Combustion – Timer – programmer – retarder or condition responsive control
Patent
1999-05-14
2000-07-18
Yeung, James C.
Combustion
Timer, programmer, retarder or condition responsive control
431 70, 431 75, 431266, F23N 500
Patent
active
060898569
ABSTRACT:
A pilot burner assembly for a gas burning heater which has a pilot fuel supply pipe and a pilot burner head with an inner chamber defined by a generally continuous sidewall. The pilot burner head has a middle body region with a side port defining a channel passing through the sidewall which has a channel wall. An ignitor rod passes at least partially into the port and terminates at an ignitor tip which is adapted to provide electrical current between the ignitor tip and the sidewall to ignite a pilot flame. A boss is welded on the burner head and surrounds the port. An insulation sleeve is positioned within the boss and has a central aperture adapted to allow passage of the ignitor rod and maintain the ignitor rod in position. A pilot flame sensor is positioned adjacent the pilot burner head and adapted to indicate the ignited pilot flame to a computerized control means. The control means operates a pilot fuel supply valve and the ignitor rod to initiate spark at the ignitor tip and ignite the pilot fuel when the pilot flame is not indicated by the sensor. The control means is also adapted to operate the main valve solenoid to close the main valve when no pilot flame is detected, and optionally maintains the pilot valve open with electrical current of decreased voltage when the sensor indicates a pilot flame. The control means further has an on-demand toggle switch having a first position whereby the control means provides electrical current to open the pilot valve and current to the ignitor rod when the burner demand indicator indicates demand for the burner and the sensor indicates no pilot flame to provide on-demand pilot flame.
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Shafer Roger A.
Wolcott Christopher J.
Gas Electronics, Inc.
Yeung James C.
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