JP4045983B2 - Linked water heater and its complementary operation control method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention connects the hot water outlets of a plurality of water heaters, changes the number of hot water heaters to be operated (combustion operation) according to the required capacity when using the hot water supply, with the plurality of water heaters being controlled. The present invention relates to a connected hot water supply apparatus in which unit control is performed and a complementary operation control method thereof.
[0002]
[Prior art]
Conventionally, what was proposed by patent document 1 etc. is known as this type of connection type hot-water supply apparatus. In this system, each hot water supply path of a plurality of hot water heaters is connected to a common hot water supply path via an open / close switching valve, and one hot water supply allocated as a main hot water heater according to the hot water outlet request at the hot water supply destination. Control is performed so that only the water heater is operated for combustion, or in addition to this, another one of the water heaters allocated as the sub-water heater is also operated for combustion.
[0003]
[Patent Document 1]
Japanese Patent Laid-Open No. 2001-153461
[Problems to be solved by the invention]
However, in the connected hot water supply apparatus, for example, while one hot water heater is being burned and hot water is being supplied, the second hot water heater is also burned and moved to hot water supply by two hot water heaters. When adding a hot water heater to be combusted, there is a possibility that a situation in which the hot water discharge characteristic at the hot water supply destination is deteriorated due to the ignition delay of the hot water heater to be additionally combusted may occur.
[0005]
In other words, the operation control when the hot water heater is combusted is started by confirming that heating is necessary by detecting the incoming water temperature and comparing it with the set hot water temperature, etc., and then starting the control when the combustion burner is ignited. The As a control at the time of ignition of the water heater, first, a blower fan for supplying combustion air is activated to perform a pre-purge to start up to a predetermined rotational speed, and then an ignition operation by an ignition coil or the like is performed. The fuel is ignited and combustion starts. The reason for checking the incoming water temperature is that the water supply to the incoming side of the hot water heater is already heated by hot water from a solar water heater, exhaust heat recovery from a gas engine or heat pump, etc. This is because the combustion operation is prohibited in the case where inconvenience occurs when combustion heating is performed in consideration of the fact that the heated hot water or the like may be supplied. The reason why the ignition operation is performed after the pre-purge is performed is to wait for the blower fan to be in an operating state at a predetermined rotational speed and to be in a state where the combustion air is stably supplied. It is. Therefore, in the above combustion operation, when the incoming water temperature is higher than the predetermined temperature state, the start of the control at the time of ignition is prohibited and the pre-purge process is not performed, and the start of the combustion operation is permitted because the incoming water temperature is low. Even if the pre-purge process is not performed, the ignition, i.e., ignition is not shifted.
[0006]
On the other hand, when the combustion hot water heater is stopped, the on / off switching valve is closed and communication with the hot water supply path is shut off. The hot hot water heated by the heating flows between the heat exchanger and the bypass passage for the mixed water, and the relatively hot hot water also flows in the inlet channel where the incoming temperature sensor is installed. Will come. As a result, the next time the combustion operation of the water heater is performed, the incoming water temperature sensor detects the relatively hot water temperature, not the original incoming water temperature. In some cases, the start of the combustion operation is prohibited. This situation is resolved by detecting the original incoming water temperature after the incoming water temperature has been introduced later, and the combustion operation of pre-purge and ignition after pre-purge is started. In other words, when a demand for combustion operation occurs, the start of pre-purge is delayed by detecting the apparent water temperature as described above, and the ignition delay (for example, several (Second delay).
[0007]
And, for example, when switching from the combustion state of one unit to the combustion state of two units due to such ignition delay, the temperature of the hot water discharged from the hot water supply destination fluctuates temporarily and There is a risk that inconvenience will be caused.
[0008]
The phenomenon that the relatively hot water flows in the water inlet channel where the water temperature sensor is installed is a liquid such as oil even when each water heater is constituted by a gas water heater. Even if it is configured by an oil water heater that burns fossil fuel, it can occur in any case, but in particular, the combustion flame of the combustion burner is formed downward and the heat exchanger Tends to be prominent in the so-called reverse combustion type oil water heater receiving from above.
[0009]
The present invention has been made in view of such circumstances, and the purpose of the present invention is to reliably avoid a situation in which a situation in which the hot water discharge characteristic is deteriorated when the number of combustion is increased, is connected type. The purpose is to further improve the hot water supply characteristics of the hot water supply device.
[0012]
[Means for Solving the Problems]
In order to achieve the above object, according to the first aspect of the present invention, there is provided a hot water supply device that is connected to a common hot water supply route following the hot water supply destination so that each hot water supply passage in the plurality of hot water supply devices can be switched open and closed, and is operated by combustion. The number of units is controlled so as to change the number according to the heat load of the hot water supply destination, and the combustion burner is ignited in a state where the combustion air is supplied from the blower fan as the combustion operation of each water heater. The following specific items are provided for a complementary operation control method for a connected hot water supply apparatus configured to be burned by the following method. In other words, when receiving a supplement request command for supplementary combustion by supplementing a hot water heater that is stopped in addition to a hot water heater that is in combustion, the water temperature sensor that is interposed in the water inlet of the hot water heater that is stopped in combustion is used. Even when the detected temperature does not satisfy the predetermined combustion permission condition for the incoming water temperature, the pre-purge process is started by forcibly starting the air blower fan of the hot water heater that has stopped combustion, and the combustion burner is ignited. It was decided to keep the air blowing operation possible.
[0013]
In the case of the invention according to claim 1 , for example, in order to satisfy the hot water supply request at the hot water supply destination while one hot water heater is being burned and hot water supply to the hot water supply destination is being performed, When a complementary request command for additional combustion of the water heater is received, even if the incoming water temperature detected by the incoming water temperature sensor does not satisfy the predetermined combustion permission condition, the blower fan of the second hot water heater is The pre-purge process is started by being forced. Then, the blower fan is in operation state becomes to supply the amount of air capable of igniting the combustion burner of the upper Symbol second unit of the water heater (e.g. operating state at a predetermined rotational speed). That is, even when the temperature detected by the incoming water temperature sensor does not satisfy the combustion permission condition, the pre-purge process for ignition preparation is performed in advance, so if the detected temperature satisfies the combustion permission condition, the ignition is performed. By executing the operation, it can be ignited immediately. As a result, it is possible to avoid the occurrence of an ignition delay when the pre-purge process is started after waiting for the detected temperature to satisfy the combustion permission condition, and the hot water temperature characteristics at the hot water supply destination due to the ignition delay. It is possible to avoid the occurrence of a situation where the situation becomes worse.
[0014]
In the complementary control method according to the first aspect, the pre-purge process is continued even after the blower fan rises to a predetermined blower operation state, while the incoming water temperature detected by the incoming water temperature sensor satisfies the combustion permission condition. If not, the pre-purge process may be stopped (claim 2 ). By doing so, if the state where the incoming water temperature does not satisfy the conditions for permitting combustion continues, it is possible to determine that the temperature of the incoming water itself is really high and combustion is unnecessary, and stop the pre-purge process. It becomes.
[0015]
Further, in the complementary operation control method according to claim 1, after the pre-purge process, the blower fan is brought into a blower operation state in which the combustion burner can be ignited, and then the hot water outlet of the hot water heater in the combustion stop is communicated with the hot water supply route. It is only necessary to perform open switching control so as to do this (claim 3 ). As a result of the open switching control, hot water in the water heater flows, and water enters the hot water heater and is ignited. Hot water at a predetermined temperature is supplied to the hot water supply destination.
[0016]
In order to realize the complementary operation control method, in the invention according to claim 4 , the hot water supply in which the hot water supply paths in the plurality of hot water heaters are connected to the common hot water supply path following the hot water supply destination so as to be openable and closable. The number of heaters is configured to be controlled so that the number of heaters is changed according to the heat load of the hot water supply destination, and each of the hot water heaters is ignited and burned in a state where the supply of combustion air from a blower fan is received. The following specific matters are provided for a connected hot water supply apparatus that includes a combustion burner and a heat exchanger that heats the incoming water from the water inlet passage by the combustion heat of the combustion burner and discharges the hot water to the hot water outlet passage. It was decided. That is, when receiving a supplement request command for supplementing combustion by supplementing a hot water heater whose combustion is stopped different from that of the hot water heater that is in combustion operation, a complementary operation control means for controlling the complementary operation by the hot water heater when combustion is stopped When the detected temperature detected by the incoming water temperature sensor interposed in the incoming water passage of the hot water heater during the combustion stop does not satisfy a predetermined combustion permission condition for the incoming water temperature as the complementary operation control means Even if it exists, it was set as the structure which starts the pre-purge process by forcibly starting the ventilation fan of the water heater in the combustion stop.
[0017]
In the case of the invention according to claim 4 , it is possible to surely obtain the operation by reliably carrying out the complementary control method according to claim 1 .
[0019]
【The invention's effect】
As described above, according to the complementary operation control method of any of the coupling type hot water supply apparatus of claims 1 to 3, when receiving a complementary request command for causing the additional combustion water heater is incoming water temperature sensor Even when the detected temperature detected by the above does not satisfy the predetermined combustion permission condition, the pre-purge process is executed in advance by forcibly operating the blower fan of the hot water heater to be additionally burned. If the combustion permission condition is satisfied, the ignition can be performed immediately by executing the ignition operation. Avoid This ensures that it is possible to top Symbol detected temperature is to avoid the occurrence of ignition delay of the case to start the pre-purge process from waiting for the combustion permission satisfy the condition, the deterioration of the hot water temperature characteristics due to the ignition delay Thus, the hot water characteristics can be improved.
[0020]
In particular, according to claim 2 , the operation of the blower fan can be avoided and stopped when the temperature of the incoming water is really high and combustion is not necessary. Moreover, according to Claim 3 , the hot water supply supplement to the hot water supply destination by additional combustion can be performed reliably.
[0021]
On the other hand, according to the connection type hot water supply apparatus of the fourth aspect, the complementary control method according to the first aspect can be reliably implemented, and the effect can be obtained with certainty.
[0022]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0023]
FIG. 1 shows a connected hot water supply apparatus according to an embodiment of the present invention. This connection type hot water supply device is a combination of a plurality of (three in the illustrated example) water heaters 2a, 2b, 2c, and the first to third water heaters 2a, 2b, 2c have the same configuration. Have. One of them is assigned as a main water heater, and the other is assigned as a sub-water heater. The individual controller 29a, 29b, 29c receives a control command from the system controller 3, and the main water heater performs a combustion operation for hot water supply. In order to compensate for this, the sub-water heater is operated for additional combustion.
[0024]
The connected hot water supply apparatus has an upstream end connected to a tap water supply source such as a water pipe and a downstream side branched to supply water to the water inlet 220 of each of the water heaters 2a, 2b, 2c, and an upstream end. Is connected to the hot water outlet 230 of each of the water heaters 2a, 2b, 2c via external solenoid valves 5a, 5b, 5c as open / close switching valves, and has one or more downstream ends (only one is shown in the figure). A hot water supply path 7 connected to the hot water tap 6 is provided. The external solenoid valves 5a, 5b, and 5c are controlled to be opened and closed by the system controller 3, and when opened, the incoming water from the water supply path 4 to the corresponding hot water heater and the hot water from the hot water heater to the hot water supply path 7 are generated. It becomes possible.
[0025]
Each of the water heaters 2a, 2b, 2c is constituted by an oil water heater that burns fuel oil (for example, kerosene) to heat the incoming water from each of the water inlets 220 and discharges the heated hot water to each of the outlets 230. Has been. In addition, you may make it comprise each said water heater 2a, 2b, 2c using oil hot water heaters other than the reverse combustion type mentioned later. Details of the oil water heater applied in the present embodiment as these water heaters 2a, 2b, and 2c will be described below based on the example shown in FIG.
[0026]
Each of the water heaters 2a, 2b, 2c includes a heat exchanger 21 disposed in the combustion can body 20, and a water inlet path 22 for allowing water from the water supply path 4 to enter the heat exchanger 21 through a water inlet 220. A hot water outlet 23 for discharging hot water heated by the heat exchanger 21 to the hot water outlet 230, and a bypass passage 24 for adjusting the temperature by mixing water with the hot water discharged from the heat exchanger 21; A combustion burner 25 that heats the heat exchanger 21 with combustion heat, and a fuel supply pipe 27 that supplies fuel oil from a fuel tank 26 to the combustion burner 25 are provided.
[0027]
The water inlet 22 is provided with a water inlet flow rate sensor 221 and a water inlet temperature sensor 222 for detecting the water inlet temperature from the water inlet 220, while the hot water outlet 23 is located upstream of the joining position with the downstream end of the bypass 24. A can body temperature sensor 231 for detecting a tapping temperature after being heated by the combustion can body 20 and a can body water amount adjustment valve 232 are provided at a side position, and the tapping point 230 is connected to the tapping outlet 230 at a position downstream of the merging position. A hot water supply temperature sensor 233 for detecting the hot water temperature is provided. The bypass passage 24 is provided with a bypass valve 241 for mixing the water from the water inlet 22 with a predetermined mixing ratio with respect to the hot water from the outlet 23.
[0028]
The combustion burner 25 is arranged in a reverse combustion type that injects the flame downward, and is constituted by, for example, a gun type burner having a return spray nozzle. The combustion burner 25 sprays and burns kerosene supplied by a fuel supply pipe 27 in which an electromagnetic on-off valve 251 and an electromagnetic supply pump 252 are interposed, and a part of the supplied oil is returned to the electromagnetic wave through a return pipe 253. It returns to the fuel supply pipe 27 between the on-off valve 251 and the electromagnetic supply pump 252. The return pipe 253 is provided with an oil temperature detection sensor 254 for detecting the oil temperature of the return oil, a flow rate control valve 255 for proportionally controlling the flow rate of the return oil, and a check valve for flowing the return oil only to the return side. Has been. In addition, the combustion burner 25 is provided with a blower fan 28 for supplying combustion air, and the blower fan 28 is driven at a predetermined rotational speed to drive a required amount of air necessary for combustion. To supply. The rotation speed detection at this time is performed by the rotation speed sensor 281. Then, by changing and adjusting the flow rate of the return oil by the flow rate control valve 255 according to the number of tapping hot water, the change of the spray amount from the combustion burner 25 is performed, so that the combustion amount is proportionally controlled. It has become. 2 denotes an ignition coil, and the combustion burner 25 is ignited by the ignition operation of the ignition coil 256.
[0029]
As shown in FIG. 3, the system controller 3 is connected to a main remote controller 31, and includes a number control unit 32 and a complementary operation control unit 33 as a complementary operation control means. The system controller 3 may be provided separately from each of the water heaters 2a, 2b, 2c, or may be incorporated in any one of the water heaters (2c in the example of FIG. 1). In the following description, the case where the first water heater 2a is assigned as the main water heater, and the second and third water heaters 2b, 2c are assigned as the sub water heaters, the corresponding individual controllers 29a, 29b, 29c and the external solenoid valves will be described. 5a, 5b and 5c are used with first to third , respectively.
[0030]
The number control unit 32 changes and adjusts the number of hot water heaters 2a, 2b, 2c to be operated in accordance with the hot water supply load (heat load) at the time of hot water use at the hot water tap 6, and The role is assigned as a main water heater (a water heater that is initially ignited) and the other as a sub water heater (a water heater that is sequentially ignited when the required amount of heat cannot be satisfied by the main water heater). It should be noted that such role setting of the main water heater and the sub water heater is set so as to be sequentially changed every predetermined period (for example, 24 hours), so that the combustion frequency is substantially uniform.
[0031]
For example, if the capacity of a single hot water supply is No. 50 (flow rate is 50 L / min), if the required hot water discharge capacity is less than 90% of No. 45, only the main water heater is operated for combustion. While the supplemental request command for additionally combusting one of the sub-water heaters 2b or 2c in addition to the main water heater is output to the supplemental operation control unit 33 to perform additional combustion, the required hot water discharge capacity after the additional combustion is achieved. If it becomes small, the stop instruction | command which stops combustion of the sub water heater in additional combustion will be output to the said supplementary operation control part 33, and combustion will be stopped. In addition, the numerical value itself of the above number is an example.
[0032]
When the first water heater 2a is set as the main water heater and the second and third water heaters 2b and 2c are set as the sub-water heaters as described above, the hot water supply is not used. In this state, the first external solenoid valve 5a is normally kept open, and the second and third external solenoid valves 5b and 5c are kept closed. That is, the water supply path 4 and the hot-water tap 6 are maintained in a state where they are communicated only via the first water heater 2a and the first external electromagnetic valve 5a.
[0033]
When the hot water tap 6 is opened, water enters the water inlet 22 of the first water heater 2a from the water supply passage 4 through the water inlet 220, and the incoming water flow becomes equal to or higher than the minimum operating flow MOQ (detected by the incoming water flow sensor 221). The combustion burner 25 is combusted and hot water heated at the heat exchanger 21 is discharged to the hot water supply passage 7 through the hot water supply passage 23, the hot water outlet 230 and the open external electromagnetic valve 5a. Hot water is supplied to the hot water tap 6.
[0034]
Next, the complementary operation control by the complementary operation control unit 33 will be described with reference to the flowchart of FIG. 4 including a part of the combustion of the main water heater (first water heater) 2a. First, for example, when the operation switch of the main remote controller 31 is turned on, the incoming water flow rate of the main hot water heater 2a is monitored, and when the detected incoming water flow rate from the incoming water flow rate sensor 221 exceeds MOQ, the main hot water heater 2a detects the first individual controller. The combustion operation is performed by 29a (YES in step S1, step S2). This continues until the complement request command is output from the number control unit 32 (NO in step S3). When the complement request command is output, the supplemental operation control unit 33 that has received the sub request water heater (second water heater) ) Operation control for 2b is performed via the second individual controller 29b (YES in step S3). When the supplement request command is output, first, the blower fan 28 of the sub water heater 2b is activated to start the pre-purge process (YES in step S3, step S4). Then, if the rotational speed of the blower fan 28 reaches a predetermined pre-purge rotational speed (the rotational speed at which the ignition operation can be performed) based on the detection information from the rotational speed sensor 281 (YES in step S5), the second The external solenoid valve 5b is opened to allow water to enter the sub water heater 2b from the water inlet 220, while the opening of the can body water amount adjusting valve 232 and the bypass valve 241 is controlled based on the set hot water temperature set in the main remote controller 31. (Step S6).
[0035]
If the incoming flow rate sensor 221 detects an incoming flow rate equal to or higher than the MOQ by opening the second external solenoid valve 5b (YES in step S7), is a predetermined cut condition established for the incoming incoming temperature detected by the incoming water temperature sensor 222? It is determined whether or not (step S8). In this determination, if the detected incoming water temperature is lower than the predetermined determination temperature, the cut condition is not satisfied and the combustion permission condition is satisfied. On the other hand, if the detected incoming water temperature is higher than the determination temperature, the cut condition is satisfied and the combustion permission condition is satisfied. Judge that there is no. The above judgment temperature is set to prevent the boiling and overheating because the upper limit temperature value is set so that if the incoming water temperature is higher than that, it will boil or overheat when it is burned. It has been. In other words, if the incoming water temperature is higher than the determination temperature, combustion is prohibited even if a complement request command is output, whereas if it is lower than the determination temperature, combustion is permitted. In the above description, the water pipe is exemplified as the water supply source of the water supply channel 4 of the present embodiment, but the above determination is made assuming a case where a solar water heater is connected to the water supply source and the hot water is supplied. Like to do.
[0036]
If it is determined in step S8 that the combustion permission condition is not satisfied, that is, if the cut condition is satisfied (YES in step S8), a predetermined time period after detecting the incoming water flow rate equal to or higher than the MOQ in step S7. Until (for example, 5 seconds) elapses (NO in step S9), it is confirmed that no stop request is output (NO in step S11), and the determinations in steps S7 and S8 are repeated. In other words, the change in the detected incoming water temperature is observed while the pre-purge process is continued until the predetermined time elapses. On the other hand, if the combustion permission condition is not satisfied even after the predetermined time has elapsed (YES in both steps S8 and S9), the pre-purge process of the sub water heater 2b is stopped and then the above steps S11, S7, Each determination of S8 is repeated (step S10).
[0037]
On the other hand, if it is determined in step S8 that the combustion permission condition is satisfied, that is, if the cut condition is not satisfied (NO in step S8), the ignition coil 256 of the sub-water heater 2b is operated to turn on the combustion burner 25. Ignite and burn (step S13). And if a stop request | requirement is output, it will transfer to the control for a combustion stop (it is YES at step S11).
[0038]
According to the above, if the complement request command is output, the pre-purge process is executed in advance and the blower fan 28 is brought into a blowable operation state that can be ignited. Therefore, if the incoming water temperature satisfies the combustion permission condition, the combustion burner 25 is immediately turned on. It is possible to ignite, and it is possible to reliably avoid an ignition delay when the pre-purge process is started after waiting for the incoming water temperature to satisfy the combustion permission condition. In addition, since the pre-purge process is continued for a predetermined time, even if a high temperature is detected by the incoming water temperature sensor 222 immediately after the complementary request command is output and after the previous combustion operation is stopped, the water supply path 4 If the detection of the high temperature is canceled by the water supply from and the combustion permission condition is satisfied, the combustion burner 25 can be immediately ignited as described above, and the occurrence of the ignition delay can be avoided.
[0039]
<Other embodiments>
In addition, this invention is not limited to the said embodiment, Various other embodiments are included. That is, in the above-described embodiment, an example in which the connected water heater is configured using the oil water heaters 2a, 2b, and 2c as the water heater is shown, but the present invention is not limited to this, and the gas water heater is used as the water heater. You may make it comprise a type | mold hot-water supply apparatus.
[0040]
In the above embodiment, the pre-purge process is stopped after the elapse of a predetermined time (steps S9 and S10). However, not limited to this, the stop process in steps S9 and S10 is omitted, and the pre-purge process is requested as a supplement request command. You may make it continue as long as it is output. That is, even if the detected incoming water temperature does not satisfy the combustion permission condition in step S8, the pre-purge process is continued.
[0041]
In the above-described embodiment, the pre-purge process is performed so that the air blowing fan is in a predetermined air blowing operation state (YES in step S5), and the determination in step S8 is performed on the detected incoming water temperature. If the supplement request command is output, first, it is determined whether or not the detected incoming water temperature as in step S8 satisfies the combustion permission condition. On the other hand, whether the determination result satisfies the combustion permission condition or not, In this case, the bri purge process after step S4 may be forcibly started. In this case, the fact that the detected incoming water temperature satisfies the combustion permission condition is a condition for executing ignition by the ignition operation of the sub water heater 2b.
[0042]
Furthermore, in the said embodiment, in order to connect the hot water supply path 23 of each water heater 2a, 2b, 2c with the hot water supply path | route 7 so that opening / closing switching is possible, the external solenoid valves 5a, 5b, 5c which are opening / closing switching valves are used. However, the present invention is not limited to this, and the can body water amount adjusting valve 232 and the bypass valve 241 disposed in each of the water heaters 2a, 2b, and 2c are of a type that can be completely closed (can be fully closed). Also good. In this case, the hot water supply passage 23 and the hot water supply passage 7 can be shut off by controlling the closing of the can body water amount adjusting valve and the bypass valve with a complete closing function, while the open switching control is performed. Can communicate with each other. In the flowchart of FIG. 4, instead of the processing content described in the above embodiment, the can body water amount adjustment valve and the bypass valve that have been closed and controlled to the fully closed state are opened as the processing content of step S <b> 6. At the same time, the opening degree adjustment based on the set hot water temperature or the like may be performed.
[Brief description of the drawings]
FIG. 1 is an overall schematic diagram showing an embodiment of the present invention.
FIG. 2 is a schematic diagram showing the configuration of each water heater.
FIG. 3 is a block diagram of a system controller and the like.
FIG. 4 is a flowchart mainly showing the contents of complementary operation control.
[Explanation of symbols]
2a, 2b, 2c Water heater 6 Hot water tap (hot water supply destination)
7 Hot-water supply path 22 Inlet path 23 of each hot-water supply unit Hot-water supply path 25 of each hot-water supply system Combustion burner 28 Blower fan 32 Number control unit 33 Complementary operation control unit (complementary operation control means)
222 Water temperature sensor

Claims (4)

Unit control that changes the number of hot water heaters to be operated in accordance with the heat load of the hot water supply destination by connecting each hot water outlet in the plurality of hot water heaters to a common hot water supply route following the hot water supply destination so as to be openable and closable. Complementary to the connected hot water supply apparatus configured to be performed and ignited and burned with the combustion burner being supplied with combustion air from the blower fan as a combustion operation of each of the water heaters An operation control method comprising:
When a supplementary request command is received to supplement additional hot water heaters that have stopped combustion separately from hot water heaters that are in combustion, they are detected by an incoming water temperature sensor that is interposed in the water inlet of the hot water heater that has stopped combustion. Even when the detected temperature does not satisfy a predetermined combustion permission condition for the incoming water temperature, the pre-purge process is started by forcibly starting the blower fan of the hot water heater in which the combustion is stopped, and the combustion burner can be ignited. A supplementary operation control method for a connected hot water supply device, characterized in that the air blowing operation state is maintained. It is a complementary control method of the connected hot water supply device according to claim 1 ,
The pre-purge process is continued even after the blower fan has risen to a predetermined blowing operation state, while the pre-purge process is stopped when the incoming water temperature detected by the incoming water temperature sensor does not satisfy the combustion permission condition. A complementary operation control method for a connected hot water supply apparatus. A complementary operation control method for a connected hot water supply device according to claim 1 ,
A connected type hot water supply device that performs open switching control so that the hot water outlet path of the hot water heater that is not in combustion is communicated with the hot water supply path after the blower fan is brought into an air blowing operation state in which the combustion burner can be ignited by the pre-purge process. Complementary operation control method. Unit control that changes the number of hot water heaters to be operated in accordance with the heat load of the hot water supply destination by connecting each hot water outlet in the plurality of hot water heaters to a common hot water supply route following the hot water supply destination so as to be openable and closable. Each of the hot water heaters is configured to be performed, and a combustion burner that is ignited and burned in a state where the supply of combustion air from a blower fan is received, and the incoming water from the inlet channel is heated by the combustion heat of the combustion burner In a connected hot water supply apparatus configured to include a heat exchanger that discharges hot water into a hot water outlet,
Complementary operation control means is provided for controlling the supplementary operation by the hot water heater that is in the combustion stop state when receiving a supplement request command that complements the hot water heater that is in a combustion stop state that is different from the hot water heater that is in the combustion active state. ,
Even if the detected temperature detected by the incoming water temperature sensor interposed in the incoming water channel of the hot water heater that is stopped in combustion does not satisfy the predetermined combustion permission condition for the incoming water temperature, the complementary operation control means A connected hot water supply apparatus configured to forcibly start a blower fan of a hot water heater in a state where combustion is stopped to start a pre-purge process.

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