Combustion – Timer – programmer – retarder or condition responsive control – By sensing of gas leakage – flashback or escaped flame
Patent
1995-07-07
1996-10-22
Lopez, F. Daniel
Combustion
Timer, programmer, retarder or condition responsive control
By sensing of gas leakage, flashback or escaped flame
431 16, 110190, 337404, F23N 510, H01H 3776
Patent
active
055671438
ABSTRACT:
Flue-draft-malfunction detector and shut-off control for oil burner furnaces automatically stops operation of the oil burner in event of flue draft malfunction and prevents further running operation of the oil burner until a meltable element in the control is replaced by an intact element. The control casing has a passageway with an inlet on its front end and at least one outlet. The control is mountable on a furnace with the inlet communicating with the furnace combustion chamber. The meltable element is removably positioned within the casing for exposure to the passageway. Two electrical conductors extend from opposite ends of the element and serve as leads connectable in circuit across two terminals of a primary oil burner control so the element completes a circuit between these terminals. Flue draft malfunction causes positive pressure in the combustion chamber during running of the burner, thereby forcing hot combustion gasses to flow from the combustion chamber through the passageway and out into ambient air. The element does not melt from a start-up puff but will melt from persisting flow of hot gases flowing through the passageway exceeding a predetermined temperature level, thereby interrupting the circuit for immediately stopping the burner. Since the melted open-circuit element advantageously prevents restarting continuing normal running operation of a burner in a furnace having a malfunctioning flue draft, a mechanic will be called who will fix the flue draft and replace the melted element for enabling restarting normal burner operation.
REFERENCES:
patent: 2130175 (1938-09-01), Betz et al.
patent: 3304396 (1967-02-01), Hasson
patent: 3740688 (1973-06-01), McIntosh et al.
patent: 4089632 (1978-05-01), Rexroad
patent: 4204833 (1980-05-01), Kmetz et al.
patent: 4281309 (1981-07-01), Olson
Lee Michael S.
Lopez F. Daniel
Parmelee G. Kendall
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