JP6863724B2 - Hot water supply system - Google Patents

Description

The present invention relates to a hot water supply system including a water heater and a heat radiating device using the water heater as a heat source device.

A first combustion chamber provided with a first heat exchanger and a first burner for hot water supply, and a second heat exchanger and a second burner for heating fluid circulating in a circulation path such as a heating circuit were provided. In a water heater provided with a second combustion chamber, generally, one combustion fan simultaneously sends combustion air to both the first combustion chamber and the second combustion chamber. Alternatively, even when combustion fans are provided in each of the first combustion chamber and the second combustion chamber, the combustion gas exhaust path from the first combustion chamber and the combustion gas exhaust path from the second combustion chamber merge into one. When the exhaust is discharged from the exhaust port, even if only one of the first burner and the second burner is burned, control is performed to operate each combustion fan at the same time in order to prevent the exhaust from sneaking into the other. (See Patent Document 1).

Japanese Unexamined Patent Publication No. 2005-337531

From the viewpoint of ensuring comfort when using the shower, the fluctuation of the hot water supply temperature when the hot water supply operation is restarted before a certain period of time (for example, 5 minutes) has elapsed after the hot water supply operation is stopped is, for example, ± 3. A function (called a Q function) that keeps the temperature within ° C is desired.

However, if combustion for reheating or heating the bath is performed in the second combustion chamber after the hot water supply operation is stopped, the combustion fan operates for this combustion, so that the first combustion chamber on the hot water supply side also burns. Air from the fan is sent in, and the heat exchanger on the hot water supply side is cooled. Therefore, the hot water discharge temperature at the time of re-supplying hot water after the hot water supply is stopped is remarkably lowered, and comfort and energy saving are impaired.

An object of the present invention is to solve the above problems, and an object of the present invention is to provide a hot water supply system in which the hot water supply temperature does not drop significantly when the hot water supply is restarted within a certain period of time after the hot water supply is stopped.

The gist of the present invention for achieving such an object lies in the inventions of the following items.

[1] A hot water supply system including a water heater and a heat radiating device using the water heater as a heat source.
The water heater
The first combustion chamber and
A first heat exchanger housed in the first combustion chamber and through which a hot water supply pipe passes.
A first burner for heating the first heat exchanger and
The second combustion chamber and
A second heat exchanger housed in the second combustion chamber and through which a pipe of a predetermined circulation path through which the radiator of the heat radiating device is inserted passes.
A circulation pump provided in the circulation path and
A second burner for heating the second heat exchanger and
A combustion fan in which at least one of the first burner and the second burner operates during combustion to blow combustion air to both the first combustion chamber and the second combustion chamber.
When there is water flowing through the hot water supply pipe, the first burner is burned to supply hot water at a set temperature for hot water supply, and the circulation pump is operated in response to an operation request from the heat radiating device. A control unit that controls a circulating fluid heating operation in which the fluid circulating in the circulation path is heated by the second burner.
A communication unit that communicates with the heat dissipation device,
With
The control unit transmits hot water supply operation information indicating the operating state of the hot water supply operation to the heat radiating device using the communication unit.
The heat radiating device determines whether or not it is a predetermined period after the water heater stops the hot water supply operation based on the hot water supply operation information received from the water heater, and prohibits the operation request during the predetermined period. A hot water supply system characterized in that the amount of heat required by the operation request is limited to a predetermined amount or less.

In the above invention, transmission of an operation request from the heat radiating device to the water heater is prohibited for a predetermined period after the hot water supply operation is stopped. As a result, if the hot water supply operation is not restarted after the hot water supply operation is stopped, the combustion fan is maintained in the stopped state (or the state of a small air volume), and the hot water supply side heat exchanger (first heat exchange) by blowing air from the combustion fan. The cooling of the vessel) is suppressed, and a significant decrease in the hot water discharge temperature when the hot water supply is restarted is prevented.

[2] Described in [1], the predetermined period is a period after the stop of the hot water supply operation, before the restart of the hot water supply operation, and before the predetermined time elapses from the stop of the hot water supply operation. Hot water supply system.

[3] When the operation instruction of the own device continues from before the end of the predetermined period to after the end of the predetermined period, the heat radiating device makes the operation request including the compensation instruction after the end of the predetermined period. ,
[1] or [2], wherein the water heater performs the circulating fluid heating operation by increasing the operating speed of the circulation pump more than usual when receiving an operation request including the replenishment instruction. Hot water supply system.

In the above invention, when the transmission of the operation request is prohibited in a predetermined period after the hot water supply operation is stopped even though the heat radiating device is operated, in order to compensate for the shortage of the heating amount caused by the prohibition or the like. Increase the operating speed of the circulation pump in the circulation fluid heating operation after the prohibition is lifted.

[4] The heat dissipation device, based on the hot water supply operation information, the hot water supply operation water heater is stopped, it is determined whether or not to use the shower, when was the hot water supply operation to use the shower Only, the transmission of the operation request is prohibited during a predetermined period after the hot water supply operation is stopped, or the amount of heat required by the operation request is limited to a predetermined amount or less [1] to [3]. ] The hot water supply system described in any one of.

In the above invention, control is performed to prohibit the transmission of the operation request or limit the required amount of heat only when it is presumed that the hot water supply is used immediately before the hot water supply is stopped by the shower.

[5] The hot water supply system according to any one of [1] to [4], wherein the control unit prohibits a post fan based on the suspension of the hot water supply operation for the predetermined period.

[6] The control unit does not perform a post-fan based on the stop of the hot water supply operation when the circulating fluid heating operation is scheduled within a predetermined period after the stop of the hot water supply operation [6]. The hot water supply system according to any one of 1] to [5].

In the above invention, when the circulation fluid heating operation is scheduled to be executed within a predetermined period after the hot water supply operation is stopped, the hot water supply post fan is substituted by the operation of the combustion fan accompanying the circulation fluid heating operation.

According to the hot water supply system according to the present invention, when the hot water supply is restarted within a certain period of time after the hot water supply is stopped, the initial hot water supply temperature does not drop significantly, and comfort and energy saving are improved.

It is a figure which shows the schematic structure of the hot water supply system which concerns on embodiment of this invention. It is a flow chart which shows the control of the operation of a combustion fan. It is a flow chart which shows the process of transmitting the operation state information which shows the operation state of the hot water supply operation performed by a water heater. It is a flow chart which shows the process which the water heater controls the operation of a circulatory system in response to the operation request from a heat radiating device. It is a flow chart which shows the process of canceling the prohibition / restriction of an operation request performed by a heat radiating device. It is a flow chart which shows the process which a heat radiating device sends an operation request to a water heater. It is a flow chart which shows the control of a post fan at the end of use of hot water supply.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows a schematic configuration of a hot water supply system 1 according to an embodiment of the present invention. The hot water supply system 1 includes a water heater 10, a heat radiating device 70 using the water heater 10 as a heat source, and a second heat radiating device 80. The water heater 10 has a hot water supply function that heats the water supply and supplies (exhausts) hot water to a shower in the bathroom, a faucet in the kitchen, etc., a hot water pouring function that drops hot water into the bathtub 2, and reheats the hot water in the bathtub 2. It is equipped with a reheating function that raises the temperature. In addition, hot water at the set temperature is automatically filled in the bathtub 2 so that the water level reaches the set water level, and after the hot water filling is completed, the set water level and the set temperature are maintained for a predetermined time (for example, 4 hours). It is equipped with an automatic operation function for baths that reheat.

Further, the water heater 10 has a heat source function of circulating a heated heat medium fluid (here, hot water) in the heat radiating device 70 and the second heat radiating device 80. For example, the heat radiating device 70 is a high-temperature heating terminal, which is a bathroom heater that sends warm air to warm the bathroom. The second heat radiating device 80 is a low-temperature heating terminal, for example, a hot water mat for floor heating installed under the floor material.

The water heater 10 includes a combustion fan 11 and a vertically long tubular combustion chamber 13 having an exhaust port 12 at the upper part to which air blown by the combustion fan 11 is sent from below. The inside of the combustion chamber 13 is divided into a first combustion chamber 13a and a second combustion chamber 13b by vertically partitioning the combustion chamber 13. The combustion fan 11 is also used in the first combustion chamber 13a and the second combustion chamber 13b, and simultaneously blows air to both the first combustion chamber 13a and the second combustion chamber 13b to supply combustion air.

A first burner 14a is provided below the first combustion chamber 13a, and a first heat exchanger 15 through which a hot water supply pipe passes is arranged above the first burner 14a. The first heat exchanger 15 is composed of a latent heat exchanger 15a and a sensible heat exchanger 15b. A second burner 14b is provided below the second combustion chamber 13b, and a second heat exchanger 16 through which pipes forming a predetermined circulation path pass is arranged above the second burner 14b. The second heat exchanger 16 is composed of a second latent heat exchanger 16a and a second sensible heat exchanger 16b. The combustion fan may be provided separately in the first combustion chamber 13a and the second combustion chamber 13b. In this case, when at least one of the first burner 14a and the second burner 14b is burning, the combustion fan may be provided individually. Both combustion fans are controlled to operate.

Here, the above circulation path includes a basic path, a high-temperature heating path branching from the basic path and passing through the radiator 71 of the heat sink 70, and a radiator 81 of the second heat sink 80 branching from the basic path. It is composed of a low-temperature heating path passing through and a reheating circuit for reheating the hot water of the bathtub 2.

The basic route is from the outlet side of the second sensible heat exchanger 16b, via the conduit 21, the flow control valve 22, the primary side piping of the water-water heat exchanger 23, the conduit 24, and the conduit 25. 2 It is composed of a path that reaches the latent heat exchanger 16a, passes through the systurn 17 and the circulation pump 18 from the exit side of the second latent heat exchanger 16a, and then returns to the entrance side of the second sensible heat exchanger 16b through the pipeline 26. Will be done. Further, the basic path is a connecting pipe connecting the pipeline 21 connected to the outlet side of the second sensible heat exchanger 16b and the conduit 26 between the outlet side of the first sensible heat exchanger 15b and the systurn 17. Has 38. A flow rate adjusting valve 39 is provided in the middle of the connecting pipe 38, and a bypass pipe 38b that bypasses the flow rate adjusting valve 39 is provided.

The systurn 17 is an air-open container in which a predetermined amount of water circulating in the basic route is stored. The systurn 17 is provided with a water level sensor that detects the water level in the systurn 17, and when the water level falls below a predetermined value, water is supplied through a water injection pipe 61 described later.

The high-temperature heating path is either a high-temperature outgoing pipe 31 that branches from the pipeline 21 and reaches the entrance side of the radiator 71 via a thermal valve 72 of the heat sink 70, or a confluence portion 28 from the outlet side of the radiator 71. It is composed of a high temperature return pipe 32 leading to one entry side connection port. The pipeline 29 connected to the exit side of the confluence 28 is connected to the confluence of the conduit 25 and the conduit 24 and merges.

The low-temperature heating path is a low-temperature going pipe 34 that branches from the pipeline 26 downstream of the circulation pump 18 and reaches the entrance side of the radiator 81 of the second heat sink 80 via the thermal valve 33, and the radiator 81. It is composed of a high temperature return pipe 35 extending from the exit side of the merging portion 28 to any one of the entrance side connection ports of the merging portion 28.

The reheating circuit includes a water pipe on the secondary side of the water-water heat exchanger 23, a bath going pipe 36 from the outlet side of the water pipe on the secondary side to the circulation port (exit side) of the bathtub 2, and water-water. It is composed of a bath return pipe 37 from the inlet side of the water pipe on the secondary side of the heat exchanger 23 to the circulation port (entrance side) of the bath 2 via the bath circulation pump 19.

A conduit 21 connected to the outlet side of the second sensible heat exchanger 16b is provided with a heat exchange temperature sensor 41 that detects the temperature of hot water discharged from the second sensible heat exchanger 16b. A return temperature sensor 42 for detecting the temperature of hot water returning to the second latent heat exchanger 16a is provided in the conduit 25 connected to the inlet side of the second latent heat exchanger 16a. Further, the bath return pipe 37 is provided with a bath return temperature sensor 40. A low temperature forward temperature sensor 49 for detecting the temperature of hot water sent to the low temperature heating path is provided in the pipeline 26 immediately downstream of the circulation pump 18.

The water supply pipe 51 that receives the supply of water from the water supply source is connected to the inlet side of the first latent heat exchanger 15a, and the outlet side of the first latent heat exchanger 15a is on the inlet side of the first sensible heat exchanger 15b. A hot water supply pipe 52 leading to a hot water tap is connected to the outlet side of the first sensible heat exchanger 15b. A water amount sensor 53 for detecting the amount of water supplied through the water supply pipe 51 is provided in the middle of the water supply pipe 51, and a water amount servo 54 for adjusting (restricting) the amount of water supplied from the water supply source is located downstream of the water amount sensor 53. It is provided.

The bypass pipe 55 branched from the water supply pipe 51 at a predetermined location downstream of the water amount servo 54 joins and is connected to the predetermined location of the hot water supply pipe 52. A bypass mixing valve 56 is provided in the middle of the bypass pipe 55 for adjusting the amount of water supplied from the water supply pipe 51 to the hot water supply pipe 52 side through the bypass pipe 55.

The water supply pipe 51 on the upstream side of the water amount sensor 53 is provided with a water supply temperature sensor 43 that detects the temperature of the water supply. The hot water supply pipe 52 near the outlet side of the first sensible heat exchanger 15b is provided with a hot water supply heat exchange temperature sensor 44 for detecting the temperature of the hot water in the first sensible heat exchanger 15b.

Further, the bath return pipe 37 near the location where the bath return temperature sensor 40 is provided and the hot water supply pipe 52 at a predetermined location downstream from the confluence of the bypass pipe 55 are connected by a connecting pipe 57, and the connecting pipe 57 is connected. A hot water pouring electromagnetic valve 58 that switches the connecting pipe 57 between an open state and a shut off state, and a check valve 59 for preventing backflow from the bath return pipe 37 side to the hot water supply pipe 52 are inserted in the middle of the pipe. ing.

Further, a water injection pipe 61 branched in the middle of the water supply pipe 51 leads to the systurn 17, and an electromagnetic valve 62 for switching the water injection pipe 61 between an open state and a shutoff state is inserted in the middle of the water injection pipe 61. There is. When the solenoid valve 62 is opened, the systurn 17 is replenished with water.

The supply path of combustion gas is as follows. A source gas solenoid valve 65 for switching whether or not to shut off the combustion gas from the supply source is provided in the middle of the gas supply pipe 64 connected to the combustion gas supply source, and the combustion gas to be supplied is provided downstream thereof. A gas proportional valve 66 for arbitrarily adjusting the amount of gas is provided. The gas supply pipe 64 branches into two downstream of the gas proportional valve 66, one is connected to the first burner 14a via the gas solenoid valve 67, and the other is connected to the second burner via the gas solenoid valve 68. It is connected to 14b.

In addition, the water heater 10 has an outside air temperature sensor 45 that detects the outside air temperature. Further, the water heater 10 includes a control unit 40 that controls the operation of the water heater 10. The control unit 40 is composed of circuits whose main parts are a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), and the like, and the CPU executes various processes according to a program stored in the ROM. As a result, the operation as the water heater 10 is realized.

The control unit 40 includes a communication unit 46. The communication unit 46 includes a remote controller (abbreviated as a remote controller) having a function of receiving various settings and operation instructions from the user, a function of displaying the setting contents and the operation status, and a heat dissipation device 70 and a second heat dissipation device. It functions to communicate with the device 80. Here, as the remote controller, there are a bath remote controller 47 installed in the bath and a main remote controller 48 installed in the kitchen or the like.

The heat radiating device 70 includes a heat radiating device 71, a blower fan 73 that blows hot air received by the heat radiating device 71 toward the heat radiating device 71 so as to come out from an outlet, and a control unit 74 that controls the operation of the heat radiating device 70. I have. The control unit 74 includes a communication unit 75 for communicating with the water heater 10. Further, the control unit 75 is connected to an operation panel 76 that receives operations such as turning on / off the heating operation and setting the heating temperature from the user. The heat radiating device 70 includes a room temperature sensor 77 that detects the ambient temperature.

The second heat radiating device 80 has a remote controller, but the description thereof will be omitted. The remote controller of the second heat radiating device 80 is also connected to the communication unit 46 of the control unit 40.

Next, the outline of the hot water pouring operation, the reheating operation, and the heating operation in the hot water supply system 1 will be described.

<Hot water supply operation>
When the hot water tap is opened and the water amount sensor 53 detects the water flow in the water supply pipe 51, the control unit 40 operates the combustion fan 11, ignites the first burner 14a, and burns the combustion gas with the first burner 14a. Let me. The water supplied from the water supply source is heated by receiving the heat of the exhaust from the first burner 14a when passing through the first heat exchanger 15 (the first latent heat exchanger 15a and the first exposed heat exchanger 15b). When the bypass mixing valve 56 is open, it is further mixed with the water supply from the bypass pipe 55, and then the hot water is discharged to the hot water tap. The control unit 40 controls the combustion amount of the first heat exchanger 15, the opening degree of the bypass mixing valve 56, and the like so that the hot water outlet temperature becomes the hot water supply set temperature. When the water amount sensor 53 no longer detects the passage of water, the supply of the combustion gas to the first heat exchanger 15 is cut off, the combustion of the first heat exchanger 15 is stopped, and the combustion fan 11 is stopped.

<Pouring operation>
The hot water pouring operation is executed when an instruction for automatic bath operation or hot water pouring is received from the bath remote controller 47 or the main remote controller 48. In the hot water pouring operation, the control unit 40 opens the hot water pouring solenoid valve 58, operates the combustion fan 11, and ignites the first burner 14a to burn the combustion gas. As a result, the hot water generated in the same manner as the hot water supply operation flows into the bath return pipe 37 through the connecting pipe 57, and is dropped into the bathtub 2 through the bath return pipe 37 and the bath going pipe 36. When the hot water in the bathtub 2 reaches the set water level, the pouring operation is stopped. Specifically, the pouring solenoid valve 58 is closed, the supply of combustion gas to the first burner 14a is cut off, and the combustion fan 11 is stopped.

<Reheating operation>
The reheating operation is when the temperature of the bathtub water in the bathtub 2 is raised to the set temperature of the bath after the above-mentioned pouring operation is performed based on the instruction of the automatic operation of the bath and the water is filled with the set water level. Alternatively, it is executed when the temperature of the hot water in the bathtub 2 is raised to maintain the bath set temperature during the automatic operation of the bath, or when a reheating instruction is received from the user. The reheating operation for maintaining the hot water in the bathtub 2 at the bath set temperature during the automatic operation of the bath is performed periodically, for example, every 30 minutes.

In the reheating operation, the control unit 40 opens the flow control valve 22, operates the circulation pump 18 and the bath circulation pump 19, operates the combustion fan 11, ignites the second burner 14b, and ignites the second burner 14b. Burn the combustion gas with. By the action of the circulation pump 18, hot water in the circulation path circulates via the second heat exchanger 16 and the water-water heat exchanger 23. That is, the hot water leaving the second sensible heat exchanger 16b of the second heat exchanger 16 passes through the flow control valve 22 and the primary side of the water-water heat exchanger 23 from the branch point in the middle of the pipeline 21. After that, it circulates through the conduit 24, the conduit 25, the second latent heat exchanger 16a, the systurn 17, the circulation pump 18, and the conduit 26 to reach the second sensible heat exchanger 16b. Although the flow rate adjusting valve 39 is closed, a part of the hot water passing through the pipeline 21 on the exit side of the second sensible heat exchanger 16b is routed upstream of the systurn 17 through the connecting pipe 38 and the bypass pipe 38b. It flows into 26.

In parallel with the above operation, due to the action of the bath circulation pump 19, the bathtub water in the bathtub 2 passes from the bath return pipe 37 through the water pipe on the secondary side of the water-water heat exchanger 23, and passes through the bath outbound pipe 36. It circulates back to bathtub 2. The circulating water circulating in the circulation path is heated by the second heat exchanger 16, and when passing through the primary side of the water-water heat exchanger 23, the heat circulates on the primary side of the water-water heat exchanger 23. Move to water to heat the bath water.

<Heating operation>
The heating operation (circulating fluid heating operation) is performed based on the operation request from the heat radiating device 70. When the heat dissipation device 7 0 receives an instruction to turn on the heating operation from the user at the operation panel 7 6 compares the room temperature set heating temperature and room temperature sensor 7 7 that is set on the operation panel 7 6 detects , The operation request of the heating operation is transmitted to the water heater 10 so that the room temperature becomes the heating set temperature. The operation request includes information indicating the amount of heat required. Controller 4 0 water heater 10 receives the operation request heating operation from the heat radiator 7 0, actuates the circulation pump 1 8 actuates the combustion fan 11, second to ignite the second burner 14b The combustion gas is burned by the burner 14b. Hot water circulates in the heating circuit by the action of the circulation pump 18. The circulating hot water receives the heat of the exhaust gas from the second burner 14b when passing through the second heat exchanger 16, is heated, and dissipates heat when passing through the radiator 71 of the heat radiating device 70, and is dissipated from the blower fan 73. Warm the air.

<Heating operation>
The heating operation includes a high-temperature heating operation in which hot water of about 80 ° C. is sent out to the high-temperature heating path and circulated, and a low-temperature heating operation in which hot water of about 60 ° C. is sent out to the low-temperature heating path and circulated.

In the high-temperature heating operation, for example, when the heating operation is turned on on the operation panel 76 of the heat-dissipating device 70, which is a high-temperature heating terminal, the heat-dissipating device 70 energizes the thermal valve 72 and instructs the heating operation to be turned on (high-temperature heating). The request) is transmitted to the control unit 40 of the water heater 10. More specifically, the heating set temperature set on the operation panel 76 and the room temperature detected by the room temperature sensor 77 are compared, and an operation request for heating operation is sent to the water heater 10 so that the room temperature becomes the heating set temperature. Send. The operation request includes information indicating the amount of heat required.

Upon receiving the operation request for high-temperature heating, the water heater 10 turns on the circulation pump 18 to burn the second burner 14b and operates the combustion fan 11.

The thermal valve 72 does not open immediately when energized, for example, it opens about 1 minute after the start of energization. Therefore, at the beginning (it is assumed that the flow control valve 22 and the thermal valve 33 of the low temperature heating path are closed), the circulating water sent out by the circulation pump 18 is the second heat exchanger 16 After being heated by the heat exchanger 16b, it circulates through the connecting pipe 38 and the bypass pipe 38b, and further through the systurn 17 to the circulation pump 18 without going from the pipeline 21 to the high temperature outgoing pipe 31. .. Therefore, the detection temperature of the heat exchange temperature sensor 41 reaches about 80 ° C. in the first 10 seconds, and the second burner 14b is turned off. After that, until the thermal valve 72 is opened (for example, about 50 seconds), the combustion of the second burner 14b is turned off.

When the thermal valve 72 is opened, the circulating water sent out by the circulation pump 18 is the heat of the second exposed heat exchanger 16b of the second heat exchanger 16, the conduit 21, the high temperature going pipe 31, and the heat radiating device 70. It circulates through the valve 72, the radiator 71, the high temperature return pipe 32, the confluence 28, the pipeline 29, the conduit 25, the second latent heat exchanger 16a, and the systurn 17 to the circulation pump 18. A part of the hot water passing through the conduit 21 on the outlet side of the second sensible heat exchanger 16b flows into the conduit 26 upstream of the systurn 17 through the connecting pipe 38 and the bypass pipe 38b.

When circulation is started by such a route, the cold circulating water in the high-temperature outgoing pipe 31 and the high-temperature return pipe 32 outside the water heater 10 enters the water heater 10, so that the water heater 10 dissipates heat. Combustion of the second burner 14b is started in order to maintain the temperature of the hot water sent out to the device 70 (the temperature detected by the heat exchange temperature sensor 41) at 80 ° C. After that, it burns continuously for about 5 minutes, but when the bathroom warms up, after that, the combustion is turned on / off to maintain the detection temperature of the heat exchange temperature sensor 41 at 80 ° C. When the flow control valve 22 is open, the circulating water that comes out of the second sensible heat exchanger 16b and flows through the pipeline 21 branches, and a part of it branches on the primary side of the water-water heat exchanger 23. It flows through the pipeline 24 and the conduit 25.

In the low-temperature heating operation, for example, when a remote controller (for example, a remote controller for floor heating) of the second heat radiating device 80, which is a low-temperature heating terminal, receives an operation to turn on the heating operation, the remote controller gives an instruction to turn on the low-temperature heating operation (for example). The operation request for low-temperature heating) is transmitted to the control unit 40 of the water heater 10. Upon receiving this instruction, the water heater 10 starts energizing the thermal valve 33, turns on the circulation pump 18, burns the second burner 14b, and operates the combustion fan 11.

In this case as well, since the thermal valve 33 does not open at the beginning of energization, when the high temperature heating terminal is not operating, the circulating water sent out by the circulation pump 18 immediately reaches the target temperature, and the water heater 10 receives the water heater 10. After that, the combustion of the second burner 14b is turned off until the thermal valve 33 is opened.

When the thermal valve 33 is opened, the circulating water sent out by the circulation pump 18 branches downstream of the circulation pump 18, one of which is the thermal valve 33, the low temperature outgoing pipe 34, and the radiator of the second heat dissipation device 80. It flows through the 81, the low temperature return pipe 35, the merging portion 28, the pipeline 29, the second exposed heat exchanger 16b of the second heat exchanger 16, and the systurn 17 to the circulation pump 18. The other branched portion is heated by the second sensible heat exchanger 16b, then flows through the connecting pipe 38 (bypass pipe 38b and the flow rate adjusting valve 39), passes through the systurn 17, and reaches the circulation pump 18.

In the low-temperature heating operation, rapid heating called hot dash operation is performed for the first 30 minutes. Specifically, during the hot dash operation, the flow rate adjusting valve 39 is opened so that more hot water heated by the second sensible heat exchanger 16b is mixed with the hot water directed to the high temperature outbound pipe 31. At the same time, the combustion amount of the second burner 14b is controlled so that the detection temperature of the heat exchange temperature sensor 41 becomes 80 ° C. (or 90 ° C.). On the other hand, in the normal low-temperature heating operation after the end of the hot dash operation, the flow rate adjusting valve 39 is closed (or the opening is reduced), and the detection temperature of the low-temperature forward temperature sensor 49 downstream of the circulation pump 18 becomes 60 ° C. The combustion amount of the second burner 14b is controlled so as to be.

The water heater 10 can simultaneously execute a hot water supply operation, a heating operation, and a reheating operation. However, in the hot water supply system 1 according to the present invention, hot water is discharged when the hot water supply operation is resumed for a predetermined period after the hot water supply operation is completed. In order to reduce the decrease in temperature, control (hot water supply side hot water temperature holding control) such as preventing heating operation and reheating operation (combustion of the second burner 14b) is performed.

That is, if the second burner 14b is burned by the heating operation or the reheating operation after the hot water supply operation is stopped, the combustion fan 11 continues to operate even after the hot water supply operation is stopped. Therefore, the first heat exchanger 15 on the hot water supply side Is cooled by the air blown from the combustion fan 11, and the hot water discharge temperature when the hot water supply is restarted is significantly lowered. On the other hand, even if the heating operation and the reheating operation are stopped for a short time, the temperature of the air in the room to be heated does not change so much. Therefore, the hot water temperature holding control on the hot water supply side is performed such that the heating operation and the reheating operation are not performed for a predetermined period after the hot water supply operation is completed.

Hereinafter, the hot water temperature holding control on the hot water supply side when the heating operation based on the operation request is suppressed from the heat radiating device 70 will be described. In addition, it is assumed that there is no requirement for reheating operation or low temperature heating operation.

The water heater 10 transmits hot water supply operation information indicating the operation status of the hot water supply operation to the heat radiating device 70, and the heat radiating device 70 that receives this transmits the hot water supply operation information of the water heater 10 based on the hot water supply operation information received from the water heater 10. It is determined whether or not the state is during a predetermined period after the hot water supply operation is stopped. Then, during a predetermined period after the hot water supply operation is stopped, control such as prohibiting the transmission of the operation request for the heating operation or limiting the amount of heat required by the operation request to a predetermined amount or less (hot water supply side hot water temperature holding control) is performed. .. Here, the above control is performed so that the Q function of keeping the temperature change at the time of restarting the hot water supply within ± 3 ° C (atmosphere temperature at room temperature and water supply temperature at 16 ° C) is satisfied for 5 minutes after the hot water supply operation is stopped. I do.

In addition, the effect of improving comfort by the Q function is noticeable when the hot water supply is used in the shower. That is, when the shower is stopped once during use and reused, the user feels the fluctuation of the hot water temperature with the whole body, and therefore, if the temperature fluctuation is large, the discomfort given to the user is great. On the other hand, when hot water is discharged to a faucet in a kitchen or the like, there is little discomfort due to a temperature drop because it is only touched by fingers. Therefore, the hot water temperature holding control on the hot water supply side is executed only when the hot water supply is used immediately before the shower. As a result, the cases where the heating operation is prohibited or restricted by the hot water temperature holding control on the hot water supply side are limited, so that the influence of the heat radiating device 70 on the heating effect can be suppressed to a small extent.

FIG. 2 is a flow chart showing control of the operation of the combustion fan 11 performed by the water heater 10. As described above, the combustion fan 11 operates in any of the heating operation, the reheating operation, and the hot water supply operation. Specifically, when the control unit 40 burns one or both of the first burner 14a and the second burner 14b (step S101; Yes), the control unit 40 operates the combustion fan 11 at an operating speed according to the combustion amount (step S101; Yes). Step S102). That is, the smaller the amount of combustion, the slower the operating speed of the combustion fan 11, and the larger the amount of combustion, the faster the operating speed of the combustion fan 11. After that, when the combustion of both the first burner 14a and the second burner 14b is stopped (step S103; Yes), the combustion fan 11 is stopped. In addition to the above, the combustion fan 11 operates for so-called post-purge and pre-purge, and the operation of the combustion fan 11 by these will be described later.

FIG. 3 is a flow chart showing a process performed by the control unit 40 of the water heater 10 regarding transmission of hot water supply operation information. When the hot water supply operation is started (step S121; Yes), hot water supply operation information indicating that the hot water supply operation is in progress is created and transmitted to the heat radiating device 70 (step S122). Thereafter, when the hot water supply operation is stopped (step S123; Yes), the immediately preceding hot water supply operation is determined whether a tapping to use the shower. For example, if the amount of hot water used immediately before is 7 L / min to 13 L / min, or if it is 7 L / min or more, which is considered to be the minimum amount of shower used, it is determined that the amount of hot water used immediately before was a shower. Alternatively, if the amount of hot water used immediately before corresponds to the amount used in the shower and the bath remote controller 47 has a priority to change the set temperature of hot water supply, it is determined that the shower is used.

When it is determined that the immediately preceding hot water supply operation is due to the use of the shower (step S124; Yes), the hot water supply operation is stopped and the hot water supply operation information indicating that the stopped hot water supply operation is the shower use is created to dissipate heat. It is transmitted to the device 70 (step S125). On the other hand, when it is determined that the immediately preceding hot water supply operation is not a shower (step S124; No), the hot water supply operation is stopped and hot water supply operation information indicating that the stopped hot water supply operation is not using the shower is created in the heat radiating device 70. Transmit (step S126).

FIG. 4 is a flow chart showing an operation performed by the water heater 10 with respect to the heating operation. It is monitored whether or not there is an operation request for the heating operation from the heat radiating device 70 (step S141). When the operation request for the heating operation is received from the heat radiating device 70 (step S141; Yes), it is determined whether or not the operation request includes the compensation instruction (step S142). If the compensation instruction is not included (step S142; No), the operating speed of the circulation pump 18 is set to the normal mode, the heating operation is executed with the combustion amount corresponding to the requested heat amount (step S143), and the step S145 is performed. Transition.

When the operation request includes a compensation instruction (step S142; Yes), the operation speed of the circulation pump 18 is set to a higher speed mode than usual, and the heating operation is executed with the combustion amount according to the requested heat amount (step S143). ), The process proceeds to step S145.

In step S145, the reception of the operation request from the heat radiating device 70 is monitored, and if the operation request continues (step S145; No), the process returns to step S142 to continue the process. When the operation request for the heating operation is completed (step S145; Yes), the heating operation is stopped (step S146). As shown in FIG. 2, if the hot water supply operation is not in progress, the combustion of both the first burner 14a and the second burner 14b is stopped by stopping the heating operation, so that the combustion fan 11 is stopped.

Next, the hot water temperature holding control on the hot water supply side performed by the heat radiating device 70 will be described.

FIG. 5 shows the flow of hot water temperature holding control on the hot water supply side performed by the control unit 74 of the heat radiating device 70. Based on the hot water supply operation information received from the water heater 10, when it is determined that the hot water supply operation is completed (step S202; Yes) while the water heater 10 is in the hot water supply operation (step S201), the hot water supply operation stopped immediately before is a shower. It is determined whether or not it has been used (step S203). If the shower is not used (step S203; No), the process returns to step S201.

In the case of using a shower (step S203; Yes), it is set to a state (prohibited / restricted state) in which transmission of an operation request for heating operation is prohibited or the required amount of heat is restricted (prohibited / restricted state). Then, a timer for measuring a predetermined time is started (step S205). This timer measures the time until the above-mentioned prohibited / restricted state is released. In the water heater 10, since the first burner 14a is not burned after the hot water supply operation is completed, if the transmission of the operation request for the heating operation is prohibited, the combustion of the second burner 14b is stopped, and as a result, the first burner 14a and the first burner 14a Both of the two burners 14b are in a non-combustion state, and the combustion fan 11 is stopped.

The heat radiating device 70 does not send an operation request for the heating operation to the water heater 10 unless the user has instructed the heating operation, but the heat radiating device 70 receives the instruction for the heating operation. However, if the prohibited / restricted state is set, the operation request for the heating operation is not transmitted or the amount of heat required for the operation request for the heating operation is limited according to this setting.

The time set in the timer is a predetermined time such as 3 minutes or 5 minutes. This time is set to the target time (5 minutes) of the above-mentioned Q function or a time shorter than that.

When the timer is typed up (step S206; Yes), the above-mentioned prohibited / restricted state is released (step S208), and the process returns to step S201. If the use of hot water supply is resumed before the timer expires (step S206; No) (step S207; Yes), the prohibited / restricted state is released (step S208), and the process returns to step S101.

FIG. 6 is a flow chart showing a process performed by the heat radiating device 70 regarding transmission of an operation request. Waiting for the user to receive an instruction to turn on the heating operation (operation instruction) (step S301; No), and when receiving the operation instruction (step S301; Yes), the prohibited / restricted state is set by the process shown in FIG. It is checked whether or not it is done (step S302).

If the prohibited / restricted state is not set (step S302; No), an operation request is normally transmitted (step S303), and it is determined whether the operation instruction is completed (step S313). When the operation instruction is completed (step S313; Yes), the transmission of the operation request for the heating operation is stopped (step S314), and this process is terminated.

If the operation instruction continues (step S313; No), the process returns to step S302, and it is checked whether or not the state has changed to the prohibited / restricted state while requesting the operation of the heating operation.

When the prohibited / restricted state is set (step S302; Yes), the content of the prohibited / restricted is determined (step S304). If the transmission of the operation request is prohibited (step S304: operation prohibited), the transmission of the operation request is stopped (step S305), and the process proceeds to step S307. As a result, the combustion of the second burner 14b is stopped, and the combustion fan 11 is stopped by the control shown in FIG. When the heating operation is stopped, the operation of the circulation pump 18 is also stopped.

When the setting for limiting the required heat amount is made (step S304: limit), an operation request for limiting the required heat amount to a predetermined value or less is transmitted (step 306), and the process proceeds to step S307. In this case, the water heater 10 suppresses the combustion amount of the second burner 14b according to the limited amount of heat indicated by the request, and executes the heating operation. By suppressing the combustion amount of the second burner 14b to a small value, the combustion fan 11 also operates with a small air volume according to the combustion amount.

In step S307, it is determined whether or not the prohibited / restricted state has been released, and the operation instruction (instruction to turn on the operation of the heat radiating device 70) is completed before the prohibited / restricted state is released (step S307; No). In that case (step S308; Yes), the transmission of the operation request is stopped (step S314), and this process is terminated. Before the operation instruction is completed (step S308; No), if the prohibited / restricted state is released (step S307; Yes), an operation request including the compensation instruction is transmitted to the water heater 10 (step S309). When an operation request including a compensation instruction is received, the water heater 10 rotates the circulation pump 18 at a rotation speed higher than the rotation speed corresponding to the combustion amount while burning the second burner 14b with a combustion amount corresponding to the required heat amount. Operate by number to perform heating operation. As a result, it is possible to compensate for the decrease in the heating effect at an early stage during the period in which the heating operation is prohibited or the amount of heat is desired to be limited.

If a predetermined time elapses after the transmission of the operation request including the compensation instruction is started (step S310; No) and the operation instruction is completed (step S311; Yes), the transmission of the operation request for the heating operation is stopped. Then (step S314), this process ends.

When a predetermined time has elapsed from the start of transmission of the operation request including the compensation instruction (step S310; Yes), the normal operation request not including the compensation instruction is transmitted (step S312). After that, it is determined whether or not the operation instruction is completed, and if it is terminated (step S313; Yes), the transmission of the operation request for the heating operation is stopped (step S314), and this process is terminated.

If the operation instruction continues (step S313; No), the process returns to step S302 to continue the process.

In this way, the operation of the combustion fan 11 is stopped or slowed down by prohibiting the transmission of the operation request for the heating operation or limiting the amount of heat required from the end of the hot water supply operation to the elapse of a predetermined time. It is prevented / suppressed that the temperature of the first heat exchanger 15 is lowered by the air blown from the combustion fan 11 and the Q function is impaired.

For example, if the outside air temperature is 7 ° C., hot water supply is used during heating operation (for example, a shower is used), and hot water supply is resumed 4 minutes after the hot water supply is stopped, the above hot water supply side hot water temperature retention control must be performed. For example, where the hot water temperature drops from 40 ° C to 30 ° C, if the hot water temperature retention control on the hot water supply side (when the timer setting time is 3 minutes) is performed, the hot water temperature drops only from 40 ° C to 37 ° C, which is remarkable. The effect can be obtained.

The second heat radiating device 80 may also be controlled to maintain the hot water temperature on the hot water supply side in the same manner as the heat radiating device 70. The hot water supply side hot water temperature holding control for the reheating operation (or the reheating operation and the low temperature heating operation by the second heat radiating device 80) limits the amount of combustion such that the water heater 10 prohibits the combustion of the second burner 14b. You can do it.

Next, the control of the post fan will be described.
If the post fan (driving the combustion fan 11 for discharging the combustion exhaust gas without combustion) is omitted or the post fan time is shortened after the hot water supply operation is stopped, the warm combustion exhaust gas stays in the appliance (combustion chamber 13). (Or more to stay). That is, while preventing the heat exchanger from being cooled by the air blown by the hot water supply post fan (post fan that accompanies the stop of the hot water supply operation), the warm combustion exhaust gas also stays in the appliance, so that the next hot water supply operation can be performed after a short time. The efficiency of hot water supply will be higher if it is damaged.

However, the temperature of the exhaust gas drops while the warm combustion exhaust gas is retained in the appliance. At this time, moisture in the exhaust gas may condense. Normally, if the moisture in the exhaust gas condenses inside the equipment and adheres to the ignition system, for example, the high voltage of the igniter may cause a ground fault, which may cause ignition failure. Fully run the fan to exhaust the exhaust gas that causes condensation. However, in the water heater 10 according to the present embodiment, after stopping the combustion of the first burner 14a due to the use of hot water supply, the combustion fan 11 is immediately stopped (the hot water supply post fan is set to 0 seconds), or the hot water supply post fan Control to shorten the operating time. Therefore, dew condensation is likely to occur.

Therefore, when the water heater 10 stops the hot water supply operation (combustion stop of the first burner 14a) when the hot water supply is used alone, the combustion fan 11 is stopped immediately when the combustion is stopped, and the combustion fan 11 is stopped for 5 minutes (the Q function is secured). The time for this) is controlled so that the post fan due to the stop of the hot water supply operation is prohibited and the hot water supply post fan is performed 5 minutes after the combustion stop. As a result, the combustion exhaust gas that tends to condense can be discharged to the outside of the appliance before dew condensation, or the moisture that has condensed can be dried to eliminate the cause of ignition failure such as a ground fault. When the post fan is operated 5 minutes after the hot water supply operation is stopped, the hot water in the hot water supply heat exchanger (first heat exchanger 15) replaces the heat insulating material, and the state in which the combustion exhaust gas is less likely to condense is maintained for a longer period of time. can do.

On the other hand, the reheating operation, the heating operation, and the hot water supply operation may be performed at the same time. In such a case, when the hot water supply operation is stopped first, the water heater 10 prohibits the reheating operation and the heating operation or limits the amount of combustion in the subsequent predetermined time, and the post fan based on the stop of the hot water supply operation. Is postponed after 5 minutes, so that the hot water supply heat exchanger (first heat exchanger 15) is prevented from being cooled by the air blown from the combustion fan 11.

By the way, during the automatic operation of the bath, the hot water in the bathtub 2 may be heated in order to maintain the bath set temperature (heat retention operation). That is, in order to maintain the hot water temperature of the bathtub 2 at the bath set temperature, a reheating operation for raising the temperature to the set temperature is performed, for example, every 30 minutes. As a result, for example, the hot water in the bathtub 2 is kept at the bath set temperature for 4 hours during the automatic operation of the bath. Therefore, for example, the stop of the hot water supply operation may be close to the scheduled start time of the reheating operation.

For example, if the use of hot water is finished 8 minutes before the scheduled start time of the reheating operation every 30 minutes, the hot water supply post fan is performed 5 minutes after the stop of the hot water supply operation, and 8 minutes after the stop of the hot water supply operation. Later, the combustion fan 11 will operate for the reheating operation. Since the combustion fan for reheating and the combustion fan for hot water supply are common, if the combustion fan 11 operates for the reheating operation, it is not necessary to perform the hot water supply post fan immediately before that.

The same applies to the heating operation, and on-off combustion is performed to maintain the room temperature at the set temperature, but it is possible to predict how many minutes later the next combustion will be on from the temperature drop state during the combustion off. For example, combustion may be turned on by the next heating operation 7 minutes after the use of hot water is finished.

Therefore, if a reheating operation or a heating operation is scheduled within a predetermined time (for example, within 10 minutes) after the hot water supply operation is stopped, the hot water supply post fan that is normally performed 5 minutes after the hot water supply operation is stopped is omitted. And control not to do it. That is, the hot water supply post fan is substituted by driving the combustion fan 11 by burning the reheating operation or the heating operation scheduled within a predetermined time.

However, the scheduled reheating operation and heating operation may be canceled. For example, as a result of driving the bath circulation pump 19 in the heat retention operation of the bath, the temperature of the bathtub water does not drop so much, and it may be decided not to perform the scheduled next reheating operation. In addition, the user may perform an operation to stop the automatic operation of the bath before the scheduled time of the next reheating operation comes. Therefore, if the schedule for the reheating operation or heating operation that caused the omission of the hot water supply post fan after the hot water supply is stopped disappears, the point of disappearance is used as the base point (the time of disappearance is 5 minutes before the hot water supply is stopped). Control to run the hot water post fan (after 5 minutes, if any).

FIG. 7 is a flow chart showing control of the post fan after the use of hot water supply is completed.
When the use of hot water supply is completed (step S401; Yes), the control unit 40 of the water heater 10 waits for the timer for securing the Q function to time up (step S402; No). This timer is set to, for example, 5 minutes. The water heater 10 performs hot water temperature holding control on the hot water supply side when the use of hot water is finished. Here, in the hot water temperature holding control on the hot water supply side, combustion of the second burner 14b is prohibited for the same time as the above timer. It shall be.

If the use of hot water supply is resumed before the timer is timed up (step S403; Yes), the combustion fan 11 is operated for combustion of the first burner 14a, so that the hot water supply post fan is unnecessary. This process ends. Even if the second burner 14b burns based on the request for the reheating operation or the heating operation before the timer of the Q function expires, this process is also terminated. For example, this corresponds to the case where the combustion prohibition of the second burner 14b is lifted and the reheating operation is started in step S205; Yes.

If the operation of the water heater 10 is turned off before the timer of the Q function expires (step S404; Yes), the post fan is executed (step S408) to end this process. This post-fan is not a hot-water supply post-fan, but a post-fan that can be turned off (for example, a post-fan that has a longer time than the hot-water supply post-fan).

When the timer of the Q function is timed up (step S402 ;; Yes), it is determined whether or not the second burner 14b is scheduled to be burned due to the reheating operation or the heating operation within a predetermined time (step S405). The predetermined time is fixedly set to, for example, 5 minutes, or the remaining time until the exhaust gas condenses is derived, and the remaining time or a time slightly shorter than the remaining time is set as the predetermined time. In this flow chart, the predetermined time is the time after the timer of the Q function has timed up, but it may be the time after the hot water supply operation is stopped.

If the second burner 14b is not scheduled to burn within a predetermined time (step S405; No), the water heater 10 executes the hot water supply post fan (step S408), and ends this process.

If there is a combustion schedule for the second burner 14b within a predetermined time (step S405; Yes), the water heater 10 starts the combustion of the second burner 14b related to the combustion schedule (step S406; Yes). To finish. If the combustion schedule of the water heater 10 is extinguished by turning off the operation, automatic bath operation, turning off the heating operation, etc. before the combustion of the second burner 14b related to the combustion schedule starts (step S407; Yes), the post The fan is executed (step S408) to end this process. At this time, the water heater 10 performs a hot water supply post fan if the disappearance of the combustion schedule is caused by the automatic operation of the bath or the off of the heating operation, and if it is caused by the operation off of the water heater 10, the operation is turned off. Run the corresponding post fan (for example, a post fan for a longer time than a hot water post fan).

Although the embodiment of the present invention has been described above with reference to the drawings, the specific configuration is not limited to that shown in the embodiment, and there are changes and additions within a range that does not deviate from the gist of the present invention. Is also included in the present invention.

In the embodiment, the circulation path is a heating circuit, but a circuit or the like that circulates the heat medium fluid for the mist sauna may be used.

In the embodiment, the operation request of the heating operation is prohibited or the required heat amount is limited only when the immediately preceding hot water supply operation is the shower use, but the predetermined value after the hot water supply operation is stopped regardless of whether the shower is used or not. The period may be configured to prohibit the transmission of operation requests or limit the amount of heat required.

The heat radiating device 70 stops the blower fan 73 or slows down the operation speed of the blower fan 73 when the transmission of the operation request for the heating operation is prohibited. When the amount of heat required by the operation request for the heating operation is limited, the operation speed of the blower fan 73 is limited to a low speed.

When the water heater 10 transmits information such as the operating status of the water heater 10 and the detection temperature of various sensors to the heat radiating device 70, the prohibited / restricted state is continued for a predetermined time based on the information. You may change the length. For example, the length of the predetermined time for continuing the prohibited / restricted state is changed based on information such as the outside air temperature, the temperature of the first heat exchanger 15, and the wind strength at the place where the water heater 10 is installed.

Specifically, when the water heater 10 has the hot water supply heat exchange temperature sensor 44 and notifies the temperature of the first heat exchanger 15 from the water heater 10 to the heat radiating device 70, the first heat exchange after the hot water supply operation is stopped. The length of the predetermined time for continuing the prohibited / restricted state is changed based on the degree of decrease in the temperature of the vessel 15. Specifically, the heat radiating device 70 sets a specified time in the timer in step S205 of FIG. After that, the state of the temperature drop of the first heat exchanger 15 is monitored, and if the degree of the temperature drop is less than the standard, the Q function can be satisfied even if the operation of the combustion fan 11 is restarted early, so that the timer times up. Change the remaining time until it is shortened.

Further, when the water heater 10 does not notify the detection temperature of the hot water supply heat exchange temperature sensor 44, but notifies the heat dissipation device 70 of the outside air temperature detected by the outside air temperature sensor 45, or the outside air temperature and the wind strength at the installation location. Based on the outside air temperature or the outside air temperature and the strength of the wind, the degree of decrease in the temperature of the first heat exchanger 15 after the hot water supply operation is stopped is estimated, and the greater the degree of decrease in temperature, the longer the time. In addition, the time set in the timer may be changed.

For example, in the summer when the outside air temperature is high, the degree of decrease in the temperature of the first heat exchanger 15 is small, so the time set in the timer is shortened, the prohibited / restricted state is released early, and the combustion fan 11 operates. Also, the Q function can be achieved until the lapse of 5 minutes. The reason why the strength of the wind at the installation location is taken into consideration is that when the wind is strong, this wind flows in from the exhaust port to cool the first heat exchanger 15. Since the load applied to the combustion fan 11 changes due to the influence of the wind, the strength of the wind is based on the magnitude of the electric power and current required to drive the combustion fan 11 for a unit time in the hot water supply operation immediately before the hot water supply operation is stopped. You can judge.

Although the water supply device 10 exemplifies a latent heat recovery type having a first latent heat exchanger 15a, a first latent heat exchanger 15b, a second latent heat exchanger 16a, and a second latent heat exchanger 16b. A type that does not have a latent heat exchanger and has only a latent heat exchanger may be used.

1 ... Hot water supply system 2 ... Bathtub 10 ... Water dispenser 11 ... Combustion fan 12 ... Exhaust port 13 ... Combustion chamber 13a ... 1st combustion chamber 13b ... 2nd combustion chamber 14a ... 1st burner 14b ... 2nd burner 15 ... 1st heat Exchanger 15a ... 1st latent heat exchanger 15b ... 1st visible heat exchanger 16 ... 2nd heat exchanger 16a ... 2nd latent heat exchanger 16b ... 2nd latent heat exchanger 17 ... Systurn 18 ... Circulation pump 19 ... Bath circulation pump 21 ... Pipe 22 ... Flow control valve 23 ... Water-water heat exchanger 24 ... Pipe 25 ... Pipe 26 ... Pipe 28 ... Confluence 31 ... High temperature outbound pipe 32 ... High temperature return pipe 33 ... Thermal valve 34 ... Low temperature return pipe 35 ... Low temperature return pipe 36 ... Bath return pipe 37 ... Bath return pipe 38 ... Connecting pipe 38b ... Bypass pipe 39 ... Flow control valve 40 ... Control unit 41 ... Heat exchange temperature sensor 42 ... Return temperature Sensor 43 ... Water supply temperature sensor 44 ... Hot water supply heat exchange temperature sensor 45 ... Outside air temperature sensor 46 ... Communication unit 47 ... Bath remote control 48 ... Main remote control 49 ... Low temperature going temperature sensor 51 ... Water supply pipe 52 ... Hot water supply pipe 53 ... Water volume sensor 54 ... Water volume servo 55 ... Bypass pipe 56 ... Bypass mixing valve 57 ... Connecting pipe 58 ... Hot water injection electromagnetic valve 59 ... Check valve 61 ... Water injection pipe 62 ... Electromagnetic valve 64 ... Gas supply pipe 65 ... Original gas electromagnetic valve 66 ... Gas proportional valve 67 ... Gas electromagnetic valve 68 ... Gas electromagnetic valve 70 ... Heat exchanger 71 ... Heat exchanger 72 ... Thermal valve 73 ... Blower fan 75 ... Communication unit 76 ... Operation panel 77 ... Room temperature sensor 80 ... Second heat exchanger 81 ... Heat exchanger

Claims (6)

A hot water supply system equipped with a water heater and a heat radiating device using the water heater as a heat source.
The water heater
The first combustion chamber and
A first heat exchanger housed in the first combustion chamber and through which a hot water supply pipe passes.
A first burner for heating the first heat exchanger and
The second combustion chamber and
A second heat exchanger housed in the second combustion chamber and through which a pipe of a predetermined circulation path through which the radiator of the heat radiating device is inserted passes.
A circulation pump provided in the circulation path and
A second burner for heating the second heat exchanger and
A combustion fan in which at least one of the first burner and the second burner operates during combustion to blow combustion air to both the first combustion chamber and the second combustion chamber.
When there is water flowing through the hot water supply pipe, the first burner is burned to supply hot water at a set temperature for hot water supply, and the circulation pump is operated in response to an operation request from the heat radiating device. A control unit that controls a circulating fluid heating operation in which the fluid circulating in the circulation path is heated by the second burner.
A communication unit that communicates with the heat dissipation device,
With
The control unit transmits hot water supply operation information indicating the operating state of the hot water supply operation to the heat radiating device using the communication unit.
The heat radiating device determines whether or not it is a predetermined period after the water heater stops the hot water supply operation based on the hot water supply operation information received from the water heater, and transmits the operation request during the predetermined period. A hot water supply system characterized in that the amount of heat required by the operation request is limited to a predetermined amount or less. The hot water supply system according to claim 1, wherein the predetermined period is a period after the stop of the hot water supply operation, before the restart of the hot water supply operation, and before the predetermined time elapses from the stop of the hot water supply operation. .. When the operation instruction of the own device continues from before the end of the predetermined period to after the end of the predetermined period, the heat radiating device makes the operation request including the compensation instruction after the end of the predetermined period.
The hot water supply according to claim 1 or 2, wherein when the water heater receives an operation request including the replenishment instruction, the operation speed of the circulation pump is increased more than usual to perform the circulation fluid heating operation. system. The heat dissipation device, based on the hot water supply operation information, the hot water supply operation water heater is stopped, it is determined whether or not to use the shower, only if a hot water supply operation to use the shower, the Any one of claims 1 to 3, characterized in that transmission of the operation request is prohibited during a predetermined period after the hot water supply operation is stopped, or the amount of heat required by the operation request is limited to a predetermined amount or less. The hot water supply system described in one. The hot water supply system according to any one of claims 1 to 4, wherein the control unit prohibits a post fan based on the suspension of the hot water supply operation for the predetermined period. The control unit does not perform a post-fan based on the stop of the hot water supply operation when the circulating fluid heating operation is scheduled within a predetermined period after the stop of the hot water supply operation. The hot water supply system according to any one of 5.

Images