JP4041035B2 - Hot water circulation heat source machine - Google Patents

Description

  The present invention relates to a hot water circulation type heat source device that performs temperature control by circulating hot water.

  2. Description of the Related Art Conventionally, there is known a hot water circulation type heat source machine that has a hot water supply function and that can raise the temperature of hot water in a bathtub by circulating hot water. A heat exchanger using a burner as a heat source is provided in the gas water heater of this hot water circulation heat source machine, and the hot water circulated in the circulation path by a circulation pump (bath pump) passes through the heat exchanger by the burner. Heated and supplied to the bathtub. And the warm water in a bathtub is attracted | sucked by the bath pump, and is recirculated | refluxed to the said heat exchanger.

  Further, in addition to the hot water supply and reheating functions, there is also known one that regulates temperature by circulating hot water to a heater. In this hot water circulation heat source machine, the hot water circulated by the circulation pump (heating pump) is heated via the heat exchanger by the burner separately from the circulation route through the bathtub and becomes the primary hot water circulation route (outward) To be supplied. This primary hot water is sucked into the heating pump after the temper- ing air of the hot air heater is raised and then enters a sys- tem through a circulation path (return path). The condensate discharged from the heating pump returns to the heat exchanger, but a part of the condensate is diverted as secondary hot water and used to raise the temperature of the floor heating panel, and passes through the same return path as the primary hot water. Join the Sistern. In order to use only the floor heating panel, the circulation path is provided with a bypass pipe that returns the primary hot water to the warm air heater without returning to the warm pump.

  In this type of hot water circulation type heat source machine, there is a possibility that the circulation path may be blocked due to freezing or the like, and in particular, the bypass pipe has a smaller diameter than other circulation paths, and thus is easily frozen. Therefore, the conventional hot water circulation type heat source device has taken preventive measures to prevent the circulation path from freezing, for example, by installing a freeze prevention heater for heating the circulation path (see, for example, Patent Document 1). .

  If the hot water circulation heat source machine is operated in a state where the circulation path is frozen and the circulation path is blocked, the burner continues to heat the heat exchanger even if hot water is not circulating in the circulation path. For this reason, the heat exchanger overheats due to air boiling or boiling, but the hot water circulation heat source machine is forcibly stopped by operating the safety device that detects this. Therefore, although the damage caused by the operation in the closed state of the circulation path is designed to be small, there is a problem that the damage cannot be completely prevented.

  For example, the following cases can be assumed that the freezing of the circulation path occurs while taking anti-freezing measures as described above. That is, for example, after a hot water circulation heat source machine is newly installed in a cold region and the trial operation is performed, the water is not completely drained and the user does not use it immediately. For example, when AC100V) is turned off. In such a case, since the main power supply is turned off, the antifreezing heater does not operate and the water remaining in the circulation path is frozen.

It is assumed that the possibility of freezing of the circulation path in this way is low in normal use, but it is desired to cope with the situation in which the above-mentioned heat exchanger malfunction occurs. Yes. Therefore, in order to know whether or not the circulation path is blocked by freezing or the like, it may be possible to newly install a water flow switch in the circulation path, but using parts such as the water flow switch increases the cost. I need it.
Japanese Patent Laid-Open No. 9-229477

  The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a hot water circulation heat source device that can prevent damage to the device at low cost when the circuit is started in a closed state. To do.

  Another object of the present invention is to provide a hot water circulation heat source that can continue operation even when the circuit is started in a frozen state.

  In order to achieve the above object, the present inventors have made various studies. The inventors of the present application reduce the load on the motor that drives the circulation pump in a state where the degree of blockage of the hot water circulation path has progressed, and as a result, in such a state, if the motor speed is the same, the motor It has been found that the current is smaller than normal. That is, the motor current value corresponding to the predetermined number of revolutions of the motor in a state where the degree of blockage of the circulation path proceeds and the operation of the hot air heater or the floor heating panel is hindered is stored in advance as a reference value. If the motor current when the motor is controlled to actually rotate at the predetermined number of rotations is less than the reference value, the load on the motor is reduced at this time, that is, the circulation path is closed.

Therefore, the hot water circulation type heat source apparatus of the present invention is a hot water circulation type having a burner, a hot water circulation path provided with a heat exchanger heated by the burner, and a circulation pump for circulating hot water in the circulation path. Before operating the burner, the heat source machine rotates the motor that drives the circulation pump at a predetermined number of revolutions. At this time, the current value that flows through the motor and whether the circulation path is closed or not Control means for prohibiting the operation of the burner when the current value is smaller than the reference value, and temperature detecting means for detecting the temperature of the circulation path or the outside air temperature. The control means determines whether the cause of the blockage is freezing based on the temperature detected by the temperature detection means when the current value is smaller than the reference value, and displays the determination result on the display means. characterized in that the display To.

  According to the present invention, when the circulation path is blocked, this can be determined based on the current value of the motor, and the operation of the burner can be prohibited. Therefore, the heat exchanger is not heated by the burner and does not suffer damage such as overheating. Therefore, even if the circuit is started with the circuit closed, it is possible to prevent damage to the apparatus without providing a special sensor such as a water flow sensor.

Furthermore, according to the present invention, it is possible to notify that the abnormality of freezing has occurred based on the temperature detected by the temperature detection means, and the user can quickly cope with the abnormality.

  Further, the hot water circulation heat source apparatus of the present invention is provided with a heater in the circulation path, and the control means energizes the heater when it is determined that the cause of the blockage of the circulation path is freezing. Also good.

  According to the present invention, when it is determined by the control unit that the circulation path is frozen, the circulation path is thawed by the heater and the cause of the blockage of the circulation path can be removed. Therefore, it is not necessary to notify the supplier when the circulation path is frozen, and the usability is improved.

  Further, in the hot water circulation heat source apparatus according to the present invention, the control means rotates the motor at a predetermined rotational speed after a predetermined time from energizing the heater, and the current value flowing through the motor and the reference value at this time And the prohibition of the operation of the burner may be canceled when the current value is equal to or greater than the reference value.

  According to the present invention, when the blockage caused by the freezing of the circulation path is resolved by the heating of the heater, the operation prohibition of the burner is released. Therefore, even if the circuit is started in a frozen state, the operation can be continued reliably.

  Next, an example of an embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a configuration diagram of a hot water circulation heat source apparatus according to an embodiment of the present invention, FIG. 2 is a flowchart showing a heating process by the apparatus shown in FIG. 1, and FIG. 3 is a flowchart showing a blockage coping process by the apparatus shown in FIG. is there.

  Referring to FIG. 1, hot water circulation type heat source unit 1 in the present embodiment is connected to bathtub 4 by bath connection pipes 2 and 3 that form a hot water circulation path, and a hot water circulation path for heating. Are connected to the warm air heater 7 and the floor heating panel 10 (three in the figure) by the floor heating connection pipes 8 and 9, respectively.

  The hot water circulation heat source unit 1 is entirely controlled by a controller 11 and includes a hot water supply means 12, a heating means 13, and a reheating means 14. In addition, the user can give an operation instruction to the hot water circulation heat source unit 1 by the remote controller 15 connected to the controller 11.

  The controller 11 is constituted by an electronic circuit such as a microcomputer, a memory, an I / O unit, and the like, and according to the contents of various operation operations instructed by the remote controller 15, the hot water supply means 12, the heating means 13, and the reheating means 14. Take control. Moreover, the controller 11 performs the blockage countermeasure process of a warm water circulation path so that it may mention later.

  The hot water supply means 12 is connected to a hot water supply heat exchanger 22 that is heated by a hot water supply burner 21 that operates according to a control signal from the controller 11, a water supply pipe 23 that is connected to a water pipe (not shown) and supplies water to the hot water supply heat exchanger 22, and a water supply pipe 23. A water amount sensor 24 that detects the flow rate of the feed water from the water supply and outputs it to the controller 11; a hot water pipe 25 from which hot water heated by the hot water supply heat exchanger 22 is discharged; a water tap 26 for draining water from the hot water pipe 25; From the hot water supply pipe 27 branched from the pipe 25 and connected to the bathtub 4 through a bath circulation circuit 72 described later, the hot water temperature sensor 28 for detecting the temperature of the hot water in the hot water discharge pipe 25 and outputting it to the controller 11, from the controller 11 A solenoid valve 29 that opens and closes the hot water filling pipe 27 according to the control signal, and a hot water sensor that detects the flow rate of the hot water flowing from the hot water filling pipe 27 to the bathtub 4 and outputs it to the controller 11. 0, and a water level sensor 31 for detecting the hydrostatic pressure of the water level in the bathtub 4.

  In addition, the downstream end part of the hot water discharge pipe 25 is connected to a hot water tap (not shown) such as a kitchen, for example. In addition, an overheat switch 32 is disposed at a predetermined position of the hot water supply heat exchanger 22, and a control is performed to extinguish the hot water supply burner 21 by opening a bimetallic contact when the disposed portion is overheated.

  In the hot water supply means 12, when the user operates the remote controller 15 to give a hot water filling instruction to the bathtub 4, the controller 11 opens the hot water solenoid valve 29. By opening the pouring electromagnetic valve 29, water supply from the water supply pipe 23 to the hot water supply heat exchanger 22 is started, and flowing water is detected by the water amount sensor 24. The controller 11 operates the hot water supply burner 21 in response to detection of running water by the water amount sensor 24. That is, the hot water supply fan 33 is operated, and a high voltage is applied to the hot water spark plug 39 via the igniter 38 to cause spark discharge, thereby opening the original solenoid valve 34, the hot water proportional valve 35, and the hot water solenoid valves 36 and 37. The hot water burner 21 is ignited.

  Next, after the controller 11 confirms the ignition of the hot water supply burner 21 by the hot water supply frame rod 40, the hot water supply temperature to the bathtub 4 detected by the hot water supply temperature sensor 28 becomes the hot water supply hot water temperature set by the remote controller 15. Then, the rotation speed of the hot water supply fan 33 is controlled to adjust the amount of combustion air supplied to the hot water supply burner 21, and the hot water proportional valve 35 and the hot water supply electromagnetic valves 36 and 37 are controlled to supply fuel gas to the hot water supply burner 21. Adjust the amount. Thereby, the hot water at the hot water supply temperature is supplied to the bathtub 4 through the hot water tube 27. Then, the controller 11 closes the hot water solenoid valve 29 and supplies hot water to the bathtub 4 when the water level of the hot water in the bathtub 4 becomes equal to or higher than the target water level set by the remote controller 15 by the water level sensor 31. The combustion of the hot water supply burner 21 is stopped and the hot water filling is finished.

  Next, the heating means 13 heats the hot water heated by the heating heat exchanger 42 that is heated by the heating burner 41 that operates according to the control signal from the controller 11, and the hot water that is heated by the heating heat exchanger 42 by the control signal from the controller 11. A heating pump 44 as a circulation pump that circulates in the circulation circuit 43, a heating temperature sensor 45 that detects a tapping temperature from the heating heat exchanger 42, a systern 46 that absorbs expansion and contraction of hot water in the heating circulation circuit 43, and a water supply pipe 23, a water replenishing pipe 47 for replenishing water to the cistern 46, and a water replenishing electromagnetic valve 48 opened and closed by a control signal from the controller 11.

  The motor M that drives the heating pump 44 is feedback-controlled by the controller 11 so as to rotate at a predetermined rotational speed. In addition, an overflow pipe 49 is provided at the upper part of the side surface of the cistern 46 so that the inside of the cistern 46 is opened to the atmosphere, and a certain amount or more of warm water is discharged.

  In the heating means 13, when the user operates the remote controller 15 to give an operation instruction for the hot air heater 7, the controller 11 uses the low water level electrode 50 and the high water level electrode 51 provided in the cistern 46. By detecting the water level of the cistern 46, it is confirmed whether or not the heating circulation circuit 43 is filled with water. When the heating circulation circuit 43 is not filled with water, the supplementary water solenoid valve 48 is opened. Then, water is replenished from the water supply pipe 23 into the heating circulation circuit 43 through the water replenishment pipe 47. The controller 11 opens the thermal valve (not shown) of the hot air heater 7 and activates the heating pump 44 in a state where the heating circulation circuit 43 is filled with water. Next, the heating fan 52 is operated, a high voltage is applied to the heating spark plug 55 via the igniter 38 to cause spark discharge, the heating proportional valve 53 and the heating electromagnetic valve 54 are opened, and the heating burner 41 is ignited. To do.

  Next, after confirming ignition of the heating burner 41 by the heating frame rod 56, the controller 11 heats the heating fan 52 so that the hot water supply temperature to the heating circulation circuit 43 detected by the heating temperature sensor 45 becomes a predetermined heating hot water supply temperature. The amount of combustion air supplied to the heating burner 41 is adjusted, and the heating proportional valve 53 and the heating electromagnetic valve 54 are controlled to adjust the amount of fuel gas supplied to the heating burner 41. Thus, hot water at the heating hot water supply temperature is continuously sent to the hot air heater 7 through the heating circulation circuit 43 having the hot air heating connection pipes 5 and 6 as a part of the configuration.

  Further, the controller 11 opens the floor warming valve 58 when the user operates the remote controller 15 to give an operation instruction for the floor heating panel 10. By opening the floor warming valve 58, the floor heating branch pipe 60 branched from the heating circulation circuit 43 is communicated with the floor heating connection pipe 8 and communicated with the heating circulation circuit 43. Thereby, warm water returning from the warm air heater 7 is supplied to the floor heating panel 10.

  The heating circulation circuit 43 is provided with a bypass pipe 61 that returns the warm water (primary warm water) heated by the heating heat exchanger 42 to the heating pump 44 via the systern 46 without supplying the warm air to the warm air heater 7. Therefore, only the floor heating panel 10 can be heated. At this time, the condensate that has passed through the floor heating panel 10 is mixed by the cistern 46 together with hot water supplied from the heating heat exchanger 42 via the bypass pipe 61, and flows from the outflow side of the cistern 46 to the inflow side of the heating pump 44. The floor heating panel 10 is heated by the mixed hot water after being refluxed.

  The heating means 13 is provided with an outside air temperature thermistor 62 that detects the outside air temperature in the vicinity of the suction port of the heating fan 52. A bypass pipe 61 that has a smaller diameter and is more likely to freeze than other circulation paths will be described later. There is provided a thawing heater 63 that is operated when freezing. The installation position and the number of installation of the thawing heater 63 can be arbitrarily selected. Further, an overheat switch 32 is disposed at a predetermined position of the heating heat exchanger 40, and when the disposed portion is overheated, a bimetal contact is opened and control is performed to extinguish the heating burner 41. ing.

  Next, the reheating means 14 retraces from the reheating heat exchanger 70 and the heating heat exchanger 42 that perform a liquid-liquid heat exchanging operation with hot water supplied from the heating heat exchanger 42 via the heating circulation circuit 43. A bath heat valve 71 for switching start and stop of hot water supply to the heat exchanger 70, a bath circulation circuit 72 having the bath connection pipes 2 and 3 as a part of the structure, and hot water in the bathtub 4 via the bath circulation circuit 72 A bath pump 73 as a circulation pump to be circulated, a bath temperature sensor 74 for detecting the temperature of hot water in the bath circulation circuit 72, and a bath water flow switch 75 for detecting the presence or absence of running water in the bath circulation circuit 72 are provided.

  In the reheating means 14, when the user operates the remote controller 15 to give an operation instruction for reheating to increase the temperature of the hot water in the bathtub 4, the controller 11 is in a state where the hot water solenoid valve 29 is closed. The hot water in the bathtub 4 is circulated through the bath circulation circuit 72 by operating the bath pump 73. That is, the controller 11 opens the bath heat valve 71 and ignites the heating burner 41 in the same manner as when the heating means 13 is driven, and the amount of combustion in the heating burner 41 is detected by the heating temperature sensor 45. The heating pump 44 is operated by adjusting the temperature of the hot water discharged from the heating heat exchanger 42 to a predetermined reheating hot water supply temperature. As a result, the hot water at the additional hot water supply temperature is continuously sent to the additional heat exchanger 70.

  In this state, the controller 11 operates the bath pump 73 to circulate hot water in the bathtub 4 in the bath circulation circuit 72 and circulate it through the heat exchanger 70, thereby raising the temperature of the hot water in the bathtub 4. Then, the controller 11 stops the operation of the heating burner 41, the bath pump 73, and the heating pump 44 when the temperature of the hot water detected by the bath temperature sensor 74 reaches the reheating target temperature set by the remote controller 15. Then, the bath heat valve 71 is closed to end the chasing.

  Next, the heating process when the user uses the hot water circulation heat source unit 1 having the above configuration for the first time and uses it for the first time will be described. In this case, it is assumed that the supplier performs a trial operation of the hot water circulation type heat source device 1 in advance and turns off the main power supply (AC 100 V) after draining water.

  Referring to the flowchart shown in FIG. 2, the user first turns on a main power source and a heating switch (floor heating) (not shown) provided in remote controller 15. When this ON operation is performed (step S1), the controller 11 opens the water supplement electromagnetic valve 48 and starts water supply from the water supply pipe 23 to the heating circulation circuit 43 via the water supplement pipe 47 (step S2).

  Then, the controller 11 detects whether or not the heating circulation circuit 43 is filled with water based on the output signals from the low water level electrode 50 and the high water level electrode 51 provided in the cistern 46 (step S3). When the water is full, the water replenishing electromagnetic valve 48 is closed to end the water supply to the heating circulation circuit 43 (step S4).

  Next, the controller 11 performs blockage countermeasure processing described later (step S5). As a result of this blockage coping process, it is determined whether or not it can be operated (step S6). When it is determined that it can be operated, the floor warming valve 58 is opened and the heating pump 44 is driven (step S7). Next, the heating fan 52 is operated and the heating burner 41 is operated (step S8), and the heating fan 52 is controlled according to the amount of combustion of the heating burner 41. Then, when the operation stop switch (not shown) is turned on (step S9), the operation is stopped (step S10), and the process is terminated. If it is determined in step S6 that driving is not possible, the process proceeds to step S10 and the process is terminated.

  In the above heating process, floor heating has been described. In response to the operation of the remote controller 15, the controller 11 opens a thermal valve (not shown) of the hot air heater 7 in step S7 to drive the heating pump 44. If it does so, the heating process by the warm air heater 7 can be performed similarly, and also both the floor heating panel 10 and the warm air heater 7 can be operated.

  Next, the blockage coping process in step S5 will be described with reference to the flowchart shown in FIG. In this blockage coping process, first, the controller 11 rotates the motor M that drives the heating pump 44 at a predetermined number of revolutions (step S11). This predetermined number of revolutions is experimental and may be smaller than usual.

  Then, the controller 11 compares the current value (motor current value) that actually flows through the motor M when the motor M is rotated at the predetermined rotational speed with a reference value stored in advance in the memory (step S12). ) When the motor current value is less than or equal to the reference value, the operation of the heating burner 41 is prohibited (step S13). The reference value is the current flowing through the motor M when the motor M rotates at the predetermined rotation speed and the degree of blockage of the circulation path is at a level that hinders the operation of the hot air heater 7 and the floor heating panel 10. It has been sought as a standard. The motor current value decreases as the degree of blockage of the circulation path increases, and the circuit is blocked when the motor current value is equal to or less than the reference value.

  Following step S13, the controller 11 compares the detected temperature detected by the outside air temperature thermistor 62 with a predetermined temperature (eg, 3 ° C.) (step S14). On the screen (display means) (not shown) of the remote controller 15 as a display corresponding to the freezing, for example, “Preparing for operation. Please wait for a while” or the user refers to the manual. The error display “E01” or the like is displayed (step S15).

  Following step S15, the controller 11 energizes and operates the thawing heater 63 (step S16), and then resets and turns on a timer for measuring a predetermined time (for example, 1 minute) (step S17). The controller 11 determines whether or not a predetermined time has passed by the timer (step S18), and when the predetermined time has passed, the controller 11 increments the counting variable C whose initial value is 0 (adds 1) (step S19). .

  Next, the controller 11 rotates the motor M that drives the heating pump 44 at the predetermined rotational speed (step S20). Then, the motor current value at this time is compared with the reference value (step S21). When the motor current value is larger than the reference value, the operation prohibition of the heating burner 41 is canceled (step S22), and the process is terminated. To do. When the motor current value becomes larger than the reference value in this way, the circulation path is thawed and the blockage is eliminated, so that it is determined that the operation is possible in step S5 of the heating process shown in FIG.

  In step S21, if the motor current value is equal to or less than the reference value, the process returns to step S17 until the number of determinations in step S21 is three using step C23, and the number of determinations is three. However, if the motor current value does not become larger than the reference value, the process proceeds to step S24. In this case, there is an abnormality in which the circulation path is not sufficiently thawed and the blockage is not solved. In step S14, the process proceeds to step S24 also when the detected temperature of the outside air temperature thermistor 62 is higher than a predetermined temperature. In this case, the blockage is caused by causes other than freezing. In step S24 described above, it is assumed that an abnormal display is displayed on the screen (display means) (not shown) of the remote controller 15, for example, “A failure has occurred. Please contact the service center” or the user refers to the manual. An error display “E02” or the like is displayed. At this time, in step S5 of the heating process shown in FIG. 2, it is determined that the operation is impossible.

  In step S12, if the motor current value is larger than the reference value, the blockage degree is at a level that does not hinder the operation of the hot air heater 7 and the floor heating panel 10 (the blockage of the circulation path has not occurred). The coping process ends. At this time, in step S5 of the heating process shown in FIG.

  As described above, the hot water circulation type heat source device 1 of the present embodiment is configured so that the heating burner is subjected to the blockage countermeasure process of the controller 11 when the heating hot water circulation path (heating circulation circuit 43) is blocked before operation. 41 is prohibited. Therefore, in this case, the heating heat exchanger 42 is not heated, so that it is possible to prevent emptying or the like. Further, when the heating circulation circuit 43 is frozen, the operation of the heating burner 41 is prohibited, and the fact is also displayed on the remote controller, so that the user can be notified of the freezing. Further, the hot water circulation type heat source apparatus 1 is provided with a thawing heater 63 in the heating circulation circuit 43 (bypass pipe 61), and when the heating circulation circuit 43 is frozen, the heating burner 41 is operated. The normal operation can be executed by releasing the prohibition.

  As described above, specific embodiments of the present invention have been described. However, the present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the present invention. For example, in the above-described embodiment, the outside air temperature thermistor 62 is provided to determine whether or not the heating circulation circuit 43 is frozen. However, the freezing of the heating circulation circuit 43 is detected based on the temperature indicated by the heating temperature sensor 45, for example. In this case, the number of parts can be reduced.

  Further, in addition to the configuration of the above embodiment, the heating pump 44 may be provided with a thawing heater 63 as indicated by a virtual line in FIG. In this case, the controller 11 determines whether or not the number of rotations of the motor M that drives the heating pump 44 is equal to or less than a predetermined value, following step 11 in the flowchart of FIG. Then, it is determined that the heating pump 44 is frozen when the number of rotations of the motor M is equal to or less than the predetermined value, the thawing heater 63 provided in the heating pump 44 is energized, and after confirming the thawing of the heating pump 44, Proceed to step 12 shown in FIG. Therefore, according to the above configuration, it is possible to cope with the case where the drainage of the heating pump 44 is insufficient and the heating pump 44 is frozen, and the usability is improved.

  Moreover, although the said embodiment demonstrated the case where the hot water circulation type heat source machine 1 was newly installed (when a user uses it for the first time after a test run), it does not restrict to this, and the said blockade countermeasure process is performed every time heating operation is performed. Of course, you may be allowed to do.

  Moreover, although the said embodiment demonstrated the countermeasure against obstruction | occlusion of the circulation path of warm water regarding the heating means 13 (or heating circulation circuit 43) of the warm water circulation type heat source device 1, warm water is referred regarding the reheating means 14 (or bath circulation circuit 72). It may be possible to cope with blockage of the circulation path, or to be executed for both the heating means 13 and the reheating means 14. In this case, in order to cope with the blockage of the hot water circulation path with respect to the bath circulation circuit 72, when the blockage degree of the bath circulation circuit 72 is detected based on the current value of the motor driving the bath pump 73, the bath circulation circuit 72 is blocked. Control which prohibits operation | movement of the heating burner 41 is performed. With this configuration, the present invention can also be applied to a hot water circulation heat source machine that does not have a heating function.

  Moreover, in the said embodiment, although what burns gas and produces | generates warm water was shown, you may produce | generate warm water using the burner which burns other fuels, such as petroleum. Furthermore, the thing which is not provided with the hot water supply function, or the warm water circulation type heat source machine only for heating may be used.

The block diagram of the warm water circulation type heat source machine of one Embodiment of this invention. The flowchart which shows the heating process by the apparatus of FIG. The flowchart which shows the obstruction | occlusion countermeasure process by the apparatus of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Hot water circulation type heat source machine, 11 ... Controller, 13 ... Heating means, 41 ... Heating burner, 42 ... Heating heat exchanger, 43 ... Heating circulation circuit, 44 ... -Heating pump, 61 ... bypass pipe, 62 ... outside temperature thermistor, 63 ... thawing heater.

Claims (3)

A hot water circulation type heat source machine having a burner, a hot water circulation path provided with a heat exchanger heated by the burner, and a circulation pump for circulating hot water in the circulation path,
Before operating the burner, the motor that drives the circulation pump is rotated at a predetermined number of revolutions. At this time, the current value that flows through the motor and a reference that serves as a criterion for determining whether or not the circulation path is closed. A control means for comparing the value and prohibiting the operation of the burner when the current value is smaller than the reference value ;
Temperature detecting means for detecting the temperature of the circulation path or the outside air temperature, and
When the current value is smaller than the reference value, the control means determines whether or not the cause of the blockage is freezing based on the temperature detected by the temperature detection means, and displays the determination result on the display means. A hot water circulation type heat source machine. A heater is provided in the circulation path,
The hot water circulation heat source apparatus according to claim 1 , wherein the control means energizes the heater when determining that the cause of the blockage of the circulation path is freezing. The control means rotates the motor at a predetermined rotational speed after a predetermined time from energizing the heater, compares the current value flowing through the motor at this time with the reference value, and the current value is the reference value. The hot water circulation heat source apparatus according to claim 2 , wherein the prohibition of the operation of the burner is canceled at the time described above.

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