More gas furnace questions Coleman Model 7970-656/d

Posted by Tony on November 8, 2009, 11:40 am

Bob F wrote:

> Tony wrote:

>> Bob F wrote:

>>> Tony wrote:
>>>> Again, this is a down flow furnace out of a mobile home. Just
>>>> noticed it says "Sealed Combustion" and my insurance company said
>>>> it's OK for me to use it in my garage. Down flow, so I'll weld a
>>>> stand for it to sit up off the floor about 8".
>>>> Question about flue exhaust and fresh air inlet. This is an 80%
>>>> unit (I'm guessing 57K BTU's out divided by 70K BTU's in = 81%? )
>>>> Can this be used with the flue exhaust/air intake being terminated
>>>> on an outside wall similar to 90% units but metal, not PVC? Or must
>>>> this flue go a certain number of feet higher than the roof? Or
>>>> something in between the two?
>>> Best bet. Contact the manufacturer to get a copy of the installation
>>> manual for that furnace.

>> I've been trying to do that with no success.

>
> Have you tried the phone # on http://www.colemanac.com/site_map.asp?

Thanks. I tried one number but couldn't get through. Try again on Monday.

Posted by Joe on November 7, 2009, 1:57 pm

> Again, this is a down flow furnace out of a mobile home. =A0Just noticed
> it says "Sealed Combustion" and my insurance company said it's OK for me
> to use it in my garage. =A0Down flow, so I'll weld a stand for it to sit
> up off the floor about 8".
> Question about flue exhaust and fresh air inlet. =A0This is an 80% unit
> (I'm guessing 57K BTU's out divided by 70K BTU's in =3D 81%? )
> Can this be used with the flue exhaust/air intake being terminated on an
> outside wall similar to 90% units but metal, not PVC? =A0Or must this flu=

> go a certain number of feet higher than the roof? =A0Or something in
> between the two?

What does your building code require? A code compliant installation
will make your insurance company happy.

Joe

Posted by Tony on November 7, 2009, 2:28 pm

Joe wrote:

>> Again, this is a down flow furnace out of a mobile home. Just noticed
>> it says "Sealed Combustion" and my insurance company said it's OK for me
>> to use it in my garage. Down flow, so I'll weld a stand for it to sit
>> up off the floor about 8".
>> Question about flue exhaust and fresh air inlet. This is an 80% unit
>> (I'm guessing 57K BTU's out divided by 70K BTU's in = 81%? )
>> Can this be used with the flue exhaust/air intake being terminated on an
>> outside wall similar to 90% units but metal, not PVC? Or must this flue
>> go a certain number of feet higher than the roof? Or something in
>> between the two?

>
> What does your building code require? A code compliant installation
> will make your insurance company happy.

I forgot to mention there is _NO_ building code where I live. We have
septic and electrical codes/inspection but no building code.

Posted by Lefty on November 7, 2009, 4:06 pm

> Again, this is a down flow furnace out of a mobile home. Just noticed it
> says "Sealed Combustion" and my insurance company said it's OK for me to
> use it in my garage. Down flow, so I'll weld a stand for it to sit up off
> the floor about 8".
> Question about flue exhaust and fresh air inlet. This is an 80% unit (I'm
> guessing 57K BTU's out divided by 70K BTU's in = 81%? )
> Can this be used with the flue exhaust/air intake being terminated on an
> outside wall similar to 90% units but metal, not PVC? Or must this flue
> go a certain number of feet higher than the roof? Or something in between
> the two?

Normally mobile home means "direct vent" with sealed combustion. This means
a specialized vertical vent termination would be the only one you could use.
I see manuals you can "buy" online; such as this one;

http://www.hvacmanuals.com/detailed_manual.php?manuals_id=34

but I would think that there would something in the way of "free" from the
mfg. somewhere.

You may want to try these folks, because they surely know all about that
unit;

http://www.stylecrestproducts.com/htdocs/contact.cfm

You may have to call or e-mail, but I'm not sure they will help an
individual for retail sale, as they are wholesale suppliers to the mobile
home industry.

If you are going to have to wing-it all alone, you may want to try a gas
fireplace vent kit and termination. But that may be quite risky, both for
safety and functionality.

HTH, Lefty

Posted by Lefty on November 7, 2009, 4:10 pm

>> Again, this is a down flow furnace out of a mobile home. Just noticed it
>> says "Sealed Combustion" and my insurance company said it's OK for me to
>> use it in my garage. Down flow, so I'll weld a stand for it to sit up
>> off the floor about 8".
>> Question about flue exhaust and fresh air inlet. This is an 80% unit
>> (I'm guessing 57K BTU's out divided by 70K BTU's in = 81%? )
>> Can this be used with the flue exhaust/air intake being terminated on an
>> outside wall similar to 90% units but metal, not PVC? Or must this flue
>> go a certain number of feet higher than the roof? Or something in
>> between the two?

> Normally mobile home means "direct vent" with sealed combustion. This
> means a specialized vertical vent termination would be the only one you
> could use. I see manuals you can "buy" online; such as this one;
> http://www.hvacmanuals.com/detailed_manual.php?manuals_id=34
> but I would think that there would something in the way of "free" from the
> mfg. somewhere.
> You may want to try these folks, because they surely know all about that
> unit;
> http://www.stylecrestproducts.com/htdocs/contact.cfm
> You may have to call or e-mail, but I'm not sure they will help an
> individual for retail sale, as they are wholesale suppliers to the mobile
> home industry.
> If you are going to have to wing-it all alone, you may want to try a gas
> fireplace vent kit and termination. But that may be quite risky, both for
> safety and functionality.
> HTH, Lefty

This may give you a little more insight;

http://www.stylecrestproducts.com/htdocs/pdf_catalog/09_HeatAir09.pdf

HTH, Lefty

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