IE46248B1 - Improvements in electrical electronic control circuits - Google Patents

Improvements in electrical electronic control circuits

Info

Publication number
IE46248B1
IE46248B1 IE153/78A IE15378A IE46248B1 IE 46248 B1 IE46248 B1 IE 46248B1 IE 153/78 A IE153/78 A IE 153/78A IE 15378 A IE15378 A IE 15378A IE 46248 B1 IE46248 B1 IE 46248B1
Authority
IE
Ireland
Prior art keywords
tank
thermostat
boiler
temperature
pump
Prior art date
Application number
IE153/78A
Other versions
IE780153L (en
Original Assignee
Bhr Electronic Systems Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Bhr Electronic Systems Ltd filed Critical Bhr Electronic Systems Ltd
Publication of IE780153L publication Critical patent/IE780153L/en
Publication of IE46248B1 publication Critical patent/IE46248B1/en

Links

Classifications

    • 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
    • F24D19/1066—Arrangement or mounting of control or safety devices for water heating systems for the combination of central heating and domestic hot water
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H15/00—Control of fluid heaters
    • F24H15/10—Control of fluid heaters characterised by the purpose of the control
    • F24H15/156—Reducing the quantity of energy consumed; Increasing efficiency
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H15/00—Control of fluid heaters
    • F24H15/10—Control of fluid heaters characterised by the purpose of the control
    • F24H15/174—Supplying heated water with desired temperature or desired range of temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H15/00—Control of fluid heaters
    • F24H15/20—Control of fluid heaters characterised by control inputs
    • F24H15/212—Temperature of the water
    • F24H15/223—Temperature of the water in the water storage tank
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H15/00—Control of fluid heaters
    • F24H15/20—Control of fluid heaters characterised by control inputs
    • F24H15/254—Room temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H15/00—Control of fluid heaters
    • F24H15/30—Control of fluid heaters characterised by control outputs; characterised by the components to be controlled
    • F24H15/335—Control of pumps, e.g. on-off control
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H15/00—Control of fluid heaters
    • F24H15/30—Control of fluid heaters characterised by control outputs; characterised by the components to be controlled
    • F24H15/355—Control of heat-generating means in heaters
    • F24H15/36—Control of heat-generating means in heaters of burners
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H15/00—Control of fluid heaters
    • F24H15/30—Control of fluid heaters characterised by control outputs; characterised by the components to be controlled
    • F24H15/395—Information to users, e.g. alarms
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H15/00—Control of fluid heaters
    • F24H15/40—Control of fluid heaters characterised by the type of controllers
    • F24H15/486—Control of fluid heaters characterised by the type of controllers using timers
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D23/00—Control of temperature
    • G05D23/19—Control of temperature characterised by the use of electric means
    • G05D23/1927—Control of temperature characterised by the use of electric means using a plurality of sensors
    • G05D23/193—Control of temperature characterised by the use of electric means using a plurality of sensors sensing the temperaure in different places in thermal relationship with one or more spaces
    • G05D23/1932—Control of temperature characterised by the use of electric means using a plurality of sensors sensing the temperaure in different places in thermal relationship with one or more spaces to control the temperature of a plurality of spaces
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D23/00—Control of temperature
    • G05D23/19—Control of temperature characterised by the use of electric means
    • G05D23/275—Control of temperature characterised by the use of electric means with sensing element expanding, contracting, or fusing in response to changes of temperature
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

Description

The invention relates to a control circuit for a central heating system including a boiler having an electrically actuated firing means, an electrically powered pump and a hot water storage tank.
In a typical domestic or commercial central heating system providing both hot water for external use and hot water for heating through radiators there is provided a .solid fuel boiler which may be gas oi 1 or ' fired which has firing means for automatic firing which is dependant on receiving a signal from for example a thermostat which detects the desired temperature. On firing, the boiler heats Water in the boiler tubes and this water is used to heat, through ' an indirect heating coil, water in a hot water, Storage tank.
Additionally there is provided a pump for forced flow Of heated water from the boiler through radiators in the establishment to provide back ground and room heating.
It is desired to provide a control circuit for the operation of the pump and of the boiler to ensure a minimum consumption of fuel and to prevent Inadvertent firing, of the boiler except upon the required, demand for heat either for the hot water supply or for the hot water radiators. According to the present invention there is provided a control circuit for a central heating system including a boiler having an electrically actuated firing means, an electrically powered pump and a hot water storage tank, the c - 2 ·46248 incorporating a heating resistance circuit including a room thermostat/and a tank thermostat for the hot water storage tank, the tank thermostat being arranged to electrically connect the room thermostat to the firing means of the boiler when the temperature of the tank is at or above a pre-selected temperature or to electrically connect the firing means of the boiler to a supply of electricity when the temperature of the tank is below the preselected temperature so as to actuate the firing means, the room thermostat, when sensing a pre-determined temperature, being arranged to electrically connect the pump and the tank thermostat to a supply of electricity so as to actuate the pump and, if the tank temperature is at or above the preselected temperature, to actuate the firing meanp of the t boiler.
Reference is now made to the accompanying drawings, in Which:Figure 1 is a schematic block diagram illustrating the circuit according to the present invention.
Figure 2 is a wiring connection diagram of the block diagram illustrated in Figure 1.
Referring firstly to Figure 1 a time clock 1 is provided which is connected to a source of electricity. The time clock is operated by relays and has a three position switch la, a first of the positions being an ’off’ position, a second position being a position in which the timing device operates - 3 46 3 4.8 the switch connection and a third position in which a through way connection for the input electricity to the output terminals is provided thus by-passing the timing switch.
A connection unit 2 is illustrated which is more particularly 5 described with reference to Figure 2. There is also provided a room thermostat 3, a hot water tank thermostat 4, a pump 5 and a boiler 6. The boiler 6 is of such a nature as to be fired on being supplied with electricity. The pump serves to circulate water around the heating system and the tank thermostat is connected to a storage tank for hot water for domestic use within the establishment while the room thermostat is located in a convenient position to determine the ambient temperature in a convenient part of the establishment.
I The connections in the unit 2 are illustrated in Figure 2 and the tank thermostat consists of a change over contact 9-. which may move between a position across contacts 7 or contacts 8. The thermostat 4 is arranged so that at a pre-determined temperature the contact 9 closes contacts 8 and that when the temperature falls contact 9 moves over to close contacts 7.
A by-pass switch 10 is provided which on closure eliminates the functional operation of the tank thermostat. Thus if the tank thermostat breaks down it is possible to by-pass the thermostat and still use the boiler. ; ..- 1 The room thermostat 3 consists of. a change contact 12‘ ί which in the closed position makes the contacts 13 and a by- j i i i 6 3 4 8 pass switch 11 is provided for by-passing the function of the contact 12.
A small heating resistance 14 is provided in the box containing the contact 12 and adjacent the thermal responsive element. This is to provide an anticipatory action of the thermostat 3 when the ambient temperature of the air within the room is almost at desired temperature (within 5 degrees of setting on thermostat) so that the thermostat will switch off.
The ambient air temperature will continue to rise until after heat stored in the hot radiators has been transfered into the air. By incorporating this heating element in the room thermostat, closer control of heating system can be achieved than if no such heating resistor 14 were provided.
Lamps 15 and 16 are in circuit with the tank thermostat 4 and room thermostat 3 / respectively.
In operation the source of electricity from the main passes to the time clock and on the make of the time clock contacts to the thermostats 3 and 4. If there is demand for heat according to the room thermostat 3 then the contact 12 Will close across the contacts 13 and electricity is connected to the pump to start the pump operating and if the water temperature in the tank is at the pre-determined temperature the contact 9 will be across the contact 8 and so an electrical connection is also made to the boiler 6 to fire the boiler. Both lamps 15 and 16 will then be lit indicating that the boiler 6 and pump 5 have been operated. On reaching the desired temperature the room thermostat 3 will open and disconnect electricity to both pump 5 and boiler 6. If there be a demand for more heat in the water storage tank then the contact 3 will change from contact 8 to contact 7 and thereafter electricity will be connected only to the boiler 6 to fire the boiler without starting the pump 5. In this event only the lamp 15 will be lit.
The switch 11 is normally open but should thermostat 3 fail, switch 11 may be closed to by-pass the thermostat thereby enabling the pump to be actuated. ι It is thought that by having a controlled circuit according to the present invention that a saving both in electricity for operating the pump.and more particularly for fuel for firing the boiler is obtained, which also results in less maintenance for the boiler.

Claims (5)

1. A control circuit for a central heating system including a boiler having an electrically actuated firing means, an electrically powered pump and a hot water storage tank, the incorporating a heating resistance circuit including a room thermostat /and a tank thermostat 5 for the hot water storage tank, the tank thermostat being arranged to electrically connect the room thermostat to the firing means of the boiler when the temperature of the tank is at or above a pre-selected temperature or to electrically connect the firing means of the boiler to a supply of elec10 tricity when the temperature of the tank is below the preselected temperature so as to actuate the firing means, the ' room thermostat, when sensing a pre-determined temperature, being arranged to electrically connect the pump and the tank thermostat to a supply of electricity so as to actuate the . 15 pump and, if the tank temperature is at or above the preselected temperature, to actuate the firing means of the boiler. 20
2. A control circuit according to Claim 1 including a time control connected to the tank thermostat and the room thermostat for controlling supply of electricity thereto.
3. · A control circuit according to any of Claims 1 or 2 including visual indication means for indicating actuation . 25 of the pump and/or firing means of the boiler.
4. A control circuit according to any preceding Claim including by-pass switches arranged so as to complete an electric circuit by-passing the thermostats so as to connect directly the firing means and pump to a supply of electricity.
5. 5. a control circuit for a central heating system substantially as described with reference to and as illustrated in the accompanying drawings.
IE153/78A 1977-09-15 1978-01-23 Improvements in electrical electronic control circuits IE46248B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB38494/77A GB1590178A (en) 1977-09-15 1977-09-15 Electrical electronic control circuits

Publications (2)

Publication Number Publication Date
IE780153L IE780153L (en) 1979-03-15
IE46248B1 true IE46248B1 (en) 1983-04-06

Family

ID=10403836

Family Applications (1)

Application Number Title Priority Date Filing Date
IE153/78A IE46248B1 (en) 1977-09-15 1978-01-23 Improvements in electrical electronic control circuits

Country Status (2)

Country Link
GB (1) GB1590178A (en)
IE (1) IE46248B1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8510654D0 (en) * 1985-04-26 1985-06-05 Farley D W Electrical supply system
CN114340427A (en) * 2019-09-05 2022-04-12 日本烟草国际股份有限公司 Heating status indicator and heating method for aerosol generating device

Also Published As

Publication number Publication date
GB1590178A (en) 1981-05-28
IE780153L (en) 1979-03-15

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