WO2011073962A2 - Method of controlling cold and hot water supply system - Google Patents

Method of controlling cold and hot water supply system Download PDF

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Publication number
WO2011073962A2
WO2011073962A2 PCT/IB2011/050613 IB2011050613W WO2011073962A2 WO 2011073962 A2 WO2011073962 A2 WO 2011073962A2 IB 2011050613 W IB2011050613 W IB 2011050613W WO 2011073962 A2 WO2011073962 A2 WO 2011073962A2
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WO
WIPO (PCT)
Prior art keywords
water
hot
cold
mixed
temperature
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PCT/IB2011/050613
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French (fr)
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WO2011073962A3 (en
Inventor
Yeongchun Lee
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Pip Co., Ltd.
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Publication date
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Publication of WO2011073962A2 publication Critical patent/WO2011073962A2/en
Publication of WO2011073962A3 publication Critical patent/WO2011073962A3/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D17/00—Domestic hot-water supply systems
    • F24D17/0078—Recirculation systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D19/00—Details
    • F24D19/10—Arrangement or mounting of control or safety devices
    • F24D19/1006—Arrangement or mounting of control or safety devices for water heating systems
    • F24D19/1051—Arrangement or mounting of control or safety devices for water heating systems for domestic hot water
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D17/00—Domestic hot-water supply systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D2220/00—Components of central heating installations excluding heat sources
    • F24D2220/04—Sensors
    • F24D2220/042—Temperature sensors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D2220/00—Components of central heating installations excluding heat sources
    • F24D2220/04—Sensors
    • F24D2220/044—Flow sensors
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D23/00—Control of temperature
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D7/00—Control of flow

Definitions

  • the present invention relates, in general, to a cold and hot water supply system
  • thermo valve and geared motor assembly having an improved control unit that is an improvement invention of Korean Patent No. 10-0927163 and, more particularly, to a method of controlling a cold and hot water supply system which does not discharge water remaining in a pipe through a tap, circulates the water, heats the water in a hot- water boiler, and controls the temperature of the water to a set temperature in a thermo valve and geared motor assembly, wherein a boiler cold-water supply pipe, a hot- water distribution pipe, a mixed- water pipe and a circulating- water pipe are arranged to enable smooth circulation, so that only cold water remaining in a pipe returns through the circulating- water pipe and is heated in the hot- water boiler without the inflow of cold water from a water source during circulation, and the cold water is mixed with hot water in the thermo valve and geared motor assembly to conform to a set temperature, thus supplying mixed water of a desired temperature, a timer is provided on a control unit to prevent overheating or damage due to the malfunction of a temperature control sensor, a tap of
  • an object of the present invention is to provide a method of controlling a cold and hot water supply system which does not discharge water remaining in a pipe through a tap, circulates the water, heats the water in a hot- water boiler, and controls the temperature of the water to a set temperature in a thermo valve and geared motor assembly, wherein a boiler cold-water supply pipe, a hot-water distribution pipe, a mixed- water pipe and a circulating- water pipe are arranged to enable smooth circulation, so that only cold water remaining in a pipe returns through the circulating- water pipe and is heated in the hot- water boiler without the inflow of cold water from a water source during circulation, and the cold water is mixed with hot water in the thermo valve and geared motor assembly to conform to a set temperature, thus supplying mixed water of a desired temperature, a timer is provided on a control unit to prevent overheating or damage due to the malfunction of a temperature control sensor, a tap of a zone or a tap of a sink visually and auditorily provides
  • the present invention provides a method of controlling a cold and hot water supply system including a boiler cold-water supply pipe which supplies cold water from a water source to a hot- water boiler; a hot- water distribution pipe which distributes hot water heated by the hot- water boiler; a circulating-water pipe which returns mixed water, remaining after being supplied to a tap water spout of a place where the mixed water is used, to a water circulating pump and supplies the mixed water to the hot- water boiler; one or more control zones which control the hot- water boiler, the water circulating pump, thermo valve and geared motor assemblies each having both a geared motor and a thermo valve which are integrated with each other, a temperature correction sensor, and a temperature control sensor so that, when a water-circulating-pump operating switch and a temperature control switch of a control board that sets a desired discharge temperature of mixed water are turned on to operate the water circulating pump, circulating water circulates through mixed- water pipes and the circulating- water pipe, and thus mixed water
  • control unit may include a timer to allow the water circulating pump to be automatically stopped when the predetermined time has passed after the water circulating pump was operated to initiate the circulation.
  • a first flow sensor may be provided at a position of the boiler cold-water supply pipe before it branches into the hot- water boiler, the thermo valve and geared motor assemblies, and the water circulating pump, and second and third flow sensors may be provided on the mixed- water pipes which are coupled to an outlet side of the thermo valve and geared motor assemblies to supply mixed water to the control zones, whereby, if a flow is not detected by the first flow sensor, it is determined that the mixed water is not used in all of the control zones, so that the control unit may perform control such that the supply of power to the system is cut off, and the control unit may perform control such that power is supplied to only an associated control zone in which a flow is detected by the second or third flow sensor.
  • the set temperature of the mixed water may be controlled to automatically return to a basic set temperature which is stored in the control unit.
  • the tap of the zone or the subsidiary control board of a sink may visually and auditorily give a warning about high temperature, using a screen and a speaker, when high temperature water of 40°C or higher is used in the control zone.
  • a check valve may be provided at a position in which the water circulating pump and the boiler cold-water supply pipe communicate with each other, thus preventing the cold water in the boiler cold-water supply pipe from flowing backwards through the water circulating pump to the circulating- water pipe when the water circulating pump is not in operation.
  • the present invention provides a method of controlling a cold and hot water supply system which does not discharge water remaining in a pipe through a tap, circulates the water, heats the water in a hot-water boiler, and controls the temperature of the water to a set temperature in a thermo valve and geared motor assembly, wherein a boiler cold-water supply pipe, a hot- water distribution pipe, a mixed- water pipe and a circulating-water pipe are arranged to enable smooth circulation, so that only cold water remaining in a pipe returns through the circulating- water pipe and is heated in the hot- water boiler without the inflow of cold water from a water source during circulation, and the cold water is mixed with hot water in the thermo valve and geared motor assembly to conform to a set temperature, thus supplying mixed water of a desired temperature, a timer is provided on a control unit to prevent overheating or damage due to the malfunction of a temperature control sensor, a tap of a zone or a tap of a sink visually and auditorily provides a high temperature warning to prevent other users from getting
  • FIG. 1 is a schematic view showing the construction of a cold and hot water supply system according to the present invention
  • FIG. 2 is a view showing the internal construction of a control unit of the cold and hot water supply system according to the present invention
  • FIG. 3 is a circuit diagram showing the control unit of the cold and hot water supply system according to the present invention.
  • FIG. 4 is a view illustrating a subsidiary control board of the present invention that indicates a warning signal that warns of high temperature.
  • FIG. 1 is a schematic view showing the construction of a cold and hot water supply system according to the present invention
  • FIG. 2 is a view showing the internal construction of a control unit of the cold and hot water supply system according to the present invention
  • FIG. 3 is a circuit diagram showing the control unit of the cold and hot water supply system according to the present invention
  • FIG. 4 is a view illustrating a subsidiary control board of the present invention that indicates a warning signal that warns of high temperature.
  • the present invention pertains to an improvement invention of Korean Patent No.
  • a boiler cold-water supply pipe 2 branches at a predetermined position to distribute cold water to one or more thermo valve and geared motor assemblies 22a and 22b each having a geared motor and a thermo valve that are integrated with each other.
  • a hot-water distribution pipe 20 distributes heated hot water to supply the hot water to the thermo valve and geared motor assemblies 22a and 22b.
  • a mixed- water pipe 23 supplies mixed water, which is regulated to a set temperature in the thermo valve and geared motor assembly 22a or 22b, to a place where the water is used.
  • a circulating- water pipe 30 is arranged to supply mixed water, which returns through the boiler cold-water supply pipe 2 after passing through a water circulating pump 31 and before branching off into the thermo valve and geared motor assemblies 22a and 22b, to a hot- water boiler 21.
  • the operation of the water circulating pump 31 enables water to smoothly circulate.
  • a timer 55 is additionally provided to a control unit 50 to prevent the hot- water boiler 21 from being overheated because of the malfunction of a temperature control sensor 70 and to prevent the thermo valve and geared motor assemblies 22a and 22b from being damaged because of an overload, thus preventing energy from being wasted. As shown in FIG.
  • a tap of another zone or a subsidiary control board 52 of a sink 42 visually and auditorily gives a warning about high temperature
  • a tap water spout visually gives a warning about high temperature, thus preventing other users from getting burnt.
  • flow sensors 72a and 72b are installed, respectively, in mixed- water pipes 23a and 23b which supply mixed water from the thermo valve and geared motor assemblies 22a and 22b to the places where it is used.
  • mixed- water pipes 23a and 23b which supply mixed water from the thermo valve and geared motor assemblies 22a and 22b to the places where it is used.
  • a check valve 74a is installed at a position in which the water circulating pump 31 and the boiler cold-water supply pipe 2 communicate with each other, regardless of whether the check valve is in front of or in back of the water circulating pump 31, thus preventing the cold water in the boiler cold-water supply pipe 2 from flowing backwards through the water circulating pump 31 to the circulating- water pipe 30 when the water circulating pump 31 is not in operation, thus preventing malfunctions.
  • cold water supplied from the exterior through a water source 1 branches off into a boiler cold-water supply pipe 2 which supplies cold water to a boiler, and water supply pipes 3 which directly supply cold water to respective places where water is used.
  • a system which has only mixed- water pipes 23 a and 23b and does not supply cold water using the water supply pipes 3 may also be easily applied.
  • the boiler cold-water supply pipe 2 branches off at a predetermined position to distribute and supply cold water to one or more thermo valve and geared motor assemblies 22a and 22b each having both a geared motor and a thermo valve which are integrated with each other.
  • a hot-water distribution pipe 20 distributes heated hot water and supplies the hot water to the thermo valve and geared motor assemblies 22a and 22b, and forms the mixed- water pipe 23 to supply mixed water of a set temperature from the thermo valve and geared motor assemblies 22a and 22b to respective places where water is used.
  • a circulating-water pipe 30 is arranged to supply mixed water, which returns through the boiler cold-water supply pipe 2 after passing through a water circulating pump 31 and before branching off into the thermo valve and geared motor assemblies 22a and 22b, to the hot- water boiler 21 and the cold-water side of the thermo valve and geared motor assembly 22a and 22b.
  • thermo valve and geared motor assemblies 22a and 22b In order to control the temperature of the water to a basic set temperature, cold water flowing from the exterior through the water source 1 must be supplied through the boiler cold-water supply pipe 2 to the cold-water side of the thermo valve and geared motor assemblies 22a and 22b. However, since there is no water that is discharged from the pipe through a water spout, the pipe is full of water. Hence, an additional amount of cold water may not be supplied to the cold-water side of the thermo valve and geared motor assemblies 22a and 22b.
  • thermo valve and geared motor assemblies 22a and 22b In order to control the temperature of water to the set temperature in the thermo valve and geared motor assemblies 22a and 22b, the opening ratio of a valve of the hot- water side is reduced, whereas the opening ratio of a valve of the cold-water side is increased.
  • FIG. 3 As the flow rate of hot water supplied to the hot- water side of the thermo valve and geared motor assemblies 22a and 22b is decreased, water which remains in the pipe and passes through the boiler cold-water supply pipe 2 by the water circulating pump 31 is not supplied to the hot- water boiler 21, but is bypassed to the left to be supplied to the cold-water side of the thermo valve and geared motor assemblies 22a and 22b.
  • This adjusts the temperature of water to a set temperature in conjunction with temperature correction sensors 70a and 70b which are installed in mixed- water pipes provided on the outlet sides of the thermo valve and geared motor assemblies 22a and 22b so as to circulate mixed water.
  • the circulating-water pipe 30 is not connected to a hot- water pipe but is connected to the boiler cold-water supply pipe 2, and is arranged to communicate with the thermo valve and geared motor assemblies 22a and 22b.
  • thermo valve and geared motor assemblies 22a and 22b As such, after hot water is mixed with water remaining in the pipe in the thermo valve and geared motor assemblies 22a and 22b, the mixed water is discharged to the mixed- water pipes 23a and 23b, and simultaneously the thermo valve and geared motor assemblies 22a and 22b are finely adjusted by the temperature correction sensors 70a and 70b to correct the temperature of the mixed water.
  • the mixed water corrected to a set temperature, is supplied through the mixed- water pipe 23a or 23b to each control zone 40a or 40b.
  • a temperature control sensor 70 detects that the temperature of the mixed water is similar to a basic set temperature (actually, the temperature is slightly lower than the basic set temperature, and has already reached the basic set temperature in each control zone 40a or 40b).
  • the water circulating pump 31 and the hot- water boiler 21 stop operating, so that the circulation of water is stopped.
  • the temperature control sensor 70 may be installed at any position of the water circulating pump 31, and its function does not reveal any difference depending on the position where it is installed.
  • the mixed water of a set temperature reaches the tap water spout 60 of each control zone 40a or 40b.
  • the water circulating pump 31 is not operated, and cold water introduced through the water source 1, in place of water remaining in the pipe, is supplied through the boiler cold- water supply pipe 2 to the hot- water boiler 21 and then is heated to become hot water.
  • the hot water is supplied through the hot- water distribution pipe 20 to the thermo valve and geared motor assemblies 22a and 22b.
  • the temperature of the water is controlled to a set temperature in the thermo valve and geared motor assemblies 22a and 22b and the temperature correction sensors 70a and 70b, thus providing mixed water.
  • the mixed water is continuously supplied through the mixed- water pipes 23 a and 23b to the respective control zones 40a and 40b.
  • a timer 55 is provided on a side of a main control board 51 of a control unit 50.
  • the water circulating pump 31 is operated and then a time set by the timer 55 of the main control board 51 has passed, the water circulating pump 31 and the hot- water boiler 21 are automatically stopped, so that the circulation of water is finished.
  • thermo valve and geared motor assemblies 22a and 22b because of the overheating of the hot- water boiler 21 and the overloading of the thermo valve and geared motor assemblies 22a and 22b, even if a sensor for controlling the circulation malfunctions (in this embodiment, the temperature control sensor 70 is used, but various sensors may be used), therefore advantageously protecting the system.
  • the set time of the timer 55 is 5 minutes. Even though the set time of 5 minutes is sufficient, the set time is not limited to 5 minutes.
  • the set time may vary depending on the area of a building in question, and may be appropriately adjusted based on the results of an initial test after the cold and hot water supply system of the present invention has been installed.
  • a screen 52e of a subsidiary control board 52 mounted to a wall of a sink 42 displays the message 'be careful about high temperature', the entirety of the screen 52e or a lamp 52c provided on a side of the screen 52e generates a red light, and a speaker 52d generates the voice saying "be careful about high temperature” or generates a harsh sound, thus visually and auditorily warning about the high temperature.
  • a screen 52e of a subsidiary control board 52 provided on a side of the tap water spout 60 displays the message 'be careful about high temperature', the entirety of the screen 52e or a lamp 52c provided on a side of the screen 52e generates a red light, thus visually providing a warning about high temperature to other users, therefore preventing an accident such as a burn from occurring.
  • the set temperature of the mixed water is controlled to automatically return to a basic set temperature which is stored in the control unit.
  • the set temperature of the mixed water is controlled to automatically return to the basic set temperature, so that accidents are prevented and it is not necessary to set the temperature every time, thus affording convenience to a user.
  • a first flow sensor 72 is installed at a position of the boiler cold-water supply pipe 2 before it branches off into the hot- water boiler 21, the thermo valve and geared motor assemblies 22a and 22b, and the water circulating pump 31. Further, second and third flow sensors 72a and 72b are installed at the mixed- water pipes 23a and 23b extending from the thermo valve and geared motor assemblies 22a and 22b to the control zones 40a and 40b, respectively. Thus, if flow is not detected by the first flow sensor 72, it is determined that the mixed water is not used in all the control zones 40a and 40b. In this case, the control unit 50 performs control such that the supply of power to the system is cut off.
  • control unit 50 performs control such that power is supplied to only an associated control zone in which flow is detected by the second or third flow sensor 72a or 72b.
  • Such a construction achieves a power saving effect.
  • a check valve 74a is provided on a portion in which the water circulating pump 31 and the boiler cold-water supply pipe 2 communicate with each other.
  • the check valve 74a prevents water from flowing backwards from the boiler cold- water supply pipe 2 through the water circulating pump 31 to the circulating- water pipe 30 when the water circulating pump 31 is not in operation, thus preventing the temperature control sensor 70 installed in the circulating-water pipe 30 from malfunctioning.
  • Reference numerals 1, 41, and 42 denote a water source, a valve box, and a sink, respectively.
  • the present invention provides a method of controlling a cold and hot water supply system which does not discharge water remaining in a pipe through a tap, circulates the water, heats the water in a hot-water boiler, and controls the temperature of the water to a set temperature in a thermo valve and geared motor assembly, wherein a boiler cold-water supply pipe, a hot- water distribution pipe, a mixed- water pipe and a circulating-water pipe are arranged to enable smooth circulation, a timer is provided on a control unit to prevent overheating or damage due to the malfunction of a temperature control sensor, a tap of a zone visually and auditorily provides a high temperature warning to prevent other users from getting burnt while high temperature water is used in another zone, the temperature of water automatically returns to a basic set temperature after a predetermined time has passed after mixed water of a specific temperature is used and then the tap is closed, thus affording convenience to a user, the power of a hot water system is cut off unless flow is detected by a flow sensor within a predetermined period of time

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  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
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  • General Engineering & Computer Science (AREA)
  • Domestic Hot-Water Supply Systems And Details Of Heating Systems (AREA)

Abstract

Disclosed herein is a method of controlling a cold and hot water supply system. A boiler cold-water supply pipe, a hot-water distribution pipe, a mixed-water pipe and a circulating-water pipe are arranged to enable smooth circulation. A timer is provided on a control unit to prevent overheating or damage. A tap of a zone visually and auditorily provides a high temperature warning to prevent other users from getting burnt. The water temperature automatically returns to a basic set temperature after a predetermined time. The power of a hot water system is cut off unless flow is detected by a flow sensor within a predetermined period of time, and power is supplied to only a control zone in which flow is detected when hot water is used. A back flow from a water circulating pump to a circulating-water pipe is prevented when the water circulating pump is not in operation.

Description

METHOD OF CONTROLLING COLD AND HOT WATER SUPPLY SYSTEM
The present invention relates, in general, to a cold and hot water supply system having an improved control unit that is an improvement invention of Korean Patent No. 10-0927163 and, more particularly, to a method of controlling a cold and hot water supply system which does not discharge water remaining in a pipe through a tap, circulates the water, heats the water in a hot-water boiler, and controls the temperature of the water to a set temperature in a thermo valve and geared motor assembly, wherein a boiler cold-water supply pipe, a hot-water distribution pipe, a mixed-water pipe and a circulating-water pipe are arranged to enable smooth circulation, so that only cold water remaining in a pipe returns through the circulating-water pipe and is heated in the hot-water boiler without the inflow of cold water from a water source during circulation, and the cold water is mixed with hot water in the thermo valve and geared motor assembly to conform to a set temperature, thus supplying mixed water of a desired temperature, a timer is provided on a control unit to prevent overheating or damage due to the malfunction of a temperature control sensor, a tap of a zone or a tap of a sink visually and auditorily provides a high temperature warning to prevent other users from getting burnt while high temperature water is used in another zone, the temperature of water automatically returns to a basic set temperature after a predetermined time has passed after mixed water of a specific temperature is used and then the tap is closed, thus affording convenience to a user, the power of a hot water system is cut off unless flow is detected by a flow sensor within a predetermined period of time, and power is supplied to only a control zone in which flow is detected when hot water is used, thus realizing a power saving effect, and a back flow from a water circulating pump to a circulating-water pipe is prevented when the water circulating pump is not in operation.
The inventors of the present invention have proposed Korean Patent No. 10-0927163, which is entitled “a cold and hot water supply system with an improved control unit”. In this cold and hot water supply system, if a water-circulating-pump operating switch of a hot-water boiler 21 is turned on after a desired hot water temperature is set using a subsidiary control board 52 which is installed at an entrance of a bathroom and/or a side of a water spout, contact is made with a switch contact point of a hot-water boiler, so that a water circulating pump of a hot-water boiler is put into operation. When this happens, circulating water (cold water remaining in a pipe) is circulated through a mixed-water pipe and a circulating-water pipe, so that hot water having a temperature which is set by a temperature control switch of the hot-water boiler is discharged, in the form of mixed water which can be used immediately, through tap water spouts installed in a public bathroom, a kitchen, a private bathroom, a laundry room, or the like. Therefore, this system reduces the wasting of water which happens in the conventional method of using hot-water wherein a control lever of an integrated cold and hot water tap is moved upwards, downwards, leftwards and rightwards to discharge all the cold water remaining in the pipe and thereafter supply hot water of a desired temperature, in addition to affording a user with convenience.
However, while the cold and hot water supply system is tested for a lengthy period of time, the following several problems have been detected. In order to overcome the problems, the present invention has been proposed.
First, if water reaches a set temperature by reheating the water in the boiler while the cold and hot water supply system is circulating, a temperature control sensor is operated to cut off power to the water circulating pump and thus turn off the circulation. However, if the temperature control sensor malfunctions, the boiler may overheat and a thermo valve and geared motor assembly may be put out of order.
Further, while water is circulating to be heated up to a set temperature or high temperature water is being used in one of the control zones of the cold and hot water supply system, if a tap of another zone connected along the same pipe is opened or another user opens a tap in a sink 42 of FIG. 1, high temperature water which is supplied to the former control zone is discharged directly, thus causing an unexpected burn.
If a user has used mixed water of a specific temperature in one of the control zones of the cold and hot water supply system and then does not perform an additional temperature setting operation, mixed water of the temperature which was last set is discharged when another user reuses the cold and hot water supply system. Thus, in order to use mixed water of a general temperature, it is required to reset the temperature, inconveniencing a user.
Further, since power supplied to the cold and hot water supply system is always supplied to the water circulating pump, the thermo valve and geared motor assembly, etc., a lot of power is wasted in waiting mode.
When the water circulating pump is not in operation, water inside a boiler cold-water supply pipe may flow backwards through the water circulating pump to the circulating-water pipe and then may flow backwards to a mixed water pipe of each zone, so that mixed water of a temperature which is completely different from the set temperature may be undesirably discharged through the tap.
Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and an object of the present invention is to provide a method of controlling a cold and hot water supply system which does not discharge water remaining in a pipe through a tap, circulates the water, heats the water in a hot-water boiler, and controls the temperature of the water to a set temperature in a thermo valve and geared motor assembly, wherein a boiler cold-water supply pipe, a hot-water distribution pipe, a mixed-water pipe and a circulating-water pipe are arranged to enable smooth circulation, so that only cold water remaining in a pipe returns through the circulating-water pipe and is heated in the hot-water boiler without the inflow of cold water from a water source during circulation, and the cold water is mixed with hot water in the thermo valve and geared motor assembly to conform to a set temperature, thus supplying mixed water of a desired temperature, a timer is provided on a control unit to prevent overheating or damage due to the malfunction of a temperature control sensor, a tap of a zone or a tap of a sink visually and auditorily provides a high temperature warning to prevent other users from getting burnt while high temperature water is used in another zone, the temperature of water automatically returns to a basic set temperature after a predetermined time has passed after mixed water of a specific temperature is used and then the tap is closed, thus affording convenience to a user, the power of a hot water system is cut off unless flow is detected by a flow sensor within a predetermined period of time, and power is supplied to only a control zone in which flow is detected when hot water is used, thus realizing a power saving effect, and a back flow from a water circulating pump to a circulating-water pipe is prevented when the water circulating pump is not in operation.
In order to accomplish the above object, the present invention provides a method of controlling a cold and hot water supply system including a boiler cold-water supply pipe which supplies cold water from a water source to a hot-water boiler; a hot-water distribution pipe which distributes hot water heated by the hot-water boiler; a circulating-water pipe which returns mixed water, remaining after being supplied to a tap water spout of a place where the mixed water is used, to a water circulating pump and supplies the mixed water to the hot-water boiler; one or more control zones which control the hot-water boiler, the water circulating pump, thermo valve and geared motor assemblies each having both a geared motor and a thermo valve which are integrated with each other, a temperature correction sensor, and a temperature control sensor so that, when a water-circulating-pump operating switch and a temperature control switch of a control board that sets a desired discharge temperature of mixed water are turned on to operate the water circulating pump, circulating water circulates through mixed-water pipes and the circulating-water pipe, and thus mixed water of a temperature set by the temperature control switch is immediately discharged through the tap water spout provided in the place where the mixed water is used; and a control unit electrically and electronically connected to the control zones and to the water spout, thus controlling an operation of the hot-water boiler and the water circulating pump, and controlling a set temperature and flow rate of the mixed water when the mixed water is in use, wherein the boiler cold-water supply pipe branches at a predetermined position to distribute and supply cold water to a cold water side of the thermo valve and geared motor assemblies, and the hot-water distribution pipe distributes heated hot water and supplies the hot water to a hot water side of the thermo valve and geared motor assemblies and forms the mixed-water pipes to supply mixed water of a set temperature from the thermo valve and geared motor assemblies to the place where the mixed water is used, and the circulating-water pipe is arranged to supply mixed water, which returns through the boiler cold-water supply pipe after passing through the water circulating pump and before branching off into the thermo valve and geared motor assemblies, to the hot-water boiler, and, once circulation starts, the circulating water returned by the water circulating pump is heated by the hot-water boiler and is supplied to the hot water side of the thermo valve and geared motor assemblies, and non-heated circulating water (remaining circulating water) in place of cold water is supplied from the boiler cold-water supply pipe to the cold water side, so that a temperature of water is corrected to a set temperature merely by circulating the mixed water without discharging the mixed water and without adding cold water to the system, and is detected by a temperature control sensor provided in the circulating-water pipe whether the temperature reaches the set temperature or not, and thereafter the circulation is stopped.
Further, in order to prevent the water circulating pump from continuing to operate and overheating following a malfunction of the temperature control sensor provided in the circulating-water pipe, even after a predetermined time has passed after the water circulating pump was operated to initiate circulation, the control unit may include a timer to allow the water circulating pump to be automatically stopped when the predetermined time has passed after the water circulating pump was operated to initiate the circulation.
Further, a first flow sensor may be provided at a position of the boiler cold-water supply pipe before it branches into the hot-water boiler, the thermo valve and geared motor assemblies, and the water circulating pump, and second and third flow sensors may be provided on the mixed-water pipes which are coupled to an outlet side of the thermo valve and geared motor assemblies to supply mixed water to the control zones, whereby, if a flow is not detected by the first flow sensor, it is determined that the mixed water is not used in all of the control zones, so that the control unit may perform control such that the supply of power to the system is cut off, and the control unit may perform control such that power is supplied to only an associated control zone in which a flow is detected by the second or third flow sensor.
Further, if the mixed water has not been used for a predetermined period of time after the mixed water was controlled to the set temperature using a subsidiary control board in each of the control zones and was used, the set temperature of the mixed water may be controlled to automatically return to a basic set temperature which is stored in the control unit.
Further, in order to prevent a burn from occurring due to high temperature water discharged from a tap of a zone while the high temperature water of 40℃ or higher is used in another control zone, the tap of the zone or the subsidiary control board of a sink may visually and auditorily give a warning about high temperature, using a screen and a speaker, when high temperature water of 40℃ or higher is used in the control zone.
Further, a check valve may be provided at a position in which the water circulating pump and the boiler cold-water supply pipe communicate with each other, thus preventing the cold water in the boiler cold-water supply pipe from flowing backwards through the water circulating pump to the circulating-water pipe when the water circulating pump is not in operation.
According to the present invention, the following effect is achieved.
The present invention provides a method of controlling a cold and hot water supply system which does not discharge water remaining in a pipe through a tap, circulates the water, heats the water in a hot-water boiler, and controls the temperature of the water to a set temperature in a thermo valve and geared motor assembly, wherein a boiler cold-water supply pipe, a hot-water distribution pipe, a mixed-water pipe and a circulating-water pipe are arranged to enable smooth circulation, so that only cold water remaining in a pipe returns through the circulating-water pipe and is heated in the hot-water boiler without the inflow of cold water from a water source during circulation, and the cold water is mixed with hot water in the thermo valve and geared motor assembly to conform to a set temperature, thus supplying mixed water of a desired temperature, a timer is provided on a control unit to prevent overheating or damage due to the malfunction of a temperature control sensor, a tap of a zone or a tap of a sink visually and auditorily provides a high temperature warning to prevent other users from getting burnt while high temperature water is used in another zone, the temperature of water automatically returns to a basic set temperature after a predetermined time has passed after mixed water of a specific temperature is used and then the tap is closed, thus affording convenience to a user, the power of a hot water system is cut off unless flow is detected by a flow sensor within a predetermined period of time, and power is supplied to only a control zone in which flow is detected when hot water is used, thus realizing a power saving effect, and a back flow from a water circulating pump to a circulating-water pipe is prevented when the water circulating pump is not in operation. As a result, the present invention is very useful.
FIG. 1 is a schematic view showing the construction of a cold and hot water supply system according to the present invention;
FIG. 2 is a view showing the internal construction of a control unit of the cold and hot water supply system according to the present invention;
FIG. 3 is a circuit diagram showing the control unit of the cold and hot water supply system according to the present invention; and
FIG. 4 is a view illustrating a subsidiary control board of the present invention that indicates a warning signal that warns of high temperature.
Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 is a schematic view showing the construction of a cold and hot water supply system according to the present invention, FIG. 2 is a view showing the internal construction of a control unit of the cold and hot water supply system according to the present invention, FIG. 3 is a circuit diagram showing the control unit of the cold and hot water supply system according to the present invention, and FIG. 4 is a view illustrating a subsidiary control board of the present invention that indicates a warning signal that warns of high temperature.
The present invention pertains to an improvement invention of Korean Patent No. 10-0927163 which was filed by the applicant of the present invention and previously registered. As shown in FIGS. 2 and 3, a boiler cold-water supply pipe 2 branches at a predetermined position to distribute cold water to one or more thermo valve and geared motor assemblies 22a and 22b each having a geared motor and a thermo valve that are integrated with each other. A hot-water distribution pipe 20 distributes heated hot water to supply the hot water to the thermo valve and geared motor assemblies 22a and 22b. A mixed-water pipe 23 supplies mixed water, which is regulated to a set temperature in the thermo valve and geared motor assembly 22a or 22b, to a place where the water is used. A circulating-water pipe 30 is arranged to supply mixed water, which returns through the boiler cold-water supply pipe 2 after passing through a water circulating pump 31 and before branching off into the thermo valve and geared motor assemblies 22a and 22b, to a hot-water boiler 21. The operation of the water circulating pump 31 enables water to smoothly circulate. A timer 55 is additionally provided to a control unit 50 to prevent the hot-water boiler 21 from being overheated because of the malfunction of a temperature control sensor 70 and to prevent the thermo valve and geared motor assemblies 22a and 22b from being damaged because of an overload, thus preventing energy from being wasted. As shown in FIG. 4, while high temperature water is used in one of control zones 40a and 40b, a tap of another zone or a subsidiary control board 52 of a sink 42 visually and auditorily gives a warning about high temperature, and additionally, a tap water spout visually gives a warning about high temperature, thus preventing other users from getting burnt. After a predetermined time has passed after mixed water of a specific temperature has been used in one of the control zones 40a and 40b and then the tap was closed, the temperature of water returns automatically to a basic set temperature which is frequently used, thus affording convenience to a user. In addition to a flow sensor which is installed in the boiler cold-water supply pipe 2, flow sensors 72a and 72b are installed, respectively, in mixed- water pipes 23a and 23b which supply mixed water from the thermo valve and geared motor assemblies 22a and 22b to the places where it is used. Thus, unless a flow is detected for a predetermined period of time, power to a hot water system is cut off. Further, when hot water is used in the control zone 40a or 40b, the flow sensor of an associated mixed-water pipe detects the use of the hot water, so that power is supplied to only an associated control zone, and thus a power savings effect is realized. Further, a check valve 74a is installed at a position in which the water circulating pump 31 and the boiler cold-water supply pipe 2 communicate with each other, regardless of whether the check valve is in front of or in back of the water circulating pump 31, thus preventing the cold water in the boiler cold-water supply pipe 2 from flowing backwards through the water circulating pump 31 to the circulating-water pipe 30 when the water circulating pump 31 is not in operation, thus preventing malfunctions.
Hereinafter, the preferred embodiment of the present invention will be described in detail. It is to be understood that the embodiment merely aids in understanding the present invention, and does not limit the scope of the present invention.
(First Embodiment)
First, cold water supplied from the exterior through a water source 1 branches off into a boiler cold-water supply pipe 2 which supplies cold water to a boiler, and water supply pipes 3 which directly supply cold water to respective places where water is used. Here, it is obvious to those skilled in the art that a system which has only mixed- water pipes 23a and 23b and does not supply cold water using the water supply pipes 3 may also be easily applied.
Next, the boiler cold-water supply pipe 2 branches off at a predetermined position to distribute and supply cold water to one or more thermo valve and geared motor assemblies 22a and 22b each having both a geared motor and a thermo valve which are integrated with each other. A hot-water distribution pipe 20 distributes heated hot water and supplies the hot water to the thermo valve and geared motor assemblies 22a and 22b, and forms the mixed-water pipe 23 to supply mixed water of a set temperature from the thermo valve and geared motor assemblies 22a and 22b to respective places where water is used. A circulating-water pipe 30 is arranged to supply mixed water, which returns through the boiler cold-water supply pipe 2 after passing through a water circulating pump 31 and before branching off into the thermo valve and geared motor assemblies 22a and 22b, to the hot-water boiler 21 and the cold-water side of the thermo valve and geared motor assembly 22a and 22b.
By connecting the pipes to each other in this way, circulation is normally conducted and effective circulation using the laws of nature is achieved.
This will be described below in detail. As shown in FIG. 4, if a user controls a temperature using temperature control switches 52a of a subsidiary control board 52 and turns on a water-circulating-pump operating switch 52b, the water circulating pump 31 and the hot-water boiler 21 are operated. Thereby, as shown in FIG. 3, the water circulating pump 31 returns water remaining in the control zones 40a and 40b and the pipe, and makes the water flow through the boiler cold-water supply pipe 2 to the hot-water boiler 21. Hot water of a high temperature which is heated in the hot-water boiler 21 is supplied through the hot-water distribution pipe 20 to the hot-water side of the two thermo valve and geared motor assemblies 22a and 22b. In order to control the temperature of the water to a basic set temperature, cold water flowing from the exterior through the water source 1 must be supplied through the boiler cold-water supply pipe 2 to the cold-water side of the thermo valve and geared motor assemblies 22a and 22b. However, since there is no water that is discharged from the pipe through a water spout, the pipe is full of water. Hence, an additional amount of cold water may not be supplied to the cold-water side of the thermo valve and geared motor assemblies 22a and 22b.
Here, in order to control the temperature of water to the set temperature in the thermo valve and geared motor assemblies 22a and 22b, the opening ratio of a valve of the hot-water side is reduced, whereas the opening ratio of a valve of the cold-water side is increased. Referring to FIG. 3, as the flow rate of hot water supplied to the hot-water side of the thermo valve and geared motor assemblies 22a and 22b is decreased, water which remains in the pipe and passes through the boiler cold-water supply pipe 2 by the water circulating pump 31 is not supplied to the hot-water boiler 21, but is bypassed to the left to be supplied to the cold-water side of the thermo valve and geared motor assemblies 22a and 22b. This adjusts the temperature of water to a set temperature in conjunction with temperature correction sensors 70a and 70b which are installed in mixed-water pipes provided on the outlet sides of the thermo valve and geared motor assemblies 22a and 22b so as to circulate mixed water.
This uses the law of nature according to which a larger amount of water flows to a side having a smaller resistance. Thus, according to the present invention, the circulating-water pipe 30 is not connected to a hot-water pipe but is connected to the boiler cold-water supply pipe 2, and is arranged to communicate with the thermo valve and geared motor assemblies 22a and 22b.
Thus, in place of cold water, water remaining in the pipe, which is supplied to the hot-water boiler 21 through the water circulating pump 31 communicating with the boiler cold-water supply pipe 2, passes through the water circulating pump 31, branches off from the boiler cold-water supply pipe 2, and is supplied to the cold-water side of the thermo valve and geared motor assemblies 22a and 22b, so that the circulation of water is possible without the necessity of discharging water in the pipe through a tap water spout 60.
As such, after hot water is mixed with water remaining in the pipe in the thermo valve and geared motor assemblies 22a and 22b, the mixed water is discharged to the mixed- water pipes 23a and 23b, and simultaneously the thermo valve and geared motor assemblies 22a and 22b are finely adjusted by the temperature correction sensors 70a and 70b to correct the temperature of the mixed water.
The mixed water, corrected to a set temperature, is supplied through the mixed- water pipe 23a or 23b to each control zone 40a or 40b. When the mixed water passes through each control zone 40a or 40b and then flows through the circulating-water pipe 30 to the water circulating pump 31, a temperature control sensor 70 detects that the temperature of the mixed water is similar to a basic set temperature (actually, the temperature is slightly lower than the basic set temperature, and has already reached the basic set temperature in each control zone 40a or 40b). At this time, the water circulating pump 31 and the hot-water boiler 21 stop operating, so that the circulation of water is stopped. The temperature control sensor 70 may be installed at any position of the water circulating pump 31, and its function does not reveal any difference depending on the position where it is installed.
At this time, the mixed water of a set temperature reaches the tap water spout 60 of each control zone 40a or 40b.
Thereafter, once the mixed water remaining in the pipe starts to be used, the water circulating pump 31 is not operated, and cold water introduced through the water source 1, in place of water remaining in the pipe, is supplied through the boiler cold-water supply pipe 2 to the hot-water boiler 21 and then is heated to become hot water. Subsequently, the hot water is supplied through the hot-water distribution pipe 20 to the thermo valve and geared motor assemblies 22a and 22b. The temperature of the water is controlled to a set temperature in the thermo valve and geared motor assemblies 22a and 22b and the temperature correction sensors 70a and 70b, thus providing mixed water. The mixed water is continuously supplied through the mixed- water pipes 23a and 23b to the respective control zones 40a and 40b.
Further, as shown in FIGS. 2 and 3, a timer 55 is provided on a side of a main control board 51 of a control unit 50. When the water circulating pump 31 is operated and then a time set by the timer 55 of the main control board 51 has passed, the water circulating pump 31 and the hot-water boiler 21 are automatically stopped, so that the circulation of water is finished.
As such, the time that water is circulated to reheat water remaining in the pipe is limited, thus preventing the supply of hot water having a temperature which is higher than a set temperature, and preventing a failure in the thermo valve and geared motor assemblies 22a and 22b because of the overheating of the hot-water boiler 21 and the overloading of the thermo valve and geared motor assemblies 22a and 22b, even if a sensor for controlling the circulation malfunctions (in this embodiment, the temperature control sensor 70 is used, but various sensors may be used), therefore advantageously protecting the system.
Real experiments have established that the set time of the timer 55 is 5 minutes. Even though the set time of 5 minutes is sufficient, the set time is not limited to 5 minutes. For example, the set time may vary depending on the area of a building in question, and may be appropriately adjusted based on the results of an initial test after the cold and hot water supply system of the present invention has been installed.
Next, as shown in FIG. 1, if water is circulating to obtain a high temperature or high temperature water is being used in the control zone 40a, a screen 52e of a subsidiary control board 52 mounted to a wall of a sink 42 displays the message ‘be careful about high temperature’, the entirety of the screen 52e or a lamp 52c provided on a side of the screen 52e generates a red light, and a speaker 52d generates the voice saying “be careful about high temperature” or generates a harsh sound, thus visually and auditorily warning about the high temperature. Simultaneously, in the same manner as the screen 52e of a subsidiary control board 52 mounted to the wall of the sink 42, a screen 52e of a subsidiary control board 52 provided on a side of the tap water spout 60 displays the message ‘be careful about high temperature’, the entirety of the screen 52e or a lamp 52c provided on a side of the screen 52e generates a red light, thus visually providing a warning about high temperature to other users, therefore preventing an accident such as a burn from occurring.
Next, if the mixed water is not used for a predetermined period of time after the mixed water has been controlled to a set temperature using the subsidiary control board 52 in each control zone and the water was used, the set temperature of the mixed water is controlled to automatically return to a basic set temperature which is stored in the control unit.
Owing to such a control process, if a temperature which is frequently used by a user at normal times is set as a basic set temperature, the water-circulating-pump operating switch 52b is pushed, and a temperature is not additionally set, heating operation is started at the basic set temperature. Further, if the mixed water is not used for a predetermined period of time after the water-circulating-pump operating switch 52b is pushed to set a high-temperature-water temperature when a user desires to use high temperature water, or after the high-temperature-water temperature is set and then the water-circulating-pump operating switch 52b is pushed to use high temperature water, the set temperature of the mixed water is controlled to automatically return to the basic set temperature, so that accidents are prevented and it is not necessary to set the temperature every time, thus affording convenience to a user.
A first flow sensor 72 is installed at a position of the boiler cold-water supply pipe 2 before it branches off into the hot-water boiler 21, the thermo valve and geared motor assemblies 22a and 22b, and the water circulating pump 31. Further, second and third flow sensors 72a and 72b are installed at the mixed- water pipes 23a and 23b extending from the thermo valve and geared motor assemblies 22a and 22b to the control zones 40a and 40b, respectively. Thus, if flow is not detected by the first flow sensor 72, it is determined that the mixed water is not used in all the control zones 40a and 40b. In this case, the control unit 50 performs control such that the supply of power to the system is cut off. Meanwhile, if a user uses hot water in the control zone 40a or 40b, the control unit 50 performs control such that power is supplied to only an associated control zone in which flow is detected by the second or third flow sensor 72a or 72b. Such a construction achieves a power saving effect.
Further, a check valve 74a is provided on a portion in which the water circulating pump 31 and the boiler cold-water supply pipe 2 communicate with each other.
The check valve 74a prevents water from flowing backwards from the boiler cold-water supply pipe 2 through the water circulating pump 31 to the circulating-water pipe 30 when the water circulating pump 31 is not in operation, thus preventing the temperature control sensor 70 installed in the circulating-water pipe 30 from malfunctioning.
Reference numerals 1, 41, and 42 denote a water source, a valve box, and a sink, respectively.
Although the preferred embodiment of the present invention has been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims.
The present invention constructed and operated as described above achieves the follow effect.
The present invention provides a method of controlling a cold and hot water supply system which does not discharge water remaining in a pipe through a tap, circulates the water, heats the water in a hot-water boiler, and controls the temperature of the water to a set temperature in a thermo valve and geared motor assembly, wherein a boiler cold-water supply pipe, a hot-water distribution pipe, a mixed-water pipe and a circulating-water pipe are arranged to enable smooth circulation, a timer is provided on a control unit to prevent overheating or damage due to the malfunction of a temperature control sensor, a tap of a zone visually and auditorily provides a high temperature warning to prevent other users from getting burnt while high temperature water is used in another zone, the temperature of water automatically returns to a basic set temperature after a predetermined time has passed after mixed water of a specific temperature is used and then the tap is closed, thus affording convenience to a user, the power of a hot water system is cut off unless flow is detected by a flow sensor within a predetermined period of time, and power is supplied to only a control zone in which flow is detected when hot water is used, thus realizing a power saving effect, and a back flow from a water circulating pump to a circulating-water pipe is prevented when the water circulating pump is not in operation, so that the present invention is very useful.

Claims (6)

  1. A method of controlling a cold and hot water supply system including a boiler cold-water supply pipe which supplies cold water from a water source to a hot-water boiler; a hot-water distribution pipe which distributes hot water heated by the hot-water boiler; a circulating-water pipe which returns mixed water, remaining after being supplied to a tap water spout of a place where the mixed water is used, to a water circulating pump and supplies the mixed water to the hot-water boiler; one or more control zones which control the hot-water boiler, the water circulating pump, thermo valve and geared motor assemblies each having both a geared motor and a thermo valve which are integrated with each other, a temperature correction sensor, and a temperature control sensor so that, when a water-circulating-pump operating switch and a temperature control switch of a control board that sets a desired discharge temperature of mixed water are turned on to operate the water circulating pump, circulating water circulates through mixed-water pipes and the circulating-water pipe, and thus mixed water of a temperature set by the temperature control switch is immediately discharged through the tap water spout provided in the place where the mixed water is used; and a control unit electrically and electronically connected to the control zones and to the water spout, thus controlling an operation of the hot-water boiler and the water circulating pump, and controlling a set temperature and flow rate of the mixed water when the mixed water is in use,
    wherein the boiler cold-water supply pipe branches at a predetermined position to distribute and supply cold water to a cold water side of the thermo valve and geared motor assemblies, and the hot-water distribution pipe distributes heated hot water and supplies the hot water to a hot water side of the thermo valve and geared motor assemblies and forms the mixed-water pipes to supply mixed water of a set temperature from the thermo valve and geared motor assemblies to the place where the mixed water is used, and the circulating-water pipe is arranged to supply mixed water, which returns through the boiler cold-water supply pipe after passing through the water circulating pump and before branching off into the thermo valve and geared motor assemblies, to the hot-water boiler, and
    once circulation starts, the circulating water returned by the water circulating pump is heated by the hot-water boiler and is supplied to the hot water side of the thermo valve and geared motor assemblies, and non-heated circulating water (remaining circulating water) in place of cold water is supplied from the boiler cold-water supply pipe to the cold water side, so that a temperature of water is corrected to a set temperature merely by circulating the mixed water without discharging the mixed water and without adding cold water to the system, and is detected by a temperature control sensor provided in the circulating-water pipe whether the temperature reaches the set temperature or not, and thereafter the circulation is stopped.
  2. The method according to claim 1, wherein, in order to prevent the water circulating pump from continuing to operate and overheating following a malfunction of the temperature control sensor provided in the circulating-water pipe, even after a predetermined time has passed after the water circulating pump was operated to initiate circulation, the control unit comprises a timer to allow the water circulating pump to be automatically stopped when the predetermined time has passed after the water circulating pump was operated to initiate the circulation.
  3. The method according to claim 1, wherein a first flow sensor is provided at a position of the boiler cold-water supply pipe before it branches into the hot-water boiler, the thermo valve and geared motor assemblies, and the water circulating pump, and second and third flow sensors are provided on the mixed-water pipes which are coupled to an outlet side of the thermo valve and geared motor assemblies to supply mixed water to the control zones,
    whereby, if a flow is not detected by the first flow sensor, it is determined that the mixed water is not used in all of the control zones, so that the control unit performs control such that the supply of power to the system is cut off, and the control unit performs control such that power is supplied to only an associated control zone in which a flow is detected by the second or third flow sensor.
  4. The method according to claim 1, wherein, if the mixed water has not been used for a predetermined period of time after the mixed water was controlled to the set temperature using a subsidiary control board in each of the control zones and was used, the set temperature of the mixed water is controlled to automatically return to a basic set temperature which is stored in the control unit.
  5. The method according to claim 3, wherein, in order to prevent a burn from occurring due to high temperature water discharged from a tap of a zone while the high temperature water of 40℃ or higher is used in another control zone, the tap of the zone or the subsidiary control board of a sink visually and auditorily gives a warning about high temperature, using a screen and a speaker, when high temperature water of 40℃ or higher is used in the control zone.
  6. The method according to claim 3, wherein a check valve is provided at a position in which the water circulating pump and the boiler cold-water supply pipe communicate with each other, thus preventing the cold water in the boiler cold-water supply pipe from flowing backwards through the water circulating pump to the circulating-water pipe when the water circulating pump is not in operation.
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EP3270075A1 (en) * 2016-07-13 2018-01-17 Vaillant GmbH Gas-fired water heater with external pump for regulating temperature of outlet water

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