JP2018185093A - Hot water supplying and heating heat source machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attain deterioration suppression in a location to be heated by a heater and power saving while presenting an appropriate freezing prevention performance in a hot water supplying and heating heat source machine comprising a freezing prevention function.SOLUTION: The hot water supplying and heating heat source machine comprises: heaters 71-78 and 81-86 for heating a hot water circulation passage inside of a housing 10 for each predetermined location; an outside temperature sensor 68; and heater control means which actuates the heaters 71-78 and 81-86 in a case where a detected temperature of the outside temperature sensor 68 becomes lower than a reference temperature. The heaters 71-78 and 81-86 are configured in an operation controllable manner while being divided into a first group of heaters 71-78 disposed in a main channel of the hot water circulation passage and a second group of heaters 81-86 disposed in a sub channel of the hot water circulation passage. In the case where the detected temperature of the outside temperature sensor 68 becomes lower than the reference, in each of a hot water supply operation, a heating operation and an operation standby state,the heater control means actuates the first group of the heaters 71-78 and the second group of the heaters 81-86 while making a heating degree different therebetween.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a hot water supply / heating heat source device, and more particularly, to a hot water supply / heating heat source device having a function of preventing freezing of a hot water distribution path by heating.

  Conventionally, in a hot water supply / heating heat source machine that has both a hot water supply function and a heating function, a plurality of heaters for heating a hot water flow path constituted by a heat exchanger, a water inlet pipe, a hot water outlet pipe, etc. It has a supply air temperature sensor that detects the temperature of the air that is taken in (supply air temperature) and an ambient temperature sensor that detects the ambient temperature in the housing, and the detected temperature of either the supply air temperature sensor or the ambient temperature sensor is There has been known one configured to operate each heater to prevent freezing of hot water in the hot water circulation path when the temperature becomes lower than a predetermined temperature (for example, see Patent Document 1).

Japanese Patent Application Laid-Open No. 2006-133252

  However, in the above-described conventional hot water supply / heating heat source machine, since the heaters are configured to be collectively controlled when heating the hot water distribution path with the heaters, for example, a place where it is difficult to lower the temperature during operation, that is, Even a portion that does not require much heating is heated all at once based on other low-temperature portions. Therefore, there is a problem of consuming more power than necessary. In addition, the heat exchanger, which is the main flow path of the hot water distribution path, and the parts other than the upstream and downstream areas (sub-flow paths), such as a packing member and a resin case for preventing water leakage, are likely to deteriorate if they are heated for a long time. Since many are arranged, if the sub-flow path is heated to the same level as the main flow path as described above, there is a possibility that the deterioration of each member is accelerated.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a hot water supply / heating heat source machine having a function of preventing freezing of the hot water distribution path by heating while saving appropriate freezing prevention performance. The purpose is to suppress power generation and deterioration of the heated portion by the heater.

  The present invention relates to a burner that burns fuel gas, a supply / exhaust fan that supplies combustion air for the burner from the outside of the housing, a heat exchanger that recovers heat in combustion exhaust gas generated by the burner and heats hot water , A water inlet line for introducing hot water into the heat exchanger, a hot water outlet line for extracting hot water from the heat exchanger, and a hot water flow path inside the housing including the heat exchanger, the incoming water line and the outgoing hot water line. A plurality of heaters that heat each time, an outside air temperature sensor that detects the temperature of the outside air introduced into the housing, and a hot water flow path that operates the heater when the temperature detected by the outside air temperature sensor becomes lower than the reference temperature The heater control means for heating the hot water, the hot water supply operation means for supplying hot water heated by the heat exchanger to the external hot water tap, and the heating operation for circulating the hot water heated by the heat exchanger to the external heating terminal And hot water supply A heat source device, wherein the heater includes a heat exchanger in the hot water distribution path and a first heater group disposed in a main flow path including upper and lower predetermined flow areas, and a sub flow path excluding the main flow path in the hot water flow path. The heater control means is configured to be capable of controlling the operation separately from the second heater group disposed in the heater. The heater control means has a temperature detected by the outside air temperature sensor lower than the reference temperature in each of the hot water supply operation, the heating operation, and the operation standby state. In this case, the heaters are operated with different degrees of heating between the first heater group and the second heater group.

  According to the present invention, when the detected temperature of the outside air temperature sensor becomes lower than the reference temperature, the heat exchanger and its upstream / downstream area (main flow path) in the hot water distribution path and the other locations (sub Since the heating is performed at a different degree of heating from the flow path), each part can be optimally heated for each operation state, and unnecessary power consumption can be reduced. In addition, by making the heating degree of the main flow path different from the heating degree of the sub flow path, deterioration due to heating of the members disposed in the sub flow path can be suppressed.

  Preferably, in the hot water supply / heating heat source machine, the heater control means adjusts the degree of heating in the first heater group when the temperature detected by the outside air temperature sensor is lower than the reference temperature during the heating operation and the hot water supply operation is stopped. The heater is operated by setting it to be larger than the heating degree in the second heater group.

  In this type of hot water supply / heating heat source machine, for example, when a heating operation is performed, not only to the arrangement part of the heat exchanger on the heating side, but also to the arrangement part of the heat exchanger on the hot water supply side. Air outside the body (outside air) may be introduced by a supply / exhaust fan. In such a case, in the cold season, the temperature of the hot water supply side heat exchanger and the hot water distribution path in the vicinity of the upstream and downstream ends thereof may be lower than that during operation standby and may cause freezing. In particular, since the heat exchanger is configured to have higher heat exchange efficiency than other hot water distribution channels, it is more likely to freeze when cold air flows into the periphery. However, according to the present invention, when the detected temperature of the outside air temperature sensor becomes lower than the reference temperature during the heating operation and the hot water supply operation stop, the heat exchanger of the hot water flow path and the upstream and downstream areas (main flow paths) Since the degree of heating is set larger than the degree of heating at other locations (sub-channels), the main channel can be more reliably prevented from freezing than when the main channel is heated at a high temperature for a short time. Moreover, by making the heating degree of the sub-flow path smaller than the heating degree of the main flow path, it is possible to reduce unnecessary power consumption, and to suppress deterioration due to heating of the members disposed in the sub-flow path. You can also

  Preferably, in the hot water supply / heating heat source machine, when the detected temperature becomes lower than a reference temperature, the operation timings of the first heater group and the second heater group are made different by a predetermined time.

  In the hot water supply / heating heat source device configured to heat the hot water flow path with a plurality of heaters, a relatively large amount of electric power is required to operate all the heaters. Therefore, if all the heaters are operated at the same timing, the peak current at that time becomes large, and there is a possibility that the heater does not operate properly in an environment where the supplied power is limited to a certain level or less. However, according to the present invention, since the first heater group and the second heater group are operated at a timing shifted by a predetermined time, the peak current when each heater is operated can be suppressed. Therefore, even in an environment where the supplied power is limited to a certain level or less, the operation stability can be ensured.

  As described above, according to the present invention, it is possible to reduce the power consumption of the entire heat source machine while exhibiting appropriate anti-freezing performance, and it is also possible to suppress the deterioration of the heating location by the heater.

FIG. 1 is a schematic configuration diagram of a hot water supply / heating heat source machine according to an embodiment of the present invention. FIG. 2 is a diagram showing a heating setting table of the hot water supply / heating heat source machine according to the embodiment of the present invention. FIG. 3 is an operation flowchart of the heater of the hot water supply / heating heat source unit according to the embodiment of the present invention. FIG. 4 is a graph showing the operation timing of the heater of the hot water supply / heating heat source machine according to another embodiment of the present invention.

  Next, embodiments for carrying out the present invention will be described in detail with reference to the accompanying drawings.

  As shown in FIG. 1, a hot water supply / heating heat source unit 1 according to an embodiment of the present invention heats water supplied from a water supply and supplies it to a hot water tap P2 such as a currant or shower ( Hereinafter, it is referred to as a “hot water supply heat source unit”) 2 and a heating source heat source unit that heats and circulates hot water between the heating terminal P3 such as a hot water fan heater or a hot water floor heater (hereinafter referred to as a “heating heat source unit”). 3 is a composite heat source unit that is configured integrally with the unit 3, and is mainly used by being installed outdoors. The hot water supply / heating heat source unit 1 also includes a heat exchanger (hereinafter referred to as “bath heat exchanger”) 4 for a chasing operation for heating and circulating bath water to and from the bathtub P4.

  The hot water supply heat source unit 2 includes a hot water supply heat exchanger 21 that heats water supplied from a water supply pipe (water supply pipe line) 121 by heat exchange with combustion exhaust gas, and a mixed gas of fuel gas and air supplied from a gas pipe 111. And a hot water burner 22 for burning the gas. The heating heat source unit 3 includes a heating heat exchanger 31 that heats hot water returning from the heating terminal P3 via a heating return pipe (water supply pipe line) 131 by heat exchange with combustion exhaust gas, and fuel supplied from the gas pipe 111. A heating burner 32 for burning a mixed gas of gas and air is provided.

  The can 11 constituting the common shell of the hot water supply heat exchanger 21 and the heating heat exchanger 31 is formed in a substantially cylindrical shape that opens up and down. Combustion chamber 12 constituting a common shell of hot water supply burner 22 and heating burner 32 is formed in a substantially box shape that opens upward, and is connected to the lower end opening of can 11. A supply / exhaust fan 15 for supplying combustion air from the hot water supply burner 22 and the heating burner 32 into the combustion chamber 12 is connected to the lower portion of the combustion chamber 12.

  The internal space of the can 11 heats the combustion exhaust gas generated by the hot water supply burner 22 and the exhaust gas flow passage on the hot water supply side that guides the combustion exhaust gas generated by the hot water supply burner 22 to the installation portion of the hot water supply heat exchanger 21 and the heating exhaust gas. Two passages are formed with an exhaust flow passage on the heating side leading to the arrangement portion of the vessel 31, and the air introduced into the combustion chamber 12 by the air supply / exhaust fan 15 passes through both the exhaust flow passages. It is guided to the upper end opening of the can 11.

  When the latent heat is recovered by the hot water supply heat exchanger 21 and the heating heat exchanger 31, the can 11 is generated on the surfaces of the hot water supply side latent heat heat exchange unit 21B and the heating side latent heat heat exchange unit 31B described later. A drain receiver 16 is provided for receiving a strongly acidic drain. A drain outlet pipe 161 for guiding the drain to the drain neutralizer 17 is connected to the bottom of the drain receiver 16. Although not shown, the drain neutralizer 17 is filled with a drain neutralizer, and the drain recovered in the drain neutralizer 17 through the drain outlet pipe 161 is neutralized by the drain neutralizer. . The drain neutralizer 17 is connected to a drain pump 37 for forcibly discharging the drain neutralized water collected in the drain neutralizer 17 to the outside. Further, the drain neutralizer 17 is connected to the overflow pipe 163 through the neutralization water outlet pipe 162, and when the drain pump 37 does not operate normally, the neutralized water staying in the drain neutralizer 17 is neutralized. The water is discharged from the water outlet 162 through the overflow pipe 163 to the outside.

  The casing 10 constituting the outline of the hot water supply / heating heat source machine 1 includes an air supply port 101 for taking outdoor air (outside air) into the casing 10 when the supply / exhaust fan 15 is operated, and a combustion chamber. 12 is provided with an exhaust port 102 for leading the combustion exhaust gas generated inside 12 to the outside of the housing 10. The upper end open part of the can 11 communicates with the exhaust port 102.

  The hot water supply heat exchanger 21 includes a sensible heat exchange section (hereinafter referred to as a “hot water supply side sensible heat exchange section”) 21A that collects sensible heat in the combustion exhaust gas discharged from the hot water burner 22, and the combustion exhaust gas in the combustion exhaust gas. And a latent heat exchange unit (hereinafter referred to as “hot water supply side latent heat exchange unit”) 21B for recovering latent heat, and a water supply pipe 121 is connected to the upstream end of the hot water supply side latent heat exchange unit 21B. The downstream end of the heat exchanging part 21B and the upstream end of the hot water supply side sensible heat exchanging part 21A are connected by a connecting pipe 123, and a hot water supply pipe (outlet pipe line) 122 is connected to the downstream end of the hot water supply side sensible heat exchanging part 21A. Is done. Therefore, when the hot water tap P2 is opened, the water introduced into the water supply pipe 121 from the water supply flows in the order of the hot water supply side latent heat exchange unit 21B and the hot water supply side sensible heat exchange unit 21A, and passes through the hot water supply pipe 122. Derived to P2.

  The heating heat exchanger 31 includes a sensible heat exchange unit (hereinafter referred to as a “heating-side sensible heat exchange unit”) 31A that collects sensible heat in the combustion exhaust gas discharged from the heating burner 32, and the combustion exhaust gas in the combustion exhaust gas. A latent heat exchanger (hereinafter referred to as a “heating-side latent heat exchanger”) 31B that collects latent heat, and a heating return pipe 131 is connected to the upstream end of the heating-side latent heat exchanger 31B. A heating outlet pipe (tapping pipe) 132 is connected to the downstream end of the sensible heat exchange section 31A.

  The downstream end of the heating-side latent heat exchange unit 31B and the upstream end of the heating-side sensible heat exchange unit 31A are connected to the heating-side hot water flow constituted by the heating heat exchanger 31, the heating return pipe 131, the heating forward pipe 132, and the like. The passage is connected by a communication forward pipe 133 and a communication return pipe 134 with a cistern 33 for absorbing volume expansion accompanying a rise in temperature of hot water in between. That is, the downstream end of the heating-side latent heat exchange unit 31B is connected to the cistern 33 through the communication forward pipe 133, and the upstream end of the heating-side sensible heat exchange unit 31A is connected to the cistern 33 through the connection return pipe 134. .

  The cistern 33 is connected to a water replenishing pipe 135 that branches from an intermediate portion of the water supply pipe 121 and replenishes water to the hot water flow path on the heating side. The connecting portion between the cistern 33 and the supplementary water pipe 135 is provided with a supplementary water electromagnetic valve 45 capable of shutting off the water supply from the water supply pipe 121 to the cistern 33. By opening the supplementary water electromagnetic valve 45, water is supplied from the water supply. The water introduced into the pipe 121 is introduced into the cistern 33 through the supplementary water pipe 135.

  The connection return pipe 134 is provided with a circulation pump 34 for circulating hot water between the heating terminal P3 and the heating heat exchanger 31. Further, the communication return pipe 134 branches from an intermediate portion on the downstream side of the circulation pump 34 and is connected to a thermal valve header 35 for connecting a low-temperature heating terminal P3. Therefore, by operating the circulation pump 34, the heating terminal P3 connected between the heating return pipe 131 and the heating forward pipe 132 is heated by the heating side sensible heat exchange unit 31A and the heating side latent heat exchange unit 31B. It is possible to circulate and supply high-temperature hot water. Moreover, the low temperature hot water heated by the heating side latent heat exchange part 31B can be circulated and supplied to the heating terminal P3 connected between the heating return pipe 131 and the thermal valve header 35.

  The bath heat exchanger 4 is a liquid heat exchanger having an inner and outer double pipe structure, a bath return pipe 141 is connected to the upstream end of the outer pipe 41, and a bath outlet pipe 142 is connected to the downstream end of the outer pipe 41. ing. The bath return pipe 141 is provided with a bath pump 36 for circulating bath water in the bathtub P4 between the bathtub P4 and the outer pipe 41. A heating forward pipe 143 branched from the middle part of the heating outgoing pipe 132 is connected to the upstream end of the inner pipe 42, and a heating return pipe 144 branched from the middle part of the heating return pipe 131 is connected to the downstream end of the inner pipe 42. Is connected. Therefore, if the bath pump 36 is operated, the bath water in the bathtub P4 is circulated between the outer pipe 41 while being heated by the hot water supplied from the heating-side sensible heat exchanger 31A to the inner pipe 42. be able to.

  The bath return pipe 141 and the hot water supply pipe 122 are connected to each other by a hot water filling bypass pipe 140 for supplying hot water heated by the hot water supply heat exchanger 21 to the bathtub P4. That is, the hot water supply pipe 122 is branched from the intermediate portion and connected to the bath return pipe 141. Therefore, if the hot water solenoid valve 53 described later is opened, the hot water heated by the hot water supply heat exchanger 21 can be guided from the hot water supply pipe 122 to the bypass pipe 140 and supplied to the bathtub P4 through the bath return pipe 141.

  A water amount sensor 51 that detects the flow rate of water supplied to the hot water supply heat exchanger 21 and a water amount adjustment valve 52 that can adjust the supply amount of water to the hot water supply heat exchanger 21 are provided in the water supply pipe 121 from the upstream side. They are provided in this order. A water supply temperature sensor 61 that detects the temperature of the water supplied to the hot water supply heat exchanger 21 is provided between the water amount sensor 51 and the water amount adjustment valve 52 in the water supply pipe 121.

  A can body temperature sensor 62 for detecting the temperature of hot water derived from the hot water supply side latent heat exchange section 21B is provided at a position near the upstream end of the hot water supply pipe 122, that is, a position near the outside of the can body 11. . A hot water supply temperature sensor 63 that detects the temperature of hot water led out from the hot water supply heat exchanger 21 to the hot water tap P2 is provided at a position near the downstream end of the hot water supply pipe 122.

  A low temperature heating temperature sensor 64 for detecting the temperature of hot water led out from the cistern 33 to the thermal valve header 35 is provided at a position near the upstream end of the connection return pipe 134, that is, a position near the outlet of the circulation pump 34. It has been. A high temperature heating temperature sensor 65 that detects the temperature of hot water led out from the heating side sensible heat exchanger 31A is provided at a position near the upstream end of the heating forward pipe 132, that is, a position near the outside of the can 11. ing.

  A bath return temperature sensor 66 for detecting the temperature of the bath water returning from the bathtub P4 to the bath heat exchanger 4 is provided at a position near the suction port of the bath pump 36 in the bath return pipe 141. A bath temperature sensor 67 for detecting the temperature of hot water led out from the bath heat exchanger 4 to the bathtub P4 is provided at a position near the downstream end of the bath piping 142.

  An outside air temperature sensor 68 that detects the temperature of air taken into the housing 10 from the air supply port 101 is provided in the vicinity of the air supply port 101 in the housing 10. In the present embodiment, the outside air temperature sensor 68 is provided in the housing 10 in the vicinity of the air supply port 101. However, the outside air temperature sensor 68 is used for the hot water supply operation, the heating operation, and the operation standby. If it is a position where the temperature of the air taken in can be detected, for example, it may be provided near the suction port of the air supply / exhaust fan 15, or air conduction between the air supply port 101 and the air supply / exhaust fan 15. It may be provided in the route.

  The bypass pipe 140 includes a hot water solenoid valve 53 that can block the supply of hot water from the hot water heat exchanger 21 to the bath return pipe 141, and a bath that prevents backflow of bath water from the bath return pipe 141 to the bypass pipe 140. A water check valve 54 and a hot water amount sensor 55 for detecting the flow rate of hot water in the bypass pipe 140 are provided in this order from the upstream side.

  Of the hot water flow path on the hot water supply side constituted by the hot water supply heat exchanger 21, the water supply pipe 121, the hot water supply pipe 122, etc., the hot water supply passes through the hot water supply heat exchanger 21 from a predetermined position downstream from the vicinity of the upstream end of the water supply pipe 121. Freezing prevention heaters 71 to 78 are provided in the hot water supply side main flow path from the vicinity of the downstream end of the pipe 122 to a predetermined position on the upstream side. More specifically, in the hot water supply side main path, a heater 71 that heats a position downstream of the water amount adjustment valve 52 in the water supply pipe 121 and a heater 72 that heats a position in the vicinity of the connection part of the water supply pipe 121 with the hot water supply side latent heat exchange section 21B. , A heater 73 that heats the position near the connecting portion of the communication pipe 123 with the hot water supply side latent heat exchange unit 21B, a heater 74 that heats a substantially intermediate position of the connection pipe 123, a heater 75 that heats the hot water supply side latent heat heat exchange unit 21B, In the heater 76 that heats the vicinity of the connecting portion of the hot water supply pipe 122 with the hot water supply side sensible heat exchanging portion 21A, the heater 77 that heats the downstream vicinity of the can body temperature sensor 62 in the hot water supply pipe 122, and the hot water supply pipe 122 A heater 78 that heats a position in the vicinity of the upstream side of the hot water supply temperature sensor 63 is provided.

  In the hot water flow path on the hot water supply side, heaters 81 to 82 for preventing freezing are also provided in the hot water supply side sub-flow channel excluding the arrangement portions (hot water supply side main flow channel) of the heaters 71 to 78. More specifically, the hot water supply side sub-flow channel is provided with a heater 81 that heats a position upstream of the water amount sensor 51 in the water supply pipe 121 and a heater 82 that heats a position downstream of the hot water supply temperature sensor 63 in the hot water supply pipe 122. Yes.

  Of the hot water flow paths on the heating side, the heating side sub-flow path excluding the heating heat exchanger 31, the heating return pipe 131, the heating outgoing pipe 132, the connecting outgoing pipe 133, and the connecting return pipe 134 is also used for preventing freezing. Heaters 83 to 86 are provided. More specifically, in the heating side sub-channel, the heater 83 that heats the vicinity of the branch portion of the bypass pipe 140 and the bath return pipe 141, the heater 84 that heats the bath pump 36, and the cistern 33 in the supplementary water pipe 135 are connected. A heater 85 that heats the vicinity of the unit and a heater 86 that heats the drain neutralizer 17 are provided.

  Although not shown, ignition is performed by spark discharge in the vicinity of each flame hole of the hot water supply burner 22 and the heating burner 32, a valve device that adjusts the supply amount of fuel gas to the fan motor of the supply / exhaust fan 15, the hot water supply burner 22 and the heating burner 32. Flame detection sensor for detecting ignition of electrodes, hot water supply burner 22 and heating burner 32, circulation pump 34, bath pump 36, drain pump 37, water replenishing solenoid valve 45, water amount sensor 51, water amount adjusting valve 52, hot water filling solenoid valve 53, Hot water amount sensor 55, water supply temperature sensor 61, can body temperature sensor 62, hot water supply temperature sensor 63, low temperature heating temperature sensor 64, high temperature heating temperature sensor 65, bath return temperature sensor 66, bathing temperature sensor 67, outside air temperature sensor 68, hot water supply The 1st heater groups 71-78 provided in the peripheral part of the heat exchanger 21, and the 2nd heater groups 81- provided in the other location Any 6 are connected through electrical wiring to the control circuit C1 incorporated in the housing 10.

  The control circuit C1 includes a hot water supply operation for supplying hot water heated by the hot water supply heat exchanger 21 to the hot water tap P2, a heating operation for circulating hot water heated by the heating heat exchanger 31 to the heating terminal P3, and bath heat exchange. Controls the main operation of the hot water supply / heating heat source unit 1 such as a bath chasing operation that circulates hot water heated by the heater 4 to the bathtub P4 and a hot water supply operation that supplies hot water heated by the hot water supply heat exchanger 21 to the bathtub P4. A hot water supply and heating control program is incorporated.

  Further, the control circuit C1 operates the first heater groups 71 to 78 and the second heater groups 81 to 86 under different operating conditions in accordance with the detected temperature (outside air temperature) Th of the outside air temperature sensor 68, and the hot water distribution path. A heater control program for heating a predetermined part is incorporated.

  Further, in the memory circuit of the control circuit C1, the heating degree of the heating target portion by the first heater groups 71 to 78 and the second heater groups 81 to 86 for each outside air temperature Th (here, in the control cycle of the heater for 30 minutes) A plurality of heating setting tables indicating the operation time S1 and the operation stop time S2) are stored. In the present embodiment, a heating setting table A during heating operation, a heating setting table B during hot water supply operation, and a heating setting table C during operation standby shown in FIG. 2 are stored.

  The heating operation of the hot water flow path by the first heater groups 71 to 78 and the second heater groups 81 to 86 of the hot water supply / heating heat source machine 1 will be described with reference to the flowchart of FIG. When the following heating operation is performed, if the operation switch is turned on at an operation terminal (not shown), a main control program such as a hot water heating / heating control program or a heater control program incorporated in the control circuit C1 is activated. Then, a hot water supply operation, a heating operation, or the like can be performed, that is, an operation standby state is established.

  When the operation switch is turned on, it is determined whether or not the outside air temperature Th is lower than a preset lower reference temperature T1 (for example, 3 ° C.) (ST1). As a result, if the outside air temperature Th is equal to or higher than the lower limit reference temperature T1 (No in step ST1), it is assumed that freezing does not occur in any of the hot water flow paths on the hot water supply side and the heating side. And the 2nd heater groups 81-86 are maintained in an operation stop state.

  Although not shown, when the heating switch is turned on at the heating terminal P3, the air supply / exhaust fan 15 is operated at a predetermined number of revolutions, the circulation pump 34 is operated, and the heating burner 32 is further turned on. Ignition combustion is performed at a predetermined combustion amount. Thereby, the hot water heated by the heating heat exchanger 31 is circulated and supplied to the heating terminal P3. When the hot water tap P2 is opened and the water flow sensor 51 detects that the water flow rate exceeds the predetermined flow rate, the water supply / exhaust fan 15 is operated at a predetermined rotational speed and the hot water supply burner 22 is ignited at a predetermined combustion amount. Burn. Thereby, the hot water heated by the hot water supply heat exchanger 21 is supplied to the hot water tap P2.

  On the other hand, when the operation switch is turned on and the outside air temperature Th is lower than the lower limit reference temperature T1 (Yes in step ST1), the first heater groups 71 to 78 and the second heater groups 81 to 86 are turned on. Both are operated (ST2). At this time, if it is in the operation standby state in which neither the hot water supply operation nor the heating operation is performed (No in step ST3, No in step ST4), the operation time S1 set in the heating setting table C during operation standby is set. Based on the operation stop time S2, the first heater groups 71 to 78 and the second heater groups 81 to 86 are on / off controlled (ST5).

  Specifically, for example, when the outside air temperature Th is 3 ° C., the operation of operating both the first heater groups 71 to 78 and the second heater groups 81 to 86 for 5 minutes and stopping them for 25 minutes is repeated. When the outside air temperature Th is 0 ° C., the first heater group 71 to 78 is operated for 10 minutes and stopped for 20 minutes, and the second heater group 81 to 86 is operated for 5 minutes and stopped for 25 minutes, respectively. repeat. When the outside air temperature Th is −5 ° C., the first heater groups 71 to 78 are always operated, and the second heater groups 81 to 86 are operated for 15 minutes and stopped for 15 minutes (see “ See Table C).

  The on / off control of the first heater groups 71 to 78 and the second heater groups 81 to 86 is performed until the outside air temperature Th becomes equal to or higher than a preset upper reference temperature T2 (for example, 7 ° C.) (ST6). Thereafter, if the outside air temperature Th becomes equal to or higher than the upper limit reference temperature T2 (Yes in step ST6), the first heater groups 71 to 78 are assumed to be free from freezing in any of the hot water flow paths on the hot water supply side and the heating side. Then, the operations of the second heater groups 81 to 86 are both stopped, and the process returns to step ST1 (ST7). Although not shown, the first heater group 71 to 78 and the second heater group 81 to 86 are operated in the same manner when the operation switch is turned off during the steps ST3 to ST6. Both stop and return to step ST1.

  When the heating operation is executed while the steps ST3 to ST6 are being performed or when the first heater group 71 to 78 and the second heater group 81 to 86 are operated in the step ST2 (Yes in step ST3), on / off control of the first heater groups 71 to 78 and the second heater groups 81 to 86 is performed based on the operation time S1 and the operation stop time S2 set in the heating setting table A during the heating operation. (ST8).

  Specifically, for example, when the outside air temperature Th is 3 ° C., the operation of operating the first heater groups 71 to 78 and the second heater groups 81 to 86 for 10 minutes and stopping them for 20 minutes is repeated. When the outside temperature Th is 0 ° C., the first heater group 71 to 78 is operated for 15 minutes and stopped for 15 minutes, and the second heater group 81 to 86 is operated for 10 minutes and stopped for 20 minutes, respectively. repeat. When the outside air temperature Th is −5 ° C., the first heater groups 71 to 78 are always operated, and the second heater groups 81 to 86 are operated for 20 minutes and stopped for 10 minutes. When the outside air temperature Th is −8 ° C., the first heater groups 71 to 78 and the second heater groups 81 to 86 are always operated (see “Table A” in FIG. 2). When the hot water supply operation is performed together with the heating operation, the first heater groups 71 to 78 are always stopped regardless of the outside temperature Th, and the second heater groups 81 to 86 are set in the table A as described above. On / off control is performed based on the above.

  The heating operation is performed while the steps ST3 to ST6 are being performed or when the first heater groups 71 to 78 and the second heater groups 81 to 86 are operated together in the step ST2. If only the hot water supply operation is executed (No in step ST3, Yes in step ST4), the first operation time S1 and the operation stop time S2 set in the heating setting table B during the hot water operation are used. The heater groups 71 to 78 and the second heater groups 81 to 86 are on / off controlled (ST9).

  Specifically, for example, if the outside air temperature Th is −2 ° C. or higher, both the first heater groups 71 to 78 and the second heater groups 81 to 86 are always stopped. When the outside air temperature Th is −3 ° C., the second heater groups 81 to 86 are operated for 20 minutes and stopped for 10 minutes while the first heater groups 71 to 78 are always stopped. When the outside air temperature Th is −5 ° C., the second heater groups 81 to 86 are always operated while the first heater groups 71 to 78 are always stopped (see “Table B” in FIG. 2).

  Thereafter, when the outside air temperature Th becomes equal to or higher than the upper reference temperature T2 (Yes in step ST6), as described above, the operations of the first heater groups 71 to 78 and the second heater groups 81 to 86 are both stopped, and ST1 Return to step (ST7).

  As described above, according to the hot water supply / heating heat source unit 1, when the detected temperature Th of the outside air temperature sensor 68 becomes lower than the lower limit reference temperature T1 during the heating operation, the hot water supply side main flow path in the hot water distribution path is on standby. Than the hot water supply side sub-channel. Therefore, even if low temperature outside air is introduced into the arrangement portion of the hot water supply heat exchanger 21 by the supply / exhaust fan 15, the hot water supply side main flow path can be prevented from freezing. Moreover, since the heating time of the hot water supply side sub-flow channel is set shorter than the heating time of the hot water supply side main flow channel, the casing of the water amount sensor 51 and the packing member of the water amount adjustment valve 52 disposed in the hot water supply side sub flow channel. Further, deterioration due to heating of the casing of the bath pump 36 and the casing of the drain neutralizer 17 disposed in the heating side sub-channel can be suppressed. Further, unnecessary power consumption can be reduced accordingly.

  Further, in the hot water supply / heating heat source machine 1, the operations of the first heater groups 71 to 78 and the second heater groups 81 to 86 can be controlled based on the temperature detected by one temperature sensor (outside air temperature sensor 68). Therefore, it is possible to simplify the configuration of the entire heat source unit. In particular, an outdoor installation type in which the temperature difference between the air taken into the housing 10 by the air supply / exhaust fan 15 and the outdoor air is relatively small. It is useful for hot water heaters and heat source machines.

  In the above embodiment, when the detected temperature Th of the outside air temperature sensor 68 becomes lower than the lower limit reference temperature T1 during the heating operation, the hot water supply side main flow path in the hot water distribution path is set in the hot water supply side rather than during operation standby. Although what was comprised so that it might heat for a long time rather than a subchannel was demonstrated, as the heating setting table which shows the heating degree of the heating object part for every external temperature Th, the emitted-heat amount of a heater is the 1st heater groups 71-78. And the second heater group 81 to 86 separately, and the first heater provided in the hot water supply side main flow path when the detected temperature Th of the outside air temperature sensor 68 becomes lower than the lower limit reference temperature T1 during the heating operation. The heat generation amount of the groups 71 to 78 may be configured to be set to be larger than that during the operation standby and larger than the heat generation amounts of the second heater groups 81 to 86 provided in the hot water supply side sub-flow channel. Also in this case, the same operational effects as the hot water supply / heating heat source unit 1 according to the above embodiment are obtained.

  Moreover, although the said embodiment demonstrated what was comprised so that the 1st heater groups 71-78 and the 2nd heater groups 81-86 might be act | operated simultaneously, if outside temperature Th became less than minimum reference temperature T1. As shown in FIG. 4, when the outside air temperature Th becomes lower than the lower limit reference temperature T1, the second heater group 81 is activated after a predetermined time (for example, 5 minutes) after the first heater groups 71 to 78 are operated. It is good also as what was comprised so that -86 might be operated, and conversely, what was comprised so that the 1st heater group 71-78 might be operated after predetermined time, after operating the 2nd heater group 81-86. It is good.

  As described above, since the first heater groups 71 to 78 and the second heater groups 81 to 86 have different operation start timings, peak currents when operating the heaters can be suppressed. Even in an environment where the power supplied to the heat source device 1 is limited to a certain level or less, the stability of the operation can be ensured.

  Moreover, in the said embodiment, it is the outdoor installation type hot-water supply heating heat source machine comprised so that outdoor air might be taken in in the housing | casing 10 directly from the air supply port 101, and it may discharge | emit to the outdoors through the exhaust port 102, Although the description has been given of the case where the internal space of the housing 10 communicates directly with the outdoors via the air supply port 101 and the exhaust port 102, the present invention is an indoor installation type hot water supply / heating heat source used indoors. The present invention can also be applied to an apparatus configured to take indoor air from the air supply port 101 into the housing 10 and discharge the indoor air to the outside through an exhaust pipe connected to the exhaust port 102. Moreover, it is a hot water supply / heating heat source machine installed indoors, and takes outdoor air into the housing 10 through an air supply pipe connected to the air supply port 101 and discharges it to the outside through an exhaust pipe connected to the exhaust port 102. It is applicable also to what was comprised in this way.

  In the embodiment described above, what has a memorial function or a hot water filling function in addition to a hot water function and a heating function has been described. Is also applicable. Moreover, although the said embodiment demonstrated what was comprised so that the bath water in bathtub P4 might be heated and circulated between the bath heat exchangers 4, this invention is the heating heat source similarly to the heating terminal P3. The present invention can also be applied to a hot water supply / heating heat source apparatus configured to heat and circulate bath water in the bathtub P4 with the unit 3.

1 Hot water supply / heating heat source machine 10 Case 121 Water supply pipeline (water entry pipeline)
122 Hot water supply pipe (outflow pipe)
15 Supply / Exhaust Fan 21 Hot Water Supply Heat Exchanger 22 Hot Water Supply Burner 31 Heating Heat Exchanger 32 Heating Burner 68 Outside Air Temperature Sensors 71-78 First Heater Group 81-86 Second Heater Group P2 Hot Water Tap P3 Heating Terminal

Claims (3)

A burner for burning fuel gas, a supply / exhaust fan for supplying combustion air for the burner from outside the housing, a heat exchanger for recovering heat in the combustion exhaust gas generated by the burner and heating hot water, and a heat exchanger The hot water supply path inside the housing including the water inlet pipe for introducing hot water, the hot water outlet for extracting hot water from the heat exchanger, and the heat exchanger, the hot water supply pipe, and the hot water outlet pipe are heated at predetermined locations. A plurality of heaters, an outside air temperature sensor that detects the temperature of outside air introduced into the housing, and a heater that operates the heater when the temperature detected by the outside air temperature sensor is lower than the reference temperature to heat the hot water flow path Control means, means for executing hot water supply operation for supplying hot water heated by the heat exchanger to an external hot water tap, and means for executing heating operation for circulating and supplying hot water heated by the heat exchanger to an external heating terminal; With a hot water heater / heat source machine equipped with I,
The heater is disposed in a heat exchanger in the hot water distribution path and a first heater group disposed in a main flow path including a predetermined flow area above and below the first flow path, and in a sub flow path excluding the main flow path in the hot water flow path. It can be divided into two heater groups and can be controlled.
The heater control means differs in heating degree between the first heater group and the second heater group when the detected temperature of the outside air temperature sensor becomes lower than the reference temperature in each of the hot water supply operation, the heating operation, and the operation standby state. Hot water supply heating heat source machine that operates the heater. The hot water supply / heating heat source machine according to claim 1,
The heater control means sets the heating degree in the first heater group to be larger than the heating degree in the second heater group when the detected temperature of the outside air temperature sensor becomes lower than the reference temperature during the heating operation and the hot water supply operation stop. Hot water supply heating heat source machine that operates the heater. The hot water supply / heating heat source machine according to claim 1 or 2,
A hot water supply / heating heat source machine that, when the detected temperature becomes lower than a reference temperature, makes the operation timings of the first heater group and the second heater group different by a predetermined time.

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