Combustion – Timer – programmer – retarder or condition responsive control – Sensor of first burner controls second burner – e.g. – pilot...
Patent
1990-11-21
1992-07-07
Yeung, James C.
Combustion
Timer, programmer, retarder or condition responsive control
Sensor of first burner controls second burner, e.g., pilot...
431 60, 431 75, F23Q 908
Patent
active
051278235
ABSTRACT:
A control system for a gas furnace, control device therefor and methods of making the same are provided, the system comprising an electrical circuit that has a metal oxide varistor therein that is adapted to interconnect one end of a secondary winding of a transformer to frame ground only after the potential for sparking is reached at an igniter that is interconnected to the other end of the secondary winding and causes the varistor to break over and cause the igniter to spark.
REFERENCES:
patent: 4455589 (1984-06-01), Riordan et al.
patent: 4842510 (1989-06-01), Grunden et al.
patent: 4865539 (1989-09-01), Geary
patent: 4915614 (1990-04-01), Geary
patent: 4978292 (1990-12-01), Donnelly
Robertshaw Controls Company
Yeung James C.
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