JP2013170772A - Heat source device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat source device for preventing degradation in a heating heat exchanger when shifting from an individual operation of a hot water supply operation or a heating operation to simultaneous operation of the hot water supply operation and the heating operation.SOLUTION: A controller 20 controls a combustion amount of a hot water supply burner 4-1 by hot water supply capacity switching valves 43L, 43M, 43S and a gas proportional valve 42 so that a temperature of hot water supplied from a hot water supply pipe 8b may become a target hot water supply temperature, and also controls a combustion amount of a heating burner 4-2 by heating capacity switching valves 44L and 44S so that a temperature of hot water sent out from a heating heat exchanger 3-2 to a heating circulation circuit 9 may approach a target heating supply temperature during simultaneous operation of a hot water supply operation and a heating operation, and starts combustion of the heating burner 4-2 in a state of making a combustion range of the heating burner 4-2 smaller than the maximum combustion range by the heating capacity switching valves 44L and 44S when shifting from an individual operation of the hot water supply operation or the heating operation to the simultaneous operation of the hot water supply operation and the heating operation.

Description

  The present invention relates to a heat source device having a hot water supply function and a heating function.

  Conventionally, a hot water supply burner for heating a hot water supply heat exchanger connected to a water supply pipe and a hot water supply pipe, and a heating burner for heating a heating heat exchanger connected in the middle of a hot water circulation path to which a hot water heating terminal is connected The hot water supply burner and the heating burner are composed of a plurality of burner blocks, and the opening change valve for changing the opening of the fuel gas supply pipe connected to the hot water supply burner and the heating burner is common to the hot water supply burner and the heating burner. There is known a heat source device in which only one is provided (for example, see Patent Document 1).

  In the heat source device described in Patent Document 1, the combustion amounts of the hot water supply burner and the heating burner are changed by the combination of the selection of the burner block to be burned in each burner and the opening of the opening changing valve.

  In this case, when the hot water supply burner or the heating burner is burned alone, the supply of the fuel gas to the non-burning burner is shut off, and the fuel gas supply flow rate to the burning burner by the opening change valve However, when the hot water supply burner and the heating burner are burned simultaneously, the supply flow rate of the fuel gas to the hot water supply burner and the heating burner cannot be individually changed by the opening degree change valve.

  Therefore, in the heat source device described in Patent Literature 1, when the hot water supply operation and the heating operation are performed simultaneously, the hot water supply operation is prioritized and the gas is supplied by the opening change valve so that hot water at a predetermined target hot water supply temperature is obtained. The combustion amount of the hot water supply burner is controlled by adjusting the opening of the pipe, and the heating burner side controls the combustion amount by switching the burner block to be burned.

  Further, when the heating burner is constituted by a plurality of burner blocks, the combustion air supplied to the burner block in the fire extinguishing state is not used for combustion but is mixed with the combustion exhaust gas of the burner block in the combustion state. As a result, the temperature of the combustion exhaust gas from the heating burner decreases, and the thermal efficiency in the heating heat exchanger heated by the combustion exhaust gas decreases. Then, the structure which increased the thermal efficiency in a heating heat exchanger by enlarging the combustion range by increasing the burner block to burn as much as possible at the time of heating operation is proposed (for example, refer patent document 2).

JP 2006-112660 A JP 2007-285625 A

  In the heat source device described in Patent Literature 1, when the hot water supply or the heating operation is switched to the simultaneous operation of the hot water supply operation and the heating operation, the combustion amount of the hot water supply burner is burned so as to obtain the target hot water supply temperature. Although it is adjusted by the opening of the burner block and the opening change valve, the heating burner has an excessive amount of combustion because the opening of the opening change valve depends on the control on the hot water supply burner side. Therefore, the hot water in the heating heat exchanger may boil and the heating heat exchanger may be deteriorated.

  The present invention has been made in view of such a background, and a heat source device that prevents deterioration of a heating heat exchanger when shifting from a single operation of hot water supply or a heating operation to a simultaneous operation of a hot water supply operation and a heating operation. The purpose is to provide.

The present invention has been made to achieve the above object,
A hot water heat exchanger connected to the hot water pipe and hot water pipe,
A hot water supply burner configured by a plurality of hot water supply burner blocks that divide the combustion range, and for heating the hot water supply heat exchanger;
A heating heat exchanger connected in the middle of the heating circulation circuit to which the heating terminal is connected;
A heating burner configured to include a plurality of heating burner blocks that divide a combustion range, and that heats the heating heat exchanger;
A gas opening degree change valve that is provided in a common fuel gas supply path for the hot water supply burner and the heating burner, and changes the opening degree of the fuel gas supply path;
A hot water supply capacity switching valve for switching the supply and shutoff of fuel gas from the fuel gas supply path to each hot water supply burner block for each hot water supply burner block;
A heating capacity switching valve that switches between supply and shutoff of fuel gas from the fuel gas supply path to each heating burner block for each heating burner block;
A hot water supply operation in which the hot water supply burner is burned and the water supplied from the water supply pipe is heated by the hot water supply heat exchanger and discharged to the hot water supply pipe, and the heating burner is burned and the heat flowing through the heating circulation circuit The present invention relates to a heat source device including a controller that performs a heating operation in which a medium is heated by the heating heat exchanger.

And the controller
During the single operation of the hot water supply operation, the combustion amount of the hot water supply burner is controlled by the hot water supply capacity switching valve and the gas opening change valve so that the temperature of the hot water supplied from the hot water supply pipe becomes the target hot water supply temperature. And
During the single operation of the heating operation, the heating capacity switching valve and the gas opening change valve are used so that the temperature of the heat medium sent from the heating heat exchanger to the heating circulation circuit becomes a target heating supply temperature. Control the amount of combustion of the heating burner;
During the simultaneous operation of the hot water supply operation and the heating operation, the hot water supply burner is controlled by the hot water supply capacity switching valve and the gas opening change valve so that the temperature of the hot water supplied from the hot water supply pipe becomes the target hot water supply temperature. The amount of combustion is controlled, and the amount of combustion of the heating burner is controlled by the heating capacity switching valve so that the temperature of the heat medium sent from the heating heat exchanger to the heating circulation circuit approaches the target heating supply temperature And
When shifting from the hot water supply operation or the single operation of the heating operation to the simultaneous operation of the hot water supply operation and the heating operation, the combustion range of the heating burner is reduced from the maximum combustion range by the heating capacity switching valve. The combustion of the heating burner is started (first invention).

  According to the first aspect of the invention, when the controller shifts from the hot water supply operation or the single operation of the heating operation to the simultaneous operation of the hot water supply operation and the heating operation, the heating capacity switching valve controls the combustion range of the heating burner. The combustion of the heating burner is started in a state where is reduced from the maximum combustion range. Thus, by starting the combustion of the heating burner in a state where the combustion range of the heating burner is reduced from the maximum combustion range, the heating of the heating heat exchanger by the heating burner is unlikely to become excessive. Therefore, it is possible to prevent the heating heat exchanger from deteriorating due to the boiling of the heat medium in the heating heat exchanger.

In the first invention,
When the controller shifts from the hot water supply operation or the single operation of the heating operation to the simultaneous operation of the hot water supply operation and the heating operation, in the state where the combustion range of the heating burner is minimized by the heating capacity switching valve, Combustion of the heating burner is started, and then the heating capacity switching valve controls the heating burner so that the temperature of the heat medium supplied from the heating heat exchanger to the heating circulation circuit approaches the target heating supply temperature. The combustion amount is controlled (second invention).

  According to the second invention, when the controller shifts from the single operation of the hot water supply operation to the simultaneous operation of the hot water supply operation and the heating operation, the heating range switching valve minimizes the combustion range of the heating burner. By starting combustion of the heating burner in the state, it can be expected that the heating of the heating heat exchanger by the heating burner becomes less excessive.

The block diagram of a heat-source apparatus. Explanatory drawing which showed the relationship between heating burner combustion amount and thermal efficiency. The 1st flowchart of the heating operation in the case of performing hot water supply operation and heating operation simultaneously. The 2nd flowchart of the heating operation in the case of performing hot water supply operation and heating operation simultaneously.

  An embodiment of the present invention will be described with reference to FIGS.

  Referring to FIG. 1, in the heat source device of the present embodiment, a hot water supply combustion unit 2-1 for hot water supply and a heating combustion unit 2-2 for heating and reheating are partitioned in a single can 1. 1 is a can-type combined heat source device arranged side by side with 1a therebetween, and the entire operation is controlled by the controller 20.

  The controller 20 is an electronic circuit unit configured by a CPU, a memory, an input / output interface, etc. (not shown), and the controller 20 executes a control program for the heat source device held in the memory by the CPU. It performs the function of executing “hot water supply operation”, “hot water operation”, “reheating operation”, and “heating operation”.

  A remote controller 25 for remotely operating the heat source device is connected to the controller 20. The remote control 25 has a hot water filling switch 27 for instructing execution of the “hot water operation”, a reheating switch 28 for instructing execution of the “hot operation”, and the heat source device in an operating state (execution of each operation is performed). An operation switch 29, a display unit 26, and the like are provided for switching between a possible state) and a standby state (a state in which each operation cannot be performed and only a switching operation to the operation state is possible).

  The hot water supply combustion unit 2-1 includes a hot water supply heat exchanger 3-1, and a hot water supply burner 4-1. The heating combustion unit 2-2 includes a heating heat exchanger 3-2 for heating and reheating, and a heating burner 4-2 for heating the heating heat exchanger 3-2. Combustion air is supplied from a common combustion fan 5 to the hot water supply combustion unit 2-1 and the heating combustion unit 2-2.

  The combustion exhaust from the hot water supply burner 4-1 is guided to the hot water supply heat exchanger 3-1 and exchanges heat with the hot water supply heat exchanger 3-1, and then the hot water supply heat exchanger 3-1 and the heating heat exchanger 3-2. The gas flows into the upper exhaust hood 6 and is discharged to the outside through an exhaust port 6 a formed in the exhaust hood 6. Similarly, the combustion exhaust from the heating burner 4-2 is guided to the heating heat exchanger 3-2 and is exchanged by the heating heat exchanger 3-2, and then flows into the exhaust hood 6 to the outside through the exhaust port 6a. Discharged. The rotation speed of the combustion fan 5 is controlled by the controller 20 so that the amount of combustion air corresponding to the amount of combustion of the hot water supply burner 4-1 and the heating burner 4-2 is supplied.

  An upstream water supply pipe 8a and a downstream hot water supply pipe 8b are connected to the hot water supply heat exchanger 3-1. The water supply pipe 8 a is provided with a flow rate sensor 81 and a flow rate adjustment valve 82 controlled by the controller 20. Further, a bypass pipe 8c that communicates the water supply pipe 8a and the hot water supply pipe 8b is provided on the downstream side of the flow control valve 82, and a bypass flow control valve 83 that is controlled by the controller 20 is provided in the bypass pipe 8c. Further, the hot water supply pipe 8b is provided with an upstream hot water temperature sensor 84 and a downstream hot water temperature sensor 85 at a junction with the bypass pipe 8c.

  Detection signals from the flow sensor 81 and the hot water temperature sensors 84 and 85 are input to the controller 20. Then, the controller 20 opens the currant 86 at the downstream end of the hot water supply pipe 8b, starts water flow to the hot water supply heat exchanger 3-1, and the detected flow rate of the flow rate sensor 81 becomes equal to or higher than a predetermined lower limit flow rate. Sometimes, the combustion fan 5 is driven and the hot water supply burner 4-1 is ignited to execute the “hot water supply operation”.

  During the “hot water supply operation”, the controller 20 controls the combustion amount of the hot water supply burner 4-1 so that the detected temperature of the hot water temperature sensor 85 becomes the hot water supply temperature (target hot water supply temperature) set by the remote controller 25, and bypasses. The flow rate adjustment valve 83 controls the amount of flowing water (bypass mixing amount) of the bypass pipe 8c.

  Moreover, even if the combustion amount of the hot water supply burner 4-1 is maximized, the controller 20 uses the flow rate adjusting valve 82 to supply the water supply pipe 8a when the detected temperature of the hot water temperature sensor 85 does not reach the hot water temperature set by the remote controller 25. Reduce water flow.

  The heating heat exchanger 3-2 is in the middle of the heating circulation circuit 9 to which a hot water type hot air heater 10 (corresponding to the heating terminal of the present invention) that is a high temperature heating terminal having a relatively high required hot water temperature is connected. It is connected. The heating circulation circuit 9 includes a heating forward pipe 9 a that sends hot water (corresponding to a heat medium of the present invention) heated by the heating heat exchanger 3-2 to the hot air heater 10, and the hot air heater 10. It comprises a heating return pipe 9b for returning the circulated hot water to the heating heat exchanger 3-2.

  A systern 91 and a heating pump 92 controlled by the controller 20 are interposed in the heating return pipe 9b. And when the operation switch (not shown) of the warm air heater 10 is turned ON, the controller 20 opens the water flow valve 10a of the warm air heater 10 and drives the heating pump 92, A “heating operation” is performed in which hot water is circulated between the hot air heater 10 and the heating heat exchanger 3-2 via the heating circulation circuit 9.

  Moreover, in this embodiment, the floor heating panel 11 (equivalent to the heating terminal of this invention) which is a low temperature heating terminal whose required hot water temperature is comparatively low is provided, and the heating return pipe 9b downstream of the heating pump 92 is provided. The low-temperature heating forward pipe 9c is branched from the portion to the floor heating panel 11. The hot water circulated in the floor heating panel 11 joins the hot water circulated in the hot air heater 10 and returns to the systern 91.

  Further, the heating circulation circuit 9 is provided with a bypass pipe 9d. When an operation switch (not shown) of the floor heating panel 11 is turned ON, the controller 20 opens the water passage valve 11a of the floor heating panel 11 and drives the heating pump 92 to execute “heating operation”. To do. Thereby, while warm water is circulated to the heating heat exchanger 3-2 via the bypass pipe 9d, a part of the warm water sent from the heating pump 92 is supplied to the floor heating panel 11, and the heating heat exchanger 3 -2 is transferred to the floor heating panel 11 via the cistern 91.

  A hot water temperature sensor 93 that detects the temperature of hot water sent from the heating heat exchanger 3-2 is provided upstream of the heating forward pipe 9a, and a detection signal of the hot water temperature sensor 93 is input to the controller 20. The The controller 20 determines the heating-side hot water temperature detected by the hot water temperature sensor 93 when the operation switch (not shown) of the hot air heater 10 or the floor heating panel 11 is turned ON to perform “heating operation”. The combustion amount of the heating burner 4-2 is controlled so as to be the required hot water temperature (target heating supply temperature) of the hot air heater 10 and the floor heating panel 11. The required hot water temperature of the hot air heater 10 is relatively high (for example, 80 ° C.), and the required hot water temperature of the floor heating panel 11 is relatively low (for example, 60 ° C.).

  Moreover, the heating heat exchanger 3-2 also functions as a heat source when performing bath renewal. A bath pump 131 and a liquid heat exchanger 132 controlled by the controller 20 are interposed in the bath circulation circuit 13 (consisting of a bath outlet pipe 13a and a bath return pipe 13b) connected to the bathtub 12. Yes. In addition, the heating circulation circuit 9 is provided with a reheating pipe 9e from the heating forward pipe 9a to the cistern 91 through the liquid heat exchanger 132.

  When the reheating switch 28 provided in the remote controller 25 is turned ON, the controller 20 drives the bath pump 131 to circulate hot water in the bathtub 12 through the bath circulation circuit 13 and drives the heating pump 92. Then, the heating burner 4-2 is ignited to execute the “chase operation”. In the “reheating operation”, hot water heated by the heating heat exchanger 3-2 circulates in the heating circulation circuit 9 via the liquid heat exchanger 132 and circulates in the bath circulation circuit 13. Is heated by the liquid-liquid heat exchanger 132.

  A return temperature sensor 141 (detection temperature Tin) is provided on the return side and a return temperature sensor 140 (detection temperature Tout) is provided on the return side in the vicinity of the connection point between the bath circulation circuit 13 and the liquid-liquid heat exchanger 132. It has been. The bath circulation circuit 13 is provided with a bath water flow switch 142 for detecting that hot water is circulating in the bath circulation circuit 13. Then, detection signals from the return temperature sensor 141, the forward temperature sensor 140, and the bath water flow switch 142 are input to the controller 20. The controller 20 ends the “tracking operation” when the temperature detected by the return temperature sensor 141 rises to the tracking temperature set by the remote controller 25.

  In addition, a hot water filling pipe 135 branched from the hot water supply pipe 8 b is connected to the bath circulation circuit 13 by X via a check valve 136. A hot water on / off valve 137 controlled by the controller 20 is interposed in the hot water tube 135. When the hot water filling switch 27 provided in the remote controller 25 is turned on, the controller 20 opens the hot water opening / closing valve 137 to supply hot water heated by the hot water supply heat exchanger 3-1. Then, the “water filling operation” for supplying the bathtub 12 to the water filling level (water filling set water level) set by the remote controller 25 is executed.

  Next, a configuration for supplying fuel gas to the hot water supply burner 4-1 and the heating burner 4-2 will be described. The common fuel gas supply path 40 for the hot water supply burner 4-1 and the heating burner 4-2 includes a gas main valve 41 for opening and closing the fuel gas supply path 40 and a gas proportional valve 42 for changing the opening degree of the fuel gas supply path 40. (Corresponding to the gas opening degree change valve of the present invention. A servo valve may be used).

  Then, the fuel gas is supplied from the fuel gas supply path 40 to the hot water supply burner 4-1 through the hot water supply capacity switching valves 43S, 43M, 43L for the hot water supply burner 4-1. Further, the fuel gas is supplied from the fuel gas supply path 40 to the heating burner 4-2 through the heating capacity switching valves 44S and 44L for the heating burner 4-2.

  Here, the hot water supply burner 4-1 is composed of 16 unit burners 4a, and the hot water supply burner block 4-1S connected to the hot water supply capacity switching valve 43S includes three unit burners 4a, and the hot water supply capacity switching valve 43M. The hot-water supply burner block 4-1M connected to is provided with five unit burners 4a, and the hot-water supply burner block 4-1L connected to the hot-water supply capacity switching valve 43L is provided with eight unit burners 4a.

  The combustion range (combustion area) of the hot water supply burner 4-1 is divided by a plurality of hot water supply burner blocks 4-1S, 4-1M, 4-1L, and the controller 20 opens and closes the hot water supply capacity switching valves 43S, 43M, 43L. Switch to change the combustion range of hot water burner 4-1.

  The heating burner 4-2 includes five unit burners 4a. The heating burner block 4-2S connected to the heating capacity switching valve 44S includes two unit burners 4a. The connected heating burner block 4-2L includes three unit burners 4a.

  The combustion range (combustion area) of the heating burner 4-2 is partitioned by a plurality of heating burner blocks 4-2S and 4-2L, and the controller 20 switches the opening and closing of the heating capacity switching valves 44S and 44L to burn the heating burner. Change the range.

  Here, the controller 20 increases the thermal efficiency of the heat exchanger by increasing the combustion range of the burner as much as possible when controlling the combustion amount of the heating burner 4-2. For example, the combustion range of the heating burner 4-2 is set to a “combustion range large” setting in which both the heating capacity switching valve 44L and the heating capacity switching valve 44S are opened, and the heating capacity switching valve 44L is opened. 44S is switched to the “combustion range” setting, and the heating capacity switching valve 44S is opened and the heating capacity switching valve 44L is closed to the “combustion range small” setting. The thermal efficiency in each combustion range is As shown in FIG.

  In FIG. 2, the horizontal axis is set to the combustion amount of the heating burner 4-2, the vertical axis is set to the thermal efficiency in the heating heat exchanger 3-2, and “combustion range is small” (S1 to S2), “combustion” This shows the relationship between the adjustment range of the combustion amount and the thermal efficiency in “in range” (M1 to M2) and “large combustion range” (L1 to L2). As is clear from FIG. 2, when the heating burner 4-2 is burned with the same combustion amount, the thermal efficiency becomes higher when the combustion range is enlarged.

  For example, when the heating burner 4-2 is combusted with the combustion amount B1, it is better to control to PL with the gas proportional valve 42 at "large combustion range" than to control to PM with the gas proportional valve 42 in "combustion range". , Thermal efficiency is high. Therefore, the controller 20 controls the combustion amount of the heating burner 4-2 by the gas proportional valve 42 by increasing the combustion range of the heating burner 4-2 as much as possible during the single operation of the heating operation.

  Next, since the gas proportional valve 42 is provided in the fuel gas supply path 40 common to the hot water supply burner 4-1 and the heating burner 4-2, the hot water supply burner 4 is simultaneously operated during the hot water supply operation and the heating operation. -1 and heating burner 4-2 cannot be individually controlled by the gas proportional valve 42.

  For this reason, the controller 20 gives priority to the hot water supply burner 4-1 during simultaneous operation of the hot water supply operation and the heating operation, and the combustion amount is controlled by the gas proportional valve 42 for the hot water supply burner 4-1 so that the target hot water supply temperature is obtained. To do. On the other hand, as shown in the flowcharts of FIGS. 3 to 4, the heating burner 4-2 requests the hot water temperature Th from the heating heat exchanger 3-2 by switching the combustion range and controlling the combustion amount. Move closer to hot water.

  In STEP 1 of FIG. 3, the process proceeds to STEP 2 when an instruction to start the other operation is given during either one of the heating operation (heating operation by the hot air heater 10 or the floor heating panel 11) or the hot water supply operation. The controller 20 starts the other operation, and performs the simultaneous operation of the heating operation and the hot water supply operation.

  In STEP2, the controller 20 performs the ignition process of the heating burner 4-2 with the heating burner 4-2 as “small combustion range” (heating capacity switching valve 44S: valve opening, heating capacity switching valve 44S: valve closing). Thus, by setting the combustion range of the heating burner 4-2 to the minimum “combustion range small”, starting the combustion of the heating burner 4-2, the simultaneous operation of the hot water supply operation and the heating operation is started, and the target hot water supply is started. When the opening of the gas proportional valve 42 is adjusted so that hot water of temperature is obtained, the heating of the heating heat exchanger 3-2 by the heating burner 4-2 becomes excessive, and the heating heat exchanger 3-2 It is possible to prevent hot water from boiling and deterioration of the heating heat exchanger 3-2.

  In subsequent STEP 3, the controller 20 determines whether or not the hot water temperature Th from the heating heat exchanger 3-2 detected by the hot water temperature sensor 93 is equal to or lower than the small range UP temperature (for example, 75 ° C.).

  When the hot water temperature Th is equal to or lower than the small range UP temperature, the process proceeds to STEP 4 and the controller 20 starts a small range UP timer (for example, the timer time is set to 4 seconds). In the subsequent loop of STEP5 to STEP6, the controller 20 proceeds to STEP7 in FIG. 4 when the state in which the tapping temperature Th is equal to or lower than the small range UP temperature in STEP5 continues until the small range UP timer expires in STEP6. .

  On the other hand, when the hot water temperature Th from the heating heat exchanger 3-2 is higher than the small range UP temperature in STEP3 or STEP5, the process branches to STEP3, and the controller 20 performs the heating burner 4 in the “small combustion range”. -2 combustion is maintained.

  Here, the controller 20 repeatedly executes the heating / extinguishing determination process in STEP20 to STEP25 during the heating operation. In STEP 20, the controller 20 determines whether or not the hot water temperature Th from the heating heat exchanger 3-2 is equal to or higher than a fire extinguishing determination temperature (for example, set to 90 ° C.).

  Then, when the hot water temperature Th becomes equal to or higher than the fire extinguishing judgment temperature, the process proceeds to STEP 21 and the controller 20 starts the heating fire extinguishing timer. In the subsequent loop of STEP22 to STEP23, the controller 20 determines whether or not the heating / extinguishing timer expires in STEP23 before the tapping temperature Th becomes lower than the extinguishing determination temperature in STEP22.

  When the heating / extinguishing timer expires in STEP 23, that is, when the state in which the hot water temperature Th from the heating heat exchanger 3-2 is equal to or higher than the extinguishing determination temperature continues to some extent, the process proceeds to STEP 24, where the controller 20 sets the heating burner 4- Extinguish 2 In addition, when the heating burner 4-2 is extinguished in STEP 24, the controller 20 stops the heating operation process in the hot water supply-heating simultaneous operation in STEP1.

  In subsequent STEP 25, the controller 20 waits for the tapping temperature Th from the heating heat exchanger 3-2 to be equal to or lower than the heating combustion start temperature (for example, the set temperature (80 ° C.) − 10 ° C.), and then proceeds to STEP 1 for heating. Restart the driving process. Thereby, the combustion of the heating burner 4-2 is restarted as “the combustion range is small”.

  In STEP 7 of FIG. 4, the controller 20 sets the heating burner 4-2 to “combustion range” (heating capacity switching valve 44L: valve open, heating capacity switching valve 44S: valve closed), and in subsequent STEP 8, the heating heat exchanger It is determined whether or not the hot water temperature Th from 3-2 is equal to or lower than the middle range UP temperature (for example, 90 ° C.).

  In STEP 8, when the tapping temperature Th is equal to or lower than the middle range UP temperature, the process proceeds to STEP 9, and the controller 20 starts a middle range UP timer (for example, the timer time is set to 4 seconds). When the state in which the tapping temperature Th from the heating heat exchanger 3-2 is equal to or lower than the intermediate range UP temperature in STEP10 is continued until the intermediate range UP timer expires in STEP11, the loop of STEP10 to STEP11 continues to STEP12. move on.

  On the other hand, in STEP8 or STEP10, when the hot water temperature Th from the heating heat exchanger 3-2 is higher than the middle range UP temperature, the process branches to STEP30. In STEP 30, the controller 20 determines whether or not the tapping temperature Th is equal to or higher than the middle range DOWN temperature. When the hot water temperature Th is equal to or higher than the intermediate range DOWN temperature, the process proceeds to STEP 31 to start an intermediate range DOWN timer (for example, the timer time is set to 0.5 seconds), and the outgoing hot water temperature Th is set to the intermediate range DOWN. When it is lower than the temperature, it branches to STEP8.

  By the subsequent loop of STEP32 to STEP33, the controller 20 continues the state in which the hot water temperature Th from the heating heat exchanger 3-2 is equal to or higher than the intermediate range DOWN temperature in STEP32 until the intermediate range DOWN timer expires in STEP33. Sometimes, go to STEP34.

  In STEP 34, the controller 20 switches the combustion range of the heating burner 4-2 from “in the combustion range” to “small combustion range”, and proceeds to STEP 3 in FIG. Moreover, when the hot water temperature Th from the heating heat exchanger 3-2 becomes lower than the middle range DOWN temperature in STEP32, the process branches to STEP8.

  In STEP 12, the controller 20 sets the heating burner 4-2 to “large combustion range” (heating capacity switching valve 44L: valve opening, heating capacity switching valve 44S: valve opening). In subsequent STEP 13, the controller 20 determines whether or not the hot water temperature Th from the heating heat exchanger 3-2 is equal to or higher than the large range DOWN temperature (for example, 87 ° C.). When the tapping temperature Th is equal to or higher than the large range DOWN temperature, the process proceeds to STEP 14 and the controller 20 starts the large range DOWN timer.

  When the state in which the hot water temperature Th from the heating heat exchanger 3-2 is equal to or higher than the large range DOWN temperature in STEP 15 is continued until the large range DOWN timer expires in STEP 16, the loop of STEP 15 to STEP 16 continues. Proceed to As a result, the combustion range of the heating burner 4-2 is switched from “large combustion range” to “medium combustion range”. In STEP 13 or STEP 15, when the hot water temperature Th from the heating heat exchanger 3-2 is lower than the large range DOWN temperature, the process branches to STEP 13.

  In the present embodiment, the combustion range of the heating burner 4-2 is set to “small combustion range” when shifting from the single operation of the hot water supply operation to the simultaneous operation of the hot water supply operation and the heating operation by the processing of STEP2 in FIG. The combustion of the heating burner 4-2 is started, but the combustion range of the heating burner 4-2 is set to “in the combustion range” which is smaller than the “large combustion range” which is the maximum combustion range. The effect of the present invention can also be obtained when starting.

  In the present embodiment, the heat source device using hot water as the heating medium for heating is shown, but the present invention can also be applied to a heat source device using a heat medium other than hot water such as antifreeze. is there.

  2-1 ... Hot water supply combustion unit, 2-2 ... Heating combustion unit, 3-1 ... Hot water supply heat exchanger, 3-2 ... Heating heat exchanger, 4-1 ... Hot water supply burner, 4-2 ... Heating burner, 4- 1S, 4-1M, 4-1L ... Hot water supply burner block, 4-2S, 4-2L ... Heating burner block, 8a ... Water supply pipe, 8b ... Hot water supply pipe, 9 ... Heating circulation circuit, 10 ... Hot air heater, 11 ... floor heating panel, 20 ... controller, 25 ... remote control, 42 ... gas proportional valve, 43S, 43M, 43L ... hot water supply capacity switching valve, 44S, 44L ... heating capacity switching valve.

Claims (2)

A hot water heat exchanger connected to the hot water pipe and hot water pipe,
A hot water supply burner configured by a plurality of hot water supply burner blocks that divide the combustion range, and for heating the hot water supply heat exchanger;
A heating heat exchanger connected in the middle of the heating circulation circuit to which the heating terminal is connected;
A heating burner configured to include a plurality of heating burner blocks that divide a combustion range, and that heats the heating heat exchanger;
A gas opening degree change valve that is provided in a common fuel gas supply path for the hot water supply burner and the heating burner, and changes the opening degree of the fuel gas supply path;
A hot water supply capacity switching valve for switching the supply and shutoff of fuel gas from the fuel gas supply path to each hot water supply burner block for each hot water supply burner block;
A heating capacity switching valve that switches between supply and shutoff of fuel gas from the fuel gas supply path to each heating burner block for each heating burner block;
A hot water supply operation in which the hot water supply burner is burned and the water supplied from the water supply pipe is heated by the hot water supply heat exchanger and discharged to the hot water supply pipe, and the heating burner is burned and the heat flowing through the heating circulation circuit A heat source device comprising a controller for performing a heating operation for heating a medium by the heating heat exchanger,
The controller is
During the single operation of the hot water supply operation, the combustion amount of the hot water supply burner is controlled by the hot water supply capacity switching valve and the gas opening change valve so that the temperature of the hot water supplied from the hot water supply pipe becomes the target hot water supply temperature. And
During the single operation of the heating operation, the heating capacity switching valve and the gas opening change valve are used so that the temperature of the heat medium sent from the heating heat exchanger to the heating circulation circuit becomes a target heating supply temperature. Control the amount of combustion of the heating burner;
During the simultaneous operation of the hot water supply operation and the heating operation, the hot water supply burner is controlled by the hot water supply capacity switching valve and the gas opening change valve so that the temperature of the hot water supplied from the hot water supply pipe becomes the target hot water supply temperature. The amount of combustion is controlled, and the amount of combustion of the heating burner is controlled by the heating capacity switching valve so that the temperature of the heat medium sent from the heating heat exchanger to the heating circulation circuit approaches the target heating supply temperature And
When shifting from the hot water supply operation or the single operation of the heating operation to the simultaneous operation of the hot water supply operation and the heating operation, the combustion range of the heating burner is reduced from the maximum combustion range by the heating capacity switching valve. The heat source device starts combustion of the heating burner. The heat source device according to claim 1,
When the controller shifts from the hot water supply operation or the single operation of the heating operation to the simultaneous operation of the hot water supply operation and the heating operation, in the state where the combustion range of the heating burner is minimized by the heating capacity switching valve, Combustion of the heating burner is started, and then the heating capacity switching valve controls the heating burner so that the temperature of the heat medium supplied from the heating heat exchanger to the heating circulation circuit approaches the target heating supply temperature. A heat source device that controls a combustion amount.

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