Electrical transmission or interconnection systems – Switching systems – Condition responsive
Patent
1975-02-07
1977-05-17
Schaefer, Robert K.
Electrical transmission or interconnection systems
Switching systems
Condition responsive
431 79, H01H 3700
Patent
active
040244121
ABSTRACT:
A primary side of a burner control circuit includes a triac switch for applying a line voltage to a burner motor and an igniter in response to a signal from a first optical coupler, and a circuit breaker responsive to a second optical coupler for disconnecting the primary from the line voltage. A low voltage or secondary side of the control circuit, which is responsive to a thermostat, contains a light sensitive element for detecting a flame at the burner and the light sources for both optical couplers and, as such, is effective to control both the triac and the circuit breaker. The secondary also contains an electrical timing circuit for causing the triac to shut the motor and igniter off when, a predetermined time after a call for heat by the thermostat has elapsed, a flame has not been detected in the furnace. In addition, the burner control circuit includes a fail-safe capability for opening the circuit breaker if the triac has failed into a permanently closed condition and there is no call for heat or the burner flame has gone out; thereby preventing the system from overheating or filling with fuel.
REFERENCES:
patent: 3732433 (1973-05-01), Lourigan
patent: 3770365 (1973-11-01), Lenski
patent: 3829276 (1974-08-01), Lenski et al.
Ginsburg Morris
Schaefer Robert K.
The Scott & Fetzer Company (France Division)
LandOfFree
Burner control system with primary safety switch does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Burner control system with primary safety switch, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Burner control system with primary safety switch will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1836732