JP5982939B2 - Hot water system - Google Patents

Description

  The present invention relates to a hot water supply system in which a plurality of hot water heaters are arranged side by side in an immediate hot water circulation pipe or a hot water storage circulation pipe.

  In conventional hot water circulation hot water supply systems and hot water storage hot water supply systems installed in hotels and apartment houses, multiple hot water heaters connected in parallel are provided in the hot water circulation circuit or hot water storage circulation circuit. In order to improve the performance, the control device is provided with a test operation mode in which combustion inspections of a plurality of water heaters are sequentially executed. A technique for executing the same inspection in a connected hot water supply system is disclosed in, for example, Patent Document 1 below.

JP 2005-98638 A

  When executing this test operation mode, the main controller circulates hot water in the circulation pipe by the circulation pump, opens the solenoid valve on the outlet pipe of the water heater to be inspected, and opens the solenoid valve on the outlet pipe of the other water heater. close up. When the controller inside the water heater to be inspected detects the incoming of hot water exceeding the minimum working water amount (MOQ) from the water inlet pipe, the controller starts the combustion control of the combustion apparatus mainly constituted by the gas burner. If the combustion of the gas burner cannot be confirmed despite the combustion control by the controller, specifically, if the flame detection device such as a frame rod attached to the gas burner cannot detect the flame, the controller A signal is output to the main control device, and the main control device is configured to perform failure notification.

  On the other hand, when the flame is detected by the flame detection device continuously for a predetermined time (for example, 0.3 seconds) after the start of combustion control by the controller, the controller outputs a predetermined normal signal to the main control device. Is configured to execute a combustion inspection of the next water heater, and when the combustion inspection of all the water heaters is normally completed, the main control device notifies that there is no appliance operation abnormality and ends the test operation mode.

  In addition, in order to protect the heat exchanger and other equipment in the hot water heater when the incoming water temperature of the hot water heater is higher than the predetermined temperature (the incoming high cut temperature), and to prevent burns due to high temperature hot water, The controller of the hot water heater is provided with a high water cut function that does not perform combustion control of the combustion device.

  In the above-mentioned immediate hot water circulation type hot water storage system and hot water storage type hot water supply system, if the trial operation mode is executed in a relatively small-scale system or in a situation where the use has already started, the temperature of the hot water in the pipe or hot water storage tank is immediately In some cases, the controller may not start combustion control due to the incoming high cut function due to warming above the incoming high cut temperature.

  In such a case, since the combustion control is not started, the flame detection control by the flame detection device is not executed, the control of the test operation mode is stopped until the combustion control start condition is satisfied, and the operation of the appliance is not performed without proceeding to the next sequence. The announcement that was being confirmed remained, and the situation was not communicated to the test runner. In such a state, there is a problem that unless the trial operation is forcibly terminated by an operation of turning off the operation switch or the like, it is necessary to continuously wait until the temperature of the hot water in the pipe or the hot water storage tank is lowered.

  Therefore, the present invention is able to promptly end the test operation mode in a short time by notifying the operator when the combustion control is not started by the incoming water high cut function so as to prompt the operator to lower the incoming water temperature. The purpose is to be able to.

  In order to achieve the above object, the present invention takes the following technical means.

That is, the present invention comprises an immediate hot water circulation circuit or hot water storage circulation circuit having a plurality of water heaters connected in parallel, and a control means for controlling the operation of the plurality of water heaters, the control means comprising a plurality of The water heater is configured to be switchable between a normal operation mode for controlling normal operation of the water heater and a test operation mode for sequentially performing test operation control of each water heater for combustion inspection during combustion control in each water heater. In the hot water supply system having an incoming water high cut function that does not perform combustion control of the hot water heater when the incoming water temperature is equal to or higher than a predetermined temperature, the control means is configured such that the hot water heater in trial operation control for combustion inspection is controlled by the incoming water high cut. It is characterized by comprising notifying means for making a predetermined notification by determining that it is not performed based on predetermined information supplied from the water heater. , 2 and 3).

  According to the present invention, when the trial run operator starts the trial run mode of the control means, the trial run control of each water heater for performing the combustion inspection is sequentially performed by the control means, and the combustion control in each water heater is performed. The combustion test inside is performed sequentially. At this time, if the combustion control is started in the water heater to be inspected, it is inspected whether the actual combustion is normally performed by the combustion inspection, and the result information can be output to the control unit. On the other hand, if the incoming water temperature from the circulation circuit to the water heater to be inspected is equal to or higher than the predetermined temperature, the control means performs trial operation control of the water heater in order to perform the combustion inspection of the water heater. Thus, the combustion control in the water heater is not started, and therefore the combustion inspection during the combustion control is not performed. However, in the present invention, during the execution of the test operation mode, it is determined based on the information supplied from the water heater that the water heater in the test operation control for the combustion inspection is not subjected to the combustion control by the incoming water high cut. In order to lower the incoming water temperature of the water heater, since the notification means is provided to perform the predetermined notification, the notification of the notification enables the test run person to notice that the combustion inspection sequence has stopped due to the incoming water high cut. The hot water in the circulation circuit can be discharged by an appropriate method such as opening the tip at the site, or other work can be performed until the hot water temperature in the circulation circuit is lowered.

  The information supplied from the water heater to the control means includes, for example, whether or not the amount of incoming water exceeds the minimum working water amount (MOQ) (MOQ ON state), and actual combustion in the water heater. (Specifically, for example, whether or not the flame rod that detects the flame of the gas burner detects the flame (FR OFF state)), and the MOQ is in the ON state but the FR OFF state. If it continues for a predetermined time (for example, 120 seconds), there is a high possibility that combustion is not possible due to the incoming water high cut, so the water heater in the trial operation control for combustion inspection is not controlled by the incoming water high cut. Can be determined and notified to the test runner by the notification means.

In the present invention, the notification means performs combustion control by the incoming water high cut when the state where the predetermined information supplied from the water heater under test operation control satisfies the predetermined condition continues for a predetermined incoming water high cut determination time. (Claims 1 and 4 ). According to this, by setting the incoming high cut determination time to be longer than the time required for various error determinations, it is possible to give priority to various error determinations and reliably generate various errors due to equipment failures, etc. It is possible to avoid notifying that the incoming water is in a high cut state despite the occurrence of a failure.

  In addition, the water heater side is provided with a configuration that outputs information indicating that it is in the incoming water high cut state to the control unit, and based on such information, the notification means determines that combustion control is not performed by the incoming water high cut. It is also possible to do. According to this, since the occurrence of the incoming high cut state can be directly determined, such determination can be performed in a short time (for example, 10 seconds), and more rapid work progress can be performed.

Furthermore, the water heater includes a combustion device and a water heater controller that executes combustion control of the combustion device based on an operation command signal from the control means, and the water heater controller has a temperature of incoming water to the water heater. When the combustion control of the combustion apparatus of the hot water heater is prohibited when the temperature is equal to or higher than the predetermined temperature, and the actual normal combustion of the combustion apparatus cannot be confirmed even after executing the predetermined misfire determination sequence after starting the combustion control A predetermined non-ignition error signal is output to the control means as combustion inspection result information, the incoming water high cut determination time is set longer than the time required to execute the non-ignition determination sequence, The control means is configured to end the trial operation control for the combustion inspection of the water heater when the non-ignition error signal is input from the water heater during the combustion inspection. Doo can (claim 5). According to this, it is possible to reliably detect a non-ignition error when the combustion apparatus cannot be ignited due to a failure of various appliances in the water heater, but to combust by the incoming high cut at the time of trial operation control even if no non-ignition error occurs. It is possible to detect that the inspection sequence is stopped and notify the trial run operator. The water heater controller can also output a normal ignition signal as combustion inspection result information to the control means when the combustion apparatus can confirm the actual normal combustion after starting the combustion control. When the signal is input, the trial operation control of the water heater is immediately terminated and the trial operation control of the next water heater is started, so that the execution time of the entire trial operation mode can be shortened.

In the hot water supply system, it is preferable that the predetermined notification by the notification means is a notification of a message that prompts an operation of lowering the incoming water temperature of the water heater (Claim 2 ). According to this, it is possible to announce the improvement method to the test runner more clearly, and even the inexperienced test run practitioner can reliably complete the test run. Note that the message for prompting the operation of lowering the water temperature of the water heater may be a natural language display display or voice guidance, or a predetermined signal display described in the operation manual, for example, a predetermined lamp. It may be flashing times.

The control means includes combustion performance storage means for storing combustion performance data indicating whether combustion was normally performed during combustion control in each water heater during the normal operation mode, and combustion performance data when switching to the test operation mode. based on the stored combustion actual data in the storage means obtaining the confirmation of whether to continue execution of the test operation mode can be provided with a selecting operation device (claim 3). According to this, when reliable combustion inspection is not required, the normal operation can be simply confirmed using the combustion performance data during normal operation without performing the test operation mode by selecting not to continue the test operation mode. When it is desired to perform a reliable combustion inspection, the selective operation means selects and continues the execution of the test operation mode, whereby the reliable combustion inspection in the test operation mode can be sequentially performed. Preferably, it is requested to confirm whether or not the test operation mode is executed only when the combustion performance data of all the water heaters indicates normality, and when there is even one water heater whose combustion performance data indicates abnormality The operation mode can be switched to the test operation mode without asking for confirmation of whether or not to execute the operation mode.

  As described above, according to the hot water supply system according to claim 1 of the present invention, during the trial operation mode, the hot water heater in the trial operation control for the combustion inspection is not controlled by the incoming water high cut. Since there is a notification means for making a predetermined notification by making a determination based on the information supplied from the water heater, the test run person has stopped the combustion inspection sequence due to the incoming high cut due to the notification. The hot water in the circulation circuit can be discharged by an appropriate method such as opening the tap at the site to lower the incoming water temperature of the water heater, or left until the hot water temperature in the circulation circuit drops. Then you can do other work.

  In addition, according to the hot water supply system according to claim 2 of the present invention, by setting the incoming water high cut determination time to be longer than the time required for various error determinations, priority is given to various error determinations, equipment failures, etc. It is possible to reliably generate various errors due to the above, and it is possible to avoid notifying that the incoming water is in a high cut state despite a failure.

  Moreover, according to the hot water supply system according to claim 3 of the present invention, the non-ignition error does not occur while reliably detecting the non-ignition error when the combustion apparatus cannot be ignited due to failure of various appliances in the water heater. Nevertheless, it is possible to detect that the combustion inspection sequence stops due to the incoming water high cut during the trial operation control, and notify the trial operator.

  Further, according to the hot water supply system according to claim 4 of the present invention, it is possible to announce the improvement method more clearly to the test runner, and even if the test run practitioner is unfamiliar, the test run can be reliably completed. it can.

  Further, according to the hot water supply system according to claim 5 of the present invention, when a reliable combustion inspection is not required, by performing a selection operation not to continue the test operation mode, the combustion in the normal operation without performing the test operation mode is performed. Normal confirmation can be easily performed using actual data, and when you want to perform reliable combustion inspection, select the continuous operation of the trial operation mode with the selection operation means, so that reliable combustion inspection in the trial operation mode is performed sequentially. Can be executed.

1 is a circuit configuration diagram of an immediate hot water circulation hot water supply system according to a first embodiment of the present invention. It is a control flowchart of the trial operation mode of the hot water supply system. It is a figure which shows the combustion performance confirmation screen of all the water heaters of the same hot-water supply system. It is a figure which shows the selection operation screen at the time of the trial run mode start of the hot-water supply system. It is a transition figure of the announcement display screen in the trial run mode of the hot-water supply system. It is a circuit block diagram of the hot water storage type hot-water supply system which concerns on 2nd Embodiment of this invention.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described with reference to the drawings.

  FIG. 1 shows an overall configuration of an immediate hot water circulation type hot water supply system according to a first embodiment of the present invention, and the hot water supply system includes an immediate hot water circulation circuit having three hot water heaters 1 connected in parallel. , And a control means for controlling the operation of the plurality of water heaters. The control means includes a system controller 2 and a remote controller 3. The system controller 2 is disposed in the housing of any one of the water heaters 1, and the remote controller 3 is installed on a wall surface near the water heater 1, but the system controller 2 is connected to the water heater 1. The system controller 2 may be provided with the functions of the operation unit and the display unit of the remote control without providing the remote control 3.

  In the immediate hot water circulation circuit, a circulation pump 4 for circulating hot water in the circuit and a plurality of hot water taps 5 are provided at appropriate positions. In the illustrated example, a water inlet of each hot water heater 1 is connected to the downstream side of the discharge port of the circulation pump 4, and a plurality of hot water taps 5 are provided on the downstream side of the hot water outlet of the water heater 1. A water inlet of the circulation pump 4 is connected to the side to constitute a circulation circuit. Further, a water supply pipe 6 connected to the water supply is connected between the circulation pump 4 and the water heater 1 to the circulation circuit, and from the water supply pipe 6 as hot water in the circuit is discharged from the hot water tap 5. Water is introduced into the circulation circuit.

  The hot water circulation circuit further includes safety valves 7 and 8, a closed expansion tank 9, a strainer 10, a gas separator 11, automatic air vent plugs 12 and 13, and main plugs provided on the inlet and outlet pipes of each water heater 1. Various devices such as 14 are provided, but the detailed structures of these circulation circuits are well known in the art and are not directly related to the gist of the present invention.

  In addition, a pump control unit 15 that controls the operation of the circulating pump 4 in accordance with a command signal from the system controller 2 is provided.

  Each water heater 1 has the same configuration as that of a conventionally known one, and includes a combustion device 16 mainly composed of a gas burner, a heat exchanger (not shown), and a water amount sensor for detecting the amount of incoming water from a water inlet (see FIG. Not shown), incoming water temperature sensor (not shown) for detecting incoming water temperature, hot water temperature sensor (not shown) for detecting hot water temperature from the hot water outlet, can body for detecting hot water temperature at the outlet of the heat exchanger A temperature sensor (not shown), a gas proportional valve (not shown) for adjusting the amount of gas supplied from the gas supply pipe 17 to the combustion device 16, and an upstream side of the gas proportional valve in the gas supply pipe 17 are provided. An original gas solenoid valve (not shown) that opens and closes the gas flow path, a capacity switching gas solenoid valve (not shown) that is provided downstream of the gas proportional valve in the gas supply pipe 17 and switches the number of gas burners that burn. Ignition operation to the gas burner A igniter (not shown), a fan (not shown) for supplying air to the combustion device 16 for mixing with gas, a hot water flow rate adjusting valve (not shown) for adjusting the hot water flow rate from the hot water outlet, A water heater controller 18 for controlling the combustion of the combustion device 16 by controlling the operation of valves and fans, a flame detection device 19 (frame rod) for detecting whether the combustion in the combustion device 16 is being performed, etc. The conventionally well-known apparatus is provided.

  The water heater controller 18 functions as a low-order control device that performs combustion control of the combustion device 16 in the water heater 1 in accordance with an operation command signal from the system controller 2 that is a host controller. Specifically, the water heater controller 18 supplies hot water from the system controller 2. An operation command signal indicating whether or not to perform the operation and the hot water supply set temperature is output to the water heater controller 18, and when the water heater controller 18 is instructed to perform the hot water supply operation, the supplied hot water set temperature is supplied. Combustion control of the combustion device 16 is performed by performing feedback control while referring to detection values of various sensors so that the temperature of the hot water corresponding to the data is reached. At this time, in order to protect the can, etc., whether or not the amount of incoming water detected by the water amount sensor is equal to or higher than the minimum operating water amount (MOQ) corresponding to the capacity of the water heater, and the incoming water temperature sensor detects it. It is always determined whether the incoming water temperature is lower than a predetermined incoming high cut temperature. If the incoming water amount is lower than the minimum working water amount, or if the incoming water temperature is equal to or higher than the incoming high cut temperature, the combustion of the combustion device 16 is performed. Control is not performed.

  Further, the water heater controller 18 constantly or predeterminedly receives information on whether or not the amount of incoming water is greater than or equal to the minimum working water amount and information on whether or not the actual combustion detected by the flame detection device 19 is being performed. It is configured to output to the system controller 2 at timing.

  In addition, when the combustion control is started, the water heater controller 18 executes a predetermined misfire determination sequence and outputs the result to the system controller 2 as combustion inspection result information. The sequence is executed at the start of combustion control. For example, if the flame detection device 19 detects a flame continuously for 0.3 seconds after ignition of the gas burner, a normal ignition signal is output to the system controller 2 as combustion inspection result information. On the other hand, if the flame cannot be detected immediately after the ignition operation of the gas burner, the ignition operation of the gas burner is repeated once again by closing the original gas solenoid valve in order to avoid gas leakage, and this ignition confirmation is repeated a predetermined number of times (for example, 9 When the normal combustion of the combustion device 16 cannot be confirmed even if repeated, a predetermined misfire error signal is output to the system controller 2 as combustion inspection result information. The time required for such a non-ignition determination sequence is substantially constant according to the specific appliance configuration of each water heater and the control content of the non-ignition determination sequence itself. For example, it takes about 75 seconds to determine the non-ignition error signal. It is. Since this non-ignition determination sequence is executed only when the water heater controller 18 starts combustion control, the non-ignition determination sequence is not executed when the incoming water high cut state or the minimum operating water amount is not reached. Inspection result information is not output to the system controller 2.

  The system controller 2 can switch between a normal operation mode in which normal operation control is performed on a plurality of water heaters 1 and a test operation mode in which trial operation control of each water heater is sequentially performed for combustion inspection during combustion control in each water heater 1. It is configured. Specifically, any one of the above modes can be selected and executed by operating the remote controller 3, and when each mode is executed, each water heater controller 18 according to a control sequence provided in advance for each mode. An operation command signal is output to. In any mode, the system controller 2 outputs a command signal to the pump control unit 15 to operate the circulation pump 4 to circulate hot water in the circulation circuit.

  The control content in the normal operation mode may be the same as that in the prior art, or may be new control content that did not exist in the past. That is, the present invention only refers to the normal operation mode in order to clarify that the control content in the trial operation mode is characteristic, and does not limit the control content in the normal operation mode to a specific one. Absent.

  However, preferably, during execution of the normal operation mode, combustion result data indicating whether combustion has been normally performed during combustion control in each water heater 1 is stored in a built-in memory (combustion result storage means). Is good. For example, a state in which information indicating whether or not combustion is actually being performed supplied from the water heater controller 18 of each water heater 1 to the system controller 2 indicates that the combustion is in progress (FR ON) for 0.3 seconds. When detected, data indicating normality (OK) is stored as the combustion performance data of the water heater 1. On the other hand, when information indicating a failure is supplied from the water heater controller 18, data indicating abnormality (NG) is stored as combustion performance data of the water heater, and the abnormality is detected until the normal state is detected. continue. However, when the system controller 2 is reset, the combustion performance data of all the water heaters 1 is set to data indicating that it has not been executed, and initial communication with the system controller 2 is performed when the water heater controller 18 of each water heater 1 is reset. Therefore, the system controller 2 can recognize that the water heater 1 has been reset, and therefore the combustion performance data of the water heater 1 is set to data indicating that the water heater 1 has not been executed. In addition, in order to make it possible to easily check the current combustion performance data, a predetermined operation of the remote controller 3 displays a combustion performance confirmation screen as shown in FIG. It is also possible to check the combustion performance at a time.

  FIG. 2 shows a control flow of the test operation mode in the system controller 2 of the present embodiment. In the present embodiment, when the remote control 3 performs the switching operation to the trial operation mode and the execution of the trial operation mode is started, first, whether or not the combustion performance data of all the water heaters 1 indicates normal (OK). (Step S1), if the combustion performance data of all the water heaters 1 is not normal, the process proceeds to the initial setting of the test operation mode (step S4). If the combustion performance data of all the water heaters 1 is normal, the test operation mode is set. A selection operation screen (see FIG. 4) for confirming whether or not to continue the execution of the operation is output to the display screen of the remote controller 3, and the remote controller 3 selects and inputs whether or not to continue the test run mode. It is configured to be able to. In addition, after displaying the announcement screen indicating that the combustion results of all the water heaters are normal shown in the upper side of FIG. 4, the selection operation screen shown in the lower side of FIG. 4 is displayed after a few seconds. . Thus, the test operation based on the combustion performance data stored in the combustion performance storage means at the time of switching to the test operation mode is performed by the remote controller 3 that performs display control of the selection operation screen and input control of whether or not to continue execution of the test operation mode. A selection operation means for requesting confirmation of whether or not to continue execution of the mode is configured. If it is input by the remote control 3 that the test operation mode is continued by the conditional branching in step S3, the process proceeds to the initial setting of the test operation mode (step S4). finish.

  In the initial setting of the trial operation mode (step S4), a pump control unit is used to set 1 as an initial value to a counter n for sequentially performing trial operation control of a plurality of water heaters 1, reset the timer, and operate the circulation pump 4. 15 outputs a command signal.

  Next, the operation command signal is output to the water heater controller 18 of the n-th water heater 1, and the stop command signal is output to the water heater controller 18 of the other water heaters, whereby the trial operation control of the water heater 1 is performed. At the same time as starting (Step S5), as shown in the display screens D1 and D2 in FIG.

  Then, as described above, if the combustion control prohibition condition has not occurred, the water heater controller 18 starts the combustion control of the combustion device 16 and executes the non-ignition determination sequence, thereby requiring the non-ignition determination sequence. Within a time period (for example, about 75 seconds), a normal combustion signal or a non-ignition error signal is output to the system controller 2 as combustion inspection result information, and when it is detected that the system controller 2 is input (step S6), It is determined whether or not the water heater 1 currently performing the trial operation control is the last appliance (step S7), and if not the last step, the counter n is incremented to perform the trial operation control of the next water heater 1. Return to S5. On the other hand, if it is determined in step S7 that it is the last instrument, the combustion inspection result is displayed on the display screen of the remote controller 3 as shown in the display screen D4 or D5 of FIG. D4 shows a display example when no non-ignition error occurs in all the water heaters 1, and D5 is a table when a non-ignition error ([11] error) occurs in the second water heater 1. An example is shown. In addition, it is also possible to configure such that errors occurring in various water heaters 1 other than non-ignition errors are output from the water heater 1 in step S6, and if any error signal is output from the water heater 1, the process proceeds to step S7. .

  On the other hand, during the trial operation control of each water heater 1, whether or not the MOQ is in the ON state supplied from the water heater controller 18 of the water heater 1 to be inspected to the system controller 2 together with the input determination of the combustion inspection result information (step S6). When the MOQ is OFF or the FR is detected to be ON, the timer is reset while the timer value is set to a predetermined incoming high cut determination time (for example, referring to the information on whether or not the FR is in an OFF state. It is determined whether or not the state of MOQ ON and FR OFF has continued for a predetermined time by determining whether or not 120 seconds has elapsed (step S6: NO, step S8). The incoming high cut determination time is set longer than the time required to execute the non-ignition determination sequence.

  When such a predetermined condition is satisfied, there is an extremely high suspicion that combustion control in the water heater 1 cannot be started due to the incoming water high cut. Therefore, as shown in the display screen D3 in FIG. 5, an operation for lowering the incoming water temperature is urged. A message to that effect is provided on the display screen of the remote controller 3 (step S9), and preferably an alarm sound is generated by a buzzer device built in the remote controller 3. Thus, it is confirmed from the water heater that the hot water heater during the trial operation control for the combustion inspection is not subjected to the combustion control by the incoming water high cut by the remote controller 3 that displays the display screen D3 and the system controller 2 that performs these controls. An informing means for making a predetermined informing by making a determination based on the supplied information is configured.

  When such notification is given, the test run operator drains the hot water in the circulation circuit by opening the hot-water tap 5 or the like, and introduces cold water into the circulation circuit from the water supply pipe 6, thereby By reducing the temperature of the hot water, it is possible to eliminate the incoming high cut state and perform the combustion inspection sequence by the water heater controller 18 correctly.

  According to the present embodiment, without changing the configuration of the conventional water heater, the incoming water high cut is performed in the system controller 2 based on the MOQ ON information and the FR OFF information that have been output from the water heater to the system controller 2 conventionally. Therefore, it is possible to make a test run operator to make a high-temperature water injection, and to avoid a situation where the combustion test sequence does not proceed and the test run does not end indefinitely. In addition, by recording the actual combustion during normal operation and making it possible to select whether or not to continue the test operation when all appliances have been confirmed to be burned, it is easy to perform a reliable combustion test in a short time. In this case, it is possible to use it properly when it is desired to end the confirmation work, and the maintainability is further improved.

  FIG. 6 shows a hot water storage hot water supply system according to a second embodiment of the present invention. The same components as those in the first embodiment are denoted by the same reference numerals, detailed description thereof is omitted, and different configurations and effects are provided. explain.

  In the present embodiment, a hot water storage circuit 21 is configured between a plurality of hot water heaters 1 connected in parallel and a hot water storage tank 20, and the hot water supply circuit 22 having the hot water tap 5 is in parallel with the hot water storage circuit 21. In general, it is connected to the hot water tank 20. The water supply pipe 6 is connected to the downstream side of the hot water tap 5 in the hot water supply circulation circuit 22. Further, the pump control unit 15 controls the circulation pump 4 when the detected temperature is lower than a predetermined temperature (for example, 60 to 80 ° C.) based on the detected temperature of the hot water temperature in the hot water tank 20 by the temperature sensor 23 provided in the hot water tank 20. The operation is controlled.

  In such a configuration, when the hot water temperature in the hot water storage tank 20 is equal to or higher than the predetermined temperature, the circulation pump 4 does not operate. Therefore, even if the execution of the test operation mode of the system controller 2 is started, In addition, the combustion control in the water heater controller 18 is not started. Therefore, in this embodiment, information indicating that the incoming water high cut state is obtained when the detected temperature by the incoming water temperature sensor is equal to or higher than the incoming water high cut temperature (for example, 50 ° C.). The function to output to 2 is added. The critical value of the hot water temperature in the hot water storage tank 20 that stops the circulation pump 4 is about 60 to 80 ° C., which is higher than the incoming high cut temperature of about 50 ° C. Hot water having a hot water temperature equal to or higher than the incoming water high cut temperature remains in the hot water circulation circuit, and therefore information indicating that the incoming water high cut state is present is output from the water heater controller 18 to the system controller 2.

  And in the trial run mode of the system controller 2 of this embodiment, in step S8 of the said 1st Embodiment, it does not judge based on the information of MOQ and FR, but is in the incoming high cut state supplied from the water heater controller 18. When information indicating that the information is present continuously continues for a predetermined time, for example, 10 seconds, the process proceeds to step S9 and an announcement is made to lower the incoming water temperature.

  According to the present embodiment, it is possible to determine in the system controller 2 that the incoming water high cut state is in a very short time by directly outputting the incoming water high cut state from the water heater controller 18 to the system controller 2. Thus, the trial operation can be completed in a shorter time.

  The present invention is not limited to the above-described embodiment, and the design can be changed as appropriate. For example, the function of the water heater controller can be integrally provided in the system controller, and the controller of each water heater can be made unnecessary. In the above embodiment, the incoming water flow rate detected by the incoming water flow rate sensor is compared with the minimum working water amount, but the heat detected by a can body water amount sensor (not shown) provided on the incoming side of the heat exchanger. It is also possible to compare and determine the incoming water flow rate to the exchanger with the minimum amount of working water.

DESCRIPTION OF SYMBOLS 1 Water heater 2 System controller as control means 3 Remote control functioning as notification means and selection operation means 16 Combustion device 18 Water heater controller 19 Frame rod (flame detection means)

Claims (5)

An immediate hot water circulation circuit or a hot water storage circulation circuit having a plurality of water heaters connected in parallel, and a control means for controlling the operation of the plurality of water heaters, the control means controlling normal operation of the plurality of water heaters A normal operation mode for switching to a trial operation mode for sequentially performing trial operation control of each water heater for combustion inspection during combustion control in each water heater. In the hot water supply system having an incoming water high cut function that does not perform combustion control of the water heater,
The control means is configured to perform a predetermined notification by determining, based on predetermined information supplied from the hot water heater, that the hot water heater under trial operation control for combustion inspection is not subjected to combustion control due to the incoming water high cut. Means ,
The notification means determines that combustion control is not performed by the incoming water high cut when a state in which the predetermined information supplied from the water heater under test operation control satisfies a predetermined condition continues for a predetermined incoming water high cut determination time. Hot water supply system characterized by An immediate hot water circulation circuit or a hot water storage circulation circuit having a plurality of water heaters connected in parallel, and a control means for controlling the operation of the plurality of water heaters, the control means controlling normal operation of the plurality of water heaters A normal operation mode for switching to a trial operation mode for sequentially performing trial operation control of each water heater for combustion inspection during combustion control in each water heater. In the hot water supply system having an incoming water high cut function that does not perform combustion control of the water heater,
The control means is configured to perform a predetermined notification by determining, based on predetermined information supplied from the hot water heater, that the hot water heater under trial operation control for combustion inspection is not subjected to combustion control due to the incoming water high cut. Means,
The hot water supply system according to claim 1, wherein the predetermined notification by the notification means is a notification of a message prompting an operation to lower the incoming water temperature of the water heater.
An immediate hot water circulation circuit or a hot water storage circulation circuit having a plurality of water heaters connected in parallel, and a control means for controlling the operation of the plurality of water heaters, the control means controlling normal operation of the plurality of water heaters A normal operation mode for switching to a trial operation mode for sequentially performing trial operation control of each water heater for combustion inspection during combustion control in each water heater. In the hot water supply system having an incoming water high cut function that does not perform combustion control of the water heater,
The control means is configured to perform a predetermined notification by determining, based on predetermined information supplied from the hot water heater, that the hot water heater under trial operation control for combustion inspection is not subjected to combustion control due to the incoming water high cut. Means,
The control means includes combustion performance storage means for storing combustion performance data indicating whether combustion has been normally performed during combustion control in each water heater during the normal operation mode, and combustion performance storage means when switching to the test operation mode. A hot water supply system comprising: a selection operation means for determining whether or not to continue execution of the trial operation mode based on the combustion performance data stored in 4. The hot water supply system according to claim 2 , wherein the notifying unit receives water when a state in which the predetermined information supplied from the water heater under test operation control satisfies a predetermined condition continues for a predetermined water input high cut determination time or longer. A hot water supply system that determines that combustion control is not performed by high cut . 5. The hot water supply system according to claim 1, wherein the water heater includes a combustion device and a water heater controller that performs combustion control of the combustion device based on an operation command signal from the control means. The controller prohibits the execution of the combustion control of the combustion device of the water heater when the temperature of the incoming water to the water heater is equal to or higher than the predetermined temperature, and also performs the combustion even if the predetermined misfire determination sequence is executed after the combustion control is started. When actual normal combustion of the apparatus cannot be confirmed, a predetermined misfire error signal is output to the control means as combustion inspection result information, and the incoming water high cut determination time is required for execution of the non-ignition determination sequence Is set longer than the time, and when the control means inputs the non-ignition error signal from the water heater during the combustion inspection, the control means performs the combustion inspection of the water heater. Hot water supply system characterized in that it is configured to terminate the trial operation control.

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