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Home Repair - - If it ain't broken, don't fix it. Otherwise look here.
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Posted by Tom Lachance on October 10, 2006, 5:51 am
Can anyone give me some info on ODS pilots?
I need to know what the normal range of voltage the ODS puts out.
Normal thermocouples will hold a magnet in at about 20mv.
Can't get the one I checked to go higher than 10-15mv
Thanks
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Posted by HeatMan on October 10, 2006, 10:08 pm
First off, unvented heaters make people into Darwin award nominees (They
kill people).
> Can anyone give me some info on ODS pilots?
> I need to know what the normal range of voltage the ODS puts out.
> Normal thermocouples will hold a magnet in at about 20mv.
> Can't get the one I checked to go higher than 10-15mv
> Thanks
The t-couple on a ODS equipped heater is a standard one. The difference is
the orifice that leads to the actual pilot. The orifice actually is a
specific size that a certain amount of oxygen goes through to keep the pilot
burning. If the oxygen content drops too low, the pilot 'impinges' on the
t-couple less, effectively killing the power generation.
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Posted by on October 10, 2006, 11:36 pm
>First off, unvented heaters make people into Darwin award nominees (They
>kill people).
>
What kills more people, freezing to death/exposure, or unvented gas
heaters?
--
No dumb questions, just dumb answers.
Larry Wasserman - Baltimore, Maryland - lwasserm@charm.net
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Posted by Doug on October 11, 2006, 6:13 am
On Tue, 10 Oct 2006 22:08:15 -0400, "HeatMan"
>First off, unvented heaters make people into Darwin award nominees (They
>kill people).
Why do you say that?
Here in Connecticut there are thousands of unvented heaters in use.
They all have oxygen depletion shutdown systems and other safeties
that are reliable. They have UL and American Gas Association safety
ratings. The codes only prevent them from being used in enclosed
bedrooms, probably worrying about oxygen depletion.
The O2 sensors in ones that I've seen shut down the heater if the O2
is reduced from the nominal 22% in air to 19%.
Unvented gas fireplaces are also increasingly common.
Consumer reports did an analysis of them. The CO emissions were
miniscule. They did wonder a bit about the amount of water vapor
emitted into the air - possibly a problem for mold growth under
certain circumstances. Yet the addition of moisture in the air is
generally a good thing during winter.
I've not heard of a single death from one of these units.
I have heard of deaths from malfunctioning standard vented gas
furnaces, boilers and heaters.
Doug
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