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cody69 02-16-2011 06:29 PM

Intermittent pilot spark ignition question

I got a question about the sequence of operation for an intermittent pilot spark ignition furnace. Does the igniter continue to spark and does the pilot remain lit after the burners have fired up. Thanks!

yuri 02-16-2011 06:56 PM

Spark shuts off but pilot stays on. Post brand and model # for more info if needed.

Marty S. 02-16-2011 06:56 PM

The ones I'm used to stop sparking and the pilot stays lit.

cody69 02-16-2011 07:19 PM

Thanks. It's difficult to hear the if the igniter is still sparking and see the pilot flame with the inducer and burners on. But why does the system shut down once I pulled off the spark cable if the spark has shut off after the ignition sequence is approved? The spark cable needs to be connected to keep the pilot going? By the way, this is for a York furnace with a Honeywell s8600H ignition module.

yuri 02-16-2011 08:21 PM

The spark electrode is live with AC voltage which needs to pass thru the flame and be converted to DC and pass a DC microamp signal thru the pilot burner/curved hood on it/ground strap back to the circuit board to prove there is a flame. Removing the cable breaks that circuit. Once it initially gets a DC signal it stops the spark.

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