JP2017133732A - Heat source machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat source machine including a temperature sensor 13 and a control unit 18, the control unit 18 being configured to give an error notification when it is determined at a plurality of times or more that a detection temperature of the temperature sensor 13 is an abnormal value, which can rapidly determine whether the temperature sensor 13 is in an abnormal state after replacement of the temperature sensor 13.SOLUTION: A control unit 18 is configured to store in an EEPROM 18b abnormality information that a temperature sensor 13 is in an abnormal state when an abnormality determination count number reaches a prescribed number, and when the abnormality information is stored in the EEPROM 18b, give an error notification at one abnormality determination of detection temperature.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a heat source device, and more particularly to a device having a function of notifying a malfunction of a predetermined temperature sensor such as a clogging clogging detection thermistor or an abnormality such as a mounting failure.

  The applicant of the present application discloses, for example, a hot water supply device (heat source device) including a thermistor for detecting clogging of scale stone in Patent Document 1 below. The canister clogging detection thermistor is attached to the back surface of the combustion can body, for example, in the vicinity of the heat exchanger. Since the hot water flow rate decreases and the temperature of the combustion can body rises as the amount of scale in the heat exchanger piping increases, is the scale clogged based on the detection temperature of the scale clogging thermistor? Whether or not can be determined by a microcomputer (control unit).

JP, 2015-102323, A

  The above-mentioned clogging clogging thermistor is exposed to high temperatures, so the possibility of an open failure is relatively high. However, even if the can body temperature rises at the time of an open failure, the microcomputer will falsely detect that the can temperature is low. Stone clogging cannot be detected normally.

  For this reason, it is preferable to perform a process for determining whether or not the canister clogging detection thermistor can normally detect the increase in the can body temperature at every predetermined timing. For example, during combustion, the temperature of the can increases without fail and the resistance value of the thermistor decreases. However, even if the temperature of the can increases, the insulation becomes inactive and the temperature detected by the microcomputer is low. Therefore, at the start of combustion and every hour of continuous combustion, it is determined by comparison with a predetermined abnormality reference value (for example, 35 ° C.) whether the detected temperature of the scale clogging detection thermistor is in the normal range, that is, high temperature. When the number of abnormalities continuously determined to be less than the abnormal reference value reaches a predetermined number (for example, 10 times), it is determined that the thermite clogging detection thermistor is abnormal, and the clogging clogging detection thermistor abnormality is detected. It is possible to perform a predetermined error notification indicating that the combustion operation is prohibited. Here, the error notification is not performed until the number of abnormalities reaches a predetermined number of times. The thermistor for detecting clogging of stones does not directly detect clogging of stones, but is based on the temperature of the body rising due to clogging of stones. Because the can body temperature is also affected by the outside air temperature, the water supply temperature and other factors, by determining that the can body is clogged by detecting the abnormality of the can body temperature multiple times, This is to prevent erroneous determination.

  When an error notification for the detection of clogged clogging thermistors is given, a maintenance man replaces the thermistor for clogging clogged clogging detection. The thermistor for detecting clogging of scales after replacement may not be able to normally detect an increase in the temperature of the can body due to a defective construction of the thermistor for use.

  In this case, the error notification due to the initial failure or the construction failure is made after the predetermined number of times that the error is less than the abnormality reference value has been reached, for example, 10 times continuously determined every hour. In such a case, a long time of 10 hours is required when the error notification is configured.

  Therefore, after the maintenance man replaces the clogging clogging thermistor, the initial clogging of the clogging clogging detection thermistor and the installation failure cannot be noticed immediately, and the maintenance man must return to repair at a later date. There is.

  Accordingly, the present invention provides a control unit that determines that the temperature sensor is abnormal when the detection temperature of a predetermined temperature sensor such as a clogging clogging detection thermistor is determined to be outside the normal range a plurality of times. An object of the present invention is to quickly determine whether or not the temperature sensor is abnormal after the temperature sensor is replaced.

  In order to achieve the above object, the present invention takes the following technical means.

  That is, the present invention includes a temperature sensor that detects the temperature of a predetermined part and a control unit having a storage unit, and the control unit determines whether or not the temperature detected by the temperature sensor is outside a normal range. In the heat source machine that performs a predetermined error notification when the abnormality determination count number that is determined at each timing and is outside the normal range reaches a predetermined number of 2 or more, the control unit is configured so that the abnormality determination count number is the predetermined number of times. Is configured to store in the storage means abnormality information indicating that the temperature sensor is abnormal, and when the abnormality information is stored in the storage means, the abnormality is less than the predetermined number of times. The error notification is performed based on the determination count number (Claim 1).

  According to such a heat source device of the present invention, after the reset by turning on the power again or the like, if no abnormality information is stored in the storage means, the error determination count number of being out of the normal range will be an error until it reaches a predetermined number as usual. Do not broadcast. However, when the abnormality information is stored in the storage means when the abnormality determination count reaches a predetermined number during the previous operation, an error notification is issued with an abnormality determination count less than the predetermined number after reset (for example, once). Done. Therefore, after maintenance such as replacement of the temperature sensor, error notification is performed with an abnormality determination count number (for example, once) smaller than a predetermined number of times, and an initial failure or a construction failure of the replaced new temperature sensor can be detected quickly.

  Note that the predetermined timing may be, for example, every predetermined time (such as every hour), every time the combustion operation is started, or every hour when the combustion is started and when the combustion operation is continued. However, other appropriate ones may be used.

  In addition, the abnormality determination count number can be stored in a volatile memory such as a RAM or a CPU internal register. In this case, an operation for shutting off the power of the control unit, for example, an operation for unplugging the power outlet from the power plug, The abnormality determination count can be initialized by turning off the power switch. Of course, a reset switch for initializing the abnormality determination count number may be provided, and if the control unit initializes the abnormality determination count number by operating the reset switch, a rewritable nonvolatile memory such as an EEPROM is provided. It is also possible to store the abnormality determination count number in the memory.

  The storage means is preferably a rewritable nonvolatile memory such as an EEPROM, but a volatile memory such as a RAM may be used as long as it is backed up by a battery or the like. In addition, if the abnormality determination count number is initialized by operating the reset switch, and the design allows the abnormality information to be erased by turning off the power, the volatile memory can be stored without a backup power source. It can also be used as storage means.

  In addition, the abnormality information can be stored in the storage means as information different from the determination count number (for example, a flag that is 1 at the time of abnormality and 0 at the time of normality). It can also be stored in the storage means as the “abnormal information”. That is, the determination count number may be stored in the rewritable nonvolatile memory, and the time when the determination count number is equal to or greater than a predetermined number may be “when the abnormality information is stored in the storage unit”. Even in this case, since the memory of the judgment count number is not erased due to the power shutoff, if it is outside the normal range in the judgment of the detected temperature of the first temperature sensor at the first combustion operation at the first power on after the temperature sensor replacement, the previous operation is performed. Since the cumulative number of times of abnormality determination from the time has reached a predetermined number, the error notification is immediately performed when the determination count after the current power-on is one.

  In the heat source apparatus of the present invention, the control unit may delete the abnormality information from the storage unit when it is determined that the temperature detected by the temperature sensor is within a normal range at the predetermined timing ( Claim 2). According to this, when there is an initial failure or construction failure of a new temperature sensor that has been replaced, a control configuration that promptly notifies an error, but an abnormality occurs when the temperature detected by the temperature sensor is determined within the normal range. By erasing the information from the storage means, it is possible to prevent the error notification from being performed until the abnormality determination count number that is out of the normal range continuously reaches a predetermined number.

  Further, it is preferable that the control unit is configured to perform the error notification with one abnormality determination count when the abnormality information is stored in the storage means (claim 3). The initial failure and construction failure of the replaced new temperature sensor can be detected more quickly.

  Preferably, the controller is configured to initialize the abnormality determination count when it is determined that the temperature detected by the temperature sensor is within a normal range at the predetermined timing. According to this, error notification can be performed only when the abnormality determination that the detected temperature of the temperature sensor at a predetermined timing is outside the normal range is made a predetermined number of times continuously, due to various external factors. It is possible to avoid erroneous notification that the temperature sensor is abnormal.

  The heat source device may further include a combustion unit whose combustion operation is controlled by the control unit. In this case, the temperature sensor detects the temperature of a predetermined portion that changes in temperature by the combustion operation of the combustion section, and the control section performs the determination at the predetermined timing during the combustion operation of the combustion section. In addition, if the temperature detected by the temperature sensor during the combustion operation is within the temperature range during the non-combustion operation of the combustion section, it can be determined that it is outside the normal range. According to this, if the temperature of the part where the temperature rises without fail when the combustion operation is normal remains within the temperature range when the combustion operation is not performed (for example, less than 35 degrees), it is determined that it is out of the normal range. Thus, the abnormality of the temperature sensor can be detected more accurately and reliably.

  In addition, the heat source machine includes a combustion unit whose combustion operation is controlled by the control unit, a heat exchanger that heat-exchanges and heats water in a pipe using combustion gas generated by the combustion unit, the heat exchanger, and the heat exchanger A combustion can body that houses the combustion section may be further provided. In this case, the temperature sensor is a thermite clogging detection thermistor, and the pipe of the heat exchanger is configured to have a plurality of stages in the vertical direction and configured to pass water from the lower stage side to the upper stage side. The stone clogging detection thermistor may be attached to the outer surface of the combustion can body on the side near the downstream end of the lowermost pipe (Claim 6). According to this, since the abnormality of the temperature sensor (thermistor for detecting clogging of scale stone) is judged based on the temperature of the part where the temperature rises most due to clogging of scale stone, the influence of external factors is minimized and more accurate and reliable. It is possible to detect abnormalities in the temperature sensor.

  As described above, according to the present invention, it is possible to quickly determine whether or not the temperature sensor is abnormal after maintenance of the temperature sensor, and at the normal time, the error is detected until the abnormality determination count number reaches a predetermined number or more. Misreporting can be reduced by not performing reporting.

It is a simplified front view of the heat source machine which concerns on one Embodiment of this invention. It is the perspective view seen from the back side which shows the attachment structure of the primary heat exchanger of the same heat source machine, and the scale clogging detection thermistor. It is a flowchart of the abnormality detection determination process of the thermite clogging thermistor in the same heat source machine. It is a flowchart of the temperature sensor diagnostic process in the flowchart of FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 shows a latent heat recovery type high-efficiency hot water supply apparatus as a heat source apparatus according to an embodiment of the present invention. The hot water supply apparatus includes a combustion can body 2 and a hot water supply circuit 3 incorporated in a housing 1. ing. Inside the can body 2, a combustion section 4 that generates combustion gas, a primary heat exchanger 5 disposed above the combustion section 4, and a secondary heat disposed further above the primary heat exchanger 5. An exchanger 6 (condensation heat exchanger) is provided. A blower fan 7 that supplies combustion air to the combustion unit 4 is disposed below the combustion unit 4.

  The combustion part 4 is divided into four combustion regions in the illustrated example, and each combustion region is formed by a plurality of burners. As shown in FIG. 2, each burner has a slot-shaped flame opening, and the flame opening extends in the front-rear direction. A gas supply pipe 8 that supplies fuel gas as combustion fuel from the fuel gas supply source side is connected to each combustion region. The gas supply pipe 8 is provided with an original gas electromagnetic valve 9 as a main plug and a gas proportional valve 10 for adjusting the gas supply amount in order from the fuel gas supply source side. A gas supply pipe 8 is branched for each combustion region on the downstream side of the gas proportional valve 10. The first to fourth capacity switching valves SV1 to SV4 are individually provided corresponding to each combustion area, and the supply of fuel gas to each combustion area is individually performed by opening and closing each capacity switching valve SV1 to SV4. Can be controlled. The fuel gas supplied to each combustion region is supplied to each burner via a gas passage provided for each burner, and the fuel gas and combustion air are mixed in the burner, and the mixed gas burns. Combustion gas is generated.

  As a result, as shown in FIG. 2, the size of the combustion region of the combustion section 4 is reduced to a plurality of capability stages (in the illustrated example, only the first combustion region is controlled) by selective opening / closing control of the four capability switching valves SV1 to SV4. 1 stage for burning, 2 stages for burning only the second combustion area, 3 stages for burning the 1st and 2nd combustion areas, 4 stages for burning the 1st to 3rd combustion areas, 1st and 4th 6 stages, including 5 stages for burning the combustion area and 6 stages for burning all of the 1st to 4th combustion areas, in FIG. In addition, the amount of combustion heat (number of hot water supply) is adjusted for each capacity stage by adjusting the amount of fuel gas supplied at each capacity stage by controlling the opening of the gas proportional valve 10. Is configured to be changeable within a predetermined range. The combustion heat quantity on the large combustion side of the capacity stage number on the lower stage side of the adjacent stage number and the combustion heat quantity on the small combustion side of the capacity stage number on the upper stage are overlapped, whereby the combustion heat quantity of the entire combustion unit 4 is changed to the first combustion. From the minimum combustion heat amount (for example, No. 3 in terms of the number of hot water supply) that burns only the region with the minimum combustion capacity of the burner, the maximum combustion heat amount (for example, the hot water supply number) that burns all of the first to fourth combustion regions with the maximum combustion capacity The number can be changed continuously up to 24).

  The primary heat exchanger 5 recovers the sensible heat of the combustion gas generated in the combustion unit 4, and the secondary heat exchanger 6 is the thermal energy of the combustion gas that cannot be recovered in the primary heat exchanger 5, that is, This is for recovering the latent heat and preheating the hot water before heating in the primary heat exchanger 5.

  As shown in FIG. 2, the primary heat exchanger 5 includes a water flow pipe 5a and a large number of plate fins 5b provided on the surface of the water flow pipe 5a. The water flow pipe 5a includes a lower step portion formed by connecting a plurality of straight pipe portions C arranged in parallel in the front-rear direction and a plurality of straight pipe portions arranged in parallel in the front-rear direction above the lower step portion. The upper stage is formed by connecting upper and lower portions in a meandering manner, and the downstream end of the lower stage and the upstream end of the upper stage are connected. Each straight pipe portion C extends in the left-right direction, and all the straight pipe portions C are through-connected to each plate fin 5b. A large number of plate fins 5b are aligned and arranged with a slight gap in the left-right direction, and the back side edges of the large number of plate fins 5b are in contact with the back side plate 2a of the combustion can body 2, preferably It is fixed by welding.

  A scale clogging detection thermistor 13 is detachably attached and fixed to the outer side surface of the back side plate 2a of the combustion can body 2 via a mounting base 12. In particular, in the present embodiment, as shown in FIGS. 1 and 2, the downstream side end of the water flow pipe 5 a of the primary heat exchanger 5, which is on the back side of the water flow pipe 5 a at the lower stage part. A thermistor 13 is provided in the vicinity of the part. Further, in the present embodiment, the thermistor 13 is provided above the second combustion region (region corresponding to the second capacity switching valve SV2) of the combustion unit 4. This is because the second combustion region is the most frequently used combustion region in the actual hot water supply operation and the highest frequency of receiving the largest amount of heat from the combustion unit 4 during the combustion operation.

  The hot water supply circuit 3 includes a water inlet 31 for allowing tap water received from the water supply connection port to enter the secondary heat exchanger 6, and hot water heat-exchanged and heated by the secondary heat exchanger 6 and the primary heat exchanger 5. And a bypass passage 33 that branches from the water inlet 31 and supplies cold water to the hot water outlet 32. A bypass flow rate control valve 34 is provided in the bypass passage 33, and the temperature of discharged hot water can be controlled by adjusting the bypass flow rate via the bypass passage 33. A can body flow rate sensor 35 and an incoming water temperature sensor (incoming water thermistor) 36 are provided in the incoming water passage 31 at a downstream side of the branching portion to the bypass passage 33. A hot water temperature sensor (can body thermistor) 37 and a can body flow rate control valve 38 are provided in the hot water path 32 upstream of the junction with the bypass passage 33. In addition, a tapping temperature sensor (a tapping thermistor) 39 is provided in the tapping channel 32 on the downstream side of the junction with the bypass channel 33.

  An exhaust temperature sensor (exhaust thermistor) 14 is provided in the vicinity of the exhaust port of the can body 2. An ignition plug 15 and a frame rod (extinguishing safety device) 16 are provided on the combustion can body 2 above the combustion unit 4. In the housing 1, an ambient temperature sensor 17 is provided at an appropriate location. A drain collection tray 61 that collects condensed water as drain is provided below the secondary heat exchanger 6, and the collected drain is neutralized by the neutralization device 62 and then drained.

  Control objects such as the blower fan 7, the capacity switching valves SV <b> 1 to SV <b> 4, the original gas solenoid valve 9, the gas proportional valve 10, the bypass flow rate control valve 34 and the can body flow rate control valve 38 are controlled in the housing 1. Controlled by the unit 18. During the hot water supply operation, the control unit 18 obtains the detected values from the sensors 14, 17, 35, 36, 37, and 39, and determines the required amount of combustion heat based on these detected values and the required hot water supply capacity. In addition, the capacity of the combustion section 4 and the opening of the proportional valve 10 are controlled so as to obtain the required amount of combustion heat, and the can body flow rate control valve 38 and the bypass flow rate control valve are obtained so as to obtain the required hot water temperature. 34 is controlled.

  The control unit 18 includes a microprocessor 18a as a control center and a rewritable nonvolatile memory 18b (storage means) such as an EEPROM. A RAM or ROM may be provided separately.

  The control unit 18 of the present embodiment performs primary heat exchange based on the can body temperature (detected temperature) detected by the clogging clogging detection thermistor 13 during hot water supply operation (combustion operation) or immediately after hot water supply operation (immediately after the end of combustion). It is comprised so that the process which detects the clogging of the scale in the water flow piping 5a of the vessel 5 may be performed. Such a clogged clog detection process may be appropriate. For example, as disclosed in Patent Document 1, a clogged clog can be diagnosed based on the detected temperature rise of the thermistor 13 after the hot water supply operation is stopped. When the detected temperature of the thermistor 13 exceeds a predetermined threshold value while no other abnormality is detected during the hot water supply operation, it can be diagnosed as clogged clogs, or clogged clogs by other appropriate methods. Can be diagnosed.

  The feature of the present embodiment is that the determination of whether or not the clogging clogging detection thermistor 13 is in a state in which the can body temperature can be normally detected is made, so that the clogging clogging detection thermistor 13 is faulty or defective. It is a point to do.

  Hereinafter, the characteristic configuration of the present embodiment will be described. In the microprocessor 18a of the control unit 18, the temperature detected by the thermistor 13 for detecting clogging of the scale is less than 35 degrees (normal) during hot water supply operation (combustion operation control). It is configured to perform the determination process (temperature sensor diagnosis) as to whether or not it is out of range immediately after the start of the combustion operation of the combustion unit 4 and every hour of the combustion operation. The EEPROM 18b of the control unit 18 is configured to store the sensor abnormality information when it is determined that there is a temperature sensor abnormality such as an open failure or poor construction of the scale clogging detection thermistor 13. Yes.

  FIG. 3 shows an example of a flowchart of such processing. When the power supply of the control unit 18 is turned on by connecting the power outlet 19 to a power plug (not shown), an abnormality number counter (abnormality determination count number) is initialized. And stored in a storage means such as a RAM (step S1), and waits until a combustion start condition such as an operation start operation is established (step S2). Note that when storing the abnormal number counter in the volatile memory, the information stored when the power is turned off is erased and initialized. Therefore, the initialization process in step S1 is not necessarily required. It is preferable to perform the initialization process in step S1.

  When the combustion start condition is satisfied, the control unit 18 opens the original gas solenoid valve 9, the gas proportional valve 10, and the capacity switching valves SV1 to SV4 and operates the ignition plug 15 to start the combustion operation of the combustion unit 4. In step S3, the opening degree of the gas proportional valve 10, the capacity switching valves SV1 to SV4, the bypass flow control valve 34, and the can flow control valve 38 is controlled according to the required hot water supply number and the required hot water temperature.

  Immediately after the start of the combustion operation and after a time estimated that the can body temperature of the combustion can body 2 has risen to some extent (for example, 30 seconds after the start of combustion), the clogging clogging thermistor 13 is detected. The temperature sensor diagnosis process is performed (step S4).

  Next, when a predetermined combustion end condition such as an operation end operation is established, a predetermined combustion end process such as closing the original gas solenoid valve 9, the gas proportional valve 10, and the capacity switching valves SV1 to SV4 is performed. Perform (step S7), and return to step S2.

  When the combustion operation continues for one hour from the previous temperature sensor diagnosis time (step S6), the process returns to step S4 again. In this embodiment, the temperature sensor of the clogging detection thermistor 13 every one hour of combustion continuation. It is configured to perform diagnostic processing.

  FIG. 4 shows an example of a flowchart of the temperature sensor diagnostic process. When the diagnostic process starts, first, the control unit 18 acquires the detection temperature T of the thermistor 13 (temperature sensor) for detecting clogging of scale stone (step S8). When the detection temperature T is acquired, if the second capacity switching valve SV2 of the combustion unit 4 (capacity switching valve corresponding to the position where the clogging clogging detection thermistor 13 is provided) is closed, the detection temperature Before the T acquisition process, the second capacity switching valve SV2 can be temporarily opened to burn the second combustion region.

  Next, it is determined whether or not the detected temperature T is outside the normal range (abnormal value) (step S9). Such determination conditions may be appropriate. For example, when the detected temperature T is less than 35 ° C. (within the temperature range when the combustion unit 4 is not combusting), it is determined that the temperature is outside the normal range, and 35 ° C. If it is above (outside the temperature range when the combustion part 4 is not combusting), it can be determined that it is within the normal range.

  If it is determined in step S9 that the detected temperature T is within the normal range, the abnormality determination count number (number of abnormalities) is initialized (step S10), and the sensor abnormality information is erased from the EEPROM 18b (step S11). Ends temperature sensor diagnosis and returns. As described above, when the detected temperature T is determined to be within the normal range, the abnormality determination count number and the sensor abnormality information are cleared, so that the detected temperature T is abnormal in a predetermined number of temperature sensor diagnoses. Only when it is determined, it can be determined that the clogging clogging detection thermistor 13 is abnormal, and erroneous determination due to various external factors can be prevented.

  When it is determined in step S9 that the detected temperature T is outside the normal range (abnormal value), the abnormality determination count number (abnormal number) is incremented (step S12), and whether or not failure information is stored in the EEPROM 18b. If failure information is not stored, it is next determined whether or not the abnormality determination count number (abnormal number) is a predetermined number (for example, 10 times) or more (step S14). If it is less than the predetermined number of times, the temperature sensor diagnosis is terminated and the process returns. If the predetermined number of times is exceeded, the sensor abnormality information is stored in the EEPROM 18b (step S15), and the fact that the scale clogging detection thermistor 13 is abnormal is notified by appropriate notification means such as a screen display or an alarm sound (step S16). ) Stops the combustion operation and terminates abnormally.

  Further, if failure information is stored in the EEPROM 18b in step S13, the control is configured to skip the steps S14 and S15 and immediately perform the abnormality notification process (step S16).

  It is preferable to configure the control so that the operation start operation cannot be performed after the abnormal end. However, the abnormality notification is reset and the operation start operation can be accepted by turning the power off and turning it on again. It can be configured to control.

  After such restart, the abnormality determination count is initialized, but the failure information is not initialized because it is stored in the EEPROM 18b. Accordingly, after the maintenance man has performed the replacement work of the scale clogging detection thermistor 13 in response to the abnormality notification, the abnormality notification state is canceled by a simple operation of turning on the power again. It can be in a state where driving operation can be started. Further, according to the present embodiment, when the thermistor 13 is replaced after the abnormality is notified and the power is turned on again, if the can body temperature cannot be obtained correctly due to the initial failure or construction failure of the thermistor 13, the combustion starts. If it is once determined that the detected temperature T is an abnormal value in the immediately following temperature sensor diagnosis, the failure information is stored in the EEPROM 18b, so that an abnormality is immediately notified (step S16). Whether or not the thermistor 13 is normal can be quickly confirmed.

  In addition, this invention is not limited to the said embodiment, A design change can be carried out suitably. For example, although the hot water supply device is exemplified as the heat source device in the above embodiment, the present invention can be applied to a heat source device that circulates and heats a heating heat medium and other appropriate heat source devices.

  In the above embodiment, the abnormality determination count number is stored in a volatile memory such as a RAM, and the temperature sensor failure information is stored in a rewritable nonvolatile memory such as an EEPROM. However, the abnormality determination count number can be rewritten. By storing in the non-volatile memory and deleting steps S1, S11, S13, and S15, the temperature sensor sensed temperature T is an abnormal value at the start of the first combustion after the temperature sensor replacement operation is performed. If so, it is possible to immediately notify the abnormality.

  In the above embodiment, the abnormality determination of the clogging clogging detection thermistor is performed. However, the present invention can be applied to abnormality determination of an appropriate temperature sensor such as the ambient temperature sensor 17 that is easily affected by external factors.

  Further, in determining whether the detection value of the temperature sensor is within the normal range or the abnormal value (step S9), it is not determined based on only one detection value, for example, a predetermined time interval (several nanoseconds to several nanoseconds) Appropriate noise processing, such as determination based on the average value of a plurality of detection values acquired at intervals of several minutes) or the average value of detection values of a plurality of temperature sensors, can be performed.

2 Combustion can body 4 Combustion section 5 Heat exchanger (primary heat exchanger)
5a Water pipe 13 Thermistor for detecting clogging of stone (temperature sensor)
18 Control unit 18b EEPROM (storage means)

Claims (6)

A temperature sensor that detects a temperature of a predetermined part; and a control unit that includes a storage unit. The control unit determines whether or not the temperature detected by the temperature sensor is out of a normal range at a predetermined timing and is normal In the heat source machine that performs a predetermined error notification when the abnormality determination count number that is out of range reaches a predetermined number of times of 2 or more,
The control unit is configured to store abnormality information indicating that the temperature sensor is abnormal in the storage unit when the abnormality determination count reaches the predetermined number, and the abnormality information is stored in the storage unit. When stored, the heat source unit is configured to perform the error notification with the abnormality determination count less than the predetermined number of times.   The heat source apparatus according to claim 1, wherein the control unit erases the abnormality information from the storage unit when it is determined that the temperature detected by the temperature sensor is within a normal range at the predetermined timing. Heat source machine.   3. The heat source according to claim 1, wherein the control unit performs the error notification with one abnormality determination count when the abnormality information is stored in the storage unit. Machine.   4. The heat source device according to claim 1, wherein the control unit initializes the abnormality determination count when it is determined that the temperature detected by the temperature sensor is within a normal range at the predetermined timing. A heat source machine characterized by that.   The heat source apparatus according to any one of claims 1 to 4, further comprising a combustion unit whose combustion operation is controlled by the control unit, wherein the temperature sensor detects a temperature of a predetermined portion that changes in temperature by the combustion operation of the combustion unit. The control unit performs the determination at the predetermined timing during the combustion operation of the combustion unit, and the temperature detected by the temperature sensor during the combustion operation is a temperature during the non-combustion operation of the combustion unit. A heat source machine characterized in that if it is within the range, it is determined that it is outside the normal range.   A combustion section whose combustion operation is controlled by the control section, a heat exchanger that heat-exchanges and heats water in a pipe using combustion gas generated by the combustion section, and a combustion can that houses the heat exchanger and the combustion section The heat source apparatus according to any one of claims 1 to 4, further comprising a body, wherein the temperature sensor is a thermite clogging detection thermistor, and a pipe of the heat exchanger is configured in a plurality of stages in the vertical direction and a lower stage. The canister clogging detection thermistor is attached to the outer surface of the combustion can body at the side near the downstream end of the lowermost pipe. A heat source machine characterized by that.

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