Burner control

Claim 2

A burner control system comprising: a. means providing a source of low voltage including a normally closed safety switch, b. a controlling relay element in circuit with the low voltage source, c. a thermostatic switch in circuit with said controlling relay element adapted to close for conditioning the circuit responsive to a call for heat, d. a heater for the safety switch, e. a normally nonconductive electronic switch in circuit with the low voltage source and with the safety switch heater, f. a circuit for triggering said electronic switch in circuit with said low voltage source and said thermostatic switch, g. a light-sensitive flame detector in the triggering circuit for the electronic switch normally providing a relatively high resistance to bias said switch to conduct in the absence of a burner flame when the thermostatic switch is closed, and provide a relatively low resistance in the presence of a burner flame to reversely bias the switch to a nonconductive state when the burner is lighted, and h. an indicator energizable responsive to the triggering circuit for the electronic switch during energization of the safety switch heater.

Claim 3

A burner control system comprising: a. means providing a source of low voltage including a normally closed safety switch, b. a controlling relay element in circuit with the low voltage source, c. a thermostatic switch in circuit with said controlling relay element adapted to close for conditioning the circuit responsive to a call for heat, d. a first normally nonconductive electronic switch in circuit with said controlling relay element and thermostatic switch for energizing said controlling relay element, e. a circuit for triggering said first electronic switch including a second normally nonconductive electronic switch in circuit with the low voltage source, f. a heater for said safety switch in circuit with said second electronic switch, g. a circuit for triggering said second electronic switch in circuit with said low voltage source and said thermostatic switch, h. a light-sensitive flame detector in the triggering circuit for the second electronic switch normally providing a relatively high resistance to bias said second electronic switch to conduct in the absence of a burner flame when the thermostatic switch is closed thereby to energize the safety switch heater and provide a relatively low resistance in the presence of a burner flame to reversely bias the second switch to a nonconductive state when the burner is lighted, thereby to deenergize the heAter, and i. a visible indicator energizeable responsive to the triggering circuit for the second electronic switch during energization of the safety switch heater.

Claim 4

A burner control system comprising: a. means providing a source of low voltage including a normally closed safety switch, b. a controlling relay element in circuit with the low voltage source, c. a thermostatic switch in circuit with said controlling relay element adapted to close for conditioning the circuit responsive to a call for heat, d. a first normally nonconductive electronic switch in circuit with said controlling relay element and thermostatic switch for energizing said controlling relay element, e. a circuit for triggering said first electronic switch including a second normally nonconductive electronic switch in circuit with the low voltage source, f. a heater for said safety switch in circuit with said second electronic switch, g. a circuit for triggering said second electronic switch in circuit with said low voltage source and said thermostatic switch, h. a light-sensitive flame detector in the triggering circuit for the second electronic switch normally providing a relatively high resistance to bias said second electronic switch to conduct in the absence of a burner flame when the thermostatic switch is closed thereby to energize the safety switch heater and provide a relatively low resistance in the presence of a burner flame to reversely bias the second switch to a nonconductive state when the burner is lighted, thereby to deenergize the heAter, and i. a visible indicator energizeable responsive to the triggering circuit for the second electronic switch during energization of the safety switch heater.

Claim 5

A burner control system as defined in claim 2, wherein the visible indicator comprises a light emitting diode.

Claim 6

A burner control system as defined in claim 2, wherein the second electronic switch comprises an asymmetrical switch rendered conductive responsive only to a minimum breakover voltage.

Claim 7

A burner control system as defined in claim 2, wherein the asymmetrical switch comprises a silicon asymmetrical trigger.

Claim 8

A burner control system comprising: a. means providing a source of low voltage including a normally closed safety switch, b. a controlling relay element in circuit with the low voltage source, c. a thermostatic switch in circuit with said controlling relay element adapted to close for conditioning the circuit responsive to a call for heat, d. an asymmetrical switch in circuit with said controlling relay element and thermostatic switch for energizing said controlling relay element responsive to a predetermined breakover voltage, e. an operator for said safety switch, f. a circuit for energizing said operator upon closure of said thermostatic switch, and g. a flame detector in the operator circuit for deenergizing the operator on the establishment of a burner flame.

Claim 9

A burner control system comprising: a. means providing a source of low voltage including a normally closed safety switch, b. a controlling relay element in circuit with the low voltage source, c. a thermostatic switch in circuit with said controlling relay element adapted to close for conditioning the circuit responsive to a call for heat, d. an asymmetrical switch in circuit with said controlling relay element and thermostatic switch for energizing said controlling relay element responsive to a predetermined breakover voltage, e. an operator for said safety switch, f. a circuit for energizing said operator upon closure of said thermostatic switch, and g. a flame detector in the operator circuit for deenergizing the operator on the establishment of a burner flame.

Claim 10

A burner control system comprising: a. means providing a source of low voltage including a normally closed safety switch, b. a controlling relay element in circuit with the low voltage source, c. a thermostatic switch in circuit with said controlling relay element adapted to close for conditioning the circuit responsive to a call for heat, d. a forward breakover switch in circuit with said controlling relay element and thermostatic switch for energizing said controlling relay element responsive only to a predetermined minimum breakover voltage, e. a circuit for triggering said breakover switch including a second normally nonconductive electronic switch in circuit with the low voltage source, f. a heater for said safety switch in circuit with said second electronic switch, g. a circuit for triggering said second electronic switch in circuit with said low voltage source and said thermostatic switch, and h. a light-sensitive flame detector in the triggering circuit for the second electronic switch normally providing a relatively high resistance to bias said second switch to conduct in the absence of a burner flame when the thermostatic switch is closed, and provide a relatively low resistance in the presence of a burner flame to reversely bias the second switch to a nonconductive state when the burner is lighted.

Claim 11

A burner control system comprising: a. means providing a source of low voltage including a normally closed safety switch, b. a controlling relay element in circuit with the low voltage source, c. a thermostatic switch in circuit with said controlling relay element adapted to close for conditioning the circuit responsive to a call for heat, d. a forward breakover switch in circuit with said controlling relay element and thermostatic switch for energizing said controlling relay element responsive only to a predetermined minimum breakover voltage, e. a circuit for triggering said breakover switch including a second normally nonconductive electronic switch in circuit with the low voltage source, f. a heater for said safety switch in circuit with said second electronic switch, g. a circuit for triggering said second electronic switch in circuit with said low voltage source and said thermostatic switch, and h. a light-sensitive flame detector in the triggering circuit for the second electronic switch normally providing a relatively high resistance to bias said second switch to conduct in the absence of a burner flame when the thermostatic switch is closed, and provide a relatively low resistance in the presence of a burner flame to reversely bias the second switch to a nonconductive state when the burner is lighted.

Claim 12

A burner control system as defined in claim 7, wherein the breakover switch comprises a silicon asymmetrical trigger.

Claim 13

A burner control system as defined in claim 7, including an indicator energizable responsive to the triggering circuit for the second electronic switch during energization of the safety switch heater.

Claim 14

A burner control system comprising: a. means providing a line voltage circuit including selectively energizable burner means, b. a first electronic switch in circuit with the burner means including a gate for triggering said switch, c. a light-sensitive element in circuit with the gate for rendering the gate conductive, d. means providing a source of low voltage, e. a light emitting element for transmitting light to said light-sensitive element, f. a thermostat in circuit with said low voltage source and said light emitting element for conditioning the circuit responsive to a call for heat, g. a forward breakover device in the circuit with said light emitting element and thermostat for energizing said light emitting element responsive to a predetermined breakover voltage, h. a third normally nonconductive electronic switch in circuit with the low voltage source for rendering the forward breakover device conductive, i. a circuit for triggering said third electronic switch in circuit with said low voltage source and said thermostat, and j. a light-sensitive flame detecting cell in circuit with the triggering circuit for the third electronic switch normally providing a relatively high resistance to trigger said third switch in the absence of a burner flame when the thermostat is closed, and provide a relatively low resistance in the presence of a burner flame to render the third switch nonconductive when the burner is lighted.

Claim 15

A burner control system comprising: a. means providing a line voltage circuit including selectively energizable burner means, b. a first electronic switch in circuit with the burner means including a gate for triggering said switch, c. a light-sensitive element in circuit with the gate for rendering the gate conductive, d. means providing a source of low voltage, e. a light emitting element for transmitting light to said light-sensitive element, f. a thermostat in circuit with said low voltage source and said light emitting element for conditioning the circuit responsive to a call for heat, g. a forward breakover device in the circuit with said light emitting element and thermostat for energizing said light emitting element responsive to a predetermined breakover voltage, h. a third normally nonconductive electronic switch in circuit with the low voltage source for rendering the forward breakover device conductive, i. a circuit for triggering said third electronic switch in circuit with said low voltage source and said thermostat, and j. a light-sensitive flame detecting cell in circuit with the triggering circuit for the third electronic switch normally providing a relatively high resistance to trigger said third switch in the absence of a burner flame when the thermostat is closed, and provide a relatively low resistance in the presence of a burner flame to render the third switch nonconductive when the burner is lighted.

Claim 16

A burner control system as defined in claim 10, wherein the forward breakover diode comprises a silicon asymmetrical trigger.

Claim 17

A burner control system comprising: a. means providing a line voltage circuit including selectively energizable burner means, b. a first electronic switch in circuit with the burner means including a gate for triggering said switch, c. a light-sensitive element in circuit with the gate for rendering the gate conductive, d. means providing a source of low voltage including a normally closed safety switch, e. a light emitting element for transmitting light to said light-sensitive element, f. a thermostat in circuit with said low voltage source and said light emitting element for conditioning the circuit responsive to a call for heat, g. a second electronic switch in circuit with said light emitting element and thermostat for energizing said light emitting element including a gate for triggering said second electronic switch, h. a third normally nonconductive electronic switch in circuit with the low voltage source for rendering the last recited gate conductive, i. a heater for the safety switch in circuit with the third electronic switch, j. a gate for triggering said third electronic switch in circuit with said low voltage source and said thermostat, k. a light-sensitive flame detecting cell in circuit with the gate for the third electronic switch normally providing a relatively high resistance to trigger said third switch in the absence of a burner flame when the thermostat is closed, and provide a relatively low resistance in the presence of a burner flame to render the third switch nonconductive when the burner is lighted, and l. a visible indicator energizable responsive to the gate circuit for the second electronic switch during conductivity of the third switch.

Claim 18

A burner control system comprising: a. means providing a line voltage circuit including selectively energizable burner means, b. a first electronic switch in circuit with the burner means including a gate for triggering said switch, c. a light-sensitive element in circuit with the gate for rendering the gate conductive, d. means providing a source of low voltage including a normally closed safety switch, e. a light emitting element for transmitting light to said light-sensitive element, f. a thermostat in circuit with said low voltage source and said light emitting element for conditioning the circuit responsive to a call for heat, g. a second electronic switch in circuit with said light emitting element and thermostat for energizing said light emitting element including a gate for triggering said second electronic switch, h. a third normally nonconductive electronic switch in circuit with the low voltage source for rendering the last recited gate conductive, i. a heater for the safety switch in circuit with the third electronic switch, j. a gate for triggering said third electronic switch in circuit with said low voltage source and said thermostat, k. a light-sensitive flame detecting cell in circuit with the gate for the third electronic switch normally providing a relatively high resistance to trigger said third switch in the absence of a burner flame when the thermostat is closed, and provide a relatively low resistance in the presence of a burner flame to render the third switch nonconductive when the burner is lighted, and l. a visible indicator energizable responsive to the gate circuit for the second electronic switch during conductivity of the third switch.

Claim 19

A burner control system comprising: a. means providing a line voltage circuit, b. burner means in the line voltage circuit adapted to be selectively energized, c. a first electronic switch in circuit with the burner means, d. a circuit for triggering said switch including a controlled relay element, e. means providing a source of low voltage including a normally closed safety switch, f. a controlling relay element in circuit with the low voltage source for controlling said controlled relay element, g. a thermostat in circuit with said controlling relay element for conditioning the circuit responsive to a call for heat, h. a forward breakover device in circuit with said controlling relay element and thermostat for energizing said controlling relay element, i. a circuit for triggering said breakover device including a third electronic switch in circuit with the low voltage source, j. a heater for said safety switch in circuit with said third electronic switch, k. a gate circuit for triggering said third electronic switch in circuit with said low voltage source and said thermostat, l. a light-sensitive flame detector in the gate circuit for the third electronic switch normally providing a relatively high resistance to trigger said third switch and the heater in the absence of a burner flame when the thermostat is closed, and provide a relatively low resistance in the presence of a burner flame to render the third switch and the heater nonconductive when the burner iS lighted, and m. a light emitting diode energizable during energization of the third switch.

Claim 20

A burner control system comprising: a. means providing a line voltage circuit, b. burner means in the line voltage circuit adapted to be selectively energized, c. a first electronic switch in circuit with the burner means, d. a circuit for triggering said switch including a controlled relay element, e. means providing a source of low voltage including a normally closed safety switch, f. a controlling relay element in circuit with the low voltage source for controlling said controlled relay element, g. a thermostat in circuit with said controlling relay element for conditioning the circuit responsive to a call for heat, h. a forward breakover device in circuit with said controlling relay element and thermostat for energizing said controlling relay element, i. a circuit for triggering said breakover device including a third electronic switch in circuit with the low voltage source, j. a heater for said safety switch in circuit with said third electronic switch, k. a gate circuit for triggering said third electronic switch in circuit with said low voltage source and said thermostat, l. a light-sensitive flame detector in the gate circuit for the third electronic switch normally providing a relatively high resistance to trigger said third switch and the heater in the absence of a burner flame when the thermostat is closed, and provide a relatively low resistance in the presence of a burner flame to render the third switch and the heater nonconductive when the burner iS lighted, and m. a light emitting diode energizable during energization of the third switch.