the hot water operation in normal operation and the refueling operation is performed. In the bath trial run, it is determined whether or not the hot water heating at the hot water supply set temperature to the bathtub 72 and the repelling of the bathtub water of the bathtub 72 are properly performed. Moreover, in the bath trial run, the size of the tub 72 is calculated from the amount of water supplied to the tub 72 obtained by integrating the detected flow rate of the hot water amount sensor 70b and the water level of the tub 72 calculated from the detected water pressure of the water pressure sensor 79. Is grasped.

(Operation at power on)
In the hot water supply system 10 of the present embodiment, as described above, the user can instruct the execution of the drain operation by the remote control 50b. Then, when the water removal operation is performed, the controller 50a of the hot water supply system 10 stores the fact that the water removal operation is performed in the non-volatile storage device 50d. Below, the case where the hot-water supply system 10 is used next time is demonstrated using FIG.

When the power supply of the hot water supply system 10 is turned on, in step S22, the controller 40a prohibits heating by the heat pump unit 40 in normal operation .

Next, in step S24, the controller 50a determines whether or not the non-volatile storage device 50d stores that the water removal operation has been performed. If it is stored in the non-volatile storage device 50d that the water removal operation has been performed, the process proceeds to step S26. In step S26, the controller 50a stands by until the user instructs execution of the automatic test run via the remote control 50b. When the user instructs execution of the automatic test operation, the above-described water filling operation, boiling test operation, hot water supply test operation, bath test operation, and the like are performed. After the automatic test run is performed, the process proceeds to step S30. In step S30, the controller 40a permits heating by the heat pump unit 40 in normal operation .

If it is not stored in step S24 that the non-volatile storage device 50d has performed the water removal operation, the process proceeds to step S28. In step S28, the controller 50a stands by until a predetermined time passes. The predetermined time here is, for example, to the circulation forward path 33, circulation forward path connection path 48, circulation water path 43b, circulation return path connection path 49, circulation return path 34 in the water filling operation performed by manual water filling operation after power on. Set the time longer than the time it takes to fill the water. With such a configuration, although the fact that the water draining operation has been performed is not stored in the non-volatile storage device 50d, the heat pump unit 40 may not be fully drained even when water draining is actually performed. It can be prevented. Then, in step S30, the controller 40a permits heating by the heat pump unit 40 in the normal operation .

(Modification)
In the present embodiment, when the hot water supply system 10 performs the drainage operation, the controller 50a automatically stores the fact that the drainage has been performed in the non-volatile storage device 50d. Unlike or in addition to this, when the user manually drains and inputs that draining has been performed via the remote control 50b, the controller 50a drains the non-volatile storage device 50d. It may be configured to store the fact that it has been done.

  As mentioned above, although the specific example of this invention was described in detail, these are only an illustration and do not limit a claim. The art set forth in the claims includes various variations and modifications of the specific examples illustrated above. Further, the technical elements described in the present specification or the drawings exert technical usefulness alone or in various combinations, and are not limited to the combinations described in the claims at the time of filing. In addition, the techniques illustrated in the present specification or the drawings simultaneously achieve a plurality of purposes, and achieving one of the purposes itself has technical utility.

10 hot water supply system; 20 tank unit; 20a controller; 21 hot water storage tank; 22 water supply path; 22a tap water inlet; 23 pressure reducing valve; 24 mixer; 24a mixing valve; 25 hot water path; 25a hot water control valve; 26c water supply control valve; 26b water supply flow sensor; 26c water supply thermistor; 27 first mixing path; 27a mixing thermistor; 28 hot water bypass path; 28a bypass control valve; 29 first hot water path; 29a hot water supply thermistor; 31 drainage path; 32 drainage valve; 33 circulation forward path; 34 circulation return path; 36 forward path thermistor; 37 air vent path; 37a air vent valve; 38 pressure relief path; 38a relief valve; 39 upper thermistor; 40 heat pump unit; Controller; 40c Operation switch: 41 compressor; 42 four-way valve; 43 first heat exchanger; 43a refrigerant flow path; 43b circulating water flow path; 44 expansion valve; 45 second heat exchanger; 45a fan; 46 refrigerant piping; ; 47a defrosting valve; 48 circulating forward path connecting path; 48a inlet side thermistor; 48b circulating pump; 49 circulating return path connecting path; 49a outlet side thermistor; 50 gas heat source unit; 50a controller; 50b remote control; 50d nonvolatile memory device; 52 water mixing thermistor; 52b water quantity sensor; 52c water quantity servo; 53 heat exchanger for hot water supply; 54 burner for hot water supply; 55 second hot water supply path; 56 cans thermistor; Heat source machine bypass path; 59 heat source machine bypass control valve; 70 hot water path; 70a hot water valve; 70 Hot water amount sensor; 71 bath circulation path; 72 bath; 73 bath pump; 74 water flow switch; 75 bath return thermistor; 76 heat exchanger for reheating; 76a return flow path; 76b forward flow path; 90 water drainage valves; 90a drainage valves; 94 drainage channels; 94a drainage valves; 96 drainage channels; 96a drainage valves; 98 drainage channels; 98a drainage valves; 100 100a drainage valve; 102 drainage channel; 102a drainage valve; 104 drainage channel; 104a drainage valve; 106 drainage channel; 106a drainage valve; 108 drainage channel; 108a drainage valve

Claims (2)

A tank for storing water,
A heating device for heating water;
A circulation path for circulating water between the tank and the heating device;
A thermal apparatus comprising a control device having a non-volatile storage device, comprising:
The controller is capable of performing a water filling operation for filling the circulation path and the tank ,
The control device is capable of storing in the non-volatile storage device that water removal from the circulation path has been performed,
The control device is configured to prohibit the heating of the water by the heating device until the completion of the water filling operation, when it is stored that the non-volatile storage device has performed draining when the power is turned on. Thermal equipment. It is possible to execute a drainage operation to drain water from the circulation route,
The heat device according to claim 1, wherein the control device stores, in the non-volatile storage device, that water removal from the circulation path has been performed when the heat device performs the water removal operation.

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