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Iced Furnance Air Intake MC 09-03-2007
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Posted by MC on September 3, 2007, 2:37 pm
Dear All,

Outside winter temperature often reached -30 C. The fresh air intake iced up
resulting in furnace shut down. The furnace is 1 year old, high efficiency,
forced air furnace.

The intake is a 2.5" OD black PVC pipe.

The cloth dryer's exhaust vent is about 6' below and 3' displaced from the
furnace air intake.

Other than moving the clothing exhaust vent elsewhere, any suggestion to
avoid having to remove the loose ice from the air intake?

No problem when the cloth dryer is not running.

Thanks,
MC






Posted by CWatters on September 3, 2007, 5:24 pm

> Dear All,
>
> Outside winter temperature often reached -30 C. The fresh air intake iced
up
> resulting in furnace shut down. The furnace is 1 year old, high
efficiency,
> forced air furnace.
>
> The intake is a 2.5" OD black PVC pipe.
>
> The cloth dryer's exhaust vent is about 6' below and 3' displaced from the
> furnace air intake.
>
> Other than moving the clothing exhaust vent elsewhere, any suggestion to
> avoid having to remove the loose ice from the air intake?
>
> No problem when the cloth dryer is not running.

Heat it? You can get electrical pipe heating tape to prevent outside pipes
freezing...
http://www.doityourself.com/invt/1462068
... but I don't know if they are powerful enough.
...check it's rated for outdoor/wet use



Posted by PeterD on September 4, 2007, 9:20 am
On Mon, 3 Sep 2007 22:24:41 +0100, "CWatters"

>
>> Dear All,
>>
>> Outside winter temperature often reached -30 C. The fresh air intake iced
>up
>> resulting in furnace shut down. The furnace is 1 year old, high
>efficiency,
>> forced air furnace.
>>
>> The intake is a 2.5" OD black PVC pipe.
>>
>> The cloth dryer's exhaust vent is about 6' below and 3' displaced from the
>> furnace air intake.
>>
>> Other than moving the clothing exhaust vent elsewhere, any suggestion to
>> avoid having to remove the loose ice from the air intake?
>>
>> No problem when the cloth dryer is not running.
>
>Heat it? You can get electrical pipe heating tape to prevent outside pipes
>freezing...
>http://www.doityourself.com/invt/1462068
>... but I don't know if they are powerful enough.
>...check it's rated for outdoor/wet use
>

I'd be reluctant to recommend that as the pipe is PVC, and that may
present a safety problem.

Posted by CWatters on September 5, 2007, 7:35 am

> I'd be reluctant to recommend that as the pipe is PVC, and that may
> present a safety problem.

Possibly but I don't think the heating tapes get that hot. Would have to try
it I guess.



Posted by PeterD on September 4, 2007, 9:19 am

>Dear All,
>
>Outside winter temperature often reached -30 C. The fresh air intake iced up
>resulting in furnace shut down. The furnace is 1 year old, high efficiency,
>forced air furnace.
>
>The intake is a 2.5" OD black PVC pipe.
>
>The cloth dryer's exhaust vent is about 6' below and 3' displaced from the
>furnace air intake.
>
>Other than moving the clothing exhaust vent elsewhere, any suggestion to
>avoid having to remove the loose ice from the air intake?
>
>No problem when the cloth dryer is not running.
>
>Thanks,
>MC
>
>
My first thought is that you should consider whether it is possible to
recycle the dryer exhaust and use that heat (and moisture) in the
building...

Other than that, extend the dryer exhaust above the furnace intake, or
more the furnace intake down below the drier?

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