JPH0783506A - Operation controlling method for large capacity hot water supplying system - Google Patents

Abstract

PURPOSE:To provide a method for controlling an operation of a large capacity hot water supplying system in which hot water supply heat source equipments are effectively utilized by making the operating time of the equipments uniform. CONSTITUTION:When a hot water supplying load is high, hot water obtained by operating all hot water supply heat source equipments 2a-2d is supplied to a hot water storage tank 4, and hot water in the tank 4 is heat reserved. When the load becomes low, two equipments 2a, 2b of all the equipments are, for example, driven, and after it is continuously driven for a predetermined time, the equipments 2a, 2b are stopped, the equipments 2c, 2d are instead driven, and then the hot water in the tank 4 is heat reserved. The equipments are sequentially circularly driven, thereby making the operating time of the respectively equipments uniform.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an operation control method for a large capacity hot water supply system having a hot water storage tank.

[0002]

2. Description of the Related Art When a large amount of hot water is temporarily used for an apartment house such as a condominium, a single dormitory with a large public bath, a public bath, a large-scale house, a restaurant, etc. A large capacity hot water supply system is provided.

FIG. 18 shows a general large capacity hot water supply system of this type. This high-capacity hot water supply system includes a heat source unit 3 including a plurality of hot water source heat sources (water heaters) 2a to 2d in a case 1, and a hot water storage tank 4 for storing hot water produced by the heat source unit 3. Each hot water supply heat source device 2a of the heat source device unit 3 is configured to have a pump unit 6 with a built-in hot water supply circulation pump 5 that circulates hot water in the hot water storage tank 4 to each home such as an apartment.
~ 2d and hot water storage tank 4 between the hot water supply heat source device 2a ~ 2d
The hot water circulation pipe is provided by using the return pipe 8 that draws hot water from the hot water storage tank 4 by driving the forward pipe 7 and hot water circulation pump 40 that supply the hot water produced in step 4 to the hot water storage tank 4. Road 10 is provided. Further, between the hot water storage tank 4 and the pump unit 6, the suction side pipe line 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 connected 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 rotates and returns to the hot water storage tank 4.

A valve 13 and a check valve 15 are provided in the return pipe 8 of each of the hot water supply heat source devices 2a to 2d, and a valve 16 is provided in the forward pipe 7 of each of the hot water supply heat source devices 2a to 2d. There is.
These valves 13 and 16 are normally kept open and are closed during repair and inspection.

Each hot water supply heat source device is constructed in the same manner as an ordinary hot water supply device, and internally has a flow sensor for detecting the amount of water flow, a heat exchanger for heating the water (hot water) of the water flow, and this heat exchanger. A burner for combustion heating, a proportional valve for controlling the amount of gas supplied to this burner, a water temperature sensor for detecting the temperature of the incoming water, a hot water temperature sensor for detecting the hot water temperature, and a combustion fan for supplying and exhausting the burner combustion. The burner has a point ignition means, a heat source control device for controlling hot water combustion, and the like, and a remote controller (not shown) is connected to the heat source control device.

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

In this kind of large capacity hot water supply system,
The hot water storage tank 4 is filled with hot water at the set temperature 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 the hot water supply heat source devices 2a to 2d through the return pipe 8 and the combustion control of these hot water supply heat source devices 2a to 2d is performed, so that the water passing through the built-in heat exchanger is burned by the burner combustion power. By producing hot water at the set temperature and supplying the produced hot water to the hot water storage tank 4 through the forward pipe 7, the hot water storage tank 4 is filled with the hot water at the set temperature,
Hot water can be supplied to each home.

When hot water is used in each home (dwelling unit), the amount of hot water in the hot water storage tank 4 decreases, so that water is supplied from the water supply pipe 21 into the hot water storage tank 4 to compensate for it. The water that has entered is collected on the bottom side of the hot water storage tank 4. When the use of hot water in each household continues, the water level in the hot water storage tank 4 rises, and when the water level exceeds the first temperature switch 17, the first temperature switch 17 lowers the hot water temperature. It senses and outputs a switch signal. In response to this switch signal, the system controller 20 drives, for example, two hot water supply heat sources 2a and 2b among the four hot water supply heat sources 2a to 2d, and the water supply pipe 21
Water (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.

When a large amount of hot water is used in each home, the cold water level level rises further. When the water level exceeds the second temperature switch 18, the second temperature switch 18 senses a decrease in the hot water temperature and outputs a switch signal. As a result, the system controller 20 causes the second temperature switch 18 to operate. Upon receiving the signal, the four hot water supply heat source devices 2a to 2d are fully operated to supply the water.
The water supplied from 21 (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 and supplied to the hot water storage tank 4 to keep the hot water in the hot water storage tank 4.

When the use of hot water at each home is stopped, the level of the low temperature water level in the hot water storage tank 4 is lowered by the heat retention operation of the hot water supply heat source devices 2a to 2d, and the first temperature switch 17 and the second temperature switch. When both 18 no longer sense the decrease in hot water temperature, it is determined that the hot water temperature in the hot water storage tank 4 has reached the set temperature, and the warming operation of the hot water supply heat sources 2a to 2d is stopped. On the other hand, when the hot water supply circulation pump 5 is driven, the hot water in the hot water storage tank 4 circulates through the hot water supply circulation conduit 12, and the hot water in the hot water supply circulation conduit 12 is significantly 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, but the first temperature When the switch signal is output from the switch 17, the two hot water supply heat source devices are driven. At this time, conventionally, a predetermined specific hot water supply heat source device, for example, the hot water supply heat source devices 2a and 2b are operated, so that the operating time of the hot water supply heat source devices 2a and 2b is the other two.
It takes much longer than the hot water heaters 2c and 3d on the stand,
The hot water supply heat sources 2a to 2d cannot be evenly used in balance, and the hot water supply heat sources 2a and 2b are different from the other hot water supply heat sources 2c and 2d.
There was a problem that the life is shortened in a shorter period.

The present invention has been made in order to solve the above-mentioned conventional problems, and its purpose is to balance the operating time of a plurality of hot water supply heat source devices installed and to make a specific hot water supply heat source device other than the other hot water supply heat source devices. An object of the present invention is to provide an operation control method for a large-capacity hot water supply system that does not significantly shorten the life of the hot water supply heat source device.

[0013]

In order to achieve the above object, the present invention is constructed as follows. That is, the present invention is provided with a plurality of hot water supply heat source devices, accumulates the hot water produced by these hot water supply heat source devices in the hot water storage tank, and circulates the hot water in the hot water storage tank through the hot water supply heat source device to circulate the hot water in the hot water storage tank. In the operation control method of the large-capacity hot water supply system that keeps the temperature of the hot water in the pipeline by circulating the hot water from the hot water storage tank to the pipeline that goes around each hot water supply destination, the hot water load is higher than the preset reference load. When all of the hot water supply heat sources are operating, the hot water supply load is smaller than the reference load, and when the load is low, a predetermined number of all the hot water supply units are operated to keep the hot water in the hot water storage tank warm. In operation, every time the hot water supply load gradually shifts to a low level, and every time the hot water supply load returns from a low load to a high load and becomes a low load again, the operating state of a predetermined number of hot water supply heat source units out of the total number of units is kept for a predetermined time. Continue It is configured as characterized in that rotates the hot water supply heat source circuit that operates when falling under any one or more of each that.

[0014]

According to the present invention, when the hot water supply load is equal to or higher than the preset reference load, all the hot water supply heat source devices are operated to keep the hot water in the hot water storage tank warm, and the hot water supply load is lower than the reference load. Occasionally, a predetermined number of hot water supply heat sources among all the number of hot water supply heat sources are driven to perform a heat retention operation.However, at the time of this low load heat retention operation, every time the hot water supply load gradually shifts to a low level or the hot water supply load is increased. A predetermined number of hot water supply heat sources are returned from a low load state in which a predetermined number of hot water supply heat source devices are operating, to a high load state in which all the hot water supply heat source devices are driven, and then a low load state is restored again or a predetermined number of hot water supply heat source devices are in a low load state. When the hot water supply heat source device is operating and the operation time corresponds to any one or more every time it continues for a predetermined time, the operation time of each hot water supply heat source device is made uniform by rotating the hot water supply heat source device to be operated. To be

[0015]

Embodiments of the present invention will be described below with reference to the drawings. In the invention of this embodiment, the same parts as those of the conventional example are designated by the same reference numerals, and the duplicated description thereof will be omitted. 1 to 3 show the configuration of a large capacity hot water supply system in this embodiment.

This embodiment is different from the conventional example in that a plurality of all hot water supply heat source devices 2a to 2h and two hot water supply circulation pumps 5 are united in an equipment case 22. , Check valve and valve 13 of each hot water supply heat source 2a-2h
A hot water circulation pump 14 is provided in the return pipe 8 between 15 and the temperature sensors T ₃ and T composed of a thermistor or the like instead of the first temperature switch 17 and the second temperature switch 18 in the hot water storage tank 4. ₄ , temperature sensors T ₁ and T ₂ such as thermistors are further provided in the hot water circulation pipeline 10, and temperature sensors T ₅ and T ₆ such as thermistors are similarly provided in the hot water supply circulation pipeline.
Is to have to perform a system control with these temperature sensors T ₁ through T _6, the others are the same as those of the prior art.

As shown in FIG. 4, the system controller 23 of the present embodiment receives the signals from the corresponding temperature sensors T _{1 to} T ₆ and controls the hot water temperature of the hot water in the hot water storage tank 4 24.
A hot water supply circulation control unit 19 that circulates hot water in the hot water storage tank 4 to a hot water supply destination, a rotation control unit 25 that controls rotation of the hot water supply heat sources 2a to 2h, and temperature control of hot water in the hot water storage tank 4 are performed. When a failure occurs in the temperature sensor used for this purpose, a substitute guarantee control unit 26 that substitutes another temperature sensor, and an additional activation control unit 27 that controls the timing of additional activation when increasing the number of operating hot water supply heat source devices When the system power is turned on, the function stop operation unit 28 that stops the original control operation of the hot water in the hot water storage tank 4 and when the pumps 5 and 14 do not start normally, or the point ignition operation of the hot water supply heat source device becomes normal. When it is not performed, it is configured to have a retry operation unit 29 that repeatedly performs a re-operation and also makes a failure determination. The operation of each of these units will be described below.

5 to 7 schematically show the warming operation of the hot water temperature control section 24. FIG. 5 (a) shows a state in which the hot water storage tank 4 is filled with hot water at a set temperature (60 ° C. in this example).
The hot water in the hot water storage tank 4 is circulated through the hot water supply circulation line 12 by the driving. In this state, as shown in (b) of the same figure, if a small load condition occurs in which a small amount of hot water is used in some dwelling units (households), the hot water used from the water supply pipe 11 is removed. Water to be replenished 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 Is maintained.

As shown in (c) of the figure, when the hot water is continuously used, the level of the low temperature hot water in which the water in the hot water storage tank 4 and the hot water in the hot water storage tank 4 are mixed The water level level of the temperature sensor T ₃ is exceeded, and the hot water temperature control unit 24 drives one hot water supply heat source device 2a in response to the temperature detection signal of the temperature sensor T ₃ , and from the water supply pipe 21 to the return pipe 8
The water supplied through the tank is heated to a set temperature, and the hot water having 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 The decrease in the hot water temperature is detected by the hot water temperature control unit 24, and in response to this temperature detection signal, the hot water temperature control unit 24 fully operates all the hot water supply heat source devices 2a, 2b, 2c to supply 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 tanks 4a, 2b, 2c and heated, and a large amount of hot water having a preset temperature created by all hot water supply heat source devices 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 reached, all hot water supply heat source devices are still fully operating. 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, and hot water of the set temperature is fed into the hot water storage tank 4. By operating all the hot water supply heat source devices, the water level lower than the set temperature in the hot water storage tank 4 gradually decreases, and as shown in (c) of the figure, the hot water supply heat source devices 2a to 2c have water supply pipes.
The low-temperature hot water obtained by mixing the water from 21 and the hot water drawn from the hot water storage tank 4 is guided to the hot water supply heat source devices 2a to 2c, and the same heat retaining operation is performed.

As shown in FIG. 7 (a), when the use of hot water is stopped and there is no load, low-temperature hot water is guided from the lower side of the hot water storage tank 4 to the hot water supply heat sources 2a to 2c. As a result of being heated and returned to 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, as shown in (b) of the figure, when the heat retention operation continues, the temperature of the hot water drawn from the lower portion 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. In addition, the hot water temperature control unit 24 determines that the hot water in the hot water storage tank 4 is filled with the hot water of the set temperature, and the hot water supply heat source devices 2a to
The driving of 2c is stopped, and the heat retention state shown in FIG.

FIG. 8 is a flowchart showing the heat retaining operation of the hot water circulation together with the operation of the retry operation unit 29. Explaining this flowchart, first, in the heat retention operation of the hot water in the hot water storage tank 4, first, step 10
1, the temperature sensor T ₄ installed in the hot water storage tank ₄
It is judged whether the detected temperature of is less than 56 ℃ corresponding to the reference load. When the temperature detected by the temperature sensor T ₄ is 56 ° C. or lower with respect to the set temperature of 60 ° C., it is determined that the high-load hot water supply is being performed, and in step 102, all the hot water supply heat source devices are fully driven to perform the heat retention operation. 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, B8.
There are 8 hot water supply heat sources in the type, 6 in the B6 type, 4 in the B4 type, and 3 in the B3 type. In all types, the hot water circulation pumps 14 of all hot water supply heat sources are activated. Full drive.

In step 103, it is judged whether or not the flow sensor in each pump-driven hot water supply heat source device is turned on. When the flow sensor is turned on, each hot water supply heat source device is ignited, and in step 105, it is confirmed whether or not an error signal is output from each hot water supply heat source device. When no error signal is output, it is determined that each hot water supply heat source device is operating normally, and in step 106, the temperature of the hot water drawn from the hot water storage tank 4 to the hot water supply heat source device is detected by the temperature sensor T ₁ .
Determine whether the detected temperature is 58 ℃ or higher. When the detected temperature of hot water is lower than 58 ° C, all the hot water supply heat sources are fully driven to keep the temperature warm. When the temperature detected by the temperature sensor T ₁ becomes 58 ° C. or higher, it is determined that the low-load hot water supply state is reached, and in step 107, the two hot water supply heat source devices are continuously driven and the remaining hot water supply heat source devices are stopped.

Then, in step 108, the temperature detected by the temperature sensor T ₁ is continuously monitored, and it is determined whether or not the detected temperature is 60 ° C. or higher. Until the detected temperature reaches 60 ° C, the two hot water supply heat source devices are driven to continue the heat retention operation.
When the temperature detected by the temperature sensor T ₁ becomes 60 ° C. or higher, it is determined that the hot water in the hot water storage tank 4 is filled with the hot water having the set temperature of 60 ° C., and the two hot water source heat sources that have been driven are stopped. To do.
Then, when the error flag was previously set in the operation of the hot water supply heat source device, the flag is erased, and the apparatus stands by for the next hot water supply.

In step 103, when the ON signal is not output from the flow sensor in the hot water supply heat source device, air remains in the hot water circulation pump 14 or the like, and the hot water circulation pump 14
Assuming that the drive of No. 1 is not normally performed, the retry operation unit 29 repeats the starting operation of the hot water circulation pump 14 at intervals of 1 minute. If the ON signal is not output from the flow sensor even after the starting operation of the hot water circulation pump 5 is performed five times, it is determined that the hot water circulation pump 14 is in a failure state,
An error is displayed on the display unit (not shown) of the system controller.

Further, when an error signal is output from the hot water supply heat source device in step 105, air has accumulated in the gas pipe of the fuel gas supplied to the hot water supply heat source device, 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 1-minute intervals. When hot-water supply and combustion are normally performed by repeating this ignition operation, the operations from step 106 are performed, and when ignition is not normally performed even after repeating four ignition operations, it is determined that the hot-water supply heat source device has a failure state, and The failure report is sent to the central control room of the hot water heater or the after-sales service station by telephone or wireless. After making a call, the after-sales service station uses a telephone line, etc. to remotely check the operating status and take appropriate measures or dispatch service personnel.

When the temperature detected by the temperature sensor T ₄ exceeds 56 ° C. in step 101, the temperature detected by the temperature sensor T ₃ is monitored in step 113. When the temperature detected by the temperature sensor T ₃ is higher than 40 ° C and lower than 50 ° C, it is determined that the medium load hot water is supplied, and in each of the types B4, B6 and B8, the hot water circulation pumps of the four hot water supply heat source devices are activated. To keep warm. In step 115, it is determined whether or not the flow sensor in the hot water supply heat source that started the hot water circulation pump 14 is turned on, and 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 device is detected. The pump is stopped and the hot water circulation pump of the hot water supply heat source device is activated to drive a predetermined number of hot water supply heat source devices. Then, an error flag is set to the hot water supply heat source device for which the flow sensor is not turned on.

At step 116, the hot water supply heat source device whose flow sensor is turned on is ignited, and at step 117 it is confirmed whether or not an error signal is output. When an error signal is output, it is determined that the ignition was not performed normally, and after stopping the hot water circulation pump of the hot water supply heat source device that generated this error signal and setting an error flag, other The circulating hot water pump of the alternative hot water supply heat source device is started to perform the ignition operation, and after confirming that no error signal is output, the operation from step 118 to step 122 is performed. This step
The operations of 118 to 122 are the same as the operations of steps 106 to 110.

When the temperature detected by the temperature sensor T ₃ is in the temperature range of 50 ° C. to 58 ° C. in step 113, it is judged that the load is low, and two hot water source heat sources are driven to maintain the temperature. To do. That is, after activating the hot water circulation pumps of the two designated hot water supply heat sources, the ON signal of the flow sensor in the hot water supply heat sources is checked to perform the ignition operation, and the ON signal is not output from the flow sensor. For the heat source device, the operation is stopped, an error flag is set, and the hot water supply heat source device is operated to drive the two hot water supply heat source devices. Then, in step 129, the temperature of the hot water drawn from the hot water storage tank 4 to the hot water supply heat source device is detected by the temperature sensor T ₁ , and the heat retaining operation is continued until the detected temperature reaches 60 ° C. When the detected temperature reaches 60 ° C. First, it is determined that the hot water in the hot water storage tank 4 is filled with the hot water having the set temperature of 60 ° C., and the heat retaining operation of the hot water supply heat source device is stopped.

As described above, in this embodiment, the temperature sensors T ₃ and T ₄ are provided in the hot water storage tank 4 in place of the temperature switches 17 and 18 of the conventional example, so that the temperature detected by the temperature sensors T ₃ and T ₄ is detected. Depending on the temperature difference between the temperature sensors T ₃ and T ₄ or 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 unit 29. The operation of this flowchart will be described. First, when an error occurs in the hot water circulating pump of the hot water supply heat source device driven in step S1, the hot water circulating pump in which the error has occurred is stopped and an error flag is set in step S2. This 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 if 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 the hot water supply heat source in the 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 last hot water circulation pump started.

When the time exceeds 20 seconds, the retry operation is performed. This is to prevent a large amount of low-temperature hot water accumulated in the outgoing pipes 7 of all the hot water supply heat source devices whose hot water circulation pumps are activated from being sent into the hot water storage tank 4 at the same time. 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 hot water circulation pump start command in which the error occurred was issued. Then, when 60 seconds or more has elapsed, the hot water circulation pump in the error occurrence state is started in step S6. It is assumed that the error of the hot water circulation pump occurs due to the accumulation of air or the like in the pump, and by driving the hot water circulation pumps other than the one that generated the error in step S3, the hot water of the error occurrence is generated. In order to wait for the time when the air in the circulation pump is released and for the removal of dust and the like, after 60 seconds of this waiting time, the hot water circulation pump in which the error has occurred is started in step S6. Then, in step S7, it is determined whether or not the ON signal is output from the flow sensor in the hot water supply heat source device in which the error has occurred. When the ON signal is output from the flow sensor, the ignition operation of the hot water supply heat source device is performed in step S9. 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 normal mode is entered.

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 hot water circulation pump is restarted every predetermined time, for example, 20 seconds. Repeatedly, each time, it is confirmed whether 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 circulation pump has been restarted five times, the hot water circulation pump determines that the error is not caused by the stay of air but is caused by the failure. The error is displayed on the error display section of the system control device 23 or the like, and the error notification (failure notification) of the hot water circulation pump is given to the central control room or the after-sales service station by automatic telephone.

Next, the hot water supply circulation operation of the hot water supply 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 this pump, the hot water in the hot water storage tank 4 circulates through the hot water supply circulation line 12.

After the first hot water supply circulation pump 5 is started, the temperature of the hot water returned to the hot water storage tank 4 is detected by the temperature sensor T _{6 in} step 202. Whether the detected temperature is 45 ° C or lower is determined. When the detected temperature is 45 ° C or lower, an error is displayed on the monitor display unit (not shown) of the system controller 23 and the system controller 23 automatically Telephone calls will be made to the central control room or the after-sales service station. When the temperature detected by the temperature sensor T ₆ is higher than 45 ° C., in step 203, the overcurrent prevention device for the hot water supply circulation pump (
(Not shown) has actuated.

When driving the hot water supply circulation pump, the control range of the normal drive current is given by the upper limit value and the lower limit value, and when the pump drive current flows beyond this range, the overcurrent prevention device operates. When this device is operating, an abnormality is displayed on the monitor display and a telephone call is made to inform the central control room and the like of the abnormality. If the overcurrent protection device is not operating,
At 204, the temperature detected by the temperature sensor T ₅ is monitored, and it is determined whether the detected temperature is 50 ° C. or lower. When the detected temperature is 50 ° C. or lower, it is judged to be abnormal because it is too low compared to the heat retention temperature of 60 ° C. Similarly, an abnormal display is displayed on the monitor display unit and an abnormal report is output by telephone. And
When this abnormal alarm output is reported, 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 the locked state, and the second hot water supply circulation pump is driven to perform the hot water supply circulation operation. To perform. 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.

When the temperature detected by the temperature sensor T ₅ is higher than 50 ° C. in step 204, it is then determined in step 205 whether the detected temperature is 75 ° C. or higher. The detected temperature is
When the temperature is 75 ° C or higher, it is abnormally high compared to the hot water retention temperature of 60 ° C, so it is judged that an abnormality has occurred in the system operation.
An abnormality is displayed on the display section of the monitor, an abnormality alarm is output by telephone, and all of the hot water circulation pump and the hot water circulation pump are in the stop lock state.

When the temperature detected by the temperature sensor T ₅ is lower than 75 ° C. in step 205, the hot water supply circulation by the first hot water supply circulation pump is continued, and 29 minutes 30 minutes after the pump is started in step 201 by a timer or the like. Determine if seconds have passed. After 29 minutes and 30 seconds,
The air is stopped for only one second, and the air that may enter the hot water supply circulation conduit 12 is discharged. After the stop period of 30 seconds has passed, 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 pump drive is 29
Every 30 minutes, stop for 30 seconds and bleed air from the pipeline. When the drive time of the first hot water supply circulation pump has passed 24 hours from the start of activation in step 201, the first hot water supply circulation pump is stopped and put to rest, and the second hot water supply circulation pump is controlled to start and the hot water storage tank 4 Perform hot water supply circulation of hot water. The first hot water supply circulation pump and the second hot water supply circulation pump alternately operate every 24 hours to make the operating time of the first and second hot water supply circulation pumps uniform.

11 to 14 show an example of the rotation operation of the hot water supply heat source device by the rotation control unit 25. FIG. 11 shows a state of rotation when the hot water supply load changes from a high load state to a low load state via a medium load state. No. 1 hot water heater 1 to No. In a hot water supply system in which 8 units up to 8 are installed, No. 1 to No. All eight hot water supply heat source devices up to 8 are driven to perform the heat retention operation. During this operation, No.
No. 1 hot water supply heat source is the first priority drive, The second hot water supply heat source device is the second of the priority drive, and the hot water supply heat source devices up to the eighth are driven.

When the hot water supply load shifts from the high load state to the medium load state, the four hot water supply heat source devices are driven. The hot-water supply heat source device No. 3 is the first of the priority drives, and the No. 4 to No. Up to 6 hot water supply heat sources are driven. When the hot water supply load shifts to the low load state, No. The hot water supply heat source device of No. 5 is the first in the priority driving order, and the following No. No. 6 hot water supply heat source device is the second 5
And No. Two hot water supply heat source devices 6 are driven. In this way, every time the hot water supply load shifts from a high load to a medium load to a low load state, the first priority drive is gradually shifted (in this example, two units are shifted by two). Uniform operation time of heat source.

FIG. 12 shows No. The rotation when the hot water supply heat source device of No. 4 is in a failure state is shown. When in the high-load hot water supply state, the failure status No. Except for the hot water supply heat source device No. 4, all the hot water supply heat source devices are driven to perform the heat retention operation. When the state changes to the medium load hot water supply state, No. No. 3 hot water supply heat source device is the first priority drive, No. 4 jumping over the hot water heater of No. 4 The hot water supply heat source device No. 5 is the second, and the Nos. 1 to 4 are Nos. 3, No. 5, No. 6, No. The four hot water supply heat source devices 7 are driven. When the hot water supply load shifts to the low load state, No. The hot water supply heat source device of No. 6 is the first of the priority driving, and the second No. of the priority driving. 2 for both hot water supply heat source
The table hot water source heat source device is driven to perform heat retention operation. When the hot water supply load shifts to the larger direction, the first priority drive is 2
No. No. 8 hot water supply heat source is the first priority drive, The hot water supply heat source device No. 1 is the second one of the priority drive, and the failure state No. The hot water supply heat source device of No. 4 is skipped, and the hot water supply heat source devices up to the sixth are driven to perform the heat retention operation.

FIG. 13 shows an example of rotation when the hot water supply load changes from a high load state to a medium load or a low load state, and then returns to a high load state and then shifts to a medium load or a low load. Is. No. when in high load hot water supply state The hot water supply heat source device No. 1 is the first of the priority drives, and the warming operation is performed by driving all eight hot water supply heat source devices. Next, when the hot water supply load shifts to the medium load state, No. Three
The hot water supply heat source of No. 1 is the first of the priority drives, and the fourth No. Four hot water supply heat source devices up to 6 are driven to perform the heat retention operation. Next, when the hot water supply load shifts to a high load state, all eight hot water supply heat source devices are driven again to perform the heat retention operation, and when the hot water load shifts to the medium load state again, No. The hot water supply heat source device of No. 5 is the first of the priority drives, and the fourth No. Up to 8 hot water supply heat source devices are driven to perform heat retention operation.

FIG. 14 shows that after a continuous operation state for a predetermined time, for example, 12 hours, in which the state of medium load or low load is preset, the rotation is forcibly performed and another hot water supply heat source device is operated in turn. It is a thing. In the example of FIG. 14, rotation in a low load state is shown, and the continuous operation for the first 12 hours is No. No. 1 hot water supply heat source device is the first of the priority drive,
No. 1 and No. The two hot water supply heat source devices of No. 2 are continuously operated.
Then, when 12 hours passed, this time No. No. 3 hot water supply heat source device is the first priority drive, 3 and No. The hot water supply heat source device of No. 4 is continuously operated for 12 hours. In this way, the operating time of the hot water supply heat source device can be made uniform by sequentially shifting the first hot water supply heat source device that is preferentially driven every 12 hours.

15 and 16 are flowcharts showing an example of the operation of the substitute guarantee control unit 26. In FIG. 15, when the hot water circulation pump is stopped after boiling water by the heat retention operation, if the temperature sensor T ₁ fails, the temperature sensor T ₂ substitutes, and if the temperature sensor T ₂ also fails, the temperature sensor T ₃ It was designed to be used instead. This operation will be described with reference to the flowchart of FIG.
At 301, it is confirmed that the ignition operation of the hot water supply heat source device is normally performed, and at step 302, it is determined whether or not the temperature sensor T ₁ has failed. From step 303 when there is no failure
The operation of 306 is performed, and the warming operation of the hot water in the hot water storage tank 4 is performed. When it is detected that the temperature sensor T ₁ has failed, it is determined in step 307 whether the temperature sensor T ₂ has failed. When the temperature sensor T ₂ has not failed, the temperature sensor T ₂ is used in place of the temperature sensor T ₁ to perform the heat retaining operation.

That is, in step 308, it is judged whether or not the temperature detected by the temperature sensor T ₂ is 67 ° C. or higher, and if the hot water returned from the hot water supply heat source to the hot water storage tank 4 is lower than 67 ° C., the warming operation is carried out. Subsequently, when the temperature detected by the temperature sensor T ₂ becomes 67 ° C. or higher, it is determined that the hot water in the hot water storage tank 4 is filled with the hot water of 60 ° C. which is the set temperature, and the heat retention operation is stopped. When it is determined in step 307 that the temperature sensor T ₂ has failed, it is determined in step 309 whether or not the temperature sensor T ₃ is in a failed state, and when the temperature sensor T ₃ is also failed, the heat retaining operation is stopped. Temperature sensor T
_{When 3} is determined to be not faulty performs insulation operation by using the temperature sensor T _3. That is, in step 310, it is judged whether or not the temperature detected by the temperature sensor T ₃ is 61 ° C. or higher, and when the temperature of the hot water is lower than 61 ° C., the heat retaining operation is continued and the temperature detected by the temperature sensor T ₃ becomes 61 ° C. or higher. When it becomes, it is judged that all the hot water in the hot water storage tank 4 is filled with the hot water of the set temperature of 60 ° C., the hot water supply heat source device is stopped, and the heat retention operation is ended.

In the above case, the temperature sensors T ₁ ,
When T ₂ and T ₃ are all faulty, the heat retaining operation is stopped in step 311, but the temperature sensor T ₄ can be used as a substitute without performing the heat retaining operation. In this case, the temperature sensor T ₃ may be replaced with T ₄ in the operation of step 309 to operate.

In this case, when all of the temperature sensors T _{1 to} T ₄ are out of order, the heat retaining operation can be performed using the incoming water temperature sensor and the outgoing hot water temperature sensor in the hot water supply heat source device. For example, when the temperature of hot water circulating in warm insulation is detected by an incoming water temperature sensor or an outgoing hot water temperature sensor, and when all incoming water temperature sensors in the hot water supply heat source device for keeping warm drive detect a hot water temperature of 61 ° C or higher, or When the tap water temperature sensor detects 67 ° C or higher, it can be determined that boiling has occurred. Even when all the temperature sensors of T _{1 to} T ₆ are out of order, the warming operation can be similarly performed without stopping the system operation.

FIG. 16 shows the replacement guarantee of the temperature sensor when the hot water circulation pump is started by the heat retaining operation of the hot water in the hot water storage tank 4. In the heat retention operation of this embodiment, all the hot water supply heat source devices are driven (started) when the temperature detected by the temperature sensor T ₄ becomes 56 ° C. or lower (step 101 in FIG. 8). When the sensor T ₄ fails, the temperature sensor T ₃ is substituted, and when the temperature sensor T ₃ also fails, the temperature sensor T ₁ is used to control the driving of all the hot water supply heat source devices. This operation will be described with reference to the flowchart of FIG. 16. First, in step 401, it is determined whether or not the temperature sensor T ₄ has failed. When a failure of the temperature sensor T ₄ is detected, next, at step 402, it is judged whether or not the temperature sensor T _{3 has} a failure. When it is determined that the temperature sensor T ₃ has not failed, the temperature sensor T ₃
To replace the temperature sensor T ₄ .

That is, in step 403, it is determined whether or not the temperature detected by the temperature sensor T ₃ is 58 ° C. or lower. When the detected temperature is 58 ° C. or lower, the water temperature at the water level of the temperature sensor T ₄ is reached. It is presumed that the temperature has dropped to 56 ° C or lower, and all the hot water supply heat source devices are fully driven to maintain heat. When it is determined in step 402 that the temperature sensor T ₃ is in a failure state, it is determined in step 405 whether the temperature sensor T ₁ is in failure.

When it is determined that the temperature sensor T ₁ is not in a failure state, all the hot water supply heat source devices are once activated in step 406, and the detected temperature of the temperature sensor T ₁ is monitored in step 407. Judge whether it is over 60 ℃. When the temperature detected by the temperature sensor T ₁ has not reached 60 ° C., all the hot water supply heat source devices are continuously driven to continue the heat retention operation. When it is detected that the temperature detected by the temperature sensor T ₁ is 60 ° C. or higher, it is confirmed that the temperature of 60 ° C. or higher has continued for 10 seconds or longer, and in step 408, driving of all hot water supply heat source devices is stopped. Since the temperature sensor T ₃ is out of order and it is not known to which water level in the hot water storage tank 4 the water is coming from the water supply pipe, 10 minutes have passed since the circulation pumps of all the units were stopped. At that time, all the hot water supply heat sources are driven again, and steps 406 to 409
The operations up to are repeated to keep the hot water in the hot water storage tank 4 warm.

As an alternative to the temperature sensor used for performing the hot water supply heat source starting operation, various other modes can be adopted. In the basic operation of this embodiment, when the temperature detected by the temperature sensor T ₃ is 58 ° C. or less, two hot water supply heat source devices are driven (started).
Then, 4 units are driven below 50 ° C, and all units are driven below 40 ° C.
When the temperature detected by the temperature sensor T ₄ is 56 ° C. or lower, all the hot water supply heat source devices are driven.

In these operations, when the temperature sensor T ₄ is out of order, the temperature sensor T _{3 can} be substituted, and the number of hot water supply heat source devices to be driven can be selected according to the temperature detected by the temperature sensor T _3. As an example, all the units are driven when the temperature detected by the temperature sensor T ₃ is 58 ° C. or lower.

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

When both of the temperature sensors T ₃ and T ₄ are out of order, the temperature sensor T ₁ is used. For example, the hot water supply heat sources of all the units are activated at a constant time interval to detect the temperature detected by the temperature sensor T ₁ . Stops when the temperature rises above 60 ° C, and this cycle of starting and stopping is repeated.

When all of the temperature sensors T ₁ , T ₃ and T ₄ are out of order, the temperature sensor T ₂ can be used to perform the heat retaining operation. Also at this time, for example, all the hot water supply heat source devices are driven at regular time intervals, and when the temperature detected by the temperature sensor T ₂ becomes 67 ° C. or higher, all the units are stopped, and this start-up and stop cycle is repeated. .

When all of the temperature sensors T ₁ , T ₂ , T ₃ , T ₄ are out of order, the operation can be performed by using the temperature sensor in the hot water supply heat source device. Also at this time, when all the hot water supply heat source devices are started at regular intervals, etc., and when the detected temperatures of all the incoming water temperature sensors in the hot water supply heat source devices are 60 ° C or higher, or
When all the temperatures detected by the hot water temperature sensor have risen to 67 ° C or higher, it is judged that the hot water in the hot water storage tank has reached 60 ° C, and the hot water supply heat source device is stopped. By this operation, even if all the temperature sensors of T _{1 to} T ₆ fail, the temperature keeping operation can be performed using the temperature sensors in the hot water supply heat source device without stopping the system operation.

FIG. 17 shows an operation example of the additional start control unit 27. The operation of the additional start control unit 27 is, for example, in No. 1 and No. When the hot water supply load shifts to a high load state while the warming operation is being performed by the two hot water supply heat source devices No. 2 and No. 2, 3 to No. 6 hot water supply heat source devices of 8 are driven fully to drive all the hot water supply heat source devices, but at this time, if 6 hot water supply heat source devices that have been stopped until now are driven at the same time, the There is a possibility that a large amount of cold hot water in the pipe line 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 entering the hot water supply circulation pipe 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, when the additional activation control unit 27 drives the six heat source devices, it does not drive the six heat source devices all at once. 3 and No. 2 two hot water supply heat source devices are driven, and after this driving for a predetermined time, for example,
The next No. after shifting the time by 20 seconds. 5 and No. Drive two hot water supply heat source units of No. 6 and shift the time for 20 seconds, and 7 and No.
8 drives two hot water supply heat source devices.

In this way, by activating the hot water supply heat source devices to be additionally driven one by one or several times at a time, it is possible to prevent a large amount of low-temperature hot water from entering the hot water storage tank 4 all at once. As a result, 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 stable hot water can be supplied to each dwelling unit.

Next, an operation example of the function stop operation unit 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 first through the hot water, the function stop operation unit 28 ensures that hot water at the installation temperature enters the hot water supply circulation pipe from the hot water storage tank 4. However, since the hot water supply circulation pipe is initially cold, the temperature is considerably low before returning to the hot water storage tank 4. Therefore, when the hot water supply system is brought into a normal automatic operation state, step 202 in FIG.
Or in the operation of step 204, the temperature sensor T ₆ becomes 45 ° C.
If the following is detected or the temperature sensor T ₅ detects 50 ° C. or lower, an abnormal alarm is output and the system operation stops.

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., and after first performing the system operation, the temperature sensor Both T ₅ and T ₆ are set temperature 60 ℃
When the above is detected, the automatic operation of the system is started. By providing the function stopping operation unit 28, the hot water supply system can be operated smoothly.

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

Further, in the above-mentioned embodiment, the alternative use example of the failure temperature sensor is shown in the flow charts of FIGS. 15 and 16, but the failure temperature sensor can be replaced by various other modes as shown in Table 1. I will get it. In the table, a cross indicates that the temperature sensor is out of order, and a circle indicates that the temperature sensor is normal. The boiling control means the operation of stopping the hot water circulation pump when the designated temperature sensor detects the boiling temperature of the hot water in the hot water storage tank, and the startup control means that the designated temperature sensor controls the hot water storage tank. This means the operation of activating the hot water circulation pump to control the activation of the hot water supply heat source device when a decrease in the temperature of the indoor hot water is detected.

[0065]

[Table 1]

[0066]

According to the present invention, since the hot water supply heat source device is configured to be rotated and driven, the operating time of each hot water supply heat source device can be made substantially uniform, so that the specified hot water supply heat source device is operated. Can solve the problem that it has a shorter life than other hot water supply heat source devices.

Furthermore, since the operating time can be made uniform, the operating rate of each hot water supply heat source device can be increased and effective utilization can be achieved.

[Brief description of drawings]

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

FIG. 2 is a structural explanatory diagram of a system device of the same 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 showing 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 according to the same embodiment.

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

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

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

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

[Fig. 12] No. FIG. 4 is an explanatory diagram showing an example of a rotation operation 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 the low load hot water supply state is returned to the high load hot water supply state again and the low load hot water supply state is further entered.

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

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

FIG. 16 is a flowchart showing an example of replacement guarantee control of a failure temperature sensor in hot water circulation pump OFF control during hot water keeping operation in a hot water storage tank.

FIG. 17 is an explanatory diagram showing an example of additional startup control of the 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

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshihiko Tanaka, 3-4 Fukamidai, Yamato City, Kanagawa Prefecture, Gaster Co., Ltd. (72) Kazumi Suyama, 3-4, Fukamidai, Yamato City, Kanagawa Prefecture, Gaster Co., Ltd. ( 72) Inventor Gojin Inoue, 3-4 Fukamidai, Yamato City, Kanagawa Prefecture, Gaster Co., Ltd. (72) Inventor Takashi Kaneko 3-4, Fukamidai, Yamato City, Kanagawa Prefecture (72) Inventor, Hiroaki Fujita Kanagawa Prefecture 3-4 Fukamidai, Yamato-shi Gaster Co., Ltd.

Claims (1)

[Claims] 1. A plurality of hot water supply heat source devices are provided, hot water produced by these hot water supply heat source devices is accumulated in a hot water storage tank, and hot water in the hot water storage tank is circulated through the hot water supply heat source device to keep hot water in the hot water storage tank. In the operation control method of the large capacity hot water supply system in which hot water is circulated from the hot water storage tank to the pipes that go around each hot water supply destination to keep the hot water in the pipes warm, the hot water supply load is higher than the preset reference load. Sometimes all hot water supply heat sources are operated, and when the hot water supply load is lower than the reference load, a predetermined number of all the hot water supply devices are operated to keep the hot water in the hot water storage tank warm, and this low load operation is performed. In doing so, every time the hot water supply load gradually shifts to the lower level,
Each time the hot water supply load returns from a low load to a high load and becomes a low load again, the hot water supply heat source device of a predetermined number of all the units is activated when it continues for a predetermined time. A method for controlling operation of a large capacity hot water supply system, characterized in that a hot water supply heat source device is rotated.