On 16 Dec 2005 11:29:31 -0800, "z" wrote:

Got a new thermopride oil burning hot air furnace a few months ago.
What I'm wondering about is...
after the thermostat shuts off and the burner shuts off and the blower
shuts off, ten or 15 minutes later the blower comes on again for maybe
a minute with no burner, then shuts down again. Is this normal? Is this
good, bad, or indifferent?
I have two random hypotheses:
1 is that it is deliberate in order to scavenge that last few btus of
retained heat that would otherwise be wasted;
2 is that in the absence of cooling by the blower the residual
heat-soak is pushing the temp at the thermal switch up to the point
where it gets hot enough to turn the blower on again for a while. (I
know it sounds weird, but if the thermal switch isn't that closely tied
to the hottest part of the thing it could happen; like with some cars
where you get off the highway and immediately turn it off, and in the
absence of the highway airflow cooling the radiator the residual engine
heat soaking into the coolant gets the water temp up to where the
thermal switch turns the electric fan on after a minute)

The fan side of your fan & limit control needs to have the "off"
setting lowered just a bit.
Bubba