| Re: [GMCnet] GMC furnace [message #169262 is a reply to message #169193] |
Fri, 11 May 2012 14:36   |
Rick
Messages: 36
Registered: September 2010
Location: Ft. Worth
Karma:
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Thanks for all the recommendations!
I picked up a Suburban NT30SP today and look forward to making it fit. The project photos you linked are going to be a great help, some real creative ideas there.
Rick
On May 10, 2012, at 7:41 PM, Mike Miller <m000035@gmail.com> wrote:
>
>
> Rick wrote on Thu, 10 May 2012 11:52
>> I'm new to this forum and to the GMC so I hope this makes sense.
>> My new(old) '74 Painted Desert has a bad furnace (located under the kitchen sink).
>> I'm not sure what the brand or model it is, though I suspect it is a Suburban.
>> What brand and model would be the best replacement? And is there anything special required to compensate for the curved exterior wall. ...
>
>
> Welcome to the nut-house! :twisted:
>
> As you stated in another message, the Suburban "NT" models are almost direct replacements for the original furnace. The newer furnaces need some modifications to fit. BUT as the are a little smaller, so it is easier than it could be.
>
> As for BTU size, it has been argued that bigger is not always better due to furnace cycling issues. You might get better results with a smaller (BTU) model over a larger one... besides being cheaper to buy.
>
> Yes, there is "special requirement" to compensate for the curved exterior wall. The "NT" models are designed to be placed directly against the wall for cooling air-flow reasons. You can mount it on a slanted base (tilting it to match the wall) or put a metal "back" on the new furnace. (I understand Suburban makes a kit for this.) I have done it both ways and think the level mounting with metal back is the better way to go -- due to space usage and ease of furnace servicing. (I could NOT take my Birch's furnace out due to the tilted mounting.)
>
> If you do NOT tilt the furnace, make sure the final intake and exhaust tubes are long enough to make a good seal.
>
> Here are pictures:
>
> This is someone else's with a nice angled base (much better than mine):
> <http://www.gmcmhphotos.com/photos/g6020-suburban-furnace-replace.html>
>
> This is my '73 with a homemade metal back on a level base (You might notice that I am a wood butcher... and not a metal worker. But you get the idea...)
> <http://www.gmcmhphotos.com/photos/g3995-furnace.html>
>
> --
> Mike Miller -- Hillsboro, OR -- on the Black list
> (#1)'73 26' exPainted D. -- (#2)`78 23' Birchaven Rear Bath -- (#3)`77 23' Birchaven Side Bath
> http://m000035.blogspot.com
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Rick Does Ft. Worth Tx
1976 Glenbrook "Some Assembly Required"
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