JP7188093B2 - Storage hot water heater - Google Patents

Description

The present invention relates to a storage hot water heater.

In the conventional hot water storage type water heater disclosed in Patent Document 1 below, when the inside of the hot water storage tank is filled with water after installation, the water that overflows when the inside of the hot water storage tank is full flows out of the relief valve. do. After that, the circulation pump is operated to perform an air bleeding operation to remove the air inside the piping.

JP 2018-091513 A

During the construction of the hot water storage type water heater, there is a possibility that foreign matter may enter the pipe connecting between the hot water storage tank and the heat source machine. In the hot water storage type hot water heater of Patent Document 1, when the water is drained from the relief valve after the hot water storage tank is full, or when the air bleeding operation is performed, the foreign matter flows into the seal portion of the relief valve, and the relief valve is closed. There is a problem that foreign matter is caught or sealing failure occurs.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a hot water storage type hot water heater capable of reliably suppressing foreign matter from flowing into a relief valve.

A hot water storage type water heater according to the present invention connects a heat source device for heating water, a tank unit having a hot water storage tank capable of storing hot water heated by the heat source device, and an inlet of the heat source device and the tank unit. In a hot water storage type water heater provided with a water inlet pipe and a hot water outlet pipe connecting between an outlet of the heat source machine and the tank unit, the tank unit includes a circulation pump for circulating water in the pipe connected to the hot water storage tank, and a hot water storage tank. A tank upper pipe communicating with a hot water introduction outlet at the top of the tank, a first bypass pipe communicating with a hot water introduction port at an intermediate height or a lower part of the hot water storage tank, a second bypass pipe communicating with an outlet of a circulation pump, A heat exchanger for exchanging heat between the heat source water flowing through the primary channel and the water to be heated flowing through the secondary channel; a water outlet pipe communicating with the water outlet at the bottom of the hot water storage tank; is connected to the tank top pipe, and the other end is connected to the inlet of the primary side flow path of the heat exchanger, the heat source water outlet pipe is connected to the outlet of the primary side flow path of the heat exchanger, and the circulation A flow having an inlet pipe communicating with the inlet of the pump, a water supply pipe communicating with the water inlet at the bottom of the hot water storage tank, a relief valve provided in the tank upper pipe, and a first multi-way valve and a second multi-way valve The first multi-way valve is connected to the water outlet pipe, the heat source water outlet pipe, and the inlet pipe, and the second multi-way valve is connected to the hot water outlet pipe and the tank upper pipe. , the first bypass pipe and the second bypass pipe, the water inlet pipe is connected to the outlet of the circulation pump, and the flow path switching means is connected to the water outlet pipe and the inlet by the first multi-way valve The piping and the heat source water outlet piping are communicated in three directions, the tank upper piping and the second bypass piping are communicated with the second multi-way valve, and the hot water supply piping and the first bypass piping are cut off, thereby opening the hot water storage tank . The first flow path through which the water from the water outlet flows into the hot water storage tank from the hot water inlet without passing through the water inlet pipe and the hot water outlet pipe, and the first multi-way valve cut off the water outlet pipe to isolate the inlet pipe and the heat source. The water discharged from the hot water inlet of the hot water storage tank is communicated with the water outlet pipe, the hot water outlet pipe is communicated with the first bypass pipe by the second multi-way valve, and the tank upper pipe and the second bypass pipe are cut off. can form a second flow path that flows from the hot water inlet into the hot water storage tank through the water inlet pipe and the hot water outlet pipe, and after the construction of the hot water storage type hot water heater, the water flows from the water inlet into the hot water storage tank through the water supply pipe. The channel switching means forms the first channel when performing the water injection operation satisfying the above.

ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to provide the hot-water storage-type hot-water heater which can suppress reliably that a foreign material flows into an escape valve.

1 is a configuration diagram showing a hot water storage type hot water heater according to Embodiment 1. FIG. 2 is a configuration diagram of a first flow path in the hot water storage type hot water heater according to Embodiment 1. FIG. FIG. 4 is a configuration diagram of a second flow path, which is a circulation flow path, during a foreign matter removal operation in the storage-type hot water heater according to Embodiment 1; FIG. 5 is a diagram showing a flowchart executed by the control device during foreign matter removal operation;

Embodiments will be described below with reference to the drawings. Elements that are common or correspond to each figure are denoted by the same reference numerals, and overlapping descriptions are simplified or omitted.

Embodiment 1.
FIG. 1 is a configuration diagram showing a hot water storage type hot water heater according to Embodiment 1. As shown in FIG. As shown in FIG. 1 , the storage hot water heater 35 includes a tank unit 33 , an HP (heat pump) unit 7 and a remote controller 44 . The HP unit 7 and the tank unit 33 are connected via a water inlet pipe 14, a hot water outlet pipe 15, and electrical wiring (not shown). A control device 36 is incorporated in the tank unit 33 . The operations of various valves, pumps, etc. provided in the tank unit 33 and the HP unit 7 are controlled by a control device 36 electrically connected thereto.

The remote control device 44 has a function of receiving a user's operation relating to a driving operation command, a change of set values, and the like. Remote control device 44 is an example of a user interface. The control device 36 and the remote control device 44 are connected by wire or wirelessly so as to enable bidirectional data communication. Although not shown, the remote control device 44 includes a display unit for displaying information such as the state of the storage-type water heater 35, an operation unit such as switches operated by the user, a speaker, a microphone, and the like. The display section of the remote control device 44 has a function as notification means for notifying the user of information. The remote control device 44 in the present embodiment has a display unit as notification means, but as a modification, it may be provided with other notification means such as a voice guidance device.

In this embodiment, the remote control device 44 may be installed on the wall of the kitchen, living room, bathroom, or the like. A plurality of remote control devices 44 may be able to communicate with the control device 36 . Also, for example, a mobile terminal such as a smartphone may be configured to have a function as a user interface like the remote control device 44 . The mobile terminal and the control device 36 may communicate via a network.

The HP unit 7 corresponds to a heat source machine that heats water. The HP unit 7 includes a refrigerant circuit in which a compressor 1 , a water-refrigerant heat exchanger 3 , an expansion valve 4 , and an air heat exchanger 6 are annularly connected by refrigerant pipes 5 . The HP unit 7 operates a heat pump cycle using this refrigerant circuit. In the water-refrigerant heat exchanger 3, heat is exchanged between the refrigerant compressed by the compressor 1 and the water guided from the tank unit 33, thereby heating the water.

The tank unit 33 incorporates the following various parts, piping, and the like. The hot water storage tank 8 stores hot water. Inside the hot water storage tank 8, temperature stratification can be formed in which the upper side has a higher temperature and the lower side has a lower temperature due to the difference in water density due to temperature.

The tank unit 33 incorporates the following various parts, piping, and the like. The hot water storage tank 8 is for storing hot water. Due to the difference in water density due to temperature, a temperature stratification is formed in the hot water storage tank 8 with a high temperature on the upper side and a low temperature on the lower side. A water inlet 8a provided at the bottom of the hot water storage tank 8 is connected to a third water supply pipe 9c. Water supplied from a water source such as tap water is regulated to a predetermined pressure by the pressure reducing valve 31 and flows into the hot water storage tank 8 through the third water supply pipe 9c. A pipe connected to a hot water introduction outlet 8 d provided in the upper part of the hot water storage tank 8 is divided at a branch portion 41 into a tank upper pipe 13 and a hot water supply pipe 21 . The hot water supply pipe 21 is a pipe for supplying the hot water stored in the hot water tank 8 to the outside of the hot water storage type hot water heater 35 . During the boiling operation, hot water heated by the HP unit 7 flows into the hot water storage tank 8 from the hot water introduction outlet 8d through the tank upper pipe 13, thereby flowing from top to bottom in the hot water storage tank 8. Hot water gradually accumulates. A plurality of stored hot water temperature sensors 42 and 43 are attached to the surface of the hot water storage tank 8 at different heights. By detecting the temperature distribution of the hot water in the hot water storage tank 8 with these hot water storage temperature sensors 42 and 43, the control device 36 can detect the remaining hot water amount and the heat storage amount in the hot water storage tank 8. FIG. The control device 36 controls the start and stop of the boiling operation according to the detected remaining hot water amount or heat storage amount in the hot water storage tank 8 . In the illustrated example, two stored hot water temperature sensors 42 and 43 are provided, but more stored hot water temperature sensors may be provided. In this embodiment, the number of ports formed in the hot water storage tank 8 can be reduced by connecting both the tank upper pipe 13 and the hot water supply pipe 21 to one hot water introduction outlet 8d.

A three-way valve 11 , a circulation pump 12 , a four-way valve 18 and a bath heat exchanger 20 are provided in the tank unit 33 . The circulation pump 12 is a pump for circulating hot water in various pipes. The water inlet pipe 14 connects between the outlet of the circulation pump 12 and the inlet of the HP unit 7 . An inlet pipe 19 is connected to the inlet of the circulation pump 12 .

The bath heat exchanger 20 is a heat exchanger for heating the water to be heated by exchanging heat between the heat source water flowing through the primary channel and the water to be heated flowing through the secondary channel. . In the present embodiment, an example is described in which the bath heat exchanger 20 that heats the bath water circulating from the bath 30 is provided. A heat exchanger for the water to be heated may be provided. Hot water from the hot water storage tank 8 or the HP unit 7 can be supplied to the bath heat exchanger 20 as heat source water.

The bath-going pipe 27 connects between the outlet of the secondary-side channel of the bath heat exchanger 20 and the bathtub 30 . The bath return pipe 28 connects between the bathtub 30 and the inlet of the secondary flow path of the bath heat exchanger 20 . A bath circulation pump 29 for circulating bath water and a bath return temperature sensor 38 for detecting the temperature of the bath water discharged from the bath tub 30 are installed in the bath return pipe 28. - 特許庁A bath-going temperature sensor 37 for detecting the temperature of the bathtub water coming out of the bath heat exchanger 20 is installed in the middle of the bath-going pipe 27 .

The three-way valve 11 is flow path switching means having an a port and a b port through which hot water flows in and a c port through which hot water flows out. The three-way valve 11 corresponds to a first multi-way valve. The four-way valve 18 is flow path switching means having b port and c port into which hot water flows and a port and d port into which hot water flows out. It is configured such that the flow path can be switched between the four paths of . The four-way valve 18 corresponds to a second multi-way valve. The tank unit 33 also has a water outlet pipe 10 , a heat source water inlet pipe 20 a , a first bypass pipe 16 , a heat source water outlet pipe 20 b and a second bypass pipe 17 . The water outlet pipe 10 connects between the water outlet 8 b provided at the bottom of the hot water storage tank 8 and the a port of the three-way valve 11 . The inlet pipe 19 connects between the c port of the three-way valve 11 and the inlet of the circulation pump 12 . The hot water outlet pipe 15 connects between the outlet of the HP unit 7 and the c port of the four-way valve 18 . The tank upper pipe 13 connects between the d port of the four-way valve 18 and the branch portion 41 . The first bypass pipe 16 connects between the a port of the four-way valve 18 and the hot water inlet 8 c provided at the intermediate height portion or the lower portion of the hot water storage tank 8 . The heat source water inlet pipe 20 a connects between the branch portion 40 provided in the middle of the tank upper pipe 13 and the inlet of the primary side flow path of the bath heat exchanger 20 . The heat source water outlet pipe 20 b connects between the outlet of the primary side passage of the bath heat exchanger 20 and the b port of the three-way valve 11 . The second bypass pipe 17 connects between the branch portion 32 provided in the middle of the water inlet pipe 14 and the b port of the four-way valve 18 . The branch 32 is located inside the tank unit 33 . The second bypass pipe 17 communicates with the outlet of the circulation pump 12 via the branch portion 32 and part of the water inlet pipe 14 . In this embodiment, the heat source water inlet pipe 20a communicates from the branch portion 40 through the tank upper pipe 13 to the hot water introduction outlet 8d. Therefore, since it is not necessary to directly connect the heat source water inlet pipe 20a to the upper portion of the hot water storage tank 8, the number of ports formed in the upper portion of the hot water storage tank 8 can be reduced.

Further, the tank unit 33 has a first water supply pipe 9 a , a second water supply pipe 9 b , a hot water mixing valve 22 , a bath mixing valve 23 , a first hot water supply pipe 24 and a second hot water supply pipe 25 . One end of the first water supply pipe 9a is connected to a water source such as tap water. The second water supply pipe 9b is branched from the middle and connected to the hot water supply mixing valve 22 and the bath mixing valve 23, respectively. The hot water supply pipe 21 is branched from the middle and connected to a hot water supply mixing valve 22 and a bath mixing valve 23, respectively. In the middle of the second hot water supply pipe 25, a bath solenoid valve 26 for opening and closing the second hot water supply pipe 25 and a bath flow sensor 45 for detecting the flow rate of hot water passing through the second hot water supply pipe 25 are provided.

The hot water supply mixing valve 22 and the bath mixing valve 23 are operated by the user by adjusting the flow rate ratio between the hot water supplied from the hot water supply pipe 21 and the low temperature water supplied from the second water supply pipe 9b. Hot water having a set temperature set at 44 is generated and flowed into the first hot water supply pipe 24 and the second hot water supply pipe 25, respectively. The hot water whose temperature is adjusted by the hot water supply mixing valve 22 is supplied from the first hot water supply pipe 24 to a faucet (not shown) such as a shower and a faucet used by the user via a hot water supply tap 34 . On the other hand, the hot water adjusted to the set temperature by the bath mixing valve 23 is supplied from the second hot water supply pipe 25 to the bathtub 30 via the bath flow sensor 45, the bath solenoid valve 26, the bath going pipe 27, and the bath returning pipe 28. be done.

The three-way valve 11 has a form in which the water outlet pipe 10 and the inlet pipe 19 communicate, a form in which the heat source water outlet pipe 20b and the inlet pipe 19 communicate, and a form in which the water outlet pipe 10, the inlet pipe 19 and the heat source water outlet are connected. It is possible to switch between three flow path forms, one being a form in which three directions are communicated with the pipe 20b. The four-way valve 18 has a form in which the hot water outlet pipe 15 and the tank upper pipe 13 communicate, a form in which the hot water outlet pipe 15 and the first bypass pipe 16 communicate, and a form in which the first bypass pipe 16 and the second bypass pipe 17 communicate. It is possible to switch between four flow path forms, that is, a form in which the tank upper pipe 13 and the second bypass pipe 17 communicate with each other.

A relief valve 39 is connected to the pipe between the hot water introduction outlet 8 d at the top of the hot water storage tank 8 and the branch portion 41 . The relief valve 39 opens when the pressure in the hot water tank 8 exceeds a threshold value. During the boiling operation, the pressure in the hot water storage tank 8 rises due to the generation of expanded water due to volumetric expansion of water and gasification of dissolved air. In the boiling-up operation, when the pressure in the hot water storage tank 8 exceeds the threshold value, the relief valve 39 opens and the expanded water and gas are discharged from the relief valve 39 to the outside of the system. This prevents the pressure in the hot water storage tank 8 from rising excessively.

After the hot water storage type water heater 35 is constructed, a water injection operation is performed to fill the hot water storage tank 8 with water. At the time of pouring water, the relief valve 39 is manually opened. In the present embodiment, the first flow path, which is a flow path through which water does not flow into the water inlet pipe 14 and the hot water outlet pipe 15, can be formed by the three-way valve 11 and the four-way valve 18, which are the flow channel switching means. is.

FIG. 2 is a configuration diagram of the first flow path in the hot water storage type water heater 35 according to Embodiment 1. As shown in FIG. Arrows in FIG. 2 indicate the flow of water during the water injection operation. At the time of water injection operation, it is as follows. The three-way valve 11 has a configuration in which three directions of the water outlet pipe 10, the inlet pipe 19, and the heat source water outlet pipe 20b are communicated with each other. The four-way valve 18 is configured such that the tank upper pipe 13 communicates with the second bypass pipe 17 and the hot water discharge pipe 15 and the first bypass pipe 16 are blocked. After passing through the first water supply pipe 9a, the water supplied from the water source passes through the pressure reducing valve 31 and the third water supply pipe 9c, and flows into the hot water storage tank 8 from the water inlet 8a. When water starts to accumulate in the hot water storage tank 8, the water in the hot water storage tank 8 flows into the three-way valve 11 through the water outlet pipe 10 from the water outlet 8b. The water that has flowed into the three-way valve 11 is divided into a channel that passes through the inlet pipe 19 and flows into the circulation pump 12, and a channel that passes through the heat source water outlet pipe 20b and flows into the bath heat exchanger 20. flow. After that, as the water level in the hot water tank 8 rises, the water that has passed through the circulation pump 12 passes through the branch 32, the second bypass pipe 17, the four-way valve 18, and the tank top pipe 13, and reaches the upper part of the hot water tank 8. reaches the hot water introduction outlet 8d. On the other hand, the water flowing to the heat source water outlet pipe 20b passes through the bath heat exchanger 20 and the heat source water inlet pipe 20a and joins the tank upper pipe 13 at the branch 40 . The channel as described above corresponds to the first channel. When the inside of the hot water storage tank 8 is filled with water, the overflowing water is discharged from the relief valve 39 to the outside. After the inside of the hot water storage tank 8 is filled with water, the water injection operation is finished by manually closing the escape valve 39. - 特許庁

When the hot water storage type hot water heater 35 is constructed, the water inlet pipe 14 and the hot water outlet pipe 15 are connected to the HP unit 7 and the tank unit 33 outdoors. have a nature. Here, assuming that water flows inside the water inlet pipe 14 and hot water outlet pipe 15 in the water pouring operation, the following is the case. Foreign matter inside the water inlet pipe 14 and the hot water outlet pipe 15 may be washed away by the water, pass through the four-way valve 18 and the upper tank pipe 13 , and reach the sealing portion of the relief valve 39 . As a result, when the relief valve 39 is closed, or when the relief valve 39 is opened and closed during the air bleeding operation or the test boiling operation, the operation of the relief valve 39, such as foreign matter caught in the relief valve 39 or a sealing failure, may occur. Defects may occur.

In contrast to this, according to the present embodiment, the water injection operation can be performed through the first flow path in which water does not flow into the water inlet pipe 14 and the hot water outlet pipe 15 . Therefore, it is possible to reliably prevent foreign matter inside the water inlet pipe 14 and the hot water outlet pipe 15 from flowing to the relief valve 39 . Therefore, it is possible to reliably prevent the escape valve 39 from malfunctioning due to the inflow of foreign matter.

The water injection operation is performed after installation of the hot water storage type hot water heater 35 and before the hot water storage type hot water heater 35 is energized. After construction, the three-way valve 11 and the four-way valve 18 are in the form described with reference to FIG. In the present embodiment, since it is not necessary to operate the circulation pump 12 during the water injection operation, the water injection operation can be performed while the hot water storage type hot water heater 35 is not energized. After the water pouring operation is completed and energization of the storage-type water heater 35 is started, the control device 36 can execute the foreign matter removal operation. The foreign matter removal operation is an operation for removing foreign matter inside the water inlet pipe 14 and the hot water outlet pipe 15 by operating the circulation pump 12 so that water flows inside the water inlet pipe 14 and the hot water outlet pipe 15 .

The first flow path in the present embodiment is a flow path passing through circulation pump 12 . Therefore, the inside of the circulation pump 12 is filled with water when the water injection operation is completed. Therefore, it is possible to reliably prevent the occurrence of poor water circulation due to idle operation in a state where there is no water inside the circulation pump 12 when the foreign object removal operation is performed. In addition, in the first flow path in the present embodiment, water flows out from the water outlet 8b at the bottom of the hot water storage tank 8, and the water passes through the piping forming the first flow path, and the hot water is introduced at the top of the hot water storage tank 8. It becomes a flow path that flows into the hot water storage tank 8 from the outlet 8d. This provides the following effects. To surely send water to the inside of a pipe forming a first flow path by the head pressure of water accumulated in a hot water storage tank 8 even in a state before the hot water storage tank 8 becomes full at the time of water injection operation. can be done. Therefore, the inside of the pipe forming the first flow path can be reliably filled with water without operating the circulation pump 12 .

After the water filling operation, the inside of the hot water storage tank 8 may be drained without energizing the hot water storage type hot water heater 35 . For example, there is a case where the inside of the hot water storage tank 8 is drained after performing a water injection operation, and after checking for water leaks at the connecting portion of the piping connected to the hot water storage type hot water heater 35 . In the present embodiment, in such a case, the flow path is such that water does not remain in the piping inside the hot water storage type hot water heater 35 . As a result, water can be drained without remaining water in the pipes, so that even when the outside air temperature drops below freezing, the pipes or parts can be reliably prevented from being damaged by freezing. When the inside of the hot water storage tank 8 is to be drained, a drain valve (not shown) communicating with the lower portion of the hot water storage tank 8 is opened. When the drain valve is opened, the water in the hot water storage tank 8 and the water in the pipes in the tank unit 33 are drained outside from the drain valve by gravity. Even after the water injection operation, water remains inside the water inlet pipe 14 and the hot water outlet pipe 15 because no water enters the water inlet pipe 14 and the hot water outlet pipe 15 before the hot water storage type hot water heater 35 is energized. never.

FIG. 3 is a configuration diagram of a second flow path, which is a circulation flow path, during foreign matter removal operation in storage-type water heater 35 according to Embodiment 1. As shown in FIG. Arrows in FIG. 3 indicate the flow of water during the foreign matter removal operation. FIG. 4 is a diagram showing a flowchart executed by the control device 36 during the foreign matter removal operation. As described above, before the hot water storage type hot water heater 35 is energized, the water inlet pipe 14 and the hot water outlet pipe 15 are configured so as to prevent water from flowing even when the hot water storage tank 8 is full. After starting power supply to the hot water storage type hot water heater 35 , the control device 36 performs a foreign matter removing operation for flushing away foreign matter remaining inside the water inlet pipe 14 and the hot water outlet pipe 15 .

When the control device 36 starts the process of the foreign matter removing operation, first, in step S1 of FIG. 4, the three-way valve 11 and the four-way valve 18 are switched to change from the first flow path to the second flow path. That is, the control device 36 sets the three-way valve 11 so that the heat source water outlet pipe 20b and the inlet pipe 19 are communicated to block the water outlet pipe 10, and the four-way valve 18 is set to the hot water outlet pipe 15 and the first bypass. The tank top pipe 13 and the second bypass pipe 17 are blocked by communicating with the pipe 16 . Next, the control device 36 drives the circulation pump 12 as step S2. Thereby, water circulates through the second channel shown in FIG. That is, the water in the upper part of the hot water storage tank 8 flows out from the hot water introduction outlet 8d, and the water is transferred to the tank upper pipe 13, the branch part 40, the heat source water inlet pipe 20a, the bath heat exchanger 20, and the heat source water outlet pipe 20b. , three-way valve 11, inlet pipe 19, circulation pump 12, water inlet pipe 14, HP unit 7, hot water outlet pipe 15, four-way valve 18, and first bypass pipe 16, and from hot water inlet 8c into hot water storage tank 8 flow into

When water circulates through the second flow path as described above during the foreign matter removal operation, the foreign matter remaining inside the water inlet pipe 14 and the hot water outlet pipe 15 is washed away by the water and stored hot water from the hot water inlet 8c. It flows into the tank 8 and sinks to the bottom inside the hot water storage tank 8 . In this manner, foreign matter inside the water inlet pipe 14 and the hot water outlet pipe 15 can be removed. As a result, the foreign matter does not reach the sealing portion of the relief valve 39 during the subsequent boiling-up operation or the like, and it is possible to reliably prevent the occurrence of clogging of the relief valve 39 by foreign matter or defective sealing. In addition, in the second flow path in the present embodiment, water flows out from the hot water introduction outlet 8d at the top of the hot water storage tank 8, and the water flows out of the hot water storage tank 8 from the middle height portion of the hot water storage tank 8 or from the hot water introduction port 8c at the bottom. It becomes the flow path which flows into 8. As a result, the water that pushes away the foreign matter inside the water inlet pipe 14 and the hot water outlet pipe 15 during the foreign matter removal operation does not flow to the upper part of the hot water storage tank 8, so that the foreign matter does not reach the sealing portion of the escape valve 39. can be prevented more reliably.

The foreign matter removal operation in the present embodiment also serves as an air removal operation for sending the air inside the water inlet pipe 14 and the hot water outlet pipe 15 to the upper part of the hot water storage tank 8 . That is, in the foreign matter removal operation, the air inside the water inlet pipe 14 and hot water outlet pipe 15 passes through the four-way valve 18 and the first bypass pipe 16 and flows into the hot water tank 8 from the hot water inlet 8c. Float to the top. The air accumulated in the upper part of the hot water storage tank 8 can be discharged to the outside by opening the hot water tap 34, for example. Further, since the second flow path in the present embodiment passes through the primary side flow path of the bath heat exchanger 20, the air in the primary side flow path of the bath heat exchanger 20 is reliably removed by the foreign matter removal operation. can do.

The length of the water inlet pipe 14 and the hot water outlet pipe 15 varies depending on the location where the hot water storage type hot water heater 35 is installed. In the foreign matter removal operation, the driving time of the circulation pump 12 required to remove the air and foreign matter inside the water inlet pipe 14 and the hot water outlet pipe 15 and send them to the hot water storage tank 8 increases as the water inlet pipe 14 and the hot water outlet pipe 15 are longer. ,become longer. The lengths of the water inlet pipe 14 and the hot water outlet pipe 15 are subject to predetermined construction restrictions. The control device 36 controls foreign substances such that the removal of air and foreign substances inside the water inlet pipe 14 and the hot water outlet pipe 15 is completed even when the length of the water inlet pipe 14 and the hot water outlet pipe 15 is the maximum length within the construction restrictions. It controls the driving time of the circulation pump 12 in the removal operation. For example, when the length of each of the water inlet pipe 14 and the hot water outlet pipe 15 is set to a maximum of 15 m, when the length of each of the water inlet pipe 14 and the hot water outlet pipe 15 is 15 m The control device 36 sets the driving time of the circulation pump 12 in the foreign matter removal operation to, for example, 10 minutes so that the removal of air and foreign matter inside the water inlet pipe 14 and the hot water outlet pipe 15 is completed immediately.

After the driving of the circulation pump 12 is started in step S2, the control device 36 stops the circulation pump 12 when the predetermined driving time as described above has elapsed (step S3). Thereafter, the control device 36 changes the opening degrees of the three-way valve 11 and the four-way valve 18 to predetermined standby opening degrees (step S4). As a result, the processing of the foreign matter removal operation is completed.

After a certain period of time (for example, 1 minute) has passed since the storage-type water heater 35 was energized, the control device 36 switches the three-way valve 11 and The four-way valve 18 may be switched automatically. After that, the control device 36 may drive the circulation pump 12 to automatically perform the foreign matter removal operation. By doing so, it is possible to reliably perform the foreign matter removal operation after the hot water storage type hot water heater 35 is installed.

1 compressor 3 water refrigerant heat exchanger 4 expansion valve 5 refrigerant piping 6 air heat exchanger 7 HP unit 8 hot water storage tank 8a water inlet 8b water outlet 8c hot water inlet 8d hot water Introduction outlet 9a First water supply pipe 9b Second water supply pipe 9c Third water supply pipe 10 Water outlet pipe 11 Three-way valve 12 Circulation pump 13 Tank upper pipe 14 Water inlet pipe 15 Hot water outlet pipe 16 Third 1 bypass pipe 17 second bypass pipe 18 four-way valve 19 inlet pipe 20 heat exchanger for bath 20a heat source water inlet pipe 20b heat source water outlet pipe 21 hot water supply pipe 22 hot water mixing valve 23 for bath Mixing valve 24 First hot water supply pipe 25 Second hot water supply pipe 26 Solenoid valve for bath 27 Bath going pipe 28 Bath return pipe 29 Bath circulation pump 30 Bathtub 31 Pressure reducing valve 32 Branch part 33 Tank unit 34 Hot water tap 35 Hot water storage type hot water heater 36 Control device 37 Bath going temperature sensor 38 Bath returning temperature sensor 39 Relief valve 40 Branching part 41 Branching part 42, 43 Hot water storage temperature sensor 44 Remote control device 45 bath flow sensor

Claims (5)

a heat source machine for heating water;
a tank unit having a hot water storage tank capable of storing hot water heated by the heat source machine;
a water inlet pipe connecting between the inlet of the heat source machine and the tank unit;
a hot water supply pipe connecting between the outlet of the heat source machine and the tank unit;
In a hot water storage type water heater comprising
The tank unit is
a circulation pump for circulating water through a pipe connected to the hot water storage tank;
a tank upper pipe communicating with a hot water introduction outlet at the upper part of the hot water storage tank;
a first bypass pipe that communicates with a hot water inlet at an intermediate height portion or a lower portion of the hot water storage tank;
a second bypass pipe communicating with the outlet of the circulation pump;
a heat exchanger that exchanges heat between the heat source water flowing through the primary channel and the water to be heated flowing through the secondary channel;
a water outlet pipe communicating with a water outlet at the bottom of the hot water storage tank;
a heat source water outlet pipe that communicates with an outlet of the primary flow path of the heat exchanger;
a heat source water inlet pipe, one end of which communicates with the tank top pipe and the other end of which communicates with the inlet of the primary flow path of the heat exchanger;
a heat source water outlet pipe that communicates with an outlet of the primary flow path of the heat exchanger;
an inlet pipe communicating with the inlet of the circulation pump;
a water supply pipe communicating with a water inlet at the bottom of the hot water storage tank;
A relief valve provided in the tank upper pipe;
A channel switching means having a first multi-way valve and a second multi-way valve ,
The first multi-way valve is connected to the water outlet pipe, the heat source water outlet pipe, and the inlet pipe,
The second multi-way valve is connected to the hot water supply pipe, the tank upper pipe, the first bypass pipe, and the second bypass pipe,
The water inlet pipe is connected to an outlet of the circulation pump,
The flow path switching means is
The first multi-way valve communicates the water outlet pipe, the inlet pipe, and the heat source water outlet pipe in three directions, and the second multi-way valve connects the tank upper pipe and the second bypass pipe. By connecting the hot water supply pipe and the first bypass pipe, the water discharged from the water outlet of the hot water storage tank does not pass through the water inlet pipe and the hot water outlet pipe, and the hot water is stored from the hot water inlet outlet . a first flow path that flows into the tank;
The first multi-way valve shuts off the water outlet pipe, communicates the inlet pipe with the heat source water outlet pipe, and communicates with the hot water outlet pipe and the first bypass pipe with the second multi-way valve. and the tank top pipe and the second bypass pipe are cut off, so that the water coming out of the hot water inlet of the hot water storage tank passes through the water inlet pipe and the hot water outlet pipe and flows from the hot water inlet to the hot water storage tank. can form a second flow path that flows into the
The hot water storage type hot water supply device in which the flow path switching means forms the first flow path when a water pouring operation is performed to fill the hot water storage tank with water from the water inlet through the water supply pipe after construction of the hot water storage type hot water heater. machine. A control means capable of executing a foreign matter removal operation after performing the water injection operation,
In the foreign object removal operation, the control means causes water to flow through the water inlet pipe and the hot water outlet pipe by driving the circulation pump in a state where the flow path switching means forms the second flow path. The hot water storage type water heater according to claim 1 . 3. The hot water storage type hot water heater according to claim 2 , wherein the control means switches the flow path switching means so that the second flow path is formed when a predetermined time has elapsed since the hot water storage type hot water heater was energized. . 4. The hot water storage type water heater according to claim 2 or 3 , wherein said foreign object removal operation also serves as an air removal operation for sending air inside said water inlet pipe and said hot water outlet pipe to an upper portion of said hot water storage tank. The control means is configured to complete the removal of the air inside the water inlet pipe and the hot water outlet pipe even when the length of the water inlet pipe and the hot water outlet pipe is the maximum length within construction restrictions. The hot water storage type hot water heater according to any one of claims 2 to 4 , wherein the drive time of the circulation pump is controlled during the foreign matter removing operation.

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