JP2006214608A - Composite heat source machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a composite heat source machine capable of securely preventing hot water having higher temperature than temperature of hot water coming out of a hot-water supply device from being supplied into a bathtub during water filling operation. <P>SOLUTION: When a hot-water filling valve 137 is opened to fill the bathtub 12 with hot water via a bath circulation circuit 13 from a hot-water filling and pouring passage 135 after closing an additionally heating valve 133 while hot water heated by a second heat exchanger 3-2 comes out into a heating circulation circuit 9 by performing heating operation and temperature T<SB>out</SB>on an outlet side of a liquid-liquid heat exchanger 132 exceeds temperature T<SB>in</SB>+ α on an inlet side, a controller 7 is provided with an additionally heating valve failure detection means for detecting that the additionally heating valve 133 is in a failure condition and a hot-water filling inhibiting means for inhibiting hot-water filling operation when failure of the additionally heating valve 133 is detected by the additionally heating valve failure detection means. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a composite heat source machine having a function of filling a bathtub, a function of replenishing hot water in the bathtub, and a hot water heating function.

  Conventionally, hot water operation that supplies hot water at a specified temperature generated by a water heater to a bathtub from a hot water pouring channel via a bath circulation circuit, and hot water heated by a heating heat exchanger The heating operation to supply hot water heaters such as hot air heaters and floor heaters through the air, and the heat circulation of the hot water flowing through the heating circulation circuit connected to the bath circulation circuit and the heating circulation circuit There is known a composite heat source machine that includes a liquid heat exchanger that heats hot and cold water flowing through a bath circulation circuit and performs a reheating operation of hot water in a bathtub.

  Here, the hot water supply path from the water heater to the bathtub branches into two at the connection point between the hot water pouring channel and the bath circulation circuit, and one path does not pass through the liquid heat exchanger, This route passes through the liquid-to-liquid heat exchanger (both conveying hot water filling). Therefore, when hot water is supplied from the heating circulation circuit to the liquid heat exchanger during the hot water filling operation, the hot water of a predetermined temperature supplied from the water heater is further heated by the liquid heat exchanger, There is an inconvenience that hot water is supplied to the bathtub.

Therefore, a recirculation passage that bypasses the hot air heater and connects the heating circulation circuit is provided, and a recuperation valve that connects the liquid heat exchanger to the bath circulation circuit and the recirculation passage and opens and closes the recirculation passage is provided. Thus, when a hot water filling operation is performed during heating operation, a composite heat source machine is proposed in which the bypass on-off valve is closed to cut off the supply of hot water from the heating circulation circuit to the liquid heat exchanger. (For example, refer to Patent Document 1).
Japanese Patent No. 3417184

  As described above, when a liquid heat exchanger is connected to the reheating passage and hot water filling operation is performed during heating operation, the reheating valve is closed to supply hot water to the liquid heat exchanger. By shutting off, it is basically possible to prevent the hot water having a temperature higher than the temperature of the hot water from the water heater from being supplied to the bathtub.

  However, the inventors of the present application perform the closing operation of the reheating valve in this way, and even when the hot water filling operation is performed, the temperature of the hot water supplied to the bathtub is higher than the temperature of the hot water supplied from the water heater. It has been found that there is a case where it becomes higher. Then, an object of this invention is to provide the composite heat source machine which prevented reliably the hot water of temperature higher than the hot water temperature from a hot water supply device at the time of execution of hot water filling operation.

  The present invention has been made to achieve the above object, and includes a heating circulation circuit communicating with a hot water heater, a heating / hot water circulation means for circulating hot water in the heating circulation circuit, and the heating / hot water circulation means. Heating control means for executing a heating operation for circulating hot water in the heating circulation circuit and supplying hot water to the hot water heater, a bath circulation circuit communicating with the bathtub, and a bath hot water circulation means for circulating hot water in the bath circulation circuit An additional passage that bypasses the hot water heater and communicates the heating circulation circuit, an additional valve that opens and closes the additional passage, and the bath circulation circuit and the additional passage that are connected to the additional passage. A liquid heat exchanger for heating the hot water flowing through the bath circulation circuit by heat radiation from the hot water flowing through the burning passage, and the heating valve is opened from the heating circulation circuit by the heating hot water circulation means. Memorial Reheating control means for performing reheating operation for heating hot water in the bath circulation circuit that is circulated by the bath hot water circulation means and re chasing hot water in the bathtub by supplying hot water to the road; and Connected to the bath circulation circuit via the hot water pouring channel, supplying hot water of a predetermined temperature to the hot water pouring channel, and from the hot water pouring channel, the liquid heat exchanger of the bath circulation circuit And hot water supply means for supplying hot water to the bathtub via the location where the hot water is connected, and when the heating operation is being performed, after the reheating valve is closed, hot water is supplied to the bathtub by the hot water supply means. The present invention relates to an improvement of a composite heat source apparatus including a filling control means for performing a filling operation for supplying water.

  And, when the heating valve failure is detected by the heating valve failure detection and the heating operation is executed, the heating valve failure detection means for detecting the failure of the heating valve, A hot water filling prohibiting means for prohibiting execution of the hot water filling operation is provided.

  According to the present invention, when a failure of the reheating valve is detected by the reheating valve failure detecting means and the heating operation is being executed, the hot water filling by the hot water supply means is performed by the hot water filling prohibiting means. Execution of operation is prohibited. Therefore, due to a failure of the additional valve, the additional valve does not close even when a valve closing operation is performed, and hot water is supplied from the heating circulation circuit to the additional passage by the execution of the heating operation. The hot water is supplied from the hot water supply means to the bath circulation circuit, and hot water having a temperature higher than the predetermined temperature is surely supplied from the bath circulation circuit to the bathtub by the heat exchanger by the liquid heat exchanger. Can be prevented.

  And an outlet temperature sensor for detecting a temperature of hot water flowing into the liquid heat exchanger and an outlet temperature sensor for detecting a temperature of hot water discharged from the liquid heat exchanger, The detecting means is configured to execute the hot water filling operation after the refill valve is closed by the hot water filling control means during the heating operation, and the detected temperature of the outlet temperature sensor is detected by the inlet temperature sensor. When the temperature is higher than a temperature by a predetermined temperature or more, it is detected that the renewal valve is in a failure state.

  According to the present invention, if the reflow valve is not broken, the reflow valve is closed when the refill valve is closed by the hot water filling control means. In this case, heat exchange is not performed in the liquid heat exchanger, so that the temperature of the hot water flowing through the liquid heat exchanger does not increase. Therefore, when the detected temperature of the outlet temperature sensor becomes higher than the detected temperature of the inlet temperature sensor by a predetermined temperature or more, the reheating valve is failed to open, and hot water is supplied to the reheating passage. It can be determined that heat exchange is performed in the heat exchanger.

  Further, during the chasing operation, based on the amount of heat supplied from the liquid heat exchanger to the hot water flowing through the bath circulation circuit and the degree of increase in the detected temperature of the inlet temperature sensor, A residual water amount detection means for detecting the amount of hot water is provided.

  According to the present invention, when only the reheating operation is performed and the heating operation is not performed, the heating / hot water circulation means supplies the hot water supplied to the reheating passage from the heating circulation circuit. The amount of heating per unit time supplied from the liquid heat exchanger to the hot water flowing through the bath circulation circuit can be obtained from the amount of heat or the like. In addition, when both the reheating operation and the heating operation are performed, the heat circulation of the hot water supplied to the hot water heater is taken into consideration, so that the bath circulation circuit is circulated from the liquid heat exchanger. The amount of heating per unit time supplied to the hot and cold water can be determined.

  In this case, as the amount of hot water in the bathtub increases, the degree of increase in the temperature of the hot water in the bathtub relative to the amount of heat supplied to the hot water flowing through the liquid heat exchanger decreases. Therefore, the remaining water amount grasping means is based on the amount of heat supplied to the hot water flowing through the liquid-to-liquid heat exchanger and the degree of increase in the detected temperature of the inlet temperature sensor during the follow-up operation. The amount of hot water can be grasped. And since the said inlet temperature sensor is used also for the said reheating valve failure detection means, it is not necessary to provide a temperature sensor for exclusive use in order to grasp | ascertain the residual water amount in a bathtub, and the cost of a temperature sensor is reduced. Can be reduced.

  A hot water supply temperature sensor for detecting a temperature of hot water supplied to the hot water pouring channel by the hot water supply means; and an outlet temperature for detecting a temperature of hot water discharged from the liquid heat exchanger to the bath circulation circuit. The hot water supply means performs control so that the detected temperature of the hot water supply temperature sensor becomes a predetermined temperature, and the reheating valve failure detection means controls the hot water filling control during execution of the heating operation. When the hot water filling operation is executed after the reheating valve is closed by the means, and the detected temperature of the outlet temperature sensor becomes higher than the detected temperature of the hot water temperature sensor by a predetermined temperature or more, the reheating valve Is detected as being in a failure state.

  According to the present invention, when the hot water filling operation is performed, the temperature detected by the hot water temperature sensor is supplied from the hot water pouring channel to the liquid heat exchanger via the bath circulation circuit. It becomes almost equal to the temperature of the hot water. Therefore, similarly to the case where the detected temperature of the inlet temperature sensor is used, when the detected temperature of the outlet temperature sensor becomes higher than the detected temperature of the hot water supply temperature sensor by a predetermined temperature or more, the additional valve opens. It can be determined that a failure has occurred and hot water has been supplied to the follow-up passage, and heat exchange is being performed in the liquid-to-liquid heat exchanger.

  Further, the present invention is characterized by comprising failure coping means for executing the opening and closing operations of the tracking valve when the failure detecting means detects that the tracking valve is in a failure state.

  In the present invention, when the valve is unable to be closed due to dust or the like, the opening and closing operation of the valve is performed by opening and closing the valve. In some cases, the valve can be closed. Therefore, the failure coping means executes the valve opening operation and the valve closing operation of the reflow valve when the reflow valve failure detection means detects a failure of the recharge valve, thereby performing the renewal operation. Recovery of valve failure can be achieved.

  The best mode for carrying out the present invention will be described with reference to FIGS. FIG. 1 is an overall configuration diagram of the composite heat source apparatus of the present invention, FIG. 2 is a detailed diagram of the controller shown in FIG. 1, and FIG. 3 is a flowchart of a failure detection process of the reflow valve.

  Referring to FIG. 1, the composite heat source machine of the present embodiment includes a first combustion section 2-1 for hot water supply and a second combustion section 2-2 for heating and reheating in a single can body 1. Is a single can type combined heat source machine arranged side by side across the partition wall 1a, and the entire operation is controlled by a controller 7 constituted by a microcomputer or the like. In addition, the 1st combustion part 2-1 is corresponded to the hot water supply means of this invention, and the heating hot water circulation means of this invention is comprised by the 2nd combustion part 2-2 and the heating pump 92 mentioned later.

  The 1st combustion part 2-1 has the 1st heat exchanger 3-1 for hot-water supply, and the 1st burner 4-1 which heats this, and the 2nd combustion part 2-2 is the 2nd for heating. It has the heat exchanger 3-2 and the 2nd burner 4-2 which heats this. Combustion air is supplied from a common combustion fan 5 to the first combustion unit 2-1 and the second combustion unit 2-2.

  The combustion exhaust of the first burner 4-1 is led to the first heat exchanger 3-1, and after exchanging heat with the first heat exchanger 3-1, the first heat exchanger 3-1 and the second heat exchanger 3. It flows to the exhaust hood 6 on the upper side of 3-2 and is discharged to the outside from an exhaust port 6a formed in the exhaust hood 6. Similarly, the combustion exhaust of the second burner 4-2 is guided to the second heat exchanger 3-2, and after flowing through the second heat exchanger 3-2, flows into the exhaust hood 6 and from the exhaust port 6a. It is discharged outside. The rotation speed of the combustion fan 5 is controlled by the controller 7 so that the amount of combustion air corresponding to the combustion amount of the first burner 4-1 and the second burner 4-2 is supplied.

  The first heat exchanger 3-1 is connected to an upstream water supply passage 8a and a downstream hot water supply passage 8b. The water supply passage 8 a is provided with a flow rate sensor 81 and a flow rate adjustment valve 82 controlled by the controller 7, and further, a bypass passage 8 c that communicates the water supply passage 8 a and the hot water supply passage 8 b on the downstream side of the flow rate adjustment valve 82. A bypass flow rate adjusting valve 83 that is provided and controlled by the controller 7 is interposed in the bypass passage 8c. Further, the hot water supply passage 8b is provided with an upstream hot water temperature sensor 84 and a downstream hot water temperature sensor 85 (corresponding to the hot water supply temperature sensor of the present invention) at the junction with the bypass passage 8c.

  Detection signals from the flow sensor 81 and the hot water temperature sensors 84 and 85 are input to the controller 7. And the controller 7 starts the water flow to the 1st heat exchanger 3-1, the currant 86 of the downstream end of the hot water supply path 8b is opened, and the detection flow volume of the flow sensor 81 becomes more than predetermined | prescribed minimum flow volume. When the combustion fan 5 is driven, the first burner 4-1 is ignited and the "hot water supply operation" is executed. In the “hot water supply operation”, the controller 7 controls the combustion amount of the first burner 4-1 so that the hot water supply side hot water temperature detected by the hot water temperature sensor 84 becomes a predetermined high temperature set temperature, and the first burner. If the detected temperature of the hot water temperature sensor 84 does not reach the high temperature set temperature even if the combustion amount of 4-1 becomes the maximum, the flow rate of the water to the first heat exchanger 3-1 is decreased by the flow rate adjustment valve 82.

  And the controller 7 controls the amount of flowing water (bypass mixing amount) of the bypass passage 8c by the bypass flow rate adjusting valve 83 so that the detected temperature of the hot water temperature sensor 85 becomes the hot water supply temperature set by the remote controller 7a.

  The second heat exchanger 3-2 is a hot water hot air heater 10 (corresponding to the hot water heater of the present invention) which is a high temperature heating terminal having a relatively high required hot water temperature via the heating circulation circuit 9. It is connected. In FIG. 1, one hot air heater is shown, but a plurality of hot air heaters 10 can be connected in parallel to the heating circuit 9. The heating circulation circuit 9 includes a heating forward passage 9a for sending hot water heated by the second heat exchanger 3-2 to the hot air heater 10, and hot water flowing through the hot air heater 10 to the second heat exchanger. The heating return passage 9b returns to 3-2.

  A systern 91 and a heating pump 92 controlled by the controller 7 are interposed in the heating return passage 9b. When the operation switch (not shown) of the hot air heater 10 is turned ON, the controller 7 opens the water valve 10a of the hot 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 second heat exchanger 3-2 via the heating circulation circuit 9.

  Further, in the present embodiment, the floor heating panel 11 (corresponding to the hot water heater of the present invention) which is a low temperature heating terminal whose required hot water temperature is relatively low is provided, and heating on the downstream side of the heating pump 92 is provided. A low-temperature heating forward passage 9c is branched from the return passage 9b 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 passage 9d. When an operation switch (not shown) of the floor heating panel 11 is turned ON, the controller 7 opens the water passage valve 11a of the floor heating panel 11 and drives the heating pump 92 to execute “heating operation”. To do. As a result, hot water is circulated to the second heat exchanger 3-2 via the bypass passage 9d, and part of the hot water sent from the heating pump 92 is supplied to the floor heating panel 11, so that the second heat exchange is performed. Heat from the device 3-2 is transmitted to the floor heating panel 11 through the cistern 91.

  A hot water temperature sensor 93 for detecting the temperature of the hot water sent from the second heat exchanger 3-2 is provided upstream of the heating outbound passage 9a, and a detection signal from the hot water temperature sensor 93 is input to the controller 7. Is done. Then, when the operation switch of the hot air heater 10 or the floor heating panel 11 is turned on to perform the “heating operation”, the controller 7 determines that the heating side hot water temperature detected by the hot water temperature sensor 93 is the hot air heater. 10 and the amount of combustion of the second burner 4-2 are controlled so that the required hot water temperature of the floor heating panel 11 is obtained. 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 2nd heat exchanger 3-2 functions also as a heat source at the time of bathing. The bath circulation circuit 13 connected to the bathtub 12 is provided with a bath pump 131 (corresponding to the bath / hot water circulation means of the present invention) controlled by the controller 7 and a liquid heat exchanger 132. Further, the heating circulation circuit 9 is provided with a reheating passage 9e from the heating retreat passage 9a through the liquid heat exchanger 132 to the systern 91, and a retreat valve controlled by the controller 7 in the reheating passage 9e. 133 is interposed.

  When a reheating switch (not shown) provided in the remote controller 7a is turned on, the controller 7 drives the bath pump 131 to circulate hot water in the bathtub 12 through the bath circulation circuit 13 and a reheating valve. 133 is opened, the heating pump 92 is driven, the second burner 4-2 is ignited, and the “refreshing operation” is executed. In the “reheating operation”, hot water heated by the second heat exchanger 3-2 circulates in the heating circulation circuit 9 via the liquid-liquid heat exchanger 132 and circulates in the bath circulation circuit 13. Hot and cold water is heated by the liquid-liquid heat exchanger 132.

  An inlet temperature sensor 141 is provided on the inlet side and an outlet temperature sensor 140 is provided on the outlet side in the vicinity of the connection point between the bath circulation circuit 13 and the liquid-liquid heat exchanger 132. Then, detection signals from the inlet temperature sensor 141 and the outlet temperature sensor are input to the controller 7. The controller 7 ends the “tracking operation” when the temperature detected by the inlet temperature sensor 141 rises to the tracking temperature set by the remote controller 7a.

  Further, a hot water pouring channel 135 branched from the hot water supply channel 8 b is connected to the bath circulation circuit 13 via a check valve 136. A hot water filling valve 137 controlled by the controller 7 is interposed in the hot water pouring channel 135, and when the hot water filling switch (not shown) provided in the remote controller 7 a is turned on, the controller 7 Then, the hot water filling valve 137 is opened, and the “hot water filling operation” is performed in which the hot water heated by the first heat exchanger 3-1 is supplied to the bathtub 12 through the hot water pouring channel 135.

  Next, the supply of fuel gas to the first burner 4-1 and the second burner 4-2 will be described. A main valve 41 and a proportional valve 42 are interposed in the common gas supply path 40 for the first burner 4-1 and the second burner 4-2. The fuel gas is supplied from the gas supply path 40 to the first burner 4-1 through the capacity switching valves 43S, 43M, 43L of the first burner 4-1, and the second burner 4- The fuel gas is supplied to the second burner 4-2 through the second capacity switching valves 44S and 44L.

  Here, the first burner 4-1 includes 16 unit burners 4a, and the first unit burner group 4-1S connected to the capacity switching valve 43S includes three unit burners 4a. The second unit burner group 4-1M connected to 43M includes five unit burners 4a, and the third unit burner group 4-1L connected to the capacity switching valve 43L includes eight unit burners 4a. . Then, the controller 7 controls the combustion amount of the first burner 4-1 by switching opening and closing of the capacity switching valves 43 </ b> S, 43 </ b> M, and 43 </ b> L.

  The second burner 4-2 includes five unit burners 4a. The first unit burner group 4-2S connected to the capacity switching valve 44S includes two unit burners 4a, and the capacity switching valve 44L. The second unit burner group 4-2L connected to is provided with three unit burners 4a. Then, the controller 7 controls the combustion amount of the second burner by switching opening and closing of the capacity switching valves 44S and 44L.

  Next, referring to FIG. 2, the controller 7 includes a heating control unit 20 that performs the above-described “heating operation”, a tracking control unit 21 that performs the above-described “tracking operation”, and the above-described “ A hot water filling control means 22 for executing the “hot water filling operation” and a reheating valve failure detection means 23 for detecting a failure of the reheating valve 133 are provided.

  Furthermore, the controller 7 includes a hot water filling prohibiting means 24 for prohibiting the execution of the “hot water filling operation” when the trouble of the hot water valve 133 is detected by the hot water valve failure detecting means 23, and hot water in the bathtub 12. A remaining water amount detecting means 25 for detecting the amount of water, and a valve failure coping means 26 for performing a recovery operation of the failure when the failure of the additional valve 133 is detected by the additional valve failure detecting means 23. .

  In addition, the remedy valve mechanism 150 of the remedy valve 133 is driven by the stepping motor 151, the rotational position of the stepping motor 151 is controlled by a control signal output from the controller 7, and the opening degree of the remedy valve 133 is increased. Be changed. The amount of heat supplied to the hot air heaters 10 and 11 and the amount of heat supplied to the liquid heat exchanger 132 during simultaneous execution of the “heating operation” and the “heating operation” by changing the opening of the additional valve 133. Can control the distribution. Further, the remote controller 7a is provided with a display unit 31 for displaying the operating state of the composite heat source machine and a buzzer 32.

  Here, when the “hot water filling operation” is executed, referring to FIG. 1, the hot water supplied from the hot water outlet 8 b to the hot water hot water pouring path 135 is connected to the hot water pouring hot water path 135 and the bath circulation circuit 13. From the location X, it is supplied to the bathtub 12 via both the bath going-out passage 13a and the bath return passage 13b (both conveying hot water filling). Then, if heat is exchanged by the liquid heat exchanger 132 during the “hot water operation” and the hot water flowing through the bath passage 13a is heated, the remote control 7a is transferred from the bath passage 13a to the bathtub 12. Inconvenience that hot water having a temperature higher than the hot water temperature set in step 1 is supplied.

  Therefore, when performing the “hot water operation” during the “heating operation”, the hot water filling control means 22 performs the closing operation of the recirculation valve 133 to the liquid heat exchanger 132 from the heating circuit 9. The hot water supplied to the bathtub 12 via the bath passage 13a is prevented from being heated by the liquid heat exchanger 132.

  However, when the reheating valve 133 fails and the reheating valve 133 is closed by the hot water filling control means 22, the reheating valve 133 is maintained in the open state. It will occur. Therefore, the reheating valve failure detection means 23 performs a process for detecting a failure of the renewal valve 133 according to the flowchart shown in FIG.

  In STEP 1 of FIG. 3, the additional valve failure detection means 23 has an open / closed operation flag (open / closed operation F in the figure) indicating whether or not an additional operation of the additional valve 133 for failure recovery described later has been performed. (Open / close operation completed F = 0, indicating that the open / close operation is not performed). Then, in the next STEP2, it is determined whether or not the “hot water operation” has been started.

  When the “water filling operation” is started, the process proceeds to STEP 3 to determine whether or not the “water filling operation” is continued. If the “water filling operation” is being executed, the process proceeds to STEP 4. On the other hand, if “hot water filling operation” is not executed, the process returns to STEP 1 and proceeds from STEP 1 to STEP 2, and the reheating valve failure detection means 23 waits for the next “hot water filling operation” to be started.

The loop consisting of STEP 3 and STEP 4 is repeatedly executed until the “hot water filling operation” is completed, and the reheating valve failure detection means 23 is STEP 4, and the detected temperature T _out of the outlet temperature sensor 140 is the detected temperature of the inlet temperature sensor 141. It is determined whether or not T _in + α (corresponding to the predetermined temperature of the present invention) or higher. When the detected temperature T _out of the outlet temperature sensor 140 is _equal to or higher than the detected temperature T _in + α of the inlet temperature sensor 141, the heat exchanger 132 uses the heat exchanger 132 due to the valve opening failure of the reheating valve 133. Can be determined.

  For this reason, in this case, the process proceeds to STEP5, and when the open / close operation completed flag is not set (open / close operation completed F = 0), the process branches to STEP10. STEP 10 is a process performed by the valve failure handling unit 26. The valve failure handling unit 26 performs the valve opening operation of the reheating valve 133, and then continuously performs the valve closing operation of the reheating valve 133. In this way, by opening / closing the rectifying valve 133, when the cause of the failure of the rectifying valve 133 is dust biting of the valve body portion, dust is removed from the valve body portion and The valve closing operation may be possible.

In subsequent STEP 11, the additional valve failure detecting means 23 sets an open / closed operation flag to indicate that the additional valve 133 has been opened / closed (open / closed operation F = 1) and returns to STEP 3. Then, the reheating valve failure detection means 23 determines again in STEP 4 whether or not the detected temperature T _out of the outlet temperature sensor 140 is equal to or higher than the detected temperature T _in + α of the inlet temperature sensor 141.

In STEP4, when the detected temperature T _out of the outlet temperature sensor 140 is detected temperature T _in + alpha or more inlet temperature sensor 141 does not recover failure of reheating valve 133 be performed switching operation in STEP 10, additional heating It can be determined that the valve 133 is maintained in the open state and heat is exchanged in the liquid heat exchanger 132.

  In this case, the process proceeds to STEP5, but since the open / closed operation flag is set, the process proceeds to STEP6. STEP 6 is processing by the hot water filling prohibiting means 24, and the hot water filling prohibiting means 24 stops the “hot water filling operation”, and the hot water heated by the liquid heat exchanger 132 is supplied to the bathtub 12. To prevent. In addition, in the subsequent STEP 7, the reheating valve failure detection means 23 displays a failure of the renewal valve 133 on the display unit 31 of the remote controller 7a and causes the buzzer 32 to ring to indicate to the user that the renewal valve 133 has failed. Notify that it has occurred.

On the other hand, when the detected temperature T _out of the outlet temperature sensor 140 is lower than the detected temperature T _in + α of the inlet temperature sensor 141 in STEP 4, the failure of the reheating valve 133 is recovered and heat exchange in the liquid heat exchanger 132 is performed. Can be determined to have stopped. Therefore, in this case, the process returns from STEP 4 to STEP 3, and the “water filling operation” by the hot water filling prohibiting means 24 is not prohibited.

  Further, the remaining water amount detection means 25 detects the amount of hot water (remaining water amount) in the bathtub 12 from the degree of increase in the detected temperature of the inlet temperature sensor 141 during the “chase operation”. Here, the amount of remaining water in the bathtub 12 is the amount of remaining water W (l (liter)), the amount of heat supplied to the hot water flowing through the bath circulation circuit 13 in the liquid heat exchanger 132, Q (Kcal / min), and the bathtub When the rising speed of the temperature of hot water in the inside (= the temperature detected by the inlet temperature sensor 141) is Vt (° C./min), it can be calculated from the following equation (1) from Q = W · Vt.

W = Q / Vt (1)
In a single operation state in which only the “heating operation” is executed and the “heating operation” is not executed, the controller 7 causes hot water of a predetermined temperature and a predetermined flow rate to be supplied from the heating circulation circuit 9 to the liquid-to-liquid heat exchanger 132. The second burner 4-2 and the heating pump 92 are controlled so as to be supplied. In this case, Q in the above equation (1) is calculated from the following equation from the calorific value ZP of the second burner 4-2, the efficiency μ1 of the second heat exchanger 3-2, and the efficiency μ2 of the liquid heat exchanger 132: (2) can be obtained directly.

Q = ZP × μ1 × μ2 (2)
On the other hand, in the simultaneous operation state in which both the “reheating operation” and the “heating operation” are performed, the bath circulation circuit is used in the liquid heat exchanger 132 according to the heat radiation amount in the hot air heater 10 and the floor heating panel 11. The amount of heat Q supplied to the hot and cold water flowing through 13 changes. However, the circulating flow rate M (l / min) of the hot water in the bath circulation circuit 13 is substantially constant without changing in the single operation state or the simultaneous operation state. When the detected temperature of the inlet temperature sensor 141 is T _in and the detected temperature of the outlet temperature sensor 140 is T _out , the relationship of the following expression (3) is established.

Q = M · (T _out −T _in ) (3)
Here, M in the above equation (3) can be obtained by substituting Q obtained by the above equation (2) in the single operation state. Therefore, Q in the simultaneous operation state can be obtained by the above equation (3). Accordingly, even in the simultaneous operation state, the bathtub can be obtained based on the temperature increase rate Vt detected by the inlet temperature sensor 141 by the above equation (1). Twelve remaining water amounts can be calculated.

  In this way, by detecting the amount of remaining water in the bathtub 12 by the remaining water amount detecting means 25, it is possible to supply additional hot water to the bathtub 12 and fill a predetermined amount of hot water. The inlet temperature sensor 141 is used for both the detection of the residual water amount in the bathtub 12 by the residual water amount detection means 25 and the detection of the failure of the supplementary valve 133 by the supplementary valve failure detection means 23. It is not necessary to provide the inlet temperature sensor 141 exclusively for detecting a failure.

In the present embodiment, reheating valve failure detecting means 23, in STEP4 shown in FIG. 3, the detected temperature T _out of the outlet temperature sensor 140 is higher than the predetermined temperature α than the detected temperature T _in the inlet temperature sensor 141 However, instead of the inlet temperature sensor 140, the detected temperature of the hot water temperature sensor 85 may be used.

  Here, referring to FIG. 1, at the time of execution of “hot water filling operation”, a bathtub is provided from a location where the hot water temperature sensor 85 of the hot water supply passage 8 b is provided via the hot water filling pouring passage 135 and the bath circulation circuit 13. 12 is supplied with hot water. Therefore, the detected temperature of the hot water temperature sensor 85 can be regarded as the temperature of hot water supplied from the bath circulation circuit 13 to the liquid heat exchanger 141, and the detected temperature of the outlet temperature sensor 140 is higher than the detected temperature of the hot water temperature sensor 85. When the temperature becomes higher than the predetermined temperature α, it can be determined that the reheating valve 133 has failed.

  Further, in the present embodiment, the reheating valve 133 that is opened and closed by the stepping motor is shown. However, when the stepping motor is used, step-out, electrical noise, and the like are compared with the case where the thermal valve is used. There are specific abnormal factors. For this reason, it is particularly effective to detect the failure of the renewal valve 133 by the renewal valve failure detection means 23 and prohibit the execution of the “hot water filling operation” by the refilling prohibition means 24.

Further, in this embodiment, reheating valve failure detecting means 23 has been detected the failure of the reheating valve 133 using the detected temperature T _out of the detected temperature T _in the outlet temperature sensor 140 of the inlet temperature sensor 141, A flow rate sensor is provided in the follow-up passage 9e, and after closing the follow-up valve 133 when the “heating operation” is performed, the flowing water in the follow-up passage 9e is detected by the flow rate sensor. A failure may be detected.

  Further, in the present embodiment, when a failure of the remarking valve 133 is detected by the renewal valve failure detection means 23 in STEP4 of FIG. 3, the renewal valve 133 is opened and closed in STEP10 and the renewal valve 133 is operated. Although the process for recovering the failure is performed, the effect of the present invention can be obtained even when the process is not performed.

The whole heat source machine composition figure of the present invention. FIG. 2 is a detailed diagram of the controller shown in FIG. 1. The flowchart of the failure detection process of an additional valve.

Explanation of symbols

  2-1 ... 1st combustion part, 2-2 ... 2nd combustion part, 3-1 ... 1st heat exchanger, 3-2 2nd heat exchanger, 4-1 ... 1st burner, 4-2 ... 1st 2 burner, 7 ... controller, 9 ... heating circulation circuit, 9e ... reheating passage, 10 ... warm air heater, 11 ... floor heating panel, 13 ... bath circulation circuit, 20 ... heating control means, 21 ... reheating control means , 22 ... Hot water filling control means, 23 ... Reheating valve failure detection means, 24 ... Hot water filling prohibition means, 25 ... Residual water amount detection means, 26 ... Valve failure countermeasure means, 132 ... Liquid heat exchanger, 133 ... Reheating Valve, 135 ... Hot water pouring channel, 140 ... Outlet temperature sensor, 141 ... Inlet temperature sensor

Claims (5)

A heating circulation circuit communicating with the hot water heater, a heating / hot water circulation means for circulating hot water in the heating circulation circuit, hot water is circulated in the heating circulation circuit by the heating / hot water circulation means, and hot water is supplied to the hot water heater. Heating control means for executing the heating operation to be supplied;
A bath circulation circuit communicating with the bathtub, a bath / hot water circulation means for circulating hot water in the bath circulation circuit, a follow-up passage for bypassing the hot water heater and communicating the heating circulation circuit, and the follow-up passage A recirculation valve that opens and closes, a liquid-to-water heat exchanger that heats the hot water flowing through the bath circulation circuit by radiating heat from the hot water flowing through the recirculation passage connected to the bath circulation circuit and the recirculation passage The hot water in the bath circulation circuit circulated by the bath hot water circulation means is opened by opening the additional valve and supplying hot water from the heating circulation circuit to the additional passage by the heating hot water circulation means. Reheating control means for performing reheating operation for heating and revolving hot water in the bathtub;
The bath circulation circuit is connected to the hot water pouring channel, supplies hot water at a predetermined temperature to the hot water pouring channel, and the liquid heat exchange of the bath circulating circuit is performed from the hot water pouring channel. A hot water supply means for supplying hot water to the bathtub via a place where a heater is connected, and when the heating operation is being performed, after the reheating valve is closed, the hot water supply means supplies the hot water to the bathtub. In a combined heat source machine comprising a hot water filling control means for performing hot water filling operation for supplying hot water,
An additional valve failure detection means for detecting a failure of the additional valve;
A hot water filling prohibiting means for prohibiting the hot water filling operation from being performed when the trouble of the hot water valve is detected by the detection of the hot water valve failure and the heating operation is being executed. Combined heat source machine. An inlet temperature sensor for detecting the temperature of hot water flowing from the bath circulation circuit into the liquid heat exchanger, and an outlet temperature sensor for detecting the temperature of hot water discharged from the liquid heat exchanger to the bath circulation circuit; With
The reheating valve failure detection means performs the hot water filling operation after the hot water filling control means closes the reheating valve during the heating operation, and the detected temperature of the outlet temperature sensor is the temperature detected by the outlet temperature sensor. 2. The composite heat source apparatus according to claim 1, wherein when the temperature of the intake valve becomes higher than a temperature detected by the inlet temperature sensor, the additional valve is detected to be in a failure state.   Based on the amount of heat supplied from the liquid heat exchanger to the hot water flowing through the bath circulation circuit and the degree of increase in the detected temperature of the inlet temperature sensor during execution of the reheating operation, the hot water in the bathtub 3. The combined heat source apparatus according to claim 2, further comprising a remaining water amount detecting means for detecting the amount. A hot water supply temperature sensor for detecting the temperature of hot water supplied to the hot water pouring channel by the hot water supply means, and an outlet temperature sensor for detecting the temperature of hot water discharged from the liquid heat exchanger to the bath circulation circuit; With
The hot water supply means performs control so that the detected temperature of the hot water temperature sensor becomes a predetermined temperature,
The reheating valve failure detection means performs the hot water filling operation after the hot water filling control means closes the reheating valve during the heating operation, and the detected temperature of the outlet temperature sensor is the temperature detected by the outlet temperature sensor. 2. The composite heat source apparatus according to claim 1, wherein when the temperature is higher than a temperature detected by a hot water supply temperature sensor by a predetermined temperature or more, the additional valve is detected to be in a failure state.   Characterized in that it comprises valve failure coping means for performing the opening and closing operations of the directional valve when the directional valve failure detecting means detects that the directional valve is in a failure state. The composite heat source machine according to any one of claims 1 to 4, wherein:

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