JP2010276293A - Controller for hot water heating device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a controller for a hot water heating apparatus capable of stably supplying a hot water temperature to a radiator. <P>SOLUTION: The operation of a burner 2 is controlled on the basis of temperature data of a hot water temperature sensor 9 equipped on a sidewall of a can body 1 to maintain hot water of the can body 1 at a set temperature TS. The radiator 6 is connected to the can body 1 via an outgoing pipe 7a and a return pipe 7b, and hot water is circulated between the can body 1 and the radiator 6 by a circulating pump 8. A temperature sensor 11 equipped in the return pipe 7b detects a temperature of hot water to be returned from the radiator 6 to the can body 1. When the detected temperature of the temperature sensor 11 is a predetermined temperature T1 or lower, a timer means 12 is operated, and when a predetermined time t1 is counted by the timer means 12, the circulating pump 8 is stopped to change a combustion stop temperature TSb. When the temperature sensor 9 detects the combustion stop temperature TSb before changing, the operation of the circulating pump 8 is restarted, and the combustion of the burner 2 is continued until a combustion stop temperature TSh after the change is detected. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a control device for a water heater equipped with a hot water circulation circuit.

  Inside the can of the water heater is equipped with a burner as a heat source and a heat exchanger to which the combustion gas generated in the burner is sent. The heat exchanger is connected to the combustion chamber wall and the combustion chamber. The combustion gas passage is used as a heat exchange section. The combustion flame and combustion gas generated when the burner burns are sent to the combustion chamber, and the high-temperature combustion gas is discharged through the combustion gas flow path. At this time, the water stored in the heat exchanger is heated.

  A radiator is connected to the can body via an outgoing pipe and a return pipe, and a circulation pump is attached to the outgoing pipe, and when the circulation pump is operated, hot water discharged from the can body is sent from the outgoing pipe to the radiator, Water that has radiated heat by the radiator and lowered in temperature returns from the return pipe to the can body, and is heated again in the can body to form warm water that is sent to the radiator. At this time, the hot water temperature in the can is monitored by the hot water temperature sensor. When the hot water temperature in the can drops and the hot water temperature sensor detects the combustion start temperature, combustion of the burner starts and the hot water temperature in the can rises. When the hot water temperature sensor detects the combustion stop temperature, combustion of the burner is stopped and the hot water in the can is maintained at the set temperature (see Patent Document 1).

Japanese Patent Laid-Open No. 61-213422

  Hot water storage type water heaters take time from the start of operation until the water temperature of the can body is boiled up to the set temperature, so if there is an operation request from the radiator at the same time as the start of operation, low temperature hot water or water will enter the radiator. When the hot water temperature in the can is low and the water is boiled while circulating the hot water in the radiator, the time for the hot water temperature to rise increases. There are hot air heaters and hot water panels as radiators connected to the water heater. When the radiator is a hot air heater, the low temperature wind continues to blow until the hot water temperature in the can rises. There is a problem in that it is uncomfortable, the room is not warmed for a long time, the user's heating request cannot be met, and the usability is poor.

  In addition, when connecting a hot water panel to a water heater and using it as an outdoor snow melting device, the set temperature of the can body is set lower than when using it with a hot air heater, so heat exchangers and combustion The temperature of the exhaust gas in the gas flow path is likely to decrease. And when there is a lot of snowfall or when the temperature is extremely low, a load exceeding the capacity of the water heater may be applied. In this case, the hot water temperature of the can cannot be raised and the temperature of the hot water remains lowered. As the operation continues, the exhaust gas temperature in the heat exchanger and combustion gas flow path also decreases, causing moisture contained in the exhaust gas to condense, and this dew condensation water corrodes the heat exchanger and combustion gas flow path. It was the cause of.

  In addition, the hot water heater can branch a circulation pipe connected to the water heater and connect multiple radiators, but when operating multiple radiators simultaneously, the hot water returned to the can body There is a problem that the temperature tends to vary, the temperature change of the can increases, and the burner frequently repeats burning and stopping, which increases the generation of noise and odor.

  The present invention solves the above-described problem. A burner 2 serving as a heat source in a can body 1 of a water heater, a combustion chamber 3 to which combustion gas generated in the burner 2 is sent, and a combustion chamber 3 wall or a combustion chamber 3 And a heat exchanger 5 having the wall of the combustion gas flow path 4 as a heat exchanging portion to connect the can body 1 and the radiator 6 via the forward pipe 7a and the return pipe 7b, and the forward pipe 7a. A circulation pump 8 is attached to the hot water circulation circuit A to control the operation of the burner 2 based on the hot water temperature sensor 9 attached to the side wall of the can 1 and the detection data of the hot water temperature sensor 9. And a control means 10 which outputs a combustion start signal to the burner 2 when the hot water temperature sensor 9 detects the combustion start temperature TSa, and burns to the burner 2 when the hot water temperature sensor 9 detects the combustion stop temperature TSb. A stop signal is output and the hot water temperature in the can 1 is set to the set temperature T. In the hot water heating apparatus in which the circulating pump 8 is driven to circulate hot water between the can body 1 and the radiator 6, the heat pump is attached to the return pipe 7 b and is moved from the radiator 6 to the can body 1. A temperature sensor 11 for detecting the temperature of the circulating water to be returned and a timer means 12 that operates based on the temperature detected by the temperature sensor 11 are provided. The control means 10 has a temperature detected by the temperature sensor 11 equal to or lower than a predetermined temperature T1. When the timer means 12 counts for a predetermined time t1, the circulating pump 8 is stopped and the combustion stop temperature TSb of the burner 2 is changed to a high value. 9 restarts the operation of the circulation pump 8 when detecting the combustion stop temperature TSb before the change, and the hot water temperature sensor 9 detects the combustion stop temperature TSh after the change. Characterized by continuing the burning of over Na 2.

  Further, when the temperature detected by the hot water temperature sensor 9 is higher than the combustion start temperature TSa and the circulating pump 8 is driven while the burner 2 is stopped, the temperature detected by the temperature sensor 11 is not more than the predetermined temperature T1. The timer means 12 is not operated, and hot water in the vicinity of the set temperature TS can be sent to the radiator 6 even if the temperature sensor 11 detects a predetermined temperature T1 or less.

  Further, when the temperature detected by the hot water temperature sensor 9 is higher than the combustion start temperature TSa and the circulating pump 8 is driven while the burner 2 is stopped, the temperature detected by the temperature sensor 11 is equal to or lower than the predetermined temperature T1. When the timer means 12 is actuated and the timer means 12 counts a predetermined time t1 before the hot water temperature sensor 9 detects the combustion start temperature TSa or less, the burner is operated while the circulation pump 8 is driven. By starting the combustion of 2, the set temperature TS can be maintained without greatly reducing the hot water temperature in the can body 1.

  The control means 10 is provided with a circulation start temperature TC of the circulation pump 8 set higher than the combustion start temperature TSa of the burner 2 and lower than the combustion stop temperature TSb. When the detected temperature of the temperature sensor 9 is equal to or lower than the combustion start temperature TSa, the combustion of the burner 2 is started while the circulation pump 8 is stopped, and the hot water temperature sensor 9 detects the circulation start temperature TC. By driving the circulation pump 8, the hot water in the can 1 can be boiled up to the vicinity of the set temperature TS in a short time and then sent to the radiator 6.

  In addition, second timer means 13 that operates based on the temperature detected by the hot water temperature sensor 9 is provided, and the control means 10 has the second timer means when the temperature detected by the hot water temperature sensor 9 is equal to or higher than the combustion stop temperature TSb. 13 and the combustion of the burner 2 is continued while the second timer means 13 is in operation, and the combustion of the burner 2 is stopped when the second timer means 13 has counted t2 for a predetermined time. Even if the hot water temperature of the body 1 changes temporarily, the burner 2 continues to burn, so that the burner 2 does not frequently repeat combustion and stop.

Further, the second timer means 13 includes a counter means 14, and when the second timer means 13 stops before counting for a predetermined time t2, the counter means 14 counts and adds,
By changing the combustion stop temperature TSb higher when the counter means 14 reaches the specified number of times, the hot water temperature sensor 9 detects the combustion stop temperature TSa even when the hot water temperature of the can 1 changes temporarily. Since the number of times decreases, it becomes difficult for malfunction to occur, and the hot water in the can 1 is maintained at a high temperature, and the hot water temperature can be stabilized.

In the present invention, the temperature sensor 11 attached to the return pipe 7b detects the temperature of the circulating water returned from the radiator 6 to the can 1, and the timer means 12 when the temperature sensor 11 detects a predetermined temperature T1 or less. When the timer means 12 counts the predetermined time t1 while the temperature sensor 11 detects the predetermined temperature T1 or less, the circulation pump 8 is stopped and the combustion stop temperature TSb of the burner 2 is changed to a higher value. Even when the burner 2 burns, the temperature sensor 11 continues to detect a temperature equal to or lower than the predetermined temperature T1 when the hot water temperature in the can body 1 is low. It became possible to raise the hot water temperature. Further, when the hot water temperature sensor 9 detects the combustion stop temperature TSb before the change, the operation of the circulation pump 8 is resumed while the burner 2 is combusted until the hot water temperature sensor 9 detects the changed combustion stop temperature TSh. Since the burner 2 continues to burn, when the circulating water is sent to the radiator 6, the hot water temperature of the can 1 is not greatly reduced, and the radiator 6 is surely supplied with hot water that has risen to the set temperature TS. It became something that could be sent.
For this reason, when the radiator 6 is a hot air heater, it is possible to prevent the user from feeling uncomfortable by blowing out cold air for a long time, and comfortable heating becomes possible. Further, when the radiator 6 is a hot water panel for melting snow, the operation is not continued while the hot water temperature is lowered, and the occurrence of condensation in the heat exchanger 5 can be prevented.

When the temperature detected by the hot water temperature sensor 9 is higher than the combustion start temperature TSa at the start of the operation of the radiator 6, the circulation pump 8 is driven while the burner 2 is stopped, and the hot water temperature sensor 9 decreases below the combustion start temperature TSa. When detected, the burner 2 starts to burn. When the circulation pump 8 is driven, the circulating water in the forward pipe 7a and the radiator 6 is returned from the return pipe 7b to the can 1 so that the temperature sensor 11 of the return pipe 7b may detect a predetermined temperature T1 or less. Since the hot water near the set temperature TS in the can 1 can be sent to the vessel 6 to maintain a high temperature, there is no need to stop the circulation pump 8.
Therefore, even when the temperature sensor 11 detects a temperature equal to or lower than the predetermined temperature T1, the timer unit 12 is configured not to operate so that the circulation pump 8 continues to operate and the supply of hot water is not stopped. It was possible to respond immediately to the heating requirements of the company and improved usability.

  In another embodiment, when the temperature detected by the hot water temperature sensor 9 is higher than the combustion start temperature TSa and the circulation pump 8 is operated with the burner 2 stopped, the temperature sensor 11 detects a predetermined temperature T1 or less. When the timer means 12 is activated, and the timer means 12 counts for a predetermined time t1, combustion of the burner 2 is started while the circulation pump 8 is driven. In this structure, since the burner 2 starts combustion before the hot water temperature in the can 1 falls to the combustion start temperature TSa, the set temperature TS can be maintained without greatly reducing the temperature of the hot water in the can 1. Thus, the temperature of the hot water sent to the radiator 6 is not lowered, and the heating capacity of the radiator 6 can be stably maintained.

  Further, the control means 10 is provided with a circulation start temperature TC that is set higher than the combustion start temperature TSa of the burner 2 and lower than the combustion stop temperature TSb, and when there is a heating request from the radiator 6, When the detected temperature is lower than the combustion start temperature TSa, combustion of the burner 2 is started while the circulation pump 8 is stopped, and the circulation pump 8 is driven after the hot water temperature sensor 9 detects the circulation start temperature TC. For this reason, when the hot water temperature in the can body 1 is low, the hot water in the can body 1 is raised to the vicinity of the set temperature TS and then the circulation pump 8 is driven, so that the low temperature hot water is sent to the radiator 6. Therefore, the hot water in the can 1 can be boiled in a short time, and the usability can be improved.

  Further, a second timer means 13 is provided that operates when the hot water temperature sensor 9 detects the combustion stop temperature TSb or higher. When the hot water temperature sensor 9 detects the combustion stop temperature TSb during combustion of the burner 2, the second timer means 13 is provided. 2 When the timer 13 is activated and the temperature detected by the hot water temperature sensor 9 becomes equal to or lower than the combustion stop temperature TSb before the second timer 13 counts for the predetermined time t2, the count is stopped and the burner 2 continues to burn. On the other hand, when the second timer means 13 counts the predetermined time t2 while the detected temperature of the hot water temperature sensor 9 is equal to or higher than the combustion stop temperature TSb, the combustion of the burner 2 is stopped. When a plurality of radiators 6 are connected and used, the temperature of the circulating water returned from the radiator 6 to the can 1 is likely to vary, and the temperature detected by the hot water temperature sensor 9 may change greatly. However, in this configuration, even if the hot water temperature rises temporarily, the burner 2 continues to burn, so the burner 2 does not frequently repeat combustion and stop. For this reason, the temperature in the can 1 can be stabilized, and the number of occurrences of noise accompanying ignition / extinguishing can be suppressed.

The second timer means 13 is provided with a counter means 14. The counter means 14 counts the number of times when the second timer means 13 stops before counting for a predetermined time t2, and the counter means 14 designates it. When the number of times is reached, the combustion stop temperature TSb of the burner 2 is changed to a higher value.
If the temperature of the hot water changes near the combustion stop temperature TSb of the burner 2, malfunction tends to occur. However, by changing the combustion stop temperature TSb higher, the number of times that the hot water temperature sensor 9 detects the combustion stop temperature TSb may be reduced. Even when the hot water temperature temporarily changes near the combustion stop temperature TSb, the malfunction does not occur, and the temperature of the hot water returned from the radiator 6 increases as the temperature of the hot water sent to the radiator 6 increases. Therefore, the burner 2 does not frequently repeat combustion and stop, and a stable heating capacity can be obtained.

It is a block diagram which shows the structure of the water heater of this invention. It is explanatory drawing which comprised the heat radiator which shows the Example of this invention with the warm air heating apparatus. It is explanatory drawing which comprised the heat radiator which shows the Example of this invention with the snow melting apparatus. It is a flowchart which shows operation | movement of the control means of the Example of this invention. It is a flowchart which shows operation | movement of the other Example of this invention. It is a flowchart which shows the combustion stop operation | movement of the Example of this invention.

  The present invention will be described with reference to the embodiments shown in the drawings. Reference numeral 2 denotes a burner serving as a heat source for the water heater, 5 denotes a heat exchanger for heating water with the combustion heat of the burner 2, and 1 denotes a cylinder constituting the heat exchanger 5. 3 is a combustion chamber in which the combustion gas of the burner 2 disposed inside the lower portion of the can body 1 is sent, 15 is an exhaust gas chamber disposed at the upper portion of the can body 1, and 4 is a combustion chamber 3 and an exhaust gas chamber. 15 is an exhaust pipe connected to the exhaust gas chamber 15. When the burner 2 is operated, the combustion flame and the combustion gas are sent to the combustion chamber 3. 4 is sent to the exhaust gas chamber 15 and discharged from the exhaust cylinder 16.

  Reference numeral 17 denotes a water chamber constituting the heat exchanger 5 having the wall of the combustion chamber 3 and the wall of the combustion gas flow path 4 as a heat exchanging portion, 9 denotes a hot water temperature sensor provided on the side wall of the can 1, and 10 denotes combustion in the burner 2. Control means 18 for issuing a start or stop command, 18 is a temperature setting means for setting the tapping temperature, and the combustion start temperature TSa and the combustion stop temperature TSb of the burner 2 are determined based on the set temperature TS of the temperature setting means 18. When the hot water temperature sensor 9 detects the combustion start temperature TSa or less, the control means 10 outputs a combustion start signal, the burner 2 starts combustion, and when the hot water temperature sensor 9 detects the combustion stop temperature TSb, the control means 10 A combustion stop signal is output, the burner 2 stops combustion, and the water in the water chamber 17 is boiled up to the hot water temperature set by the temperature setting means 18.

  7a is a forward pipe connected to the upper side wall of the can body 1, 7b is a return pipe connected to the lower side wall of the can body 1, 7 is a circulation pipe composed of the forward pipe 7a and the return pipe 7b, and 6 is an outgoing pipe 7a. It is a radiator connected to the heat exchanger 5 through the return pipe 7b. Reference numeral 8 denotes a circulation pump attached in the middle of the forward pipe 7a. When the circulation pump 8 is driven, hot water in the water chamber 17 is sent from the forward pipe 7a to the radiator 6, and the heat radiator 6 releases heat to lower the temperature. When the heated water is returned from the return pipe 7b to the water chamber 17 and the hot water temperature sensor 9 detects a decrease in the hot water temperature, the control means 10 outputs a combustion start signal, the burner 2 burns, and is set by the temperature setting means 18. The water returned to the water chamber 17 constitutes a hot water circulation circuit in which the water returned to the water chamber 17 becomes warm water again and is sent to the radiator 6 for circulation.

  The radiator 6 connected to the hot water heater includes a hot air heater that exchanges heat with hot water and blows out hot air, and a hot water panel for floor heating and outdoor snow melting. Moreover, the circulation pipe 7 is branched in the middle, and a plurality of radiators 6 can be connected to one water heater, and the hot water can be sent to only one unit or a plurality of units simultaneously.

  FIG. 2 shows an embodiment in which the radiator 6 is constituted by a warm air heater. 19 is a frame of a warm air heater installed indoors, 20 is a convection fan disposed in the frame 19, and 21 is a frame 1. A heating heat exchanger arranged in the interior, 22 is an air outlet arranged in front of the frame body 1, and when the operation of the warm air heater is started, the control means 10 operates the circulation pump 8 to warm the hot water of the can body 1. Is sent to the heating heat exchanger 21 via the forward pipe 7a, and the amount of hot water released from the heating heat exchanger 21 when the air flow of the convection fan 20 passes through the heating heat exchanger 21 is Heated and warm air is blown into the room through the air outlet 22.

  By the way, in the hot water storage type water heater, since the inside of the can 1 is cold water immediately after the start of operation, and it takes time to boil the water in the can 1 to the set temperature, the radiator 6 immediately after the start of the operation of the water heater. When there is a request for heating from the hot air heater, since low temperature water is sent to the radiator 6, cold air blows out from the outlet 22 until the temperature of the hot water in the can 1 rises. During this period, the cold air continued to blow out, which was uncomfortable for the user.

  FIG. 3 shows an embodiment in which the radiator 6 is used as a water heater for melting snow, 23 is a hot water panel embedded in a road surface such as a road, 24 is a snow sensor for detecting snow, and from the snow sensor 24 When the snowfall detection signal is output, the control means 10 drives the circulation pump 8 so that the hot water in the can 1 is sent to the hot water panel 23, and the hot water panel 23 dissipates the amount of heat of the hot water to When the ice is melted and the snowfall sensor 24 no longer outputs a snowfall detection signal, the operation of the circulation pump 8 is stopped.

  When used as a snow melting device, the set temperature of the can body 1 is generally lower than when used as a warm air heater, so the temperature in the can body 1 is low, and the combustion chamber 3 moves toward the exhaust gas chamber 15. The temperature of the combustion gas is likely to decrease, and moisture contained in the combustion gas is likely to condense. In particular, when the outside air temperature is extremely low and a load exceeding the capacity of the water heater is applied, the temperature of the water chamber 17 cannot be increased, the hot water temperature of the water chamber 17 is lowered, and the hot water temperature of the water chamber 17 is lower than the set temperature. Then, the dew condensation generated on the walls of the combustion gas flow path 4 and the exhaust gas chamber 15 increases, and the water adhering to the combustion gas flow path 4 walls and the exhaust gas chamber 15 wall adheres to the combustion gas flow path 4 and the exhaust gas. Since it causes corrosion of the gas chamber 15, it is necessary to take measures to prevent condensation.

  The present invention solves the above-mentioned problems, 11 is a temperature sensor attached to the return pipe 7b, 12 is a timer means provided in the control means 10, and the temperature sensor 11 is returned from the radiator 6 to the can 1. The temperature of the warm water in the return pipe 7b is detected, and the timer means 12 operates when the temperature detected by the temperature sensor 11 is equal to or lower than a predetermined temperature T1. The predetermined temperature T1 is changed according to the temperature set by the temperature setting means 18. When the set temperature TS is increased, the predetermined temperature T1 is also increased, and when the set temperature TS is decreased, the predetermined temperature T1 is decreased.

  4 is an embodiment of the control operation of the hot water heater, and the control means 10 starts counting of the timer means 12 when the temperature sensor 11 detects the predetermined temperature T1 or less, and the temperature sensor during the counting of the timer means 12 When the detected temperature 11 becomes higher than the predetermined temperature T1, the timer 12 stops counting. On the other hand, when the timer unit 12 counts the predetermined time t1 while the temperature sensor 11 detects the predetermined temperature T1 or less, the combustion stop temperature TSh higher than the combustion stop temperature TSb of the set temperature TS set by the temperature setting unit 18 is set. At the same time, the operation of the circulation pump 8 is stopped.

  Even after the circulation pump 8 is stopped, the burner 2 continues to burn, and when the hot water temperature sensor 9 detects the combustion stop temperature TSb before the change, the operation of the circulation pump 8 is resumed. The combustion of the burner 2 is continued until the combustion stop temperature TSh after the change is detected, and the hot water in the can body 1 is set in a short time by stopping the operation of the circulation pump 8 while the burner 2 is burning. It can be boiled up to temperature TS.

  Since the circulation pump 8 is operated after the hot water temperature of the can body 1 has risen, even if the hot air heater is started immediately after the operation of the water heater, the cold air is blown from the outlet 22 for a long time. No more discomfort to users. Further, when the hot water temperature in the can body 1 rises to the combustion stop temperature TSb of the set temperature TS, the operation of the circulation pump 8 is resumed while the burner 2 is combusted. Even if the low temperature circulating water of the radiator 6 and the circulation pipe 7 is returned to the can body 1 by being sent, the set temperature TS can be maintained while suppressing the decrease in the hot water temperature of the can body 1. The warm air heater which is 6 can blow out warm air reliably.

  On the other hand, when used as a water heater for melting snow, the operation of the circulation pump 8 is stopped when the hot water temperature in the can body 1 cannot be increased due to a decrease in the outside air temperature or the like. The temperature can be raised to the set temperature TS, and the operation is not continued while the hot water temperature is lowered, and the occurrence of condensation due to the temperature drop of the combustion gas can be prevented. Moreover, since the temperature of the hot water in the can 1 becomes high by changing the combustion stop temperature TSb to be high, and the warm water to the temperature higher than the set temperature TS is sent to the radiator 6, the decrease in the hot water temperature is suppressed. be able to.

  Further, when the water heater is operating in advance, the hot water temperature in the can 1 is maintained at the set temperature TS, and when the temperature detected by the hot water temperature sensor 9 is higher than the combustion start temperature TSa, the radiator 6 is operated. Is started, the circulation pump 8 starts operation while the burner 2 is stopped. Immediately after the operation of the circulation pump 8 is started, the low temperature circulating water of the circulation pipe 7 and the radiator 6 is returned, so that the temperature detected by the temperature sensor 11 may be a predetermined temperature T1 or less. Since the hot water in the can 1 maintained by TS is sent and the radiator 6 can be maintained at a high temperature, there is no need to stop the circulation pump 8.

  For this reason, when the hot water temperature in the can body 1 is maintained at the set temperature TS, the timer means 12 does not operate even if the temperature sensor 11 detects the predetermined temperature T1 or less. When the circulation pump 8 is operated in response to an operation request from 6, the hot water in the can 1 is sent to the radiator 6, and the circulating water in the circulation pipe 7 and the radiator 6 is returned to the can 1 and hot water in the can 1. If the temperature falls, the hot water temperature sensor 9 detects the combustion start temperature TSa or less and starts combustion of the burner 2, so that the hot water temperature in the can 1 rises, and the hot water sent to the radiator 6 is heated. Therefore, the radiator 6 can maintain a high temperature after the operation is started. For this reason, when the radiator 6 is composed of a warm air heater, the warm air can be blown out immediately after the start of operation, and since the circulation pump 8 does not stop halfway, the hot air is continuously blown out. As a result, usability can be improved.

  Further, in another embodiment of the present invention shown in the flowchart of FIG. 5, when the temperature detected by the hot water temperature sensor 9 is higher than the combustion start temperature TSa, the operation of the radiator 6 is started and the burner 2 is stopped and circulated. When the pump 8 starts operation, the control means 10 confirms the temperature detected by the temperature sensor 11, and when the temperature detected by the temperature sensor 11 is equal to or lower than the predetermined temperature T1, the timer means 12 is activated. When the time t1 is counted, the burner 2 starts to burn regardless of the temperature detected by the hot water temperature sensor 9. When the low-temperature circulating water is continuously returned to the can body 1, the hot water temperature in the can body 1 may be easily lowered. In this configuration, the hot water temperature in the can body 1 is equal to or lower than the combustion start temperature TSa. Since the burner 2 starts to burn before the temperature drops, the hot water temperature in the can 1 is not greatly lowered, and the radiator 6 can be supplied with hot water maintaining the set temperature TS. .

Further, the control means 10 is provided with a circulation start temperature TC that is set higher than the combustion start temperature TSa of the burner 2 and lower than the combustion stop temperature TSb, and is detected by the hot water temperature sensor 9 when the operation of the radiator 6 is started. When the temperature is lower than the combustion start temperature TSa, combustion of the burner 2 is started while the circulation pump 8 is stopped, and the circulation pump 8 is driven when the hot water temperature sensor 9 detects the circulation start temperature TC.
With this configuration, when the hot water temperature in the can body 1 is lower than the combustion start temperature TSa, the hot water temperature in the can body 1 can be raised in a short time, and the hot water temperature sensor 9 detects the circulation start temperature TC. When the circulation pump 8 starts operation, the hot water temperature in the can body 1 is higher than the combustion start temperature TSa. Therefore, the hot water temperature in the can body 1 is not greatly lowered and can maintain a high temperature. The time until the hot water panel 23 warms up and the time until the wind blown from the hot air heater becomes hot air are shortened, and the usability can be improved.

  By the way, when a plurality of radiators 6 are connected to the water heater, when the plurality of radiators 6 are operated simultaneously, the heat dissipation amounts of the radiators 6 are different from each other, so that they are returned to the can 1. Variations in hot water temperature are likely to occur. Further, when the number of operating radiators 6 is changed, the amount of heat release may change suddenly, and the temperature of the hot water returned to the can 1 may change greatly. When the hot water temperature sensor 9 detects such a change in the hot water temperature, the burner 2 may be repeatedly burned and stopped within a short time, and noise and odor are often generated due to ignition and extinguishing of the burner 2. Happens.

  FIG. 6 shows the operation when the hot water temperature sensor 9 detects the combustion stop temperature TSb, and 13 is a second timer means that operates when the temperature detected by the hot water temperature sensor 9 is higher than the combustion stop temperature TSb. Even if the hot water temperature sensor 9 detects the combustion stop temperature TSb, the control means 10 does not immediately output a combustion stop signal, and the second timer means 13 starts counting. When the hot water temperature sensor 9 detects the combustion stop temperature TSb or less during the counting of the second timer means 13, the second timer means 13 stops counting, while the detected temperature of the hot water temperature sensor 9 remains higher than the combustion stop temperature TSb. When the second timer means 13 counts for a predetermined time t2, the control means 10 outputs a combustion stop signal and the combustion of the burner 2 is stopped.

  With the above configuration, even if the hot water temperature in the can 1 fluctuates greatly and the detected temperature of the hot water temperature sensor 9 temporarily becomes higher than the combustion stop temperature TSb, the count time of the second timer means 13 is predetermined. Since the burner 2 continues to burn until the time t2 elapses, even when the hot water temperature in the can 1 is not stable, the burner 2 does not frequently repeat the combustion and stop, and the number of times of ignition / extinguishing decreases. It is possible to stabilize the hot water temperature in the can 1 and suppress the generation of noise and odor.

  Reference numeral 14 denotes counter means provided in the second timer means 13, reference numeral 25 denotes correction means for correcting the set temperature of the temperature setting means 18, and the counter means 14 stops before the second timer means 13 counts for a predetermined time t2. Count the number of times In the embodiment, the upper limit value of the count number of the counter means 14 is set to 3 times, and when the count number of the counter means 14 reaches 3 times the upper limit value, the correction means 25 causes the combustion stop temperature TSb to be higher by a predetermined temperature. The set temperature TS is changed so that the control means 10 performs combustion control of the burner 2 based on the changed combustion stop temperature TSb.

  When the hot water temperature sensor 9 repeatedly detects the combustion stop temperature TSb, there is a possibility that the temperature changes near the combustion stop temperature TSb, so that the malfunction or the temperature on the radiator 6 side may not be stable. By changing TSb higher, the number of times of detecting the changed combustion stop temperature TSb is reduced, and malfunction due to a temporary temperature change of the can body 1 can be surely prevented. It became possible to stabilize the temperature of hot water.

TSa Combustion start temperature TSb Combustion stop temperature TSh Combustion stop temperature after change TS Set temperature T1 Predetermined temperature TC Circulation start temperature t1 Predetermined time t2 Predetermined time 1 Can body 2 Burner 3 Combustion chamber 4 Combustion gas flow path 5 Heat exchanger 6 Heat dissipation 7a forward pipe 7b return pipe 8 circulating pump 9 hot water temperature sensor 10 control means 11 temperature sensor 12 timer means 13 second timer means 14 counter means

Claims (6)

A burner (2) serving as a heat source in the can (1) of the water heater, a combustion chamber (3) to which combustion gas generated in the burner (2) is sent, and a combustion chamber (3) wall or combustion chamber (3) And a heat exchanger (5) having a wall as a heat exchanging part (4),
The can body (1) and the radiator (6) are connected via the forward pipe (7a) and the return pipe (7b), and a circulation pump (8) is attached to the forward pipe (7a) to circulate hot water. Configure the circuit (A),
A hot water temperature sensor (9) attached to the side wall of the can body (1) and control means (10) for controlling the operation of the burner (2) based on detection data of the hot water temperature sensor (9) are provided. ,
The control means (10) outputs a combustion start signal to the burner (2) when the hot water temperature sensor (9) detects the combustion start temperature (TSa), and the hot water temperature sensor (9) detects the combustion stop temperature (TSb). Sometimes a combustion stop signal is output to the burner (2) to maintain the hot water temperature in the can (1) at the set temperature (TS),
In the hot water heating apparatus in which the circulation pump (8) is driven to circulate hot water between the can (1) and the radiator (6),
Based on the temperature sensor (11) that is attached to the return pipe (7b) and detects the temperature of the circulating water that is returned from the radiator (6) to the can (1), and the temperature detected by the temperature sensor (11). Timer means (12) for operating
The control means (10) operates the timer means (12) when the temperature detected by the temperature sensor (11) is equal to or lower than a predetermined temperature (T1), and the timer means (12) counts for a predetermined time (t1). When the circulation pump (8) is stopped, the combustion stop temperature (TSb) of the burner (2) is changed to be high,
When the hot water temperature sensor (9) detects the combustion stop temperature (TSb) before the change, the operation of the circulation pump (8) is resumed, and the hot water temperature sensor (9) restarts the combustion stop temperature (TSh) after the change. A control device for a hot water heating device, characterized in that the combustion of the burner (2) is continued until detection is made. When the temperature detected by the hot water temperature sensor (9) is higher than the combustion start temperature (TSa) and the circulation pump (8) is driven with the burner (2) stopped,
The control device for a hot water heating apparatus according to claim 1, wherein the timer means (12) is not operated even if the temperature detected by the temperature sensor (11) is equal to or lower than the predetermined temperature (T1). When the temperature detected by the hot water temperature sensor (9) is higher than the combustion start temperature (TSa) and the circulation pump (8) is driven with the burner (2) stopped,
When the temperature detected by the temperature sensor (11) is equal to or lower than the predetermined temperature (T1), the timer means (12) is activated,
When the timer means (12) counts for a predetermined time (t1) before the hot water temperature sensor (9) detects the combustion start temperature (TSa) or less, the burner is operated with the circulation pump (8) being driven. 2. The control apparatus for a hot water heating apparatus according to claim 1, wherein the combustion of (2) is started. The control means (10) includes a circulation start temperature (TC) of the circulation pump (8) set higher than the combustion start temperature (TSa) of the burner (2) and lower than the combustion stop temperature (TSb),
If the temperature detected by the hot water temperature sensor (9) is equal to or lower than the combustion start temperature (TSa) at the start of operation of the hot water heater, combustion of the burner (2) is started with the circulation pump (8) stopped. And
The control device for a hot water heating apparatus according to claim 2 or 3, wherein when the hot water temperature sensor (9) detects the circulation start temperature (TC), the circulating pump (8) is driven.   Second timer means (13) that operates based on the temperature detected by the hot water temperature sensor (9) is provided, and the control means (10) has a temperature detected by the hot water temperature sensor (9) equal to or higher than the combustion stop temperature (TSb). At the same time, the second timer means (13) is operated, while the second timer means (13) is in operation, the burner (2) continues to burn, and the second timer means (13) t2) The control device for a hot water heating apparatus according to claims 1 to 4, characterized in that combustion of the burner (2) is stopped when counted. The second timer means (13) is provided with a counter means (14). When the second timer means (13) stops before counting for a predetermined time (t2), the counter means (14) counts and adds. ,
6. The control apparatus for a hot water heater according to claim 5, wherein when the counter means (14) reaches a specified number of times, the combustion stop temperature (TSb) is changed to a higher value.

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