Safe start check circuit

Details Safe start check circuit Safe start check circuit

1978-12-22

1980-10-07

Moy, Joseph Man-Fu

Combustion

Timer, programmer, retarder or condition responsive control

With test circuit checking or analyzing flame sensing...

431 24, 431 73, 431 74, F23Q 2300

Patent

active

042265819

ABSTRACT:
A safe start check circuit for a fuel burner is disclosed. Two relays are arranged to insure proper start and to protect against component failure. Delays in operating the relays, and a normally closed control relay contact serve to both prevent relay races and provide protection against a solid state switch means failure.

REFERENCES:
patent: 3277946 (1966-10-01), Forbes
patent: 3306339 (1967-02-01), Barton et al.
patent: 3376099 (1968-04-01), Giuffrida et al.
patent: 3395968 (1968-08-01), Mobarry et al.
patent: 3449055 (1969-06-01), Blackett
patent: 3504993 (1970-04-01), Cade
patent: 3574495 (1971-04-01), Landis
patent: 3644074 (1972-02-01), Cade
patent: 3830619 (1974-08-01), Cade
patent: 4077762 (1978-03-01), Matthews
patent: 4111639 (1978-09-01), Matthews
Catalog Sheet 60-2034-2, revised 9-75, Honeywell RA890F Flame Safeguard Primary Control.

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