JP2014139496A - Heat source machine and freezing prevention control method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat source machine capable of efficiently preventing freezing of liquid in a device without unnecessarily disturbing a user, and a freezing prevention control method that can be implemented with such a heat source machine.SOLUTION: A heat source machine 1 in which air blown from a blower 5 flows into a combustion system 3 in which a combustion operation is not executed in a situation in which at least one of combustion systems 3 does not execute the combustion operation and in which the other combustion systems 3 execute the combustion operation executes a freezing prevention operation for preventing freezing of liquid in a predetermined device. Furthermore, an operation content of the freezing prevention operation is changed on the basis of combustion operation execution situations of the combustion systems and a value detected by a temperature sensor.

Description

The present invention relates to a heat source device for heating a heat medium such as hot water for the purpose of hot water supply, hot water filling, supply of heat to a heating device, reheating of a bath, etc., and can prevent freezing of liquid flowing inside It relates to a heat source machine.
The present invention also relates to a freeze prevention control method for preventing freezing of a liquid inside a heat source machine.

  2. Description of the Related Art A heat source device including a combustion section that contains a burner and a heat exchanger is widely known. In such a heat source machine, a combustion operation is performed using fuel and combustion air supplied from the outside, and the heat of the combustion gas generated by the combustion operation is recovered by a heat exchanger. Then, by supplying the recovered heat to a heat medium such as hot water or antifreeze, operations such as hot water supply, hot water filling, supply of heat to a heating device, reheating of a bath, and the like are possible.

  Among these types of heat source machines, there is what is called a so-called composite type capable of performing a plurality of operations among these operations such as hot water supply, hot water filling, supply of heat to a heating device, and reheating of a bath.

  Here, some composite heat source machines use different heat exchangers depending on the operation to be performed, such as a so-called two-can two-water type. Such a heat source device includes, for example, a heat exchanger for hot water supply and a heat exchanger for reheating a bath. In other words, it is a combined heat source machine that has a heat exchanger through which hot water supplied from outside during the hot water supply operation passes and a heat exchanger through which hot water from the bathtub passes during the bath reheating operation. is there.

  In addition, a composite heat source machine is provided with a plurality of flow paths in one heat exchanger, such as a so-called single can / two water type, and different flow paths are used depending on the operation to be performed. There is something. As such a heat source device, for example, the interior of the heat exchanger is divided into two spaces by a partition, a flow path for hot water supply is arranged in one space, and a flow for replenishing the bath in the other space. Some roads are arranged. In such a heat source device, hot water flowing through the hot water supply channel is heated when the hot water supply operation is performed, and bath water flowing through the bath reheating channel is heated when the bath reheating operation is performed.

  Here, in a combined heat source apparatus including two heat exchangers, for example, when only bathing is performed, the temperature of only one of the two heat exchangers rises, and only the other heat exchanger May be in a low temperature state. Similarly, in a composite heat source machine in which two flow paths are arranged inside one heat exchanger, the temperature of only a part of the heat exchanger in which one flow path is located rises, and the other part The temperature may be low.

Such a composite heat source machine may be operated in a cold region.
When only one of the two heat exchangers is in a low temperature state, there is a possibility that hot water or the like may freeze in a flow path formed inside the heat exchanger that is at a low temperature. Similarly, when only one of the two flow paths formed in one heat exchanger is in a low temperature state, hot water or the like may freeze inside the flow path.

  As a technique for solving such a problem, there is a bath water heater control method disclosed in Patent Document 1. In the bath water heater control method disclosed in Patent Document 1, when bathing is performed, the hot water filling operation is forcibly performed. That is, when the bathtub water is heated with the reheating heat exchanger, the operation of forcibly heating the hot water with the hot water supply heat exchanger is performed. For this reason, the hot water supply heat exchanger does not become low temperature when the bath is reheated, and the hot water does not freeze inside the hot water supply heat exchanger.

Japanese Patent No. 3600004

  However, in the bath water heater control method disclosed in Patent Document 1, hot water is forcibly supplied in a situation where it is not necessary to supply hot water to the bathtub. Therefore, the water level of the bathtub suddenly rises even though the user has not performed an operation for adding hot water, causing unnecessary confusion to the user.

Then, this invention makes it a subject to provide the heat source machine which can prevent the freezing of the liquid inside an apparatus efficiently, without giving an unnecessary confusion to a user.
It is another object of the present invention to provide a freeze prevention control method that can efficiently prevent freezing of liquid inside an apparatus without causing unnecessary confusion to a user.

  The invention according to claim 1 for solving the above-mentioned problems is a housing, a combustion section capable of performing a combustion operation for burning fuel supplied from the outside by a combustion burner, and a combustion operation of the combustion section A combustion system having at least a heat exchanging part that recovers the heat of the combustion gas generated by the above and a blower for supplying combustion air to the combustion part, and a plurality of the combustion systems are provided, In a situation where a combustion operation is not performed in one combustion system and a combustion operation is performed in another combustion system, air blown from the blower flows into the combustion system where a combustion operation is not performed The heat source device includes a temperature sensor capable of detecting a temperature of a predetermined portion in the casing, and includes a heating target member including at least one of a device and a pipe through which liquid flows. The anti-freezing operation for preventing freezing of the liquid inside the member to be heated is performed, based on the implementation status of the combustion operation in the plurality of combustion systems and the value detected by the temperature sensor The heat source machine is characterized in that the operation content of the freeze prevention operation is changed.

  In the heat source apparatus of the present invention, the operation content of the freeze prevention operation is changed based on the implementation status of the combustion operation in the plurality of combustion systems and the value detected by the temperature sensor. For this reason, appropriate anti-freezing operation is implemented against changes in the implementation status of combustion operations in multiple combustion systems, that is, changes in the temperature of equipment (heating target members) due to the combination of the presence or absence of combustion operations in each combustion system can do.

More specifically, in the heat source machine, the combustion operation is not performed in all the combustion systems, the combustion operation is performed only in the combustion system used for hot water supply, and used for reheating the bath. In each state such as the state where the combustion operation is performed only in the combustion system, the influence of each device and each pipe from the combustion system is different, so that the temperature of the device and the pipe at the same ambient temperature is different from the temperature. turn into. That is, when the implementation status of the combustion operation is different, even if the ambient temperature is the same, the temperature of the equipment and the piping will be different. For this reason, only when the implementation status of the combustion operation is in a specific situation, the liquid freezes in the equipment or piping, even though the liquid does not freeze in the equipment or piping in other situations. Will occur.
Therefore, in the heat source machine of the present invention, the operation content of the freeze prevention operation is changed based on the implementation status of the combustion operation in the plurality of combustion systems and the value detected by the temperature sensor. This makes it possible to perform an appropriate antifreezing operation for each implementation state of the combustion operation. In other words, unlike the case where the freeze prevention operation is simply performed based only on the ambient temperature, even if the state of implementation of the combustion operation changes in various ways, There will be no freezing of the liquid in the pipe.
And, according to the configuration for appropriately switching the operation content of the antifreezing operation in this way, a control configuration that performs the operation for preventing the freezing in the situation where the temperature of the device (or piping) is the lowest, also in other situations, For example, unlike a control configuration in which a heater with a large amount of heat is operated even in a situation where the temperature of the device (or piping) does not decrease so much, the operation of the freeze prevention operation can be performed efficiently. Therefore, there is an advantage that the operation cost related to the freeze prevention operation can be reduced.
Also, unlike a control configuration that prevents freezing by forcibly supplying hot water to the bathtub, no hot water is added to the bathtub even though the user is not operating to add hot water. So there is no unnecessary confusion for the user.

  The invention according to claim 2 includes an anti-freezing heater for heating the member to be heated, and the anti-freezing operation includes an operation of operating the anti-freezing heater for a predetermined time within a predetermined period. In this operation, the length of the predetermined period when the antifreeze heater is operated and / or based on the state of execution of the combustion operation in the plurality of combustion systems and the value detected by the temperature sensor The heat source machine according to claim 1, wherein the length of operation time is changed.

  The invention according to claim 3 includes an anti-freezing heater for heating the heating target member, and the anti-freezing operation compares the temperature detected by the temperature sensor with a reference temperature or temperature range, and compares On the basis of the result of the above, the operation including operating the freeze prevention heater for a predetermined time within a predetermined period, in the operation, the implementation status of the combustion operation in the plurality of combustion systems, the temperature sensor The heat source machine according to claim 1 or 2, wherein the reference temperature or temperature range is changed based on a value detected by.

  According to a fourth aspect of the present invention, in the antifreezing operation, combustion air is supplied to the combustion system performing the combustion operation in a situation where the combustion operation is performed in any one of the combustion systems. Including the operation of reducing the amount of air blown from the blower, and in the operation, from the blower based on the implementation status of the combustion operation in the plurality of combustion systems and the value detected by the temperature sensor The heat source apparatus according to any one of claims 1 to 3, wherein the amount of air blown is reduced.

  It is preferable that the freeze prevention operation performed by the heat source apparatus of the present invention is these operations.

  The invention according to claim 5 includes a circulation circuit in which the heat medium circulates, and the freeze prevention operation includes an operation in which the heat medium is circulated for a predetermined time within a predetermined period in the circulation circuit. In the operation, the length of the predetermined period and / or the circulation time of the heat medium is circulated based on the implementation status of the combustion operation in the plurality of combustion systems and the value detected by the temperature sensor. The heat source machine according to any one of claims 1 to 4, wherein the length is changed.

Such an operation may be sufficient as the freeze prevention operation implemented with the heat-source equipment of this invention.
In addition, unlike the operation of adding hot water to the bathtub, the operation of circulating the heat medium in the circulation circuit is an operation in which it is difficult for the user to visually recognize that the operation is being performed. Therefore, even if the heat medium is circulated in the circulation circuit for the anti-freezing operation, the user hardly notices that the heat medium is circulated, and it can be said that the user is not unnecessarily confused. .

  According to a sixth aspect of the present invention, there is provided a housing, a combustion section capable of performing a combustion operation for burning fuel supplied from the outside by a combustion burner, and a combustion gas generated by the combustion operation of the combustion section. A combustion system having at least a heat exchanging section for recovering heat; a blower for supplying combustion air to the combustion section; and a temperature sensor capable of detecting the temperature of a predetermined portion in the casing, and the combustion A plurality of systems are provided, and a combustion operation is not performed in at least one of the combustion systems, and a combustion operation is performed on air blown from the blower in a situation where a combustion operation is performed in another combustion system. An anti-freezing control method that can be performed by a heat source machine that flows into the combustion system that is not implemented, and includes a heating target member including at least one of a device and a pipe through which liquid flows. The anti-freezing operation for preventing freezing of the liquid inside the member to be heated is performed, based on the implementation status of the combustion operation in the plurality of combustion systems and the value detected by the temperature sensor The anti-freezing control method is characterized in that the operation content of the anti-freezing operation is changed.

  According to a seventh aspect of the present invention, in the freeze prevention operation, the freeze prevention heater attached to the member to be heated is operated for a predetermined time within a predetermined period, and the combustion operation status in the plurality of combustion systems is performed. Based on the value detected by the temperature sensor, an operation for changing the length of the predetermined period and / or the length of the operation time when the antifreeze heater is operated, and the temperature detected by the temperature sensor A reference temperature or temperature range is compared, and based on the comparison result, the antifreezing heater attached to the member to be heated is operated for a predetermined time within a predetermined period, and combustion in a plurality of the combustion systems is performed. Based on the operation implementation status and the value detected by the temperature sensor, the operation for changing the reference temperature or temperature range, and the combustion operation is performed in any one of the combustion systems The amount of air blown from the blower that is supplying combustion air to the combustion system that is performing the combustion operation, the implementation status of the combustion operation in the plurality of combustion systems, and the temperature The freeze prevention control method according to claim 6, comprising at least one operation among operations for reducing the amount of air blown from the blower based on a value detected by a sensor.

  Similarly, in the freeze prevention control method of the present invention, an appropriate freeze prevention operation can be performed with respect to changes in the implementation status of combustion operations in a plurality of combustion systems. For this reason, the liquid does not freeze in the device or the pipe only under certain circumstances. In addition, since the operation of the freeze prevention operation can be performed efficiently, the operation cost related to the freeze prevention operation can be reduced. In addition, although the user is not operating to add hot water, hot water is not added to the bathtub, and the user is not unnecessarily confused.

The heat source machine of the present invention changes the operation content of the antifreezing operation based on the implementation status of the combustion operation in the plurality of combustion systems and the value detected by the temperature sensor. For this reason, it is possible to perform an appropriate anti-freezing operation with respect to changes in the implementation status of the combustion operation in the plurality of combustion systems. As a result, it is possible to efficiently prevent the liquid from freezing in the apparatus and the pipe without causing unnecessary confusion to the user.
Similarly, in the freeze prevention control method of the present invention, an appropriate freeze prevention operation can be performed with respect to changes in the implementation status of the combustion operation in the plurality of combustion systems.

It is an operation principle figure showing a heat source machine concerning an embodiment of the present invention. It is an operation principle figure which shows the heat source machine of embodiment different from FIG. 1, and abbreviate | omits and shows except a main part.

  Hereinafter, although the heat source apparatus 1 concerning embodiment of this invention is demonstrated in detail, this invention is not limited to these examples.

  As shown in FIG. 1, the heat source apparatus 1 according to the present embodiment includes two independent combustion systems 3 inside the housing 2, and these two combustion systems 3 are respectively composed of cans of different systems and It is formed from a piping system. That is, the heat source unit 1 employs a structure called a so-called two-can two-water type. In addition, the comparatively large combustion system 3a located on the right side is a combustion system 3 mainly used for a heating operation in general hot water supply. The other combustion system 3b located on the left side is a combustion system 3 that is mainly used for reheating baths and supplying heat to heat loads such as heating equipment.

  Each combustion system 3 includes a combustion unit 4, a blower 5 that supplies air to the combustion unit 4, a primary heat exchanger 6 (heat exchange unit, member to be heated) that mainly recovers sensible heat, and mainly latent heat. It is formed by the secondary heat exchanger 7 (heat exchange part) which collect | recovers. That is, the heat source apparatus 1 of the present embodiment has a function of recovering latent heat, and is also referred to as a so-called latent heat recovery type.

  The combustion unit 4 is configured to generate high-temperature combustion gas by burning fuel such as gas supplied from the outside by a burner.

  The blower 5 incorporates a motor and an impeller (not shown) inside, and can change the rotation speed according to the combustion state of the burner in the combustion unit 4 to adjust the blowing amount and the blowing pressure. That is, the rotational speed (rotational speed) per unit time of the impeller can be varied, and the amount of air blown out is increased or decreased in proportion to the rotational speed.

  The primary heat exchanger 6 is a known gas / liquid heat exchanger, and is disposed downstream of the combustion unit 4 in the flow direction of the combustion gas. The primary heat exchanger 6 is a fin-and-tube heat exchanger whose main part is made of copper and in which hot water flows.

  The secondary heat exchanger 7 is a known gas / liquid heat exchanger, and is a part that recovers the thermal energy of the combustion gas that could not be recovered by the primary heat exchanger 6, and is combusted by the primary heat exchanger 6. It is arranged downstream in the gas flow direction. This secondary heat exchanger 7 is formed by incorporating a pipe (not shown) through which hot water flows inside the box-like body, and adopts stainless steel or the like having high corrosion resistance as a raw material of this pipe. Thus, the structure is superior in corrosion resistance compared to the primary heat exchanger 6.

  Further, the heat source device 1 of the present embodiment includes a control device 9, which can receive signals from various sensors in the heat source device 1. The control device 9 transmits an operation command to each part of the heat source device 1, so that the heat source device 1 can perform various operations.

The control device 9 includes a CPU as a calculation unit and a memory as a storage unit, and a program necessary for controlling the heat source device 1 is stored in the memory.
And the control apparatus 9 can memorize | store the information which the calculating means calculated based on the information detected by each sensor etc. and the information which each sensor etc. detected.

  Furthermore, the supply air temperature sensor 12 (temperature sensor) and the ambient temperature sensor 13 (temperature sensor) are attached to the inside of the housing 2 in the heat source device 1 of the present embodiment.

  The supply air temperature sensor 12 is a known thermistor, and is attached in the vicinity of an air supply port (not shown) for allowing external air to flow into the housing 2 (detailed position in FIG. 1). The relationship is not shown). That is, the supply air temperature sensor 12 is attached to the inside of the housing 2 in a state in which the temperature of air flowing from an intake port (not shown) can be detected.

  The ambient temperature sensor 13 is a known thermistor, and is attached at a position away from an air supply port (not shown) for allowing external air to flow into the housing 2 (specific positional relationship). (Not shown). That is, the ambient temperature sensor 13 is attached in a state where the ambient temperature Ta in the housing 2 can be detected.

  Here, the primary heat exchanger 6 belonging to the relatively large combustion system 3a located on the right side, that is, the primary heat exchanger 6 mainly used for general hot water supply, has a hot water supply side antifreeze heater 16 (freezing preventive). A heater is installed. The primary heat exchanger 6 belonging to the other combustion system 3b, that is, the primary heat exchanger 6 mainly used for reheating a bath or the like has a circulation-side antifreeze heater 17 (freeze heater). It is attached.

  The hot water supply side antifreeze heater 16 is a known heater such as a ceramic heater or a quartz glass tube heater, and is attached in a state where the primary heat exchanger 6 can be heated. That is, the hot water supply side freeze prevention heater 16 is a heater for heating the primary heat exchanger 6 in order to prevent freezing of the hot water remaining in the primary heat exchanger 6.

  The circulation side antifreeze heater 17 is also a known heater such as a ceramic heater or a quartz glass tube heater. And it attaches in the state which can heat the primary heat exchanger 6 which belongs to the combustion system | strain 3b different from the primary heat exchanger 6 to which the hot water supply side antifreezing heater 16 was attached. That is, the circulation side antifreeze heater 17 is also a heater for heating the primary heat exchanger 6 in order to prevent freezing of hot water remaining in the primary heat exchanger 6.

  In the heat source apparatus 1 of the present embodiment, an exhaust collecting pipe 29 into which the combustion gas discharged from each combustion system 3 is introduced is provided at a portion located downstream of the two combustion systems 3 in the exhaust flow direction. ing. The exhaust collecting pipe 29 forms an exhaust passage integrated with each combustion system 3 continuously. Therefore, the combustion gas discharged from each combustion system 3 joins in the exhaust collecting pipe 29 and is discharged from the exhaust pipe 30 connected to the exhaust collecting pipe 29.

  That is, in the heat source apparatus 1 of the present embodiment, in each combustion system 3, a space that communicates from the inside of the combustion unit 4 to the inside of the exhaust collecting pipe 29 through each of the primary heat exchanger 6 and the secondary heat exchanger 7. Is formed. Further, a space that communicates from the inside of the exhaust collecting pipe 29 to the inside of the exhaust cylinder 30 is formed. For this reason, in the heat source unit 1, the combustion unit 4 reaches the exhaust pipe 30 through the inside of the exhaust collecting pipe 29, and a space that continues to the outside is formed. And the combustion gas which generate | occur | produced in the combustion part 4 can flow through this space.

  And in the heat source machine 1 of this embodiment, each combustion system | strain 3 can implement combustion operation | movement independently. This combustion operation will be described in detail below.

When the combustion operation is started in any one of the combustion systems 3, the blower 5 is operated and external air is introduced into the housing 2. Then, the introduced air is supplied to the combustion unit 4 as combustion air. Moreover, in the combustion part 4, fuel, such as gas, is burned and combustion gas is generated. The combustion gas reaches the exhaust collecting pipe 29 through the inside of the primary heat exchanger 6 and the secondary heat exchanger 7, passes through the inside of the exhaust pipe 30, and is discharged to the outside.
On the other hand, a heat medium such as hot water or antifreeze flows into the secondary heat exchanger 7 and the primary heat exchanger 6. These heat media are heated when passing through the inside of the secondary heat exchanger 7 and the primary heat exchanger 6 and are discharged to the outside. The heat medium flowing out to the outside is used for various operations such as a general hot water supply operation (details will be described later).

  Here, the blower 5 belonging to the combustion system 3 on the other side, whether the combustion operation is performed only on the right combustion system 3a or the combustion operation is performed only on the left combustion system 3b. Is running. For example, even if the combustion operation is performed only in the right combustion system 3a and the combustion operation is not performed in the left combustion system 3b, the blower 5 belonging to the left combustion system 3b is operated.

  That is, if the blower 5 belonging to the left combustion system 3b is not operated under such circumstances, the combustion gas flowing into the exhaust collecting pipe 29 does not flow to the exhaust tube 30 side, but flows into the left combustion system 3b. There is a fear. More specifically, the combustion gas discharged from the right combustion system 3a flows into the secondary heat exchanger 7 and the primary heat exchanger 6 belonging to the left combustion system 3b through the exhaust collecting pipe 29. There is a possibility.

  Therefore, not only the blower 5 belonging to the combustion system 3 that performs the combustion operation but also the blower 5 belonging to the combustion system 3 that does not perform the combustion operation in order to prevent the inflow of the combustion gas to the combustion system 3 on the other side. Is also operating. Thereby, not only in the combustion system 3 that performs the combustion operation, but also in the combustion system 3 that does not perform the combustion operation, a flow of gas (air) from the combustion unit 4 side to the exhaust pipe 30 is formed. . Therefore, inflow of combustion gas from the combustion system 3 that performs the combustion operation to the combustion system 3 that does not perform the combustion operation can be prevented.

  The heat source unit 1 of the present embodiment can perform a general hot water supply operation, a dropping operation, a heating operation, and a reheating operation by performing the combustion operation as described above. Various operations that can be performed by the heat source apparatus 1 of the present embodiment will be described in detail.

[General hot water supply operation]
When a hot-water tap 34 such as a currant or shower is operated and hot water supplied from a water supply source (not shown) flows into the water intake pipe 35 and a request for hot water discharge is confirmed, a general hot water supply operation is started. At this time, a part of the hot water flowing through the inlet pipe 35 flows toward the heat exchanger (secondary heat exchanger 7 and primary heat exchanger 6) belonging to the combustion system 3a on the right side, and the other part is heated. It flows into a bypass pipe 36 that extends around the exchanger. The hot water flowing toward the heat exchanger passes through the heat exchanger and is heated and discharged to the hot water outlet pipe 37. Further, in the hot water outlet pipe 37, the hot water passing through the heat exchanger and the hot water passing through the bypass pipe 36 are mixed. The mixed hot water is discharged to the general hot water supply pipe 38 and supplied from the general hot water supply pipe 38 to the hot water tap 34.

[Drop operation]
When a drop operation is requested by a remote controller (not shown), the hot water electromagnetic valve 44 is opened in the bath drop pipe 43 connected to the downstream side of the hot water pipe 37. That is, the state where hot water does not flow from the hot water discharge pipe 37 side to the bath dropping pipe 43 side is shifted to a state where hot water flows from the hot water discharge pipe 37 side to the bath dropping pipe 43 side. Then, hot water supplied from a water supply source (not shown) flows through the inlet pipe 35, is heated through the heat exchanger belonging to the right combustion system 3 a, and is discharged to the hot water outlet pipe 37. As in the general hot water supply operation described above, the hot water passing through the heat exchanger and the hot water passing through the bypass pipe 36 are mixed in the hot water outlet pipe 37. Then, the hot water that has flowed into the bath dropping pipe 43 from the hot water dropping pipe 37 passes through the bath dropping pipe 43 and is then supplied to the bathtub 45 through a pipe located on the downstream side of the bath dropping pipe 43.

[Heating operation]
When the operation switch is turned on by an external heating device (not shown) or the like and the heating operation is requested, the heating circulation pump 49 is driven. Thus, a heating circulation path 50 (which extends through the heat exchanger (secondary heat exchanger 7 and primary heat exchanger 6) belonging to the left combustion system 3b and an external heating device (not shown). The antifreeze will circulate inside the circulation circuit. Here, the antifreeze is heated to increase the temperature when passing through the heat exchanger, and the temperature is decreased by supplying heat to the heating device. That is, in the heating operation, the antifreeze liquid heated by passing through the inside of the heat exchanger flows toward the heating device and supplies heat to the heating device. Furthermore, the antifreeze liquid which became low temperature by supplying heat to the heating equipment flows toward the heat exchanger. And the operation | movement that the antifreeze liquid heated again by passing a heating appliance flows toward a heating appliance will be repeated.

[Fast driving]
When a chasing operation is requested by a remote controller (not shown), the chasing circulation pump 54 is driven. As a result, the hot water stored in the bathtub 45 circulates in the inside of the recirculation circulation path 56 formed between the bathtub 45 and the heat exchanger 55 for bath.
On the other hand, when the heating circulation pump 49 is driven, antifreeze liquid is generated between the heat exchanger (secondary heat exchanger 7 and primary heat exchanger 6) belonging to the left combustion system 3b and the heat exchanger 55 for bath. Circulate. That is, the antifreeze liquid circulates between the heat exchanger and the bath heat exchanger 55 through a part of the heating circulation path 50.
Here, the antifreeze liquid circulating between the heat exchanger belonging to the left combustion system 3 b and the bath heat exchanger 55 flows through the primary flow path of the bath heat exchanger 55. Further, the hot water flowing through the memorial circulation path 56 flows through the secondary flow path of the bath heat exchanger 55. As a result, heat exchange is performed between the heated antifreeze and the hot water flowing from the bathtub 45, and the temperature of the hot water is increased. And the hot water heated up is returned to the bathtub 45, and the temperature of the hot water stored in the bathtub 45 rises.

That is, in the heat source device 1 of the present embodiment, when performing the general hot water supply operation or the dropping operation, the combustion operation is performed in the right combustion system 3a to heat the hot water supplied from the outside.
On the other hand, when the heating operation or the reheating operation is performed, a combustion operation is performed in the left combustion system 3b to heat the antifreeze flowing inside the recirculation circulation path 56.

By the way, when operating the heat source unit 1 in a low temperature area such as a cold region, there is a possibility that hot water or the like may freeze inside the heat exchanger (the secondary heat exchanger 7 and the primary heat exchanger 6).
Therefore, in the heat source apparatus 1 of the present embodiment, the hot water supply side anti-freezing heater 16 and the circulation side anti-freezing heater 17 are appropriately operated to prevent freezing of the liquid in the heat exchanger, and the anti-freezing operation is performed. We are carrying out. The freeze prevention operation, which is a characteristic operation of the present embodiment, will be described in detail below.

  Here, in the heat source device 1 of the present embodiment, as described above, not only the blower 5 belonging to the combustion system 3 that performs the combustion operation but also the blower 5 that belongs to the combustion system 3 that does not perform the combustion operation. . However, when the blower 5 is operated in the combustion system 3 that does not perform the combustion operation in a cold region or the like, low-temperature air flows into the combustion system 3, and the heat exchanger (2) belonging to the combustion system 3 The temperature of the secondary heat exchanger 7 and the primary heat exchanger 6) will be very low.

  Therefore, in the first freeze prevention operation of the present embodiment, when both of the two combustion systems 3 are not performing the combustion operation, the first heating operation is performed in which the heating operation is performed over a relatively short time. ing. In addition, when only one of the two combustion systems 3 is performing the combustion operation, over a relatively long time with respect to equipment (heat exchanger) belonging to the combustion system 3 that is not performing the combustion operation. A second heating operation for performing the heating operation is performed. That is, in the first freeze prevention operation of the present embodiment, when it is predicted that the equipment (heat exchanger) belonging to the combustion system 3 will be at a low temperature, the heating operation is performed for a relatively long time.

  The first anti-freezing operation will be described in detail with reference to Table 1 by taking as an example an operation performed on the primary heat exchanger 6 belonging to the right combustion system 3a.

  The first freeze prevention operation of the present embodiment is started on condition that the ambient temperature Ta inside the housing 2 is equal to or lower than a predetermined temperature (3 degrees Celsius). Then, the control cycle of the hot water supply side anti-freezing heater 16 is changed based on the ambient temperature Ta detected by the ambient temperature sensor 13 and the implementation status of the combustion operation in the combustion system 3.

  First, the case where both of the two combustion systems 3 are not performing the combustion operation, that is, the case where the first heating operation is performed will be described.

First, when the ambient temperature Ta is greater than 0 degrees Celsius and less than 3 degrees Celsius and both combustion systems 3 are not performing a combustion operation, the hot water supply side anti-freezing heater 16 is operated for 5 minutes and then 20 minutes. A heating operation is carried out such as resting and operating again for 5 minutes.
That is, one cycle is set to 25 minutes, the predetermined time Tx is set to 5 minutes, and the heating operation is performed by the hot water supply side anti-freezing heater 16 for the predetermined time Tx during one cycle. Then, this control is continuously performed until the ambient temperature Ta is not in the range of greater than 0 degrees Celsius and less than 3 degrees Celsius.

Similarly, when the ambient temperature Ta is greater than −3 degrees Celsius and equal to or less than 0 degrees Celsius, and both of the two combustion systems 3 are not performing the combustion operation, the hot water supply side antifreeze heater 16 is operated for 10 minutes. A heating operation is performed in which the operation is paused for 10 minutes and then operated again for 10 minutes.
In this case, one cycle is set to 20 minutes, the predetermined time Tx is set to 10 minutes, and the heating operation is performed by the hot water supply side anti-freezing heater 16 for the predetermined time Tx during one cycle. Then, this control is continued until the ambient temperature Ta is not in the range of greater than -3 degrees Celsius and less than 0 degrees Celsius.

Furthermore, when the ambient temperature Ta is greater than −6 degrees Celsius and −3 degrees Celsius or less, and both combustion systems 3 are not performing the combustion operation, the hot water supply side antifreeze heater 16 is operated for 20 minutes. A heating operation is performed in which the operation is stopped for 5 minutes and then operated again for 20 minutes.
In this case, one cycle is set to 25 minutes, the predetermined time Tx is set to 20 minutes, and the heating operation is performed by the hot water supply side anti-freezing heater 16 for the predetermined time Tx during one cycle. Then, this control is continuously performed until the ambient temperature Ta is greater than −6 degrees Celsius and no longer within the range of −3 degrees Celsius.

When the ambient temperature Ta is -6 degrees Celsius or less and both the two combustion systems 3 are not performing the combustion operation, a heating operation is performed such that the hot water supply side anti-freezing heater 16 is operated for 25 minutes.
In this case, one cycle is set to 25 minutes, the predetermined time Tx is set to 25 minutes, and the heating operation is performed by the hot water supply side anti-freezing heater 16 for the predetermined time Tx during one cycle. Therefore, after operating the hot water supply side antifreeze heater 16 for 25 minutes, when the ambient temperature Ta is -6 degrees Celsius or less, the hot water supply side antifreeze heater 16 is operated again for 25 minutes. That is, the hot water supply side antifreeze heater 16 continues to operate until the ambient temperature Ta becomes higher than -6 degrees Celsius.

  Subsequently, a case where the combustion operation is performed in the left combustion system 3b and the combustion operation is not performed in the right combustion system 3a, that is, a case where the second heating operation is performed will be described.

First, when the ambient temperature Ta is greater than 0 degrees Celsius and equal to or less than 3 degrees Celsius, and only the left combustion system 3b of the two combustion systems 3 is performing the combustion operation, the hot water supply side antifreeze heater 16 is set to 8 A heating operation is performed in which the operation is performed for 15 minutes, then paused for 15 minutes, and again for 8 minutes.
In other words, one cycle is set to 23 minutes, the predetermined time Tx is set to 8 minutes, and the heating operation is performed by the hot water supply side anti-freezing heater 16 for the predetermined time Tx during one cycle. Then, this control is continuously performed until the ambient temperature Ta is not in the range of greater than 0 degrees Celsius and less than 3 degrees Celsius.

Similarly, when the ambient temperature Ta is greater than −3 degrees Celsius and less than or equal to 0 degrees Celsius, and only the left combustion system 3b of the two combustion systems 3 is performing the combustion operation, the hot water supply side antifreeze heater 16 Is operated for 15 minutes, then paused for 10 minutes, and then heated again for 15 minutes.
In this case, one cycle is set to 25 minutes, the predetermined time Tx is set to 15 minutes, and the heating operation is performed by the hot water supply side anti-freezing heater 16 for the predetermined time Tx during one cycle. Then, this control is continued until the ambient temperature Ta is not in the range of greater than -3 degrees Celsius and less than 0 degrees Celsius.

Furthermore, when the ambient temperature Ta is greater than −6 degrees Celsius and less than −3 degrees Celsius and only the left combustion system 3b of the two combustion systems 3 is performing the combustion operation, the hot water supply side antifreeze heater 16 Is operated for 25 minutes, then paused for 3 minutes, and again is operated for 25 minutes.
In this case, one cycle is set to 28 minutes, the predetermined time Tx is set to 25 minutes, and the heating operation is performed by the hot water supply side anti-freezing heater 16 for the predetermined time Tx during one cycle. Then, this control is continuously performed until the ambient temperature Ta is greater than −6 degrees Celsius and no longer within the range of −3 degrees Celsius.

When the ambient temperature Ta is -6 degrees Celsius or less and only the left combustion system 3b of the two combustion systems 3 is performing the combustion operation, the hot water supply side antifreeze heater 16 is operated for 30 minutes. Perform the heating operation.
In this case, one cycle is set to 30 minutes, the predetermined time Tx is set to 30 minutes, and the heating operation is performed by the hot water supply side anti-freezing heater 16 for the predetermined time Tx during one cycle. Therefore, after operating the hot water supply side antifreeze heater 16 for 30 minutes, when the ambient temperature Ta is -6 degrees Celsius or less, the hot water supply side antifreeze heater 16 is operated again for 30 minutes. That is, the hot water supply side antifreeze heater 16 continues to operate until the ambient temperature Ta becomes higher than -6 degrees Celsius.

  As described above, in both the first heating operation and the second heating operation, the control cycle of the hot water supply side anti-freezing heater 16 is changed based on the temperature range to which the ambient temperature Ta detected by the ambient temperature sensor 13 belongs. . Then, as the temperature range to which the atmospheric temperature Ta belongs becomes a low temperature range, the ratio of the time for performing the heating operation in one cycle, that is, the ratio of the operating time of the hot water supply side anti-freezing heater 16 in one cycle increases. To go.

  Further, when comparing the first heating operation and the second heating operation, when the temperature range to which the atmospheric temperature Ta belongs is the same, the second heating operation is compared with the first heating operation in the operating time of the hot water supply side anti-freezing heater 16. Is getting longer. That is, in the second heating operation, the ratio of the time for performing the heating operation in one cycle is longer than that in the first heating operation.

  That is, in the first freeze prevention operation of the present embodiment, it can be said that the lower the ambient temperature Ta, the longer the operating time of the hot water supply side freeze prevention heater 16 and the duration of the heating operation in one cycle. In addition, when only one of the two combustion systems 3 is performing the combustion operation, compared to the case where both of the two combustion systems 3 are not performing the combustion operation, the hot water supply side antifreeze heater The ratio of the operation time of 16 and the implementation time of the heating operation in 1 period becomes long.

By changing the control cycle of the hot water supply side antifreeze heater 16 in this way, it is more appropriate for the temperature change of the device (the primary heat exchanger 6 belonging to the combustion system 3 on the right side) that is the target of the first antifreeze operation. It is possible to prevent freezing.
For this reason, it is configured to perform an operation to prevent freezing using a heater with a high calorific value regardless of the temperature change of the equipment or an operation to prevent freezing by continuing to operate the heater regardless of the temperature change of the equipment. In comparison, it is possible to reduce the cost for operation for preventing freezing. Further, in the situation where only one of the two combustion systems 3 is performing the combustion operation, the combustion operation is not forcibly performed in the other combustion system 3. That is, unnecessary operations are not performed to prevent freezing.

In the above-described embodiment, as the second heating operation, the operation for increasing the operating time of the hot water supply side anti-freezing heater 16 and the ratio of the execution time of the heating operation in one cycle is performed, but the present invention is not limited to this.
For example, the second heating operation may be an operation in which the hot water supply side anti-freezing heater 16 is operated based on a different standard from the first heating operation. The second antifreezing operation will be described in detail with reference to Table 2.

In the second anti-freezing operation, both of the two combustion systems 3 are not performing the combustion operation (under the condition where the first heating operation is performed), and the ambient temperature Ta is greater than 0 degrees Celsius and 3 degrees Celsius. When the temperature is less than or equal to the degree, a heating operation is performed in which the hot water supply side antifreeze heater 16 is operated for 5 minutes, then is paused for 20 minutes, and is operated again for 5 minutes.
On the other hand, in the situation where only the left combustion system 3b of the two combustion systems 3 is performing the combustion operation (under the condition where the second heating operation is performed), the ambient temperature Ta is 2 degrees Celsius. When the temperature is greater than or equal to 5 degrees Celsius, the heating operation is performed in which the hot water supply side anti-freezing heater 16 is operated for 5 minutes, paused for 20 minutes, and then operated again for 5 minutes.

  In these cases, one cycle is set to 25 minutes, the predetermined time Tx is set to 5 minutes, and the heating operation is performed by the hot water supply side anti-freezing heater 16 for the predetermined time Tx during one cycle. A temperature range in which the ambient temperature Ta is a condition (the ambient temperature Ta is greater than 0 degrees Celsius and less than 3 degrees Celsius in the first heating operation, and the ambient temperature Ta is greater than 2 degrees Celsius and less than 5 degrees Celsius in the second heating operation) Continue this control until no longer.

Thus, in the second freeze prevention operation, the condition for the hot water supply side freeze prevention heater 16 to perform the heating operation at the predetermined control period in the first heating operation, and the hot water supply side freeze prevention heater 16 in the second heating operation. The conditions for carrying out similar operations are different. That is, when the atmospheric temperature Ta belongs to a predetermined temperature range, the hot water supply side anti-freezing heater 16 performs a heating operation at a predetermined control cycle, but the predetermined temperature range (2 degrees Celsius) in the second heating operation. Greater than 5 degrees Celsius and 5 degrees Celsius or less) is a temperature range higher than a predetermined temperature range (greater than 0 degrees Celsius and 3 degrees Celsius or less) in the first heating operation. More specifically, the upper limit of the predetermined temperature range in the second heating operation is higher than the upper limit of the predetermined temperature range in the first heating operation. And the lower limit side of the predetermined temperature range in the second heating operation and the upper limit side of the predetermined temperature range in the first heating operation are partially overlapped.
Therefore, in the second heating operation, the hot water supply side anti-freezing heater 16 performs the heating operation at a predetermined control cycle even when the ambient temperature Ta is relatively high compared to the first heating operation. It becomes.

  That is, in the situation where the second heating operation is performed, even if the atmospheric temperature Ta is relatively high, the equipment (primary heat exchange belonging to the combustion system 3 on the right side) that is the target of the second anti-freezing operation. The temperature of the vessel 6) is likely to have dropped. Therefore, in the second heating operation, even when the ambient temperature Ta is higher than that in the first heating operation, the hot water supply side anti-freezing heater 16 is operated at a predetermined control cycle to perform the heating operation. Thereby, it is possible to reliably prevent freezing of the liquid inside the device to be subjected to the second antifreezing operation.

Similarly, in the first heating operation, when the ambient temperature Ta is greater than −3 degrees Celsius and equal to or less than 0 degrees Celsius, and in the second heating operation, when the ambient temperature Ta is greater than 0 degrees Celsius and equal to or less than 2 degrees Celsius, A heating operation is performed in which the side antifreeze heater 16 is operated for 10 minutes, paused for 10 minutes, and then restarted for 10 minutes.
That is, one cycle is set to 20 minutes, the predetermined time Tx is set to 10 minutes, and the heating operation is performed by the hot water supply side anti-freezing heater 16 for the predetermined time Tx during one cycle. Then, this control is continuously performed until the atmospheric temperature Ta is not in the temperature range as a condition.

Further, in the first heating operation, when the ambient temperature Ta is greater than −6 degrees Celsius and −3 degrees Celsius or less, and in the second heating operation, when the ambient temperature Ta is greater than −3 degrees Celsius and less than 0 degrees Celsius, A heating operation is performed in which the side antifreeze heater 16 is operated for 20 minutes, then paused for 5 minutes, and again operated for 20 minutes.
That is, one cycle is set to 25 minutes, the predetermined time Tx is set to 20 minutes, and the heating operation is performed by the hot water supply side anti-freezing heater 16 for the predetermined time Tx during one cycle. Then, this control is continuously performed until the atmospheric temperature Ta is not in the temperature range as a condition.

When the ambient temperature Ta is −6 degrees Celsius or lower in the first heating operation, and when the ambient temperature Ta is −3 degrees Celsius or lower in the second heating operation, the hot water supply side antifreeze heater 16 is operated for 25 minutes. The heating operation is performed.
In this case, one cycle is set to 25 minutes, the predetermined time Tx is set to 25 minutes, and the heating operation is performed by the hot water supply side anti-freezing heater 16 for the predetermined time Tx during one cycle. Therefore, after operating the hot water supply side antifreeze heater 16 for 25 minutes, if the ambient temperature Ta still belongs to a temperature range that is a condition, the hot water supply side antifreeze heater 16 is operated again for 25 minutes. That is, the hot water supply side antifreeze heater 16 continues to operate until the ambient temperature Ta becomes higher than −6 degrees Celsius or the ambient temperature Ta becomes higher than −3 degrees Celsius.

In the first anti-freezing operation and the second anti-freezing operation described above, the operation performed on the primary heat exchanger 6 belonging to the right combustion system 3a has been described as an example. However, the primary heat belonging to the left combustion system 3b is described. You may perform a 1st freeze prevention operation and a 2nd freeze prevention operation with respect to the exchanger 6. FIG. That is, the circulation side antifreeze heater 17 may be controlled like the hot water supply side antifreeze heater 16 described above. In this case, when the combustion operation is not performed in both of the two combustion systems 3, the first heating operation using the circulation side antifreeze heater 17 is performed. Further, when only the right combustion system 3a is performing the combustion operation, the second heating operation using the circulation side antifreeze heater 17 is performed.
In addition, as in the first anti-freezing operation and the second anti-freezing operation described above, in the second heating operation, the operation time of the circulation side anti-freezing heater 17 and the heating operation in one cycle are compared with those in the first heating operation. You may lengthen the ratio of implementation time. Further, in the second heating operation, a temperature range that is a condition for the circulation side antifreeze heater 17 to operate in a predetermined control cycle may be a higher temperature range than the first heating operation.

Furthermore, when changing the control cycle of the hot water supply side antifreeze heater 16 and the control cycle of the circulation side antifreeze heater 17 based on the ambient temperature Ta, the combustion operation is not performed in both the two combustion systems 3. In each of the case where only the right combustion system 3a is performing the combustion operation and the case where only the left combustion system 3b is performing the combustion operation, the control cycle and / or the circulation side of the hot water supply side anti-freezing heater 16 are respectively used. The control cycle of the freeze prevention heater 17 may be a different control cycle.
Further, the temperature range that is a condition for operating the hot water supply side antifreeze heater 16 and / or the circulation side antifreeze heater 17 in a predetermined control cycle is when the combustion operation is not performed in both of the two combustion systems 3. In the case where only the right combustion system 3a is performing the combustion operation, the temperature range may be different in each case where only the left combustion system 3b is performing the combustion operation.

  By the way, the freeze prevention operation of the present embodiment is not limited to the first freeze prevention operation and the second freeze prevention operation described above. The following third antifreeze operation may be performed.

In the third anti-freezing operation, the combustion operation is performed when the supply air temperature Tb detected by the supply air temperature sensor 12 is equal to or lower than a predetermined temperature and only one of the two combustion systems 3 is performing the combustion operation. This is an operation in which the combustion amount is reduced by the combustion system 3 being operated.
That is, when the amount of combustion is reduced, the amount of air necessary for the combustion operation is reduced, so that the amount of air blown from the blower 5 can be reduced. When the amount of air blown from the blower 5 is reduced, when the air flows into the combustion system 3 that does not perform the combustion operation, the temperature of the equipment belonging to the combustion system 3 is reduced as compared with the case where the amount of air is large. Can be difficult.

In the third antifreezing operation, the combustion amount may be reduced according to the supply air temperature Tb. That is, a configuration in which the amount of combustion (the amount of air blown from the blower 5) is reduced as the supply air temperature Tb becomes lower may be employed.
In the third anti-freezing operation, the combustion amount (the amount of air blown from the blower 5) may be changed based on the temperature range to which the air supply temperature Tb detected by the air supply temperature sensor 12 belongs. In this case, as the temperature range to which the supply air temperature Tb belongs becomes a low temperature range, the combustion amount (the blown amount of the blower 5) is reduced.

  Furthermore, the freeze prevention operation of the present embodiment is not limited to the first to third freeze prevention operations described above. The following fourth freeze prevention operation may be performed.

  In the fourth anti-freezing operation, the heating circulation pump 49 is driven inside the heating circulation path 50 in a situation where only the right combustion system 3a of the two combustion systems 3 performs the combustion operation. This is an operation that circulates antifreeze.

In the fourth antifreezing operation, control may be performed to circulate the antifreeze liquid for a predetermined time during a predetermined cycle.
At this time, the control cycle may be changed based on the temperature range to which the ambient temperature Ta detected by the ambient temperature sensor 13 belongs as in the first antifreezing operation described above. That is, the configuration may be such that the proportion of the time for performing the circulation operation in one cycle increases as the temperature range to which the ambient temperature Ta belongs becomes a low temperature range.
Similarly, the control cycle may be changed based on the temperature to which the ambient temperature Ta detected by the ambient temperature sensor 13 belongs. In other words, the configuration may be such that the ratio of the implementation time of the circulation operation in one cycle increases as the temperature to which the atmospheric temperature Ta belongs becomes lower.

  By the way, the heat source apparatus 1 of the present embodiment performs a reheating operation by circulating hot water stored in the bathtub 45 inside the recirculation circulation path 56 while circulating the antifreeze liquid in the heating recirculation path 50. doing. Here, in the heat source machine (not shown) which is not such a heat source machine 1 but is not provided with the heating circulation path 50 and the circulation path for the remedy extends via the heat exchanger, Such fourth anti-freezing operation may be performed. In this case, the fourth anti-freezing operation is an operation in which the hot water stored in the bathtub is circulated through the circulation path for hot water in a situation where the hot water is stored in the bathtub. In other words, in a heat source machine (not shown) in which the circulation path for the remedy extends via the heat exchanger, the fourth anti-freezing operation for circulating hot water stored in the bathtub through the circulation path for the remedy is performed. You may implement.

In the freeze prevention operation of the present embodiment, it is possible to acquire temperature information such as the atmosphere temperature Ta and the supply air temperature Tb detected by the supply air temperature sensor 12 and the atmospheric temperature sensor 13. Also, a state in which the combustion operation is performed in both of the two combustion systems 3, a state in which only the right combustion system 3a is performing a combustion operation, and a state in which only the left combustion system 3b is performing a combustion operation Among these, it is possible to determine which state is present and obtain it as the implementation status information of the combustion operation. And based on these temperature information and implementation status information, the content of freeze prevention operation can be changed suitably.
That is, in the freeze prevention operation of the present embodiment, one or more of the first freeze prevention operation to the fourth freeze prevention operation may be performed based on the temperature information and the implementation status information. Furthermore, you may change the driving | running to implement or the combination of the driving | running to implement based on temperature information and implementation status information. Further, when performing the first anti-freezing operation and the second anti-freezing operation, the first heating operation and the second heating operation may be switched based on the temperature information and the execution status information.

In the above-described embodiment, the heat source device 1 having a structure called a so-called two-can two-water type has been described as an example, but the present invention is not limited to this.
For example, as shown in FIG. 2, a heat source device 101 having a structure called a so-called single can / two water type may be used. In other words, a hot water supply combustion unit 104 a and a combustion heating combustion unit 104 b capable of independent combustion control are provided inside one can body, and a heat source including a blower 105 that supplies air to these two combustion units 104. The machine 101 may be used.

More specifically, in the heat source apparatus 101, the partition plate 108 is provided to form two spaces, and the primary heat exchanger 6 and the secondary heat exchanger 7 are provided in each space. And the combustion gas produced | generated in the combustion part 104a for hot water supply passes the primary heat exchanger 6 on the right side, and the secondary heat exchanger 7 on the right side, and the combustion gas produced | generated in the combustion part 104b for additional heating is left side The structure passes through the primary heat exchanger 6 and the left secondary heat exchanger 7. That is, two combustion systems 103 are formed inside one can body.
Therefore, similarly to the heat source apparatus 1 described above, even when the heating operation is performed only in the primary heat exchanger 6 and the secondary heat exchanger 7 belonging to one of the combustion systems 103, the other combustion system 103 is used. In addition, air is supplied from the blower 105 side.

  In such a heat source apparatus 101, when the above-described control is performed, the hot water supply side antifreeze heater 16 is attached to a position from the primary heat exchanger 6 (or the secondary heat exchanger 7) on one side, The circulation side antifreeze heater 17 is attached at a position from the primary heat exchanger 6 (or secondary heat exchanger 7) on the side. That is, the hot water supply side freeze prevention heater 16 and the circulation side freeze prevention heater 17 are respectively attached to different positions of one can body.

In the above-described embodiment, the hot water supply side freeze prevention heater 16 is attached to the primary heat exchanger 6 belonging to the relatively large combustion system 3a located on the right side, and the circulation side freeze prevention is attached to the primary heat exchanger 6 belonging to the other combustion system 3b. Although the example which attached the heater 17 was shown, this invention is not restricted to this.
The hot water supply side antifreeze heater 16 and the circulation side antifreeze heater 17 may be attached to other equipment in which liquid flows, that is, the secondary heat exchanger 7 or the like. Moreover, you may attach to the various piping connected with the apparatus incorporated in the heat source machine 1 (heat source machine 101).

DESCRIPTION OF SYMBOLS 1,101 Heat source machine 2 Case 3,103 Combustion system 4,104 Combustion part 5,105 Blower 6 Primary heat exchanger (Heat exchange part, heating object member)
7 Secondary heat exchanger (heat exchanger)
12 Supply air temperature sensor (temperature sensor)
13 Atmospheric temperature sensor (temperature sensor)
16 Hot water supply side freeze prevention heater (freeze prevention heater)
17 Circulation-side freeze prevention heater (freeze prevention heater)
50 Heating circulation path (circulation circuit)

Claims (7)

A casing, a combustion section capable of performing a combustion operation for burning fuel supplied from the outside by a combustion burner, and a heat exchange section for recovering heat of combustion gas generated by the combustion operation of the combustion section A combustion system having at least a blower for supplying combustion air to the combustion section;
A plurality of the combustion systems are provided,
In a situation where the combustion operation is not performed in at least one of the combustion systems and the combustion operation is performed in the other combustion systems, the air blown from the blower to the combustion system in which the combustion operation is not performed In the heat source machine that flows in,
A temperature sensor capable of detecting a temperature of a predetermined portion in the housing;
In a heating target member including at least one of equipment and piping in which liquid flows therein, a freeze prevention operation for preventing freezing of the liquid inside the heating target member is performed, and a plurality of the combustion systems The heat source machine is characterized in that the operation content of the antifreezing operation is changed based on the state of implementation of the combustion operation in and the value detected by the temperature sensor. A freeze prevention heater for heating the heating target member;
The freeze prevention operation includes an operation of operating the freeze prevention heater for a predetermined time within a predetermined period,
In the operation, the length of the predetermined period and / or the length of the operation time when the freeze prevention heater is operated based on the implementation status of the combustion operation in the plurality of combustion systems and the value detected by the temperature sensor. The heat source machine according to claim 1, wherein the heat source machine is changed. A freeze prevention heater for heating the heating target member;
The anti-freezing operation is an operation in which the temperature detected by the temperature sensor is compared with a reference temperature or temperature range, and the anti-freezing heater is operated for a predetermined time within a predetermined period based on the comparison result. Including
In the operation, the reference temperature or temperature range is changed based on an implementation status of a combustion operation in a plurality of the combustion systems and a value detected by the temperature sensor. The heat source machine described. In the antifreezing operation, the amount of air blown from the blower that supplies combustion air to the combustion system performing the combustion operation in a situation where the combustion operation is performed in any one of the combustion systems Including driving to reduce
4. The operation according to claim 1, wherein the amount of air blown from the blower is reduced based on a state of execution of the combustion operation in the plurality of combustion systems and a value detected by the temperature sensor. The heat source machine described in 1. A circulation circuit through which the heat medium circulates;
The freeze prevention operation includes an operation of circulating the heat medium for a predetermined time within a predetermined period in the circulation circuit,
In the operation, the length of the predetermined period when the heat medium is circulated and / or the length of the time during which the heat medium is circulated based on the implementation status of the combustion operation in the plurality of combustion systems and the value detected by the temperature sensor. The heat source machine according to claim 1, wherein the heat source machine is changed. A casing, a combustion section capable of performing a combustion operation for burning fuel supplied from the outside by a combustion burner, and a heat exchange section for recovering heat of combustion gas generated by the combustion operation of the combustion section A combustion system having at least a blower for supplying combustion air to the combustion unit, and a temperature sensor capable of detecting the temperature of a predetermined portion in the housing;
A plurality of the combustion systems are provided,
In a situation where the combustion operation is not performed in at least one of the combustion systems and the combustion operation is performed in the other combustion systems, the air blown from the blower to the combustion system in which the combustion operation is not performed An anti-freezing control method that can be implemented with an inflow heat source machine,
In a heating target member including at least one of a device or a pipe through which liquid flows, a freeze prevention operation for preventing freezing of the liquid inside the heating target member is performed, and a plurality of the combustion systems An anti-freezing control method characterized in that the operation content of the anti-freezing operation is changed based on the state of implementation of the combustion operation and the value detected by the temperature sensor. The anti-freezing operation is
The freeze prevention heater attached to the member to be heated is operated for a predetermined time within a predetermined period, and the freezing is performed based on the status of the combustion operation in the plurality of combustion systems and the value detected by the temperature sensor. An operation for changing the length of the predetermined period and / or the length of the operation time when operating the prevention heater;
The temperature detected by the temperature sensor is compared with a reference temperature or temperature range, and based on the comparison result, the freeze prevention heater attached to the heating target member is operated for a predetermined time within a predetermined period. The operation of changing the reference temperature or temperature range based on the implementation status of the combustion operation in the plurality of combustion systems and the value detected by the temperature sensor;
In a situation where a combustion operation is performed in any one of the combustion systems, the amount of air blown from the blower that supplies combustion air to the combustion system performing the combustion operation is reduced, and a plurality of 7. The method according to claim 6, further comprising at least one operation among operations for reducing the amount of air blown from the blower based on an implementation status of a combustion operation in the combustion system and a value detected by the temperature sensor. The freeze prevention control method as described.

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