Primary control system for furnaces and method of making the sam

Details Primary control system for furnaces and method of making the sam Primary control system for furnaces and method of making the sam

1975-06-18

1977-01-18

Envall, Jr., R. N.

H01H 4700

Patent

active

040041980

ABSTRACT:
An electrical primary control system for furnaces and method of making the same, the system comprising burner control means, an isolated low voltage control circuit and means for interfacing between the isolated low voltage control circuit and the burner control means; the interfacing means including a pair of resilient, magnetic reeds disposed within a hermetically sealed envelope, and a pair of electrically insulated independently wound coils having a differential in ampere turns and encompassing the envelope, the magnetic flux generated by such coils being additive whereby energization of both of the coils is required to close the contacts but energization of one of the coils is sufficient to maintain the contacts closed, at least one of the coils having a resistance wire of predetermined calibrated resistance electrically connected in parallel circuit therewith.

REFERENCES:
patent: 3256425 (1966-06-01), Deeg
patent: 3325695 (1967-06-01), Brunette et al.
patent: 3579041 (1971-05-01), Paine

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