WO1999026209A1 - An electronic device for the remote control, in real time, for boilers and similar - Google Patents

An electronic device for the remote control, in real time, for boilers and similar Download PDF

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Publication number
WO1999026209A1
WO1999026209A1 PCT/IT1997/000280 IT9700280W WO9926209A1 WO 1999026209 A1 WO1999026209 A1 WO 1999026209A1 IT 9700280 W IT9700280 W IT 9700280W WO 9926209 A1 WO9926209 A1 WO 9926209A1
Authority
WO
WIPO (PCT)
Prior art keywords
relay
outlet
tension
boiler
pin
Prior art date
Application number
PCT/IT1997/000280
Other languages
French (fr)
Inventor
Francesco Longobardi
Original Assignee
Francesco Longobardi
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 Francesco Longobardi filed Critical Francesco Longobardi
Priority to PCT/IT1997/000280 priority Critical patent/WO1999026209A1/en
Publication of WO1999026209A1 publication Critical patent/WO1999026209A1/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M11/00—Telephonic communication systems specially adapted for combination with other electrical systems
    • H04M11/007—Telephonic communication systems specially adapted for combination with other electrical systems with remote control systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N5/00—Systems for controlling combustion
    • F23N5/24—Preventing development of abnormal or undesired conditions, i.e. safety arrangements
    • F23N5/242—Preventing development of abnormal or undesired conditions, i.e. safety arrangements using electronic means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2223/00—Signal processing; Details thereof
    • F23N2223/08—Microprocessor; Microcomputer
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2223/00—Signal processing; Details thereof
    • F23N2223/38—Remote control
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2225/00—Measuring
    • F23N2225/04—Measuring pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2225/00—Measuring
    • F23N2225/08—Measuring temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2225/00—Measuring
    • F23N2225/08—Measuring temperature
    • F23N2225/10—Measuring temperature stack temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2235/00—Valves, nozzles or pumps
    • F23N2235/12—Fuel valves
    • F23N2235/16—Fuel valves variable flow or proportional valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N5/00—Systems for controlling combustion
    • F23N5/02—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium
    • F23N5/12—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using ionisation-sensitive elements, i.e. flame rods

Definitions

  • the present invention concerns an electronic device for the remote control, in real time, for boilers and similar, for the recording of the condition of all sensors working on said boiler, transforming the analogic signals into digital ones and sent on a telephone line.
  • Vv i i lC vv i V as to allow an intervention with already the required spare parts.
  • the aim set forth is reached by means of the electronic device according to the present invention, connected to the boiler or similar, in which sensors are provided for the control of the condition of the different functions thereof, like fumes, pressures, temperature and other, so that the relative analogic signals are transformed into digital signale and, by means of a microprocessor system, said signals are codified, for allowing the identification of the examined detail, converted into multiplet and in serial transmission standard and then sent onto a telephone line through modem.
  • a personal computer is connected, downstream of the line, through a modem; said pc enables the technician, due to a software with an access code, to test all sensors allowing to diagnose the problem and therefore to intervene with the user, being already equipped with all material needed for the possible repairing.
  • the device according to the present invention may allow also to perform a periodic remote servicing for the con- trol of the boiler's condition, a process that before compelled the technician to an intervention in loco;
  • a further use consists in the remote first aid, i.e. the realization of urgency interventions: infact, by means of a quick control of the boiler, the technician may intervene at the right moment, suggesting the user the procedure for immediately blocking the boiler, verifying this all in real time;
  • the device according to the present invention allows the technician to monitorize some parts of the boiler, in case of irregular breakdown tipologies, or simply for checking the good working of some particular devices.
  • Figure 1 shows a block scheme of an electronic remote control device ⁇ in real time, for boilers and similar according to the present invention.
  • FIG. 2 shows the scheme of the feeding component.
  • Figures 3, 4, 5, 6, 7, 8, 9, 10, 1 1 , 12, 1 3, 14, 1 5, 16, 1 7 and 18 show the schemes of the different working relays.
  • Figures 1 9, 20, 21 , 22 and 23 show the schemes of possible additional functions.
  • the enclosed figures show an electronic remote control device, in real time, for boilers and similar in which, in case of breakdown of one of the elements of said boiler C, a relative sensor connected thereto determines the activation of the correspondent relay arranged on said device, producing an appropriate signal which, through an outlet connector, reaches a processor system P where it will be codified and, via serial interface I, transmitted via modem M to th e monitoring centre, consisting of a plurality of insulated devices, like relays, from the conversion from analogic into digital, corresponding to t h e sensors provided in the boilers according to the following scheme:
  • - relay 2 a differential pressure switch
  • - relay 3 a water flowmeter
  • - relay 6 a sanitary feeler
  • - relay 7 a primary exchanger
  • - relay 8 a secondary exchanger
  • - relay 9 a gas modulating valve.
  • TR1 is interdicted, the relay 1 is deenergized and a logic level 1 is present at the outlet;
  • the corresponding outlet now activates the processor device T which, after having codified the signal, sends the same to the modem for the telematic transmission.
  • the maximum temperature thermostat sends a 220 Vac tension to relay 1 8 which gets excited and sends a logic state 0 to the outlet.
  • the outlet activates the processor that codifies the signal and makes it ready for the telematic transmission via modem.
  • the interface connections are provided as follows:
  • the terminals 1 and 2 are connected to the fume feeler, to which correspond outlets 1 1 and 1 ;
  • the terminals 3 and 4 are connected to t h e differential pressure switch, to which correspond outlets 1 3 and 14;
  • the terminals 5 and 6 are connected to the water flowmeter, to which correspond the outlets 1 5 and - the terminals 7 and 8 are connected to the flame ionization, to which correspond the outlets 1 7 and 1 8;
  • the terminals 9 and 10 are connected to the 220 Vac network;
  • the terminals 1 9 and 20 are connected to the thermic feeler NTC, to which correspod the outlets 27 and 28;
  • the terminals 21 and 22 are connected to the sanitary feeler NTC, to which correspond the outlets 29 and 30;
  • the terminals 23 and 24 are connected to the primary exchanger, to which correspond the outlets 31 and 32;
  • the terminals 25 and 26 are connected to the secondary exchanger, to which correspond the outlets 33 and 34;
  • the terminals 35 and 36 are connected to the gas modulating valve, to which correspond the outlets 43 and 44;
  • the terminals 67 and 68 are connected to the water pump, to which correspond the outlets 77 and 78;
  • the terminals 69 and 70 are connected to the maximum temperature thermostat, to which correspond the outlets 79 and 80; - the terminals 71 and 72 are connected to the fume pressure switch, to which correspond the outlets 83 and 84;
  • the terminals 75 and 76 are connected to the gas valve operator, to which correspond the outlets 85 and 86.
  • the terminals left may be used for future expansions, according to the kind of boiler into which theinterface has been inserted.
  • the electric scheme of a variant of the device according to the present invention shows an interface fed with a network tension of 220 Vac which, by means of a fuse Fl , reaches the primary of T1 .
  • the outlet tension of the secondary of T1 is of only 7.5 Vac and when it reaches the rectifier bridge P1 , it is made pulsating at 100Hz and brought to 10 Vcc.
  • the condenser C1 is a levelling electrolyte that makes the outlet tension from the bridge continuous and furthermore reduces to the minimum the buzzing of the alternate current.
  • the integrated ICl is a fix tension regulator that brings its outlet up to 6V.
  • the final condition of the comparator consists of a Bjt with a fluctuating, i.e. non polrized, collector.
  • R5 inserted between the outlet of IC2 and the feeding, is a limiting current resistance which appropriately polarizes the outlet of the integrated and that has the task of bringing the outlet potential to Vcc when the end transistor is i nterdi cted (VrH>VrL).
  • C3 is a polyester condenser and has the task o f controlling possible feeding problems to integrated IC2.
  • the resistance R8 keeps the outlet of the relay contacts at its value when the relay is not excited.
  • the relay 1 has the task of keeping the inverter pin of IC2 at 0, when no alarm situation is signalled at the inlet.
  • the diod in parallel to the relay coil is a protection to the same.

Abstract

The electronic remote control device, in real time, for boilers and similar according to the present invention is connected to a boiler (C) or similar, in which sensors are provided for the control of the condition of the different functions thereof, like fumes, pressures, temperature and other, so that the relative analogic signals are transformed into digital signals and, by means of a microprocessor system (P), said signals are codified, for allowing the identification of the examined detail, converted into multiplet and in serial transmission standard and then sent onto a telephone line through a modem (M).

Description

"AN ELECTRONIC DEVICE FOR THE REMOTE CONTROL, IN REAL TIME, FOR BOILERS AND SIMILAR"
The present invention concerns an electronic device for the remote control, in real time, for boilers and similar, for the recording of the condition of all sensors working on said boiler, transforming the analogic signals into digital ones and sent on a telephone line.
The problem of maintenance of boilers is well known: oftenly, the previous availability of spare parts is required for any case of breakdowns, which can not be all transported by the operators. Consequently, often the interventions of the operators are double with an increase of the costs: one for the recording of the possible damage and the other one for the transport of the required spare parts and for the intervention.
It is the aim of the present invention to completely solve above mentioned requirement by means of a device that can supply at distance, and through a telephone line, the exact information concerning
Vv i i lC vv i
Figure imgf000003_0001
, V as to allow an intervention with already the required spare parts. The aim set forth is reached by means of the electronic device according to the present invention, connected to the boiler or similar, in which sensors are provided for the control of the condition of the different functions thereof, like fumes, pressures, temperature and other, so that the relative analogic signals are transformed into digital signale and, by means of a microprocessor system, said signals are codified, for allowing the identification of the examined detail, converted into multiplet and in serial transmission standard and then sent onto a telephone line through modem.
A personal computer is connected, downstream of the line, through a modem; said pc enables the technician, due to a software with an access code, to test all sensors allowing to diagnose the problem and therefore to intervene with the user, being already equipped with all material needed for the possible repairing.
The versatility of the device according to the present invention and its advantages may be described as follows:
- beyond the described primary function, the device according to the present invention may allow also to perform a periodic remote servicing for the con- trol of the boiler's condition, a process that before compelled the technician to an intervention in loco;
- a further use consists in the remote first aid, i.e. the realization of urgency interventions: infact, by means of a quick control of the boiler, the technician may intervene at the right moment, suggesting the user the procedure for immediately blocking the boiler, verifying this all in real time;
- furthermore, the device according to the present invention allows the technician to monitorize some parts of the boiler, in case of irregular breakdown tipologies, or simply for checking the good working of some particular devices.
The present invention will be explained more in detail hereinbelow relating to the enclosed drawings, in which an embodiment is shown.
Figure 1 shows a block scheme of an electronic remote control device^ in real time, for boilers and similar according to the present invention.
Figure 2 shows the scheme of the feeding component.
Figures 3, 4, 5, 6, 7, 8, 9, 10, 1 1 , 12, 1 3, 14, 1 5, 16, 1 7 and 18 show the schemes of the different working relays. Figures 1 9, 20, 21 , 22 and 23 show the schemes of possible additional functions.
The enclosed figures show an electronic remote control device, in real time, for boilers and similar in which, in case of breakdown of one of the elements of said boiler C, a relative sensor connected thereto determines the activation of the correspondent relay arranged on said device, producing an appropriate signal which, through an outlet connector, reaches a processor system P where it will be codified and, via serial interface I, transmitted via modem M to th e monitoring centre, consisting of a plurality of insulated devices, like relays, from the conversion from analogic into digital, corresponding to t h e sensors provided in the boilers according to the following scheme:
- relay 1 : a fume feeler;
- relay 2: a differential pressure switch;
- relay 3: a water flowmeter;
- relay 4: a flame ionization;
- relay 5: a thermic feeler;
- relay 6: a sanitary feeler;
- relay 7: a primary exchanger;
- relay 8: a secondary exchanger;
- relay 9: a gas modulating valve. The working of the low-tension component of the device according to the present invention may be described as follows:
- when the working of the boiler is regular the fume led is off and does not send any tension to an IC2 pin 10, as the potential of pin 1 1 (VrH) is greater than the one present on said pin 10, which is 0V, and the outlet of IC2 is at its high value, i.e. Vcc=6V;
- consequently, the base of TR1 is polarized and therefore the transistor is conducing, the relay 1 is excited and at the outlet a logic level 0 is recorded;
- when a bad combustion takes place in the boiler, the fumes' led gets on and by doing so it sends a tension to said pin 10 sufficient to make the potential of said pin greater than VrH and therefore, as the situation is turned over, the outlet of IC2 becomes 0V;
- now the base of TR1 is no longer polarized, TR1 is interdicted, the relay 1 is deenergized and a logic level 1 is present at the outlet;
- the corresponding outlet now activates the processor device T which, after having codified the signal, sends the same to the modem for the telematic transmission. For what concerns the component of the high-tension device, during the regular functioning of the boiler C, the maximum temperature thermostat sends a 220 Vac tension to relay 1 8 which gets excited and sends a logic state 0 to the outlet.
At that same moment in which the maximum temperature thermostat intervenes, it doesn't send any longer excitation tension to relay 1 8 which, getting deenergized, sends a logic state 1 to the outlet.
In a similar manner, the outlet activates the processor that codifies the signal and makes it ready for the telematic transmission via modem.
According to the present invention, the interface connections are provided as follows:
- the terminals 1 and 2 are connected to the fume feeler, to which correspond outlets 1 1 and 1 ;
- the terminals 3 and 4 are connected to t h e differential pressure switch, to which correspond outlets 1 3 and 14;
- the terminals 5 and 6 are connected to the water flowmeter, to which correspond the outlets 1 5 and - the terminals 7 and 8 are connected to the flame ionization, to which correspond the outlets 1 7 and 1 8;
- the terminals 9 and 10 are connected to the 220 Vac network;
- the terminals 1 9 and 20 are connected to the thermic feeler NTC, to which correspod the outlets 27 and 28;
- the terminals 21 and 22 are connected to the sanitary feeler NTC, to which correspond the outlets 29 and 30;
- the terminals 23 and 24 are connected to the primary exchanger, to which correspond the outlets 31 and 32;
- the terminals 25 and 26 are connected to the secondary exchanger, to which correspond the outlets 33 and 34;
- the terminals 35 and 36 are connected to the gas modulating valve, to which correspond the outlets 43 and 44;
- the terminals 67 and 68 are connected to the water pump, to which correspond the outlets 77 and 78;
- the terminals 69 and 70 are connected to the maximum temperature thermostat, to which correspond the outlets 79 and 80; - the terminals 71 and 72 are connected to the fume pressure switch, to which correspond the outlets 83 and 84;
- the terminals 75 and 76 are connected to the gas valve operator, to which correspond the outlets 85 and 86.
The terminals left may be used for future expansions, according to the kind of boiler into which theinterface has been inserted.
The electric scheme of a variant of the device according to the present invention shows an interface fed with a network tension of 220 Vac which, by means of a fuse Fl , reaches the primary of T1 .
The outlet tension of the secondary of T1 is of only 7.5 Vac and when it reaches the rectifier bridge P1 , it is made pulsating at 100Hz and brought to 10 Vcc.
This increase is due to the fact that the bridge consists of four diods and has therefore four threshold tensions (from 0.6 to 0.8 V) which are to be added to the inlet tension.
The condenser C1 is a levelling electrolyte that makes the outlet tension from the bridge continuous and furthermore reduces to the minimum the buzzing of the alternate current.
The integrated ICl is a fix tension regulator that brings its outlet up to 6V.
As already mentioned, about 10 Vcc get to the inlet terminal of said integrated IC; the terminal GND is put to earth and the outlet terminal feeds the circuit below, as can be seen from the scheme.
The integrated IC2 is an open collector comparator, used as a inverting Schmitt Trigger; R2, R3, R4 appropriately polarize the non inverting inlet of IC2, where a VrH = (VccR4R3+VoR2R4) / R4R3+R2R4+R2R3 for VCC=Vo=6V is established, and a VeL=(VccR4R3/R4R3+R2R4+R2R3 ) for Vo=0 and Vcc=0=6V.
The final condition of the comparator consists of a Bjt with a fluctuating, i.e. non polrized, collector.
R5, inserted between the outlet of IC2 and the feeding, is a limiting curent resistance which appropriately polarizes the outlet of the integrated and that has the task of bringing the outlet potential to Vcc when the end transistor is i nterdi cted (VrH>VrL).
C3 is a polyester condenser and has the task o f controlling possible feeding problems to integrated IC2.
The resistances R6 and R7, together with the Bjt, form a power condition that guides the relay 1 .
The resistance R8 keeps the outlet of the relay contacts at its value when the relay is not excited.
The relay 1 has the task of keeping the inverter pin of IC2 at 0, when no alarm situation is signalled at the inlet.
The diod in parallel to the relay coil is a protection to the same.

Claims

1 . An electronic remote control device, in real time, for boilers and similar, in which, in case of breakdown of one of the elements of said boiler (C), a relative sensor connected thereto determines the activation of the correspondent relay arranged on said device, producing an appropriate signal which, through an outlet connector, reaches a processor system (P) where it will be codified and, via serial interface (I), transmitted via modem (M) to the monitoring centre, consisting of a plurality of insulated devices, like relays, from the conversion from analogic into digital, corresponding to the sensors provided in the boilers according to the following scheme:
- relay (1 ): a fume feeler;
- relay (2): a differential pressure switch;
- relay (3): a water flowmeter;
- relay (4): a flame ionization;
- relay (5): a thermic feeler;
- relay (6): a sanitary feeler;
- relay (7): a primary exchanger;
- relay (8): a secondary exchanger;
- relay (9): a gas modulating valve.
2. An electronic remote control device according to claim 1 , characterized in the low tension working: - when the working of the boiler is regular the fume led is off and does not send any tension to an IC2 pin ( 1 0), as the potential of pin ( 1 1 ) (VrH) is greater than the one present on said pin ( 10), which is 0V, and the outlet of IC2 is at its high value, i.e. Vcc=6V;
- consequently, the base of TR1 is polarized and therefore the transistor is conducing, the relay ( 1 ) is excited and at the outlet a logic level 0 is recorded;
- when a bad combustion takes place in the boiler, the fumes' led gets on and by doing so it sends a tension to said pin ( 1 0) sufficient to make the potential of said pin greater than VrH and therefore, as the situation is turned over, the outlet of IC2 becomes 0V;
- now the base of TR1 is no longer polarized, TR 1 is interdicted, the relay ( 1 ) is deenergized and a logic level 1 is present at the outlet;
- the corresponding outlet now activates the processor device (T) which, after having codified the signal, sends the same to the modem for the telematic transmission.
3. An electronic remote control device according to claim 1 , characterized by a high-tension working in which, during the regular functioning of the boiler (C), the maximum temperature thermostat sends a 220 Vac tension to relay (18) which gets excited and sends a logic state 0 to the outlet; at that same moment in which the maximum t e m p e ra t u re thermostat intervenes, it doesn't send any longer excitation tension to relay (1 8) which, getti ng deenergized, sends a logic state 1 to the outlet, and in a similar manner the outlet activates the processor that codifies the signal and makes it ready for the telematic transmission via modem.
PCT/IT1997/000280 1997-11-17 1997-11-17 An electronic device for the remote control, in real time, for boilers and similar WO1999026209A1 (en)

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Application Number Priority Date Filing Date Title
PCT/IT1997/000280 WO1999026209A1 (en) 1997-11-17 1997-11-17 An electronic device for the remote control, in real time, for boilers and similar

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/IT1997/000280 WO1999026209A1 (en) 1997-11-17 1997-11-17 An electronic device for the remote control, in real time, for boilers and similar

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2387257A (en) * 2002-04-05 2003-10-08 Garry Lewis Safety apparatus
NL1021829C2 (en) * 2002-11-04 2004-05-07 Nedap Nv Marketing and management information generating system for e.g. domestic boilers, uses observation device with event memory to record changes in state of appliance

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2585809A1 (en) * 1985-08-02 1987-02-06 Paulard Christian Room-heating monitoring device
EP0264311A1 (en) * 1986-09-16 1988-04-20 ELF FRANCE, Société Anonyme dite: Method for the transmission of measurement data information, and apparatus for carrying out the method
JPH01155799A (en) * 1987-12-12 1989-06-19 Miura Co Ltd Data communication system for management of thermal equipment such as boiler
US4887291A (en) * 1987-07-23 1989-12-12 American Monitoring Systems, Inc. System for annunciating emergencies
EP0378465A1 (en) * 1989-01-09 1990-07-18 AEROSPATIALE Société Nationale Industrielle Modular surveillance system for industrial installations
CH676398A5 (en) * 1989-08-30 1991-01-15 Landis & Gyr Betriebs Ag Cordless transmission system for information between equipment - uses remote transmission between items in building and telephone network
WO1991015716A1 (en) * 1990-04-04 1991-10-17 Michel Van Gorp Security system for a combustion heating installation
JPH0462302A (en) * 1990-06-29 1992-02-27 Kurita Water Ind Ltd Data communication system for thermal apparatus
JPH06105002A (en) * 1992-09-21 1994-04-15 Miura Co Ltd Data communication system for managing thermal equipment such as boiler
GB2278463A (en) * 1993-05-24 1994-11-30 British Gas Plc Central heating control system

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2585809A1 (en) * 1985-08-02 1987-02-06 Paulard Christian Room-heating monitoring device
EP0264311A1 (en) * 1986-09-16 1988-04-20 ELF FRANCE, Société Anonyme dite: Method for the transmission of measurement data information, and apparatus for carrying out the method
US4887291A (en) * 1987-07-23 1989-12-12 American Monitoring Systems, Inc. System for annunciating emergencies
JPH01155799A (en) * 1987-12-12 1989-06-19 Miura Co Ltd Data communication system for management of thermal equipment such as boiler
EP0378465A1 (en) * 1989-01-09 1990-07-18 AEROSPATIALE Société Nationale Industrielle Modular surveillance system for industrial installations
CH676398A5 (en) * 1989-08-30 1991-01-15 Landis & Gyr Betriebs Ag Cordless transmission system for information between equipment - uses remote transmission between items in building and telephone network
WO1991015716A1 (en) * 1990-04-04 1991-10-17 Michel Van Gorp Security system for a combustion heating installation
JPH0462302A (en) * 1990-06-29 1992-02-27 Kurita Water Ind Ltd Data communication system for thermal apparatus
JPH06105002A (en) * 1992-09-21 1994-04-15 Miura Co Ltd Data communication system for managing thermal equipment such as boiler
GB2278463A (en) * 1993-05-24 1994-11-30 British Gas Plc Central heating control system

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* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 13, no. 421 (E - 822) 19 September 1989 (1989-09-19) *
PATENT ABSTRACTS OF JAPAN vol. 16, no. 258 (M - 1264) 11 June 1992 (1992-06-11) *
PATENT ABSTRACTS OF JAPAN vol. 18, no. 375 (E - 1578) 14 July 1994 (1994-07-14) *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2387257A (en) * 2002-04-05 2003-10-08 Garry Lewis Safety apparatus
NL1021829C2 (en) * 2002-11-04 2004-05-07 Nedap Nv Marketing and management information generating system for e.g. domestic boilers, uses observation device with event memory to record changes in state of appliance

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