Running My Hot Air Into My Cold Air Oil Furnace?

 
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Lightning
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Post by Lightning » Sat. Jul. 26, 2014 6:21 pm

hotblast1357 wrote:Ok, all I would need to try it with my oil plenum fan is just 2 more 8 inch nipple and a piece of 8 inch duct work to go straight up to the cold air return, maybe it would be better if I got rid of the 8 inch pipes and just had a sheet metal fabricator make me a big box tieing the two?
You could do your own tin work. Measure the distance between the two 8 inch round holes in the top of the furnace to find a width that will cover both of them completely. Use rectangular trunk ducting, possibly 12x20 inches or 8x20, maybe 12x16 or 8x16 would even cover it. Run it straight up to the return on your oil burner like you suggested. You will need to open up the back of the coal furnace more where the blower is so more volume can get thru it. For now just pull off the blower. I'm not sure what you can do to tell the oil burner blower to run.. :? That would be the only dilemma.. You'd also need to block some or maybe all of the oil burner's cold air return so that it would pull air from the new pathway (coal furnace) instead of the cold air returns. I'm guessing you would still want the oil burner to fire if needed.. You would have to keep that in mind so you can make modifications that would still allow it to do so.

 
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hotblast1357
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Post by hotblast1357 » Sat. Jul. 26, 2014 7:41 pm

Well my oil furnace only has 1 cold air and that's the one, the only thing I'm worried about now is.. If I have the smallest crack in my stove body, the oil fan would end up sucking it out the crack over powering my draft correct? Causing a BIG PROBLEM. I guess I could do the extreme and just take my blower out of my oil furnace and install it into my coal furnace and still run the heat duct through the cold air? But I almost think it would cool it off to quick causing it to cycle a lot

 
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Lightning
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Post by Lightning » Sat. Jul. 26, 2014 8:14 pm

hotblast1357 wrote: If I have the smallest crack in my stove body, the oil fan would end up sucking it out the crack over powering my draft correct? Causing a BIG PROBLEM.
That is correctly since the oil blower would be applying negative pressure to the coal furnace.. Yes the pulling of the oil blower would be hundreds of times stronger than the weak (relatively speaking) natural draft of a chimney.. I never considered that. Good call! But I wouldn't expect a leak in the firebox either, but anything is possible..
hotblast1357 wrote: I guess I could do the extreme and just take my blower out of my oil furnace and install it into my coal furnace and still run the heat duct through the cold air?
This would be an option too, or like another poster advised, find another one cheap.


 
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hotblast1357
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Post by hotblast1357 » Sat. Jul. 26, 2014 8:18 pm

Ya.. Maybe I'll just find a lil bigger fan

 
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michaelanthony
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Post by michaelanthony » Sat. Jul. 26, 2014 11:37 pm

[quote="hotblast1357"]Well my oil furnace only has 1 cold air and that's the one, the only thing I'm worried about now is.. If I have the smallest crack in my stove body, the oil fan would end up sucking it out the crack over powering my draft correct? Causing a BIG PROBLEM. I guess I could do the extreme and just take my blower out of my oil furnace and install it into my coal furnace and still run the heat duct through the cold air? But I almost think it would cool it off to quick causing it to cycle a lot[/quote]

(1) Have C.O.detector---check
(2) Have manometer---check
(3) Am I over thinking this---check

!00% of us are screwed if we have a crack in the fire box, that is why we have 1 and 2. Start with the least expensive option and give it a try.......in 3 months! now go enjoy the rest of the summer :D

 
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hotblast1357
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Other Heating: air source heat pump, oil furnace

Post by hotblast1357 » Sun. Jul. 27, 2014 8:54 am

Lol I have 1 & 2, check! 3 well that's what I do lol and ya I am trying to enjoy my summer, its just hard to wait cuz all of these mods I can't do when it running

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