JP6089734B2 - Combustion device - Google Patents

Description

  The present invention relates to a combustion apparatus, and more particularly, to a combustion apparatus provided with a water seal tank in a discharge path of a drain generated by a heat exchanger.

  Recently, in a combustion apparatus such as a gas hot water supply apparatus, a latent heat recovery type combustion apparatus that heats a secondary heat exchanger using exhaust gas of combustion gas that heats a primary heat exchanger has been provided.

  In this type of combustion apparatus, since acidic drain (condensed water) is generated in the secondary heat exchanger during the combustion operation, a drain discharge path for discharging the generated drain to the outside is provided. Since the drain discharge path communicates with the combustion gas passage due to its structure, the combustion gas may leak to the outside through the drain discharge path. In particular, in a combustion apparatus installed indoors, it is necessary to reliably prevent such leakage of combustion gas from the drain discharge path. Therefore, a water storage space (water seal) that prevents leakage of combustion gas to the drain discharge path. A tank is provided (for example, see Patent Document 1).

  The water-sealed tank provided in such a combustion apparatus is configured to store liquid such as water and drain in the tank so that the drain discharge path is in a water-sealed state and prevents passage of combustion gas. Therefore, if the water level in the tank decreases due to water leakage or evaporation, the water seal state may be broken. For this reason, the water seal tank of this type of combustion device is provided with a water level electrode for detecting the water level in the tank, and the control unit of the combustion device uses this water level electrode to maintain the water seal state in the tank. It is designed to detect whether or not it is leaning.

  By the way, as is well known, the water level electrode for detecting the water level is for detecting the presence or absence of water by flowing a weak current between the two electrodes via water. Because of its nature, as long as there is no water seal rupture, it is always immersed in water containing drain, so that the drain is ionized and adheres even if it is slightly energized. Further, since many impurities are contained in the water-sealed tank, these impurities also adhere. Therefore, it is known that when the water level electrode of the water seal tank is used for a long period of time, a film is formed around it, and this film becomes a resistance and prevents detection of the water level (detection of the water seal state). Yes.

  As a measure for preventing the occurrence of such a problem, for example, when it is not necessary to detect the water seal state of the water seal tank such as when the combustion is stopped, the energization cycle (energization OFF period) for the water level electrode is set to the combustion operation. It may be possible to extend the time or to stop the energization of the water level electrode during a period when detection of the water seal state is unnecessary (that is, to prevent detection of the water seal state during this period). It is done.

JP 2009-109133 A

  However, in such a measure, deterioration of the water level electrode during combustion stop can be suppressed, but deterioration of the water level electrode during combustion operation cannot be suppressed. Therefore, in a combustion apparatus used in an environment where the combustion operation takes a long time. Has a problem that the effect of suppressing deterioration of the water level electrode is small.

  That is, for example, some combustion apparatuses have a heating function for supplying hot water to the hot water heating apparatus. When a combustion apparatus having such a heating function is used in a cold region, the combustion operation for heating is performed. Since the time is long, the water level electrode may deteriorate in a short period.

  In addition, regarding a hot water supply function for supplying hot water to a hot water tap such as a currant, for example, when the combustion device is used for business use, the combustion operation time becomes long and the water level electrode deteriorates in a short period of time. There is a fear.

  The present invention has been made in view of such conventional problems, and the object of the present invention is to reduce deterioration of a water level electrode that detects a water-sealed state even in an environment where a combustion operation takes a long time. It is to provide a combustion apparatus.

In order to achieve the above object, a combustion apparatus according to claim 1 of the present invention includes a drain discharge path for discharging drain generated in accordance with a combustion operation, and a water seal for sealing the drain discharge path. A tank, a water level electrode for detecting the water level in the water seal tank, and energizing the water level electrode at a predetermined energization period for a predetermined time to monitor whether the water seal tank is in a water seal state or not. In the combustion apparatus including the control unit, when the water seal state of the water seal tank is detected, the control unit sets the energization cycle for the water level electrode to a cycle longer than the predetermined energization cycle. In addition, according to the CO emission amount calculated based on the combustion operation, a control configuration is provided in which the cycle is changed to a longer period if the CO emission amount is small and shorter if the CO emission amount is large .

  That is, in the combustion apparatus according to claim 1, when the control unit detects the water seal state of the water seal tank, the control unit extends the energization cycle for the water level electrode according to the CO emission amount calculated based on the combustion operation. Since the cycle is changed (the energization cycle is extended), the integrated energization time to the water level electrode during the combustion operation is shortened. Therefore, even when used in an environment where the combustion operation takes a long time, deterioration of the water level electrode due to energization can be suppressed to a minimum.

  In addition, since the extension width of the energization cycle (that is, the extension time) is determined according to the CO emission amount predicted by the calculation, even if the water seal in the water seal tank is broken, an amount of CO that poses a danger to the human body. It can be set so that the water level electrode is energized before the water is discharged (the water seal state is checked), and the energization cycle can be changed longer without sacrificing safety.

  A combustion apparatus according to a second aspect of the present invention is the combustion apparatus according to the first aspect, wherein the CO emission amount is calculated based on a fuel control value and a combustion time of the combustion operation. .

  That is, in the combustion apparatus according to claim 2, the CO emission amount that determines the extension width of the energization cycle for the water level electrode is a numerical value that can be grasped by the control unit when controlling the combustion apparatus (the fuel control value of the combustion operation and the combustion time). Therefore, the present invention can be applied only by changing the software of the control unit.

  A combustion apparatus according to claim 3 of the present invention is the combustion apparatus according to claim 1, wherein the CO emission amount is calculated based on a detection value of a CO concentration sensor and a combustion time. .

  That is, in the combustion apparatus according to the third aspect, the CO emission amount that is actually emitted along with the combustion operation is used in calculating the CO emission amount that determines the extension width of the energization cycle for the water level electrode. Can be calculated accurately.

According to the combustion apparatus of the present invention, when the water sealing state of the water sealing tank is detected , the energization cycle for the water level electrode is longer than the predetermined energization cycle and is calculated based on the combustion operation. Depending on the CO emission amount, the cycle is changed to a shorter period if the CO emission amount is small and to a shorter period if the CO emission amount is large. Even under such an environment, deterioration of the water level electrode due to energization can be suppressed to a small extent.

It is a schematic block diagram which shows an example of the combustion apparatus with which this invention is applied. It is a flowchart which shows an example of the control procedure of water level electrode deterioration prevention control in the combustion apparatus. It is explanatory drawing which shows an example of the data table used for the water level electrode deterioration prevention control in the combustion apparatus.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
Embodiment 1
FIG. 1 shows an example of a combustion apparatus to which the present invention is applied. The combustion apparatus shown in FIG. 1 has a hot water supply function for supplying hot water to a hot water tap (not shown) such as a curan, and a heating system that supplies hot water to a hot water heating apparatus (not shown) such as a floor heating panel and a fan convector. A gas water heater 1 having a function includes a latent heat recovery type heat exchanger in a heat exchanger that generates hot water for hot water supply and for heating.

  Specifically, the gas hot water supply device 1 includes a hot water supply hot water generator 2 that generates hot water for hot water supply, a hot water generator 3 for heating that generates hot water for heating, and each of these hot water supply and heating heaters. The control part 4 which controls the warm water production | generation parts 2 and 3 is provided as a main part.

  The hot water supply hot water generator 2 is disposed above the hot water supply burner 21, the hot water supply fan 22 that supplies combustion air to the hot water supply burner 21, and the hot water supply burner 21, and the combustion gas of the hot water supply burner 21. The primary heat exchanger for hot water supply 23 heated by the hot water and the secondary heat exchange for hot water supply heated by the exhaust gas of the combustion gas which is disposed above the primary heat exchanger for hot water supply 23 and heated the primary heat exchanger for hot water supply 23 (Latent heat recovery type heat exchanger) 24.

  And the inlet side of the secondary heat exchanger 24 for hot water supply is connected to the inlet pipe 6 that supplies water from a water source such as a water supply, the outlet side thereof is connected to the inlet side of the primary heat exchanger 23 for hot water supply, The outlet side of the hot water primary heat exchanger 23 is connected to the outlet pipe 7 connected to the hot water tap. That is, in this gas hot water supply device 1, the water supplied from the water inlet pipe 6 flows in the order of the secondary heat exchanger 24 and the primary heat exchanger 23, and during these flows, the secondary heat exchanger 24 and the primary heat exchanger are flowed. The temperature is raised at 23 and supplied to the hot-water tap through the hot water outlet pipe 7. In FIG. 1, reference numeral 8 denotes a bypass pipe that connects the water inlet pipe 6 and the hot water outlet pipe 7, and the bypass pipe 8 is provided with a flow rate adjusting valve 9 that is controlled by the control unit 4.

  The hot water supply burner 21 is composed of a gas burner that burns by receiving supply of fuel gas from a gas supply source (not shown). This hot water supply burner 21 is composed of a plurality of (for example, 14) combustion pipes (not shown), and the gas pressure of the fuel gas supplied through a fuel supply path (not shown) and the number of combustion tubes burned. The combustion capacity can be adjusted by switching (the number of combustion stages) (for example, switching the number of combustion stages to 3, 5, 8, 14 in stages). The gas pressure of the fuel gas is controlled by a proportional valve provided in the fuel supply path to the hot water supply burner 21, and the number of combustion tubes is controlled by an electromagnetic valve provided in the fuel supply path to the combustion pipe. The unit 4 is controlled.

  The heating hot water generating unit 3 includes a heating burner 31, a heating fan 32 that supplies combustion air to the heating burner 31, and a combustion gas of the heating burner 31 that is disposed above the heating burner 31. Heating primary heat exchanger 33 heated by the heater, and heating secondary heat exchange disposed above the heating primary heat exchanger 33 and heated by the exhaust gas of the combustion gas that heated the heating primary heat exchanger 33 (Latent heat recovery type heat exchanger) 34.

  The heating hot water generator 3 is connected with a heating return pipe (pipe for returning the hot water radiated by the hot water heating apparatus 1) 10 to the water inlet side of the heating secondary heat exchanger 34. The outlet side is connected to the incoming side of the heating primary heat exchanger 33 via the expansion tank 11 and the circulation pump 12, and the outlet side of the heating primary heat exchanger 33 is connected to a hot outlet pipe (for example, a fan convector). It is connected to a hot water heating device (hereinafter referred to as a “high temperature terminal”) 13 that requires hot water of a high temperature 13. The pipe connecting the circulation pump 12 and the primary heat exchanger 33 for heating is branched in the middle of the pipe and is connected to a low-temperature forward pipe (for example, a hot-water heating apparatus that requires low-temperature hot water such as a floor heating panel (hereinafter referred to as a hot water heater). , Referred to as “low temperature terminal”).

  In other words, the heating hot water generator 3 burns the heating burner 31 and drives the circulation pump 12, so that the high temperature heated by the heating secondary heat exchanger 34 and the heating primary heat exchanger 33 is increased. Hot water is supplied to the high temperature terminal, and low temperature hot water heated by the secondary heat exchanger 34 for heating is supplied to the low temperature terminal.

  The heating burner 31 is composed of a gas burner having a plurality of (for example, seven) combustion pipes (not shown), similar to the hot water supply burner 21 described above. The combustion capacity can be adjusted according to the number of combustion (the number of combustion stages) (for example, by switching the number of combustion to 2, 3, 5, or 7 in stages). The controller 4 controls the gas pressure of the fuel gas and the number of combustion tubes in the combustion pipe by a proportional valve provided in the fuel supply path to the heating burner 31 and an electromagnetic valve provided in the fuel supply path to the combustion pipe. It comes to control.

  And each hot water production | generation part 2 and 3 (specifically burner 21,31, primary heat exchanger 23,33 and secondary heat exchanger 24,34) for hot water supply and heating comprised in this way is comprised. In the upper part, it is accommodated in a metal can 5 in which an exhaust cylinder 5a for discharging exhaust gas to the outside (outdoors) is formed. A CO concentration sensor 51 that detects the CO (carbon monoxide) concentration discharged from the exhaust cylinder 5a is provided inside the exhaust cylinder 5a.

  15 is a drain recovery unit for recovering acidic drain (condensate) generated in the hot water supply and heating secondary heat exchangers 24 and 34 in accordance with the combustion operation of the hot water supply and heating burners 21 and 31. Part 15 is shown. As shown in the figure, the drain recovery unit 15 is disposed below the secondary heat exchangers 24 and 34, and receives and recovers the drain falling from the secondary heat exchangers 24 and 34. The drain recovered by the drain recovery unit 15 is introduced into the neutralizer 17 through the drain discharge pipe (drain discharge path) 16. In the illustrated example, the configuration in which the drain generated in the secondary heat exchangers 24 and 34 is recovered by the single drain recovery unit 15 is shown, but independent drain recovery is performed for each of the secondary heat exchangers 24 and 34. It is also possible to provide a portion 15 and introduce the drain recovered by each drain recovery portion 15 into the neutralizer 17 using the drain discharge path 16.

  The neutralizer 17 is an apparatus for neutralizing acidic drain and water sealing the drain discharge pipe 16. The neutralizer 17 is filled with a neutralizing agent such as calcium carbonate ( A portion (shown by hatching in FIG. 1) 17a and a water-sealed tank 17b provided in communication with the neutralization tank portion 17a are provided and introduced into the neutralization tank portion 17a through the drain discharge passage 16. The drain is neutralized in the neutralization tank portion 17a and stored in the water-sealed tank 17b.

  The water seal tank 17b is composed of a tank having a space for storing water containing drained water after neutralization. When the water above a certain level is stored in the tank, the drain discharge pipe 16 is sealed with water. It has come to be. The water-sealed tank 17b is provided with a water level electrode 18 for detecting the water level (water-sealed state) in the tank. Whether it is in a sealed state or not is monitored.

  In the gas water heater 1 shown in FIG. 1, as the water level electrode 18, a high water level detection electrode 18a for detecting a high water level in the tank, a low water level detection electrode 18b for detecting a low water level in the tank, and a ground electrode 18c. The water seal state of the water seal tank 17b is detected depending on whether or not a weak current flows between the low water level detection electrode 18b and the ground electrode 18c. That is, if no current flows between the low water level detection electrode 18b and the ground electrode 18c when the low water level detection electrode 18b is energized, the water level in the tank is low and the water sealed tank 17b is not water sealed (that is, water It is determined that it is in a sealed state (details will be described later).

  In FIG. 1, reference numeral 19 denotes an overflow discharge pipe for discharging water in the tank to the outside when the water seal tank 17b overflows. The overflow discharge pipe 19 together with the drain discharge pipe 16 is a drain discharge path. Is forming.

  The control unit 4 is a control device that controls each part of the gas hot water supply device 1, and performs various controls related to the hot water supply function and the heating function based on a control signal given from an operation device (not shown) and the like in the present embodiment. In the gas water heater 1 shown, in order to prevent deterioration of the water level electrode 18 caused by energization of the water level electrode 18, the control unit 4 is programmed to perform water level electrode deterioration prevention control described below.

FIG. 2 is a flowchart showing a control procedure of water level electrode deterioration prevention control.
As shown in FIG. 2, the control unit 4 determines whether or not the combustion operation of the hot water supply burner 21 or the heating burner 31 is started in the water level electrode deterioration prevention control (see step S1 in FIG. 2).

When the combustion operation of one of the hot water supply burner 21 and the heating burner 31 is started, the control unit 4 determines whether or not a certain time T (for example, several seconds to several minutes) has elapsed since the start of combustion. (See step S2 in FIG. 2) and if the predetermined time T has not elapsed, a predetermined energization cycle A (for example, a cycle of 2 seconds) is applied to the water level electrode 18 (specifically, the low water level detection electrode 18b). ) Is energized for a predetermined time T _ON (for example, about 0.2 seconds), and whether or not the water level is detected by the water level electrode 18 during this energization period (that is, whether the water seal tank 17b is in a water seal state). (See step S6 in FIG. 2).

  And if the said fixed time T passes and the water level electrode 18 detects a water level (water-sealed state) in this state (Namely, the state which is supplying with electricity supply period A) (FIG. 2, step S3 Yes). The control unit 4 changes the energization cycle for the water level electrode 18 from the energization cycle A to the energization cycle B, and starts the determination of the water seal state by the water level electrode 18 by the energization cycle B (see step S4 in FIG. 2).

  And the energization to the water level electrode 18 by this energization period B will stop combustion of both the burners 21 and 31 (refer FIG. 2 step S5), or the water level electrode 18 will not detect a water level (water-sealed state). (See step S3 in FIG. 2).

Here, the energization cycle A and the energization cycle B will be described.
As described above, the energization cycle A is a cycle used to check the water seal state of the water seal tank 17b immediately after the hot water supply burner 21 or the heating burner 31 starts the combustion operation. Is set to a short period (for example, a period of 2 seconds). That is, by setting the energization period A short, the control unit 4 can determine whether or not the water sealing by the water sealing tank 17b is performed at an early stage after the start of the combustion operation.

  On the other hand, the energization cycle B is a cycle set to prevent deterioration of the water level electrode 18 due to energization of the water level electrode 18. Therefore, the energization cycle B is set to a cycle longer than at least the energization cycle A. That is, by setting (extending) the energization cycle B longer than the energization cycle A, the accumulated energization time for the water level electrode 18 is suppressed, and deterioration of the water level electrode 18 due to energization is reduced. That is, even if the energization cycle is changed from A to B, it is not necessary to change the energization time (0.2 seconds above) in one energization cycle. The accumulated energization time for the water level electrode 18 is shortened, and as a result, the adhesion of impurities and the like to the water level electrode 18 due to the energization is suppressed, and the deterioration of the electrode is prevented.

  In the present embodiment, this energization cycle B is set according to the calculated CO emission amount, that is, the control unit 4 calculates the CO emission amount based on the combustion operation of the burners 21 and 31. The control unit 4 is configured to vary the length of the energization cycle B in accordance with the CO emission amount.

  Specifically, the energization cycle B assumes that the water seal of the water seal tank 17b is broken during a period in which the water level electrode 18 is not energized in the energization cycle B (energization OFF period). Even if CO leaks from the water-sealed tank 17b over the entire period, the CO concentration in the vicinity of the gas water heater 1 (in the case where the gas water heater 1 is installed indoors, the room where the gas water heater 1 is installed) Is set so as not to reach a predetermined danger value. That is, this energization cycle B is set long if the CO emission amount calculated based on the combustion operation of the burners 21 and 31 is small if the surrounding environment of the gas water heater 1 is the same, and short if the CO emission amount is large. Is done.

  Here, as a specific method of setting the energization cycle B by the control unit 4, a method of storing a predetermined calculation formula in the control unit 4 and setting the energization cycle B based on the calculation formula, A method of storing a data table for setting the energization cycle B in 4 and setting the energization cycle B based on this table may be employed.

First, a setting method using a calculation formula will be described.
In this method, the control unit 4 calculates the CO emission amount K based on the fuel control value of the burners 21 and 31 and the combustion time using the following formula (1).
K = (1-exp (−0.5 × t)) × (M × p) /8.4 (1)
In this equation (1), K is the indoor CO value (CO emission amount) [ppm] after time t, M is the fuel supply amount (fuel control value) [m3 / h], and p is the combustion gas at time t. Average CO value [ppm] is shown. The volume of the room in which the gas water heater 1 is installed is 16.8 m 3.
Then, the longest time of the energization cycle B is determined so that the CO emission amount K calculated by the mathematical formula (1) becomes K <dangerous value (for example, 300 ppm), and the energization cycle B is within the longest time range. A specific time is set. In this setting, at least the energization cycle B is set to a cycle longer than the energization cycle A.

  On the other hand, the method of determining the energization cycle B using a table is a data table as shown in FIG. 3, that is, a table showing the relationship between the integrated amount of the fuel control value and the energization cycle B. The energization period B is set based on the integrated value of the fuel control values of the burners 21 and 31 during the combustion operation. Even when this table is used, the energization cycle B is set to be longer than the energization cycle A.

  Thus, in the gas hot water supply device 1 shown in the present embodiment, when either one of the hot water supply burner 21 or the heating burner 31 starts the combustion operation, the controller 4 elapses a certain time T from the start of the combustion operation. Until the water-sealed state of the water-sealed tank 17b is confirmed at an early stage using a short energization cycle A, and when the water-sealed state of the water-sealed tank 17b is detected by the water level electrode 18 after a predetermined time T has elapsed. The water level electrode 18 is energized in the energization cycle B. Therefore, in this gas hot water supply device 1, the cumulative energization time to the water level electrode 18 during the burning operation of the burners 21 and 31 is shortened, and the deterioration of the water level electrode 18 due to energization is small even in an environment where the combustion operation takes a long time. A combustion device is provided.

  It should be noted that energization to the water level electrode 18 can be appropriately set when both the burners 21 and 31 are stopped from combustion, but combustion gas is not generated when both the burners 21 and 31 are stopped from combustion. In addition, since there is no risk of combustion gas leakage, it is possible to employ control such as stopping energization of the water level electrode 18 (that is, not detecting the water seal state during this period).

Embodiment 2
Next, a second embodiment of the present invention will be described.
In the second embodiment, the content of the water level electrode deterioration prevention control of the gas hot water supply device 1 shown in the first embodiment is modified. Specifically, in calculating the CO emission amount, the control unit 4 The CO emission amount is calculated based on the detection value of the CO concentration sensor 51 and the combustion time of the burners 21 and 31. Since other basic configurations are the same as those in the first embodiment, portions having the same configurations are denoted by the same reference numerals and description thereof is omitted.

  Here, the control procedure of the water level electrode deterioration prevention control in the gas hot water supply apparatus 1 shown in the second embodiment is the same as that of the gas hot water supply apparatus 1 shown in the first embodiment. That is, water level electrode deterioration prevention control is performed according to the procedure shown in FIG.

  In the gas hot water supply device 1 shown in the second embodiment, the detection value of the CO concentration sensor 51 and the combustion of the burners 21 and 31 are set when setting the energization cycle B to the water level electrode 18 in the water level electrode deterioration prevention control. The CO emission amount is calculated based on the time.

  Specifically, when the energization cycle B is set based on the calculation formula, the same formula as the formula (1) is used, and the CO emission amount K is set based on the detected value of the CO concentration sensor 51 and the combustion time. calculate. That is, the CO emission amount K is calculated using the detection average value of the CO concentration sensor 51 at time t as p in the above formula (1), and the longest energization cycle B is set so that K <dangerous value (for example, 300 ppm). The time is determined, and a specific time of the energization cycle B is set within the longest time range. In this setting, at least the energization cycle B is set to a cycle longer than the energization cycle A, as in the first embodiment.

  Further, when the energization cycle B is determined using the data table, the CO emission amount within a certain time (fuel supply amount × detected value of the CO concentration sensor 51) instead of the integrated amount of the fuel control value in FIG. A data table is configured using the integrated values of the current values, and the energization period B is set based on the integrated value of the CO emission amount. In this case as well, the energization cycle B is set to be longer than the energization cycle A, as in the first embodiment.

  Thus, also in the gas hot water supply device 1 shown in the present embodiment, when either one of the hot water supply burner 21 or the heating burner 31 starts the combustion operation, the control unit 4 has passed a certain time T from the start of the combustion operation. Until the water sealing state of the water sealing tank 17b is confirmed at an early stage using a short energization cycle A, while the water sealing state of the water sealing tank 17b is detected by the water level electrode 18 after a predetermined time T has elapsed. Since the energization to the water level electrode 18 is performed with a long energization period B, the accumulated energization time to the water level electrode 18 during the combustion operation of the burners 21 and 31 is shortened, and the combustion operation takes a long time. However, a combustion apparatus in which the water level electrode 18 is less deteriorated due to energization is provided.

  The above-described embodiments show preferred embodiments of the present invention, and the present invention is not limited to these, and various design changes can be made within the scope of the invention.

  For example, in the above-described embodiment, the case where the gas hot water supply device 1 having the hot water supply function and the heating function is used as the combustion device is shown. However, the present invention is a drain discharge path for discharging the drain generated in accordance with the combustion operation. If it is a combustion device provided with a water level electrode 18 for detecting the water level in the tank in the water-sealed tank provided in the tank, it can be applied to a hot water supply device having only a hot water supply function or a hot water supply device having a bathing function. It is.

  Further, in the above-described embodiment, the case where the CO concentration sensor 51 is provided inside the exhaust pipe 5a is shown. However, the CO concentration sensor 51 is located at a position where the CO emission amount generated by the combustion of the burners 21 and 31 can be detected. If it exists, it may be provided at an appropriate place other than the exhaust pipe 5a.

1 Gas water heater (combustion device)
2 Hot water generation unit for hot water supply 3 Hot water generation unit for heating 4 Control unit 5 Can body 6 Inlet pipe 7 Outlet pipe 10 Heating return pipe 11 Expansion tank 12 Circulation pump 13 High temperature forward pipe 14 Low temperature forward pipe 15 Drain recovery section 16 Drain discharge pipe (Drain discharge path)
17 Neutralizer 17b Water-sealed tank 18 Water level electrode 21 Hot water supply burner 22 Hot water supply combustion fan 23 Hot water supply primary heat exchanger 24 Hot water supply secondary heat exchanger 31 Heating burner 32 Heating blower fan 33 Heating primary heat exchange 34 Secondary heat exchanger for heating

Claims (3)

A drain discharge path for discharging drain generated in accordance with the combustion operation, a water seal tank for sealing the drain discharge path, a water level electrode for detecting the water level in the water seal tank, and In a combustion apparatus comprising: a controller that monitors whether or not the water-sealed tank is in a water-sealed state by energizing the water level electrode for a predetermined time with a predetermined current-carrying period;
When the water-sealed state of the water-sealed tank is detected, the control unit calculates an energization cycle for the water level electrode based on a combustion operation that is longer than the predetermined energization cycle. According to the CO emission amount , the combustion apparatus is provided with a control structure that changes to a longer period if the CO emission amount is small and changes to a shorter period if the CO emission amount is large .   The combustion apparatus according to claim 1, wherein the CO emission amount is calculated based on a fuel control value of combustion operation and a combustion time.   The combustion apparatus according to claim 1, wherein the CO emission amount is calculated based on a detection value of a CO concentration sensor and a combustion time.

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