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)

Normal. And very common. Your #2 looked close, but I didn't
read closely. Nothing to be concerned about as long as the temps
remain comfortable in your house.

Please post in "text only" mode. HTML draws flames a lot of
times; posts get garbaged on many readers.

HTH,

Pop


"z" wrote in message
oups.com...
: 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)
:

Sounds like your limit could use some adjusting. It won't hurt anything as
is but shouldn't really run that way....

Nice furnace, BTW......


"z" wrote in message
oups.com...
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)

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

"z" wrote in message
oups.com...
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)


Its common, not correct however.
the limits off temps too high.

Pop wrote:
Normal. And very common. Your #2 looked close, but I didn't
read closely. Nothing to be concerned about as long as the temps
remain comfortable in your house.

Please post in "text only" mode. HTML draws flames a lot of
times; posts get garbaged on many readers.

Thanks.
(it should be in text; I'm posting via google groups and they're text
only. ??)

the fan "off" temp needs to be lowered but do not lower it
below 98.6 as that is body temp and any thing lower below
that will fee cold or cool.
"z" wrote in message
oups.com..
..

Pop wrote:
Normal. And very common. Your #2 looked close, but I
didn't
read closely. Nothing to be concerned about as long as
the temps
remain comfortable in your house.

Please post in "text only" mode. HTML draws flames a lot
of
times; posts get garbaged on many readers.

Thanks.
(it should be in text; I'm posting via google groups and
they're text
only. ??)