Hot surface ignition system for a gas furnace and method of maki

Details Hot surface ignition system for a gas furnace and method of maki Hot surface ignition system for a gas furnace and method of maki

1986-07-18

1987-12-08

Dority, Jr., Carroll B.

Combustion

Timer, programmer, retarder or condition responsive control

Control of purger, of scavenger or of combustion start-up...

431 29, 431 70, 431 71, F23N 500

Patent

active

047116285

ABSTRACT:
A hot surface ignition system for a gas furnace and method of making the same are provided, the system comprising a high voltage circuit for being connected to a source of high voltage AC current, the high voltage circuit having a hot surface igniter therein and disposed in the path of gas issuing from a burner that is adapted to be fed gas from a source thereof through an electrically operated gas valve, a low voltage circuit for being connected to a source of low voltage AC current, the low voltage circuit having the gas valve therein and having a thermostatic switch therein controlling the energization of the low voltage circuit with the low voltage AC current, a first relay unit having contacts in the high voltage circuit and controlling the energization of the igniter with the high voltage AC current, and another relay unit having contacts in the low voltage circuit and controlling the energization of the gas valve, the other relay unit comprising two separate relays respectively having contacts that are disposed in series in the low voltage circuit whereby the contacts of the two relays must be in the same condition thereof to energize the gas valve.

REFERENCES:
patent: 2800176 (1957-07-01), Morrison
patent: 4375951 (1983-03-01), Bohan
patent: 4643668 (1987-02-01), Geary

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