Abstract: A hot water supply device includes: a combustion part including a first burner part for which a flame sensor is disposed and a second burner part having a different number of burners from the first burner part such that one or both of the burner parts perform combustion, the flame sensor being configured to detect combustion state information of a flame generated by burners; a combustion control part configured to monitor a combustion mode of the combustion part set in accordance with a hot water supply request and change a second combustion mode in which the first burner part does not perform combustion, to a first combustion mode in which at least the first burner part performs combustion, when the second combustion mode is continuing; and a combustion adjustment control part configured to execute a combustion adjustment process of the combustion part.

Abstract: A heat source system is to be connected to another heat source system. The heat source system includes a heat source device and a control part. The heat source device includes a water regulation valve configured to regulate a flow rate of supply water flowing in the device and is configured to heat the supply water. The control part is connected to the heat source device, and is configured to acquire flow rate information of the supply water supplied to the other heat source system and the heat source device, to close the water regulation valve when a flow rate of the supply water is 0 or more and less than a first set value, and to open the water regulation valve when the flow rate of the supply water is equal to or greater than the first set value.

Abstract: A heat exchanging unit exchanges heat between a fluid to be heated and exhaust gas. The heat exchanging unit includes a heat exchange portion, a header portion, and a flow changing portion. The heat exchange portion includes a heat exchange pipe in the interior of which the fluid to be heated flows. The header portion is connected to the heat exchange pipe, the header portion allowing the fluid to be heated to flow from the header portion to the heat exchange pipe or from the heat exchange pipe to the header portion. The flow changing portion changes the state of flow of the exhaust gas introduced into the heat exchange portion.

Abstract: A method of controlling a proportional solenoid valve whose valve opening degree is controlled by excitation of a proportional solenoid includes: generating a driving current (id) that excites a proportional solenoid (28); reversing a polarity of the driving current (id) at a cycle faster than movement of a valve body (18); and controlling the valve opening degree by a current level of the driving current (id). As a result, an alternating magnetic field is generated in the proportional solenoid so that a desired valve opening degree is obtained by the driving current level while obviating the influence of the residual magnetism.

Abstract: A premixing apparatus includes a mixing unit, an air supply adjusting unit, and a gas switching unit. The mixing unit draws a fuel gas in the mixing unit by supplied air to mix the fuel gas and the supplied air with each other. The air supply adjusting unit applies a load on the supplied air flowing toward the mixing unit and switches the load. The gas switching unit switches a gas amount of the fuel gas to be supplied to the mixing unit.

Abstract: A premixing apparatus includes a mixing unit, an air supply adjusting unit, and a gas switching unit. The mixing unit draws a fuel gas in the mixing unit by supplied air to mix the fuel gas and the supplied air with each other. The air supply adjusting unit applies a load on the supplied air flowing toward the mixing unit and switches the load. The gas switching unit switches a gas amount of the fuel gas to be supplied to the mixing unit.

Abstract: A heat source system is to be connected to another heat source system. The heat source system includes a heat source device and a control part. The heat source device includes a water regulation valve configured to regulate a flow rate of supply water flowing in the device and is configured to heat the supply water. The control part is connected to the heat source device, and is configured to acquire flow rate information of the supply water supplied to the other heat source system and the heat source device, to close the water regulation valve when a flow rate of the supply water is 0 or more and less than a first set value, and to open the water regulation valve when the flow rate of the supply water is equal to or greater than the first set value.

Abstract: High intensity combustion and low intensity combustion are carried out together, to stabilize flames and to hold down the emission of carbon monoxide. An air-fuel mixture outlet member (back plate) that includes a single or a plurality of outlet(s) (air-fuel mixture outlet(s)) out of which an air-fuel mixture (GA) flows is include, and a metal fiber knitting body (metal knit) that covers the air-fuel mixture outlet member is included. Therefor, the air-fuel mixture, which is made to flow out of the outlet(s), passes through the metal fiber knitting body (metal knit) and is combusted, a flame of low intensity (flame) is generated together with a flame of high intensity (flame) by combustion of the air-fuel mixture, and the flame of low intensity holds the flame of high intensity.

Abstract: A hot water supply device includes: a combustion part including a first burner part for which a flame sensor is disposed and a second burner part having a different number of burners from the first burner part such that one or both of the burner parts perform combustion, the flame sensor being configured to detect combustion state information of a flame generated by burners; a combustion control part configured to monitor a combustion mode of the combustion part set in accordance with a hot water supply request and change a second combustion mode in which the first burner part does not perform combustion, to a first combustion mode in which at least the first burner part performs combustion, when the second combustion mode is continuing; and a combustion adjustment control part configured to execute a combustion adjustment process of the combustion part.

Abstract: A heat exchanger tube for transferring a heat of an exhaust gas to a fluid to be heated includes a turn-back portion formed in an intermediate portion of the heat exchanger tube and a reciprocating conduit portion. The reciprocating conduit portion includes a conduit portion leading from a starting end of the heat exchanger tube to the turn-back portion, and a conduit portion leading from the turn-back portion to a terminal end of the heat exchanger tube. A space equal to or greater than the outer diameter of the conduit portions is provided between these conduit portions.

Abstract: The filter device includes a supply air introducing part, a filter main body part and a discharge part. The supply air introducing part takes in an outside air. The filter main body part includes a ventilation pipe connected to the supply air introducing part to allow the outside air to flow through the ventilation pipe and a filter housing part being equipped with an outflow hole allowing the outside air to flow outside at a position higher than a position of the opening part of the ventilation pipe to separate, from the outside air, a liquid in a liquid state or a state close thereto. The liquid is taken in together with the outside air. The discharge part discharges at least the separated liquid from the filter main body part.

Abstract: A piping connection unit of a combustion apparatus supplying and discharging air through a duct includes an apparatus-side connecting part, a connecting part and a spacer. The apparatus-side connecting part is to be connected to an air supply part or an exhaust part of the combustion apparatus. The connecting part has a diameter larger than a diameter of the apparatus-side connecting part, and communicates with the apparatus-side connecting part to be connected to a duct to be inserted from an opening part. The spacer is detachably disposed in the connecting part. The spacer is disposed between an inner wall of the connecting part and the duct to be inserted when the duct has a pipe diameter smaller than an inner diameter of the connecting part. The spacer is removed from the connecting part when the duct has a pipe diameter equivalent to the inner diameter of the connecting part.

Abstract: The pressure and circulation culture apparatus includes a holder (culture chamber part), a pressure transmission part and a culture solution circulation line (culture circuit). The holder is a means that reserves culture solution and that holds a cultured object. The pressure transmission part is a means that communicates with the holder and transmits an external pressure to the culture solution. The culture solution circulation line is a means that is connected to the holder via the pressure transmission part, and circulates the culture solution through the holder via the pressure transmission part. Such a structure is included, and an external pressure is made to operate on the culture solution via the pressure transmission part to allow pressure on the cultured object in the holder and circulation of the culture solution in the holder.

Abstract: A premixing apparatus includes a mixing unit, an air supply adjusting unit, and a gas switching unit. The mixing unit draws a fuel gas in the mixing unit by supplied air to mix the fuel gas and the supplied air with each other. The air supply adjusting unit applies a load on the supplied air flowing toward the mixing unit and switches the load. The gas switching unit switches a gas amount of the fuel gas to be supplied to the mixing unit.

Abstract: A premixing apparatus includes a mixing unit, an air supply adjusting unit, and a gas switching unit. The mixing unit draws a fuel gas in the mixing unit by supplied air to mix the fuel gas and the supplied air with each other. The air supply adjusting unit applies a load on the supplied air flowing toward the mixing unit and switches the load. The gas switching unit switches a gas amount of the fuel gas to be supplied to the mixing unit.

Abstract: A heat exchanging unit exchanges heat between a fluid to be heated and exhaust gas. The heat exchanging unit includes a heat exchange portion, a header portion, and a flow changing portion. The heat exchange portion includes a heat exchange pipe in the interior of which the fluid to be heated flows. The header portion is connected to the heat exchange pipe, the header portion allowing the fluid to be heated to flow from the header portion to the heat exchange pipe or from the heat exchange pipe to the header portion. The flow changing portion changes the state of flow of the exhaust gas introduced into the heat exchange portion.

Abstract: High intensity combustion and low intensity combustion are carried out together, to stabilize flames and to hold down the emission of carbon monoxide. An air-fuel mixture outlet member (back plate) that includes a single or a plurality of outlet(s) (air-fuel mixture outlet(s)) out of which an air-fuel mixture (GA) flows is included, and a metal fiber knitting body (metal knit) that covers the air-fuel mixture outlet member is included. Therefore, the air-fuel mixture, which is made to flow out of the outlet(s), passes through the metal fiber knitting body (metal knit) and is combusted, a flame of low intensity is generated together with a flame of high intensity by combustion of the air-fuel mixture, and the flame of low intensity holds the flame of high intensity.

Abstract: The filter device includes a supply air introducing part, a filter main body part and a discharge part. The supply air introducing part takes in an outside air. The filter main body part includes a ventilation pipe connected to the supply air introducing part to allow the outside air to flow through the ventilation pipe and a filter housing part being equipped with an outflow hole allowing the outside air to flow outside at a position higher than a position of the opening part of the ventilation pipe to separate, from the outside air, a liquid in a liquid state or a state close thereto. The liquid is taken in together with the outside air. The discharge part discharges at least the separated liquid from the filter main body part.

Abstract: A piping connection unit of a combustion apparatus supplying and discharging air through a duct includes an apparatus-side connecting part, a connecting part and a spacer. The apparatus-side connecting part is to be connected to an air supply part or an exhaust part of the combustion apparatus. The connecting part has a diameter larger than a diameter of the apparatus-side connecting part, and communicates with the apparatus-side connecting part to be connected to a duct to be inserted from an opening part. The spacer is detachably disposed in the connecting part. The spacer is disposed between an inner wall of the connecting part and the duct to be inserted when the duct has a pipe diameter smaller than an inner diameter of the connecting part. The spacer is removed from the connecting part when the duct has a pipe diameter equivalent to the inner diameter of the connecting part.

Abstract: A heat exchanger tube for transferring a heat of an exhaust gas to a fluid to be heated includes a turn-back portion formed in an intermediate portion of the heat exchanger tube and a reciprocating conduit portion. The reciprocating conduit portion includes a conduit portion leading from a starting end of the heat exchanger tube to the turn-back portion, and a conduit portion leading from the turn-back portion to a terminal end of the heat exchanger tube. A space equal to or greater than the outer diameter of the conduit portions is provided between these conduit portions.