JP2018091542A - Hot water supply system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hot water supply system in which a hot water supply temperature is not significantly lowered in restarting hot water supply within a fixed time after stop of hot water supply.SOLUTION: A water heater 10 includes a first combustion chamber 13a accommodating a first heat exchanger 15 for hot water supply and a first burner 14a, a second combustion chamber 13b accommodating a second heat exchanger 16 for an air heating circuit and a second burner 14b, and a combustion fan 11 operated in combustion of at least one of the first and second burners 14a 14b to send air to both of the first and second combustion chambers 13a, 13b. A heat radiation device 70 receives information indicating an operating state of hot water supply motion from the water heater 10, and stops transmission of an operation request for air heating operation for a prescribed time after termination of use of supply hot water. As combustion of both of the first burners 14a and the second burners 14b is stopped after stop of hot water supply, and the combustion fan 11 is stopped, lowering of a temperature of the first heat exchanger 15 by the air blown from the combustion fan 11 is suppressed.SELECTED DRAWING: Figure 1

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.

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

JP-A-2005-337531

  From the viewpoint of ensuring comfort when using the shower, for example, ± 3 fluctuations in the hot water temperature when the hot water supply operation is resumed before a certain time (for example, 5 minutes) has elapsed since the hot water supply operation was stopped. A function (referred to as Q function) that keeps the temperature within the temperature is desired.

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

  The present invention is intended to solve the above-described problem, and an object thereof is to provide a hot water supply system in which the hot water temperature does not significantly decrease when hot water supply is resumed within a certain time after hot water supply is stopped.

  The gist of the present invention for achieving the 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 is
A first combustion chamber;
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;
A second combustion chamber;
A second heat exchanger that is housed in the second combustion chamber and through which a pipe of a predetermined circulation path through which a radiator of the heat dissipation device is inserted;
A circulation pump provided in the circulation path;
A second burner for heating the second heat exchanger;
A combustion fan that operates during combustion of at least one of the first burner and the second burner and blows combustion air to both the first combustion chamber and the second combustion chamber;
Hot water supply operation for burning the first burner to supply hot water at a hot water supply set temperature when there is water in the hot water supply pipe, and operating the circulation pump in response to an operation request from the heat radiating device A controller for controlling a circulating fluid heating operation for heating the fluid circulating in the circulation path by the second burner;
A communication unit communicating with the heat dissipation device;
With
The control unit transmits hot water supply operation information indicating an operation state of the hot water supply operation to the heat dissipation device using the communication unit,
The heat dissipating device determines whether or not the water heater is in a predetermined period after stopping 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. Or the amount of heat required by the operation request is limited to a predetermined amount or less.

  In the said invention, transmission of the operation request | requirement from a thermal radiation apparatus to a water heater is prohibited etc. for the predetermined period after the hot water supply operation | movement stop. As a result, if the hot water supply operation is not resumed after the hot water supply operation is stopped, the combustion fan is maintained in a stopped state (or in a small air volume state), and the hot water supply side heat exchanger (first heat exchange) by air blown from the combustion fan is maintained. The cooling of the hot water supply) is suppressed, and a significant decrease in the temperature of the hot water when the hot water supply is resumed is prevented.

[2] The predetermined period is a period after the hot water supply operation is stopped, before the hot water supply operation is restarted, and before a predetermined time elapses from the stop of the hot water supply operation. Hot water system.

[3] When the operation instruction of the heat radiating device continues from before the end of the predetermined period to after the end of the predetermined period, the heat dissipation device performs the operation request including a compensation instruction after the end of the predetermined period. ,
[1] or [2], wherein the water heater performs the circulating fluid heating operation at a higher operating speed than usual when the operation request including the compensation instruction is received. Hot water 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, In the circulating fluid heating operation after the prohibition or the like is canceled, the operation speed of the circulation pump is increased more than usual.

[4] Based on the hot water supply operation information, the heat radiating device determines whether the hot water supply operation stopped by the water heater is for a shower, and only when the hot water supply operation is for a shower. [1] to [3], wherein 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 in the operation request is limited to a predetermined amount or less. A hot water supply system according to any one of the above.

  In the above invention, only when it is estimated that the use of hot water just before the stop of hot water supply is a shower, the control for prohibiting or requesting the transmission of the operation request is performed.

[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 stop of the hot water supply operation during 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 hot water supply operation is stopped. The hot water supply system according to any one of [1] to [5].

  In the above invention, when the circulating 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 for the operation of the combustion fan accompanying the circulating fluid heating operation.

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

It is a figure showing the composition of the outline of the hot-water supply system concerning an embodiment of the invention. It is a flowchart which shows control of operation | movement of a combustion fan. It is a flowchart which shows the process which transmits the operation state information which shows the operation state of the hot water supply operation | movement which a hot water heater performs. It is a flowchart which shows the process in which a water heater controls circulation system operation | movement according to the operation | movement request | requirement from a thermal radiation apparatus. It is a flowchart which shows the process which cancels | releases setting prohibition and restriction | limiting of an operation | movement request which a thermal radiation apparatus performs. It is a flowchart which shows the process which a thermal radiation apparatus transmits an operation request to a water heater. It is a flowchart which shows control of the post fan at the time of completion | finish of hot water supply use.

  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, and a heat radiating device 70 and a second heat radiating device 80 that use the water heater 10 as a heat source. The water heater 10 heats the water supply and supplies hot water to the shower in the bathroom or the kitchen faucet, etc., the pouring function to drop the hot water into the tub 2, and the hot water in the tub 2 It has a reheating function that raises the temperature. In addition, hot water at a set temperature is automatically filled in the bathtub 2 so as to reach a set water level, and after completion of the hot water filling, the set water level and the set temperature are maintained for a predetermined time (for example, 4 hours). It is equipped with an automatic bath operation function for retreating.

  Furthermore, the water heater 10 has a heat source function for circulating a heated heat medium fluid (here, referred to as hot water) through 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, and is a bathroom heater that sends warm air to warm a 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 cylindrical combustion chamber 13 into which air blown by the combustion fan 11 is sent from below and provided with an exhaust port 12 at the top. The combustion chamber 13 is divided into a first combustion chamber 13a and a second combustion chamber 13b by partitioning vertically with a partition plate. The combustion fan 11 is shared by the first combustion chamber 13a and the second combustion chamber 13b, and supplies air for combustion by simultaneously blowing air to both the first combustion chamber 13a and the second combustion chamber 13b.

  A first burner 14a is provided at the lower portion of the first combustion chamber 13a, and a first heat exchanger 15 through which a hot water supply pipe passes is disposed above. The first heat exchanger 15 includes a latent heat exchanger 15a and a sensible heat exchanger 15b. A second burner 14b is provided in the lower part of the second combustion chamber 13b, and a second heat exchanger 16 through which piping constituting a predetermined circulation path passes is disposed above the second burner 14b. The second heat exchanger 16 includes a second latent heat exchanger 16a and a second sensible heat exchanger 16b. The combustion fan may be provided individually 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, Both combustion fans are controlled to operate.

  Here, the circulation path includes the basic path, the high-temperature heating path branched from the basic path via the radiator 71 of the heat dissipation device 70, and the radiator 81 of the second heat dissipation apparatus 80 branched from the basic path. It is composed of a low-temperature heating path that passes through and a reheating circuit for reheating hot water in the bathtub 2.

  The basic path is from the outlet side of the second sensible heat exchanger 16b through the pipe 21, the flow control valve 22, the primary side pipe of the water-water heat exchanger 23, the pipe 24, and the pipe 25. It is composed of a path that reaches the second latent heat exchanger 16a, passes through the cistern 17 and the circulation pump 18 from the outlet side of the second latent heat exchanger 16a, and then returns to the inlet side of the second sensible heat exchanger 16b through the conduit 26. Is done. Further, the basic path is a connecting pipe that connects the pipe line 21 connected to the outlet side of the second sensible heat exchanger 16b and the pipe line 26 between the outlet side of the first sensible heat exchanger 15b and the cistern 17. 38. A flow rate adjustment valve 39 is provided in the middle of the connecting pipe 38, and a bypass pipe 38 b that bypasses the flow rate adjustment valve 39 is provided.

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

  The high-temperature heating path includes any one of the high-temperature forward pipe 31 that branches from the pipe 21 and reaches the inlet side of the radiator 71 via the thermal valve 72 included in the radiator 70, and the junction 28 from the outlet side of the radiator 71. And a high-temperature return pipe 32 leading to one entry side connection port. The pipeline 29 connected to the outlet side of the junction 28 is connected to the junction of the pipeline 25 and the pipeline 24 and merges.

  The low-temperature heating path branches from the pipe line 26 downstream of the circulation pump 18, and passes through the thermal valve 33 to reach the inlet side of the radiator 81 of the second radiator 80, and the radiator 81. And a high-temperature return pipe 35 extending from the outlet side to any one inlet side connection port of the junction 28.

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

  A heat exchange temperature sensor 41 for detecting the temperature of hot water coming out of the second sensible heat exchanger 16b is provided in the pipe line 21 connected to the outlet side of the second sensible heat exchanger 16b. The pipe 25 connected to the inlet side of the second latent heat exchanger 16a is provided with a return temperature sensor 42 for detecting the temperature of hot water returning to the second latent heat exchanger 16a. The bath return pipe 37 is provided with a bath return temperature sensor 40. The pipe 26 immediately downstream of the circulation pump 18 is provided with a low temperature going-out temperature sensor 49 for detecting the hot water temperature sent to the low temperature heating path.

  A water supply pipe 51 that receives supply of water from a 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 connected to the inlet side of the first sensible heat exchanger 15b. A hot water supply pipe 52 leading to the 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 quantity servo 54 for adjusting (limiting) the water supply from the water supply source is provided downstream of the water supply sensor 51. It is provided.

  A 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 a predetermined position of the hot water supply pipe 52. In the middle of the bypass pipe 55, a bypass mixing valve 56 for adjusting the amount of water supplied from the water supply pipe 51 to the hot water supply pipe 52 through the bypass pipe 55 is provided.

  The water supply pipe 51 upstream 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 in the vicinity of the place where the bath return temperature sensor 40 is provided and the hot water supply pipe 52 at a predetermined location downstream from the joining location of the bypass pipe 55 are connected by a connecting pipe 57. A hot water solenoid valve 58 for switching the connecting pipe 57 between the open state and the shut off state and a check valve 59 for preventing a back flow from the bath return pipe 37 side to the hot water supply pipe 52 are inserted in the middle of the operation. ing.

  In addition, a water injection pipe 61 branched in the middle of the water supply pipe 51 leads to the cistern 17, and an electromagnetic valve 62 for switching the water injection pipe 61 between an open state and a shut-off state is interposed in the water injection pipe 61. Yes. When the solenoid valve 62 is opened, the cistern 17 is replenished with water.

  The combustion gas supply path is as follows. In the middle of the gas supply pipe 64 connected to the combustion gas supply source, an original gas solenoid valve 65 for switching whether or not to block the combustion gas from the supply source is provided, and downstream of the supply combustion gas A gas proportional valve 66 is provided for arbitrarily adjusting the amount of gas. The gas supply pipe 64 branches into two downstream of the gas proportional valve 66, one of which is connected to the first burner 14 a via the gas electromagnetic valve 67, and the other is connected to the second burner via the gas electromagnetic valve 68. 14b.

  In addition, the water heater 10 has an outside air temperature sensor 45 that detects the outside air temperature. Furthermore, the water heater 10 includes a control unit 40 that controls the operation of the water heater 10. The control unit 40 is configured by a circuit having a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), and the like as main parts, and the CPU executes various processes according to programs stored in the ROM. Thus, 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 operation status, and the heat dissipation device 70 and the second heat dissipation. Serves to communicate with the device 80. Here, there are a bath remote controller 47 installed in a bath and a main remote controller 48 installed in a kitchen or the like as remote controllers.

  The heat radiating device 70 includes a heat radiating device 71, a blower fan 73 that blows air toward the heat radiating device 71 so that the hot air received by the heat radiating device 71 exits from the blowout port, 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. 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 dissipation device 70 includes a room temperature sensor 77 that detects the ambient temperature.

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

  Next, an outline of the 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 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 in the first burner 14a. Let The water supply 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 sensible heat exchanger 15b), When the bypass mixing valve 56 is open, it is further mixed with the feed water from the bypass pipe 55 and then 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 temperature becomes the hot water supply set temperature. When the water amount sensor 53 stops detecting water flow, 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 pouring operation is executed when an instruction for automatic bath operation or pouring is received from the bath remote controller 47 or the main remote controller 48. In the pouring operation, the control unit 40 opens the pouring electromagnetic valve 58, operates the combustion fan 11, and ignites the first burner 14a to burn the combustion gas. Thereby, 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 outlet pipe 36. When the hot water in the bathtub 2 reaches the set water level, the pouring operation is stopped. Specifically, the hot water solenoid valve 58 is closed, the supply of the combustion gas to the first burner 14a is shut off, and the combustion fan 11 is stopped.

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

  In the reheating operation, the control unit 40 opens the flow rate 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. To burn the combustion gas. Due to 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 that has exited the second sensible heat exchanger 16b of the second heat exchanger 16 passes through the primary side of the flow rate control valve 22 and the water-water heat exchanger 23 from a branch point in the middle of the pipe line 21, Then, it circulates through the conduit 24, the conduit 25, the second latent heat exchanger 16a, the cistern 17, the circulation pump 18, and the conduit 26 to reach the second sensible heat exchanger 16b. Although the flow rate adjustment valve 39 is closed, a part of the hot water passing through the outlet side pipe 21 of the second sensible heat exchanger 16b passes through the connecting pipe 38 and the bypass pipe 38b upstream of the cistern 17. 26.

  In parallel with the above operation, the bath circulation pump 19 causes the bath water in the bathtub 2 to pass from the bath return pipe 37 through the water pipe on the secondary side of the water-water heat exchanger 23 and through the bath outlet pipe 36. Circulate to return to bathtub 2. The circulating water circulating in the circulation path is heated by the second heat exchanger 16 and the heat is circulated through the primary side of the water-water heat exchanger 23 when passing through the primary side of the water-water heat exchanger 23. Move to water to raise the temperature of the bath water.

<Heating operation>
The heating operation (circulating fluid heating operation) is performed based on an operation request from the heat dissipation device 60. When the heat dissipation device 60 receives an instruction to turn on the heating operation from the user on the operation panel 66, the heating set temperature set on the operation panel 66 is compared with the room temperature detected by the room temperature sensor 67, and the room temperature is heated. An operation request for the heating operation is transmitted to the water heater 10 so that the set temperature is reached. The operation request includes information indicating the requested amount of heat.

The control unit 45 of the water heater 10 that has received the operation request for the heating operation from the heat radiating device 60 operates the circulation pump 17, operates the combustion fan 11, ignites the second burner 14 b, and causes the second burner 14 b to ignite. Burn the combustion gas. Hot water is circulated in the heating circuit by the action of the circulation pump 17. The circulating hot water is heated by receiving the heat of the exhaust from the second heat exchanger 15b when passing through the second burner 14b, and dissipates heat when passing through the radiator 61 of the heat radiating device 60. 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 and circulated through the high-temperature heating path, and a low-temperature heating operation in which hot water of about 60 ° C. is sent out and circulated through the low-temperature heating path.

  In the high-temperature heating operation, for example, when the heating operation is turned on by the operation panel 76 of the heat dissipation device 70 that is a high-temperature heating terminal, the heat dissipation device 70 energizes the thermal valve 72 and the heating operation on instruction (high-temperature heating). Request) 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 made to the water heater 10 so that the room temperature becomes the heating set temperature. Send. The operation request includes information indicating the requested amount of heat.

  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 even when it is energized, and opens, for example, after about 1 minute has elapsed since the start of energization. Therefore, initially (assuming that the flow control valve 22 and the thermal valve 33 in the low-temperature heating path are closed), the circulating water sent out by the circulation pump 18 is the second manifestation of the second heat exchanger 16. After being heated by the heat heat exchanger 16b, it does not go from the pipe line 21 to the high temperature outgoing pipe 31, but passes through the connecting pipe 38 and the bypass pipe 38b, and further circulates through a short path to the circulation pump 18 through the cistern 17. . Therefore, the detected temperature of the heat exchange temperature sensor 41 reaches about 80 ° C. in about the first 10 seconds, and the second burner 14b is turned off. Thereafter, the combustion of the second burner 14b is turned off until the thermal valve 72 is opened (for example, about 50 seconds).

  When the thermal valve 72 is opened, the circulating water sent out by the circulation pump 18 is heated by the second sensible heat exchanger 16 b of the second heat exchanger 16, the pipe line 21, the high temperature outgoing pipe 31, and the heat radiating device 70. It circulates through the valve 72 and the radiator 71, the high temperature return pipe 32, the junction 28, the pipe 29, the pipe 25, the second latent heat exchanger 16 a, and the path leading to the circulation pump 18 through the cistern 17. A part of the hot water passing through the outlet pipe 21 of the second sensible heat exchanger 16b flows into the pipe 26 upstream of the cistern 17 through the connecting pipe 38 and the bypass pipe 38b.

  When the circulation is started in such a path, the cold circulating water in the high-temperature forward pipe 31 and the high-temperature return pipe 32 outside the hot water heater 10 enters the hot water heater 10. Combustion of the second burner 14b is started in order to maintain the temperature of hot water sent out toward the apparatus 70 (detection temperature of the heat exchanger temperature sensor 41) at 80 ° C. Thereafter, the combustion is continued for about 5 minutes, but when the bathroom warms up, the combustion is turned on / off and the temperature detected by the heat exchanger temperature sensor 41 is maintained at 80 ° C. In addition, when the flow control valve 22 is open, the circulating water flowing out from the second sensible heat exchanger 16b and flowing through the pipe line 21 branches, and a part of the circulating water flows through the primary side of the water-water heat exchanger 23. Then, the fluid flows so as to reach the conduit 24 and the conduit 25.

  In the low-temperature heating operation, for example, when an operation for turning on the heating operation is received by a remote controller (for example, a remote controller for floor heating) of the second radiator 80 that is a low-temperature heating terminal, an instruction to turn on the low-temperature heating operation from the remote controller ( The operation request for low-temperature heating) is transmitted to the control unit 40 of the water heater 10. Receiving this instruction, the water heater 10 starts energizing the thermal valve 33, turns on the circulation pump 18, and burns the second burner 14b to operate 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 Then, it waits in the state which turned off the combustion of the 2nd burner 14b until the thermal valve 33 opens.

  When the thermal valve 33 opens, the circulating water sent out by the circulation pump 18 branches downstream of the circulation pump 18, and one of them is the thermal valve 33, the low-temperature forward pipe 34, and the radiator of the second radiator 80. 81, the low-temperature return pipe 35, the junction 28, the pipe line 29, the second sensible heat exchanger 16 b of the second heat exchanger 16, and the flow to the circulation pump 18 through the cistern 17. The other branched portion is heated by the second sensible heat exchanger 16b, and then flows through the connecting pipe 38 (bypass pipe 38b and flow rate adjusting valve 39) to the circulation pump 18 through the cistern 17.

  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 adjustment valve 39 is opened so that more hot water heated by the second sensible heat exchanger 16b is mixed with hot water going to the high temperature outgoing pipe 31. In addition, the combustion amount of the second burner 14b is controlled so that the temperature detected by the heat exchanger temperature sensor 41 is 80 ° C. (or 90 ° C.). On the other hand, in the normal low-temperature heating operation after the completion of the hot dash operation, the flow rate adjustment valve 39 is closed (or the opening degree is reduced), and the temperature detected by the low-temperature forward temperature sensor 49 downstream of the circulation pump 18 is 60 ° C. The combustion amount of the second burner 14b is controlled so that

  The hot water heater 10 can execute a hot water supply operation, a heating operation, and a reheating operation in parallel. However, in the hot water supply system 1 according to the present invention, the hot water supply when the hot water supply operation is resumed is performed 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) is performed such that the heating operation or the reheating operation (combustion of the second burner 14b) is not performed.

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

  Hereinafter, hot water supply side hot water temperature holding control in the case of suppressing the heating operation based on the operation request from the heat radiating device 70 will be described. Further, it is assumed that there is no request for reheating or low temperature heating.

  The water heater 10 transmits hot water operation information indicating the operation state of the hot water operation to the heat radiating device 70, and the heat radiating device 70 that has received the information is based on the hot water 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, a control (hot water supply side hot water temperature holding control) is performed such that transmission of the operation request for the heating operation is prohibited or the amount of heat required by the operation request is limited to a predetermined amount or less. . Here, for the 5 minutes after the hot water supply operation is stopped, the above control is performed so that the Q function is maintained within ± 3 ° C. (atmosphere temperature is normal temperature and water supply temperature is 16 ° C.) when hot water is resumed. I do.

  Further, the effect of improving the comfort by the Q function appears notably when the hot water supply is used for a shower. That is, when the shower is stopped once during use and the user reuses the shower, the user feels the fluctuation of the hot water temperature throughout the body. On the other hand, when the hot water is discharged from a faucet in a kitchen or the like, the user only touches the finger, so there is little discomfort due to the temperature drop. Therefore, the hot water supply side hot water temperature maintaining control is executed only when the use of the hot water supply just before is a shower. Thereby, since the case where the heating operation is prohibited or restricted by the hot water supply side hot water temperature holding control is limited, the influence of the heat radiating device 70 on the heating effect can be reduced.

  FIG. 2 is a flowchart showing the 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 controller 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 operation speed corresponding to the combustion amount ( Step S102). That is, the control is performed such that the operation speed of the combustion fan 11 is decreased as the combustion amount is decreased, and the operation speed of the combustion fan 11 is increased as the combustion amount is increased. Thereafter, 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 flowchart showing processing 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 dissipation device 70 (step S122). Thereafter, when the hot water supply operation is stopped (step S123; Yes), it is determined whether or not the immediately preceding hot water supply operation is a hot water using a 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 use of the shower, it is determined that the immediately preceding hot water usage is 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 the priority to change the hot water set temperature, it is determined that the shower is used.

  If it is determined that the immediately preceding hot water supply operation is due to the use of a shower (step S124; Yes), the hot water supply operation is stopped, and hot water supply operation information indicating that the stopped hot water supply operation is a shower use is created to dissipate heat. It transmits to the apparatus 70 (step S125). On the other hand, if 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 used for showering is created in the heat dissipation device 70. Transmit (step S126).

  FIG. 4 is a flowchart showing an operation performed by the water heater 10 regarding the heating operation. It is monitored whether or not there is an operation request for heating operation from the heat dissipation device 70 (step S141). If the operation request | requirement of heating operation is received from the thermal radiation apparatus 70 (step S141; Yes), it will be judged whether the compensation instruction | indication is included in this operation request | requirement (step S142). When the compensation instruction is not included (step S142; No), the operation speed of the circulation pump 18 is set to the normal mode, and the heating operation is executed with the combustion amount corresponding to the requested amount of heat (step S143). Transition.

  When a compensation instruction is included in the operation request (step S142; Yes), the operation speed of the circulation pump 18 is set to a high-speed mode faster than normal, and the heating operation is executed with the combustion amount corresponding to the requested amount of heat (step S143). ), The process proceeds to step S145.

  In step S145, reception of the operation request from the heat radiating device 70 is monitored, and if the operation request is continued (step S145; No), the process returns to step S142 and the process is continued. 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 being performed, combustion of both the first burner 14a and the second burner 14b is stopped by stopping the heating operation, and thus the combustion fan 11 is stopped.

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

  FIG. 5 shows a flow of hot water supply side hot water temperature maintaining control 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 the water heater 10 is in the hot water supply operation (step S 201), if it is determined that the hot water supply operation has ended (step S 202; Yes), the hot water supply operation stopped immediately before is It is determined whether or not it has been used (step S203). If it is not shower use (step S203; No), it will return to step S201.

  In the case of using the shower (step S203; Yes), transmission of the operation request for the heating operation is prohibited or set to a state (prohibited / restricted state) that restricts the amount of heat required (step S204). Then, a timer for measuring a predetermined time is started (step S205). This timer measures the time until the prohibition / restriction state is canceled. In the water heater 10, since the first burner 14a is not combusted after the hot water supply operation is finished, if the transmission of the operation request for the heating operation is prohibited, the combustion of the second burner 14b is stopped. As a result, the first burner 14a, Both of the two burners 14b do not combust and the combustion fan 11 stops.

  The heat dissipation device 70 does not transmit an operation request for the heating operation to the water heater 10 in the first place unless it receives an instruction for the heating operation from the user. However, if the prohibited / restricted state is set, according to this setting, the operation request for the heating operation is not transmitted, or the amount of heat requested by the operation request for the heating operation is limited.

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

  If the timer has been typed up (step S206; Yes), the prohibition / restriction state is canceled (step S208), and the process returns to step S201. Before the timer expires (step S206; No), when the hot water supply is resumed (step S207; Yes), the prohibition / restriction state is canceled (step S208), and the process returns to step S101.

  FIG. 6 is a flowchart showing processing performed by the heat dissipation device 70 regarding transmission of an operation request. Waiting to receive an instruction to turn on the heating operation (operation instruction) from the user (step S301; No), and when the operation instruction is received (step S301; Yes), it is set to a prohibited / restricted state by the process shown in FIG. It is checked whether or not it has been 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 is continued (step S313; No), the process returns to step S302, and it is checked whether or not the state is changed to the prohibited / restricted state under the state where the operation request for the heating operation is performed.

  If it is set to the prohibited / restricted state (step S302; Yes), the contents of the prohibited / restricted state are 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. Thereby, 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.

  If the setting is made to limit the requested amount of heat (step S304: restriction), an operation request that restricts the requested amount of heat to a predetermined value or less is transmitted (step 306), and the process proceeds to step S307. In this case, the water heater 10 performs the heating operation while suppressing the combustion amount of the second burner 14b according to the limited heat amount indicated by the request. By suppressing the amount of combustion of the second burner 14b to a small amount, the combustion fan 11 also operates with a small amount of air according to the amount of combustion.

  In step S307, it is determined whether or not the prohibited / restricted state is released. Before the prohibited / restricted state is released (step S307; No), the operation instruction (instruction to turn on the heat dissipation device 70) is completed. In such a case (step S308; Yes), the transmission of the operation request is stopped (step S314), and this process ends. Before the operation instruction ends (step S308; No), if the prohibited / restricted state is released (step S307; Yes), an operation request including a compensation instruction is transmitted to the water heater 10 (step S309). When the operation request including the compensation instruction is received, the water heater 10 rotates the circulation pump 18 at a speed higher than the rotation speed corresponding to the combustion amount while burning the second burner 14b with the combustion amount corresponding to the required heat amount. Operate with a number to perform the heating operation. Thereby, the fall of the heating effect in the period which wants to prohibit heating operation | movement or to restrict | limit heat amount can be compensated for at an early stage.

  When the operation instruction is completed (step S311; Yes), the transmission of the operation request for the heating operation is stopped before the predetermined time has elapsed after the transmission of the operation request including the compensation instruction is started (step S310; No). (Step S314), and this process is terminated.

  When a predetermined time elapses after the transmission of the operation request including the compensation instruction is started (step S310; Yes), a normal operation request not including the compensation instruction is transmitted (step S312). Thereafter, it is determined whether or not the operation instruction has ended. If the operation instruction has ended (step S313; Yes), the transmission of the operation request for the heating operation is stopped (step S314), and the process ends.

  If the operation instruction is continued (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 restricting the amount of heat that is prohibited or required for the transmission of the operation request for the heating operation until the predetermined time elapses after the hot water supply operation ends. It is prevented and suppressed that the temperature of the 1st heat exchanger 15 falls by the ventilation from the combustion fan 11, and Q function is impaired.

  For example, if the hot water supply is used (for example, a shower is used) during the heating operation at an outside air temperature of 7 ° C. and the hot water supply is resumed 4 minutes after the hot water supply is stopped, the above hot water supply side hot water temperature maintaining control must be performed. For example, when the hot water temperature decreases from 40 ° C. to 30 ° C., if the hot water supply side hot water temperature holding control is performed (when the timer setting time is 3 minutes), the hot water temperature only decreases from 40 ° C. to 37 ° C. An effect can be obtained.

  Note that the hot water supply side hot water temperature holding control similar to that of the heat dissipation device 70 may be performed for the second heat dissipation device 80 as well. The hot water supply side hot water temperature maintaining control for the reheating operation (or the reheating operation and the low temperature heating operation by the second heat radiating device 80) restricts the amount of combustion in which the water heater 10 prohibits the combustion of the second burner 14b. Just do it.

Next, post fan control will be described.
After the hot water supply operation is stopped, if the post fan (drive of the combustion fan 11 for exhausting the exhaust gas without combustion) is omitted or the post fan time is shortened, the warm exhaust gas stays in the instrument (combustion chamber 13). (Or more staying). In other words, while preventing the heat exchanger from being cooled by air blown by the hot water supply post fan (post fan accompanying the stop of the hot water supply operation), warm combustion exhaust gas remains in the appliance, so that the next hot water supply operation is performed in a short time. The efficiency of hot water supply in case of breakage increases.

  However, the temperature of the exhaust gas decreases while keeping the warm flue gas in the appliance. At this time, moisture in the exhaust gas may be condensed. Originally, in order to prevent the moisture in the exhaust gas from condensing in the appliance and sticking to the ignition system, for example, a high voltage of the igniter may cause an ignition failure due to a ground fault. Fully exhaust the fan and exhaust the exhaust gas that causes condensation. However, in the water heater 10 according to the present embodiment, after the combustion of the first burner 14a due to the use of hot water is stopped, 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 is Control to shorten the operation time. For this reason, condensation tends to occur.

  Therefore, when the hot water supply operation is stopped when the hot water supply is used alone (combustion stop of the first burner 14a), the water heater 10 immediately stops the combustion fan 11 when the combustion stops, and ensures the Q function for 5 minutes after the combustion stop. Time) is prohibited so that the post fan accompanying the stop of the hot water supply operation is prohibited, and the hot water supply post fan is controlled 5 minutes after the combustion stop. As a result, the flue gas that is likely to condense is discharged out of the instrument before the dew condensation, or moisture that has been dewed is dried to eliminate the cause of ignition failure such as a ground fault. If the post fan is turned off 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 combustion exhaust gas is less likely to condense for a longer time. can do.

  On the other hand, a chasing operation, a heating operation, and a hot water supply operation may be performed simultaneously. 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 restricts the combustion amount in a predetermined time thereafter, 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, there is a case where during the automatic operation of the bath, there is a case of performing an operation of raising the temperature in order to maintain the hot water in the bathtub 2 at the bath set temperature (heat insulation operation). That is, in order to maintain the hot water temperature of the bathtub 2 at the bath set temperature, a chasing operation for increasing the temperature to the set temperature is performed, for example, every 30 minutes. Thereby, 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 chasing operation.

  For example, if the use of hot water supply ends 8 minutes before the scheduled start time of the chasing operation every 30 minutes, the hot water supply post fan is performed 5 minutes after the hot water supply operation is stopped, and further 8 minutes after the hot water supply operation is stopped. The combustion fan 11 will be operated later 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 in order to maintain the room temperature at the set temperature, but it is possible to predict how many minutes after the next combustion on from the state of temperature decrease during combustion off. For example, there may be a case where combustion on by the next heating operation is scheduled 7 minutes after the use of hot water supply ends.

  Therefore, when 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. In other words, the hot water supply post fan is used instead of the combustion fan 11 driven by combustion in a reheating operation or heating operation scheduled within a predetermined time.

  However, there are cases where the planned reheating operation or heating operation is stopped. For example, as a result of driving the bath circulation pump 19 in the bath warming operation, there is a case where the temperature of the bath water does not decrease so much and a decision is made not to perform the scheduled next chase operation. Further, there is a case where the user performs an operation to stop the automatic bath operation before the scheduled time for the next chasing operation comes. Therefore, if the schedule of the reheating operation or heating operation that caused the omission of the hot water supply post fan after the stoppage of hot water use disappears, the point of disappearance becomes the base point (the extinction time is 5 minutes after the hot water supply stop. Control to perform hot water supply post fan (after 5 minutes if any).

FIG. 7 is a flowchart showing the control of the post fan after the use of hot water is completed.
When the use of hot water supply ends (step S401; Yes), the control unit 40 of the water heater 10 waits for the timer for ensuring the Q function to expire (step S402; No). This timer is set, for example, for 5 minutes. The hot water supply device 10 performs hot water supply side hot water temperature holding control when the use of hot water supply ends, but here, in the hot water supply side hot water temperature holding control, combustion of the second burner 14b is prohibited for the same time as the above timer. Shall.

  If the use of hot water is resumed before the timer expires (step S403; Yes), the combustion fan 11 is activated for the combustion of the first burner 14a, so the hot water supply post fan is not necessary. This process ends. Note that this processing is also ended when the second burner 14b burns based on a request for a reheating operation or a heating operation before the timer for the Q function expires. For example, this is the case when the combustion prohibition of the second burner 14b is canceled and the reheating operation is started in Step S205; Yes.

  If the operation of the water heater 10 is turned off before the timer for the Q function expires (step S404; Yes), the post fan is executed (step S408), and the process is terminated. This post fan is not a hot water supply post fan, but a post fan corresponding to operation off (for example, a post fan having a longer time than the hot water supply post fan).

  When the timer of the Q function is up (step S402; Yes), it is determined whether or not there is a combustion schedule of the second burner 14b accompanying the reheating operation or the heating operation within a predetermined time (step S405). For example, the predetermined time is fixedly set to a time such as 5 minutes, or the remaining time until the exhaust is condensed is derived, and the remaining time or a time slightly shorter than the remaining time is set as the predetermined time. In this flowchart, the predetermined time is the time after the timer of the Q function has timed up, but it may be the time since the hot water supply operation was stopped.

  If there is no plan to burn the second burner 14b within the predetermined time (step S405; No), the water heater 10 executes a hot water supply post fan (step S408) and ends this process.

  If there is a combustion schedule of the second burner 14b within the predetermined time (step S405; Yes), the hot water heater 10 performs this processing when the combustion of the second burner 14b according to the combustion schedule starts (step S406; Yes). Exit. When the combustion schedule of the hot water heater 10 disappears before the combustion of the second burner 14b related to the combustion schedule is started, such as when the operation is turned off, automatic bath operation, or heating operation is turned off (step S407; Yes), the post The fan is executed (step S408), and this process is terminated. At this time, the hot 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 heating operation being turned off, and when the hot water heater 10 is caused by the operation being turned off, the operation is turned off. A corresponding post fan (for example, a post fan having a longer time than a hot water supply post fan) is executed.

  The embodiment of the present invention has been described with reference to the drawings. However, the specific configuration is not limited to that shown in the embodiment, and there are changes and additions within the scope of the present invention. Are also included in the present invention.

  In the embodiment, the circulation path is a heating circuit, but it may be a circuit for circulating a heat medium fluid for a mist sauna.

  In the embodiment, the operation request for the heating operation is prohibited or limited only when the immediately preceding hot water supply operation is a shower use, but the predetermined amount 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 the operation request and limit the amount of heat required.

  Note that the heat dissipation device 70 stops the blower fan 73 or reduces the operation speed of the blower fan 73 in a state where transmission of the operation request for the heating operation is prohibited. When the amount of heat requested 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 operation status of the water heater 10 and detection temperatures of various sensors to the heat radiating device 70, a predetermined time for continuing the prohibited / restricted state based on the information. The length may be changed. For example, the length of the predetermined time during which the prohibited / restricted state is continued is changed based on information such as the outside air temperature, the temperature of the first heat exchanger 15, and the strength of the wind at the place where the water heater 10 is installed.

  More specifically, when the water heater 10 has the hot water heat exchanger 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 during which the prohibited / restricted state is continued is changed based on the temperature decrease degree of the vessel 15. Specifically, the heat dissipation device 70 sets a specified time for the timer in step S205 of FIG. Thereafter, the temperature decrease state of the first heat exchanger 15 is monitored, and if the degree of temperature decrease is less than the reference, the Q function can be satisfied even if the operation of the combustion fan 11 is restarted early, so the timer times out. Change the remaining time until

  In addition, the water heater 10 does not notify the temperature detected by the hot water supply heat exchange temperature sensor 44 and notifies the heat radiating device 70 of the outside air temperature detected by the outside air temperature sensor 45 or the outside air temperature and the wind intensity at the installation location. The temperature of the first heat exchanger 15 after the hot water supply operation is stopped is estimated based on the outside air temperature or the outside air temperature and the strength of the wind, and the longer the temperature, the longer the time. In addition, the time set in the timer may be changed.

  For example, in 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 up to 5 minutes. The reason why the wind strength at the installation site is taken into account is that when the wind is strong, the wind flows from the exhaust port and the first heat exchanger 15 is cooled. 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 electric power and current required to drive the combustion fan 11 for a unit time in the hot water supply operation immediately before stopping the hot water supply operation. Judgment can be made.

  In addition, although the water heater 10 illustrated the latent heat recovery type | mold which has the 1st latent heat exchanger 15a, the 1st sensible heat exchanger 15b, the 2nd latent heat exchanger 16a, and the 2nd sensible heat exchanger 16b, The latent heat exchanger may not be provided, and a type having only a sensible heat exchanger may be used.

DESCRIPTION OF SYMBOLS 1 ... Hot-water supply system 2 ... Bathtub 10 ... Hot-water heater 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 ... first latent heat exchanger 15b ... first sensible heat exchanger 16 ... second heat exchanger 16a ... second latent heat exchanger 16b ... second sensible heat exchanger 17 ... cistern 18 ... circulation pump DESCRIPTION OF SYMBOLS 19 ... Bath circulation pump 21 ... Pipe line 22 ... Flow control valve 23 ... Water-water heat exchanger 24 ... Pipe line 25 ... Pipe line 26 ... Pipe line 28 ... Junction part 31 ... High temperature return 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 heat exchanger temperature sensor 45 ... Outside air temperature sensor 46 ... Communication unit 47 ... Bath remote controller 48 ... Main remote controller 49 ... Low temperature temperature sensor 51 ... Water supply pipe 52 ... Hot water supply pipe 53 ... Water quantity sensor 54 ... Water quantity servo 55 ... Bypass Pipe 56 ... Bypass mixing valve 57 ... Connecting pipe 58 ... Pouring solenoid valve 59 ... Check valve 61 ... Water injection pipe 62 ... Solenoid valve 64 ... Gas supply pipe 65 ... Original gas solenoid valve 66 ... Gas proportional valve 67 ... Gas solenoid valve 68 ... Gas solenoid valve 70 ... Radiator 71 ... Radiator 72 ... Thermally operated valve 73 ... Blower fan 75 ... Communication section 76 ... Operation panel 77 ... Room temperature sensor 80 ... Second heat radiator 81 ... Radiator

Claims (6)

A hot water supply system including a water heater and a heat dissipation device using the water heater as a heat source,
The water heater is
A first combustion chamber;
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;
A second combustion chamber;
A second heat exchanger that is housed in the second combustion chamber and through which a pipe of a predetermined circulation path through which a radiator of the heat dissipation device is inserted;
A circulation pump provided in the circulation path;
A second burner for heating the second heat exchanger;
A combustion fan that operates during combustion of at least one of the first burner and the second burner and blows combustion air to both the first combustion chamber and the second combustion chamber;
Hot water supply operation for burning the first burner to supply hot water at a hot water supply set temperature when there is water in the hot water supply pipe, and operating the circulation pump in response to an operation request from the heat radiating device A controller for controlling a circulating fluid heating operation for heating the fluid circulating in the circulation path by the second burner;
A communication unit communicating with the heat dissipation device;
With
The control unit transmits hot water supply operation information indicating an operation state of the hot water supply operation to the heat dissipation device using the communication unit,
The heat dissipating device determines whether or not the water heater is in a predetermined period after stopping 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. The hot water supply system is characterized in that the amount of heat requested by the operation request is restricted to a predetermined amount or less. The hot water supply system according to claim 1, wherein the predetermined period is a period after the hot water supply operation is stopped, before the hot water supply operation is restarted, and before a predetermined time elapses from the stop of the hot water supply operation. . The heat dissipation device, when the operation instruction of its own device continues from before the end of the predetermined period and after the end of the predetermined period, after the end of the predetermined period, performs the operation request including a compensation instruction,
3. The hot water supply according to claim 1, wherein the hot water heater performs the circulating fluid heating operation by increasing the operation speed of the circulation pump than usual when receiving an operation request including the compensation instruction. system. The heat dissipating device determines whether the hot water supply operation stopped by the water heater is based on the hot water supply operation information, and only when the hot water supply operation uses the shower. 4. The transmission of the operation request is prohibited during a predetermined period after the operation is stopped, or the amount of heat requested by the operation request is limited to a predetermined amount or less. Hot water supply system as described in. 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 stop of the hot water supply operation during the predetermined period. The said control part does not perform the post fan based on the stop of the said hot-water supply operation, when the said circulating fluid heating operation is scheduled within the predetermined period after the stop of the said hot-water supply operation. The hot water supply system according to any one of 5.

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