Posted by oldgearhead on 06/28/2017 6:56 AM
#6
..exactly! In my roaster the re-cycled air increases rate-of-rise about 3-4 ?F, until about the 9 minute point of each roast then it reduces to 2 ?F until the roast's end (usually 12 minutes). The ROR is further fine-tuned by the blower speed. Heater % output is NOT changed. It is set based on the present ambient temperature and the size of the load.
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We may be kindred spirits OGH! The FB roaster I've recently finished does this exact same thing... I think.
I turn my blower on and I turn my heating element on and the only control over the roast is airflow via the blower. My roaster is pretty efficient in reclaiming hot air and recirculating it so the temp is always increasing throughout the roast. I can't (chose not to) cycle the heat source on/off - it just turns on and keeps getting hotter as the air is recirculated. Is that what you're talking about?