US3449055A - Burner control apparatus with prepurge timing - Google Patents

Burner control apparatus with prepurge timing Download PDF

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Publication number
US3449055A
US3449055A US685193A US3449055DA US3449055A US 3449055 A US3449055 A US 3449055A US 685193 A US685193 A US 685193A US 3449055D A US3449055D A US 3449055DA US 3449055 A US3449055 A US 3449055A
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United States
Prior art keywords
relay
burner
flame
switch
capacitor
Prior art date
Legal status (The legal status 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 status listed.)
Expired - Lifetime
Application number
US685193A
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English (en)
Inventor
James C Blackett
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Honeywell Inc
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Honeywell Inc
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Publication date
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    • 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
    • F23N5/123—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 using electronic means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N5/00—Systems for controlling combustion
    • F23N5/20—Systems for controlling combustion with a time programme acting through electrical means, e.g. using time-delay relays
    • F23N5/203—Systems for controlling combustion with a time programme acting through electrical means, e.g. using time-delay relays 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
    • F23N2223/22—Timing network
    • F23N2223/24—Timing network with bimetallic elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2223/00—Signal processing; Details thereof
    • F23N2223/22—Timing network
    • F23N2223/26—Timing network with capacitors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2227/00—Ignition or checking
    • F23N2227/04—Prepurge
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2227/00—Ignition or checking
    • F23N2227/28—Ignition circuits
    • F23N2227/30—Ignition circuits for pilot burners
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2229/00—Flame sensors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2229/00—Flame sensors
    • F23N2229/12—Flame sensors with flame rectification current detecting means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2233/00—Ventilators
    • F23N2233/06—Ventilators at the air intake
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N5/00—Systems for controlling combustion
    • F23N5/18—Systems for controlling combustion using detectors sensitive to rate of flow of air or fuel

Definitions

  • a burner control apparatus having a burner motor relay adapted to energize a burner motor to institute air flow to the burner, a unijunction prepurge timer having a capacitor and a unijunction transistor which are energized when an air flow switch responds to air flow, a main control relay which is energized by the discharge of the capacitor through the unijunction transistor and which is adapted to energize a pilot valve and ignition means, an electronic flame detector having transistors and a flame relay which is adapted to de-energize the ignition and energize a main valve upon the presence of pilot flame, and a bimetal operated safety lockout device which is de-energized upon the presence of pilot flame.
  • Prior art burner control apparatus provide this prepurge function by the use of various timers, including unijunction timers.
  • Unijunction timers have been used generally in many arts to delay the energization of a relay by connecting an R-C circuit to the emitter of the unijunction transistor and then discharging the capacitor through the unijunction emitter to base circuit and the relay winding.
  • the time of firing of the unijunction is determined by the relationship between the emitter voltage (capacitor charge) and the base-to-base voltage.
  • the prepurge timer is usually energized by circuit means including a normally closed switch of the flame relay, to insure that the flame detector is not falsely detecting flame.
  • My invention utilizes an electronic switching element in the form of a transistor to cause the flame relay winding to be energized when the transistor is conductive.
  • the relay armature does not immediately move to its energized state because of inertia.
  • I connect the transistor to the capacitor to discharge the capacitor through the transistor when the transistor is rendered conductive.
  • a fuel burner installation 1 0 includes a burner motor 11, pilot valve 12, ignition means 13, main valve 14, and flame rod 15.
  • the burner installation has been shown in block diagram form, recognizing that such a burner installation may take many specific forms.
  • Flame rod 15 is structurally associated with a pilot burner, not shown, to sense the presence of flame at the pilot burner.
  • the pilot burner is structurally associated with the main burner, not shown, to ignite fuel flowing from the main burner, once a pilot flame has been established at the pilot burner.
  • burner air flow switch 16 This switch is a normally open switch which is constructed and arranged to close in response to air flow initiated by energization of burner motor 11.
  • a controller 17 which likewise may take many forms, is a normally open switch constructed and arranged to close upon a need for operation of the fuel burner installation and to open at the end of a period of such a need.
  • the burner control apparatus of my invention provides prepurge timing by means of a conventional unijunction timer identified generally by means of reference numeral 18. This timer is connected to control the energization of winding 19 of a main control relay identified as relay 1R.
  • Relay 1R includes normally open switches 1R1, 1K3, and 1R4, and a normally closed switch 1R2.
  • Relay 2R includes a winding 21, normally closed switches 2R1 and 2R2, and a normally open switch 2R3.
  • a conventional time delayed safety lockout means 22 may take the form of a self-latching bimetal operated safety switch including a heater 23 which when energized for a time period is effective to cause a bimetal (not shown) to warp to open a normally closed switch 24.
  • a bimetal not shown
  • Relay 3R includes a winding 26 and normally open switches SR1 and SR2.
  • Operating voltage for the fuel burner installation and the burner control apparatus is provided from conductors 27 and 28 which are adapted to be connected to a source of alternating voltage.
  • a transformer 29 has its primary winding 30l connected to conductors 27 and 28.
  • Secondary winding 31 provides a low magnitude alternating voltage to bridge rectiiier 32 to charge capacitor 33 to the polarity indicated.
  • Secondary winding 34 provides a high magnitude AC voltage, one terminal of which is connected to ground at 35 and the other terminal of which is connected through condenser 36 and conductor 37 to flame rod 15.
  • Capacitor 36 is charged only so long as flame is present at the pilot burner and the charge on capacitor 36 passes through a filter network 39 to render transistor 40 nonconductive in the presence of flame. Upon nonconduction of transistor 40, transistors 41, 42 and 43 are rendered conductive.
  • this timer includes a unijunction transistor 44 having an emitter electrode 4S, a first base electrode 46 and a second base electrode 47.
  • a capacitor 48 is connected in circuit with emitter 45 and base 47 of this transistor, through winding 19 of relay 1R.
  • Capacitor 48 and the base-to-base circuit of the unijunction transistor are connected to be energized from DC source 33 through a circuit which includes burner air flow switch 16, switch 2R1 of relay 2R and resistors 49, 50 and 51.
  • unijunction transistor 44 While I have elected to disclose a unijunction transistor 44, it is within the teachings of my invention to use the electrical analogy of this structural element, for example, the two transistor analogy of a unijunction transistor. More broadly, unijunction transistor 44 can be considered to be an electronic switching element having an input and an output, and characterized as a switching element by means of which capacitor 48 will discharge through winding 19 rwhen the voltage on the capacitor exceeds a normally given value, which value-however reduces in magnitude as the voltage applied to the output of the switching element is reduced.
  • controller 17 closes to energize transformer 29.
  • Bridge rectifier 32 charges capacitor 33 and winding 26 of relay 3R is energized through a circuit including the series elements switch 1R2 and heater 23.
  • relay 3R is energized only if relay 1R is de-energized and only if heater 23 has circuit continuity.
  • switch 3R1 Energization of relay 3R closes switch 3R1 to complete a holding circuit. Specifically switch 3R1 shorts the above mentioned series circuit and thereby insures that heater 23 is not energized during the purge period. The closing of switch 3R2 is effective to energize burner motor 11 to institute the flow of air at the fuel burner installation.
  • Air flow switch 16 responds to the ow of air to energize unijunction timer 18. Specifically, the charging of capacitor 48 begins and a base-to-base voltage is applied to unijunction transistor 44. It will be noted that this energizing circuit is through switch 2R1 of flame relay 2R.
  • the prepurge period is instituted. During this time capacitor 48 charges, the upper plate of the capacitor becoming positive. Thus, the voltage level of the emitter is gradually increasing and, in accordance with the well-known characteristics of unijunction transistor 44, after a time delay a voltage will be reached where transistor 44 becomes conductive and capacitor 48 discharges through winding 19 of relay 1R to energize this winding.
  • the energization of winding 19 completes a first maintaining circuit for winding 19 which includes switch 1R3, resistor 53, diode 52, resistor 49 and switch 2R1 of the flame relay.
  • Energization ol winding 19 also closes switch 'IRI to complete an energizing circuit for heater 23.
  • This euergizing circuit also includes resistor 49 and switch 2R1.
  • Relay 1R by way of switch 1R4, is connected in overall control of fuel flow to the fuel burner installation.
  • the closing of switch 1R4 is adapted to energize pilot valve 12 and ignition means 13 to thereby institute a trialfor-pilot-flame period.
  • heater 23 is energized. It is therefore necessary that pilot flame be established and detected by flame detector 20 Within the timing period of safety lockout 22.
  • Conduction of transistor 43 is effective to energize winding 21 of flame relay 2R. Energization of this relay causes switch 2R1 to open, thereby de-energizing heater 23 and opening the circuit to capacitor 48 and unijunction transistor 44. It will also be noted that conduction of transistor 42 is effective to short capacitor 48 through diode 54. However, capacitor 48 at this time has discharged through winding 19 to energize the winding and relay 1R is maintained energized through the above mentioned first maintaining circuit.
  • Conduction of transistor 43 is also effective to complete a second maintaining circuit for winding 19 of relay 1R.
  • This second maintaining circuit extends through diode 55 and resistor 56 to switch 1R3 and then through winding 19.
  • Energization of relay 2R is also effective to open switch 2R2, de-energizing ignition means 13, and to close switch 2R3, energizing main valve 14.
  • the apparatus is now operating in the run period, with burner motor 11, pilot valve 12 and main valve 14 energized. Should a flame failure occur during the run period, transistor 40 is rendered conductive and transistors 41, 42 and 43 are rendered nonconductive. As transistor 43 is rendered nonconductive, the windings of both relays 1R and 2R are deenergized to shut down the fuel burner installation. Relay 3R remains energized and the closing of switch 2R1 is effective to institute a recycle of the control apparatus.
  • the structure of my invention insures that winding 19 of relay 1R will not be energized should an unsafe failure of flame detector 20 occur during the purge period.
  • An unsafe failure of the flame detector is evidenced by energization of relay 2R during the purge period.
  • Energization of this relay during the purge period would open switch 2R1 and this would have the undesirable effect of removing the base-to-base voltage of transistor 44.
  • Capacitor 48 would be charged to some voltage level at this time and with no base-to-base voltage on the unijunction capacitor 48 would discharge through the winding of relay 1R energizing the winding.
  • My invention involves the unique structural relationship of transistor 42 and capacitor 48. Transistor 42 and the manner in which this transistor shorts capacitor 48 through diode 54 insures that this unsafe operation cannot take place. With the construction of my invention, it is not possible for relay switch 2R1 to open before capacitor 48 is shorted. It will be remembered that the energization of winding of flame relay 2R is assumed to occur because of the unsafe failure of flame detector 20. Immediately upon such an unsafe failure, transistor 42 becomes conductive, rendering transistor 43 conductive and energizing winding 21. However, because of the initial properties of the relay, and the failure of the armature to respond immediately to energization of its winding, transistor 42 always becomes conductive before relay switch 2R1 can open.
  • My invention likewise has application to structures utilizing other types of fiame detection, for example, an ultraviolet flame detector wherein an unsafe failure may occur due to a high background count of the Geiger tube detector utilized to sense ultraviolet radiation.
  • My invention is also directed to the structural combination of the use of transistor 42 to short capacitor 48 in combination with the above described structure including the two maintaining circuits for relay 1R, the energizing and holding circuits for relay 3R, and the circuits including heater 23, as will be apparent from the following claims.
  • Burner control apparatus comprising;
  • a flame detector including a first electronic switching element adapted to be rendered conductive upon the presence of flame and means connecting said rst switching element in controlling relation to a flame ⁇ detector control means having a time delay in actuation from a first to a second state upon conduction of said switching element,
  • a prepurge timer having an input including a capacitor connected to the input of a second electronic switching element, the output of said second electronic switching element including said main control means, said second electronic switching element being characterized as one in which the capacitor will discharge through said main control means when the voltage on said capacitor exceeds a given value, which value reduces as the voltage applied to the output of Said second electronic switching element reduces,
  • Burner control apparatus as defined in claim 1 wherein said main control means includes an actuator connected in circuit with the output of said second electronic switching element, and wherein said main control means is actuated from a first to a second state upon energization of said main control means actuator, and having a first maintaining circuit tomaintain energization of said maincontrol means actuator, said first maintaining circuit being controlled by said main control means when in said second state and said detector control means when in said first state.
  • Burner control apparatus as defined in claim 2 having a second maintaining circuit to maintain energization of said main control means actuator, said second maintaining circuit being controlled by said main control means when in said second state and by means connecting said first electronic switching element in controlling relation to said second maintaining circuit.
  • Burner control apparatus as defined in claim 3 having safety lockout means including a time delay actuator and a burner motor control means having an actuator, wherein said motor control means is actuated from a first to a second state upon energization of said motor control means actuator; including initial energizing circuit means to initially energize said motor control means actuator and including in a series circuit said lockout means actuator and said main control means in said first state, holding energizing circuit means for said motor control means actuator including said motor control means in said second state connected to short said series circuit, and energizing circuit means for said lockout means actuator controlled by said main control means in said second state and said detector control means in said first state.
  • Burner control apparatus as defined in claim 4 wherein said burner motor control means is adapted when in said second state to energize the fan of a burner installation, wherein said circuit to energize the output of said second electronic switching element and to charge said capacitor is additionally adapted to -be controlled by a burner air fiow switch, wherein said main control means is adapted when in said second state to energize the pilot valve and ignition means of the burner installation, and wherein said detector control means is adapted when in said second state to energize the main valve of the burner installation.
  • Burner control apparatus as defined in claim 1 wherein said main control means includes an actuator and wherein said second electronic switching element is a unijunction transistor with said capacitor connected to the emitter electrode thereof and with said main control means actuator connected to the base-to-base circuit of said unijunction transistor.
  • Burner control apparatus as defined in claim 6 wherein said main control means is a relay having a winding as the actuator and having switch means actuated from a first to a second state upon energization of said main control relay winding, and wherein said flame detector control means is a flame relay having a Winding which is energized by conduction of said first switching element, and having switch means which is actuated from a first to a second state upon conduction of said first switching element, thetime delay being provided by the inertia property of the relay.
  • said rst electronic switching element is a first transistor whose output electrodes are connected to said capacitor, wherein said means connecting said first transistor in controlling relation to the winding of said flame relay is a second transistor which is rendered conductive by conduction of said first transistor; and including a first maintaining circuit to maintain energization of said main control relay winding, said first maintaining circuit being completed by the switching means of said main control relay when in said second state and the switch means of said flame relay when in said first state; and a second maintaining circuit to maintain energization of said main control relay winding, said second maintaining circuit being completed by the switch means of said main control relay when in said second state and by said second transistor when conductive.
  • Burner control apparatus as dened in claim 8, having safety lockout means including a time delay actuator in the form of a heater, and having a burner motor relay having a winding and switch means which are actuated from a first to a second state upon energization of said winding, and including initial energizing circuit means to energize said motor relay winding and including in a series circuit said heater and the switch means of said main control relay inpsaid first state, holding energizing circuit means for said motor relay winding including the switch means of said motor relay in said second state to short said series circuit, and energizing circuit means for said heater controlled by the switch means of said main control relay in said second state and the switch means of said flame in said first state.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Combustion (AREA)
  • Regulation And Control Of Combustion (AREA)
US685193A 1967-11-22 1967-11-22 Burner control apparatus with prepurge timing Expired - Lifetime US3449055A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US68519367A 1967-11-22 1967-11-22

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US3449055A true US3449055A (en) 1969-06-10

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US685193A Expired - Lifetime US3449055A (en) 1967-11-22 1967-11-22 Burner control apparatus with prepurge timing

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US (1) US3449055A (enrdf_load_stackoverflow)
DE (1) DE1809942A1 (enrdf_load_stackoverflow)
FR (1) FR1592907A (enrdf_load_stackoverflow)
GB (1) GB1250655A (enrdf_load_stackoverflow)
NL (1) NL6816670A (enrdf_load_stackoverflow)
SE (1) SE343671B (enrdf_load_stackoverflow)

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3574495A (en) * 1969-12-11 1971-04-13 Honeywell Inc Burner control system
US3610789A (en) * 1969-09-30 1971-10-05 Eaton Yale & Towne Flame rod safety control system
US3705783A (en) * 1971-07-21 1972-12-12 Honeywell Inc Burner safeguard control apparatus
US3902839A (en) * 1973-12-07 1975-09-02 Johnson Service Co Electronic pilot ignition and flame detection circuit
US3918881A (en) * 1974-03-01 1975-11-11 Johnson Service Co Fuel ignition control arrangement
US4035135A (en) * 1976-02-05 1977-07-12 Honeywell Inc. Postpurge pilot burner sequencing means
FR2348442A1 (fr) * 1976-04-13 1977-11-10 United Gas Industries Ltd Dispositifs de commande electriques pour appareils de chauffage
FR2356083A1 (fr) * 1976-06-21 1978-01-20 Johnson Controls Inc Bruleur a systeme d'allumage du combustible a protection contre les derangements
FR2356082A1 (fr) * 1976-06-21 1978-01-20 Johnson Controls Inc Circuit de commande de systeme d'allumage de combustible produisant des etincelles retardees
US4082493A (en) * 1977-01-19 1978-04-04 Cam-Stat Incorporated Gas burner control system
US4087045A (en) * 1976-09-27 1978-05-02 Johnson Controls, Inc. Stack damper control safety interlock with lockout prevention
DE2809843A1 (de) * 1977-03-07 1978-09-14 Johnson Controls Inc Steueranordnung fuer eine brennstoffzuendanlage
US4137035A (en) * 1977-02-16 1979-01-30 Electronics Corporation Of America Burner control apparatus
US4189296A (en) * 1978-03-13 1980-02-19 Johnson Controls, Inc. Method and apparatus for controlling furnace
US4226581A (en) * 1978-12-22 1980-10-07 Honeywell Inc. Safe start check circuit
US4243372A (en) * 1979-02-05 1981-01-06 Electronics Corporation Of America Burner control system
US4319873A (en) * 1979-04-12 1982-03-16 American Stabilis, Inc. Flame detection and proof control device
US4395224A (en) * 1979-02-05 1983-07-26 Electronics Corporation Of America Burner control system
US4459099A (en) * 1981-09-28 1984-07-10 Allied Corporation Fuel and ignition control
US4906177A (en) * 1989-01-03 1990-03-06 R. E. Phelon Company, Inc. Electronic controller for fluid fuel burner

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2839132A (en) * 1957-03-04 1958-06-17 Honeywell Regulator Co Burner control apparatus
US3263730A (en) * 1964-09-04 1966-08-02 Electronics Corp America Control apparatus
US3270799A (en) * 1964-12-07 1966-09-06 Honeywell Inc Burner control apparatus
US3376099A (en) * 1966-03-30 1968-04-02 Electronics Corp America Electrical control circuitry for burners
US3393037A (en) * 1966-12-07 1968-07-16 Electronics Corp America Combustion control system

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2839132A (en) * 1957-03-04 1958-06-17 Honeywell Regulator Co Burner control apparatus
US3263730A (en) * 1964-09-04 1966-08-02 Electronics Corp America Control apparatus
US3270799A (en) * 1964-12-07 1966-09-06 Honeywell Inc Burner control apparatus
US3376099A (en) * 1966-03-30 1968-04-02 Electronics Corp America Electrical control circuitry for burners
US3393037A (en) * 1966-12-07 1968-07-16 Electronics Corp America Combustion control system

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3610789A (en) * 1969-09-30 1971-10-05 Eaton Yale & Towne Flame rod safety control system
US3574495A (en) * 1969-12-11 1971-04-13 Honeywell Inc Burner control system
US3705783A (en) * 1971-07-21 1972-12-12 Honeywell Inc Burner safeguard control apparatus
US3902839A (en) * 1973-12-07 1975-09-02 Johnson Service Co Electronic pilot ignition and flame detection circuit
US3918881A (en) * 1974-03-01 1975-11-11 Johnson Service Co Fuel ignition control arrangement
US4035135A (en) * 1976-02-05 1977-07-12 Honeywell Inc. Postpurge pilot burner sequencing means
FR2348442A1 (fr) * 1976-04-13 1977-11-10 United Gas Industries Ltd Dispositifs de commande electriques pour appareils de chauffage
US4180380A (en) * 1976-04-13 1979-12-25 United Gas Industries Limited Electrical controls for heating appliances
FR2356083A1 (fr) * 1976-06-21 1978-01-20 Johnson Controls Inc Bruleur a systeme d'allumage du combustible a protection contre les derangements
FR2356082A1 (fr) * 1976-06-21 1978-01-20 Johnson Controls Inc Circuit de commande de systeme d'allumage de combustible produisant des etincelles retardees
US4087045A (en) * 1976-09-27 1978-05-02 Johnson Controls, Inc. Stack damper control safety interlock with lockout prevention
US4082493A (en) * 1977-01-19 1978-04-04 Cam-Stat Incorporated Gas burner control system
US4137035A (en) * 1977-02-16 1979-01-30 Electronics Corporation Of America Burner control apparatus
DE2809843A1 (de) * 1977-03-07 1978-09-14 Johnson Controls Inc Steueranordnung fuer eine brennstoffzuendanlage
US4189296A (en) * 1978-03-13 1980-02-19 Johnson Controls, Inc. Method and apparatus for controlling furnace
US4226581A (en) * 1978-12-22 1980-10-07 Honeywell Inc. Safe start check circuit
US4243372A (en) * 1979-02-05 1981-01-06 Electronics Corporation Of America Burner control system
US4395224A (en) * 1979-02-05 1983-07-26 Electronics Corporation Of America Burner control system
US4319873A (en) * 1979-04-12 1982-03-16 American Stabilis, Inc. Flame detection and proof control device
US4459099A (en) * 1981-09-28 1984-07-10 Allied Corporation Fuel and ignition control
US4906177A (en) * 1989-01-03 1990-03-06 R. E. Phelon Company, Inc. Electronic controller for fluid fuel burner
EP0377490A3 (en) * 1989-01-03 1991-02-06 R.E. Phelon Company Inc. Electronic controller for fluid fuel burner

Also Published As

Publication number Publication date
GB1250655A (enrdf_load_stackoverflow) 1971-10-20
NL6816670A (enrdf_load_stackoverflow) 1969-05-27
FR1592907A (enrdf_load_stackoverflow) 1970-05-19
SE343671B (enrdf_load_stackoverflow) 1972-03-13
DE1809942A1 (de) 1969-10-09

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