JP3359104B2 - Large capacity hot water supply system and its operation control method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to relates to a large-capacity hot water system and its operation control method that includes a hot water storage tank.

[0002]

2. Description of the Related Art When large-capacity hot water is temporarily used in apartments, apartments, single dormitories and public baths with large baths, large-scale homes, restaurants, etc., the large-capacity hot water supply load can be tolerated. A large capacity hot water supply system is provided.

FIG. 18 shows a general high-capacity hot water supply system of this kind. This large-capacity hot water supply system includes a heat source unit 3 including a plurality of hot water supply heat sources (water heaters) 2 a to 2 d in a case 1, a hot water storage tank 4 for storing hot water generated by the heat source unit 3, And a pump unit 6 with a built-in hot water supply circulation pump 5 for circulating the hot water in the hot water storage tank 4 to each home such as an apartment, etc., and each hot water supply heat source unit 2a of the heat source unit 3
Hot water supply heat sources 2a to 2d
The hot water circulating pipe is drawn by using the return pipe 8 which drives the outgoing pipe 7 for supplying the hot water produced in Step 1 to the hot water storage tank 4 and the hot water circulation pump 40 to draw out the hot water from the hot water storage tank 4 and leads to each of the hot water supply heat sources 2a to 2d. Road 10 is interposed. Further, between the hot water storage tank 4 and the pump unit 6, the suction side pipe 11 for sucking the hot water in the hot water storage tank 4 into the hot water supply circulation pump 5 and the hot water discharged from the hot water supply circulation pump 5 are supplied to the hot water supply destination of each household. A hot water supply circulation line 12 is provided by a water supply pipe 9 that is turned around and returned to the hot water storage tank 4.

The return pipe 8 of each of the hot water supply heat sources 2a to 2d is provided with a valve 13 and a check valve 15, and the forward pipe 7 of each of the hot water supply heat sources 2a to 2d is provided with a valve 16. I have.
These valves 13 and 16 are always kept open and closed at the time of repair and inspection.

[0005] Each hot water supply heat source device is constructed in the same manner as a normal hot water supply device, and includes therein a flow sensor for detecting the flow rate of water, a heat exchanger for heating the flow of hot water (hot water), and a heat exchanger. A burner for burning and heating, a proportional valve for controlling an amount of gas supplied to the burner, an incoming water temperature sensor for detecting an incoming water temperature, an outgoing water temperature sensor for detecting an outgoing water temperature, and a combustion fan for supplying and discharging burner combustion. And a heat source controller for controlling hot water supply combustion, and a remote controller (not shown) is connected to the heat source controller.

The hot water storage tank 4 is provided with a first temperature switch 17 at a lower position and a second temperature switch 18 at a middle position, and switch signals of these temperature switches 17, 18 are transmitted to a system controller. The system control unit 20 controls the sequence of the system.

In this type of large capacity hot water supply system,
Hot water at the set temperature is filled in hot water storage tank 4 as follows. First, the water supplied from the water supply pipe 21 is supplied to the hot water circulation pipe 10.
The hot water supply heat sources 2a to 2d are introduced into one or a plurality of the hot water supply heat sources 2a to 2d through the return pipe 8, and the combustion of these hot water supply heat sources 2a to 2d is controlled. Hot water at the set temperature is produced, and the produced hot water is supplied to the hot water storage tank 4 through the outward pipe 7 so that the hot water storage tank 4 is filled with the hot water at the set temperature.
Each household is ready for hot water supply.

When hot water is used in each home (dwelling unit), the amount of hot water in the hot water storage tank 4 decreases. To compensate for this, water enters the hot water storage tank 4 from the water supply pipe 21. The entered water accumulates on the bottom side of the hot water storage tank 4. As the use of hot water in each household continues, the level of water that has entered the hot water storage tank 4 rises, and when this water level exceeds the first temperature switch 17, the first temperature switch 17 causes the temperature of the hot water to drop. It senses and outputs a switch signal. Upon receiving this switch signal, the system controller 20 drives, for example, two of the four hot water supply heat sources 2a to 2d, and drives the hot water supply pipe 21.
(Or water from the water supply pipe 21 and water drawn from the hot water storage tank 4) is heated by the hot water supply heat sources 2a and 2b and supplied to the hot water storage tank 4 to keep the hot water in the hot water storage tank 4 warm.

[0009] When a large amount of hot water is used in each household, the low-temperature water level is further increased. When the water level exceeds the second temperature switch 18, the second temperature switch 18 detects a drop in the hot water temperature and outputs a switch signal. In response to the signal, the four hot-water supply heat sources 2a to 2d are fully operated to supply water.
The water supplied from the hot water storage tank 4 (or the water supplied from the water supply pipe 21 and the low-temperature hot water drawn from the hot water storage tank 4) is heated and circulated to the hot water storage tank 4 to keep the hot water in the hot water storage tank 4 warm.

When the use of hot water in each home is stopped, the level of the low-temperature water level in the hot water storage tank 4 is reduced by the heat retaining operation of the hot water supply heat sources 2a to 2d, and the first temperature switch 17 and the second temperature switch When both 18 no longer detect a drop in hot water temperature, it is determined that the hot water temperature in hot water storage tank 4 has reached the set temperature, and the warming operation of hot water supply heat sources 2a to 2d is stopped. On the other hand, when the hot water circulation pump 5 is driven, the hot water in the hot water storage tank 4 is circulated through the hot water circulation pipe 12, and the hot water in the hot water circulation pipe 12 is greatly cooled from the set temperature by natural cooling. Is prevented.

[0011]

In the conventional large-capacity hot water supply system, when the second temperature switch 18 outputs a switch signal, all the hot water supply heat sources 2a to 2d are driven. When the switch signal is output from the switch 17, the two hot water supply heat sources are driven. During the operation of these two units, the hot water supply load
And the switch signal is output from the second temperature switch 18.
When the power is supplied, all the hot water supply heat sources 2a to 2d
At this time, the stopped hot water supply heat source
Hot water storage tanks for each hot water supply heat source that are stopped when operated simultaneously
A large amount of cold water in the pipeline leading to the hot water storage tank
And low-temperature hot water is supplied to each dwelling unit from the hot water storage tank.
The problem arises.

The present invention has been made to solve the above-mentioned conventional problems, and an object of the present invention is to determine whether a hot water supply load is low.
The load is switched to a higher load, and all hot water supply heat sources are activated.
Even when the hot water supply heat source side was in a stopped state,
Cold hot water in the road enters the hot water storage tank all at once,
In the hot water temperature in the tank to provide a large capacity hot water system and its operation control method capable of suppressing a decrease.

[0013]

The present invention is configured as follows to achieve the above object. That is, the operation control method of the large capacity hot water supply system of the present invention includes a plurality of hot water supply heat sources, accumulates the hot water produced by these hot water supply heat sources in the hot water storage tank, and stores the hot water in the hot water storage tank into the hot water supply heat source device. through by hot water circulation performs insulation of the hot water storage tank indoor bath, the operation control method of a large capacity hot water supply system by circulating hot water for hot water supply circulation pipeline performs insulation conduit indoor bath orbiting each hot water destination from the hot water storage tank, the Under the hot water storage tank
1st temperature sensor in the position, 2nd temperature in the higher direction
Sensors are provided to detect the temperature of hot water in the hot water storage tank
Water supply to the hot water storage tank and the hot water supply heat source
The hot water is drawn into the hot water storage tank by the first temperature sensor.
Hot water produced by the hot water supply heat source
Is a hot water storage tank at a position above the second temperature sensor.
Hot water from the hot water storage tank
From above the second temperature sensor of the
Inspection in the hot water storage tank detected by the first or second temperature sensor
The output temperature is estimated for each of the first and second temperature sensors.
The hot water supply load is high when the temperature is
Judging the load state, all the hot water supply heat sources are driven and the hot water storage
Performs the heat-retention operation of the indoor bath and detects the temperature detected by the second temperature sensor.
Degree is higher than the high load determination temperature, and
The temperature detected by the first temperature sensor is used to determine a predetermined low load.
When the load is within the temperature range, a predetermined number of the hot water supply heat sources of all the number of hot water supply units are operated to perform warming operation of the hot water in the hot water storage tank, and when the load shifts from the low load state to the high load, all the The hot water supply heat source is made movable, and when shifting from this low load operation number to the high load all number operation state, the stopped hot water supply heat source is activated one by one or several units at a time delay. It is characterized by doing. Further, the large capacity hot water supply system of the present invention includes a plurality of hot water supply heat sources, accumulates hot water produced by these hot water supply heat sources in a hot water storage tank, and circulates hot water in the hot water storage tank through the hot water supply heat source device. In the large-capacity hot water supply system for keeping the temperature of the hot water in the hot water storage tank by keeping hot water in the hot water storage tank and circulating hot water from the hot water storage tank to a hot water supply circulation pipe around each hot water supply destination, the hot water storage tank has 1 temperature
Temperature sensor, a second temperature sensor in the upper direction
The hot water storage tank is provided to detect the temperature of hot water in the hot water storage tank.
Hot water from the hot water storage tank to the hot water supply heat source side
Discharge is below the first temperature sensor of the hot water storage tank
And the hot water produced by the hot water supply heat source is heated to the second temperature.
At a position above the temperature sensor and into the hot water storage tank.
Delivery of hot water from the hot water tank is performed by the second hot water storage tank.
The first temperature is set higher than the temperature sensor.
Hot water storage tank detected by temperature sensor or second temperature sensor
The detected temperature inside the sensor is different from the temperature of the first and second temperature sensors.
When the temperature is lower than the predetermined temperature for determining high load,
Judge that the load is in a high load state and drive all the hot water supply heat sources.
Performs the heat retention operation of the hot water in the hot water storage tank, and
The detected temperature is higher than the high load determination temperature, and
When the temperature detected by the first temperature sensor is a predetermined low load
When the load is low within the fixed temperature range, a predetermined number of the hot water supply heat sources of all the number is operated to perform the heat retaining operation of the hot water in the hot water storage tank, and the load shifts from the low load state to the high load. Sometimes, a hot water temperature control unit that operates all the hot water supply heat sources, and when shifting from the low load operation number to the high load operation number of all operation units, one or several stopped hot water supply heat source units are stopped. And an additional activation control unit that activates the units at staggered times.

[0014]

According to the present invention, the hot water supply load is switched from a low load to a high load.
In other words, when all the hot water heaters are driven,
Do not drive the hot water supply heat sources in the stopped state one at a time
Are driven at different times by several units, so
A large amount of cold water from the pipeline side of all hot water supply heat sources
Hot water is prevented from entering the hot water storage tank,
The temperature drop of the hot water inside is suppressed.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. In the invention of the present embodiment, the same parts as those of the conventional example are denoted by the same reference numerals, and the description thereof will not be repeated. 1 to 3 show a configuration of a large capacity hot water supply system in the present embodiment.

The present embodiment is different from the conventional example in that a plurality of hot water supply heat sources 2a to 2h and two hot water supply circulation pumps 5 are integrated into a unit case 22 to form a unit. A hot water circulating pump 14 is provided in the return pipe 8 between the valve 13 and the check valve 15 of each of the hot water supply heat sources 2a to 2h, and a first temperature switch 17 and a second temperature in the hot water storage tank 4 are provided. temperature sensor T ₃ as a first temperature sensor comprising a thermistor or the like in place of the switch 18, a second temperature
Using the temperature sensor T ₄ as degree sensor, further, the provided temperature sensors T _1, T _2, such as a thermistor, in the hot water circulation pipe 10, a temperature sensor T _5, such as a thermistor, as well to hot water circulation _pipe, T ₆ Is provided, and system control is performed using these temperature sensors T _{1 to} T ₆ , and the rest is the same as the above-described conventional example. It is clear from FIG.
As such, lower than the temperature sensor T ₃ of the hot water storage tank 4
Water supply to the hot water storage tank 4 using the pipeline 8 on the
The hot water is drawn out of the hot water supply source from the tank 4
Hot water produced by the source device is a temperature sensor T ₄ through往管7
To the upper part of the hot water storage tank 4 which is located above the
The hot water in the hot water storage tank 4 is stored in the temperature sensor T of the hot water storage tank 4.
₄ to the hot water supply destination via the hot water circulation line 12 from above.
Has been issued.

As shown in FIG. 4, the system controller 23 of this embodiment receives a signal from the corresponding temperature sensor T _{1 to} T ₆ and controls the temperature of the hot water in the hot water storage tank 4.
And a hot water supply circulation control unit 19 for circulating the hot water in the hot water storage tank 4 to the hot water supply destination, a rotation control unit 25 for controlling the rotation of the hot water supply heat sources 2a to 2h, and a temperature control of the hot water in the hot water storage tank 4. An alternative security control unit 26 that substitutes another temperature sensor when a failure occurs in the temperature sensor used for the operation, and an additional activation control unit 27 that controls the timing of additional activation when increasing the number of operating hot water heaters And a function stop operation unit 28 for stopping the control operation of the hot water in the hot water storage tank 4 only when the system power is turned on, and when the pumps 5 and 14 do not start normally or when the spot ignition operation of the hot water supply heat source device is performed normally. A retry operation unit 29 that repeats the re-operation when not performed, and also makes a failure determination at the same time. Hereinafter, the operation of each of these units will be described.

FIGS. 5 to 7 schematically show the warming operation of the hot water temperature control section 24. FIG. FIG. 5A shows a state in which the inside of the hot water storage tank 4 is filled with hot water at a set temperature (in this example, 60 ° C.).
, The hot water in the hot water storage tank 4 is circulated through the hot water supply circulation pipe 12. In this state, as shown in (b) of the figure, when a small load state occurs in which hot water is used in some dwelling units (homes) and a small amount of hot water is used, hot water used from the water supply pipe 11 is removed. Water to be refilled enters the bottom side of the hot water storage tank 4. Since the water level of the intruding water in the hot water storage tank 4 does not reach the water level of the temperature sensor T _3, the temperature sensor T ₃ does not detect a drop in water temperature, Therefore, the hot water supply heat source circuit 2a~2c is stopped Has been maintained.

As shown in FIG. 2C, when the hot water is continuously used, the level of the low-temperature hot water in which the water entering the hot water storage tank 4 and the hot water in the hot water storage tank 4 are mixed becomes lower. will exceed the water level of the temperature sensor T _3, receives the temperature detection signal of the temperature sensor T _3, hot water temperature control unit 24 drives the one of the hot water supply heat source circuit 2a, the return from the water supply pipe 21 pipe 8
The water supplied through the hot water is heated to a set temperature, and the hot water at the set temperature is supplied to the hot water storage tank 4 through the outward pipe 7.

In this state, as shown in FIG.
Becomes a high load hot-water supply state is started using hot water in other dwelling unit, further increases the level of low-temperature water in the hot water tank 4, when the level exceeds the level position of the temperature sensor T _4, the temperature sensor T ₄ In response to the temperature detection signal, the hot water temperature control unit 24 operates all the hot water supply heat sources 2a, 2b, and 2c fully, and supplies the water supplied from the water supply pipe 21 to the hot water supply heat source. The hot water is supplied to the hot water storage tanks 4a, 2b, and 2c and heated, and a large amount of hot water having a set temperature generated by all the hot water supply heat sources is supplied to the hot water storage tank 4.

Next, as shown in FIG. 6 (b), when the use of hot water in other dwelling units is stopped and a low-load hot water supply state is established, all the hot water supply heat sources continue to operate fully. Then, in addition to the water supplied from the water supply pipe 21, water is also drawn from the bottom side of the hot water storage tank 4 and heated by the hot water supply heat sources 2a to 2c to send hot water at a set temperature into the hot water storage tank 4. With the operation of all the hot water supply heat sources, the water level lower than the set temperature in the hot water storage tank 4 gradually decreases, and as shown in FIG.
The low-temperature hot water in which the water from 21 and the hot water drawn from the hot water storage tank 4 are mixed is guided to each of the hot water supply heat sources 2a to 2c, and the heat retaining operation is similarly performed.

As shown in FIG. 7 (a), when the use of hot water is stopped and a load is not applied, low-temperature hot water is guided from the lower side of the hot water storage tank 4 to each of the hot water supply heat sources 2a to 2c. As a result of being heated and returned into the hot water storage tank 4, the temperature of the hot water in the hot water storage tank 4 becomes close to the set temperature. Further, when the warming operation is continued as shown in FIG. 3B, the temperature of the hot water drawn out from the lower part of the hot water storage tank 4 becomes the set temperature, and when this temperature is detected by T ₁ provided in the return pipe 8. Then, hot water temperature control unit 24 determines that the hot water in hot water storage tank 4 has been filled with hot water of the set temperature, and supplies hot water
The driving of 2c is stopped, and the temperature is initially kept at the temperature shown in FIG.

FIG. 8 is a flow chart showing the warming operation of the hot water circulation together with the operation of the retry operating section 29. Describing this flowchart,
Upon thermal insulation behavior of the hot water of the hot water tank 4, first, at step 101, the temperature at which the temperature detected by the temperature sensor T ₄ which is installed in the hot water storage tank 4 corresponds to the reference load, that is, pre
It is determined whether or not the given high load determination temperature is 56 ° C. or less. To the set temperature 60 ° C., when the detected temperature of the temperature sensor T ₄ is 56 ° C. or less, it is judged that the state of high load hot-water supply performs heat retaining operation to full drive the total number of hot-water supply heat source unit in step 102. The number of hot water supply heat sources installed in the device case 22 of the hot water supply system varies depending on the model, for example, eight for the B8 type, six for the B6 type, and B4.
Four hot water supply heat source units are installed in the type and three hot water supply heat source units are installed in the B3 type. In each type, the hot water circulation pumps 14 of all the hot water supply heat source units are activated to perform full driving.
The temperature sensor T is also used in step 113 described later.
40 ° C or less of the temperature for high load judgment given in advance by ₃ .
Is detected, the hot water circulation pumps of all
Start the pump and it will be fully driven.

In step 103, it is determined whether or not the flow sensors in each of the hot water supply heat sources driven by the pump are turned on. When the flow sensor is turned on, the ignition operation of each hot water supply heat source device is performed, and in step 105, it is confirmed whether or not an error signal is output from each hot water supply heat source device. When an error signal has not been generated, the hot water supply heat source unit judges that that the normal operation, the temperature of the hot water to be drawn to the hot water supply heat source unit detected by the temperature sensor T ₁ from the hot water tank 4 at step 106,
It is determined whether or not the detected temperature is equal to or higher than 58 ° C. When the detected hot water temperature is lower than 58 ° C., all the hot water supply heat sources are continuously driven to perform the heat retaining operation. When the temperature detected by the temperature sensor T ₁ is it becomes 58 ° C. or more, determines that becomes low load hot-water supply state, continue to drive the two hot-water supply heat source unit in step 107, to stop the rest of the hot water supply heat source circuit.

[0025] Then, continues to monitor the temperature detected by the temperature sensor T ₁ at step 108, the detected temperature is judged whether it is above 60 ° C.. Until the detected temperature reaches 60 ° C., the two hot water supply heat sources are driven to continue the heat keeping operation.
When the detected temperature of the temperature sensor T ₁ is becomes 60 ° C. or more, the hot water of the hot water storage tank 4 is determined to have been filled with hot water set temperature 60 ° C., stop the two hot-water supply heat source unit that has been driven I do.
If an error flag has been set in the operation of the hot water supply heat source device before, the flag is deleted and the system stands by for the next hot water supply.

When the ON signal is not output from the flow sensor in the hot water supply heat source unit in step 103, the air stays in the hot water circulation pump 14 or the like, and the driving of the hot water circulation pump 14 is not performed normally. , The start operation of the hot water circulation pump 14 is repeatedly performed by the retry operation unit 29 at intervals of one minute. This hot water circulation pump 1
If the ON signal is not output from the flow sensor even after the start operation of Step 4 has been performed five times, the hot water circulation pump 14 is determined to be in a failure state, and a display unit (not shown) of the system control device is provided.
Error display.

When an error signal is output from the hot water supply heat source in step 105, the air has accumulated in the gas pipe of the fuel gas supplied to the hot water supply heat source, or the fire is cut off due to strong wind or the like. In consideration of the disappearance, the retry operation unit 29 repeats the ignition operation four times at one minute intervals. When the hot water supply combustion is normally performed by repeating this ignition operation, the operation after step 106 is performed. When the ignition is not performed normally even after the four ignition operations are repeated, it is determined that the hot water supply heat source is in a failure state, and the automatic operation is performed. A trouble report is sent to the central control room of the hot water supply heat source unit or the after-sales service station by telephone or radio. At the after-sales service station, the operating status is confirmed by remote control using a telephone line or the like after the report, and appropriate measures and dispatch of service personnel are performed.

[0028] When the temperature detected by the temperature sensor T ₄ is greater than 56 ° C. at step 101, then the temperature detected by the temperature sensor T ₃ at the step 113 is monitored. When the temperature detected by the temperature sensor T ₃ is lower than have exceeded 40 ° C. 50 ° C., it is determined that the medium load hot-water supply state, in each type of B4, B6, B8 start the hot water circulation pump four hot-water supply heat source circuit To perform warming operation. In step 115, it is determined whether or not the flow sensor in the hot water supply heat source that has started the hot water circulation pump 14 is turned on. If there is a hot water supply heat source that does not turn on the flow sensor, the hot water circulation of the hot water supply heat source The pump is stopped, and the hot water circulation pump of the alternative hot water supply heat source is started to drive a predetermined number of hot water supply heat source devices. Then, an error flag is set for the hot water supply heat source device for which the flow sensor has not been turned on.

In step 116, the ignition operation is performed for the hot water supply heat source in which the flow sensor is turned on. In step 117, it is confirmed whether or not an error signal is output. When an error signal is output, it is determined that ignition has not been performed properly, and after the hot water circulation pump of the hot water supply heat source that has output the error signal is stopped and an error flag is set, another error is set. The circulating hot water pump of the alternative hot water supply heat source is started to perform an ignition operation, and after confirming that no error signal is output, the operations from step 118 to step 122 are performed. This step
The operations of steps 118 to 122 are the same as the operations of steps 106 to 110 described above.

[0030] a temperature range for a low load determination temperature detected by the temperature sensor T ₃ are predetermined in the step 113, 5
When the temperature is in the temperature range of 0 ° C. or more to 58 ° C. or less, it is determined that the hot water supply is in a low load state, and two hot water supply heat sources are driven to perform a heat retaining operation. In other words, after starting the hot water circulation pumps of the two designated hot water supply heat source devices, the on-signal of the flow sensor in the hot water supply heat source device is checked and the ignition operation is performed, and the hot water supply device in which the on signal is not output from the flow sensor is performed. The operation of the heat source device is stopped, an error flag is set, and the alternative hot water supply heat source device is operated to drive the two hot water supply heat source devices. And
The hot water temperature to be drawn to the hot water supply heat source unit detected by the temperature sensor T ₁ from the hot water tank 4 at step 129, to continue the thermal insulation operation until the detected temperature reaches 60 ° C., the detected temperature is 60 ° C.
When the temperature of the hot water storage tank 4 reaches 60
It is determined that the water has been filled with the hot water of ℃, and the warming operation of the hot water supply heat source device is stopped.

[0031] As described above, in this embodiment, since providing the temperature sensor T _3, T ₄ into the hot water storage tank 4 instead of the temperature switches 17 and 18 of the conventional example, the temperature detected by the temperature sensor T _3, T ₄ Or according to the magnitude of the difference between the detected temperatures of the temperature sensors T ₃ and T ₄ and the temperature change of each temperature sensor,
Since the number of hot water supply heat source devices to be kept warm can be finely selected and controlled, the warming operation of the hot water in the tank can be performed accurately and efficiently.

FIG. 9 is a flowchart showing in more detail the restart operation (retry operation) of the hot water circulation pump in step 111 of FIG. 8 by the retry operation section 29. The operation of this flowchart will be described. First, when an error occurs in the hot water circulation pump of the hot water supply heat source driven in step S1, the hot water circulation pump in which the error has occurred is stopped in step S2, and an error flag is set. The error of the hot water circulation pump is determined by detecting that the ON signal is not output from the flow sensor of the hot water supply heat source even when the pump is started. Next, in step S3, it is determined whether or not all the hot water circulation pumps to be started have been started, and the hot water circulation pumps of all the hot water supply heat sources except for the hot water supply heat source in an error state have been started. After confirming
In step S4, it is determined using a timer or the like whether or not 20 seconds or more have elapsed since the hot water circulation pump started last.

When the time exceeds 20 seconds, a retry operation is performed. This is to prevent three or more hot water heaters from being simultaneously supplied to the hot water storage tank 4 in order to prevent a large amount of low-temperature hot water stored in the outgoing pipes 7 of all the hot water supply heat source devices from which the hot water circulation pumps are started. This is to prevent the vessel from starting.

In step S5, it is similarly determined using a timer or the like whether or not 60 seconds or more have elapsed since the start of the hot water circulation pump start command in which the error occurred. Then, when 60 seconds or more have elapsed, the hot water circulation pump in the error occurrence state is started in step S6. This is based on the assumption that the occurrence of an error in the hot water circulating pump is caused by the accumulation of air or the like in the pump, and by driving the hot water circulating pump other than the one in which the error occurred in step S3, In order to wait for the time for the air in the circulation pump to escape and to wait for dust or the like to come off, after the elapse of this waiting time of 60 seconds, the hot water circulation pump in which an error has occurred is started in step S6. Then, it is determined in step S7 whether an ON signal has been output from the flow sensor in the hot water supply heat source in which the error has occurred, and if an ON signal has been output from the flow sensor, the ignition operation of the hot water supply heat source is performed in step S9. Then, after the hot water supply heat source is operated to boil the hot water in the hot water storage tank 4, the error flag set in step S2 is removed, and the mode shifts to the normal mode.

On the other hand, when the ON signal from the flow sensor is not confirmed in step S7, the hot water circulation pump is stopped in step S10, and the restart operation of the hot water circulation pump is performed every predetermined time, for example, every 20 seconds. It repeats, and each time, it is confirmed whether or not the ON signal is output from the flow sensor. When the ON signal is not confirmed from the flow sensor even after the hot water circulating pump is restarted five times, the hot water circulating pump determines that an error has occurred due to a failure rather than an error due to stagnation of air. Then, an error is displayed on an error display section of the system controller 23, etc., and an error report (failure report) of the hot water circulation pump is made to the central control room or the after-sales service station by an automatic telephone.

Next, the hot water circulation operation of the hot water circulation control unit 19 will be described with reference to the flowchart of FIG. First, in step 201, the first hot water supply circulation pump of the two hot water supply circulation pumps is started. By starting the pump, the hot water in the hot water storage tank 4 circulates through the hot water supply circulation pipe 12.

[0037] After activation of the first hot water circulation pump 5, the temperature sensor T ₆ in step 202, detects the temperature of the hot water returns to the hot water tank 4. It is determined whether or not the detected temperature is 45 ° C. or lower, and when the detected temperature is 45 ° C. or lower, an error is displayed on a monitor display unit (not shown) of the system controller 23, and the system controller 23 automatically outputs the abnormality. A telephone call is sent to the central control room or after-sales service station. Than the detected temperature is 45 ° C. of the temperature sensor T ₆ in high <br/> Itoki is overcurrent protection device of the hot water supply circulation pump in step 203 (not shown) is equal to or activated.

When the hot water supply circulation pump is driven, a normal drive current control range is given by an upper limit value and a lower limit value. When the pump drive current flows beyond this range, the overcurrent prevention device operates. That is, when the apparatus is being operated, an abnormality is displayed on the monitor display unit, and a telephone report for notifying the abnormality to the central control room or the like is made. If the overcurrent protection device is not operating,
Monitoring the temperature detected by the temperature sensor T ₅ at 204, the detected temperature is judged whether 50 ° C. or less. When the detected temperature is 50 ° C. or less, it is determined that an abnormality has occurred because the temperature is too low compared to the warming temperature of 60 ° C. Similarly, an abnormality is displayed on the monitor display unit, and an abnormality report is output by telephone. And
When this abnormality alarm output is notified, the first hot water supply circulation pump is stopped and locked, it is confirmed that the second hot water supply circulation pump is not in a locked state, and the second hot water supply circulation pump is driven to operate the hot water circulation operation. Is performed. When the second hot water supply circulation pump is also in the stop lock state, all operations of the hot water supply system are stopped.

[0039] When the temperature detected by the temperature sensor T ₅ in the step 204 is higher than 50 ° C. is then the detected temperature in step 205 it is determined whether or not 75 ° C. or higher. Detection temperature is
When the temperature is 75 ° C or higher, the temperature is abnormally high compared to the hot water temperature of 60 ° C.
An abnormality is displayed on the display of the monitor, an abnormality alarm is output by telephone, and all of the hot water circulation pump and the hot water circulation pump enter the stop lock state.

[0040] When the temperature detected by the temperature sensor T ₅ is lower than 75 ° C. In the step 205, to continue the hot water circulation of the first hot water circulating pump, by a timer or the like from the time the pump starts at step 201, 29 min 30 It is determined whether or not seconds have elapsed. When 29 minutes and 30 seconds have elapsed, the pump is turned on for 30 minutes.
The operation is stopped for only one second, and air that may enter the hot water supply circulation pipe 12 is discharged. After the 30 second stop period, the first hot water supply circulation pump is activated again to circulate the hot water in the hot water storage tank 4. And the duration of the pump drive is 29
Every 30 minutes, stop for 30 seconds to bleed air from the pipeline. When the drive time of the first hot water supply circulation pump has been 24 hours since the start of step 201, the first hot water supply circulation pump is stopped and rested, and the second hot water supply circulation pump is started and controlled to control the hot water storage tank. The hot water circulation of the hot water in 4 is performed. The first hot water supply circulation pump and the second hot water supply circulation pump operate alternately every 24 hours, so that the operation times of the first and second hot water supply circulation pumps are made uniform.

FIGS. 11 to 14 show examples of the rotation operation of the hot water supply heat source unit by the rotation control unit 25. FIG. FIG. 11 shows a state of rotation when the hot water supply load shifts from a high load state to a low load state via a medium load state. No. No. 1 to No. In the hot water supply system in which eight hot water supply systems are installed, No. No. 1 to No. All eight hot water supply heat sources up to eight are driven to perform a heat retaining operation. During this operation, the No.
The hot water supply heat source of No. 1 is the first in priority driving, The second hot water supply heat source is set as the second in the priority drive, and thereafter, the eighth hot water supply heat source is driven.

When the hot water supply load shifts from the high load state to the medium load state, the four hot water supply heat sources are driven. The hot water supply heat source of No. 3 is the first in priority driving, and No. Up to six hot water supply heat sources are driven. When the hot water supply load shifts to the low load state, The hot water supply heat source of No. 5 is the first in the priority driving order, and the next No. 5 No. 6 is the second hot water supply heat source, 5
And No. The two hot water supply heat sources 6 are driven. Thus, every time the hot water supply load shifts from the high load to the middle load to the low load state, the first priority drive is gradually shifted (in this example, two shifts), and eight hot water supply units are shifted. Equalize the operating time of the heat source unit without bias.

FIG. 4 shows a rotation when the hot water supply heat source device is in a failure state. In the high load hot water supply state, the failure state No. Except for the hot water supply heat source device of No. 4, all the hot water supply heat source devices are driven to perform the heat retaining operation. When shifting to the medium load hot water supply state, The hot water supply heat source of No. 3 is the first in priority driving, No. 4 jumps over the hot water supply heat source unit. The hot water supply heat source of No. 5 is the second, and the first to fourth Nos. 3, No. 5, No. 6, No. The four hot water supply heat sources 7 are driven. When the hot water supply load shifts to the low load state, The hot water supply heat source of No. 6 is the first in the priority drive, and the second No. 6 in the priority drive. 7 hot water heaters and 2
The hot water supply unit is driven to perform a warming operation. When the hot water supply load shifts to the larger direction, the first of the priority driving is 2
No. The hot water supply heat source of No. 8 is the first in priority driving, The hot water supply heat source of No. 1 is the second in the priority drive, and hereinafter, the fault condition No. 1 The hot water supply heat source of No. 4 is skipped and the sixth hot water supply heat source is driven to perform the heat retaining operation.

FIG. 13 shows an example of a rotation when the hot water supply load changes from a high load state to a medium load state or a low load state, and then returns to a high load state and then shifts to a medium load or a low load state. It is. No. when the hot water supply condition is high. One of the hot water supply heat sources is set as the first in priority driving, and a total of eight hot water supply heat source devices are driven to perform a heat retaining operation. Next, when the hot water supply load shifts to the medium load state, the No. 3
Of the hot-water supply heat source of the first priority driving, the fourth No. The four hot water supply heat sources up to 6 are driven to perform a warming operation. Next, when the hot water supply load shifts to the high load state, all eight hot water supply heat source units are driven again to perform the heat retaining operation. The hot water supply heat source of No. 5 is the first in priority driving, The four hot water supply heat sources up to 8 are driven to perform a warming operation.

FIG. 14 shows a state where the medium load or the low load state is continuously operated for a predetermined period of time, for example, 12 hours, and then the operation is performed by forcibly rotating and replacing with another hot water supply heat source unit. Things. In the example of FIG. 14, rotation in a low load state is shown, and the continuous operation for the first 12 hours The first hot water supply heat source is the first priority drive,
No. No. 1 and No. 2. Continuously operate the two hot water supply heat sources.
Then, when 12 hours have passed, this time No. The hot water supply heat source of No. 3 is the first in priority driving, 3 and No. Run the hot water supply heat source No. 4 continuously for 12 hours. In this way, by shifting the first hot water supply heat source of priority drive in order every 12 hours, the operating time of the hot water supply heat source can be made uniform.

FIGS. 15 and 16 show the alternative security control unit 26.
Is an example of the operation shown in the flowchart. 15 After raised boiling hot water in heat insulating operation, when performing the stopping of hot water circulation pump, replaced by a temperature sensor T ₂ are when the temperature sensor T ₁ is failed, the temperature sensor T ₃ when the well temperature sensors T ₂ failed Instead.
This operation will be described with reference to the flowchart of FIG. 15. First, in step 301, it is confirmed that the ignition operation of the hot water supply heat source device has been normally performed, and in step 302, the temperature sensor T ₁
It is determined whether or not has failed. If there is no failure, the operations of steps 303 to 306 are performed, and the hot water storage tank 4
Perform the warming operation of the hot water inside. Temperature sensor T in step 307 when the temperature sensor T ₁ is failed is detected
It is determined whether or not ₂ is out of order. When the temperature sensor T ₂ is not defective performs heat keeping operation by substituting the temperature sensor T ₁ using the temperature sensor T _2.

[0047] That is, it is determined whether the temperature detected by the temperature sensor T ₂ is 67 ° C. or higher in step 308, the thermal insulation operation when the hot water returned is heated from the hot water supply heat source unit to the hot water tank 4 is less than 67 ° C. subsequently performed, when the temperature detected by the temperature sensor T ₂ is equal to or higher than 67 ° C. to stop the decision incubated operation shall hot water in the hot water tank 4 is filled with 60 ° C. hot water set temperature. And determines whether the temperature sensor T ₃ or a fault condition in step 309 when it is determined that the temperature sensor T ₂ has failed in step 307, when even the temperature sensor T ₃ has failed to stop the heat insulation behavior. Temperature sensor T
_{When 3} is determined to be not faulty performs insulation operation by using the temperature sensor T _3. That is, it is determined whether the temperature detected by the temperature sensor T ₃ is 61 ° C. or higher in step 310, it continues to perform heat keeping operation when a lower hot water temperature than 61 ° C., the detected temperature is 61 ° C. or more temperature sensors T ₃ When it is determined that the hot water in the hot water storage tank 4 has been completely filled with the hot water of the set temperature of 60 ° C., the hot water supply heat source device is stopped, and the heat retaining operation is ended.

In the above case, the temperature sensors T ₁ ,
T _2, although when T ₃ are all failed to stop the thermal insulation operation at step 311, it is possible to perform the substitute to kept operating a temperature sensor T ₄ without stopping it. In this case, the operation in step 309 may be performed by replacing the temperature sensor T ₃ with T ₄ .

In this case, when all of the temperature sensors T _{1 to} T ₄ fail, the warming operation can be performed using the incoming water temperature sensor and the outgoing water temperature sensor in the hot water supply heat source device. For example, when the temperature of hot water circulating with heat is detected by an incoming water temperature sensor or an outgoing water temperature sensor, and when all the incoming water temperature sensors in the hot water supply heat source device that is driven to keep warm detect a hot water temperature of 61 ° C or higher, When the tapping temperature sensor detects 67 ° C. or higher, it can be determined that the water is boiling. Even when all temperature sensors of T ₁ through T ₆ has failed can be performed insulation operation without stopping the system operation in response similarly.

FIG. 16 shows an alternative to the temperature sensor when the hot water circulation pump is started in the operation of keeping the hot water in the hot water storage tank 4 warm. The insulation operation of this embodiment, had been driving the hot water supply heat source circuit of the total number (start) when a temperature detected by the temperature sensor T ₄ is turned 56 ° C. or less (step 101 in FIG. 8), the temperature replaced by a temperature sensor T ₃ when the sensor T ₄ has failed, and controls the hot water supply heat source device drive of the total number with a temperature sensor T ₁ when the further temperature sensor T ₃ also fails. To explain this behavior in the flowchart of FIG. 16, first, it is determined whether the temperature sensor T ₄ has failed in step 401. Presence of a failure of the temperature sensor T ₃ is determined next at step 402 when the failure of the temperature sensor T ₄ is detected. When it is determined that the temperature sensor T ₃ has not failed, the temperature sensor T ₃
Substitution of the temperature sensor T ₄ used.

[0051] That is, to detect determines whether or not the detected temperature of the temperature sensor T ₃ becomes 58 ° C. or less at step 403, the water level of the hot water temperature of the temperature sensor T ₄ when the detected temperature became 58 ° C. or less It is estimated that the temperature has dropped to 56 ° C or less, and all the hot water supply heat sources are fully driven to perform the heat retention operation. Determining the presence or absence of a failure of the temperature sensor T ₁ at step 405 when the temperature sensor T ₃ is determined fault condition in the step 402.

When it is determined that the temperature sensor T ₁ is not in a failure state, all the hot water supply heat sources are once started in step 406, and the detected temperature of the temperature sensor T ₁ is monitored in step 407. Judge whether it is 60 ℃ or more. Continuing the insulation operation continues to drive the total number of hot-water supply heat source unit when the temperature detected by the temperature sensor T ₁ is not reached 60 ° C.. When the temperature detected by the temperature sensor T ₁ is detected to be at 60 ° C. or higher, confirms that the 60 ° C. or more state continues more than 10 seconds, to stop driving of all of the hot water supply heat source unit in step 408. Since the temperature sensor T ₃ has failed, because any water to which water level in the hot water storage tank 4 is coming from the water supply pipe is not known, and after 10 minutes from the stop of the circulation pump of the total number At this time, all the hot water supply heat sources are driven again, and steps 406 to 409
The above operation is repeated, and the warming operation of the hot water in the hot water storage tank 4 is performed.

The temperature sensor used for performing the hot water supply heat source starting operation can take various other forms. In the basic operation of this embodiment, two drive the hot water supply heat source circuit at a temperature detected by the temperature sensor T ₃ is 58 ° C. or less (start)
4 units are driven at 50 ° C or lower, and all units are driven at 40 ° C or lower.
Temperature detected by the temperature sensor T ₄ is also at 56 ° C. or less to drive the hot water supply heat source circuit of the total number.

In these operations, if the temperature sensor T ₄ is out of order, the temperature sensor T ₃ is substituted, and the number of hot water supply heat sources to be driven according to the temperature detected by the temperature sensor T ₃ can be selected. as an example, the temperature detected by the temperature sensor T ₃ are all number driven at 58 ° C. or less.

As another example, when the temperature sensor T ₃ is out of order, the temperature sensor T ₄ is used, and the detected temperature is 56 ° C.
In the following, all the hot water supply heat sources are driven.

When both the temperature sensors T ₃ and T ₄ are out of order, the temperature sensor T ₁ is used. For example, all the hot water supply heat sources are started at regular time intervals, and the temperature detected by the temperature sensor T ₁ is detected. Stops when the temperature rises above 60 ° C, and repeats the cycle of starting and stopping.

If all of the temperature sensors T ₁ , T ₃ , T ₄ are out of order, the temperature sensor T ₂ can be used to perform a heat retaining operation. In this case, for example, drives the hot water supply heat source unit of the total volume at predetermined time intervals, and stop all number when the detected temperature of the temperature sensor T ₂ is equal to or higher than 67 ° C., repeated cycles of start and stop .

When all of the temperature sensors T ₁ , T ₂ , T ₃ , and T ₄ are out of order, the operation can be performed using the temperature sensor in the hot water supply heat source. At this time, all the hot water supply heat sources are started at regular time intervals, etc., and when the detected temperature of all the incoming water temperature sensors in the hot water supply heat source becomes 60 ° C or higher, or
When all the detected temperatures of the hot water temperature sensor become 67 ° C. or more, it is determined that the hot water in the hot water storage tank has reached 60 ° C., and the hot water supply heat source device is stopped. This behavior, T ₁ even if all the temperature sensors of a failure of the through T _6, without stopping the system operation, it is possible to perform heat keeping operation by using a temperature sensor in the hot water supply heat source circuit.

FIG. 17 shows an operation example of the additional activation control unit 27. The operation of the additional activation control unit 27 is performed, for example, in the low load hot water supply state. No. 1 and No. When the hot water supply load shifts to the high load state in the state where the warming operation is being performed by the two hot water supply heat source devices No. 2 and No. 2, No. 3 to No. The six hot water supply heat sources of No. 8 are driven to fully drive all the hot water supply heat source devices. At this time, when the six hot water supply heat source devices that have been stopped so far are simultaneously driven, during the stop state, In the meantime, there is a risk that a large amount of cold hot water in the pipeline from each hot water supply heat source device to the hot water storage tank 4 may enter the hot water storage tank 4, and when a large amount of low-temperature hot water enters the hot water storage tank 4,
There is a problem that the temperature of the hot water flowing into the hot water supply circulation line from the hot water storage tank 4 becomes low, and hot water lower than the set temperature is supplied to each dwelling unit. In order to avoid this, the additional activation control unit 27 does not drive six heat sources at once when driving six heat source devices. 3 and No. 4 for driving a hot water supply heat source, and for a predetermined time after this driving, for example,
The next No. is shifted by 20 seconds. 5 and No. The two hot water supply heat sources of No. 6 were driven, and the time was further shifted by 20 seconds. 7 and No.
8 for driving two hot water supply heat sources.

In this way, by starting each of the hot water supply heat sources to be additionally driven one by one or several at a time interval, a large amount of low-temperature hot water does not enter the hot water storage tank 4 at once. Thereby, the temperature of the hot water sent from the hot water storage tank 4 to the hot water supply circulation pipe does not drop significantly, and hot water with a stable hot water temperature can be supplied to each dwelling unit.

Next, an example of the operation of the function stopping operation section 28 of the present embodiment will be briefly described. When the hot water is first accumulated in the hot water storage tank 4 and circulated through the hot water supply circulation pipe for the first time, the function stop operation unit 28 supplies the hot water of the set temperature from the hot water storage tank 4 to the hot water supply circulation pipe. Although the hot water circulation line is cold at first, the hot water storage tank 4
Back becomes considerably low temperature until, Therefore, when the hot water supply system to a normal automatic operation state, in the operation of step 202 or step 204 of FIG. 10, or the temperature sensor T ₆ detects a 45 ° C. or less, a temperature sensor T ₅ 50
If the temperature is lower than ℃, an abnormal alarm is output and the system operation is stopped.

In order to solve this problem, the function stop operation unit 28 stops the automatic operation function until the hot water in the hot water supply circulation reaches the set temperature of 60 ° C., performs the system operation first, and then starts the temperature sensor. T ₅ and T ₆ are both 60 ° C. set temperature
When the above is detected, the automatic operation of the system is started. By providing the function stopping operation section 28, the hot water supply system can be operated smoothly.

The present invention is not limited to the above embodiment, but can take various embodiments. For example, in the embodiment, two hot water supply circulation pumps 5 are provided.
It may be a stand.

In the above-described embodiment, alternative examples of the use of the faulty temperature sensor are shown in the flowcharts of FIGS. 15 and 16, but this faulty temperature sensor may take various other forms as shown in Table 1. What you get. In the table, crosses indicate that the temperature sensor is out of order, and circles indicate that the temperature sensor is normal. Further, the boiling control means an operation of stopping and controlling the hot water circulation pump when a designated temperature sensor detects the boiling temperature of the hot water in the hot water storage tank. This means an operation of activating the hot water circulation pump and controlling the activation of the hot water supply heat source when a decrease in the temperature of the internal hot water is detected.

[0065]

[Table 1]

[0066]

According to the present invention, the hot water supply load is changed from a low load to a high load.
Switch to (transfer) and all the hot water heaters
When operating, all the hot water heaters in the stopped state are operated simultaneously.
Avoid moving them, shift the time by one or more units
The hot water supply heat source in the stopped state
Cold water enters the hot water storage tank all at once from the pipeline side
The temperature of the hot water in the hot water storage tank from dropping
When the hot water supply load shifts from low to high
Low temperature hot water is supplied from the hot water storage tank to the hot water supply destination.
It is possible to prevent the problem of breeding .

[0067]

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a system configuration showing an embodiment of a large capacity hot water supply system to which a method of the present invention is applied.

FIG. 2 is a structural explanatory diagram of the system device of the embodiment.

FIG. 3 is an external perspective view of a hot water supply heat source unit of the system device of the embodiment.

FIG. 4 is a block diagram illustrating a main configuration of a control unit that performs the method of the present invention.

FIG. 5 is an explanatory diagram of a heat retaining operation in the hot water storage tank in the embodiment.

FIG. 6 is an explanatory diagram of a heat retaining operation following the operation of FIG. 5;

FIG. 7 is an explanatory diagram of a heat retaining operation following the operation of FIG. 6;

FIG. 8 is a flowchart of a heat retaining operation of the present embodiment.

FIG. 9 is a flowchart showing a retry operation of the hot water circulation pump by the retry operation unit.

FIG. 10 is a flowchart of a hot water supply circulation operation of the present embodiment.

FIG. 11 is an explanatory diagram showing an operation example of rotation of the hot water supply heat source device.

FIG. It is explanatory drawing which shows the rotation operation example of another hot water supply heat source device when the hot water supply heat source device of No. 4 is out of order.

FIG. 13 is an explanatory diagram showing an example of a rotation operation of the hot water supply heat source device when returning from the low-load hot water supply state to the high-load hot water supply state and further into the low-load hot water supply state.

FIG. 14 is an explanatory diagram showing an example of a rotation operation when the hot water supply heat source is continuously driven for a predetermined time.

FIG. 15 is a flowchart illustrating an example of a substitute security control of a failure temperature sensor in the hot water circulation pump on-start control during the hot water keeping operation in the hot water storage tank.

FIG. 16 is a flowchart showing an example of a replacement security control of a faulty temperature sensor in the hot water circulation pump off control during the hot water keeping operation in the hot water storage tank.

FIG. 17 is an explanatory diagram showing an example of additional startup control of a hot water supply heat source device.

FIG. 18 is an explanatory diagram of a conventional large capacity hot water supply system.

[Explanation of symbols]

2a~2h hot water supply heat source unit 4 hot water storage tank 5 hot water circulation pump 10 hot water circulation pipe 12 hot water circulation line T ₁ through T ₆ hot water temperature sensor 23 system controller

Continued on the front page (72) Inventor Yoshihiko Tanaka 3-4 Fukamidai, Yamato City, Kanagawa Prefecture Inside Gaster Co., Ltd. (72) Inventor Kazumi Suyama 3-4 Fukamidai, Yamato City, Kanagawa Prefecture Gaster Co., Ltd. (72 ) Inventor Takehito Inoue 3-4 Fukamidai, Yamato City, Kanagawa Prefecture Inside Gaster Co., Ltd. (72) Inventor Takashi Kaneko 3-4 Fukamidai, Yamato City, Kanagawa Prefecture Inside Gaster Co., Ltd. 3-4 Fukamidai, Yamato-shi, Japan Inside Gaster Co., Ltd. (56) References JP-A-3-158626 (JP, A) JP-A-4-184016 (JP, A) (58) Fields surveyed (Int. Cl. ⁷ , DB name) F24H 1/18 F24H 1/18 302 F24D 17/00

Claims (2)

(57) [Claims] 1. A hot water supply heat source device comprising a plurality of hot water supply heat sources, hot water produced by these hot water supply heat source devices is stored in a hot water storage tank, and hot water in the hot water storage tank is circulated through the hot water supply heat source to circulate hot water to keep hot water in the hot water storage tank. performs, in the operation control method of a large capacity hot water supply system for hot water supply circulation path around the respective hot water away from the hot water storage tank by circulating hot water performs heat insulation of the pipe indoor bath, before
The hot water storage tank has a lower first temperature sensor,
A second temperature sensor is provided in each direction above the
Detects the temperature of hot water in the tank,
Hot water is drawn from the tank to the hot water supply
The temperature of the hot water supply is lower than the first temperature sensor.
The hot water created by the heat source is above the second temperature sensor.
To the hot water storage tank at one side and supply hot water from the hot water storage tank
The hot water is delivered more than the second temperature sensor of the hot water storage tank.
Performed from above and detected by the first or second temperature sensor
The detected temperature in the hot water storage tank
Below the temperature for high load judgment which is predetermined for the temperature sensor
In the case of, the hot water supply load is judged to be in a high load state, and
The heat source is driven to keep the hot water in the hot water storage tank warm.
The temperature detected by the temperature sensor is higher than the high load determination temperature.
And the detected temperature of the first temperature sensor is
When the load is low within the predetermined low load determination temperature range, a predetermined number of the hot water supply heat sources of all the units is operated to keep the hot water in the hot water storage tank warm, and the load is changed from the low load state to the high load state. When the number of hot water supply heat sources is moved from the low-load operation number to the high-load operation number of all the units, the stopped hot water supply heat source units are switched one by one or several times. An operation control method for a large-capacity hot water supply system, characterized in that the operation is started at a time shifted by each unit. 2. A hot water supply system comprising a plurality of hot water supply heat sources, the hot water produced by these hot water supply heat sources being accumulated in a hot water storage tank, and the hot water in the hot water storage tank being circulated through the hot water supply heat source to circulate hot water to keep the hot water in the hot water storage tank warm. In a large-capacity hot water supply system that circulates hot water from the hot water storage tank to the hot water circulation circuit that goes around each hot water supply destination and keeps the hot water in the pipeline ,
Is the first temperature sensor below it, and the
The temperature of hot water in the hot water storage tank is provided by providing two temperature sensors
Water is supplied to the hot water storage tank and
The hot water is drawn out to the hot water source side by the first hot water storage tank.
Performed below the temperature sensor and created with the hot water heater
Hot water is stored at a position above the second temperature sensor.
The hot water is supplied from the hot water storage tank to the hot water storage tank.
The structure is to be performed from above the second temperature sensor of the hot water tank.
And the first temperature sensor or the second temperature sensor
The detected temperature in the hot water storage tank is the first,
A predetermined high-load determination temperature for the second temperature sensor
If the temperature is less than or equal to
The hot water supply heat source is driven to keep the hot water in the hot water storage tank warm.
The detected temperature of the second temperature sensor is used for determining the high load.
A temperature higher than the temperature and a detection temperature of the first temperature sensor;
When the load is at a low load within the predetermined low load determination temperature range, a predetermined number of the hot water supply heat sources of all the units is operated to perform the heat retaining operation of the hot water in the hot water storage tank, and the load is set at the low load. A hot water temperature control unit that moves all the hot water supply heat source units when the state shifts to the high load, and a hot water supply heat source that is stopped when the low load operation number shifts to the high load all unit operation state. A large capacity hot water supply system, comprising: an additional activation control unit that activates the heaters one by one or several units at staggered times.