JP6234387B2 - Heat source equipment - Google Patents

Description

  The present invention relates to a heat source device having a function of preventing freezing of a flowing water channel.

  2. Description of the Related Art Conventionally, in a heat source device (such as a hot water supply device or a hot water heating device) that heats water flowing through a flow channel, a configuration in which a heater that heats the flow channel is provided in order to prevent water in the flow channel from freezing. (For example, refer to Patent Document 1).

  In the heat source apparatus described in Patent Document 1, when the outside air temperature detected by the outside air temperature sensor becomes lower than 5 ° C, the heater is intermittently operated, and when the outside air temperature becomes lower than 0 ° C. The heater is operated continuously.

JP 2009-192150 A

  The inventor of the present application needs a heater in a forced supply and exhaust (FF) type heat source machine when the antifreeze heater is operated based on the outside air temperature detected by the outside air temperature sensor. It has been found that there is a tendency that wasteful energy is consumed by operating as described above.

  The present invention has been made in view of such a background, and an object of the present invention is to provide a forced supply / exhaust heat source device in which useless energy is suppressed from being consumed by a freeze prevention heater.

In order to achieve the above object, the heat source device of the present invention comprises:
In a housing having an air supply port and an exhaust port communicating with the outdoors,
Running water channel,
A heat exchanger provided in the middle of the water channel,
A burner for heating the heat exchanger;
An air supply / exhaust fan that supplies air sucked into the casing from the outside through the air supply port to the burner and exhausts combustion exhaust gas of the burner to the outdoors through the exhaust port; A heat source device installed in
An outside air temperature sensor for detecting the temperature of air flowing into the housing from the air supply port;
An indoor temperature sensor for detecting the temperature of the installation location of the heat source device;
A heater for heating the flow channel;
When the detected temperature of the outside air temperature sensor or the detected temperature of the indoor temperature sensor is equal to or lower than a first predetermined temperature, heating of the water flow channel by the heater is started, and then the detected temperature of the outside air temperature sensor and the When the detected temperature of the indoor temperature sensor becomes equal to or higher than a second predetermined temperature higher than the first predetermined temperature, an anti-freezing process for ending heating of the water flow channel by the heater is performed, and in the anti-freezing process, When the detected temperature of the indoor temperature sensor is equal to or higher than a third predetermined temperature higher than the second predetermined temperature, when the water supply and exhaust fan is operating when water flows through the flow channel, the heating amount of the heater And a control unit that reduces the amount of water flow when the supply / exhaust fan is stopped without water flowing through the flow channel.

  According to the present invention, the heat source device is installed indoors, and the housing communicates with the outdoors via the air supply port. Therefore, the inside of the housing is cooled by the outside air flowing in from the air supply port by the operation of the air supply / exhaust fan, but the degree of cooling varies depending on the temperature of the room where the heat source device is installed, If it is high to some extent, it becomes difficult for the inside of the housing to be cooled by outside air. In this way, when the inside of the housing is difficult to be cooled by outside air, the water in the water flow channel is more flowing when the water is flowing through the flow channel than when the water is not flowing. Freezing is unlikely to occur.

  Therefore, when the control unit performs the freeze prevention process, when the temperature detected by the indoor temperature sensor is equal to or higher than the third predetermined temperature and the inside of the housing is difficult to be cooled by outside air, When water is flowing through the channel and the supply / exhaust fan is operating, the heating amount of the heater is made smaller than when the supply / exhaust fan is stopped without water flowing through the channel. In this case, since the heating amount of the heater is set in accordance with the degree of cooling in the casing, it is possible to suppress wasted energy from being consumed by the heater.

  The heating amount of the heater in the anti-freezing process is set by ON / OFF control that adjusts the heating amount of the heater by changing the ratio of the operation time and the stop time of the heater in a predetermined control cycle. Heating amount is also included.

  Further, in the freeze prevention process, when the temperature detected by the indoor temperature sensor is lower than the third predetermined temperature, the control unit causes water to flow through the flow channel and the supply / exhaust fan operates. When heated, the heating amount of the heater is made larger than when the water supply / exhaust fan is stopped without water flowing through the flow channel.

  In this configuration, when the temperature detected by the indoor temperature sensor is lower than the third predetermined temperature, the inside of the housing is easily cooled by the outside air drawn in by the supply / exhaust fan. Therefore, when the control unit performs the freeze prevention process, when the temperature detected by the indoor temperature sensor is lower than the third predetermined temperature, water flows through the water flow path and the supply / exhaust fan When the is operating, the heating amount of the heater is set to be larger than that when the water supply / exhaust fan is stopped without water flowing through the flow channel. Thereby, freezing of the water in the flow channel can be prevented more reliably.

The block diagram of the heat-source apparatus of this embodiment. The flowchart of a freeze prevention process. Setting table of ON time and OFF time in the control cycle of the freeze prevention heater.

  An embodiment of a heat source device of the present invention will be described with reference to FIGS.

  Referring to FIG. 1, a heat source device 1 of the present embodiment includes a hot water supply operation for supplying hot water to a curan (not shown) provided in a bathroom, a reheating operation for heating hot water in a bathtub, and hot water. A hot water heating operation for circulating and supplying hot water to a heating terminal (floor heater, hot air heater, etc.) is executed.

  The heat source device 1 is installed indoors, and a can body 20 is placed in a casing 10 that communicates with the outside through an air supply cylinder 6 connected to an air supply port 5 and an exhaust cylinder 8 connected to an exhaust port 7. I have. The can body 20 includes a hot water supply / heating unit 30 for supplying hot water and a heating / heating unit 40 for heating and reheating.

  In the hot water supply heating unit 30, a hot water supply burner 33, a hot water supply first heat exchanger 31, and a hot water supply second heat exchanger 32 are arranged in this order from the bottom. The hot water supply first heat exchanger 31 recovers sensible heat from the combustion exhaust gas of the hot water supply burner 33, and the hot water supply second heat exchanger 32 recovers latent heat from the combustion exhaust gas of the hot water supply burner 33.

  The hot water supply first heat exchanger 31 is connected to the downstream side of the hot water supply second heat exchanger 32. Moreover, the hot water supply 2nd heat exchanger 32 is connected to the water supply path 90 connected to the water supply, and the hot water supply 1st heat exchanger 31 is connected to the hot water supply path 100 connected to a currant (not shown). With this configuration, water supplied from the water supply to the water supply channel 90 is heated by the hot water supply second heat exchanger 32 and the hot water supply first heat exchanger 31 and supplied to the hot water supply channel 100. Further, heaters 400 and 401 for preventing freezing are provided in the flowing water path connecting the hot water supply first heat exchanger 31 and the hot water supply second heat exchanger 32.

  A hot water supply fan 70 (corresponding to an air supply / exhaust fan of the present invention) is provided below the hot water supply burner 33, and outdoor air sucked into the housing 10 from the air supply port 5 by the operation of the hot water supply fan 70. Is supplied to the hot water supply burner 33 as combustion air, and the combustion exhaust gas of the hot water supply burner 33 is discharged from the exhaust port 7.

  The hot water supply burner 33 is composed of three burner blocks 33 a, 33 b, 33 c, and each burner block 33 a, 33 b, 33 c is connected to a hot water supply gas branch path 52 branched from the gas supply path 50. The gas supply path 50 is provided with an original electromagnetic valve 51 that opens and closes the gas supply path 50. The hot water supply gas branch path 52 includes a hot water supply gas proportional valve 53 that changes the opening degree of the hot water supply gas branch path 52, and a hot water supply switching valve 54a that individually switches between supply and shutoff of fuel gas to the burner blocks 33a, 33b, and 33c. 54b and 54c are provided.

  A hot water supply spark plug 34 for igniting the hot water supply burner 33 and a hot water supply frame rod 35 for detecting the combustion flame of the hot water supply burner 33 are provided in the vicinity of the flame outlet of the hot water supply burner 33. The hot water supply spark plug 34 is connected to an igniter 73 and generates a spark discharge when a high voltage is applied from the igniter 73.

  A hot water supply high limit switch 102 for detecting overheating of the hot water supply first heat exchanger 31 is provided in the vicinity of the inlet of the hot water supply first heat exchanger 31. The water supply channel 90 includes, in order from the upstream side, a water filter / drain plug 95, a water supply amount sensor 91 that detects the flow rate of water flowing through the water supply channel 90, a water amount servo 92 that changes the opening of the water supply channel 90, and a water supply A bypass servo 93 that changes the opening degree of the hot water supply bypass passage 105 that communicates the passage 90 and the hot water supply passage 100 is provided. Further, the water supply passage 90 is provided with heaters 402, 404, and 406 for preventing freezing.

  In the hot water supply path 100, the hot water supplied from the upstream side to the downstream side of the joining point of the heat exchange temperature sensor 101 for detecting the temperature of hot water discharged from the hot water supply first heat exchanger 31 and the hot water supply bypass path 105. A hot water temperature sensor 103 for detecting temperature, an overpressure relief valve 107, and a water hammer buffer valve 106 are provided. Furthermore, the hot water supply path 100 is provided with heaters 403 and 405 for preventing freezing.

  Moreover, a hot water filling passage 250 branched from the hot water supply passage 100 and communicated with a bath return passage 251 connected to a bathtub (not shown) is provided. The bath return path 251 constitutes a circulation circuit between the bathtub and the bath heat exchanger 221 together with the bath going path 252.

  The hot water passage 250 has, in order from the upstream side, a hot water electromagnetic valve 261 that opens and closes the hot water passage 250, a check valve 263 for preventing the back flow of hot water from the hot water passage 250 to the hot water supply passage 100, Hot water filling amount sensors 262 and 0 for detecting the flow rate of hot water supplied from the hot water supply passage 100 to the hot water filling passage 250 are provided. Further, the hot water filling path 250 is provided with a heater 407 for preventing freezing.

  The hot water path 252 includes a bath pump 224 for circulating hot water in the bathtub through the bath forward path 252 and the bath return path 251, a water level sensor 223 for detecting the water level in the bathtub, and the hot water path 252. The bath water flow switch 222 that detects that hot water of a predetermined flow rate or more is flowing in the bath, the heat exchanger 221 that heats the hot water flowing through the bath outlet 252, and the temperature of the hot water that flows out of the bath outlet 252 into the bathtub. A bathing temperature sensor 226 to be detected is provided.

  The bath return path 251 is provided with a bath return temperature sensor 225 that detects the temperature of hot water flowing from the bathtub into the bath return path 251. Further, the bath pump 224 is provided with a heater 408 for preventing freezing.

  Next, in the heating heating unit 40, a heating burner 43, a heating first heat exchanger 41, and a heating second heat exchanger 42 are arranged in order from the bottom. The heating first heat exchanger 41 recovers sensible heat from the combustion exhaust gas of the heating burner 43, and the heating second heat exchanger 42 recovers latent heat from the combustion exhaust gas of the heating burner 43.

  A heating fan 72 (corresponding to the air supply / exhaust fan of the present invention) is provided below the heating burner 43, and the air sucked into the housing 10 from the air supply port 5 by the operation of the heating fan 72 is heated. While being supplied to the burner 43, the combustion exhaust gas of the heating burner 43 is discharged from the exhaust port 7.

  The heating burner 43 includes two burner blocks 43 a and 43 b, and each burner block 43 a and 43 b is connected to a heating gas branch path 60 branched from the gas supply path 50. The heating gas branch path 60 includes a heating gas proportional valve 61 that changes the opening degree of the heating gas branch path 60 and heating switching valves 62a and 62b that individually switch between supply and shutoff of fuel gas to the burner blocks 43a and 43b. Is provided.

  A heating spark plug 44 for igniting the heating burner 43 and a heating frame rod 45 for detecting the combustion flame of the heating burner 43 are provided in the vicinity of the flame outlet of the heating burner 43. The heating spark plug 44 is connected to the igniter 73 and generates a spark discharge when a high voltage is applied from the igniter 73.

  The heating second heat exchanger 42 is arranged in the middle of the heating return path 200, and the heating first heat exchanger 41 is arranged in the middle of the heating outgoing path 210. The heating return path 200 and the heating outgoing path 210 communicate with each other through a systern 201.

  The heating outgoing path 210 is connected to a high-temperature heating terminal (hot air heating terminal or the like) via a connection part 210a on the downstream side of the heating first heat exchanger 41, and is branched on the upstream side of the heating first heat exchanger 41. It is connected to a low temperature heating terminal (floor heater or the like) via a thermal valve header 212 connected to an end of the low temperature branch 216. In addition, the heating return path 200 is connected to the high temperature heating terminal and the low temperature heating terminal via the end portion 200a.

  The heating outgoing path 210 includes a heating pump 211 for circulating hot water in the circulation circuit including the heating outgoing path 210 and the heating return path 200, and heating for detecting the temperature of hot water supplied from the systern 201 to the low temperature branch 216. A low temperature sensor 215, a heating high limit switch 214 for detecting overheating of the heating first heat exchanger 41, and a heating high temperature sensor 213 for detecting the temperature of hot water discharged from the heating first heat exchanger 41 are provided. Yes.

  A bath heat exchanger 221 is provided in the middle of the bath branch path 240 branched from the heating outbound path 210. In the bath heat exchanger 221, heat exchange (liquid-liquid heat exchange) is performed between the hot water flowing in the bath going path 252 and the hot water flowing in the bath branching path 240, and flows in the bath going path 252. The hot water is heated. The bath branch path 240 is provided with an additional flow control valve 220 that changes the opening degree of the bath branch path 240.

  The low temperature adjustment branch 230 branched from the heating outbound path 210 is provided with a low temperature capability switching valve 232 that opens and closes the low temperature adjustment branch 230 and a low temperature capability bypass 231 that bypasses the low temperature capability switching valve 232.

  In the replenishment water channel 204 that connects the systern 201 and the water supply channel 90, a replenishment water electromagnetic valve 203 that opens and closes the replenishment water channel 204 is provided. The cistern 201 is provided with a water level electrode 202 for detecting the water level in the cistern 201. Further, the replenishment water channel 204 is provided with a heater 409 for preventing freezing.

  Under the hot water supply second heat exchanger 32 and the heating second heat exchanger 42, a drain receiver 80 for receiving the drain generated and dripped in the hot water supply second heat exchanger 32 and the heating second heat exchanger 42. Is provided. The drain dropped on the drain receiver 80 is collected by the neutralizer 82 via the drain pipe 81. The drain collected in the neutralizer 82 is discharged through the drain drain pipe 84 after being neutralized. The neutralizer 82 is provided with a neutralizer water level sensor 83 that detects the water level of the neutralized drain, and when the neutralized drain has accumulated to some extent, the drain is discharged by a pump (not shown). .

  An outdoor air temperature sensor 11 for detecting the temperature of air (outside air) flowing from the outside through the supply cylinder 6 is provided in the vicinity of the air supply port 5, and a hot water supply burner 33 and a heating burner are provided in the vicinity of the exhaust port 7. A CO sensor 85 for detecting the CO concentration in the combustion exhaust gas 43 is provided. An indoor temperature sensor 12 is provided at the bottom of the housing 10. The indoor temperature sensor 12 detects the indoor temperature (atmosphere temperature of the installation location) where the heat source device 1 is installed.

  The controller 300 (including the function of the control unit of the present invention) is an electronic circuit unit including a CPU, a memory, an interface circuit, and the like (not shown), and the CPU executes a control program for the heat source device 1 held in the memory. By doing so, the overall operation of the heat source device 1 is controlled.

  The controller 300 combusts the hot water supply burner 33 when the water supply channel 90 is supplied with water that is equal to or higher than the lower limit threshold value, and converts the water supplied from the water supply channel into the hot water supply first heat exchanger 31 and the hot water supply second heat exchange. The hot water supply operation which is heated by the water heater 32 and supplied from the hot water supply path 100, and the hot water solenoid valve 261 is opened to burn the hot water supply burner 33, so that the water supplied to the water supply path 90 is heated in the first heat exchange. A hot water filling operation is performed in which the water is heated by the water heater 31 and the hot water supply second heat exchanger 32 and is supplied to the bathtub via the hot water supply passage 100 and the hot water filling passage 250.

  In addition, the controller 300 operates the heating pump 211 and burns the heating burner 43, thereby heating the heating terminal to circulate hot water to the heating terminal via the heating forward path 210 and the heating return path 200, and the heating pump 211. In addition, the bath pump 224 is operated, and the heating burner 43 is combusted to perform a reheating operation in which hot water in the bathtub is heated by the bath heat exchanger 221.

  A remote controller 301 is connected to the controller 300, and the user operates the remote controller to operate hot water supply temperature in hot water supply operation, hot water temperature in hot water operation, heating temperature in heating operation, additional temperature in additional operation, etc. Can be set.

  The controller 300 includes an outside air temperature sensor 11, an indoor temperature sensor 12, a hot water supply frame rod 35, a heating frame rod 45, a neutralizer water level sensor 83, a CO sensor 85, a water supply water amount sensor 91, a heat exchanger temperature sensor 101, a hot water supply high limit. Switch 102, tapping temperature sensor 103, water level electrode 202, heating high temperature sensor 213, heating high limit switch 214, heating low temperature sensor 215, bath water flow switch 222, water level sensor 223, bath return temperature sensor 225, bathing temperature sensor 226 , And a detection signal from the hot water sensor 262 and an operation signal from the remote controller 301 are input.

  Further, according to the control signal output from the controller 300, the original solenoid valve 51, the hot water supply gas proportional valve 53, the hot water supply switching valves 54a, 54b, 54c, the heating gas proportional valve 61, the heating switching valves 62a, 62b, the hot water supply fan 70, heating A fan 72, an igniter 73, a water volume servo 92, a bypass servo 93, a hot water solenoid valve 261, a heating pump 211, a reheating flow rate control valve 220, a low temperature capability switching valve 232, a makeup water electromagnetic valve 203, a thermal valve header 212, and The operation of the heaters 400 to 409 and the operation of the notification unit (display unit, sound output unit) of the remote controller 301 are controlled.

  The controller 300 supplies hot water from the hot water supply path 100 by burning the hot water supply burner 33 when the user has opened a currant or the like and the flow rate equal to or higher than a predetermined lower limit flow rate is detected by the feed water amount sensor 91. operation). In the hot water supply operation, the controller 300 controls the operation of the hot water supply switching valves 54a, 54b, 54c and the hot water supply gas proportional valve 53 so that the temperature detected by the hot water temperature sensor 103 becomes the target hot water temperature set by the remote controller 301. Then, the combustion amount of the hot water supply burner 33 is adjusted.

  When the remote control 301 instructs the execution of the hot water filling operation, the controller 300 opens the hot water filling electromagnetic valve 261. As a result, water supply from the water supply to the water supply channel 90 is started, and the controller 300 adjusts the amount of combustion of the hot water supply burner 33 in the same manner as in the hot water supply operation, so that the hot water supply channel 250, the hot water supply channel 252 and the bath access channel 252 and bath are adjusted. Hot water is supplied to the bathtub via the return path 251.

  The controller 300 integrates the flow rate detected by the hot water level sensor 262 to integrate the hot water level in the bathtub, and when the integrated value reaches the hot water level corresponding to the target hot water level set by the remote controller 301, The tension solenoid valve 261 is closed, the combustion of the hot water supply burner 33 is stopped, and the hot water tension operation is terminated.

  When the remote controller 301 instructs the start of the chasing operation, the controller 300 operates the bath pump 224. When the bath water flow switch 222 is turned on and it is detected that hot water is stored in the bathtub, the controller 300 burns the heating burner 43 and activates the heating pump 211. Thereby, hot water in the bathtub circulating through the bath going-out path 252 and the bath return path 251 is heated by the bath heat exchanger 221.

  When the start of the heating operation is instructed by the remote controller 301, the controller 300 operates the heating pump 211 and burns the heating burner 43. Thereby, the hot water heated by the heating 1st heat exchanger 41 and the heating 2nd heat exchanger 42 is supplied to a warm water heating terminal via the heating going path 210 and the heating return path 200.

  In the heating operation, the controller 300 adjusts the combustion amount of the heating burner 43 according to the detected temperatures of the heating high temperature sensor 213 and the heating low temperature sensor 215.

  Next, the antifreezing operation process executed by the controller 300 will be described according to the flowchart shown in FIG. The controller 300 repeatedly executes the process (freezing prevention process) according to the flowchart shown in FIG. 2 during operation.

  In STEP 1, the controller 300 determines whether the detected temperature of the outside air temperature sensor 11 or the detected temperature of the indoor temperature sensor 12 is 3 ° C. (corresponding to the first predetermined temperature of the present invention) or less. And when the detection temperature of the outside temperature sensor 11 or the detection temperature of the indoor temperature sensor 12 is 3 degrees C or less, it progresses to STEP2.

  On the other hand, when both the detected temperature of the outside air temperature sensor 11 and the detected temperature of the indoor temperature sensor 12 are higher than 3 ° C., it can be determined that it is not necessary to operate the heaters 400 to 409 to prevent freezing. .

  In STEP 2, the controller 300 starts heating control of the antifreezing heaters 400 to 409. Using the tables A to D shown in FIGS. 3A and 3B, the controller 300 supplies the heating amount of the heaters 400 to 409 to the ON time in the control cycle of 30 minutes (the heaters 400 to 409 are energized). The time is controlled by changing the ratio of the OFF time (the time to cut off the energization of the heaters 400 to 409). As the detected temperature Th in the tables A to D, the lower one of the detected temperature of the outside air temperature sensor 11 and the detected temperature of the indoor temperature sensor 12 is applied.

  In STEP 3, the controller 300 determines whether or not the temperature detected by the indoor temperature sensor 12 is 10 ° C. (corresponding to the third predetermined temperature of the present invention) or higher. Note that the detected temperature of the indoor temperature sensor 12 does not become lower than the detected temperature of the outside air temperature sensor 11.

  When the detected temperature of the indoor temperature sensor 12 is not 10 ° C. or higher (when it is lower than 10 ° C.), the process branches to STEP 30. In STEP 30, the controller 300 determines the ON time (energization time) and OFF time (energization cut-off time) in the control period of 30 minutes for the heaters 400 to 409 (electric heater) according to the setting table D shown in FIG. (Hereinafter referred to as ON / OFF time), and the process proceeds to STEP6.

  The table D has a structure in which the temperature of the place where the heat source device 1 is installed is low, and water flows through a flowing water channel (a water supply channel 90, a hot water supply channel 100, a heating return channel 200, a heating forward channel 210, etc.). This is a setting table for a case where there is a high possibility that water in the inside will be frozen.

  In Table D, when the burner is burned (when one or both of the hot water supply burner 33 and the heating burner 43 is burning) and when the burner combustion is stopped (when both the hot water supply burner 33 and the heating burner 43 are stopped burning) ) And changing the ON / OFF time of the heaters 400 to 409.

  This is because during burner combustion, the operation of one or both of the hot water supply fan 70 and the heating fan 72 facilitates the inflow of outside air from the air supply port 5 and the temperature in the housing 10 is likely to decrease. .

  Table D is set to increase the heating amount of the heaters 400 to 409 by increasing the proportion of the ON time as the detected temperature Th decreases when the detected temperature Th is lower than 2 ° C. when the burner combustion is stopped. Yes.

  On the other hand, at the time of burner combustion, when the detected temperature Th is lower than −2 ° C., the table D assumes that the ON time ratio is 100% (ON time: 30 minutes, OFF time: 0 minutes) 409 is set to operate continuously. Thereby, the table D is set to increase the heating amount of the heaters 400 to 409 at the time of burner combustion more than at the time of burner combustion stop.

  Next, when the detected temperature of the indoor temperature sensor 12 is higher than 10 ° C. in STEP 3, the process proceeds to STEP 4. The controller 300 determines whether or not the heating pump 211 is in operation in STEP 4, proceeds to STEP 5 when the heating pump 211 is operating, and branches to STEP 10 when the heating pump 211 is stopped.

  In STEP 5, the controller 300 sets the ON / OFF time of the heaters 400 to 409 according to the detected temperature Th according to the table A shown in FIG. 3A, and proceeds to the next STEP 6.

  In STEP 10, the controller 300 determines whether or not the water supply amount sensor 91 is ON (a state where the detected flow rate of the water supply water amount sensor 91 is equal to or greater than the lower limit threshold value). Here, the controller 300 performs a hot water supply operation or a hot water filling operation by burning the hot water supply burner 33 when the water supply water amount sensor 91 is ON.

  When the feed water amount sensor 91 is ON in STEP 10, the process proceeds to STEP 11, and the controller 300 sets the ON / OFF time of the heaters 400 to 409 according to the detected temperature Th according to the table B shown in FIG. Set and proceed to STEP6.

  On the other hand, when the feed water amount sensor 91 is not ON in STEP 10, the process branches to STEP 20, and the controller 300 turns ON / OFF the heaters 400 to 409 according to the detected temperature Th according to the table C shown in FIG. Set the time and go to STEP6.

  Referring to FIG. 3A, Tables A to C are ON / OFF targets when the temperature detected by the indoor temperature sensor 12 is 10 ° C. or higher and the possibility that the water in the flowing water channel is frozen is low. It is a setting table of OFF time. Table A is a setting table for the case where the heating pump 211 is in operation, and Table B is a setting for the case where the water supply amount sensor 91 is ON (a flow rate equal to or higher than the lower limit threshold is detected). Table C is a setting table for the case where the heating pump 211 is stopped and the water supply amount sensor 91 is not ON.

  When the heating pump 211 is in operation, since hot water is flowing through the flowing water channel on the heating heating unit 40 side such as the heating outbound channel 210 and the heating return channel 200, the water in the flowing channel is unlikely to freeze. . Therefore, in Table A, the heaters 400 to 409 are not operated until the detected temperature Th becomes lower than −12 ° C. When the detected temperature Th becomes lower than −12 ° C., the lower the detected temperature Th, the longer the ON time. Is set to activate the heaters 400 to 409.

  In addition, when the water supply amount sensor 91 is ON, since hot water is flowing in the water flow path on the hot water supply heating unit 30 side such as the water supply path 90 and the hot water supply path 100, the water in the flow path is frozen. hard. Therefore, in Table B, the heaters 400 to 409 are not operated until the detected temperature Th becomes lower than −2 ° C., and when the detected temperature Th becomes lower than −2 ° C., the ON time increases as the detected temperature decreases. Is set to activate the heaters 400 to 409.

  On the other hand, when the heating pump 211 is not operated and the water supply amount sensor 91 is not ON, since hot water is not flowing through any flow channel, water in the flow channel is likely to freeze. . Therefore, in Table C, the heaters 400 to 409 are operated from the stage where the detected temperature Th is lower than 7 ° C., and the heaters 400 to 409 are operated by increasing the ON time ratio as the detected temperature Th decreases. It is set.

  Comparing Table D with Tables A and B, during burner combustion (basically, the heating burner 43 burns while the heating pump 211 is operating, and the hot water supply burner 33 is turned on when the feed water amount sensor 91 is ON. In Table D, the ON / OFF time of the heaters 400 to 409 is set to 5 minutes from the stage when the detected temperature Th is lower than 7 ° C., and heating by the heaters 400 to 409 is started. It is set to be.

  On the other hand, in Table A (corresponding when the heating burner 43 burns), the ON time is set to 5 minutes from the stage when the detected temperature Th becomes lower than −12. In Table B (corresponding to the combustion of the hot water supply burner 33), the ON time is set to 5 minutes from the stage when the detected temperature Th becomes lower than −2 ° C., and heating by the heaters 400 to 409 is started. It has become.

  Specifications in which the tables A, B, and D are set as described above, and the heating amount of the heaters 400 to 409 is increased as the detected temperature of the indoor temperature sensor 12 is lower in accordance with the detected temperature of the indoor temperature sensor 12 determined in STEP 3. By doing so, it is possible to prevent unnecessary electric power from being consumed by heating by the heaters 400 to 409 in a situation where it is not necessary to prevent freezing.

  The controller 300 sets the ON / OFF time of the heaters 400 to 409 by any one of STEP 5, STEP 11, STEP 20, and STEP 30, and then proceeds to STEP 6 to detect the detected temperature of the outside air temperature sensor 11 or the indoor temperature sensor 12. It is determined whether or not the detected temperature is equal to or higher than 7 ° C. (corresponding to the second predetermined temperature of the present invention).

  When the detected temperature of the outside temperature sensor 11 and the detected temperature of the indoor temperature sensor 12 are 7 ° C. or higher, the process proceeds to STEP 7, and the controller 300 ends the heating control of the heaters 400 to 409 and returns to STEP 1. On the other hand, when both the detected temperature of the outdoor temperature sensor 11 and the detected temperature of the indoor temperature sensor 12 are lower than 7 ° C., the process returns to STEP 3 and the controller 300 continues the heating control of the heaters 400 to 409.

  In addition, in this embodiment, although the composite-type heat source device 1 provided with the hot water supply heating part 30 and the heating heating part 40 was shown, with respect to the single-function type heat source device provided only with the hot water supply function or only the heating function. However, the present invention can be applied.

  In the present embodiment, the heating amount of the heater is controlled by changing the ratio of the heater ON time and the OFF time in a predetermined control cycle. However, by changing the energization amount when the heater is energized continuously. The heating amount of the heater may be controlled.

  DESCRIPTION OF SYMBOLS 1 ... Heat source apparatus, 10 ... Housing | casing, 11 ... Outside temperature sensor, 12 ... Indoor temperature sensor, 30 ... Hot water supply heating part, 31 ... Hot water supply 1st heat exchanger, 32 ... Hot water supply 2nd heat exchanger, 33 ... Hot water supply burner , 40 ... heating heating unit, 41 ... heating first heat exchanger, 42 ... heating second heat exchanger, 43 ... heating burner, 70 ... hot water supply fan, 72 ... heating fan, 90 ... water supply channel (flow channel), 100 ... hot water supply path (flowing water path), 200 ... heating return path (flowing water path), 210 ... heating forward path (flowing water path), 300 ... controller (control unit).

Claims (2)

In a housing having an air supply port and an exhaust port communicating with the outdoors,
Running water channel,
A heat exchanger provided in the middle of the water channel,
A burner for heating the heat exchanger;
An air supply / exhaust fan that supplies air sucked into the casing from the outside through the air supply port to the burner and exhausts combustion exhaust gas of the burner to the outdoors through the exhaust port; A heat source device installed in
An outside air temperature sensor for detecting the temperature of air flowing into the housing from the air supply port;
An indoor temperature sensor for detecting the temperature of the installation location of the heat source device;
A heater for heating the flow channel;
When the detected temperature of the outside air temperature sensor or the detected temperature of the indoor temperature sensor is equal to or lower than a first predetermined temperature, heating of the water flow channel by the heater is started, and then the detected temperature of the outside air temperature sensor and the When the detected temperature of the indoor temperature sensor becomes equal to or higher than a second predetermined temperature higher than the first predetermined temperature, an anti-freezing process for ending heating of the water flow channel by the heater is performed, and in the anti-freezing process, When the detected temperature of the indoor temperature sensor is equal to or higher than a third predetermined temperature higher than the second predetermined temperature, when the water supply and exhaust fan is operating when water flows through the flow channel, the heating amount of the heater A heat source device, comprising: a control unit that reduces the flow rate of the water supply / exhaust fan when the water supply / exhaust fan is stopped without water flowing through the flow channel. The heat source device according to claim 1,
In the anti-freezing process, when the temperature detected by the indoor temperature sensor is lower than the third predetermined temperature, the control unit is configured to operate when the water supply / exhaust fan is operating when water flows through the flow channel. The heat source device is characterized in that the heating amount of the heater is made larger than when the supply / exhaust fan is stopped without water flowing through the flow channel.