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Posted by Jules on November 2, 2009, 6:14 pm
On Mon, 02 Nov 2009 14:28:53 -0800, Bob F wrote:
> Jules wrote:
>
>> Ours currently vents outside at about 3' off the ground via a
>> 90-degree elbow which keeps moisture out, although I think according
>> to building codes (we don't really have any where I am) it's supposed
>> to vent at roof height (which seems like common sense anyway - I'll
>> fix ours sometime)
>
> That's certainly not true here in Seattle. There do have to be certain
> clearances from openable windows, doors, or air intakes.
Yeah, I'm not surprised (I remember our home inspector did flag it when
we bought the place, too).
The other thing is that our furnace currently sources intake air from very
close to the exhaust outlet, which seems like a pretty bad idea to me. I'm
curious to know what codes in areas that have them say about that as
presumably there are recommended minimum distances (I can re-route one or
the other through the basement easily enough, but maybe I'm better off
taking the exhaust up to roof height and leaving the air intake at waist
height outside - then they have a reasonable separation but without any
basement changes). Reasonably quick/easy/cheap project, anyway...
Oh, ours is all on 2" pipe, just to add to comments for the OP.
cheers
Jules
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Posted by Bob F on November 2, 2009, 6:28 pm
Jules wrote:
> On Mon, 02 Nov 2009 14:28:53 -0800, Bob F wrote:
>> Jules wrote:
>>> Ours currently vents outside at about 3' off the ground via a
>>> 90-degree elbow which keeps moisture out, although I think according
>>> to building codes (we don't really have any where I am) it's
>>> supposed to vent at roof height (which seems like common sense
>>> anyway - I'll fix ours sometime)
>> That's certainly not true here in Seattle. There do have to be
>> certain clearances from openable windows, doors, or air intakes.
> Yeah, I'm not surprised (I remember our home inspector did flag it
> when we bought the place, too).
> The other thing is that our furnace currently sources intake air from
> very close to the exhaust outlet, which seems like a pretty bad idea
> to me. I'm curious to know what codes in areas that have them say
> about that as presumably there are recommended minimum distances (I
> can re-route one or the other through the basement easily enough, but
> maybe I'm better off taking the exhaust up to roof height and leaving
> the air intake at waist height outside - then they have a reasonable
> separation but without any basement changes). Reasonably
> quick/easy/cheap project, anyway...
I suspect that the furnace intake is not an issue, because the exhaust is
usually directed away from it, and there is no path that would allow intaken CO
to get into the living space. It would just go through the furnace and back out.
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Posted by Stormin Mormon on November 2, 2009, 7:34 am
Typically 2 or 3 inch diameter. The pipe should slope back
towards the furnace, and there should be a drain to drain
off the water. It's normal and expected for these furnaces
to drain off a bunch of water while running. It's also
expected to get some water in the exhaust pipe.
--
Christopher A. Young
Learn more about Jesus
www.lds.org
.
My furnace stopped working, it had some read-outs saying the
exhaust
was not working.
Turns out the exhaust pipe was full of water and filled the
exhaust
fan with water.
I cleaned all of this out, but now I want to correct the
problem.
My exhaust PVC travels from the furnace to the outside wall.
There is
a belly in this pipe. Thats were the water was sitting.
Looks like I need to have it angled to drain back to the
furnace - I
need to correct the belly.
Is there a standard size for this type of pipe? Mine looks
to be 3"
dia. Rather large.
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Posted by Art Todesco on November 2, 2009, 7:41 am
theedudenator wrote:
> My furnace stopped working, it had some read-outs saying the exhaust
> was not working.
> Turns out the exhaust pipe was full of water and filled the exhaust
> fan with water.
> I cleaned all of this out, but now I want to correct the problem.
>
> My exhaust PVC travels from the furnace to the outside wall. There is
> a belly in this pipe. Thats were the water was sitting.
>
> Looks like I need to have it angled to drain back to the furnace - I
> need to correct the belly.
> Is there a standard size for this type of pipe? Mine looks to be 3"
> dia. Rather large.
My old Amana (1990s) used 2" all the way
out, however, newer ones
seem to have outputs of 2" or so, but
immediately up to 3". As to sloping
in or out, most seem to say that they
should slope in so the water doesn't
end up on the ground. In order to block
a 3" horizontal run, there must
be a lot of sag. But, if there is water
sloshing in the combustion fan, it
may not be the sloping (unless it is
really bad) causing the problem. In
my Amana, after about a year of use, the
drains would get plugged by
slime build up. When I removed the
drain from the fan, a whole lot of
water would come out. There was also a
drain on the secondary heat
exchanger. Its line would also get
slime balls in it and would require
periodic cleaning. A small bottle brush
with a long handle came in very
handy.
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Posted by Retirednoguilt on November 2, 2009, 3:02 pm
theedudenator wrote:
> My furnace stopped working, it had some read-outs saying the exhaust
> was not working.
> Turns out the exhaust pipe was full of water and filled the exhaust
> fan with water.
> I cleaned all of this out, but now I want to correct the problem.
>
> My exhaust PVC travels from the furnace to the outside wall. There is
> a belly in this pipe. Thats were the water was sitting.
>
> Looks like I need to have it angled to drain back to the furnace - I
> need to correct the belly.
> Is there a standard size for this type of pipe? Mine looks to be 3"
> dia. Rather large.
I live in Maryland and had a Carrier 92% efficient gas furnace installed
compliant with our codes 3 years ago. My exhaust PVC is supported by hangers in
the basement and slopes gently back towards the furnace so condensate will drain
back into the furnace as it should. Outside the penetration through the
foundation, they installed a 90 degree elbow facing up to the sky, with about a
2 foot length of straight PVC pipe in the open end of the elbow. Then, there is
a 180 degree elbow connected to that. This way, rain etc. does not enter the
pipe.
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