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Posted by dpb on November 4, 2009, 4:41 pm
DT wrote:
...
show/hide quoted text
> For starters, is the rerun air ducted, or is it an open return system?
More to the point might be are the hot air runs insulated and/or in
unheated spaces (like attic/crawlspace) or is there a break somewhere
(like a flexible boot at the plenum outlet?) or a closed internal damper
or, or, or, ...???
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Posted by Stormin Mormon on November 4, 2009, 6:32 pm
Would be interesting if the duct is broken some where, and
the suction from the return air is moving all the air. But,
he said the plenum doesn't warm up.
--
Christopher A. Young
Learn more about Jesus
www.lds.org
More to the point might be are the hot air runs insulated
and/or in
unheated spaces (like attic/crawlspace) or is there a break
somewhere
(like a flexible boot at the plenum outlet?) or a closed
internal damper
or, or, or, ...???
--
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Posted by mkirsch1 on November 4, 2009, 5:09 pm
show/hide quoted text
> In article
> mkirs...@rochester.rr.com says...
> >I'm tired of people telling me that there's nothing wrong with my
> >furnace. There is something wrong with my furnace.
> >It's a 10-year-old Amana 45,000 BTU, 80% efficient unit in a 1300
> >square foot ranch style house. This is my 4th winter in this house,
> >and I'm sick of being limited to one habitable room all winter.
> >The air coming out of the vents is cool, around 70 degreees according
> >to my thermometer. The exhaust to the chimney is smokin' hot. The
> >plenum does not get perceptibly warm.
> Boy, it sure doesn't seem right. I have a 10 year old, 80% efficient
> 60,000 btu Armstrong furnace for my 1500 sf house in northern Ohio. It
> puts out 115 degree air at the register closest to the furnace. The
> double walled flue is hot, but I can place my hand on it. The plenum is,
> of course, quite hot. I insulated it with high temperature fiberglass.
> The house is well insulated with ducted returns and easily heats all
> rooms over 70 degrees in 15 below zero weather, and only runs about half
> the time under those conditions.
> For starters, is the rerun air ducted, or is it an open return system?
The return air is ducted.
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Posted by Jules on November 4, 2009, 4:40 pm
On Wed, 04 Nov 2009 12:20:37 -0800, mkirsch1 wrote:
show/hide quoted text
> The air coming out of the vents is cool, around 70 degreees according
> to my thermometer. The exhaust to the chimney is smokin' hot. The
> plenum does not get perceptibly warm.
Can you get a thermometer into the plenum at all and check there (or at
least whatever register's closest to the plenum)? Our system loses an
insane amount of heat in the ductwork and there's about 40 degrees
difference between the register nearest the furnace and the one furthest
away (I did post actual numbers the other week, but can't remember what
thread that was in, and I don't have them written down)
Never tested the exhaust temp on ours. Maybe they always run hot at that
point.
Just wondering if your problem's the furnace or the ductwork...
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Posted by mkirsch1 on November 4, 2009, 5:05 pm
wrote:
show/hide quoted text
> On Wed, 04 Nov 2009 12:20:37 -0800, mkirsch1 wrote:
> > The air coming out of the vents is cool, around 70 degreees according
> > to my thermometer. The exhaust to the chimney is smokin' hot. The
> > plenum does not get perceptibly warm.
> Can you get a thermometer into the plenum at all and check there (or at
> least whatever register's closest to the plenum)? Our system loses an
> insane amount of heat in the ductwork and there's about 40 degrees
> difference between the register nearest the furnace and the one furthest
> away (I did post actual numbers the other week, but can't remember what
> thread that was in, and I don't have them written down)
> Never tested the exhaust temp on ours. Maybe they always run hot at that
> point.
> Just wondering if your problem's the furnace or the ductwork...
I used an infrared thermometer on the vent near the middle of a
heating cycle when the air coming out felt the warmest. The
temperature was in the low 70's.
Ductwork is all uninsulated in a full basement.
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