Method of and system for flame sensing and diagnostic

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United States of America Patent

PATENT NO 9803889
SERIAL NO

15015600

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Abstract

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A method of determining presence of a flame in a furnace of a heating, ventilation, and air conditioning (HVAC) system. The method comprises determining, using a controller, whether a processor signal (G) is active, responsive to a determination that the processor signal (G) is active, determining, using the controller prior to assertion of a flame-test input control signal, an output state of a first comparator, responsive to a determination that the output state of the first comparator is high, determining, using the controller prior to assertion of the flame-test input control signal, an output state of a second comparator, and responsive to a determination that the output state of the second comparator is low, transmitting, using the controller, a notification that a flame is present.

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Patent Owner(s)

Patent OwnerAddress
LENNOX INDUSTRIES INC2140 LAKE PARK BLVD RICHARDSON TX 75080

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Engler, Michael Lucas, US 22 427

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