Purge timer for burner control system

Details Purge timer for burner control system Purge timer for burner control system

1974-11-29

1976-10-19

Moose, Harry

Combustion

Heated line section feeds flame holder

Unheated oxidizer supply to line between heated section and...

431 29, H01H 4718

Patent

active

039873463

ABSTRACT:
Disclosed herein is a fuel burner control system with a purge timer having a current responsive control relay that is energized into an active state only by a given minimum input current level but can be maintained in that active state by a substantially lesser input current level. After connection to an electrical supply an activating circuit supplies the given input current level to the control relay only after a predetermined purge time period established by an electrical timer, after which a hold circuit supplies the lesser input current level maintaining the relay in its active state. A blower dissipates any residual fuel vapor in the vicinity of the burner during the purge period and only after its conclusion is fuel flow initiated and ignition attempted in response to contact closures effected in the relay's active state. In a preferred embodiment of the invention, the purge timer comprises an energy storage capacitor which is charged from the supply during the purge period after which a threshold device dumps the energy stored in the capacitor to produce the current level required to move the control relay into its active state.

REFERENCES:
patent: 2347714 (1944-05-01), Sorensen
patent: 3393037 (1968-07-01), Giuffrida et al.

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